High-strength anti-radiation submerged advection plunger metering pump and processing method thereof

Abstract

The invention discloses a pump body device, and aims to provide a high-strength anti-radiation submerged advection plunger metering pump which is convenient to install and maintain, high in stability of medium conveying and high in structural strength and a machining method of the high-strength anti-radiation submerged advection plunger metering pump. The low-speed rotating motion of the power motor is converted into the reciprocating motion of the connecting rod, a double-eccentric-wheel structure is adopted, the whole structure is simple, the rigid strength is high, large force can be borne in the operation process, the stability of the machining structure of the metering pump is guaranteed, and the conveying amount of fluid can be accurately controlled; according to the plunger metering pump, the pulsation rate of medium discharging can be reduced in the conveying process of the metering pump, and the plunger metering pump is suitable for the technical field of plunger metering pumps.

Description

Technical Field

[0001] The present invention relates to a pump body device, and more specifically, to a submersible horizontal piston metering pump with high strength and radiation protection and a processing method thereof. Background Art

[0003] The spent fuel reprocessing project is a systematic project. According to the operating characteristics of the reprocessing project and the special requirements generated by the radioactive environment and medium, the output feed liquid is stable and has no obvious fluctuations. Shielding safety measures should be taken as much as possible for fluid transportation, and indirect or remote maintenance and replacement methods, transportation, and disposal of these devices should be adopted. The transportation requirements of radioactive feed liquid are harsh, and operations such as installation and maintenance of transportation equipment are very difficult. Therefore, it is necessary to strive for high reliability, with little or no maintenance and easy maintenance during the service life of the plant.

[0004] At present, the submersible pumps on the market usually adopt a single plunger drive, and the transportation of the medium is realized by the reciprocating movement of a single plunger in the submersible pump. However, during the transportation of the medium, the plunger has a suction stroke and a discharge stroke, resulting in a large pulsation rate of the medium discharge during the operation of the submersible pump, low stability of the medium transportation, and poor practicability. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a submersible horizontal piston metering pump with high strength and radiation protection, which is convenient for installation and maintenance, has high stability in transporting the medium, and has high structural strength, and a processing method thereof.

[0006] To achieve the above object, the present invention provides the following technical solutions: A submersible horizontal piston metering pump with high strength and radiation protection, including a power motor, a worm is provided at the bottom of the power motor, and further includes a power end: the power end is arranged at the bottom of the power motor and is in transmission connection with the worm of the power motor, a plunger rod is provided at the bottom of the power end, and the power end is used to receive and transmit the control signal of the power motor;

[0007] Pump core: The pump core is arranged at the bottom of the power end. An inner cylinder is provided in the pump core. The inner cylinder includes an inner upper cylinder, an inner middle sleeve, and an inner lower sleeve, and the inner upper cylinder, the inner middle sleeve, and the inner lower sleeve are connected by bolts;

[0008] Hydraulic end: The hydraulic end is arranged on the side of the pump core away from the power end. The hydraulic end includes a pump head fixedly connected to the inner cylinder and an outer sleeve arranged at the bottom of the pump head. An inlet pipe is further provided at the bottom of the outer sleeve, and an outlet pipe is provided on the side wall of the outer sleeve.

[0009] The present invention is further configured such that: an installation base is further provided at the bottom of the power end, a speed reduction device is provided on the installation base, and the speed reduction device includes a transmission worm wheel disposed within the power end, transmission shafts disposed at both ends of the transmission worm wheel, and bearing covers disposed on the transmission shafts.

[0010] Preferably, eccentric wheels are provided on the transmission shafts at both ends of the worm, and the phase angle difference between the two eccentric wheels is 180°. A connecting rod is provided at the bottom of the eccentric wheel, the connecting rod is rotatably connected to the eccentric wheel, a crosshead pin is provided at the bottom of the connecting rod, and the connecting rod is rotatably connected to the plunger rod through the crosshead pin.

[0011] The present invention is further configured such that: connecting rods are provided on both sides of the inner cylinder body, the connecting rods are fixedly connected to the connecting rod, the connecting rod has fixing portions provided at both ends thereof and a transition portion provided between the fixing portions, and both ends of the transition portion are rotatably connected to the fixing portions.

[0012] The present invention is further configured such that: a fastening flange is provided between the outer sleeve of the hydraulic end and the pump head. One end of the fastening flange extends into the inlet pipe of the outer sleeve and abuts against the inner wall of the inlet pipe, and the other end abuts against the pump head to form a cavity between the pump head and the outer sleeve, and the position of the cavity matches the position of the outlet pipe.

[0013] Preferably, a material passage is further provided in the pump head, a packing device is provided in the material passage, the packing device includes a stuffing box sleeve disposed on the inner wall of the material passage, the fixing portion of the connecting rod is inserted into the stuffing box sleeve and a sealing structure is provided between the fixing portion of the connecting rod and the stuffing box sleeve. A connecting passage is further provided at the bottom of the pump head, and the connecting passage is used to connect the material passage in the pump head and the outlet pipe. The material of the sealing structure is one of radiation-resistant FEP or perfluoroether rubber.

