Mechanical seal for high-pressure lubricating oil rotor pump

Abstract

The utility model provides a mechanical seal for a high-pressure lubricating oil rotor pump, which comprises a shaft sleeve, a movable ring seat is formed on the outer wall of one end of the shaft sleeve, a movable ring groove is arranged on the movable ring seat, a movable ring is movably assembled in the movable ring groove, a first sealing ring is arranged between the tail end of the movable ring and the bottom of the movable ring groove, and a flange cover is sleeved outside the other end of the shaft sleeve. One end, close to the moving ring, of the flange cover is hermetically provided with a static ring seat which is telescopic along the axial direction; an elastic compensation piece is arranged between the static ring seat and the flange cover; a static ring groove is formed in the end, away from the flange cover, of the static ring base, a static ring is movably assembled in the static ring groove, a second sealing ring is arranged between the tail end of the static ring and the bottom of the static ring groove, and the static ring abuts against the sealing end face of the movable ring. The end face, close to the static ring, of the movable ring is provided with a plurality of arc-shaped grooves distributed in the circumferential direction, and the outer sides of the arc-shaped grooves are open. The mechanical seal for the high-pressure lubricating oil rotor pump is simple in structure, convenient to install, small in axial size and capable of being suitable for sealing of high-pressure media.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal technical field, specifically, relate to a kind of mechanical seal for high-pressure lubricating oil rotor pump. BACKGROUND

[0002] Rotor pump is changed by the relative movement between rotor and pump body to work volume, and liquid is discharged by the extrusion of rotating rotor, while space is left on the other side, forming low pressure, so that liquid is continuously sucked in. When the rotor pump is running, after the liquid delivered by the inlet flows in, it moves from the low pressure area to the high pressure area in the pump cavity under the action of the two rotors in the pump body, and then flows out from the discharge port. Because the liquid pressure in the high pressure area is high, the liquid in the high pressure area flows into the bearing end of the gear box from the gap of the pump shaft hole wall, thereby the sealing ring for sealing has a large extrusion force. Therefore, a mechanical seal device needs to be added to seal the high-pressure medium.

[0003] To realize the application of high-pressure medium, the existing mechanical seal structure usually sets two sets of sealing components, i.e. double-end-face sealing structure, to realize double insurance. However, the double-end-face sealing structure is complex and troublesome to install, and needs to be matched with a flushing system, which is high in cost. In addition, the double-end-face mechanism inevitably increases the axial length of the entire mechanical seal, which is difficult to meet the requirements in the case of insufficient installation space. UTILITY MODEL CONTENTS

[0004] To overcome at least one defect in the above prior art, the utility model provides a kind of mechanical seal for high-pressure lubricating oil rotor pump, simple structure, easy to install, small axial size, and can be applied to the sealing of high-pressure medium.

[0005] The utility model provides a kind of mechanical seal for high-pressure lubricating oil rotor pump: including the shaft sleeve of the pump shaft outside, the outer wall of the shaft sleeve one end is formed with the annular dynamic ring seat of the outside convex, the dynamic ring seat is provided with dynamic ring groove, the dynamic ring groove is movably equipped with dynamic ring, and the tail end between the dynamic ring and the bottom of the dynamic ring groove is equipped with first sealing ring, the outside of the other end of the shaft sleeve is equipped with flange cover, the end of the flange cover near the dynamic ring is sealed and equipped with the static ring seat that can be telescopic along the axial direction, and the static ring seat is provided with elastic compensation member between the flange cover;The end of the static ring seat away from the flange cover is equipped with static ring groove, and the static ring groove is movably equipped with static ring, and the tail end between the static ring and the bottom of the static ring groove is equipped with second sealing ring, and the sealing end face of the static ring and the dynamic ring can be relatively rotated and abutted along the circumferential direction;The end face of the dynamic ring and the static ring is provided with a plurality of arc grooves distributed along the circumferential direction and opened on the outside.

[0006] Compared with the prior art, the utility model has the following advantages:

[0007] 1. In this structure, the fit between the dynamic ring and the dynamic ring seat, and between the stationary ring and the stationary ring seat, is not a hard fit. In other words, the dynamic ring and the stationary ring have better floating and self-adjusting effects, ensuring that the sealing surfaces are always tightly fitted under high pressure and ensuring stable sealing performance. Furthermore, the single-end face sealing structure in the above structure has a compact axial dimension, occupies little space, and has a simple structure and is easy to install.

