A slurry pump for acetylene production discharge electrolytic residue

Abstract

The utility model relates to the technical field of slag slurry pump, specifically relates to a slag slurry pump for electrolytic residue of acetylene production, including support cylinder, be provided with the pump shaft in the support cylinder, the drive end side of pump shaft is driven by power element, the lower extreme of support cylinder is connected with the first intermediate spacer bushing, the second intermediate spacer bushing and gland that are in turn put on the non - drive end of pump shaft, the non - drive end of pump shaft is installed with first bearing, first skeleton oil seal in the first intermediate spacer bushing, the second bearing in the second intermediate spacer bushing and the second skeleton oil seal in the upper end flange of gland, the lower extreme of gland is connected with pump shell, the non - drive end of pump shaft passes out the gland and is installed with the impeller in the pump shell, the non - drive end of pump shaft still installs the third skeleton oil seal between the gland and pump shell. This slag slurry pump improves the stress condition at bearing, solves the problem that the life is short, frequent trouble of the equipment of this kind universally exists at present.

Description

Technical Field

[0001] This utility model relates to the technical field of slurry pumps, specifically to a slurry pump used for discharging electrolytic residues in acetylene production. Background Technology

[0002] The NL-type mud pump is used to transport the calcium carbide slurry, the residue from the acetylene production reaction of hydrolyzed calcium carbide. The working principle of this type of mud pump is to use an explosion-proof motor as a power source, which transmits power through a coupling to drive the long shaft and impeller to rotate. The resulting suction and centrifugal force from the impeller draw the slurry from the pit and transport it through pipelines to a specific storage location. During the media transportation process, the most significant characteristic of the pump body transporting slurry is that due to the high adhesiveness of the transported medium and its large particulate matter content, the specific working environment of the pump body and the characteristics of the transported medium cause the impeller to generate a strong centrifugal force, producing a large torque on the pump shaft.

[0003] During the operation of this type of pump, the non-drive end bearing, which is far from the coupling, often experiences angular displacement of the pump shaft due to centrifugal force generated when the impeller transports slurry. This results in a large torque. The large amount of particulate matter in the medium, along with the huge suction and centrifugal force generated by the running impeller, causes severe vibration. Together, these factors cause local stress and frequent impact forces on the bearing located on the pump body side, leading to the bearing being damaged in a very short time.

[0004] Through actual statistics and investigations, it has been found that the long shaft design of NL-type mud pumps and similar slurry pumps currently on the market often leads to shaft misalignment and deformation due to excessive centrifugal force during actual use. In the original design, only one bearing is typically installed on the pump body side to support the shaft and impeller for operation and positioning. Under this design condition, the single roller bearing located on the pump body side must withstand the combined effects of the strong torque generated by the outward deformation of the pump shaft and the frequent impacts from particles in the medium. This results in frequent bearing damage within a short period, and in severe cases, pump shaft deformation or even breakage. Under these design conditions and actual operating conditions, the actual service life of this type of pump is often only one to two months. Utility Model Content

[0005] The purpose of this invention is to provide a slurry pump for discharging electrolytic residue in acetylene production. This slurry pump solves the problems of short lifespan and frequent failures that are common in this type of equipment by improving the stress conditions at the bearing.

[0006] The technical solution of this utility model is as follows: a slurry pump for discharging electrolytic residue in acetylene production, comprising a support cylinder, a pump shaft disposed inside the support cylinder, the drive end of the pump shaft being driven by a power element, a first intermediate isolation sleeve, a second intermediate isolation sleeve and a pressure cap sequentially connected to the lower end of the support cylinder and sleeved on the non-drive end of the pump shaft, a first bearing, a first skeleton oil seal located in the first intermediate isolation sleeve, a second bearing located in the second intermediate isolation sleeve and a second skeleton oil seal located in the upper flange of the pressure cap being installed on the non-drive end of the pump shaft, a pump housing being connected to the lower end of the pressure cap, an impeller located in the pump housing being installed through the pressure cap on the non-drive end of the pump shaft, and a third skeleton oil seal located between the pressure cap and the pump housing being installed on the non-drive end of the pump shaft.

[0007] Furthermore, a third bearing located inside the support cylinder is installed on the drive end side of the pump shaft.

