Anti-winding structure of defibering pump
The blocking ring seals the gap between the impeller and pump end cover, preventing foreign material entanglement and ensuring stable operation by using hydraulic fluid pressure and centrifugal force.
Patent Information
- Application Number
- CN202422534842.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-10-21
AI Technical Summary
During the slurry treatment process of the dissolving pump, the pump shaft is prone to wrapping impurities, causing the motor to be overloaded, affecting the stability of production and operation.
A barrier ring is installed between the impeller of the discharging pump and the rear end cover of the pump to form a barrier of the radial annular gap, forming a sealed water chamber sealed on the pump shaft, and isolates impurities by using the pressure and centrifugal force of the sealed water to prevent winding.
Effectively prevent impurities from being wound on the pump shaft, ensure stable operation of the equipment, reduce the load of the transmission motor, avoid overload tripping, simplify manufacturing and low cost.
Smart Images
Figure CN223104776U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of papermaking pulp treatment, and more specifically to an anti-winding structure for a defibrator pump. Background Art
[0002] In existing papermaking enterprises, the working purpose of the defibrator pump is as follows: After the waste paper pulp defibrated by the "pulper" is precipitated in the "slag collecting tank" to remove heavy slag such as heavy iron blocks and stones, the pulp with a concentration of 3% - 3.5% in the upper part of the "slag collecting tank" containing light impurities such as plastic skins enters the "defibrator pump" for crushing and pumping. The pulp containing light impurities such as plastic skins enters the interior of the defibrator pump housing through the inlet of the defibrator pump and is crushed and pumped under the drive of the impeller. When the pneumatic valve on the outlet pipe of the defibrator pump is closed, the pulp containing impurities is retained in the pump housing and makes a circular motion under the drive of the impeller, rubbing against each other and colliding with the ribs on the impeller, so that the paper sheets that are not completely defibrated in the pulp are further defibrated and broken; when the pneumatic valve on the outlet pipe of the defibrator pump is opened, the defibrator pump functions as a pulp pump, and the pulp containing impurities is pumped to downstream equipment for further treatment under the drive of the centrifugal force of the impeller through the pump outlet. By intermittently controlling the opening and closing state of the pneumatic valve on the outlet pipe (automatically controlled according to the set time), the residence and pumping time of the pulp containing impurities in the defibrator pump can be adjusted to realize the control of the defibrating and pumping states. Defibrating is to further defibrate the paper sheets that are not completely defibrated into pulp to reduce fiber loss; pumping is to send impurities such as plastic skins contained in the pulp to downstream equipment for removal.
[0003] After the pulp containing impurities such as plastic skins enters the defibrator pump, as Figure 5 shown, since there is a gap 6 of about 20 mm between the impeller 2 of the defibrator pump and the rear end cover 1 of the pump body, the impurities contained in the pulp entering the defibrator pump are mainly plastic skins, and there are also a small amount of packing plastic ropes and packing iron wires of waste paper raw materials. The long plastic skins, packing ropes and iron wires will enter the gap between the pump impeller and the rear end cover and wind around the pump shaft. The more it winds, the more it forms a large, thick and strong plastic mass. This plastic mass tightly hugs the pump shaft and generates great friction with the rear end cover of the pump body, increasing the load of the driving motor and resulting in overload tripping, affecting the stability of production operation. Content of the Utility Model
[0004] 1. Technical Problem to be Solved by the Utility Model
[0005] Aiming at the problem that the pump shaft of the defibrator pump is prone to winding impurities and causing motor overload during the pulp treatment process in the prior art, the utility model provides an anti-winding structure for a defibrator pump. By blocking the radial annular gap that is prone to winding with a blocking ring, a cavity for the sealing water of the shaft seal on the pump shaft is formed, so as to achieve the purpose of preventing the pump shaft from winding impurities.
[0006] 2. Technical Solution
[0007] To achieve the above object, the technical solution provided by the present utility model is as follows:
[0008] An anti-winding structure for a relief pump, including a radial annular gap formed between a coaxial impeller and a pump rear end cover, further including a blocking ring coaxial with the radial annular gap and fixed to the pump rear end cover through its ring fixed end. After the blocking ring annularly blocks the radial annular gap, a sealing water cavity for the mechanical seal water on the pump shaft is formed. While forming the mechanical seal, it also avoids impurities such as plastic skins, packing plastic ropes, and packing iron wires from winding around the pump shaft.
[0009] Further technical solution, the diameter of the blocking ring is slightly larger than the diameter of the impeller.
