Plunger pump single body and plunger pump

Abstract

The invention provides a plunger pump single body and a plunger pump. The plunger pump single body comprises a shell, two plungers arranged in the shell and a driving piece for driving the two plungers to do linear reciprocating motion at the same time. Wherein the driving part comprises an eccentric wheel, a main shaft used for driving the eccentric wheel to rotate and two driving shafts used for driving the two plungers to do linear reciprocating motion respectively, the driving shafts are arranged in a sliding way in the shell in a sliding mode, one ends of the driving shafts make contact with the outer contour wall of the eccentric wheel through driven wheels, and the other ends of the driving shafts are coaxially connected with the plungers; the eccentric wheel is positioned between the two driven wheels; a buffer layer is arranged on the outer contour wall of the driven wheel and / or the outer contour wall of the eccentric wheel. According to the plunger pump, the buffer layer is arranged on the driven wheel and / or the eccentric wheel, impact generated on the driven wheel in the rotating process of the eccentric wheel is buffered through the buffer layer, impact noise is reduced, impact on the main shaft is reduced, accordingly, radial stress abrasion of the main shaft bearing is reduced, and the service life of the main shaft bearing is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and in particular to a plunger pump monomer and a plunger pump. Background Art

[0002] The plunger pump is a volumetric pump. Its working principle is to use the plunger to change the volume of the pump chamber during the reciprocating motion, so as to suck the liquid into the pump chamber and discharge it outward. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation. The plunger pump is widely used in high pressure, large flow and flow regulation occasions, such as hydraulic presses, engineering machinery and ships.

[0003] The operating frequency of a reciprocating piston pump is usually between tens and hundreds of times per minute, depending on the design specifications and working requirements of the pump. For example, the operating frequency of some high-pressure reciprocating piston pumps may reach more than 300 times per minute to meet specific working requirements.

[0004] In the prior art, a Chinese invention patent with publication number CN110848110B discloses a plunger pump, in which an eccentric wheel is driven by a main shaft to perform rotational motion. During the rotational motion of the eccentric wheel, two driving shafts are simultaneously driven to perform linear motion by two first rollers in contact with each other. After a sleeve is arranged outside the driving shaft, the sleeve and the driving shaft are connected by a compression spring. Under the action of the compression spring, the relevant return components form a gapless contact with the outer contour surface of the eccentric wheel and maintain a tight fit. Therefore, during the rotation of the eccentric wheel, the driving shaft will not produce impact noise with the eccentric wheel, and a smooth transition is achieved during the different angular velocity movements of the eccentric wheel, thereby ensuring the stability of the main shaft force.

[0005] However, in actual use, it was found that the existing plunger pump has the following problems: during the rotation of the eccentric wheel, pressure along the axial direction of the drive shaft is periodically applied to the two first rollers, causing the compression spring between the sleeve and the drive shaft to be periodically stressed. After long-term and high-frequency use, the compression spring may become fatigued. This is mainly manifested in the deterioration of the elasticity of the compression spring, the loss of elasticity or deformation of the compression spring, and even cracks and fractures. The first roller cannot maintain a close fit with the outer contour surface of the eccentric wheel, causing the eccentric wheel to produce collision noise with the first roller during rotation.

[0006] Due to the limited life of the compression spring, this type of plunger pump requires regular maintenance and replacement of the compression spring, which seriously restricts the continuous working time of the plunger pump and directly affects the performance and life of the plunger pump. Summary of the invention

[0007] The object of the present invention is to provide a plunger pump unit and a plunger pump to solve at least one technical problem raised in the background technology.

[0008] In order to achieve the above object, in a first aspect, the present invention provides a plunger pump monomer, comprising:

[0009] case;

[0010] two plungers movably disposed in the housing; and,

[0011] A driving member that simultaneously drives the two plungers to perform linear reciprocating motion; wherein,

[0012] The driving member includes an eccentric wheel, a main shaft for driving the eccentric wheel to rotate, and two driving shafts for respectively driving the two plungers to perform linear reciprocating motion, wherein the driving shaft is slidably arranged in a slideway in the housing, one end of the driving shaft contacts the outer contour wall of the eccentric wheel through a driven wheel, and the other end is coaxially connected to the plunger;

[0013] The eccentric wheel is arranged between the two driven wheels;

[0014] A buffer layer is arranged on the outer contour wall of the driven wheel and / or the outer contour wall of the eccentric wheel.

