A continuous piston pump

Abstract

This invention relates to a continuous suction and discharge piston pump, which effectively solves the problem that existing single-cylinder piston pumps cannot achieve continuous suction and discharge. The technical solution includes an inlet pipe and an upper coaxial outlet pipe. A sleeve is coaxially fitted on the outside of both the inlet and outlet pipes. A plunger is installed inside the sleeve. The outer walls of the two plungers are in contact with and sealed to the inner wall of the sleeve. The two plungers are fixed to the ends of the inlet and outlet pipes, respectively. An outer cylinder is coaxially fitted on the outside of the two sleeves. Three pistons are arranged vertically inside the outer cylinder. The outer walls of the three pistons are in contact with and sealed to the inner wall of the outer cylinder. The middle piston is fixed to the inner wall of the outer cylinder. The upper and lower pistons are fixed to the ends of the upper and lower sleeves, respectively. When the outer cylinder moves upward, the two sleeves move downward simultaneously. When the outer cylinder moves downward, the two sleeves move upward simultaneously. One-way valves are provided on the two plungers and the three pistons. Multiple one-way valves ensure that fluid can only flow from the inlet pipe to the outlet pipe.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery, specifically a continuous pumping piston pump. Background Technology

[0002] Piston pumps are widely used in petrochemical, machinery manufacturing, papermaking, and food processing industries because they can pump liquids of various media and viscosities and have advantages such as simple structure, low maintenance cost, low noise, and long-term durability. However, piston pumps also have obvious drawbacks. Due to the characteristics of their working mode, the suction and pumping of a single-cylinder piston pump are intermittent, which means that the pipes connected to the piston pump before and after it have to withstand pulse pressure, and the seals at the pipe connections are prone to fatigue failure. Several solutions exist, such as dual-cylinder and multi-cylinder piston pumps. These solutions define a single-cylinder piston pump as a branch, connecting each branch in parallel to the main pipeline to achieve continuous suction and pumping. However, such devices are simply stacks of single-cylinder piston pumps; the better the effect, the more single-cylinder piston pumps are needed, multiplying the equipment's size. This makes them unsuitable for mobile installations. Furthermore, the connection points between the single-cylinder piston pumps in each branch and the pipelines on the front and rear sides are still subject to pulse pressure, making leakage likely. Other inventions, such as those with application numbers 201110399119.7 and 202010152498.9, achieve continuous pumping of a single-cylinder piston pump by adding a branch pipeline and connecting a buffer chamber at the pump outlet. These are smaller than dual-cylinder or multi-cylinder piston pumps, but their principle is simply to pump out the liquid inhaled once in two stages, without changing the pulse pressure at the piston pump's suction end. Therefore, a small-sized piston pump capable of continuous suction and pumping is still needed. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a continuous suction and discharge piston pump, which effectively solves the problem that the existing single-cylinder piston pump cannot achieve continuous suction and discharge.

[0004] The technical solution is a continuous pumping piston pump, including an inlet pipe, an outlet pipe coaxially arranged above the inlet pipe, and a sleeve coaxially fitted on the outer side of the inlet and outlet pipes at their respective ends. Each sleeve contains a plunger, the outer walls of which are fitted and sealed against the inner walls of the sleeves, and the two plungers are fixed to the ends of the inlet and outlet pipes respectively. An outer cylinder is coaxially fitted on the outer sides of the two sleeves, containing three pistons arranged vertically. The outer walls of the three pistons are fitted and sealed against the inner walls of the outer cylinder, with the middle piston fixed to the inner wall of the outer cylinder, and the upper and lower pistons fixed to the ends of the upper and lower sleeves respectively. When the outer cylinder moves upward, the two sleeves move downward simultaneously and synchronously; when the outer cylinder moves downward, the two sleeves move upward simultaneously and synchronously. Furthermore, one-way valves are provided on both plungers and three pistons, and multiple one-way valves ensure that the fluid can only flow from the inlet pipe to the outlet pipe.

