Oil seal structure for main feed pump and main feed pump

Abstract

The utility model relates to the technical field of oil seal structures, in particular to an oil seal structure for a main feed pump and the main feed pump, the oil seal structure for the main feed pump comprises an oil retainer and a main shaft sleeved on the main feed pump, an annular baffle is arranged on the periphery of the oil retainer, and the annular baffle protrudes out of the outer side wall of the oil retainer; and the labyrinth ring is arranged outside the oil deflector ring in a sleeving mode, an annular groove is formed in the inner circumference of the labyrinth ring, and the annular baffle is partially located in the annular groove. The oil seal structure for the main feed pump and the main feed pump can solve the problem that lubricating oil is prone to leakage when an existing main feed pump operates for a long time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil seal structure, and particularly relates to an oil seal structure for a main feed water pump and the main feed water pump. BACKGROUND

[0002] In the design of the existing main feed water pump of a nuclear power plant, an oil seal structure is usually arranged on the driving end bearing body to prevent lubricating oil from leaking. This design effectively reduces the damage of equipment and the pump set, the environmental pollution of the plant and other problems caused by oil leakage.

[0003] However, in the long-term operation of the main feed water pump set, the existing oil seal structure still cannot completely avoid the occurrence of lubricating oil leakage. Especially in the case of long-term continuous operation, part of the atomized lubricating oil will gradually accumulate at the dynamic and static cooperation part of the oil seal labyrinth ring and the oil retaining ring. When a negative pressure is formed outside the bearing body, the accumulated lubricating oil will be sucked along the axial direction of the oil retaining ring and finally leak out of the bearing body, thereby affecting the safety of the normal operation of the equipment and the working environment.

[0004] In order to further improve the reliability and safety of the main feed water pump of the nuclear power plant, it is necessary to optimize and improve the existing oil seal structure to solve the problem of lubricating oil leakage after long-term operation. CONTENT OF THE INVENTION

[0005] Therefore, the present application aims to provide an oil seal structure for a main feed water pump and the main feed water pump, so as to solve the problem that the existing main feed water pump is prone to lubricating oil leakage during long-term operation.

[0006] According to a first aspect of the present application, an oil seal structure for a main feed water pump is provided, wherein the oil seal structure for the main feed water pump comprises: an oil retaining ring, which is sleeved on a main shaft of the main feed water pump, and an annular baffle is arranged on the outer periphery of the oil retaining ring, and the annular baffle protrudes from the outer sidewall of the oil retaining ring; and a labyrinth ring, which is sleeved on the outside of the oil retaining ring, and an annular groove is arranged on the inner periphery of the labyrinth ring, and the annular baffle is partially located in the annular groove.

[0007] Preferably, the number of the annular grooves is multiple, the multiple annular grooves are arranged at intervals along the axial direction of the labyrinth ring, and a protruding part is formed between two adjacent annular grooves.

[0008] Preferably, the number of the annular baffles is multiple, the multiple annular baffles are arranged in one-to-one correspondence with the multiple annular grooves, a groove is formed between two adjacent annular baffles, and the protruding part extends into the groove.

[0009] Preferably, a gap is arranged between the oil retaining ring and the labyrinth ring, and a gap is arranged between the annular baffle and the protruding part.

[0010] Preferably, a radial oil passage is arranged on the bottom of each of the annular grooves, and a plurality of the radial oil passages are arranged in a row along the axial direction of the labyrinth ring; the labyrinth ring is further provided with an axial oil passage which is connected to the inside of the bearing body of the water pump; the plurality of radial oil passages arranged in a row are arranged on the upper part of the axial oil passage and are connected to the axial oil passage.

[0011] Preferably, a plurality of radial oil passages are arranged on the bottom of the annular groove at intervals in the circumferential direction; the radial oil passages in the plurality of annular grooves are arranged in a plurality of rows along the axial direction of the labyrinth ring; the number of the axial oil passages is plural; the plurality of axial oil passages are respectively arranged on the lower part of the plurality of rows of radial oil passages; and the plurality of rows of radial oil passages are respectively connected to the plurality of axial oil passages.

[0012] Preferably, the oil seal structure for the main feed water pump further comprises an annular oil retaining disc, the oil retaining disc is arranged between the bearing of the main feed water pump and the oil retaining ring, the oil retaining disc is sleeved on the main shaft, and the oil retaining disc is fixed to the bearing pillow of the main feed water pump through the cylindrical connecting piece.

