Packing pressing sleeve and sealing structure of adjusting angle valve for coal chemical industry

Abstract

The utility model relates to the technical field of angle valve sealing for coal chemical industry, in particular to a packing pressing sleeve and sealing structure of an adjusting angle valve for coal chemical industry, which comprises a pressing sleeve body with an axial through hole in the middle. The packing structure comprises a packing pressing plate, a packing box, sealing packing, a valve rod and a packing pressing sleeve. The sealing pressing sleeve is reasonable and compact in structure and convenient to use, double sealing is achieved between the sealing pressing sleeve and the valve rod through the sealing ring installed in the sealing ring installation groove and the sealing grease filled in the spiral sealing groove, and a single-stage sealing structure between the stuffing box of the adjusting angle valve and the valve rod is upgraded to a triple sealing structure. The sealing effect between the adjusting angle valve and the valve rod is effectively enhanced; the sealing grease in the spiral sealing groove can effectively lubricate the valve rod, the friction coefficient of the valve rod is reduced, and the abrasion degree between the filler and the valve rod is reduced; through the composite wear-resistant layers arranged on the inner side of the pressing sleeve body and the outer side of the valve rod, the wear resistance of the inner wall of the pressing sleeve body is enhanced, and the erosion resistance of the pressing sleeve body is improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for angle valves used in coal chemical industry, and is a packing sleeve and sealing structure for regulating angle valves used in coal chemical industry. Background Technology

[0002] Black water angle valves (also known as black water angle valves or black water regulating valves, hereinafter referred to as regulating angle valves) are used in the flash evaporation and ash water treatment systems of the Texaco coal-water slurry gasification process. Their main function is to regulate the level and reduce the pressure of black water from the bottom of the gasifier and scrubbing tower during flash evaporation, thereby lowering the black water temperature, releasing dissolved gases, and concentrating the black water. Due to their long-term use in a three-phase flow medium with a large inlet-outlet pressure difference, and under conditions of high temperature, large pressure drop, high ash content, and strong corrosiveness, the valve stem continuously wears down the polytetrafluoroethylene (PTFE) packing during prolonged reciprocating motion. This wear widens the gap between the valve stem and the PTFE packing to 0.05 mm-0.1 mm, creating a "micron pump effect" that draws in solid particles, leading to packing seal failure (leakage rate > 0.8 L / min).

[0003] Traditional valve stem packing systems lack lubrication between the valve stem and packing, resulting in prolonged dry friction with a coefficient of friction ranging from 0.15 to 0.18. When solid particles from black water intrude between the valve stem and packing, they continuously abrade and wear the stem during its reciprocating motion, creating furrows or grooves on its surface (i.e., furrow wear, with an annual wear rate > 0.3 mm). Furthermore, these intruding particles accumulate scale (annual deposition thickness > 2 mm) in the gap between the valve stem and packing, causing valve jamming and increasing opening and closing torque (up to 40%).

[0004] Therefore, the existing packing sleeve and sealing structure of the black water angle control valve used in the Texaco coal-water slurry gasification process have the following shortcomings in actual use: the sealing effect of the single-stage dynamic seal is poor, making the angle valve prone to leakage; the lack of a lubrication structure between the packing sleeve and the valve stem leads to increased friction and wear between the two; and the existing packing sleeve has insufficient erosion resistance. Summary of the Invention

[0005] This utility model provides a packing sleeve and sealing structure for a regulating angle valve used in coal chemical industry, overcoming the shortcomings of the prior art. It can effectively solve the problems of the lack of lubrication structure between the packing sleeve and valve stem in the existing black water angle regulating valve, which leads to increased friction and wear between the two and poor sealing effect of single-stage dynamic seal, making the angle valve prone to leakage. It further solves the problem of insufficient erosion resistance of the existing packing sleeve.

