High-sealing-performance shaft end mechanical sealing device

Abstract

The invention discloses a high-sealing-performance shaft end mechanical sealing device, which relates to the technical field of shaft end sealing, and comprises a shaft sleeve arranged on the outer side of the circumference of a driving shaft, a rotary sealing gland is arranged at one end outside the shaft sleeve, a fixed sealing ring is arranged at one end of the rotary sealing gland, and a flange plate is arranged at one end of the fixed sealing ring. A sealing shell is arranged at one end of the flange plate, a bearing is arranged at one end of the sealing shell, bearing seats are arranged outside the bearing, and a nozzle is arranged outside one bearing seat. By arranging the multiple O-shaped rings and the oil seal rings, the sealing performance is effectively improved, leakage of liquid or gas is prevented, and double protection of dynamic sealing and static sealing is achieved through precise matching of the rotary sealing gland and the fixed sealing ring and sealing design among the flange plate, the sealing shell and the shaft sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of shaft end sealing, and in particular to a shaft end mechanical sealing device with high sealing performance. Background Art

[0002] In the food and pharmaceutical industries, the rotary shaft seals of rotating equipment (such as agitators, centrifugal pumps, mixers, etc.) are of great significance. As these industries have extremely strict requirements for hygiene and safety, the sealing device must not only effectively prevent the leakage of the medium, but also prevent external pollutants (such as dust, moisture, particles, etc.) from entering the production process, thereby ensuring the safe operation of the equipment and meeting high cleanliness requirements.

[0003] As a highly efficient rotary sealing device, the shaft end mechanical seal effectively prevents the internal medium (such as liquid, gas) of the equipment from leaking to the outside through the high-precision fit of the dynamic ring and the static ring. It is particularly suitable for high-pressure, high-speed or hazardous medium processing occasions. At the same time, it can also effectively prevent external pollutants from invading the interior of the equipment to ensure stable operation of the equipment, which is particularly important in environments with extremely high cleanliness requirements such as the food and pharmaceutical industries.

[0004] However, the shaft end mechanical seal may not be able to achieve complete sealing under certain conditions. For example, due to the tiny gap between the dynamic ring and the static ring, a small amount of medium may leak in the initial stage. Although this trace leakage is normal in most occasions, it may still cause hidden dangers when handling high-risk media (such as highly toxic gases). In addition, with the long-term operation of the equipment, the sealing surface will gradually wear due to friction, and the sealing performance will decrease, which may cause serious leakage.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In view of the problems in the related art, the present invention proposes a high-sealing shaft end mechanical seal device to overcome the above technical problems existing in the related art.

[0007] To this end, the specific technical solution adopted by the present invention is as follows:

[0008] A high-sealing shaft end mechanical seal device, comprising a shaft sleeve arranged outside the circumference of a driving shaft, a rotating sealing cover arranged at one end of the shaft sleeve, a flange arranged at the outer circumference of the shaft sleeve, a fixed sealing ring embedded on the end surface of the flange close to the rotating sealing cover, and a plurality of springs for pushing the fixed sealing ring to press the rotating sealing cover are arranged in the flange;

[0009] A middle spring seat is provided in the middle of the shaft sleeve, an annular mounting groove is provided in the end surface of the middle spring seat away from the rotating seal gland, a pressure ring is movably embedded in the annular mounting groove, a coil spring is provided between the pressure ring and the bottom of the annular mounting groove, a sealing housing is sealedly connected to the side of the flange away from the rotating seal gland, and a middle sealing ring is embedded between the sealing housing and the shaft sleeve; the coil spring drives the pressure ring to push the middle sealing ring, the sealing housing and the shaft sleeve to respectively achieve reliable sealing;

[0010] A bearing seat is arranged on the shaft sleeve at a side of the sealing housing away from the flange; a transmission ring is sleeved on the end of the shaft sleeve passing through the bearing seat.

[0011] As a preferred solution, an end sealing ring matching with the drive shaft is arranged inside one end of the rotary sealing gland, and a first O-ring is arranged between the drive shaft and the sleeve;

[0012] A retaining ring and a second O-ring are arranged between the rotary sealing gland and the shaft sleeve.

[0013] As a preferred solution, a first sealing ring is provided on the fitting surface between the flange and the fixed sealing ring, and a second sealing ring is provided between the flange and the sealing housing.

[0014] As a preferred solution, a thrust ring is provided between the fixed sealing ring and the spring, and all the ends of the spring are connected to the end surface of the thrust ring.

