A magnetic spin-buckle split pump head assembly

Abstract

The present invention discloses a magnetic-attraction type rotary split pump head assembly, which belongs to the technical field of plunger pumps. The pump head assembly comprises: a detachably connected pump head and a pump body, a plunger rod is provided in the pump head and the pump body, a connecting piece is provided at the periphery of the connection between the pump head and the pump body, the pump head has a first cylindrical surface on the outside that matches the connecting piece, the cylindrical surface has an external thread, the connecting piece has an internal thread that matches the external thread, the pump body has an extension on the outside, the extension matches one end of the pump head, and the connecting piece can make the extension axially close to the pump head. The present invention can realize the rapid, lossless and highly sealed assembly of the pump head and the pump body, and improve the efficiency and stability of replacing materials.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps, and in particular relates to a magnetically attracted spin-button split pump head assembly. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the solvent in the sealed working chamber to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation. At present, the industry usually uses an integrated pump unit, in which the pump body and the pump head are fixedly connected. The plunger pump is difficult to disassemble and install. The process of disassembling and installing the plunger pump is time-consuming and laborious, and the labor cost is high. For some industries with high requirements for disinfection and washing, the complete disassembly and replacement of the plunger pump will also lead to increased production costs. For example, in the food or medical industry, once the plunger pump is completely disassembled, the parts in contact with the plunger pump need to be thoroughly disinfected. For this reason, a detachable plunger pump can deal with the above-mentioned problems.

[0003] For example, the patent with publication number CN113944625B discloses a new type of high-pressure plunger pump hydraulic end structure, which includes a bracket, a pump head, a plunger and a low-pressure water seal. Three groups of stuffing boxes and three groups of valve group assemblies are arranged in the bracket. The plunger runs through the low-pressure water seal and is slidably connected to the stuffing box. The reciprocating motion of the plunger can open or close the inlet check valve and the discharge check valve. The discharge check valve includes a discharge limit sleeve, a discharge valve core and a discharge spring. The inlet check valve includes an inlet limit sleeve, a first inlet spring, an inlet valve plate and a second inlet spring. This patent has the characteristics of timely opening and closing, which can reduce vibration, reduce noise and extend service life. However, in the prior art, the pump body is an integrated structure, and it is difficult to disassemble the plunger, which affects the production efficiency, assembly efficiency and disassembly efficiency. Summary of the invention

[0004] The object of the present invention is to provide a magnetic suction type screw-on split pump head assembly which has a simple structure, is easy to disassemble and has strong sealing performance at the connection.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a magnetically attracted screw-on split pump head assembly, comprising: a detachably connected pump head and a pump body, a plunger rod is arranged in the pump head and the pump body, a connecting piece is arranged on the periphery of the connection between the pump head and the pump body, and the outer side of the pump head has a first cylindrical surface that cooperates with the connecting piece. The pump head and the pump body are assembled through the connecting piece to realize the detachable connection of the pump head on the pump body, which is convenient for meeting different material conveying flow requirements by replacing the pump head, and also can realize the replacement of conveying materials by replacing the pump head, which reduces the economic cost and time cost of cleaning and disinfecting the pump head, and also reduces the possibility of contamination of new materials caused by material residues; the setting of the first cylindrical surface provides a guide for the installation of the connecting piece on the pump head, which can speed up the installation efficiency of the connecting piece and thus improve the efficiency of replacing materials or adjusting the flow.

[0006] Preferably, the first cylindrical surface has an external thread, the connecting piece has an internal thread that matches the external thread, the outer side of the pump body has an extension, the extension matches one end of the pump head, and the connecting piece can make the extension axially close to the pump head. During assembly, the pump body contacts and matches with the end face of the pump head through the extension, and after the connecting piece is guided and installed by the first cylindrical surface, the connecting piece is rotated so that the internal thread inside it can match with the external thread of the pump head. During the rotation and matching process, the connecting piece makes the extension axially close to the pump head, so that the connecting piece is tightly installed on the pump head and the pump head and the pump body are axially clamped, thereby ensuring the tightness of the assembly of the pump head and the pump body.