[0014] Preferably, inlet and outlet valves are further provided in the plunger passage, and the inlet and outlet valves include an outlet gland provided at the outlet of the plunger passage, a valve member provided in the plunger passage, and a valve ball provided in the valve member.

[0015] The present application also provides a processing method for a high-strength radiation-proof submersible horizontal plunger metering pump, including the following steps: S11. Connect a worm to the bottom of the power motor, and at the same time insert the power motor connected with the worm into the power end, so that the worm wheel in the power end matches the worm at the bottom of the power motor;

[0016] S12. Insert a transmission shaft into the worm wheel, and at the same time install eccentric wheels at both ends of the worm wheel, so that the phase angle difference between the eccentric wheels at both ends of the worm wheel is 180°;

[0017] S13. Install a plunger rod at the bottom of the eccentric wheel, start the power motor, and make the movement directions of the plunger rods corresponding to the two eccentric wheels opposite to each other;

[0018] S14. After the installation at the power end is completed, assemble the inner upper cylinder, inner middle sleeve, and inner lower sleeve of the inner cylinder of the pump core, and connect them with bolts at the joints. After the connection is completed, detect the accuracy of the inner cylinder of the pump core to ensure that the dimensional accuracy, concentricity, and position accuracy meet the requirements;

[0019] S15. Assemble the connecting rod so that the fixing part and the transition part are connected to each other, and detect the accuracy of the connecting rod after the assembly is completed to make it meet the requirements;

[0020] S16. Assemble the completed pump core and the connecting rod into the power end so that the power end and the power motor guide the pump core;

[0021] S17. Assemble the pump head for installation. Specifically, an inlet and outlet valve needs to be installed at one end of the material channel in the pump head, and a packing device needs to be installed at the other end of the material channel;

[0022] S18. Install an outlet pipe at the bottom of the outer sleeve, and install a fastening flange on the inner bottom surface of the outer sleeve corresponding to the position of the outlet pipe;

[0023] S19. Install the pump head into the inner part of the outer sleeve. During the installation process, make the inlet and outlet valve in the pump head close to the inner bottom surface of the outer sleeve and make the connecting channel in the pump head communicate with the outlet pipe to form a hydraulic end;

[0024] S20. After the assembly of the hydraulic end is completed, install the hydraulic end at the bottom of the pump core and make the material channel of the pump head in the hydraulic end match the connecting rod of the pump core.

[0025] Preferably, the processing method further includes a detection method for the finished metering pump. The detection method includes the following steps: S21. Start the power motor to drive the worm at the bottom of the power motor to rotate, and at the same time, the worm drives the driving worm gear connected to it to rotate;

[0026] S22. When the driving worm gear rotates, the drive shafts at both ends of the driving worm gear rotate synchronously, so that the eccentric wheels on the drive shafts rotate;

[0027] S23. During the rotation of the eccentric wheels, detect the movement states of the plunger rods corresponding to the two eccentric wheels. If the movement direction of the first plunger rod is the suction stroke away from the inlet pipe, jump to S4 for detection. Otherwise, if the movement direction of the first plunger rod is the discharge stroke close to the inlet pipe, jump to S5 for detection;

[0028] S24. Detect the movement direction of the second plunger rod. If the second plunger rod is also in the suction stroke with the movement direction away from the inlet pipe, it is determined that the movement directions of the current second plunger rod and the first plunger rod are the same, the pulsation rate during medium discharge is large, the device stops and notifies the staff to adjust the angle of the eccentric wheel. Otherwise, the device operates normally;

[0029] S25. Detect the movement direction of the second plunger rod. If the second plunger rod is also in the discharge stroke with the movement direction towards the inlet pipe, it is determined that the movement directions of the current second plunger rod and the first plunger rod are the same, the pulsation rate during medium discharge is large, the device stops and notifies the staff to adjust the angle of the eccentric wheel. Otherwise, the device operates normally.

[0030] Preferably, the processing method further includes the feeding detection of the metering pump, which includes the following steps: S31. After the metering pump is installed, a flow detection device is arranged in the outlet pipe of the metering pump;

[0031] S32. Place the inlet pipe of the metering pump in the fluid to be transported and start the power motor;

[0032] S33. The flow detection device detects whether there is fluid passing through the outlet pipe. If so, it is determined that the current fluid passes through the metering pump to the designated position in the outlet pipe, and jumps to S34 for continuous detection. Otherwise, it is determined that the fluid has not reached the designated position, and the power motor continues to run;

[0033] S34. The flow detection device detects the fluid passing through the outlet pipe for a detection time of T. After the T time period, the detected flow rates are sorted out to obtain the minimum flow rate L1 and the maximum flow rate L2;

[0034] S35. Calculate L1 and L2. If L2 - L1 > 0.5L1, it is determined that the amplitude of the fluid flow rate fluctuation passing through the outlet pipe is large, and the metering pump needs to be adjusted. Otherwise, it is determined that the fluid flow rate fluctuation passing through the outlet pipe is small, the pulsation rate during fluid discharge from the outlet pipe is low, and it has high stability.

