A seal-enhanced needle valve and packing compression device therefor

Abstract

The application discloses a sealing enhanced needle valve and a packing pressing device thereof, relates to the technical field of needle valves, and aims to solve the technical problem that the needle valve is mostly in a straight cylinder structure, the packing chamber is in a plane structure, the single-stage sealing redundancy is low, and it is difficult to maintain stable sealing performance under high-pressure working conditions, and comprises a valve body. The application is characterized in that a stepped packing chamber is arranged in the valve body by designing the internal sealing structure of the valve body, a cylindrical chamber layout with five levels of diameters is adopted and gradually increases from top to bottom, the special curved surface design of the top surface concave arc surface and the bottom surface convex arc surface of the chamber is adopted, the stress distribution mode of the packing is optimized, the directional cooperation of the plug-in groove and the plug-in rod and the adjacent split circle deflection misplacement design are adopted, the linkage sealing property of the multi-stage sealing element is further strengthened, and the splicing gap leakage channel is eliminated. The application is characterized in that the internal sealing structure of the valve body is designed, the sealing stability, the pressure-bearing capacity and the service life of the valve body are greatly improved, and the long-term sealing requirement of the valve body under high-pressure and alternating working conditions is met.

Description

Technical Field

[0001] This invention relates to the field of needle valve technology, and more specifically, to a sealing-enhanced needle valve and its packing clamping device. Background Technology

[0002] As a core precision control component in industrial fluid pipeline systems, needle valves, with their conical mating structure between the valve core and seat, offer advantages such as precise flow regulation and strong shut-off sealing. They are widely used in petrochemical, power energy, instrumentation and control, and high-pressure pipelines, and are particularly suitable for harsh conditions such as high pressure, alternating pressure, and highly corrosive media. The sealing performance of a needle valve is a core indicator determining its operational reliability, service life, and system safety. The packing seal structure at the valve stem-body mating point is crucial for preventing media leakage and ensuring the overall sealing effect. Simultaneously, the overall sealing layout within the valve body directly affects pressure resistance stability and long-term operational capability.

[0003] However, most existing needle valves are of the uniform diameter straight-cylinder structure, resulting in poor uniformity of packing stress and a tendency for localized stress concentration under high-pressure conditions. Furthermore, traditional stuffing boxes have a planar structure and low single-stage sealing redundancy, making it difficult to maintain stable sealing performance under high-pressure conditions and leading to a short service life. Therefore, we propose a sealing-enhanced needle valve and its packing clamping device. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a sealing-enhanced needle valve and its packing clamping device to solve the technical problem that most current needle valves are cylindrical structures with planar packing gland chambers, resulting in low single-stage sealing redundancy and difficulty in maintaining stable sealing performance under high-pressure conditions.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a sealing-enhanced needle valve, comprising a valve body; The valve body has a stuffing box inside, which is composed of several cylindrical chambers. The diameter of the cylindrical chambers gradually increases from top to bottom. The top and bottom surfaces of the cylindrical chambers are respectively set as concave arc surfaces and convex arc surfaces. The stuffing box is provided with a compression contact ring at the top, a pressure bearing contact ring at the bottom, and a number of sealing packing rings between the compression contact ring and the pressure bearing contact ring. The compression contact ring, the pressure bearing contact ring and the sealing packing ring are all composed of a number of equally spaced annular sub-rings and a number of equally spaced annular sub-rings, and the number of sub-rings are respectively sleeved on the outer wall of the number of sub-rings through inclined surfaces. The top of each of the several sub-rings of the compression contact ring and the several sub-rings of the sealing packing ring are provided with insertion grooves, and the insertion grooves are arc tracks arranged circumferentially. The cross-sectional width of the insertion grooves gradually shortens from the starting end to the ending end. The ending end of the insertion grooves is provided with a retaining groove, and the retaining grooves are arc-shaped grooves arranged radially. The bottom of each of the several sub-rings of the pressure-bearing contact ring and the several sub-rings of the sealing packing rings is provided with an insertion rod, and the insertion rod is inserted into the insertion groove. The sub-rings in the adjacent cylindrical chambers are deflected by 5-15°. The top of each of the several sub-circles of the compression contact ring is provided with several ring plates.

[0006] A packing clamping device for a sealing-enhanced needle valve, comprising a pressure ring assembly; The pressure ring assembly includes an embedded ring and a positioning structure. The embedded ring is installed at the bottom end of the positioning structure, and the positioning structure is detachably connected to the valve body. The embedded ring is embedded into an annular cavity composed of several annular plates, and the bottom end of the embedded ring is provided with an arc-shaped contact surface adapted to the pressure contact ring. Several inclined screw-in grooves are provided equidistantly in an annular pattern on the side wall of the embedded ring. Several screw-in protrusions are slidably connected in the several screw-in grooves, and the several screw-in protrusions are provided equidistantly in an annular pattern on the inner wall of several annular plates.

