A mechanical seal

Abstract

This application relates to a mechanical seal, belonging to the technical field of sealing structures. It includes a dynamic ring assembly with a dynamic ring, a static ring assembly with a static ring, and a collar. The collar is sleeved on the dynamic ring and rotates with the dynamic ring. A plurality of fan blades are arranged on the outer circumferential surface of the collar. There is an anti-friction gap between the collar and the static ring; bristles for cleaning the static ring assembly are arranged on one side of the fan blade close to the static ring. After the water pump is started, the rotating shaft drives the dynamic ring to rotate, the dynamic ring drives the collar to rotate, and the fan blades on the collar stir the water flow, stirring up the precipitated impurities. Moreover, the fan blades are similar to fan blades and push the stirred impurities away, thereby cleaning the impurities on the dynamic ring and the static ring; since the collar rotates with the dynamic ring, after there is an anti-friction gap between the collar and the static ring, it is not easy for the collar and the static ring to contact, reducing the wear of the collar and the static ring.

Description

Technical Field

[0001] This application relates to the technical field of sealing structures, and particularly to a mechanical seal. Background Art

[0002] A mechanical seal is a shaft seal device for rotating machinery and is commonly used in equipment such as centrifugal pumps, centrifuges, reactors, and compressors.

[0003] In the water pump of a waste treatment station, it is necessary to use the water pump to transport the landfill leachate medium. Since there are many particulate impurities in the landfill leachate medium, the impurities are easy to precipitate between the dynamic ring and the static ring and form mud covering the friction surfaces of the dynamic ring and the static ring. When the mechanical seal is in use, due to the blockage of the mud, no water enters between the dynamic ring and the static ring, and the friction between the dynamic ring and the static ring is dry friction. After long-term use, the dynamic ring and the static ring wear quickly, and the dynamic ring and the static ring generate high temperatures (300 - 400 degrees Celsius) due to friction, which is easy to burn the rubber sealing ring in the mechanical seal, thus damaging the mechanical seal.

[0004] In the related art, a common solution is to install a flushing mechanism in the water pump to flush the dynamic ring and the static ring and wash away the mud and impurities covering the dynamic ring and the static ring.

[0005] In view of the above related art, the inventor believes that after adding a flushing mechanism to the water pump, the overall structure of the water pump needs to be modified, and there are many auxiliary devices for the flushing mechanism, resulting in a large cost. Summary of the Invention

[0006] In order to reduce the cost of cleaning impurities at the dynamic ring and the static ring, this application provides a mechanical seal.

[0007] A mechanical seal provided by this application adopts the following technical solution:

[0008] A mechanical seal includes a dynamic ring assembly having a dynamic ring, a static ring assembly having a static ring, and a collar. The collar is sleeved on the dynamic ring and rotates with the dynamic ring. A plurality of fan blades are provided on the outer circumferential surface of the collar, and there is an anti-friction gap between the collar and the static ring; bristles for cleaning the static ring assembly are provided on one side of the fan blade close to the static ring.

[0009] By adopting the above technical solution, when the water pump is started, the rotating shaft drives the moving ring to rotate, the moving ring drives the sleeve ring to rotate, and the blades on the sleeve ring stir the water flow to stir up the impurities deposited on the moving ring and the static ring, and the blades are similar to fan blades to push away the stirred impurities, thereby flushing away the impurities that fall between the moving ring and the static ring; because the sleeve ring rotates with the moving ring, there is an anti-friction gap between the sleeve ring and the static ring, so that the sleeve ring and the static ring are not easy to contact, reducing the wear of the sleeve ring and the static ring. When the sleeve ring drives the blades to rotate, the bristles rotate with the blades, and the bristles can brush off the more stubborn impurities on the static ring assembly, making it difficult for the impurities to adhere to the static ring assembly.

[0010] Optionally, the fan blade is arranged obliquely on the ring; the end of the fan blade away from the ring is a bent end, the bent end is bent toward the outer ring surface of the ring, and the bending direction of the bent end is opposite to the rotation direction of the moving ring.