[0006] One of the technical solutions of this utility model is achieved through the following measures: a packing sleeve for a regulating angle valve for coal chemical industry, comprising a sleeve body with an axial through hole in the middle, the axial through hole being used to pass through the valve stem; at least one sealing ring mounting groove is provided on the upper inner side of the sleeve body, an oil guiding inner ring groove is provided from the middle to the lower inner side of the sleeve body, a spiral sealing groove is provided on the sleeve body corresponding to the bottom position of the oil guiding inner ring groove, and an oil injection port is provided on the upper left outer side of the sleeve body, which is inclined in the shape of upper left and lower right and whose inner end is connected to the inner side of the upper end of the spiral sealing groove.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] An oil injection valve for injecting lubricating grease into the spiral sealing groove can be fixedly installed inside the aforementioned oil injection port.

[0009] The upper inner side of the above-mentioned pressure sleeve body may be provided with O-ring installation grooves and wedge-shaped sealing ring installation grooves at intervals.

[0010] The upper end of the aforementioned pressure sleeve body can be in the shape of a frustum, which is smaller at the top and larger at the bottom.

[0011] The inner side of the aforementioned pressure sleeve body may be provided with a first composite wear-resistant layer.

[0012] The aforementioned spiral sealing groove can be a rectangular threaded sealing groove.

[0013] The aforementioned spiral sealing groove can be divided into upper and lower sections, with opposite rotation directions.

[0014] The second technical solution of this utility model is achieved through the following measures: A sealing structure for a regulating angle valve for coal chemical industry includes a packing pressure plate, a stuffing box, sealing packing, a valve stem, and a packing sleeve. The stuffing box has a valve hole that runs vertically through the middle, and the valve stem is fitted inside the valve hole. The upper inner side of the stuffing box has a packing cavity, and the packing cavity has a sealing packing and a packing sleeve that can be fitted onto the outside of the valve stem, arranged sequentially from bottom to top. The upper end of the packing sleeve is located above the stuffing box. A sealing ring is provided between each sealing ring mounting groove and the valve stem. A packing pressure plate that can be fitted onto the outside of the valve stem is provided on the upper side of the packing sleeve. The packing pressure plate and the upper side of the stuffing box are fixed together by threaded fasteners.

[0015] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0016] A second composite wear-resistant layer may be provided on the outer side of the valve stem;

[0017] The distance between the bottom of the inner annular groove of the oil guide and the outer side of the valve stem can be 0.1 mm to 0.2 mm.

[0018] This utility model features a reasonable and compact structure, and is easy to use. It achieves a double seal between the sealing sleeve and the valve stem through a sealing ring installed in the sealing ring mounting groove and sealing grease filled in the spiral sealing groove. This upgrades the single-stage sealing structure between the stuffing box and valve stem of the regulating angle valve to a triple-sealing structure, effectively enhancing the sealing effect between the regulating angle valve and the valve stem. This prevents black water leakage or intrusion between the stuffing box and valve stem, and also prevents particles in the black water from abrading the valve stem surface. The sealing grease in the spiral sealing groove also effectively lubricates the valve stem, reducing the valve stem's friction coefficient and decreasing the wear between the stuffing box and the valve stem. Furthermore, the composite wear-resistant layer located on the inner side of the sleeve body and the outer side of the valve stem enhances the wear resistance of the inner wall of the sleeve body and improves the erosion resistance of the sleeve body, allowing the sealing sleeve to better adapt to high-solids-content media conditions. Attached Figure Description

[0019] Appendix Figure 1 This is a schematic diagram of the main sectional view of embodiments 1-10 of this utility model.

[0020] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the three-dimensional structure.

[0021] Appendix Figure 3 This is a schematic diagram of the main sectional view of embodiments 8-10 of this utility model.

