Submerged advection plunger metering pump

Abstract

The utility model discloses a submerged advection plunger metering pump, and aims to provide the submerged advection plunger metering pump capable of ensuring that output feed liquid is stable and free of obvious fluctuation, and the technical scheme is characterized in that the submerged advection plunger metering pump comprises a pumping device and a power device for driving the pumping device to operate, the pumping device comprises a pump core assembly, an outer sleeve arranged outside the pump core assembly in a sleeving mode and a fluid end assembly arranged on the pump core assembly, the power device comprises a transmission end component arranged at one end of the pumping device and a driving motor for driving the transmission end component, and the pump core assembly comprises an upper inner barrel, a middle inner sleeve and a lower inner sleeve. The upper inner barrel, the middle inner sleeve and the lower inner sleeve are sequentially connected through bolts, and the fluid end assembly comprises a vertical pump head fixedly connected with the pump core assembly, plungers symmetrically arranged on the two sides of the pump core assembly and a lower outer sleeve arranged at one end of the vertical pump head. The plunger pump is suitable for the technical field of plunger pumps.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, and more specifically, to a submersible horizontal flow plunger metering pump. Background Technology

[0002] With the rapid development of my country's nuclear power industry, the demand for spent fuel reprocessing is increasing day by day, and the development needs of my country's reprocessing industry are very urgent. High-capacity reprocessing projects are the development trend.

[0003] Spent fuel reprocessing is a complex system engineering project. Based on the operational characteristics of the reprocessing plant and the specific requirements arising from the radioactive environment and media, the output liquid feed must be stable with minimal fluctuations. Shielding safety measures should be implemented as much as possible for fluid transport, and indirect or remote maintenance, replacement, transfer, and disposal of these equipment should be carried out. The transport of radioactive liquid feed has stringent requirements, and the installation and maintenance of transport equipment are highly challenging. Therefore, it is essential to strive for high reliability, aiming for maintenance-free or minimal maintenance, and easy maintenance throughout the plant's lifespan. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a submersible horizontal flow plunger metering pump that ensures stable output liquid without significant fluctuations.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a submersible horizontal flow plunger metering pump, comprising a pumping device and a power unit for driving the pumping device. The pumping device includes a pump core assembly, an outer sleeve sleeved outside the pump core assembly, and a hydraulic end assembly disposed on the pump core assembly. The power unit includes a transmission end component disposed at one end of the pumping device and a drive motor for driving the transmission end component. The pump core assembly includes an upper inner cylinder, a middle inner sleeve, and a lower inner sleeve, which are sequentially connected by bolts. The hydraulic end assembly includes a vertical pump head fixedly connected to the pump core assembly, plungers symmetrically disposed on both sides of the pump core assembly, and a lower outer sleeve disposed at one end of the vertical pump head. The lower outer sleeve has an inlet pipe at its top and an outlet pipe disposed on its side wall.

[0006] The present invention is further configured such that: the transmission end component includes a base detachably connected to the pump core assembly and a reduction mechanism disposed on the base; the reduction mechanism includes a worm gear disposed at the motor output end and a double eccentric wheel shaft that is connected to each plunger in a transmission; the outer wall of the double eccentric wheel shaft is provided with a turbine matching the worm gear.

[0007] The present invention is further configured such that: a connecting rod, a crosshead, and a power conversion mechanism are provided between the double eccentric wheel shaft and the plunger, and the power conversion mechanism is configured to convert the low-speed rotational motion of the worm gear into the reciprocating motion of the crosshead.

[0008] The present invention is further configured such that: the lower outer sleeve is provided with an inlet flange connected to the outlet pipe; the hydraulic end assembly also includes an inlet valve assembly symmetrically arranged on both sides of the inlet flange and an outlet valve assembly arranged at the bottom of the vertical pump head; the inlet valve assembly is provided with an inlet pressure cap for pressing the inlet valve assembly and the liquid guide channel; and the outlet valve assembly is provided with an outlet pressure cap for pressing the outlet valve assembly and the liquid guide channel.