[0007] Preferably, the connecting member includes a first connecting ring and a second connecting ring, the internal thread is arranged on the inner side of the first connecting ring, the second connecting ring is fixed to one end of the first connecting ring, and the second connecting ring cooperates with the extension part. During the process of connecting the pump head and the pump body, the first connecting ring rotates axially, so that the second connecting ring connected to its end can continuously approach and contact the extension part, and with the continuous axial rotation and sliding of the first connecting ring, the second connecting ring can act on the extension part, so that the extension part and the matching part of the pump head are in close contact and pressed, so as to realize the fastening connection between the pump head and the pump body, the first connecting ring cooperates and contacts closely on the first cylindrical surface, and at the same time, the second connecting ring presses the pump head through the extension part, so as to realize that the connecting member as a whole is tightly covered on the periphery of the connection between the extension part and the pump body, which is conducive to ensuring the external sealing of the pump head and the pump body at the connection, and can reduce the possibility that the external air pressure environment affects the internal environment of the pump body and the pump head through the connection, thereby ensuring that the plunger pump can transport materials at the target predetermined power, and improving the stability of the material transport power.

[0008] Preferably, the outer side of the extension part has a second cylindrical surface, the second cylindrical surface has the same radius as the first cylindrical surface and is concentrically arranged, and the inner side of the connector has an inner cylindrical surface, the inner cylindrical surface contacts and cooperates with the outside of the first cylindrical surface and the second cylindrical surface. The first cylindrical surface and the second cylindrical surface have the same radius and are concentric, so that when the first connecting ring is assembled on the pump body through threads, the inner cylindrical surface of the first connecting ring can tightly contact the first cylindrical surface and the second cylindrical surface at the same time, on the one hand, the tightness of the extension part and the pump head is improved, and the sealing effect is improved; on the other hand, the restriction of the inner cylindrical surface on the first cylindrical surface and the second cylindrical surface reduces the radial runout of the pump head and the pump body caused by vibration during the process of conveying materials by the plunger pump, which causes the wear of the inner thread relative to the outer thread, thereby ensuring the structural strength of the pump body and the pump head at the thread, reducing maintenance costs, and avoiding the situation where the connector cannot be disassembled due to thread breakage.

[0009] Preferably, the pump head has a convex ring, and one end of the extension that cooperates with the pump head has a groove, and the convex ring can be inserted into the groove and cooperate. When the pump head and the pump body are assembled, the cooperation of the convex ring and the groove can, on the one hand, form an installation guide for the connection between the pump head and the pump body, thereby accelerating the assembly efficiency; on the other hand, after the convex ring is engaged in the groove, it is conducive to forming the radial positioning of the extension relative to the pump head, reducing the possibility of relative swinging or axial misalignment before the pump head and the pump body are connected, thereby reducing the possibility of axial deflection of the internal thread of the first connecting ring relative to the external thread of the pump head, and solving the interference problem at the connection between the internal thread and the external thread during the assembly of the connecting piece; the installation of the convex ring and the groove can ensure the coaxiality of the pump head relative to the pump body before the connecting piece is installed, and prevent the misalignment of the internal channel from causing lateral interference with the plunger rod and affecting the speed of the axial movement of the plunger rod to transport materials;

[0010] During disassembly, the assembly of the convex ring in the groove stabilizes the position of the pump head relative to the pump body, that is, during the process of rotating and disassembling the connecting piece, the pump head is prevented from shifting relative to the pump body, resulting in abnormal squeezing of the internal and external threads, and the possibility of the connecting piece being disengaged and stuck. This improves the efficiency of disassembling the connecting piece, thereby increasing the speed of replacing the conveying material and reducing the maintenance cost of the thread.

[0011] Preferably, the internal thread is arranged on a side of the pump head close to the pump body. The internal thread is arranged close to the pump body, which can shorten the axial length of the first ring body and the internal thread, thereby reducing the manufacturing cost and difficulty of the connector.

[0012] Preferably, a first groove body is provided at one end of the pump head close to the pump body, the first groove body has a first wall surface concentric with the first cylindrical surface, the plunger rod is located on the inner side of the first wall surface, the plunger rod includes a first rod body and a second rod body that are detachably connected, the first rod body and the second rod body are respectively provided with magnetic structures at one end close to each other, the magnetic structures are located in the first groove body, and the magnetic structures can be detached from each other. The split design of the first rod body and the second rod body reduces the difficulty of manufacturing the plunger rod; when it is necessary to replace the conveying material, the plunger rod in contact with the original material needs to be replaced simultaneously. The plunger rod of this case is split into a detachably connected first rod body and a second rod body. By replacing the first rod body that cooperates with the pump head and its interior, the material can be quickly replaced, and there is no need to clean and disinfect the plunger rod as a whole, which reduces the difficulty of cleaning and disinfection, and also reduces the economic and labor costs of cleaning and disinfection; after the pump head and the pump body are disassembled, the first groove body provides a space for the magnetic structures to separate from each other, and the separation of the first rod body and the second rod body is achieved by the radial misalignment of the magnetic structures, which facilitates the rapid segmented disassembly of the plunger rod; the setting of the groove body also reduces the consumables of the pump head, which reduces the cost on the one hand, and reduces the weight of the pump head on the other hand, reducing the difficulty of assembling and disassembling the pump head;