[0005] An annular disc is fixed to both the inlet and outlet pipes on the outer side of the sleeve. Multiple fixed pulleys are fixed to the side of each disc closest to the sleeve. Multiple ropes are fixed to both the upper and lower ends of the outer cylinder. Each rope passes around a fixed pulley and is fixed to the sleeve on the same side. A washer is fixed to the inner wall of the end of each sleeve away from the piston. A compression spring is provided between each washer and the disc on the same side. The compression spring makes the two sleeves tend to move away from the disc. At the same time, the ropes and fixed pulleys make the outer cylinder and the two sleeves move in opposite directions.

[0006] The outer wall of the disc is threaded, and two cylindrical shells are provided on the outer side of the outer cylinder. Each shell has an internal thread at its outer end. The two shells can be fixed to the two discs by the threads respectively. The shells can protect the fixed pulley and rope. The rear side of the two shells is fixed to the base by bolts, and the base has multiple through holes to fix the base in a designated position.

[0007] The inlet and outlet pipes are both threaded at the ends outside the sleeve to facilitate connection with rigid pipes; or the ends of the inlet and outlet pipes outside the sleeve are pagoda-shaped connectors to facilitate connection with flexible pipes.

[0008] Multiple connecting rods symmetrical about the center of the outer cylinder axis are fixed on the outer side wall of the outer cylinder, which facilitates the connection of the outer cylinder to an external power hydraulic cylinder or motor to realize the up-and-down reciprocating motion of the outer cylinder.

[0009] The continuous pumping piston pump of this invention, through its coaxially designed tubular components, allows the outer cylinder to drive the upper and lower sleeves to move up and down. This causes the volume of the four chambers between the two plungers and the piston to continuously change. Combined with the one-way valves on the plungers and piston, it achieves continuous liquid pumping, solving the problem that existing single-cylinder piston pumps cannot continuously pump and discharge liquid. This invention not only achieves continuous liquid pumping with a small pump body but also significantly improves the working efficiency of the piston pump, demonstrating ingenious design. Attached Figure Description

[0010] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0012] Figure 1 This is the front view of the present invention.

[0013] Figure 2 This is a bottom view of the present invention.

[0014] Figure 3 This is a front cross-sectional view of the present invention.

[0015] Figure 4 This is a schematic diagram of the internal state of the pump body when the outer cylinder is centered.

[0016] Figure 5 This is a schematic diagram of the internal state of the pump body when the outer cylinder is at the bottom dead center.

[0017] Figure 6 This is a schematic diagram of the internal state of the pump body when the outer cylinder is at the top dead center.

[0018] In the diagram: 1. Inlet pipe; 2. Outlet pipe; 3. Sleeve; 4. Plunger; 5. Outer cylinder; 6. Piston; 7. Disc; 8. Fixed pulley; 9. Rope; 10. Washer; 11. Compression spring; 12. Housing; 13. Base; 14. Connecting rod. Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Depend on Figures 1 to 6 The present invention includes an inlet pipe 1, an outlet pipe 2 coaxially disposed above the inlet pipe 1, and a sleeve 3 coaxially fitted on the outer side of the inlet pipe 1 and the outlet pipe 2 at their respective close ends. Each sleeve 3 contains a plunger 4, the outer wall of the two plungers 4 being in contact with and sealed to the inner wall of the sleeve 3, and the two plungers 4 being fixed to the ends of the inlet pipe 1 and the outlet pipe 2, respectively. An outer cylinder 5 is coaxially fitted on the outer side of the two sleeves 3, and three pistons 6 arranged vertically are disposed inside the outer cylinder 5. The outer walls of the three pistons 6 are in contact with and sealed to the inner wall of the outer cylinder 5, the middle piston 6 being fixed to the inner wall of the outer cylinder 5, and the upper and lower pistons 6 being fixed to the ends of the upper and lower sleeves 3, respectively. When the outer cylinder 5 moves upward, the two sleeves 3 move downward simultaneously and synchronously; when the outer cylinder 5 moves downward, the two sleeves 3 move upward simultaneously and synchronously. Furthermore, the two plungers 4 and the three pistons 6 are all equipped with one-way valves, and the multiple one-way valves ensure that the fluid can only flow from the inlet pipe 1 to the outlet pipe 2.

