Eccentric rotary valve

Abstract

The invention relates to the technical field of valves, in particular to an eccentric rotary valve which comprises a valve body, an upper valve rod, a lower valve rod rotationally arranged in the valve body and a valve element located in the valve body, the valve element is fixedly provided with an upper shaft diameter coaxially fixed to the upper valve rod and a lower shaft diameter coaxially fixed to the lower valve rod, and a valve seat and a limiting piece are arranged in the valve body; an upper stuffing box is arranged on the inner wall of the valve body, sealing stuffing is arranged on the inner wall of the valve body, an upper sliding bearing is jointly arranged on the peripheries, close to each other, of the upper shaft diameter of the upper valve rod and the upper shaft diameter of the valve element in a sleeving mode, and a stuffing pressing sleeve used for blocking a gap is fixedly arranged on the inner wall of an opening, facing the outside, of the upper stuffing box; the possibility that medium thrust borne by the valve element is conducted to the upper valve rod and the lower valve rod is effectively reduced, valve element position change caused by medium impact is greatly reduced, and the situation that the valve element deviates, and the valve rod additionally bears the medium thrust is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to an eccentric rotary valve. BACKGROUND

[0002] In the field of industrial fluid control, valves are indispensable key equipment for precisely regulating the flow, pressure and other parameters of the medium in the pipeline. Among them, rotary valves have significant advantages in many working conditions due to their unique structure and working principle. As an important type of rotary valve, the eccentric rotary valve can adapt to different fluid control requirements and has a wide application prospect in many industries such as chemical industry, petroleum industry and power industry. Its design aims to achieve more accurate and efficient control of medium flow to meet the complex and variable requirements of industrial production.

[0003] In the related art, referring to Figure 10 An eccentric rotary valve includes a valve body, a valve core located in the valve body, and a valve stem eccentrically fixed on the valve core. The valve core is generally hemispherical, and the inner wall of the valve body is provided with a valve seat capable of abutting against the valve core. The upper side of the valve body is provided with a mounting hole for the lower end of the valve stem to penetrate. The lower end of the valve stem extends to the outside of the valve body and is fixedly connected with the shaft diameter of the valve core. The upper end of the valve stem is fixedly provided with an actuator (such as a hand wheel or a servo motor). During operation, the actuator drives the valve core to rotate through the valve stem, thereby controlling the flow state of the medium in the pipeline and completing the opening and closing operation of the valve.

[0004] When the valve is connected to the material conveying pipeline and is blocked, the material impacts the concave surface of the valve core from the left inlet. At this time, the valve stem not only bears the driving torque applied by the actuator, but also bears the thrust generated by the medium in the pipeline. This makes the position of the valve core change with the change of the medium thrust, and cannot be stably maintained at the set position. Moreover, the medium thrust acting on the valve core is transmitted to the valve stem, which increases the static friction force between the valve stem and the inner wall of the valve body. This condition directly causes the driving torque of the valve stem to increase significantly when opening or closing the valve, which seriously affects the performance of the eccentric rotary valve, reduces its reliability and stability in actual industrial production, and needs to be improved. SUMMARY

[0005] The purpose of the present application is to provide an eccentric rotary valve to solve the problem of large valve stem driving torque in the related art described above, which affects the corresponding performance.

[0006] The eccentric rotary valve provided by the present application adopts the following technical scheme: The eccentric rotary valve comprises a valve body, an upper valve rod, a lower valve rod rotatingly arranged in the valve body, and a valve core arranged in the valve body, opposite sides of the valve core are coaxially and fixedly provided with an upper shaft diameter coaxially and fixedly connected with the upper valve rod and a lower shaft diameter coaxially and fixedly connected with the lower valve rod, an end of the upper valve rod away from the valve core extends to outside of the valve body; the valve body is provided with a valve seat and a limiting piece locking the valve seat; an upper packing box for the upper valve rod to pass through is arranged on an inner wall of the valve body, the valve body is provided with sealing packing arranged in the upper packing box, an outer periphery of the upper valve rod and the upper shaft diameter of the valve core is jointly sleeved with an upper sliding bearing with an outer periphery surface abutting against an inner wall of the upper packing box; a gap for the sealing packing to be arranged is arranged between the outer periphery surface of the upper valve rod and the inner wall of the upper packing box, and a packing pressing sleeve for blocking the gap is fixedly arranged on an opening inner wall of the upper packing box towards outside.