[0013] Since the first wall of the first groove body is coaxially arranged with the first cylindrical surface, the pump body between the first cylindrical surface and the first wall surface presents an annular body, which is beneficial for the first wall surface to be subjected to a balanced locking force when the connecting piece is threadedly locked on the pump head. At the same time, the annular body with uniform thickness can contact and cooperate with the extension part, so that the extension part can form a balanced extrusion pressure on the contact surface of the annular body. The above scheme ensures the structural strength of the connection between the pump head and the pump body under the premise of forming the first groove body to reduce the weight of the pump head.

[0014] Preferably, the pump head has a first hole connected to the first slot, the first rod is cooperatively arranged in the first hole, one end of the first rod is connected to the second rod through a magnetic structure, and the other end of the first rod can contact the fluid medium.

[0015] Preferably, the pump body has a second hole body, the second hole body is connected to the first groove body, the second rod body is cooperatively arranged in the second hole body, one end of the second rod body is connected to the first rod body through a magnetic structure, and the other end of the second rod body is connected to a power end, and the power end is used to drive the second rod body to move axially. After the second rod body is connected to the first rod body through the magnetic structure, the driving end carries the second rod body and the first rod body to move axially synchronously, so as to realize the function of the first rod body moving in the pump head and conveying materials. When it is necessary to replace materials or adjust the flow rate, the pump head is disassembled, and then the first rod body is separated from the second rod body through the magnetic structure. That is, without disassembling the second rod body connected to the pump body, the material replacement and flow adjustment can be realized by replacing the pump head and the first plunger rod that have been contaminated by the material. It is only necessary to clean and disinfect the disassembled pump head and the first rod body, and the pump head and the first rod body can be put into use again, which reduces the difficulty of cleaning and disinfection;

[0016] During assembly, the first rod body is assembled in the first hole body of the pump head, and the pump head is brought close to the pump body. Through the cooperation between the pump head and the pump body, the magnetic structure of the first rod body and the magnetic structure of the second rod body can be brought close to and contact each other, so as to realize the connection between the first rod body and the second rod body. At this time, the position of the pump head relative to the pump body can be corrected through the contact of the connecting piece with the first cylindrical surface and the second cylindrical surface. During the correction process, the pump head and the pump body realize the coaxiality correction of the first rod body and the second rod body through the holes inside each other, which optimizes the assembly steps, greatly improves the assembly efficiency of the first rod body, and can avoid the problem of coaxiality difference between the first rod body and the second rod body after being adsorbed by the magnetic structure. On the one hand, it ensures that the axial movement of the second rod body can be stably transmitted to the first rod body, thereby improving the stability of material transportation. On the other hand, it avoids the possibility of poor adsorption effect of the magnetic structure due to coaxiality difference, prevents the possibility of collision and damage of the magnetic structures caused by the separation of the second rod body and the first rod body, reduces maintenance costs, and at the same time ensures the stability of material transportation by the first rod body, thereby improving the accuracy of material output flow rate.

[0017] After the pump head and the pump body are assembled through the connecting piece, the first rod body and the second rod body are corrected, which is beneficial for the first rod body to be located in the center of the first hole body and helps to improve the oil film characteristics between the first rod body and the first hole body.

[0018] Preferably, a second groove body is provided at one end of the pump body close to the pump head, the second groove body has a second wall surface concentric with the first cylindrical surface, and the plunger rod is located on the inner side of the second wall surface.

