Center intermediate rod sealing device
By designing a floating oil seal box and a water seal box in conjunction with a central intermediate rod sealing device for oil and water drain holes, the problem of lubricating oil and cooling water leaking out and invading inside the mud pump is solved, and a long-life sealing effect of the intermediate rod is achieved.
Patent Information
- Application Number
- CN202422485611.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-15
AI Technical Summary
After long-term operation, the existing mud pump center rod seal device will cause lubricating oil and cooling water to leak out or invade in due to wear and misalignment, affecting the service life and environment.
A central intermediate rod sealing device was designed, which included an oil seal assembly and a water seal assembly. The floating oil seal box and the floating water seal box followed the deviation of the intermediate rod, and combined with the oil drain hole, water drain hole and drainage hole, the lubricating oil and cooling water were effectively isolated and sealed.
Whether the center rod is centered or not, it can effectively seal to prevent lubricating oil leakage and cooling water intrusion, extend the service life of the center rod and prevent pollution.
Smart Images
Figure CN223387989U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drilling equipment, and more specifically to a central intermediate rod sealing device. Background Art
[0002] A mud pump consists of a power end and a hydraulic end, connected by a drawbar mechanism. The power end's crosshead, driven by the crankshaft-connecting rod mechanism, reciprocates back and forth between upper and lower guide plates on the power end's frame, driving the connected center rod back and forth. This, in turn, drives the piston rod and piston back and forth within the hydraulic end's cylinder sleeve, ultimately drawing in and pumping out drilling fluid under pressure. The connection between the center rod and the wall plate at the front of the power end relies on a skeleton packing. However, after prolonged operation, this packing wears out. Furthermore, wear of the crosshead within the guide plate causes it to sink, causing the center rod to become misaligned. This further damages the packing, allowing the power end's lubricating oil to leak out of the center rod and piston cooling water to seep into the center rod. This cooling water then enters the power end's oil sump, degrading the lubricating oil and further damaging power end components, shortening their service life. Furthermore, oil leakage not only causes oil loss but also harms the environment. There is currently a mud pump packing box, which consists of a box body, a pressure cover, a first double-lip oil seal, a second double-lip oil seal, a third double-lip oil seal, a floating oil seal ring, and an oil guide spacer. The box body, the first and second double-lip oil seals, and the floating oil seal ring are used to seal the lubricating oil; the third double-lip oil seal and the oil guide spacer are used to seal the cooling water. This solution can seal the lubricating oil when the center intermediate rod is centered. However, after the mud pump has been running for a long time, when the center intermediate rod is not centered, the center pull rod is sealed by only a floating oil seal ring and an O-ring. This sealing effect is not good enough and there is still the possibility of oil leakage. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a central intermediate rod sealing device, which can achieve effective sealing regardless of whether the central intermediate rod is centered or not, and realize more effective isolation of lubricating oil and cooling water, avoiding leakage, internal intrusion and mutual leakage, thereby increasing the service life of the central intermediate rod.
[0004] The utility model provides a central intermediate rod sealing device, which includes an oil seal assembly and a water seal assembly. The oil seal assembly includes an oil seal box body and a floating oil seal box sealed inside the oil seal assembly. The water seal assembly includes a water seal box body and a floating water seal box sealed inside the oil seal box. The oil seal box body is provided with an oil drainage hole, an oil seal connecting hole and an oil seal mounting hole. The lower end of the floating oil seal box is provided with an oil drain hole. The water seal box body is provided with a water drainage hole, a water seal connecting hole and a water seal mounting hole. The lower end of the floating water seal box is provided with a water drain hole. The oil seal connecting hole is used to be connected to the water seal connecting hole to realize an integrated connection between the oil seal assembly and the water seal assembly. The oil seal mounting hole is used to be connected to the water seal mounting hole and an installation object to realize the sealing of the central intermediate rod sealing device and the installation object.
[0005] Preferably, in the above-mentioned central intermediate rod sealing device, a first skeleton sealing packing and an oil seal spacer are further provided in the oil seal box body, and the oil seal spacer is located between the first skeleton sealing packing and the floating oil seal box.
