Spinning buckle type pump head assembly for screwing split plunger rod

Abstract

The invention discloses a spinning type pump head assembly for screwing a split plunger rod, which is used for transporting media, and belongs to the technical field of plunger pumps, the spinning type pump head assembly comprises a pump head and a plunger rod arranged in the pump head, one end of the plunger rod far away from the pump head is connected with a plunger rod seat, one end of the plunger rod seat axially extends outwards to form a first column body, and the first column body is connected with a second column body. A threaded column is fixedly arranged in the middle section of the first column body, the diameter of the threaded column is larger than that of the first column body, and the end of the first column body is sleeved with a pre-tightening spring. 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 screw-on pump head assembly for tightening a split plunger rod. Background Art

[0002] The core components of the plunger pump include the cylinder body and the plunger. The cylinder body is usually made of high-strength alloy steel to withstand high pressure, and the plunger is made of wear-resistant materials to ensure wear resistance under high pressure and high speed operation. The change in working volume determines the flow and pressure of the plunger pump, and the working principle of the plunger pump is based on the reciprocating motion of the plunger in the cylinder body to achieve oil suction and discharge. The plunger pump technology uses modular design so that each module can be quickly replaced to adapt to power sources of different specifications. However, most existing plunger pumps have problems such as complex structure, high cost, and inconvenient maintenance.

[0003] Application No. WOCN21086361 discloses an emulsion plunger pump and a pump head assembly thereof, the pump head assembly comprising: a pump head body, a suction valve assembly, a discharge valve assembly, a spacer assembly and an end cover, the pump head body having a hollow chamber; the suction valve assembly, the spacer assembly and the discharge valve assembly are sequentially installed in the hollow chamber; the suction valve assembly comprises a suction valve seat, a suction valve core and a first return spring; the suction valve core is slidably connected to the spacer assembly, the first return spring is located between the spacer assembly and the suction valve core; the end cover is detachably connected to one end of the pump head body. The internal structure of the pump head assembly is reasonable and the service life is long, and 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 for the convenience of understanding by 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 screw-on pump head assembly for tightening a split plunger rod for transporting a medium. The device can disassemble the plunger rod together with the pump head, effectively solving the problem of difficulty in maintaining 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 screw-on pump head assembly for tightening a split plunger rod comprises a pump head and a plunger rod installed in the pump head, wherein one end of the plunger rod away from the pump head is connected to a plunger rod seat, one end of the plunger rod seat extends axially outwardly with a first column, a threaded column is fixedly provided at the middle position of the first column, the diameter of the threaded column is greater than the diameter of the first column, and a preload spring is sleeved on the end of the first column.

[0007] According to one embodiment of the present invention, a plunger is connected to one end of the plunger rod seat, and a threaded mounting hole is axially inwardly provided at one end of the plunger connected to the plunger rod seat, and a threaded groove matching the threaded column is provided on the side wall of the threaded mounting hole. A distance is provided between the end of the first column and the bottom of the threaded mounting hole. The diameter of the preload spring is smaller than the diameter of the threaded column, the preload spring is coaxial with the plunger rod seat, and a strip groove is provided in an array on the side of the plunger rod seat.

[0008] 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 welding, threading, heat fitting, bonding, etc. The preload spring is fixed to the end of the first column and is stuck on the outside of the threaded column. During installation, the threaded column is screwed into the threaded mounting hole. Since there is a distance between the bottom of the threaded mounting hole and the end of the first column, the distance provides compression space for the preload spring. Therefore, after the threaded column is fully installed, the preload spring is in a compressed state, and a force opposite to the installation direction of the threaded column is generated, so that the threaded column and the threaded mounting hole are tightly combined, which can prevent grease from entering the connecting part of the threaded mounting hole and the threaded column during the operation of the plunger pump, thereby causing the plunger rod and the plunger rod seat to loosen and rotate. At the same time, the first column part located between the plunger rod seat and the threaded column is an annular groove, which is a cavity structure after installation. In this way, even if a trace amount of grease enters the threaded mounting hole from the gap between the plunger rod seat and the plunger when the plunger pump is running, it will be accumulated in the annular groove instead of directly entering the threaded column.

