Improved reciprocating pump

Abstract

The application relates to the technical field of volume pumps, in particular to an improved reciprocating pump which comprises a power unit and a hydraulic unit; the improved reciprocating pump further comprises a compensation unit which is arranged on the hydraulic unit and is used for compensating the liquid suction effect of a far-end cylinder, the compensation unit comprises a compensation frame arranged below the hydraulic unit, a plurality of compensation cylinders are mounted on the upper end of the compensation frame and are in communication, a pushing part is arranged in the compensation cylinder, and a feeding head is mounted on the end of the compensation frame. The compensation unit adopted by the application cooperates with the driving unit, can effectively fill the viscous medium into the plurality of cylinders of the hydraulic unit, avoids the phenomena of multiple-cylinder liquid stealing, suction flow deviation and far-end cylinder cavitation during the use of the reciprocating pump, avoids the damage of core components such as pump cylinders and piston rods, ensures the uniformity of the liquid suction of the reciprocating pump, and greatly prolongs the service life of the core vulnerable components.

Description

Technical Field

[0001] This invention relates to the field of positive displacement pump technology, and in particular to an improved reciprocating pump. Background Technology

[0002] Reciprocating pumps, as the core category of positive displacement pumps, are widely used in industrial fields such as agricultural machinery, small-scale chemical batching, and mining due to their advantages of stable flow and strong pressure adaptability.

[0003] Reciprocating pumps are key equipment for the precise delivery of high-viscosity liquids, slurries, resins, and other media. Currently, due to limitations such as installation space, media metering requirements, and operational safety, reciprocating pumps with single-end branch series inlet are the only option for media delivery in scenarios such as slurry delivery in narrow underground mine tunnels and straw saccharification liquid delivery in agricultural machinery. When delivering viscous media, due to their high viscosity and high flow resistance, existing reciprocating pumps exhibit a distinct pressure distribution pattern: the pressure in the near-end cylinders is higher than that in the far-end cylinders. The near-end cylinders can quickly complete the liquid suction action, while the far-end cylinders experience slower flow due to the longer pipeline length. If the suction pressure is consistently insufficient, multiple cylinders are prone to competing for liquid. When the distal cylinder cannot obtain sufficient viscous medium filling during the suction stroke, a local negative pressure will form inside the cylinder, which will lead to cavitation. This cavitation will not only cause cylinder seal failure and medium leakage, but also damage the piston rod and pump cylinder, reducing service life. Furthermore, during the suction process, when the piston rod of the pump cylinder reciprocates in the compensation cylinder, especially under high flow rate conditions, the viscous medium in the compensation cylinder is prone to being unable to be pushed to the pump cylinder in time due to its high viscosity and poor fluidity, resulting in insufficient liquid suction in the pump cylinder and a significant reduction in delivery volume and efficiency.

[0004] Therefore, there is an urgent need to provide an improved reciprocating pump that can ensure the effective suction of viscous media and assist in the suction of viscous media. Summary of the Invention

[0005] Therefore, it is necessary to provide an improved reciprocating pump to solve the technical problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention employs the following technical solution: an improved reciprocating pump, comprising: a power unit and a hydraulic unit.

[0007] The improved reciprocating pump also includes a compensation unit, which is set on the hydraulic unit and used to compensate for the liquid suction effect of the distal cylinder. The compensation unit includes a compensation frame set below the hydraulic unit, with multiple compensation cylinders installed and connected to the upper end of the compensation frame. A pushing part is set inside the compensation cylinder, and a feed head is installed and connected to the end of the compensation frame.

[0008] The improved reciprocating pump also includes a drive unit, which is located at the lower end of the compensation frame and is used to push multiple pushing parts in sequence. The drive unit includes a connecting frame that is detachably connected to the lower end of the compensation frame, and the drive part is arranged inside the connecting frame.

[0009] The pushing part includes a sealing sleeve disposed inside the compensation cylinder. Multiple circumferentially evenly distributed connecting rods are installed on the inner annular surface of the sealing sleeve. A pushing rod is installed on the inner end of the multiple connecting rods. A sliding groove is opened at the upper end of the pushing rod, and a pushing component is slidably connected in the sliding groove.