[0007] Preferably, both sides of the screw-in groove and the screw-in protrusion are provided with matching oblique concave surfaces. The oblique concave surfaces are used to apply an outward force to the screw-in protrusion when the screw-in groove is screwed into it, so that the plug rod can move toward the slot.

[0008] Preferably, the bottom end of the embedded ring is further provided with an annular positioning block, and the cross-section of the positioning block is a trapezoidal surface. The positioning block is embedded in an annular groove composed of several positioning grooves, and the several positioning grooves are respectively opened at the top ends of several sub-rings of the pressing contact ring.

[0009] Preferably, the positioning block is made of a material with a low coefficient of thermal expansion, and the positioning block is used to automatically compensate for the axial and radial relaxation gaps of the packing by utilizing the expansion difference under high temperature conditions.

[0010] Preferably, the positioning structure includes a positioning ring, a positioning plate, and an ejector ring; The positioning ring is located above the embedded ring. Several positioning plates are equidistantly and circumferentially slidably connected to the side wall of the positioning ring. The ejection ring is inserted into the positioning ring. Several positioning plates are respectively inserted into several fixing slots, and several fixing slots are equidistantly and circumferentially opened on the inner wall of the valve body. The ejection ring is used to eject the positioning plates onto the fixing slots.

[0011] Preferably, the positioning plates are divided into upper and lower groups, and both groups of positioning plates are inclined, with the inclination directions of the two groups of positioning plates being opposite, and the head end of the positioning plate being a trapezoidal end.

[0012] Preferably, the top end of the positioning ring is provided with an ejection groove, and the ejection groove is adapted to the ejection ring. The cross section of the ejection groove is a trapezoidal surface, and the rear ends of the plurality of positioning plates are adapted to the ejection ring.

[0013] Preferably, a plurality of insertion holes are provided at equal intervals in a ring on the bottom surface of the ejector groove, and a plurality of rotating rods are respectively inserted into the plurality of insertion holes. The rotating rods are used to be inserted into the insertion holes before the positioning plate extends, so as to push the positioning ring to move downward and rotate.

[0014] Preferably, a sleeve is installed on the ejector ring, a convex ring is installed on the side wall of the sleeve, a plurality of rotating rods are slidably connected to the convex ring, and a plurality of rotating rods are slidably connected to the ejector ring, a plurality of rotating rods are installed on a turntable, and the turntable is fitted with a threaded disc, the threaded disc being threadedly connected to the sleeve.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the design of the internal sealing structure of the valve body, incorporates a stepped stuffing box within the valve body, employing a five-stage cylindrical chamber layout with progressively increasing diameters from top to bottom. Combined with a special curved surface design—a concave arc surface on the top and a convex arc surface on the bottom of the chambers—this optimizes the stress distribution of the packing. Furthermore, the directional fit of the insertion groove and insertion rod, along with the offset design of adjacent rings, further enhances the interlocking sealing performance of the multi-stage seals, eliminating leakage channels at joint gaps. This invention, through the design of the internal sealing structure of the valve body, significantly improves the valve body's sealing stability, pressure resistance, and service life, adapting to the long-term sealing requirements of valve bodies under high pressure and alternating operating conditions.

[0016] 2. This invention, through the design of a matching clamping device, allows the embedded ring to be embedded into the annular cavity composed of six ring plates after the clamping ring assembly is assembled, achieving coaxial positioning. The bottom end of the embedded ring has an arc-shaped contact surface that matches the top contour of the clamping contact ring, ensuring uniform clamping force and no local stress concentration. Six inclined screw-in grooves are equidistantly arranged in a ring on the side wall of the embedded ring, and six screw-in protrusions are correspondingly equidistantly arranged in a ring on the inner wall of the six ring plates, and are slidably connected to the six screw-in grooves. Both sides of the screw-in grooves and screw-in protrusions are provided with matching inclined concave surfaces. During rotation, the inclined concave surfaces cooperate with each other, continuously applying an outward radial thrust to the screw-in protrusion. This causes the insertion rod of the adjacent sealing element to slide and lock into the slot at the end of the insertion groove, achieving automatic locking of multi-level sealing rings. This invention optimizes the uniformity of compression force by setting up a pressure ring assembly. At the same time, it uses the screw-in squeezing force to drive the bottom insertion structure to be fully locked, eliminating loose gaps in the spliced ​​sealing elements, enhancing the overall sealing performance of multi-level seals, and solving the problems of uneven pressure ring compression and loosening and leakage at the joints of traditional sealing elements.

