Sealing structure for pulping pump

Abstract

The utility model relates to pulping and papermaking equipment, in particular to a sealing structure for a pulping pump, which comprises an output end bearing gland connected with a pump body; the framework oil seal is mounted in the oil seal mounting groove of the output end bearing gland; the rotary seal is arranged on the rotating shaft in a sleeving manner, synchronously rotates along with the rotating shaft and is in contact with the output end bearing gland; the rotating shaft is sleeved with the rotating seal, and the two framework oil seals are arranged in the oil seal installation groove in the outer side of the output end bearing gland. The rotating seal rotates along with the rotating shaft, external water vapor is thrown away from the bearing chamber through the centrifugal effect, the two framework oil seals form two seals, and the water vapor leaked in the axial direction of the rotating shaft is prevented from entering the bearing chamber. The rotary seal is a dynamic seal, the framework oil seal is a static seal, the dynamic seal and the static seal are combined to form an efficient sealing structure, and the problem that in the sealing process, external water vapor intrudes into a bearing chamber, and bearing lubrication fails is effectively solved.

Description

Technical Field

[0001] This utility model relates to a pulping and papermaking equipment, and more particularly to a sealing structure for a pulping pump. Background Technology

[0002] Bearings are an important component of pump products, and their service life directly affects the operating time of pump products; therefore, the sealing effect of the bearing housing of pump products is of paramount importance.

[0003] Currently, the sealing design of slurry pumps mainly prevents the leakage of lubricating grease from the bearing chamber, without considering the possibility of external moisture entering the bearing chamber. Water entering the bearing chamber can emulsify the lubricating grease inside the bearing, leading to bearing lubrication failure, equipment damage, production stoppage, and increased equipment maintenance costs. Utility Model Content

[0004] To address the issue of external moisture intrusion into the bearing chamber during the sealing process in traditional slurry pump designs, which can lead to bearing lubrication failure, this invention incorporates a rotary seal fitted onto the pump's shaft, rotating synchronously with it. A boss is formed on the outer side of the output end bearing cap, which contacts the rotary seal. An oil seal mounting groove is formed between the boss and the shaft, housing two skeleton oil seals. As the rotary seal rotates with the shaft, centrifugal force displaces external moisture from the bearing chamber, and the two skeleton oil seals form a double seal, preventing moisture leaking axially along the shaft from entering the bearing chamber. The rotary seal is a dynamic seal, while the skeleton oil seals are static seals; this combination creates a highly efficient sealing structure, effectively solving the problem of external moisture intrusion into the bearing chamber during the sealing process, leading to bearing lubrication failure.

[0005] The present invention adopts the following technical solution:

[0006] A sealing structure for a slurry pump, comprising:

[0007] Pump body;

[0008] An output end bearing cover is provided on one side of the pump body, and a boss is formed at the center of the surface of the output end bearing cover facing the outer side of the pump body;

[0009] A closed-end bearing cap is disposed on the other side of the pump body opposite to the output end bearing cap;

[0010] Two bearings are disposed inside the pump body, adjacent to the corresponding output end bearing cap and the corresponding closed end bearing cap;

[0011] The rotating shaft passes through the combined structure consisting of the output end bearing cover, the bearing, the pump body, and the closed end bearing cover;

[0012] A skeleton oil seal is installed in the oil seal mounting groove formed between the boss and the rotating shaft;

[0013] A rotary seal is fitted onto the rotating shaft, rotates synchronously with the rotating shaft, and contacts the boss;

[0014] Optionally, the rotary seal has an overall disc shape.

[0015] Optionally, the rotary seal has a forward lip and a reverse lip formed on the side surface facing the output bearing cap; both the forward lip and the reverse lip are frustoconical in shape and extend outward; starting from the plane facing the output bearing cap, the outward diameter of the forward lip gradually increases, and the outward diameter of the reverse lip gradually decreases; the reverse lip is closer to the center of the rotary seal, while the forward lip is farther from the center; the area between the forward lip and the reverse lip forms a second hydrophobic groove.

[0016] Optionally, the rotary seal has a water-blocking lip formed on the side surface facing the output end bearing cap; the water-blocking lip is located at the outermost edge of the rotary seal, is shaped like a frustum and extends outward; the diameter of the water-blocking lip gradually increases from the plane facing the output end bearing cap; the area between the water-blocking lip and the forward lip forms a first drainage groove.

