Single-end-face sealing structure and salt mining pump thereof
By combining the relative movement of the moving and static rings to compensate for the axial pressure of the spring, the problems of wear and leakage of the seals of the salt pump are solved, and the stable operation and long-life sealing effect of the salt pump are achieved.
Patent Information
- Application Number
- CN202422498144.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-10-15
AI Technical Summary
During the potassium salt mining process, the existing salt pump sealing technology causes frequent wear and leakage of sealing parts during the potassium salt mining process due to factors such as the unevenness of the ore slurry, high hardness, corrosiveness of the brine and variable cabin environment, which affects the equipment life and operating efficiency.
The dynamic seal is achieved by the relative movement of the moving ring and the static ring, and the axial pressure is provided by the compensation spring, so that the moving ring and the static ring are closely fitted to ensure the sealing effect.
It improves the operating stability and service life of salt harvesting pumps, reduces maintenance costs, and promotes technological progress and sustainable development of the potassium salt mining industry.
Smart Images
Figure CN223203679U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of salt mining pump seals, in particular to a single-end face sealing structure and a salt mining pump thereof. Background Art
[0002] In the potash mining industry, salt pumps, as key equipment, are responsible for transporting mixed potassium salt slurry containing different concentrations (5% to 40%) from the bottom of the salt lake to the processing system. However, in this process, the complex characteristics of the slurry pose a huge challenge to the stable operation of the salt pumps. Specifically, the particle size distribution of the material in the slurry is wide (0 to 50 mm), and the hardness of the salt ore is as high as 3.0. This unevenness and high hardness directly lead to violent vibrations in the salt pump during operation, which not only affects the service life of the pump, but also increases energy consumption and maintenance costs.
[0003] Furthermore, brine, as a supersaturated salt solution, is prone to crystallization, making the pump body and sealing components extremely susceptible to corrosion from the crystallized salt, exacerbating seal wear and failure. Brine is also highly corrosive, further shortening the service life of seals. Further complicating matters, the salt pumps are installed in the bilge of the salt mining vessel. The frequent movement of the salt mining vessel within the salt lake creates a harsh and volatile working environment. This, coupled with the lack of fresh water supply on board, limits the effective application of traditional sealing technologies.
[0004] Currently, the sealing methods widely used in the chemical industry, such as packing seals, mechanical seals, soft packing seals, and spiral seals, all demonstrate significant inadequacy in handling these special operating conditions. These sealing methods frequently leak, either because they are unable to effectively resist the erosion and corrosion of the slurry or because they struggle to adapt to changes in the sealing surface gap caused by pump vibration. According to statistics, the leakage interval of salt pumps using existing sealing technology generally does not exceed seven days. This not only leads to high maintenance costs but also seriously affects the continuity and efficiency of salt mining operations. Furthermore, leaking slurry and brine also deteriorate the working environment in the cabin, posing a threat to personnel health and equipment safety.
[0005] In view of the above technical background, there is an urgent need for a salt pump sealing device to solve the sealing problem faced in the potash mining process. Utility Model Content
[0006] The purpose of the utility model is to provide a single-end face sealing structure and a salt mining pump thereof to solve the problems existing in the above-mentioned prior art, to realize dynamic sealing by utilizing the relative movement of the dynamic ring and the static ring, and to provide axial pressure through the compensation spring so that the dynamic ring and the static ring fit tightly to ensure the sealing effect.
[0007] To achieve the above purpose, the present invention provides the following solutions:
[0008] The utility model provides a single-end face sealing structure, including a first shaft sleeve, a second shaft sleeve and a compensation spring, the first shaft sleeve is used for sealing connection to the transmission shaft, and a dynamic ring is installed on the first shaft sleeve; the second shaft sleeve is used for sealing connection to the machine seal cover, and a static ring for sliding sealing with the dynamic ring is installed on the second shaft sleeve; one end of the compensation spring abuts against an end of the second shaft sleeve away from the static ring, and the other end of the compensation spring abuts against the machine seal cover.
[0009] In one embodiment, the first sleeve is provided with a first flange, the dynamic ring is installed on the axial side of the first flange, the second sleeve is provided with a second flange, and the static ring is installed on the axial side of the second flange.