[0035] By adopting the above technical solutions, the beneficial effects are as follows: 1. The metering pump of the present application is powered by a power motor, and a reduction mechanism composed of a worm and a worm wheel is provided at the bottom of the power motor to reduce the output of the power motor. A double eccentric wheel shaft is provided on the worm wheel, and a connecting rod and a plunger are provided on the eccentric wheel shaft. The low-speed rotational motion of the power motor is converted into the reciprocating motion of the connecting rod. Specifically, when one of the plungers is in the suction stroke, the pressure inside the metering pump drops, and the medium enters the metering pump through the inlet and outlet valves under the action of the pressure. The power motor continues to operate. When the eccentric wheel shaft rotates to the dead point and is converted into the discharge stroke instantaneously, the inlet and outlet valves close until the plunger continues to move, causing the pressure inside the metering pump to rise and be greater than the stroke pressure, and then the valves open, so that the medium enters the pipeline as the plunger moves until the eccentric wheel rotates to the dead point and is converted into the suction stroke again. By alternating the above methods, the medium can be continuously transported from the low position to the high position, and the moving direction of the other plunger is opposite to that of this plunger. When one of the plungers is in the suction stroke, the other plunger is in the discharge stroke, which can reduce the pulsation rate of the medium discharge during the transportation of the metering pump.

[0036] 2. Further, the power end of the present application adopts a double eccentric wheel structure, which has a simple overall structure, high rigid strength, can withstand a large force during operation, and the contact area between the eccentric wheel and the connecting rod bushing is large, and the specific pressure value is large, so it has better wear resistance. The phase angles of the two eccentric wheels are staggered by 180°. The operation process is stable, and the overall vibration is small. The base of the power end is detachably connected to the pump core, so that when the metering pump fails or needs regular maintenance, the base can be conveniently and quickly removed, so as to check and repair the worm and worm wheel. The power motor and the power end adopt a worm and worm wheel combination. While the overall structure is compact, it has a large transmission ratio, which can accurately convert the high-speed rotation of the motor into a suitable low-speed rotation, provide a stable power input for the subsequent operation of the plunger, ensure the stability of the processing structure of the metering pump, and accurately control the conveying volume of the fluid.

[0037] 3. Meanwhile, an inner cylinder is provided inside the pump core of this application. The inner cylinder of this application includes an upper inner cylinder, a middle inner sleeve, and a lower inner sleeve. The upper inner cylinder, the middle inner sleeve, and the lower inner sleeve are connected by bolts. The above-mentioned split type facilitates the processing and manufacturing of the inner cylinder and subsequent maintenance, ensuring the tight connection of each component in the inner cylinder. The overall structure is stable and reliable, capable of adapting to complex working conditions during the processing, reducing the loosening and damage of the inner cylinder caused by vibration or impact during operation, and ensuring the stability of the metering pump during long-term operation. At the same time, the middle inner sleeve and the lower inner sleeve are welded assemblies. After welding, stress is eliminated by artificial aging, and the dimensions of each mating surface are processed by a horizontal machine tool to ensure the requirements of overall dimensional accuracy, concentricity, and position accuracy. The middle inner sleeve has an auxiliary wire guiding effect on the pump core, effectively preventing the pump core from colliding with the inner wall of the pump core during the extraction and reinstallation process. At the same time, connecting rods fixedly connected to the plunger rod are provided at both ends of the inner cylinder. Since the length of the connecting rod is relatively long, a multi-section combined structure is adopted for convenient processing and assembly, and the straightness of the connecting rod is ensured after processing. And both ends of the transition part of the connecting rod are rotatably connected to the fixed part, enabling the fixed part to rotate at a certain angle on the transition part, effectively eliminating the errors in processing and assembly. The fixed part of the connecting rod is rigidly connected to the power end and is guided by the transition part during operation, ensuring the linearity and stability of the plunger movement. As an optimization of the above solution, the plunger material of the metering pump in this application uses stainless steel material and is sprayed with chromium oxide, making the plunger have both toughness and extremely high surface hardness and smoothness, so that the plunger has good corrosion resistance and wear resistance.

[0038] 4. And, the hydraulic end has an inlet pipe provided at the bottom of the outer sleeve and a fastening flange provided inside the inlet pipe. The fastening flange and the outer sleeve adopt a conical surface seal, which is convenient for self-positioning and self-alignment during installation, and at the same time prevents the conical surface of the fastening flange from colliding with the inner wall of the outer sleeve during the extraction and reinstallation of the pump core. At the same time, a material channel is provided inside the pump head in the outer sleeve, and a packing device and inlet and outlet valves are provided in the material channel. The inlet and outlet valves of the pump adopt a ball valve structure. Since the valve ball has a self-cleaning performance during operation, it is not easy to get stuck during operation. At the same time, the valve ball is a standard part with good roundness accuracy and surface hardness. A packing gland sleeve is provided in the packing device. The connecting rod is inserted into the packing gland sleeve and sealed through the sealing structure inside the packing gland sleeve. The elastic force generated by the sealing structure makes the sealing structure closely contact the surface of the connecting rod to achieve sealing, ensuring the linearity during the movement of the plunger and not causing eccentric wear to the packing, improving the reliability of the seal and the service life of the sealing structure. Brief Description of the Drawings

[0039] Figure 1Schematic diagram of the specific structure of an embodiment of a high-strength radiation-proof submersible horizontal plunger metering pump and its processing method according to the present invention;