[0006] Preferably, in the above-mentioned central intermediate rod sealing device, the floating oil seal box is further installed with a second skeleton sealing packing, and the inner diameter of the floating oil seal box is smaller than the outer diameter of the second skeleton sealing packing.
[0007] Preferably, in the above-mentioned central intermediate rod sealing device, the floating oil seal box is further installed with a third skeleton sealing packing, the inner diameter of the floating oil seal box is smaller than the outer diameter of the third skeleton sealing packing, and the third skeleton sealing packing and the second skeleton sealing packing are arranged parallel to each other in the floating oil seal box.
[0008] Preferably, in the above-mentioned central intermediate rod sealing device, a first sealing groove is opened on the outer periphery of the floating oil seal box, and a floating oil seal box sealing ring is sleeved in the first sealing groove, and the floating oil seal box sealing ring is used to achieve sealing between the outer periphery of the floating oil seal box and the inner wall of the oil seal box body to confine the oil in the oil seal box body.
[0009] Preferably, in the above-mentioned central intermediate rod sealing device, a fourth skeleton sealing packing and a water seal spacer ring are further provided in the water seal box body, and the water seal spacer ring is located between the fourth skeleton sealing packing and the floating water seal box.
[0010] Preferably, in the above-mentioned central intermediate rod sealing device, the floating water seal box is further installed with a fifth skeleton sealing packing, and the fifth skeleton sealing packing is in direct contact with the water seal spacer ring.
[0011] Preferably, in the above-mentioned central intermediate rod sealing device, a second sealing groove is provided on the outer periphery of the floating water seal box, and a floating water seal box sealing ring is provided in the second sealing groove, and the floating water seal box sealing ring is used to achieve sealing between the outer periphery of the floating water seal box and the inner wall of the water seal box body to confine water within the water seal box body.
[0012] Preferably, the above-mentioned center intermediate rod sealing device also includes an auxiliary mounting cylinder, the outer diameter of the auxiliary mounting cylinder is equal to the outer diameter of the center intermediate rod body, and the inner diameter is equal to the outer diameter of the thin head at the front end of the center intermediate rod. The auxiliary mounting cylinder can be inserted into the thin head at the front end of the center intermediate rod so that the auxiliary mounting cylinder contacts the center intermediate rod body and forms an integrated equal-diameter outer peripheral surface.
[0013] Preferably, in the above-mentioned center intermediate rod sealing device, the first end of the auxiliary mounting cylinder for contacting the main body of the center intermediate rod has a first rounded corner that matches the rounded corner of the front end of the main body of the center intermediate rod, and the second end away from the main body of the center intermediate rod is also provided with a second rounded corner.
[0014] It can be seen from the above technical solution that the above-mentioned center intermediate rod sealing device provided by the present invention, since the oil seal assembly includes an oil seal box body and a floating oil seal box sealed inside the oil seal box, the floating oil seal box can follow the deviation of the center intermediate rod to make corresponding movements to achieve sealing when the center intermediate rod is not centered, so that the lubricating oil can be effectively sealed whether the center intermediate rod is centered or not, and since the water seal assembly includes a water seal box body and a floating water seal box sealed inside the oil seal box, the floating water seal box can follow the deviation of the center intermediate rod to make corresponding movements to achieve sealing when the center intermediate rod is not centered, so that the lubricating oil can be effectively sealed whether the center intermediate rod is centered or not, and the oil seal box body has an oil drainage hole, an oil seal connecting hole and an oil seal mounting hole, and the lower end of the floating oil seal box has an oil drain hole, and the oil can be drained out by utilizing the cooperation of the oil drain hole and the oil drainage hole to avoid leakage, and the water seal box The body is provided with a water drainage hole, a water seal connecting hole and a water seal mounting hole. The lower end of the floating water seal box is provided with a drain hole. The cooperation of the drain hole and the water drainage hole can drain water out to avoid internal invasion and contamination of the lubricating oil. In addition, the oil seal connecting hole is used to connect with the water seal connecting hole to realize the integrated connection of the oil seal assembly and the water seal assembly, which can ensure effective sealing of the two and avoid oil and water from leaking into each other. Moreover, the above-mentioned oil seal mounting hole is used to connect with the above-mentioned water seal mounting hole and the installation object to realize