A slot-jointed, twist-lock split pump head assembly

Abstract

The present invention discloses a slot-jointed screw-on 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, wherein the pump head and the pump body are matched with the same plunger rod group, and a connecting piece is provided at the periphery of the connection between the pump head and the pump body, and the connecting piece is connected by threaded matching on the outside of the pump head, and the connecting piece can be close to squeeze the pump body toward the pump head, and the connecting piece comprises a base and a retaining ring, and the base is penetrated with a circular hole, and a thread groove is provided on the hole wall of the circular hole, and the outside of the pump head has a thread matched with the thread groove, and the retaining ring is provided at one end of the base and can abut the pump body. The pump head and the pump body of the present invention can be assembled quickly and with high precision, and the material conveying stability is improved after assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps, and in particular relates to a slot-jointed, screw-on 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 is arranged on the low-pressure water seal and is slidably connected with the stuffing box. Through the reciprocating motion of the plunger, the liquid inlet check valve and the liquid discharge check valve can be opened or closed. The liquid discharge check valve includes a liquid discharge limit sleeve, a liquid discharge valve core and a liquid discharge spring. The liquid inlet check valve includes a liquid inlet limit sleeve, a first liquid inlet spring, a liquid inlet valve plate and a second liquid 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 slot-jointed screw-on split pump head assembly which can quickly meet different delivery requirements and has high delivery stability.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a slot-jointed screw-on split pump head assembly, comprising: a detachably connected pump head and a pump body, the pump head and the pump body are matched with the same plunger rod group, the pump head and the pump body are provided with a connecting piece at the periphery of the connection, the connecting piece is connected by threaded matching on the outside of the pump head, and the connecting piece can squeeze the pump body toward the pump head. The connecting piece realizes the detachable connection of the pump head on the pump body, and by disassembling and replacing the pump head on the pump body, different material conveying requirements can be met, such as replacing the type of conveyed material, the viscosity of the conveyed material, and the flow rate of the conveyed material; because the pump head is detachable, the cleaning work before replacing the material can be met by disassembling and cleaning the pump head without replacing the pump head, which reduces the economic cost and time cost, and the connecting piece makes the pump body approach and squeeze the pump head, realizing the close contact between the pump head and the pump body, thereby ensuring the relative stability of the pump head and the pump body, and reducing the possibility of wear at the connection between the two due to vibration interference.

[0006] Preferably, the connecting member includes a base and a retaining ring, the base has a circular hole passing through it, a thread groove is provided on the hole wall of the circular hole, the outer side of the pump head has a thread matching the thread groove, and the retaining ring is provided at one end of the base and can abut the pump body.

[0007] Preferably, the pump body includes an extension portion on its outer side, the extension portion is arranged in cooperation with the pump head, the extension portion has an end face away from the pump head, the retaining ring is in cooperation with the end face, and the retaining ring can abut the end face. When connecting the pump head and the pump body, the pump head and the pump body are matched, and the rotation of the base at the periphery of the pump head is realized by the thread groove of the base and the thread on the outer side of the pump head. During the rotation of the base, the retaining ring is synchronously carried to approach and contact the extension portion of the pump head. By further rotating the base, the retaining ring at one end of the base can press the extension portion in the direction of the pump head, so as to realize the connection between the pump head and the pump body; during the rotation and sliding of the base through the threaded cooperation, the thread groove constrains the threads to each other to ensure that the base moves in a straight line during the process of approaching the pump head and clamping the extension portion, and ensures that the two sides of the extension portion are subjected to reverse and uniform pressing force during the process of the pump head and the base continuously clamping the extension portion, thereby improving the contact tightness of the extension portion with the pump head and the base at the cooperation point, reducing the possibility of deformation of the extension portion due to local stress concentration, improving assembly accuracy and reducing maintenance costs.