[0010] The power unit and drive unit work together. The drive unit sequentially drives multiple push rods and coordinates with the working states of multiple cylinders in the hydraulic unit. When the cylinder of the hydraulic unit draws in viscous media, the drive unit drives the push rods and pushers to push the viscous media into the corresponding cylinder, so that the cylinder is fully filled with viscous media. At the same time, the pushers push and assist the hydraulic unit in drawing in viscous media. When the drive unit drives the push rods to reset, the viscous media pushes open the pushers and moves to the pushers through the gap between the push rods and the sealing sleeve, which facilitates the compensation of the next viscous media.

[0011] Preferably, the compensation unit further includes multiple circumferentially evenly distributed pressing portions for pressing down the push plate.

[0012] Preferably, the pressing part includes a rotating through hole opened on the cylinder wall of the compensation cylinder, a limiting frame fixedly connected to the outer surface of the cylinder wall of the compensation cylinder is provided at the rotating through hole, a pressing member is hinged in the rotating through hole, and a torsion spring is provided at the hinge of the pressing member.

[0013] Preferably, the pressing member is composed of an arc-shaped rod and a strip-shaped rod, and the strip-shaped rod segment of the pressing member is hinged to the rotating through hole.

[0014] Preferably, the pusher includes a sliding rod slidably connected in the sliding groove, and a push plate for sealing the gap between the push rod and the sealing sleeve is installed at the upper end of the sliding rod.

[0015] Preferably, the bottom wall of the compensation frame is inclined and tilted towards the distal cylinder of the hydraulic unit.

[0016] Preferably, a plurality of guide tubes are installed at the lower end of the bottom wall of the compensation frame, and the plurality of guide tubes are respectively sleeved on a plurality of push rods.

[0017] Preferably, a funnel-shaped feeding cone plate is fitted onto the outer surface of the push rod, and the feeding cone plate is located inside the compensation frame with its opening facing upward.

[0018] Preferably, the structure of the drive unit is the same as that of the power unit.

[0019] In summary, the present invention has the following beneficial technical effects: 1. The compensation unit and drive unit used in the present invention can effectively fill the viscous medium into multiple cylinders of the hydraulic unit, avoiding the phenomena of multiple cylinders competing for liquid, suction flow deviation, and cavitation in the far cylinder that occur when the reciprocating pump is used, and avoiding damage to core components such as pump cylinder and piston rod. This not only ensures the uniformity of liquid suction of the reciprocating pump, but also greatly extends the service life of core vulnerable components.

[0020] 2. The compensation unit and drive unit used in this invention can work together to actively assist the hydraulic unit in completing the absorption of viscous media, effectively reducing the liquid absorption resistance of viscous media and comprehensively improving the absorption and transportation efficiency of viscous media; moreover, the amount of media compensated by the compensation unit each time is uniform, controllable and replenished in real time, which can be adapted to the large conveying capacity of reciprocating pumps and has high applicability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown.

[0023] Figure 2 A front view of the present invention is shown.

[0024] Figure 3 A left view of the present invention is shown.

[0025] Figure 4 It shows Figure 2 Sectional view of AA.

[0026] Figure 5 It shows Figure 4 A magnified view of region C in the middle.

[0027] Figure 6 It shows Figure 3 A cross-sectional view of BB.

[0028] Figure 7 A schematic diagram of the compensation unit and driving unit of the present invention is shown.