[0008] Furthermore, a retainer is installed at the upper end of the support cylinder, the power element is a motor and is installed at the upper end of the retainer, and the drive end of the pump shaft is connected to the output shaft of the motor via a coupling.

[0009] Furthermore, the upper side of the first intermediate isolation sleeve is provided with a first groove for cooperating with the flange face at the lower end of the support cylinder, the middle part of the upper side of the first intermediate isolation sleeve is provided with a first groove for installing the first skeleton oil seal, and the lower side of the first intermediate isolation sleeve is provided with a first boss.

[0010] Furthermore, the upper side of the second intermediate isolation sleeve is provided with a second groove for cooperating with the first boss, the second bearing is disposed in the second groove, the lower side of the second intermediate isolation sleeve is provided with a second boss, and the second boss cooperates with a third groove disposed in the upper flange of the gland.

[0011] Furthermore, the upper flange of the gland is provided with a second groove for installing a second skeleton oil seal, and a pair of second skeleton oil seals are installed in the second groove.

[0012] Furthermore, rubber gaskets for sealing are provided between the lower flange of the support cylinder and the first intermediate isolation sleeve, between the first intermediate isolation sleeve and the second intermediate isolation sleeve, and between the second intermediate isolation sleeve and the upper flange of the gland.

[0013] Furthermore, sealing water lines are machined on both contact surfaces of the first intermediate isolation sleeve and the second intermediate isolation sleeve; bearing supports for positioning and support during pump shaft reinstallation are machined on the inside of both ends of the support cylinder.

[0014] Furthermore, the lower flange of the gland is provided with a fourth groove for installing the third skeleton oil seal, and the upper side of the impeller is provided with a positioning flange for penetrating the fourth groove and abutting against the third skeleton oil seal.

[0015] Furthermore, a pump inlet front screen is installed at the water inlet at the lower end of the pump casing.

[0016] Compared with the prior art, the present invention has the following advantages: 1. This slurry pump solves the problems of short lifespan and frequent failures that are common in this type of equipment by improving the stress conditions at the bearing.

[0017] 2. This slurry pump significantly extends the lifespan of components such as sealing assemblies, bearings, and pump shafts. Through structural optimization and improvement, adding a bearing greatly reduces the force on the non-drive end bearing located on the pump body side, resulting in smoother pump operation. Structural optimization of the pump shaft, support cylinder, intermediate body, and bearings alters the pump's natural frequency and critical speed during operation. With current motor frequency, current, and voltage parameters remaining constant, the operating speed differs from the critical speed, thus preventing resonance during pump operation and significantly reducing vibration. Through optimized equipment structure and installation design, the bearing lifespan is extended from one to two months to six months in actual use. Reduced vibration leads to smoother equipment operation, lower leakage rates, and a substantial increase and extension of the mechanical seal's lifespan and replacement cycle.

[0018] 3. This slurry pump is designed for vertical installation; therefore, all parts and components are installed and used in the same way as a typical NL-type mud pump, with no special requirements. The overall dimensions of this slurry pump are the same as the original NL-type pump, and no modifications to its position or supports are necessary during actual use.

[0019] 4. This slurry pump is based on the original pump, with the addition of bearings, intermediate isolation sleeves and skeleton oil seals, etc., making the overall structure more stable and the equipment run more smoothly during actual use and operation; the added bearings, skeleton oil seals and other components are original parts, without the need for additional customization, and have a strong substitutability.

[0020] 5. The actual dimensions of each intermediate isolation sleeve should be referenced from the dimensions of the support cylinder, pump shaft, bearing and skeleton oil seal. Since the above components are standard parts, the fit error is small and the equipment is highly replaceable. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an existing slurry pump; Figure 2 This is a schematic diagram of the slurry pump structure of this utility model; Figure 3 This is a partial enlarged view of the slurry pump of this utility model; In the diagram: 1. Motor, 2. Cage, 3. Third bearing, 4. Support cylinder, 4a. Lower flange of support cylinder, 5. Second skeleton oil seal, 6. Impeller, 61. Positioning flange, 7. Pump outlet flange, 8. Pump casing, 9. Pump inlet front end screen, 10. Coupling, 11. Pump shaft, 12. First bearing, 13. First skeleton oil seal, 14. First intermediate isolation sleeve, 141. First groove, 142. First boss, 15. Second bearing, 16. Second intermediate isolation sleeve, 161. Second groove, 162. Second boss, 17. Second skeleton oil seal, 18. Gland, 18a. Upper flange of gland, 18b. Lower flange of gland, 181. Third groove, 182. Second groove, 183. Fourth groove, 19. Locking nut. Detailed Implementation