[0007] By adopting the above technical scheme, the upper and lower shaft diameters are coaxially arranged on opposite sides of the valve core and are coaxially and fixedly connected with the upper and lower valve rods respectively, the upper sliding bearing is limited by abutting against the inner wall of the upper packing box, stable bidirectional support of the valve core is formed, no matter which side of the valve body the medium impacts on the valve core, the possibility of the medium thrust received by the valve core being conducted to the upper and lower valve rods can be effectively reduced, the valve core position change caused by the medium impact is greatly reduced, and the valve core deviation is avoided to make the valve rod additionally bear the medium thrust. Meanwhile, the upper sliding bearing can reduce the friction between the upper valve rod and the valve body, the lower valve rod assists the valve core to stably rotate, the static friction force between the valve rod and the inner wall of the valve body is significantly reduced, and then the driving torque required for opening and closing of the valve is greatly reduced, and the operation convenience is improved.

[0008] Optionally, the upper shaft diameter of the valve core is fixedly connected with the upper valve rod through a bolt, and the lower shaft diameter of the valve core is fixedly connected with the lower valve rod through a bolt.

[0009] By adopting the above technical scheme, the bolt connection is convenient for accurate alignment during installation, and provides convenience for separate dismounting and replacement of the valve core or the valve rod in subsequent maintenance, without the need of replacing the whole component, so that the maintenance cost and difficulty are reduced, and the use cost performance and service life of the valve are indirectly improved.

[0010] Optionally, a lower packing box for the lower valve rod to insert is arranged on the inner wall of the valve body, a cover plate for blocking the opening of the lower packing box is fixedly arranged on the outside of the valve body; a lower sliding bearing is jointly sleeved on the outer periphery of the lower valve rod and the lower shaft diameter close to each other, an outer periphery surface of the lower sliding bearing abuts against the inner wall of the lower packing box, and an upper stepped groove for limiting the upper sliding bearing is arranged on the upper shaft diameter of the valve core; an installation recess is arranged on the inner side surface of the cover plate, and a positioning steel ball is arranged in the installation recess; a first positioning groove for the lower part of the positioning steel ball to be clamped is arranged on the bottom side of the installation recess, and a second positioning groove for the upper part of the positioning steel ball to be clamped is arranged on the end surface of the lower valve rod.

[0011] By adopting the technical scheme, the lower stuffing box provides installation space for the lower valve rod, and the cover plate prevents impurities from entering; the positioning steel ball cooperates with the upper stepped groove to limit the valve core, the lower valve rod and the upper valve rod and reduce the friction with the corresponding stuffing box, thereby reducing the wear of the valve rod. Meanwhile, the positioning steel ball is clamped into the first positioning groove of the cover plate and the second positioning groove of the lower valve rod to accurately position the lower valve rod, limit the rotation deviation of the lower valve rod, further improve the rotation stability of the valve core, reduce the position change of the valve core under the impact of the medium, assist in reducing the opening and closing driving torque of the valve rod, and enhance the lower side sealing protection, thereby ensuring the overall operation reliability of the valve.

[0012] Optionally, the upper end of the lower valve rod is fixedly provided with a lower spline shaft which is detachably connected with the lower shaft diameter, and a lower tool withdrawal groove is formed on the outer periphery of the lower valve rod close to the lower spline shaft, and a lower spacer sleeve is sleeved in the lower tool withdrawal groove.

[0013] By adopting the technical scheme, the lower spline shaft realizes detachable connection between the lower valve rod and the lower shaft diameter, which can ensure synchronous rotation of the two to stabilize power transmission and facilitate disassembly of components during subsequent maintenance, thereby reducing maintenance difficulty. The lower tool withdrawal groove provides an installation position for the lower spacer sleeve, and the outer periphery of the lower spacer sleeve is in abutment with the inner wall of the lower sliding bearing, which can fill the gap at the lower tool withdrawal groove, avoid shaking of the lower sliding bearing due to the gap, reduce direct friction between the lower valve rod and the lower sliding bearing, reduce component wear, further improve the rotation stability of the lower valve rod, ensure the eccentric rotation accuracy of the valve core, and assist in stable regulation of the medium flow of the valve.

[0014] Optionally, a side surface of the valve seat facing the valve core is fixedly provided with an abutting ring, and an arc convex surface capable of abutting against the abutting ring away from the side surface of the valve seat is arranged on the valve core; an accommodation ring groove is formed on the outer periphery of the abutting ring, and an elastic sealing ring is sleeved on the inner wall of the accommodation ring groove.

