Plug-in pump head assembly of clamping groove type segmented plunger rod

Abstract

The invention discloses a plug-in pump head assembly of a clamping groove type segmented plunger rod, which is used for conveying media, and belongs to the technical field of plunger pumps, the plug-in pump head assembly comprises a pump head and a plunger rod in sliding connection with the pump head, a plunger rod clamping seat is arranged at one end, far away from the pump head, of the plunger rod, one end part of the plunger rod clamping seat is connected with a plunger, and the plunger and the plunger rod clamping seat are coaxial. 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 slot-type segmented plunger rod. Background Art

[0002] The plunger pump head is the core component of the plunger pump, responsible for realizing the suction and discharge process of the oil. It is generally composed of a plunger, a cylinder, and a distribution plate, and the fluid is transported by the reciprocating motion of the plunger in the cylinder. This pump is widely used in the industrial field due to its high efficiency, high pressure and large flow. The development and progress of plunger pump technology has made the design of the pump head more sophisticated and complex, improved the working efficiency and reliability of the pump, and adapted to the needs of various high pressure and complex working conditions. However, the existing technology mostly adopts a fixed connection between the plunger rod and the plunger. The plunger rod cannot be removed together with the pump head, making cleaning and maintenance difficult. In addition, the plunger pump has a fixed flow rate and a single use method.

[0003] Application No. JP2007131216 discloses a plunger pump that can be miniaturized in the axial direction, reduce the number of components, and improve the assembly efficiency of the plunger. Solution: The plunger pump is provided with a cylinder formed in the pump body, and the plunger is slidably mounted in the cylinder, and a pump chamber is defined in the cylinder at one end thereof and an eccentric cam / drive device is provided, and the brake fluid is sucked into the pump chamber by the reciprocating motion of the plunger in the cylinder. A sealing groove / circumferential groove is formed on the outer peripheral surface of the plunger, and an annular sealing member is embedded in the sealing groove. The shape of one end side is the same as the shape of the other end side at the axial center position of the plunger. This 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 slot-type segmented plunger rod plug-in pump head assembly for conveying 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 slot-type segmented plunger rod plug-in pump head assembly comprises a pump head and a plunger rod slidably connected to the pump head. A plunger rod holder is provided at one end of the plunger rod away from the pump head. One end of the plunger rod holder is connected to a plunger, and the plunger is coaxial with the plunger rod holder.

[0007] According to one embodiment of the present invention, the plunger rod holder is a rod body structure, and the other end of the rod body structure extends axially outward to have a circular plate body with a diameter greater than the diameter of the plunger rod holder, and the circular plate body extends axially outward to have a cylinder, and the cylinder extends axially outward to have a disc body, and the diameter of the disc body is smaller than that of the circular plate body, and the diameter of the disc body is greater than that of the cylinder. One end of the connecting part between the plunger and the plunger rod holder is a groove corresponding to the protruding part of the end of the plunger rod holder, and the groove is connected outward in a radial direction. A cylindrical groove is provided at one end of the rod body structure, and one end of the plunger rod is fixedly arranged inside the cylindrical groove. The fixing method of the plunger rod and the plunger rod holder includes but is not limited to heat fitting, bonding, welding, threading, etc., and the plunger, the plunger rod holder and the plunger rod are coaxially arranged.

[0008] Since the plunger pump contains a large amount of lubricating oil to lubricate the internal parts of the plunger pump, the plunger rod usually contains a large amount of lubricating grease. After repeated lubrication work, these lubricating greases may deteriorate and change color due to factors such as oxidation, high temperature or pollutants in the plunger pump, thereby reducing the working efficiency of the plunger pump or increasing the wear between the internal parts of the plunger pump. This requires personnel to maintain and clean the plunger rod in time according to the working time and intensity of the plunger pump.