[0022] The codes in the attached diagram are as follows: 1 is the axial through hole, 2 is the pressure sleeve body, 3 is the valve stem, 4 is the inner ring groove for oil guide, 5 is the spiral sealing groove, 6 is the oil injection port, 7 is the oil injection valve, 8 is the O-ring installation groove, 9 is the wedge sealing groove, 10 is the packing pressure plate, 11 is the stuffing box, 12 is the sealing packing, 13 is the threaded fastener, 14 is the O-ring, and 15 is the wedge sealing ring. Detailed Implementation

[0023] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0024] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0025] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0026] Example 1: As shown in the attached document Figure 1 , 2As shown in Figure 3, the packing sleeve of the regulating angle valve for coal chemical industry includes a sleeve body 2 with an axial through hole 1 in the middle, the axial through hole 1 being used to pass through the valve stem 3; the upper inner side of the sleeve body 2 is provided with at least one sealing ring mounting groove, the middle to lower inner side of the sleeve body 2 is provided with an oil guiding inner ring groove 4, the sleeve body 2 is provided with a spiral sealing groove 5 corresponding to the bottom position of the oil guiding inner ring groove 4, and the upper left outer side of the sleeve body 2 is provided with an oil injection port 6 that is inclined in the shape of upper left and lower right and whose inner end is connected to the inner side of the upper end of the spiral sealing groove 5.

[0027] In the above technical solution, the valve stem 3 passes through the axial through hole 1 and is connected to the valve core. The valve core and the valve seat cooperate to control the flow rate of black water flowing through the angle valve.

[0028] Each sealing ring mounting groove can be fitted with a sealing ring, which can be an O-ring, a chemical wedge-shaped sealing ring, a lip-shaped sealing ring, or a combination sealing ring made of wear-resistant and high-temperature resistant elastic material, as is available in the prior art, so that a compression seal can be achieved between the inner side of the pressure sleeve body 2 and the outer side of the valve stem 3.

[0029] The inner annular groove 4 reduces the contact area between the pressure sleeve body 2 and the valve stem 3, reduces wear between them, and extends the service life of the valve stem 3. It can also store sealing grease to fully lubricate the outside of the valve stem 3. Furthermore, together with the spiral sealing groove 5 and the valve stem 3, it forms an oil reservoir for storing sealing grease. After the sealing grease is injected into the reservoir through the oil inlet 6, the spiral sealing groove 5 will also be filled with sealing grease. During the reciprocating movement of the valve stem 3, the sealing grease in the spiral sealing groove 5 forms a spiral seal with the valve stem 3. This allows for simultaneous extrusion sealing and spiral sealing between the packing sleeve and the valve stem 3, forming a progressive sealing barrier and enhancing the dynamic sealing performance between the valve stem 3 and the sealing sleeve.

[0030] In addition, the sealing grease adhering to the outside of the valve stem 3 can form a continuous lubricating film, improving the boundary lubrication conditions, so that the pressure sleeve body 2, the sealing ring and the packing in the angle valve can be fully lubricated, reducing the wear of the sealing ring and packing, extending the service life of the sealing ring and packing, reducing the intrusion of solid particles in black water between the packing and the valve stem 3, and avoiding the appearance of ploughing wear on the surface of the valve stem 3.

[0031] To facilitate the injection of sealing grease into the oil storage chamber, a one-way injection valve or nozzle can be installed in the injection port 6. Sealing grease is injected into the spiral sealing groove 5 and the oil storage chamber through the injection valve or nozzle. Alternatively, it can be directly connected to the lubrication pipeline via a pipe, using the sealing grease in the lubrication pipeline as lubricating oil. In this embodiment, lithium-based composite grease can be used as the sealing grease. Compared to the existing method of manually applying grease to the T-shaped pressure sleeve, the grease injection method of this device is simpler and more convenient, requires no machine downtime, and has higher operating efficiency.

[0032] Depending on the requirements, the thread type of the spiral sealing groove 5 can be a standard triangular thread, a sawtooth thread, a trapezoidal thread, a semi-circular thread, or a rectangular thread. To reduce friction between the outer wall of the valve stem 3 and the inner wall of the sealing sleeve, gaps are left between the inner side of the upper part and the inner side of the lower end of the sealing sleeve and the outer side of the valve stem 3. The gap between the inner side of the lower end of the sealing sleeve and the outer side of the valve stem 3 can also be sealed with sealing grease. The actual number of sealing ring mounting grooves can be determined based on the space dimensions of the inner side of the upper part of the sealing sleeve 2.