[0009] The present invention is further configured such that: all the plungers are installed in a matching filling cavity in the vertical pump head, and each plunger in the filling cavity is fitted with an integrated plunger packing assembly. The integrated plunger packing assembly includes a first stuffing box, a guide sealing sleeve, a second stuffing box, and an upper guide compression sealing combination ring sequentially fitted on the outer wall of the plunger. The upper guide compression sealing combination ring sequentially includes a guide support ring, three V-shaped sealing rings, and a pressure ring.

[0010] The present invention is further configured such that: the pump core assembly is symmetrically provided with plunger assemblies on both sides, the plunger assembly includes a lower connecting rod fixed to both sides of the lower inner sleeve, an upper connecting rod disposed in the upper inner sleeve, and a transition connecting rod disposed between the lower connecting rod and the upper connecting rod, the transition connecting rod being connected to the lower connecting rod and the upper connecting rod respectively by means of a coupling, and the pump core assembly is fitted with upper and lower guide sleeves for guiding the plunger assembly.

[0011] The present invention is further configured such that: the plunger assembly is made of stainless steel, and the guide portions of the plunger assembly and the upper and lower connecting rods are coated with chromium oxide.

[0012] The beneficial effects of this utility model are:

[0013] 1. The pump core assembly is composed of an upper inner cylinder, a middle inner sleeve, and a lower inner sleeve, which are bolted together sequentially. This modular design facilitates manufacturing and maintenance while ensuring tight connections between components, resulting in a robust and reliable overall structure. It can adapt to complex working conditions, reducing the risk of loosening or damage due to vibration or impact during operation, and ensuring long-term stable operation of the metering pump. The hydraulic end assembly is equipped with a vertical pump head and symmetrically arranged plungers. This design ensures more balanced plunger movement and reasonable force distribution, effectively improving pumping efficiency and ensuring precise and stable fluid delivery. The pump core assembly is surrounded by an outer sleeve, and the hydraulic end assembly is also equipped with a lower outer sleeve. This multi-layered protective structure significantly reduces the risk of fluid leakage, prevents material contamination of the working environment, and ensures operator safety. The inlet pipe is located at the top of the lower outer sleeve, and the outlet pipe is located on the side wall. This layout allows for flexible adjustment of the connection method according to the on-site pipeline planning, enabling the metering pump to be better integrated into different process flow systems. It can achieve efficient adaptation without complex modifications, reducing installation costs and time. The drive motor and transmission end components work together to ensure precise and efficient power transmission. The pump's operating parameters can be flexibly adjusted according to actual working conditions, ensuring stable plunger movement rhythm, maintaining the stability of the metering pump's output flow and pressure, and improving the reliability and controllability of equipment operation.

[0014] 2. The base of the transmission component and the pump core assembly are detachably connected. This design allows for convenient and quick disassembly of the base when equipment malfunctions or requires regular maintenance, enabling inspection, repair, or replacement of key transmission components such as the reduction mechanism. The reduction mechanism utilizes a worm gear at the motor output end in conjunction with a turbine on the outer wall of the double eccentric wheel shaft. This worm gear transmission method offers advantages such as a large transmission ratio, compact structure, and smooth transmission. It accurately converts the high-speed rotation of the motor into a suitable low-speed rotation, providing a stable and appropriate power input for the subsequent stable operation of the plunger. This ensures precise and stable pumping action of the metering pump, contributing to accurate control of the fluid delivery volume. A connecting rod, crosshead, and power conversion mechanism are installed between the double eccentric wheel shaft and the plunger. This mechanism effectively converts the low-speed rotation of the worm gear into the reciprocating motion of the crosshead, which in turn drives the plunger to reciprocate, achieving fluid pumping. This ensures continuous and stable fluid delivery during the reciprocating motion, improving the accuracy and continuity of the metering pump's operation.