[0013] Preferably, the outer diameter of the oil retaining disc is 257mm to 259mm.

[0014] Preferably, the oil seal structure for the main feed water pump further comprises an annular outer baffle, the outer baffle is arranged between the oil retaining disc and the bearing, the outer baffle is sleeved on the main shaft, the end of the bearing pillow is formed with an annular mounting groove, the outer baffle is clamped in the annular mounting groove, and the outer baffle is fixed to the bearing pillow of the main feed water pump through the cylindrical connecting piece.

[0015] According to the second aspect of the utility model, a main feed water pump is provided, wherein the main feed water pump comprises the oil seal structure for the main feed water pump.

[0016] The oil seal structure for the main feed water pump and the main feed water pump of the utility model embodiment, the oil retaining ring is sleeved on the main shaft of the main feed water pump, and an annular baffle is arranged on the outer periphery of the oil retaining ring. The annular baffle protrudes from the outer sidewall of the oil retaining ring. The labyrinth ring is sleeved on the outside of the oil retaining ring. The inner periphery of the labyrinth ring is provided with an annular groove, and the annular baffle partially extends into the annular groove. In this way, the annular baffle and the annular groove can cooperate with each other to form a new oil retaining structure at the dynamic and static cooperation part of the oil retaining ring and the labyrinth ring, so as to block the exosmosis of lubricating oil. In addition, the oil retaining ring cancels the original shielding angle, so that the lubricating oil can flow into the bearing body more smoothly, and the exosmosis opportunity is reduced. Therefore, the problem that the existing main feed water pump is prone to lubricating oil leakage during long-term operation can be effectively solved.

[0017] In order to make the above objects, features and advantages of the present application more apparent, the following will specifically describe a preferred embodiment in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 is a schematic view of the oil seal structure for the main feed water pump according to the present application.

[0020] Figure 2 is a schematic view of part of the oil seal structure for the main feed water pump according to the present application.

[0021] Figure 3 is a local enlarged view of the oil seal structure for the main feed water pump according to the present application.

[0022] Figure 4 is a sectional view of the labyrinth ring of the oil seal structure for the main feed water pump according to the present application.

[0023] Figure 5 is a schematic view of the labyrinth ring of the oil seal structure for the main feed water pump according to the present application.

[0024] Figure 6 is a sectional view of the oil retaining ring of the oil seal structure for the main feed water pump according to the present application.

[0025] Reference signs: 1 - oil retaining ring; 10 - groove; 11 - annular baffle; 2 - labyrinth ring; 20 - annular groove; 21 - protruding part; 22 - radial oil passage hole; 23 - axial oil passage hole; 3 - oil retaining disc; 4 - outer baffle; 5 - main shaft; 6 - bearing body; 7 - bearing; 8 - bearing pillow; 80 - cylindrical connecting piece; 81 - axial screw. DETAILED DESCRIPTION

[0026] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and thus particular embodiments described herein are not intended as being exhaustive of what the present disclosure can provide. For example, although processes are described with regard to the present disclosure, such processes can include more, fewer, or only a single process. Additionally, some processes can not be implemented even though they are described. Moreover, although processes are described herein as various separate processes, which can be performed by different systems, such processes can be performed by a single system as desired. Additionally, some processes can not be implemented even though they are described. Furthermore, any combination of these processes can be implemented. Although the present disclosure has been described with regard to one or more particular embodiments thereof, numerous modifications and changes can be made to the disclosure that will achieve like results.

[0027] The features described herein can be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, these examples are provided as instance of implementing the methods, apparatuses, and / or systems described herein for which the disclosure provides enabling tacks after understanding the disclosure.

[0028] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, "on top of" another element, or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to," "directly adjacent to," "directly on top of," or "directly covering" another element, there are no other elements interposed therebetween.

[0029] As used herein, the term "and / or" includes any one and any combination of the associated items in the list.

[0030] Although terms such as "first" and "second" can be used herein to describe various elements, components, regions, layers, or sections, these elements, components, regions, layers, or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, the first element, component, region, layer, or section described in the examples described herein can also be referred to as a second element, component, region, layer, or section without departing from the teachings of the examples.

