Pump shell sealing system of pre-heating pump

Abstract

The invention relates to a preheating pump shell sealing system and relates to the technical field of preheating pump sealing, the preheating pump shell sealing system comprises a shell, a pump shaft and an impeller, the shell comprises a front pump shell and a rear pump shell, and the front pump shell and the rear pump shell are connected through a pump body stud to form a closed cavity; the pump shaft is rotationally connected to the rear pump shell, the impeller is fixed to the end of the pump shaft, and a mechanical seal is arranged between the pump shaft and the rear pump shell. A liquid inlet port is formed in the front pump shell, a liquid outlet port communicated with the liquid inlet port is formed in the shell, and an inlet sealing gasket and an outlet sealing gasket are fixed to the liquid inlet port and the liquid outlet port respectively; a front protection plate is arranged in the front pump shell, a rear protection plate is arranged in the rear pump shell, and a volute is arranged between the front protection plate and the rear protection plate. A rib plate supporting structure used for strengthening the overall structural strength and rigidity is further arranged on the outer side of the shell, and a pressing module used for fixing the shell and the volute and strengthening the sealing performance between the front pump shell and the rear pump shell at the same time is arranged between the front pump shell and the rear pump shell. The pre-heating pump has the effect of enhancing the sealing performance of the pre-heating pump.

Description

Technical Field

[0001] This application relates to the field of preheating pump sealing technology, and in particular to a preheating pump casing sealing system. Background Technology

[0002] In recent years, energy transformation has deepened, and new energy technologies have developed well. With the explosive growth in demand for new energy vehicles, the demand for nickel used in power batteries has also surged. High-pressure acid leaching (HPAL) smelting, as a crucial raw material source for battery-grade nickel sulfate, plays a vital role in the nickel industry chain in the new energy era. The high-temperature, high-pressure environment is the core of HPAL technology; high temperatures allow for complete chemical reactions, increasing the leaching rates of nickel and cobalt. The preheating pump, as the core pump in this process system, is undeniably important. With the rapid development of the new energy industry, the performance and reliability requirements for preheating pumps are becoming increasingly stringent. The development of related technologies is of great significance for the stable operation and efficient production of the entire nickel smelting industry chain.

[0003] In the past, several methods were commonly used to address pump casing sealing issues. One method involved using ordinary gaskets, achieving a seal through simple compression. This approach is typically simple in structure and relatively inexpensive, and is common in applications where sealing requirements are not stringent. Another method involved increasing the wall thickness of the pump casing to enhance the overall structural strength and reduce the risk of leakage due to factors such as pressure and corrosion. However, this method increases the weight and cost of the pump.

[0004] However, due to the high-pressure acid leaching medium transported by the preheating pump, which is characterized by high temperature, high pressure, high corrosiveness, and strong abrasion, ordinary gaskets are prone to failure under high temperature, high pressure, and corrosive environments, and cannot guarantee long-term effective sealing. While simply increasing the pump casing wall thickness can improve strength to some extent, it cannot fundamentally solve the sealing problem and will make the pump structure bulky, which is not conducive to installation and maintenance. Summary of the Invention

[0005] To enhance the sealing performance of a preheating pump, this application provides a preheating pump casing sealing system.

[0006] This application provides a preheating pump casing sealing system, which adopts the following technical solution: A preheating pump casing sealing system includes a casing, a pump shaft and an impeller, wherein the casing includes a front pump casing and a rear pump casing, and the front pump casing and the rear pump casing are connected by pump body studs to form a sealed cavity. The pump shaft is rotatably connected to the rear pump housing, the impeller is fixed to the end of the pump shaft, and a mechanical seal is provided between the pump shaft and the rear pump housing; The front pump housing is provided with an inlet port, and the housing is provided with an outlet port that communicates with the inlet port. The inlet port and the outlet port are respectively fixed with an inlet sealing gasket and an outlet sealing gasket. The front pump housing is provided with a front protective plate, the rear pump housing is provided with a rear protective plate, and a volute is provided between the front protective plate and the rear protective plate. The volute is sleeved on the outside of both the front protective plate and the rear protective plate. The outer side of the housing is also provided with a stiffening plate support structure to enhance the overall structural strength and rigidity. A clamping module is provided between the front pump housing and the rear pump housing to fix the housing and the volute while enhancing the sealing between the front pump housing and the rear pump housing.