[0015] Furthermore, the buffer layer includes a buffer cushion layer and a steel ring sleeve; the steel ring sleeve is arranged on the outer peripheral wall of the buffer cushion layer.

[0016] Furthermore, the buffer layer includes a rubber layer, a silicone layer or a polyurethane layer.

[0017] Furthermore, the centers of the two driven wheels and the center of the end section of the main shaft are located on the same straight line, and the spacing between the outer contours of the two driven wheels is equal to the diameter of the eccentric wheel.

[0018] Furthermore, a connecting plate is connected to one end of the driving shaft close to the eccentric wheel, a mounting groove is arranged in the middle of the connecting plate, and the driven wheel is rotatably mounted in the mounting groove;

[0019] The upper and lower ends of the two connecting plates are fixedly connected by two connecting pipes respectively.

[0020] Furthermore, the two connecting pipes are arranged parallel to the axis of the driving shaft;

[0021] Guide rods are slidably arranged in the two connecting pipes, and both ends of the guide rods are respectively fixedly mounted on the shell.

[0022] Furthermore, the distance between the two connecting plates is adjustable.

[0023] In the second aspect, the present invention also provides a plunger pump, comprising n groups of plunger pump units as described in the first aspect, wherein the n groups of plunger pump units are sequentially combined and arranged along the axial direction of the main shaft; the main shafts of the n groups of plunger pump units are coaxially and integrally arranged, n≥2, and n is an integer.

[0024] Furthermore, the eccentric wheels in the n groups of plunger pump units are staggered in sequence along a preset direction, and the staggered angle between the eccentric wheels in two adjacent plunger pump units is 360° / n.

[0025] Furthermore, it also includes two hydraulic end assemblies located on both sides of the shell and arranged opposite to each other, and the water outlets of the two hydraulic end assemblies are connected by a drainage pipe;

[0026] The drain pipe is a straight pipe, a water outlet is arranged in the middle of the drain pipe, and both ends of the drain pipe are respectively connected to the water outlet holes of the two hydraulic end assemblies.

[0027] The beneficial effects of the present invention are embodied in:

[0028] 1. The plunger pump provided by the present invention is provided with a buffer layer on the driven wheel and / or the eccentric wheel, and the buffer layer is used to buffer the impact of the driven wheel generated during the rotation of the eccentric wheel, thereby reducing the impact noise and the impact on the main shaft, thereby reducing the radial force wear of the main shaft bearing and extending the service life of the main shaft bearing.

[0029] 2. The compression spring on the driving shaft of the existing plunger pump is cancelled, so that the working cycle and performance of the plunger pump are not limited by the life of the compression spring, which greatly improves the actual performance of the plunger pump.

[0030] 3. The n eccentric wheels inside the plunger pump provided by the present invention are coaxial and staggered in sequence along a preset direction, and the staggered angle between the eccentric wheels in two adjacent plunger pump units is 360° / n, so that the n eccentric wheels are evenly distributed on a 360° circumference. In this way, when the main shaft drives the eccentric wheels to rotate, the combined force of the n eccentric wheels on the main shaft is minimized, thereby reducing the radial force wear of the main shaft bearing and extending the service life of the main shaft bearing.

[0031] 4. The plunger pump provided by the present invention is connected between the water outlet holes of the two hydraulic end assemblies by a drain pipe. The drain pipe is a straight pipe. The two ends of the drain pipe are respectively connected to the water outlet holes of the two hydraulic end assemblies. A water outlet is arranged in the middle of the drain pipe. The fluid counter-pressure principle is utilized to greatly alleviate the vibration problem caused by flow pulsation during the operation of the existing reciprocating plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a plunger pump provided in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the structure of a plunger pump unit provided in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of a reference state between an eccentric wheel and two driven wheels during rotation provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of the structure of a buffer layer provided in an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the resultant force generated on the right driven wheel during the rotation of the eccentric wheel provided by an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of the connection structure between a connecting plate and a connecting pipe provided in an embodiment of the present invention.

