Plug-in pump head assembly of butt joint type segmented plunger rod

Abstract

The invention discloses an inserting pump head assembly of a butt joint type segmented plunger rod, which is used for conveying media, and belongs to the technical field of plunger pumps, the device comprises a plunger pump head and a plunger rod arranged in the pump head, one end, far away from the pump head, of the plunger rod is connected with a plunger rod seat, the plunger rod seat is a cylinder, one end of the cylinder axially extends outwards to form a circular ring body, and the other end of the cylinder is connected with the plunger rod seat. The plunger rod is installed in the circular ring body, the other end of the column body is connected with a plunger, and an installation base hole is axially and inwards formed in the end, connected with the column body, of the plunger. According to the device, the plunger rod can be integrally detached along with the pump head, and the problem that the pump head is difficult to maintain due to the fact that the plunger rod is fixedly connected with the plunger is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps, and in particular relates to a plug-in pump head assembly of a docking-type segmented plunger rod. Background Art

[0002] A plunger pump is a machine that uses the reciprocating motion of a plunger in a pump cylinder to move fluid. Its core involves fluid mechanics and mechanical engineering. The principle of a plunger pump is that the plunger reciprocates in the pump cylinder to inhale and discharge fluid through changes in the sealed volume. This pump has high pressure, high efficiency and good self-priming ability, and is widely used in hydraulic systems, petrochemicals, water treatment and other fields. However, at present, the plunger pump is difficult to disassemble and repair because the plunger and the plunger rod are mostly connected in one piece. In addition, since the plunger rod cannot be replaced, the flow rate of the plunger pump is fixed and the purpose is single. The same plunger pump cannot be used under multiple flow requirements, which increases the cost.

[0003] Application No. US5403169A discloses a plunger pump, in which there is a pump chamber defined by a cylinder and a plunger reciprocating in the cylinder, and a first sealing member arranged between the inner surface of the cylinder and the outer surface of the plunger to prevent the liquid in the pump chamber from leaking to the outside, the inner surface of the cylinder and the outer surface of the plunger are not in sliding contact with each other, and a second sealing member is inserted between the first sealing member and the pump chamber. During the suction stroke, the second sealing member is in sliding contact with the outer surface of the plunger to prevent dust generated by wear from flowing from the first sealing member side to the pump chamber. During the discharge stroke, a small gap is formed between the second sealing member and the outer surface of the plunger. The first discharge system is arranged between the second sealing member and the first sealing member, and is used to discharge any liquid flowing from the pump chamber through the second sealing member to the outside. Thereby preventing the pump liquid from being contaminated by dust, the patent still has room for improvement.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a plug-in pump head assembly with a docking-type segmented plunger rod, which can disassemble the plunger rod together with the pump head, effectively solving the problem of difficult maintenance of the pump head due to the fixed connection between the plunger rod and the plunger.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A plug-in pump head assembly with a docking-type segmented plunger rod comprises a plunger pump head and a plunger rod arranged in the pump head. The end of the plunger rod away from the pump head is connected to a plunger rod seat. The plunger rod seat is a column. A circular ring body extends axially outward from one end of the column. The plunger rod is installed in the circular ring body. A plunger is connected to the other end of the column. A mounting base hole is axially inwardly provided at one end of the plunger connected to the column.

[0007] According to one embodiment of the present invention, the mounting base hole is a cylindrical groove, two square notches are arranged on the side wall of the cylindrical groove, and a pin hole is arranged on the outer side of the cylindrical groove, and the pin hole is a through hole structure. A rod body is axially extended outward from one end of the plunger rod seat connected to the plunger, and a rectangular block protrudes radially outward from the rod body, and the size of the rectangular block is the same as the size of the square notch. A concave hole is arranged on the side wall of the rod body, and the concave hole is coaxial with the pin hole, and a shoulder screw is arranged on the pin hole. The length of the mounting base hole is greater than the length of the rod body, and the maximum diameter of the plunger rod seat is the same as the diameter of the plunger.