[0007] By adopting the above technical solution, when the preheating pump is working, the slurry enters from the inlet port, flows through the inlet gasket, front guard plate, impeller, and volute, and finally exits from the outlet gasket. During this process, the pump shaft is rotatably connected to the rear pump casing, and the impeller, fixed to the end of the pump shaft, rotates accordingly to achieve slurry delivery. The mechanical seal between the pump shaft and the rear pump casing, the inlet gasket at the inlet port, and the outlet gasket at the outlet port constitute the first seal to prevent slurry leakage. The front and rear pump casings are connected by pump body studs to form a sealed cavity, constituting the second seal to protect the internal flow components. The stiffening plate support structure strengthens the overall structural strength and rigidity, preventing torsional deformation caused by uneven stress; the clamping module fixes the casing and volute, strengthening the sealing between the front and rear pump casings; the entire pump casing sealing structure has high strength, good sealing performance, and high safety, making it suitable for the high temperature, high pressure, and high abrasion conditions of the preheating pump. It can effectively avoid the failure of ordinary gaskets in high temperature, high pressure, and corrosive environments, and will not make the pump structure bulky as simply increasing the pump casing wall thickness, which is beneficial for installation and maintenance.

[0008] Optionally, the clamping module includes an arc-shaped block fixed to the outside of the volute. The front pump housing and the rear pump housing are in a planar arrangement on their contact sides. One side of the arc-shaped block is also in a planar arrangement parallel to the contact sides of the front pump housing and the rear pump housing. A pressure plate is provided on one side of the planar side of the arc-shaped block. A clamping stud is fixed on the pressure plate. The end of the clamping stud away from the pressure plate passes through the rear pump housing and is threaded with a locking nut. The rear pump housing has an arc-shaped groove, and the pressure plate is embedded in the arc-shaped groove and locked to the arc-shaped block on the volute by the clamping stud.

[0009] By adopting the above technical solution, during installation, the plane of one side of the arc-shaped block fixed to the outside of the volute is kept parallel to the plane of the contact side of the front and rear pump housings. The pressure plate is placed on one side of the plane of the arc-shaped block, so that the clamping stud on the pressure plate passes through the rear pump housing. Then, the locking nut is threaded onto the end of the clamping stud away from the pressure plate. At the same time, an arc-shaped notch is opened on the rear pump housing, and the pressure plate is embedded in the arc-shaped notch. By tightening the locking nut, the pressure plate is locked to the arc-shaped block on the volute through the clamping stud. The clamping module can quickly and stably fix the housing and volute, enhance the sealing between the front and rear pump housings, and prevent the components from loosening due to pressure or vibration. At the same time, the clamping force can be precisely controlled by the cooperation of the clamping stud and the locking nut to ensure that the sealing effect reaches the optimal state and to avoid leakage of the high-pressure acid immersion medium transported by the preheating pump.

[0010] Optionally, two clamping modules are provided along the axis of the liquid inlet port, and the included angle between the two clamping modules relative to the axis of the liquid inlet port is α, where 155°≤α≤165°.

[0011] By adopting the above technical solution, two clamping modules are set along the axis of the liquid inlet port. The included angle between the two clamping modules and the axis of the liquid inlet port is 155°-165°. During operation, the two clamping modules fasten the housing and volute through their respective pressure plates, clamping studs and locking nuts, so that when a fastening force is applied to the pump housing and volute, the force can be evenly distributed in the corresponding parts of the pump housing, thereby enhancing the sealing performance.

[0012] Optionally, the contact side between the front pump housing and the rear pump housing is a reference machined surface that has been precision ground, and the surface roughness Ra of the reference machined surface is ≤1μm.