[0009] According to one embodiment of the present invention, a first pump body is provided on one side of the pump head, a second pump body is provided on one side of the first pump body, the first pump body and the second pump body are connected by a screw thread, and a screw hole is provided on the side of the screw. The first pump body and the second pump body are provided with a through hole that cooperates with the plunger rod, and the through hole is coaxial with the plunger rod seat. A peephole is provided on the side of the first pump body, and the axis of the peephole is perpendicular to the axis of the plunger rod. A threaded groove is provided on the inner side of the screw, and a threaded protrusion that cooperates with the threaded groove is provided around the side of the first pump body and the second pump body. A pump body is provided between the first pump body and the pump head, the pump head is threadedly connected to the pump body, and the pump body is threadedly connected to the first pump body. A tensioning screw is provided on the side array of the screw, and the tensioning screw is coaxial with the screw hole.

[0010] The first pump body and the second pump body are mutually interlocking column sleeve bodies. The contact end of the first pump body and the second pump body has two oppositely arranged square protrusions extending axially outward. The second pump body is provided with a groove that matches the square protrusion. When installing, the first pump body and the second pump body are mutually interlocked, and the square protrusion is installed in the groove, so that the first pump body cannot rotate relative to the second pump body, and the protrusion can be used as an installation positioning component to avoid installation misalignment. The power mechanism pushes the plunger rod, thereby pushing the plunger, so that the plunger moves in one direction, resulting in negative pressure in the working chamber. The working chamber is provided with oil pipes in the direction of both ends of the pump head. The oil pipes are connected to the outside world, so that the liquid is sucked into the cylinder; when the plunger ends a stroke and moves in another direction, the liquid is compressed, and the liquid sucked into the cylinder is discharged, and the plunger continuously reciprocates to achieve continuous oil supply.

[0011] When installing the first pump body and the second pump body, first screw the buckle into the threaded structure on the first pump body and the second pump body to connect the first pump body and the second pump body together. Since the buckle is provided with a groove that matches the threaded structure on the first pump body and the second pump body, the inner wall of the groove and the threaded protrusions on the two pump bodies are in friction contact with each other, and the tensioning screw passes through the side wall of the buckle and is connected with the internal groove. After tightening the tensioning screw, the screw rod will press against the threaded protrusion that contacts the corresponding inner wall of the buckle groove. Continuously tightening the tensioning screw will increase the gap between the threaded protrusion on the second pump body and the contact surface of the buckle, thereby increasing the friction between the buckle and the two pump bodies, thereby achieving a tightening effect and avoiding the problem that the threaded connection of the two pump bodies may be unstable using a single method of using a buckle. In detail, in the fixing method of a single turnbuckle, the gap between the connection parts of the first pump body, the second pump body and the turnbuckle is large, and the connection cannot be tightened. When the equipment is running, the vibration of the equipment will cause the turnbuckle to loosen. In addition, due to the gap between its components, when the equipment is running, the first pump body and the second pump body will frequently and slightly collide with each other with the turnbuckle, resulting in equipment noise, increased wear and grease leakage at the connection part between the first pump body and the second pump body, and serious impact on the life and safety of the equipment. The use of tensioning screws will increase the gap between the threaded protrusion on the second pump body and the contact surface of the turnbuckle, thereby tightly connecting the first pump body and the second pump body. At the same time, the tensioning screws arranged in an array around the axis of the two pump bodies can tighten the first pump body and the second pump body together from multiple angles.