[0017] 3. This invention adds an annular positioning block and a matching positioning groove structure. An additional annular positioning block is provided at the bottom of the embedded ring. The trapezoidal cross-section design of this positioning block enables rapid guidance and clamping positioning during assembly. The dual positioning, combined with the guide structure of the screw-in groove and screw-in protrusion, prevents radial deflection and axial misalignment between the embedded ring and the compression contact ring, ensuring that the clamping force of the pressure ring assembly is evenly transmitted to each sub-ring, avoiding localized force deviation that could lead to sealing failure. When the valve operates under high-temperature media conditions, the valve body and sealing packing will experience normal thermal expansion. After long-term use, the packing is prone to thermal relaxation and increased sealing gaps. The positioning block, with its low coefficient of thermal expansion, expands much less than the valve body and sealing packing. Through its own dimensional stability, it automatically compensates for the axial and radial gaps caused by packing relaxation, maintaining the tightness of the multi-stage sealing assembly. This invention optimizes the assembly accuracy of the pressure ring assembly and the compression contact ring through the design of the annular positioning block and matching positioning groove structure. Simultaneously, relying on a low coefficient of thermal expansion material, it achieves automatic gap compensation under high-temperature conditions, perfecting a long-lasting sealing system under all operating conditions.

[0018] 4. This invention, through the design of a positioning structure, forms a radially expandable locking unit. By axially pushing in the ejector ring, twelve positioning plates are simultaneously ejected radially, allowing them to precisely insert into their corresponding fixing slots. This achieves a detachable, rigid locking between the positioning structure and the valve body, ensuring a secure and uniformly distributed assembly. This prevents loosening or displacement of the positioning structure during valve operation. The top of the positioning ring has an ejector groove that matches the ejector ring. The ejector groove has a trapezoidal cross-section, which guides and positions the ejector ring during assembly, ensuring its smooth and coaxial insertion. The trapezoidal surface design also provides self-locking and anti-disengagement properties, preventing accidental retraction of the ejector ring. This invention, through the design of the positioning structure, improves the assembly and disassembly performance of the pressure ring assembly, enabling rapid locking and positioning within the valve body and convenient disassembly and maintenance. It forms a closed-loop cooperation with the overall sealing structure, balancing sealing stability and ease of maintenance.

[0019] 5. This invention utilizes a linkage structure involving a rotating rod, turntable, and threaded disc. The rotating rod provides pre-positioning drive, inserting itself into the insertion hole before the ejector ring pushes the positioning plate out. This triggers the insertion ring to complete the screwing action, ensuring the insertion groove and protrusion are fully slid into place and the insertion rod is completely engaged in the slot. This pre-locking of the sealing assembly is achieved before the positioning plate is ejected and fixed, preventing issues like incomplete locking or residual sealing gaps caused by incorrect assembly sequence. This invention optimizes the assembly accuracy and ease of operation of the positioning structure through the linkage structure of the rotating rod, turntable, and threaded disc. It achieves precise step-by-step operation of first rotating for alignment and then ejecting for locking, making the linkage locking of the entire pressure ring and sealing assembly smoother and more accurate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the stuffing box structure of the present invention.

[0023] Figure 4 This is a top view of the compression contact ring of the present invention.

[0024] Figure 5 This is a bottom view of the compression contact ring of the present invention.

[0025] Figure 6 This is a top view of the sealing packing ring of the present invention.

[0026] Figure 7 This is a schematic diagram of the staggered arrangement of the rings in this invention.

[0027] Figure 8 This is a cross-sectional view of the pressure ring assembly of the present invention.

[0028] Figure 9 This is a top view of the embedded ring structure of the present invention.

[0029] Figure 10 This is a bottom view of the embedded ring structure of the present invention.

[0030] Figure 11 This is a schematic diagram of the positioning ring of the present invention.

[0031] Figure 12 This is a schematic diagram of the structure of the ejector ring of the present invention.

[0032] Figure 13 This is a schematic diagram of the structure of the rotating rod in this invention.

[0033] Figure 14 This is a schematic diagram of the structure when the rotating rod of the present invention moves downward.

[0034] Figure 15 This is a schematic diagram of the structure when the rotating rod of the present invention moves upward.

[0035] Explanation of the labels in the diagram: 1. Valve body; 2. Pressure ring assembly; 101. Stuffing gland; 102. Compression contact ring; 103. Pressure-bearing contact ring; 104. Sealing packing ring; 105. Insertion groove; 106. Slot; 107. Insertion rod; 108. Ring plate; 109. Fixing groove; 1021. Positioning groove; 1081. Screw in the protrusion; 201. Embedded ring; 202. Positioning structure; 2011, Screw-in groove; 2012, Positioning block; 2021, Positioning ring; 2022, Positioning plate; 2023, Ejection ring; 2024, Ejection groove; 2025, Insertion hole; 2026, Rotating rod; 2027, Turntable; 2028, Threaded disc. Detailed Implementation

