Pump core for submerged plunger metering pump

Abstract

The utility model discloses a pump core for a submerged plunger metering pump, and aims to provide a pump core for a submerged plunger metering pump, which is accurate in connection and stable in infusion, and is characterized by comprising a fluid end component and an inner barrel fixed on one side of the fluid end component, the inner barrel body comprises an upper inner barrel body, a middle inner sleeve and a lower inner sleeve, the upper inner barrel body, the middle inner sleeve and the lower inner sleeve are sequentially connected through bolts, and plunger assemblies are symmetrically arranged on the two sides of the inner barrel body; the plunger assembly comprises lower connecting rods fixed to the two sides of the lower inner sleeve, an upper connecting rod arranged in the upper inner sleeve and a transition connecting rod arranged between the lower connecting rod and the upper connecting rod, and the transition connecting rod is in transmission connection with the lower connecting rod and the upper connecting rod through couplings. The inner barrel is sleeved with an upper guide sleeve and a lower guide sleeve which are used for guiding the plunger assembly. The plunger pump is suitable for the technical field of plunger pumps.

Description

TECHNICAL FIELD

[0001] The utility model relates to a technical field of plunger pump, more specifically, it relates to a pump core for under-liquid plunger metering pump. BACKGROUND

[0002] With the rapid development of nuclear power industry in China, the demand of spent fuel reprocessing is increasing, the development demand of reprocessing industry in China is very urgent, and the reprocessing project with high processing capacity is the development trend.

[0003] The spent fuel reprocessing project is a system engineering, according to the operation characteristics of the reprocessing project and the special requirements generated by the radioactive environment and medium, the output liquid is stable and has no obvious fluctuation, shielding safety measures should be taken as far as possible in fluid delivery, and indirect or remote maintenance and replacement mode, transfer and disposal of these equipment are adopted. The delivery of radioactive liquid is very demanding, and the installation and maintenance of the delivery equipment are very difficult. Therefore, high reliability is required to achieve maintenance-free or less maintenance and easy maintenance within the service life of the plant.

[0004] The pump core for the under-liquid plunger metering pump of the application adopts a double-cylinder plunger pump structure, and the alternating linear reciprocating process of the double plungers is realized under the control of the power end to ensure that the output liquid is stable and has no obvious fluctuation. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a pump core for an under-liquid plunger metering pump which can realize precise connection and stable liquid delivery.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a pump core for an under-liquid plunger metering pump, comprising a hydraulic end assembly and an inner cylinder fixed on one side of the hydraulic end assembly, the inner cylinder comprises an upper inner cylinder, a middle inner sleeve and a lower inner sleeve, and the upper inner cylinder, the middle inner sleeve and the lower inner sleeve are sequentially connected by bolts, the inner cylinder is symmetrically provided with a plunger assembly on both sides, the plunger assembly comprises a lower connecting rod fixed on both sides of the lower inner sleeve, an upper connecting rod arranged in the upper inner cylinder and a transition connecting rod arranged between the lower connecting rod and the upper connecting rod, the transition connecting rod is drivingly connected with the lower connecting rod and the upper connecting rod through the couplings, and the inner cylinder is sleeved with upper and lower guide sleeves for guiding the plunger assembly.

[0007] The utility model is further provided as follows: the hydraulic end assembly comprises a pump head body connected with the upper inner sleeve, a lower outer sleeve arranged on one side of the pump head body and a plunger and an integrated plunger packing assembly arranged in the pump head body, the lower outer sleeve is provided with an inlet pipe at the top end and an outlet pipe arranged on the side wall.

[0008] The utility model further sets up: the flange is established between pump head body and lower outer sleeve, pump head body, flange and outer sleeve all are equipped with the matching positioning hole, and the positioning hole all is the taper face seal surface.

[0009] The utility model further sets up: the mounting hole is equipped with the radial diameter and the radial diameter of shaft coupling are matched at transition connecting rod both ends.

[0010] The utility model further sets up: the plunger assembly adopts stainless steel material, and the plunger assembly and the guiding portion of upper connecting rod and lower connecting rod are all sprayed with chromium oxide.

