Movable ring type pump head assembly for screwing split plunger rod

Abstract

The invention discloses a movable ring type pump head assembly for screwing a split plunger rod, relates to the technical field of plunger pumps, and aims to solve the problems that the energy efficiency utilization rate of a plunger pump is not high, the repeatability of fluid conveying conditions is poor, and the fluid conveying state is damaged due to the fact that a plunger friction pair is exchanged. By arranging the pump body, the pump head body, the first plunger rod, the second plunger rod and the threaded butt joint groove, the risk that fluid generates critical state sudden change is reduced, and the identity of the shape of the conveying fluid left on the pump head is improved; the fluctuation amplitude of the flowing state of the conveying fluid with the different specifications is reduced, the axial movement noise is lowered, and the control precision of the conveying volume change of the micro-fluid used by the subsection plunger in an interchanging mode is improved. By arranging the pump body, the pump head body, the movable ring rod, the pressing piece, the guide groove, the movable ring groove and the guide sliding block, the risks of internal dislocation and power transmission disconnection of the interchangeable pump head are reduced, and the operation convenience of interchangeable use of the pump head is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps, and in particular to a movable ring pump head assembly for tightening a split plunger rod. Background Art

[0002] The plunger pump is a conventional liquid variable displacement mechanical pump. The plunger rod moves to drive the change of the liquid volume in the plunger cavity, causing the change of the internal and external pressure difference, and absorbs and discharges the liquid to achieve the purpose of transmitting the fluid. In conventional plunger pumps, the plunger rod is fixedly connected to the plunger and cannot be removed as a whole with the pump head. For industries such as health and medicine with high disinfection requirements, thorough disinfection is required when the equipment is shut down or the conveying material is changed. The plunger rod cannot be removed with the pump head, making disinfection difficult.

[0003] The pump body centrally and fixedly installs the plunger rod and sealing components inside the pump body, and the power part drives the plunger rod to reciprocate, thereby absorbing and discharging the transmitted fluid in the integrated fixed pump head structure. In the existing conventional plunger pump structure, when the physical and chemical properties of the fluid transmitted by the plunger pump change with the change of transmission conditions, the integrated plunger pump usually relies on manual removal of the pump head structure fixed to the pump body to maintain the internal mechanisms such as the plunger reciprocating motion mechanism, the volume-variable cavity parts, the sealing components and the distribution structure; in addition, during the exchange process of the plunger and the pump head body, such as disassembly, maintenance, etc., the influence of the change in the accuracy of the plunger friction pair on the flow state of the conveyed fluid is difficult to effectively control, resulting in poor reproducibility of the fluid delivery conditions, which is not conducive to high-precision fluid delivery.