[0031] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0032] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0033] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0034] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0035] like Figures 1 to 6 As shown, according to a first aspect of the present invention, an oil seal structure for a main feed water pump is provided, the oil seal structure for the main feed water pump including an oil baffle ring 1 and a labyrinth ring 2.

[0036] In the following description, reference will be made to Figures 1 to 6 The specific structure of the components mentioned above, as well as the connection relationship of the components, are described in detail in the description of the oil seal structure used for the main feed water pump.

[0037] like Figures 1 to 6As shown in the embodiments, the oil retaining ring 1 can be sleeved on the main shaft 5 of the main feed water pump. An annular baffle 11 can be arranged on the outer periphery of the oil retaining ring 1. The annular baffle 11 can protrude from the outer side wall of the oil retaining ring 1 to block the exosmosis of lubricating oil. The labyrinth ring 2 can be sleeved outside the oil retaining ring 1. An annular groove 20 can be arranged on the inner periphery of the labyrinth ring 2, and the annular baffle 11 can partially extend into the annular groove 20. In this way, the annular baffle 11 and the annular groove 20 can cooperate with each other to form an additional oil retaining structure at the dynamic and static cooperation part of the oil retaining ring 1 and the labyrinth ring 2, so as to block the exosmosis of lubricating oil.

[0038] Preferably, as shown in the embodiments, Figures 1 to 3 As shown in the embodiments, the outer periphery of the labyrinth ring 2 can be fixed to the bearing body 6 of the main feed water pump by bolts and clamping grooves, so as to fix the position of the labyrinth ring 2. The inner periphery of the labyrinth ring 2 can face the outer periphery of the oil retaining ring 1, and the annular groove 20 can be formed on the inner periphery of the labyrinth ring 2. The depth direction of the annular groove 20 can be the radial direction of the labyrinth ring 2, and the annular groove 20 can be coaxial with the labyrinth ring 2. Further preferably, the number of the annular grooves 20 can be multiple. The multiple annular grooves 20 can be arranged at intervals along the axial direction of the labyrinth ring 2, and the two adjacent annular grooves 20 can form a protruding part 21.

[0039] Further preferably, as shown in the embodiments, Figures 1 to 3 and Figure 6 As shown in the embodiments, the oil retaining ring 1 can be fixedly connected with the main shaft 5 by three radially distributed locking screws, so as to fix the oil retaining ring 1 to the main shaft 5. The oil retaining ring 1 rotates synchronously with the main shaft 5. The annular baffles 11 are arranged on the outer periphery of the oil retaining ring 1, and the number of the annular baffles 11 can be multiple. The multiple annular baffles 11 are arranged at intervals along the axial direction of the outer side wall of the oil retaining ring 1. The multiple annular baffles 11 can be arranged one by one with the multiple annular grooves 20, so that each annular baffle 11 can cooperate with one annular groove 20.

[0040] Specifically, as shown in the embodiments, four annular baffles 11 can be arranged on the outer periphery of the oil retaining ring 1, and four annular grooves 20 can be formed on the inner periphery of the labyrinth ring 2. The four annular baffles 11 can extend into the four annular grooves 20, so that the oil retaining ring 1 and the labyrinth ring 2 can be fitted together.

[0041] The two adjacent annular baffles 11 can form a groove 10, and the protruding part 21 of the labyrinth ring 2 can extend into the groove 10. In this way, multiple oil retaining structures can be formed at the dynamic and static cooperation part of the oil retaining ring 1 and the labyrinth ring 2, so as to significantly improve the exosmosis of lubricating oil.

[0042] Further preferably, as shown in the embodiments, Figures 1 to 3As shown, in this embodiment, a gap may be provided between the oil baffle ring 1 and the labyrinth ring 2, that is, the top of the protrusion 21 does not contact the bottom of the groove 10, and the top of the annular baffle 11 does not contact the bottom of the annular groove 20. A gap is also provided between the annular baffle 11 and the protrusion 21. This arrangement reduces friction between the oil baffle ring 1 and the labyrinth ring 2, preventing wear during the rotation of the oil baffle ring 1. Furthermore, preferably, the original blocking angle structure of the oil baffle ring 1 can be eliminated (i.e., the end of the oil baffle ring 1 no longer blocks the radial side of the labyrinth ring 2), allowing the lubricating oil to flow more smoothly into the bearing body 6 (i.e., as shown). Figure 2 The right side of the oil baffle ring 1 shown is used to reduce the chance of lubricating oil leakage.