[0012] Since the plunger moves axially in the pump chamber, after removing the tensioning screw, unscrew the buckle, pull the pump head axially outward, and separate the first pump body from the second pump body. In this way, the pump chamber can be cleaned and maintained without removing the pump head and the plunger rod. The connection and working status of the plunger rod can be observed through the peephole to determine whether the pump chamber and the plunger rod need to be cleaned and maintained. At the same time, the peephole also has the effect of balancing the pressure inside and outside the pump chamber and dissipating heat and cooling. In addition, in the shutdown state, the plunger rod can also be cleaned and maintained directly through the peephole using tools such as an oil spray head, and then the cleaning oil that drips to the bottom of the pump chamber when cleaning the plunger rod can be sucked out through the peephole, which can also complete simple cleaning and maintenance of the plunger rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects: It can prevent grease from entering the connection part between the threaded mounting hole and the threaded column during the operation of the plunger pump, thereby causing the plunger rod and the plunger rod seat to loosen and rotate. An annular groove is provided at one end of the first rod body close to the plunger rod seat, so that even if a small amount of grease enters the threaded mounting hole from the gap between the plunger rod seat and the plunger when the plunger pump is running, it will be stored in the annular groove and will not directly enter the threaded column. The use of tensioning screws can prevent the loosening of the turnbuckle due to equipment vibration on the one hand, and prevent friction, collision and noise between the first pump body and the second pump body on the other hand. At the same time, the tensioning screws arranged in an array can fasten the two pump bodies together from multiple angles. The design of the turnbuckle can realize the cleaning and maintenance of the inside of the pump chamber and the plunger rod and other components without disassembling the pump head and the plunger rod, and simple maintenance of the plunger rod and the like can also be performed through the peephole. 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 It is a schematic diagram of a screw-on pump head assembly for tightening a split plunger rod according to the present invention; Figure 2 It is a cross-sectional schematic diagram of a screw-on pump head assembly for tightening a split plunger rod according to the present invention; Figure 3 It is a cross-sectional schematic diagram of the cooperation between the plunger rod and the pump head of the present invention; Figure 4 This is a schematic diagram of the plunger rod installation scheme of the present invention; Figure 5 This is a schematic cross-sectional view of the plunger rod of the present invention; Figure 6 It is a schematic diagram of the plunger rod solution of the present invention.

[0016] Figure numbers: 10-pump body; 101-first pump body; 102-second pump body; 103-peephole; 20-turn buckle; 201-tensioning screw; 30-pump head; 301-seal; 302-working chamber; 401-plunger rod; 402-plunger; 403-plunger rod seat; 404-preload spring; 405-threaded column; 406-threaded mounting 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 6 As shown, a screw-on pump head assembly for tightening a split plunger rod includes a pump head 30 and a plunger rod 401 installed in the pump head 30, the plunger rod 401 is connected to a plunger rod seat 403 at one end away from the pump head 30, a first column is axially extended outward from one end of the plunger rod seat 403, a threaded column 405 is fixedly provided in the middle section of the first column, the diameter of the threaded column 405 is larger than the diameter of the first column, and a preload spring 404 is sleeved on the end of the first column.

[0020] One end of the plunger rod seat 403 is connected to the plunger 402, and one end of the plunger 402 connected to the plunger rod seat 403 is provided with a threaded mounting hole 406 axially inwardly, and the side wall of the threaded mounting hole 406 is provided with a threaded groove that matches the threaded column 405. A distance is set between the end of the first column and the bottom of the threaded mounting hole 406. The diameter of the preload spring 404 is smaller than the diameter of the threaded column 405, the preload spring 404 is coaxial with the plunger rod seat 403, and a strip groove is arranged in an array on the side of the plunger rod seat 403.

[0021] The plunger rod 401 is fixedly connected to the plunger rod seat 403. The fixing methods of the plunger rod 401 and the plunger rod seat 403 include but are not limited to welding, threading, heat fitting, bonding, etc. The preload spring 404 is fixed to the end of the first column and is stuck on the outside of the threaded column 405. During installation, the threaded column 405 is screwed into the threaded mounting hole 406. Since there is a distance between the bottom of the threaded mounting hole 406 and the end of the first column, the distance provides compression space for the preload spring 404. Therefore, after the threaded column 405 is fully installed, the preload spring 404 is in a compressed state, which will generate a force opposite to the installation direction of the threaded column 405, so that the threaded column 405 05 is tightly combined with the threaded mounting hole 406, which can prevent grease from entering the connection part between the threaded mounting hole 406 and the threaded column 405 during the operation of the plunger pump, thereby causing the plunger rod 401 and the plunger rod seat 403 to loosen and rotate. At the same time, the first column part located between the plunger rod seat 403 and the threaded column 405 is an annular groove, which is a cavity structure after installation. In this way, even if a small amount of grease enters the threaded mounting hole 406 from the gap between the plunger rod seat 403 and the plunger 402 when the plunger pump is running, it will be accumulated in the annular groove instead of directly entering the threaded column 405.