the sealing of the center intermediate rod sealing device and the installation object, which can ensure a firm and sealed connection of the center intermediate rod sealing device and is not easy to fall off, thereby ensuring a long-term sealing effect. It can be seen that the center intermediate rod sealing device can achieve effective sealing regardless of whether the center intermediate rod is centered or not, and realize more effective isolation of lubricating oil and cooling water, avoiding leakage, internal invasion and mutual leakage, thereby increasing the service life of the center intermediate rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0016] Figure 1 A schematic diagram of an embodiment of a central intermediate rod sealing device provided by the present invention after overall installation;
[0017] Figure 2 An exploded view of the components of an embodiment of a central intermediate rod sealing device provided by the utility model;
[0018] Figure 3A schematic diagram of an oil seal box body of an embodiment of a central intermediate rod sealing device provided by the present invention;
[0019] Figure 4 A schematic diagram of a water seal box body of an embodiment of a central intermediate rod sealing device provided by the present invention;
[0020] Figure 5 A schematic diagram of a floating oil seal box of an embodiment of a central intermediate rod sealing device provided by the present invention;
[0021] Figure 6 This is a schematic diagram of a floating water seal box of an embodiment of a central intermediate rod sealing device provided by the present invention. DETAILED DESCRIPTION
[0022] The core of the utility model is to provide a central intermediate rod sealing device, which can achieve effective sealing regardless of whether the central intermediate rod is centered or not, and realize more effective isolation of lubricating oil and cooling water, avoiding leakage, internal intrusion and mutual flow, thereby increasing the service life of the central intermediate rod.
[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0024] The utility model provides a central intermediate rod sealing device. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, Figure 1 This is a schematic diagram of an embodiment of a central intermediate rod sealing device provided by the utility model after overall installation. Figure 2 This is an exploded view of the components of an embodiment of a central intermediate rod sealing device provided by the utility model. Figure 3 This is a schematic diagram of an oil seal box body of an embodiment of a central intermediate rod sealing device provided by the utility model. Figure 4 This is a schematic diagram of a water seal box body of an embodiment of a central intermediate rod sealing device provided by the utility model. Figure 5 This is a schematic diagram of a floating oil seal box according to an embodiment of a central intermediate rod sealing device provided by the present invention. Figure 6 This is a schematic diagram of a floating water seal box of an embodiment of a central intermediate rod sealing device provided by the present invention. Figure 1 It can be seen that the central intermediate rod sealing device can include an oil seal component 1 and a water seal component 2. Figure 2 It can be seen that the oil seal assembly 1 includes an oil seal box body 11 and a floating oil seal box 14 sealed therein. The oil seal box body 11 can be a cylindrical structure made by turning round steel, and its interior is processed into a cavity. The floating oil seal box 14 can also be a cylindrical structure made by turning round steel, and its outer diameter is clearance-matched with the internal cavity in the above-mentioned oil seal box body 11 to ensure that the floating oil seal box 14 can be smoothly installed in the cavity of the oil seal box body 11. The floating oil seal box 14 can follow the center intermediate rod to move when the center intermediate rod deviates to continue to oil The water seal assembly 2 includes a water seal box body 21 and a floating water seal box 24 sealed therein. The water seal box body 21 can be a cylindrical structure made by turning round steel, and the floating water seal box 24 can also be a cylindrical structure made by turning round steel. The floating water seal box 24 can follow the central intermediate rod to move and continue to seal the water when the central intermediate rod deviates. In this way, the water seal box body 21 can be compensated for the inability of the water seal box body 21 to move with the central intermediate rod, thereby Figure 3 It can be seen that the oil seal box body 11 has an oil drainage hole 11a, an oil seal connecting hole 11c and an oil seal mounting hole 11b. The oil seal connecting hole 11c and the oil seal mounting hole 11b are preferably located on the connecting flange at the end of the oil seal box body 11, and the oil drainage hole 11a is preferably located at the lower end surface of the oil seal box body 11. Figure 5 It can be seen that the lower end of the floating oil seal box 14 has an oil drain hole 14a. After installation, it is preferred to align the oil drain hole 14a with the oil drainage hole 11a to quickly drain the oil entering the floating oil seal box and the oil seal box body and discharge them into the power end oil pool. Of course, the two can also be misaligned. In this