Multi-stage installation insertion and extension type three-screw pump unit

Abstract

The utility model discloses a multistage installation inserting and stretching type three-screw pump unit, which belongs to the technical field of positive displacement screw pumps and comprises a three-screw pump and a motor, the upper end face of the three-screw pump is connected with the lower end face of the motor through a connecting assembly, and the connecting assembly is composed of a frame plate and a connecting frame through fasteners. A middle shaft used for transmitting the torque of the motor to the three-screw pump is arranged in the connecting frame, an outlet of the three-screw pump is provided with a pipe pressing assembly through a clamping sleeve type butt welding joint, and the connecting frame comprises an upper end plate which is positioned with the three-screw pump through a spigot. The upper end plate located on the side of the pressing pipe assembly extends in the direction away from the motor and is provided with a first through hole, and the frame plate located on the side of the pressing pipe assembly extends in the direction away from the motor and is provided with a second through hole. Through the design of the multi-stage extension structure, the space layout is optimized, the adaptability and the practicability of the equipment are improved, and the application potential of the equipment under various complex working conditions is greatly enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of positive displacement screw pump technology, and particularly relates to a multi-stage installation and insertion type three screw pump unit. Background Technology

[0002] Currently, in numerous industrial sectors such as petrochemicals, metallurgy, power, steel, and machinery manufacturing, three-screw pump units play a crucial role in lubrication and cooling in various functional lubrication station systems, including hydraulic presses, machine tools, hydraulic support systems, rolling mills, and deep hole drills. These units are required to have lightweight design, convenient installation and maintenance processes, compact installation space requirements, leak-free sealing performance, low pressure pulsation characteristics, low noise operation, and high reliability.

[0003] Publication No. CN203686540U discloses a vertically suspended three-screw pump unit, including a plug-in three-screw pump, a motor, a connecting frame assembly, a coupling, an intermediate shaft, and a discharge pipe. This application represents a prior design by the applicant. However, in actual installation and use, due to the early completion of on-site civil construction, the space reserved for the three-screw pump unit is relatively limited. Existing vertically suspended three-screw pump units, due to structural limitations, lack the flexibility for disassembly and reassembly, thus failing to meet diverse on-site needs. Now, through experimental improvement and design optimization, the design concept has been gradually perfected, and a multi-stage plug-in three-screw pump unit is proposed to solve the above-mentioned technical problems. Summary of the Invention

[0004] In view of the problems existing in the prior art, this utility model provides a multi-stage installation and extension type three-screw pump unit. Through the multi-stage extension structure design, it not only optimizes the spatial layout and improves the adaptability and practicality of the equipment, but also greatly enhances its application potential under various complex working conditions.

[0005] This utility model is implemented as follows: a multi-stage installation insert-type three-screw pump unit includes a three-screw pump and an electric motor. The upper end face of the three-screw pump is connected to the lower end face of the electric motor through a connecting assembly. The connecting assembly is composed of a frame plate and a connecting bracket connected by fasteners. An intermediate shaft for transmitting the torque of the electric motor to the three-screw pump is provided inside the connecting bracket. A pressure tube assembly is installed at the outlet of the three-screw pump through a compression fitting butt welded joint. The connecting bracket includes an upper end plate that is positioned with the three-screw pump using a stop joint. The upper end plate located on the side of the pressure tube assembly extends away from the electric motor and is provided with a first through hole. The frame plate located on the side of the pressure tube assembly extends away from the electric motor and is provided with a second through hole.

[0006] The pressure tube assembly includes a first pressure tube and a second pressure tube arranged sequentially along the medium flow direction. The outlet end of the first pressure tube is connected to a second through hole through a first necked flat welded flange. The inlet end of the second pressure tube is connected to the second through hole through a second necked flat welded flange. The outlet end of the second pressure tube is connected to the first through hole through a third necked flat welded flange. A fourth necked flat welded flange connected to the first through hole is provided on the upper end face of the upper end plate.

[0007] Furthermore, the connecting frame also includes a central support plate and a lower end plate. The frame plate is fixed to the lower part of the central support plate by fasteners. A first bearing mounting seat is provided on the upper end surface of the central support plate, and the intermediate shaft is limited and rotated by a first deep groove ball bearing mounted on the first bearing seat. The lower end plate is connected to the upper end surface of the three-screw pump, and a second bearing mounting seat is provided on the upper end surface of the lower end plate. The drive screw of the three-screw pump is limited and rotated by a second deep groove ball bearing mounted on the second bearing seat. By employing two bearings working together, not only is excellent stability and support force provided, but also high positioning accuracy and reliability are ensured.