[0008] First, the plunger rod is fixedly connected to the plunger rod seat. The fixing methods of the plunger rod and the plunger rod seat include but are not limited to heat fitting, bonding, welding, threading, etc. During installation, the rod body extending from the end of the plunger rod seat is plugged into the mounting base hole, and then the shoulder screw is screwed into the concave hole on the side wall of the rod body on one side of the middle plunger rod seat through the pin hole to fix the plunger rod and the plunger together. The square notch in the mounting base hole is installed in conjunction with the protruding rectangular block of the plunger rod seat, so that the plunger cannot rotate relative to the plunger rod. The plunger is axially translated relative to the plunger when working, and the rotation of the plunger in the pump chamber will cause the plunger to be subjected to a force perpendicular to the axial translation. The intersection of these two forces will accelerate the wear of the plunger and reduce the service life of the plunger. Therefore, it is necessary to avoid the rotation of the plunger. This structure prevents the plunger and the plunger rod from relative movement and rotation from two angles, that is, avoiding axial translation and axial rotation of the relative position, thereby avoiding the disconnection of the plunger and the plunger rod and the rotation of the plunger.

[0009] According to one embodiment of the present invention, the pump head is threadedly connected to the pump body, and the pump body is provided with a through hole for mounting with the plunger rod. The pump body is sleeved on the outside of the pump body, and the pump body is provided with a through hole for mounting with the plunger. Through holes are provided on both sides of the pump body, and fastening bolts are provided on the through holes on both sides of the pump body, and a hole groove coaxial with the fastening bolts is provided on the side wall of the pump body. A return spring is provided between the pump body and the pump body, and the return spring is fixedly connected to the bottom of the pump body. A peephole is provided on the side wall of the pump body, and the peephole is perpendicular to the plunger. The return spring is coaxial with the plunger, and the return spring is sleeved on the outside of the plunger.

[0010] The power mechanism pushes the plunger rod, thereby pushing the plunger, causing the plunger to move in one direction, resulting in negative pressure in the working chamber. Oil pipes are provided in the direction from the working chamber to both ends of the pump head, so that the liquid is sucked into the cylinder; when the plunger finishes one stroke and moves in the other direction, the liquid is compressed and the liquid sucked into the cylinder is discharged. Since the plunger performs reciprocating motion, continuous oil supply can be achieved.

[0011] A peephole is provided on the side wall of the pump body, and the peephole is a through hole. The plunger rod structure can be directly seen through the peephole, and the connection status and working status of the plunger rod, as well as the status of the lubricating oil, can be observed in real time to determine the time for replacement and maintenance of the plunger rod. The shoulder screw can be directly removed using a tool through the through hole structure, so that the plunger rod can be removed first without removing the pump head, thereby avoiding dangerous situations that may be caused by the connection status of the plunger rod and the plunger when the connection structure between the pump head and the pump body is opened after the pump head is removed, such as sudden power-on and startup of the equipment, or changes in the balance state of the pump body, such as slippage or rolling, which causes the pump head to undergo the same change in balance state through the connection structure of the plunger rod. During the operation of the plunger pump, a large amount of heat will be generated due to the friction between the components. This heat can be discharged through the peephole and the through holes on the pump body and pump head structure, which has the effect of heat dissipation and cooling. Due to thermal expansion and contraction, the heat will increase the gas pressure in the chamber, and the pressurized gas will be discharged synchronously through the peephole, so that it also has the function of pressure relief. At the same time, the waste grease on the plunger rod can also flow out of the peephole, prompting personnel for maintenance. When there is oil leakage in the pump chamber, personnel can also know the leaked oil through the peephole in time, and check and repair it.