[0004] In the prior art, for example, the U.S. invention patent US8317493B2 discloses a high-precision metering delivery pump, which reduces the contamination retention at the contact position of the plunger during fluid delivery by adjusting the distribution system, switching multiple flow channels, and controlling the speed, and adjusts the flow characteristics to meet the delivery accuracy requirements by controlling the flow rate; in this invention patent, the matching area of ​​the plunger friction pair can be adjusted by a split plunger combination structure, and the plunger structure is adjustably assembled in one by a threaded connection; in this invention patent, when the working area of ​​the plunger pair is adjusted, the cylindrical surface of the plunger pair oil film may be damaged by a non-axial torque, and the adjustment of the flow characteristics of the delivered fluid may not be complete. In addition, in this technical solution, there may be a situation where the residual delivered fluid cannot be completely removed, and it is difficult to adapt to the high-precision fluid delivery requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a movable ring pump head assembly for tightening a split plunger rod, so as to overcome the shortcomings of the prior art such as low energy efficiency utilization of plunger pumps, poor repeatability of fluid delivery conditions, and destruction of fluid delivery conditions due to interchangeable plunger friction pairs.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A live ring pump head assembly for tightening a split plunger rod comprises a pump body and a pump head body, a working chamber is arranged in the pump head body, a plunger mechanism is arranged in the working chamber, a power channel and a power assembly are arranged in the pump body, the power channel accommodates the axial reciprocating motion of the plunger mechanism, the pump body and the pump head body are connected by surface contact, a fastening mechanism is arranged on the pump body, the plunger mechanism comprises a first plunger rod and a second plunger rod, the first plunger rod is slidably connected in the working chamber, the other end of the first plunger rod is threadedly connected to the second plunger rod, the second plunger rod is located in the power channel, a track channel is opened on the matching surface of the pump body, the track channel provides a disassembly and assembly operation space for the first plunger rod to dock with the second plunger rod, and the track channel and the power channel are connected to each other; By arranging the pump body, the pump head body, the first plunger rod, the second plunger rod and the threaded docking groove, the delivery specifications, power distribution and adaptation effects of fluid delivery switching are improved, the flexibility of the power and delivery specification distribution combination of the fluid delivery system is improved, the utilization rate of the pump body and the power component is improved, the design redundancy of the pump body strength and power is reduced, and the energy consumption of fluid delivery is reduced; the ability to reproduce the fluid delivery specifications of the interchangeable parts of the pump head during the fluid delivery process is stabilized, the risk of sudden changes in the critical state of the fluid is reduced, the identity of the shape of the residual delivery fluid in the pump head is improved, and the need for cleaning and disinfection of the pump head of the fluid delivery system is reduced; the fluctuation amplitude of the flow state of the fluid delivered when the specification is changed is reduced, the risk of delivery blockage is reduced, the axial positioning accuracy of the docking position of the segmented plunger rod is improved, the axial movement noise is reduced, and the control accuracy of the change in the volume of micro-fluid delivery when the segmented plungers are interchangeable is improved; the movement accuracy and control accuracy of the closed-loop feedback automatic delivery of the fluid are improved.

[0007] Preferably, a threaded butt joint groove is provided at one end of the second plunger rod opposite to the first plunger rod, and an anti-backlash spring is provided between the first plunger rod and the threaded butt joint groove.

[0008] Preferably, the fastening mechanism comprises a movable ring rod arranged on the pump body, and a clamping assembly is provided at the other end of the movable ring rod, and the clamping assembly fixes the relative positions of the pump body and the pump head body.

[0009] Preferably, a movable ring rod is hinged on the pump body, the pressing assembly includes a pressing piece, the other end of the movable ring rod is threadedly connected to the pressing piece, and the pressing piece presses and fixes the pump head body.

[0010] By providing the guide groove, the guide slider, the pump body and the pump head body, the moving stability and accuracy of the centering positioning of the first plunger rod and the second plunger rod are improved, the disassembly and docking speed can be increased, the disassembly and assembly collision and wear can be reduced, the positioning and movement accuracy of the segmented plunger rod interchangeable docking process is improved, and the matching accuracy of the interchangeable and disassembly of the detachable pump head is improved; the simplicity of the interchangeable operation of the segmented plunger rod and the detachable pump head is improved.

[0011] Preferably, the guiding direction of the guide groove is in the radial direction of the power channel.

[0012] Preferably, a gap is left between the side wall of the power channel and the first plunger rod, and the gap provides an operating space for the first plunger rod to dock with the second plunger rod.

[0013] Preferably, a movable ring groove is provided on the pump head body, the movable ring groove provides an accommodation space for the movable ring rod, the movable ring rod limits the radial movement range of the pump head body relative to the pump body, and the guide groove and the movable ring rod are used for docking and positioning between the first plunger rod and the second plunger rod; By arranging the pump body, pump head body, movable ring rod, clamping piece, guide groove, movable ring groove and guide slide block, the docking stability of the segmented plunger rod is improved, the risk of internal misalignment and power transmission disconnection of interchangeable pump heads is reduced, the disassembly and assembly speed and stability of interchangeable pump head parts are improved, the ease of operation of interchangeable pump heads is improved, and the convenience of status monitoring of interchangeable pump heads is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0015] Figure 1 It is a schematic diagram of the assembly relationship between the pump body and the pump head body; Figure 2 yes Figure 1 A schematic diagram of the main view; Figure 3 yes Figure 1 Schematic diagram of top view; Figure 4 yes Figure 2 A local enlarged schematic diagram of the middle A; Figure 5 It is a schematic diagram of the structure of the pump head body; Figure 6 yes Figure 5 A side view schematic diagram of Figure 7 It is a schematic diagram of the connection relationship between the plunger cavity and the plunger mechanism; Figure 8 It is a schematic diagram of the structure of the pump body; Fig. 9 yes Figure 8 Schematic diagram of top view; Fig.10 yes Figure 8 Schematic cross-sectional view at CC in the middle; Fig.11It is a schematic diagram of the three-dimensional structure of the pump body; Fig.12 is a schematic diagram of the assembly between the first plunger rod and the second plunger rod; Fig.13 yes Fig.12 A schematic cross-sectional view at MM in the middle; Fig.14 yes Fig.13 A local enlarged schematic diagram of the P in the middle; Fig.15 3D schematic diagram of the first plunger rod and the second plunger rod.