[0015] By adopting the technical scheme, the abutting ring is arranged on the side surface of the valve seat facing the valve core, and the arc convex surface abutting against the abutting ring is arranged on the valve core, and the sealing is realized by directly abutting, which discards the traditional structure design of relying on elastic elements such as springs and disc springs to elastically abut against the valve seat. The installation space of the elastic element is prevented from being entered by foreign matters such as particulate matters and crystalline bodies in the medium, the sealing performance of the abutting state of the valve seat and the valve core is prevented from being affected by foreign matters, the adjustment accuracy and stability of the valve when facing the medium containing particulate matters and crystalline bodies are improved, and the service life of the valve is prolonged; the elastic sealing ring can tighten the abutting ring, reduce the possibility of damage of the abutting ring due to deformation, prolong the service life of the abutting ring, and reduce the maintenance and replacement cost of the valve.

[0016] Optionally, the limiting member comprises a limiting pressure ring located on the side of the valve seat away from the valve core, and a limiting block ring fixed to the inner wall of the valve body, the limiting pressure ring is detachably installed on the inner wall of the valve body, and the opposite sides of the valve seat are respectively in abutment with the opposite sides of the limiting pressure ring and the limiting block ring.

[0017] By adopting the above technical scheme, when the valve seat is worn or needs to be maintained, the valve seat can be easily taken out by only detaching the limiting pressure ring, without the need to disassemble the entire valve, thereby reducing the difficulty and cost of maintenance and improving the efficiency of maintenance. When the valve is in a closed state, the sealing water line can effectively enhance the sealing effect between the valve seat and the limiting block ring, further preventing leakage of the medium from the gap between the valve seat and the valve body.

[0018] Optionally, the valve body is provided with a plurality of locking bolts, the limiting pressure ring is provided with locking screw holes for the locking bolts to be screwed into, and the end of the locking bolt towards the valve core can be in abutment with the side of the valve seat away from the valve core.

[0019] By adopting the above technical scheme, a plurality of locking bolts are provided and screwed into the locking screw holes of the limiting pressure ring, and the end of the locking bolt can be in abutment with the side of the valve seat away from the valve core, which greatly enhances the stability of the installation of the valve seat. During the operation of the valve, the valve seat will be impacted by the medium and subjected to frequent forces from the valve core. The locking bolt can effectively prevent the valve seat from loosening or shifting by abutting against the valve seat, ensure that the valve seat is always in the correct installation position, and guarantee the good sealing and cooperation between the valve seat and the valve core, thereby ensuring the accuracy and stability of the valve in regulating the flow of the medium.

[0020] Optionally, a fixed protruding ring is fixed to the inner edge of the side of the valve seat away from the abutment ring, and the outer circumferential surface of the fixed protruding ring can be in abutment with the inner side of the limiting block ring.

[0021] By adopting the above technical scheme, the abutment and cooperation of the fixed protruding ring and the limiting block ring provide additional support and positioning for the valve seat, effectively prevent the valve seat from shaking or shifting under complex working conditions, ensure that the sealing and cooperation between the valve seat and the valve core always remain good, and guarantee the accuracy of the valve in regulating the flow of the medium. At the same time, this structure enhances the overall structural strength of the valve, so that it can better withstand the pressure and impact of the medium, prolonging the service life of the valve.

[0022] Optionally, an arc-shaped concave surface is provided on the side of the fixed protruding ring away from the valve seat, the abutment ring can be installed to rotate to the side away from the valve core, the arc-shaped concave surface on the fixed protruding ring can be in abutment with the arc-shaped concave surface on the valve core at this time, and the outer circumferential surface of the abutment ring can be in abutment with the inner side of the limiting pressure ring at this time.

[0023] By adopting the technical scheme, the side of the fixed convex ring away from the valve seat is provided with an arc-shaped concave surface, and the abutting ring can be installed to the side away from the valve core by turning over the valve seat, so that the arc-shaped concave surface on the fixed convex ring abuts against the arc-shaped convex surface on the valve core. This design enhances the sealing performance of the valve under special working conditions. When there are many particles in the conveying medium, this turning over installation mode can change the sealing position, so that the arc-shaped concave surface and the arc-shaped convex surface are tightly matched, effectively block the medium leakage, and protect the valve adjustment accuracy. At the same time, the outer circumferential surface of the abutting ring abuts against the inner side surface of the limiting pressure ring, further improving the stability of the valve seat installation, preventing the valve seat from shaking and affecting the sealing effect. This flexible installation mode makes the valve better adapt to different media and working conditions, and widens the application range of the valve.

[0024] Optionally, an extension sleeve is fixed on the side of the fixed convex ring facing the valve seat, the distance between the fixed convex ring and the valve seat can be adjusted and fixed, an outer thread is arranged on the outer periphery of the extension sleeve, and an inner thread for screwing the extension sleeve is arranged on the inner side surface of the valve seat.

