Pump oil seal end cover

Abstract

The utility model provides a pump oil seal end cover, particularly relates to the technical field of oil seals, and is used for solving the technical problem that an existing mechanical oil seal has a certain leakage risk when equipment is frequently started and stopped and the like. The mechanical oil seal cover comprises a cover body fixedly connected to a pump body, a mechanical oil seal mechanism is arranged on the inner side of the cover body and comprises a movable ring and a static ring, the end faces of the movable ring and the static ring abut against each other, the movable ring is arranged on the inner side of the static ring, the static ring is fixedly connected with the cover body, and an auxiliary sealing mechanism is arranged on the inner side of the cover body. The auxiliary sealing mechanism is arranged on the outer side of the static ring. An auxiliary sealing structure is additionally arranged on the basis of a mechanical oil seal, the auxiliary sealing structure and a mechanical oil seal structure form multi-stage sealing, and therefore the leakage risk caused by sealing end face separation or liquid film change of the mechanical oil seal is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil seal technical field, specifically, relate to a pump oil seal end cover. BACKGROUND

[0002] For the rotating shaft of the pump, the end cover with the oil seal structure needs to be installed. At present, the oil seal structure in the oil seal end cover generally adopts the sealing structure of the mechanical oil seal to prevent the leakage of lubricating oil. The mechanical oil seal generally includes a dynamic ring fixedly sleeved on the rotating shaft and a static ring fixedly connected with the end cover, a spring is arranged on the dynamic ring to make the end surface of the dynamic ring contact with the end surface of the static ring under the action of spring elastic force and lubricating oil pressure; when working, the rotating shaft drives the dynamic ring to rotate, at this time, the dynamic ring and the static ring slide relatively, so that a layer of nanometer liquid film is maintained between the end surfaces of the two, which can not only reduce friction and wear, but also realize sealing through fluid dynamic pressure and static pressure balance.

[0003] However, in the actual use process, the occurrence of frequent start and stop of the equipment may cause a certain separation of the sealing end surface or change of the liquid film, resulting in a certain leakage risk. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a pump oil seal end cover, which increases the structure of auxiliary sealing on the basis of the mechanical oil seal, and forms a multistage sealing with the mechanical oil seal structure, so as to reduce the leakage risk caused by the separation of the sealing end surface or the change of the liquid film of the mechanical oil seal.

[0005] The embodiment of the utility model realizes the following technical scheme:

[0006] A pump oil seal end cover, comprising a cover body fixedly connected to a pump body, a mechanical oil seal mechanism is arranged on the inner side of the cover body, the mechanical oil seal mechanism comprises a dynamic ring and a static ring with mutually abutting end surfaces, the dynamic ring is arranged on the inner side of the static ring, the static ring is fixedly connected with the cover body, an auxiliary sealing mechanism is arranged on the inner side of the cover body, and the auxiliary sealing mechanism is arranged on the outer side of the static ring.

[0007] In some embodiments, the auxiliary sealing mechanism comprises an annular framework sleeved in the cover body, the annular framework is arranged on the outer side of the static ring, an installation groove is arranged on the inner side of the annular framework, a PTFE sheet is arranged in the installation groove, a sealing lip is arranged at the end of the PTFE sheet away from the annular framework, and the sealing lip is inclined towards the static ring.

[0008] In some embodiments, the PTFE sheet comprises a first PTFE sheet and a second PTFE sheet arranged in sequence away from the static ring, and rubber is arranged between the first PTFE sheet and the second PTFE sheet.

[0009] In some embodiments, the first Teflon sheet is sleeved with a clamping spring outside the sealing lip.

[0010] In some embodiments, the second Teflon sheet is provided with a spring sheet on a side close to the first Teflon sheet, the side of the spring sheet is attached to the second Teflon sheet, and the end of the spring sheet is fixedly connected to the mounting groove.

[0011] In some embodiments, the Teflon sheet further comprises a third Teflon sheet arranged inside the annular framework, the third Teflon sheet is arranged outside the second Teflon sheet, the third Teflon sheet is provided with a dustproof lip at an end away from the annular framework, and the dustproof lip is inclined towards a direction away from the static ring.

[0012] In some embodiments, a rubber is arranged between the second Teflon sheet and the third Teflon sheet.

[0013] In some embodiments, the outer edge of the static ring is provided with an auxiliary sealing ring, the auxiliary sealing ring is fixedly connected to the cover body, the auxiliary sealing ring has a U-shaped cross section, and the arc-shaped end surface of the auxiliary sealing ring is abutted against the outer edge of the static ring.

