Corrosion-resistant double-end-face packaging type mechanical seal

Abstract

The utility model provides a corrosion-resistant double-end-face packaging type mechanical seal which comprises a shaft sleeve and a sealing seat arranged on the outer side of the shaft sleeve in a sleeved mode, a first installation groove is formed in one end of the sealing seat, a main static ring is assembled in the first installation groove, and a positioning protruding column is arranged at one end of the main static ring in an outwards-protruding mode. A first sealing ring is assembled between the outer side wall of the positioning convex column and the inner wall of the first mounting groove; a limiting ring is convexly arranged on the inner wall of one end, close to the first mounting groove, of the sealing seat; a positioning clamp spring is assembled on the outer wall of the main static ring; an annular movable ring seat is arranged on the outer wall of one end of the shaft sleeve in an outwards-protruding mode, an integrally-formed driving ring is assembled at the end, close to the main static ring, of the movable ring seat, one end of the driving ring abuts against the main static ring, and a second sealing ring is arranged between the inner side of the end, close to the movable ring seat, of the driving ring and the end face of the movable ring seat. According to the corrosion-resistant double-end-face packaging type mechanical seal, the mechanical seal structure is improved, the shaft sleeve made of metal and the sealing base structure are prevented from making contact with a contact medium, and therefore the better corrosion-resistant effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal technical field, specifically, relate to a kind of corrosion-resistant double-end face packing type mechanical seal. BACKGROUND

[0002] Double-end face mechanical and seal and single-end face mechanical seal same working principle, both rely on end vertical shaft rotation (friction) device keep height and relative sliding fluid pressure and elastic force effect and auxiliary seal, prevent fluid leakage coordinated compensation mechanism. Double-end face mechanical, including primary main seal and secondary seal, if primary main seal of relying on medium end fails, medium will not directly leak to atmosphere, but be blocked in isolation chamber by secondary seal, give maintenance time.

[0003] In addition, in order to facilitate the installation of mechanical seal, currently usually make primary seal and secondary seal into integrated structure through shaft sleeve, seal seat, flange seat and other structures, the entire mechanical seal device can be installed at one time, simple, fast. Such as patent CN220792053U discloses a double-end face packing type mechanical seal, the metal material seal seat and shaft sleeve in its structure are directly contacted with medium, when the sealed medium is strong corrosive liquid (such as chlorine, chloric acid, hydrochloric acid, etc.), dynamic ring and static ring are selected from pressureless sintered silicon carbide, O-shaped ring is selected from corrosion-resistant perfluoroether rubber, only the material of shaft sleeve and shell is difficult to solve, directly using conventional 316 stainless steel material is easy to be corroded;If titanium material, harries C-276 is selected, the cost is too expensive. Therefore, the existing mechanical seal needs to be improved in structure, and corrosion resistance needs to be achieved without increasing cost. UTILITY MODEL CONTENT

[0004] To overcome at least one defect in the above prior art, the utility model provides a kind of corrosion-resistant double-end face packing type mechanical seal, by improving the structure of mechanical seal, avoid the structure contact medium of metal material shaft sleeve and seal seat, to reach corrosion-resistant effect.

[0005] The utility model provides a kind of corrosion -resistant double-end face packing type mechanical seal: including the shaft sleeve of being sleeved on the rotating shaft, the outer portion of the shaft sleeve is equipped with the sealing seat for being connected with equipment shell, and the inner side of the medium one end of the sealing seat is provided with first installation slot, the main static ring is equipped in the first installation slot, the outer convex of the one end of the main static ring away from the sealing seat is formed with the positioning boss for being inserted to equipment installation cavity, annular groove is arranged between the outer side wall of the positioning boss and the inner wall of the first installation slot, and the first sealing ring is equipped in the annular groove;The inner wall of the one end of the sealing seat near the first installation slot is provided with limit ring outwardly convex, the outer wall of the one end of the main static ring away from medium is provided with positioning groove, and the positioning snap spring is equipped in the positioning groove, and the positioning snap spring is used to limit the main static ring and separates from the sealing seat along the axial direction;The outer wall of one end in the inner cavity of the sealing seat of the shaft sleeve is provided with annular dynamic ring seat outwardly convex, and the one end of the dynamic ring seat near the main static ring is slidably equipped with integrally formed driving ring along the axial direction, and the one end of the driving ring is abutted with the main static to form main seal, and the inner side of the one end of the driving ring near the dynamic ring seat is provided with step groove, and the end surface between the step groove and the dynamic ring seat forms sealing groove, and the second sealing ring is equipped in the sealing groove.