[0015] As a preferred solution, a plurality of guide holes are provided in the flange, a plurality of guide rods are movably provided in the guide holes, and the guide rods pass through the thrust ring and are connected to the fixed sealing ring.

[0016] As a preferred solution, a limiting cylinder for limiting the edge of the fixed sealing ring is embedded in the flange.

[0017] As a preferred solution, a fixing plate is provided at one end of the bearing seat away from the flange through a first bolt, and a limiting groove matching with the fixing plate is provided on the shaft sleeve.

[0018] As a preferred solution, the sealing housing is provided with screws connected to the flange.

[0019] The beneficial effects of the present invention are:

[0020] The present invention realizes dual protection of dynamic sealing and static sealing through the precise matching of the rotating sealing cover and the fixed sealing ring, as well as the sealing design between the flange, the sealing housing and the sleeve. The synergistic effect of the thrust ring and the spring effectively absorbs the axial thrust, reduces the wear between components, and further improves the operating stability and service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 2 is a schematic structural diagram of a high-sealing shaft end mechanical sealing device according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0024] Figure 3 4 is a side view of a high-sealing shaft end mechanical sealing device according to an embodiment of the present invention.

[0025] In the figure:

[0026] 1. Drive shaft; 2. Bushing; 3. Rotary seal gland; 4. Flange; 5. Sealing housing; 6. Bearing; 7. Bearing seat; 8. Oil nozzle; 9. Fixed seal ring; 10. First O-ring; 11. Retaining ring; 12. Second O-ring; 13. First seal ring; 14. Second seal ring; 15. Limit cylinder; 16. Thrust ring; 17. Spring; 18. Middle seal ring; 19. Pressure ring; 20. Coil spring; 21. Screw; 22. Fixed plate; 23. First bolt; 24. Middle spring seat; 25. Transmission ring. DETAILED DESCRIPTION

[0027] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] According to an embodiment of the present invention, a shaft end mechanical sealing device with high sealing performance is provided.

[0029] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 3As shown, the high-sealing shaft end mechanical seal device according to the embodiment of the present invention comprises a sleeve 2 arranged outside the circumference of a driving shaft 1, a rotary sealing cover 3 is arranged at one end of the sleeve 2, a flange 4 is arranged on the outer circumference of the sleeve 2, a fixed sealing ring 9 is embedded on the end face of the flange 4 close to the rotary sealing cover, and a limiting cylinder 15 is embedded in the flange 4 to limit the edge of the fixed sealing ring 9. The flange 4 is provided with a plurality of springs 17 for pushing the fixed sealing ring 9 to press the rotary sealing cover; a thrust ring 16 is arranged between the fixed sealing ring 9 and the spring 17, and all ends of the springs 17 are connected to the end face of the thrust ring 16. The flange 4 is provided with a plurality of guide holes, and a plurality of guide rods are movably arranged in the guide holes, and the guide rods pass through the thrust ring 16 and are connected to the fixed sealing ring 9.

[0030] A middle spring seat 24 is sleeved in the middle of the shaft sleeve 2, and an annular mounting groove is provided in the end surface of the middle spring seat 24 away from the rotating seal gland 3, a pressure ring 19 is movably embedded in the annular mounting groove, and a coil spring 20 is provided between the pressure ring 19 and the bottom of the annular mounting groove. A sealing housing 5 is sealed and connected to the side of the flange 4 away from the rotating seal cover, and the sealing housing 5 is provided with a screw 21 connected to the flange 4. A middle sealing ring 18 is embedded between the sealing housing 5 and the shaft sleeve 2; the coil spring 20 drives the pressure ring 19 to push the middle sealing ring 18 and the sealing housing 5 and the shaft sleeve 2 to achieve reliable sealing respectively;

[0031] A bearing seat 7 is provided on the shaft sleeve 2 at the side of the sealing housing 5 away from the flange 4, and an oil nozzle 8 is provided on the bearing seat 7 for supplying lubricating oil to lubricate the bearing 6 therein; a fixing plate 22 is provided at one end of the bearing seat 7 away from the flange 4 through a first bolt 23, and a limiting groove matching the fixing plate 22 is provided on the shaft sleeve 2. A transmission ring 25 is sleeved on the end of the shaft sleeve 2 passing through the bearing seat 7.