[0012] The peephole has a certain effect of absorbing resonance and sound inside and outside the pump cavity. The specific principle is: the through hole can change the resonance characteristics of the chamber: the resonance frequency of the chamber is determined by its volume and shape. Adding a through hole will change the volume of the chamber and the transmission path of the internal sound part, thereby affecting its resonance frequency, and the size and position of the through hole will affect the reflection and absorption of sound waves in the chamber, thereby changing the resonance characteristics. By adjusting the aperture size and distribution, sounds of different frequency bands can be absorbed. Small holes absorb more high-frequency noise because high-frequency sound waves have a shorter wavelength and are more likely to enter the small hole and be absorbed, while large holes absorb more low-frequency noise, mainly because low-frequency sound waves have a longer wavelength and are more likely to bypass the hole and enter the chamber directly. Therefore, according to the range of sound frequencies in the pump cavity of different plunger pumps, the size and position of the through hole can be reasonably designed to effectively absorb resonance and sound.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This structure prevents the plunger and the plunger rod from relative movement and rotation from two angles, that is, axial translation and axial rotation of the relative position. The plunger rod structure can be directly seen through the peephole, and the connection status and working status of the plunger rod can be observed in real time. The plunger rod can be removed without removing the pump head, avoiding the same change in the equilibrium state of the pump head caused by the connection structure of the plunger rod when the connection structure between the pump head and the pump body is opened after the pump head is removed. The hot gas generated by the operation of the plunger pump will be discharged through the peephole, which has the effect of pressure relief, heat dissipation and cooling. The peephole has a certain effect of absorbing resonance and sound inside and outside the pump cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0015] Figure 1 This is a schematic diagram of the pump head assembly scheme of the present invention; Figure 2 It is a cross-sectional schematic diagram of the pump head assembly of the present invention; Figure 3 It is a schematic diagram of the pump body structure scheme of the present invention; Figure 4 It is a schematic diagram of the plunger rod scheme of the present invention; Figure 5 This is a schematic diagram of the plunger rod connection method of the present invention; Figure 6 It is a cross-sectional schematic diagram of the plunger rod of the present invention; Figure 7 It is a cross-sectional schematic diagram of the matching scheme of the plunger rod and the pump head of the present invention.

[0016] Figure numbers: 10-pump body; 101-return spring; 102-bolt through hole; 103-peephole; 20-pump body; 201-fastening bolt; 30-pump head; 301-seal; 302-working chamber; 401-plunger; 402-plunger rod; 403-plunger rod seat; 404-shoulder screw; 405-pin hole; 406-mounting base hole. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0018] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0019] Embodiment 1 See attached Figure 1-Figure 7 As shown, a plug-in pump head assembly of a docking-type segmented plunger rod includes a plunger pump head 30 and a plunger rod 402 arranged in the pump head 30, the end of the plunger rod 402 away from the pump head 30 is connected to a plunger rod seat 403, the plunger rod seat 403 is a cylinder, one end of the cylinder has an annular body extending axially outward, the plunger rod 402 is installed in the annular body, the other end of the cylinder is connected to a plunger 401, and the end of the plunger 401 connected to the cylinder is provided with an installation base hole 406 axially inward.

[0020] The mounting base hole 406 is a cylindrical groove, and two square notches are arranged on the side wall of the cylindrical groove opposite to each other, and a pin hole 405 is arranged on the outer side of the cylindrical groove, and the pin hole 405 is a through hole structure. The plunger rod seat 403 is connected to the plunger 401 at one end, and a rod body is extended axially outward, and a rectangular block protrudes radially outward from the rod body, and the size of the rectangular block is the same as the size of the square notch. A concave hole is arranged on the side wall of the rod body, and the concave hole is coaxial with the pin hole 405, and a shoulder screw 404 is arranged on the pin hole 405. The length of the mounting base hole 406 is greater than the length of the rod body, and the maximum diameter of the plunger rod seat 403 is the same as the diameter of the plunger 401.