[0013] By adopting the above technical solution, the contact side of the front pump housing and the rear pump housing is precision ground to form a reference machining surface, so that the surface roughness Ra of the reference machining surface is Ra≤1μm. During the pump assembly process, the high-precision surface treatment can make the front pump housing and the rear pump housing fit tightly together, reducing the gap between them. Thus, when the preheating pump is working, the high-temperature and high-pressure medium flowing in the pump is difficult to leak from the contact point, improving the sealing performance between the front pump housing and the rear pump housing.

[0014] Optionally, the rib support structure includes an annular rib fixed around the outside of the pump casing axis, a first vertical rib extending radially along the pump casing, a plurality of spaced horizontal ribs fixed near the liquid outlet port, and a second vertical rib connecting the plurality of horizontal ribs; the annular rib, the first vertical rib, the horizontal ribs, and the second vertical rib form a composite mesh rib reinforcement structure.

[0015] By adopting the above technical solution, the annular ribs, the first vertical ribs, the horizontal ribs, and the second vertical ribs together form a composite mesh reinforcement structure. This composite mesh reinforcement structure can disperse and transfer various stresses on the pump casing, making the overall stress on the pump casing more uniform, strengthening the overall structural strength and rigidity, preventing the pump casing from twisting and deforming due to uneven stress, improving the safety and stability of the pump casing, and also strengthening the strength at the liquid outlet port, ensuring the stable operation of the preheating pump under high temperature, high pressure, and high abrasion conditions.

[0016] Optionally, the stiffener support structure further includes multiple trapezoidal blocks, which are disposed between adjacent first vertical ribs and have connecting holes for embedding the pump body studs.

[0017] By adopting the above technical solution, when the pump body studs are tightened, the trapezoidal blocks can connect adjacent first vertical ribs into a whole, making the rib support structure more evenly stressed and avoiding stress concentration. At the same time, after the pump body studs are embedded, the connection between the front pump casing and the rear pump casing can be tighter, enhancing the overall strength of the pump casing sealing system and better withstanding the pressure and stress under the high temperature, high pressure and high abrasion conditions of the preheating pump. Furthermore, while considering strengthening the structural strength, the casting performance of the overall structure is also taken into account, avoiding casting defects caused by too many ribs.

[0018] Optionally, the inner ring of the imported sealing gasket is a conical structure and the outer ring is a rectangular structure, and the inner conical structure and the outer rectangular structure are coaxially arranged.

[0019] By adopting the above technical solution, the inner conical structure and the outer rectangular structure of the imported sealing gasket are coaxially arranged. The slurry enters from the inlet port, and the inner conical structure better adapts to the shape of the inlet port, guiding the slurry flow. The outer rectangular structure ensures a close fit with the surrounding structure of the inlet port. This allows the imported sealing gasket to fit more tightly with the inlet port during operation, resulting in more reliable sealing performance.

[0020] Optionally, the outlet sealing gasket adopts a trapezoidal structure combining an inner ring rubber and an outer ring 2205 duplex stainless steel skeleton, wherein the inner ring rubber portion is wider on the inside and narrower on the outside and is snapped into place with the 2205 duplex stainless steel skeleton.

[0021] By adopting the above technical solution, when the slurry flows from the volute to the outlet gasket, the rubber part can adapt to different pressures and shape changes by utilizing its own elasticity. The structure of being wider inside and narrower outside allows the rubber to better fit the sealing surface when under pressure, while the stainless steel skeleton provides a stable support structure, ensuring that the rubber part will not deform excessively or shift during the pressure process, thereby enhancing the overall strength, stability and sealing performance of the gasket.

[0022] Optionally, both the inlet gasket and the outlet gasket are made of modified fluororubber.

[0023] By adopting the above technical solution, the modified fluororubber has an operating temperature of ≥165℃, which can adapt to the working environment of high temperature and high pressure acid immersion medium transported by the preheating pump, ensuring the stable performance of the gasket under high temperature, high pressure and strong corrosion and abrasion conditions, thereby ensuring the normal operation of the entire preheating pump casing sealing system.

[0024] Optionally, a sealing rubber cord is provided between the front guard plate and the rear guard plate and the contact surface of the volute.