[0016] Figure numbers: pump body 10; power channel 11; trajectory channel 12; guide groove 13; hinge groove 14; leak detection hole 15; hinge column hole 16; hinge column 17; live ring rod 18; pressing piece 19; pump head body 40; variable volume cavity 41; plunger cavity 42; live ring groove 43; guide slider 44; distribution hole 45; plunger mechanism 60; first plunger rod 61; second plunger rod 62; threaded docking groove 63; anti-backlash spring 64. DETAILED DESCRIPTION

[0017] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0018] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] Embodiment 1 See attached Figure 1 To Attachment Fig.15 As shown, the present invention provides a movable ring pump head assembly for tightening a split plunger rod, comprising a pump body 10 and a pump head body 40, wherein a working chamber is provided in the pump head body 40, a plunger mechanism 60 is provided in the working chamber, a power channel 11 and a power assembly are provided in the pump body 10, the power channel 11 accommodates the axial reciprocating motion of the plunger mechanism 60, and the power assembly is connected to the plunger mechanism 60 in a power manner; The positions of the left end surface of the pump body 10 and the right end surface of the pump head body 40 correspond to each other, the pump body 10 and the pump head body 40 are connected by surface contact, the pump body 10 and the pump head body 40 are positioned and matched in an end-to-end butt manner, a fastening mechanism is provided on the pump body 10, the fastening mechanism is used to compress the contact and matching surface between the pump body 10 and the pump head body 40, the plunger mechanism 60 has a first plunger rod 61 and a second plunger rod 62, the first plunger rod 61 is slidably connected in the working chamber, the other end of the first plunger rod 61 is threadedly connected to the second plunger rod 62, the second plunger rod 62 is located in the power channel 11, and the power component is connected to the second plunger rod 62; a track channel 12 is opened on the contact connection surface of the pump body 10 and the pump head body 40, the track channel 12 and the power channel 11 are connected to each other, and the track channel 12 provides a disassembly and assembly operation space for the first plunger rod 61 to connect with the second plunger rod 62; A variable volume chamber 41 is provided in the pump head body 40, and fluid input and output channels are provided in the side walls of the variable volume chamber 41. The fluid input and output channels flow in and out of the conveyed fluid through the pipelines provided on the distribution hole 45. A plunger chamber 42 is provided at the right end of the variable volume chamber 41. The plunger chamber 42 is communicated with the variable volume chamber 41, and the right end of the plunger chamber 42 is slidably connected to the first plunger rod 61. A power assembly is provided in the pump body 10, and the power assembly drives the plunger mechanism 60 to slide left and right in the plunger chamber 42, thereby driving the pressure in the variable volume chamber 41 to increase and decrease to complete the suction and discharge actions of the conveyed fluid. By setting a surface contact matching connection between the pump body 10 and the pump head body 40, and transmitting the fluid delivery power to the first plunger rod 61 through the second plunger rod 62, the first plunger rod 61 can be driven to be positioned to the position where it is docked with the second plunger rod 62 through the pump head body 40 sliding at the contact matching surface on the pump body 10 under the surface contact fixation between the pump body 10 and the pump head body 40. After the first plunger rod 61 and the second plunger rod 62 are aligned, the track channel 12 provides an operating space for rotating the first plunger rod 61, so that the first plunger rod 61 is rotated relative to the first plunger rod 61, so that the first plunger rod 61 enters the threaded docking groove 63 and completes docking with the second plunger rod 62, and the first plunger rod 61 can rotate relatively in the plunger cavity 42. After the first plunger rod 61 and the second plunger rod 62 are positioned and docked, the first plunger rod 61 no longer continues to rotate relative to the second plunger rod 62; The pump body 10 and the pump head body 40 can be detachably assembled and disassembled into a plunger pump as a whole and pump head bodies 40 of different specifications can be switched to be used with the pump body 10. Pump heads of different delivery specifications can be switched on the same pump body power assembly, thereby switching different fluid delivery conditions and delivery specifications. The same pump body power assembly is used to provide reciprocating power for switching different pump heads, which can reduce the material cost of switching the specifications of the fluid delivery pump head. At the same time, the pump body and the power assembly as a whole are used as basic components, and the pump head is used as an interchangeable part for disassembly and assembly; By providing the pump body 10, the pump head body 40, the first plunger rod 61 and the second plunger rod 62, the delivery specifications, power distribution and adaptation effects of the fluid delivery switching are improved, the risks of overload damage and insufficient power of the fluid delivery system pipeline are reduced, the adaptability of the fluid delivery system to changes in fluid parameters is improved, the flexibility of the power and delivery specification distribution combination of the fluid delivery system is improved, the safety and delivery efficiency of the fluid delivery system are