[0025] By adopting the technical scheme, in actual application, the distance between the fixed convex ring and the valve seat can be flexibly adjusted according to different working conditions and medium characteristics, and then the abutting degree of the arc-shaped concave surface and the arc-shaped convex surface is adjusted, the sealing effect is optimized, the valve can maintain good sealing performance in various complex environments, and medium leakage is effectively prevented. In addition, when the valve is used for a long time, if the sealing part is worn, the wear amount can be compensated by adjusting the distance, the sealing performance of the valve is restored, the service life of the valve is prolonged, and the maintenance cost is reduced.

[0026] In summary, the present application has the following beneficial technical effects: The upper and lower shaft diameters are coaxially arranged on the opposite sides of the valve core and are coaxially fixed with the upper and lower valve rods respectively, and cooperate with the abutment of the upper sliding bearing and the inner wall of the upper packing box and the limiting of the upper stepped groove to the upper sliding bearing to form stable bidirectional support to the valve core. Therefore, no matter which side of the valve body opening the medium impacts the valve core, the possibility of the medium thrust acting on the valve core being transmitted to the upper and lower valve rods can be effectively reduced, the valve core position change caused by medium impact can be greatly reduced, and the valve core deviation can be avoided to make the valve rod bear additional medium thrust. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any labor.

[0028] Figure 1 It is a whole structure schematic diagram of the embodiment 1 of the present application. Figure 2 is a sectional view structure schematic diagram of the valve seat mounting cooperation embodied in embodiment 1 of the present application; Figure 3 is Figure 2 is an enlarged schematic diagram of part A in Figure 4 is a partial sectional view structure schematic diagram of the upper valve rod mounting cooperation embodied in embodiment 1 of the present application; Figure 5 is a partial sectional view structure schematic diagram of the lower valve rod mounting cooperation embodied in embodiment 1 of the present application; Figure 6 is a sectional view structure schematic diagram of the valve seat mounting cooperation embodied in embodiment 2 of the present application; Figure 7 is Figure 6 is an enlarged schematic diagram of part B in Figure 8 is a partial sectional view structure schematic diagram of the fixed convex ring and valve seat mounting cooperation embodied in embodiment 3 of the present application; Figure 9 is a partial sectional view structure schematic diagram of the fixed convex ring and valve core abutting cooperation embodied in embodiment 3 of the present application; Figure 10 is a sectional view structure schematic diagram embodying the background art.

[0029] In the figure, 1, valve body; 11, upper stuffing box; 12, sealing packing; 13, packing pressing sleeve; 14, cover plate; 141, mounting sink; 142, first positioning groove; 15, positioning steel ball; 16, lower stuffing box; 17, upper spacer sleeve; 18, lower spacer sleeve; 2, valve core; 21, arc convex surface; 22, upper shaft diameter; 221, upper stepped groove; 23, lower shaft diameter; 231, lower stepped groove; 3, valve seat; 31, abutting ring; 311, let-in ring groove; 32, elastic sealing ring; 33, sealing water line; 4, limiting piece; 41, limiting stop ring; 42, limiting pressing ring; 421, locking screw hole; 43, locking bolt; 5, upper valve rod; 51, upper sliding bearing; 52, upper tool withdrawal groove; 6, lower valve rod; 61, lower sliding bearing; 62, second positioning groove; 63, first sealing ring; 64, lower tool withdrawal groove; 7, fixed convex ring; 71, extension sleeve; 72, arc concave surface. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with all the drawings.

[0031] Embodiment 1: Referring to Figure 1 and Figure 2An eccentric rotary valve comprises a valve body 1, an upper valve rod 5, a lower valve rod 6 and a valve core 2 located in the valve body 1, wherein the valve core 2 is coaxially fixed with upper and lower shaft diameters 22 and 23 on opposite sides, and the upper shaft diameter 22 of the valve core 2 is coaxially fixedly connected with the upper valve rod 5 through a bolt, and the lower shaft diameter 23 of the valve core 2 is coaxially fixedly connected with the lower valve rod 6 through a bolt; the valve core 2 can rotate around the axis of the upper valve rod 5, and the end of the upper valve rod 5 away from the valve core 2 extends to the outside of the valve body 1, and the outer end of the upper end can be installed with a corresponding pneumatic actuator (not shown in the figure); A valve seat 3 and a limiting piece 4 locking the valve seat 3 are arranged in the valve body 1, and an abutting ring 31 is integrally formed on the side of the valve seat 3 facing the valve core 2, wherein the valve core 2 is provided with an arc convex surface 21 capable of abutting against the abutting ring 31 away from the side of the valve seat 3; the abutting ring 31 is slightly deformed due to the extrusion of the valve core 2, so that the abutting position of the arc convex surface 21 and the abutting ring 31 is more stable; when the valve rod rotates, the valve core 2 makes eccentric rotary motion in the valve body 1, and the flow of the medium is adjusted by changing the flow area between the valve core 2 and the valve seat 3.

