A split pump head assembly for tightening a split plunger rod

Abstract

The present invention belongs to the technical field of plunger pumps, and provides a tapped pump head assembly for tightening a split plunger rod. The present invention includes a pump head and a pump body, wherein a plunger rod is arranged inside the pump head and the pump body, and the plunger rod includes a first plunger section and a second plunger section connected to each other, and the first plunger section and the second plunger section are connected by a threaded structure extending along the axial direction. The first plunger section and the second plunger section are connected by a threaded structure extending along the axial direction, so as to maintain the coaxiality of the split plunger rod, reduce the difficulty of assembly, and reduce the time cost of disassembling and assembling the pump head and the plunger rod; the threaded connection is a rigid connection, which can withstand the loads in all directions during the reciprocating motion of the plunger rod, and the relative positions of the various rods of the split plunger rod will not be displaced, so as to ensure that the stroke of the plunger rod does not change, and maintain the reliable volumetric efficiency of the plunger pump.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps and provides a tapped pump head assembly for tightening a split plunger rod. Background Art

[0002] With the development of plunger pump technology, plunger pumps have the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation, replacing stainless steel gear pumps or vane pumps to provide a suitable production environment. However, plunger pumps are divided into integrated plunger pumps and split plunger pumps. The integrated plunger pump uses an integrated plunger rod and a pump head that is not detachably connected by welding, which leads to high use costs and difficult maintenance of the integrated plunger pump, and cannot meet the sanitation needs and various flow requirements of the food, pharmaceutical and biochemical industries; the pump head of the split plunger pump is separated from other parts to meet the disassembly requirements of the pump head, but the plunger rod uses an integrated plunger rod, which still cannot meet the sanitation needs and various flow requirements in the industry. For this reason, a detachable plunger pump is needed to deal with the above problems. Prior art CN111065820B relates to a plunger pump, in which the pump head is finally fixed to the pump body by bolts and other fixing members, but before the fixing member is used to fix it to the pump body, it can move relative to the pump body in a direction perpendicular to the axial direction of the plunger. In this state, if the plunger drive unit is moved to a specified position on the front end side of the pump body and the pump head is engaged with the plunger drive unit, the pump head is positioned at a position where the center axis of the plunger is substantially consistent with the center axis of the pump chamber. By fixing the pump head to the pump body using a fixing member at this position, the plunger pump can be assembled in a state where the center axis of the plunger is substantially consistent with the center axis of the pump chamber. The prior art is only applicable to the assembly of the pump head and the pump body, and cannot realize the split assembly and disassembly of the plunger rod. The inventor believes that there is a large 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, maintain the reliability of the split plunger rod with the integrated plunger rod, maintain the cylindricity and coaxiality of the split plunger rod, reduce the difficulty of assembly, and reduce the time cost of disassembling the pump head and the plunger rod. Secondly, it can ensure the coaxiality of each rod member of the split plunger rod, avoid serious wear of the plunger rod during reciprocating motion; avoid gaps between the various rod members of the split plunger rod, and avoid wear caused by mutual collision during operation. To this end, the present invention provides a split pump head assembly for tightening the 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 plunger rod includes a first plunger section and a second plunger section connected, and the first plunger section and the second plunger section are connected by a threaded structure extending along the axial direction. A threaded structure is used to connect the first plunger section and the second plunger section to maintain the coaxiality of the split plunger rod, reduce the difficulty of assembly, and reduce the time cost of disassembling the pump head and the plunger rod; the threaded connection is a rigid connection, which can withstand the axial loads during the reciprocating motion of the plunger rod, and the relative positions of the various rods of the split plunger rod will not be displaced, which can ensure that the stroke of the plunger rod does not change, and maintain the plunger pump with reliable volumetric efficiency.

[0004] Preferably, the threaded structure includes a threaded hole and a threaded rod, an elastomer is arranged inside the threaded hole, one end of the elastomer abuts the bottom of the threaded hole, and the other end of the elastomer abuts the end of the threaded rod. Further, the elastomer is a steel spring, and the threaded connection has good sealing performance. The elastomer inside the threaded hole is difficult to contact corrosive liquid and age, which can ensure the service life of the elastomer; the spring can compress the threaded structure between the first plunger section and the second plunger section, enhance the sealing performance of the threaded connection, and avoid the gap between the threads, so that the first plunger section can move axially relative to the second plunger section. Since the plunger rod needs to perform frequent reciprocating motion, the axial movement of the first plunger section will seriously wear the thread of the threaded connection, reducing the service life of the first plunger section and the second plunger section, and after the thread is worn, the distance that the first plunger section can periodically move axially increases, and each rod of the split plunger rod undergoes more severe periodic impact, and the volumetric efficiency of the pump head pulsates, affecting the fluid delivery of the plunger pump.