[0011] By adopting the above technical solution, the fan blades are tilted to make the fan blades stir the water flow more effectively; when impurities want to fall on the moving ring or the static ring from other positions, the rotating fan blades will knock out the impurities, and after the bending direction of the bent end is opposite to the rotation direction of the moving ring, the arc surface of the bent end will hit the impurities, making it easier to knock the impurities out.

[0012] Optionally, the end surface of the bent end away from the collar has an inclined surface, and the inclined surface is arranged away from the stationary ring.

[0013] By adopting the above technical solution, when the fan rotates, the inclined surface also rotates and becomes a knock-off surface, so that the knock-off surface is inclined in the direction away from the static ring. When the knock-off surface hits the impurities, the impurities are more likely to fly in the direction away from the static ring, making it difficult for the impurities to fall on the static ring and the dynamic ring.

[0014] Optionally, the bristles are arranged on the curved end.

[0015] By adopting the above technical solution, the bending end is far away from the moving ring, and the bristles are not easy to wear the moving ring after being arranged at the bending end.

[0016] Optionally, a retraction block is rotatably sleeved on the dynamic ring, one end face of the retraction block abuts against the static ring, and the other end face abuts against the sleeve ring.

[0017] By adopting the above technical solution, since the two ends of the retraction block are respectively in contact with the collar and the static ring, the retraction block will rotate with the collar. When the dynamic ring is worn, the retraction block pushes the collar to move on the dynamic ring, so that the collar and the static ring always maintain an anti-friction gap. In addition, the retraction block is located above the contact point between the dynamic ring and the static ring. As the retraction block rotates with the collar, it will push away larger impurities that fall on the static ring.

[0018] Optionally, the collar is provided with a mounting groove for inserting the retracting block, and one end of the retracting block away from the stationary ring is rotatably inserted into the mounting groove; the diameter of the mounting groove is larger than the diameter of the moving ring.

[0019] By adopting the above technical solution, the retracting block is inserted into the mounting groove, so that the position between the retracting block and the collar is stable; in addition, the diameter of the mounting groove is larger than the diameter of the moving ring, so that after the retracting block is inserted into the mounting groove, the inner circumferential wall of the retracting block does not abut against the moving ring.

[0020] Optionally, the moving ring is provided with a plurality of connecting blocks, and the collar is provided with a plurality of fitting grooves for embedding the plurality of connecting blocks, and the plurality of fitting grooves correspond to the plurality of connecting blocks one by one.

[0021] By adopting the above technical solution, the collar is connected to the moving ring through the connecting blocks, so that the moving ring can more easily drive the collar to rotate together.

[0022] Optionally, the moving ring is provided with a sliding groove for embedding the connecting block, and the connecting block slides axially along the moving ring in the sliding groove.

[0023] By adopting the above technical solution, since the retracting block will push the collar to move on the moving ring, and the connecting block slides in the sliding groove, the collar can move more smoothly on the moving ring.

[0024] Optionally, the mounting groove is communicated with the sliding groove, and the retracting block abuts against the connecting block.

[0025] By adopting the above technical solution, when the retracting block pushes the collar to move on the moving ring, the retracting block also pushes the connecting block, and the connecting block pushes the collar, so that the retracting block can more easily push the collar to move on the moving ring.

[0026] Optionally, the moving ring assembly is provided with a plurality of elastic flaps for always pushing the collar towards the stationary ring, the plurality of elastic flaps correspond to the plurality of connecting blocks one by one, and the stationary ring is provided with a plurality of card slots for embedding the ends of the plurality of elastic flaps, and the plurality of card slots correspond to the plurality of fitting grooves one by one.