[0015] 3. The hydraulic end assembly also includes inlet valve assemblies symmetrically arranged on both sides of the inlet flange and outlet valve assemblies located at the bottom of the vertical pump head. The inlet and outlet valve assemblies are also equipped with matching inlet and outlet pressure caps. The inlet pressure cap serves to press the inlet valve assembly and the liquid guide channel, while the outlet pressure cap serves to press the outlet valve assembly and the liquid guide channel. The integrated plunger packing assembly includes a first stuffing box, a guide sealing sleeve, a second stuffing box, and an upper guide compression sealing combination ring, which are sequentially fitted onto the outer wall of the plunger. The use of the integrated plunger packing assembly improves the speed and convenience of maintenance, helps to enhance the sealing performance at the plunger, reduces liquid leakage, ensures the efficiency and operational stability of the plunger pump during operation, and reduces the probability of various problems caused by leakage. The upper guide compression sealing combination ring consists of three V-shaped sealing rings, a pressure ring, and a guide support ring. By pressing the packing pressure cap, the wear of the plunger and the sealing packing can be repaired.

[0016] 4. The lower connecting rod of the plunger assembly is fixed to both sides of the lower inner sleeve, and the upper connecting rod is set in the upper inner cylinder. The middle is connected by a coupling through a transition connecting rod. This multi-segment combination design facilitates processing and assembly, making the connection of the plunger assembly more stable and effectively reducing the shaking of the plunger during operation. In addition, the use of the coupling can buffer and adjust the force between the connecting parts to a certain extent, reducing the risk of damage to the parts due to uneven force. The inner cylinder is fitted with upper and lower guide sleeves for guiding the plunger assembly. The guide sleeves can ensure that the plunger moves along a precise straight trajectory during operation, reducing friction and wear between the plunger and other parts. The plunger assembly is made of stainless steel, which can resist the erosion of corrosive media that may be present in various working environments. It can effectively prevent the plunger assembly from rusting and corroding, thereby extending its service life and reducing the need for frequent replacement of parts due to material corrosion. In addition, the guide parts of the plunger assembly and the upper and lower connecting rods are coated with chromium oxide, which makes it both tough and has extremely high surface hardness and smoothness. It has good corrosion resistance and wear resistance, making the movement smoother and helping to maintain good fit between the components, ensuring the stable and efficient operation of the equipment for a long time. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the pump core assembly;

[0019] Figure 3 This is a sectional view of the power unit;

[0020] Figure 4 This is a cross-sectional view of the hydraulic end assembly;

[0021] Figure 5This is a cross-sectional view of the hydraulic end assembly from another direction.

[0022] Figure 6 A cross-sectional view of an integrated plunger packing assembly;

[0023] Figure 1-6 Reference numerals: 1. Pump core assembly; 2. Outer sleeve; 3. Hydraulic end assembly; 4. Transmission end component; 5. Drive motor; 6. Upper inner cylinder; 7. Middle inner sleeve; 8. Lower inner sleeve; 9. Vertical pump head; 10. Integrated plunger packing assembly; 11. Lower outer sleeve; 12. Inlet pipe; 13. Outlet pipe; 14. Base; 15. Worm gear; 16. Turbine; 17. Double eccentric wheel shaft; 18. Support ring; 19. Inlet flange; 20. Inlet valve assembly; 21. Outlet valve assembly; 22. Inlet pressure cap; 23. Outlet pressure cap; 24. Sealing ring; 25. First stuffing box; 26. Guide sealing sleeve; 27. Second stuffing box; 28. Lower connecting rod; 29. ​​Upper connecting rod; 30. Transition connecting rod; 31. Pressure ring. Detailed Implementation

[0024] Reference Figures 1 to 6 The embodiments of this utility model will be further described below.

