Plug-in pump head assembly for screwing split plunger rod

Abstract

The invention belongs to the technical field of plunger pumps, and provides a plug-in pump head assembly for screwing a split plunger rod. The plunger pump comprises a pump head and a pump body, plunger rods are arranged in the pump head and the pump body, the pump body comprises a first pump body and a second pump body which are connected, the first pump body and the second pump body are mutually nested in the axial direction, and a guide structure is arranged on the contact face of the first pump body and the second pump body. The first pump body and the second pump body are mutually nested, so that the connection strength of the first pump body and the second pump body is improved; the joint of the first pump body and the second pump body is changed, the common radial joint of the split type pump body is changed into the axial joint, medium leakage in the pump body is avoided, the situation that an existing plunger pump is usually subjected to abnormal load and impact in the radial direction is avoided, through the arrangement, the abnormal impact and vibration bearing capacity of the pump body can be improved, and the service life of the pump body is prolonged. And the assembly of a large-structure or heavy-weight pump head is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger pumps, and provides a plug-in pump head assembly with a screwed and split plunger rod. Background Art

[0002] Due to the technical development of plunger pumps, plunger pumps have the advantages of high rated pressure, compact structure, high efficiency, and convenient flow regulation, and replace stainless steel gear pumps or vane pumps to provide more suitable production equipment for the food, pharmaceutical, and biopharmaceutical industries. However, most of the existing plunger pumps have an integral plunger rod and a pump head connected by non-detachable connections such as welding, resulting in high manufacturing costs and difficult maintenance of the existing plunger pumps, and cannot meet the sanitary requirements and diverse flow requirements of the food, pharmaceutical, and biopharmaceutical industries. For this reason, for the above-mentioned existing problems, a detachable plunger pump is needed to address the above problems. The prior art CN213235340U is a double plunger rod pump, and the device includes: a fixed base, a pump body, a camshaft, a first cam, a second cam, a motor, a synchronous pulley device, and a pump head; the hollow pump body is arranged on the fixed base, the pump head is arranged at one end of the pump body, the pump head includes a first pump head and a second pump head, a guide rail is arranged inside the pump body, and a first plunger rod and a second plunger rod are arranged in parallel on the guide rail; a first plunger head is arranged at the opposite end of the first plunger rod, a second plunger head is arranged at the opposite end of the second plunger rod, a first bearing is arranged at the opposite end of the first plunger rod, and a second bearing is arranged at the opposite end of the second plunger rod. The prior art adopts a split plunger rod, and a wear unit that is easy to remove is arranged at the vulnerable part of the plunger rod. The inventor believes that there is great room for improvement in the prior art. Summary of the Invention

[0003] The purpose of the present invention is to make the pump head and the matching plunger rod replaceable parts, simplify the assembly steps, reduce the time cost of disinfection and cleaning, and improve the sealing performance of the split pump body to avoid the leakage of the medium inside the plunger pump. Secondly, improve the ability of the split pump body to bear radial loads, and be able to assemble pump heads with large weights and large structures; improve the ability of the pump body to withstand abnormal impacts and vibrations, and improve the structural strength of the split pump body. For this reason, the present invention provides a plug-in pump head assembly with a screwed and split plunger rod, including a pump head and a pump body, a plunger rod is arranged inside the pump head and the pump body, the pump body includes a connected first pump body and a second pump body, the first pump body and the second pump body are nested with each other in the axial direction, and a guiding structure is arranged on the contact surface of the first pump body and the second pump body. The first pump body and the second pump body are nested with each other to improve the connection strength between the first pump body and the second pump body; change the joint of the first pump body and the second pump body, and change the usual radial joint of the split pump body into an axial joint, so as to avoid the leakage of the medium inside the pump due to gravity, and the existing plunger pumps are usually subjected to abnormal loads and impacts in the radial direction. Through the above settings, the pump body joint in the radial direction is cancelled, and the ability of the pump body to withstand radial abnormal impacts and vibrations can be improved; secondly, it is beneficial to assemble pump heads with large structures or large weights.