[0036] Examples, such as Figures 1 to 7 As shown, the present invention relates to a sealing-enhanced needle valve, comprising a valve body 1; a stuffing box 101 is provided inside the valve body 1, the stuffing box 101 is composed of five cylindrical chambers, and the diameter of the five cylindrical chambers gradually increases from top to bottom, and the top surface and bottom surface of the stuffing box 101 are respectively set as concave arc surface and convex arc surface. The stuffing box 101 contains a compression contact ring 102 at the top, a pressure-bearing contact ring 103 at the bottom, and three sealing packing rings 104 between the compression contact ring 102 and the pressure-bearing contact ring 103. The compression contact ring 102, the pressure-bearing contact ring 103, and the sealing packing rings 104 are each composed of six equally spaced annular sub-rings and six equally spaced annular sub-rings, with each sub-ring being fitted onto the outer wall of the six sub-rings via an inclined surface. Insertion points are provided at the top of each of the six sub-rings of the compression contact ring 102 and the six sub-rings of the three sealing packing rings 104. The groove 105 is an arc track arranged circumferentially. The cross-sectional width of the groove 105 gradually shortens from the starting end to the ending end. The ending end of the groove 105 is provided with a retaining groove 106, which is an arc-shaped groove arranged radially. The bottom ends of the six sub-rings of the pressure-bearing contact ring 103 and the six sub-rings of the three sealing packing rings 104 are all provided with insert rods 107, and the insert rods 107 are inserted into the groove 105. The sub-rings in the adjacent cylindrical chambers are deflected by 5-15°. The top ends of several sub-rings of the pressing contact ring 102 are respectively provided with six ring plates 108.

[0037] This invention constructs a sealing system that combines a stepped multi-stage sealing cavity with modular splicing sealing components through the design of the internal sealing structure of the valve body 1.

[0038] This invention utilizes a stepped stuffing box 101 inside the valve body 1, employing a five-stage cylindrical chamber layout with progressively increasing diameters from top to bottom. Combined with a special curved surface design featuring a concave top surface and a convex bottom surface, this optimizes the stress distribution of the packing, avoiding the problems of localized stress concentration and packing compression damage associated with traditional straight-tube stuffing boxes 101. The progressively increasing diameter design achieves multi-stage pressure bearing and layered sealing. The concave and convex surfaces fit together perfectly, increasing the sealing contact area and guiding pressure evenly, preventing packing edge warping and potential leakage.

[0039] This invention utilizes a modular, spliced ​​sealing component design, dividing the internal sealing elements of the stuffing box 101 into a top pressure contact ring 102, a bottom pressure-bearing contact ring 103, and three sets of sealing packing rings 104 in the middle. Each type of ring is composed of six equally spaced rings and sub-rings arranged in a ring shape. The six sub-rings are fitted onto the outer walls of the six sub-rings by inclined surfaces, forming a spliced ​​sealing unit. Compared to integral sealing packing, this structure can adapt to the deformation of the stuffing box 101's internal cavity, eliminating the need for complete replacement in case of localized damage, and making disassembly and maintenance more convenient. At the same time, the inclined surface fitting design enhances the tightness of the connection between the sub-rings and sub-rings, preventing radial misalignment and ensuring the integrity of the seal.

[0040] This invention further enhances the linkage sealing performance of multi-stage seals and eliminates leakage channels in splicing seams through the directional engagement of the insertion groove 105 and the insertion rod 107, and the offset design of adjacent rings. A circumferential arc-shaped insertion groove 105 is provided at the top of the rings of the compression contact ring 102 and the sealing packing ring 104. The cross-sectional width of the insertion groove 105 gradually narrows from the starting point to the ending point, with a radial arc-shaped groove 106 at the ending point. Insertion rods 107 are correspondingly provided at the bottom of the rings of the pressure-bearing contact ring 103 and the sealing packing ring 104. The insertion rod 107 is precisely inserted into the insertion groove 105, slides along the arc track to the ending point, and then engages with the groove 106, achieving directional locking and gapless splicing of adjacent seals. The rings in adjacent cylindrical chambers maintain a 5-15° offset layout, staggering the splicing seams of each ring to form a labyrinthine sealing path, completely blocking the possibility of media leakage along the splicing seams.

[0041] This invention achieves uniform compression force by setting six ring plates 108 at the top of each segment of the compression contact ring 102, avoiding excessive local compression that could lead to packing damage and insufficient compression that could cause leakage. The multi-stage sealing assembly forms an overall sealing structure through plug-in locking and deflection misalignment. Combined with the uniform pressure-bearing curved surface of the stepped stuffing box 101, it achieves long-term stable sealing under high-pressure conditions. It also has multiple advantages such as convenient disassembly and assembly, reliable sealing, deformation resistance, and wear resistance, thus comprehensively improving the overall sealing performance of the valve body 1.