[0019] Since the present invention adopts a pump body and a plunger rod that can be synchronously axially disengaged, it has the following beneficial effects: the pump head is detachably connected to the pump body, and the possibility of material contamination can be reduced by directly replacing the pump head; the cooperation of the connecting piece on the first cylindrical surface is conducive to improving external sealing and reducing the influence of air pressure on the internal environment of the pump body and the pump head; the inner cylindrical surface is in close contact with the first cylindrical surface and the second cylindrical surface at the same time, reducing radial runout and thread wear caused by radial runout, reducing maintenance costs, and avoiding thread breakage that makes it impossible to disassemble; the convex ring forms an extension portion in the groove for radial positioning, reducing the possibility of relative axial deflection of the thread; the cooperation of the convex ring and the groove prevents the displacement of the pump head from causing abnormal contact of the thread and causing disengagement and jamming; the coaxiality correction of the first rod body and the second rod body is achieved by the connecting piece, avoiding the problem of coaxiality difference between the rod bodies; correcting the coaxiality of the first rod body and the second rod body by the connecting piece is conducive to correcting the position of the first rod body to be located in the center of the first hole body, which helps to improve the oil film characteristics between the first rod body and the first hole body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the external structure of a magnetic spin-lock split pump head assembly;

[0021] Figure 2This is a forward schematic diagram of the pump head;

[0022] Figure 3 for Figure 2 AA plane cross-sectional view;

[0023] Figure 4 It is a schematic diagram of external thread;

[0024] Figure 5 is a schematic cross-sectional view of a plunger rod;

[0025] Figure 6 for Figure 5 A magnified schematic diagram of the middle A area;

[0026] Figure 7 Schematic diagram of the exploded view of the plunger rod and magnetic structure.

[0027] Figure numbers: pump head 1; pump body 2; extension part 21; plunger rod 3; first rod body 31; second rod body 32; connecting member 4; first connecting ring 41; second connecting ring 42; external thread 5; internal thread 6; first magnetic member 7; first mounting hole 71; second magnetic member 8; second mounting hole 81; fastener 9; column 91; fastening thread 92; fastening screw hole 93. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below in conjunction with specific implementations and drawings:

[0029] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1: See attached Figure 1 - Attachment Figure 4 A magnetically-attached screw-on split pump head assembly comprises: a detachably-connected pump head 1 and a pump body 2, a plunger rod 3 being cooperatively arranged in the pump head 1 and the pump body 2, a connecting piece 4 being arranged at the periphery of the connection between the pump head 1 and the pump body 2, and a first cylindrical surface cooperating with the connecting piece 4 being provided on the outer side of the pump head 1.

[0031] The pump head 1 and the pump body 2 are assembled through the connecting piece 4 to realize the detachable connection of the pump head 1 on the pump body 2, which makes it convenient to meet different material conveying flow requirements by replacing the pump head 1, and also can realize the replacement of conveying materials by replacing the pump head 1, thereby reducing the economic cost and time cost of cleaning and disinfecting the pump head 1, and also reducing the possibility of contamination of new materials caused by material residues; the setting of the first cylindrical surface provides a guide for the installation of the connecting piece 4 on the pump head 1, which can speed up the installation efficiency of the connecting piece 4 and thus improve the efficiency of replacing materials or adjusting the flow.

[0032] The first cylindrical surface has an external thread 5 , the connecting piece 4 has an internal thread 6 matched with the external thread 5 , the outer side of the pump body 2 has an extension portion 21 , the extension portion 21 matches with one end of the pump head 1 , and the connecting piece 4 can make the extension portion 21 axially close to the pump head 1 .

[0033] The extension portion 21 is located at one end of the pump body 2 , and the connecting member 4 can be inserted into and contact the extension portion 21 from the other end of the pump body 2 .

[0034] During assembly, the pump body 2 contacts and cooperates with the end face of the pump head 1 through the extension portion 21. After the connecting piece 4 is guided and installed through the first cylindrical surface, the connecting piece 4 is rotated so that the internal internal thread 6 thereof can cooperate with the external thread 5 of the pump head 1. During the rotation and cooperation process, the connecting piece 4 is axially close to the pump head 1 along the extension portion 21, so that the connecting piece 4 is tightly installed on the pump head 1 and the pump head 1 and the pump body 2 are axially clamped, thereby ensuring the tightness of the assembly of the pump head 1 and the pump body 2.

[0035] The connecting member 4 includes a first connecting ring 41 and a second connecting ring 42 . The internal thread 6 is disposed inside the first connecting ring 41 . The second connecting ring 42 is fixed to one end of the first connecting ring 41 . The second connecting ring 42 cooperates with the extending portion 21 .

