Plunger pump single body and plunger pump

Abstract

The utility model 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 utility model relates to mechanical equipment technical field especially relates to a plunger pump monomer and plunger pump. BACKGROUND

[0002] The plunger pump is a kind of volumetric pump, and its working principle is to change the volume of pump cavity in the reciprocating process of plunger, so that liquid is sucked into pump cavity and discharged 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 occasions such as hydraulic machine, engineering machinery and ship, which require high pressure, large flow and flow regulation.

[0003] The working frequency of reciprocating plunger pump is usually between dozens of times and hundreds of times per minute, depending on the design specification and working requirement of pump.For example, the working frequency of some high-pressure reciprocating plunger pump can reach more than 300 times per minute to meet the specific working requirement.

[0004] In the prior art, the Chinese utility model patent with publication number CN110848110B discloses a plunger pump, which is driven by a main shaft to rotate eccentrically, and in the process of eccentric rotation, two first rollers in contact simultaneously drive two drive shafts to move linearly, and after a sleeve is provided on the drive shaft, the sleeve and the drive shaft are connected by a compression spring, and under the action of the compression spring, the related return components and the outer contour surface of the eccentric wheel form a gapless contact, and the state of close fitting is maintained, so that in the process of eccentric rotation, the drive shaft will not produce impact noise with the eccentric wheel, and the stability of the force on the main shaft is ensured in the process of different angular velocity of the eccentric wheel.

[0005] However, in the actual use process, it is found that the existing plunger pump has the following problems: in the process of eccentric rotation, the two first rollers are periodically subjected to axial pressure along the drive shaft, causing the compression spring between the sleeve and the drive shaft to be subjected to periodic stress.After long-term high-frequency use, the structure of the compression spring may be subject to fatigue phenomenon.The main performance is that the elasticity of the compression spring is poor, the compression spring loses elasticity or deforms, and even cracks and breaks, etc., the first roller cannot maintain the state of close fitting with the outer contour surface of the eccentric wheel, causing the eccentric wheel to produce impact noise with the first roller in the process of rotation.

[0006] Due to the life limitation of the compression spring, the plunger pump of this type needs to be regularly maintained and the compression spring needs to be replaced, which seriously restricts the continuous working time of the plunger pump and directly affects the performance and life of the plunger pump. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing a plunger pump monomer and plunger pump to solve at least one technical problem proposed in the background art.

[0008] To achieve the above object, the utility model provides a kind of plunger pump monomer, comprising:

[0009] Shell;

[0010] Two plungers movably arranged in the shell;And,

[0011] Driving two plungers to make linear reciprocating motion simultaneously driving member;Wherein,

[0012] The driving member includes eccentric wheel, main shaft for driving the eccentric wheel rotation and two driving shafts for driving two plungers to make linear reciprocating motion respectively, the driving shaft is slidably arranged in the slide in the shell, one end of the driving shaft is in contact with the outer contour wall of the eccentric wheel through driven wheel, and the other end is coaxially connected with the plunger;

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

[0014] Buffer layer is arranged on the outer contour wall of the driven wheel and / or the outer contour wall of the eccentric wheel;

[0015] The buffer layer includes buffer pad layer and steel ring cover;The steel ring cover is arranged on the outer peripheral wall of the buffer pad layer.

[0016] Further, the buffer pad layer includes rubber layer, silica gel layer or polyurethane layer.

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

[0018] Further, the end of the driving shaft close to the eccentric wheel is connected with connecting plate, the middle part of the connecting plate is provided with mounting groove, 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] Further, the two connecting pipes are axially parallel to the driving shaft.

[0021] The guide rod is slidably arranged in the two connecting pipes, and the two ends of the guide rod are fixedly installed on the shell.

[0022] Further, the spacing between the two connecting plates is adjustable.

[0023] In a second aspect, the utility model still provides a kind of plunger pump, including n groups as the plunger pump monomer of first aspect, n groups The plunger pump monomer is sequentially combined along the axial direction of main shaft;The main shaft of n group The plunger pump monomer is coaxial, integrally arranged, n≥2, n is integer.

[0024] Further, the eccentric wheels in the n groups of plunger pump monomers are sequentially misaligned in the preset direction, and the misalignment angle between the eccentric wheels in the adjacent two plunger pump monomers is 360° / n.

[0025] Further, it further includes two liquid force end assemblies arranged opposite on the two sides of the shell, and the water outlets of the two liquid force end assemblies are connected by a drain pipe.