[0040] Figure 2 Sectional view of the specific structure of the power end of an embodiment of a high-strength radiation-proof submersible horizontal plunger metering pump and its processing method according to the present invention;

[0041] Figure 3 Sectional view of the pump core of an embodiment of a high-strength radiation-proof submersible horizontal plunger metering pump and its processing method according to the present invention;

[0042] Figure 4 Sectional view of the hydraulic end of an embodiment of a high-strength radiation-proof submersible horizontal plunger metering pump and its processing method according to the present invention;

[0043] Figure 5 Flow chart of the processing method of an embodiment of a high-strength radiation-proof submersible horizontal plunger metering pump and its processing method according to the present invention;

[0044] Figure 6 Flow chart of the detection method of the finished metering pump of an embodiment of a high-strength radiation-proof submersible horizontal plunger metering pump and its processing method according to the present invention;

[0045] Figure 7 Flow chart of the feeding detection of the metering pump of an embodiment of a high-strength radiation-proof submersible horizontal plunger metering pump and its processing method according to the present invention;

[0046] Reference numerals in the figure: 1, power motor; 2, worm; 3, power end; 31, plunger rod; 32, mounting base; 33, reduction device; 331, driving worm gear; 332, transmission shaft; 333, bearing cover; 34, eccentric wheel; 35, connecting rod; 36, crosshead pin; 4, pump core; 41, inner cylinder; 42, inner upper cylinder; 43, inner middle sleeve; 44, inner lower sleeve; 45, connecting rod; 451, fixing part; 452, transition part; 5, hydraulic end; 51, pump head; 52, outer sleeve; 53, inlet pipe; 54, outlet pipe; 55, fastening flange; 56, cavity; 57, material passage; 58, packing device; 581, stuffing box sleeve; 582, sealing structure; 59, connecting passage; 6, inlet and outlet valves; 61, outlet gland; 62, valve member; 63, valve ball. Detailed implementation manners

[0047] Refer to Figures 1 to 7 To further illustrate an embodiment of a high-strength radiation-proof submersible horizontal plunger metering pump and its processing method according to the present invention.

[0048] For ease of explanation, in the embodiments, spatial relative terms such as "upper", "lower", "left", "right", etc. are used to describe the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be positioned "above" the other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly.

[0049] Moreover, relative terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0050] A high-strength anti-radiation submerged horizontal plunger metering pump includes a power motor 1, and a worm 2 is provided at the bottom of the power motor 1. It further includes a power end 3: The power end 3 is arranged at the bottom of the power motor 1 and is in transmission connection with the worm 2 of the power motor 1. A plunger rod 31 is provided at the bottom of the power end 3, and the power end 3 is used to receive and transmit the control signal of the power motor 1;

[0051] A pump core 4: The pump core 4 is arranged at the bottom of the power end 3. An inner cylinder 41 is arranged inside the pump core 4. The inner cylinder 41 includes an inner upper cylinder 42, an inner middle sleeve 43, and an inner lower sleeve 44, and the inner upper cylinder 42, the inner middle sleeve 43, and the inner lower sleeve 44 are connected by bolts;

[0052] A hydraulic end 5: The hydraulic end 5 is arranged on the side of the pump core 4 away from the power end 3. The hydraulic end 5 includes a pump head 51 fixedly connected to the inner cylinder 41 and an outer sleeve 52 arranged at the bottom of the pump head 51. An inlet pipe 53 is further provided at the bottom of the outer sleeve 52, and an outlet pipe 54 is provided on the side wall of the outer sleeve 52.

[0053] An installation base 32 is further provided at the bottom of the power end 3. A speed reduction device 33 is arranged on the installation base 32. The speed reduction device 33 includes a transmission worm gear 331 arranged inside the power end 3, transmission shafts 332 arranged at both ends of the transmission worm gear 331, and bearing caps 333 arranged on the transmission shafts 332.

[0054] Preferably, eccentric wheels 34 are provided on the transmission shafts 332 at both ends of the worm 2, and the phase angle difference between the two eccentric wheels 34 is 180°. A connecting rod 35 is provided at the bottom of the eccentric wheel 34. The connecting rod 35 is rotatably connected to the eccentric wheel 34. A crosshead pin 36 is provided at the bottom of the connecting rod 35. The connecting rod 35 is rotatably connected to the plunger rod 31 through the crosshead pin 36.

[0055] Connecting rods 45 are provided on both sides of the inner cylinder body 41. The connecting rods 45 are fixedly connected to the connecting rod 35. The connecting rod 45 has fixing parts 451 provided at both ends thereof and a transition part 452 provided between the fixing parts 451. Both ends of the transition part 452 are rotatably connected to the fixing parts 451.

[0056] A fastening flange 55 is provided between the outer sleeve 52 of the hydraulic end 5 and the pump head 51. One end of the fastening flange 55 extends into the inlet pipe 53 of the outer sleeve 52 and abuts against the inner wall of the inlet pipe 53, and the other end abuts against the pump head 51 and forms a cavity 56 between the pump head 51 and the outer sleeve 52. The position of the cavity 56 matches the position of the outlet pipe 54.