[0032] An end seal ring matching the drive shaft 1 is disposed inside one end of the rotary seal gland 3, a first O-ring 10 is disposed between the drive shaft 1 and the shaft sleeve 2; a retaining ring 11 and a second O-ring 12 are disposed between the rotary seal gland 3 and the shaft sleeve 2. A first seal ring 13 is disposed on the mating surface between the flange 4 and the fixed seal ring 9, and a second seal ring 14 is disposed between the flange 4 and the sealing housing 5.

[0033] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below.

[0034] In actual application, the shaft sleeve 2 and the rotary seal gland 3 are first driven to work by the rotation of the drive shaft 1. The rotary seal gland 3 and the fixed seal ring 9 form a first seal. The sealing performance is further enhanced by multiple sealing structures such as the fixed seal ring 9 and the first seal ring 13. At the same time, the fixed seal ring 9 is connected to other components by the flange 4 to form a static seal. The bearing 6 and the bearing seat 7 are designed to support and reduce the friction and vibration of the drive shaft 1. The thrust ring 16 and the spring 17 are used to absorb the axial thrust and protect the sealing device from damage.

[0035] To sum up, with the help of the above-mentioned technical scheme of the present invention, the present invention realizes the dual protection of dynamic sealing and static sealing through the precise matching of the rotating sealing cover 3 and the fixed sealing ring 9, and the sealing design between the flange 4, the sealing housing 5 and the sleeve 2, and through the synergistic effect of the thrust ring 16 and the spring 17, the axial thrust is effectively absorbed, the wear between the components is reduced, and the operating stability and service life of the device are further improved; the present invention forms a dead angle sealing design with the medium side, effectively avoiding the intrusion or residue of the medium, and greatly improving the reliability of the sealing device under special working conditions.

[0036] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-sealing shaft end mechanical seal device, comprising a sleeve arranged outside the circumference of a drive shaft, characterized in that: A rotary sealing gland is arranged at one end of the shaft sleeve, a flange is arranged on the outer periphery of the shaft sleeve, a fixed sealing ring is embedded on the end surface of the flange close to the rotary sealing gland, and a plurality of springs are arranged in the flange to push the fixed sealing ring to press the rotary sealing gland tightly; A middle spring seat is provided in the middle of the shaft sleeve, an annular mounting groove is provided in the end surface of the middle spring seat away from the rotating seal gland, a pressure ring is movably embedded in the annular mounting groove, a coil spring is provided between the pressure ring and the bottom of the annular mounting groove, a sealing housing is sealedly connected to the side of the flange away from the rotating seal gland, and a middle sealing ring is embedded between the sealing housing and the shaft sleeve; the coil spring drives the pressure ring to push the middle sealing ring, the sealing housing and the shaft sleeve to respectively achieve reliable sealing; A bearing seat is arranged on the shaft sleeve at a side of the sealing housing away from the flange; a transmission ring is sleeved on the end of the shaft sleeve passing through the bearing seat.

2. A high-sealing shaft end mechanical seal device according to claim 1, characterized in that: An end sealing ring matching the drive shaft is arranged inside one end of the rotary sealing gland, and a first O-ring is arranged between the drive shaft and the sleeve; A retaining ring and a second O-ring are arranged between the rotary sealing gland and the shaft sleeve.

3. A high-sealing shaft end mechanical seal device according to claim 2, characterized in that: A first sealing ring is arranged on the fitting surface between the flange and the fixed sealing ring, and a second sealing ring is arranged between the flange and the sealing housing.

4. A high-sealing shaft end mechanical seal device according to claim 3, characterized in that: A thrust ring is arranged between the fixed sealing ring and the spring, and all ends of the springs are connected to the end surface of the thrust ring.

5. A high-sealing shaft end mechanical seal device according to claim 4, characterized in that: A plurality of guide holes are arranged in the flange, a plurality of guide rods are movably arranged in the guide holes, and the guide rods pass through the thrust ring and are connected with the fixed sealing ring.

6. A high-sealing shaft end mechanical seal device according to claim 5, characterized in that: A limiting cylinder for limiting the edge of the fixed sealing ring is embedded in the flange.

7. A high-sealing shaft end mechanical seal device according to claim 6, characterized in that: A fixing plate is provided at one end of the bearing seat away from the flange through a first bolt, and a limiting groove matched with the fixing plate is provided on the shaft sleeve.

8. A high-sealing shaft end mechanical seal device according to claim 5, characterized in that: The sealing shell is provided with screws connected with the flange.

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