[0021] First, the plunger rod 402 is fixedly connected to the plunger rod seat 403. The fixing methods of the plunger rod and the plunger rod seat include but are not limited to heat fitting, bonding, welding, threading, etc. During installation, the rod body extending from the end of the plunger rod seat 403 is plugged into the mounting base hole 406, and then the shoulder screw 404 is screwed into the concave hole on the side wall of the rod body on one side of the middle plunger rod seat 403 through the pin hole 405 to fix the plunger rod 402 and the plunger 401 together, wherein the mounting base hole 406 The square notch inside is installed in cooperation with the protruding rectangular block of the plunger rod seat 403, so that the plunger 401 cannot rotate relative to the plunger rod 402. The plunger 401 is axially translated relative to the plunger 401 during operation, and the rotation of the plunger 401 in the pump chamber will cause the plunger 401 to be subjected to a force perpendicular to the axial translation. The intersection of these two forces will accelerate the wear of the plunger 401 and reduce the service life of the plunger 401. Therefore, it is necessary to avoid the rotation of the plunger 401. This structure prevents the plunger 401 and the plunger rod 402 from relative movement and rotation from two angles, that is, avoiding axial translation and axial rotation of the relative position, thereby avoiding the disconnection of the plunger 401 and the plunger rod 402 and the rotation of the plunger 401.

[0022] The pump head 30 is threadedly connected to the pump body 20, and the pump body 20 is provided with a through hole for fitting with the plunger rod 402. The pump body 10 is sleeved on the outside of the pump body 20, and the pump body 10 is provided with a through hole for fitting with the plunger 401. Through holes are provided on both sides of the pump body 10, and fastening bolts 201 are provided on the through holes on both sides of the pump body 10, and a hole groove coaxial with the fastening bolts 201 is provided on the side wall of the pump body 20. A return spring 101 is provided between the pump body 10 and the pump body 20, and the return spring 101 is fixedly connected to the bottom of the pump body 10. A peephole 103 is provided on the side wall of the pump body 10, and the peephole 103 is perpendicular to the plunger 401. The return spring 101 is coaxial with the plunger 401, and the return spring 101 is sleeved on the outside of the plunger 401.

[0023] The power mechanism pushes the plunger rod 402, thereby pushing the plunger 401, causing the plunger 401 to move in one direction, resulting in negative pressure in the working chamber 302. The working chamber 302 is provided with oil pipes in the directions of both ends of the pump head 30, so that the liquid is sucked into the cylinder; when the plunger 401 finishes a stroke and moves in another direction, the liquid is compressed and the liquid sucked into the cylinder is discharged. Since the plunger 401 performs reciprocating motion, continuous oil supply can be achieved.

[0024] A peephole 103 is provided on the side wall of the pump body 10. The peephole 103 is a through hole. The structure of the plunger rod 402 can be directly seen through the peephole 103, and the connection status and working status of the plunger rod 402 and the status of the lubricating oil can be observed in real time to determine the time for replacing and maintaining the plunger rod 402. The shoulder screw 404 can be directly removed using a tool through the through hole structure, so that the plunger rod 402 can be removed first without removing the pump head 30, thereby avoiding dangerous situations that may be caused by the connection status of the plunger rod 402 and the plunger 401 when the connection structure between the pump head 30 and the pump body 20 is opened after the pump head 30 is removed, such as sudden power-on and startup of the equipment, or changes in the balance state of the pump body 10, such as slippage or rolling, which causes the pump head 30 to undergo the same change in balance state through the connection structure of the plunger rod 402. During the operation of the plunger pump, a large amount of heat will be generated due to the friction between the components. The heat can be discharged through the peephole 103 and the through holes on the pump body 20 and the pump body 10 structure, which has the effect of heat dissipation and cooling. Due to thermal expansion and contraction, the heat will increase the gas pressure in the chamber, and the pressurized gas will be discharged synchronously through the peephole 103, so that it also has the function of pressure relief. At the same time, the waste lubricating grease on the plunger rod 402 can also flow out from the peephole 103, prompting personnel for maintenance. When there is oil leakage in the pump chamber, personnel can also know the leaked oil through the peephole 103 in time, and check and repair it.