[0021] An annular disc 7 is fixed on the inlet pipe 1 and outlet pipe 2 on the outer side of the sleeve 3. Multiple fixed pulleys 8 are fixed on the side of each disc 7 near the sleeve 3. Multiple ropes 9 are fixed at the upper and lower ends of the outer cylinder 5. Each rope 9 passes around the fixed pulley 8 and is fixed to the sleeve 3 on the same side. A washer 10 is fixed on the inner wall of the end of each sleeve 3 away from the piston 6. A compression spring 11 is provided between each washer 10 and the disc 7 on the same side. The compression spring 11 makes the two sleeves 3 always tend to move away from the disc 7. At the same time, the ropes 9 and fixed pulleys 8 make the outer cylinder 5 and the two sleeves 3 move in opposite directions.

[0022] The outer wall of the disc 7 is threaded, and the outer cylinder 5 is provided with two cylindrical shells 12. Each shell 12 has an internal thread at its outer end. The two shells 12 can be fixed to the two discs 7 by the threads respectively. The shells 12 can protect the fixed pulley 8 and the rope 9. The rear side of the two shells 12 is fixed with a base 13 by bolts, and the base 13 has multiple through holes to fix the base 13 in a designated position.

[0023] The inlet pipe 1 and outlet pipe 2 are both provided with external threads at the ends outside the sleeve 3 to facilitate connection between the inlet pipe 1 and outlet pipe 2 and rigid pipes; or the ends of the inlet pipe 1 and outlet pipe 2 outside the sleeve 3 are both pagoda-shaped connectors to facilitate connection between the inlet pipe 1 and outlet pipe 2 and flexible pipes.

[0024] Multiple connecting rods 14, symmetrical about the axis of the outer cylinder 5, are fixed on the outer wall of the outer cylinder 5, which facilitates the connection of the outer cylinder 5 to an external power hydraulic cylinder or motor to realize the up-and-down reciprocating motion of the outer cylinder 5.

[0025] In use, the base 13 is first fixed in a designated position through the through hole. Then, the front and rear liquid pipes are connected and fixed to the inlet pipe 1 and outlet pipe 2 respectively. An external power source, such as a hydraulic pump or motor, is connected to the connecting rod 14, so that the external power can drive the outer cylinder 5 to move up and down through the connecting rod 14. Since both the inlet pipe 1 and the outlet pipe 2 are fixed to the base 13 through the disc 7 and the housing 12, the two plungers 4 will not move during operation. Figures 4 to 5 The cavity between the lower plunger 4 and the lower piston 6 is defined as V1, the cavity between the lower piston 6 and the middle piston 6 is defined as V2, the cavity between the middle piston 6 and the upper piston 6 is defined as V3, and the cavity between the upper piston 6 and the upper plunger 4 is defined as V4.

[0026] When external power drives the outer cylinder 5 to move downward through the connecting rod 14, the outer cylinder 5 pulls the upper sleeve 3 to compress the spring 11 and move upward through the rope 9. The lower rope 9 relaxes, causing the lower sleeve 3 to move upward under the elastic force of the spring 11. That is, the outer cylinder 5 and the middle piston 6 move downward, the upper and lower sleeves 3 and the upper and lower pistons 6 move upward, and the two plungers 4 do not move. Therefore, V1 increases, V2 decreases, V3 increases, and V4 decreases. As V1 increases, the liquid in the inlet pipe 1 is drawn into the V1 chamber. As V2 decreases and V3 increases, the liquid in the V2 chamber is forced into the V3 chamber. As V4 decreases, the liquid in the V4 chamber is forced into the outlet pipe. Therefore, the device simultaneously draws and pumps liquid during the upward movement of the outer cylinder 5.