[0057] Preferably, a material passage 57 is further provided in the pump head 51. A packing device 58 is provided in the material passage 57. The packing device 58 includes a stuffing box sleeve 581 provided on the inner wall of the material passage 57. The fixing part 451 of the connecting rod 45 is inserted into the stuffing box sleeve 581 and a sealing structure 582 is provided between the fixing part 451 and the stuffing box sleeve 581. A connecting passage 59 is further provided at the bottom of the pump head 51. The connecting passage 59 is used to communicate the material passage 57 in the pump head 51 and the outlet pipe 54. The material of the sealing structure 582 is one of radiation-resistant FEP or perfluoroether rubber.

[0058] Preferably, an inlet and outlet valve 6 is further provided in the plunger passage. The inlet and outlet valve 6 includes an outlet compression cap 61 provided at the outlet of the plunger passage, a valve member 62 provided in the plunger passage, and a valve ball 63 provided in the valve member 62.

[0059] This application also provides a processing method for a high-strength radiation-proof submersible horizontal plunger metering pump, including the following steps: S11. Connect a worm to the bottom of the power motor, and at the same time insert the power motor connected with the worm into the power end, so that the worm gear in the power end matches the worm at the bottom of the power motor;

[0060] S12. Insert a transmission shaft into the worm gear, and at the same time install eccentric wheels at both ends of the worm gear, so that the phase angle difference between the eccentric wheels at both ends of the worm gear is 180°;

[0061] S13. Install a plunger rod at the bottom of the eccentric wheel, start the power motor, and make the movement directions of the plunger rods corresponding to the two eccentric wheels opposite to each other;

[0062] S14. After the installation at the power end is completed, assemble the inner upper cylinder, inner middle sleeve, and inner lower sleeve of the inner cylinder of the pump core, and connect them with bolts at the joints. After the connection is completed, detect the accuracy of the inner cylinder of the pump core to ensure that the dimensional accuracy, concentricity, and position accuracy meet the requirements;

[0063] S15. Assemble the connecting rod so that the fixing part and the transition part are connected to each other, and detect the accuracy of the connecting rod after the assembly is completed to make it meet the requirements;

[0064] S16. Assemble the completed pump core and the connecting rod into the power end so that the power end and the power motor guide the pump core;

[0065] S17. Assemble the pump head for installation. Specifically, it is necessary to install an inlet and outlet valve at one end of the material passage in the pump head, and install a packing device at the other end of the material passage;

[0066] S18. Install an outlet pipe at the bottom of the outer sleeve, and install a fastening flange on the inner bottom surface of the outer sleeve corresponding to the position of the outlet pipe;

[0067] S19. Install the pump head into the inner part of the outer sleeve. During the installation process, make the inlet and outlet valve in the pump head close to the inner bottom surface of the outer sleeve and make the connecting passage in the pump head communicate with the outlet pipe to form a hydraulic end;

[0068] S20. After the assembly of the hydraulic end is completed, install the hydraulic end at the bottom of the pump core and make the material passage of the pump head in the hydraulic end match the connecting rod of the pump core.

[0069] Preferably, the processing method further includes a detection method for the finished metering pump. The detection method includes the following steps: S21. Start the power motor to drive the worm at the bottom of the power motor to rotate, and at the same time, the worm drives the transmission worm gear connected to it to rotate;

[0070] S22. When the transmission worm gear rotates, the transmission shafts at both ends of the transmission worm gear rotate synchronously, so that the eccentric wheels on the transmission shafts rotate;

[0071] S23. During the rotation of the eccentric wheels, detect the movement states of the plunger rods corresponding to the two eccentric wheels. If the movement direction of the first plunger rod is the suction stroke away from the inlet pipe, jump to S4 for detection. Otherwise, if the movement direction of the first plunger rod is the discharge stroke close to the inlet pipe, jump to S5 for detection;

[0072] S24. Detect the movement direction of the second plunger rod. If the second plunger rod is also in the suction stroke with the movement direction away from the inlet pipe, it is determined that the current movement directions of the second plunger rod and the first plunger rod are the same, the pulsation rate during medium discharge is large, the device stops and notifies the staff to adjust the angle of the eccentric wheel. Otherwise, the device operates normally.

[0073] S25. Detect the movement direction of the second plunger rod. If the second plunger rod is also in the discharge stroke with the movement direction towards the inlet pipe, it is determined that the current movement directions of the second plunger rod and the first plunger rod are the same, the pulsation rate during medium discharge is large, the device stops and notifies the staff to adjust the angle of the eccentric wheel. Otherwise, the device operates normally.

[0074] Preferably, the processing method further includes the feeding detection of the metering pump, which includes the following steps: S31. After the metering pump is installed, a flow detection device is arranged in the outlet pipe of the metering pump.

[0075] S32. Place the inlet pipe of the metering pump in the fluid to be transported and start the power motor.

[0076] S33. The flow detection device detects whether there is fluid passing through the outlet pipe. If so, it is determined that the current fluid passes through the metering pump to the designated position in the outlet pipe, and jump to S34 for continuous detection. Otherwise, it is determined that the fluid has not reached the designated position, and the power motor continues to run.