[0025] By adopting the above technical solution, when the preheating pump is running, the front and rear guard plates are in contact with the volute. The sealing rubber rope between the contact surfaces will fill the gaps in the contact surfaces. When the high-pressure acid immersion medium flows in the pump, the sealing rubber rope can prevent the medium from leaking from the contact surface, so that the medium flows in from the inlet port along a predetermined path, flows through the front guard plate, impeller, and volute, and finally is discharged from the outlet port, which enhances the sealing performance inside the pump casing and forms multiple sealing protections with the external sealing structure.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The stiffening plate support structure enhances the overall strength and rigidity of the structure, preventing torsional deformation caused by uneven stress; the clamping module fixes the shell and volute, strengthening the sealing between the front and rear pump shells; the entire pump shell sealing structure has high strength, good sealing performance, and high safety, making it suitable for high temperature, high pressure, and high abrasion conditions of preheating pumps. It can effectively avoid the failure of ordinary gaskets in high temperature, high pressure, and corrosive environments, and will not make the pump structure bulky like simply increasing the pump shell wall thickness, which is beneficial for installation and maintenance. 2. The clamping module can quickly and stably fix the housing and volute, enhance the sealing between the front pump housing and the rear pump housing, and prevent the components from loosening due to pressure or vibration. At the same time, the clamping force can be precisely controlled by the clamping stud and the locking nut to ensure the best sealing effect and prevent leakage of the high-pressure acid immersion medium delivered by the preheating pump. 3. The annular ribs, the first vertical rib, the horizontal ribs, and the second vertical rib together form a composite mesh reinforcement structure. This composite mesh reinforcement structure can disperse and transfer various stresses on the pump casing, making the overall stress on the pump casing more uniform, strengthening the overall structural strength and rigidity, preventing the pump casing from twisting and deforming due to uneven stress, improving the safety and stability of the pump casing, and also strengthening the strength at the liquid outlet port, ensuring the stable operation of the preheating pump under high temperature, high pressure, and high abrasion conditions. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the preheating pump casing sealing system in this application; Figure 2This is a cross-sectional view showing the preheating pump casing sealing system; Figure 3 This is a schematic diagram showing the structure of the clamping module; Figure 4 This is a schematic diagram showing the structure of the rear pump casing; Figure 5 This is a schematic diagram showing the structure of the imported sealing gasket; Figure 6 This is a schematic diagram showing the structure of the outlet sealing gasket; Figure 7 This is a structural diagram representing a stiffener-supported structure.

[0028] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Front pump housing; 111. Inlet port; 112. Inlet gasket; 1121. Conical structure; 1122. Rectangular structure; 12. Rear pump housing; 121. Arc-shaped notch; 13. Pump body stud; 14. Outlet port; 15. Outlet gasket; 151. Rubber part; 152. Stainless steel part; 2. Pump shaft; 21. Impeller; 22. Mechanical seal; 3. Front guard plate; 4. Rear guard plate; 5. Volute; 6. Rib support structure; 61. Annular rib; 62. First vertical rib; 63. Horizontal rib; 64. Second vertical rib; 65. Trapezoidal block; 651. Connecting hole; 7. Compression module; 71. Arc-shaped block; 72. Pressure plate; 73. Compression stud; 8. Sealing rope. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0030] This application discloses a preheating pump casing sealing system. (Refer to...) Figure 1 and Figure 2 The preheating pump casing sealing system includes a casing 1, a pump shaft 2, and an impeller 21. The casing 1 includes a front pump casing 11 and a rear pump casing 12, which are connected by pump body studs 13 to form a sealed cavity. During connection, the pump body studs 13 pass through corresponding threaded holes on the front and rear pump casings 11 and are tightened with nuts, ensuring a tight fit between the two casings and preventing media leakage. This also provides a stable working environment for the internal components. The pump shaft 2 is rotatably connected to the rear pump casing 12, and the impeller 21 is fixed to the end of the pump shaft 2. A mechanical seal 22 is provided between the pump shaft 2 and the rear pump casing 12, effectively preventing media leakage between them and ensuring the system's sealing performance.