[0009] When cleaning the plunger pump, since the plunger rod may be completely covered with grease, personnel need to wipe off the grease on the plunger rod to determine the connection point between the plunger rod and the plunger, so as to remove the plunger rod. The structure of a conventional plunger rod is usually fixed with screws, and personnel need to first remove the screws and then remove it in a specific direction and angle. However, it is very easy for the screws to slip when being removed in grease, and when personnel remove the plunger rod by wiping off the grease on the plunger rod, grease may be on their hands or the outside of the pump. There is a risk of slipping when lifting the machine to carry heavy parts such as the pump head, which makes the removal process more cumbersome and dangerous. The plunger rod is fixedly connected to the plunger rod holder, and the plunger rod holder and the plunger are radially plug-in connected, specifically: one end of the plunger rod holder extends axially outward to have a column with a diameter smaller than the plunger rod, and the column further extends outward to have a column with a diameter equal to the plunger rod, so that the end of the plunger rod holder has an annular notch, and the end of the plunger connected to the plunger rod holder has a groove corresponding to the annular notch, and the groove is radially connected outward, so that the column assembly at the end of the plunger rod holder can be translated and installed into the groove of the plunger, thus realizing a longitudinal plug-in connection. When installing, align the protruding part of the plunger rod holder with the plunger opening and push it in, and pull it out in the opposite direction when disassembling. The opening direction of the plunger rod holder is upward relative to the plunger pump, and no bolts or other parts are required to fix it, so personnel do not need to determine the position of the connection part when disassembling, and can directly remove it. After placing the disassembled pump head and other parts, the plunger rod maintenance and other operations can be carried out to ensure personnel safety to the greatest extent. Furthermore, since the plunger rod only needs to move in a fixed single direction to escape from the plunger groove, the structure can be dynamically disassembled, that is, it can also be disassembled during the movement of the plunger. In this way, even if the plunger pump suddenly starts working due to unexpected power-on during the disassembly process, there is no danger because personnel do not need to put their hands or tools into the plunger pump when disassembling the structure. Personnel or lifting machines can still separate the plunger rod from the plunger, greatly improving safety.

[0010] At the same time, the structure also has a certain locking effect, specifically: the plunger rod needs to move in a fixed single direction to escape from the plunger groove. The direction is vertically upward for the plunger pump. When the plunger pump is placed on a non-horizontal plane, the plunger pump is in an inclined state. When personnel remove the pump head and the plunger rod, there will be a large friction between the plunger and the plunger rod holder, making it difficult for it to escape by itself. This prevents the pump head from falling off in an inclined state after removing the bolts fixing the pump head outside the plunger pump, further avoiding danger. A portion of oil can also be pre-stored in the groove gap between the plunger rod holder and the plunger connection.

[0011] According to one embodiment of the present invention, a pump body is provided on one side of the pump head, a through hole matching the plunger rod is provided on the pump body, and a concave hole is provided on the side of the pump body. A pump body is sleeved on the outside of the pump body, and the pump body is a rectangular sleeve with one side open, and a bolt through hole is provided on the side wall of the rectangular sleeve. The bolt through hole is coaxial with the concave hole, and a fastening bolt is installed in the bolt through hole. A return spring is provided on the inside of the pump body, and the return spring is located between the pump body and the pump body, and the return spring is coaxial with the plunger rod. A through hole is provided on the side of the pump body for passing the plunger rod, and the diameter of the through hole is larger than the diameter of the plunger rod, and the through hole is coaxial with the plunger rod.

[0012] The pump head is connected to the pump body, and the connection method can be screw fixing. The pump body is sleeved on the pump body, and the pump body and the pump body are fixed by tightening bolts. The return spring can limit the position and deformation of the plunger, play an effect of protecting the internal components of the plunger pump and extending the service life of the parts.

[0013] According to one embodiment of the present invention, a working chamber is provided inside the pump head, one end of the plunger rod is located in the working chamber, and a sealing member is provided at a position connecting the pump head and the plunger rod.

