Plug-in pump head assembly for screwing split plunger rod

Abstract

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

Description

Technical Field

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

[0002] Due to the technological development of plunger pumps, plunger pumps have the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation, and can replace stainless steel gear pumps or vane pumps to provide more suitable production equipment for the food, pharmaceutical and biochemical industries. However, most existing plunger pumps are integrated plunger rods and pump heads that are not detachably connected by welding, which leads to high manufacturing costs and difficult maintenance of existing plunger pumps, and cannot meet the hygiene requirements and diverse flow requirements of the food, pharmaceutical and biochemical industries. Therefore, a detachable plunger pump is needed to address the above problems. Prior art CN213235340U is a double plunger rod pump, which includes: a fixed base, a pump body, a camshaft, a first cam, a second cam, a motor, a synchronous pulley device, and a pump head; the hollow pump body is arranged on the fixed base, the pump head is arranged at one end of the pump body, the pump head includes a first pump head and a second pump head, a guide rail is arranged in the pump body, and a first plunger rod and a second plunger rod are arranged in parallel on the guide rail; the first plunger rod is provided with a first plunger head at the opposite end, the second plunger rod is provided with a second plunger head at the opposite end, the first plunger rod is provided with a first bearing at the opposite end, and the second plunger rod is provided with a second bearing at the opposite end. The prior art adopts a split plunger rod, and a wear unit that is easy to remove is provided on the vulnerable part 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, simplify the assembly steps, reduce the time cost of disinfection and cleaning, and improve the sealing of the split pump body to avoid leakage of the medium in the plunger pump. Secondly, the ability of the split pump body to bear radial loads is improved, and a large-weight and large-structure pump head can be assembled; the ability of the pump body to withstand abnormal impacts and vibrations is improved, and the structural strength of the split pump body is improved. To this end, the present invention provides a plug-in pump head assembly for tightening a split plunger rod, including a pump head and a pump body, a plunger rod is provided inside the pump head and the pump body, and the pump body includes a first pump body and a second pump body connected to each other, the first pump body and the second pump body are nested in each other in the axial direction, and the contact surface of the first pump body and the second pump body is provided with a guide structure. The first pump body and the second pump body are nested with each other to improve the connection strength between the first pump body and the second pump body; the joint between the first pump body and the second pump body is changed, and the usual radial joint of the split pump body is converted into an axial joint, so as to avoid the leakage of the medium in the pump body due to gravity. In addition, the existing plunger pump is usually subjected to abnormal loads and impacts in the radial direction. Through the above-mentioned arrangement, the radial direction of the pump body joint is eliminated, which can improve the ability of the pump body to withstand abnormal radial impacts and vibrations; secondly, it is conducive to the assembly of large-structure or heavy-weight pump heads.

[0004] Preferably, a first elastic body is provided between the first pump body and the second pump body, one end of the first elastic body abuts the first pump body, and the other end of the first elastic body abuts the second pump body. Since the first pump body and the second pump body are nested with each other, the first pump body and the second pump body squeeze the first elastic body during the assembly process, and then are fixed by fasteners, the first elastic body can reduce the axial impact force of the first pump body and the second pump body when they are in place during assembly, and the impact force transferred along the second pump body during operation, so as to avoid damage to the power mechanism of the plunger pump; during the disassembly process, due to the presence of lubricating medium in the plunger pump, the nesting of the first pump body or the second pump body is not conducive to clamping and exiting, and the first pump body or the second pump body can be quickly ejected through the first elastic body, which is conducive to the rapid disassembly of the first pump body or the second pump body. Secondly, when the first pump body is connected to a heavy weight or large structure pump head, the first elastic body can assist in pushing out the first pump body, reducing the thrust required for disassembly and reducing labor intensity.

[0005] Preferably, the plug-in pump head assembly for tightening the split plunger rod further includes a fastener, which extends in the radial direction of the pump body and connects the first pump body and the second pump body. Since the first pump body and the second pump body are connected in a nested manner, the joint between the first pump body and the second pump body is a polygon around the axis of the pump body, and the use of radial fasteners can prevent the first pump body and the second pump body from relative movement along the axial direction, and improve the ability of the pump body to bear axial loads or impacts.