[0077] S34. The flow detection device detects the fluid passing through the outlet pipe for a detection time of T. After the T time period, the detected flow rates are sorted out to obtain the minimum flow rate L1 and the maximum flow rate L2.

[0078] S35. Calculate L1 and L2. If L2 - L1 > 0.5L1, it is determined that the amplitude of the fluid flow rate fluctuation passing through the outlet pipe is large, and the metering pump needs to be adjusted. Otherwise, it is determined that the amplitude of the fluid flow rate fluctuation passing through the outlet pipe is small, the pulsation rate during fluid discharge from the outlet pipe is low, and it has high stability.

[0079] This application provides power to the metering pump of this application through the power motor 1, and a speed reduction mechanism composed of a worm and worm gear 2 is arranged at the bottom of the power motor 1 to reduce the output of the power motor 1. A double eccentric wheel 34 shaft is arranged on the worm gear, and a connecting rod 35 and a plunger are arranged on the eccentric wheel 34 shaft. The low-speed rotational motion of the power motor 1 is converted into the reciprocating motion of the connecting rod 35. Specifically, when one of the plungers is in the suction stroke, the pressure inside the metering pump drops, and the medium enters the metering pump through the inlet and outlet valves 6 under the action of pressure. The power motor 1 continues to operate. When the eccentric wheel 34 shaft rotates to the dead center and changes to the discharge stroke instantaneously, the inlet and outlet valves 6 close until the plunger continues to move, causing the pressure inside the metering pump to rise and be greater than the stroke pressure, at which time it opens, allowing the medium to enter the pipeline as the plunger moves until the eccentric wheel 34 rotates to the dead center and changes to the suction stroke again. By alternating the above methods, the medium can be continuously transported from the low position to the high position, and the moving direction of the other plunger is opposite to that of this plunger. When one of the plungers is in the suction stroke, the other plunger is in the discharge stroke, which can reduce the pulsation rate of the medium discharge during the transportation of the metering pump.

[0080] Furthermore, the power end 3 of this application adopts a double eccentric wheel 34 structure. The overall structure is simple, with high rigidity and strength, and can withstand large forces during operation. The contact area between the eccentric wheel 34 and the bushing of the connecting rod 35 is large, and the specific pressure value is large, with better wear resistance. The phase angles of the two eccentric wheels 34 are staggered by 180°. The operation process is stable, and the overall vibration is small. The base of the power end 3 is detachably connected to the pump core 4, so that when the metering pump fails or regular maintenance is required, the base can be conveniently and quickly removed to check and repair the worm and worm gear 2. The power motor 1 and the power end 3 are matched with the worm and worm gear 2. While the overall structure is compact, it has a large transmission ratio, can accurately convert the high-speed rotation of the motor into a suitable low-speed rotation, provide a stable power input for the subsequent operation of the plunger, ensure the stability of the processing structure of the metering pump, and accurately control the conveying volume of the fluid.

[0081] Meanwhile, an inner cylinder 41 is provided inside the pump core 4 of the present application. The inner cylinder 41 of the present application includes an inner upper cylinder 42, an inner middle sleeve 43, and an inner lower sleeve 44. The inner upper cylinder 42, the inner middle sleeve 43, and the inner lower sleeve 44 are connected by bolts. The above-mentioned split type facilitates the processing and manufacturing of the inner cylinder 41 and subsequent maintenance, ensures the tightness of the connection of each component in the inner cylinder 41, has a stable and reliable overall structure, can adapt to complex working conditions during the processing, reduces the loosening and damage of the inner cylinder 41 caused by vibration or impact during operation, and guarantees the stability of the long-term operation of the metering pump. At the same time, the inner middle sleeve and the inner lower sleeve 44 are group weldments. After welding, stress is eliminated by artificial aging, and the dimensions of each mating surface are processed by a horizontal machine tool to ensure the requirements of overall dimensional accuracy, concentricity, and position accuracy, so that the inner middle sleeve 43 has an auxiliary wire guiding effect on the pump core 4, effectively preventing the pump core 4 from colliding with the inner wall of the pump core 4 during the extraction and reinstallation processes. At the same time, connecting rods 45 fixedly connected to the plunger rod 31 are provided at both ends of the inner cylinder 41. Since the length of the connecting rod 45 is relatively long, a multi-section combined structure is adopted for convenient processing and assembly, and the straightness of the connecting rod 45 is ensured after processing. Moreover, both ends of the transition portion 452 of the connecting rod 45 are rotatably connected to the fixing portion 451, enabling the fixing portion 451 to rotate at a certain angle on the transition portion 452, effectively eliminating the errors in processing and assembly. The fixing portion 451 of the connecting rod 45 is rigidly connected to the power end 3 and is guided by the transition portion 452 during operation, ensuring the straightness and stability of the plunger movement. As an optimization of the above solution, the plunger material of the metering pump of the present application is made of stainless steel and sprayed with chromium oxide, making the plunger have both toughness and extremely high surface hardness and smoothness, so that the plunger has good corrosion resistance and wear resistance.