[0022] To make the above-mentioned features and advantages of this utility model more easily understood, specific embodiments are described below in conjunction with the accompanying drawings, but this utility model is not limited thereto.

[0023] refer to Figure 2 and Figure 3 A slurry pump for discharging electrolytic residue in acetylene production includes a support cylinder 4. A pump shaft 11 is housed within the support cylinder 4. The drive end of the pump shaft 11 is driven by a power element. A third bearing 3 is installed on the drive end of the pump shaft within the support cylinder. The lower end of the support cylinder 4 is sequentially connected to a first intermediate isolation sleeve 14, a second intermediate isolation sleeve 16, and a pressure cap 18, all fitted onto the non-drive end of the pump shaft 11. The non-drive end of the pump shaft 11 is equipped with a first bearing 12, a first skeleton oil seal 13 located within the first intermediate isolation sleeve 14, a second bearing 15 located within the second intermediate isolation sleeve 16, and a second skeleton oil seal 17 located within the upper flange of the pressure cap 18. The first bearing 12 is located within the support cylinder. A pump housing 8 is connected to the lower end of the pressure cap 18. An impeller 6 is installed on the non-drive end of the pump shaft 11, extending through the pressure cap 18 and housed within the pump housing 8. A third skeleton oil seal 5 is also installed on the non-drive end of the pump shaft 11, located between the pressure cap 18 and the pump housing 8.

[0024] In this embodiment, in order to drive the pump shaft to rotate, a retainer 2 is installed at the upper end of the support cylinder 4, the power element is a motor 1 and is installed at the upper end of the retainer 4, and the drive end of the pump shaft 11 is connected to the output shaft of the motor 1 via a coupling 10.

[0025] In this embodiment, the upper side of the first intermediate isolation sleeve 14 is provided with a first groove for mating with the flange face of the lower end of the support cylinder 4. The upper middle part of the first intermediate isolation sleeve 14 is provided with a first groove 141 for installing the first skeleton oil seal 13 and is machined with a through hole. The minimum inner diameter of the through hole is 4mm larger than the mating diameter of the pump shaft 11 to avoid the pump shaft 11 from unstable collision failure during operation. The lower side of the first intermediate isolation sleeve 14 is provided with a first boss 142.

[0026] In this embodiment, the upper side of the second intermediate isolation sleeve 16 is provided with a second groove 161 for cooperating with the first boss 142, and the second bearing 15 is disposed in the second groove 161 and located at the center of the second intermediate isolation sleeve 16. The lower side of the second intermediate isolation sleeve 16 is provided with a second boss 162, which cooperates with a third groove 181 disposed in the upper flange of the pressure cover 18.

[0027] In this embodiment, the upper flange of the pressure cap 18 is provided with a second groove 182 for installing a second skeleton oil seal 17, and a pair of second skeleton oil seals 17 are installed in the second groove 182.

[0028] In this embodiment, rubber gaskets for sealing are provided between the lower flange of the support cylinder 4 and the first intermediate isolation sleeve 14, between the first intermediate isolation sleeve 14 and the second intermediate isolation sleeve 16, and between the second intermediate isolation sleeve 16 and the upper flange of the cover 18, so as to seal the mating surfaces.

[0029] In this embodiment, sealing water lines are machined on both contact surfaces of the first intermediate isolation sleeve 14 and the second intermediate isolation sleeve 16 to enhance and improve the sealing effect between the contact surfaces and the rubber gasket. Bearing supports for positioning and support during the reinstallation of the pump shaft (including the bearing) are machined inside both ends of the support cylinder 4.