[0032] Referring to Figure 2 and Figure 3 , the limiting piece 4 comprises a limiting pressure ring 42 located on the side of the valve seat 3 away from the valve core 2, and a limiting stop ring 41 integrally formed on the inner wall of the valve body 1, wherein the outer periphery of the limiting pressure ring 42 is provided with external threads, and the inner wall of the valve body 1 is provided with internal threads for the outer periphery of the limiting pressure ring 42 to be screwed into; When the valve seat 3 is installed, first place the valve seat 3 in the valve body 1, so that the side of the valve seat 3 close to the abutting ring 31 abuts against one side of the limiting stop ring 41, and then screw the limiting pressure ring 42 into the inner wall of the valve body 1, so as to realize the detachable connection of the limiting pressure ring 42 and the inner wall of the valve body 1; after installation, the opposite sides of the valve seat 3 abut against the opposite sides of the limiting pressure ring 42 and the limiting stop ring 41 respectively.

[0033] Referring to Figure 3 , the side of the valve seat 3 facing the valve core 2 is integrally formed with a sealing water line 33; the valve body 1 is provided with a plurality of locking bolts 43, one end surface of the locking bolt 43 is provided with a hexagonal recess for the insertion of an internal hexagonal wrench, and the limiting pressure ring 42 is provided with a locking screw hole 421 for the locking bolt 43 to be screwed into; After the valve seat 3 is installed, the locking bolt 43 can be tightened using an internal hexagonal wrench, so that the end of the locking bolt 43 facing the valve core 2 abuts against the side of the valve seat 3 away from the valve core 2, and then the sealing water line 33 abuts against the side of the limiting stop ring 41 facing the limiting pressure ring 42.

[0034] Referring to Figure 4The inner wall of the valve body 1 is provided with an upper packing gland 11 for the upper valve rod 5 to pass through, and a sealing packing 12 is arranged in the upper packing gland 11. The outer periphery of the upper valve rod 5 and the upper shaft diameter 22 of the valve core 2 are jointly sleeved with an upper sliding bearing 51 whose outer periphery abuts against the inner wall of the upper packing gland 11. The upper shaft diameter 22 of the valve core 2 is provided with an upper stepped groove 221, and a gap of 0.5 mm exists between the bottom wall of the upper stepped groove 221 and the bottom surface of the upper sliding bearing 51. A gap for the sealing packing 12 to be placed in is arranged between the outer periphery of the upper valve rod 5 and the inner wall of the upper packing gland 11. The opening inner wall of the upper packing gland 11 is fixedly provided (screwed in through the cooperation of the inner and outer threads) with a packing pressing sleeve 13 for plugging the gap.

[0035] Referring to Figure 4 The lower end of the upper valve rod 5 is fixedly provided with an upper spline shaft (not shown in the figure) which is inserted into (anti-rotation) the upper shaft diameter 22. The outer periphery of the upper valve rod 5 close to the upper spline shaft is provided with an upper tool withdrawal groove 52, and the upper tool withdrawal groove 52 is sleeved with an upper spacer sleeve 17. The outer periphery of the upper spacer sleeve 17 abuts against the inner wall of the upper sliding bearing 51.

[0036] Referring to Figure 5 The inner wall of the valve body 1 is provided with a lower packing gland 16 for the lower valve rod 6 to be inserted into. The outer part of the valve body 1 is fixedly provided with a cover plate 14 for plugging the opening of the lower packing gland 16 through bolts. The outer periphery of the lower valve rod 6 close to the valve core 2 is fixedly sleeved with a lower sliding bearing 61 and movably sleeved with a plurality of first sealing rings 63 made of rubber. The lower shaft diameter 23 of the valve core 2 is provided with a lower stepped groove 231, and a gap of 0.5 mm exists between the bottom wall of the lower stepped groove 231 and the top surface of the lower sliding bearing 61. The inner side of the cover plate 14 is provided with a mounting recess 141 and a positioning steel ball 15. The bottom side of the mounting recess 141 is provided with a first positioning groove 142, and the end surface of the lower valve rod 6 is provided with a second positioning groove 62 coaxial with the first positioning groove 142. When the valve core 2 is installed, the lower valve rod 6 is first inserted into the lower packing gland 16, at which time the outer periphery of the lower sliding bearing 61 abuts against the inner wall of the lower packing gland 16. The steel ball is placed in the first positioning groove 142 of the cover plate 14, and then the cover plate 14 is installed on the valve body 1, with the upper part of the positioning steel ball 15 clamped into the second positioning groove 62 on the end surface of the lower valve rod 6. In this way, the positioning steel ball 15 further limits and supports the rotation of the lower valve rod 6, thereby improving the stability of the valve core 2 when it rotates.

