High pressure straight-through plunger type throttle valve

Abstract

The application discloses a high-pressure straight-through type plunger throttle valve and particularly relates to the technical field of throttle valves, which comprises a valve body, a plunger rod, a limiting fixer and a through-flow seat. A straight-flow channel is arranged in the valve body, and a plunger rod mounting hole is further arranged in the valve body. The plunger rod is rotatably mounted in the plunger rod mounting hole. The limiting fixer is detachably mounted on the valve body at a position corresponding to the top end of the plunger rod. A passage hole is arranged in the bottom end of the plunger rod, and the through-flow seat is detachably mounted in the passage hole. A through-opening sealing ring is arranged on the outer surface of the plunger rod at positions corresponding to the inlet end and the outlet end of the through-flow seat. The valve body adopts a passage straight-through type structure, which reduces the energy consumption loss of the equipment, does not need to change the direction of the medium flow channel, occupies a small space of a well site, solves the layout problem, reduces the additional equipment brought by an angular type fixed throttle valve, lowers the cost and is more convenient to disassemble and assemble.

Description

Technical Field

[0001] This invention relates to the field of throttle valve technology, and more specifically, to a high-pressure straight-through plunger-type throttle valve. Background Technology

[0002] In oil and gas extraction, fixed throttle valves are used to control fluid flow and pressure, ensuring safe, stable, and efficient production. Currently, most throttle valves used are angle-type fixed throttle valves, meaning the valve inlet centerline and outlet centerline form a 90° angle. These angle-type fixed throttle valves alter the direction of the medium flow path and occupy more space. Given the increasing number of well site equipment, straight-through fixed throttle valves are receiving more attention.

[0003] When replacing internal components of existing angle-type fixed throttle valves, the throttle valve cover must first be removed before tools can be used to remove the internal components and replace the throttle valve seat assembly inside the valve body. This process is prone to scratching the corresponding sealing structure during installation, leading to leakage. The replacement steps are relatively complicated, the operating space is small, and it is easy to damage the internal parts of the valve. This process is time-consuming and labor-intensive. Under high-pressure conditions, it may even be necessary to replace the entire valve. Summary of the Invention

[0004] The present invention provides a high-pressure straight-through plunger-type throttle valve, which aims to solve the problem that: when replacing internal components of existing angle-type fixed throttle valves, the replacement steps are relatively complicated, the operating space is small, and damage to internal valve parts is easy to occur, which is time-consuming and labor-intensive.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-pressure straight-through plunger-type throttle valve, comprising a valve body, a plunger rod, a limit retainer, and a flow seat. The valve body has a direct-flow channel inside and a plunger rod mounting hole inside. The plunger rod is rotatably mounted in the plunger rod mounting hole, and a limit ring is provided on the outer side of the plunger rod's top end. A limit retainer is detachably mounted on the valve body at the position corresponding to the top end of the plunger rod. A channel hole is provided inside the bottom end of the plunger rod, and the flow seat is detachably mounted in the channel hole. A through-hole sealing ring is provided on the outer surface of the plunger rod at the area corresponding to the inlet and outlet ends of the flow seat. A pressure-reducing chamber is provided in the valve body, and a sealing plug is installed inside the pressure-reducing chamber. A hollow elastic element is fixedly mounted on one side of the sealing plug corresponding to the flow seat. The pressure-reducing chamber is connected to the plunger rod mounting hole and the gap between the plunger rod and the plunger rod through a connecting hole.

[0006] Preferably, the middle region of the plunger rod is provided with a tapered step, and the plunger rod mounting hole is provided with a structure that cooperates with the tapered step at the position corresponding to the tapered step. An upper sealing ring assembly is provided between the top region of the plunger rod and the plunger rod mounting hole, and a lower sealing ring assembly is provided between the bottom region of the plunger rod and the plunger rod mounting hole. A locking mounting groove is provided on the outer surface of the plunger rod at the region corresponding to the inlet and outlet ends of the flow seat, and the flow port sealing ring is installed in the locking mounting groove.

[0007] Preferably, the pressure relief chamber is connected to a pressure boosting component, which is used to increase the fluid pressure in the gap between the plunger rod mounting hole and the plunger rod when the throttle valve is open, so that the fluid flows from the gap between the plunger rod mounting hole and the plunger rod into the direct flow channel of the valve body.

[0008] Preferably, the booster assembly is a linked booster structure, which includes a first piston rod, a first piston hole inside the valve body, the first piston hole communicating with a connecting hole, the first piston rod being slidably mounted on the top region of the first piston hole, a first movable block being fixedly connected to the top of the first piston rod, the first movable block being slidably adapted to the bottom wall of a limiting protrusion ring, a long protrusion being fixedly connected to the bottom of the limiting protrusion ring, the long protrusion being slidably adapted to the first movable block, and an elastic element being provided between the first piston rod and the first piston hole, the elastic element being used to provide an upward elastic force to the first piston rod.