[0014] 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 connected to both ends of the working chamber 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 makes reciprocating motion, continuous oil supply can be achieved.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The plunger rod holder and the plunger of this structure are radially plug-in connected. When disassembling, personnel do not need to wipe off the lubricating grease on the plunger rod to determine the position of the connection part, so as to avoid slipping during transportation due to grease accidentally sticking to personnel's hands or the outer wall of the pump, thereby ensuring personnel safety to the greatest extent. At the same time, the structure can realize dynamic disassembly. Even if the plunger pump suddenly works due to accidental power-on during the disassembly process, there is no danger because personnel do not need to put their hands or tools into the plunger pump when disassembling the structure. Personnel or lifting machines can still separate the plunger rod from the plunger, greatly improving safety. At the same time, the structure also has a certain locking effect to prevent the pump head in a tilted state from falling off by itself after removing the bolts fixing the pump head outside the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a schematic diagram of the pump head assembly scheme of the present invention; Figure 2 This is a cross-sectional schematic diagram of the pump head assembly of the present invention; Figure 3 It is a schematic diagram of the plunger structure of the present invention; Figure 4 This is a schematic diagram of the plunger rod connection method of the present invention; Figure 5 It is a cross-sectional schematic diagram of the plunger rod of the present invention; Figure 6 It is a cross-sectional schematic diagram of the matching scheme of the plunger rod and the pump head of the present invention; Figure 7 It is a schematic diagram of the pump body scheme of the present invention.

[0018] Figure numbers: 10-pump body; 101-return spring; 102-bolt through hole; 20-pump body; 201-fastening bolt; 30-pump head; 301-seal; 302-working chamber; 401-plunger rod; 402-plunger; 403-plunger rod holder. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] Embodiment 1 See attached Figure 1-Figure 7As shown, a slot-type segmented plunger rod plug-in pump head assembly includes a pump head 30 and a plunger rod 401 slidably connected to the pump head 30. A plunger rod holder 403 is provided at one end of the plunger rod 401 away from the pump head 30. One end of the plunger rod holder 403 is connected to a plunger 402, and the plunger 402 is coaxial with the plunger rod holder 403. The plunger rod holder 403 is a rod body structure, and the other end of the rod body structure axially extends outward to have a circular plate body with a diameter greater than the diameter of the plunger rod holder 403. The circular plate body axially extends outward to have a cylinder body, and the cylinder body axially extends outward to have a disc body, the diameter of the disc body is smaller than the circular plate body, and the diameter of the disc body is greater than the cylinder. One end of the connection part between the plunger 402 and the plunger rod holder 403 is a groove corresponding to the protruding part of the end of the plunger rod holder 403, and the groove is connected outward in a radial direction. A cylindrical groove is provided at one end of the rod body structure, and one end of the plunger rod 401 is fixed inside the cylindrical groove. The fixing methods of the plunger rod 401 and the plunger rod holder 403 include but are not limited to heat fitting, bonding, welding, threading, etc., and the plunger 402, the plunger rod holder 403 and the plunger rod 401 are coaxially arranged.

[0022] Since the plunger pump contains a large amount of lubricating oil to lubricate the internal parts of the plunger pump, the plunger rod 401 usually contains a large amount of lubricating grease. After repeated lubrication work, these lubricating greases may deteriorate and change color due to factors such as oxidation, high temperature or pollutants in the plunger pump, thereby reducing the working efficiency of the plunger pump or increasing the wear between the internal parts of the plunger pump. This requires personnel to maintain and clean the plunger rod 401 in time according to the working time and intensity of the plunger pump.