[0004] Preferably, a first elastic body is provided between the first pump body and the second pump body. One end of the first elastic body abuts against the first pump body, and the other end of the first elastic body abuts against the second pump body. Since the first pump body and the second pump body are nested with each other, the first elastic body is extruded during the assembly process of the first pump body and the second pump body, and then fixed by a fastener. The first elastic body can reduce the axial impact force when the first pump body and the second pump body are positioned during assembly, and the impact force transmitted along the second pump body during operation, avoiding damage to the power mechanism of the plunger pump; during the disassembly process, since there is a lubricating medium in the plunger pump, the mutual nesting of the first pump body or the second pump body is not conducive to clamping and withdrawing. The first elastic body can quickly eject the first pump body or the second pump body, which is beneficial to quickly disassemble the first pump body or the second pump body. Secondly, when the first pump body is connected to a pump head with a large weight or a large structure, the first elastic body can assist in pushing out the first pump body, reducing the required thrust for disassembly and reducing the labor intensity.

[0005] Preferably, the plug-in pump head assembly for screwing the split plunger rod further includes a fastener. The fastener extends in the radial direction of the pump body, and the fastener connects the first pump body and the second pump body. Since the first pump body and the second pump body are connected in a nested manner, the joint of the first pump body and the second pump body is a polygon around the axis of the pump body. By using a radial fastener, the relative axial movement between the first pump body and the second pump body can be avoided, and the ability of the pump body to bear axial loads or impacts can be improved.

[0006] Preferably, the guiding structure includes that the cross-section of the first pump body in the radial direction is a polygon, and the second pump body is provided with a matching polygonal cavity. The polygon has multiple edges, and the edges have a guiding effect, which is beneficial to the nesting of the first pump body and the second pump body. At the same time, it can avoid the relative rotation of the first pump body and the second pump body during the installation process, which is beneficial to the rapid positioning of the connection holes of the fasteners; the polygonal pump body is beneficial to holding and handling. When the plunger pump is attached with an oily medium, it is not easy to slip off, facilitating manual rapid disassembly, assembly, disinfection and washing.

[0007] Preferably, the plunger rod includes a first plunger section and a second plunger section. The first plunger section and the second plunger section are connected by a thread. Both the first plunger section and the second plunger section move inside the pump body. The plunger rod further includes a third plunger section which is a rotating body. A high-pressure sealing structure is provided around the third plunger section. One end of the third plunger section moves inside the pump head and the other end moves inside the pump body. The first plunger section is connected to the power mechanism of the plunger pump. The third plunger section is close to the pump head. The threaded connection is a rigid connection that can withstand various loads during the reciprocating movement of the plunger rod, and the axial relative positions of the individual rods of the split plunger rod will not shift, ensuring that the stroke of the plunger rod does not change, maintaining the reliable volumetric efficiency of the plunger pump and avoiding abnormal axial vibration or impact. During the assembly and disassembly process, the third plunger section and the second plunger section are relatively fixed, so rotation is also required. The third plunger section is made into a rotating body to ensure that the sealing performance between the plunger rod and the pump head does not change during the assembly and disassembly process.

[0008] Preferably, the threaded connection includes a threaded hole and a threaded rod. A second elastic body is provided inside the threaded hole. One end of the second elastic body abuts against the bottom of the threaded hole and the other end abuts against the end of the threaded rod. The second elastic body is used to compress the thread between the threaded rod and the threaded hole, reducing the wear caused by the axial movement of the threaded rod to the threaded hole. The second elastic body can absorb the axial impact transmitted from the second plunger section to the first plunger section, preventing the power mechanism of the plunger pump from being damaged due to axial impact during the reciprocating movement of the plunger rod.