[0009] Preferably, the pressurization component is an automatic pressurization structure, which includes a pressure controller, a threaded column and a motor, and a sealing plug that is slidably installed in the pressure relief chamber. The threaded column is fixedly connected to the sealing plug, the threaded column is threadedly installed in the valve body, the motor is fixedly installed on the valve body, and the output shaft of the motor is slidably inserted into the threaded column via a sliding key.

[0010] Preferably, a shock-absorbing inner bushing is provided on the inner wall of the region near the inlet end of the flow seat's through-hole. The shock-absorbing inner bushing is a hollow elastic structure, and the connecting hole is provided in correspondence with the internal through-hole of the flow seat.

[0011] Preferably, the plunger rod has a second piston hole inside, and the second piston hole and the engagement mounting groove are filled with hydraulic fluid. The second piston hole communicates with the engagement mounting groove, and the through-hole sealing ring is slidably installed in the engagement mounting groove. A second piston column is slidably installed at the top of the second piston hole, and a second movable block is fixedly connected to the second piston column. An elastic element is provided between the second piston column and the plunger rod. This elastic element is used to provide an upward elastic force to the second movable block. A short protrusion is provided on the mating surface of the limiting retainer and the top wall of the limiting convex ring. When the short protrusion contacts the second movable block, it forms a downward compression on the second movable block.

[0012] Preferably, a pressure relief component is provided on the side wall of the valve body near the inlet end, a limit post is provided in the valve body at the position corresponding to the bottom end of the plunger rod, and the bottom end of the plunger rod is provided with an insertion hole for rotatably inserting with the limit post.

[0013] Preferably, the valve body is provided with a threaded structure that cooperates with the limit retainer. The limit retainer is installed on the valve body through the threaded structure. The inside of the channel hole is provided with a threaded structure. The flow seat is installed with the channel hole through the threaded structure. The inlet end of the flow seat is provided with a raised step structure. A mating sealing ring and a gasket are provided between the raised step structure and the channel hole.

[0014] Preferably, the inlet and outlet sealing rings of the flow seat are provided with two sets, and the two sets of inlet sealing rings are distributed in an inner and outer ring manner. Both the upper sealing ring assembly and the lower sealing ring assembly are composed of sealing rings and retaining rings.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The valve body of this invention adopts a straight-through structure, which reduces equipment energy consumption loss, eliminates the need to change the direction of the medium flow channel, occupies little well site space, solves layout problems, and reduces the additional equipment required by angle-fixed throttle valves, thus reducing costs. The direct threaded connection of the limit fixer makes disassembly and assembly more convenient. Furthermore, the flow seat and plunger rod are combined, so when the flow seat needs to be replaced, only the plunger rod and flow seat need to be removed from the valve body for replacement, or only the channel hole of different sized diameter hole needs to be replaced, saving time and effort.

[0017] 2. In addition to the upper and lower sealing ring assemblies, the present invention provides a port sealing ring in the vicinity of the inlet and outlet ends of the plunger rod corresponding to the flow seat, which effectively enhances the sealing capability of the medium. Furthermore, by replacing the port sealing ring, upper sealing ring assembly, and lower sealing ring assembly with different materials, it can be applied to different acidic working conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the throttle valve of the present invention.

[0019] Figure 2 This is a cross-sectional view of the throttle valve of the present invention.

[0020] Figure 3 This is a schematic diagram of the flow seat in the plunger rod of the present invention.

[0021] Figure 4 For the present invention Figure 2 Enlarged view of the structure of part A.

[0022] Figure 5 For the present invention Figure 2 Enlarged view of the structure of part B.

[0023] Figure 6 This is a schematic diagram of the overall structure of the plunger rod of the present invention.

[0024] Figure 7 This is a cross-sectional view of the plunger rod after the flow seat with the smaller diameter orifice has been replaced according to the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the present invention when a double-set through-hole sealing ring structure is adopted.

[0026] Figure 9 This is a schematic diagram of the structure of the present invention when a sealing ring plus a retaining ring combination is used as the lower sealing ring assembly.

[0027] Figure 10 This is a schematic diagram of the piston rod rotation process when the present invention changes from the closed to the open state.

[0028] Figure 11 This is a schematic diagram of the structure of the present invention after adding a pressure-reducing cavity to the valve body.

[0029] Figure 12 For the present invention Figure 11 Enlarged view of the C-section structure.

[0030] Figure 13 This is a schematic diagram of the structure of the present invention after adding a second piston hole in the plunger rod and a first piston hole in the valve body.