[0030] In this embodiment, the lower flange of the pressure cap 18 is provided with a fourth groove 183 for installing the third skeleton oil seal 5, the lower end of the pump shaft 11 is provided with a threaded part, the impeller 6 is locked to the lower end of the pump shaft 11 by locking nuts 19 and other components such as locking plates, and the upper side of the impeller 6 is provided with a positioning flange 61 for penetrating the fourth groove 183 and abutting against the third skeleton oil seal.

[0031] In this embodiment, a pump inlet front screen 9 is installed at the water inlet at the lower end of the pump casing 8, and a pump outlet flange 7 is provided at the water outlet on the side of the pump casing 8.

[0032] In this embodiment, the modification details of the slurry pump are as follows: 1. Pump shaft: By changing the length of the bearing mating position at the non-drive end, the positions of the bearing, skeleton oil seal and intermediate spacer are increased for the overall assembly of the pump; the overall structure of the pump shaft is not significantly modified and the stress condition of the main shaft is not changed, so it can better adapt to the actual use environment.

[0033] 2. Support cylinder: Modify the existing support cylinder 4 in conjunction with the bearing dimensions, shorten the length of the support cylinder by 1:1, and do not change its mating surface or the diameter of the support cylinder.

[0034] 3. Bearings, oil seals, and rubber gaskets: The new bearings, oil seals, and rubber gaskets are identical in model, size, and material to the original pump and require no special treatment.

[0035] 4. Intermediate Isolation Sleeves: When machining the first intermediate isolation sleeve 14 and the second intermediate isolation sleeve 16, 20mm thick plates of 20# steel are selected. The outer diameter of the isolation sleeve is taken as the outer diameter of the lower flange of the support cylinder 4, and the plates are machined into a disc shape. Two pieces of the machined material are selected: one piece is used to machine the bearing support (161) for installing the second bearing 15, and the other piece is used to machine the first groove 141 of the first skeleton oil seal 13, thereby installing and fixing the first skeleton oil seal 13 and the second bearing 15. The minimum inner diameter of the center hole of the material used to machine the first groove 141 is increased by 4mm based on the matching diameter of the pump shaft 11 to avoid wear between the pump shaft 11 and the first intermediate isolation sleeve 14 due to swing during actual operation. Since the bearings, skeleton oil seals, and other components are standard parts, after the first intermediate isolation sleeve 14 and the second intermediate isolation sleeve 16 are machined, they can be directly matched with other pumps of the same type and used as spare parts for replacement, which can greatly reduce machining costs and operating and maintenance costs.

[0036] The general installation method and sequence of this slurry pump can refer to the installation method and sequence of similar pumps. That is, the motor 1 is the driving device of the equipment. The power is transmitted to the pump shaft 11 through the coupling 10 to drive the impeller 6 to throw out the slurry. The retainer 2 is used for the connection and fixation between the motor 1 and the support cylinder 4 to stabilize the smooth operation of the pump.

[0037] Pump body side installation: After cleaning and maintenance, place all components at the installation station. Install the third bearing 3 on the drive end side of the pump shaft 11, then reinstall it onto the support cylinder 4. Then, install the assembled pump shaft 11 on the non-drive end side in the following sequence: first bearing 12, first intermediate isolation sleeve 14, first skeleton oil seal 13, second bearing 15, second intermediate isolation sleeve 16, second skeleton oil seal 17, and gland 18. During this installation process, install the first bearing 12, second bearing 15, first skeleton oil seal 13, and second skeleton oil seal 17 in their corresponding bearing supports and oil seal grooves, and install rubber gaskets between each mating surface for sealing. Adjust the fit between each component, and after ensuring smooth and normal rotation of the pump shaft 11, tighten the assembled components with fixing bolts and nuts. Install the third skeleton oil seal 5 and impeller 6, tighten the locking nut 19 and fix the locking plate; reinstall the installed pump body onto the pump casing 8 with the inlet front screen 9, tighten the bolts and fasteners and perform a second rotation.