case, the oil in the floating oil seal box first enters the oil seal box body 11 through the oil drain hole 14a, and then flows into the oil drainage hole 11a under the action of gravity and is then discharged into the power end oil pool, thereby avoiding leakage into the water and causing pollution. Figure 4 It can be seen that the water seal box body 21 has a water drainage hole 21a, a water seal connection hole 21c and a water seal installation hole 21b. Figure 6It can be seen that the lower end of the floating water seal box 24 has a drain hole 24a, and the water seal connection hole 21c and the water seal installation hole 21b can preferably be located on the connecting flange at the end of the water seal box body 21. The connecting flange on the water seal box body should match the shape and size of the connecting flange at the end of the aforementioned oil seal box body. After the floating water seal box and the water seal box body are installed together, it is preferably ensured that the drain hole 24a is aligned with the water drainage hole 21a to quickly drain the cooling water entering the floating water seal box and the water seal box body into the trolley case water pool without residue or entering the oil. Of course, the two are not aligned. In the case of misalignment Under the present invention, the cooling water in the floating water seal box can first enter the water seal box body through the drain hole 24a, and then reach the water drainage hole under the action of gravity and drain from here to the trolley box water pool, so that the cooling water can be effectively prevented from entering the oil and causing pollution. The above-mentioned oil seal connecting hole 11c is used to connect with the above-mentioned water seal connecting hole 21c to realize the integrated connection of the oil seal assembly 1 and the water seal assembly 2. Specifically, bolts can be used for connection to ensure that there is a sufficiently good sealing effect between the two and there will be no oil and water cross-contamination. The above-mentioned oil seal mounting hole 11b is used to connect with the water seal mounting hole 21b and the installation object (for example Figure 1 and Figure 2 The power end wall plate 4) shown in the figure is connected to achieve the sealing of the central intermediate rod sealing device and the installation object. Specifically, bolt connection and fixing can be used to ensure that there is a sufficiently good sealing effect between the entire central intermediate rod sealing device and the installation object, and to avoid falling off, thereby ensuring that it has a sufficiently long service life.
[0025] It can be seen from the above technical solution that in the embodiment of the above-mentioned center intermediate rod sealing device provided by the present invention, since the oil seal assembly includes an oil seal box body and a floating oil seal box sealed inside the oil seal box, the floating oil seal box can follow the deviation of the center intermediate rod to move accordingly to achieve sealing when the center intermediate rod is not centered, so that the lubricating oil can be effectively sealed regardless of whether the center intermediate rod is centered or not. Moreover, since the water seal assembly includes a water seal box body and a floating water seal box sealed inside the oil seal box, the floating water seal box can follow the deviation of the center intermediate rod to move accordingly to achieve sealing when the center intermediate rod is not centered, so that the lubricating oil can be effectively sealed regardless of whether the center intermediate rod is centered or not. Moreover, the oil seal box body has an oil drainage hole, an oil seal connecting hole and an oil seal mounting hole, and the lower end of the floating oil seal box has an oil drain hole. By utilizing the cooperation of the oil drain hole and the oil drainage hole, the oil can be drained out to avoid leakage. The water seal box body is provided with a water drainage hole, a water seal connecting hole and a water seal mounting hole. The lower end of the floating water seal box is provided with a drain hole. The cooperation of the drain hole and the water drainage hole can drain water out to avoid internal invasion and contamination of the lubricating oil. In addition, the oil seal connecting hole is used to connect with the water seal connecting hole to realize the integrated connection of the oil seal assembly and the water seal assembly, which can ensure effective sealing of the two and avoid oil and water from leaking into each other. Moreover, the above-mentioned oil seal mounting hole is used to connect with the above-mentioned water seal mounting hole and the installation object to realize the sealing of the center intermediate rod sealing device and the installation object, which can ensure a firm and sealed connection of the center intermediate rod sealing device and is not easy to fall off, thereby ensuring a long-term sealing effect. It can be seen that the center intermediate rod sealing device can achieve effective sealing regardless of whether the center intermediate rod is centered or not, and realize more effective isolation of lubricating oil and cooling water, avoiding leakage, internal invasion and mutual leakage, thereby increasing the service life of the center intermediate rod.