[0038] In the accompanying drawings, the housing 1, the plunger 2, the eccentric wheel 3, the main shaft 4, the driving shaft 5, the driven wheel 6, the water outlet 7, the buffer cushion layer 8, the steel ring 9, the connecting plate 10, the mounting groove 11, the connecting pipe 12, the guide rod 13, the hydraulic end assembly 14, the drain pipe 15, the water outlet 16, the buffer layer 17, the main shaft bearing 18, the connecting part 19, the limiting convex ring 20, the gasket 21, and the bearing 22. DETAILED DESCRIPTION

[0039] The specific implementation of the present invention will be described in more detail below in conjunction with the schematic diagram. The advantages and features of the present invention will become clearer based on the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0040] like Figure 1 As shown, a schematic diagram of the structure of a plunger pump provided by an embodiment of the present invention includes n groups of plunger pump monomers arranged in sequence along the axial direction of the main shaft 4, wherein n≥2, and n is an integer. In the actual implementation process, the plunger pump can generally be arranged in 3 groups, 4 groups or 5 groups. It should be noted that in this embodiment, there is no specific restriction on the number of groups of plunger pump monomers included in the plunger pump.

[0041] like Figure 2As shown, the plunger pump monomer in this embodiment includes a housing 1, two plungers 2 movably arranged in the housing 1, and a driving member that drives the two plungers 2 to perform linear reciprocating motion at the same time. Among them, the driving member includes an eccentric wheel 3, a main shaft 4 for driving the eccentric wheel 3 to rotate, and two driving shafts 5 for respectively driving the two plungers 2 to perform linear reciprocating motion. One end of the driving shaft 5 is in contact with the outer contour wall of the eccentric wheel 3 through the driven wheel 6, and the other end is coaxially connected to the plunger 2. The driving shaft 5 is slidably arranged in a slideway in the housing 1. The driving shaft 5 can slide along its axial direction in the slideway through a linear bearing. The driving shaft 5 and the linear bearing can be lubricated by lubricating oil. The lubricating oil plays a role in reducing the friction coefficient and reducing the wear and heat of the driving shaft 5. The driving shaft 5 and the end of the linear bearing can be sealed by an oil seal to prevent the leakage of the lubricating oil.

[0042] The eccentric wheel 3 is arranged between two driven wheels 6. When an external power device, such as an electric motor, drives the eccentric wheel 3 to rotate through the main shaft 4, the eccentric wheel 3 drives the driving shaft 5 to reciprocate along the axial direction of the slideway through the driven wheel 6, thereby driving the plunger 2 to reciprocate. Figure 3 As shown, when the eccentric wheel 3 rotates, during the switching process between the maximum eccentricity and the minimum eccentricity, the eccentric wheel 3 will only contact one of the driven wheels 6 .

[0043] like Figure 2 As shown, in order to maximize the use of the stroke of the eccentric wheel 3 during rotation, the centers of the two driven wheels 6 and the center of the end section of the main shaft 4 are located on the same straight line, and the spacing between the outer contours of the two driven wheels 6 is equal to the diameter of the eccentric wheel 3. In this way, the eccentric wheel 3 pushes the driven wheel 6 on one side the longest distance during the rotation of 0°-180°, and pushes the driven wheel 6 on the other side the longest distance during the rotation of 180°-360°, so that the main shaft 4 does the most work on the drive shaft 5 when it rotates one circle.

[0044] In this embodiment, Figure 2 As shown, the two drive shafts 5 are connected to a connecting plate 10 at one end close to the eccentric wheel 3, and a mounting groove 11 is provided in the middle of the connecting plate 10. The driven wheel 6 is rotatably mounted in the mounting groove 11 through the wheel axle. The upper and lower ends of the two connecting plates 10 are fixedly connected by two connecting pipes 12, so as to keep the distance between the two connecting plates 10 fixed, so that the distance between the outer contours of the two driven wheels 6 can be kept fixed.

