A low pulsation external rotating single tube peristaltic pump

Abstract

The present invention discloses a low-pulsation external rotating single-tube peristaltic pump, wherein a driving mechanism, a rotating tube pressing mechanism and a pipeline mechanism are arranged on a mounting plate, wherein the pipeline mechanism comprises an extrusion sleeve and an elastic hose, wherein the elastic hose is spirally arranged on the outer side of the extrusion sleeve in a vertical direction; the rotating tube pressing mechanism comprises a roller assembly and a rotating seat, wherein one end of the rotating seat is connected to the output end of the driving mechanism, and the other end is connected to the extrusion sleeve, wherein the roller assembly is arranged on the side of the rotating seat and is located on the outer side of the elastic hose; the driving mechanism drives the rotating seat to rotate, drives the roller assembly to rotate and squeeze the elastic hose, and there is a continuous and uniform time difference between each circle of the elastic hose being squeezed or released, thereby realizing continuous low-pulsation delivery of the fluid. The present invention has the characteristics of low wear on the inner wall of the hose and high continuous filling accuracy, effectively reduces the pulsation during fluid transmission, and solves the problems of fluid contamination and low continuous filling accuracy caused by severe wear on the inner wall of the hose in the existing peristaltic pump, and the problems of severe wear on the inner wall of the hose and generation of a large number of particles, and the low continuous filling accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid filling pumps, and in particular relates to a low-pulsation external rotating single-tube peristaltic pump. Background Art

[0002] A peristaltic pump is a liquid delivery device with controllable flow rate. It uses a rotating roller to roll an elastic hose. The fluid in the hose moves as the roller rotates, just like squeezing the hose with two fingers. As the fingers move, the liquid flows.

[0003] Existing peristaltic pumps rely on a roller assembly with a rotating device to rotate and roll the hose to discharge the fluid. For the same hose, the roller squeezes or spins the hose at the same position each time it is filled. The inner wall of the hose at this position will be severely worn, and a large number of particles are easily generated, causing the fluid to be contaminated.

[0004] The existing peristaltic pump controls the rolling extrusion volume of the fluid by the number of turns or angle of the roller assembly. For each filling, the initial position and the end position of the roller assembly rolling the hose will not be at the same position due to the accumulation of turns or angles. In addition, the elastic recovery of the hose at different positions is also different, making it difficult for the traditional peristaltic pump to achieve the expected continuous filling accuracy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to effectively reduce the pulsation of the existing peristaltic pump during fluid transmission, and at the same time solve the problems of severe wear of the inner wall of the hose, easy generation of a large number of particles leading to fluid contamination, and low continuous filling accuracy. A low-pulsation external rotating single-tube peristaltic pump with a compact structure, convenient disassembly and assembly, high reliability, low wear of the inner wall of the hose, high continuous filling accuracy and low cost is provided.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A low-pulsation externally rotating single-tube peristaltic pump comprises a mounting plate, on which a driving mechanism, a rotating tube pressing mechanism and a pipeline mechanism are arranged, the pipeline mechanism comprises an extrusion sleeve and an elastic hose, and an elastic hose is spirally arranged on the outer side of the extrusion sleeve along the vertical direction; the rotating tube pressing mechanism comprises a roller assembly and a rotating seat, one end of the rotating seat is connected to the output end of the driving mechanism, and the other end of the rotating seat is connected to the extrusion sleeve, the roller assembly is arranged on the side of the rotating seat, and the roller assembly is located on the outer side of the elastic hose; under the drive of the driving mechanism, the rotating seat rotates, driving the roller assembly to rotate and squeeze the spiral elastic hose arranged in the vertical direction, and there is a continuous and uniform time difference, that is, a phase difference, when each circle of the elastic hose is squeezed or released, so as to realize continuous low-pulsation delivery of the fluid.

[0008] As a further improvement of the present invention, a single set of roller assemblies is arranged on the side of the rotating seat, and the height of the roller assembly matches the height of the spiral elastic hose.

[0009] As a further improvement of the present invention, the roller group includes: a roller shaft, a first deep groove ball bearing and a roller; one end of the roller shaft is connected and fixed to a rotating seat, the roller is nested in the outer periphery of the other end of the roller shaft, and the first deep groove ball bearings are provided at the connection between the two ends of the roller and the roller shaft to enable the roller to roll the elastic hose while rotating.

[0010] As a further improvement of the present invention, a shaft elastic retaining ring is provided at the end of the roller shaft, and the shaft elastic retaining ring is located outside the first deep groove ball bearing to limit the displacement of the first deep groove ball bearing.

