Bearing isolator and booster pump
By using a bearing isolator composed of a stationary ring, a moving ring, and a floating ring, the problem of poor durability of the skeleton oil seal is solved, and the effective sealing of the shaft hole and recycling of lubricating oil are achieved, thereby improving the durability of the booster pump and the operating efficiency of the generator set.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-04-10
AI Technical Summary
In existing technologies, the durability of skeleton oil seals is poor, which makes the front pump prone to oil leakage and affects the operating efficiency of the generator set.
The bearing isolator, which uses a static ring and a dynamic ring structure, combined with a floating ring and a sealing ring, effectively seals the shaft hole and collects lubricating oil through the oil leakage hole to return it to the oil chamber when oil leaks.
It effectively prevents oil leakage at the shaft hole, reduces frictional resistance, improves durability, and enables the collection and reuse of lubricating oil, thereby improving the operating efficiency of the generator set.
Smart Images
Figure CN224107448U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to oil seal technical field, especially relate to a bearing isolator and front pump. BACKGROUND
[0002] The generator set of thermal power plant will be equipped with steam feed pump, and the steam feed pump is provided with front pump for pressure boosting, for example, the DG600-240 type feed pump usually matches the FA1D56 type front pump as front pressure boosting equipment, the bearing of the front pump adopts 32 turbine oil for oil bath lubrication, the specific front pump includes pump shaft and pump shell, the pump shell has oil chamber in it, and the pump shell has shaft hole horizontally arranged and communicated with the oil chamber, the pump shaft horizontally penetrates the shaft hole, and the bearing is arranged at the shaft hole, and the pump shaft can rotate relative to the pump body, currently, the end of the shaft hole away from the oil chamber is sealed by the skeleton oil seal, but the skeleton oil seal has poor durability (easily deformed and large wear), once the skeleton oil seal fails, the front pump will leak, so the skeleton oil seal needs to be replaced regularly, which will affect the operation efficiency of the generator set. SUMMARY
[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a bearing isolator which has simple structure and good sealing performance.
[0004] In order to achieve the above purpose, the technical scheme of the utility model is as follows: a bearing isolator, comprising a static ring, a dynamic ring and a floating ring, the static ring and the dynamic ring are coaxially distributed, and the static ring and the dynamic ring are spaced apart in the axial direction, the side of the static ring close to the dynamic ring is coaxially recessed with a main ring groove, the side of the dynamic ring close to the static ring is coaxially convex with a main convex ring, the main convex ring is coaxially inserted into the main ring groove, the inner side wall of the main convex ring is coaxially recessed with a first ring groove, the inner side wall of the main ring groove is recessed with a second ring groove which is oppositely distributed with the first ring groove, the first ring groove and the second ring groove jointly enclose an annular accommodating cavity, and the floating ring is arranged in the accommodating cavity.
[0005] The above technical scheme has the beneficial effects that the bearing isolator can be installed in the shaft hole, the static ring is coaxially connected with the pump shell, the dynamic ring is coaxially connected with the pump shaft, at this time, the pump shaft drives the dynamic ring to rotate coaxially relative to the static ring when rotating, the gap between the main convex ring and the main ring groove is sealed by the floating ring, thereby preventing oil leakage at the shaft hole, and the floating ring in the accommodating cavity does not affect the rotation of the dynamic ring relative to the static ring.
[0006] In the above technical scheme, the outer diameter of the static ring is greater than the outer diameter of the dynamic ring, and the inner diameter of the static ring is greater than the inner diameter of the dynamic ring.
[0007] The beneficial effects of the above technical solution are that the static ring is coaxially connected with the pump shell, and the dynamic ring is coaxially mounted on the pump shaft.
[0008] The above technical solution further comprises a first sealing ring, a third ring groove is coaxially recessed on the outer wall of the static ring, and the first sealing ring is embedded in the third ring groove.
[0009] The beneficial effects of the above technical solution are that the first sealing ring seals the gap between the static ring and the pump shell.
[0010] The above technical solution further comprises a second sealing ring, a fourth ring groove is coaxially recessed on the inner wall of the dynamic ring, and the second sealing ring is embedded in the fourth ring groove.
[0011] The beneficial effects of the above technical solution are that the second sealing ring seals the gap between the dynamic ring and the pump shaft.
[0012] The above technical solution further comprises that a fifth ring groove is coaxially recessed on the outer wall of the main convex ring.