[0045] It is understandable that, for example, Figure 2As shown in the figure, when the eccentric wheel 3 rotates upward clockwise, the eccentric wheel 3 will break contact with the driven wheel 6 on the left and continue to drive the driven wheel 6 on the right to move to the right. In actual operation, during the rotation of the eccentric wheel 3, it is possible that the eccentric wheel 3 and the driven wheel 6 on the right are not tightly fitted, resulting in impact noise, causing a unilateral impact on the main shaft 4, and causing radial force wear on the main shaft bearing 18 that supports the rotation of the main shaft 4, greatly reducing the service life of the main shaft 4 and the main shaft bearing 18. Similarly, the aforementioned collision phenomenon may also occur during the process of the eccentric wheel 3 driving the driven wheel 6 on the left to move to the left.

[0046] To solve this problem, in a feasible embodiment, a buffer layer 17 can be provided on the outer contour wall of the driven wheel 6, or, in another feasible embodiment, a buffer layer 17 can also be provided on the outer contour wall of the eccentric wheel 3, or, in yet another feasible embodiment, a buffer layer 17 can be provided on both the outer contour wall of the driven wheel 6 and the outer contour wall of the eccentric wheel 3, so that the driven wheel 6 and the eccentric wheel 3 can be buffered by the buffer layer 17 when they are in contact.

[0047] Specifically, Figure 4 As shown, the buffer layer 17 includes a buffer layer 8 and a steel ring sleeve 9. The buffer layer 8 is arranged on the outer contour wall of the driven wheel 6 or the eccentric wheel 3, and the steel ring sleeve 9 is arranged on the outer peripheral wall of the buffer layer 8. The steel ring sleeve 9 is used to improve the wear resistance of the entire driven wheel 6 or the eccentric wheel 3. A bearing 22 is arranged inside the driven wheel 6, and the driven wheel 6 is rotatably mounted on the wheel shaft on the mounting groove 11 through the bearing 22. The eccentric wheel 3 can be integrally formed with the main shaft 4.

[0048] In specific implementation, in order to facilitate production and assembly, the buffer layer 17 can be provided only on the outer contour wall of the driven wheel 6. Figure 2 as shown in .

[0049] Specifically, the cushion layer 8 can be a rubber layer, a silicone layer or a polyurethane layer. The cushion layer 8 can buffer the impact of the eccentric wheel 3 on the driven wheel 6 during the rotation process, thereby reducing the impact on the main shaft 4, reducing the radial force wear of the main shaft bearing 18, extending the service life of the main shaft 4 and the main shaft bearing 18, and effectively reducing the impact noise, reducing the impact noise by about two times.

[0050] In this embodiment, the two connecting pipes 12 are arranged parallel to the axial direction of the driving shaft 5. A guide rod 13 is slidably arranged in the two connecting pipes 12, and both ends of the guide rod 13 are fixedly mounted on the housing 1 by bolts. The connecting pipe 12 and the guide rod 13 can be lubricated by lubricating oil to reduce the friction coefficient and reduce the wear between the connecting pipe 12 and the guide rod 13.

[0051] The guide rod 13 can play a guiding and supporting role. For example, when Figure 2 When the eccentric wheel 3 rotates upward clockwise, the eccentric wheel 3 will generate a force on the driven wheel 6 on the right side. Figure 5 As shown in the figure, it can be understood that the resultant force F will change with the rotation angle of the eccentric wheel 3. The resultant force F is decomposed into a vertical downward component F1 and a horizontal rightward component F2. The component F2 is used to push the right drive shaft 5 to move rightward along its axial direction, but the component F1 will also be transmitted to the right drive shaft 5. After working for a long time, the component F1 will cause the right drive shaft 5 to bend, resulting in the movement of the drive shaft 5 not meeting the linearity requirements, and increasing the wear between the drive shaft 5 and the linear bearing.