[0031] Reference Figure 1 and Figure 2The front pump housing 11 is provided with an inlet port 111, and the housing 1 is provided with an outlet port 14 communicating with the inlet port 111. An inlet sealing gasket 112 and an outlet sealing gasket 15 are respectively fixed to the inlet port 111 and the outlet port 14. The inlet sealing gasket 112 and the outlet sealing gasket 15 are used to further enhance the sealing performance at the inlet and outlet of the preheating pump and prevent the medium from leaking at the inlet and outlet. A front guard plate 3 is provided inside the front pump housing 11, and a rear guard plate 4 is provided inside the rear pump housing 12. A volute 5 is provided between the front guard plate 3 and the rear guard plate 4. The volute 5 is fitted onto the outside of both the front guard plate 3 and the rear guard plate 4. The volute 5, the front guard plate 3, and the rear guard plate 4 together constitute the flow-through components of the pump, which guide and transport the medium. The outer side of the housing 1 is also provided with a stiffening support structure 6 to enhance the overall structural strength and rigidity. Between the front pump housing 11 and the rear pump housing 12, there is a clamping module 7 to fix the housing 1 and the volute 5 and enhance the sealing between the front pump housing 11 and the rear pump housing 12. The stiffening support structure 6 enhances the overall strength and rigidity of the housing 1 and prevents the housing 1 from deforming due to factors such as pressure and vibration. The clamping module 7 further improves the tightness and sealing between the front pump housing 11 and the rear pump housing 12.

[0032] When the preheating pump is working, the slurry enters from the inlet port 111, flows through the inlet gasket 112, the front guard plate 3, the impeller 21, and the volute 5, and finally exits from the outlet gasket 15. During this process, the pump shaft 2 is rotatably connected to the rear pump housing 12, and the impeller 21 is fixed to the end of the pump shaft 2 and rotates accordingly to realize the slurry transportation. The mechanical seal 22 between the pump shaft 2 and the rear pump housing 12, the inlet gasket 112 of the inlet port 111 and the outlet gasket 15 of the outlet port 14 constitute the first seal to prevent the slurry from leaking out. The front pump housing 11 and the rear pump housing 12 are connected by the pump body stud 13 to form a closed cavity, which constitutes the second seal to protect the internal flow components.

[0033] Specifically, refer to Figure 1 and Figure 3 Two clamping modules 7 are arranged along the axis of the inlet port 111, and the included angle between the two clamping modules 7 and the axis of the inlet port 111 is α, where 155°≤α≤165°. The clamping module 7 includes an arc-shaped block 71 fixed to the outside of the volute 5. The sides of the front pump housing 11 and the rear pump housing 12 that abut against each other are arranged in a plane. One side of the arc-shaped block 71 is also arranged in a plane parallel to the sides of the front pump housing 11 and the rear pump housing 12 that abut against each other. A pressure plate 72 is provided on one side of the plane of the arc-shaped block 71. A clamping stud 73 is fixed on the pressure plate 72. The end of the clamping stud 73 away from the pressure plate 72 passes through the rear pump housing 12 and is threaded with a locking nut. An arc-shaped notch 121 is opened on the rear pump housing 12. The pressure plate 72 is embedded in the arc-shaped notch 121 and locked to the arc-shaped block 71 on the volute 5 by the clamping stud 73.