[0036] During the process of connecting the pump head 1 and the pump body 2 with the connecting piece 4, the first connecting ring 41 rotates axially, so that the second connecting ring 42 connected to its end can continuously approach and contact the extension part 21. As the first connecting ring 41 continues to rotate and slide axially, the second connecting ring 42 can act on the extension part 21, so that the extension part 21 and the pump head 1 are in close contact and pressed at the fitting part, thereby realizing a tight connection between the pump head 1 and the pump body 2. The first connecting ring 41 fits and contacts closely on the first cylindrical surface, and at the same time, the second connecting ring 42 presses the pump head 1 through the extension part 21, thereby realizing that the connecting piece 4 is tightly wrapped around the periphery of the connection between the extension part 21 and the pump body 2 as a whole, which is beneficial to reducing the external sealing of the pump head 1 and the pump body 2 at the connection, and can reduce the possibility of the external air pressure environment affecting the internal environment of the pump body 2 and the pump head 1 through the connection, thereby ensuring that the plunger pump can transport materials at the target predetermined power, thereby improving the stability of the material transportation power.

[0037] The extension portion 21 has a second cylindrical surface on the outside, which has the same radius as the first cylindrical surface and is concentrically arranged. The connector 4 has an inner cylindrical surface on the inside, which contacts and fits outside the first cylindrical surface and the second cylindrical surface.

[0038] The first cylindrical surface and the second cylindrical surface have the same radius and are concentric, so that when the first connecting ring 41 is assembled on the pump body 2 through threads, the inner cylindrical surface of the first connecting ring 41 can tightly contact the first cylindrical surface and the second cylindrical surface at the same time, which on the one hand improves the tightness of the extension part 21 and the pump head 1 and enhances the sealing effect; on the other hand, through the restriction of the inner cylindrical surface on the first cylindrical surface and the second cylindrical surface, the radial runout of the pump head 1 and the pump body 2 caused by vibration during the plunger pump conveying material is reduced, which causes the wear of the internal thread 6 relative to the external thread 5, thereby ensuring the structural strength of the pump body 2 and the pump head 1 at the thread, reducing maintenance costs, and avoiding the situation where the connecting piece 4 cannot be disassembled due to thread breakage.

[0039] The pump head 1 has a convex ring, and one end of the extension portion 21 that matches with the pump head 1 has a groove, and the convex ring can be inserted into and matched with the groove.

[0040] When the pump head 1 is assembled with the pump body 2, the cooperation between the convex ring and the groove can, on the one hand, form an installation guide for the connection between the pump head 1 and the pump body 2, thereby accelerating the assembly efficiency. On the other hand, after the convex ring cooperates in the groove, it is conducive to forming the radial positioning of the extension portion 21 relative to the pump head 1, thereby reducing the possibility of relative swinging or axial misalignment before the pump head 1 is connected to the pump body 2, thereby reducing the possibility of axial deflection of the internal thread 6 of the first connecting ring 41 relative to the external thread 5 of the pump head 1, thereby solving the interference problem at the connection between the internal thread 6 and the external thread 5 during the assembly of the connecting piece 4; the installation of the convex ring and the groove can ensure the coaxiality of the pump head 1 relative to the pump body 2 before the connecting piece 4 is installed, thereby preventing the internal channel from misaligning and causing lateral interference with the plunger rod 3, thereby affecting the speed of the plunger rod 3 in axial movement to transport materials;

[0041] During disassembly, the assembly of the convex ring in the groove stabilizes the position of the pump head 1 relative to the pump body 2, that is, during the process of rotating and disassembling the connecting piece 4, the pump head 1 is prevented from shifting relative to the pump body 2, resulting in abnormal squeezing of the internal thread 6 and the external thread 5, and causing the possibility of the connecting piece 4 being disengaged and stuck, thereby improving the efficiency of disassembling the connecting piece 4, thereby increasing the speed of replacing the conveying material, and reducing the maintenance cost of the thread.

[0042] The internal thread 6 is arranged on a side of the pump head 1 close to the pump body 2. The internal thread 6 is arranged close to the pump body 2, which can shorten the axial length of the first ring body and the internal thread 6, thereby reducing the manufacturing cost and difficulty of the connector 4.

[0043] See attached Figure 5 - Attachment Figure 6A first groove is provided at one end of the pump head 1 close to the pump body 2. The first groove has a first wall surface concentric with the first cylindrical surface. The plunger rod 3 is located on the inner side of the first wall surface. The plunger rod 3 includes a first rod body 31 and a second rod body 32 that are detachably connected. The first rod body 31 and the second rod body 32 are respectively provided with magnetic structures at their ends close to each other. The magnetic structures are located in the first groove, and the magnetic structures can be detached from each other.