[0006] Compared with the prior art, the corrosion -resistant double-end face packing type mechanical seal has the following advantages:

[0007] The corrosion -resistant double-end face packing type mechanical seal of the utility model only has medium end static ring, shaft sleeve sealing ring and first sealing ring in contact with medium, all metal parts are not in direct contact with medium, effectively preventing the shaft sleeve and sealing seat made of metal material from being corroded by medium; After such arrangement, the material of the shaft sleeve and the sealing seat does not need to be selected as a specific high corrosion -resistant alloy, so that the mechanical seal has great economy; In addition, in the improved sealing structure, the main static ring and the sealing seat are axially positioned by the positioning snap spring made of metal material, the structure is simple, and the stability of the main static ring and the sealing seat after assembly of the packing type mechanical seal is ensured; On the other hand, the driving ring and the main static ring are integrally formed, which effectively improves the strength performance of the sealing ring structure.

[0008] As an improvement, the other end of the sealing seat is equipped with a flange cover, a plurality of connecting bolts for axial connection to the end surface of the sealing seat are arranged on the flange cover; The flange cover is provided with a second installation slot, and the second installation slot is equipped with an integrally formed auxiliary static ring; The other end of the dynamic ring seat is slidably equipped with an integrally formed auxiliary driving ring along the axial direction, and the auxiliary driving ring and the auxiliary static ring are relatively rotatable along the circumferential direction to form a secondary seal.

[0009] Further improved, the outer wall of the main static ring away from the medium end is provided with an avoiding gap in communication with the positioning groove.

[0010] Further improved, the first driving lug is formed on the inner circumferential wall of the first driving groove of the dynamic ring seat, and the second driving lug is formed on the inner circumferential wall of the second driving groove of the dynamic ring seat.

[0011] Further improved, the bottom of the first driving groove is provided with a plurality of installation holes distributed in the circumferential direction and penetrating to the bottom wall of the second driving groove, a plurality of springs are distributed and matched in the installation holes, and the two ends of the plurality of springs are respectively in abutment with the tail ends of the main driving ring and the auxiliary driving ring.

[0012] Further improved, the side wall of the sealing seat is provided with a liquid inlet through hole and a liquid outlet through hole, and the inner end of the liquid inlet through hole is close to the main seal, and the inner end of the liquid outlet through hole is close to the auxiliary seal.

[0013] The above-mentioned improvements of the utility model will be specifically described in the following specific embodiments, and some of them will become apparent from the description or be understood by implementing the utility model. The purposes and other advantages of the utility model can be achieved and obtained through the structures specially pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a half-section view of the corrosion-resistant double-end-face assembled mechanical seal of the utility model;

[0015] Figure 2 It is a local enlarged view of the main static ring and sealing seat installation structure in the utility model;

[0016] Figure 3 It is a local enlarged view of the main driving ring, auxiliary driving ring and dynamic ring seat connection structure in the utility model;

[0017] Figure 4 It is another position local enlarged view of the main driving ring, auxiliary driving ring and dynamic ring seat connection structure in the utility model;

[0018] Figure 5 It is another embodiment structure section view of the corrosion-resistant double-end-face assembled mechanical seal of the utility model.