[0022] A first pump body 101 is provided on one side of the pump head 30, and a second pump body 102 is provided on one side of the first pump body 101. The first pump body 101 and the second pump body 102 are threadedly connected through a turnbuckle 20, and a screw hole is provided on the side of the turnbuckle 20. A through hole matching the plunger rod 401 is provided on the first pump body 101 and the second pump body 102, and the through hole is coaxial with the plunger rod seat 403. A peephole 103 is provided on the side of the first pump body 101, and the axis of the peephole 103 is perpendicular to the axis of the plunger rod 401. A threaded groove is provided on the inner side of the turnbuckle 20, and a threaded protrusion matching the threaded groove is provided around the side of the first pump body 101 and the second pump body 102. A pump body 10 is provided between the first pump body 101 and the pump head 30, and the pump head 30 is threadedly connected to the pump body 10, and the pump body 10 is threadedly connected to the first pump body 101. A tensioning screw 201 is provided on the side of the turnbuckle 20, and the tensioning screw 201 is coaxial with the screw hole.

[0023] The first pump body 101 and the second pump body 102 are mutually interlocking column sleeves. The first pump body 101 and the second pump body 102 contact one end and extend axially outward with two oppositely arranged square protrusions. The second pump body 102 is provided with a groove that matches the square protrusion. When installing, the first pump body 101 and the second pump body 102 are mutually interlocked, and the square protrusion is installed in the groove, so that the first pump body 101 cannot rotate relative to the second pump body 102, and the protrusion can be used as an installation positioning component to avoid the occurrence of installation misalignment. The power mechanism pushes the plunger rod 401, thereby pushing the plunger 402, so that the plunger 402 moves in one direction, resulting in negative pressure in the working chamber 302. The working chamber 302 is provided with oil pipes in the direction of both ends of the pump head 30, and the oil pipes are connected to the outside world, so that the liquid is sucked into the cylinder; when the plunger 402 ends a stroke and moves in another direction, the liquid is compressed, and the liquid sucked into the cylinder is discharged, and the plunger 402 continuously reciprocates, thereby realizing continuous oil supply.

[0024] When installing the first pump body 101 and the second pump body 102, first screw the buckle 20 into the threaded structure on the first pump body 101 and the second pump body 102 to connect the first pump body 101 and the second pump body 102 together. Since the buckle 20 is provided with a groove that matches the threaded structure on the first pump body 101 and the second pump body 102, the inner wall of the groove and the threaded protrusions on the two pump bodies are in friction contact with each other, and the tensioning screw 201 passes through the side wall of the buckle 20 and is connected with the internal groove. After tightening the tensioning screw 201, the screw rod will press against the threaded protrusion corresponding to the inner wall of the groove of the buckle 20. Continuously tightening the tensioning screw 201 will increase the gap between the threaded protrusion on the second pump body and the contact surface of the buckle 20, thereby increasing the friction between the buckle 20 and the two pump bodies, thereby achieving a tightening effect and avoiding the problem that the threaded connection of the two pump bodies may not be firm using a single method of using the buckle 20. In detail, in the fixing method of a single turn button 20, the gap between the connection parts of the first pump body 101, the second pump body 102 and the turn button 20 is large, and the connection cannot be tightened. When the equipment is running, the vibration of the equipment will cause the fixation of the turn button 20 to loosen. In addition, due to the gap between its components, when the equipment is running, the first pump body 101 and the second pump body 102 will frequently and slightly collide with the turn button 20, resulting in equipment noise and increased wear and grease leakage at the connection part between the first pump body 101 and the second pump body 102, which seriously affects the life and safety of the equipment. The use of the tensioning screw 201 will increase the gap between the threaded protrusion on the second pump body and the contact surface of the turn button 20, thereby tightly connecting the first pump body 101 and the second pump body 102. At the same time, the tensioning screws 201 arranged in an array around the axis of the two pump bodies can tighten the first pump body 101 and the second pump body 102 together from multiple angles.