[0013] The beneficial effects of the above technical solution are that the contact area between the main convex ring and the inner wall of the main ring groove is reduced, thereby reducing the frictional resistance therebetween.
[0014] The second purpose of the utility model is to provide a front-mounted pump which has a simple structure, good durability, and can collect and recycle leaked lubricating oil.
[0015] In order to achieve the above purpose, another technical solution of the utility model is as follows: a front-mounted pump comprises a pump shell and a pump shaft, the pump shell is provided with an oil chamber, the pump shell is provided with an axial hole through which the pump shaft horizontally passes, a bearing is embedded at the axial hole and is used for rotationally connecting the pump shaft and the pump shell, and the front-mounted pump further comprises the bearing isolator as described above, the bearing isolator is embedded at the axial hole and is located outside the bearing, the static ring is connected with the pump shell, and the dynamic ring is connected with the pump shaft.
[0016] The beneficial effects of the above technical solution are that the annular gap between the pump shell and the pump shaft in the axial hole is sealed by the bearing isolator, so that the relative rotation between the pump shaft and the pump shell is not affected, and the lubricating oil is prevented from overflowing through the axial hole.
[0017] The above technical solution further comprises that a sixth ring groove is coaxially recessed on the inner wall of the static ring, and an oil leakage hole which is in communication with the sixth ring groove is further provided at the lower end of the static ring.
[0018] The beneficial effects of the above technical solution are that even if lubricating oil seeps out between the moving ring and the static ring, the seeped lubricating oil can gather in the sixth ring groove and be discharged through the oil leakage hole, so that the seeped lubricating oil cannot spread everywhere.
[0019] The oil leakage hole in the above technical solution is radially arranged on the static ring.
[0020] The beneficial effects of the above technical solution are that the oil leakage hole is a straight hole, which is not easy to be blocked, and even if it is blocked, it is easy to be poked through.
[0021] The oil leakage hole in the above technical solution is provided with a plurality of oil leakage holes.
[0022] The beneficial effects of the above technical solution are that the plurality of oil leakage holes work together to avoid affecting the discharge of the lubricating oil in the sixth ring groove due to the blockage of a single oil leakage hole.
[0023] The oil leakage hole in the above technical solution is provided with a plurality of oil leakage holes.
[0024] The beneficial effects of the above technical solution are that the lubricating oil discharged by the oil leakage hole can be collected by the oil collection groove and finally flow back into the oil chamber. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 It is a sectional view of the bearing isolator of the utility model embodiment 1.
[0026] Figure 2 It is a schematic view of the static ring and the moving ring in the separation state in the utility model embodiment 1.
[0027] Figure 3 It is a partial schematic view of the pre-pump of the utility model embodiment 2.
[0028] Figure 4 It is a schematic view of the upper oil leakage hole of the static ring in the utility model embodiment 2.
[0029] In the figure: 1, static ring; 11, main ring groove; 111, second ring groove; 12, third ring groove; 13, sixth ring groove; 14, oil leakage hole; 15, auxiliary convex ring; 2, moving ring; 21, main convex ring; 211, first ring groove; 212, fifth ring groove; 22, fourth ring groove; 23, auxiliary ring groove; 3, floating ring; 4, first sealing ring; 5, second sealing ring; 100, bearing isolator; 200, pump shell; 210, shaft hole; 220, oil collection groove; 230, oil channel; 300, pump shaft; 400, bearing. DETAILED DESCRIPTION
[0030] The principles and features of the present application are described below with reference to the accompanying drawings, which are only used to explain the present application and are not intended to limit the scope of the present application. In the following paragraphs, the present application is described in more detail with reference to the accompanying drawings. The advantages and features of the present application will be more apparent from the following description and claims. It should be noted that the drawings are greatly simplified and use non-precise proportions, only to facilitate and clarify the purpose of assisting in the description of the embodiments of the present application.