[0034] Two clamping modules 7 are arranged along the axis of the liquid inlet port 111, and the included angle between them is within the range of 155°≤α≤165°. The two clamping modules 7 fasten the housing 1 and the volute 5 through their respective pressure plates 72, clamping studs 73 and locking nuts, so that when a clamping force is applied to the pump housing and the volute 5, the force can be evenly distributed in the corresponding parts of the pump housing, thereby reducing the risk of leakage caused by uneven pressure and improving the tightness and sealing of the connection between the front pump housing 11 and the rear pump housing 12. During installation, the plane of one side of the arc-shaped block 71 fixed to the outside of the volute 5 is kept parallel to the plane of the contact side of the front pump housing 11 and the rear pump housing 12. The pressure plate 72 is placed on one side of the plane of the arc-shaped block 71, so that the clamping stud 73 on the pressure plate 72 passes through the rear pump housing 12. Then, the locking nut is threaded onto the end of the clamping stud 73 away from the pressure plate 72. At the same time, an arc-shaped notch 121 is opened on the rear pump housing 12. The pressure plate 72 is embedded in the arc-shaped notch 121. By tightening the locking nut, the pressure plate 72 is locked to the arc-shaped block 71 on the volute 5 through the clamping stud 73. This makes it less likely for the housing 1 and the volute 5 to loosen due to pressure or vibration. At the same time, the clamping force can be precisely controlled by the cooperation of the clamping stud 73 and the locking nut to ensure that the sealing effect reaches the best state.

[0035] Specifically, refer to Figure 2 and Figure 4 Unlike previous designs with gaps, the front pump housing 11 and the rear pump housing 12 are designed with zero gaps. The contact side of the front pump housing 11 and the rear pump housing 12 is a reference machined surface that has been finely ground. The surface roughness of the reference machined surface Ra≤1μm. Fine grinding can make the contact surface of the front pump housing 11 and the rear pump housing 12 smoother and flatter, reduce the gap between them, and improve their fit. As a result, when the preheating pump is working, the high temperature and high pressure medium flowing in the pump is less likely to leak from the contact point, thus improving the sealing performance between the front pump housing 11 and the rear pump housing 12.

[0036] The zero-gap design between the front pump housing 11 and the rear pump housing 12 requires high machining precision. Therefore, during machining, the large plane A is machined first, and then the large plane B is machined with A as the reference to ensure the tolerance of dimension C. This ensures the "zero gap" and guarantees excellent sealing performance after the front pump housing 11 and the rear pump housing 12 are assembled with the zero-gap design.

[0037] Reference Figure 2 and Figure 3Sealing ropes 8 are provided between the front guard plate 3 and the rear guard plate 4 and the volute 5 respectively. The sealing ropes 8 between the front guard plate 3 and the rear guard plate 4 and the volute 5 fill the gaps in the contact surfaces. When the high-pressure acid immersion medium flows in the pump, the sealing ropes 8 can prevent the medium from leaking from the contact surfaces, so that the medium flows in from the inlet port 111 along a predetermined path, flows through the front guard plate 3, impeller 21, volute 5, and finally is discharged from the outlet port 14. The inlet sealing gasket 112, sealing ropes 8, mechanical seal 22 and outlet sealing gasket 15 constitute the first seal of the preheating pump, which can effectively prevent the slurry from leaking out.

[0038] Specifically, refer to Figure 2 , Figure 5 , Figure 6 The inner ring of the imported sealing gasket 112 is a conical structure 1121, and the outer ring is a rectangular structure 1122, with the inner conical structure 1121 and the outer rectangular structure 1122 coaxially arranged. The inner conical structure 1121 better adapts to the shape of the inlet port 111, guiding the slurry inflow, while the outer rectangular structure 1122 ensures a close fit with the surrounding structure of the inlet port 111. This allows the imported sealing gasket 112 to fit more tightly with the inlet port 111 during operation, resulting in more reliable sealing performance. The imported sealing gasket 112 is made of modified fluororubber material, which has excellent high-temperature resistance, high-pressure resistance, and corrosion resistance, enabling it to maintain good sealing performance for a long time in the high-pressure acid-impregnated medium transported by the preheating pump. The outlet sealing gasket 15 adopts a trapezoidal structure combining modified fluororubber and 2205 duplex stainless steel, including a rubber part 151 and a stainless steel part 152. The rubber part 151 is wider inside and narrower outside and is snapped into the stainless steel skeleton. When the slurry flows from the volute 5 to the outlet sealing gasket 15, the rubber part 151 can adapt to different pressure and shape changes by utilizing its own elasticity. The structure of being wider inside and narrower outside allows the rubber to better fit the sealing surface when under pressure. The stainless steel skeleton provides a stable support structure to ensure that the rubber part 151 will not deform excessively or shift during the pressure process, thereby enhancing the overall strength, stability and sealing performance of the sealing gasket.