[0019] Explanation of reference signs:

[0020] 1, shaft sleeve; 2, sealing seat; 3, first mounting groove; 4, main static ring; 5, positioning column; 6, annular groove; 7, first sealing ring; 8, limiting ring; 9, positioning groove; 10, positioning snap spring; 11, dynamic ring seat; 12, main dynamic ring; 13, sealing groove; 14, second sealing ring; 15, flange cover; 16, connecting bolt; 17, second mounting groove; 18, auxiliary static ring; 19, auxiliary dynamic ring; 20, avoidance gap; 21, first dynamic ring groove; 22, first transmission lug; 23, first transmission groove; 24, second dynamic ring groove; 25, second transmission lug; 26, second transmission groove; 27, mounting hole; 28, spring; 29, liquid inlet through hole; 30, liquid outlet through hole; 31, flow guide plate. DETAILED DESCRIPTION

[0021] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0022] In the description of the embodiments of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "fixed", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0023] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0024] Reference should be made to Figures 1-5As shown, the application discloses a kind of corrosion-resistant double-end face packing type mechanical seal, including the shaft sleeve 1 of sleeve on rotating shaft, O-ring is equipped between the inner wall of shaft sleeve 1 close to medium end and the outer wall of rotating shaft, and the other end of shaft sleeve 1 is drivingly connected with rotating shaft, specifically, shaft sleeve 1 is synchronous rotation with rotating shaft under the action of corresponding driving connection structure.This embodiment, a driving ring is sleeved on the outer wall of rotating shaft close to atmosphere end, a plurality of along circumferential distribution and radially extending tight screws are provided on the side wall of driving ring, and the inner end of each tight screw is connected on the outer wall of rotating shaft;In addition, in order to realize the connection of driving ring and shaft sleeve 1, a plurality of along circumferential distribution and radially extending connecting screws are further provided on the side wall of driving ring, and the plurality of connecting screws and tight screws are circumferentially staggered, and the inner end of the plurality of connecting screws is all connected on the outer wall of shaft sleeve 1.In addition, positioning wind shield is further sleeved on the outer wall of shaft sleeve 1, and the axial position of driving ring is limited by positioning wind shield.

[0025] In addition, referring to the drawings Figure 2 Sealing seat 2 for connecting with equipment shell is sleeved on the outside of shaft sleeve 1, and the inner side of sealing seat 2 close to medium one end is provided with first installation groove 3, and one-piece formed main static ring 4 is equipped in first installation groove 3, and positioning convex column 5 for inserting into equipment installation cavity is formed on the outer convex of the end of main static ring 4 away from sealing seat 2, and annular groove 6 is arranged between the outer side wall of positioning convex column 5 and the inner wall of first installation groove 3, and first sealing ring 7 is equipped in annular groove 6, so that after the whole sealing seat 2 is installed into equipment installation cavity, it will not directly contact medium, so as to avoid corrosion of sealing seat 2 by medium.

[0026] In addition, in the above structure, limiting ring 8 is arranged on the inner wall of sealing seat 2 close to first installation groove 3 one end, and positioning recess 9 is arranged on the outer wall of main static ring 4 away from medium one end, and positioning snap spring 10 is equipped in positioning recess 9, and positioning snap spring 10 is used to limit the axial separation of main static ring 4 from sealing seat 2;In this structure, after main static ring 4 is installed into first installation groove 3 from left to right direction, positioning snap spring 10 is installed from the right side cavity of sealing seat 2, until it is clamped in annular groove 6, and the outer diameter of positioning snap spring 10 is greater than the inner hole diameter of limiting ring 8, so as to prevent main static ring 4 from separating from first installation groove 3 along axial direction after the whole mechanical seal is assembled.

[0027] In this embodiment, avoiding notch 20 is formed on the outer wall of main static ring 4 away from medium one end, which is communicated with positioning recess 9, and the avoiding notch 20 is convenient for special tool to extend into operation when positioning snap spring 10 is installed or disassembled, and the disassembly convenience is increased.

[0028] In this embodiment, the outer wall of the shaft sleeve 1 at one end in the inner cavity of the sealing seat 2 is provided with an annular dynamic ring seat 11, and the one end of the dynamic ring seat 11 close to the main static ring 4 is slidably fitted with a one-piece formed main driving ring 12, and the one end of the main driving ring 12 abuts against the main static ring to form a main seal. The inner side of the one end of the main driving ring 12 close to the dynamic ring seat 11 is provided with a stepped groove, and the stepped groove and the end face of the dynamic ring seat 11 form a sealing groove 13, and the sealing groove 13 is fitted with a second sealing ring 14. Here, the second sealing ring 14 realizes the isolation of the shaft sleeve 1 and the medium, thereby preventing the metal shaft sleeve 1 from being corroded by the medium, improving the practical service life, and ensuring the stability of the sealing performance.

