A dry-running mechanical seal

Abstract

This invention discloses an anti-dry-friction mechanical seal, comprising a main shaft and a housing sleeved outside the main shaft, wherein an oil chamber is provided inside the housing; the oil chamber contains a first stationary ring and a second stationary ring, and a sealing assembly sleeved outside the main shaft is provided between the first stationary ring and the second stationary ring; the sealing assembly includes a first rotating ring, a second rotating ring, and a driving member, and the first rotating ring and the second rotating ring are linked to the main shaft; the driving member causes the first rotating ring and the second rotating ring to move in opposite directions, simultaneously causing the first rotating ring to abut against the first stationary ring and the second rotating ring to abut against the second stationary ring. Because there is a driving member between the two rotating rings, and the driving member synchronously causes the rotating ring to fit tightly against the corresponding stationary ring, the driving member can automatically compensate for the gap caused by wear between the rotating ring and the stationary ring, thereby ensuring reliable sealing while extending the service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of sealing technology, specifically to an anti-dry-friction mechanical seal. Background Technology

[0002] Currently, mechanical seals are very prone to damage if dry friction occurs during use. A search revealed that although the existing technology with publication number CN106122077A can solve the above problem, it can only achieve single-sided sealing in the axial direction of the spindle, resulting in insufficient sealing performance. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-dry-friction mechanical seal to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an anti-dry friction mechanical seal, comprising a main shaft and a housing sleeved outside the main shaft, wherein an oil chamber is provided inside the housing; a first stationary ring and a second stationary ring are provided inside the oil chamber, and a sealing assembly sleeved outside the main shaft is provided between the first stationary ring and the second stationary ring; the sealing assembly includes a first rotating ring, a second rotating ring and a driving member, wherein the first rotating ring and the second rotating ring are linked with the main shaft; the driving member causes the first rotating ring and the second rotating ring to move in opposite directions, and simultaneously causes the first rotating ring to abut against the first stationary ring and the second rotating ring to abut against the second stationary ring.

[0005] As a preferred technical solution of the present invention: the second moving ring includes a contact element, and the contact element is provided with a first sealing ring inside, and the sealing between the contact element and the main shaft is achieved through the first sealing ring.

[0006] As a preferred embodiment of the present invention, the side of the contact member away from the driving member contacts the second stationary ring through a protrusion.

[0007] As a preferred embodiment of the present invention, the second moving ring further includes a baffle plate, which isolates the direct contact between the driving member and the contact member.

[0008] As a preferred embodiment of the present invention, the baffle is in close contact with one side of the contact member under the action of the driving member.

[0009] As a preferred embodiment of the present invention, the driving component is a helical spring.

[0010] As a preferred technical solution of the present invention: a bearing isolator is also provided inside the housing, and the bearing isolator is sleeved outside the main shaft, and the bearing isolator prevents the grease in the oil tank from flowing outward through the bearing isolator.

[0011] As a preferred technical solution of the present invention: the shell is further provided with a partition, and the partition separates a water tank for installing the bearing isolator in the oil tank.

[0012] As a preferred embodiment of the present invention: the bearing isolator is installed after the water tank, and a sewage discharge chamber is formed between the bearing isolator and the partition.

[0013] As a preferred technical solution of the present invention: the sewage discharge chamber is connected to the outside through a sewage discharge port.

[0014] The beneficial effects of the present invention by adopting the above technical solution are as follows: 1. Since there are two rotating rings and two stationary rings inside the oil tank, and each rotating ring is tightly attached to the corresponding stationary ring under the action of the driving component; thus, the mechanical seal achieves sealing by the mutual friction between the rotating ring and the stationary ring through rotation, and avoids dry friction between the rotating ring and the stationary ring under the cooperation of the oil in the oil tank; secondly, since there are rotating rings and stationary rings on both sides of the main shaft, the sealing can be completed simultaneously on both sides of the main shaft, thereby improving the sealing effect of the mechanical seal.

[0015] 2. Because there is a driving component between the two rotating rings, and the driving component is used to synchronously make the rotating ring and the corresponding stationary ring fit tightly, the driving component can automatically compensate for the gap between the rotating ring and the stationary ring caused by wear, thereby ensuring reliable sealing and extending the service life of the equipment. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the main structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the housing after it has been installed with the spindle, showing the housing cut open.