[0011] As a further improvement of the present invention, a first positioning notch and an installation notch are provided at the end of the extrusion sleeve. The first positioning notch and the installation notch are arranged opposite to each other. The elastic hose enters and exits the extrusion sleeve through the first positioning notch. After passing through the installation notch, the elastic hose is spirally arranged on the outside of the extrusion sleeve.

[0012] As a further improvement of the present invention, a plurality of spiral avoidance gaps are provided on the outer side of the extrusion sleeve along the vertical direction; the avoidance gaps cooperate with the roller to achieve an arc length of not less than 180° for a single-circle elastic hose to be rotated and extruded in the circumferential direction.

[0013] As a further improvement of the present invention, the pipeline mechanism also includes a traction rod located outside the roller group, the traction rod is in an L-shaped structure, one end of the traction rod is connected to the mounting plate, the other end of the traction rod is connected to the extrusion sleeve, and a second positioning notch corresponding to the first positioning notch is provided on the traction rod to assist in the positioning and installation of the elastic hose.

[0014] As a further improvement of the present invention, a waterproof retaining ring is provided between the rotating seat and the mounting platform, and an O-ring is provided between the waterproof retaining ring and the mounting platform.

[0015] As a further improvement of the present invention, the driving mechanism includes a reducer, a driving component and an external PLC controller; the driving component is installed on a mounting plate, and the output end of the driving component is connected to the roller rotation mechanism through the reducer; the driving component and the PLC controller are electrically connected, and the PLC controller controls the operation of the driving component.

[0016] As a further improvement of the present invention, the driving component adopts a stepping motor or a servo motor or a motor driving unit.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The low-pulsation external rotating single-tube peristaltic pump of the present invention is characterized in that the elastic hose is wound around the outside of the extrusion sleeve in the circumferential direction, one end of the rotating seat is connected to the output end of the driving mechanism, the other end of the rotating seat is connected to the extrusion sleeve, and the roller assembly is arranged on the side of the rotating seat and is located on the outside of the elastic hose; the driving mechanism drives the rotating seat to rotate to drive the roller assembly to rotate, and the roller assembly cooperates with the extrusion sleeve, that is, the elastic hose arranged in a spiral is squeezed in the vertical direction, and the fluid is driven to flow into the inlet of the elastic hose and transported to the outlet of the elastic hose, so as to achieve the purpose of continuous fluid transportation. Because a single group of roller assemblies rolls the spiral elastic hose while rotating, there is a continuous and uniform time difference, that is, a phase difference, when each circle of the elastic hose is squeezed or released, so that continuous low-pulsation fluid transportation is achieved, which not only ensures that the wear of the elastic hose by the tube pressing mechanism is minimized, but also avoids the risk of fluid contamination due to severe wear of the inner wall of the hose and the generation of a large number of particles, and effectively prolongs the service life of the elastic hose. Because during the rotation of the tube pressing mechanism, there is always a part of the elastic hose in an extruded state, so as to achieve the purpose of high-precision and large-capacity continuous filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structural principle of a low-pulsation external rotating single-tube peristaltic pump in a specific embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the right side structural principle of a low pulsation external rotating single tube peristaltic pump in a specific embodiment of the present invention.

[0021] Figure 3 It is a left-side structural principle schematic diagram of a low-pulsation external rotating single-tube peristaltic pump in a specific embodiment of the present invention.

[0022] Figure 4 It is a schematic diagram of the top structural principle of a low-pulsation external rotating single-tube peristaltic pump in a specific embodiment of the present invention.

[0023] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure principle in the AA direction.

[0024] Figure 6 It is a schematic diagram of the three-dimensional axonometric structure principle of a low-pulsation external rotating single-tube peristaltic pump in a specific embodiment of the present invention.

[0025] Legend: 1. Roller shaft; 2. Elastic retaining ring for shaft; 3. First deep groove ball bearing; 4. Roller; 5. Elastic hose; 6. Extrusion sleeve; 7. Second deep groove ball bearing; 8. Swivel seat; 9. Waterproof retaining ring; 10. O-ring; 11. Third deep groove ball bearing; 12. Mounting plate; 13. Reducer; 14. Drive assembly; 15. Traction rod; 16. Spring washer; 17. Bolt; 18. First positioning notch; 19. Mounting notch; 20. Second positioning notch; 21. Avoidance notch. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0027] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0029] Example

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 6As shown, the low-pulsation external rotating single-tube peristaltic pump of the present invention comprises a mounting plate 12, on which a driving mechanism, a rotating tube pressing mechanism and a pipeline mechanism are arranged. The pipeline mechanism comprises an extrusion sleeve 6 and a single elastic hose 5, and the elastic hose 5 is spirally arranged on the outer side of the extrusion sleeve 6 in the vertical direction. The rotating tube pressing mechanism comprises a roller assembly and a rotating seat 8, the bottom of the rotating seat 8 is connected to the output end of the driving mechanism, the top of the rotating seat 8 is connected to the bottom of the extrusion sleeve 6, the roller assembly is arranged on the side of the rotating seat 8, and the roller assembly is located on the outer side of the elastic hose 5. Driven by the driving mechanism, the rotating seat 8 rotates, driving the roller assembly to rotate and squeeze the spiral elastic hose 5 arranged in the vertical direction, and there is a continuous and uniform time difference, that is, a phase difference, when each circle of the elastic hose 5 is squeezed or released, so as to realize continuous low-pulsation delivery of the fluid.