[0039] Specifically, refer to Figure 7The stiffener support structure 6 includes an annular rib 61 fixed around the outer side of the pump casing axis, a first vertical rib 62 extending radially along the pump casing, multiple spaced horizontal ribs 63 fixed near the outlet port 14, and a second vertical rib 64 connecting the multiple horizontal ribs 63. The annular rib 61, the first vertical rib 62, the horizontal ribs 63, and the second vertical rib 64 form a composite mesh stiffener reinforcement structure. The annular rib 61 enhances the circumferential strength and rigidity of the pump casing, preventing deformation in the circumferential direction; the first vertical rib 62 extends radially along the pump casing, improving its radial strength and rigidity; the horizontal ribs 63 and the second vertical rib 64 form a mesh structure at the outlet port 14, further reinforcing the strength at the outlet and preventing damage to the outlet port 14 due to pressure and vibration. The stiffener support structure 6 also includes multiple trapezoidal blocks 65, which are positioned between adjacent first vertical ribs 62 and have connecting holes 651 for embedding pump body studs 13. When the pump body stud 13 is tightened, the trapezoidal block 65 can connect the adjacent first vertical ribs 62 into a whole, making the rib plate support structure 6 more evenly stressed and avoiding stress concentration.

[0040] The implementation principle of a preheating pump casing sealing system according to an embodiment of this application is as follows: When the preheating pump is working, the slurry enters from the inlet port 111, flows through the inlet sealing gasket 112, the front guard plate 3, the impeller 21, and the volute 5, and finally exits from the outlet sealing gasket 15. During this process, the pump shaft 2 is rotatably connected to the rear pump casing 12, and the impeller 21 is fixed to the end of the pump shaft 2 and rotates accordingly to realize slurry transportation. The mechanical seal 22 between the pump shaft 2 and the rear pump casing 12, the inlet sealing gasket 112 of the inlet port 111, and the outlet sealing gasket 15 of the outlet port 14 constitute the first seal to prevent slurry leakage. The front pump casing 11 and the rear pump casing 12 are connected by the pump body stud 13 to form a closed cavity, which constitutes the second seal to protect the internal flow components. This preheating pump casing sealing system effectively improves the strength and sealing performance of the pump casing by setting multiple sealing structures and stiffener support structures 6. The housing 1 is formed by connecting the front pump housing 11 and the rear pump housing 12 via pump body studs 13, creating a sealed cavity that provides a stable working environment for the internal components. The mechanical seal 22 between the pump shaft 2 and the rear pump housing 12 prevents leakage of the medium at the pump shaft 2. The special structural design and modified fluororubber material used in the inlet gasket 112 and outlet gasket 15 ensure sealing performance at the inlet and outlet. The combination of the front guard plate 3, the rear guard plate 4, and the volute 5 constitutes the pump's flow-through components, protecting the pump housing from wear and impact by the medium. The stiffening support structure 6 enhances the overall strength and rigidity of the housing 1, preventing deformation. The clamping module 7 further improves the tightness and sealing between the front pump housing 11 and the rear pump housing 12. The precision-ground reference surfaces on the contact sides of the front pump housing 11 and the rear pump housing 12 also enhance the sealing effect. Compared with previous technologies, this system overcomes the shortcomings of ordinary gaskets being prone to failure and simply increasing the pump casing wall thickness not being able to fundamentally solve the sealing problem. It has the advantages of high strength, good sealing performance, and high safety, and is very suitable for the high temperature, high pressure and high abrasion conditions of preheating pumps.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A preheating pump casing sealing system, characterized in that, It includes a housing (1), a pump shaft (2) and an impeller (21), wherein the housing (1) includes a front pump housing (11) and a rear pump housing (12), and the front pump housing (11) and the rear pump housing (12) are connected by a pump body stud (13) to form a sealed cavity; The pump shaft (2) is rotatably connected to the rear pump housing (12), the impeller (21) is fixed to the end of the pump shaft (2), and a mechanical seal (22) is provided between the pump shaft (2) and the rear pump housing (12); The front pump housing (11) is provided with an inlet port (111), and the housing (1) is provided with an outlet port (14) communicating with the inlet port (111). The inlet port (111) and the outlet port (14) are respectively fixed with an inlet sealing gasket (112) and an outlet sealing gasket (15). The front pump housing (11) is provided with a front guard plate (3), the rear pump housing (12) is provided with a rear guard plate (4), a volute (5) is provided between the front guard plate (3) and the rear guard plate (4), and the volute (5) is fitted onto the outside of both the front guard plate (3) and the rear guard plate (4). The outer side of the housing (1) is also provided with a stiffening plate support structure (6) for strengthening the overall structural strength and rigidity. A clamping module (7) is provided between the front pump housing (11) and the rear pump housing (12) for fixing the housing (1) and the volute (5) and strengthening the sealing between the front pump housing (11) and the rear pump housing (12).