[0037] Referring to Figure 5 The upper end of the lower valve rod 6 is fixedly provided with a lower spline shaft (not shown in the figure) which is inserted into (anti-rotation) the lower shaft diameter 23. The outer periphery of the lower valve rod 6 close to the lower spline shaft is provided with a lower tool withdrawal groove 64, and the lower tool withdrawal groove 64 is sleeved with a lower spacer sleeve 18. The outer periphery of the lower spacer sleeve 18 abuts against the inner wall of the lower sliding bearing 61.

[0038] The implementation principle of the embodiment of the present application is: When installing the valve core 2, the lower valve stem 6 is inserted into the lower stuffing box 16 of the valve body 1, the outer peripheral surface of the lower sliding bearing 61 abuts against the inner wall of the lower stuffing box 16, the positioning steel ball 15 is placed in the first positioning groove 142 of the cover plate 14, the cover plate 14 is installed so that the upper part of the positioning steel ball 15 is clamped into the second positioning groove 62 of the end surface of the lower valve stem 6, the rotation of the lower valve stem 6 is limited and abuts against the support; the upper valve stem 5 penetrates through the upper stuffing box 11 of the valve body 1, the outer peripheral surface of the upper sliding bearing abuts against the inner wall of the upper stuffing box 11, the sealing packing 12 is placed in the gap between the two, and the packing press sleeve 13 is used for plugging, and finally the pneumatic actuator is installed at the outer end of the upper valve stem 5; When installing the valve seat 3, the valve seat 3 is placed in the valve body 1 in advance, so that the side surface close to the abutting ring 31 abuts against the limiting stop ring 41, and then the limiting press ring 42 is screwed into the inner wall of the valve body 1 to realize detachable connection, and the installation of the valve seat 3 is completed. Then the lock bolt 43 is tightened by using an internal hex wrench, so that the end of the lock bolt 43 abuts against the valve seat 3, the sealing water line 33 abuts against the side surface of the limiting stop ring 41, and the sealing is guaranteed; When working, the pneumatic actuator drives the valve stem to rotate, the valve core 2 makes eccentric rotary motion in the valve body 1, and the medium flow is adjusted by changing the flow area between the valve core 2 and the valve seat 3; through the above setting, no matter which side of the valve body the medium flows from, the possibility that the medium thrust received by the valve core 2 is transmitted to the upper valve stem 5 and the lower valve stem 6 can be effectively reduced, and the reliability and stability of the eccentric rotary valve in actual industrial production are improved.

[0039] Embodiment 2: With reference to Figure 6 and Figure 7 The difference between the embodiment of the present application and embodiment 1 is that the outer periphery of the abutting ring 31 is provided with a make-way ring groove 311, and the inside of the make-way ring groove 311 is sleeved with an elastic sealing ring 32 made of rubber; the elastic sealing ring 32 is tightened on the abutting ring 31 to reduce the possibility of damage of the abutting ring 31 due to slight deformation.

[0040] Embodiment 3: With reference to Figure 8 The difference between the embodiment of the present application and embodiment 2 is that the inner diameter of the limiting press ring 42 is smaller than the inner diameter of the valve seat 3, and the side surface of the valve seat 3 away from the abutting ring 31 is provided with a fixed convex ring 7, wherein the side surface of the fixed convex ring 7 towards the valve seat 3 is integrally formed with an extension sleeve 71, the outer periphery of the extension sleeve 71 is provided with external threads, and the inner side surface of the valve seat 3 is provided with internal threads for the extension sleeve 71 to be screwed into; When the fixed convex ring 7 and the valve seat 3 are assembled, the extension sleeve 71 is screwed into the inner wall of the valve seat 3 to realize the installation and fixation of the fixed convex ring 7 and the valve seat 3; when the valve seat 3 is installed, the outer peripheral surface of the fixed convex ring 7 can abut against the inner side surface of the limiting pressure ring 42.