[0026] In a specific embodiment of the above-mentioned central intermediate rod sealing device, continue to refer to Figure 2 The oil seal box body 11 is further provided with a first skeleton sealing packing 12 and an oil seal spacer 13, and the oil seal spacer 13 is located between the first skeleton sealing packing 12 and the floating oil seal box 14. Figure 3The inside of the oil seal box 11 can be processed into cavities 11d, 11e, and 11f of different diameters, wherein the diameter of 11f is greater than the diameter of 11e and greater than the diameter of 11d, 11d is clearance-matched with the center intermediate rod 5, the diameter of 11e is less than or equal to the diameter of the first skeleton sealing packing 12, and the diameter of 11f is clearance-matched with the outer diameter of the floating oil seal box 14. It should be noted that this first skeleton sealing packing 12 can better prevent the leakage of the liquid medium while allowing the normal movement of the equipment. When selecting a suitable skeleton sealing packing, it is necessary to consider the working conditions such as Considering the temperature, pressure, pH range, shaft speed, and media type, equipment installation requirements, such as the size and surface roughness of the stuffing box, are also important to ensure effective sealing and long packing life. In this embodiment, aramid fiber packing is preferred. Made of aramid fiber, it offers high strength and wear resistance, making it suitable for use in harsh abrasive slurries. PTFE packing, such as 5888 and 5889, can also be used, offering excellent chemical resistance. Other types of packing can also be selected based on practical needs, and this is not a limitation. Furthermore, the oil seal spacer 13 prevents friction between the floating oil seal box and the first skeleton seal packing, which could affect the sealing effect.
[0027] Based on the above specific embodiments, continue to refer to Figure 2 The floating oil seal box 14 can also be installed with a second skeleton sealing packing 15. The inner diameter of the floating oil seal box 14 is smaller than the outer diameter of the second skeleton sealing packing 15. When installing, the second skeleton sealing packing can be pressed into the floating oil seal box 14 with the help of external force, so that the two achieve an interference fit effect, thereby further enhancing the sealing performance. In further embodiments, continue to refer to Figure 2 The floating oil seal box 14 is also equipped with a third skeleton sealing packing 16. The inner diameter of the floating oil seal box 14 is smaller than the outer diameter of the third skeleton sealing packing 16. During installation, the third skeleton sealing packing 16 can be pressed into the floating oil seal box 14 with the help of external force, thus achieving an interference fit between the two. The third skeleton sealing packing 16 and the second skeleton sealing packing 15 are arranged parallel to each other in the floating oil seal box 14. The two are installed from the two sides of the floating oil seal box 14, thus forming an all-round seal inside the floating oil seal box. A certain gap exists between the second skeleton sealing packing 15 and the third skeleton sealing packing 16, which allows oil scraped off the center tie rod to flow out through this gap and the oil drain hole of the floating oil seal box.
[0028] In a further embodiment, continue to refer to Figure 2 and Figure 5A first sealing groove 14b is provided on the outer periphery of the floating oil seal box 14. This first sealing groove 14b must ensure that there is at least one circle around the outer wall of the floating oil seal box 14, and a floating oil seal box sealing ring 17 is provided in the first sealing groove 14b. The width and depth of the groove must match the size of the floating oil seal sealing ring 17. It can be a square groove or a circular groove, which is not limited here. The floating oil seal box sealing ring 17 is used to achieve a seal between the outer periphery of the floating oil seal box 14 and the inner wall of the oil seal box body 11 to confine the oil in the oil seal box body 11 to prevent it from overflowing into the water seal box body.