[0014] The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0015] 1、 the utility model discloses a combination of the auxiliary sealing mechanism and the mechanical oil seal mechanism to form a double sealing structure of primary sealing and secondary sealing, can carry out secondary sealing to the small amount of lubricating oil leaked from the sealing end surface of driven static ring, thereby reduce the risk of lubricating oil leakage. DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as the limitation to the scope, and for the ordinary skilled in the art, other related drawings can also be obtained without the creative labor on the premise of the drawings.

[0017] Fig. 1 The utility model provides a structural schematic diagram of pump oil seal end cover for the embodiment of the utility model;

[0018] Fig. 2 The utility model provides a structural schematic diagram of auxiliary sealing mechanism for the embodiment of the utility model.

[0019] Icon: 1, pump body; 2, cover; 3, dynamic ring; 4, static ring; 5, annular skeleton; 6, mounting groove; 7, first Teflon sheet; 8, second Teflon sheet; 9, rubber; 10, clamping spring; 11, spring sheet; 12, third Teflon sheet; 13, dust lip; 14, auxiliary sealing ring; 15, compression spring; 16, fixing bolt; 17, limit pin; 18, dynamic ring sealing ring; 19, static ring sealing ring; 20, rotating shaft. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be a clear and complete description of the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0022] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is used, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "set", "mount", "connected", "connected" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Please see Figs. 1-2 As shown in the drawings, the main body of the embodiment is a pump oil sealing end cover, which comprises a cover body 2 fixedly connected to the pump body 1 by bolts, and a mechanical oil seal mechanism is arranged on the inner side of the cover body 2. The mechanical oil seal mechanism comprises a rotating ring 3 and a static ring 4 which abut against each other, the rotating ring 3 is arranged on the inner side of the static ring 4, the rotating ring 3 comprises a fixed part and a follower part which are sleeved on the rotating shaft 20, the fixed part is fixed to the outer side wall of the rotating shaft 20 by a fixing bolt 16, a plurality of compression springs 15 are arranged between the fixed part and the follower part, so that the outer end surface of the follower part is in close contact with the inner side end surface of the static ring 4 under the action of the compression springs 15, the static ring 4 is fixedly connected to the cover body 2, and a limiting pin 17 is arranged between the static ring 4 and the cover body 2 to prevent the static ring 4 from rotating with the rotating shaft 20; a rotating ring sealing ring 18 is arranged on the inner side of the follower part, when the sealing end surface is worn, the rotating ring 3 and the rotating ring sealing ring 18 move slightly in the axial direction under the pushing of the compression spring 15, so as to achieve a certain compensation capacity. A static ring sealing ring 19 is arranged between the static ring 4 and the cover body 2, so as to reduce the leakage of lubricating oil from the gap between the static ring 4 and the cover body 2, and an auxiliary sealing mechanism is arranged on the inner side of the cover body 2, which is arranged on the outer side of the static ring 4.

[0026] The combination of the auxiliary sealing mechanism and the mechanical oil seal mechanism forms a double sealing structure of primary sealing and secondary sealing, wherein the mechanical oil seal mechanism is the primary sealing, and the auxiliary sealing mechanism is the secondary sealing. In addition, when the sealing end surface of the mechanical oil seal separates or the liquid film changes, the auxiliary sealing mechanism is arranged on the outer side of the static ring 4, so that a small amount of lubricating oil leaked from the sealing end surface of the static ring 4 can be sealed again, thereby reducing the risk of lubricating oil leakage.

[0027] Further, the auxiliary sealing mechanism comprises an annular skeleton 5 sleeved in the cover body 2, the annular skeleton 5 is arranged on the outer side of the static ring 4, the inner side of the annular skeleton 5 is provided with a mounting groove 6, and a PTFE sheet is arranged in the mounting groove 6. The PTFE sheet is made of PYFE material, the PTFE sheet is provided with a sealing lip at one end away from the annular skeleton 5, and the sealing lip is inclined towards the static ring 4.

[0028] The skeleton provides fixed support for the PTFE sheet, the sealing lip of the PTFE sheet abuts against the outer side of the rotating shaft 20, and the sealing lip of the PTFE sheet closely adheres to the surface of the rotating shaft 20 to form dynamic sealing by using the low friction characteristic of the PTFE sheet. In addition, the PTFE sheet does not need additional lubrication because of its low friction coefficient.

[0029] Further, the four fluorine sheet comprises a first four fluorine sheet 7 and a second four fluorine sheet 8 arranged in sequence in the direction away from the static ring 4, and a rubber 9 arranged between the first four fluorine sheet 7 and the second four fluorine sheet 8.

[0030] Wherein, by setting the first four fluorine sheet 7 and the second four fluorine sheet 8 to form a double sealing lip sealing structure, the sealing performance of the auxiliary sealing mechanism is improved, and the rubber 9 compensates for the change in the compression amount of the four fluorine sheet caused by pressure fluctuation, prolonging the service life.