[0027] When external power drives the outer cylinder 5 to move upward through the connecting rod 14, the outer cylinder 5 pulls the lower sleeve 3 to compress the spring 11 and move downward through the rope 9. The upper rope 9 loosens, causing the upper sleeve 3 to move downward under the elastic force of the spring 11. That is, the outer cylinder 5 and the middle piston 6 move upward, the upper and lower sleeves 3 and the upper and lower pistons 6 move downward, and the two plungers 4 do not move. Therefore, V1 decreases, V2 increases, V3 decreases, and V4 increases. However, since the two plungers 4 do not move and the middle piston 6 moves upward, the sum of V1 and V2 increases, and the sum of V3 and V4 decreases. As the sum of V1 and V2 increases, the liquid in the inlet pipe 1 passes through the V1 chamber and is drawn into the V2 chamber, and the volume of the drawn liquid is the difference between the volumes of the V2 and V1 chambers. As the sum of V3 and V4 decreases, the liquid in the V3 chamber passes through the V4 chamber and is pressed into the outlet pipe 2, and the volume of the pressed liquid is the difference between the volumes of the V3 and V4 chambers. There is no liquid flow between V2 and V3, so the device simultaneously draws and pumps liquid as the outer cylinder 5 moves downward.

[0028] In summary, the device is always simultaneously drawing and pumping liquid during the up-and-down movement of the outer cylinder 5. The pressure changes experienced by the pipes connected before and after the device are respectively due to the difference between twice the volume of chamber V1 and the volume of chamber V2, and the difference between twice the volume of chamber V4 and the volume of chamber V3. Therefore, if the diameter of sleeve 3 and outer cylinder 5 is larger or the wall thickness of sleeve 3 is smaller during manufacturing, the pressure changes at the inlet pipe 1 and outlet pipe 2 will be smaller during use. Secondly, the flow rate of a piston pump is determined by three factors: the pump cylinder diameter, the piston stroke, and the number of piston reciprocations per minute. In existing piston pumps, during one reciprocating motion of the piston driven by the drive unit, the volume of space swept by the piston is twice the volume of the pump cylinder, while the volume of liquid sucked in or pumped out is only one times the volume of the pump cylinder. That is, the volume of liquid sucked in or pumped out accounts for only half of the volume of space swept by the piston, thus greatly limiting the working efficiency of existing piston pumps. However, in this device, during the movement of the outer cylinder 5 from its lowest point to its highest point, the volume swept by the intermediate piston 6 is approximately equal to (actually less than) the volume of liquid sucked in by the device during this stage. Similarly, during the movement of the outer cylinder 5 from its highest point to its lowest point, the volume swept by the intermediate piston 6 is approximately equal to (actually greater than) the volume of liquid sucked in by the device during this stage. Therefore, in one reciprocating motion of the intermediate piston 6 driven by the drive unit, the volume of liquid sucked in or pumped out by this device is approximately equal to the volume of space swept by the piston 6, significantly improving working efficiency.

[0029] This invention has the following significant advantages: 1. This invention uses the outer cylinder 5 to drive the two sleeves 3 to move up and down, thereby causing the volume of the four cavities between the two plungers 4 and the three pistons 6 to change continuously. Combined with the one-way valve, this achieves the effect of continuous liquid pumping. Furthermore, during operation, the pressure changes at the inlet pipe 1 and outlet pipe 2 are related to the diameter and wall thickness of the sleeves 3. In manufacturing, it is easy to reduce the pressure changes by increasing the diameter of the sleeves 3 and decreasing the wall thickness of the sleeves 3, which helps to extend the service life of the pipe body and the pipe connection seal.