[0031] Figure 14 For the present invention Figure 13 Enlarged view of the structure of part D.

[0032] Figure 15 This is a schematic diagram of the structure of the limiting and fixing device of the present invention when the short protrusion inside the device compresses the second movable block.

[0033] Figure 16 This is a diagram showing the state of the long protrusion at the bottom of the limiting protrusion ring of the plunger rod of the present invention as it gradually squeezes the first movable block.

[0034] Figure 17 This is a schematic diagram of the structure of the present invention, which uses an automatic pressurization structure to pressurize the gap between the plunger rod mounting hole and the plunger rod during the opening process of the throttle valve.

[0035] Figure 18 For the present invention Figure 17 Enlarged view of the E-section structure.

[0036] Figure 19 This is a diagram showing the state when the second piston hole is pressurized after the throttle valve of the present invention is opened, causing the through-hole sealing ring to be squeezed against the inner wall of the plunger rod mounting hole.

[0037] Figure 20 For the present invention Figure 19 Enlarged view of the F-section structure.

[0038] Figure 21 This is a diagram showing the state of the pressure relief chamber and the through hole in the flow seat after the throttle valve of the present invention is closed.

[0039] Figure 22 This is a schematic diagram of the opening and closing scheme of the present invention when used with a handle.

[0040] Figure 23 This is a schematic diagram of the scheme for controlling the opening and closing of the valve in conjunction with the electric valve controller of the present invention.

[0041] The attached figures are labeled as follows: 1. Valve body; 11. Plunger rod mounting hole; 12. Limiting pin; 13. Pressure relief assembly; 14. Pressure relief chamber; 141. Connecting hole; 15. First piston hole; 2. Plunger rod; 21. Upper sealing ring assembly; 22. Lower sealing ring assembly; 23. Limiting convex ring; 231. Long convex block; 24. Channel hole; 25. Engaging mounting groove; 26. Conical step; 27. Second piston hole; 28. Retaining ring; 3. Limiting retainer; 31. Short convex block; 4. Flow seat; 41. Shock-absorbing inner bushing; 42. Butt sealing ring; 43. Gasket; 5. Through-hole sealing ring; 6. Sealing plug; 61. Hollow elastic element; 62. Pressure sensor; 7. Second piston rod; 71. Second movable block; 8. First piston rod; 81. First movable block; 9. Push controller; 91. Threaded pin; 92. Motor. Detailed Implementation

[0042] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0043] Refer to the instruction manual appendix Figure 1 and Figure 2A high-pressure straight-through plunger-type throttle valve includes a valve body 1, a plunger rod 2, a limit retainer 3, and a flow seat 4. The inlet and outlet ends of the valve body 1 are coaxially connected, forming a direct flow channel. The valve body 1 also has a plunger rod mounting hole 11, which is perpendicular to the direct flow channel. The plunger rod 2 is rotatably mounted in the plunger rod mounting hole 11. A limit ring 23 is provided on the outer side of the top end of the plunger rod 2. The limit retainer 3 is detachably mounted on the valve body 1 at the position corresponding to the top end of the plunger rod 2, limiting the position of the limit ring 23. After the limit retainer 3 is fixed to the valve body 1... The plunger rod 2 is rotatably engaged with the limit retainer 3. The bottom end of the plunger rod 2 is provided with a channel hole 24. The flow seat 4 is detachably installed in the channel hole 24, which facilitates the quick disassembly and replacement of the entire throttle valve. The flow seat 4 is a tubular structure with a through hole inside. When the plunger rod 2 rotates to the point where the through hole of the flow seat 4 is coaxial with the direct flow channel of the valve body 1, the throttle valve is fully opened. The inner wall of the area near the inlet end of the through hole of the flow seat 4 is provided with a shock-absorbing inner bushing 41. The shock-absorbing inner bushing 41 is an elastic structure that can buffer the fluid impact formed when the throttle valve is initially opened.

[0044] Also, refer to the instruction manual appendix Figure 2 and Figure 4 A port sealing ring 5 is provided on the outer surface of the plunger rod 2 at the inlet and outlet ends corresponding to the flow seat 4. For details, please refer to the instruction manual appendix. Figure 5 and Figure 6 The outer surface of the plunger rod 2 is provided with a locking mounting groove 25 corresponding to the inlet and outlet ends of the flow seat 4. The port sealing ring 5 is installed in the locking mounting groove 25. The port sealing ring 5 can also be a conventional O-ring or other type of sealing ring, which is forcibly locked into the locking mounting groove 25. Alternatively, it can be adapted to the circumferential curved surface of the plunger rod 2 to set and produce a special sealing ring structure.