[0025] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0027] Figures 1 to 6The illustrated submersible horizontal flow plunger metering pump includes a pumping device and a power unit for driving the pumping device. The pumping device includes a pump core assembly 1, an outer sleeve 2 fitted over the pump core assembly, and a hydraulic end assembly 3 mounted on the pump core assembly 1. The power unit includes a transmission end component 4 mounted at one end of the pumping device and a drive motor 5 driving the transmission end component 4. The drive motor 5 cooperates with the transmission end component 4 to ensure precise and efficient power transmission. It can flexibly adjust the pump's operating parameters according to actual working conditions, ensuring stable plunger movement rhythm, maintaining the stability of the metering pump's output flow rate and pressure, and improving the reliability and controllability of the equipment operation. Component 1 includes an upper inner cylinder 6, a middle inner sleeve 7, and a lower inner sleeve 8, which are sequentially connected by bolts. The hydraulic end component 3 includes a vertical pump head 9 fixedly connected to the pump core component 1, plungers symmetrically arranged on both sides of the pump core component 1, and a lower outer sleeve 112 located at one end of the vertical pump head 9. The lower outer sleeve 112 has an inlet pipe 12 at its top and an outlet pipe 13 located on its side wall. The pump core component 1 is equipped with an outer sleeve 2, and the hydraulic end component 3 is also equipped with a lower outer sleeve 112. This multi-layer protective structure significantly reduces the risk of fluid leakage, prevents material contamination of the working environment, and ensures the safety of operators. The inlet pipe 12 is located at the top of the lower outer sleeve 112, and the outlet pipe 13 is located on the side wall. This layout allows for flexible adjustment of the connection method according to the on-site pipeline planning, enabling the metering pump to be better integrated into different process flow systems. It can achieve efficient adaptation without complex modifications, reducing installation costs and time.

[0028] The transmission end component 4 includes a base 14 detachably connected to the pump core assembly 1 and a reduction mechanism mounted on the base 14. The reduction mechanism includes a worm gear 15 mounted at the motor output end and a double eccentric wheel shaft 17 that is connected to each plunger. The outer wall of the double eccentric wheel shaft 17 is provided with a turbine 16 that matches the worm gear 15. The base 14 of the transmission end component 4 is detachably connected to the pump core assembly 1. This design allows the base 14 to be easily and quickly disassembled when the equipment malfunctions or requires regular maintenance, so as to inspect, repair or replace key transmission components such as the reduction mechanism. In the reduction mechanism, the worm gear 15 at the motor output end cooperates with the turbine 16 on the outer wall of the double eccentric wheel shaft 17. This worm gear 15 transmission method has the advantages of large transmission ratio, compact structure and smooth transmission. It can accurately convert the high-speed rotation of the motor into a suitable low-speed rotation, providing a stable and suitable power input for the stable operation of the subsequent plungers, ensuring that the pumping action of the metering pump is accurate and rhythmic, and helping to accurately control the fluid delivery volume.

[0029] A connecting rod, a crosshead, and a power conversion mechanism are provided between the double eccentric wheel shaft 17 and the plunger. The power conversion mechanism can effectively convert the low-speed rotation of the worm gear into the reciprocating motion of the crosshead, thereby driving the plunger to reciprocate to achieve fluid pumping. This ensures that the plunger can continuously and stably transport fluid during the reciprocating motion, improving the accuracy and continuity of the metering pump. When plunger 1 is in the suction stroke, the pump chamber pressure drops, and the medium, under atmospheric pressure, opens the suction valve, allowing the medium to enter and fill the plunger's operating space (i.e., the pump chamber). When the plunger reaches the back dead center and transitions to the discharge stroke, the suction valve closes, the plunger continues to move forward, and when the pressure in the pump chamber rises and exceeds the process pressure, the discharge valve opens, allowing the medium to enter the process pipeline as the plunger continues to move forward, until the plunger reaches the front dead center and transitions back to the suction stroke. This alternation repeats continuously, allowing the medium to be continuously transported from a low position to a high position. The movement trajectory of plunger 2 is exactly the opposite; when plunger 1 is in the suction stroke, plunger 2 is in the discharge stroke, thus reducing the pulsation rate of the discharged medium.