[0033] This utility model has a reasonable and compact structure and is easy to use. It can achieve a double seal between the sealing sleeve and the valve stem 3 through the sealing ring installed in the sealing ring mounting groove and the sealing grease filled in the spiral sealing groove 5. It can also set a triple seal between the stuffing box 11 of the regulating angle valve and the valve stem 3, which can effectively enhance the sealing effect between the regulating angle valve and the valve stem 3 and greatly reduce the probability of valve leakage. The sealing grease in the spiral sealing groove 5 can also effectively lubricate the valve stem 3, reduce the friction coefficient of the valve stem 3, and reduce the wear between the sealing packing 12 and the valve stem 3.

[0034] The packing sleeve of the above-mentioned regulating angle valve for coal chemical industry can be further optimized and / or improved according to actual needs:

[0035] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 , 3 As shown, an oil injection valve 7 for injecting lubricating grease into the spiral sealing groove 5 is fixedly installed inside the oil injection port 6.

[0036] In the above technical solution, the oil injection valve 7 can be a grease nipple (pressure oil cup), grease injector, or other one-way oil injection valve 7 that can be connected to the lubrication pipeline through a pipe. In this embodiment, the oil injection valve 7 is a one-way ball valve that is threaded into the oil injection port 6. The one-way ball valve includes a valve ball, a compression spring, a plug, and a valve body with an axial stepped hole in the middle. The outer end of the axial stepped hole is smaller than the inner end. A hexagonal wrench part is provided on the inner side of the outer end of the valve body. The valve ball, compression spring, and plug are arranged sequentially from the outside to the inside on the inner side of the larger end of the axial stepped hole. The plug has an axial through hole in the middle for sealing the passage of grease.

[0037] The oil injection valve 7 makes it easier for operators to inject high-temperature resistant lubricating oil or high-temperature resistant lubricating grease into the spiral sealing groove 5 to achieve spiral sealing. The oil injection valve 7, the sealing ring installed in the sealing ring mounting groove, and the packing installed in the packing gland 11 of the regulating angle valve can also seal the sealing grease in the oil storage chamber, effectively preventing external dust, moisture and other impurities from entering the oil storage chamber and avoiding contamination of the sealing grease.

[0038] Example 3: As an optimization of the above embodiments, as shown in the appendix Figure 1 , 2As shown in Figures 3 and 4, the upper inner side of the pressure sleeve body 2 is provided with O-ring mounting grooves 8 and wedge-shaped sealing ring mounting grooves 9 at intervals.

[0039] In the above technical solution, an O-ring 14 can be installed in the O-ring mounting groove 8. In this embodiment, the O-ring 14 can be pre-compressed by 25% before being installed in the O-ring mounting groove 8. A polytetrafluoroethylene (PTFE) wedge seal 15 can be installed in the wedge seal mounting groove 9. In this embodiment, a PTFE wedge seal from Wedge Seal can be selected, which can be interference-fitted into the wedge seal mounting groove 9, and the interference amount can be 0.3 mm.

[0040] With this configuration, two seals can be added between the upper part of the pressure sleeve body 2 and the valve stem 3, forming a progressive sealing barrier and achieving a better sealing effect.

[0041] Example 4: As an optimization of the above embodiments, as shown in the appendix Figure 1 , 2 As shown in Figures 1 and 3, the upper end of the pressure sleeve body 2 is a frustum-shaped cone with a smaller upper part and a larger lower part.

[0042] During use, a packing pressure plate 10 is provided on the upper side of the pressure sleeve body 2. The packing pressure plate 10 has a through hole in the middle for the valve stem 3 to pass through. Near the outer edge, the pressure plate has several vertically penetrating connecting holes. Each connecting hole contains a threaded fastener 13 for fastening to the stuffing box 11. Since the inner diameter of the connecting hole is usually larger than the outer diameter of the threaded fastener 13, the connecting hole and the valve stem 3 are not coaxial, making the valve stem 3 prone to wear. In the above technical solution, extending the upper end of the conical frustum of the pressure sleeve body 2 into the through hole improves the alignment of the pressure sleeve body 2, makes the connecting hole coaxial with the valve stem 3, prevents the packing pressure plate 10 from shifting, and avoids wear on the valve stem 3.