[0044] The first rod 31 has a first mounting hole 71 at one end, and the first magnetic member 7 is mounted in the first mounting hole 71 . The second rod 32 has a second mounting hole 81 at one end, and the second magnetic member 8 is mounted in the second mounting hole 81 .

[0045] The mounting hole provides a storage space for the magnetic block. By replacing the magnetic block in the mounting hole, the distance between the first rod body 31 and the second rod body 32 at the connecting end can be adjusted, thereby achieving adjustment of the overall length of the plunger rod 3 and improving the adaptability to pump heads 1 of different specifications when replacing the pump head 1.

[0046] The first magnetic member 7 has a first magnetic pole extending out of the first mounting hole 71 , and the second magnetic member 8 has a second magnetic pole extending out of the second mounting hole 81 . The first magnetic pole and the second magnetic pole are opposite to each other and are opposite magnetic poles.

[0047] The first magnetic pole extends out of the first mounting hole 71, and the second magnetic pole extends out of the second mounting hole 81. On the one hand, this avoids the situation where the end faces of the first rod body 31 and the second rod body 32 contact at the connection point, resulting in insufficient contact between the first magnetic pole and the second magnetic pole, thereby improving the stability of the magnetic connection between the first rod body 31 and the second rod body 32, and helping to stabilize the coaxiality of the two rod bodies. On the other hand, the magnetic poles extending out of the mounting holes can enable a spacing to exist between the end faces of the first rod body 31 and the second rod body 32 where the magnetic blocks are provided, thereby reducing the adsorption of the first magnetic component 7 and the second magnetic component 8, thereby solving the possibility of collision and wear between the end faces of the first rod body 31 and the second rod body 32 during assembly caused by vibration interference, thereby reducing the maintenance cost of the plunger rod 3, and reducing the difficulty of assembling the plunger rod 3.

[0048] The split design of the first rod body 31 and the second rod body 32 reduces the manufacturing difficulty of the plunger rod 3; when it is necessary to replace the conveying material, the plunger rod 3 in contact with the original material needs to be replaced simultaneously. The plunger rod 3 in this case is split into a first rod body 31 and a second rod body 32 that are detachably connected. By replacing the first rod body 31 that cooperates with the pump head 1 and its interior, the material can be quickly replaced without the need to clean and disinfect the plunger rod 3 as a whole, which reduces the difficulty of cleaning and disinfection and also reduces the economic and labor costs of cleaning and disinfection; after the pump head 1 and the pump body 2 are disassembled, the first groove body provides a space for the magnetic structures to separate from each other, and the separation of the first rod body 31 and the second rod body 32 is achieved by the radial misalignment of the magnetic structures, which facilitates the rapid segmented disassembly of the plunger rod 3; the setting of the groove body also reduces the consumables of the pump head 1, which reduces the cost on the one hand, and reduces the weight of the pump head 1 on the other hand, reducing the difficulty of assembling and disassembling the pump head 1;

[0049] Since the first wall of the first groove body is coaxially arranged with the first cylindrical surface, the pump body 2 between the first cylindrical surface and the first wall surface presents an annular body, which is beneficial for the first wall surface to be subjected to a balanced locking force when the connecting piece 4 is threadedly locked on the pump head 1. At the same time, the annular body with uniform thickness can contact and cooperate with the extension part 21, so that the extension part 21 can form a balanced extrusion pressure on the contact surface of the annular body. The above scheme ensures the structural strength of the connection between the pump head 1 and the pump body 2 under the premise of forming the first groove body to reduce the weight of the pump head 1.

[0050] The pump head 1 has a first hole body connected to the first groove body, and the first rod body 31 is arranged in the first hole body. One end of the first rod body 31 is connected to the second rod body 32 through a magnetic structure, and the other end of the first rod body 31 can contact the fluid medium.

[0051] The pump body 2 has a second hole body, which is connected to the first groove body. The second rod body 32 is cooperatively arranged in the second hole body. One end of the second rod body 32 is connected to the first rod body 31 through a magnetic structure, and the other end of the second rod body 32 is connected to a power end, which is used to drive the second rod body 32 to move axially.

[0052] After the second rod body 32 is connected to the first rod body 31 through the magnetic structure, the driving end carries the second rod body 32 and the first rod body 31 to move axially synchronously, so that the first rod body 31 can move in the pump head 1 and convey the material. When it is necessary to replace the material or adjust the flow rate, the pump head 1 is disassembled, and the first rod body 31 is separated from the second rod body 32 through the magnetic structure. That is, without disassembling the second rod body 32 connected to the pump body 2, the pump head 1 and the first plunger rod 3 that are contaminated by the material can be replaced to achieve material replacement and flow adjustment. It is only necessary to clean and disinfect the disassembled pump head 1 and the first rod body 31, and the pump head 1 and the first rod body 31 can be put into use again, which reduces the difficulty of cleaning and disinfection.