[0006] Preferably, the guide structure includes a first pump body whose cross section along the radial direction is a polygon, and the second pump body is provided with a matching polygonal cavity. The polygon has multiple edges, which have a guiding function, which is conducive to the nesting of the first pump body and the second pump body. At the same time, it can avoid the relative rotation of the first pump body and the second pump body during the installation process, which is conducive to the rapid positioning of the connection hole of the fastener; the polygonal pump body is easy to hold and carry, and it is not easy to slip out of the hand when the plunger pump is attached to the oily medium, which is convenient for manual rapid disassembly and assembly and disinfection and washing.

[0007] Preferably, the plunger rod comprises a first plunger section and a second plunger section, the first plunger section and the second plunger section are threadedly connected, the first plunger section and the second plunger section are both located in the internal movement of the pump body, the plunger rod also comprises a third plunger section, the third plunger section is a rotating body, the third plunger section is surrounded by a high-pressure sealing structure, one end of the third plunger section is located in the internal movement of the pump head, and the other end of the third plunger section is located in the internal movement of the pump body. The first plunger section is connected to the power mechanism of the plunger pump, and the third plunger section is close to the pump head. 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 axial 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, maintain the plunger pump with reliable volumetric efficiency and avoid abnormal axial vibration or impact; during the assembly and disassembly process, the third plunger section and the second plunger section are relatively fixed, so they also need to be rotated, 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 threaded connection includes a threaded hole and a threaded rod, a second elastic body is disposed inside the threaded hole, one end of the second elastic body abuts against the bottom of the threaded hole, and the other end of the second elastic body abuts against the end of the threaded rod. The second elastic body is used to compress the threads between the threaded rod and the threaded hole, thereby reducing the wear of the threaded hole caused by the axial movement of the threaded rod; the second elastic body can absorb the axial impact transmitted from the second plunger section to the first plunger section, thereby preventing the plunger rod from damaging the power mechanism of the plunger pump due to the axial impact during the reciprocating motion.

[0009] Preferably, the pump head is connected to the first pump body, and a sealing groove is provided on the connection surface of the pump head and the pump body, and a high-pressure sealing structure is provided in the sealing groove. There is a joint between the pump head and the first pump body, one end of the third plunger section is located in the internal movement of the pump head, and the other end of the third plunger section is located in the internal movement of the pump body, which is easy to bring out liquid, and a high-pressure sealing structure is provided to ensure the sealing between the pump head and the first pump body, and the high-pressure sealing structure cooperates with the third plunger section to reduce the wear of the joint between the pump head and the first pump body during the reciprocating movement of the third plunger section.

[0010] Preferably, the high-pressure sealing structure includes a first sealing sleeve and a sealing pressure ring, one end of the first sealing sleeve abuts against the first pump body, the other end of the sealing pressure ring abuts against the pump head, and the third plunger section is covered with the first sealing sleeve. The first sealing sleeve is in direct contact with the third plunger section, reducing the wear of the third plunger section during the reciprocating motion; the sealing pressure ring abuts against the pump head, and when the pump head squeezes the sealing pressure ring, the first sealing sleeve is squeezed, so that the first sealing sleeve and the third plunger section are squeezed and contacted with each other, thereby improving the sealing effect of the high-pressure sealing structure.