[0025] Since the plunger moves axially in the pump chamber, after removing the tensioning screw 201, the turnbuckle 20 is screwed out, and the pump head 30 is pulled axially outward to separate the first pump body 101 from the second pump body 102, so that the cleaning and maintenance of the pump chamber can be completed without disassembling the pump head 30 and the plunger rod 401. The connection and working state of the plunger rod 401 can be observed through the peephole 103, so as to determine whether it is necessary to clean and maintain the pump chamber and the plunger rod 401, and the peephole also has the effect of balancing the pressure inside and outside the pump chamber and dissipating heat and cooling. In addition, in the shutdown state, the plunger rod 401 can also be cleaned and maintained directly through the peephole 103 using tools such as an oil spray head, and then the cleaning oil dripping to the bottom of the pump chamber when cleaning the plunger rod 401 can be sucked out through the peephole 103, and the simple cleaning and maintenance of the plunger rod 401 can also be completed.

[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 401, the plunger rod seat 403 and the plunger 402 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 for installation and use 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 screw-on pump head assembly for tightening a split plunger rod, comprising a pump head (30) and a plunger rod (401) installed in the pump head (30), Features: One end of the plunger rod (401) away from the pump head (30) is connected to a plunger rod seat (403); one end of the plunger rod seat (403) has a first column extending axially outward; a threaded column (405) is fixedly provided at the middle of the first column; the diameter of the threaded column (405) is greater than the diameter of the first column; and a preload spring (404) is sleeved on the end of the first column.

2. A screw-on pump head assembly for tightening a split plunger rod according to claim 1, characterized in that: One end of the plunger rod seat (403) is connected to a plunger (402), and one end of the plunger (402) connected to the plunger rod seat (403) is provided with a threaded mounting hole (406) axially inwardly, and a side wall of the threaded mounting hole (406) is provided with a threaded groove that cooperates with the threaded column (405).

3. A screw-on pump head assembly for tightening a split plunger rod according to claim 2, characterized in that: There is a distance between the end of the first column and the bottom of the threaded mounting hole (406).

4. A screw-on pump head assembly for tightening a split plunger rod according to claim 2, characterized in that: The diameter of the preload spring (404) is smaller than the diameter of the threaded column (405); the preload spring (404) is coaxial with the plunger rod seat (403); and a strip-shaped groove is arranged in an array on the side surface of the plunger rod seat (403).

5. The screw-on pump head assembly for tightening the split plunger rod according to claim 1, characterized in that: A first pump body (101) is provided on one side of the pump head (30), and a second pump body (102) is provided on one side of the first pump body (101). The first pump body (101) and the second pump body (102) are threadedly connected via a turnbuckle (20), and a screw hole is provided on a side surface of the turnbuckle (20).

6. A screw-on pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: The first pump body (101) and the second pump body (102) are provided with a through hole that cooperates with the plunger rod (401), and the through hole is coaxial with the plunger rod seat (403).

7. A screw-on pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: A peephole (103) is provided on the side of the first pump body (101), and the axis of the peephole (103) is perpendicular to the axis of the plunger rod (401).

8. A screw-on pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: The inner side of the turn buckle (20) is provided with a thread groove, and the side surfaces of the first pump body (101) and the second pump body (102) are surrounded by thread protrusions that cooperate with the thread groove.

9. A screw-on pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: A pump body (10) is provided between the first pump body (101) and the pump head (30); the pump head (30) is threadedly connected to the pump body (10); and the pump body (10) is threadedly connected to the first pump body (101).

10. A screw-on pump head assembly for tightening a split plunger rod according to claim 5, characterized in that: The side array of the turn button (20) is provided with tensioning screws (201), and the tensioning screws (201) are coaxial with the screw holes.

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