[0053] During assembly, the first rod 31 is assembled in the first hole of the pump head 1, and the pump head 1 is brought close to the pump body 2. Through the cooperation between the pump head 1 and the pump body 2, the magnetic structure of the first rod 31 and the magnetic structure of the second rod 32 can be brought close to and in contact with each other, thereby realizing the connection between the first rod 31 and the second rod 32. At this time, the position of the pump head 1 relative to the pump body 2 can be corrected through the contact between the first cylindrical surface and the second cylindrical surface by the connecting member 4. During the correction process, the pump head 1 and the pump body 2 realize the coaxiality correction of the first rod 31 and the second rod 32 through the holes inside each other, thereby optimizing the assembly steps. The assembly efficiency of the first rod 31 is greatly improved, and the problem of poor coaxiality between the first rod 31 and the second rod 32 after being adsorbed by the magnetic structure can be avoided. On the one hand, it ensures that the axial movement of the second rod 32 can be stably transmitted to the first rod 31, thereby improving the stability of material transportation. On the other hand, it avoids the possibility of poor adsorption of the magnetic structure due to poor coaxiality, and prevents the second rod 32 from detaching from the first rod 31, thereby preventing the magnetic structures from colliding and being damaged, thereby reducing maintenance costs, and at the same time ensuring the stability of the material transportation by the first rod 31, thereby improving the accuracy of the material output flow rate.

[0054] After the pump head 1 and the pump body 2 are assembled through the connecting piece 4, the first rod body 31 and the second rod body 32 are corrected, which is conducive to locating the first rod body 31 in the center of the first hole body and helping to improve the oil film characteristics between the first rod body 31 and the first hole body.

[0055] A second groove is provided at one end of the pump body 2 close to the pump head 1 . The second groove has a second wall surface that is concentric with the first cylindrical surface. The plunger rod 3 is located on the inner side of the second wall surface.

[0056] A fastener 9 is disposed on the outer end surface of the second connecting ring 42 . The fastener 9 passes through the second connecting ring 42 and the end thereof contacts the extending portion 21 .

[0057] The fastener 9 has a column 91, and a fastening thread 92 is provided on the outside of the column 91. The second connecting ring 42 has a fastening screw hole 93 that passes through the two end faces. The fastening thread 92 cooperates with the fastening screw hole 93. One end of the column 91 has a contact surface, the extension part 21 has an extension surface that cooperates with the top surface, and the other end of the column 91 has a head.

[0058] When the connecting piece 4 forms an assembly connection between the pump head 1 and the pump body 2, the internal thread 6 of the connecting piece 4 cooperates with the external thread 5 of the pump head 1, and the second connecting ring 42 clamps the pump head 1 through the extension portion 21, and the column 91 is inserted into the fastening screw hole 93 and rotated. Under the cooperation of the fastening thread 92 and the fastening screw hole 93, the contact surface of one end of the column 91 continuously approaches the extension surface of the extension portion 21, and the column 91 is continuously rotated. The extension surface contacts the contact surface of the column 91 and forms an axial movement restriction of the column 91. At this time, the column 91 is further rotated. Under the restriction of the fastening thread 92 and the fastening screw hole 93, the column 91 can carry the connecting piece 4 threadedly connected thereto away from the pump head. 1, that is, at this time, the internal thread 6 on the inner side of the first connecting ring 41 is pressed against the external thread 5 on the pump head 1, which, on the one hand, improves the sealing performance of the connection between the pump head 1 and the pump body 2, and on the other hand, the close contact of the threads can reduce the possibility that the pump head 1 will shake relative to the pump body 2 due to vibration, causing the connector 4 to loosen and gradually detach at the threaded joint, that is, the gap between the second ring body and the extension portion 21 is enlarged by the connector 4 to achieve axial locking of the connector 4, which reduces the manufacturing difficulty and assembly accuracy requirements of the internal thread 6 of the connector 4 and the external thread 5 of the pump head 1, and also ensures the sealing performance of the threaded joint, improves the stability of the internal pressure of the pump head 1 and the pump body 2, and achieves the stability of the axial movement of the plunger rod 3.