[0045] The valve body 1 has standard flange structures at both ends, which can be connected to flanged equipment. In addition, the valve body 1 and the plunger rod 2 can be made of low alloy steel to save costs. The wetted surfaces in contact with the fluid medium can be surface hardened by hard alloy overlay welding or tungsten carbide spraying, which reduces costs while adapting to high-pressure, high-impact and corrosion-resistant working conditions, and increases the service life of the device. The valve body 1 is equipped with a pressure relief component 13 on the side wall near the inlet end (such as the cooperation of a threaded hole and a threaded plug. After opening the threaded plug, the pressure inside the throttle valve can be relieved and discharged, so as to facilitate the disassembly, maintenance and replacement of corresponding parts of the throttle valve). A limit post 12 is provided in the valve body 1 at the position corresponding to the bottom end of the plunger rod 2. The bottom end of the plunger rod 2 is provided with a socket for rotating and inserting with the limit post 12, so that the rotation of the plunger rod 2 is more precise and stable.

[0046] Refer to the instruction manual appendix Figure 2 , Figure 4 and Figure 5 The plunger rod 2 has a tapered step 26 in the middle area. The plunger rod mounting hole 11 has a structure that cooperates with the tapered step 26 at the position corresponding to the tapered step 26, so as to achieve a tight fit and form a metal seal. An upper sealing ring assembly 21 is provided between the top area of ​​the plunger rod 2 and the plunger rod mounting hole 11, and a lower sealing ring assembly 22 is provided between the bottom area of ​​the plunger rod 2 and the plunger rod mounting hole 11. The upper sealing ring assembly 21 and the lower sealing ring assembly 22 can directly use O-rings, and corresponding grooves are provided on the plunger rod 2 for installing O-rings, thereby achieving sealing at the top and bottom of the plunger rod 2, which can realize the high-pressure sealing function of the throttle valve.

[0047] The valve body 1 is provided with a threaded structure that mates with the limit retainer 3, meaning the limit retainer 3 can be threaded onto the valve body 1 for easy disassembly and maintenance. If necessary, a retaining ring structure that engages with the limit retainer 3 can be provided on the outer side of the top of the plunger rod 2 to limit the relative axial movement between the limit retainer 3 and the plunger rod 2. The limit retainer 3 can be a conventional hammer nut (i.e., a union structure), or it can be a specialized structure. For example, while ensuring that the limit retainer 3 can restrict the installation of the plunger rod 2, it can also be used as a mounting platform for installing the control structure of the throttle valve. (In this invention, the plunger rod 2 can be docked with the corresponding control structure as needed, for example, refer to the appendix of the specification.) Figure 22 The piston rod 2 can be rotated by connecting the handle to the piston rod 2, or the piston rod 2 can be rotated by connecting the corresponding electric valve controller. At this time, the structure of the limit fixer 3 can be set according to the requirements.

[0048] The top of the plunger rod 2 can be provided with a threaded hole or other mating hole. This allows for the connection of other switch control structures, and also enables the plunger rod 2 to be removed by connecting lifting rings or other lifting structures when disassembling and maintaining the throttle valve, facilitating maintenance and replacement.

[0049] Refer to the instruction manual appendix Figure 3The channel hole 24 can be internally threaded, and the flow seat 4 is installed in the channel hole 24 via the threaded structure. Simultaneously, a raised step structure can be provided at the inlet end of the flow seat 4. A mating sealing ring 42 and a gasket 43 are provided between the raised step structure and the channel hole 24 to provide more stable support for the flow seat 4. When the throttle valve is open, the inlet end of the flow seat 4 corresponds to the inlet end of the valve body 1, that is, the raised step structure of the flow seat 4 also corresponds to the inlet end of the valve body 1. When fluid flows through the valve body 1, it can effectively support the flow seat 4. Furthermore, when the flow seat 4 is removed along with the plunger rod 2, it can be replaced using the aforementioned threaded installation. A flow seat 4 with a smaller orifice diameter can also be replaced. (Refer to the attached instruction manual.) Figure 7 Furthermore, it can be portablely replaced with different pipe diameters as needed to match different flow rate and pressure regulation control requirements.

[0050] It should be noted that the positions and quantities of the upper sealing ring assembly 21, the lower sealing ring assembly 22, and the through-hole sealing ring 5 described above are only one embodiment provided in this example. Further improvements in quantity and arrangement are possible if necessary, for example, as detailed in the appendix to the specification. Figure 8 and Figure 9 The port sealing ring 5 can be changed from a single set to a double set. The upper sealing ring assembly 21 and the lower sealing ring assembly 22 can be set as a sealing ring plus a retaining ring 28. Specifically, under low pressure conditions, the port sealing ring 5 acts as the second sealing layer, directly preventing liquid leakage along the gap between the plunger rod mounting hole 11 and the plunger rod 2. The upper sealing ring assembly 21 and the lower sealing ring assembly 22 act as the first sealing layer, preventing the leakage of medium after the port sealing ring 5 fails. Under high pressure conditions, the port sealing ring 5 is increased to two sets in the second sealing layer. A retaining ring 28 is added to the outside of the O-ring seals of the upper sealing ring assembly 21 and the lower sealing ring assembly 22 to prevent the O-ring seal from being squeezed and deformed due to high pressure, thus achieving high pressure sealing function.