[0025] The peephole 103 has a certain effect of absorbing resonance and sound inside and outside the pump cavity. The specific principle is: the through hole can change the resonance characteristics of the chamber: the resonance frequency of the chamber is determined by its volume and shape. Adding a through hole will change the volume of the chamber and the transmission path of the internal sound part, thereby affecting its resonance frequency, and the size and position of the through hole will affect the reflection and absorption of sound waves in the chamber, thereby changing the resonance characteristics. By adjusting the aperture size and distribution, sounds of different frequency bands can be absorbed. Small holes absorb more high-frequency noise because the wavelength of high-frequency sound waves is shorter and it is easier to enter the small hole and be absorbed, while large holes absorb more low-frequency noise, mainly because the wavelength of low-frequency sound waves is longer and it is easier to bypass the hole and enter the chamber directly. Therefore, according to the range of sound frequencies in the pump cavity of different plunger pumps, the size and position of the through hole can be reasonably designed to effectively absorb resonance and sound.

[0026] At the same time, it should be noted that in the present embodiment, the number of plunger rod assemblies consisting of the plunger rod 402, the plunger rod seat 403 and the plunger 401 installed in the plunger pump is 1-4 groups, but the present technical solution is not limited to 1-4 groups, for example, it can be 1 group, 2 groups, 3 groups, 4 groups, 5 groups, 6 groups, 7 groups, 8 groups, 9 groups, 10 groups, 11 groups... In actual production work, according to different production needs, different numbers of plunger rod assemblies can be selected to be installed and used in conjunction with the plunger pump.

[0027] The embodiments and / or implementation methods described above 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 or modifications 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. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A plug-in pump head assembly with a docking-type segmented plunger rod, comprising a plunger pump head (30) and a plunger rod (402) disposed in the pump head (30), Features: One end of the plunger rod (402) away from the pump head (30) is connected to a plunger rod seat (403); the plunger rod seat (403) is a column; one end of the column has a circular ring extending axially outward; the plunger rod (402) is mounted in the circular ring; the other end of the column is connected to a plunger (401); and one end of the plunger (401) connected to the column has a mounting base hole (406) axially inwardly provided.

2. The plug-in pump head assembly of a docking-type segmented plunger rod according to claim 1, characterized in that: The mounting base hole (406) is a cylindrical groove, two square notches are arranged opposite to each other on the side wall of the cylindrical groove, and a pin hole (405) is arranged on the outer side of the cylindrical groove.

3. The plug-in pump head assembly of a docking-type segmented plunger rod according to claim 2 is characterized in that: The plunger rod seat (403) is connected to the plunger (401) at one end, and a rod body is axially extended outwards. The rod body has a rectangular block protruding radially outwards, and the size of the rectangular block is the same as the size of the square notch.

4. The plug-in pump head assembly of a docking-type segmented plunger rod according to claim 3 is characterized in that: The side wall of the rod body is provided with a concave hole, the concave hole is coaxial with the pin hole (405), and the pin hole (405) is provided with a shoulder screw (404).

5. The plug-in pump head assembly of a docking-type segmented plunger rod according to claim 1, characterized in that: The pump head (30) is threadedly connected to a pump body (20), and the pump body (20) is provided with a through hole for cooperating with the plunger rod (402).

6. The plug-in pump head assembly of the docking type segmented plunger rod according to claim 5, characterized in that: The pump body (20) is sleeved with a pump body (10) on the outside, and the pump body (10) is provided with a through hole that cooperates with the plunger (401).

7. The plug-in pump head assembly of the docking type segmented plunger rod according to claim 6, characterized in that: Through holes are provided on both sides of the pump body (10), fastening bolts (201) are provided on the through holes on both sides of the pump body (10), and a hole groove coaxial with the fastening bolts (201) is provided on the side wall of the pump body (20).

8. The plug-in pump head assembly of a docking-type segmented plunger rod according to claim 6, characterized in that: A return spring (101) is provided between the pump body (10) and the pump body (20), and the return spring (101) is fixedly connected to the bottom of the pump body (10).

9. The plug-in pump head assembly of a docking-type segmented plunger rod according to claim 6, characterized in that: The side wall of the pump body (10) is provided with a peephole (103), and the peephole (103) is perpendicular to the plunger (401).

10. The plug-in pump head assembly of the docking type segmented plunger rod according to claim 8, characterized in that: The return spring (101) is coaxial with the plunger (401), and the return spring (101) is sleeved on the outside of the plunger (401).

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