A mechanical seal structure with a bearing as a sealing end face

Abstract

The present invention relates to a mechanical seal structure with a bearing as a sealing end face, comprising an intermediate cavity, a bearing cavity, a bearing end cover, a sleeve, a bearing, a medium side compensation ring assembly and an atmosphere side compensation ring assembly, wherein a bearing is arranged in the bearing cavity, the outer ring of the bearing is fixedly connected to the inner wall of the bearing cavity, the inner ring of the bearing is fixedly connected to the sleeve, the medium side compensation ring assembly and the atmosphere side compensation ring assembly have the same structure, are symmetrically arranged on both sides of the inner and outer sides of the bearing, and the medium side compensation ring assembly and the atmosphere side compensation ring assembly respectively form an end face sealing friction pair with the inner ring end face of the bearing. Compared with the prior art, the present invention is suitable for equipment with a large shaft diameter and a small axial space, can not only be installed in a smaller sealing cavity, provide a more stable sealing environment, but also save costs.

Description

Technical Field

[0001] The invention relates to the technical field of sealing structure devices, and in particular to a mechanical sealing structure with a bearing as a sealing end face. Background Art

[0002] There are a large number of mechanical seal structures currently, most of which are connected to a stationary ring on the equipment, a moving ring on the rotating shaft, and springs are set axially between the moving ring and the stationary ring to ensure that the end face of the moving ring fits the end face of the stationary ring, and the moving ring can rotate relative to the stationary ring. Figure 2 As shown, the structure is a structure in which a long shaft sleeve is sleeved on the rotating shaft, and a bearing and an end face sealing mechanism are arranged outside the long shaft sleeve. The disadvantage of this structure is that it takes up a large space during installation and is not suitable for occasions with a small installation space, such as in a side agitator or a pump. The axial installation space is relatively small, and it is difficult to install the existing mechanical seal structure, and the cost of the mechanical seal is relatively high. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a mechanical sealing structure suitable for equipment with large shaft diameter and small axial space, which can not only be installed in a smaller sealing cavity to provide a more stable sealing environment, but also greatly save costs and use the bearing as the sealing end face.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A mechanical seal structure with a bearing as a sealing end face, comprising an intermediate cavity, a bearing cavity, a bearing end cover, a sleeve, a bearing, a medium-side compensation ring assembly and an atmosphere-side compensation ring assembly, wherein the intermediate cavity, the bearing cavity and the bearing end cover are connected in sequence, and a rotating shaft passes through the bearing end cover, the bearing cavity and the intermediate cavity in sequence, the sleeve is fixedly sleeved on the rotating shaft, the bearing is arranged in the bearing cavity, the outer ring of the bearing is fixedly connected to the inner wall of the bearing cavity, the inner ring of the bearing is fixedly connected to the sleeve, the medium-side compensation ring assembly and the atmosphere-side compensation ring assembly have the same structure and are symmetrically arranged on the inner and outer sides of the bearing, and end face sealing friction pairs are formed between the medium-side compensation ring assembly and the atmosphere-side compensation ring assembly and the inner ring end face of the bearing respectively.

[0006] Further, the medium side compensation ring assembly includes a medium side compensation ring, an O-ring, a spring and an anti-rotation pin are provided between the inner side of the medium side compensation ring and the intermediate cavity, and the outer side of the medium side compensation ring forms a friction pair with the inner ring end face of the bearing; the atmospheric side compensation ring assembly includes an atmospheric side compensation ring, an O-ring, a spring and an anti-rotation pin are provided between the outer side of the atmospheric side compensation ring and the bearing end cover, and the inner side of the atmospheric side compensation ring forms a friction pair with the inner ring end face of the bearing.

[0007] Furthermore, an inner end cover is also provided in the middle cavity, the two are connected by a hexagon socket screw, and an O-ring is provided at the connection.

[0008] Furthermore, an O-ring is provided between the inner end cover and the reactor, a labyrinth, a throttling bushing and a bushing pressure plate are provided on the inner diameter wall of the inner end cover, a small gap is provided between the inner diameter of the throttling bushing and the rotating shaft, and the outer portion is limited by a spring and a bushing pressure plate, and the bushing pressure plate is fixed to the bottom side of the inner end cover by a hexagon socket screw. A labyrinth is provided at the medium end to prevent particles in the medium from entering the sealing end face, and the sealing ring on the medium side is a spring isolation type to prevent particles from clogging the spring and causing sealing failure, and a large flow of flushing liquid is provided to flush the labyrinth to prevent particles from entering the sealing end face.