[0027] By adopting the above technical solution, the elastic flaps make the collar always have a tendency to move closer to the stationary ring, so that the retracting block abuts tightly against the collar; in addition, the plurality of card slots correspond to the plurality of fitting grooves. During installation, the collar first abuts against the elastic flaps, that is, the ends of the elastic flaps first embed into the card slots. At this time, the fitting grooves correspond to the connecting blocks. Moving the collar towards the stationary ring can make the connecting blocks enter the fitting grooves, thus facilitating the installation of the collar and the moving ring.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. When the water pump is started, the rotating shaft drives the moving ring to rotate, and the moving ring drives the sleeve ring to rotate. The blades on the sleeve ring stir the water flow, stirring up the impurities deposited on the moving ring and the static ring. The blades are similar to fan blades, which push away the stirred impurities, thereby flushing away the impurities that fall between the moving ring and the static ring. Since the sleeve ring rotates with the moving ring, there is an anti-friction gap between the sleeve ring and the static ring, which makes it difficult for the sleeve ring and the static ring to contact each other, reducing the wear of the sleeve ring and the static ring. When the sleeve ring drives the blades to rotate, the bristles rotate with the blades, and the bristles can brush off the more stubborn impurities on the static ring assembly, making it difficult for the impurities to adhere to the static ring assembly.

[0030] 2. Since the two ends of the retraction block are respectively in contact with the sleeve ring and the static ring, the retraction block will rotate with the sleeve ring. When the dynamic ring is worn, the retraction block pushes the sleeve ring to move on the dynamic ring, so that the sleeve ring and the static ring always maintain an anti-friction gap;

[0031] 3. Since the retraction block pushes the collar to move on the moving ring, the connecting block slides in the sliding groove, making the collar move more smoothly on the moving ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a cross-sectional view of a mechanical seal according to an embodiment of the present application.

[0033] Figure 2 yes Figure 1 A is an enlarged view of the middle image.

[0034] Figure 3 It is a schematic diagram of the structure of the ring of an embodiment of the present application.

[0035] Figure 4 It is a schematic diagram of the ring after rotation according to the embodiment of the present application.

[0036] Figure 5 It is an exploded view of the rollback block and the collar according to an embodiment of the present application.

[0037] Figure 6 This is a schematic diagram of the structure of the connecting block and the connecting groove of the embodiment of the present application.

[0038] Explanation of the accompanying drawings: 1. Moving ring assembly; 11. Moving ring seat; 12. Spring; 13. Moving ring; 14. Sliding groove; 15. Elastic paddle; 2. Stationary ring assembly; 21. Stationary ring seat; 22. Stationary ring; 3. Rotating shaft; 31. Shell; 4. Ring; 41. Fan blade; 42. Bending end; 43. Inclined surface; 44. Knock-off surface; 45. Bristles; 46. Anti-friction gap; 47. Mounting groove; 48. Embedded groove; 49. Card slot; 5. Return block; 6. Connecting block; 61. Step. DETAILED DESCRIPTION

[0039] The following is combined with Figures 1-6A further detailed description of the present application will be given.

[0040] An embodiment of the present application discloses a mechanical seal, which is used to be installed on a rotating shaft 3.

[0041] Refer to Figure 1 , the mechanical seal includes a dynamic ring assembly 1 and a static ring assembly 2, and the dynamic ring assembly 1 and the static ring assembly 2 are arranged opposite to each other.

[0042] The dynamic ring assembly 1 includes a dynamic ring seat 11, a spring 12 and a dynamic ring 13. The dynamic ring seat 11 is fixedly sleeved on the rotating shaft 3, and the dynamic ring 13 is embedded in the dynamic ring seat 11; the spring 12 is installed on the dynamic ring seat 11, so that the dynamic ring 13 always has a tendency to move towards the static ring assembly 2.

[0043] The static ring assembly 2 includes a static ring seat 21 and a static ring 22. The static ring seat 21 is rotatably sleeved on the rotating shaft 3, and the static ring 22 is embedded in the static ring seat 21 and abuts against the dynamic ring 13. In addition, the rotating shaft 3 is connected to a housing 31, and the static ring 22 and the housing 31 are connected by a thread, so that the static ring 22 is stationary on the rotating shaft 3 through the housing 31.