[0051] During disassembly and maintenance, the pressure inside the valve body 1 is released through the pressure relief assembly 13. The retaining ring at the top of the plunger rod 2 is removed using a tool. Then, the limit retainer 3 is rotated in the opposite direction and removed. Using a lifting tool and the threaded hole at the top of the plunger rod 2, the plunger rod 2 and the flow seat 4 are lifted upwards together. Then, the new plunger rod 2 and the flow seat 4 are inserted as needed, or the original plunger rod 2 is retained and the flow seat 4 inside is replaced as needed. Finally, the above steps are reversed to complete the portable replacement.

[0052] It should be noted that in the above scheme, the valve body 1 adopts a straight-through structure, which reduces equipment energy loss, does not require changing the direction of the medium flow channel, occupies little well site space, solves layout problems, and reduces the additional equipment required by the angle fixed throttle valve, thus reducing costs. The direct threaded connection of the limit fixer 3 makes disassembly and assembly more convenient. The flow seat 4 and the plunger rod 2 are combined. When the flow seat 4 needs to be replaced, only the plunger rod 2 and the flow seat 4 need to be removed from the valve body for replacement, or only the channel hole 24 with a different diameter hole needs to be replaced, which saves time and effort. In addition to the upper sealing ring assembly 21 and the lower sealing ring assembly 22, the plunger rod 2 is provided with a port sealing ring 5 in the vicinity of the inlet and outlet ends of the flow seat 4, which effectively enhances the sealing ability of the medium. By replacing the port sealing ring 5, the upper sealing ring assembly 21 and the lower sealing ring assembly 22 with different materials, it can be used for different acidic working conditions.

[0053] Furthermore, in the above scheme, the throttle valve is mainly used in oil and gas extraction. However, in some applications, it is necessary to close the throttle valve and then open it after a period of time. Due to the inherent structure of throttle valve equipment, during the opening and closing process of the plunger rod 2, refer to the instruction manual appendix. Figure 10 When the through-hole sealing ring 5 is exposed in the direct flow channel of the valve body 1, fluid may seep into the contact gap between the plunger rod 2 and the plunger rod mounting hole 11 (depending on the specific application, for example, if installed on a natural gas pipeline, the fluid is gas; if installed on an oil pipeline or other liquid pipeline, the fluid is liquid). In this case, the throttle valve still has the upper sealing ring assembly 21, the lower sealing ring assembly 22, and the conical step 26 for sealing, preventing leakage. Therefore, it does not affect use in the short term. However, when transporting high-temperature fluids, for example, when the throttle valve is closed, the liquid does not flow, and the temperature gradually decreases. When the throttle valve is opened, the entire channel flows, and the fluid continues to flow, causing the overall temperature of the throttle valve to rise. Furthermore, after the throttle valve is opened, refer to the instruction manual attached... Figure 11 Under the action of the through-hole sealing ring 5, the area between the plunger rod 2 and the plunger rod mounting hole 11 is also relatively sealed. However, during the initial opening and closing process, some fluid, especially liquid, will inevitably seep into the gap between the two. As the high-temperature fluid continues to flow after the throttle valve is opened, the fluid in the gap will also increase in temperature. However, since it cannot move, after the fluid expands due to heat, it will squeeze the upper sealing ring assembly 21 and the lower sealing ring assembly 22, accelerating the wear of the upper sealing ring assembly 21 and the lower sealing ring assembly 22. In severe cases, some fluid will seep directly from the upper sealing ring assembly 21, affecting its use.

[0054] Therefore, to solve the above problems, this embodiment also provides the following technical solutions, specifically referring to the appendix to the specification. Figure 11 and Figure 12 The valve body 1 is provided with a pressure-reducing chamber 14. A sealing plug 6 is installed inside the pressure-reducing chamber 14. A hollow elastic element 61 is fixedly installed on one side of the sealing plug 6 corresponding to the flow seat 4. The pressure-reducing chamber 14 is connected to the gap between the plunger rod mounting hole 11 and the plunger rod 2 through the connecting hole 141. Specifically, by setting up the pressure-reducing chamber 14, even if some fluid seeps into the gap between the plunger rod 2 and the plunger rod mounting hole 11 during the use of the throttle valve, it can be concentrated and stored in the pressure-reducing chamber 14. Even if the fluid remaining in the gap between the plunger rod mounting hole 11 and the plunger rod 2 expands due to thermal expansion or other factors during the actual use of the throttle valve, it can also squeeze the hollow elastic element 61 and form a pressure buffer, avoiding the fluid pressure from affecting the upper sealing ring assembly 21 and the lower sealing ring assembly 22, thereby improving the performance and service life of the throttle valve.