[0008] Furthermore, the three-screw pump is equipped with a pump inlet at its lower end, and a connecting pipe is provided at the pump inlet. A barrel-shaped filter is installed at the inlet end of the connecting pipe. The connecting pipe allows for easy assembly and disassembly according to on-site installation requirements, and standard and extended lengths can be selected to adapt to different working conditions. The barrel-shaped filter facilitates on-site maintenance, monitoring, and cleaning.

[0009] Furthermore, one end of the intermediate shaft is connected to the output shaft of the motor via a coupling, and the other end is connected to the drive screw of the three-screw pump via a coupling sleeve, wherein the coupling sleeve has an oil passage hole.

[0010] Furthermore, the coupling is a flexible coupling.

[0011] The advantages and technical effects of this utility model are as follows: By adopting the above technical solution and through the multi-level extension structure design, not only is the spatial layout optimized, but the adaptability and practicality of the equipment are also improved. Faced with complex and ever-changing working conditions, it can be quickly and accurately disassembled and adjusted according to the actual site conditions, greatly enhancing its application potential under various complex working conditions. Specifically, as follows:

[0012] 1. Under controllable weight and vibration conditions, the upper plate and frame form a two-stage connection structure, which not only optimizes structural strength and stability but also makes the assembly and disassembly process more efficient; the compression assembly adopts a two-stage structural design, which further enhances the system's flexibility and scalability, making the pipeline layout more reasonable. It not only meets the diverse connection needs on site but also facilitates subsequent assembly, disassembly, and maintenance; the multi-stage structural design can realize a variety of different installation modes to meet diverse on-site installation needs.

[0013] 2. The intermediate shaft adopts a two-section structure and uses dual bearing positioning, and its size can be adjusted according to site requirements;

[0014] 3. The pump inlet is equipped with a connecting pipe, which can be disassembled and assembled according to site requirements to achieve multi-stage installation modes with standard length and extended length;

[0015] 4. Replace the original internal filter plates with barrel-shaped filters, changing the internal structure to external assembly to facilitate on-site maintenance, observation and cleaning. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the pressure tube assembly structure provided in this embodiment of the utility model.

[0018] In the diagram: 1. Three-screw pump; 2. Electric motor; 3. Connecting frame; 3-1. Upper end plate; 3-2. First through hole; 3-3. Middle support plate; 3-4. Lower end plate; 4. Frame plate; 4-1. Second through hole; 5. Intermediate shaft; 6. Pressure tube assembly; 6-1. First pressure tube; 6-2. Second pressure tube; 6-3. First necked flat welded flange; 6-4. Second necked flat welded flange; 6-5. Third necked flat welded flange; 6-6. Fourth necked flat welded flange; 7. Connecting pipe; 8. Barrel filter; 9. Coupling; 10. Coupling sleeve. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0020] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] like Figure 1 and Figure 2As shown, this application provides a multi-stage, insert-type three-screw pump unit, including a three-screw pump 1 and a motor 2. The upper end face of the three-screw pump 1 is connected to the lower end face of the motor 2 via a connecting assembly. The connecting assembly consists of a frame plate 4 and a connecting frame 3 connected by fasteners. An intermediate shaft 5 for transmitting the torque of the motor 2 to the three-screw pump 1 is provided within the connecting frame 3. Specifically, the intermediate shaft 5 adopts a two-section structure. One end of the intermediate shaft 5 is connected to the output shaft of the motor via a coupling 9, and the other end is connected to the drive screw of the three-screw pump 1 via a coupling sleeve 10. The coupling sleeve 10 has an oil passage hole. Preferably, the coupling 9 is a flexible coupling 9. A pressure pipe assembly 6 is installed at the outlet of the three-screw pump 1 via a compression fitting welded joint.

[0022] The connecting frame 3 includes an upper end plate 3-1 positioned with the three-screw pump 1 by a stop. The upper end plate 3-1 located on the side of the pressure tube assembly 6 extends away from the motor 2 and is provided with a first through hole 3-2. The frame plate 4 located on the side of the pressure tube assembly 6 extends away from the motor 2 and is provided with a second through hole 4-1.

[0023] The pressure tube assembly 6 includes a first pressure tube 6-1 and a second pressure tube 6-2 arranged sequentially along the medium flow direction. The outlet end of the first pressure tube 6-1 is connected to the second through hole 4-1 through a first necked flat welding flange 6-3. The inlet end of the second pressure tube 6-2 is connected to the second through hole 4-1 through a second necked flat welding flange 6-4. The outlet end of the second pressure tube 6-2 is connected to the first through hole 3-2 through a third necked flat welding flange 6-5. The upper end face of the upper end plate 3-1 is provided with a fourth necked flat welding flange 6-6 that is connected to the first through hole 3-2.