improved, the utilization rate of the pump body and power components is improved, the design redundancy of the pump body strength and power is reduced, and the energy consumption of fluid delivery is reduced; the layout and control accuracy of the variable specification delivery fluid system are improved; Improve the interchangeability of pump body parts, improve the process performance and material management quality of pump body disassembly and assembly interchangeable parts, reduce the modification cost of the existing conveying system, reduce the impact on the assembly accuracy of the pump head interchangeable parts during the disassembly and assembly interchangeable process, stabilize the ability of the pump head interchangeable parts to reproduce the fluid conveying specifications during the fluid conveying process, reduce the impact of the flow state of the conveyed fluid on the change of the conveying specifications, can switch multiple fluids on the same pump body and power assembly for conveying, and the same or similar fluids can be switched on the pump head interchangeable parts of the allowable conveying specifications on the pump body and power assembly with the same conveying power, reduce the impact of the flow state of the conveyed fluid on the switching of the conveying specifications, stabilize the stability of the conveying fluid's own state, reduce the risk of the fluid producing a critical state mutation, improve the convenience of regulating the conveying specifications and flow characteristics of the fluid conveying system, improve the identity of the conveying fluid shape remaining in the pump head, reduce the need for cleaning and disinfection of the fluid conveying system pump head, reduce the possibility of leakage of the conveying fluid in the conveying system, and improve the convenience of regulating the conveying of special fluids; Improve the reproducibility of the delivery accuracy of the pump head interchangeable parts, improve the delivery specification control accuracy of the switching layout fluid delivery, reduce the fluctuation amplitude of the flow state of the specification-changing delivery fluid, reduce the probability of solid phase precipitation due to critical changes in the multi-phase mixed delivery fluid, reduce the risk of delivery blockage, reduce the change of the gas-dissolved state of the multi-phase mixed delivery fluid, improve the stability of the plunger auxiliary oil film characteristics of the pump head interchangeable parts, reduce the possibility of cavitation state in the fluid delivery system, and reduce the risk of sudden changes in the volumetric efficiency of the interchangeable pump head, and improve the service life and delivery safety of the delivery system; In addition, by providing the second plunger rod 62, the first plunger rod 61 and the threaded docking groove 63, after the first plunger rod 61 is docked and fixed in the threaded docking groove 63, the axial movement transmitted by the second plunger rod 62 can be driven by the first plunger rod 61 to drive the axial sliding of the plunger friction pair, and the distance of the friction sliding of the first plunger rod 61 in the side wall of the plunger cavity 42 is fixed after the first plunger rod 61 knob enters the threaded docking groove 63 and the docking is completed, and the clearance between the first plunger rod 61 and the side wall of the threaded docking groove 63 is reduced by the anti-backlash spring 64 provided between the right end wall of the threaded docking groove 63 and the first plunger rod 61, thereby preventing the first plunger rod 61 from axially moving relative to the second plunger rod 62 in the threaded docking groove 63, and at the same time preventing the first plunger rod 61 from relative circumferential rotation in the side wall of the plunger cavity 42; In addition, a plurality of power channels 11 may be provided in the pump body 10 to set a plurality of second plunger rods 62, and a plurality of plunger cavities 42 corresponding to the positions of the power channels 11 may be provided in the pump head body 40 to set a plurality of first plunger rods 61, and a plurality of track channels 12 may be synchronously provided to dock a plurality of plunger rod segments, so that a plurality of plunger assemblies may be synchronously docked and interchanged on the same pump head and pump body as a whole, thereby realizing the regulation and formation of more plunger delivery conditions in the pump head interchangeable use structure; By tightening the gap through the anti-backlash spring 64, the possibility of axial movement of the plunger can be reduced, the axial positioning accuracy of the segmented plunger rod docking position is improved, the axial shaking of the segmented plunger rod is reduced, and the axial movement noise is reduced. At the same time, the stability of the axial bearing state of the segmented plunger rod is improved, and the piston pair is prevented from shaking in the axial gap due to the liquid surface tension or the pressure of the conveying fluid. The volume change of the plunger cavity during micro-fluid conveying can be reduced, the volumetric efficiency change of the micro-fluid conveying process can be reduced, and the control accuracy of the volume change of micro-fluid conveying when the segmented plungers are interchangeable can be improved; in addition, the feedback effect of the power component drive control can be improved under the feedback information of the conveying power end such as the plunger cavity, and the feedback control adaptability of the automated fluid conveying can be adapted, which is convenient for improving the movement accuracy and control accuracy of the closed-loop feedback automatic fluid conveying.