[0030] The double eccentric wheel shaft 17 features a simple structure, high rigidity, and large force bearing capacity. The eccentric wheel has a large contact area with the connecting rod bushing, resulting in a high specific pressure value and wear resistance. The two cranks are arranged with a 180° phase angle offset, which facilitates smooth operation and reduces vibration. Due to the vertical structure, to prevent leakage of the crosshead seal and avoid environmental pollution, an oil baffle is used to collect the leaked lubricating oil for regular treatment. The two through holes on the plunger of the transmission box base 14, where the connecting rod 29 is installed, are fully utilized as mounting and positioning holes for the transmission end component 4, which better facilitates the requirements for quick disassembly and positioning during subsequent maintenance.

[0031] The hydraulic end assembly 3 also includes an inlet valve assembly 20 symmetrically arranged on both sides of the inlet flange 19 and an outlet valve assembly 21 arranged at the bottom of the vertical pump head 9. The inlet and outlet valve assemblies 21 are also equipped with matching inlet and outlet pressure caps 23. The inlet pressure cap 22 has the function of pressing the inlet valve assembly and the liquid guide channel, and the outlet pressure cap 23 has the function of pressing the outlet valve assembly and the liquid guide channel. The integrated plunger packing assembly 10 includes a first stuffing box 25, a guide sealing sleeve 26, a second stuffing box 27, and an upper guide compression sealing combination ring, which are sequentially sleeved on the outer wall of the plunger. The use of the integrated plunger packing assembly 10 improves the speed and convenience of maintenance, helps to enhance the sealing performance at the plunger, reduces liquid leakage, ensures the efficiency and operational stability of the plunger pump during operation, and reduces the probability of various problems caused by leakage. The upper guide compression sealing combination ring is composed of three V-shaped sealing rings 24, a pressure ring 31, and a guide support ring 18. The wear of the plunger and the sealing packing can be repaired by pressing the packing pressure cap.

[0032] Two perfluoroether rubber Y-rings are installed at the top and bottom of the first stuffing box 25, the guide sealing sleeve 26, and the second stuffing box 27. The inherent rubber elastomer generates elasticity, ensuring tight contact between the Y-ring and the plunger surface for sealing. This arrangement of two guide sealing rings ensures the straightness of the plunger movement, prevents uneven wear on the sealing packing, and improves the reliability and lifespan of the plunger seal. Built-in stainless steel V-springs and O-springs are also included. During pump operation, the flow pressure of the pumped liquid, the inherent rubber elastomer within the sealing ring, or the stainless steel spring generates elasticity, ensuring tight contact between the sealing ring and the plunger surface and the inner wall of the stuffing cavity for sealing. Furthermore, the built-in springs and the inherent rubber elastomer of the rubber sealing ring automatically compensate for and repair wear on the plunger and sealing packing. Multiple sealing structures are also installed on the outer sides of the first and second stuffing boxes and at the pressure cap opening, ensuring wear resistance, aging resistance, and corrosion resistance, further improving the reliability and lifespan of the plunger seal.

[0033] The lower connecting rod 28 of the plunger assembly is fixed to both sides of the lower inner sleeve 8, and the upper connecting rod 29 is set inside the upper inner cylinder 6. The middle is connected by a coupling through a transition connecting rod 30. This multi-segment combination design facilitates processing and assembly, making the connection of the plunger assembly more stable and effectively reducing the shaking of the plunger during operation. In addition, the use of the coupling can buffer and adjust the force between the connecting parts to a certain extent, reducing the risk of damage to the parts due to uneven force. The inner cylinder is fitted with upper and lower guide sleeves for guiding the plunger assembly. The guide sleeves can ensure that the plunger moves along a precise straight trajectory during operation, reducing friction and wear between the plunger and other parts.