[0026] The drain pipe is a straight pipe, and a water outlet is arranged at the middle position of the drain pipe, and the two ends of the drain pipe are connected with the water outlets of the two liquid force end assemblies, respectively.

[0027] The utility model has the beneficial effects of:

[0028] 1. The plunger pump provided by the utility model is provided with a buffer layer on the driven wheel and / or the eccentric wheel, which buffers the impact on the driven wheel generated in the rotation process of the eccentric wheel, reduces the impact noise, reduces the impact on the main shaft, thereby reducing the radial stress abrasion of the main shaft bearing and prolonging the service life of the main shaft bearing.

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

[0030] 3. The n eccentric wheels inside the plunger pump provided by the utility model are coaxial and sequentially misaligned in the preset direction, and the misalignment angle between the eccentric wheels in the adjacent two plunger pump monomers is 360° / n, so that the n eccentric wheels are distributed on the circumference of 360° in a uniform manner. In the process of driving the eccentric wheel to rotate by the main shaft, the resultant force of the force of the n eccentric wheels on the main shaft is minimum, thereby reducing the radial stress abrasion of the main shaft bearing and prolonging the service life of the main shaft bearing.

[0031] 4. The plunger pump provided by the utility model is connected by a drain pipe between the water outlets of the two liquid force end assemblies, the drain pipe is a straight pipe, the two ends of the drain pipe are connected with the water outlets of the two liquid force end assemblies, respectively, a water outlet is arranged at the middle position of the drain pipe, and the vibration problem caused by the flow pulsation phenomenon in the operation process of the existing reciprocating plunger pump is greatly alleviated by using the fluid impact principle. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The structure diagram of the plunger pump provided by the utility model embodiment is shown.

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

[0034] Figure 3 A schematic diagram showing the reference state between the eccentric wheel and the two driven wheels during rotation, provided for an embodiment of this utility model;

[0035] Figure 4 A schematic diagram of the structure of the buffer layer provided in an embodiment of this utility model;

[0036] Figure 5 A schematic diagram illustrating the resultant force generated on the driven wheel on the right side during the rotation of the eccentric wheel, as provided in an embodiment of this utility model.

[0037] Figure 6 This is a schematic diagram of the connection structure between the connecting plate and the connecting pipe provided in an embodiment of the present utility model.

[0038] In the attached diagram, the components are: housing 1, plunger 2, eccentric wheel 3, main shaft 4, drive shaft 5, driven wheel 6, outlet 7, buffer pad 8, steel ring sleeve 9, connecting plate 10, mounting groove 11, connecting pipe 12, guide rod 13, hydraulic end assembly 14, drain pipe 15, outlet 16, buffer layer 17, main shaft bearing 18, connecting part 19, limiting convex ring 20, gasket 21, and bearing 22. Detailed Implementation

[0039] The specific embodiments of this utility model will now be described in more detail with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0040] like Figure 1 As shown in the schematic diagram, this embodiment of the present invention provides a plunger pump, comprising n groups of plunger pump units arranged sequentially along the main shaft 4, wherein n ≥ 2, and n is an integer. In actual implementation, the plunger pump can generally be configured with 3, 4, or 5 groups. It should be noted that this embodiment does not impose a specific limitation on the number of groups of plunger pump units included in the plunger pump.

[0041] like Figure 2As shown, the plunger pump unit in the embodiment comprises a housing 1, two plungers 2 movably arranged in the housing 1, and a driving member for simultaneously driving the two plungers 2 to make linear reciprocating motion. 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 make linear reciprocating motion. One end of each 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 with the plunger 2. The driving shaft 5 is slidably arranged in a slide way in the housing 1, and can slide along the axial direction of the slide way through a linear bearing. The driving shaft 5 and the linear bearing can be lubricated by lubricating oil, which can reduce the friction coefficient and reduce 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 leakage of the lubricating oil.

[0042] The eccentric wheel 3 is arranged between the 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 make reciprocating motion along the axial direction of the slide way through the driven wheel 6, thereby driving the plunger 2 to reciprocate. It can be understood that, as shown in the figure, Figure 3 When the eccentric wheel 3 rotates, it will only contact one of the driven wheels 6 during the process of reversing between the maximum eccentricity and the minimum eccentricity.