[0018] Figure 3 This is an exploded structural diagram of the sealing assembly of the present invention;

[0019] Figure 4 This is a schematic diagram of the main structure of the contact element of the present invention.

[0020] In the figure: 1. Main shaft; 2. Housing; 3. Sealing assembly; 30. Drive component; 31. First moving ring; 32. Second moving ring; 33. Baffle; 34. First sealing ring; 35. Contact component; 36. Protrusion; 4. Drain outlet; 5. Bearing isolator; 6. First stationary ring; 7. Second stationary ring; 8. Oil tank; 9. Baffle plate; 10. Water tank; 11. Drain chamber. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0022] Please see Figure 1-4 An embodiment of the present invention provides an anti-dry friction mechanical seal, comprising a main shaft 1 and a housing 2 sleeved outside the main shaft 1, wherein an oil tank 8 is provided inside the housing 2; a first stationary ring 6 and a second stationary ring 7 are provided inside the oil tank 8, and a sealing assembly 3 sleeved outside the main shaft 1 is provided between the first stationary ring 6 and the second stationary ring 7; the sealing assembly 3 includes a first moving ring 31, a second moving ring 32 and a driving member 30, wherein the first moving ring 31 and the second moving ring 32 are linked with the main shaft 1; the driving member 30 causes the first moving ring 31 and the second moving ring 32 to move in opposite directions, and simultaneously causes the first moving ring 31 to abut against the first stationary ring 6 and the second moving ring 32 to abut against the second stationary ring 7.

[0023] In summary, since two rotating rings and two stationary rings are provided inside the oil tank 8, and each rotating ring is tightly attached to the corresponding stationary ring under the action of the drive component 30, the mechanical seal achieves two advantages: firstly, the rotating ring can rotate outside the stationary ring, and the mutual friction between the two achieves the sealing effect; at the same time, with the cooperation of the oil, dry friction between the rotating ring and the stationary ring can be avoided; secondly, since both sides of the main shaft 1 have rotating rings and stationary rings, the sealing can be completed simultaneously on both sides of the main shaft 1, thereby improving the sealing effect of the mechanical seal.

[0024] In particular, since there is a drive element 30 between the two rotating rings, and the drive element 30 is used to synchronously make the rotating ring and the corresponding stationary ring fit tightly, the drive element 30 can automatically compensate for the gap between the rotating ring and the stationary ring caused by wear, thereby ensuring reliable sealing and extending the service life of the equipment.

[0025] Furthermore, since the second moving ring 32 includes a contact element 35, and the contact element 35 is provided with a first sealing ring 34 inside, and the sealing between the contact element 35 and the main shaft 1 is achieved through the first sealing ring 34, firstly, the contact element 35 is used to contact the corresponding stationary ring to facilitate the replacement of the contact element 35; secondly, the contact element 35 can also be used to cause the first sealing ring 34 to deform in order to achieve the sealing between the contact element 35 and the main shaft 1.

[0026] Based on this, the device utilizes the mutual friction between the rotating ring and the stationary ring to achieve external sealing, while the first sealing ring can also achieve internal sealing under the action of the contact element 35, thus effectively improving the mechanical sealing performance.

[0027] Furthermore, the side of the contact member 35 away from the drive member 30 contacts the second stationary ring 7 through the provided protrusion 36, thereby increasing the length of the wear-prone portion of the contact member 35 to extend the service life of the contact member 35. At the same time, the provision of the protrusion 36 can also reduce the contact area between the rotating ring and the stationary ring, thereby reducing the resistance when the rotating ring rotates.

[0028] To reduce wear on the rotating ring by the drive member 30 during rotation, the second rotating ring 32 also includes a baffle 33, which isolates the drive member 30 from direct contact with the contact member 35. Specifically, the baffle 33 is in close contact with one side of the contact member 35 under the action of the drive member 30.

[0029] Based on this, when asynchronous movement occurs between the drive component 30 and the rotating ring, the problem of excessive wear of the rotating ring by the drive component 30 can be effectively avoided. Simultaneously, by utilizing the planar contact between the baffle and the rotating ring, the baffle not only reduces the resistance during rotation of the rotating ring but also prevents the drive component 30 from interfering with the linkage of the rotating ring following the main shaft 1. The drive component 30 is a helical spring.