[0043] In addition, preferred, such as Figures 3 to 5 As shown in the embodiment, radial oil passage holes 22 can be provided at the bottom of the multiple annular grooves 20, and the multiple radial oil passage holes 22 can be circular holes of the same diameter. The multiple radial oil passage holes 22 can be arranged in a row along the axial direction of the labyrinth ring 2. The labyrinth ring 2 can also be provided with axial oil passage holes 23, and the axial oil passage holes 23 can be connected to the interior of the bearing body 6 of the water pump. The multiple radial oil passage holes 22 arranged in a row are located above the axial oil passage holes 23 and are connected to the axial oil passage holes 23, so that lubricating oil can flow into the axial oil passage holes 23 through the radial oil passage holes 22 under the influence of gravity, and finally flow into the interior of the bearing body 6 through the axial oil passage holes 23.

[0044] Further optimized, such as Figures 3 to 5 As shown, in this embodiment, a plurality of radial oil passage holes 22 can be provided circumferentially at intervals at the bottom of the annular groove 20. The radial oil passage holes 22 in the plurality of annular grooves 20 can be arranged in multiple rows along the axial direction of the labyrinth ring 2. Correspondingly, the number of axial oil passage holes 23 can be multiple. The multiple axial oil passage holes 23 are respectively disposed at the lower part of the multiple rows of radial oil passage holes 22, so that the multiple rows of radial oil passage holes 22 can be respectively connected to the multiple axial oil passage holes 23. This improves the oil drainage efficiency of the labyrinth ring 2.

[0045] Furthermore, preferably, in this embodiment, to ensure the flow direction of the lubricating oil in the axial oil passage 23, the axial oil passage 23 can be a blind hole, so that the axial end of the axial oil passage 23 only connects to the interior of the bearing body 6. To ensure that the lubricating oil can flow along a predetermined path under gravity, the radial oil passage 22 and the axial oil passage 23 can be provided only on the lower half of the oil baffle ring 1, ensuring that the radial oil passage 22 is closer to the axis of the oil baffle ring 1 than the axial oil passage 23.

[0046] Preferred, such as Figure 1 and Figure 2As shown in the embodiment, the oil seal structure for the main feed water pump also includes an annular oil baffle 3. The oil baffle 3 can be disposed between the bearing 7 of the main feed water pump and the oil baffle ring 1. The oil baffle 3 is sleeved on the main shaft 5 and fixed to the bearing pad 8 of the main feed water pump by a cylindrical connector 80, thereby blocking lubricating oil from the bearing 7 and reducing the probability of lubricating oil leakage.

[0047] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the cylindrical connector 80 may have a threaded hole along the axial direction. The oil baffle 3 may be disposed at the first end of the cylindrical connector 80 (i.e., the end away from the bearing rest 8). The end face of the bearing rest 8 may be a vertical plane, so that the surface of the oil baffle 3 can fit against the end face of the bearing rest 8. The oil baffle 3, the cylindrical connector 80, and the bearing rest 8 may be fixedly connected by axial screws 81.

[0048] In addition, preferred, such as Figure 1 and Figure 2 As shown, in this embodiment, the outer diameter of the oil baffle 3 is 257mm to 259mm. This design minimizes the possibility of lubricating oil in the bearing housing 6 overflowing the oil baffle 3, thereby reducing the chance of lubricating oil leakage.

[0049] Further optimized, such as Figure 1 and Figure 2 As shown in the embodiment, the oil seal structure for the main feed water pump may further include an annular outer baffle 4. The diameter of the outer baffle 4 is smaller than the diameter of the oil baffle plate. The outer baffle 4 may be disposed between the oil baffle plate 3 and the bearing 7, and the outer baffle 4 is sleeved on the main shaft 5. An annular mounting groove may also be formed at the end of the bearing pad 8, so that the outer baffle 4 can be engaged in the annular mounting groove. The outer side surface of the outer baffle 4 (i.e., the side surface near the oil baffle plate) is flush with the end face of the bearing pad 8. The second end of the cylindrical connector 80 (i.e., the end near the bearing pad 8) may abut against the outer side surface of the outer baffle 4. The oil baffle plate 3, the cylindrical connector 80, the outer baffle 4, and the bearing pad 8 may be connected together by the axial screw 81, thereby fixing the outer baffle 4 to the bearing pad 8. The outer baffle 4 can directly block the lubricating oil from the bearing 7 side, further reducing the possibility of lubricating oil leakage. The portion of the outer baffle 4 that contacts the main shaft 5 can be thinned to reduce friction between the outer baffle 4 and the main shaft 5.