[0029] In addition, the other end of the sealing seat 2 is fitted with a flange cover 15, a plurality of connecting bolts 16 are provided on the flange cover 15, a plurality of threaded holes are provided on the end face of the sealing seat 2 close to the atmosphere, the flange cover 15 is connected to the end face of the sealing seat 2 through the plurality of connecting bolts 16 along the axial direction, and a positioning stopper is formed on the flange cover 15 close to the sealing seat 2, and an O-ring is fitted between the positioning stopper and the inner wall of the sealing seat 2 to ensure the sealing of the connection between the flange cover 15 and the sealing seat 2. The sealing seat 2, the main seal, the secondary seal and the flange cover 15 form a sealed isolation cavity, and during normal operation, the isolation cavity is circulated and injected with flushing liquid, which can timely remove the friction heat of the sealing surface through the circulation of the flushing liquid, thereby avoiding the thermal deformation of the sealing ring and better ensuring the sealing performance. In this embodiment, liquid inlet holes 29 and liquid outlet holes 30 are provided on the side wall of the sealing cavity, and the inner end of the liquid inlet holes 29 is close to the main seal, and the inner end of the liquid outlet holes 30 is close to the secondary seal. The flushing liquid enters the sealing cavity first to flush the main seal position, and timely cools and cools the sealing ring of the main seal to ensure the sealing performance.

[0030] In other embodiments, when the positions of the liquid inlet holes 29 and the liquid outlet holes 30 are limited by the installation position and cannot be directly aligned with the main seal or the secondary seal, the corresponding flow guide plate 31 can be installed on the inner wall of the sealing seat 2 to guide the flushing liquid to ensure that the flushing liquid can be quickly and timely flushed to the main seal. For details, see the accompanying drawings. Figure 5 .

[0031] In another aspect, in this embodiment, a second installation groove 17 is provided on the inner side wall of the flange cover 15, and a one-piece formed secondary static ring 18 is fitted in the second installation groove 17. The other end of the dynamic ring seat 11 is slidably fitted with a one-piece formed secondary driving ring 19, and the secondary driving ring 19 and the secondary static ring 18 abut against each other in the circumferential direction to form a secondary seal. In this structure, the tail end of the secondary static ring 18 is provided with a sealing pad with an L-shaped cross section to ensure the sealing performance after being fitted with the flange cover 15.

[0032] More specifically, see the accompanying drawings. Figure 3In the structure, the first driving lug 22 is formed on the inner circumferential wall of the first driving groove 21, and the first driving groove 23 is arranged on the outer wall of the driving ring 12. The second driving lug 25 is formed on the inner circumferential wall of the second driving groove 24, and the second driving groove 26 is arranged on the outer wall of the driven ring 19. The driving ring 12 and the driven ring 19 are integrally formed, and the torque is transmitted through the corresponding driving lugs in the assembly structure of the driving ring 12, the driven ring 19 and the driving ring seat 11. In addition, the cooperation of the driving lugs and the driving grooves simultaneously plays an axial limiting role for the axial movement of the driving ring 12 and the driven ring 19, thereby ensuring the stability of the movement. Preferably, the driving lugs are directly integrally formed on the driving ring seat 11, and the structure is simple, convenient to process, and stable and reliable in transmission.

[0033] In addition, referring to the accompanying drawings Figure 4 A plurality of installation holes 27 are arranged on the bottom of the first driving groove 21 and penetrate the bottom wall of the second driving groove 24, a plurality of springs 28 are arranged in the installation holes 27, and the two ends of the plurality of springs 28 are respectively in abutment with the tail ends of the driving ring 12 and the driven ring 19. In this structure, the spring 28 is effectively avoided from contacting the medium, thereby avoiding corrosion by the medium and ensuring the stability of the elastic compensation force. In addition, the driving ring 12 and the driven ring 19 share a set of springs 28, and the installation holes 27 also share a set of installation holes 27, thereby reducing the number of parts, facilitating installation and saving costs.