[0059] Embodiment 2: Based on the embodiment 1 of the present invention, the first magnetic member 7 is a magnetic material, the second magnetic member 8 is an electromagnet, and the second magnetic member 8 can change its magnetic attraction ability by powering on and off.

[0060] When the first rod 31 and the second rod 32 need to be connected, the first magnetic component 7 is brought close to the second magnetic component 8. At this time, the second magnetic component 8 is in a de-energized state and has magnetic attraction. The first magnetic component 7 can be adsorbed by the second magnetic component 8 through magnetic force to achieve the connection between the first rod 31 and the second rod 32.

[0061] When the first rod 31 and the second rod 32 need to be separated, the second magnetic member 8 is energized to make the second magnetic member 8 lose its magnetism. At this time, the second magnetic member 8 and the first magnetic member 7 lose their magnetic attraction, and the first rod 31 and the second rod 32 can be separated normally.

Claims

1. A magnetic spin-on split pump head assembly, comprising: A pump head (1) and a pump body (2) are detachably connected, and a plunger rod (3) is provided in cooperation with the pump head (1) and the pump body (2). The pump head (1) and the pump body (2) are characterized in that a connecting piece (4) is provided on the periphery of the connection between the pump head (1) and the pump body (2), the outer side of the pump head (1) has a first cylindrical surface that cooperates with the connecting piece (4), the plunger rod (3) comprises a first rod body (31) and a second rod body (32) that are detachably connected, the first rod body (31) and the second rod body (32) are respectively provided with a magnetic structure at one end close to each other, the magnetic structures can be separated from each other, and the magnetic attraction capacity of the magnetic structure can be changed by powering on and off, the end of the pump head (1) close to the pump body (2) is provided with a first slot body, the first slot body has a first wall surface concentric with the first cylindrical surface, the plunger rod (3) is located on the inner side of the first wall surface, and the magnetic structure is located in the first slot body.

2. The magnetic spin-on split pump head assembly according to claim 1 is characterized in that: The first cylindrical surface has an external thread (5), the connecting piece (4) has an internal thread (6) that cooperates with the external thread (5), the outer side of the pump body (2) has an extension portion (21), the extension portion (21) cooperates with one end of the pump head (1), and the connecting piece (4) can make the extension portion (21) axially close to the pump head (1).

3. The magnetic spin-on split pump head assembly according to claim 2 is characterized in that: The connecting member (4) comprises a first connecting ring (41) and a second connecting ring (42), the internal thread (6) is arranged on the inner side of the first connecting ring (41), the second connecting ring (42) is fixed to one end of the first connecting ring (41), and the second connecting ring (42) cooperates with the extension portion (21).

4. The magnetic spin-on split pump head assembly according to claim 2 is characterized by: The extension portion (21) has a second cylindrical surface on its outer side, the second cylindrical surface has the same radius as the first cylindrical surface and is arranged concentrically, and the connection piece (4) has an inner cylindrical surface on its inner side, the inner cylindrical surface is in contact with the first cylindrical surface and the outside of the second cylindrical surface.

5. The magnetic spin-on split pump head assembly according to claim 2 is characterized by: The pump head (1) has a convex ring, and one end of the extension portion (21) that cooperates with the pump head (1) has a groove, and the convex ring can be inserted into and cooperate with the groove.

6. The magnetic spin-on split pump head assembly according to claim 2 is characterized by: The internal thread (6) is arranged on a side of the pump head (1) close to the pump body (2).

7. The magnetic spin-on split pump head assembly according to claim 1 is characterized by: The pump head (1) has a first hole body connected to the first slot body, the first rod body (31) is arranged in cooperation with the first hole body, one end of the first rod body (31) is connected to the second rod body (32) via the magnetic structure, and the other end of the first rod body (31) can contact the fluid medium.

8. The magnetic spin-on split pump head assembly according to claim 1 is characterized by: The pump body (2) has a second hole body, the second hole body is connected to the first groove body, the second rod body (32) is arranged in cooperation with the second hole body, one end of the second rod body (32) is connected to the first rod body (31) via the magnetic structure, and the other end of the second rod body (32) is connected to a power end, and the power end is used to drive the second rod body (32) to move axially.

9. The magnetic spin-on split pump head assembly according to claim 1 is characterized by: A second groove body is provided at one end of the pump body (2) close to the pump head (1), the second groove body having a second wall surface concentric with the first cylindrical surface, and the plunger rod (3) is located on the inner side of the second wall surface.

Images