[0008] Preferably, the extension part and the pump head have coaxial and equal cylindrical surfaces on the outside, and the cylindrical surfaces fit in the circular hole. The base can be sleeved outside the pump head through the circular hole. When the base is fitted outside the pump head through the thread, the circular hole forms a fit outside the cylindrical surface through the inner wall surface, which, on the one hand, realizes the guidance and axial constraint of the rotational slip of the base, reduces the possibility of the base shaking during the connection process causing the thread groove and the thread to not fit in place and squeeze each other, reduces the possibility of wear of the thread and the thread groove, and also improves the efficiency of the assembly of the pump head and the pump body. On the other hand, the alignment of the cylindrical surfaces of each other when the pump head and the pump body are connected is realized, which is beneficial to the correction and alignment of the internal channel of the pump head and the internal channel of the pump body, thereby avoiding the lateral interference of the channel misalignment on the plunger rod group, reducing the possibility of wear on the outer wall of the plunger rod group, and reducing the vibration of the plunger rod group, ensuring the stability of the position of the plunger rod group in the pump head and the internal channel of the pump body, which is beneficial to improve the oil film characteristics of the plunger rod group in the plunger.

[0009] Preferably, a through hole is provided on the retaining ring, and a fastener is provided in the through hole. The through hole is matched with the fastener and connected, and the fastener can pass through the through hole and abut against the extension. The end of the fastener can abut against the extension, which is conducive to the friction between the end of the fastener and the extension, thereby reducing the possibility of loose connection between the pump head and the pump body due to the rotation of the base relative to the extension, thereby improving the tightness of the connection between the pump head and the pump body.

[0010] Preferably, a first assembly hole is provided in the pump head, the pump body has a second assembly hole coaxial with and connected to the first assembly hole, the plunger rod assembly is cooperatively arranged in the first assembly hole, and the plunger rod assembly can axially displace in the first assembly hole and the second assembly hole.

[0011] Preferably, the plunger rod assembly includes a first rod body and a second rod body that are coaxially and detachably connected, the first rod body having a limit block at one end close to the second rod body, and the second rod body having a limit groove at the end face close to the first rod body, the limit groove passes through the side of the second rod body and forms an opening, the limit block can be inserted into the limit groove from the opening, and the limit block can rotate along the axial direction of the first rod body in the limit groove. The split design of the first rod body and the second rod body reduces the manufacturing difficulty of the plunger rod. When the conveying material needs to be replaced, the plunger rod in contact with the original material needs to be replaced synchronously. The plunger rod in this case is split into a first rod body and a second rod body that are detachably connected. By replacing the first rod body that cooperates with the pump head and its interior, the material conveying demand can be quickly matched, thereby improving the operating efficiency of the plunger pump in adapting to the material conveying demand, and only the disassembled rod body and pump head need to be cleaned and disinfected, without the need to operate the plunger rod as a whole, which reduces the difficulty of cleaning and disinfection while also reducing the economic and labor costs of cleaning and disinfection;

[0012] The limiting block can be inserted into and out of the limiting groove from the opening, so that the first rod body and the second rod body can be plugged in at the side, reducing the installation space required in the axial direction when the split plunger rod is assembled, and reducing the difficulty of assembling each rod body of the plunger rod. Moreover, since the limiting block can rotate in the limiting groove, that is, when the limiting block enters the limiting groove from the opening, it is only necessary to keep the first rod body and the second rod body parallel, and make the limiting block located on one side of the opening, without further adjusting the angle of the first rod body relative to the second rod body, the limiting block can enter the limiting groove from the opening, shortening the positioning time before the first rod body and the second rod body are assembled, and improving the positioning efficiency of each rod body before the segmented plunger rod is assembled; since the pump head and the pump body are detachably connected, the first rod body and the second rod body can be detached from each other in the radial direction of the opening, and when the pump head and the pump body are radially separated after the connecting piece is removed, the radial detachment of the first rod body and the second rod body can be achieved, that is, the detachment of the first rod body and the second rod body can be achieved synchronously by disassembling the pump head and the pump body, which greatly improves the disassembly efficiency of the segmented plunger rod.