[0055] It should be noted that in this solution, the sealing plug 6 can be a detachable installation structure. For example, the sealing plug 6 can be fixedly installed on the valve body 1 by means of a threaded structure. If necessary, the sealing plug 6 can also be disassembled for corresponding operations.

[0056] Furthermore, in oil extraction, throttle valves are highly likely to encounter fluids containing hard, fine particles, especially quartz sand and ceramsite. Particularly when the throttle valve is closed, the sidewall of the plunger rod 2 is directly exposed in the direct flow channel of the valve body 1. Fine particles in the fluid easily adhere to the sidewall of the plunger rod 2. When the throttle valve needs to be opened, the plunger rod 2 rotates in the opposite direction. Although the gap between the plunger rod 2 and the plunger rod mounting hole 11 is extremely small, preventing the particles from entering, the valve body 1 gradually scrapes away the particles on the outer wall of the plunger rod 2 during its rotation. As the through-hole sealing ring 5 is about to enter the plunger rod mounting hole 11, the particles are squeezed by the valve body 1 structure and the through-hole sealing ring 5. Especially when the particles scrape across the surface of the through-hole sealing ring 5 under significant pressure, they can easily damage it. Therefore, this embodiment also provides the following solution, specifically referring to the appendix to the instruction manual. Figure 13 and Figure 17 The pressure relief chamber 14 is connected to a pressure boosting component. This pressure boosting component is used to increase the fluid pressure in the gap between the plunger rod mounting hole 11 and the plunger rod 2 when the throttle valve is opened (i.e. when the plunger rod 2 rotates and the flow seat 4 gradually connects with the direct flow channel of the valve body 1). This allows the fluid to flow from the gap between the plunger rod mounting hole 11 and the plunger rod 2 into the direct flow channel of the valve body 1. As a result, a small liquid flow is formed on the surface of the through-hole sealing ring 5 during the process of the through-hole sealing ring 5 entering the plunger rod mounting hole 11. This causes the particles near the through-hole sealing ring 5 to flow away in advance, avoiding the particles from squeezing and scratching the through-hole sealing ring 5.

[0057] Among them, refer to the appendix of the instruction manual Figure 13 and Figure 14The booster assembly is a linked booster structure, which includes a first piston rod 8. A first piston hole 15 is provided inside the valve body 1, communicating with a connecting hole 141. The first piston rod 8 is slidably mounted on the top region of the first piston hole 15. A first movable block 81 is fixedly connected to the top of the first piston rod 8. A corresponding mounting groove is provided on the valve body 1 in the region corresponding to the first movable block 81. The first movable block 81 is slidably adapted to the bottom wall of the limiting protrusion ring 23. (Refer to the attached instruction manual.) Figure 14 and Figure 16 The bottom of the limiting ring 23 is fixedly connected to a long protrusion 231, which is slidably adapted to the first movable block 81. An elastic element is provided between the first piston rod 8 and the first piston hole 15. This elastic element is used to provide an upward elastic force to the first piston rod 8, such as a spring. The long protrusion 231 has an inclined slope. During the rotation of the plunger rod 2, the long protrusion 231 is driven to gradually adapt to the first movable block 81, thereby pressing down the first movable block 81. Specifically, when the plunger rod 2 changes from the closed to the open state, the long protrusion 231 gradually squeezes the first movable block 81, which increases the fluid pressure in the first piston hole 15 and the connecting hole 141, thereby causing some fluid to flow out from the gap between the plunger rod mounting hole 11 and the plunger rod 2 (the above compression is mechanical compression, while the function of the hollow elastic element 61 is mainly to buffer the pressure when the fluid thermally expands. Therefore, in this process, the hollow elastic element 61 can be compressed to its limit).

[0058] In addition, please refer to the appendix to the instruction manual. Figure 17 and Figure 19 Where cost permits, an automated control structure for fluid pressurization in the pressure-reducing chamber 14 can be implemented. For example, the pressurization component can be an automatic pressurization structure, which includes a push controller 9. The push controller 9 includes a threaded post 91 and a motor 92. The sealing plug 6 is slidably installed in the pressure-reducing chamber 14. The threaded post 91 is fixedly connected to the sealing plug 6 and threadedly installed inside the valve body 1. The motor 92 is fixedly installed on the valve body 1. The output shaft of the motor 92 is slidably inserted into the threaded post 91 via a sliding key. Thus, by driving the threaded post 91 to rotate, the motor 92 can control the movement of the sealing plug 6 within the pressure-reducing chamber 14, thereby forming a piston structure. Automatic control is performed when the throttle valve is opened or closed. If necessary, a pressure sensor 62 can also be installed inside the hollow elastic element 61 to detect the pressure on the hollow elastic element 61, thereby dynamically adjusting it through the push controller 9.

