Structural device for improving efficiency of mechanical seal pumping ring

Abstract

The utility model discloses a structure device for improving the efficiency of a mechanical seal pumping ring. The flow channel is reasonably arranged, the baffle is arranged in the flow channel to change the liquid flowing direction, and the flushing outlet is arranged to be a tangential outlet to reduce liquid flowing damping, so that hot liquid pumped out through the pumping ring can flow along the flow channel along with rotation of the pumping ring, and the flowing direction can be automatically changed to flow to the flushing outlet; the liquid can be conveyed into the cooling system more smoothly so as to guarantee the liquid circulation amount, the working efficiency of the pumping ring is improved, generated friction heat and hot liquid are discharged timely and efficiently, and the liquid flows back and circulates after being cooled by the cooling system.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a structural device for improving the efficiency of a mechanical seal pumping ring. Background Art

[0002] A mechanical seal consists of a pair of annular parts that fit together and slide relative to each other. The rotating part during operation is called the dynamic ring, and the non-rotating part is called the static ring. The two end faces of the dynamic ring and the static ring are pressed tightly together and the contact surface is called the sealing end face. In this tightly fitting state, an extremely thin fluid film is maintained between the sealing end faces. This film balances pressure and lubricates the sealing end faces, and is also a key factor in achieving sealing. Because of the presence of this film, friction and wear can be effectively reduced while maintaining the sealing effect. If a stable fluid film cannot be formed on the sealing end face, dry friction will damage the sealing end face, causing large amounts of leakage and failure of the mechanical seal.

[0003] Mechanical seals are installed on equipment to achieve sealing. Equipment consists of a shaft, a sealing chamber, and other components. The mechanical seal is mounted on the shaft, with a gland attached to the outside. A portion of the gland is connected to the sealing chamber. The space enclosed by the sealing chamber, gland, and shaft—the space in which the mechanical seal is installed—is called the seal working chamber, which is initially empty. The mechanical seal consists of a sleeve, a transmission ring, a spring case assembly, a rotating ring, and a stationary ring. During operation, the sleeve, spring case assembly, and rotating ring rotate with the shaft. The stationary ring, mounted on the gland, remains stationary relative to the gland and the sealing chamber. The rotating rotating ring rubs against the surface of the stationary ring, generating frictional heat. This heat causes the seal face to overheat. This high heat causes the fluid film lubricating the seal face to vaporize due to overheating, preventing the seal face from forming a stable fluid film. Consequently, the hot fluid fills the seal working chamber. A pumping ring, mounted on the outside of the rotating ring (spring case assembly), rotates with the sleeve to pump the fluid generated within the sealing chamber out of the chamber.

[0004] The purpose of a pumping ring in a mechanical seal is to pump the liquid out of the dynamic and static rings, cool it down in the cooling system, and then return it to the seal working chamber. This ensures that the operating temperature of the dynamic and static rings remains within a certain reasonable range and that the lubricating film on the seal end face does not vaporize.

[0005] Although the existing technical solution is provided with a pumping ring, due to the design defects of the pumping ring itself and the flow resistance of the pumped liquid, the working efficiency of the pumping ring is not high and the friction heat of the dynamic and static sealing rings cannot be effectively discharged in time. Utility Model Content

[0006] The technical problem to be solved by the present invention is that the pumping ring of the prior art has design defects itself, and there is flow resistance when pumping liquid, which makes the working efficiency of the pumping ring low and cannot effectively and timely discharge the friction heat of the dynamic and static sealing rings. A structural device is provided to improve the efficiency of the mechanical seal pumping ring.

[0007] The utility model solves the above technical problems through the following technical solutions:

[0008] The utility model provides a structural device for improving the efficiency of a mechanical seal pumping ring. The structural device comprises: a mechanical seal, which is installed on the equipment shaft.