[0008] 2. In the sealing structure of this utility model, a static ring compensation is adopted, that is, the elastic compensation component is stationary and will not be affected by moving parts or high-pressure media, thus ensuring a stable compensation force and ensuring the stability of sealing performance.

[0009] 3. In this utility model, multiple circumferentially distributed and externally open arc-shaped grooves are provided on the end face where the rotating ring and the stationary ring abut against each other. The arc-shaped groove structure here allows the medium to quickly enter the sealing surface through the arc-shaped grooves during the operation of the mechanical seal, increasing the lubrication effect of the sealing ring surface and preventing dry friction of the sealing surface. On the other hand, the multiple arc-shaped grooves can also improve the heat dissipation of the sealing ring under high pressure environment, avoid thermal deformation of the sealing ring, and ensure stable sealing performance.

[0010] As an improvement, a first stepped groove is provided on the inner wall of the flange cover near the end of the moving ring, and a second stepped groove is provided on the radially outer side of the stationary ring seat near the end of the flange cover, which slides with the first stepped groove. A rectangular sealing groove is formed between the first stepped groove and the second stepped groove. A third sealing ring and a PTFE retaining ring arranged axially are installed in the sealing groove, and the PTFE retaining ring is located at the end near the flange cover.

[0011] In a further improvement, an arc-shaped guide surface is provided on the radially outer side of the end of the stationary ring seat near the flange cover.

[0012] In a further improvement, a third step groove is provided on the radially outer side of the stationary ring seat, and the elastic compensation member is located between the bottom of the third step groove and the end of the flange cover; and an anti-rotation pin is provided on the end face of the flange cover, and an anti-rotation pin groove for the anti-rotation pin to engage is provided on the bottom wall of the third step groove.

[0013] In a further improvement, the elastic compensation component includes multiple springs, and multiple spring holes distributed circumferentially are provided on the end face of the flange cover. One end of each of the multiple springs is respectively fitted and positioned in the spring hole, and the other end of each spring abuts against the bottom wall of the third step groove.

[0014] Further, the outer convex of the inner circumferential wall of the dynamic ring groove is formed with a plurality of circumferentially distributed transmission lugs, and the outer wall of the dynamic ring is provided with a plurality of transmission grooves in sliding fit with the transmission lugs.

[0015] Further, the outer part of the shaft sleeve away from the dynamic ring seat is provided with a driving ring, the sidewall of the driving ring is provided with a plurality of tight screws in circumferential distribution and in inner end abutting fit with the pump shaft, the outer circumferential wall of the driving ring is formed with an annular positioning groove, and the outer end surface of the flange cover is connected with a plurality of limiting blocks in circumferential distribution, one end of each limiting block is respectively clamped and fitted in the positioning groove, so as to realize the pre-positioning of the mechanical seal working height.

[0016] The above-mentioned multiple improved advantages of the utility model will be specifically described in the following specific embodiment, and part of it becomes obvious from the description, or it is understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structure specially pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the half cut structure diagram of the mechanical seal for high-pressure lubricating oil rotor pump of the utility model;

[0018] Figure 2 It is Figure 1 It is the enlarged structure diagram of X place in the middle;

[0019] Figure 3 It is Figure 1 It is the enlarged structure diagram of Y place in the middle;

[0020] Figure 4 It is the structure diagram of the dynamic ring in the utility model.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] 1, shaft sleeve; 2, dynamic ring seat; 3, dynamic ring groove; 4, dynamic ring; 5, first sealing ring; 6, flange cover; 7, static ring seat; 8, elastic compensation part; 9, static ring groove; 10, static ring; 11, second sealing ring; 12, arc-shaped groove; 13, first step groove; 14, second step groove; 15, third sealing ring; 16, PTFE check ring; 17, guide surface; 18, third step groove; 19, anti-rotation pin; 20, anti-rotation pin groove; 21, spring hole; 22, transmission lug; 23, transmission groove; 24, anti-rotation lug; 25, anti-rotation groove; 26, driving ring; 27, tight screw; 28, positioning groove; 29, limiting block; 30, connecting screw. DETAILED DESCRIPTION

[0023] First, those skilled in the art should understand that the embodiments are only used to explain the technical principles of the application examples, and are not intended to limit the protection scope of the application examples. Those skilled in the art can adjust them as needed to adapt to specific application occasions.