[0013] Preferably, the limit block includes a first block and a second block, one end of the first block is connected to the first rod body, and the other end of the first block is connected to the second block, the bottom of the limit groove has a concentric first arc surface and a second arc surface, the first block cooperates with the first arc surface, and the second block cooperates with the second arc surface, and the curvature radius of the first arc surface is smaller than the curvature radius of the second arc surface. Since the first arc surface and the second arc surface cooperate with the first block and the second block respectively, and the limiting block as a whole can be rotated and inserted in the limiting groove, that is, the first block and the second block are cylindrical blocks, and since the curvature radius of the first arc surface is smaller than the curvature radius of the second arc surface, that is, the cylindrical surface diameter of the second block is larger than the cylindrical surface diameter of the first block, a step is generated at the connection between the first block and the second block. When the limiting block is inserted into the limiting groove, the second block is inserted and cooperates with the second arc surface, and the first block is inserted and cooperates with the first arc surface. At this time, the step between the first arc surface and the second arc surface forms an axial limit for the second block, thereby solving the possibility of the first rod body relative to the second rod body axially jumping to produce a gap or separation during the axial movement of the plunger rod. On the one hand, it reduces the possibility of the stroke position of the plunger rod in the conveying medium cavity changing during the conveying medium process, thereby maintaining the flow stability of the medium conveying by stabilizing the change amplitude of the conveying medium cavity;

[0014] The first arc surface and the second arc surface are arranged to provide support for the limit block that rotates into the limit groove, and at the same time, the arc surface can stabilize the posture of the limit block, thereby reducing the possibility of wear at the plug-in connection between the first rod body and the second rod body due to axial rotation of the first rod body relative to the second rod body during the movement of the plunger rod or the disassembly process. On the one hand, the problem of loose connection due to wear is solved, and the possibility of unstable flow of the transmission medium due to relative shaking of the first rod body relative to the second rod body is reduced. At the same time, the uniformity of the gap between the rod bodies in the conveying medium cavity is ensured, that is, the possibility of leakage of the conveying medium due to excessive local gaps is avoided.

[0015] Preferably, the extension length of the first arc surface along the axial direction of the second rod body is less than the thickness of the first block in the axial direction of the first rod body. In the process of inserting the limit block into the limit groove, the above scheme makes the end face of the first rod body connected to the first block not contact the end face of the second rod body where the limit groove is provided. On the one hand, it reduces the possibility of contact and wear between the first rod body and the second rod body at the end face caused by the movement of the plunger rod, prevents wear debris from contaminating the internal environment of the pump body and the pump head, and increases the difficulty of cleaning and disinfection. On the other hand, it avoids the friction generated by the end face contact and extrusion when the first rod body and the second rod body are separated, reduces the possibility that the first rod body and the second rod body are difficult to separate due to the end face contact and extrusion, and is conducive to improving the success rate of synchronous separation of the pump head and the pump body, and the first rod body and the second rod body, and improving the speed of flow adjustment.

[0016] Preferably, the first rod body is arranged in the first assembly hole, and the second rod body is arranged in the second assembly hole.

[0017] Since the present invention adopts a segmented radially plug-in plunger rod group, it has the following beneficial effects: the detachable manner of the pump head and the pump body of the present invention facilitates meeting different material conveying requirements; the pump head can be cleaned separately after replacement, which reduces economic and time costs; the threaded cooperation of the connecting piece reduces the possibility of deformation caused by stress concentration in the extension part, improves assembly accuracy and reduces maintenance costs; the cooperation between the circular hole and the cylindrical surface realizes axial constraint during the installation process of the base, and reduces the possibility of wear of the thread and the thread groove caused by the shaking of the base; the cooperation between the circular hole and the cylindrical surface is beneficial to the correction of the internal channel of the pump head and the pump body, and reduces the lateral interference of the plunger rod group; the cooperation between the circular hole and the cylindrical surface helps to ensure the stability of the position of the plunger rod group and improve the oil film characteristics of the plunger rod group. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a slot-jointed, twist-lock split pump head assembly;