[0009] Furthermore, the bearing cavity is provided with a sealing liquid inlet and a sealing liquid outlet, and the sealing liquid inlet and the sealing liquid outlet are communicated with the atmosphere side chamber of the bearing cavity.

[0010] Furthermore, the sealing liquid entering the sealing liquid inlet includes lubricating oil or water. The bearing is used as a rotating ring of the mechanical seal, and the bearing is positioned by the outer ring. The sealing liquid inlet and the sealing liquid outlet provide sealing liquid to the mechanical seal through an external system to ensure the lubrication of the bearing, which can effectively reduce the temperature of the bearing, so that the mechanical seal can be used under high temperature conditions. The mechanical seal bearing can use an ordinary deep groove ball bearing, and the inner and outer sides of the inner ring of the bearing need to be axially higher than the outer ring. To achieve this requirement, a hard alloy wear-resistant layer can be welded on the inner ring of the bearing.

[0011] Furthermore, the bearing end cover further includes a pressure plate and a positioning piece, the positioning piece clamps the pressure plate at the lower side of the bearing end cover, the positioning piece is fixed to the side of the bearing end cover by a hexagon socket screw, and the bottom of the positioning piece is engaged with the shaft sleeve;

[0012] Furthermore, a skeleton oil seal mechanism is provided between the shaft sleeve and the bearing end cover.

[0013] Furthermore, the bearing end cover is also provided with a leak detection port, which is communicated with the chamber in the bearing end cover. The skeleton oil seal is used to prevent the seal from leaking directly into the atmosphere.

[0014] Furthermore, the intermediate cavity and the bearing cavity are connected by a hexagon socket screw, and an O-ring is provided at the connection;

[0015] The shaft sleeve is connected to the bearing through a key, and an O-ring is provided at the connection;

[0016] The shaft sleeve is fixedly connected to the rotating shaft through a top screw, and an O-ring is arranged at the connection.

[0017] The inner ring end face of the bearing is provided with a wear-resistant coating, such as hard alloy, silicon carbide and the like, to increase the service life.

[0018] The bearing of this sealing structure is a deep groove ball bearing, with friction pairs at both ends of the bearing. The end face of the compensation ring is pressed on the bearing, saving a static ring and the space for installing the bearing. The floating and following properties of the compensation ring are good to prevent the radial runout of the rotating shaft from affecting the seal. The end face of the mechanical seal is set at the bearing. Because the bearing has high precision, small runout, and the floating property of the compensation ring is good, the seal can be used in the best working environment, and is suitable for reactors and similar sealing equipment.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] (1) The bearing of the sealing structure is a deep groove ball bearing, with friction pairs at both ends of the bearing. The end face of the compensation ring is pressed on the bearing, saving a static ring and the space for installing the bearing. The floating and following properties of the compensation ring are good to prevent the radial runout of the rotating shaft from affecting the seal.

[0021] (2) The end face of the mechanical seal, i.e. the friction pair, is set at the bearing. Because the bearing has high precision, small runout, and good floating performance of the compensation ring, the seal can be used in the best working environment;

[0022] (3) The mechanical seal structure uses lubricating oil or water as the sealing liquid, which can effectively reduce the temperature of the bearing, so that the mechanical seal can be used under high temperature conditions;

[0023] (4) The main advantage of the mechanical seal structure is that the bearing is used as the sealing end face. When the seal structure is installed and used, it reduces the axial installation space and provides a more stable sealing environment;

[0024] (5) This structure can reduce the impact of temperature changes on sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a mechanical seal structure according to an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of an existing mechanical seal structure;

[0027] As shown in the figure: labyrinth 1, throttling bushing 2, bushing pressure plate 3, medium side compensation ring 4, bearing 5, key 6, atmosphere side compensation ring 7, skeleton oil seal mechanism 8, intermediate cavity 9, positioning piece 10, top screw 11, bearing end cover 12, leak detection port 13, inner end cover 14, shaft sleeve 15, bearing cavity 16, sealing liquid inlet 17, sealing liquid outlet 18. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example

[0030] Figure 2 It is a schematic diagram of an existing mechanical seal structure, which is a structure in which a long shaft sleeve 15 is sleeved on the rotating shaft, and a bearing 5 and an end face sealing mechanism are arranged outside the long shaft sleeve 15. The end face sealing mechanism is a double-end face mechanical seal structure. This structure requires a large space when installed and cannot be used in occasions with a small installation space, such as in a side agitator or a pump, where the axial installation space is relatively small, it is difficult to install and the cost is high.