[0030] Based on the above scheme, a bearing isolator 5 is also provided inside the housing 2, and the bearing isolator 5 is sleeved outside the main shaft 1. The bearing isolator 5 prevents the grease in the oil tank 8 from flowing outward through the bearing isolator 5. The bearing isolator 5 is model XM30 and has a specification of 30*50*12. Thus, the labyrinth structure inside the bearing isolator prevents some of the oil-water mixture from flowing out of the oil tank 8 and causing adverse effects on the internal components. Specifically, after the oil-water mixture enters the interior of the labyrinth bearing isolator 5, the labyrinth structure can reduce the flow velocity and kinetic energy of the oil mixture, thereby reducing oil leakage.

[0031] In particular, the sealing structure formed between the first moving ring 31 and the first stationary ring 6, the sealing structure formed between the second moving ring 32 and the second stationary ring 7, and the sealing structure formed by the bearing isolator 5, so that the mechanical seal has at least three sealing structures on the main shaft 1, which can greatly improve the sealing effect and sealing capacity of the mechanical seal.

[0032] Specifically, the housing 2 is also provided with a partition 9, and the partition 9 separates the oil tank 8 into a water tank 10 for installing the bearing isolator 5. This separates the oil tank 8 and the water tank 10 inside the housing 2 from each other, and also prevents the expansion between oil and water. From the structure of the housing 2, the relative isolation of oil and water can also be achieved.

[0033] Furthermore, since the bearing isolator 5 is installed after the water tank 10, a drain chamber 11 is formed between the bearing isolator 5 and the partition 9; therefore, the drain chamber 11 can further slow down the mixing speed of oil and water, so as to extend the shelf life of the oil, and at the same time, it can also accumulate more serious oil-water mixtures.

[0034] In addition, after prolonged use, oil and water mixtures are inevitable. Therefore, the drain chamber 11 is connected to the outside through the drain port 4 so as to quickly drain the oil and water mixture and replace it with new oil.

[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A mechanical seal resistant to dry friction, characterized in that: It includes a main shaft (1) and a housing (2) fitted outside the main shaft (1), and the housing (2) is provided with an oil tank (8); The oil tank (8) is provided with a first stationary ring (6) and a second stationary ring (7), and a sealing assembly (3) is provided between the first stationary ring (6) and the second stationary ring (7) and sleeved on the main shaft (1); The sealing assembly (3) includes a first rotating ring (31), a second rotating ring (32), and a driving member (30), and the first rotating ring (31) and the second rotating ring (32) are linked with the main shaft (1); The drive member (30) causes the first moving ring (31) and the second moving ring (32) to move in opposite directions, and at the same time causes the first moving ring (31) to collide with the first stationary ring (6) and the second moving ring (32) to collide with the second stationary ring (7).

2. The anti-dry-friction mechanical seal according to claim 1, characterized in that: The second moving ring (32) includes a contact element (35), and the contact element (35) is provided with a first sealing ring (34) inside, and the sealing between the contact element (35) and the main shaft (1) is achieved through the first sealing ring (34).

3. The anti-dry-friction mechanical seal according to claim 2, characterized in that: The side of the contact member (35) away from the drive member (30) contacts the second stationary ring (7) through a protrusion (36).

4. The anti-dry-friction mechanical seal according to claim 3, characterized in that: The second moving ring (32) also includes a baffle (33), which isolates the direct contact between the drive member (30) and the contact member (35).

5. The anti-dry-friction mechanical seal according to claim 4, characterized in that: The baffle (33) is pressed against one side of the contact (35) under the action of the driving member (30).

6. The anti-dry-friction mechanical seal according to claim 5, characterized in that: The driving component (30) is a helical spring.

7. A dry-friction resistant mechanical seal according to any one of claims 1-6, characterized in that: The housing (2) is also provided with a bearing isolator (5), and the bearing isolator (5) is sleeved on the outside of the main shaft (1), and the bearing isolator (5) prevents the grease in the oil tank (8) from flowing outward through the bearing isolator (5).

8. The anti-dry-friction mechanical seal according to claim 7, characterized in that: The shell (2) is also provided with a partition (9), and a water tank (10) for installing the bearing isolator (5) is separated in the oil tank (8) by the partition (9).

9. The anti-dry-friction mechanical seal according to claim 8, characterized in that: The bearing isolator (5) is installed after the water tank (9), and a sewage discharge chamber (11) is formed between the bearing isolator (5) and the partition (9).

10. The anti-dry-friction mechanical seal according to claim 9, characterized in that: The sewage discharge chamber (11) is connected to the outside world through a sewage discharge port (4).

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