[0010] In one embodiment, it also includes a first end cover with a central opening, the first end cover is sleeved on the second shaft sleeve, the inner diameter side of the first end cover is sealed and connected to the second shaft sleeve, and the axial surface side of the first end cover is sealed and connected to the mechanical seal cover.
[0011] In one embodiment, it also includes a second end cover with a central opening, the axial length of the first sleeve is greater than the axial length of the second sleeve, the second end cover is sleeved on the first sleeve, and the second end cover is provided with a mounting groove for accommodating the compensation spring.
[0012] In one embodiment, an expansion sleeve is further included, wherein a portion of the first sleeve extending out of the second end cover is connected to the expansion sleeve, and the expansion sleeve is used to fasten the first sleeve to the transmission shaft.
[0013] In one embodiment, a third sleeve is further included, which is used to be sleeved between the inner diameter side of the first sleeve and the outer diameter side of the transmission shaft, and the third sleeve and the transmission shaft, as well as the third sleeve and the first sleeve, are sealed.
[0014] In one embodiment, the expansion connection sleeve includes an arc-shaped sleeve and a first compression sleeve and a second compression sleeve located on both sides of the arc-shaped sleeve, the inner diameter side of the first compression sleeve and the second compression sleeve are provided with a semi-arc that matches the outer diameter side of the arc-shaped sleeve, and the first compression sleeve and the second compression sleeve are connected by a compression screw.
[0015] In one embodiment, the dynamic ring is made of cemented carbide YWN8, and the static ring is made of cemented carbide YWN6.
[0016] The present utility model also provides a salt mining pump, comprising an impeller, a machine seal cover and the single-end face sealing structure as described above, wherein the impeller is used to be installed on a transmission shaft; the machine seal cover is used to be sealed and connected to a pump casing; the first shaft sleeve is sealed and connected to the transmission shaft, and the second shaft sleeve is sealed and connected to the machine seal cover.
[0017] In one embodiment, there is a first gap between the impeller and the mechanical seal cover, and a second gap between the inner diameter side of the mechanical seal cover and the single-end face sealing structure, the first gap is 30mm~40mm, and the second gap is 35mm~40mm; the first gap and the second gap are connected through a tapered channel, and the opening angle of the tapered channel is 70°~80°.
[0018] Compared with the prior art, the utility model has achieved the following technical effects:
[0019] The utility model utilizes the relative movement of the dynamic ring and the static ring to achieve dynamic sealing, and provides axial pressure through the compensation spring to make the dynamic ring and the static ring fit tightly, thereby ensuring the sealing effect, improving the operating stability and service life of the salt mining pump, reducing maintenance costs, and promoting technological progress and sustainable development in the potash mining industry. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0021] Figure 1 This is a schematic diagram of the installation of a single-end face sealing structure in an embodiment of the present utility model;
[0022] Figure 2 This is a schematic diagram of a single-end face sealing structure in an embodiment of the present utility model;
[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;
[0024] Among them, 1. impeller; 2. mechanical seal cover; 3. single end face seal structure; 4. expansion joint; 5. transmission shaft; 6. limit block; 7. first screw; 8. second screw;
[0025] 31. First sleeve; 311. Dynamic ring; 32. Second sleeve; 321. Static ring; 33. Compensating spring; 34. First end cover; 35. Second end cover; 36. Third sleeve;
[0026] 41. First compression sleeve; 42. Second compression sleeve; 43. Arc sleeve; 44. Third screw. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0028] The purpose of the utility model is to provide a single-end face sealing structure and a salt mining pump thereof to solve the problems existing in the prior art, realize dynamic sealing by utilizing the relative movement of the dynamic ring and the static ring, and provide axial pressure through the compensation spring so that the dynamic ring and the static ring fit tightly to ensure the sealing effect.