[0009] Preferably, the pump head is connected to the first pump body. A sealing groove is provided on the connection surface between the pump head and the pump body, and a high-pressure sealing structure is provided in the sealing groove. There is a joint between the pump head and the first pump body. One end of the third plunger section moves inside the pump head and the other end moves inside the pump body, which is likely to carry out liquid. The high-pressure sealing structure is provided to ensure the sealing between the pump head and the first pump body, and the high-pressure sealing structure cooperates with the third plunger section to reduce the wear of the joint between the third plunger section and the pump head and the first pump body during the reciprocating movement of the third plunger section.

[0010] Preferably, the high-pressure sealing structure includes a first sealing shaft sleeve and a sealing pressure ring. One end of the first sealing shaft sleeve abuts against the first pump body, and the other end of the sealing pressure ring abuts against the pump head. The first sealing shaft sleeve is sleeved outside the third plunger section. The first sealing shaft sleeve is in direct contact with the third plunger section, reducing the wear of the third plunger section during the reciprocating movement. When the pump head presses the sealing pressure ring, the sealing pressure ring presses the first sealing shaft sleeve, causing the first sealing shaft sleeve and the third plunger section to be pressed against each other, improving the sealing effect of the high-pressure sealing structure.

[0011] Preferably, both the first plunger section and the second plunger section are provided with magnets coaxial with themselves, and the first plunger section and the second plunger section are magnetically connected by magnets.

[0012] Preferably, the magnet includes a first magnet. A first mounting hole is provided on the end face of the first plunger section close to the second plunger section, and the first magnet is arranged in the first mounting hole. The magnet further includes a second magnet. A second mounting hole is provided on the end face of the second plunger section close to the first plunger section, and the second magnet is arranged in the second mounting hole. The first magnet and the second magnet can be separated by the second elastic body.

[0013] The present invention provides a plug-in pump head assembly with a screwed and split plunger rod, making the pump head and the matching plunger rod replaceable parts, simplifying the assembly steps, reducing the time cost of disinfection and cleaning, and improving the sealing performance of the split pump body to avoid the leakage of the medium in the plunger pump; improving the ability of the split pump body to bear radial loads and enabling the assembly of pump heads with large weights and large structures; improving the ability of the pump body to withstand abnormal impacts and vibrations, enhancing the structural strength of the split pump body, and having the following beneficial effects: the first pump body and the second pump body are nested with each other to improve the connection strength between the first pump body and the second pump body; changing the joint of the first pump body and the second pump body, converting the usual radial joint of the split pump body into an axial joint to avoid the leakage of the medium in the pump body, and the existing plunger pumps are usually subject to abnormal loads and impacts in the radial direction. Through the above settings, the ability of the pump body to withstand abnormal impacts and vibrations can be improved; secondly, it is beneficial to assemble pump heads with large structures or large weights. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained by extension based on the provided drawings without creative efforts.

[0015] Figure 1 It is a schematic structural diagram of the plunger pump of the present invention; Figure 2 It is a disassembled schematic diagram of the plunger pump of the present invention; Figure 3 It is a schematic cross-sectional structural diagram of the plunger pump of the present invention; Figure 4 For the present invention Figure 3 The partial enlarged view at M; Figure 5 It is a schematic structural diagram of the plunger rod of the present invention; Figure 6 It is a disassembled schematic diagram of the plunger rod of the present invention; Figure 7Schematic cross-sectional structure diagram of the plunger rod according to the second embodiment of the present invention.

[0016] Explanation of reference numerals: 1 First pump body; 2 Second pump body; 3 Pump head; 4 Plunger rod; 401 First plunger section; 402 Second plunger section; 403 Third plunger section; 404 Threaded rod; 405 Second elastic body; 406 Threaded hole; 5 Fastener; 6 First elastic body; 7 Sealing pressure ring; 8 First sealing shaft sleeve. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Embodiment 1 Combined with Figure 1 、 Figure 2 and Figure 3 As shown, an assembled plug-in pump head 3 of a screwed split plunger rod 4 includes a pump head 3 and a pump body. A plunger rod 4 is provided inside the pump head 3 and the pump body. The pump body includes a connected first pump body 1 and a second pump body 2. The first pump body 1 and the second pump body 2 are nested with each other in the axial direction. A guiding structure is provided on the contact surface between the first pump body 1 and the second pump body 2. The mutual nesting of the first pump body 1 and the second pump body 2 improves the connection strength between the first pump body 1 and the second pump body 2; by changing the joint between the first pump body 1 and the second pump body 2, the usual radial joint of the split pump body is changed to an axial joint, avoiding the leakage of the medium inside the pump body, and the abnormal loads and impacts usually received by the existing plunger pumps in the radial direction. Through the above settings, the ability of the pump body to withstand abnormal impacts and vibrations can be improved; secondly, it is beneficial to assemble a large structure or a large-weight pump head 3.