[0043] Example 5: As an optimization of the above embodiment, a first composite wear-resistant layer is provided on the inner side of the pressure sleeve body 2.

[0044] This design effectively enhances the wear resistance of the inner wall of the pressure sleeve body 2 and improves its erosion resistance, allowing the sealing pressure sleeve to better adapt to high-solids-content media conditions. In this embodiment, the first composite wear-resistant layer can be a hard alloy liner.

[0045] Example 6: As an optimization of the above embodiments, as shown in the appendix Figure 1 , 3 As shown, the spiral sealing groove 5 is a rectangular threaded sealing groove.

[0046] In the above technical solutions, the rectangular threaded sealing groove is easier to process and can effectively reduce processing costs.

[0047] Example 7: As an optimization of the above embodiment, the spiral sealing groove 5 is divided into upper and lower sections with opposite rotation directions.

[0048] With this configuration, during the reciprocating motion of the valve stem 3, the sealing grease is forced towards the center to form an oil seal, ensuring a reliable seal between the packing sleeve and the valve stem 3. This prevents leakage caused by a mismatch between the movement direction of the valve stem 3 and the oil-pushing direction of the spiral seal. To maintain stable sealing operation, a smooth section of a certain length can be provided between the two spiral sections.

[0049] Example 8: As attached Figure 3 As shown, the sealing structure of the regulating angle valve for coal chemical industry includes a packing pressure plate 10, a stuffing box 11, sealing packing 12, a valve stem 3, and a packing sleeve. The stuffing box 11 has a valve hole that runs vertically through the middle, and the valve stem 3 is fitted inside the valve hole. The upper inner side of the stuffing box 11 has a packing cavity, and the sealing packing 12 and the packing sleeve, which can be fitted onto the outside of the valve stem 3, are arranged sequentially from bottom to top in the packing cavity. The upper end of the packing sleeve is located above the stuffing box 11. Each sealing ring mounting groove is provided with a sealing ring between it and the valve stem 3. The upper side of the packing sleeve is provided with a packing pressure plate 10 that can be fitted onto the outside of the valve stem 3. The packing pressure plate 10 and the upper side of the stuffing box 11 are fixed together by threaded fasteners 13.

[0050] In the sealing structure of this utility model, in addition to the first layer of sealing between the stuffing box 11 and the valve stem 3 through the packing sleeve and sealing packing 12, a second layer of sealing can be set between the packing sleeve and the valve stem 3. That is, sealing grease is injected into the spiral sealing groove 5 through the oil injection port 6, so that a spiral seal can be formed between the inner side of the lower part of the sleeve body 2 and the outer side of the valve stem 3. A compression seal can also be formed between the inner side of the upper part of the sleeve body 2 and the outer side of the valve stem 3 through the sealing ring. The triple sealing can more effectively prevent black water in the regulating angle valve from seeping out from the gap between the valve stem 3 and the stuffing box 11, avoid the accumulation of scale in the gap between the packing sleeve and the valve stem 3, and better prevent solid particles in the black water from intruding between the valve stem 3 and the packing sleeve. This prevents solid particles from cutting and wearing the outer wall of the valve stem 3 during the reciprocating movement of the valve stem 3, thus preventing damage to the seal between the valve stem 3 and the stuffing box 11. The sealing grease filling the spiral sealing groove 5 and the inner oil guide groove 4 can continuously lubricate the valve stem 3, reduce the wear of the valve stem 3, and effectively extend the service life of the valve stem 3.

[0051] The sealing structure of the aforementioned regulating angle valve for coal chemical industry can be further optimized and / or improved according to actual needs:

[0052] Example 9: As an optimization of the above embodiment, a second composite wear-resistant layer is provided on the outer side of the valve stem 3.

[0053] This design further enhances the erosion and wear resistance of the outer wall of the valve stem 3. In this embodiment, the second composite wear-resistant layer can be a hard alloy layer.