[0017] Optionally, a bushing is formed on the side surface of the rotary seal away from the output end bearing cap, and a fixing through hole is machined in the radial direction of the bushing.

[0018] Optionally, the outer surface edges of the output end bearing cap and the closed end bearing cap are machined with several countersunk holes; the pump body has corresponding threaded blind holes at both ends, so that bolts can be installed in the combination structure of the countersunk holes and the threaded blind holes to realize the connection between the output end bearing cap, the closed end bearing cap and the pump body.

[0019] Optionally, the boss extends outward to form a ring plate portion, and the ring plate portion, together with the boss and the outer surface of the output end bearing cover, forms a water guide groove.

[0020] Optionally, two skeleton oil seals are installed inside the oil seal mounting groove.

[0021] The beneficial effects of this utility model are as follows:

[0022] A rotary seal is fitted onto the shaft of the slurry pump, rotating synchronously with the shaft. A boss is formed on the outer side of the output end bearing cap, which contacts the rotary seal. An oil seal mounting groove is formed between the boss and the shaft, and two skeleton oil seals are installed in the groove. Thus, as the rotary seal rotates with the shaft, centrifugal force throws external water vapor away from the bearing chamber, and the two skeleton oil seals form two seals, preventing water vapor leaking along the shaft axis from entering the bearing chamber. In this invention, the rotary seal is a dynamic seal, and the skeleton oil seals are static seals; the combination of dynamic and static seals constitutes a highly efficient sealing structure, effectively preventing external water vapor from entering the bearing chamber during the sealing process, extending the bearing's service life, and reducing equipment maintenance costs. Attached Figure Description

[0023] Figure 1 This is a cross-sectional schematic diagram of the pulping pump of this utility model.

[0024] Figure 2 This is a cross-sectional schematic diagram of the rotary seal of this utility model.

[0025] Figure 3 This is a cross-sectional view of the output end bearing cover of this utility model.

[0026] The numbers in the attached diagram are:

[0027] 10: Shaft; 20: Rotary seal; 30: Oil seal; 40: Output end bearing cover; 50: Bearing; 60: Pump body; 70: Closed end bearing cover; 80: Bolt.

[0028] 21: Water-blocking lip; 22: Forward lip; 23: Reverse lip; 24: First drainage groove; 25: Second drainage groove; 26: Bushing; 27: Fixed through hole.

[0029] 41: Countersunk hole; 42: Boss; 43: Oil seal mounting groove; 44: Water guide groove. Detailed Implementation

[0030] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings of the embodiments.

[0031] Figure 1 This is a cross-sectional schematic diagram of the pulping pump in this embodiment. (See attached diagram.) Figure 1As shown, the main body of the slurry pump includes a cylindrical pump body 60, a disc-shaped output end bearing cap 40, a disc-shaped closed end bearing cap 70, a bearing 50, and a rotating shaft 10. The output end bearing cap 40 and the closed end bearing cap 70 are respectively fitted onto both sides of the pump body 60. Furthermore, a plurality of countersunk holes 41 are evenly provided on the outer surface edges of the output end bearing cap 40 and the closed end bearing cap 70. Threaded blind holes corresponding to the countersunk holes 41 are provided at corresponding positions at both ends of the pump body 60. Bolts 80 are fitted within the combined structure of the countersunk holes 41 and the threaded blind holes to connect the output end bearing cap 40, the closed end bearing cap 70, and the pump body 60. The rotating shaft 10 is fitted within the combined structure of the output end bearing cover 40, the pump body 60, and the closed end bearing cover 70; two bearings 50 are located inside the pump body 60, adjacent to the output end bearing cover 40 and the closed end bearing cover 70, and the rotating shaft 10 passes through the two bearings 50. Figure 3 This is a cross-sectional view of the output bearing cap in this embodiment; as shown Figure 1 and Figure 3 As shown in the figure, the output end bearing cap 40 has an annular boss 42 formed on the surface facing the outside of the pump body 60, and the axial center of the boss 42 coincides with the axial center of the rotating shaft 10; at the same time, an oil seal mounting groove 43 is formed between the boss 42 and the rotating shaft 10, and two skeleton oil seals 30 are provided in the mounting groove. The two skeleton oil seals 30 achieve two seals to prevent water vapor from entering the bearing chamber.