[0042] This invention addresses the industry pain points of uneven sealing, easy leakage, packing deformation due to compression, and difficulty in disassembly and maintenance of traditional valve stuffing boxes 101 through the design of the internal sealing structure of the valve body 1. It significantly improves the sealing stability, pressure bearing capacity and service life of the valve body 1, and is suitable for the long-term sealing requirements of the valve body 1 under high pressure and alternating working conditions.

[0043] like Figures 8 to 10As shown, the present invention relates to a packing compression device for a sealing-enhanced needle valve, comprising a compression ring assembly 2; the compression ring assembly 2 includes an embedded ring 201 and a positioning structure 202, the embedded ring 201 is installed at the bottom end of the positioning structure 202, and the positioning structure 202 is detachably connected to the valve body 1, the embedded ring 201 is embedded into an annular cavity formed by six annular plates 108, and the bottom end of the embedded ring 201 is provided with an arc-shaped contact surface adapted to the compression contact ring 102, and six inclined screw-in grooves 2011 are provided equidistantly in annular arrangement on the side wall of the embedded ring 201, and six screw-in protrusions 1081 are slidably connected in the six screw-in grooves 2011 respectively, and the six screw-in protrusions 1081 are equidistantly arranged in annular arrangement on the inner wall of the six annular plates 108.

[0044] Both sides of the screw-in groove 2011 and the screw-in protrusion 1081 are provided with matching oblique concave surfaces. The oblique concave surfaces are used to apply an outward force to the screw-in protrusion 1081 when the screw-in groove 2011 is screwed into the screw-in protrusion 1081, so that the plug rod 107 can move toward the slot 106.

[0045] This invention achieves directional pressing and linkage locking of the top sealing component through the design of a matching pressing device.

[0046] The pressure ring assembly 2 includes an embedded ring 201 and a positioning structure 202. The embedded ring 201 is fixedly installed at the bottom of the positioning structure 202. The positioning structure 202 is detachably connected to the valve body 1. After assembly, the embedded ring 201 is precisely embedded in the annular cavity composed of six ring plates 108 to achieve coaxial positioning. The bottom of the embedded ring 201 is provided with an arc-shaped contact surface that matches the pressing contact ring 102, which fits the top contour of the pressing contact ring 102 to ensure uniform pressing force and no local stress concentration.

[0047] Six inclined screw-in grooves 2011 are equidistantly arranged in a ring on the side wall of the embedded ring 201. Six screw-in protrusions 1081 are correspondingly equidistantly arranged in a ring on the inner wall of the six ring plates 108 and are slidably connected to the inside of the six screw-in grooves 2011. Both sides of the screw-in grooves 2011 and the screw-in protrusions 1081 are provided with matching inclined concave surfaces. When the positioning structure 202 is assembled, the screw-in grooves 2011 rotate and slide with the embedded ring 201. The inclined concave surfaces cooperate with each other and continuously apply an outward radial thrust to the screw-in protrusions 1081. This thrust is synchronously transmitted to the segment rings of the pressing contact ring 102, thereby driving the plug rod 107 of the adjacent sealing element to slide precisely into the slot 106 at the end of the plug groove 105 and lock it in place. Without additional auxiliary operation, the automatic locking of the multi-level sealing segment rings can be achieved, preventing the plug rod 107 from loosening and the splicing gap from widening.

[0048] This invention optimizes the uniformity of compression force by setting up a pressure ring assembly 2, and at the same time uses the screw-in squeezing force to drive the bottom plug structure to be fully clamped, eliminating the loose gaps of the spliced ​​seals, strengthening the overall sealing performance of the multi-stage seal, and solving the problems of uneven compression of traditional pressure rings and loosening and leakage at the joints of seals.

[0049] Specifically, such as Figures 9 to 10 As shown, the bottom end of the embedded ring 201 of the present invention is also provided with an annular positioning block 2012, and the cross section of the positioning block 2012 is a trapezoidal surface. The positioning block 2012 is embedded and connected to an annular groove composed of six positioning grooves 1021. The six positioning grooves 1021 are respectively opened at the top ends of the six sub-rings of the pressing contact ring 102.

[0050] The positioning block 2012 is made of materials with low thermal expansion coefficients such as Invar alloy and low expansion ceramics. The positioning block 2012 is used to automatically compensate for the axial and radial relaxation gaps of the packing by utilizing the expansion difference under high temperature conditions.