[0054] Example 10: As an optimization of the above embodiments, as shown in the appendix Figure 3 As shown, the distance between the bottom of the inner annular groove 4 and the outer side of the valve stem 3 is 0.1 mm to 0.2 mm.

[0055] This configuration improves the sealing and lubrication between the sealing sleeve and valve stem 3.

[0056] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A packing sleeve for a regulating angle valve used in coal chemical industry, characterized in that... The pressure sleeve body includes a pressure sleeve body with an axial through hole in the middle, the axial through hole being used to pass through the valve stem; the upper inner side of the pressure sleeve body is provided with at least one sealing ring mounting groove, the middle to lower inner side of the pressure sleeve body is provided with an oil guiding inner ring groove, the pressure sleeve body is provided with a spiral sealing groove corresponding to the bottom position of the oil guiding inner ring groove, and the upper left outer side of the pressure sleeve body is provided with an oil injection port that is inclined in the shape of upper left and lower right and whose inner end is connected to the inner side of the upper end of the spiral sealing groove.

2. The packing sleeve of the regulating angle valve for coal chemical industry according to claim 1, characterized in that, An oil injection valve for injecting lubricating grease into the spiral sealing groove is fixedly installed inside the oil injection port.

3. The packing sleeve of the regulating angle valve for coal chemical industry according to claim 1 or 2, characterized in that, The upper inner side of the pressure sleeve body is provided with O-ring installation grooves and wedge-shaped sealing ring installation grooves at intervals.

4. The packing sleeve of the regulating angle valve for coal chemical industry according to claim 1 or 2, characterized in that, The upper end of the pressure sleeve body is shaped like a frustum, smaller at the top and larger at the bottom; Or / and, the inner side of the pressure sleeve body is provided with a first composite wear-resistant layer.

5. The packing sleeve of the regulating angle valve for coal chemical industry according to claim 3, characterized in that, The upper end of the pressure sleeve body is shaped like a frustum, smaller at the top and larger at the bottom; Or / and, the inner side of the pressure sleeve body is provided with a first composite wear-resistant layer.

6. The packing sleeve of the regulating angle valve for coal chemical industry according to claim 1, 2, or 5, characterized in that, The spiral sealing groove is a rectangular threaded sealing groove; Or / and, the spiral sealing groove is divided into upper and lower sections, with opposite rotation directions.

7. The packing sleeve of the regulating angle valve for coal chemical industry according to claim 3, characterized in that, The spiral sealing groove is a rectangular threaded sealing groove; Or / and, the spiral sealing groove is divided into upper and lower sections, with opposite rotation directions.

8. The packing sleeve of the regulating angle valve for coal chemical industry according to claim 4, characterized in that, The spiral sealing groove is a rectangular threaded sealing groove; Or / and, the spiral sealing groove is divided into upper and lower sections, with opposite rotation directions.

9. A sealing structure for a regulating angle valve used in coal chemical industry, characterized in that... The device includes a packing gland, a stuffing box, sealing packing, a valve stem, and a packing sleeve as described in any one of claims 1 to 8. The stuffing box has a valve hole that runs vertically through the center, and a valve stem is fitted inside the valve hole. The upper inner side of the stuffing box has a packing cavity, and a sealing packing and a packing sleeve that can be fitted onto the outside of the valve stem are arranged sequentially from bottom to top in the packing cavity. The upper end of the packing sleeve is located above the stuffing box. A sealing ring is provided between each sealing ring mounting groove and the valve stem. A packing gland is provided on the upper side of the packing sleeve that can be fitted onto the outside of the valve stem. The packing gland and the upper side of the stuffing box are fixed together by threaded fasteners.

10. The sealing structure of the regulating angle valve for coal chemical industry according to claim 9, characterized in that, A second composite wear-resistant layer is provided on the outer side of the valve stem; Or / and, the distance between the bottom of the inner annular groove of the oil guide and the outer side of the valve stem is 0.1 mm to 0.2 mm.

Images