[0023] When cleaning the plunger pump, since the plunger rod 401 may be completely covered with grease, the personnel need to wipe off the grease wrapped on the plunger rod 401 to determine the connection between the plunger rod 401 and the plunger 402, so as to remove the plunger rod 401. The structure of the conventional plunger rod 401 is usually fixed with screws, and the personnel need to first remove the screws and then remove it in a specific direction and angle. However, it is very easy for the screws to slip when being removed in grease, and when the personnel remove the grease on the plunger rod 401 to remove the plunger rod 401, grease may be on their hands or the outside of the pump, and there is a risk of slipping when the lifting machine is used to carry heavy parts such as the pump head 30, which makes the removal process more cumbersome and has certain risks. In this structure, the plunger rod 401 is fixedly connected to the plunger rod holder 403, and the plunger rod holder 403 and the plunger 402 are radially plug-in connected, specifically: one end of the plunger rod holder 403 axially extends outward to have a column with a diameter smaller than the plunger rod 401, and the column further extends outward to have a column with a diameter equal to that of the plunger rod 401, so that the end of the plunger rod holder 403 has an annular notch, and the end of the plunger 402 connected to the plunger rod holder 403 has a groove corresponding to the annular notch, and the groove is radially connected outward, so that the column assembly at the end of the plunger rod holder 403 can be translated and installed into the groove of the plunger 402, thereby realizing a longitudinal plug-in connection. During installation, align the protruding part of the plunger rod holder 403 with the opening of the plunger 402 and push it in. During disassembly, pull it out in the opposite direction. The opening direction of the plunger rod holder 403 is upward relative to the plunger pump, and no bolts or other parts are required to fix it. Therefore, personnel do not need to determine the position of the connecting part during disassembly, and can directly dismantle it. After placing the disassembled pump head 30 and other parts, perform maintenance and other operations on the plunger rod 401 to ensure personnel safety to the greatest extent. Furthermore, since the plunger rod 401 only needs to move in a fixed single direction to be able to escape from the groove of the plunger 402, the structure can achieve dynamic disassembly, that is, it can also be disassembled during the movement of the plunger 402. Specifically, after removing the connecting screws between the pump head 30 and the pump body 20, the pump head 30 is pulled outward. At this time, the plunger rod 401 and the plunger 402 are in a connected state. However, since the plunger rod 401 can be separated from the plunger 402 by simply moving the pump head 30 and the plunger rod 401 horizontally upward at the same time, the movement of the plunger 402 will not affect the disassembly of the plunger rod 401. In this way, even if the plunger pump is suddenly powered on during the disassembly process and suddenly works, there is no danger because personnel do not need to insert their hands or tools into the plunger pump when disassembling the structure. Personnel or lifting machines can still separate the plunger rod 401 from the plunger 402, thereby greatly improving safety.

[0024] At the same time, the structure also has a certain locking effect, specifically: the plunger rod 401 needs to move in a fixed single direction to be able to escape from the plunger 402 groove, which is specifically vertically upward for the plunger pump. When the plunger pump is placed on a non-horizontal plane, the plunger pump is in an inclined state. When personnel disassemble the pump head 30 and the plunger rod 401, the opening direction of the plunger 402 groove is not horizontally upward, but at an acute angle to the horizontal plane. However, the force of personnel carrying or machine lifting is horizontally upward. In this way, the forces at two different angles cause a large friction between the plunger 402 and the plunger rod holder 403, making it difficult to escape by itself. This prevents the pump head 30 in an inclined state from falling off by itself after the bolts fixing the pump head 30 outside the plunger pump are removed, further avoiding danger. A portion of oil can also be pre-stored in the groove gap between the plunger rod holder 403 and the plunger 402 connection.

[0025] A pump body 20 is provided on one side of the pump head 30. The pump body 20 is a rectangular block with a through hole. A concave hole is provided on the side wall of the rectangular block, and a plunger rod 401 passes through the center of the through hole. A pump body 10 is sleeved on the outside of the pump body 20. The pump body 10 is a rectangular sleeve with one side open. A bolt through hole 102 is provided on the side wall of the rectangular sleeve. The bolt through hole 102 is coaxial with the concave hole, and a fastening bolt 201 is installed in the bolt through hole 102. A return spring 101 is provided on the inside of the pump body 10. The return spring 101 is located between the pump body 10 and the pump body 20, and the return spring 101 is coaxial with the plunger rod 401. A through hole is provided on the side of the pump body 10 for passing the plunger rod 401. The diameter of the through hole is larger than the diameter of the plunger rod 401, and the through hole is coaxial with the plunger rod 401.