[0031] To solve this problem, the present invention provides a mechanical seal structure with a bearing as a sealing end face, such as Figure 1 , including an intermediate cavity 9, a bearing cavity 16, a bearing end cover 12, a sleeve 15, a bearing 5, a medium-side compensation ring assembly and an atmosphere-side compensation ring assembly. The intermediate cavity 9, the bearing cavity 16 and the bearing end cover 12 are connected in sequence, the rotating shaft passes through the bearing end cover 12, the bearing cavity 16 and the intermediate cavity 9 in sequence, the sleeve 15 is fixedly sleeved on the rotating shaft, the bearing 5 is arranged in the bearing cavity 16, the outer ring of the bearing 5 is fixedly connected to the inner wall of the bearing cavity 16, the inner ring of the bearing 5 is fixedly connected to the sleeve 15, the medium-side compensation ring assembly and the atmosphere-side compensation ring assembly have the same structure, and are symmetrically arranged on the inner and outer sides of the bearing 5, and the medium-side compensation ring assembly and the atmosphere-side compensation ring assembly respectively form end face sealing friction pairs with the inner ring end faces of the bearing 5.

[0032] Among them, the middle cavity 9 and the bearing cavity 16 are connected by a hexagon socket screw, and an O-ring is provided at the connection; the sleeve 15 is connected to the bearing 5 by a key 6, and an O-ring is provided at the connection; the sleeve 15 is fixedly connected to the rotating shaft by a top screw 11, and an O-ring is provided at the connection, and there is also a gap between the sleeve 15 and the rotating shaft.

[0033] The medium side compensation ring assembly includes a medium side compensation ring 4, an O-ring and a spring or an anti-rotation pin are arranged between the inner side of the medium side compensation ring 4 and the intermediate cavity 9, and the outer side of the medium side compensation ring 4 forms a friction sealing end face with the inner ring end face of the bearing 5; the spring provides compensation force, and the O-ring serves as an auxiliary seal. The atmosphere side compensation ring assembly includes an atmosphere side compensation ring 7, an O-ring and a spring or an anti-rotation pin are arranged between the outer side of the atmosphere side compensation ring 7 and the bearing end cover 12, and the inner side of the atmosphere side compensation ring 7 forms a friction sealing end face with the inner ring end face of the bearing 5.

[0034] An inner end cover 14 is also provided in the middle cavity 9, and the two are connected by hexagon socket screws, and an O-ring is provided at the connection. An O-ring is provided in the middle of the inner end cover 14, and a labyrinth 1, a throttling bushing 2 and a bushing pressure plate 3 are provided at the inner diameter. There is a small gap between the bottom surface of the throttling bushing 2 and the rotating shaft, and the left and right sides are limited by springs and bushing pressure plates 3 respectively. The bushing pressure plate 3 is fixed to the bottom side of the inner end cover 14 by hexagon socket screws. The mechanical seal is a face-to-face balanced built-in mechanical seal. A labyrinth is provided at the medium end to prevent particles in the medium from entering the sealing end face. The sealing ring on the medium side is a spring isolation type to prevent particles from clogging the spring and causing sealing failure, and a large flow of flushing liquid is provided to flush the labyrinth to prevent particles from entering the sealing end face.

[0035] In addition, a sealing liquid inlet 17 and a sealing liquid outlet 18 may be provided on the bearing cavity 16, and the sealing liquid inlet 17 and the sealing liquid outlet 18 are in communication with the cavity of the bearing cavity 16. The sealing liquid entering the sealing liquid inlet 17 includes lubricating oil or water. The bearing is used as a rotating ring of a mechanical seal, and the bearing is positioned by the outer ring. The sealing liquid inlet and the sealing liquid outlet provide sealing liquid to the mechanical seal through an external system to ensure the lubrication of the bearing, which can effectively reduce the temperature of the bearing and enable the mechanical seal to be used under high temperature conditions. The mechanical seal bearing can use an ordinary deep groove ball bearing, and the inner and outer sides of the inner ring of the bearing need to be axially higher than the outer ring. To meet this requirement, a hard alloy wear-resistant layer can be welded on the inner ring of the bearing.

[0036] The bearing end cover 12 also includes a pressure plate and a positioning piece 10. The positioning piece 10 clamps the pressure plate at the lower side of the bearing end cover 12. The positioning piece 10 is fixed to the side of the bearing end cover 12 by a hexagon socket screw. The lower part of the positioning piece 10 is engaged with the shaft sleeve 15. A skeleton oil seal mechanism 8 is also provided between the shaft sleeve 15 and the bearing end cover 12 for sealing. The bearing end cover 12 is also provided with a leak detection port 13, which is communicated with the chamber in the bearing end cover 12. The skeleton oil seal can prevent the seal from leaking directly into the atmosphere.