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

[0044] In the embodiment, as shown in the figure, Figure 2 The two driving shafts 5 are each connected with a connecting plate 10 near the eccentric wheel 3, and the connecting plate 10 is provided with a mounting groove 11 in the middle. The driven wheel 6 is rotatably mounted in the mounting groove 11 through an axle. The upper and lower ends of the two connecting plates 10 are respectively fixedly connected through two connecting pipes 12, so as to keep the spacing between the two connecting plates 10 fixed, and the spacing size between the outer contours of the two driven wheels 6 can be kept fixed.

[0045] It can be understood that, for example, when Figure 2As shown in the process of the eccentric wheel 3 rotating in the direction of the arrow, the eccentric wheel 3 will be out of contact with the left driven wheel 6 and continue to drive the right driven wheel 6 to move right. In actual work, during the rotation of the eccentric wheel 3, it is possible that due to the close fit between the eccentric wheel 3 and the right driven wheel 6, impact noise is generated, and the main shaft 4 is subjected to unilateral impact, and the radial force of the main shaft bearing 18 carrying the rotation of the main shaft 4 is worn, greatly reducing the service life of the main shaft 4 and the main shaft bearing 18. Similarly, the same impact phenomenon may occur during the process of the eccentric wheel 3 driving the left driven wheel 6 to move left.

[0046] To solve this problem, in one possible implementation, a buffer layer 17 can be provided on the outer contour wall of the driven wheel 6, or in another possible implementation, a buffer layer 17 can be provided on the outer contour wall of the eccentric wheel 3, or in yet another possible implementation, a buffer layer 17 can be provided on the outer contour wall of the driven wheel 6 and the outer contour wall of the eccentric wheel 3, so that when the driven wheel 6 and the eccentric wheel 3 contact, the buffer layer 17 can be used for buffering.

[0047] Specifically, as shown in Figure 4 , the buffer layer 17 includes a buffer pad layer 8 and a steel ring sleeve 9, the buffer pad 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 pad layer 8. The steel ring sleeve 9 is used to improve the wear resistance of the entire driven wheel 6 or eccentric wheel 3. The driven wheel 6 is provided with a bearing 22, and the driven wheel 6 is rotatably installed on the shaft of the installation groove 11 through the bearing 22. The eccentric wheel 3 can be integrally formed with the main shaft 4.

[0048] In actual implementation, for the convenience of production and assembly, only the buffer layer 17 can be arranged on the outer contour wall of the driven wheel 6, as shown in Figure 2 .

[0049] Specifically, the buffer pad layer 8 can be a rubber layer, a silica gel layer or a polyurethane layer. The buffer pad layer 8 buffers the impact generated by the eccentric wheel 3 on the driven wheel 6 during rotation, thereby reducing the impact on the main shaft 4, reducing the radial force wear of the main shaft bearing 18, prolonging the service life of the main shaft 4 and the main shaft bearing 18, and effectively reducing the impact noise, which is reduced by about twice.

[0050] In this embodiment, the two connecting pipes 12 are axially parallel to the drive shaft 5. The two connecting pipes 12 are slidably provided with guide rods 13, and the two ends of the guide rods 13 are fixedly installed on the shell 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, whenFigure 2 When the eccentric wheel 3 in the eccentric wheel 3 clockwise rotates upward, the eccentric wheel 3 will generate a resultant force F on the right driven wheel 6 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 to get the vertical downward component F1 and the horizontal right component F2. The component F2 is used to push the right drive shaft 5 to move along its axial direction to the right, but the component F1 will also be transmitted to the right drive shaft 5. After a long time of work, the component F1 will cause the right drive shaft 5 to bend, resulting in that the movement of the drive shaft 5 cannot meet the linear requirement, and increasing the wear between the drive shaft 5 and the linear bearing. Figure 5 Similarly, when the eccentric wheel 3 in the eccentric wheel 3 continues to rotate clockwise more than 180°, the eccentric wheel 3 will generate a vertical upward component and a horizontal left component on the left driven wheel 6. The horizontal left component pushes the left drive shaft 5 to move along its axial direction to the left, and the vertical upward component is also transmitted to the left drive shaft 5.

[0052] Similarly, when the eccentric wheel 3 in the eccentric wheel 3 continues to rotate clockwise more than 180°, the eccentric wheel 3 will generate a vertical upward component and a horizontal left component on the left driven wheel 6. The horizontal left component pushes the left drive shaft 5 to move along its axial direction to the left, and the vertical upward component is also transmitted to the left drive shaft 5. Figure 2 In the embodiment, two upper and lower opposite guide rods 13 are arranged in parallel, which can bear the vertical downward component F1 or the vertical upward component, reduce the radial load of the drive shaft 5, and prolong the service life of the drive shaft 5. At the same time, the two connecting pipes 12 can only slide along the guide rods 13 in the axial direction, so that the linear requirement of the reciprocating movement of the drive shaft 5 is met, and the reliability of the linear movement of the drive shaft 5 is improved.