[0034] The plunger assembly is made of stainless steel, which can resist the erosion of corrosive media that may be present in various working environments. It can effectively prevent the plunger assembly from rusting and corroding, thereby extending its service life and reducing the need for frequent replacement of parts due to material corrosion. In addition, the guide parts of the plunger assembly and the upper and lower connecting rods 28 are coated with chromium oxide, which makes it both tough and has extremely high surface hardness and smoothness. It has good corrosion resistance and wear resistance, making the movement smoother and helping to maintain good fit between the components, ensuring the stable and efficient operation of the equipment for a long time.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A submersible horizontal flow plunger metering pump, comprising a pumping device and a power unit for driving the pumping device, characterized in that, The pumping device includes a pump core assembly (1), an outer sleeve (2) sleeved outside the pump core assembly, and a hydraulic end assembly (3) disposed on the pump core assembly (1). The power device includes a transmission end component (4) disposed at one end of the pumping device and a drive motor (5) for driving the transmission end component (4). The pump core assembly (1) includes an upper inner cylinder (6), a middle inner sleeve (7), and a lower inner sleeve (8), and the upper inner cylinder (6), the middle inner sleeve (7), and the lower inner sleeve (8) are connected in sequence by bolts. The hydraulic end assembly (3) includes a vertical pump head (9) fixedly connected to the pump core assembly (1), plungers symmetrically disposed on both sides of the pump core assembly (1), and a lower outer sleeve (11)(2) disposed at one end of the vertical pump head (9). The lower outer sleeve (11)(2) has an inlet pipe (12) at its top and an outlet pipe (13) disposed on its side wall.

2. The submersible horizontal flow plunger metering pump according to claim 1, characterized in that, The transmission end component (4) includes a base (14) detachably connected to the pump core assembly (1) and a reduction mechanism provided on the base (14). The reduction mechanism includes a worm (15) provided at the motor output end and a double eccentric wheel shaft (17) that is connected to each plunger. The outer wall of the double eccentric wheel shaft (17) is provided with a turbine (16) that matches the worm (15).

3. The submersible horizontal flow plunger metering pump according to claim 2, characterized in that, The double eccentric wheel shaft (17) is provided with a connecting rod, a crosshead and a power conversion mechanism between it and the plunger. The power conversion mechanism is configured to convert the low-speed rotational motion of the worm gear into the reciprocating motion of the crosshead.

4. The submersible horizontal flow plunger metering pump according to claim 1, characterized in that, The lower outer sleeve (11)(2) is provided with an inlet flange (19) connected to the outlet pipe (13). The hydraulic end assembly (3) also includes an inlet valve assembly (20) symmetrically arranged on both sides of the inlet flange (19) and an outlet valve assembly (21) arranged at the bottom of the vertical pump head (9). The inlet valve assembly (20) is provided with an inlet cap (22) for pressing the inlet valve assembly (20) and the liquid guide channel. The outlet valve assembly (21) is provided with an outlet cap (23) for pressing the outlet valve assembly (21) and the liquid guide channel.

5. The submersible horizontal flow plunger metering pump according to claim 1, characterized in that, Both plungers are installed in the vertical pump head (9) and have a matching filling cavity. Each plunger in the filling cavity is fitted with an integrated plunger packing assembly (10). The integrated plunger packing assembly (10) includes a first stuffing box (25), a guide sealing sleeve (26), a second stuffing box (27), and an upper guide compression sealing ring, which are sequentially fitted on the outer wall of the plunger. The upper guide compression sealing ring includes a guide support ring (18), three V-shaped sealing rings (24), and a pressure ring (31).

6. The submersible horizontal flow plunger metering pump according to claim 1, characterized in that, The pump core assembly (1) is symmetrically provided with plunger assemblies on both sides. The plunger assembly includes a lower connecting rod (28) fixed on both sides of the lower inner sleeve (8), an upper connecting rod (29) disposed in the upper inner cylinder (6), and a transition connecting rod (30) disposed between the lower connecting rod (28) and the upper connecting rod (29). The transition connecting rod (30) is connected to the lower connecting rod (28) and the upper connecting rod (29) respectively by a coupling. The pump core assembly (1) is fitted with upper and lower guide sleeves for guiding the plunger assembly.

7. A submersible horizontal flow plunger metering pump according to claim 6, characterized in that, The plunger assembly is made of stainless steel, and the guide portions of the plunger assembly and the upper and lower connecting rods (28) are coated with chromium oxide.

Images