[0019] Figure 2 It is a three-dimensional schematic diagram of a slot-jointed, screw-on split pump head assembly;

[0020] Figure 3 It is a cross-sectional schematic diagram of a slot-jointed, twist-lock split pump head assembly;

[0021] Figure 4 for Figure 3 A magnified schematic diagram of the middle A area;

[0022] Figure 5 It is a schematic diagram of the connecting piece and the pump body structure;

[0023] Figure 6 Schematic diagram of the structure of the plunger rod assembly;

[0024] Figure 7 It is a cross-sectional schematic diagram of the plunger rod assembly.

[0025] Reference numerals: pump head 1; pump body 2; extension portion 20; connecting member 3; base 31; retaining ring 32; fastener 33; plunger rod assembly 4; first rod body 41; second rod body 42; first block 5; first arc surface 50; second block 6; second arc surface 60. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below in conjunction with specific implementations and drawings:

[0027] 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.

[0028] See attached Figure 1 -Attached Figure 5 A slot-jointed screw-on split pump head assembly comprises: a detachably connected pump head 1 and a pump body 2, the pump head 1 and the pump body 2 are equipped with the same plunger rod group 4, a connecting piece 3 is provided on the periphery of the connection between the pump head 1 and the pump body 2, the connecting piece 3 is connected to the outside of the pump head 1 by threaded fitting, and the connecting piece 3 can squeeze the pump body 2 toward the pump head 1.

[0029] The connecting piece 3 realizes a detachable connection of the pump head 1 on the pump body 2. By removing and replacing the pump head 1 on the pump body 2, different material conveying requirements can be met, such as changing the type of conveyed material, the viscosity of the conveyed material, and the flow rate of the conveyed material. Since the pump head 1 is detachable, the cleaning work before replacing the material can be met by disassembling and cleaning the pump head 1 without replacing the pump head 1, thereby reducing economic and time costs. The connecting piece 3 makes the pump body 2 approach and squeeze the pump head 1, achieving close contact between the pump head 1 and the pump body 2, thereby ensuring that the pump head 1 and the pump body 2 are relatively stable, and reducing the possibility of wear between the two at the connection due to vibration interference.

[0030] The connecting member 3 includes a base 31 and a retaining ring 32 . The base 31 has a circular hole therethrough. A thread groove is provided on the hole wall of the circular hole. The outer side of the pump head 1 has a thread matching the thread groove. The retaining ring 32 is provided at one end of the base 31 and can abut against the pump body 2 .

[0031] The thread groove is arranged in the middle section of the circular hole to ensure that the circular hole has a smooth inner wall surface at the end.

[0032] The pump body 2 includes an extension portion 20 on its outer side. The extension portion 20 is arranged in cooperation with the pump head 1. The extension portion 20 has an end face away from the pump head 1. The retaining ring 32 is matched with the end face and can abut against the end face.

[0033] When connecting the pump head 1 and the pump body 2, the pump head 1 and the pump body 2 are matched, and the screw groove of the base 31 is matched with the screw thread on the outside of the pump head 1 to realize the rotation of the base 31 on the periphery of the pump head 1. During the rotation of the base 31, the retaining ring 32 is synchronously brought close to and contacts the extension part 20 of the pump head 1. By further rotating the base 31, the retaining ring 32 at one end of the base 31 can press the extension part 20 toward the direction of the pump head 1, thereby realizing the connection between the pump head 1 and the pump body 2.

[0034] During the process of rotation and sliding of the base 31 through threaded cooperation, the thread grooves constrain the threads to each other, which can ensure that the base 31 moves in a straight line when approaching the pump head 1 and clamping the extension part 20, thereby ensuring that the pump head 1 and the base 31 continue to clamp the extension part 20. The two sides of the extension part 20 are subjected to reverse and uniform clamping forces, thereby improving the contact tightness between the extension part 20 and the pump head 1 and the base 31 at the cooperation points, reducing the possibility of deformation of the extension part 20 due to local stress concentration, improving assembly accuracy and reducing maintenance costs.