[0052] Similarly, when Figure 2 When the eccentric wheel 3 continues to rotate clockwise by more than 180°, the eccentric wheel 3 will generate a vertical upward component force and a horizontal left component force on the left driven wheel 6. The horizontal left component force pushes the left driving shaft 5 to move leftward along its axial direction, and the vertical upward component force will also be transmitted to the left driving shaft 5.

[0053] In this embodiment, two vertically opposite guide rods 13 are arranged in parallel, and the guide rods 13 can bear the vertical downward force F1 or the vertical upward force, reduce the radial load of the drive shaft 5, and improve the service life of the drive shaft 5. At the same time, the two connecting pipes 12 can only slide linearly along the axial direction of the guide rods 13, maintain the linearity required for the reciprocating motion of the drive shaft 5, and improve the reliability of the drive shaft 5 during linear motion.

[0054] It is understandable that, although lubricating oil can also be used between the eccentric wheel 3 and the driven wheel 6, after long-term operation, a certain amount of wear will occur between the outer contour of the eccentric wheel 3 and the steel ring sleeve 9 of the driven wheel 6, resulting in the spacing between the outer contours of the two driven wheels 6 being larger than the diameter of the eccentric wheel 3. As a result, the gap between the eccentric wheel 3 and the corresponding driven wheel 6 increases during the rotation process, and the impact of the eccentric wheel 3 on the driven wheel 6 increases.

[0055] To improve this situation, in this embodiment, the distance between the two connecting plates 10 is adjustable, so that the distance between the outer contours of the two driven wheels 6 can be adjusted to be equal to the diameter of the eccentric wheel 3. Specifically, Figure 6 As shown, the end of the connecting plate 10 has a connecting portion 19, which is sleeved on the connecting pipe 12. The end of the connecting pipe 12 has a limiting protrusion 20. A plurality of gaskets 21 of preset thickness are arranged between the connecting portion 19 and the limiting protrusion 20. The connecting portion 19 and the limiting protrusion 20 are fixedly connected by bolts.

[0056] By removing different numbers of gaskets 21 in sequence, the spacing between the two connecting plates 10 can be adjusted. The thickness of the gasket 21 can be set by collecting the wear data between the eccentric wheel 3 and the steel ring sleeve 9 of the driven wheel 6 within a preset period. For example, if the wear data of the eccentric wheel 3 and the steel ring sleeve 9 is measured to be 0.05 mm per month, the thickness of the gasket can be set to 0.1 mm or 0.15 mm, that is, the spacing between the two connecting plates 10 is adjusted every 2 months or every 3 months.

[0057] In this embodiment, the main shafts 4 of n groups of plunger pump monomers are coaxially and integrally arranged, that is, the eccentric wheels 3 of all plunger pump monomers are installed on one main shaft 4, and the eccentric wheels 3 can be integrally formed with the main shaft 4. The two ends of the main shaft 4 are rotatably mounted on the side wall of the housing 1 through corresponding main shaft bearings 18. One end of the main shaft 4 is connected to an external power device, and the main shaft 4 is driven to rotate by the external power device, so that all eccentric wheels 3 on the main shaft 4 can rotate at the same time.

[0058] In this embodiment, the eccentric wheels 3 in n groups of plunger pump monomers are sequentially staggered along a preset direction, for example, they can be sequentially staggered in a clockwise direction or a counterclockwise direction, and the staggered angle between the eccentric wheels 3 in two adjacent plunger pump monomers is 360° / n. For example, in one embodiment, if three groups of plunger pump monomers are provided in the plunger pump, the staggered angle between two adjacent eccentric wheels 3 is 120°; in another embodiment, if four groups of plunger pump monomers are provided in the plunger pump, the staggered angle between two adjacent eccentric wheels 3 is 90°; in another embodiment, if five groups of plunger pump monomers are provided in the plunger pump, the staggered angle between two adjacent eccentric wheels 5 is 72°.

[0059] The n eccentric wheels 3 are coaxial and staggered in sequence along a preset direction, and the staggered angle between the eccentric wheels in two adjacent plunger pump units is 360° / n, so that the n eccentric wheels are evenly distributed on a 360° circumference. In this way, when the main shaft 4 drives the eccentric wheels 3 to rotate, the combined force of the n eccentric wheels 3 on the main shaft 4 is minimal, thereby reducing the radial force wear of the main shaft bearing 18 and extending the service life of the main shaft bearing 18.