[0005] Preferably, the outer wall surface of the second plunger section is provided with knurled grooves distributed along the axial direction, and the knurled grooves are located in the part of the second plunger section away from the first plunger section. The knurled grooves are distributed axially along the outer wall surface of the second plunger section, and the knurled grooves have a guiding effect on the reciprocating linear motion of the plunger rod; since the surface of the plunger rod has a lubricating medium when working, the knurled grooves are provided to increase the friction force when the second plunger section is rotated, which is convenient for screwing the second plunger section to contact the threaded connection with the first plunger section; the knurling is provided by cutting the groove body on the surface of the second plunger section to avoid knurling wear.

[0006] Preferably, the end face of the first plunger section close to the second plunger section is provided with a threaded hole, and the second plunger section is provided with a threaded rod that matches the threaded hole. Since the second plunger section is close to the pump head, during the assembly and disassembly process, the pump head end is usually disassembled or assembled last, and the first plunger section close to the power end of the plunger pump does not need to be disassembled or pre-set, so the second plunger section is provided with a threaded rod and the first plunger section is provided with a threaded hole, which reduces the difficulty of assembly and disassembly and conforms to the assembly and disassembly habits; and the first plunger section is provided with a threaded hole, which is conducive to measuring and controlling the coaxiality of the first plunger section and the internal cavity of the pump body, ensuring that the assembly has a high precision.

[0007] Preferably, the plunger rod further comprises a third plunger section, which is located on a side of the second plunger section away from the first plunger section, one end of the third plunger section moves inside the pump head, and the third plunger section is a rotating body. The third plunger section is provided as a contact section between the plunger rod and the fluid conveyed in the pump head, which is conducive to replacing and adjusting the material of the third plunger section to adapt to fluids of different properties, avoiding the replacement of the plunger rod as a whole, and reducing the manufacturing cost of the plunger rod; since the first plunger section and the second plunger section are connected by threads, the third plunger section also needs to be rotated during the assembly and disassembly process, and the third plunger section is made into a rotating body, which can ensure that the sealing performance between the plunger rod and the pump head will not change during the assembly and disassembly process.

[0008] Preferably, the pump body includes a first pump body and a second pump body, a vertical guide mechanism is provided between the first pump body and the second pump body, a stopper is provided at the end of the guide mechanism, and the stopper includes a first stopper and a second stopper, the first stopper is located at the bottom of the second pump body, and the second stopper is located at the top of the protected first pump body. The vertical guide mechanism is provided, and the stopper is provided at the end of the guide mechanism, which is conducive to the installation of the first pump body and the second pump body by their own weight, and the stopper ensures that the two parts are quickly and accurately installed in the corresponding positions; and when the installation conditions are limited, because the guide mechanism is a vertical open mechanism, the stopper is located at the end of the guide mechanism, and the first pump body and the second pump body can be installed in the horizontal direction.

[0009] Preferably, the guide mechanism includes a slide groove, and the second pump body is provided with a slide groove, the slide groove includes a first groove section and a second groove section, the second groove section is a vertical groove, and the first groove section and the second groove section have an angle α. The angle α is an obtuse angle. Due to the existence of the angle α, the distance between the slide grooves on both sides of the guide mechanism gradually decreases at the second groove section, which can guide the first pump body and the second pump body to align to the assembly position, and when the end stopper of the guide mechanism fails, the first pump body is clamped by the second pump bodies on both sides to prevent the first pump body and the pump head from sliding down or even falling, and when the first pump body is subjected to abnormal load or impact, the second pump body can bear loads in different directions.

[0010] Preferably, the guide mechanism further comprises a slider, the first pump body is provided with at least two sliders, and the first slot section and the second slot section each have at least one slider matched. Multiple sliders can increase the assembly connection points of the first pump body and the second pump body in the vertical direction, improve the connection stability of the first pump body and the second pump body; avoid the relative tilt of the first pump body and the second pump body due to the smaller size of the slider relative to the pump body and the gap in the slide groove, which affects the parallelism of the first pump body and the second pump body during the splicing process; when the first pump body and the second pump body are spliced ​​in the horizontal direction, the V-shaped angle of the V-shaped block has a horizontal guiding effect, which is different from the direction of the guide mechanism.