[0059] It should be noted that in the above scheme, during the rotation and opening of the plunger rod 2, the pressure relief chamber 14 is under pressure, and some fluid flows out of the gap between the plunger rod mounting hole 11 and the plunger rod 2. During subsequent use, fluid will seep back in, so it can basically return to normal. In addition, the shock-absorbing inner bushing 41 can also be set as a hollow structure. Like the hollow elastic element 61, the shock-absorbing inner bushing 41 can also provide pressure relief. For example, refer to the attached instruction manual. Figure 21 When the throttle valve is closed, the internal through hole of the flow seat 4 is connected to the pressure relief chamber 14. At this time, the shock-absorbing inner bushing 41 can also deform (e.g., expand) with the pressure change, thereby balancing the pressure in the pressure relief chamber 14 under normal conditions. When it is opened again, the flow seat 4 is connected to the direct flow channel of the valve body 1, which can restore the shock-absorbing inner bushing 41.

[0060] Further, please refer to the appendix to the instruction manual. Figure 13 and Figure 17 The plunger rod 2 has a second piston hole 27 inside. The second piston hole 27 and the engagement mounting groove 25 are filled with hydraulic fluid (e.g., hydraulic oil). The second piston hole 27 communicates with the engagement mounting groove 25. The through-hole sealing ring 5 is slidably installed in the engagement mounting groove 25. Further details are provided in the appendix of the instruction manual. Figure 13 and Figure 14 A second piston rod 7 is slidably mounted on the top of the second piston hole 27. A second movable block 71 is fixedly connected to the second piston rod 7. The plunger rod 2 is provided with a mounting groove for accommodating the second movable block 71. An elastic element (or a rubber pad or spring) is provided between the second piston rod 7 and the plunger rod 2. This elastic element provides an upward elastic force to the second movable block 71. A short protrusion 31 is provided on the mating surface between the limiting retainer 3 and the top wall of the limiting protrusion ring 23. When the short protrusion 31 contacts the second movable block 71, it exerts downward pressure on the second movable block 71, thereby causing the port sealing ring 5 to move outward. Specifically, when the plunger rod 2 rotates to close the throttle valve, before the port sealing ring 5 is fully inserted into the plunger rod mounting hole 11, the second movable block 71 does not contact the short protrusion 31. At this time, refer to the appendix of the instruction manual. Figure 17 and Figure 18 At this point, the port sealing ring 5 does not fully protrude from the plunger rod 2, therefore it is not easily squeezed by particles. After the port sealing ring 5 is fully inserted into the plunger rod mounting hole 11, refer to the instruction manual. Figure 19 and Figure 20 At this time, the short protrusion 31 contacts the second movable block 71, compressing the second piston rod 7. (Refer to the appendix of the instruction manual.) Figure 15 Then, by using hydraulic fluid to apply pressure to the through-hole sealing ring 5, the sealing effect between the through-hole sealing ring 5 and the plunger rod mounting hole 11 is increased, thereby effectively improving the service life of the through-hole sealing ring 5.

[0061] It should be noted that the cooperation between the second piston rod 7 and the second piston hole 27 is similar to the cooperation control between the first piston rod 8 and the first piston hole 15. The difference is that the triggering of the first piston rod 8 requires continuous and relatively long control. Therefore, the long protrusion 231 is set to be relatively long. On the contrary, the second piston rod 7 only needs to be triggered immediately at the corresponding position. Therefore, the short protrusion 31 is set to be relatively short. If necessary, the control of the through-hole sealing ring 5 can also be controlled by an automatic control structure similar to that of the push controller 9.