[0011] The present invention provides a plug-in pump head assembly for tightening a split plunger rod, so that the pump head and the matching plunger rod become replaceable parts, simplifying the assembly steps, reducing the time cost of disinfection and cleaning, and improving the sealing of the split pump body to avoid leakage of the medium in the plunger pump; improving the ability of the split pump body to bear radial loads, and being able to assemble a large-weight and large-structure pump head; improving the ability of the pump body to withstand abnormal impacts and vibrations, and improving the structural strength of the split pump body, and has the following beneficial effects: the first pump body and the second pump body are nested with each other, and the connection strength of the first pump body and the second pump body is improved; the joint between the first pump body and the second pump body is changed, and the usual radial joint of the split pump body is converted into an axial joint, so as to avoid leakage of the medium in the pump body, and the existing plunger pump is usually subjected to abnormal loads and impacts in the radial direction. Through the above-mentioned arrangement, the ability of the pump body to withstand abnormal impacts and vibrations can be improved; secondly, it is conducive to assembling a large-structure or large-weight pump head. 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; Figure 2 It is a disassembled schematic diagram of the plunger pump of the present invention; Figure 3 It is a cross-sectional structural schematic diagram of the plunger pump of the present invention; Figure 4 For the present invention Figure 3 A partial enlarged view of the M in the middle; Figure 5 It is a structural schematic diagram of the plunger rod of the present invention; Figure 6 It is a schematic diagram of the disassembly of the plunger rod of the present invention.

[0014] Explanation of the reference numerals: 1 first pump body; 2 second pump body; 3 pump head; 4 plunger rod; 401 first plunger section; 402 second plunger section; 403 third plunger section; 404 threaded rod; 405 second elastomer; 406 threaded hole; 5 fastener; 6 first elastomer; 7 sealing pressure ring; 8 first sealing sleeve. DETAILED DESCRIPTION

[0015] 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.

[0016] Embodiment 1 Combination Figure 1 , Figure 2 and Figure 3 As shown, a plug-in pump head 3 assembly for tightening a split plunger rod 4 includes a pump head 3 and a pump body, a plunger rod 4 is provided inside the pump head 3 and the pump body, and the pump body includes a first pump body 1 and a second pump body 2 connected to each other, the first pump body 1 and the second pump body 2 are mutually nested in the axial direction, and a guide structure is provided on the contact surface of the first pump body 1 and the second pump body 2. The first pump body 1 and the second pump body 2 are mutually nested to improve the connection strength of the first pump body 1 and the second pump body 2; the joint of the first pump body 1 and the second pump body 2 is changed, and the usual radial joint of the split pump body is converted into an axial joint to avoid leakage of the medium in the pump body, and the existing plunger pump is usually subjected to abnormal loads and impacts in the radial direction. Through the above-mentioned arrangement, the ability of the pump body to withstand abnormal impacts and vibrations can be improved; secondly, it is conducive to assembling a large structure or a heavy weight pump head 3.

[0017] like Figure 3 As shown, a first elastic body 6 is provided between the first pump body 1 and the second pump body 2, one end of the first elastic body 6 abuts against the first pump body 1, and the other end of the first elastic body 6 abuts against the second pump body 2. Since the first pump body 1 and the second pump body 2 are nested with each other, the first pump body 1 and the second pump body 2 squeeze the first elastic body 6 during the assembly process, and then are fixed by the fastener 5, the first elastic body 6 can reduce the axial impact force of the first pump body 1 and the second pump body 2 during assembly, and avoid damage to the power mechanism of the plunger pump; during the disassembly process, due to the presence of lubricating medium in the plunger pump, the mutual nesting of the first pump body 1 or the second pump body 2 is not conducive to clamping and exiting, and the first pump body 1 or the second pump body 2 can be quickly ejected through the first elastic body 6, which is conducive to the rapid disassembly of the first pump body 1 or the second pump body 2. Secondly, when the first pump body 1 is connected to a heavy weight or large structure pump head 3, the first elastic body 6 can assist in pushing out the first pump body 1, reducing the thrust required for disassembly and reducing labor intensity.

[0018] like Figure 1 and Figure 2 As shown, the plug-in pump head 3 assembly for tightening the split plunger rod 4 also includes a fastener 5, which extends in the radial direction of the pump body, and connects the first pump body 1 and the second pump body 2. Since the first pump body 1 and the second pump body 2 are connected in a nested manner, the joint between the first pump body 1 and the second pump body 2 is a polygon around the axis of the pump body, and the radial fastener 5 is used to avoid relative movement of the first pump body 1 and the second pump body 2 along the axial direction, and improve the ability of the pump body to bear axial loads or impacts.