[0019] As Figure 3 shown, a first elastic body 6 is provided between the first pump body 1 and the second pump body 2. One end of the first elastic body 6 abuts against the first pump body 1, and the other end of the first elastic body 6 abuts against the second pump body 2. Since the first pump body 1 and the second pump body 2 are nested with each other, the first elastic body 6 is squeezed during the assembly process of the first pump body 1 and the second pump body 2, and then fixed by the fastener 5. The first elastic body 6 can reduce the axial impact force between the first pump body 1 and the second pump body 2 during assembly and avoid damaging the power mechanism of the plunger pump; during the disassembly process, due to the presence of lubricating medium inside the plunger pump, the mutual nesting of the first pump body 1 or the second pump body 2 is not conducive to clamping and withdrawing. The first elastic body 6 can quickly eject the first pump body 1 or the second pump body 2, which is beneficial to quickly disassemble the first pump body 1 or the second pump body 2. Secondly, when the first pump body 1 is connected to a large-weight or large-structure pump head 3, the first elastic body 6 can assist in pushing out the first pump body 1, reducing the required thrust for disassembly and reducing the labor intensity.

[0020] AsFigure 1 and Figure 2 As shown in Figure 2 , the plug-in pump head 3 assembly for screwing the split plunger rod 4 further includes a fastener 5. The fastener 5 extends in the radial direction of the pump body, and the fastener 5 connects the first pump body 1 and the second pump body 2. Since the first pump body 1 and the second pump body 2 are connected in a nested manner, the joint of the first pump body 1 and the second pump body 2 is a polygon around the axis of the pump body. By using the radial fastener 5, the relative axial movement between the first pump body 1 and the second pump body 2 can be avoided, and the ability of the pump body to bear axial loads or impacts can be improved.

[0021] As Figure 2 shown in Figure 2 , the guiding structure includes that the cross-section of the first pump body 1 in the radial direction is a polygon, and the second pump body 2 is provided with a matching polygonal cavity. The polygon has multiple edges, and the edges have a guiding effect, which is beneficial to the nesting of the first pump body 1 and the second pump body 2. At the same time, during the installation process, the relative rotation between the first pump body 1 and the second pump body 2 can be avoided, which is beneficial to the rapid positioning of the connection holes of the fastener 5.

[0022] As Figure 5 and Figure 6 shown in Figure 5 and Figure 6 , the plunger rod 4 includes a first plunger section 401 and a second plunger section 402. The first plunger section 401 and the second plunger section 402 are connected by threads. Both the first plunger section 401 and the second plunger section 402 move inside the pump body. The plunger rod 4 further includes a third plunger section 403. The third plunger section 403 is a rotating body, and a high-pressure sealing structure is provided around the third plunger section 403. One end of the third plunger section 403 moves inside the pump head 3, and the other end of the third plunger section 403 moves inside the pump body. The first plunger section 401 is connected to the power mechanism of the plunger pump, and the third plunger section 403 is close to the pump head 3. The third plunger section 403 can be made of a material adapted to the fluid transported by the plunger pump to ensure the service life of the plunger rod 4. The threaded connection is a rigid connection, which can withstand the loads in all directions during the reciprocating movement of the plunger rod 4, and the axial relative positions of the individual rods of the split plunger rod 4 will not shift, which can ensure that the stroke of the plunger rod 4 does not change, maintain the reliable volumetric efficiency of the plunger pump, and avoid abnormal axial vibration or impact; during the assembly and disassembly process, the third plunger section 403 and the second plunger section 402 are relatively fixed, so rotation is also required. The third plunger section 403 is made into a rotating body, which can ensure that the sealing performance between the plunger rod 4 and the pump head 3 does not change during the assembly and disassembly process.