[0032] As attached Figure 1 As shown, to solve the problem of external water vapor intruding into the bearing chamber of the pulping pump during the sealing process, leading to bearing lubrication failure, a rotary seal 20 is installed on the rotating shaft 10 of the pulping pump in this embodiment. The rotary seal 20 is installed on the outside of the output end bearing cover 40. At the same time, when the rotary seal 20 rotates synchronously with the rotating shaft 10, it contacts the boss 42 of the output end bearing cover 40 and maintains sliding. Thus, when the pulping pump is working, the external water vapor will be subjected to a strong centrifugal force at the rotary seal 20, thereby moving away from the boss 42 and the internally installed skeleton oil seal 30. In addition, the skeleton oil seal 30 can prevent the splashed lubricating grease from overflowing when the bearing 50 rotates.

[0033] Figure 2 This is a cross-sectional schematic diagram of the rotary seal in this embodiment. Figure 2 As shown, the rotary seal 20 is generally disc-shaped and made of a soft material such as rubber. A circular through-hole is machined at the center of the rotary seal 20. The diameter of the through-hole is the same as or slightly smaller than the diameter of the rotating shaft 10, so the rotary seal 20 can be fitted onto the rotating shaft 10. Figure 1 , Figure 2As shown, an annular bushing 26 is formed on the side of the rotary seal away from the output bearing cap 40. The bushing 26 has a fixed through hole 27 machined in the radial direction. Thus, the rotary seal 20 can be connected to the rotating shaft 10 as a whole through the fixed through hole 27 using bolts or pins, and rotate synchronously with the rotating shaft 10. A water-blocking lip 21, a forward lip 22, and a reverse lip 23 are formed on the side facing the output bearing cap 40. The water-blocking lip 21, the forward lip 22, and the reverse lip 23 are roughly truncated cone-shaped and extend outward, and the three are arranged coaxially. The water-blocking lip 21 is located at the outermost edge of the rotary seal 20, the reverse lip 23 is located at the end near the central circular through hole, and the forward lip 22 is located between the two. Thus, the area between the water-blocking lip 21 and the forward lip 22 forms the first drainage groove 24, and the area between the forward lip 22 and the reverse lip 23 forms the second drainage groove 25. Starting from the surface of the rotary seal 20 facing the output bearing cap 40, the diameter of the outwardly extending reverse lip 23 gradually decreases, while the diameters of the outwardly extending forward lip 22 and the water-blocking lip 21 gradually increase. Along the axial direction of the rotating shaft 10, the forward lip 22 and the reverse lip 23 have the same height, while the height of the water-blocking lip 21 is higher than that of the forward lip 22 and the reverse lip 23. When the rotary seal 20 is installed on the outside of the output bearing cap 40 and rotates synchronously with the rotating shaft 10, the forward lip 22 and the reverse lip 23 are in contact with and slide against the boss 42, forming a double waterproof layer. On the other hand, the shapes of the forward lip 22 and the reverse lip 23 cause the water vapor and condensate entering between the forward lip 22 and the reverse lip 23 to move away from the rotating shaft 10 under centrifugal force.

[0034] like Figure 1 and Figure 3 As shown, in order to increase the sliding contact area between the forward lip 22, the reverse lip 23 and the boss 42, the end face of the boss 42 that contacts the forward lip 22 and the reverse lip 23 extends outward along its own radial direction to form an annular plate portion; and the outer diameter of the annular plate portion is smaller than the diameter of the water-blocking lip 21 facing the output end bearing cap 40, and larger than the diameter of the forward lip 22 facing the output end bearing cap 40, and the inner diameter of the annular plate portion is consistent with the diameter of the through hole in the middle of the rotary seal 20. On the other hand, an annular water guide groove 44 is formed between the annular plate portion, the boss 42 and the outer surface of the output end bearing cap 40. Water vapor washed onto the outer surface of the output end bearing cap 40 by the external environment will form condensate on the outer surface of the output end bearing cap 40 and flow downward under the action of gravity. The water guide groove 44 timely guides the flowing condensate to prevent it from intruding into the interior of the output end bearing cap 40.