[0019] like Figure 2As shown, the guide structure includes a first pump body 1 having a polygonal cross section along the radial direction, and a matching polygonal cavity is provided in the second pump body 2. The polygon has multiple edges, which have a guiding function, which is conducive to the nesting of the first pump body 1 and the second pump body 2. At the same time, it can avoid the relative rotation of the first pump body 1 and the second pump body 2 during the installation process, which is conducive to the rapid positioning of the connection hole of the fastener 5.

[0020] like Figure 5 and Figure 6 As shown, the plunger rod 4 includes a first plunger section 401 and a second plunger section 402, which are threadedly connected, and both of which are located inside the pump body for movement. The plunger rod 4 also includes a third plunger section 403, which is a rotating body, and is surrounded by a high-pressure sealing structure. One end of the third plunger section 403 is located inside the pump head 3 for movement, and the other end of the third plunger section 403 is located inside the pump body for movement. The first plunger section 401 is connected to the power mechanism of the plunger pump, and the third plunger section 403 is close to the pump head 3. The third plunger section 403 can be made and processed with materials that are compatible with the fluid conveyed by the plunger pump to ensure the service life of the plunger rod 4. The threaded connection is a rigid connection, which can withstand the axial loads during the reciprocating motion of the plunger rod 4, and the axial relative positions of the various rod components of the split plunger rod 4 will not be displaced, which can ensure that the stroke of the plunger rod 4 does not change, maintain the plunger pump with reliable volumetric efficiency and avoid abnormal axial vibration or impact; during the assembly and disassembly process, the third plunger segment 403 and the second plunger segment 402 are relatively fixed, so they also need to be rotated. The third plunger segment 403 is made into a rotating body, which can ensure that the sealing performance between the plunger rod 4 and the pump head 3 does not change during the assembly and disassembly process.

[0021] like Figure 6 As shown, the threaded connection includes a threaded hole 406 and a threaded rod 404. A second elastic body 405 is provided inside the threaded hole 406. One end of the second elastic body 405 abuts against the bottom of the threaded hole 406, and the other end of the second elastic body 405 abuts against the end of the threaded rod 404. The second elastic body 405 is used to compress the thread between the threaded rod 404 and the threaded hole 406, thereby reducing the wear of the threaded hole 406 caused by the axial movement of the threaded rod 404; the second elastic body 405 can absorb the axial impact transmitted from the second plunger section 402 to the first plunger section 401, and the first elastic body can absorb the axial impact transmitted from the pump head 3 to the second pump body 2, thereby preventing the plunger rod 4 from damaging the power mechanism of the plunger pump due to the axial impact during the reciprocating motion.

[0022] Combination Figure 3 and Figure 4As shown, the pump head 3 is connected to the first pump body 1, and a sealing groove is provided on the connection surface between the pump head 3 and the pump body, and a high-pressure sealing structure is provided in the sealing groove. The high-pressure sealing structure includes a first sealing sleeve 8 and a sealing pressure ring 7, one end of the first sealing sleeve 8 abuts against the first pump body 1, and the other end of the sealing pressure ring 7 abuts against the pump head 3, and the third plunger section 403 is covered with the first sealing sleeve 8.

[0023] There is a joint between the pump head 3 and the first pump body 1. One end of the third plunger segment 403 is located in the internal movement of the pump head 3, and the other end of the third plunger segment 403 is located in the internal movement of the pump body, which is easy to bring out liquid. A high-pressure sealing structure is set to ensure the sealing between the pump head 3 and the first pump body 1, and the high-pressure sealing structure cooperates with the third plunger segment 403 to reduce the wear of the joint between the pump head 3 and the first pump body 1 during the reciprocating movement of the third plunger segment 403. The first sealing sleeve 8 is in direct contact with the third plunger segment 403 to reduce the wear of the third plunger segment 403 during the reciprocating movement; the sealing pressure ring 7 is used to abut against the pump head 3. When the pump head 3 squeezes the sealing pressure ring 7, the first sealing sleeve 8 is squeezed, so that the first sealing sleeve 8 and the third plunger segment 403 are squeezed and contacted with each other, thereby improving the sealing effect of the high-pressure sealing structure.