[0037] The dynamic ring of the sealing structure is a deep groove ball bearing, and both ends of the bearing are friction pairs. The end face of the compensation ring is pressed on the bearing, saving a static ring and the space for installing the bearing. The compensation ring has good floating and following properties to prevent the radial runout of the rotating shaft from affecting the seal. The end face of the mechanical seal is set at the bearing. Because the bearing has high precision and small runout, and the compensation ring has good floating properties, the seal can be used in the optimal working environment.

[0038] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A mechanical seal structure with a bearing as a sealing end face, characterized in that: It comprises an intermediate cavity (9), a bearing cavity (16), a bearing end cover (12), a shaft sleeve (15), a bearing (5), a medium side compensation ring assembly and an atmosphere side compensation ring assembly, The intermediate cavity (9), the bearing cavity (16) and the bearing end cover (12) are connected in sequence; the rotating shaft passes through the bearing end cover (12), the bearing cavity (16) and the intermediate cavity (9) in sequence; the shaft sleeve (15) is fixedly sleeved on the rotating shaft; the bearing (5) is arranged in the bearing cavity (16); the outer ring of the bearing (5) is fixedly connected to the inner wall of the bearing cavity (16); and the inner ring of the bearing (5) is fixedly connected to the shaft sleeve (15); The medium-side compensation ring assembly and the atmosphere-side compensation ring assembly have the same structure and are symmetrically arranged on the inner and outer sides of the bearing (5), and an end face sealing friction pair is formed between the medium-side compensation ring assembly and the atmosphere-side compensation ring assembly and the inner ring end face of the bearing (5); An inner end cover (14) is also provided inside the intermediate cavity (9), and the two are connected by hexagon socket screws, and an O-ring is provided at the connection; A skeleton oil seal mechanism (8) is also provided in the chamber between the shaft sleeve (15) and the bearing end cover (12).

2. A mechanical seal structure with a bearing as a sealing end face according to claim 1, characterized in that: The medium-side compensation ring assembly comprises a medium-side compensation ring (4), an O-ring, a spring and an anti-rotation pin are provided between the inner side of the medium-side compensation ring (4) and the intermediate cavity (9), and the outer side of the medium-side compensation ring (4) forms a friction pair with the inner ring end face of the bearing (5); The atmospheric side compensation ring assembly comprises an atmospheric side compensation ring (7), an O-ring, a spring and an anti-rotation pin are provided between the outer side of the atmospheric side compensation ring (7) and the bearing end cover (12), and the inner side of the atmospheric side compensation ring (7) forms a friction pair with the inner ring end face of the bearing (5).

3. A mechanical seal structure with a bearing as a sealing end face according to claim 1, characterized in that: An O-ring is provided between the inner end cover (14) and the reactor, and a labyrinth (1), a throttling bushing (2) and a bushing pressure plate (3) are provided on the inner diameter wall of the inner end cover (14). A small gap is provided between the inner diameter of the throttling bushing (2) and the rotating shaft, and the outside is limited by a spring and a bushing pressure plate (3). The bushing pressure plate (3) is fixed to the inner end cover (14) by a hexagon socket screw.

4. A mechanical seal structure with a bearing as a sealing end face according to claim 1, characterized in that: The bearing cavity (16) is provided with a sealing liquid inlet (17) and a sealing liquid outlet (18), and the sealing liquid inlet (17) and the sealing liquid outlet (18) are in communication with the atmosphere-side chamber of the bearing cavity (16).

5. A mechanical seal structure with a bearing as a sealing end face according to claim 4, characterized in that: The sealing liquid entering the sealing liquid inlet (17) includes lubricating oil or water.

6. A mechanical seal structure with a bearing as a sealing end face according to claim 1, characterized in that: The bearing end cover (12) further comprises a pressure plate and a positioning piece (10) outside the bearing end cover, and the positioning piece (10) is fixed to the side of the bearing end cover (12) by means of a hexagon socket screw.

7. A mechanical seal structure with a bearing as a sealing end face according to claim 1, characterized in that: The bearing end cover (12) is also provided with a leak detection port (13), and the leak detection port (13) is communicated with the chamber in the bearing end cover (12).

8. The mechanical seal structure with a bearing as a sealing end face according to claim 1, characterized in that: The intermediate cavity (9) and the bearing cavity (16) are connected by means of hexagon socket screws, and an O-ring is provided at the connection; The shaft sleeve (15) is connected to the bearing (5) via a key (6), and an O-ring is provided at the connection; The shaft sleeve (15) is fixedly connected to the rotating shaft via a top screw (11), and an O-ring is provided at the connection; The inner ring end surface of the bearing (5) is provided with a wear-resistant coating.

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