[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0030] like Figures 1 to 3As shown, the present invention provides a single-end face sealing structure, including a first sleeve 31, a second sleeve 32, and a compensation spring 33. The first sleeve 31 is used for sealing connection to the transmission shaft 5. To ensure sealing, an O-ring can be provided between the first sleeve 31 and the transmission shaft 5. The O-ring can be distributed in one or more rows in the axial direction. The first sleeve 31 can be directly fitted and connected to the transmission shaft 5, or it can be connected through other sleeves. A dynamic ring 311 is installed on the first sleeve 31. The dynamic ring 311 can be installed on the radial outer side or axial side of the first sleeve 31. The first sleeve 31 is provided with an annular groove for accommodating the dynamic ring 311. An O-ring can be provided in the annular groove to prevent leakage. Driven by the transmission shaft 5, the dynamic ring 311 rotates together with the first sleeve 31. The second sleeve 32 is used for sealing connection to the mechanical seal cover 2. The second sleeve 32 can be connected directly to the mechanical seal cover 2 or through other end covers. To ensure sealing, an O-ring is provided between the second sleeve 32 and the mechanical seal cover 2 or between the second sleeve 32 and the end cover. The mechanical seal cover 2 is used to be connected to the pump casing to facilitate the installation and removal of the impeller 1. The second sleeve 32 is provided with a static ring 321 for sliding sealing with the dynamic ring 311. The static ring 321 can be installed on the radially outer side or axial side of the second sleeve 32. The second sleeve 32 is provided with an annular groove to accommodate the static ring 321. An O-ring can be provided in the annular groove to prevent leakage. Since the second sleeve 32 remains stationary relative to the mechanical seal cover 2, the static ring 321 remains stationary relative to the mechanical seal cover 2. The dynamic ring 311 and the static ring 321 form a mechanical seal friction pair that can maintain a sealed state while moving relative to each other. One end of the compensation spring 33 abuts the end of the second sleeve 32 away from the static ring 321, while the other end of the compensation spring 33 abuts the mechanical seal 2. Note that this abutment can be made directly or indirectly on the end cap connected to the mechanical seal 2. The compensation spring 33 provides axial compressive force between the static ring 321 and the dynamic ring 311, maintaining a tight fit between the dynamic ring 311 and the static ring 321, ultimately improving the sealing effect.
[0031] The utility model utilizes the relative movement of the dynamic ring 311 and the static ring 321 to achieve dynamic sealing, and provides axial pressure through the compensation spring 33 to make the dynamic ring 311 and the static ring 321 fit tightly, thereby ensuring the sealing effect, improving the operating stability and service life of the salt mining pump, reducing maintenance costs, and promoting technological progress and sustainable development in the potash mining industry.
[0032] In one embodiment, the first sleeve 31 is provided with a first flange, and the dynamic ring 311 is mounted on the axial side of the first flange, with the dynamic ring 311 facing the stationary ring 321. The second sleeve 32 is provided with a second flange, and the stationary ring 321 is mounted on the axial side of the second flange, with the stationary ring 321 facing the dynamic ring 311. The first flange of the first sleeve 31 and the second flange of the second sleeve 32 are axially opposed to each other, so that the dynamic ring 311 and the stationary ring 321 always maintain contact.
[0033] In one embodiment, the assembly further includes a first end cap 34 with a central opening. The first end cap 34 is sleeved onto the second sleeve 32. The inner diameter side of the first end cap 34 is sealed to the second sleeve 32. An O-ring may be disposed between the first end cap 34 and the second sleeve 32 to maintain the seal. The axial side of the first end cap 34 is sealed to the mechanical seal 2. An O-ring may be disposed between the first end cap 34 and the mechanical seal 2 to maintain the seal. The first end cap 34 and the mechanical seal 2 are fastened together by first screws 7, which are evenly distributed circumferentially.
[0034] In one embodiment, a second end cap 35 with a central opening is further included. The axial length of the first sleeve 31 is greater than that of the second sleeve 32. The second end cap 35 is sleeved onto the first sleeve 31 and is located on the side of the second sleeve 32 away from the stationary ring 321, i.e., the second end cap 35 is located outside the salt pump. The second end cap 35 is provided with a mounting groove for accommodating the compensation spring 33. The second end cap 35 can be connected to the first end cap 34 via second screws 8, which are evenly distributed circumferentially.