[0024] In the description of the application examples, it should be noted that unless otherwise explicitly specified and limited, the terms "fixed", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application examples can be understood according to the specific circumstances.

[0025] The application will be further described in detail below with reference to the drawings and specific embodiments.

[0026] Referring to Figures 1-4 As shown in the figure, the application example discloses a mechanical seal for high-pressure lubricating oil rotor pump, which comprises a shaft sleeve 1 sleeved outside the pump shaft, and a sealing ring is arranged between one end of the shaft sleeve 1 and the outer wall of the pump shaft, and the other end is in transmission connection with the pump shaft.

[0027] The outer wall of one end of the shaft sleeve 1 is outwardly convexly formed with an annular dynamic ring seat 2, the axial end face of the dynamic ring seat 2 is inwardly recessed to be provided with an annular dynamic ring groove 3, a dynamic ring 4 is movably fitted in the dynamic ring groove 3, and a first sealing ring 5 is arranged between the tail end of the dynamic ring 4 and the bottom of the dynamic ring groove 3; a flange cover 6 is externally sleeved at the other end of the shaft sleeve 1, a static ring seat 7 which is axially expandable is sealingly fitted at one end of the flange cover 6 close to the dynamic ring 4, and an elastic compensation member 8 is arranged between the static ring seat 7 and the flange cover 6; a static ring groove 9 is arranged at one end of the static ring seat 7 away from the flange cover 6, a static ring 10 is movably fitted in the static ring groove 9, and a second sealing ring 11 is arranged between the tail end of the static ring 10 and the bottom of the static ring groove 9, and the sealing end faces of the static ring 10 and the dynamic ring 4 can relatively rotate in the circumferential direction to abut to form a sealing friction pair; in this structure, the cooperation between the dynamic ring 4 and the dynamic ring seat 2, and the cooperation between the static ring 10 and the static ring seat 7 are not hard cooperation, in other words, the dynamic ring 4 and the static ring 10 have better floating and self-adaptive adjustment effect, so as to ensure that the sealing surfaces are always closely attached in the high-pressure environment, and the sealing performance is stable; and in the above structure, the single-end-face sealing structure has compact axial dimension, small space occupation, and simple structure, and is convenient to install. In this structure, the dynamic ring seat 2 and the shaft sleeve 1 are integrally processed and formed, have high structural strength, and are suitable for high-pressure environment.

[0028] In another aspect, the sealing structure of the present embodiment adopts a static ring 10 compensation form, that is, the elastic compensation member 8 is static and will not be disturbed by the moving parts and high-pressure medium, thus always ensuring stable compensation force and in turn ensuring stable sealing performance.

[0029] More importantly, referring to the accompanying drawings Figure 4 In the structure of the present embodiment, the end surface of the dynamic ring 4 abutting against the static ring 10 is provided with a plurality of arc-shaped grooves 12 distributed in the circumferential direction and open on the outer side. The arc-shaped groove 12 structure enables the medium to quickly enter the sealing surface through the arc-shaped groove 12 during the operation of the mechanical seal, increases the lubricating effect of the sealing ring surface, and prevents dry friction of the sealing surface. In another aspect, the plurality of arc-shaped grooves 12 can also improve the heat dissipation of the sealing ring in a high-pressure environment, avoid thermal deformation of the sealing ring, and ensure stable sealing performance.

[0030] In the present embodiment, referring to the accompanying drawings Figure 3 A first stepped groove 13 is formed on the inner wall of the flange cover 6 near one end of the dynamic ring 4, and a second stepped groove 14 is arranged on the radially outer side of the static ring seat 7 and near one end of the flange cover 6, and the first stepped groove 13 and the second stepped groove 14 form a rectangular sealing groove therebetween. A third sealing ring 15 and a PTFE stop ring 16 are arranged in the sealing groove in the axial direction, and the PTFE stop ring 16 is located near one end of the flange cover 6. PTFE is used to prevent the sealing ring from being extruded under high pressure, thereby ensuring stable sealing performance. In this structure, the outer side wall surface of the first stepped groove 13 for accommodating the third sealing ring 15 and the PTFE stop ring 16 is polished, which better ensures the sealing performance under high pressure and prevents leakage due to rough machining surface.