[0011] The utility model further sets up: the lower inner sleeve and lower inner sleeve are a group of welded parts, and the inner sleeve is equipped with auxiliary guide, and the auxiliary guide both sides are symmetrically equipped with the limiting slot that is adapted with transition connecting piece.

[0012] The utility model has the advantages of:

[0013] 1. Inner cylinder body is connected by bolt with upper inner cylinder body, middle inner sleeve and lower inner sleeve. This split type structure is convenient to assemble and disassemble, when the pump core has a fault or needs to be maintained and parts are replaced, a certain cylinder can be operated alone, without the need to disassemble the whole inner cylinder body, greatly reducing the maintenance difficulty and maintenance time, the lower connecting rod of plunger assembly is fixed on both sides of lower inner sleeve, the upper connecting rod is arranged in upper inner cylinder body, and is connected by shaft coupling transmission through transition connecting rod in the middle, this multi-section combination design is convenient to process and assemble, makes the connection of plunger assembly more stable, can effectively reduce the shaking of plunger in the working process, and the use of shaft coupling can buffer and adjust the force between connecting parts to a certain extent, reduces the risk of damage of parts due to uneven stress, the inner cylinder body is sleeved with upper and lower guide sleeves for guiding plunger assembly, the guide sleeve can ensure that the plunger moves along the accurate straight line track, reduces the friction and wear between plunger and other parts.

[0014] 2. The inlet pipe is arranged at the top end of the lower outer sleeve, and the outlet pipe is located on the side wall. Such a layout helps to form a smooth and reasonable fluid conveying path, enabling the fluid to efficiently enter and exit the pump head body in the designed direction, ensuring the continuity and stability of fluid conveying, and improving the working efficiency of the pump. The integrated plunger packing assembly is inside the pump head body, which may have better sealing performance compared to split type structures, effectively reducing fluid leakage, avoiding material waste, and helping to maintain stable pressure inside the system, ensuring long-term stable operation of the pump. A flange is arranged between the pump head body and the lower outer sleeve. The pump head body, the flange, and the outer sleeve are all provided with matching positioning holes, and the positioning holes are all tapered surfaces, which facilitate self-positioning and self-centering during installation, and prevent the sealing tapered surface of the pump core from colliding with the inner wall of the outer sleeve during pulling and reassembling.

[0015] 3. The middle inner sleeve and the lower inner sleeve are a welded assembly, after welding, artificial aging is used to eliminate stress, and the inner middle sleeve is provided with an auxiliary guide, limit grooves matched with the transition connecting rod are symmetrically arranged on the two sides of the auxiliary guide, the auxiliary guide has an auxiliary guiding effect during installation of the pump core, and the auxiliary guide prevents the sealing cone surface from colliding with the inner wall of the outer sleeve during pulling out and reassembling. The transition connecting rod is provided with mounting holes at the two ends, the diameters of the mounting holes are matched with the diameters of the shaft couplings, appropriate diameter matching ensures that the shaft couplings and the transition connecting rod are tightly fitted and connected stably, during operation of the equipment, the transition connecting rod can effectively transmit torques and other forces, and the efficiency of assembly is greatly improved.

[0016] 4. The plunger assembly is made of stainless steel material, can resist corrosion of corrosive media that may exist in various working environments, can effectively prevent the plunger assembly from rusting and being corroded, thereby prolonging the service life of the plunger assembly, reducing frequent replacement of parts caused by material corrosion, and the guide portions of the plunger assembly and the upper and lower connecting rods are sprayed with chromium oxide, so that the guide portions have toughness, high surface hardness and smoothness, good corrosion resistance and wear resistance, and movement is smoother, which helps to maintain good cooperation precision between parts and ensures long-term stable and efficient operation of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the utility model;

[0018] Figure 1 The drawings show that: 1, the inlet pipe; 2, the outlet pipe; 3, flange; 4, fluid end assembly; 5, lower inner sleeve; 6, middle inner sleeve; 7, inner cylinder; 8, shaft coupling; 9, lower outer sleeve; 10, pump head body; 11, lower connecting rod; 12, transition connecting rod; 13, upper connecting rod; 14, upper inner cylinder; 15, auxiliary guide. DETAILED DESCRIPTION

[0019] Refer to Figure 1 The utility model embodiment is further described.