[0035] The extension part 20 and the pump head 1 have coaxial and equal-sized cylindrical surfaces on the outside, and the cylindrical surfaces fit in the circular hole.

[0036] The base 31 can be sleeved on the outside of the pump head 1 through the circular hole. When the base 31 is threadedly fitted on the outside of the pump head 1, the circular hole is formed on the outside of the cylindrical surface through the inner wall surface. On the one hand, the guidance and axial constraint of the rotational sliding of the base 31 are realized, and the possibility of the base 31 shaking during the connection process causing the thread groove and the thread to not fit in place and squeeze each other is reduced, and the possibility of wear between the thread and the thread groove is reduced, while also improving the efficiency of the assembly of the pump head 1 and the pump body 2. On the other hand, the alignment of the cylindrical surfaces of the pump head 1 and the pump body 2 is realized when the pump head 1 and the pump body 2 are connected, which is beneficial to the repair and alignment of the internal channel of the pump head 1 and the internal channel of the pump body 2, thereby avoiding lateral interference with the plunger rod group 4 caused by channel misalignment, reducing the possibility of wear on the outer wall of the plunger rod group 4, and at the same time reducing the vibration of the plunger rod group 4, ensuring the stability of the position of the plunger rod group 4 in the pump head 1 and the internal channel of the pump body 2, which is beneficial to improving the oil film characteristics of the plunger rod group 4 in the plunger.

[0037] The retaining ring 32 is provided with a through hole, and the through hole is equipped with a fastener 33 . The through hole and the fastener 33 are matched and connected. The fastener 33 can pass through the through hole and abut against the extension portion 20 .

[0038] The end of the fastener 33 can abut the extension part 20, which is beneficial to the friction force between the end of the fastener 33 and the extension part 20, thereby reducing the possibility of the base 31 rotating relative to the extension part 20 and causing the connection between the pump head 1 and the pump body 2 to loosen, thereby improving the tightness of the connection between the pump head 1 and the pump body 2.

[0039] The fastener 33 includes a column, the through hole is a threaded hole, the outer wall of the column has an external thread structure, the external thread structure cooperates with the threaded hole, one end of the column has a head, the head is used to limit the movement of the column in the through hole, and the other end of the column has an abutment portion, which can contact and squeeze the extension portion 20.

[0040] When the connecting piece 3 forms the assembly of the pump head 1 and the pump body 2, the column is inserted into the through hole. Under the cooperation of the external thread structure and the threaded hole, the column rotates and slides in the through hole and the abutment portion continues to approach the extension portion 20. The column is further rotated. Under the limiting effect of the external thread structure and the threaded hole, the column can carry the connecting piece 3 that is matched with it away from the pump head 1. That is, at this time, the thread groove on the inner side of the base 31 and the thread on the pump head 1 move relative to each other in the axial direction, so as to realize the axial compression of the thread and the thread groove. On the one hand, the sealing performance of the connection between the pump head 1 and the pump body 2 is improved. On the other hand, the close contact between the thread and the thread groove can reduce the possibility of the pump head 1 shaking relative to the pump body 2, thereby reducing the possibility of the connecting piece 3 loosening and gradually disengaging at the threaded cooperation. That is, the axial locking of the connecting piece 3 is realized by enlarging the gap between the retaining ring 32 and the extension portion 20 by the connecting piece 3, thereby reducing the manufacturing difficulty and assembly accuracy requirements of the thread groove in the connecting piece 3 and the thread outside the pump head 1.

[0041] The above scheme realizes axial limitation of the connecting piece 3 at the connection between the pump head 1 and the pump body 2, thereby stabilizing the position of the pump head 1 relative to the pump body 2, avoiding a gap between the two resulting in the plunger rod failing to reach a preset stroke in the medium containing chamber in the pump head 1. When faced with high-viscosity media, sufficient pressure cannot be provided in the medium containing chamber, resulting in difficulty in efficiently conveying high-viscosity materials.