[0031] In addition, continuing to refer to the accompanying drawings Figure 3 An arc-shaped guide surface 17 is arranged on the radially outer side of the static ring seat 7 near one end of the flange cover 6, which facilitates the installation of the third sealing ring 15 and the PTFE stop ring 16 and avoids scratching the inner surface of the third sealing ring 15 and the PTFE stop ring 16 during installation. In other embodiments, the guide surface 17 can also be a conical surface.

[0032] In the present embodiment, a third stepped groove 18 is further arranged on the radially outer side of the static ring seat 7, and the elastic compensation member 8 is arranged between the bottom of the third stepped groove 18 and the end of the flange cover 6. A anti-rotation pin 19 is arranged on the end surface of the flange cover 6, and an anti-rotation pin groove 20 is formed on the bottom wall of the third stepped groove 18 for accommodating the anti-rotation pin 19. Preferably, the elastic compensation member 8 includes a plurality of springs, and a plurality of spring holes 21 are formed on the end surface of the flange cover 6 in the circumferential direction. One end of each of the plurality of springs is positioned in each of the spring holes 21, and the other end of each of the plurality of springs abuts against the bottom wall of the third stepped groove 18. The plurality of springs are uniformly arranged in the circumferential direction, which ensures that the elastic compensation force is more uniform and stable.

[0033] In another aspect, referring to the accompanying drawings Figure 2 In this embodiment, a plurality of transmission lugs 22 are formed on the outer convex of the inner circumferential wall of the dynamic ring groove 3, and a plurality of transmission grooves 23 are formed on the outer wall of the dynamic ring 4 to slidably cooperate with the transmission lugs 22. The transmission lugs 22 are integrally formed with the dynamic ring seat 2, which is convenient to process and has high structural strength, thereby ensuring stable torque transmission.

[0034] Continuing to refer to the accompanying drawings Figure 2 Similarly, a plurality of anti-rotation lugs 24 are formed on the outer convex of the inner circumferential wall of the static ring groove 9, and the anti-rotation lugs 24 are integrally formed with the static ring seat 7. A plurality of anti-rotation grooves 25 are formed on the outer wall of the static ring 10 to slidably cooperate with the anti-rotation lugs 24. The anti-rotation lugs 24 are structured to better prevent the static ring 10 from rotating circumferentially under the action of the dynamic ring 4, thereby ensuring stable sealing performance. The integrally formed anti-rotation lugs 24 have high structural strength and good stability.

[0035] In the above structure, preferably, the transmission lugs 22, the transmission grooves 23, the anti-rotation lugs 24, and the anti-rotation grooves 25 are all four and are uniformly distributed circumferentially.

[0036] In this embodiment, referring again to the accompanying drawings Figure 1 The shaft sleeve 1 is drivingly connected with the pump shaft. Specifically, a driving ring 26 is sleeved on the outer end of the shaft sleeve 1 away from the dynamic ring seat 2. A plurality of tight screws 27 are arranged on the side wall of the driving ring 26 and are in tight abutment with the pump shaft. A plurality of connecting screws 30 are also arranged on the side wall of the driving ring 26 and are circumferentially staggered with the tight screws 27. The inner ends of the connecting screws 30 are in tight abutment with the outer wall of the shaft sleeve 1, thereby connecting the driving ring 26 with the shaft sleeve 1. The tight screws 27 connect the driving ring 26, the shaft sleeve 1, and the pump shaft, thereby achieving synchronous rotation. In this driving connection structure, the tight screws 27 are high-strength hard screws, which further ensure the reliability of the transmission under high pressure.

[0037] In addition, continuing to refer to the accompanying drawings Figure 1 An annular positioning groove 28 is formed on the outer circumferential wall of the driving ring 26, and a plurality of limiting blocks 29 are connected to the outer end face of the flange cover 6. One end of each limiting block 29 is fitted into the positioning groove 28, thereby achieving pre-positioning of the working height of the mechanical seal. It should be noted that the limiting blocks are only used for positioning during assembly and also serve as working height positioning. When the mechanical seal is installed to the rotor pump cavity according to the set position, it needs to be disassembled, otherwise it will affect the normal operation of the mechanical seal.