2. The preheating pump casing sealing system according to claim 1, characterized in that, The clamping module (7) includes an arc-shaped block (71) fixed to the outside of the volute (5). The front pump housing (11) and the rear pump housing (12) are in a planar arrangement on their contact sides. One side of the arc-shaped block (71) is also in a planar arrangement parallel to the contact sides of the front pump housing (11) and the rear pump housing (12). A pressure plate (72) is provided on one side of the planar arrangement of the arc-shaped block (71). A clamping stud (73) is fixed on the pressure plate (72). The end of the clamping stud (73) away from the pressure plate (72) passes through the rear pump housing (12) and is threaded with a locking nut. The rear pump housing (12) has an arc-shaped groove (121), the pressure plate (72) is embedded in the arc-shaped groove (121) and locked to the arc-shaped block (71) on the volute (5) by the clamping stud (73).

3. The preheating pump casing sealing system according to claim 2, characterized in that, Two clamping modules (7) are arranged along the axis of the liquid inlet port (111), and the included angle between the two clamping modules (7) and the axis of the liquid inlet port (111) is α, 155°≤α≤165°.

4. The preheating pump casing sealing system according to claim 1, characterized in that, The contact side between the front pump housing (11) and the rear pump housing (12) is a reference machined surface that has been finely ground, and the surface roughness Ra of the reference machined surface is ≤1μm.

5. A preheating pump casing sealing system according to claim 1, characterized in that, The rib support structure (6) includes an annular rib (61) fixed around the outside of the pump casing axis, a first vertical rib (62) extending radially along the pump casing, a plurality of spaced horizontal ribs (63) fixed near the liquid outlet port (14), and a second vertical rib (64) connecting the plurality of horizontal ribs (63); the annular rib (61), the first vertical rib (62), the horizontal ribs (63), and the second vertical rib (64) form a composite mesh rib reinforcement structure.

6. A preheating pump casing sealing system according to claim 5, characterized in that, The rib support structure (6) also includes a plurality of trapezoidal blocks (65), which are located between adjacent first vertical ribs (62) and have connecting holes (651) for embedding the pump body studs (13).

7. A preheating pump casing sealing system according to claim 1, characterized in that, The inner ring of the imported sealing gasket (112) is a conical structure (1121), and the outer ring is a rectangular structure (1122), and the inner conical structure (1121) and the outer rectangular structure (1122) are coaxially arranged.

8. A preheating pump casing sealing system according to claim 7, characterized in that, The outlet sealing gasket (15) adopts a trapezoidal structure combining an inner rubber ring and an outer 2205 duplex stainless steel skeleton. The inner rubber ring (151) is wider inside and narrower outside and is snapped into the 2205 duplex stainless steel skeleton.

9. A preheating pump casing sealing system according to claim 8, characterized in that, Both the inlet gasket (112) and the outlet gasket (15) are made of modified fluororubber.

10. A preheating pump casing sealing system according to claim 1, characterized in that, Sealing ropes (8) are provided between the front guard plate (3) and the rear guard plate (4) and the contact surface of the volute (5).

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