[0023] As Figure 6As shown, the threaded connection includes a threaded hole 406 and a threaded rod 404. Inside the threaded hole 406, there is a second elastic body 405. One end of the second elastic body 405 abuts against the bottom of the threaded hole 406, and the other end of the second elastic body 405 abuts against the end of the threaded rod 404. The second elastic body 405 is used to compress the thread between the threaded rod 404 and the threaded hole 406, reducing the wear caused by the axial movement of the threaded rod 404 to the threaded hole 406; the second elastic body 405 can absorb the axial impact transmitted from the second plunger section 402 to the first plunger section 401, and the first elastic body can absorb the axial impact transmitted from the pump head 3 to the second pump body 2, preventing the power mechanism of the plunger pump from being damaged due to the axial impact during the reciprocating movement of the plunger rod 4.

[0024] Combined Figure 3 and Figure 4 As shown, the pump head 3 is connected to the first pump body 1. A sealing groove is provided on the connection surface between the pump head 3 and the pump body, and a high-pressure sealing structure is provided in the sealing groove. The high-pressure sealing structure includes a first sealing shaft sleeve 8 and a sealing pressure ring 7. One end of the first sealing shaft sleeve 8 abuts against the first pump body 1, and the other end of the sealing pressure ring 7 abuts against the pump head 3. The third plunger section 403 is sleeved with the first sealing shaft sleeve 8.

[0025] There is a joint between the pump head 3 and the first pump body 1. One end of the third plunger section 403 moves inside the pump head 3, and the other end of the third plunger section 403 moves inside the pump body, which is likely to carry out liquid. The high-pressure sealing structure is provided to ensure the sealing performance between the pump head 3 and the first pump body 1, and the cooperation between the high-pressure sealing structure and the third plunger section 403 reduces the wear of the joint between the third plunger section 403 and the pump head 3 and the first pump body 1 during the reciprocating movement of the third plunger section 403. The first sealing shaft sleeve 8 is in direct contact with the third plunger section 403, reducing the wear of the third plunger section 403 during the reciprocating movement; the sealing pressure ring 7 abuts against the pump head 3. When the pump head 3 squeezes the sealing pressure ring 7, the first sealing shaft sleeve 8 is squeezed, making the first sealing shaft sleeve 8 and the third plunger section 403 squeeze and contact each other, improving the sealing effect of the high-pressure sealing structure.

[0026] The high-pressure sealing structure further includes a second sealing shaft sleeve. A groove is provided on one side of the first sealing shaft sleeve 8 close to the sealing pressure ring 7, and the sealing pressure ring 7 squeezes and fixes the second sealing shaft sleeve in the groove of the first sealing shaft sleeve 8.

[0027] As shown in the figure, there is an annular cavity inside the second sealing shaft sleeve. A sealing ring is provided in the annular cavity. The side of the second sealing shaft sleeve that cooperates with the plunger rod is provided with first threads, and the side of the second sealing shaft sleeve that cooperates with the sealing pressure ring 7 is provided with second threads.