[0029] The above-mentioned figures include the following reference numerals: 1. Power unit; 2. Hydraulic unit; 3. Compensation unit; 30. Compensation frame; 31. Compensation cylinder; 32. Pushing part; 320. Sealing sleeve; 321. Push rod; 322. Sliding rod; 323. Top push plate; 324. Feed cone plate; 33. Feed head; 34. Pressing part; 340. Rotating through hole; 341. Limiting frame; 342. Pressing component; 35. Guide tube; 4. Drive unit; 40. Connecting frame; 41. Drive part. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways not described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] See Figures 1-3 An improved reciprocating pump includes a power unit 1 and a hydraulic unit 2. The power unit 1 consists of a frame fixed in the working position, a crankshaft rotatably connected to the frame, and a crosshead connected to the crankshaft via a connecting rod. The hydraulic unit 2 consists of a pump cylinder that provides a sealed working chamber for liquid compression and delivery, a piston rod that reciprocates linearly within the cylinder to change the working volume, an intake valve and an exhaust valve that control the unidirectional flow of liquid and prevent backflow, a piston rod connected to the crosshead, a sealing device that prevents liquid leakage from the gap between the piston rod and the pump cylinder, a mechanically sealed cylinder head that seals the end of the pump cylinder, and an intake pipe and an exhaust pipe that respectively deliver the intake liquid and the exhaust high-pressure liquid. Both the power unit 1 and the hydraulic unit 2 are existing technologies.

[0032] In actual operation, power unit 1 and hydraulic unit 2 are installed in the working position. Then, power unit 1 is connected to the existing motor drive through a coupling. The existing motor is connected to the existing control system through an electrical signal. Then, the existing inlet pipe is connected to the suction pipe, and the existing outlet pipe is connected to the discharge pipe. The end of the inlet pipe is placed into the viscous medium to be sucked.

[0033] See Figure 1 , Figure 4 , Figure 6 and Figure 7The improved reciprocating pump also includes a compensation unit 3 installed on the hydraulic unit 2 and used to compensate for the liquid suction effect of the distal cylinder. The compensation unit 3 includes a compensation frame 30 installed below the hydraulic unit 2. The bottom wall of the compensation frame 30 is inclined and tilted towards the distal cylinder of the hydraulic unit 2. Multiple compensation cylinders 31 are installed and connected to the upper end of the compensation frame 30. All multiple compensation cylinders 31 are connected to the pump cylinder. A feed head 33 is installed and connected to the end of the compensation frame 30.

[0034] See Figure 1 , Figure 4 , Figure 6 and Figure 7 The improved reciprocating pump also includes a drive unit 4 disposed at the lower end of the compensation frame 30 and used to sequentially push multiple pushing parts 32. The drive unit 4 includes a connecting frame 40 detachably connected to the lower end of the compensation frame 30. A drive part 41 is disposed inside the connecting frame 40. The structure of the drive part 41 is the same as that of the power unit 1.

[0035] In actual operation, the connecting frame 40 is fixedly connected to the compensation frame 30 with bolts. Then, the drive unit 41 is connected to the existing motor drive through a coupling. The existing motor is connected to the existing control system through an electrical signal. Then, another existing liquid inlet pipe is fixedly connected to the feed head 33 and connected. The end of the other existing liquid inlet pipe is simultaneously placed into the solution to be drawn. The compensation frame 30 and multiple compensation cylinders 31 are filled with viscous medium by an external existing pump. The compensation frame 30 and the connecting frame 40 are small in size and can be used in places with small working space without the need to add a larger liquid collection frame.

[0036] When drawing in viscous liquid, the control system controls two motors to work simultaneously. The two motors drive the power unit 1 and the drive unit 41 to work simultaneously. The power unit 1 and the drive unit 41 work together in phase. The rotating crankshaft drives the crosshead to move back and forth through the connecting rod. The crosshead drives the piston rod to move back and forth in the pump cylinder, thereby drawing the viscous medium into and out of the pump cylinder.

[0037] The drive unit 41 sequentially drives multiple pushing units 32, which are coordinated with the working state of multiple cylinders of the hydraulic unit 2. When the cylinder of the hydraulic unit 2 draws in viscous media, the drive unit 41 drives multiple pushing units 32 to push the viscous media into the corresponding cylinder, so that multiple cylinders are fully filled with viscous media, thereby compensating for the remote cylinder of the hydraulic unit 2. At the same time, the pusher assists the hydraulic unit 2 in drawing in viscous media, effectively avoiding the phenomenon of multiple cylinders competing for liquid, suction flow deviation, and cavitation in the remote cylinder. This avoids damage to core components such as pump cylinders and piston rods, ensuring the uniformity and efficiency of liquid suction of the reciprocating pump, and significantly extending the service life of core vulnerable components.