[0050] Furthermore, according to a second aspect of the present invention, a main feed water pump is provided, the main feed water pump including the oil seal structure for the main feed water pump as described above.

[0051] During use, the oil seal structure of the main feed water pump realizes the design requirements of improving oil return and blocking external leakage through the cooperation of the labyrinth ring 2 and the oil blocking ring 1, the cooperation of the radial oil passage 22 and the axial oil passage 23, the oil blocking disc 3 and the outer baffle 4, and significantly improves the lubricating oil leakage of the main feed water pump during long-term operation.

[0052] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present application, which are used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions described in the foregoing embodiments, or make equivalent replacements to some technical features, within the technical scope disclosed by the present application. Such modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil seal structure for a main feed pump, provided to a main feed pump, characterized by, The oil seal structure for the main feed water pump comprises: an oil retaining ring, which is sleeved on a main shaft of the main feed water pump, and an outer periphery of the oil retaining ring is provided with annular baffles, and the annular baffles protrude from an outer sidewall of the oil retaining ring; and a labyrinth ring, which is sleeved on an outside of the oil retaining ring, and an inner periphery of the labyrinth ring is provided with annular grooves, and the annular baffles are partially located in the annular grooves. The oil seal structure for the main feed water pump further comprises an annular oil retaining disc, which is arranged between a bearing of the main feed water pump and the oil retaining ring, the oil retaining disc is sleeved on the main shaft, and the oil retaining disc is fixed to the bearing pillow of the main feed water pump through a cylindrical connecting piece.

2. The oil seal structure for a main feed water pump according to claim 1, characterized by The number of the annular grooves is plural, and the plural annular grooves are arranged at intervals along an axial direction of the labyrinth ring, and a protruding portion is formed between two adjacent annular grooves.

3. The oil seal structure for a main feed water pump according to claim 2, characterized in that, The number of the annular baffles is plural, and the plural annular baffles are arranged in one-to-one correspondence with the plural annular grooves, a groove is formed between two adjacent annular baffles, and the protruding portion extends into the groove.

4. The oil seal structure for a main feed water pump according to claim 3, characterized in that, A gap is arranged between the oil retaining ring and the labyrinth ring, and a gap is arranged between the annular baffles and the protruding portion.

5. The oil seal structure for a main feed water pump according to claim 2, characterized in that, Radial oil passing holes are arranged at bottoms of the plural annular grooves, the plural radial oil passing holes are arranged in a row along the axial direction of the labyrinth ring, the labyrinth ring is further provided with an axial oil passing hole, the axial oil passing hole is communicated with an inside of a bearing body of the water pump, the plural radial oil passing holes arranged in the row are arranged at upper portions of the axial oil passing hole and are communicated with the axial oil passing hole.

6. The oil seal structure for a main feed water pump according to claim 5, characterized in that, The radial oil passing holes are arranged at intervals along a circumferential direction at the bottoms of the annular grooves, the radial oil passing holes in the plural annular grooves are arranged in multiple rows along the axial direction of the labyrinth ring, the number of the axial oil passing holes is plural, the plural axial oil passing holes are respectively arranged at lower portions of the multiple rows of radial oil passing holes, and the multiple rows of radial oil passing holes are respectively communicated with the plural axial oil passing holes.

7. The oil seal structure for a main feed water pump according to claim 1, characterized by An outer diameter of the oil retaining disc is 257mm to 259mm.

8. The oil seal structure for a main feed water pump according to claim 1, characterized by The oil seal structure for the main feed water pump further comprises an annular outer baffle, which is arranged between the oil retaining disc and the bearing, the outer baffle is sleeved on the main shaft, an end portion of the bearing pillow is formed with an annular mounting groove, the outer baffle is clamped in the annular mounting groove, and the outer baffle is fixed to the bearing pillow of the main feed water pump through the cylindrical connecting piece.

9. A main feed water pump characterized by, The main feed water pump comprises the oil seal structure for the main feed water pump according to any one of claims 1 to 8.

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