[0035] During use, two skeleton oil seals 30 need to be installed in the oil seal mounting groove 43 of the output bearing cover 40. The rotary seal 20 is then fitted onto the rotating shaft 10, securely fixed, and ensures that the forward lip 22 and reverse lip 23 of the rotary seal 20 are in contact with and can slide against the boss 42 of the output bearing cover 40. During the operation of the slurry pump, the rotary seal 20 rotates synchronously with the rotating shaft 10. Moisture washed onto the outer surface of the output bearing cover 40 from the external environment will condense on the outer surface of the output bearing cover 40. Under the action of gravity, the condensate flows downward. The water guide groove 44 of the output bearing cover 40 promptly guides the flowing condensate to prevent it from entering the interior of the output bearing cover 40. On the other hand, the water-blocking lip 21 of the rotary seal 20 will block some water vapor. At the same time, the condensate formed between the water-blocking lip 21 and the forward lip 22, as well as some water vapor, will gather into the first drainage groove 24 and be discharged by the centrifugal force generated by the rotation of the rotary seal 20. The small amount of water vapor and condensate entering between the forward lip 22 and the reverse lip 23 can be drained by the second drainage groove 25 formed between the forward lip 22 and the reverse lip 23, and under the centrifugal force, they will be thrown away from the rotating shaft 10 from the sliding contact surface of the annular plate portion of the forward lip 22, the reverse lip 23, and the boss 42.

[0036] In this invention, the rotary seal 20 is a dynamic seal and the skeleton oil seal 30 is a static seal. The combination of dynamic and static seals forms a highly efficient sealing structure, which solves the problem of external moisture intrusion into the bearing chamber, leading to bearing lubrication failure, extending the service life of the bearing, and reducing the maintenance cost of the equipment.

[0037] The above embodiments are merely a more detailed description of the present utility model. For those skilled in the art, modifications or equivalent substitutions can still be made to the technical solutions in the foregoing embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model patent.

Claims

1. A sealing structure for a slurry pump, characterized in that, include: Pump body; An output end bearing cover is provided on one side of the pump body, and a boss is formed at the center of the surface of the output end bearing cover facing the outer side of the pump body; A closed-end bearing cap is disposed on the other side of the pump body opposite to the output end bearing cap; Two bearings are disposed inside the pump body, adjacent to the corresponding output end bearing cap and the corresponding closed end bearing cap; The rotating shaft passes through the combined structure consisting of the output end bearing cover, the bearing, the pump body, and the closed end bearing cover; A skeleton oil seal is installed in the oil seal mounting groove formed between the boss and the rotating shaft; The rotary seal is fitted onto the rotating shaft, rotates synchronously with the shaft, and contacts the boss.

2. The sealing structure for a slurry pump according to claim 1, characterized in that: The rotary seal is disc-shaped.

3. The sealing structure for a slurry pump according to claim 2, characterized in that: The rotary seal has a forward lip and a reverse lip formed on the side surface facing the output bearing cap. Both the forward lip and the reverse lip are frustoconical in shape and extend outward. Starting from the plane facing the output bearing cap, the outward diameter of the forward lip gradually increases, while the outward diameter of the reverse lip gradually decreases. The reverse lip is close to the center of the rotary seal, while the forward lip is far from the center. The area between the forward lip and the reverse lip forms a second hydrophobic groove.

4. The sealing structure for a slurry pump according to claim 3, characterized in that: The rotary seal has a water-blocking lip formed on the side surface facing the output end bearing cap. The water-blocking lip is located at the outermost edge of the rotary seal, is shaped like a frustum and extends outward. Starting from the plane facing the output end bearing cap, the diameter of the water-blocking lip gradually increases outward. The area between the water-blocking lip and the forward lip forms a first drainage groove.

5. The sealing structure for a slurry pump according to claim 2, characterized in that: A bushing is formed on the side surface of the rotary seal away from the output end bearing cover, and a fixing through hole is machined in the radial direction of the bushing.

6. The sealing structure for a slurry pump according to claim 1, characterized in that: The outer surface edges of the output end bearing cap and the closed end bearing cap are both machined with several countersunk holes; the pump body has corresponding threaded blind holes at both ends, and bolts are installed in the combination structure of the countersunk holes and the threaded blind holes to realize the connection between the output end bearing cap, the closed end bearing cap and the pump body.

7. The sealing structure for a slurry pump according to claim 1, characterized in that: The boss extends outward to form a ring plate portion, and the ring plate portion, together with the boss and the outer surface of the output end bearing cover, forms a water guide groove.

8. The sealing structure for a slurry pump according to claim 1, characterized in that: Two skeleton oil seals are installed inside the oil seal mounting groove.

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