[0031] like Figure 4 and Figure 6 As shown, a single roller assembly is arranged on the side of the rotating seat 8, and the height of the roller assembly matches the height of the spiral elastic hose 5 to ensure that during one rotation of the roller assembly, there is always a part on the elastic hose 5 in a squeezed state.

[0032] In this embodiment, the elastic hose 5 is wound around the outside of the extrusion sleeve 6 along the circumferential direction, one end of the rotating seat 8 is connected to the output end of the driving mechanism, and the other end of the rotating seat 8 is connected to the extrusion sleeve 6, and the roller assembly is arranged on the side of the rotating seat 8 and located outside the elastic hose 5; the rotating seat 8 is driven to rotate by the driving mechanism to drive the roller assembly to rotate, and the roller assembly cooperates with the extrusion sleeve 6, that is, the elastic hose 5 arranged in a spiral is squeezed in the vertical direction, and the fluid is driven to flow into the inlet of the elastic hose 5 and transported to the outlet of the elastic hose 5, so as to achieve the purpose of continuous fluid transportation. Because a single group of roller assemblies rotates and rolls the spiral elastic hose 5, there is a continuous and uniform time difference, that is, a phase difference, when each circle of the elastic hose 5 is squeezed or released, so that the continuous low-pulsation transportation of the fluid is achieved, which not only ensures that the wear of the elastic hose 5 by the pressing tube mechanism is minimized, but also avoids the risk of fluid contamination due to severe wear of the inner wall of the hose and the generation of a large number of particles, and effectively prolongs the service life of the elastic hose. Since the elastic hose part is always in an extruded state during the rotation of the pressing tube mechanism, the purpose of high-precision and large-capacity continuous filling is achieved.

[0033] like Figure 4 and Figure 5 As shown, the roller assembly includes: a roller shaft 1, a first deep groove ball bearing 3 and a roller 4. One end of the roller shaft 1 is connected and fixed to the rotating seat 8, and the roller 4 is nested in the outer periphery of the other end of the roller shaft 1. The first deep groove ball bearing 3 is provided at the connection between the two ends of the roller 4 and the roller shaft 1, so that the roller 4 can roll the elastic hose 5 while rotating.

[0034] Furthermore, a shaft elastic circlip 2 is provided at the end of the roller shaft 1 , and the shaft elastic circlip 2 is located outside the first deep groove ball bearing 3 to limit the displacement of the first deep groove ball bearing 3 .

[0035] like Figure 6 As shown, a first positioning notch 18 and a mounting notch 19 are provided at the end of the extrusion sleeve 6. The first positioning notch 18 and the mounting notch 19 are arranged opposite to each other. The position of the first positioning notch 18 is higher than that of the mounting notch 19. The elastic hose 5 enters and exits the extrusion sleeve 6 through the first positioning notch 18. After passing through the mounting notch 19, the elastic hose 5 is spirally arranged outside the extrusion sleeve 6. The elastic hose 5 is arranged obliquely between the first positioning notch 18 and the mounting notch 19 to improve the reliability of the installation of the elastic hose 5 and prevent the elastic hose 5 from being offset during the extrusion process.

[0036] like Figure 5 As shown, the outer side of the extrusion sleeve 6 is provided with a plurality of spiral avoidance notches 21 in the vertical direction; the avoidance notches 21 cooperate with the roller 4 to realize that the arc length of the single-circle elastic hose 5 being rotated and squeezed in the circumferential direction is not less than 180°. During each filling, the roller assembly on the outer side of the circumference of the extrusion sleeve 6 rotates and squeezes the elastic hose 5 arranged on the extrusion sleeve 6, pushing the fluid to flow in from the liquid inlet of the elastic hose 5 in a spiral downward direction, and after flowing through the entire elastic hose 5, it flows out from the liquid outlet of the elastic hose 5 in a spiral upward direction, realizing the continuous delivery of the fluid.