[0041] With reference to Figure 8 and Figure 9 , the side surface of the fixed convex ring 7 away from the valve seat 3 is provided with an arc-shaped concave surface 72; when the valve is connected to the pipeline conveying medium with more particles, because the impact of the medium on the abutting surface of the abutting ring 31 and the valve core 2 is larger, at this time, the valve seat 3 can be installed by turning 180°, so that the abutting ring 31 is turned to the side surface away from the valve core 2, and the arc-shaped concave surface 72 on the fixed convex ring 7 can abut against the arc-shaped concave surface 72 on the valve core 2 at this time, thereby enhancing the sealing performance of the valve in the closed state.

[0042] With reference to Figure 9 , the spacing between the fixed convex ring 7 and the valve seat 3 can be adjusted and fixed by the depth of the extension sleeve 71 screwed into the inner wall of the valve seat 3; at this time, the abutting degree of the arc-shaped concave surface 72 and the arc-shaped convex surface 21 can also be adjusted according to the actual needs by adjusting the spacing between the fixed convex ring 7 and the valve seat 3; When the fixed convex ring 7 is turned to the side surface facing the valve core 2 with the valve seat 3 and is fixed, the elastic sealing ring 32 sleeved on the abutting ring 31 can abut against the inner side surface of the limiting pressure ring 42 at this time, thereby reducing the possibility of corrosion of the medium on the abutting surface of the abutting ring 31 and the limiting pressure ring 42.

[0043] The implementation principle of the embodiment of the present application is: Normal application: first, screw the extension sleeve 71 of the fixed convex ring 7 into the inner side of the valve seat 3 to realize the assembly of the two. Then place the valve seat 3 on the valve body 1, so that the side surface close to the abutting ring 31 abuts against the limiting stop ring 41, screw in the limiting pressure ring 42 to complete the installation of the valve seat 3, and then tighten the locking bolt 43 with an internal hex wrench; at the same time, install the valve core 2 in the manner of embodiment 1, and finally install the pneumatic actuator on the outer end of the upper valve rod 5; when working, the pneumatic actuator drives the valve rod to rotate, and the valve core 2 performs eccentric rotary motion to adjust the medium flow by changing the flow area between the valve core 2 and the valve seat 3; Application when the medium contains more particles: install the valve seat 3 by turning 180°, so that the abutting ring 31 is turned to the side surface away from the valve core 2, and the arc-shaped concave surface 72 on the fixed convex ring 7 abuts against the arc-shaped convex surface 21 on the valve core 2 to enhance the sealing; at the same time, adjust the spacing between the fixed convex ring 7 and the valve seat 3 according to the needs to adjust the abutting degree; at this time, the elastic sealing ring 32 on the abutting ring 31 abuts against the inner side surface of the limiting pressure ring 42 to reduce the possibility of corrosion of the medium on the abutting surface of the abutting ring 31 and the limiting pressure ring 42.

[0044] Unless otherwise defined, the terms used in the present application shall be understood as follows: the terms used in the present application should be understood as having the meanings commonly used by those skilled in the art to which the present application pertains, unless otherwise defined. The terms "first", "second", "third" and the like used in the present application do not indicate any order, number or importance, but are used to distinguish different components. The terms "one" or "a" and the like do not indicate a quantity limitation, but indicate that there is at least one. The terms "include" or "contain" and the like mean that the elements or objects before the "include" or "contain" cover the elements or objects listed after the "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are used to represent relative positional relationships, which may change accordingly when the absolute positions of the described objects change.

[0045] The embodiments of the present specific implementation are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are indicated by the same reference numerals. Therefore, any equivalent changes made in the structure, shape, principle of the present application should be covered by the protection scope of the present application.

Claims

1. An eccentric rotary valve, comprising a valve body (1), an upper valve stem (5), a lower valve stem (6) rotatably disposed within the valve body (1), and a valve core (2) located within the valve body (1), wherein the valve core (2) is coaxially fixed on opposite sides with an upper shaft diameter (22) coaxially fixed with the upper valve stem (5) and a lower shaft diameter (23) coaxially fixed with the lower valve stem (6), and the end of the upper valve stem (5) away from the valve core (2) extends to the outside of the valve body (1); a valve seat (3) and a limiting member (4) for locking the valve seat (3) are provided inside the valve body (1); Its features are, The valve body (1) has an upper stuffing box (11) for the upper valve stem (5) to pass through, and a sealing packing (12) is provided inside the upper stuffing box (11). The upper valve stem (5) and the valve core (2) are close to each other on their outer circumferences, and an upper sliding bearing (51) with its outer circumferential surface abutting against the inner wall of the upper stuffing box (11) is provided. A gap is provided between the outer circumferential surface of the upper valve stem (5) and the inner wall of the upper stuffing box (11) for the sealing packing (12) to be inserted. A packing sleeve (13) for sealing the gap is fixed on the inner wall of the opening of the upper stuffing box (11) facing the outside.