[0010] Further technical solution, the height of the blocking ring is greater than the thickness of the radial annular gap. An axial gap is formed between the inner ring surface of the blocking ring and the circumferential surface of the impeller. In the sealing water cavity, the mechanical seal water on the pump shaft flows in. The sealing water continuously flows in and fills the cavity to form a certain pressure in the cavity. Then, the sealing water passes through the axial gap between the inner ring surface of the blocking ring and the impeller and sprays out under the action of pressure and the centrifugal force of the pump impeller. The sprayed sealing water plays an isolation and sealing role.
[0011] Further technical solution, reinforcing ribs are fixed on the outer ring surface of the blocking ring, and the bottom ends of the reinforcing ribs are fixed to the pump rear end cover to improve the fixing and blocking strength of the blocking ring.
[0012] Further technical solution, the thickness of the axial gap is 1.0 mm to 3.0 mm. While playing the role of isolation and sealing, the slurry and fine debris cannot enter from the gap of this axial gap into the space between the impeller and the pump rear end cover, thus always ensuring that the pump shaft is clean and free of any foreign object winding.
[0013] Further technical solution, the height of the blocking ring is 1.5 to 2.5 times the thickness of the radial annular gap to form an axial gap with an appropriate width.
[0014] 3. Beneficial effects
[0015] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:
[0016] The anti - winding structure of the pulping pump of the utility model: after the blocking ring of the circular ring structure is welded to the rear end cover of the pulping pump, a small cavity is formed among the circular ring, the rear end cover and the back of the impeller of the pulping pump. This small cavity just has the sealing water of the shaft seal on the pump shaft flowing in. The sealing water continuously flows in and fills the cavity to form a certain pressure in the cavity. Then, the sealing water sprays out through the gap between the newly added circular ring and the pump impeller under the action of the pressure and the centrifugal force of the pump impeller. The sprayed sealing water plays an isolation and sealing role, so that the slurry and small sundries cannot enter from this gap between the impeller and the rear end cover of the pump, thus always ensuring that the pump shaft is clean without any foreign matter winding. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a vertical sectional structure schematic diagram of the anti - winding structure of the pulping pump in a specific embodiment.
[0018] Figure 2 It is Figure 1 The enlarged structure schematic diagram of part A in
[0019] Figure 3 It is a front - view structure schematic diagram of the anti - winding structure of the pulping pump in a specific embodiment.
[0020] Figure 4 It is a front - view structure schematic diagram of the blocking ring in the anti - winding structure of the pulping pump in a specific embodiment.
[0021] Figure 5 It is a partial sectional structure schematic diagram of the pulping pump in the prior art.
[0022] In the figure: 1 - rear end cover of the pump; 2 - impeller; 3 - blocking ring; 5 - axial clearance; 6 - radial annular clearance; 7 - pump shaft; 21 - pump blade; 31 - reinforcing rib; 61 - sealing water cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] To further understand the content of the present utility model, the utility model will be described in detail in combination with the drawings.
[0024] Embodiment 1
[0025] The anti - winding structure of the pulping pump in this embodiment, as shown in Figure 1 , 2 , 3, 4, includes the radial annular clearance 6 formed between the coaxial impeller 2 and the rear end cover 1 of the pump and the blocking ring 3 coaxial with the radial annular clearance 6. The blocking ring 3 is fixed to the rear end cover 1 through its own ring fixed end. After the blocking ring 3 annularly blocks the radial annular clearance 6, a sealing water cavity 61 for the shaft seal sealing water of the pump shaft is formed. While forming the shaft seal, it also avoids the winding of impurities such as plastic skins, packing plastic ropes, and packing iron wires on the 7 pump shaft of the pulping pump.
[0026] Embodiment 2
[0027] The anti-winding structure of the pulping pump in this embodiment has the same basic structure as that in Embodiment 1. The differences or improvements are as follows: As Figure 1 , 2 shown, the diameter of the blocking ring 3 is slightly larger than that of the radial annular gap 6 and the impeller 2. The height of the blocking ring 3 is greater than the thickness of the radial annular gap 6. An axial gap 5 is formed between the inner ring surface of the blocking ring 3 and the circumferential surface of the impeller 2. In the sealed water chamber 61, the sealed water of the shaft mechanical seal on the pump shaft flows in. The sealed water continuously flows in and fills the cavity to form a certain pressure in the cavity. Then, the sealed water passes through the axial gap 5 between the inner ring surface of the blocking ring 3 and the impeller 2 and sprays out under the action of the pressure and the centrifugal force of the pump impeller. The sprayed sealed water plays an isolation and sealing role. Six reinforcing ribs 31 are fixed on the outer ring surface of the blocking ring 3, usually six uniformly distributed reinforcing ribs 31. The bottom ends of the reinforcing ribs 31 are fixed to the pump rear end cover 1 to improve the fixing and blocking strength of the blocking ring 3. The thickness of the axial gap 5 is 1.0 mm to 3.0 mm. While playing the isolation and sealing role, the slurry and small sundries cannot enter the impeller from the gap of this axial gap 5 to between the pump rear end cover, so as to always ensure that the pump shaft is clean and free of any foreign object winding. The height of the blocking ring 3 is 1.5 to 2.5 times the thickness of the radial annular gap 6 to form an axial gap 5 with an appropriate width.