[0038] In the description of the application, the description referring to the terms "the embodiment", "some embodiments", and the like means that the specific features, mechanisms, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the 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 suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0039] The above description is merely specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in 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 mechanical seal for a high pressure lubricating oil rotor pump, characterized by: The application relates to a shaft sleeve (1) sleeved outside a pump shaft, an annular movable ring seat (2) is formed on the outer wall of one end of the shaft sleeve (1), a movable ring groove (3) is arranged on the movable ring seat (2), a movable ring (4) is movably arranged in the movable ring groove (3), a first sealing ring (5) is arranged between the tail end of the movable ring (4) and the bottom of the movable ring groove (3), a flange cover (6) is sleeved on the other end of the shaft sleeve (1), a static ring seat (7) which can be axially extended is sealingly arranged on one end of the flange cover (6) close to the movable ring (4), an elastic compensation element (8) is arranged between the static ring seat (7) and the flange cover (6), a static ring groove (9) is arranged on the end of the static ring seat (7) away from the flange cover (6), a static ring (10) is movably arranged in the static ring groove (9), a second sealing ring (11) is arranged between the tail end of the static ring (10) and the bottom of the static ring groove (9), the sealing end faces of the static ring (10) and the movable ring (4) can be relatively rotated in the circumferential direction and abut against each other, and a plurality of arc-shaped grooves (12) which are distributed in the circumferential direction and open on the outer side are arranged on the end face of the movable ring (4) and the static ring (10) abutting against each other.

2. The mechanical seal for a high-pressure lubricating oil rotor pump according to claim 1, characterized in that: A first stepped groove (13) is arranged on the inner wall of one end of the flange cover (6) close to the movable ring (4), a second stepped groove (14) which is in sliding fit with the first stepped groove (13) is arranged on the radial outer side of the static ring seat (7) close to the flange cover (6), a rectangular sealing groove is formed between the first stepped groove (13) and the second stepped groove (14), a third sealing ring (15) and a PTFE stop ring (16) which are arranged in the axial direction are arranged in the sealing groove, and the PTFE stop ring (16) is arranged on the end close to the flange cover (6).

3. The mechanical seal for a high-pressure lubricating oil rotor pump according to claim 2, characterized in that: An arc-shaped guide surface (17) is arranged on the radial outer side of one end of the static ring seat (7) close to the flange cover (6).

4. The mechanical seal for a high pressure lube rotor pump of claim 2, wherein: A third stepped groove (18) is further arranged on the radial outer side of the static ring seat (7), the elastic compensation element (8) is arranged between the bottom of the third stepped groove (18) and the end of the flange cover (6), a rotation prevention pin (19) is arranged on the end face of the flange cover (6), and a rotation prevention pin groove (20) for matching the rotation prevention pin (19) is arranged on the bottom wall of the third stepped groove (18).

5. The mechanical seal for a high-pressure lubricating oil rotor pump according to claim 4, characterized in that: The elastic compensation element (8) comprises a plurality of springs, a plurality of spring holes (21) which are distributed in the circumferential direction are arranged on the end face of the flange cover (6), one end of each of the plurality of springs is arranged in each spring hole (21), and the other end of each of the plurality of springs abuts against the bottom wall of the third stepped groove (18).

6. The mechanical seal for a high pressure lube rotor pump of claim 1, wherein: A plurality of transmission lugs (22) which are distributed in the circumferential direction are formed on the inner circumferential wall of the movable ring groove (3), a plurality of transmission grooves (23) which are in sliding fit with the transmission lugs (22) are arranged on the outer wall of the movable ring (4), a plurality of rotation prevention lugs (24) which are distributed in the circumferential direction are formed on the inner circumferential wall of the static ring groove (9), and a plurality of rotation prevention grooves (25) which are in sliding fit with the rotation prevention lugs (24) are arranged on the outer wall of the static ring (10).

7. The mechanical seal for a high-pressure lubricating oil rotor pump according to claim 1 or 6, characterized in that: The outer part of the shaft sleeve (1) far from the one end of the dynamic ring base (2) is equipped with a driving ring (26), the sidewall of the driving ring (26) is provided with a plurality of tight screws (27) which are distributed along the circumference and the inner end is abuttingly matched with the pump shaft; the outer circumferential wall of the driving ring (26) is formed with an annular positioning groove (28), the outer end surface of the flange cover (6) is connected with a plurality of limiting blocks (29) which are distributed along the circumference, one end of each limiting block (29) is respectively clamped and matched in the positioning groove (28) to realize the pre-positioning of the mechanical seal working height.

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