[0028] Through the above-mentioned arrangement, the second sealing sleeve is in contact with the plunger rod, and cooperates with the first sealing sleeve 8 to further improve the sealing performance of the high-pressure sealing structure; the second sealing sleeve is used to fix the sealing ring to prevent the reciprocating motion of the plunger rod from causing the sealing ring to move on the surface of the plunger rod; since the second sealing sleeve is clamped and fixed by the sealing pressure ring 7 and the first sealing sleeve 8, the sealing performance of the matching surface between the second sealing sleeve and the plunger rod depends on the machining accuracy of the radial dimension of the second sealing sleeve, and the first tooth pattern is used to form a liquid storage space, which can block the liquid from flowing out along the surface of the plunger rod, improve the sealing performance between the second sealing sleeve and the plunger rod, and reduce the machining accuracy of the radial dimension of the second sealing sleeve; since the second sealing sleeve is clamped and fixed by the sealing pressure ring 7 and the first sealing sleeve 8, the second sealing sleeve is squeezed by the sealing pressure ring 7, and the second tooth pattern is set on the matching surface of the second sealing sleeve and the sealing pressure ring 7, which is conducive to the expansion of the second sealing sleeve and prevents the second sealing sleeve from being damaged and failed due to excessive preload force of the fastener.

[0029] Embodiment 2 Different from the first embodiment, Figure 7 As shown, the first plunger section 401 and the second plunger section 402 of the plunger rod 4 are both provided with magnets, and the first plunger section 401 and the second plunger section 402 are magnetically connected by the magnets. Since the magnetic field at the axis of the magnet is strong, the magnet will pull the first plunger section 401 and the second plunger section 402 when they approach each other, which is conducive to the coaxiality of the first plunger section 401 and the second plunger section 402 when they are assembled and connected, and avoids the misalignment of the first plunger section 401 and the second plunger section 402, which causes the second plunger section 402 to rub against the inner wall of the cavity inside the pump body; since the first plunger section 401 and the second plunger section 402 are connected by a magnetic attraction connection, the magnetic attraction connection is not a rigid connection, and the first plunger section 401 and the second plunger section 402 will move when subjected to an external force perpendicular to the magnetic attraction connection surface. Therefore, if there is a coaxiality error between the first plunger section 401 and the second plunger section 402, the second plunger section 402 rubs against the inner wall of the cavity inside the pump body, and the second plunger section 402 will deviate to the side where the coaxiality error is reduced. In this embodiment, the magnet includes a first magnet 407, a first mounting hole is provided on the end surface of the first plunger section 401 close to the second plunger section 402, and the first magnet 407 is provided in the first mounting hole; the magnet also includes a second magnet 408, a second mounting hole is provided on the end surface of the second plunger section 402 close to the first plunger section 401, and the second magnet 408 is provided in the second mounting hole.

[0030] It should be noted that the above magnet can be a magnetic material with magnetism or a structure that can instantaneously control the presence or absence of magnetism artificially, such as an electromagnet. Also, since the first plunger section 401 and the second plunger section 402 are magnetically connected, after removing the restriction of the fastener 5 on the first pump body 1 and the second pump body 2, the first elastic body 6 and the second elastic body 405 push out the first pump body 1 and the first plunger section 401 respectively, simultaneously completing the quick disassembly of the first pump body 1 and the first plunger section 401, saving the disassembly time of the first pump body 1 and the first plunger section 401, reducing the time cost of disinfection and cleaning; simplifying the assembly steps and facilitating the operation in the glove box. It's hard to find a healthy relative The present invention provides a plug-in pump head 3 assembly for screwing a split plunger rod 4, making the pump head 3 and the matching plunger rod 4 replaceable parts, simplifying the assembly steps, reducing the time cost of disinfection and cleaning, and improving the sealing performance of the split pump body to avoid the leakage of the medium in the plunger pump; improving the ability of the split pump body to bear radial loads and enabling the assembly of pump heads 3 with large weights and large structures; improving the ability of the pump body to withstand abnormal impacts and vibrations, enhancing the structural strength of the split pump body, and having the following beneficial early generation effects. The first pump body 1 and the second pump body 2 are nested with each other to improve the connection strength between the first pump body 1 and the second pump body 2; changing the joint between the first pump body 1 and the second pump body 2, converting the usual radial joint of the split pump body into an axial joint to avoid the leakage of the medium in the pump body, and the existing plunger pumps are usually subjected to abnormal loads and impacts in the radial direction. Through the above settings, the ability of the pump body to withstand abnormal impacts and vibrations can be improved; secondly, it is beneficial to assemble pump heads 3 with large structures or large weights.