[0044] See Figure 2 And Figure 3 , the mechanical seal further includes a collar 4, the collar 4 is sleeved on the dynamic ring 13 and rotates together with the dynamic ring 13, and a plurality of fan blades 41 are fixedly connected to the outer circumferential surface of the collar 4. Among them, the number of the fan blades 41 can be three or four, and the number of the fan blades 41 is set according to the actual situation. In this embodiment, three fan blades 41 are provided, and the three fan blades 41 are arranged at intervals along the outer circumferential surface of the collar 4.

[0045] When the mechanical seal is in use, the dynamic ring 13 rotates with the rotating shaft 3, and at the same time, the dynamic ring 13 drives the collar 4 to rotate together, and the collar 4 drives the three fan blades 41 to rotate; when the water pump is started, the rotating shaft 3 drives the dynamic ring 13 to rotate, the dynamic ring 13 drives the collar 4 to rotate, and the fan blades 41 on the collar 4 stir the water flow, stirring up the impurities deposited between the dynamic ring 13 and the static ring 22, and the fan blades 41 are similar to fan blades, discharging the stirred impurities, so as to wash away the impurities falling between the dynamic ring 13 and the static ring 22.

[0046] Among them, the fan blades 41 are inclined on the collar 4, and the fan blades 41 stir the water flow to wash away the impurities at the static ring 22.

[0047] See Figure 3 And Figure 4, one end of the fan blade 41 away from the collar 4 is a bent end 42. The end face of the bent end 42 away from the collar 4 has an inclined surface 43. The inclined surface 43 gradually inclines from the side close to the stationary ring 22 to the side away from the stationary ring 22 towards the outer ring surface of the collar 4. When the collar 4 rotates, the inclined surfaces 43 of the three fan blades 41 rotate to form a knocking-off surface 44. When impurities fall, the impurities will be knocked off by the knocking-off surface 44 in the direction away from the stationary ring 22, making it difficult for the impurities to fall between the moving ring 13 and the stationary ring 22.

[0048] In addition, the bent end 42 bends towards the outer ring surface of the collar 4, making the bent end 42 arc-shaped, and the bending direction is opposite to the rotation direction of the moving ring 13. When the collar 4 rotates,

[0049] The fan blade 41 is provided with bristles 45 at the bent end 42. The bristles 45 are located on the end face of the bent end 42 close to the stationary ring 22. And when the collar 4 is installed on the moving ring 13, the end of the bristles 45 abuts against the stationary ring seat 21. When the collar 4 rotates, the bristles 45 continuously brush the stationary ring seat 21 to brush off the impurities on the stationary ring seat 21. And the bristles 45 are located above the abutting position of the moving ring 13 and the stationary ring 22. By blocking part of the impurities with the bristles 45, it is difficult for the impurities to fall between the moving ring 13 and the stationary ring 22.

[0050] When designing the mechanical seal, the material of the moving ring 13 is softer than that of the stationary ring 22. When the moving ring 13 and the stationary ring 22 rub against each other, the moving ring 13 is worn first. After that, if the moving ring 13 cannot abut against the stationary ring 22, only the moving ring 13 needs to be replaced; since the collar 4 is connected to the moving ring 13, when the moving ring 13 is worn to a certain extent, the collar 4 will abut against the stationary ring 22 and rub against each other.

[0051] See Figure 2 And Figure 3 , to prevent the collar 4 from rubbing against the stationary ring 22, there is an anti-friction gap 46 between the collar 4 and the stationary ring 22, so that the end of the bristles 45 abuts against the stationary ring seat 21; and, a retracting block 5 is rotatably sleeved on the moving ring 13. One end face of the retracting block 5 abuts against the stationary ring 22, and the other end face abuts against the collar 4. When the moving ring 13 is worn, the retracting block 5 pushes the collar 4 to move on the moving ring 13, so that the collar 4 and the stationary ring 22 always maintain the anti-friction gap 46. In this embodiment, three retracting blocks 5 are provided, and the three retracting blocks 5 are arranged at the same interval along the circumferential direction of the collar 4.