[0035] In one embodiment, an expansion sleeve 4 is further included. The portion of the first sleeve 31 extending beyond the second end cap 35 is connected to the expansion sleeve 4. The expansion sleeve 4 is used to secure the first sleeve 31 to the drive shaft 5, so that rotation of the drive shaft 5 drives rotation of the first sleeve 31. The expansion sleeve 4 can be a tapered sleeve. This tapered structure allows axial pressure to be converted into radial pressure to compress the first sleeve 31 and the drive shaft 5.
[0036] In one embodiment, a third sleeve 36 is further included. The third sleeve 36 is used to be sleeved between the inner diameter side of the first sleeve 31 and the outer diameter side of the transmission shaft 5. The third sleeve 36 and the transmission shaft 5 and the third sleeve 36 and the first sleeve 31 are sealed. The sealing connection can use an O-ring to seal the gaps between the impeller 1, the first sleeve 31, the third sleeve 36 and the transmission shaft 5 to avoid leakage.
[0037] In one embodiment, the expansion connection sleeve 4 includes an arc sleeve 43 and a first compression sleeve 41 and a second compression sleeve 42 located on both sides of the arc sleeve 43. The inner diameter side of the first compression sleeve 41 and the second compression sleeve 42 is provided with a semi-arc that matches the outer diameter side of the arc sleeve 43. The first compression sleeve 41 and the second compression sleeve 42 are connected by a compression screw. The compression screw adopts a third screw 44. By rotating the third screw 44, the axial position between the first compression sleeve 41 and the second compression sleeve 42 can be adjusted, and the pressure is converted into radial pressure under the cooperation of the semi-arc and the arc sleeve 43, thereby pressing the first sleeve 31 onto the drive shaft 5 or disassembling it when repair / replacement is needed.
[0038] In one embodiment, the dynamic ring 311 is made of cemented carbide YWN8, and the static ring 321 is made of cemented carbide YWN6. The main components of YWN8 and YWN6 include tungsten carbide (WC) and cobalt (Co), and may sometimes also contain nickel (Ni). These alloys have advantages such as high hardness, wear resistance, high temperature resistance, low linear expansion coefficient, low friction coefficient, and good assembly performance. They also have good wear resistance, corrosion resistance, long service life, and good toughness and service life. In addition, YWN8 has higher strength and hardness than YWN6, and YWN8 has better impact resistance and vibration resistance than YWN6, but YWN8 has lower wear resistance than YWN6.
[0039] In one embodiment, the mechanical seal cover 2, the first end cover 34 and the expansion connection sleeve 4 are made of S22053 material; the compensation spring 33 is made of Hastelloy C-276; the O-ring is made of fluorosilicone rubber; and each screw is made of A4-80.
[0040] Reference again Figures 1 to 3 The present invention also provides a salt extraction pump comprising an impeller 1, an engine cover 2, and the single-end seal structure 3 described above. The impeller 1 is mounted on a drive shaft 5 located inside the pump casing, and the drive shaft 5 transmits power to the impeller 1. The engine cover 2 is hermetically connected to the pump casing. A first sleeve 31 is hermetically connected to the drive shaft 5, and a second sleeve 32 is hermetically connected to the engine cover 2. The single-end seal structure 3 seals the drive shaft 5 where it passes through the engine cover 2.
[0041] In one embodiment, there is a first gap between the impeller 1 and the mechanical cover 2, such as Figure 1 As shown in S, there is a second gap between the inner diameter side of the mechanical seal cover 2 and the single end face sealing structure 3, as shown in Figure 1 The first clearance S is 30mm~40mm, and the second clearance is 35mm~40mm. Figure 1 As shown, the salt slurry enters the first gap and the second gap between the outer side of the mechanical seal friction pair and the mechanical seal cover 2 along the slurry leakage direction. The centrifugal force of the impeller 1 in the salt pump is used to quickly throw out the salt slurry in the first gap and the second gap, and at the same time, the heat generated by the mechanical seal friction pair is also taken away. Therefore, an independent circulating cooling and lubrication system does not need to be set up.