[0021] See attached Figure 7 and attached Fig.10 As shown, a guide slider 44 is fixedly connected to the right end surface of the pump head body 40, and a guide groove 13 is provided on the left end surface of the pump body 10. The guide groove 13 cooperates with the guide slider 44, and the guide groove 13 guides the movement trajectory of the first plunger rod 61 in the trajectory channel 12 for assembly and disassembly; when the plunger mechanism 60 is docked and installed between the pump body 10 and the pump head body 40, the pump body 10 slides in the radial direction of the plunger mechanism 60 through the guide groove 13 to guide the guide slider 44 and the pump head body 40 to slide toward the power channel 11, and the guide slider 44 is guided by the guide groove 13 to slide downward in the guide groove 13, thereby driving the pump head body 40 and the plunger mechanism 60 to stop as a whole at the docking position at the left end of the power channel 11; By providing the guide groove 13, the guide slider 44, the pump body 10 and the pump head body 40, the sliding state of the guide slider 44 can be stabilized under the guiding action of the guide groove 13, the movement stability and accuracy of the centering positioning of the first plunger rod 61 and the second plunger rod 62 can be improved, the disassembly and docking speed can be improved, and at the same time, the disassembly and assembly collision and wear can be reduced, the surface damage of the contact mating surface between the pump body 10 and the pump head body 40 can be reduced, the positioning and movement accuracy of the segmented plunger rod in the interchangeable docking process can be improved, and the matching accuracy of the interchangeable and disassembly of the detachable pump head can be improved; the convenience of the interchangeable operation of the segmented plunger rod and the detachable pump head is improved, and the interchangeable service life and safety of the detachable pump head are improved.