[0020] In order to facilitate the description, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to describe the relationship of one element or feature with respect to another element or feature shown in the drawings. It should be understood that, in addition to the orientation shown in the drawings, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the drawing is inverted, the element described as being "below" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "below" can include both upward and downward orientations. The spatial relative description used herein can be interpreted accordingly when the device is positioned in other ways (rotated 90 degrees or positioned in other orientations).

[0021] Moreover, the relative terms such as "first" and "second" and the like are used merely to distinguish one from another of a same name, without necessarily requiring or implying any such actual relationship or order between such terms.

[0022] As Figure 1 A pump core for a submersible plunger metering pump, comprising a fluid end assembly 4 and an inner cylinder 7 fixed on one side of the fluid end assembly 4, wherein the inner cylinder 7 comprises an upper inner cylinder 147, a middle inner sleeve 6 and a lower inner sleeve 5, and the upper inner cylinder 147, the middle inner sleeve 6 and the lower inner sleeve 5 are sequentially connected by bolts, and such a split structure facilitates assembly and disassembly, and when a certain part of the pump core fails or needs to be repaired or replaced, a certain cylinder can be operated individually without the need to disassemble the entire inner cylinder 7, thereby greatly reducing the difficulty and time of maintenance, and the inner cylinder 7 is symmetrically provided with a plunger assembly on both sides, the plunger assembly comprises a lower connecting rod 11 fixed on both sides of the lower inner sleeve 5, an upper connecting rod 13 arranged in the upper inner cylinder 147, and a transition connecting rod 12 arranged between the lower connecting rod 11 and the upper connecting rod 13, and the transition connecting rod 12 is drivingly connected with the lower connecting rod 11 and the upper connecting rod 13 through a shaft coupling 8, and such a multi-segment combined design facilitates processing and assembly, makes the connection of the plunger assembly more stable, can effectively reduce the shaking of the plunger during operation, and the use of the shaft coupling 8 can buffer and adjust the acting force between the connecting parts to a certain extent, reduce the risk of damage of the parts due to uneven stress, thereby improving the stability and service life of the entire plunger assembly, and the inner cylinder 7 is sleeved with upper and lower guide sleeves for guiding the plunger assembly, and the guide sleeves can ensure that the plunger moves along an accurate straight line track during movement, reducing the friction and wear between the plunger and other parts.

[0023] The fluid end assembly 4 comprises a pump head body 10 connected with the upper inner sleeve, a lower outer sleeve 9 arranged on one side of the pump head body 10, and a plunger and an integrated plunger packing assembly arranged in the pump head body 10, and the lower outer sleeve 9 is provided with an inlet pipe 1 at the top end and an outlet pipe 2 arranged on the side wall, and such a layout helps to form a smooth and reasonable fluid conveying path, so that the fluid can efficiently enter and exit the pump head body 10 according to the designed flow direction, ensuring the continuity and stability of fluid conveying, and improving the working efficiency of the pump,

[0024] The integrated plunger filler assembly in the pump head body 10 can have better sealing performance than the split structure, effectively reducing fluid leakage, avoiding material waste, maintaining the stability of the system pressure, and ensuring long-term stable operation of the pump. The pump head body 10, the flange 3, and the outer sleeve are provided with matching positioning holes, and the positioning holes are all conical faces, which can be self-positioned and centered during installation, and can prevent the sealing cone from colliding with the inner wall of the outer sleeve during the pulling and reinstallation process.

[0025] The inner sleeve 6 and the lower inner sleeve 5 are a welded component, and after welding, artificial aging is used to eliminate stress. The size of all mating surfaces is machined on a machine tool to ensure dimensional accuracy, concentricity, and location accuracy. The inner sleeve is provided with an auxiliary guide 15, and the auxiliary guide 15 is symmetrically provided with a limiting groove matched with the transition connecting piece. The auxiliary guide 15 has an auxiliary guiding effect during installation of the pump core, preventing the sealing cone from colliding with the inner wall of the outer sleeve during the pulling and reinstallation process. The transition connecting rod 12 is provided with mounting holes at both ends, and the diameter of the mounting holes is matched with the radial diameter of the shaft coupling 8. The appropriate diameter matching ensures that the shaft coupling 8 and the transition connecting rod 12 are tightly connected and stable. During equipment operation, torque and other forces can be effectively transmitted, and the assembly efficiency is greatly improved.