[0051] This invention adds an annular positioning block 2012 and a matching positioning groove 1021 structure. An annular positioning block 2012 is additionally set at the bottom of the embedded ring 201. The positioning block 2012 has a trapezoidal cross-section and is embedded in the annular groove formed by the six positioning grooves 1021 at the top of the six sub-rings of the compression contact ring 102. The trapezoidal surface design realizes quick guidance and clamping positioning during assembly. The dual positioning, together with the guide structure of the screw-in groove 2011 and the screw-in protrusion 1081, prevents radial deflection and axial misalignment between the embedded ring 201 and the compression contact ring 102, ensuring that the clamping force of the compression ring assembly 2 is evenly transmitted to each sub-ring and avoiding local force deviation that leads to sealing failure.

[0052] When the valve operates under high-temperature media conditions, the valve body 1 and the sealing packing will undergo normal thermal expansion. After long-term use, the packing is prone to thermal relaxation and increased sealing gap. However, the expansion of the positioning block 2012 with a low coefficient of thermal expansion is much smaller than that of the valve body 1 and the sealing packing. Through its own dimensional stability, it automatically compensates for the axial and radial gaps caused by packing relaxation, and always maintains the tightness of the multi-stage sealing components. No manual secondary tightening and adjustment is required, and it maintains the continuous sealing effect under high pressure and high temperature alternating conditions.

[0053] This invention optimizes the assembly accuracy of the pressure ring assembly 2 and the pressing contact ring 102 through the design of the annular positioning block 2012 and the matching positioning groove 1021. At the same time, it relies on materials with low thermal expansion coefficient to achieve automatic gap compensation under high temperature conditions, overcoming the industry problem of traditional stuffing box 101 in high temperature alternating environment, such as packing thermal relaxation, increased sealing gap and media leakage, and improving the long-term sealing system under all working conditions.

[0054] It is worth noting that, such as Figures 3 to 12As shown, the positioning structure 202 of the present invention includes a positioning ring 2021, a positioning plate 2022, and an ejector ring 2023. The positioning ring 2021 is disposed above the embedded ring 201. Twelve positioning plates 2022 are equidistantly and circumferentially slidably connected to the side wall of the positioning ring 2021. The ejector ring 2023 is inserted into the positioning ring 2021. The twelve positioning plates 2022 are respectively inserted into twelve fixing slots 109, and the twelve fixing slots 109 are equidistantly and circumferentially opened on the inner wall of the valve body 1. The ejector ring 2023 is used to eject the positioning plate 2022 onto the fixing slot 109.

[0055] The top of the positioning ring 2021 is provided with an ejection groove 2024, and the ejection groove 2024 is adapted to the ejection ring 2023. The cross section of the ejection groove 2024 is set as a trapezoidal surface, and the rear ends of the twelve positioning plates 2022 are adapted to the ejection ring 2023.

[0056] The twelve positioning plates 2022 are divided into two groups, upper and lower, and both groups of positioning plates 2022 are set at an angle. The angles of the two groups of positioning plates 2022 are opposite, and the head end of the positioning plate 2022 is set as a trapezoidal end.

[0057] This invention utilizes a positioning structure 202, which includes a positioning ring 2021, positioning plates 2022, and an ejector ring 2023. The positioning ring 2021 is fixedly positioned above the embedded ring 201, forming the main support of the positioning structure 202. Twelve positioning plates 2022 are equidistantly distributed in a ring and slidably connected to the inside of the side wall of the positioning ring 2021, forming a radially expandable locking unit. The ejector ring 2023 is coaxially inserted into the internal cavity of the positioning ring 2021. The twelve positioning plates 2022 correspond to the twelve fixed grooves 109 equidistantly opened in a ring on the inner wall of the valve body 1. By axially pushing the ejector ring 2023, the twelve positioning plates 2022 are simultaneously ejected radially, allowing the positioning plates 2022 to be precisely inserted into the corresponding fixed grooves 109. This achieves a detachable rigid locking between the positioning structure 202 and the valve body 1, ensuring a firm assembly and uniform force distribution, preventing the positioning structure 202 from loosening or shifting during valve operation.

[0058] The top of the positioning ring 2021 is provided with an ejection groove 2024 that matches the ejection ring 2023. The ejection groove 2024 has a trapezoidal cross-section, which can guide and position the ejection ring 2023 during assembly, ensuring that the ejection ring 2023 is pushed in smoothly and coaxially. At the same time, the trapezoidal surface design has a self-locking and anti-disengagement characteristic to prevent the ejection ring 2023 from accidentally retracting. The rear end face shape of the twelve positioning plates 2022 matches the outer wall of the ejection ring 2023, ensuring that when the ejection ring 2023 is pushed in axially, all positioning plates 2022 can be ejected radially synchronously and evenly, with balanced force and no jamming, avoiding locking failure due to a single positioning plate 2022 not being ejected in place.