[0022] A track channel 12 is provided on the left end surface of the pump body 10. When the plunger mechanism 60 follows the pump head body 40 to dock in the power channel 11 in the radial vertical direction of the power channel 11, the track channel 12 accommodates the docking movement track of the plunger mechanism 60 at the left end of the pump body 10; the track channel 12 is connected to the power channel 11, and the track channel 12 provides a disassembly and assembly operation space for the first plunger rod 61 to dock with the second plunger rod 62; when the guide slider 44 slides downward relative to the pump body 10 in the guide groove 13 to the maximum guide sliding position of the guide groove 13, the plunger mechanism 60 completes the docking between the plunger cavity 42 and the power channel 11, thereby aligning the first plunger rod 61 and the second plunger rod 62; See attached Figures 1 to 4 , Attachment Figure 6 , Attachment Figure 7 And attached Fig.10 As shown, a hinge groove 14 is provided on the side of the pump body 10, and a hinge column 17 is rotatably connected between the two side walls of the hinge groove 14. A hinge column hole 16 is provided on the pump body 10, and the hinge column 17 is arranged in the hinge groove 14 through the hinge column hole 16. One end of the hinge column 17 located in the hinge groove 14 is rotatably connected to a live ring rod 18, and the other end of the live ring rod 18 is rotatably connected to a pressing piece 19 through a threaded rotation. The pump head body 40 is located between the pressing piece 19 and the pump body 10, and the live ring rod 18 is hinged to the pump body 10 through the hinge column 17; The fastening mechanism includes a movable ring rod 18 disposed on the pump body 10, and a clamping assembly is provided at the other end of the movable ring rod 18, and the clamping assembly fixes the relative position of the pump body 10 and the pump head body 40; the clamping assembly includes a clamping member 19, and the other end of the movable ring rod 18 is threadedly connected to the clamping member 19, and the clamping member 19 clamps and fixes the surface contact connection; See attached Figure 1 To Attachment Figure 4 , Attachment Fig.10 To Attachment Fig.14 As shown, a live ring groove 43 is provided on the pump head body 40, and the live ring groove 43 provides a space for accommodating the live ring rod 18. The live ring rod 18 limits the radial movement range of the pump head body 40 relative to the pump body 10. The guide groove 13 and the live ring rod 18 are used for docking and positioning between the first plunger rod 61 and the anti-backlash spring 64. After the first plunger rod 61 and the second plunger rod 62 are aligned and positioned by adjusting the relative position of the pump head body 40 and the pump body 10, the centering state between the second plunger rod 62 and the first plunger rod 61 is fixed under the pressing action of the pressing member 19; The free rotation plane of the movable ring rod 18 hinged on the pump body 10 is perpendicular to the left end face of the pump body 10 and the right end face of the pump head body 40. After the movable ring rod 18 is hinged and rotated around the hinge column 17 toward the pump head body 40, the movable ring rod 18 is accommodated in the movable ring groove 43. The length of the movable ring rod 18 in the axial direction of the plunger mechanism 60 is greater than the movable ring groove 43; the pressing piece 19 threadedly connected to the left end of the movable ring rod 18 moves to the right after forward rotation, thereby providing a rightward extrusion force on the pump head body 40, thereby increasing the left end face of the pump body 10 and the right end face of the pump head body 40. The friction between them and the extrusion force provided by the clamping piece 19 maintains a stable fit between the right end face of the pump head body 40 and the left end face of the pump body 10; when the clamping piece 19 is reversed on the movable ring rod 18, the clamping piece 19 moves on the movable ring rod 18 in a direction relatively away from the hinge column 17, thereby releasing the extrusion force on the pump head body 40, and after the movable ring rod 18 is rotated on the hinge column 17 in the opposite direction away from the pump head body 40, the movable ring rod 18 is disengaged from the accommodation of the movable ring groove 43, thereby releasing the freedom of the pump head body 40 to slide on the left end face of the pump body 10.