[0052] See Figure 5 , the collar 4 is provided with an installation groove 47. One end of the retracting block 5 away from the stationary ring 22 is rotatably inserted into the installation groove 47 to make the position between the retracting block 5 and the collar 4 stable; wherein, the distance between the installation groove 47 and the inner ring surface of the collar 4 is greater than the diameter of the moving ring 13, so that after the retracting block 5 is inserted into the installation groove 47, the inner ring wall of the retracting block 5 does not abut against the moving ring 13.

[0053] Since both sides of the retraction block 5 are respectively abutted against the collar 4 and the stationary ring 22, the retraction block 5 will rotate together with the collar 4. To reduce the wear of the stationary ring 22, the material of the retraction block 5 is softer than that of the stationary ring 22, but the material of the retraction block 5 is harder than that of the moving ring 13. When the mechanical seal is in use, the wear rate of the moving ring 13 is faster than that of the retraction block 5, so that after the moving ring 13 is worn, the retraction block 5 pushes the collar 4 to move on the moving ring 13; moreover, the retraction block 5 is located above the moving ring 13 and the stationary ring 21, and by blocking part of the impurities with the retraction block 5, the impurities are not easily deposited on the moving ring 13 and the stationary ring 21, thereby reducing the wear of the moving ring 13 and the stationary ring 21.

[0054] See Figure 2 And Figure 6 , a plurality of sliding grooves 14 are formed in the outer circumferential wall of the moving ring 13, and a connecting block 6 is installed in each sliding groove 14. The thickness of the connecting block 6 is greater than the thickness of the sliding groove 14, so that part of the connecting block 6 protrudes from the sliding groove 14. The sliding groove 14 can be one, two, or three. In this embodiment, three sliding grooves 14 are provided, and the three sliding grooves 14 are circumferentially spaced at the same distance on the moving ring 13.

[0055] Three fitting grooves 48 are formed in the inner circumferential wall of the collar 4, and the three fitting grooves 48 correspond to the three connecting blocks 6 one by one. When the collar 4 is connected to the moving ring 13, the connecting block 6 is embedded in the fitting groove 48, making it easier for the collar 4 to rotate together with the moving ring 13.

[0056] In addition, the width of the sliding groove 14 in the axial direction of the moving ring 13 is greater than the width of the connecting block 6, so that the connecting block 6 can slide axially on the moving ring 13 in the sliding groove 14, so that the collar 4 can move axially on the moving ring 13 along the axial direction of the moving ring 13.

[0057] To facilitate the embedding of the connecting block 6 into the fitting groove 48, the fitting groove 48 communicates with the end face of the collar 4 close to the stationary ring 22. When the collar 4 is installed, first install the collar 4 on the moving ring 13 and squeeze the collar 4 until the collar 4 abuts against the moving ring seat 11, then install the connecting block 6 into the fitting groove 48, rotate the collar 4 to make the fitting groove 48 correspond to the connecting block 6, and finally move the collar 4 in the direction close to the stationary ring 22 until the connecting block 6 enters the fitting groove 48.

[0058] To make it easier for the retraction block 5 to push the collar 4 to move on the moving ring 13, the three fitting grooves 48 correspond to and communicate with the three installation grooves 47 one by one, so that after the retraction block 5 is embedded in the installation groove 47, part of the retraction block 5 abuts against the collar 4, and part of the retraction block 5 abuts against the connecting block 6. When the retraction block 5 moves axially along the moving ring 13, the retraction block 5 pushes the connecting block 6 and the collar 4, and the connecting block 6 moves in the sliding groove 14, and the collar 4 slides on the moving ring 13.

[0059] To prevent the return block 5 from easily coming into contact with the moving ring 13, a step 61 is provided on the connecting block 6, and the return block 5 abuts against the step surface 61 of the step 61. The return block 5 is limited by the step 61, making the connection between the return block 5 and the collar 4 more stable.