[0053] It can be understood that although the eccentric wheel 3 and the driven wheel 6 can also be lubricated by lubricating oil, after a long time of work, a certain wear will occur between the outer contour of the eccentric wheel 3 and the steel ring sleeve 9 of the driven wheel 6, so that the spacing size between the outer contours of the two driven wheels 6 is greater than the diameter size of the eccentric wheel 3, and 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.

[0054] In order to improve this situation, in the embodiment, the spacing between the two connecting plates 10 is adjustable, so that the spacing size between the outer contours of the two driven wheels 6 can be adjusted to be equal to the diameter size of the eccentric wheel 3. Specifically, as shown in the figure, the end of the connecting plate 10 is provided with a connecting portion 19, the connecting portion 19 is sleeved on the connecting pipe 12, the end of the connecting pipe 12 is provided with a limiting convex ring 20, a plurality of gaskets 21 with a predetermined thickness are arranged between the connecting portion 19 and the limiting convex ring 20, and the connecting portion 19 and the limiting convex ring 20 are fixedly connected through bolts.

[0055] Figure 6

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

[0057] In this embodiment, the main shafts 4 of the n groups of plunger pump units are coaxial and integrally arranged, that is, all the eccentric wheels 3 of the plunger pump units are mounted 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 with an external power device, and the main shaft 4 is driven to rotate by the external power device, so that all the eccentric wheels 3 on the main shaft 4 can rotate at the same time.

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

[0059] The n eccentric wheels 3 are coaxial and sequentially arranged in a preset direction, and the included angle between the eccentric wheels in adjacent two plunger pump units is 360° / n, so that the n eccentric wheels are distributed on the circumference of 360° in a uniform manner. In this way, in the process of driving the eccentric wheels 3 to rotate by the main shaft 4, the resultant force of the forces acting on the main shaft 4 by the n eccentric wheels 3 is the smallest, thereby greatly reducing the radial force wear of the main shaft bearing 18 and prolonging the service life of the main shaft bearing 18.

[0060] In this embodiment, as shown in Figure 2 The plunger pump also includes two liquid end assemblies 14 arranged opposite to each other on the two sides of the housing 1, and the liquid end assembly 14 can be a conventional liquid end assembly for plunger pump. During use, the plunger pump may have a flow pulsation phenomenon, which refers to a sharp change in the water flow at the water outlet 7 of the liquid end assembly 14 within a short period of time, and is manifested as a periodic change in the water outlet pressure of the liquid end assembly 14. This phenomenon can cause the performance and stability of the plunger pump to decrease, and adversely affect the production process.

[0061] The hydraulic end assembly 14 has a one-way valve inside both the inlet 16 and the outlet 7. The inlet one-way valve is a suction valve, which can only draw liquid into the hydraulic end assembly 14 and cannot discharge it. The outlet one-way valve is a discharge valve, which can only discharge liquid out of the hydraulic end assembly 14 and cannot draw liquid in. Figure 2 As shown, when the left plunger 2 moves to the right, the pressure inside the cylinder of the left hydraulic end assembly decreases, the suction valve opens, and liquid is drawn into the hydraulic end assembly. When the left plunger 2 moves to the left, the pressure inside the cylinder of the hydraulic end assembly 4 increases, the suction valve closes, the discharge valve opens, and liquid is forced out. Because the plunger 2 reciprocates, the inlet and outlet pressures of the hydraulic end assembly 4 are unstable, resulting in pulsation. Furthermore, reciprocating motion itself is non-uniform, changing direction through a point of zero velocity. The velocity is not the same at different points in the plunger 2's movement, and the instantaneous flow rates of the discharged or drawn liquid are unequal. Therefore, its output characteristics are non-uniform and exhibit periodic changes. This is the reason for the flow pulsation in the reciprocating plunger pump.

[0062] To mitigate flow pulsation that may occur during the operation of the plunger pump, in this embodiment, such as 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 provided in the middle of the drain pipe 15. The two ends of the drain pipe 15 are respectively connected to the water outlets of the two hydraulic end assemblies 14.