[0042] A first assembly hole is provided in the pump head 1, and the pump body 2 has a second assembly hole coaxial with and connected to the first assembly hole. The plunger rod group 4 is cooperatively arranged in the first assembly hole, and the plunger rod group 4 can axially move in the first assembly hole and the second assembly hole.

[0043] See attached Figure 6 -Attached Figure 7The plunger rod group 4 includes a first rod body 41 and a second rod body 42 that are coaxial and detachably connected. The first rod body 41 has a limit block at one end close to the second rod body 42. The second rod body 42 has a limit groove on its end face close to the first rod body 41. The limit groove passes through the side of the second rod body 42 and forms an opening. The limit block can be inserted into the limit groove from the opening, and the limit block can rotate in the limit groove along the axial direction of the first rod body 41. The split design of the first rod body 41 and the second rod body 42 reduces the difficulty of manufacturing the plunger rod. When the conveying material needs to be replaced, 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 41 and a second rod body 42. By replacing the first rod body 41 that cooperates with the pump head 1 and its interior, the material conveying demand can be quickly matched, thereby improving the operating efficiency of the plunger pump in adapting to the material conveying demand. In addition, only the disassembled rod body and the pump head 1 need to be cleaned and disinfected, and there is no need to operate the entire plunger rod, which reduces the difficulty of cleaning and disinfection, and also reduces the economic and labor costs of cleaning and disinfection.

[0044] The limiting block can be inserted into and out of the limiting groove from the opening, so that the first rod body 41 and the second rod body 42 can be plugged in at the side, which reduces the installation space required in the axial direction when the split plunger rod group 4 is assembled, and reduces the difficulty of assembling each rod body of the plunger rod. In addition, since the limiting block can rotate in the limiting groove, that is, when the limiting block enters the limiting groove from the opening, it is only necessary to keep the first rod body 41 and the second rod body 42 parallel, and make the limiting block located on one side of the opening, without further adjusting the angle of the first rod body 41 relative to the second rod body 42, and the limiting block can enter the limiting groove from the opening, thereby shortening the time. The positioning time before the first rod body 41 and the second rod body 42 are assembled improves the positioning efficiency of each rod body before the segmented plunger rod group 4 is installed; since the pump head 1 and the pump body 2 are detachably connected, the first rod body 41 and the second rod body 42 can be separated from each other in the radial direction of the opening. After the connecting piece 3 is removed, when the pump head 1 and the pump body 2 are radially separated, the first rod body 41 and the second rod body 42 can be separated in the radial direction, that is, the disassembly of the pump head 1 and the pump body 2 can synchronously achieve the disassembly of the first rod body 41 and the second rod body 42, which greatly improves the disassembly efficiency of the segmented plunger rod.

[0045] The limiting block includes a first block 5 and a second block 6. One end of the first block 5 is connected to the first rod body 41, and the other end of the first block 5 is connected to the second block 6. The bottom of the limiting groove has a concentric first arc surface 50 and a second arc surface 60. The first block 5 cooperates with the first arc surface 50, and the second block 6 cooperates with the second arc surface 60. The curvature radius of the first arc surface 50 is smaller than the curvature radius of the second arc surface 60. Since the first arc surface 50 and the second arc surface 60 cooperate with the first block 5 and the second block 6 respectively, and the limiting block as a whole can be rotated and inserted in the limiting groove, that is, the first block 5 and the second block 6 are cylindrical blocks, and since the curvature radius of the first arc surface 50 is smaller than the curvature radius of the second arc surface 60, that is, the cylindrical surface diameter of the second block 6 is larger than the cylindrical surface diameter of the first block 5, a step is generated at the connection between the first block 5 and the second block 6. When the limiting block is inserted into the limiting groove, the second block 6 is inserted and cooperates with the second arc surface 60, and the first block 5 is inserted and cooperates with the first arc surface 50. At this time, the step between the first arc surface 50 and the second arc surface 60 forms an axial limit for the second block 6, thereby solving the possibility of the first rod body 41 axially jumping relative to the second rod body 42 to produce a spacing or separation during the axial movement of the plunger rod. On the one hand, it reduces the possibility of the stroke position of the plunger rod in the conveying medium cavity changing during the conveying medium process, thereby maintaining the flow stability of the medium conveying by stabilizing the change amplitude of the conveying medium cavity;