[0009] The mechanical seal includes a sleeve, which is arranged on the equipment shaft, a transmission ring is provided at the end of the sleeve, the gland is connected to the sealing cavity by bolts, a static ring is installed in the gland, a dynamic ring is installed on the sleeve, and a flow channel is provided on the gland;

[0010] The outer circle of the dynamic ring is provided with a pumping ring, and the pumping ring is provided with a small hole, and the small hole corresponds to the flow channel;

[0011] The gland is provided with a flushing outlet and a flushing inlet, and the flushing inlet is fixed on the gland.

[0012] Preferably, the flow channel is connected to the flushing outlet, and the width of the flow channel is greater than the width of the small hole.

[0013] Preferably, the flow channel is provided with a baffle at a position close to the flushing outlet, and the flushing outlet is configured as a tangential outlet.

[0014] Preferably, the mechanical seal further comprises a spring box assembly, one end of the dynamic ring is mounted in the spring box assembly, and the other end is in contact with the static ring.

[0015] Preferably, the flushing outlet and the flushing inlet are respectively connected to the cooling system through pipelines.

[0016] The positive progress of the present invention is that it provides a structural device for improving the efficiency of the mechanical seal pumping ring. By rationally setting the flow channel and arranging a baffle in the flow channel to change the liquid flow direction and setting the flushing outlet as a tangential outlet to reduce the liquid flow damping, the hot liquid pumped out by the pumping ring can flow along the flow channel along the rotation of the pumping ring and can automatically change the flow direction to flow to the flushing outlet, so that the liquid can be more smoothly transported to the cooling system to ensure the liquid circulation volume, improve the working efficiency of the pumping ring, and promptly and efficiently discharge the generated friction heat and hot liquid. After cooling through the cooling system, the liquid refluxes and circulates back and forth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a detailed structural diagram of a structural device for improving the efficiency of a mechanical seal pumping ring according to an embodiment of the utility model.

[0018] Figure 2 This is a schematic structural diagram of a gland according to an embodiment of the present invention.

[0019] Legend: 1. Equipment shaft; 2. Bushing; 3. Transmission ring; 4. Sealing working chamber; 5. Dynamic ring; 6. Static ring; 7. Gland; 8. Flow channel; 9. Pumping ring; 10. Small hole; 11. Flushing outlet; 12. Flushing inlet; 13. Baffle; 14. Spring box assembly; 15. Mechanical seal; 16. Sealing chamber. DETAILED DESCRIPTION

[0020] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0021] Example 1

[0022] like Figure 1 As shown, this embodiment provides a structural device for improving the efficiency of a mechanical seal pumping ring. The structural device includes: an equipment shaft 1, a sleeve 2, a transmission ring 3, a sealed working chamber 4, a dynamic ring 5, a static ring 6, a gland 7, a flow channel 8, a pumping ring 9, a small hole 10, a flushing outlet 11, a flushing inlet 12, and a mechanical seal 15. The mechanical seal 15 is mounted on the equipment shaft 1. The sleeve 2 in the mechanical seal 15 is disposed on the equipment shaft 1, and the end of the sleeve 2 is provided with a transmission ring 3. The gland 7 is connected to the sealing chamber 16 by bolts. The static ring 5 is mounted in the gland 7, the dynamic ring 5 is mounted on the sleeve 2, and the gland 7 is provided with a flow channel 8. The outer circumference of the dynamic ring 5 is provided with a pumping ring 9, and the pumping ring 9 is provided with a small hole 10, which corresponds to the flow channel 8. The gland 7 is provided with a flushing outlet 11 and a flushing inlet 12, and the flushing inlet 12 is fixed to the gland 7. In this embodiment, the sealing cavity 16 is a component of the equipment. The space surrounded by the pressure cover 7, the sealing cavity 16 and the equipment shaft 1 is called the sealing working cavity 4, that is, the space where the mechanical seal 15 is installed, which is initially in a cavity state; the mechanical seal 15 includes a sleeve 2, a transmission ring 3, a dynamic ring 5, a static ring 6 and a pumping ring 9. When starting work, the sleeve 2 and the dynamic ring 5 rotate with the equipment shaft 1, and the static ring 6, the pressure cover 7 and the sealing cavity 16 remain stationary. The rotation of the dynamic ring 5 will rub against the surface of the static ring 6 to generate friction heat. The liquid film on the sealing end surface where the dynamic ring 5 and the static ring 6 are in contact will vaporize at high temperature to generate liquid stored in the sealing working cavity 4; the pumping ring 9 can pump the hot liquid generated in the sealing working cavity 4 out of the sealing working cavity 4.