[0011] The present invention provides a split pump head assembly for tightening a split plunger rod, which maintains the reliability of the split plunger rod with an integrated plunger rod, maintains the cylindricity and coaxiality of the split plunger rod, reduces the difficulty of assembly, and reduces the time cost of disassembling and assembling the pump head and the plunger rod; can ensure the coaxiality of each rod member of the split plunger rod, and avoids severe wear of the plunger rod during reciprocating motion; avoids gaps between each rod member of the split plunger rod, and avoids wear caused by mutual collision during operation, and has the following beneficial effects: maintains the coaxiality of the split plunger rod, reduces the difficulty of assembly, and reduces the time cost of disassembling and assembling the pump head and the plunger rod; threaded connection The connection is a rigid connection, which can withstand the axial loads during the reciprocating motion of the plunger rod, and the relative positions of the various rods of the split plunger rod will not be displaced, which can ensure that the stroke of the plunger rod does not change, and maintain the reliable volumetric efficiency of the plunger pump; avoid gaps between the threads, avoid the axial movement of the first plunger section will seriously wear the threads of the threaded connection, reduce the service life of the first plunger section and the second plunger section, and after the threads are worn, the axial movement distance of the first plunger section increases, the various rods of the split plunger rod will experience more severe periodic impacts, the volumetric efficiency of the pump head will pulsate, and affect the fluid delivery of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0013] Figure 1 It is a schematic structural diagram of the plunger pump of the present invention;

[0014] Figure 2 It is a structural schematic diagram of the first pump body of the present invention;

[0015] Figure 3 It is a structural schematic diagram of the second pump body of the present invention;

[0016] Figure 4 It is a structural schematic diagram of the plunger rod of the present invention;

[0017] Figure 5 It is a schematic diagram of the disassembly of the plunger rod of the present invention;

[0018] Figure 6 It is a structural cross-sectional view of the plunger rod of the present invention.

[0019] Explanation of the reference numerals: 1 first pump body; 101 second stopper body; 102 slider; 2 second pump body; 201 first groove section; 202 second groove section; 203 first stopper body; 3 third pump body; 4 plunger rod; 401 first plunger section; 402 second plunger section; 403 third plunger section; 404 threaded rod; 405 elastomer; 406 threaded hole; 5 pump head; 6 first fastener; 7 second fastener; 8 third fastener. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Embodiment 1

[0022] like Figure 1 As shown, a split pump head assembly for tightening a split plunger rod includes a pump head 5 and a pump body, wherein a plunger rod 4 is arranged inside the pump head 5 and the pump body, and the plunger rod 4 includes a first plunger section 401 and a second plunger section 402 connected to each other, and the first plunger section 401 and the second plunger section 402 are connected by a threaded structure extending along the axial direction. The first plunger section 401 and the second plunger section 402 are connected by a threaded structure, so as to maintain the coaxiality of the split plunger rod 4, reduce the difficulty of assembly, and reduce the time cost of disassembling and assembling the pump head 5 and the plunger rod 4; the threaded connection is a rigid connection, which can withstand the loads in all directions during the reciprocating motion of the plunger rod 4, and the relative positions of the various rods of the split plunger rod 4 will not be displaced, so as to ensure that the stroke of the plunger rod 4 does not change, and maintain the reliable volumetric efficiency of the plunger pump.

[0023] Combination Figure 4 , Figure 5 and Figure 6As shown, the threaded structure includes a threaded hole 406 and a threaded rod 404 . An elastic body 405 is provided inside the threaded hole 406 . One end of the elastic body 405 abuts against the bottom of the threaded hole 406 , and the other end of the elastic body 405 abuts against the end of the threaded rod 404 . Furthermore, the elastomer 405 is a steel spring, and has good sealing performance by adopting a threaded connection. The elastomer 405 inside the threaded hole 406 is not easy to be exposed to corrosive liquid and aged, and the service life of the elastomer 405 can be guaranteed; the spring can compress the threaded structure between the first plunger section 401 and the second plunger section 402, and enhance the sealing performance of the threaded connection while avoiding the gap between the threads, so that the first plunger section 401 can move axially relative to the second plunger section 402. Since the plunger rod 4 needs to perform frequent reciprocating motions, the axial movement of the first plunger section 401 will seriously wear the threads of the threaded connection, reducing the service life of the first plunger section 401 and the second plunger section 402. After the threads are worn, the distance that the first plunger section 401 can move axially increases, and the various rods of the split plunger rod 4 are subjected to more severe periodic impacts, and the volumetric efficiency of the pump head 5 pulsates, affecting the fluid delivery of the plunger pump.