[0042] In one embodiment, the first gap and the second gap are connected through a tapered channel, and the opening angle of the tapered channel is as follows: Figure 1 The open structure of the conical channel makes it easy for large-diameter salt ore to enter the outer side of the mechanical seal friction pair, and also makes it easy to use the centrifugal force of the impeller 1 to throw the large-diameter salt ore away from the outer side of the mechanical seal friction pair.
[0043] In one embodiment, the single-end seal structure 3 is installed as follows: first, position the stopper 6 over the shoulder of the drive shaft 5, loosen the expansion sleeve 4, and then position the single-end seal structure 3 over the drive shaft 5, pressing against the stopper 6. The first screw 7 is then connected to the mechanical seal cover 2. The drive shaft 5 is then connected to the impeller 1 of the salt pump to form an integrated structure, which is then docked with the pump casing. After installation is complete, the impeller 1 is rotated, the expansion sleeve 4 is tightened, and the pump cavity of the salt pump is filled with water to a level above the centerline of the impeller 1 before the pump is started.
[0044] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.
Claims
1. A single-end sealing structure, characterized in that: include: a first sleeve, the first sleeve being used for sealingly connecting to the transmission shaft, and a dynamic ring being mounted on the first sleeve; a second shaft sleeve, the second shaft sleeve being used for sealing connection to the machine seal cover, and a static ring being installed on the second shaft sleeve for sliding sealing with the dynamic ring; and a compensation spring, one end of which abuts against an end of the second sleeve away from the static ring, and the other end of which abuts against the machine seal cover.
2. The single-end sealing structure according to claim 1, characterized in that: The first sleeve is provided with a first flange, the dynamic ring is installed on the axial surface side of the first flange, the second sleeve is provided with a second flange, and the static ring is installed on the axial surface side of the second flange.
3. The single-end sealing structure according to claim 1, characterized in that: It also includes a first end cover with a hole in the middle, the first end cover is sleeved on the second shaft sleeve, the inner diameter side of the first end cover is sealed and connected to the second shaft sleeve, and the axial surface side of the first end cover is sealed and connected to the machine seal cover.
4. The single-end sealing structure according to claim 3, characterized in that: It also includes a second end cover with a hole in the middle. The axial length of the first sleeve is greater than the axial length of the second sleeve. The second end cover is sleeved on the first sleeve. The second end cover is provided with a mounting groove for accommodating the compensation spring.
5. The single-end sealing structure according to claim 4, characterized in that: It also includes an expansion connecting sleeve, and the portion of the first sleeve extending out of the second end cover is connected to the expansion connecting sleeve, and the expansion connecting sleeve is used to fasten the first sleeve to the transmission shaft.
6. The single-end sealing structure according to claim 5, characterized in that: It also includes a third sleeve, which is used to be sleeved between the inner diameter side of the first sleeve and the outer diameter side of the transmission shaft. The third sleeve and the transmission shaft, as well as the third sleeve and the first sleeve, are sealed.
7. The single-end sealing structure according to claim 5, characterized in that: The expansion connection sleeve includes an arc-shaped sleeve and a first compression sleeve and a second compression sleeve located on both sides of the arc-shaped sleeve. The inner diameter sides of the first compression sleeve and the second compression sleeve are provided with a semi-arc shape that matches the outer diameter side of the arc-shaped sleeve. The first compression sleeve and the second compression sleeve are connected by a compression screw.
8. The single-end sealing structure according to claim 1, characterized in that: The material of the dynamic ring is hard alloy YWN8, and the material of the static ring is hard alloy YWN6.
9. A salt mining pump, characterized in that: include: an impeller, the impeller being mounted on a transmission shaft; A machine sealing cover, the machine sealing cover is used for sealingly connecting with the pump casing; And the single-end face sealing structure according to any one of claims 1 to 8, wherein the first sleeve is sealingly connected to the transmission shaft, and the second sleeve is sealingly connected to the machine seal cover.
10. The salt mining pump according to claim 9, characterized in that: There is a first gap between the impeller and the mechanical seal cover, and a second gap between the inner diameter side of the mechanical seal cover and the single-end face sealing structure. The first gap is 30mm~40mm, and the second gap is 35mm~40mm; the first gap and the second gap are connected through a tapered channel, and the opening angle of the tapered channel is 70°~80°.