[0031] Embodiment 1
[0032] As shown in Figure 1 and Figure 2 , the present embodiment provides a bearing isolator, which comprises a static ring 1, a dynamic ring 2 and a floating ring 3, the static ring 1 and the dynamic ring 2 are coaxially distributed, and the static ring 1 and the dynamic ring 2 are spaced apart in the axial direction, the side of the static ring 1 close to the dynamic ring 2 is coaxially recessed with a main ring groove 11, the side of the dynamic ring 2 close to the static ring 1 is coaxially convex with a main convex ring 21, the main convex ring 21 is coaxially inserted into the main ring groove 11, the inner side wall of the main convex ring 21 is coaxially recessed with a first ring groove 211, the inner side wall of the main ring groove 11 is recessed with a second ring groove 111 which is oppositely distributed with the first ring groove 211, the first ring groove 211 and the second ring groove 111 jointly enclose an annular accommodating cavity, and the floating ring 3 is placed in the accommodating cavity; in this way, the bearing isolator can be installed in the shaft hole, the static ring is coaxially connected with the pump shell, the dynamic ring is coaxially connected with the pump shaft, at this time the pump shaft drives the dynamic ring to rotate coaxially relative to the static ring when rotating, at this time the gap between the main convex ring and the main ring groove is sealed by the floating ring, thereby preventing oil leakage at the shaft hole, and in addition, the floating ring does not affect the rotation of the dynamic ring relative to the static ring in the accommodating cavity.
[0033] In the above technical solution, the outer diameter of the static ring 1 is greater than the outer diameter of the dynamic ring 2 (the outer wall of the static ring is interference fit with the hole wall of the shaft hole, and the oil leakage problem of the interference joint surface can be ignored), and the inner diameter of the static ring 1 is greater than the inner diameter of the dynamic ring 2 (the oil leakage problem of the interference joint surface can be ignored); in this way, the static ring can be coaxially connected with the pump shell, and the dynamic ring can be coaxially installed on the pump shaft.
[0034] As shown in Figure 1 and Figure 2 , in the present embodiment, the side of the dynamic ring 2 close to the static ring 1 can also be coaxially recessed with a secondary ring groove 23, and the side of the static ring 1 close to the dynamic ring 2 can also be coaxially recessed with a secondary convex ring 15, the secondary convex ring is inserted into the secondary ring groove 23, at this time an "S" shaped ring gap channel is formed between the dynamic ring and the static ring after they are assembled (and the floating ring truncates the ring gap channel), which further reduces the possibility of oil leakage between the two.
[0035] In the embodiment, the main convex ring is aligned with the main ring groove, and the secondary convex ring is aligned with the secondary ring groove.
[0036] As shown in Figure 1 and Figure 2 , the technical solution further comprises a first sealing ring 4, and a third ring groove 12 is coaxially recessed on the outer wall of the static ring 1, and the first sealing ring 4 is embedded in the third ring groove 12; in this way, the first sealing ring seals the gap between the static ring and the pump shell.
[0037] As shown in Figure 1 and Figure 2 , the technical solution further comprises a second sealing ring 5, and a fourth ring groove 22 is coaxially recessed on the inner wall of the dynamic ring 2, and the second sealing ring 5 is embedded in the fourth ring groove 22; in this way, the second sealing ring seals the gap between the dynamic ring and the pump shaft.
[0038] As shown in Figure 1 and Figure 2 , the technical solution further comprises that a fifth ring groove 212 is coaxially recessed on the outer wall of the main convex ring 21; in this way, the contact area between the main convex ring and the inner wall of the main ring groove can be reduced, thereby reducing the frictional resistance therebetween.
[0039] Specifically, in the embodiment, the cross section of the accommodating cavity is square (with a side length of d1), and the cross section of the floating ring is circular (with a diameter of d2), and the floating ring, the first sealing ring, and the second sealing ring are all fluororubber rings, which have the expansion property, wherein d2 is slightly larger than d1, so that the floating ring can be slightly squeezed in the accommodating cavity, thereby separating the annular gap-shaped channel at the accommodating cavity.
[0040] Embodiment 2
[0041] As shown in Figure 3As shown in the embodiment, the pre-pump comprises a pump shell 200, a pump shaft 300 and the bearing isolator 100 as described in the embodiment 1, the pump shell 200 is provided with an oil chamber, the pump shell 200 is provided with a shaft hole 210 for the pump shaft 300 to horizontally pass through, the shaft hole 210 is embedded with a bearing 400 for the pump shaft 300 to be rotatably connected with the pump shell 200 (the rotor of the pump shaft is coaxially connected with the bearing, and the stator of the bearing is connected with the pump shell), the bearing isolator 100 is embedded at the shaft hole 210 and located outside the bearing 400, the static ring 1 is connected with the pump shell, and the dynamic ring 2 is connected with the pump shaft 300; in this way, the annular gap between the pump shell and the pump shaft in the shaft hole is sealed by the bearing isolator, so that the relative rotation between the pump shaft and the pump shell is not affected, and the lubricating oil is prevented from overflowing through the shaft hole. In actual assembly, the static ring is located on the side of the dynamic ring away from the oil chamber.