[0029] In another specific embodiment of the central intermediate rod sealing device, continue to refer to Figure 2 The water seal box body 21 may further include a fourth frame sealing packing 22 and a water seal spacer 23, and the water seal spacer 23 is located between the fourth frame sealing packing 22 and the floating water seal box 24. The fourth frame sealing packing 22 may be of the same type as the first frame sealing packing described above. The function of the water seal spacer 23 is to prevent friction between the floating water seal box 24 and the fourth frame sealing packing 22 and thereby affect the seal. In further embodiments, continue to refer to Figure 2 The floating water seal box 24 may also be equipped with a fifth skeleton sealing packing 25. The outer diameter of the fifth skeleton sealing packing 25 is preferably larger than the inner diameter of the floating water seal box 24 to achieve an interference fit between the two, thereby achieving a better sealing effect. The fifth skeleton sealing packing 25 is in direct contact with the water seal spacer ring 23, so that a better sealing effect can be formed between the floating water seal box 24 and the water seal box body 21. In a further embodiment, continue to refer to Figure 2 and Figure 6 A second sealing groove 24b is formed on the outer periphery of the floating water seal box 24, and a floating water seal box sealing ring 26 is sleeved in the second sealing groove 24b. The floating water seal box sealing ring 26 is used to achieve a seal between the outer periphery of the floating water seal box 24 and the inner wall of the water seal box body 21 to confine water in the water seal box body 21. The depth and width of the second sealing groove 24b must match those of the floating water seal box sealing ring 26. This second sealing groove 24b can be a square groove or a circular groove, which is not limited here.
[0030] Based on the various embodiments of the above-mentioned central intermediate rod sealing device, continue to refer to Figure 1 and Figure 2, it can also include an auxiliary mounting cylinder 3, the outer diameter of which is equal to the outer diameter of the main body of the center intermediate rod 5, and the inner diameter of which is equal to the outer diameter of the thin end of the front end of the center intermediate rod 5. The auxiliary mounting cylinder 3 can be inserted into the thin end of the front end of the center intermediate rod 5 so that the auxiliary mounting cylinder 3 and the main body of the center intermediate rod 5 come into contact and form an integrated equal-diameter outer peripheral surface. In other words, before installing the sealing device, the auxiliary mounting cylinder 3 and the center intermediate rod 5 are first installed together, thus forming an overall cylindrical equal-diameter outer peripheral surface. At this time, the sealing device is inserted and continued to move smoothly into the inside, so that the sealing device can be quickly and conveniently fixed to the installation object. In a further embodiment, the first end of the auxiliary mounting cylinder 3 for contacting the main body of the center intermediate rod 5 preferably has a first rounded corner that matches the rounded corner of the front end of the main body of the center intermediate rod 5, so that the two rounded corners complement each other so that there will be no hollow area at their positions, and the second end of the main body away from the center intermediate rod 5 is also provided with a second rounded corner. This second rounded corner can facilitate the insertion of the sealing device into the center intermediate rod. After all, the inclined surface formed by this second rounded corner can facilitate the insertion of the skeleton sealing packing, which has more advantages than a right-angled edge. The oil seal assembly and the water seal assembly are assembled together in advance and then installed as a whole, thereby saving installation time and improving installation efficiency compared to the traditional assembly method of baffles and retaining springs.
[0031] It should also be noted that the individual skeleton sealing packings used in the above-described embodiment can be annular double-lip sealing packings of the same size and specification, with an inner diameter less than or equal to the outer diameter of the main body of the center rod. This ensures that each skeleton sealing packing can be tightly wrapped around the center rod, thereby improving the sealing effect. This sealing device fully utilizes the limited space between the center rod, the piston rod fixing clamp, and the power end wall plate when the mud pump crosshead is at the bottom dead center position. The use of five skeleton sealing packings provides a better sealing effect, thereby extending the overall service life.
[0032] The following describes the assembly of the sealing device: When the mud pump has been running for a long time and the center intermediate rod skeleton seal needs to be replaced, first install and fix the second skeleton sealing packing 15 and the third skeleton sealing packing 16 in sequence into the floating oil seal box 14, install the fifth skeleton sealing packing 25 into the floating water seal box 24, and then install the floating oil seal box sealing ring 17 and the floating water seal box sealing ring 26. In this way, the floating oil seal box 14 and the floating water seal box 24 are assembled. Subsequently, the first skeleton sealing packing 12, the oil seal spacer 13, and the floating oil seal box 14 are installed into the oil seal box body 11 in sequence to assemble the oil seal assembly 1. Then, the fourth skeleton sealing packing 22, the water seal spacer 23, and the floating water seal box 24 are installed into the water seal box body 21 to assemble the water seal assembly 2. Finally, the oil seal assembly 1 and the water seal assembly 2 are detachably connected and fixed together through the connecting holes 11c and 21c to assemble into an integral central intermediate rod sealing device. This replaces the previous combination of baffles and retaining springs, making assembly more convenient and time-saving.