[0046] The first arc surface 50 and the second arc surface 60 are arranged to provide support for the limit block that rotates into the limit groove. At the same time, the arc surface can stabilize the posture of the limit block, thereby reducing the possibility of wear at the plug-in connection between the first rod body 41 and the second rod body 42 due to axial rotation of the first rod body 41 relative to the second rod body 42 during the movement or disassembly of the plunger rod. On the one hand, the problem of loose connection due to wear is solved, and the possibility of unstable flow of the transmission medium due to relative shaking of the first rod body 41 relative to the second rod body 42 is reduced. At the same time, the uniformity of the gap between the rod bodies in the conveying medium cavity is ensured, that is, the possibility of leakage of the conveying medium due to excessive local gaps is avoided.

[0047] The extension length of the first arc surface 50 along the axial direction of the second rod body 42 is smaller than the thickness of the first block 5 in the axial direction of the first rod body 41 .

[0048] During the process of inserting the limit block into the limit groove, the above scheme ensures that the end face of the first rod body 41 connected to the first block body 5 does not contact the end face of the second rod body 42 where the limit groove is provided. On the one hand, it reduces the possibility of contact and wear between the first rod body 41 and the second rod body 42 at the end faces caused by the movement of the plunger rod, prevents wear debris from contaminating the internal environment of the pump body 2 and the pump head 1, and increases the difficulty of cleaning and disinfection. On the other hand, it avoids the friction force generated by the end face contact and extrusion when the first rod body 41 and the second rod body 42 are separated, reduces the possibility of the first rod body 41 and the second rod body 42 being difficult to separate due to the end face contact and extrusion, and is conducive to improving the success rate of synchronous separation of the pump head 1 and the pump body 2, and the first rod body 41 and the second rod body 42, and improving the speed of flow adjustment.

[0049] The first rod body 41 is disposed in the first assembly hole, the second rod body 42 is disposed in the second assembly hole, and one end of the second rod body 42 without the limiting groove is connected to the power mechanism.

[0050] The pump head 1 is provided with a first groove inwardly at the end surface close to the pump body 2, and the first assembly hole is connected with the first groove. The pump body 2 is provided with a second groove inwardly at the end surface close to the pump head 1, and the second assembly hole is connected with the second groove. The first groove and the second groove form a accommodating cavity, and the first rod body 41 can carry the limit block to move axially in the accommodating cavity.

[0051] At least one of the pump head 1 and the pump body 2 is provided with an operation hole, and the operation hole is connected to the accommodating cavity.

[0052] The number of the plunger rod groups 4 includes but is not limited to two. When the number of the plunger rod groups 4 is greater than or equal to two, the plunger rod groups 4 are symmetrically and parallelly arranged.