[0030] 2. The present invention uses ropes 9 and fixed pulleys 8 at the upper and lower ends to ensure that the middle piston 6 and the upper and lower side pistons 6 always move up and down at the same speed and distance. Therefore, regardless of whether the middle piston 6 moves up or down, the equidistant movement of the three pistons 6 can always draw in or pump out a liquid volume approximately equal to the volume of space swept by the middle piston 6. Thus, with the three factors that determine the flow rate of the piston pump remaining unchanged, the pumping pressure of the middle piston 6 in one reciprocating motion of this device is approximately twice that of the existing piston pump, greatly improving the working efficiency and representing a significant advancement.

[0031] 3. The structure adopted in this invention is an outer cylinder 5 with two upper and lower sleeves 3, and the upper and lower sleeves 3 are fitted with the inlet pipe 1 and the outlet pipe 2. There are no branching paths or buffer chambers, resulting in high space utilization and small size. Moreover, all components are coaxially designed. During production, the outer cylinder 5 with the same diameter can be designed according to the diameter of the front and rear pipes. During installation, the device is coaxially installed with the pipes, which occupies even less space and can be applied to various narrow spaces.

[0032] It should be noted that the terms "up," "down," "left," and "right" used in this article refer to the attached... Figure 1 The direction in.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0034] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A continuous pumping piston pump, characterized in that, The system includes an inlet pipe (1), an outlet pipe (2) coaxially positioned above the inlet pipe (1), and a sleeve (3) coaxially fitted on the outer side of the inlet pipe (1) and the outlet pipe (2) at their respective ends. Each sleeve (3) contains a plunger (4), the outer walls of the two plungers (4) are fitted and sealed against the inner wall of the sleeve (3), and the two plungers (4) are fixed to the ends of the inlet pipe (1) and the outlet pipe (2) respectively. An outer cylinder (5) is coaxially fitted on the outer side of the two sleeves (3), and three pistons (6) arranged vertically are provided inside the outer cylinder (5). The outer walls of the three pistons (6) are fitted and sealed against the inner wall of the outer cylinder (5), and the middle piston (6) is fixed to the inner wall of the outer cylinder (5), while the upper and lower pistons (6) are fixed to the ends of the upper and lower sleeves (3) respectively. When the outer cylinder (5) moves upward, the two sleeves (3) move downward simultaneously and synchronously; when the outer cylinder (5) moves downward, the two sleeves (3) move upward simultaneously and synchronously. Both plungers (4) and three pistons (6) are equipped with one-way valves, and these valves ensure that fluid can only flow from the inlet pipe (1) to the outlet pipe (2). An annular disc (7) is fixed to the end of the inlet pipe (1) and outlet pipe (2) away from their respective plungers (4). Multiple fixed pulleys (8) are fixed to the side of each disc (7) near the sleeve (3). Multiple ropes (9) are fixed to both the upper and lower ends of the outer cylinder (5), and each rope (9) passes around the fixed pulley (8) and... The sleeves (3) on the same side are fixed, and a washer (10) is fixed on the inner wall of the end of each sleeve (3) away from the piston (6). A compression spring (11) is provided between each washer (10) and the disc (7) on the same side. The compression spring (11) makes the two sleeves (3) tend to move away from the disc (7). The outer wall of the disc (7) is provided with threads. Two cylindrical shells (12) are provided on the outer side of the outer cylinder (5). The outer end of each shell (12) is provided with internal threads. The two shells (12) can be fixed to the two discs (7) by threads respectively. The rear side of the two shells (12) is fixed with a base (13) by bolts, and multiple through holes are opened on the base (13).

2. The continuous pumping piston pump according to claim 1, characterized in that, The inlet pipe (1) and outlet pipe (2) are both externally threaded at one end outside the sleeve (3), or the inlet pipe (1) and outlet pipe (2) are both pagoda-shaped connectors at one end outside the sleeve (3).

3. The continuous pumping piston pump according to claim 1, characterized in that, Multiple connecting rods (14) are fixed on the outer wall of the outer cylinder (5) with respect to the axis of the outer cylinder (5).

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