[0023] In this embodiment, the flushing outlet 11 and the flushing inlet 12 are respectively connected to the cooling system through pipes. Specifically, when the equipment shaft 1 rotates, the shaft sleeve 2 is driven to rotate under the action of the transmission ring 3, and the rotation of the shaft sleeve 2 drives the dynamic ring 5 and the pumping ring 9 to rotate accordingly. When the shaft sleeve 2 rotates, the dynamic ring 5 and the static ring 6 will rub against each other to generate friction heat, which generates a large amount of heat and is transferred to the sealed working chamber 4, causing the liquid film on the sealing end faces of the dynamic ring 5 and the static ring 6 to vaporize and generate hot liquid stored in the sealed working chamber 4; the pumping ring 9 rotates to pump the hot liquid through the flushing outlet 11 to the cooling system. After the hot liquid is cooled by the cooling system, it is returned to the sealed working chamber 4 through the flushing inlet 12. The pumped liquid circulation keeps the working temperature of the dynamic ring 5 and the static ring 6 within a certain reasonable range, so that the liquid film on the sealing end faces does not vaporize.

[0024] In this embodiment, the mechanical seal 15 also includes a spring-casing assembly 14. One end of the dynamic ring 5 is mounted within this assembly, while the other end engages the stationary ring 6. Specifically, the spring-casing assembly 14 is mounted on the outer circumference of the sleeve 2. The spring includes a spring that contacts one end of the dynamic ring 5, providing an initial preload for the two rings, ensuring a tight fit during operation. Furthermore, since the dynamic ring 5 is freely movable axially, wear may occur during this movement. The spring compensates for wear on the sealing end, maintaining a tight fit between the dynamic ring 5 and the stationary ring 6.

[0025] In this embodiment, the flow channel 8 is connected to the flushing outlet 11; the width of the flow channel 8 is greater than the width of the small holes 10. Specifically, the pumping ring 9 is provided with a plurality of small holes 10, which are distributed on the outer circumference of the pumping ring 9 and correspond to the flow channel 8 on the gland 7. The width of the flow channel 8 is approximately 2-4 mm greater than the width of the small holes 10. The depth of the flow channel 8 is determined by the diameter of the equipment shaft 1. When the diameter is less than or equal to 50 mm, the depth of the flow channel 8 is not less than 4 mm; when the diameter is greater than 50 mm, the depth of the flow channel 8 is 4-6 mm. The specific value is set according to actual conditions. In this embodiment, the rotation of the pumping ring 9 causes the hot liquid in the sealed working chamber 4 to be pumped through the small holes 10 into the flow channel 8. The liquid flows along the flow channel 8 toward the flushing outlet 11 in the direction of the pumping ring 9's rotation. Then, it flows along the pipeline into the cooling system, cools, and then flows back to the sealed working chamber 4 through the flushing inlet 12 to reduce the temperature in the sealed working chamber 4.

[0026] like Figure 2As shown, in this embodiment, a baffle 13 is provided in the flow channel 8 near the flush outlet 11, and the flush outlet 11 is configured as a tangential outlet. Specifically, the rotation of the pumping ring 9 drives the vaporized hot liquid to rotate along the flow channel 8. By providing the baffle 13 in front of the flush outlet 11, the hot liquid is prevented from changing its flow direction and flowing toward the flush outlet 11. At the same time, the flush outlet 11 is configured as a tangential outlet, which reduces the damping of the hot liquid flow, ensuring that the hot liquid is pumped smoothly and efficiently into the cooling system.