[0028] Embodiment 3
[0029] The anti-winding structure of the pulping pump in this embodiment has the same basic structure as that in Embodiment 2. The differences or improvements are as follows: The thickness of the circular ring of the blocking ring 3 is 8 mm, the inner diameter of the circular ring is 654 mm, and six triangular reinforcing ribs 31 are evenly distributed around the outer side surface of the circular ring. The diameter of the impeller for the pulping pump is 650 mm. The diameter of the circular ring is 4 mm larger than the diameter of the impeller 2. The height of the circular ring is 40 mm. The center of the circular ring is concentric with the center of the impeller 2. The circular ring is welded to the pump rear end cover 1 of the pulping pump. The newly added circular ring has the effect of blocking sundries from winding around the pump shaft 7:
[0030] 1. The 20-mm large gap between the pump blade 21 of the original impeller 2 and the rear end cover 1 is blocked by the welded circular ring, and a 2-mm gap is reserved between the circular ring and the outer edge of the pump blade 21. In this way, large impurities such as plastic skins and packing ropes cannot approach the pump shaft;
[0031] 2. After the ring is welded to the rear end cover 1 of the defiberizing pump, a small sealed water chamber 61 is formed among the ring, the pump rear end cover 1, and the back surface of the defiberizing pump impeller 2. This small cavity just has the sealed water of the shaft seal on the pump shaft 7 flowing in. The sealed water continuously flows in and fills the cavity of the sealed water chamber 61, and forms a certain pressure in the cavity. Then, the sealed water passes through the 2-mm axial gap 21 between the newly added ring and the pump impeller, and is ejected under the action of the pressure and the centrifugal force of the impeller 21 of the pump impeller. The ejected sealed water plays an isolation and sealing role, so that the slurry and fine debris cannot enter from this 2-mm axial gap 21 into the space between the impeller 2 and the pump rear end cover 1, thus always ensuring that the pump shaft 7 is clean without any foreign objects winding around it.
[0032] In the defiberizing pump anti-winding structure of this embodiment, the ring of the blocking ring 3 can play a very good blocking role. At the same time, the 2-mm gap just allows the sealed water of the pump shaft 7 to overflow in a jet shape, playing a role in further blocking the fine impurities below 2 mm from entering the gap of the axial gap 5.
[0033] The anti-winding structure of this embodiment does not damage the original structure of the equipment, is simple in manufacturing and processing, has strong practicability, makes the equipment operate more stably, has a simple structure, is practical, efficient, safe, easy to operate, has low cost, and is convenient for popularization.
[0034] The above schematically describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention. The actual structure and manufacturing steps are not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design, without creative work, a structural manner and an embodiment similar to this technical solution without departing from the gist of the present invention, they shall fall within the protection scope of the present invention.
Claims
1. An anti-winding structure for a relief pump, including a radial annular gap (6) formed between a coaxial impeller (2) and a pump rear end cover (1), characterized in that: It further includes a blocking ring (3) coaxial with the radial annular gap (6), and is fixed to the rear end cover (1) of the pump through its ring fixed end. After the blocking ring (3) annularly blocks the radial annular gap (6), a sealed water chamber (61) is formed.
2. The anti-winding structure of the relief pump according to claim 1, wherein: The diameter of the blocking ring (3) is slightly larger than that of the radial annular gap (6) and the impeller (2).
3. The anti-winding structure of the relief pump according to claim 1, characterized in that: The height of the blocking ring (3) is greater than the thickness of the radial annular gap (6), and an axial gap (5) is formed between the inner ring surface of the blocking ring (3) and the circumferential surface of the impeller (2).
4. The anti-winding structure of the relief pump according to claim 1, wherein: Reinforcing ribs (31) are fixed on the outer ring surface of the blocking ring (3), and the bottom ends of the reinforcing ribs (31) are fixed to the rear end cover (1) of the pump.
5. The anti-winding structure of the relief pump according to claim 3, wherein: The thickness of the axial gap (5) is 1.0 mm to 3.0 mm.
6. The anti-winding structure of the relief pump according to any one of claims 1 to 5, characterized in that: The height of the blocking ring (3) is 1.5 to 2.5 times the thickness of the radial annular gap (6).