[0026] The pump head 30 is connected to the pump body 20, and the connection method can be screw fixing. The pump body 10 is sleeved on the pump body 20, and the pump body 10 and the pump body 20 are fixed by tightening bolts 201. The return spring 101 can limit the position and deformation of the plunger 402, thereby protecting the internal components of the plunger pump and extending the service life of the parts.

[0027] A working chamber 302 is provided inside the pump head 30 , one end of the plunger rod 404 is located in the working chamber 302 , and a sealing member 301 is provided at a position connecting the pump head 30 and the plunger rod 404 .

[0028] The power mechanism pushes the plunger rod 401, thereby pushing the plunger 402, causing the plunger 402 to move in one direction, resulting in negative pressure in the working chamber 302. The two ends of the pump head 30 in the working chamber 302 are respectively connected to the outside with oil pipes, so that the liquid is sucked into the cylinder; when the plunger 402 finishes a stroke and moves in another direction, the liquid is compressed and the liquid sucked into the cylinder is discharged. Since the plunger 402 performs reciprocating motion, continuous oil supply can be achieved.

[0029] 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 holder 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.

[0030] 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 slot-type segmented plunger rod plug-in pump head assembly, comprising a pump head (30) and a plunger rod (401) slidably connected to the pump head (30), Features: A plunger rod holder (403) is provided at one end of the plunger rod (401) away from the pump head (30); one end of the plunger rod holder (403) is connected to the plunger (402); the plunger (402) and the plunger rod holder (403) are coaxial.

2. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 1 is characterized in that: The plunger rod holder (403) is a rod body structure, one end of the rod body structure has a circular plate body extending axially outwards, the diameter of the circular plate body is larger than the diameter of the plunger rod holder (403), the circular plate body has a column body extending axially outwards, the column body has a disc body extending axially outwards, the diameter of the disc body is smaller than the diameter of the circular plate body, and the diameter of the disc body is larger than the diameter of the column.

3. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 2 is characterized in that: One end of the connection portion between the plunger (402) and the plunger rod holder (403) is a groove corresponding to the protruding portion of the end of the plunger rod holder (403), and the groove is communicated outward in a radial direction.

4. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 2, characterized in that: A cylindrical groove is provided at one end of the plunger rod holder (403), one end of the plunger rod (401) is fixed inside the cylindrical groove, and the plunger (402), the plunger rod holder (403) and the plunger rod (401) are coaxially arranged.

5. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 1, characterized in that: A pump body (20) is provided on one side of the pump head (30), a through hole cooperating with the plunger rod (401) is provided on the pump body (20), and a concave hole is provided on the side of the pump body (20).

6. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 5, characterized in that: A pump body (10) is sleeved on the outside of the pump body (20); the pump body (10) is a rectangular sleeve with an opening on one side; a bolt through hole (102) is provided on a side wall of the rectangular sleeve.

7. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 6, characterized in that: The bolt through hole (102) is coaxial with the recessed hole, and a fastening bolt (201) is installed in the bolt through hole (102).

8. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 6, characterized in that: A return spring (101) is provided inside the pump body (10), the return spring (101) is located between the pump body (10) and the pump body (20), and the return spring (101) is coaxial with the plunger rod (401).

9. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 6, characterized in that: A through hole is provided on the side of the pump body (10); the diameter of the through hole is larger than the diameter of the plunger rod (401); and the through hole is coaxial with the plunger rod (401).

10. The plug-in pump head assembly of the slot-type segmented plunger rod according to claim 1, characterized in that: A working chamber (302) is provided inside the pump head (30), one end of the plunger rod (404) is located in the working chamber (302), and a sealing member (301) is provided at a position in the pump head (30) that is connected to the plunger rod (404).

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