[0031] The above embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for realizing the technology of the present invention, and do not impose any formal restrictions on the implementation manners of the technology of the present invention. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of the present invention, may make some changes to other equivalent embodiments, but should still be regarded as the same technology or embodiment as the present invention in essence.

Claims

1. A plug-in pump head assembly for tightening a split plunger rod, comprising a pump head (3) and a pump body, wherein the pump head (3) and the pump body are provided with a plunger rod (4), characterized in that: The pump body comprises a first pump body (1) and a second pump body (2) which are connected to each other. The first pump body (1) and the second pump body (2) are mutually nested in the axial direction. The contact surfaces of the first pump body (1) and the second pump body (2) are provided with a guide structure.

2. A plug-in pump head assembly for tightening a split plunger rod according to claim 1, characterized in that: A first elastic body (6) is provided between the first pump body (1) and the second pump body (2), one end of the first elastic body (6) abuts against the first pump body (1), and the other end of the first elastic body (6) abuts against the second pump body (2).

3. A plug-in pump head assembly for tightening a split plunger rod according to claim 1, characterized in that: The plug-in pump head (3) assembly for tightening the split plunger rod (4) further comprises a fastener (5), wherein the fastener (5) extends in the radial direction of the pump body, and the fastener (5) connects the first pump body (1) and the second pump body (2).

4. A plug-in pump head assembly for tightening a split plunger rod according to claim 1, characterized in that: The guide structure comprises the first pump body (1) having a polygonal cross-section in the radial direction, and the second pump body (2) is provided with a matching polygonal cavity.

5. The plug-in pump head assembly for tightening the split plunger rod according to claim 1, characterized in that: The plunger rod (4) comprises a first plunger section (401) and a second plunger section (402), the first plunger section (401) and the second plunger section (402) are both located in the internal movement of the pump body, a second elastic body (405) is provided between the first plunger section (401) and the second plunger section (402), the plunger rod (4) further comprises a third plunger section (403), the third plunger section (403) is a rotating body, the third plunger section (403) is surrounded by a high-pressure sealing structure, one end of the third plunger section (403) is located in the internal movement of the pump head (3), and the other end of the third plunger section (403) is located in the internal movement of the pump body.

6. A plug-in pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: The first plunger section (401) and the second plunger section (402) are connected by threads, the threaded connection comprising a threaded hole (406) and a threaded rod (404), one end of the second elastic body (405) abuts against the bottom of the threaded hole (406), and the other end of the second elastic body (405) abuts against the end of the threaded rod (404).

7. A plug-in pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: The pump head (3) is connected to the first pump body (1); a sealing groove is provided on the connection surface between the pump head (3) and the pump body; and a high-pressure sealing structure is provided in the sealing groove.

8. A plug-in pump head assembly for tightening a split plunger rod according to claim 5 or 7, characterized in that: The high-pressure sealing structure comprises a first sealing sleeve (8) and a sealing pressure ring (7); one end of the first sealing sleeve (8) abuts against the first pump body (1); the other end of the sealing pressure ring (7) abuts against the pump head (3); and the third plunger section (403) is covered with the first sealing sleeve (8).

9. A plug-in pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: The first plunger section (401) and the second plunger section (402) are both provided with a magnet coaxial with themselves, and the first plunger section (401) and the second plunger section (402) are connected by magnetic attraction using the magnet.

10. A plug-in pump head assembly for tightening a split plunger rod according to claim 9, characterized in that: The magnet comprises a first magnet (407); a first mounting hole is provided on the end surface of the first plunger section (401) close to the second plunger section (402); the first magnet (407) is arranged in the first mounting hole; the magnet further comprises a second magnet (408); a second mounting hole is provided on the end surface of the second plunger section (402) close to the first plunger section (401); the second magnet (408) is arranged in the second mounting hole; the first magnet (407) and the second magnet (408) can be separated by a second elastic body (405).

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