[0027] This embodiment provides a structural device for improving the efficiency of a mechanical seal pumping ring. This structural device reduces liquid flow damping by rationally arranging a flow channel, installing a baffle in the flow channel to change the direction of liquid flow, and setting a flushing outlet as a tangential outlet. This allows hot liquid pumped out by the pumping ring to flow along the flow channel as the pumping ring rotates, and automatically changes its flow direction to flow toward the flushing outlet. This allows the liquid to be more smoothly delivered to the cooling system to ensure liquid circulation, improve the working efficiency of the pumping ring, and promptly and efficiently discharge the generated friction heat and hot liquid. After cooling through the cooling system, the liquid circulates back and forth.

[0028] The working principle of the present invention is as follows: the equipment shaft 1 rotates, and the drive ring 3 drives the shaft sleeve 2 to rotate. The rotation of the shaft sleeve 2 drives the internal dynamic ring 5 and pumping ring 9 to rotate accordingly. When the shaft sleeve 2 rotates, the dynamic ring 5 and the static ring 6 rub against each other to generate frictional heat. The generated heat causes the liquid film on the sealing end surfaces of the dynamic ring 5 and the static ring 6 to vaporize and generate hot liquid. The pumping ring 9 rotates, and the hot liquid can be pumped along the flow channel 8 along the direction of rotation of the pumping ring 9 to the flushing outlet 11, and then transported to the cooling system through the pipeline. A baffle 13 is provided in the flow channel 8 near the front of the flushing outlet 11. The baffle 13 can change the flow direction of the hot liquid in the flow channel 8 and flow out through the flushing outlet 11. The provision of a tangential outlet at the flushing outlet 11 can easily reduce the damping of the hot liquid flow. The hot liquid is cooled by the cooling system and then returned to the sealed working chamber 4 through the flushing inlet 12. The pumped liquid circulation keeps the operating temperature of the dynamic ring 5 and the static ring 6 within a certain reasonable range, so that the liquid film on the sealing end surface does not vaporize. By setting the flow channel 8 and the baffle 13 in the flow channel to change the liquid flow direction and setting the flushing outlet as a tangential outlet to reduce the liquid flow damping, the liquid can be transported to the cooling system more smoothly to ensure the liquid circulation volume, improve the working efficiency of the pumping ring, and discharge the generated friction heat and vaporized liquid in time.

[0029] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A structural device for improving the efficiency of a mechanical seal pumping ring, characterized in that: The structural device includes: a mechanical seal, which is installed on the equipment shaft, The mechanical seal includes a sleeve, which is arranged on the equipment shaft, a transmission ring is provided at the end of the sleeve, a gland is connected to the sealing cavity by bolts, a static ring is installed in the gland, a dynamic ring is installed on the sleeve, and a flow channel is provided on the gland; The outer circle of the dynamic ring is provided with a pumping ring, and the pumping ring is provided with a small hole, and the small hole corresponds to the flow channel; The gland is provided with a flushing outlet and a flushing inlet, and the flushing inlet is fixed on the gland.

2. The structural device for improving the efficiency of the mechanical seal pumping ring according to claim 1, characterized in that: The flow channel is connected to the flushing outlet, and the width of the flow channel is greater than the width of the small hole.

3. The structural device for improving the efficiency of the mechanical seal pumping ring according to claim 2, characterized in that: The flow channel is provided with a baffle at a position close to the flushing outlet, and the flushing outlet is configured as a tangential outlet.

4. The structural device for improving the efficiency of the mechanical seal pumping ring according to claim 1, characterized in that: The mechanical seal further comprises a spring box assembly, one end of the dynamic ring is mounted in the spring box assembly, and the other end is in contact with the static ring.

5. The structural device for improving the efficiency of the mechanical seal pumping ring according to claim 1, characterized in that: The flushing outlet and the flushing inlet are respectively connected to a cooling system through pipelines.

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