[0059] The present invention improves the assembly and disassembly performance of the pressure ring assembly 2 through the design of the positioning structure 202, realizes the quick locking and positioning of the pressure ring assembly 2 in the valve body 1 and the convenient disassembly and maintenance, solves the problems of cumbersome disassembly and assembly, poor locking and easy loosening and falling off of the pressure ring of traditional valves after long-term use, and forms a closed loop with the overall sealing structure, taking into account both sealing stability and maintenance convenience.

[0060] Furthermore, such as Figures 11 to 15 As shown, the bottom surface of the ejector groove 2024 of the present invention has six equally spaced annular insertion holes 2025. Six rotating rods 2026 are respectively inserted into the six insertion holes 2025. The rotating rods 2026 are used to insert into the insertion holes 2025 before the positioning plate 2022 extends, so as to push the positioning ring 2021 to move downward and rotate.

[0061] A sleeve is installed on the ejector ring 2023, and a convex ring is installed on the side wall of the sleeve. Six rotating rods 2026 are slidably connected to the convex ring and to the ejector ring 2023. All six rotating rods 2026 are installed on the turntable 2027, and the turntable 2027 is rotatably fitted with a threaded disc 2028, which is threadedly connected to the sleeve.

[0062] This invention utilizes a linkage structure of rotating rod 2026, turntable 2027, and threaded disc 2028. Six equidistant annular insertion holes 2025 are formed on the bottom surface of the ejector groove 2024. The six rotating rods 2026 are inserted into the six insertion holes 2025. The rotating rods 2026 serve as the pre-positioning drive. Before the ejector ring 2023 pushes the positioning plate 2022 out, the rotating rods 2026 are inserted into the insertion holes 2025. Through rotation and downward pressing, the positioning ring 2021 is simultaneously pressed downward and rotated circumferentially, thereby linking with the embedded ring 201 to complete the screw-in action. This ensures that the screw-in groove 2011 and screw-in protrusion 1081 are completely slid into place, and the insertion rod 107 is completely engaged in the slot 106. After pre-locking the sealing assembly, the positioning plate 2022 is ejected and fixed, preventing problems such as incomplete locking and residual sealing gaps caused by incorrect assembly sequence.

[0063] A sleeve is fixedly installed on the ejector ring 2023, and a convex ring is installed on the side wall of the sleeve. Six rotating rods 2026 are simultaneously slidably connected inside the convex ring and the ejector ring 2023 to achieve vertical guidance and circumferential linkage. The bottom ends of the six rotating rods 2026 are uniformly installed on the turntable 2027. The turntable 2027 rotates in conjunction with the threaded disc 2028, which is threadedly connected to the outer wall of the sleeve. By rotating the threaded disc 2028, the turntable 2027 and the rotating rods 2026 can be driven to rise and fall smoothly, controlling the insertion or disengagement of the rotating rods 2026 into the insertion hole 2025. Rotating the turntable 2027 can drive the rotating rods 2026 and the positioning ring 2021 to rotate synchronously. The entire structure realizes integrated control of rotation, pressing down and ejection. Pre-rotation positioning and locking operations can be completed with one hand without additional tools, greatly simplifying the assembly process.

[0064] This invention optimizes the assembly accuracy and ease of operation of the positioning structure 202 through the design of the linkage structure of the rotating rod 2026, the turntable 2027 and the threaded disc 2028. It realizes the step-by-step precise operation of first rotating for alignment and then ejecting for locking, and solves the problems of asynchronous screwing in and ejecting for locking of the pressure ring assembly 2 and the alignment deviation of the positioning plate 2022 during assembly. This makes the linkage locking of the entire pressure ring and sealing assembly smoother and more precise.

[0065] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A sealing-enhanced needle valve, characterized in that, Including valve body (1); The valve body (1) has a stuffing box (101) inside. The stuffing box (101) is composed of several cylindrical chambers, and the diameter of the several cylindrical chambers gradually increases from top to bottom. The top surface and bottom surface of the stuffing box (101) are respectively set as concave arc surface and convex arc surface. The stuffing box (101) is provided with a compression contact ring (102) at the top, a pressure-bearing contact ring (103) at the bottom, and a number of sealing packing rings (104) between the compression contact ring (102) and the pressure-bearing contact ring (103). The compression contact ring (102), the pressure-bearing contact ring (103) and the sealing packing ring (104) are all composed of a number of equally spaced annular sub-rings and a number of equally spaced annular sub-rings, and the number of sub-rings are respectively sleeved on the outer wall of the number of sub-rings through inclined surfaces. The top of several sub-rings of the compression contact ring (102) and several sub-rings of the sealing packing ring (104) are provided with insertion grooves (105), and the insertion grooves (105) are arc tracks arranged in the circumferential direction. The cross-sectional width of the insertion grooves (105) gradually shortens from the starting end to the ending end. The ending end of the insertion grooves (105) is provided with a slot (106), and the slot (106) is an arc groove arranged in the radial direction. The bottom of several sub-rings of the pressure-bearing contact ring (103) and several sub-rings of the sealing packing ring (104) are provided with insertion rods (107), and the insertion rods (107) are inserted into the insertion grooves (105). The sub-rings in the adjacent cylindrical chambers are deflected by 5-15°. The top of several sub-circles of the compression contact ring (102) are respectively provided with several ring plates (108).