[0063] Water discharged from the outlets of the two hydraulic end assemblies 14 moves from both ends of the drain pipe 15 to the outlet 16 in the middle of the drain pipe 15. Since the outlet 16 is located in the middle of the drain pipe 15, the water discharged from the outlets of the two hydraulic end assemblies 14 travels the same distance to the outlet 16, where it counter-currents, and then is discharged outward from the outlet 16. The principle of fluid counter-current can greatly alleviate the vibration problem caused by flow pulsation during the operation of existing reciprocating plunger pumps.

[0064] In summary, the plunger pump provided in this application has a buffer layer on the driven wheel and / or eccentric wheel. The buffer layer buffers the impact on the driven wheel during the rotation of the eccentric wheel, reduces impact noise, and reduces the impact on the main shaft, thereby reducing the radial wear of the main shaft bearing and extending the service life of the main shaft bearing.

[0065] Meanwhile, the plunger pump provided in this 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] And, the plunger pump provided by the application is characterized in that n eccentric wheels in the plunger pump are coaxial and sequentially arranged in a staggered manner along a preset direction, the staggered angle between the eccentric wheels in two adjacent plunger pump units is 360° / n, the n eccentric wheels are distributed on a 360° circumference in a uniform manner, and thus the resultant force of the force of the n eccentric wheels on the main shaft is minimum during the rotation of the main shaft driven by the eccentric wheels, thereby reducing the radial force abrasion of the main shaft bearing and prolonging the service life of the main shaft bearing.

[0067] Finally, the plunger pump provided by the application is characterized in that the plunger pump is connected through a drain pipe between the water outlet holes of two fluid end assemblies, the drain pipe is a straight pipe, the two ends of the drain pipe are connected with the water outlet holes of the two fluid end assemblies respectively, and a water outlet is arranged at the middle position of the drain pipe, thereby greatly relieving the vibration problem caused by the flow pulsation phenomenon during the operation of the existing reciprocating plunger pump by using the fluid impact principle.

[0068] The above is only the preferred embodiment of the utility model, and does not limit the utility model. Any person skilled in the art can make equivalent replacement, modification or change of the technical scheme and technical content disclosed by the utility model without departing from the technical scheme of the utility model, and the modified utility model still falls within the protection scope of the utility model.

Claims

1. A piston pump unit, characterized in that include: Shell (1); Two plungers (2) are movably disposed within the housing (1); as well as, A driving component that simultaneously drives the two plungers (2) to perform linear reciprocating motion; wherein, The driving component includes an eccentric wheel (3), a main shaft (4) for driving the eccentric wheel (3) to rotate, and two drive shafts (5) for driving the two plungers (2) to perform linear reciprocating motion respectively. The drive shafts (5) are slidably disposed in the slide rails inside the housing (1). One end of the drive shaft (5) contacts 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 positioned 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); The buffer layer (17) includes a buffer pad layer (8) and a steel ring sleeve (9); the steel ring sleeve (9) is disposed on the outer peripheral wall of the buffer pad layer (8).

2. A piston pump unit according to claim 1, characterized in that The cushioning layer (8) includes a rubber layer, a silicone layer, or a polyurethane layer.

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

4. A piston pump unit as claimed in claim 1, characterized in that A connecting plate (10) is connected to one end of the drive shaft (5) near 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 installed in the mounting groove (11). The upper and lower ends of the two connecting plates (10) are fixedly connected by two connecting pipes (12).

5. A piston pump unit as claimed in claim 4, characterized in that Both connecting pipes (12) are arranged axially parallel to the drive shaft (5); Guide rods (13) are slidably installed inside both of the two connecting pipes (12), and the two ends of the guide rods (13) are respectively fixedly installed on the housing (1).

6. A piston pump unit as claimed in claim 5, characterized in that The spacing between the two connecting plates (10) is adjustable.

7. A piston pump characterized in that It includes n groups of plunger pump units as described in any one of claims 1-6, the n groups of plunger pump units are arranged in sequence along the axial direction of the main shaft (4); the main shaft (4) of the n groups of plunger pump units is coaxial and integrally arranged, n≥2, and n is an integer.

8. A piston pump as claimed in claim 7, characterized in that The eccentric wheels (3) in the n-group plunger pump units are staggered in sequence along a preset direction, and the staggered angle between two adjacent eccentric wheels (3) in the plunger pump units is 360° / n.

9. A piston pump as claimed in claim 7, characterized in that It also includes two hydraulic end assemblies (14) located opposite each other on both sides of the housing (1), and 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 an outlet (16) is provided in the middle of the drain pipe (15). The two ends of the drain pipe (15) are respectively connected to the outlet holes of the two hydraulic end assemblies (14).

Images