[0082] Moreover, the hydraulic end 5 is provided with an inlet pipe 53 at the bottom of the outer sleeve 52 and a fastening flange 55 arranged in the inlet pipe 53. The fastening flange 55 and the outer sleeve 52 adopt a conical surface seal, which facilitates self-positioning and self-alignment during installation. At the same time, it prevents the conical surface of the fastening flange 55 from colliding with the inner wall of the outer sleeve 52 during the extraction and reinstallation of the pump core 4. Meanwhile, a material passage 57 is arranged inside the pump head 51 in the outer sleeve 52. A packing device 58 and an inlet and outlet valve 6 are arranged in the material passage 57. The inlet and outlet valve 6 of the pump adopts a ball valve structure. Since the valve ball 63 has a self-cleaning performance during operation, it is not easily blocked during operation. At the same time, the valve ball 63 is a standard part with good roundness accuracy and surface hardness. A stuffing box sleeve 581 is arranged in the packing device 58. The connecting rod 45 is inserted into the stuffing box sleeve 581 and sealed through a sealing structure 582 in the stuffing box sleeve 581. The elastic force generated by the sealing structure 582 enables the sealing structure 582 to be in close contact with the surface of the connecting rod 45 to achieve sealing, ensuring the straightness during the movement of the plunger, preventing uneven wear of the packing seal, and improving the reliability of the seal and the service life of the sealing structure 582.

[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A submersible horizontal reciprocating plunger metering pump with high strength and radiation protection, comprising a power motor (1), and a worm (2) is arranged at the bottom of the power motor (1), characterized in that, It also includes a power end (3): The power end (3) is arranged at the bottom of the power motor (1) and is in transmission connection with the worm (2) of the power motor (1). A plunger rod (31) is provided at the bottom of the power end (3), and the power end (3) is used to receive and transmit the control signal of the power motor (1). Pump core (4): The pump core (4) is arranged at the bottom of the power end (3). An inner cylinder (41) is provided inside the pump core (4). The inner cylinder (41) includes an inner upper cylinder (42), an inner middle sleeve (43), and an inner lower sleeve (44), and the inner upper cylinder (42), the inner middle sleeve (43), and the inner lower sleeve (44) are connected by bolts. Hydraulic end (5): The hydraulic end (5) is arranged on the side of the pump core (4) away from the power end (3). The hydraulic end (5) includes a pump head (51) fixedly connected to the inner cylinder (41) and an outer sleeve (52) arranged at the bottom of the pump head (51). An inlet pipe (53) is further provided at the bottom of the outer sleeve (52), and an outlet pipe (54) is provided on the side wall of the outer sleeve (52).

2. The submersible horizontal plunger metering pump with high-intensity radiation protection according to claim 1, characterized in that, An installation base (32) is further provided at the bottom of the power end (3). A speed reduction device (33) is provided on the installation base (32). The speed reduction device (33) includes a transmission worm gear (331) arranged inside the power end (3), transmission shafts (332) arranged at both ends of the transmission worm gear (331), and bearing caps (333) arranged on the transmission shafts (332).

3. The submersible horizontal plunger metering pump with high-intensity radiation protection according to claim 2, characterized in that, Eccentric wheels (34) are provided on the transmission shafts (332) at both ends of the worm (2), and the phase angle difference between the two eccentric wheels (34) is 180°. A connecting rod (35) is provided at the bottom of the eccentric wheel (34). The connecting rod (35) is rotatably connected to the eccentric wheel (34). A crosshead pin (36) is provided at the bottom of the connecting rod (35). The connecting rod (35) is rotatably connected to the plunger rod (31) through the crosshead pin (36).

4. The submerged horizontal piston metering pump with high strength radiation protection according to claim 1, characterized in that, Connecting rods (45) are provided on both sides of the inner cylinder (41). The connecting rods (45) are fixedly connected to the connecting rod (35). The connecting rod (45) has fixing parts (451) arranged at both ends and a transition part (452) arranged between the fixing parts (451). The two ends of the transition part (452) are respectively rotatably connected to the fixing parts (451).

5. A submerged horizontal plunger metering pump with high-intensity radiation protection according to claim 1, characterized in that, A fastening flange (55) is provided between the outer sleeve (52) of the hydraulic end (5) and the pump head (51). One end of the fastening flange (55) extends into the inlet pipe (53) of the outer sleeve (52) and abuts against the inner wall of the inlet pipe (53), and the other end abuts against the pump head (51) and forms a cavity (56) inside the pump head (51) and the outer sleeve (52). The position of the cavity (56) matches the position of the outlet pipe (54).

6. A submerged horizontal plunger metering pump with high-intensity radiation protection according to claim 4, characterized in that, The pump head (51) is further provided with a material passage (57), a packing device (58) is arranged in the material passage (57), the packing device (58) includes a stuffing box sleeve (581) arranged on the inner wall of the material passage (57), the fixed part (451) of the connecting rod (45) is inserted into the stuffing box sleeve (581), and a sealing structure (582) is arranged between the fixed part (451) and the stuffing box sleeve (581). A connecting passage (59) is further arranged at the bottom of the pump head (51), and the connecting passage (59) is used to communicate the material passage (57) in the pump head (51) and the outlet pipe (54). The material of the sealing structure (582) is one of radiation-resistant FEP or perfluoroether rubber.