[0060] In this embodiment, Figure 2 As shown, the plunger pump also includes two hydraulic end assemblies 14 located on both sides of the housing 1 and arranged opposite to each other. The hydraulic end assembly 14 can be an existing hydraulic end assembly for a plunger pump. The plunger pump may experience flow pulsation during use. The flow pulsation of the plunger pump refers to the phenomenon that the water flow at the water outlet 7 of the hydraulic end assembly 14 changes sharply in a short period of time, which is manifested as a periodic change in the outlet pressure of the hydraulic end assembly 14. This phenomenon will cause the performance and stability of the plunger pump to decline, and have an adverse effect on the production process.

[0061] There is a one-way valve in the water inlet 16 and the water outlet 7 of the hydraulic end assembly 14. The inlet one-way valve is a suction valve that can only suck liquid into the hydraulic end assembly 14 but not discharge it. The outlet one-way valve is a discharge valve that can only discharge liquid out of the hydraulic end assembly 14 but not suck it in. Figure 2 As shown, when the plunger 2 on the left moves to the right, the pressure in the cylinder of the left hydraulic end assembly decreases, the suction valve opens, and the liquid is sucked into the hydraulic end assembly. When the plunger 2 on the left moves to the left, the pressure in the cylinder of the hydraulic end assembly 4 increases, the suction valve closes, the discharge valve opens, and the liquid is pressed out. Because the plunger 2 is reciprocating, the inlet and outlet pressures of the hydraulic end assembly 4 are unstable and pulsation occurs. In addition, the reciprocating motion itself is uneven, and the direction is changed through the point where the speed is zero. The speed at each point of the plunger 2 movement is not the same, and the instantaneous flow rate of the liquid discharged or sucked is not equal. Therefore, its output characteristics are uneven and change periodically. This is the reason why the reciprocating plunger pump produces flow pulsation.

[0062] In order to reduce the flow pulsation phenomenon that may occur during the use of the plunger pump, in this embodiment, Figure 2 As shown, the water outlets of the two hydraulic end assemblies 14 are connected by a drain pipe 15. The drain pipe 15 is a straight pipe, and a water outlet 16 is arranged in the middle of the drain pipe 15. Both ends of the drain pipe 15 are connected to the water outlets of the two hydraulic end assemblies 14 respectively.

[0063] The water discharged from the water outlet holes of the two hydraulic end assemblies 14 moves from both ends of the drain pipe 15 to the water outlet 16 in the middle of the drain pipe 15. Since the water outlet 16 is located in the middle of the drain pipe 15, the water discharged from the water outlet holes of the two hydraulic end assemblies 14 moves to the water outlet 16 at the same distance, and counter-acts at the water outlet 16, and then is discharged outward from the water outlet 16. The use of the fluid counter-acting principle can greatly alleviate the vibration problem caused by the flow pulsation phenomenon during the operation of the existing reciprocating plunger pump.

[0064] In summary, the plunger pump provided in the present application is provided with a buffer layer on the driven wheel and / or eccentric wheel, and the buffer layer is used to buffer the impact of the driven wheel generated during the rotation of the eccentric wheel, thereby reducing the impact noise and the impact on the main shaft, thereby reducing the radial force wear of the main shaft bearing and extending the service life of the main shaft bearing.

[0065] At the same time, the plunger pump provided in the present application eliminates the compression spring on the drive shaft of the existing plunger pump, so that the working cycle and performance of the plunger pump are not limited by the life of the compression spring, which greatly improves the actual performance of the plunger pump.

[0066] Furthermore, the n eccentric wheels inside the plunger pump provided in the present application are coaxial and staggered in sequence along a preset direction, and the staggered angle between the eccentric wheels in two adjacent plunger pump units is 360° / n, so that the n eccentric wheels are evenly distributed on a 360° circumference. In this way, in the process of the main shaft driving the eccentric wheels to rotate, the resultant force of the n eccentric wheels on the main shaft is minimized, thereby reducing the radial force wear of the main shaft bearings and extending the service life of the main shaft bearings.