[0053] When the pump head 1 and the pump body 2 lose the restriction of the connecting piece 3, the pump head 1 and the pump body 2 can be disengaged axially or radially by inserting a tool into the operating hole and using the tool to adjust and rotate the plunger rod group 4 so that the openings of the limit grooves of the two plunger rod groups 4 face the same direction. At this time, the pump head 1 is disengaged from the pump body 2 along the opening direction, and the disengagement of multiple groups of first rod bodies 41 relative to the second rod bodies 42 can be achieved. That is, in the case of multiple groups of plunger rod groups 4, the multiple groups of plunger rod groups 4 can be disassembled by disengaging the pump head 1 from the pump body 2 once, which greatly improves the disassembly efficiency and shortens the time consumed for material replacement or flow adjustment.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A slot-jointed, twist-lock split pump head assembly, comprising: A pump head (1) and a pump body (2) are detachably connected, wherein the pump head (1) and the pump body (2) are equipped with the same plunger rod assembly (4), and the characteristics are that: a connecting piece (3) is provided on the periphery of the connection between the pump head (1) and the pump body (2), and the connecting piece (3) is connected to the outside of the pump head (1) by threaded fitting, and the connecting piece (3) can make the pump body (2) squeeze toward the pump head (1), The connecting member (3) comprises a base (31) and a retaining ring (32); the base (31) has a circular hole extending therethrough; a thread groove is provided on the hole wall of the circular hole; the outer side of the pump head (1) has a thread that cooperates with the thread groove; the retaining ring (32) is arranged at one end of the base (31); a through hole is provided on the retaining ring (32); the through hole is provided with a fastener (33); the pump body (2) comprises an extension portion (20) on the outer side thereof; the extension portion (20) is provided in cooperation with the pump head (1); the fastener (33) can pass through the through hole and abut against the extension portion (20); the fastener (33) comprises a column; the through hole is a threaded hole; the outer wall of the column has an external thread structure; the external thread structure cooperates with the threaded hole; The plunger rod assembly (4) comprises a first rod body (41) and a second rod body (42) which are coaxial and detachably connected, wherein one end of the first rod body (41) close to the second rod body (42) is provided with a limit block, and the end surface of the second rod body (42) close to the first rod body (41) is provided with a limit groove, wherein the limit groove passes through the side surface of the second rod body (42) and forms an opening, wherein the limit block can be inserted into the limit groove through the opening, and the limit block can rotate in the limit groove along the axial direction of the first rod body (41).

2. The slot-jointed twist-lock split pump head assembly according to claim 1 is characterized in that: The retaining ring (32) can abut against the pump body (2).

3. The slot-jointed twist-lock split pump head assembly according to claim 1 is characterized in that: The extension portion (20) has an end surface away from the pump head (1), and the retaining ring (32) cooperates with the end surface, and the retaining ring (32) can abut against the end surface.

4. The slot-jointed twist-lock split pump head assembly according to claim 3 is characterized by: The extension portion (20) and the pump head (1) have coaxial and equal-sized cylindrical surfaces on the outside, and the cylindrical surfaces fit in the circular hole.

5. The slot-jointed twist-lock split pump head assembly according to claim 3 is characterized by: The through hole is cooperatively connected with the fastener (33), and the fastener (33) can pass through the through hole and abut against the extension portion (20).

6. The slot-jointed twist-lock split pump head assembly according to claim 1 is characterized by: The pump head (1) is provided with a first assembly hole, the pump body (2) has a second assembly hole coaxial with and connected to the first assembly hole, the plunger rod assembly (4) is cooperatively arranged in the first assembly hole, and the plunger rod assembly (4) can be axially displaced in the first assembly hole and the second assembly hole.

7. The slot-jointed twist-lock split pump head assembly according to claim 6 is characterized by: The limiting block comprises a first block (5) and a second block (6); one end of the first block (5) is connected to the first rod (41); the other end of the first block (5) is connected to the second block (6); the bottom of the limiting groove has a concentric first arc surface (50) and a second arc surface (60); the first block (5) cooperates with the first arc surface (50); the second block (6) cooperates with the second arc surface (60); the curvature radius of the first arc surface (50) is smaller than the curvature radius of the second arc surface.

8. The slot-jointed twist-lock split pump head assembly according to claim 7 is characterized in that: The extension length of the first arc surface (50) along the axial direction of the second rod body (42) is smaller than the thickness of the first block (5) in the axial direction of the first rod body (41).

9. The slot-jointed twist-lock split pump head assembly according to claim 8, characterized in that: The first rod body (41) is disposed in the first assembly hole, and the second rod body (42) is disposed in the second assembly hole.

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