2. An eccentric rotary valve according to claim 1, characterized in that, The upper shaft diameter (22) of the valve core (2) is fixedly connected to the upper valve stem (5) by bolts, and the lower shaft diameter (23) of the valve core (2) is fixedly connected to the lower valve stem (6) by bolts.

3. An eccentric rotary valve according to claim 1, characterized in that, The valve body (1) has a lower stuffing box (16) for inserting the lower valve stem (6) on its inner wall. The valve body (1) has a cover plate (14) fixed on its exterior to seal the opening of the lower stuffing box (16). The lower valve stem (6) and the lower shaft diameter (23) are fitted together on their outer peripheries, and the outer periphery of the lower sliding bearing (61) abuts against the inner wall of the lower stuffing box (16). The valve core (2) has an upper stepped groove (221) on its upper shaft diameter (22) to limit the upper sliding bearing (51); the inner side of the cover plate (14) has an installation groove (141) and a positioning steel ball (15) located in the installation groove (141); the bottom side of the installation groove (141) has a first positioning groove (142) for the lower part of the positioning steel ball (15) to be inserted; the end face of the lower valve stem (6) has a second positioning groove (62) for the upper part of the positioning steel ball (15) to be inserted.

4. An eccentric rotary valve according to claim 3, characterized in that, The upper end of the lower valve stem (6) is fixed with a lower spline shaft that is detachably connected to the lower shaft diameter (23). The lower valve stem (6) has a lower retraction groove (64) on its outer periphery near the lower spline shaft. A lower spacer (18) is sleeved inside the lower retraction groove (64). The outer periphery of the lower spacer (18) is in contact with the inner wall of the lower sliding bearing (61).

5. An eccentric rotary valve according to claim 1, characterized in that, A retaining ring (31) is fixed on the side of the valve seat (3) facing the valve core (2). The valve core (2) is provided with an arc-shaped convex surface (21) that can abut against the retaining ring (31) away from the side of the valve seat (3). A relief ring groove (311) is opened on the outer periphery of the retaining ring (311). An elastic sealing ring (32) is sleeved on the inner wall of the relief ring groove (311).

6. An eccentric rotary valve according to claim 5, characterized in that, The limiting component (4) includes a limiting pressure ring (42) located on the side of the valve seat (3) away from the valve core (2) and a limiting retaining ring (41) fixed on the inner wall of the valve body (1). The limiting pressure ring (42) is detachably installed on the inner wall of the valve body (1). The two opposite sides of the valve seat (3) abut against the two opposite sides of the limiting pressure ring (42) and the limiting retaining ring (41), respectively. A sealing water line (33) is fixed on the side of the valve seat (3) facing the valve core (2) and abuts against the side of the limiting retaining ring (41) facing the limiting pressure ring (42).

7. An eccentric rotary valve according to claim 6, characterized in that, The valve body (1) is provided with a number of locking bolts (43), and the limiting pressure ring (42) is provided with a locking screw hole (421) for the locking bolts (43) to be screwed in. The end of the locking bolt (43) facing the valve core (2) can be pressed against the side of the valve seat (3) away from the valve core (2).

8. An eccentric rotary valve according to claim 6, characterized in that, A fixed protruding ring (7) is fixed on the inner edge of the side of the valve seat (3) away from the abutment ring (31), and the outer peripheral surface of the fixed protruding ring (7) can abut against the inner side of the limiting stop ring (41).

9. An eccentric rotary valve according to claim 8, characterized in that, The fixed protruding ring (7) has an arc-shaped concave surface (72) on the side away from the valve seat (3); the abutting ring (31) can be rotated to the side away from the valve core (2) as the valve seat (3) flips and is installed. At this time, the arc-shaped concave surface (72) on the fixed protruding ring (7) can abut against the arc-shaped concave surface (72) on the valve core (2), and the outer peripheral surface of the abutting ring (31) abuts against the inner side of the limiting pressure ring (42).

10. An eccentric rotary valve according to claim 9, characterized in that, An extension sleeve (71) is fixed on the side of the fixed protrusion ring (7) facing the valve seat (3). The distance between the fixed protrusion ring (7) and the valve seat (3) can be adjusted and fixed. An external thread is provided on the outer periphery of the extension sleeve (71), and an internal thread is provided on the inner side of the valve seat (3) for the extension sleeve (71) to be screwed in.

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