[0038] After confirming the installation is complete and without abnormalities, place the installed pump at the workstation. Perform a preliminary test run on the entire system and surrounding environment, ensuring no abnormalities are found. Once the motor rotation is confirmed to be correct, restart motor 1 and begin pumping the medium. Continuously monitor the pump's vibration, temperature, pressure, flow rate, current, and other operating parameters for two hours. Combine this with on-site observation of the actual operating conditions, listening for any abnormal noises, and checking all contact surfaces for potential leaks or other faults. Once the equipment is running stably, it can be officially put into normal operation. Based on actual on-site operation, the service life of the modified pump can be extended from one to two months to more than six months, significantly reducing equipment operation and maintenance costs and production costs, and greatly improving the feasibility of stable, long-term operation of the equipment.

[0039] In this utility model, the terms "first" and "second" are used to define the components. Those skilled in the art should know that the use of "first" and "second" is merely for the purpose of distinguishing the components in the description. Unless otherwise stated, the above terms have no special meaning.

[0040] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting or welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0041] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0042] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0043] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A slurry pump for discharging electrolytic residue in acetylene production, comprising a support cylinder, characterized in that, A pump shaft is installed inside the support cylinder. The driving end of the pump shaft is driven by a power element. The lower end of the support cylinder is sequentially connected to a first intermediate isolation sleeve, a second intermediate isolation sleeve, and a pressure cover, which are fitted onto the non-driving end of the pump shaft. A first bearing, a first skeleton oil seal located in the first intermediate isolation sleeve, a second bearing located in the second intermediate isolation sleeve, and a second skeleton oil seal located in the upper flange of the pressure cover are installed on the non-driving end of the pump shaft. The lower end of the pressure cover is connected to a pump housing. An impeller located in the pump housing is installed through the pressure cover at the non-driving end of the pump shaft. A third skeleton oil seal located between the pressure cover and the pump housing is also installed on the non-driving end of the pump shaft.

2. A slurry pump for discharging electrolytic residue in acetylene production according to claim 1, characterized in that, A third bearing is installed on the drive end side of the pump shaft, located inside the support cylinder.

3. A slurry pump for discharging electrolytic residue in acetylene production according to claim 1 or 2, characterized in that, A retainer is installed at the upper end of the support cylinder, and the power element is a motor installed at the upper end of the retainer. The drive end of the pump shaft is connected to the output shaft of the motor via a coupling.

4. A slurry pump for discharging electrolytic residue in acetylene production according to claim 1, characterized in that, The upper side of the first intermediate isolation sleeve is provided with a first groove for cooperating with the flange face at the lower end of the support cylinder, the middle part of the upper side of the first intermediate isolation sleeve is provided with a first groove for installing the first skeleton oil seal, and the lower side of the first intermediate isolation sleeve is provided with a first boss.

5. A slurry pump for discharging electrolytic residue in acetylene production according to claim 4, characterized in that, The upper side of the second intermediate isolation sleeve is provided with a second groove for cooperating with the first boss, the second bearing is disposed in the second groove, the lower side of the second intermediate isolation sleeve is provided with a second boss, and the second boss cooperates with a third groove disposed in the upper flange of the gland.

6. A slurry pump for discharging electrolytic residue in acetylene production according to claim 1, 4, or 5, characterized in that, The upper flange of the gland is provided with a second groove for installing a second skeleton oil seal, and a pair of second skeleton oil seals are installed in the second groove.

7. A slurry pump for discharging electrolytic residue in acetylene production according to claim 1, characterized in that, Rubber gaskets for sealing are provided between the lower flange of the support cylinder and the first intermediate isolation sleeve, between the first intermediate isolation sleeve and the second intermediate isolation sleeve, and between the second intermediate isolation sleeve and the upper flange of the gland.

8. A slurry pump for discharging electrolytic residue in acetylene production according to claim 1 or 7, characterized in that, Both contact surfaces of the first intermediate isolation sleeve and the second intermediate isolation sleeve are machined with sealing water lines; the two ends of the support cylinder are machined with bearing supports for positioning and support when reinstalling the pump shaft.

9. A slurry pump for discharging electrolytic residue in acetylene production according to claim 1, characterized in that, The lower flange of the gland is provided with a fourth groove for installing the third skeleton oil seal, and the upper side of the impeller is provided with a positioning flange for penetrating the fourth groove and abutting against the third skeleton oil seal.

10. A slurry pump for discharging electrolytic residue in acetylene production according to claim 1, characterized in that, The pump inlet is equipped with a front screen cover at the lower end of the pump casing.

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