[0060] In addition, a number of elastic tabs 15 are provided on the moving ring seat 11. In this embodiment, the number of elastic tabs 15 is also three. The three elastic tabs 15 are arranged at the same interval along the circumferential direction of the moving ring seat 11, and the three elastic tabs 15 correspond to the three sliding grooves 14 one by one.

[0061] The collar 4 is provided with a number of card slots 49, and the number of card slots 49 is the same as and corresponds to the number of the embedding grooves 48 one by one. After the collar 4 is installed on the moving ring 13, the ends of the three elastic tabs 15 are respectively embedded into the three card slots 49. Through the action of the elastic tabs 15, the collar 4 always has a tendency to move closer to the stationary ring 22.

[0062] The implementation principle of a mechanical seal in an embodiment of the present application is as follows: When the mechanical seal is in use, the collar 4 rotates together with the moving ring 13, and the collar 4 drives the fan blade 41 to rotate together. When the moving ring 13 is worn, the return block 5 pushes the collar 4 to move on the moving ring 13, maintaining an anti-friction gap 46 between the collar 4 and the stationary ring 22.

[0063] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A mechanical seal, characterized in that: It includes a moving ring assembly (1) having a moving ring (13), a stationary ring assembly (2) having a stationary ring (21), and a collar (4). The collar (4) is sleeved on the moving ring (13) and rotates together with the moving ring (13). A plurality of fan blades (41) are provided on the outer circumferential surface of the collar (4). There is an anti-friction gap (46) between the collar (4) and the stationary ring (21). On the side of the fan blade (41) close to the stationary ring (21), there are bristles (45) for cleaning the stationary ring assembly (2). A retracting block (5) is rotatably sleeved on the moving ring (13). One side surface of the retracting block (5) abuts against the stationary ring (21), and the other end surface abuts against the collar (4).

2. A mechanical seal according to claim 1, characterized in that: The fan blades (41) are inclinedly arranged on the collar (4). The end of the fan blade (41) away from the collar (4) is a bent end (42). The bent end (42) bends towards the outer circumferential surface of the collar (4), and the bending direction of the bent end (42) is opposite to the rotation direction of the moving ring (13).

3. A mechanical seal according to claim 2, characterized in that: The end surface of the bent end (42) away from the collar (4) has an inclined surface (43), and the inclined surface (43) is arranged away from the stationary ring (21).

4. A mechanical seal according to claim 2, characterized in that: The bristles (45) are arranged on the bent end (42).

5. A mechanical seal according to claim 1, characterized in that: The collar (4) is provided with an installation groove (47) for the retracting block (5) to be inserted into. The end of the retracting block (5) away from the stationary ring (21) is rotatably inserted into the installation groove (47). The distance from the installation groove (47) to the inner circumferential surface of the collar (4) is greater than the diameter of the moving ring (13).

6. The mechanical seal according to claim 5, characterized in that: The moving ring (13) is provided with a plurality of connecting blocks (6). The collar (4) is provided with a plurality of embedding grooves (48) for the plurality of connecting blocks (6) to be embedded into. The plurality of embedding grooves (48) correspond to the plurality of connecting blocks (6) one by one.

7. A mechanical seal according to claim 6, characterized in that: The moving ring (13) is provided with a sliding groove (14) for the connecting block (6) to be embedded into. The connecting block (6) slides axially along the moving ring (13) in the sliding groove (14).

8. A mechanical seal according to claim 7, characterized in that: The installation groove (47) is communicated with the sliding groove (14), and the retracting block (5) abuts against the connecting block (6).

9. A mechanical seal according to claim 6, characterized in that: The moving ring assembly (1) is provided with a plurality of elastic paddles (15) that always push the collar (4) towards the stationary ring (21). The plurality of elastic paddles (15) correspond to the plurality of connecting blocks (6) one by one. The stationary ring (21) is provided with a plurality of card slots (49) for the ends of the plurality of elastic paddles (15) to be embedded into. The plurality of card slots (49) correspond to the plurality of embedding grooves (48) one by one.

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