[0042] wherein, Figure 3 In the above technical solution, "A" represents the side of the pump shell close to the outside, and "B" represents the side of the pump shell close to the oil chamber, and the bearing isolator 100 is installed at the shaft hole with the static ring close to the outside and the dynamic ring close to the oil chamber, so that the bearing isolator 100 is installed at the shaft hole with good appearance, and the static ring is static when viewed from the outside through the shaft hole.
[0043] As Figures 1-4 As shown in the above technical solution, the inner wall of the static ring 1 is coaxially recessed with a sixth ring groove 13, and the lower end of the static ring 1 is further provided with an oil leakage hole 14 penetrating through the sixth ring groove 13; in this way, even if the lubricating oil seeps out between the dynamic ring and the static ring, the seeped lubricating oil can be collected in the sixth ring groove and discharged through the oil leakage hole, so that the seeped lubricating oil will not spread everywhere.
[0044] As Figure 4 As shown in the above technical solution, the oil leakage hole 14 is radially arranged on the static ring 1; in this way, the oil leakage hole is a straight hole, which is not easy to be blocked, and even if it is blocked, it can be easily poked through; preferably, a plurality of oil leakage holes 14 are arranged; in this way, the plurality of oil leakage holes work together to avoid affecting the discharge of the lubricating oil in the sixth ring groove due to the blockage of a single oil leakage hole.
[0045] As Figure 3 As shown in the above technical solution, the pump shell 200 is provided with an oil receiving groove 220 below the oil leakage hole 14, and the lower end of the oil receiving groove 220 is communicated with the oil chamber (the pump shell is provided with an oil channel 230, one end of the oil channel 230 is communicated with the lower end of the oil receiving groove, and the other end of the oil channel 230 is communicated with the oil chamber); in this way, the lubricating oil discharged through the oil leakage hole can be collected by the oil receiving groove and finally flow back to the oil chamber.
[0046] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form; any person skilled in the art can smoothly implement the present application according to the drawings shown in the specification and the above description; however, any person skilled in the art can make slight changes, modifications and equivalent changes of the present application within the scope of the technical scheme of the present application, and the equivalent embodiments of the present application are still within the protection scope of the technical scheme of the present application.
Claims
1. A bearing isolator characterized by, The bearing isolator (100) is embedded in the shaft hole (210) and located outside the bearing (400), the static ring (1) is connected with the pump shell (200), and the dynamic ring (2) is connected with the pump shaft (300). The inner wall of the static ring (1) is coaxially concave with a sixth ring groove (13), and the lower end of the static ring (1) is further provided with an oil leakage hole (14) penetrating through the sixth ring groove (13).
2. The bearing isolator of claim 1, wherein, The outer diameter of the static ring (1) is greater than the outer diameter of the dynamic ring (2), and the inner diameter of the static ring (1) is greater than the inner diameter of the dynamic ring (2).
3. The bearing isolator of claim 1, wherein, The outer wall of the static ring (1) is coaxially concave with a third ring groove (12), and the first sealing ring (4) is embedded in the third ring groove (12).
4. The bearing isolator of claim 1, wherein, The inner wall of the dynamic ring (2) is coaxially concave with a fourth ring groove (22), and the second sealing ring (5) is embedded in the fourth ring groove (22).
5. The bearing isolator of claim 1, wherein, The outer wall of the main convex ring (21) is coaxially concave with a fifth ring groove (212).
6. A front pump, comprising a pump shell (200) and a pump shaft (300), an oil chamber is arranged in the pump shell (200), the pump shell (200) has a shaft hole (210) for the pump shaft (300) to horizontally pass through, a bearing (400) for rotationally connecting the pump shaft (300) and the pump shell (200) is embedded at the shaft hole (210), characterized in that, The bearing isolator (100) is embedded in the shaft hole (210) and located outside the bearing (400), the static ring (1) is connected with the pump shell (200), and the dynamic ring (2) is connected with the pump shaft (300).
7. The front pump according to claim 6, characterized in that The oil leakage hole (14) is radially arranged on the static ring (1).
8. The front pump of claim 6, wherein, The oil leakage hole (14) is provided with a plurality of oil leakage holes.
9. A front pump according to claim 7 or 8, characterized in that The pump shell (200) is provided with an oil receiving groove (220) corresponding to the lower side of the oil leakage hole (14), and the lower end of the oil receiving groove (220) is communicated with the oil chamber.