2. A packing clamping device for a sealing-enhanced needle valve, applicable to the assembly of the sealing-enhanced needle valve as described in claim 1, characterized in that, Including the pressure ring assembly (2); The pressure ring assembly (2) includes an embedded ring (201) and a positioning structure (202). The embedded ring (201) is installed at the bottom end of the positioning structure (202), and the positioning structure (202) is detachably connected to the valve body (1). The embedded ring (201) is embedded into an annular cavity composed of several annular plates (108), and the bottom end of the embedded ring (201) is provided with an arc-shaped contact surface adapted to the pressure contact ring (102). Several inclined screw-in grooves (2011) are provided equidistantly in annular arrangement on the side wall of the embedded ring (201). Several screw-in protrusions (1081) are slidably connected in several screw-in grooves (2011), and several screw-in protrusions (1081) are provided equidistantly in annular arrangement on the inner wall of several annular plates (108).

3. The packing clamping device for a sealing-enhanced needle valve according to claim 2, characterized in that, Both sides of the screw-in groove (2011) and the screw-in protrusion (1081) are provided with matching oblique concave surfaces. The oblique concave surfaces are used to apply an outward force to the screw-in protrusion (1081) when the screw-in groove (2011) is screwed into the screw-in protrusion (1081), so that the plug rod (107) can move toward the slot (106).

4. The packing clamping device for a sealing-enhanced needle valve according to claim 3, characterized in that, The bottom end of the embedded ring (201) is also provided with an annular positioning block (2012), and the cross section of the positioning block (2012) is a trapezoidal surface. The positioning block (2012) is embedded in an annular groove composed of several positioning grooves (1021). Several positioning grooves (1021) are respectively opened on the top of several sub-rings of the pressing contact ring (102).

5. The packing clamping device for a sealing-enhanced needle valve according to claim 4, characterized in that, The positioning block (2012) is made of a material with a low coefficient of thermal expansion. The positioning block (2012) is used to automatically compensate for the axial and radial relaxation gaps of the packing by utilizing the expansion difference under high temperature conditions.

6. The packing clamping device for a sealing-enhanced needle valve according to claim 2, characterized in that, The positioning structure (202) includes a positioning ring (2021), a positioning plate (2022), and an ejection ring (2023). The positioning ring (2021) is located above the embedded ring (201). Several positioning plates (2022) are equidistantly and circumferentially slidably connected to the side wall of the positioning ring (2021). The ejection ring (2023) is inserted into the positioning ring (2021). Several positioning plates (2022) are respectively inserted into several fixing grooves (109), and several fixing grooves (109) are equidistantly and circumferentially opened on the inner wall of the valve body (1). The ejection ring (2023) is used to eject the positioning plate (2022) onto the fixing groove (109).

7. The packing clamping device for a sealing-enhanced needle valve according to claim 6, characterized in that, The positioning plates (2022) are divided into upper and lower groups, and both groups of positioning plates (2022) are inclined. The inclination directions of the two groups of positioning plates (2022) are opposite, and the head end of the positioning plate (2022) is set as a trapezoidal end.

8. The packing clamping device for a sealing-enhanced needle valve according to claim 7, characterized in that, The top of the positioning ring (2021) is provided with an ejection groove (2024), and the ejection groove (2024) is adapted to the ejection ring (2023). The cross section of the ejection groove (2024) is set as a trapezoidal surface, and the rear ends of the plurality of positioning plates (2022) are adapted to the ejection ring (2023).

9. The packing clamping device for a sealing-enhanced needle valve according to claim 8, characterized in that, The bottom surface of the ejector slot (2024) is provided with a plurality of insertion holes (2025) at equal intervals. A plurality of rotating rods (2026) are inserted into the plurality of insertion holes (2025). The rotating rods (2026) are used to be inserted into the insertion holes (2025) before the positioning plate (2022) extends out, so as to push the positioning ring (2021) to move downward and rotate.

10. The packing clamping device for a sealing-enhanced needle valve according to claim 9, characterized in that, A sleeve is installed on the ejector ring (2023), and a convex ring is installed on the side wall of the sleeve. Several rotating rods (2026) are slidably connected to the convex ring, and several rotating rods (2026) are slidably connected to the ejector ring (2023). Several rotating rods (2026) are installed on a turntable (2027), and the turntable (2027) is rotatably fitted with a threaded disc (2028), which is threadedly connected to the sleeve.

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