[0038] See Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The compensation cylinder 31 is provided with a pushing part 32. The pushing part 32 includes a sealing sleeve 320 provided in the compensation cylinder 31. Multiple circumferentially evenly distributed connecting rods are installed on the inner ring surface of the sealing sleeve 320. The inner ends of the multiple connecting rods are jointly installed with a pushing rod 321. The lower end of the pushing rod 321 slides through the bottom wall of the compensation frame 30 and is fixedly connected to the driving part 41. A sealing ring is provided between the pushing rod 321 and the bottom wall of the compensation frame 30. A sliding groove is opened at the upper end of the pushing rod 321, and a pushing component is slidably connected in the sliding groove.

[0039] See Figures 4-7 The pusher includes a sliding rod 322 slidably connected in the sliding groove. A push plate 323 for sealing the gap between the push rod 321 and the sealing sleeve 320 is installed at the upper end of the sliding rod 322. A sealing ring is provided at the lower end of the push plate 323. A funnel-shaped feeding cone plate 324 is sleeved on the outer surface of the push rod 321. The feeding cone plate 324 is located inside the compensation frame 30 and its opening faces upward.

[0040] See Figures 6-7 The lower end of the bottom wall of the compensation frame 30 is equipped with multiple guide tubes 35, which are respectively sleeved on multiple push rods 321.

[0041] In actual operation, the drive unit 41 sequentially drives multiple push rods 321 to reciprocate. The guide tube 35 guides the crosshead in the drive unit 41. When the pump cylinder draws in the viscous medium, the push rods 321 drive the push plate 323 to move upward in the compensation cylinder 31 through the sliding rod 322. The push plate 323 and the upper end of the sealing sleeve 320 form a complete plane, pushing the viscous medium in the compensation cylinder 31 into the corresponding cylinder body. At the same time, the push plate 323 and the sealing sleeve 320 push the viscous medium, which can assist the hydraulic unit 2 in drawing in the viscous medium and ensure the pump cylinder's drawing effect on the viscous medium. As the push rods 321 move upward, they also drive the feeding cone plate 324 to move upward. The feeding cone plate 324 pushes the viscous medium in the compensation frame 30... When the viscous medium is pushed into the compensation cylinder 31, the sealing plane formed by the push plate 323 and the upper end of the sealing sleeve 320 moves upward, which can also draw the viscous medium in the compensation frame 30 into the compensation cylinder 31. The two work together to fill the compensation cylinder 31 with viscous medium in real time during the process of the viscous medium entering the pump cylinder, thus avoiding the phenomenon of gas in the compensation cylinder 31. When the viscous medium fills the compensation cylinder 31, the compensation frame 30 draws the viscous medium through the feed head 33 and the liquid inlet pipe, thereby filling the compensation frame 30. The bottom wall of the compensation frame 30 is inclined, which makes it easy for the viscous medium to quickly fill to the bottom of the hydraulic unit 2 remote cylinder, thus avoiding the phenomenon of gaps in the compensation frame 30.

[0042] See Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The compensation unit 3 further includes multiple circumferentially evenly distributed pressing parts 34 for pressing down the push plate 323. The pressing part 34 includes a rotating through hole 340 opened on the cylinder wall of the compensation cylinder 31. A limiting frame 341 fixedly connected to the outer surface of the cylinder wall of the compensation cylinder 31 is provided at the rotating through hole 340. A pressing member 342 is hinged in the rotating through hole 340. A torsion spring is provided at the hinge of the pressing member 342. The pressing member 342 is composed of an arc-shaped rod and a strip-shaped rod. The strip-shaped rod segment of the pressing member 342 is hinged to the rotating through hole 340.