[0024] Furthermore, the connecting frame 3 also includes a central support plate 3-3 and a lower end plate 3-4. The frame plate 4 is fixed below the central support plate 3-3 by fasteners. A first bearing mounting seat is provided on the upper end surface of the central support plate 3-3. The intermediate shaft 5 is limited and rotated by a first deep groove ball bearing mounted on the first bearing seat. The lower end plate 3-4 is connected to the upper end surface of the three-screw pump 1. A second bearing mounting seat is provided on the upper end surface of the lower end plate 3-4. The drive screw of the three-screw pump 1 is limited and rotated by a second deep groove ball bearing mounted on the second bearing seat. By employing two bearings working together, not only is excellent stability and support force provided, but also high positioning accuracy and reliability are ensured.

[0025] Furthermore, the three-screw pump 1 is provided with a pump inlet at its lower end, and a connecting pipe 7 is provided at the pump inlet. A barrel-shaped filter 8 is installed at the inlet end of the connecting pipe 7. The connecting pipe 7 can be disassembled and assembled according to on-site installation requirements, and standard length and extended length can be selected to adapt to different working conditions. The barrel-shaped filter 8 facilitates on-site maintenance, observation, and cleaning.

[0026] By adopting the above technical solution, the multi-level extension structure design not only optimizes the spatial layout and improves the adaptability and practicality of the equipment, but also greatly enhances its application potential under various complex working conditions.

[0027] With weight and vibration under control, the structural design of the connection components allows for disassembly and assembly based on the actual application at the customer's site. This not only optimizes structural strength and stability but also makes the disassembly and assembly process more efficient. The crimp assembly 6 adopts a two-stage structural design, further enhancing the system's flexibility and scalability. This results in a more rational pipeline layout, meeting diverse connection needs on-site and facilitating subsequent maintenance and upgrades.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-stage, insert-type three-screw pump unit, comprising a three-screw pump and a motor, wherein the upper end face of the three-screw pump is connected to the lower end face of the motor via a connecting assembly, the connecting assembly being composed of a frame plate and a connecting bracket via fasteners, an intermediate shaft for transmitting the motor torque to the three-screw pump is provided within the connecting bracket, and a pressure pipe assembly is installed at the outlet of the three-screw pump via a compression fitting welded joint, characterized in that: The connecting frame includes an upper end plate positioned with the three-screw pump by a stop, the upper end plate on the side of the pressure tube assembly extends away from the motor and is provided with a first through hole, and the frame plate on the side of the pressure tube assembly extends away from the motor and is provided with a second through hole. The pressure tube assembly includes a first pressure tube and a second pressure tube arranged sequentially along the medium flow direction. The outlet end of the first pressure tube is connected to a second through hole through a first necked flat welded flange. The inlet end of the second pressure tube is connected to the second through hole through a second necked flat welded flange. The outlet end of the second pressure tube is connected to the first through hole through a third necked flat welded flange. A fourth necked flat welded flange connected to the first through hole is provided on the upper end face of the upper end plate.

2. The multi-stage installation insert-type three-screw pump unit according to claim 1, characterized in that, The connecting frame also includes a middle support plate and a lower end plate. The frame plate is fixed to the lower part of the middle support plate by fasteners. The upper end surface of the middle support plate is provided with a first bearing mounting seat. The intermediate shaft is limited and rotated by a first deep groove ball bearing mounted on the first bearing seat. The lower end plate is connected to the upper end surface of the three-screw pump. The upper end surface of the lower end plate is provided with a second bearing mounting seat. The drive screw of the three-screw pump is limited and rotated by a second deep groove ball bearing mounted on the second bearing seat.

3. The multi-stage installation insert-type three-screw pump unit according to claim 1, characterized in that, The three-screw pump is provided with a pump inlet at its lower end, and a connecting pipe is provided at the pump inlet. A barrel-shaped filter is installed at the inlet end of the connecting pipe.

4. The multi-stage installation insert-type three-screw pump unit according to claim 1, characterized in that, One end of the intermediate shaft is connected to the output shaft of the motor via a coupling, and the other end is connected to the drive screw of the three-screw pump via a coupling sleeve. The coupling sleeve has an oil passage hole.

5. The multi-stage installation insert-type three-screw pump unit according to claim 4, characterized in that, The coupling is a flexible coupling.

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