[0023] By setting the pump body 10, the pump head body 40, the movable ring rod 18, the clamping piece 19, the guide groove 13, the movable ring groove 43 and the guide slider 44, the pump head body 40 slides in the guide groove 13 through the guide slider 44 to adjust the position on the contact matching surface relative to the pump body 10, the pump head body 40 drives the first plunger rod 61 to move in the track channel 12 into the power channel 11 to dock with the second plunger rod 62 for axis centering positioning, the clamping piece 19 clamps the surface contact connection between the pump head body 40 and the pump body 10, and under the setting of the movable ring groove 43, the clamping piece 19 relatively increases the contact surface between the pump head body 40 The compact structure can improve the stability of the first plunger rod 61 and the second plunger rod 62 in the centering state when the pressing member 19 presses the pump head body 40 to fix the centering state of the first plunger rod 61 and the second plunger rod 62, reduce the wear of the segmented interchangeable disassembly and assembly of the plunger rod, improve the centering state maintenance accuracy and docking state maintenance effect, improve the docking stability of the segmented plunger rod, reduce the risk of internal misalignment and power transmission disconnection of the interchangeable pump head, improve the disassembly and assembly speed and stability of the pump head interchangeable parts, and improve the ease of operation of the interchangeable use of the pump head; at the same time, improve the accuracy of the docking positioning of the segmented plunger rod and the convenience of operation; At the same time, the internal power docking condition can be judged according to the relative state between the movable ring rod 18, the clamping piece 19 and the pump head body 40, and the leakage condition of the volume-variable cavity can be checked by connecting the leak detection hole 15 provided on the pump head body 40. The working state of the interchangeable pump head can be grasped in time without disassembly, thereby improving the convenience of status monitoring of the interchangeable pump head.

[0024] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes made by a person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A live ring pump head assembly for tightening a split plunger rod, comprising a pump body (10) and a pump head body (40), wherein the pump head body (40) is provided with a working chamber, wherein a plunger mechanism (60) is provided in the working chamber, wherein a power channel (11) and a power assembly are provided in the pump body (10), wherein the power channel (11) accommodates the axial reciprocating motion of the plunger mechanism (60), and wherein: The pump body (10) and the pump head body (40) are connected by surface contact. A fastening mechanism is provided on the pump body (10). The plunger mechanism (60) comprises a first plunger rod (61) and a second plunger rod (62). The first plunger rod (61) is slidably connected in the working chamber. The other end of the first plunger rod (61) is threadedly connected to the second plunger rod (62). The second plunger rod (62) is located in the power channel (11). A track channel (12) is provided on the pump body (10). The track channel (12) provides a disassembly and assembly operation space for the first plunger rod (61) to dock with the second plunger rod (62). The track channel (12) and the power channel (11) are connected to each other.

2. A movable ring pump head assembly for tightening a split plunger rod as claimed in claim 1, characterized in that: A threaded butt joint groove (63) is provided at one end of the second plunger rod (62) opposite to the first plunger rod (61), and an anti-backlash spring (64) is provided between the first plunger rod (61) and the threaded butt joint groove (63).

3. A movable ring pump head assembly for tightening a split plunger rod as claimed in any one of claims 1 to 2, characterized in that: The fastening mechanism comprises a movable ring rod (18) arranged on the pump body (10), and a clamping assembly is provided at the other end of the movable ring rod (18), wherein the clamping assembly fixes the relative position of the pump body (10) and the pump head body (40).

4. A movable ring pump head assembly for tightening a split plunger rod as claimed in claim 3, characterized in that: A movable ring rod (18) is hinged on the pump body (10), and the clamping assembly comprises a clamping piece (19). The other end of the movable ring rod (18) is threadedly connected to the clamping piece (19), and the clamping piece (19) clamps and fixes the pump head body (40).

5. A movable ring pump head assembly for tightening a split plunger rod as claimed in claim 3, characterized in that: The pump head body (40) is provided with a guide slider (44), and the pump body (10) is provided with a guide groove (13), the guide slider (44) being slidably connected in the guide groove (13), and the guide groove (13) guides the movement of the first plunger rod (61) in the track channel (12) during assembly and disassembly.

6. A movable ring pump head assembly for tightening a split plunger rod as claimed in claim 5, characterized in that: The guiding direction of the guide groove (13) is in the radial direction of the power channel (11).

7. A movable ring pump head assembly for tightening a split plunger rod as claimed in claim 5, characterized in that: The pump head body (40) is provided with a movable ring groove (43), the movable ring groove (43) provides a receiving space for the movable ring rod (18), the movable ring rod (18) limits the radial movement range of the pump head body (40) relative to the pump body (10), and the guide groove (13) and the movable ring rod (18) are used for docking and positioning between the first plunger rod (61) and the second plunger rod (62).

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