[0043] In actual operation, in the initial state, the sealing sleeve 320 limits the multiple pressing parts 342. The pressing parts 342 are located in the corresponding rotating through holes 340 and limiting frames 341. The torsion springs at the hinges of the pressing parts 342 are in an energy-storing state. When the drive unit 41 drives the push rod 321 to reset, the push rod 321 drives the push plate 323 to move downward through the sliding rod 322. The viscous medium blocks the push plate 323, thereby separating the push plate 323 from the sealing sleeve 320. The viscous medium moves through the gap between the push rod 321 and the sealing sleeve 320 to the top of the push plate 323, so that the push plate 323 can push the viscous medium into the pump cylinder next time. After the sealing sleeve 320 is reset downwards to below the pressing member 342, the stored torsion spring releases energy and drives the pressing member 342 to rotate. The arc-shaped rods of the multiple pressing members 342 rotate to the upper end of the push plate 323 and press the push plate 323 to the upper end of the sealing sleeve 320, and re-close the gap between the sealing push rod 321 and the sealing sleeve 320, thereby ensuring the compensation amount of the viscous medium afterward. At the same time, it is suitable for the large transmission capacity of the reciprocating pump, that is, the high speed state of the power unit 1 and the drive unit 41. When compensating for the viscous medium again, the sealing sleeve 320 pushes the pressing member 342 back into the rotating through hole 340 and the limiting frame 341, releasing the limitation on the push plate 323.

[0044] The compensation unit 3 continuously compensates the hydraulic unit 2 until all the viscous medium to be absorbed is absorbed, at which point the operation ends.

[0045] In the description of the embodiments of the present invention, it should be noted that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An improved reciprocating pump, comprising a power unit and a hydraulic unit, characterized in that, Also includes: A compensation unit is installed on the hydraulic unit and is used to compensate for the liquid suction effect of the distal cylinder. The compensation unit includes a compensation frame installed below the hydraulic unit, multiple compensation cylinders are installed and connected to the upper end of the compensation frame, a pushing part is provided inside the compensation cylinder, and a feed head is installed and connected to the end of the compensation frame. A drive unit is disposed at the lower end of the compensation frame and is used to sequentially push multiple pushing parts. The drive unit includes a connecting frame that is detachably connected to the lower end of the compensation frame, and a drive part is disposed inside the connecting frame. The pushing part includes a sealing sleeve disposed in the compensation cylinder. Multiple circumferentially evenly distributed connecting rods are installed on the inner ring surface of the sealing sleeve. A pushing rod is installed on the inner end of the multiple connecting rods. A sliding groove is opened at the upper end of the pushing rod. A pushing component is slidably connected in the sliding groove. The compensation unit also includes multiple circumferentially evenly distributed pressing parts for pressing down the push plate; The pressing part includes a rotating through hole opened on the cylinder wall of the compensation cylinder, a limiting frame fixedly connected to the outer surface of the cylinder wall of the compensation cylinder is provided at the rotating through hole, a pressing member is hinged in the rotating through hole, and a torsion spring is provided at the hinge of the pressing member. The pressing component is composed of an arc-shaped rod and a strip-shaped rod, and the strip-shaped rod segment of the pressing component is hinged to the rotating through hole; The pusher includes a sliding rod slidably connected in the sliding groove, and a push plate for sealing the gap between the push rod and the sealing sleeve is installed at the upper end of the sliding rod; The power unit and the drive unit work together. The drive unit drives multiple push rods in sequence and coordinates with the working state of multiple cylinders of the hydraulic unit. When the cylinder of the hydraulic unit draws in viscous media, the drive unit drives the push rods and pushers to push the viscous media into the corresponding cylinder, so that the cylinder is fully filled with viscous media. At the same time, the pushers push and assist the hydraulic unit in drawing in viscous media.

2. An improved reciprocating pump according to claim 1, characterized in that: The bottom wall of the compensation frame is inclined and tilts towards the far end cylinder of the hydraulic unit.

3. An improved reciprocating pump according to claim 1, characterized in that: Multiple guide tubes are installed at the lower end of the bottom wall of the compensation frame, and the multiple guide tubes are respectively sleeved on multiple push rods.

4. An improved reciprocating pump according to claim 1, characterized in that: A funnel-shaped feeding cone plate is fitted onto the outer surface of the push rod. The feeding cone plate is located inside the compensation frame and its opening faces upward.

5. An improved reciprocating pump according to claim 1, characterized in that: The structure of the drive unit is the same as that of the power unit.

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