[0024] Combination Figure 4 and Figure 5 As shown, the outer wall surface of the second plunger segment 402 is provided with knurled grooves distributed along the axial direction, and the knurled grooves are located in the part of the second plunger segment 402 away from the first plunger segment 401. The knurled grooves are distributed axially along the outer wall surface of the second plunger segment 402, and the knurled grooves have a guiding effect on the reciprocating linear motion of the plunger rod 4; since the surface of the plunger rod 4 has a lubricating medium when working, the knurled grooves are provided to increase the friction force when the second plunger segment 402 is rotated, which is convenient for screwing the second plunger segment 402 to contact the threaded connection with the first plunger segment 401; the knurling is provided by cutting the groove body on the surface of the second plunger segment 402 to avoid knurling wear.

[0025] Combination Figure 5 and Figure 6 As shown, the end surface of the first plunger section 401 close to the second plunger section 402 is provided with a threaded hole 406, and the second plunger section 402 is provided with a threaded rod 404 that matches the threaded hole 406. Since the second plunger section 402 is close to the pump head 5, during the assembly and disassembly process, the disassembly or last assembly usually starts from the pump head 5 end, and the first plunger section 401 close to the power end of the plunger pump does not need to be disassembled or pre-set, so the second plunger section 402 is provided with a threaded rod 404, and the first plunger section 401 is provided with a threaded hole 406, which reduces the difficulty of assembly and disassembly and conforms to the assembly and disassembly habits; and the first plunger section 401 is provided with a threaded hole 406, which is conducive to measuring and controlling the coaxiality of the first plunger section 401 and the internal cavity of the pump body, and ensuring that the assembly has a high precision.

[0026] The plunger rod 4 also includes a third plunger section 403, which is located on the side of the second plunger section 402 away from the first plunger section 401, and one end of the third plunger section 403 moves inside the pump head 5, and the third plunger section 403 is a rotating body. The third plunger section 403 is set as the contact section for conveying fluid in the plunger rod 4 and the pump head 5, which is conducive to replacing and adjusting the material of the third plunger section 403 to adapt to fluids of different properties, avoiding the overall replacement of the plunger rod 4, and reducing the manufacturing cost of the plunger rod 4; since the first plunger section 401 and the second plunger section 402 are threadedly connected, the third plunger section 403 also needs to be rotated during the assembly and disassembly process, and 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 5 will not change during the assembly and disassembly process.

[0027] like Figure 1 As shown, the pump body includes a first pump body 1 and a second pump body 2, a vertical guide mechanism is provided between the first pump body 1 and the second pump body 2, a baffle body is provided at the end of the guide mechanism, the baffle body includes a first baffle body 203 and a second baffle body 101, the first baffle body 203 is located at the bottom of the second pump body 2, the second baffle body is located at the top of the protected first pump body 1, the baffle body also includes a second baffle body 101, the top of the first pump body 1 is provided with the second baffle body 101, the second baffle body 101 is located above the second pump body 2, a first fastener 6 is vertically provided at the second baffle body 101, the first fastener 6 connects the first pump body 1 and the second pump body 2; the pump body also includes a third pump body 3, an axial second fastener 7 and a radial third fastener 8 are provided between the second pump body 2 and the third pump body 3. A vertical guide mechanism is provided, and a baffle is provided at the end of the guide mechanism, which is beneficial for the first pump body 1 and the second pump body 2 to be installed by their own weight, and the baffle ensures that the two parts are installed quickly and accurately at the corresponding positions; and when the installation conditions are restricted, since the guide mechanism is a vertical open mechanism and the baffle is located at the end of the guide mechanism, the first pump body 1 and the second pump body 2 can be installed in the horizontal direction.

[0028] like Figure 2 As shown, the guide mechanism also includes a slider 102, the first pump body 1 is provided with at least two sliders 102, and the first slot section 201 and the second slot section 202 are matched with at least one slider 102. Multiple sliders 102 can increase the assembly connection points of the first pump body 1 and the second pump body 2 in the vertical direction, and improve the connection stability of the first pump body 1 and the second pump body 2; avoid the relative tilt of the first pump body 1 and the second pump body 2 due to the smaller size of the slider 102 relative to the pump body and the gap in the slide groove, which affects the parallelism of the first pump body 1 and the second pump body 2 during the splicing process; when the first pump body 1 and the second pump body 2 are spliced ​​in the horizontal direction, the V-shaped angle of the V-shaped block has a horizontal guiding effect, which is different from the direction of the guide mechanism.