[0033] During installation, first place the auxiliary mounting cylinder 3 over the small end of the center intermediate rod 5, then insert the entire center intermediate rod sealing device into the auxiliary mounting cylinder 3. The sealing device is then pushed along the center intermediate rod 5 to the power end wall panel 4. The sealing device is then secured to the power end wall panel 4 through the mounting holes 11b and 21b, achieving quick installation. The first skeleton sealing packing 12 is fixedly mounted in the oil seal box 11, and the fourth skeleton sealing packing 22 is fixedly mounted in the water seal box 21, providing a fixed seal. The second and third skeleton sealing packings 15 and 16 are mounted in the floating oil seal box 14, and the fifth skeleton sealing packing 25 is mounted in the floating water seal box 24, providing a floating seal.
[0034] After installation, the center intermediate rod sealing device seals the center intermediate rod 5 through the first skeleton sealing packing 12, the second skeleton sealing packing 15 and the third skeleton sealing packing 16 in the floating oil seal box 14, the fifth skeleton sealing packing 25 and the fourth skeleton sealing packing 22 in the floating water seal box 24, thereby achieving oil and water blocking functions and preventing lubricating oil and cooling water from leaking out and invading the center intermediate rod 5 between the skeleton sealing packing and the center intermediate rod 5. The first skeleton sealing packing 12 and the floating oil seal box sealing ring 17, and the fourth skeleton sealing packing 22 and the floating water seal box sealing ring 26, achieve separation of the lubricating oil in the oil seal box body 11 and the cooling water in the water seal box body 21, preventing the cooling water from mixing with the lubricating oil, causing the lubricating oil to deteriorate and accelerating the wear of the power end components. The lubricating oil is returned to the power end oil sump through the drainage holes 11a of the oil seal box 11 and the oil discharge holes 14a of the floating oil seal box 14, preventing leakage of the lubricating oil. The cooling water is returned to the drawbar box through the drainage holes 21a of the water seal box 21 and the drain holes 24a of the floating water seal box 24, preventing cooling water from intruding into the drawbar box. The fixed first skeleton sealing packing 12 and the fourth skeleton sealing packing 22, the floating oil seal box sealing ring 17, and the floating water seal box sealing ring 26 achieve a secondary seal for the lubricating oil and cooling water, preventing leakage of the lubricating oil through the gaps between the oil seal box 11 and the outer walls of the first skeleton sealing packing 12 and the floating oil seal box 14, and preventing cooling water from intruding into the drawbar box through the gaps between the water seal box 21 and the outer walls of the fourth skeleton sealing packing 22 and the floating water seal box 24. For example, when the crosshead of the mud pump sinks and the center intermediate rod 5 is not centered, the floating effect of the second skeleton sealing tank packing 15 and the third skeleton sealing packing 16 of the floating oil seal box 14 and the fifth skeleton sealing packing 25 of the floating water seal box 24 realizes the third seal of the lubricating oil and cooling water, thereby avoiding the problem of lubricating oil and cooling water leaking out of the center intermediate rod 5 and invading the inside when the center intermediate rod 5 is not centered.
[0035] The sealing device utilizes the limited space between the center rod, piston rod clamp, and power end wall plate 4 when the mud pump crosshead is at bottom dead center. It employs five seals: a first skeleton packing 12, a second skeleton packing 15, a third skeleton packing 16, a fourth skeleton packing 22, and a fifth skeleton packing 25. This ensures a more effective seal and longer service life. The sealing arrangement, which combines one fixed lubricating oil skeleton packing with two floating lubricating oil skeleton packings, and one fixed cooling water skeleton packing with one floating cooling water skeleton packing, ensures effective sealing regardless of whether the center rod 5 is centered or not. The fixed skeleton packing, floating oil seal ring 17, and floating water seal ring 26 isolate the lubricating oil and cooling water, preventing leakage, intrusion, and cross-contamination. It also prevents leakage and intrusion of lubricating oil and cooling water from the inner walls of the oil seal box 11 and water seal box 21. The oil seal group 1 and the water seal group 2 can be assembled in advance for standby use. When replacing, the auxiliary installation cylinder 3 can be used to install the sealing device as a whole. Compared with the previous assembly method through baffles and retaining springs, this saves installation time, improves installation efficiency, and is more suitable for on-site applications.