[0026] The plunger component is also long in length, facilitating processing and assembly by adopting a multi-segment combination. The plunger component mainly includes a plunger, a lower connecting rod 11, a transition connecting rod 12, an upper connecting rod 13, and a cross shaft coupling 8. The transition connecting rod 12 is long in length, and the mounting holes at both ends are machined on a horizontal machining center machine tool to ensure that the concentricity is within 0.02 mm and the straightness of the assembled plunger component. The transition connecting rod 12 and the upper and lower connecting rods 11 are connected by floating cross shaft couplings 8. The cross shaft coupling 8 allows a radial tolerance of ±0.5 mm and rotates around the shaft pin at a certain angle. Therefore, the double cross shaft coupling 8 floating connection can eliminate processing and assembly errors.

[0027] The plunger assembly is made of stainless steel, which can resist the corrosion of corrosive media that may exist in various working environments, effectively prevent rust and corrosion of the plunger assembly, prolong its service life, reduce frequent replacement of parts due to material corrosion, and the guide parts of the plunger assembly and the upper and lower connecting rods 11 are sprayed with chromium oxide, which has toughness, high surface hardness and smoothness, good corrosion resistance and wear resistance, smooth movement, and helps to maintain good matching precision between components, ensuring long-term stable and efficient operation of the equipment.

[0028] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any change and replacement within the technical scheme of the present application made by those skilled in the art shall be included in the protection scope of the present application.

Claims

1. A pump cartridge for a submersible plunger metering pump, characterized by, The hydraulic end assembly (4) and the inner cylinder (7) fixed on one side of the hydraulic end assembly (4) are included, the inner cylinder (7) includes an upper inner cylinder (14), a middle inner sleeve (6) and a lower inner sleeve (5), and the upper inner cylinder (14), the middle inner sleeve (6) and the lower inner sleeve (5) are sequentially connected by bolts, the inner cylinder (7) is symmetrically provided with a plunger assembly on both sides, the plunger assembly includes a lower connecting rod (11) fixed on both sides of the lower inner sleeve (5), an upper connecting rod (13) arranged in the upper inner cylinder (14) and a transition connecting rod (12) arranged between the lower connecting rod (11) and the upper connecting rod (13), the transition connecting rod (12) is respectively connected with the lower connecting rod (11) and the upper connecting rod (13) through the couplings (8), and the inner cylinder (7) is sleeved with upper and lower guide sleeves for guiding the plunger assembly.

2. A pump element for a submersible plunger metering pump according to claim 1, wherein, The hydraulic end assembly (4) includes a pump head body (10) connected with the upper inner sleeve, a lower outer sleeve (9) arranged on one side of the pump head body (10) and a plunger and an integrated plunger packing assembly arranged in the pump head body (10), and the lower outer sleeve (9) is provided with an inlet pipe (1) at the top end and an outlet pipe (2) arranged on the side wall.

3. A pump element for a submersible plunger metering pump according to claim 2, wherein, The pump head body (10) and the lower outer sleeve (9) are provided with a flange (3), the pump head body (10), the flange (3) and the outer sleeve are provided with matching positioning holes, and the positioning holes are all conical faces.

4. A pump element for a submersible plunger metering pump according to claim 1, wherein, The transition connecting rod (12) is provided with mounting holes at both ends, and the diameters of the mounting holes are matched with the diameters of the couplings (8).

5. A pump element for a submersible plunger metering pump according to claim 1, wherein, The plunger assembly is made of stainless steel, and the plunger assembly and the guide portions of the upper and lower connecting rods (11) are sprayed with chromium oxide.

6. A pump element for a submersible plunger metering pump according to claim 1, wherein, The middle inner sleeve (6) and the lower inner sleeve (5) are a group of welded parts, and the middle inner sleeve (6) is provided with an auxiliary guide (15), and the auxiliary guide (15) is symmetrically provided with a limiting groove matched with the transition connecting piece on both sides.

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