[0029] like Figure 3As shown, the guide mechanism includes a slide groove, and the second pump body 2 is provided with a slide groove, and the slide groove includes a first groove section 201 and a second groove section 202, and the second groove section 202 is a vertical groove, and the first groove section 201 and the second groove section 202 have an angle α. In this embodiment, the angle α is 105°. Due to the existence of the angle α, the distance between the slide grooves on both sides of the guide mechanism gradually decreases at the second groove section 202, which can guide the first pump body 1 and the second pump body 2 to align to the assembly position, and when the end stop of the guide mechanism fails, the first pump body 1 is clamped by the second pump body 2 on both sides to prevent the first pump body 1 and the pump head 5 from sliding down or even falling, and when the first pump body 1 is subjected to abnormal load or impact, the second pump body 2 can bear loads in different directions.

[0030] The present invention provides a split pump head assembly for tightening a split plunger rod, which maintains the reliability of the split plunger rod 4 with the integrated plunger rod 4, maintains the cylindricity and coaxiality of the split plunger rod 4, reduces the difficulty of assembly, and reduces the time cost of disassembling the pump head 5 and the plunger rod 4; can ensure the coaxiality of each rod member of the split plunger rod 4, avoids severe wear of the plunger rod 4 during reciprocating motion; avoids gaps between the various rod members of the split plunger rod 4, and avoids wear caused by mutual collision during operation, and has the following beneficial effects: maintains the coaxiality of the split plunger rod 4, reduces the difficulty of assembly, and reduces the time cost of disassembling the pump head 5 and the plunger rod 4; the threaded connection is rigid The split-type plunger rod 4 has a linear connection, which can withstand the axial loads during the reciprocating motion of the plunger rod 4, and the relative positions of the various rods of the split-type plunger rod 4 will not be displaced, which can ensure that the stroke of the plunger rod 4 does not change, and the plunger pump has a reliable volumetric efficiency; avoid gaps between the threads, avoid the axial movement of the first plunger segment 401 will seriously wear the threads of the threaded connection, and reduce the service life of the first plunger segment 401 and the second plunger segment 402. After the threads are worn, the axial movement distance of the first plunger segment 401 increases, the various rods of the split-type plunger rod 4 are subjected to more severe periodic impacts, and the volumetric efficiency of the pump head 5 pulsates, affecting the fluid delivery of the plunger pump.

[0031] The above embodiments and / or implementation methods are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

Claims

1. A split pump head assembly for tightening a split plunger rod, comprising a pump head (5) and a pump body, wherein the pump head (5) and the pump body are provided with a plunger rod (4), characterized in that: The plunger rod (4) comprises a first plunger section (401) and a second plunger section (402) which are connected to each other, and the first plunger section (401) and the second plunger section (402) are connected by a threaded structure extending along the axial direction; The pump body comprises a first pump body (1) and a second pump body (2); a vertical guide mechanism is provided between the first pump body (1) and the second pump body (2); a stopper is provided at the end of the guide mechanism; the stopper comprises a first stopper (203) and a second stopper (101); the first stopper (203) is located at the bottom of the second pump body (2), and the second stopper (101) is located at the top of the first pump body (1); The guide mechanism comprises a slide groove, the second pump body (2) is provided with a slide groove, the slide groove comprises a first groove section (201) and a second groove section (202), the second groove section (202) is a vertical groove, and the first groove section (201) and the second groove section (202) have an included angle α.

2. A split pump head assembly for tightening a split plunger rod according to claim 1, characterized in that: The threaded structure comprises a threaded hole (406) and a threaded rod (404); an elastic body (405) is provided inside the threaded hole (406); one end of the elastic body (405) abuts against the bottom of the threaded hole (406); and the other end of the elastic body (405) abuts against the end of the threaded rod (404).

3. A split pump head assembly for tightening a split plunger rod according to claim 2, characterized in that: The outer wall surface of the second plunger section (402) is provided with knurled grooves distributed along the axial direction, and the knurled grooves are located at a portion of the second plunger section (402) away from the first plunger section (401).

4. A split pump head assembly for tightening a split plunger rod according to claim 2, characterized in that: The threaded hole (406) is provided on the end surface of the first plunger section (401) close to the second plunger section (402), and the second plunger section (402) is provided with a threaded rod (404) that cooperates with the threaded hole (406).

5. A split pump head assembly for tightening a split plunger rod according to claim 1, characterized in that: The plunger rod (4) further comprises a third plunger section (403), the third plunger section (403) being located on a side of the second plunger section (402) away from the first plunger section (401), one end of the third plunger section (403) moving inside the pump head (5), and the third plunger section (403) being a rotating body.

6. A split pump head assembly for tightening a split plunger rod according to claim 1, characterized in that: The guide mechanism further comprises a slider (102), the first pump body (1) is provided with at least two sliders (102), and the first slot section (201) and the second slot section (202) each have at least one slider (102) matched therewith.

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