[0062] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A high-pressure straight-through plunger-type throttle valve, comprising a valve body (1), a plunger rod (2), a limit retainer (3), and a flow seat (4), characterized in that: The valve body (1) has a direct flow channel inside, and a plunger rod mounting hole (11) is also provided inside the valve body (1). The plunger rod (2) is rotatably installed in the plunger rod mounting hole (11), and a limit ring (23) is provided on the outer side of the top end of the plunger rod (2). A limit retainer (3) is detachably installed on the valve body (1) at the position corresponding to the top end of the plunger rod (2). A channel hole (24) is provided inside the bottom end of the plunger rod (2), and the flow seat (4) is detachably installed in the channel hole. In (24), a port sealing ring (5) is provided on the outer surface of the plunger rod (2) in the area corresponding to the inlet and outlet ends of the flow seat (4). A pressure relief chamber (14) is provided in the valve body (1). A sealing plug (6) is installed inside the pressure relief chamber (14). A hollow elastic element (61) is fixedly installed on one side of the flow seat (4) corresponding to the sealing plug (6). The pressure relief chamber (14) is connected to the gap between the plunger rod mounting hole (11) and the plunger rod (2) through the connecting hole (141). The middle region of the plunger rod (2) is provided with a tapered step (26), and the plunger rod mounting hole (11) is provided with a structure that cooperates with the tapered step (26) at the position corresponding to the tapered step (26). An upper sealing ring assembly (21) is provided between the top region of the plunger rod (2) and the plunger rod mounting hole (11), and a lower sealing ring assembly (22) is provided between the bottom region of the plunger rod (2) and the plunger rod mounting hole (11). A locking mounting groove (25) is provided on the outer surface of the plunger rod (2) at the region corresponding to the inlet and outlet ends of the flow seat (4). The through-hole sealing ring (5) is installed in the locking mounting groove (25). The pressure relief chamber (14) is connected to a pressure boosting component, which is used to increase the fluid pressure in the gap between the plunger rod mounting hole (11) and the plunger rod (2) when the throttle valve is opened, so that the fluid flows from the gap between the plunger rod mounting hole (11) and the plunger rod (2) into the direct flow channel of the valve body (1). The booster assembly is a linkage booster structure, which includes a first piston rod (8). The valve body (1) has a first piston hole (15) inside, which communicates with a connecting hole (141). The first piston rod (8) is slidably mounted on the top end of the first piston hole (15). A first movable block (81) is fixedly connected to the top of the first piston rod (8). The first movable block (81) is slidably adapted to the bottom wall of the limiting protrusion ring (23). A long protrusion (231) is fixedly connected to the bottom of the convex ring (23). The long protrusion (231) is slidably adapted to the first movable block (81). The long protrusion (231) has an inclined slope. During the rotation of the plunger rod (2), the long protrusion (231) is gradually adapted to the first movable block (81), thereby pressing down the first movable block (81). An elastic element is provided between the first piston rod (8) and the first piston hole (15). The elastic element is used to provide an upward elastic force to the first piston rod (8). The inner wall of the flow seat (4) near the inlet end is provided with a shock-absorbing inner liner (41). The shock-absorbing inner liner (41) is a hollow elastic structure. The connecting hole (141) is provided in correspondence with the inner through hole of the flow seat (4).

2. The high-pressure straight-through plunger-type throttle valve according to claim 1, characterized in that: The plunger rod (2) has a second piston hole (27) inside. The second piston hole (27) and the engagement mounting groove (25) are filled with hydraulic fluid. The second piston hole (27) communicates with the engagement mounting groove (25). The through-hole sealing ring (5) is slidably installed in the engagement mounting groove (25). The top of the second piston hole (27) is slidably installed with a second piston column (7). A second movable block (71) is fixedly connected to the second piston column (7). An elastic element is provided between the second piston column (7) and the plunger rod (2). The elastic element is used to provide an upward elastic force to the second movable block (71). A short protrusion (31) is provided on the mating surface of the limiting fixing device (3) and the top wall of the limiting protrusion ring (23). When the short protrusion (31) contacts the second movable block (71), it forms a downward compression on the second movable block (71).

3. A high-pressure straight-through plunger-type throttle valve according to claim 2, characterized in that: A pressure relief assembly (13) is provided on the side wall of the valve body (1) near the inlet end. A limit post (12) is provided inside the valve body (1) at the position corresponding to the bottom end of the plunger rod (2). The bottom end of the plunger rod (2) is provided with an insertion hole for rotating insertion with the limit post (12).

4. A high-pressure straight-through plunger-type throttle valve according to claim 3, characterized in that: The valve body (1) is provided with a threaded structure that cooperates with the limiting retainer (3). The limiting retainer (3) is installed on the valve body (1) through the threaded structure. The inside of the channel hole (24) is provided with a threaded structure. The flow seat (4) is installed with the channel hole (24) through the threaded structure. The inlet end of the flow seat (4) is provided with a raised step structure. A mating sealing ring (42) and a gasket (43) are provided between the raised step structure and the channel hole (24).

5. A high-pressure straight-through plunger-type throttle valve according to claim 4, characterized in that: The inlet and outlet sealing rings (5) of the flow seat (4) are provided in two sets respectively. The two sets of inlet sealing rings (5) are distributed in an inner and outer ring pattern. The upper sealing ring assembly (21) and the lower sealing ring assembly (22) are both composed of sealing rings and retaining rings (28).

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