[0036] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A central intermediate rod sealing device, characterized in that: It includes an oil seal assembly and a water seal assembly, the oil seal assembly includes an oil seal box body and a floating oil seal box sealed inside the oil seal assembly, the water seal assembly includes a water seal box body and a floating water seal box sealed inside the oil seal box, the oil seal box body has an oil drainage hole, an oil seal connecting hole and an oil seal mounting hole, the lower end of the floating oil seal box has an oil drain hole, the water seal box body has a water drainage hole, a water seal connecting hole and a water seal mounting hole, the lower end of the floating water seal box has a water drain hole, the oil seal connecting hole is used to connect with the water seal connecting hole to achieve an integrated connection between the oil seal assembly and the water seal assembly, and the oil seal mounting hole is used to connect with the water seal mounting hole and the installation object to achieve sealing between the center intermediate rod sealing device and the installation object.
2. The central intermediate rod sealing device according to claim 1, characterized in that: The oil seal box body is further provided with a first skeleton sealing packing and an oil seal spacer ring, and the oil seal spacer ring is located between the first skeleton sealing packing and the floating oil seal box.
3. The central intermediate rod sealing device according to claim 2, characterized in that: The floating oil seal box is further installed with a second skeleton sealing packing, and the inner diameter of the floating oil seal box is smaller than the outer diameter of the second skeleton sealing packing.
4. The central intermediate rod sealing device according to claim 3, characterized in that: The floating oil seal box is further equipped with a third skeleton sealing packing. The inner diameter of the floating oil seal box is smaller than the outer diameter of the third skeleton sealing packing. The third skeleton sealing packing and the second skeleton sealing packing are arranged in parallel in the floating oil seal box.
5. The central intermediate rod sealing device according to claim 4, characterized in that: A first sealing groove is formed on the outer periphery of the floating oil seal box, and a floating oil seal box sealing ring is sleeved in the first sealing groove. The floating oil seal box sealing ring is used to achieve sealing between the outer periphery of the floating oil seal box and the inner wall of the oil seal box body to confine oil in the oil seal box body.
6. The central intermediate rod sealing device according to claim 1, characterized in that: A fourth skeleton sealing packing and a water seal spacer ring are further provided in the water seal box body, and the water seal spacer ring is located between the fourth skeleton sealing packing and the floating water seal box.
7. The central intermediate rod sealing device according to claim 6, characterized in that: The floating water seal box is further equipped with a fifth skeleton sealing packing, and the fifth skeleton sealing packing is in direct contact with the water seal spacer ring.
8. The central intermediate rod sealing device according to claim 7, characterized in that: A second sealing groove is formed on the outer periphery of the floating water seal box, and a floating water seal box sealing ring is sleeved in the second sealing groove. The floating water seal box sealing ring is used to achieve sealing between the outer periphery of the floating water seal box and the inner wall of the water seal box body to confine water in the water seal box body.
9. The central intermediate rod sealing device according to any one of claims 1 to 8, characterized in that: It also includes an auxiliary mounting cylinder, the outer diameter of which is equal to the outer diameter of the center intermediate rod body, and the inner diameter is equal to the outer diameter of the thin head at the front end of the center intermediate rod. The auxiliary mounting cylinder can be inserted into the thin head at the front end of the center intermediate rod so that the auxiliary mounting cylinder contacts the center intermediate rod body and forms an integrated equal-diameter outer peripheral surface.
10. The central intermediate rod sealing device according to claim 9, characterized in that: The first end of the auxiliary mounting cylinder for contacting the main body of the central intermediate rod has a first rounded corner that matches the rounded corner of the front end of the main body of the central intermediate rod, and the second end away from the main body of the central intermediate rod is also provided with a second rounded corner.