[0024] The high-pressure sealing structure also includes a second sealing sleeve. A groove is provided on the side of the first sealing sleeve 8 close to the sealing pressure ring 7 . The sealing pressure ring 7 squeezes and fixes the second sealing sleeve in the groove of the first sealing sleeve 8 .

[0025] As shown in the figure, the second sealing sleeve has an annular cavity, the annular cavity is provided with a sealing ring, the side of the second sealing sleeve that cooperates with the plunger rod is provided with a first tooth pattern, and the side of the second sealing sleeve that cooperates with the sealing pressure ring 7 is provided with a second tooth pattern.

[0026] Through the above-mentioned arrangement, the second sealing sleeve is in contact with the plunger rod, and cooperates with the first sealing sleeve 8 to further improve the sealing performance of the high-pressure sealing structure; the second sealing sleeve is used to fix the sealing ring to prevent the reciprocating motion of the plunger rod from causing the sealing ring to move on the surface of the plunger rod; since the second sealing sleeve is clamped and fixed by the sealing pressure ring 7 and the first sealing sleeve 8, the sealing performance of the matching surface between the second sealing sleeve and the plunger rod depends on the machining accuracy of the radial dimension of the second sealing sleeve, and the first tooth pattern is used to form a liquid storage space, which can block the liquid from flowing out along the surface of the plunger rod, improve the sealing performance between the second sealing sleeve and the plunger rod, and reduce the machining accuracy of the radial dimension of the second sealing sleeve; since the second sealing sleeve is clamped and fixed by the sealing pressure ring 7 and the first sealing sleeve 8, the second sealing sleeve is squeezed by the sealing pressure ring 7, and the second tooth pattern is set on the matching surface of the second sealing sleeve and the sealing pressure ring 7, which is conducive to the expansion of the second sealing sleeve and prevents the second sealing sleeve from being damaged and failed due to excessive preload force of the fastener.

[0027] The present invention provides a plug-in pump head 3 assembly for tightening a split plunger rod 4, so that the pump head 3 and the matching plunger rod 4 become replaceable parts, simplifying the assembly steps, reducing the time cost of disinfection and cleaning, and improving the sealing of the split pump body to avoid leakage of the medium in the plunger pump; improving the ability of the split pump body to bear radial loads, and being able to assemble a large-weight and large-structure pump head 3; improving the ability of the pump body to withstand abnormal impacts and vibrations, and improving the structural strength of the split pump body, and has the following beneficial effects: the first pump body 1 and the second pump body 2 are nested with each other, thereby improving the connection strength of the first pump body 1 and the second pump body 2; changing the joint of the first pump body 1 and the second pump body 2, and converting the usual radial joint of the split pump body into an axial joint, thereby avoiding leakage of the medium in the pump body, and the existing plunger pump is usually subjected to abnormal loads and impacts in the radial direction. Through the above-mentioned arrangement, the ability of the pump body to withstand abnormal impacts and vibrations can be improved; secondly, it is conducive to assembling a large-structure or large-weight pump head 3.

[0028] 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 plug-in pump head assembly for tightening a split plunger rod, comprising a pump head (3) and a pump body, wherein the pump head (3) and the pump body are provided with a plunger rod (4), characterized in that: The pump body comprises a first pump body (1) and a second pump body (2) which are connected to each other. The first pump body (1) and the second pump body (2) are mutually nested in the axial direction. The contact surfaces of the first pump body (1) and the second pump body (2) are provided with a guide structure.

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

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

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

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

6. A plug-in pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: The threaded connection comprises a threaded hole (406) and a threaded rod (404); a second elastic body (405) is provided inside the threaded hole (406); one end of the second elastic body (405) abuts against the bottom of the threaded hole (406); and the other end of the second elastic body (405) abuts against the end of the threaded rod (404).

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

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

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