[0067] Finally, the plunger pump provided in the present application is connected between the water outlet holes of the two hydraulic end assemblies through a drain pipe. The drain pipe is a straight pipe. The two ends of the drain pipe are respectively connected to the water outlet holes of the two hydraulic end assemblies. A water outlet is arranged in the middle of the drain pipe. The fluid counteraction principle is utilized to greatly alleviate the vibration problem caused by flow pulsation during the operation of the existing reciprocating plunger pump.

[0068] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A plunger pump monomer, characterized in that: include: Housing (1); Two plungers (2) movably arranged in the housing (1); as well as, A driving member that simultaneously drives the two plungers (2) to perform linear reciprocating motion; wherein: The driving member comprises an eccentric wheel (3), a main shaft (4) for driving the eccentric wheel (3) to rotate, and two driving shafts (5) for respectively driving the two plungers (2) to perform linear reciprocating motion, wherein the driving shaft (5) is slidably arranged in a slideway in the housing (1), one end of the driving shaft (5) is in contact with the outer contour wall of the eccentric wheel (3) through a driven wheel (6), and the other end is coaxially connected to the plunger (2); The eccentric wheel (3) is arranged between the two driven wheels (6); A buffer layer (17) is provided on the outer contour wall of the driven wheel (6) and / or on the outer contour wall of the eccentric wheel (3).

2. A plunger pump monomer as claimed in claim 1, characterized in that: The buffer layer (17) comprises a buffer cushion layer (8) and a steel ring sleeve (9); the steel ring sleeve (9) is arranged on the outer peripheral wall of the buffer cushion layer (8).

3. A plunger pump monomer as claimed in claim 2, characterized in that: The buffer cushion layer (8) comprises a rubber layer, a silicone layer or a polyurethane layer.

4. A plunger pump monomer as claimed in claim 1, characterized in that: The centers of the two driven wheels (6) and the center of the end section of the main shaft (4) are located on the same straight line, and the spacing between the outer contours of the two driven wheels (6) is equal to the diameter of the eccentric wheel (3).

5. A plunger pump monomer as claimed in claim 1, characterized in that: A connecting plate (10) is connected to one end of the driving shaft (5) close to the eccentric wheel (3), a mounting groove (11) is provided in the middle of the connecting plate (10), and the driven wheel (6) is rotatably mounted in the mounting groove (11); The upper and lower ends of the two connecting plates (10) are fixedly connected via two connecting pipes (12) respectively.

6. A plunger pump monomer as claimed in claim 5, characterized in that: The two connecting pipes (12) are both arranged axially parallel to the driving shaft (5); Guide rods (13) are slidably arranged in the two connecting pipes (12), and both ends of the guide rods (13) are respectively fixedly mounted on the housing (1).

7. A plunger pump monomer as claimed in claim 6, characterized in that: The distance between the two connecting plates (10) is adjustable.

8. A plunger pump, characterized in that: It comprises n groups of plunger pump monomers as described in any one of claims 1 to 7, wherein the n groups of plunger pump monomers are sequentially combined and arranged along the axial direction of the main shaft (4); the main shafts (4) of the n groups of plunger pump monomers are coaxially and integrally arranged, n≥2, and n is an integer.

9. A plunger pump as claimed in claim 8, characterized in that: The eccentric wheels (3) in the n groups of plunger pump monomers are sequentially staggered along a preset direction, and the staggered angle between the eccentric wheels (3) in two adjacent plunger pump monomers is 360° / n.

10. A plunger pump as claimed in claim 8, characterized in that: It also comprises two hydraulic end assemblies (14) located on both sides of the housing (1) and arranged opposite to each other, and the water outlet holes of the two hydraulic end assemblies (14) are connected via a drainage pipe (15); The drainage pipe (15) is a straight pipe, a water outlet (16) is provided in the middle of the drainage pipe (15), and both ends of the drainage pipe (15) are respectively connected to the water outlet holes of the two hydraulic end assemblies (14).

Images