[0034] In the description of the present application, the description of the terms "the present embodiment", "some embodiments" and the like means that the specific features, mechanisms, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0035] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical range disclosed in the present application can be easily thought of by those skilled in the art, 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. A corrosion resistant double mechanical seal of the packed type characterized in that: The utility model provides a sealing device for rotating shaft, which comprises a sleeve (1) sleeved on a rotating shaft, an outer part of the sleeve (1) is provided with a sealing seat (2) for connecting with a device shell, a first installation slot (3) is arranged on an inner side of the sealing seat (2) near a medium end, a main static ring (4) is arranged in the first installation slot (3), a positioning convex column (5) is formed on an outer part of an end of the main static ring (4) away from the sealing seat (2), an annular groove (6) is arranged between an outer side wall of the positioning convex column (5) and an inner wall of the first installation slot (3), and a first sealing ring (7) is arranged in the annular groove (6); a limiting ring (8) is arranged on an outer part of an inner wall of the sealing seat (2) near the first installation slot (3), a positioning recess (9) is arranged on an outer wall of an end of the main static ring (4) away from the medium, a positioning snap spring (10) is arranged in the positioning recess (9), and the positioning snap spring (10) is used for limiting the main static ring (4) from being separated from the sealing seat (2) in the axial direction; an annular dynamic ring seat (11) is arranged on an outer part of an outer wall of an end of the sleeve (1) in the inner cavity of the sealing seat (2), a main dynamic ring (12) is slidably arranged on an end of the dynamic ring seat (11) near the main static ring (4), an end of the main dynamic ring (12) is in abutment with the main static ring (4) to form a main seal, a step groove is arranged on an inner side of an end of the main dynamic ring (12) near the dynamic ring seat (11), a sealing groove (13) is formed between the step groove and an end face of the dynamic ring seat (11), and a second sealing ring (14) is arranged in the sealing groove (13).

2. The corrosion resistant double mechanical seal of claim 1, wherein: A flange cover (15) is arranged on the other end of the sealing seat (2), a plurality of connecting bolts (16) are arranged on the flange cover (15) and are distributed in the circumferential direction and are used for being connected to an end face of the sealing seat (2) in the axial direction, a second installation slot (17) is arranged on the flange cover (15), a secondary static ring (18) is arranged in the second installation slot (17), a secondary dynamic ring (19) is slidably arranged on the other end of the dynamic ring seat (11), and the secondary dynamic ring (19) is in abutment with the secondary static ring (18) in the circumferential direction to form a secondary seal.

3. The corrosion resistant double mechanical seal of the cartridge type of claim 1 or 2, wherein: An avoiding gap (20) is arranged on an outer wall of an end of the main static ring (4) away from the medium and is communicated with the positioning recess (9).

4. The corrosion resistant double mechanical seal of claim 2, wherein: The inner recessed end of the dynamic ring seat (11) is provided with a first dynamic ring groove (21), the inner circumferential wall of the first dynamic ring groove (21) is outwardly protruded and formed with a plurality of first transmission lugs (22), the outer wall of one end of the driving ring (12) is provided with a plurality of first transmission grooves (23) matched with each of the first transmission lugs (22); the other end of the dynamic ring seat (11) is inwardly recessed and provided with a second dynamic ring groove (24), the inner circumferential wall of the second dynamic ring groove (24) is outwardly protruded and formed with a plurality of second transmission lugs (25), the outer wall of one end of the driven ring (19) is provided with a plurality of second transmission grooves (26) matched with each of the second transmission lugs (25).

5. The corrosion resistant double mechanical seal of claim 4, wherein: The bottom of the first dynamic ring groove (21) is provided with a plurality of installation holes (27) distributed in the circumferential direction and penetrating to the bottom wall of the second dynamic ring groove (24), a plurality of springs (28) are distributed and fitted in the installation holes (27), and the two ends of the plurality of springs (28) respectively abut against the tail ends of the driving ring (12) and the driven ring (19).

6. The corrosion resistant double mechanical seal of claim 5, wherein: The side wall of the sealing seat (2) is provided with a liquid inlet through hole (29) and a liquid outlet through hole (30), the inner end of the liquid inlet through hole (29) is close to the main seal, and the inner end of the liquid outlet through hole (30) is close to the auxiliary seal.

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