7. The submersible horizontal piston metering pump with high strength and radiation protection according to claim 5, characterized in that, An inlet and outlet valve (6) is further arranged in the plunger passage. The inlet and outlet valve (6) includes an outlet gland (61) arranged at the outlet of the plunger passage, a valve member (62) arranged in the plunger passage, and a valve ball (63) arranged in the valve member (62).

8. A processing method for a submersible horizontal piston metering pump with high strength radiation protection according to any one of claims 1-7, characterized in that, It includes the following steps: S11. Connect a worm to the bottom of the power motor, and at the same time insert the power motor with the worm into the power end, so that the worm gear in the power end matches the worm at the bottom of the power motor. S12. Insert a transmission shaft into the worm gear, and at the same time install eccentric wheels at both ends of the worm gear, so that the phase angle difference between the eccentric wheels at both ends of the worm gear is 180°. S13. Install a plunger rod at the bottom of the eccentric wheel, and start the power motor, so that the movement directions of the plunger rods corresponding to the two eccentric wheels are opposite. S14. After the installation of the power end is completed, assemble the inner upper cylinder, the inner middle sleeve and the inner lower sleeve of the inner cylinder of the pump core, and connect them by bolts at the joints. After the connection is completed, detect the accuracy of the inner cylinder of the pump core to ensure that the dimensional accuracy, concentricity and position accuracy meet the requirements. S15. Assemble the connecting rod so that the fixed part and the transition part are connected to each other, and detect the accuracy of the connecting rod after the assembly is completed to make it meet the requirements. S16. Assemble the assembled pump core and the connecting rod into the power end, so that the power end and the power motor guide the pump core. S17. Assemble the pump head for installation. Specifically, it is necessary to install an inlet and outlet valve at one end of the material passage in the pump head, and install a packing device at the other end of the material passage. S18. Install an outlet pipe at the bottom of the outer sleeve, and install a fastening flange on the inner bottom surface of the outer sleeve corresponding to the position of the outlet pipe. S19. Install the pump head into the inner part of the outer sleeve. During the installation process, make the inlet and outlet valve in the pump head close to the inner bottom surface of the outer sleeve and make the connecting passage in the pump head communicate with the outlet pipe to form a hydraulic end. S20. After the assembly of the hydraulic end is completed, install the hydraulic end at the bottom of the pump core, and make the material passage of the pump head in the hydraulic end match the connecting rod of the pump core.

9. The processing method of a high-strength radiation-proof submerged horizontal plunger metering pump according to claim 8, characterized in that, The processing method further includes a detection method for the finished metering pump. The detection method includes the following steps: S21. Start the power motor, drive the worm at the bottom of the power motor to rotate, and at the same time the worm drives the transmission worm gear connected to it to rotate. S22. When the transmission worm gear rotates, the transmission shafts at both ends of the transmission worm gear rotate synchronously, so that the eccentric wheels on the transmission shafts rotate; S23. During the rotation of the eccentric wheels, detect the motion states of the plunger rods corresponding to the two eccentric wheels. If the motion direction of the first plunger rod is the suction stroke away from the inlet pipe, jump to S4 for detection. Otherwise, if the motion direction of the first plunger rod is the discharge stroke close to the inlet pipe, jump to S5 for detection; S24. Detect the motion direction of the second plunger rod. If the second plunger rod is also in the suction stroke with the motion direction away from the inlet pipe, it is determined that the current motion directions of the second plunger rod and the first plunger rod are the same, the pulsation rate during medium discharge is large, the device stops and notifies the staff to adjust the angle of the eccentric wheel. Otherwise, the device operates normally; S25. Detect the motion direction of the second plunger rod. If the second plunger rod is also in the discharge stroke with the motion direction close to the inlet pipe, it is determined that the current motion directions of the second plunger rod and the first plunger rod are the same, the pulsation rate during medium discharge is large, the device stops and notifies the staff to adjust the angle of the eccentric wheel. Otherwise, the device operates normally.

10. The processing method of a high-strength radiation-proof submerged horizontal piston metering pump according to claim 8, characterized in that, The processing method further includes the feeding detection of the metering pump, including the following steps: S31. After the metering pump is installed, a flow detection device is arranged in the outlet pipe of the metering pump; S32. Place the inlet pipe of the metering pump in the fluid to be transported and start the power motor; S33. The flow detection device detects whether there is fluid passing through the outlet pipe. If so, it is determined that the current fluid reaches the specified position in the outlet pipe through the metering pump, and jump to S34 for continuous detection. Otherwise, it is determined that the fluid does not reach the specified position, and the power motor continues to operate; S34. The flow detection device detects the fluid passing through the outlet pipe for a detection time of T. After the T time period, sort out the detected flow rate to obtain the minimum flow rate L1 and the maximum flow rate L2; S35. Calculate L1 and L2. If L2 - L1 > 0.5L1, it is determined that the amplitude of the fluid flow rate fluctuation passing through the outlet pipe is large, and the metering pump needs to be adjusted. Otherwise, it is determined that the fluid flow rate fluctuation passing through the outlet pipe is small, the pulsation rate when the fluid is discharged from the outlet pipe is low, and it has high stability.

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