[0031] Further, the first four fluorine sheet 7 is sleeved with a clamping spring 10 outside the sealing lip.

[0032] Wherein, the clamping spring 10 can keep the first four fluorine sheet 7 sealing lip in a pressed state with the rotating shaft 20.

[0033] Further, the second four fluorine sheet 8 is provided with a spring sheet 11 on the side close to the first four fluorine sheet 7, the side surface of the spring sheet 11 is attached to the second four fluorine sheet 8, and the end of the spring sheet 11 is fixedly connected to the mounting groove 6.

[0034] Wherein, by setting the spring sheet 11, the stable shaft holding force of the second four fluorine sheet 8 is increased.

[0035] Further, the four fluorine sheet further comprises a third four fluorine sheet 12 arranged inside the annular framework 5, the third four fluorine sheet 12 is arranged outside the second four fluorine sheet 8, the third four fluorine sheet 12 is provided with a dustproof lip 13 at one end away from the annular framework 5, and the dustproof lip 13 is inclined towards the direction away from the static ring 4.

[0036] Wherein, the dustproof lip 13 at the bottom of the third four fluorine sheet 12 prevents external pollution from entering the cover body 2.

[0037] Further, the rubber 9 is arranged between the second four fluorine sheet 8 and the third four fluorine sheet 12.

[0038] Further, the outer edge of the static ring 4 is provided with an auxiliary sealing ring 14, the auxiliary sealing ring 14 is fixedly connected with the cover body 2, the cross section of the auxiliary sealing ring 14 is U-shaped, and the arc-shaped end surface is tightly abutted with the outer edge of the static ring 4.

[0039] Wherein, the auxiliary sealing ring 14 further improves the sealing performance between the static ring 4 and the cover body 2, and reduces the risk of leakage.

[0040] It is worth mentioning that glass fibers or graphite can be added during the manufacturing process of the four fluorine sheet to further reduce the friction coefficient.

[0041] The above merely is preferred embodiment of the present utility model, and is not for limiting the present utility model, for the person skilled in the art, the present utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A pump oil seal end cover, comprising a cover body (2) fixedly connected to a pump body (1), an inner side of the cover body (2) is provided with a mechanical oil seal mechanism, characterized in that, The mechanical oil seal mechanism comprises a movable ring (3) and a static ring (4) which abut against each other in end faces, the movable ring (3) is arranged on the inner side of the static ring (4), the static ring (4) is fixedly connected with the cover body (2), the inner side of the cover body (2) is provided with an auxiliary sealing mechanism, and the auxiliary sealing mechanism is arranged on the outer side of the static ring (4); the auxiliary sealing mechanism comprises an annular framework (5) sleeved in the cover body (2), the annular framework (5) is arranged on the outer side of the static ring (4), the inner side of the annular framework (5) is provided with a mounting groove (6), the mounting groove (6) is provided with a PTFE sheet, one end of the PTFE sheet away from the annular framework (5) is provided with a sealing lip, and the sealing lip is inclined towards the static ring (4); the PTFE sheet comprises a first PTFE sheet (7) and a second PTFE sheet (8) arranged in sequence away from the static ring (4), and a rubber (9) is arranged between the first PTFE sheet (7) and the second PTFE sheet (8).

2. A pump oil seal end cap according to claim 1, wherein, The outer part of the sealing lip of the first PTFE sheet (7) is sleeved with a clamping spring (10).

3. The pump oil seal end cap of claim 1, wherein, The second PTFE sheet (8) is provided with a spring sheet (11) on the side close to the first PTFE sheet (7), the side surface of the spring sheet (11) is attached to the second PTFE sheet (8), and the end of the spring sheet (11) is fixedly connected with the mounting groove (6).

4. The pump oil seal end cap of claim 1, wherein, The PTFE sheet further comprises a third PTFE sheet (12) arranged on the inner side of the annular framework (5), the third PTFE sheet (12) is arranged on the outer side of the second PTFE sheet (8), and the third PTFE sheet (12) is provided with a dustproof lip (13) at one end away from the annular framework (5), and the dustproof lip (13) is inclined away from the static ring (4).

5. A pump oil seal end cap according to claim 4, wherein, The rubber (9) is arranged between the second PTFE sheet (8) and the third PTFE sheet (12).

6. The pump oil seal end cap of claim 1, wherein, The outer edge of the static ring (4) is provided with an auxiliary sealing ring (14), and the auxiliary sealing ring (14) is fixedly connected with the cover body (2).

7. A pump oil seal end cap according to claim 6, wherein, The cross section of the auxiliary sealing ring (14) is U-shaped, and the arc-shaped end face of the auxiliary sealing ring (14) abuts against the outer edge of the static ring (4).

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