[0037] like Figure 1 and Figure 6 As shown, the pipeline mechanism also includes a traction rod 15 located outside the roller group. The traction rod 15 is L-shaped. The bottom of the traction rod 15 is connected to the mounting plate 12 by a fastening screw, and the top of the traction rod 15 is connected to the top of the extrusion sleeve 6 by a spring washer 16 and a bolt 17. The traction rod 15 is provided with a second positioning notch 20 corresponding to the first positioning notch 18 to assist in the positioning and installation of the elastic hose 5, thereby improving the stability of the installation of the elastic hose 5.

[0038] like Figure 5 and Figure 6 As shown, the driving mechanism includes a reducer 13, a driving assembly 14 and an external PLC controller. The driving assembly 14 is mounted on the mounting plate 12, and the output end of the driving assembly 14 is connected to the rotating seat 8 through the reducer 13; the driving assembly 14 is electrically connected to the PLC controller, and the PLC controller controls the operation of the driving assembly 14, such as controlling the start and stop, forward and reverse rotation, full speed, speed regulation and flow calibration of the driving assembly 14, so as to improve the control accuracy of filling.

[0039] In this embodiment, the driving assembly 14 adopts a stepping motor. In other embodiments, the driving assembly 14 may also adopt a servo motor or a motor drive unit. As long as the rotating seat 8 can be driven to rotate smoothly, the roller group can squeeze the elastic hose 5 smoothly.

[0040] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the spirit and technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention still fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A low pulsation external rotating single tube peristaltic pump, characterized in that: The invention comprises a mounting plate (12), on which a driving mechanism, a rotating tube pressing mechanism and a pipeline mechanism are arranged, wherein the pipeline mechanism comprises an extrusion sleeve (6) and an elastic hose (5), and the elastic hose (5) is arranged spirally on the outer side of the extrusion sleeve (6) in a vertical direction; the rotating tube pressing mechanism comprises a roller assembly and a rotating seat (8), one end of the rotating seat (8) is connected to the output end of the driving mechanism, and the other end of the rotating seat (8) is connected to the extrusion sleeve (6), and the roller assembly is arranged on the side of the rotating seat (8), and the roller assembly is located on the outer side of the elastic hose (5); under the drive of the driving mechanism, the rotating seat (8) rotates, driving the roller assembly to rotate and squeeze the spiral elastic hose (5) arranged in the vertical direction, and there is a continuous and uniform time difference, i.e., a phase difference, when each circle of the elastic hose (5) is squeezed or released, so as to realize continuous low-pulsation conveying of the fluid.

2. The low pulsation external rotating single tube peristaltic pump according to claim 1, characterized in that: A single set of roller components is arranged on the side of the rotating seat (8), and the height of the roller components matches the height of the spiral elastic hose (5).

3. The low pulsation external rotating single tube peristaltic pump according to claim 2, characterized in that: The roller assembly comprises: a roller shaft (1), a first deep groove ball bearing (3) and a roller (4); one end of the roller shaft (1) is connected and fixed to a rotating seat (8), the roller (4) is nested in the outer periphery of the other end of the roller shaft (1), and the first deep groove ball bearing (3) is provided at the connection between the two ends of the roller (4) and the roller shaft (1), so that the roller (4) can roll the elastic hose (5) while rotating.

4. The low pulsation external rotating single tube peristaltic pump according to claim 3, characterized in that: The end of the roller shaft (1) is provided with a shaft elastic retaining ring (2), and the shaft elastic retaining ring (2) is located outside the first deep groove ball bearing (3) to limit the displacement of the first deep groove ball bearing (3).

5. The low pulsation external rotating single tube peristaltic pump according to claim 4, characterized in that: The end of the extrusion sleeve (6) is provided with a first positioning notch (18) and a mounting notch (19); the first positioning notch (18) and the mounting notch (19) are arranged opposite to each other; the elastic hose (5) enters and exits the extrusion sleeve (6) through the first positioning notch (18); and the elastic hose (5) is spirally arranged outside the extrusion sleeve (6) after passing through the mounting notch (19).

6. The low pulsation external rotating single tube peristaltic pump according to claim 5, characterized in that: The outer side of the extrusion sleeve (6) is provided with a plurality of spiral avoidance notches (21) in the vertical direction; the avoidance notches (21) cooperate with the roller (4) to achieve an arc length of not less than 180° when the single-circle elastic hose (5) is rotated and extruded in the circumferential direction.

7. The low pulsation external rotating single tube peristaltic pump according to claim 6, characterized in that: The pipeline mechanism also includes a traction rod (15) located outside the roller group, the traction rod (15) is in an L-shaped structure, one end of the traction rod (15) is connected to the mounting plate (12), the other end of the traction rod (15) is connected to the extrusion sleeve (6), and the traction rod (15) is provided with a second positioning notch (20) corresponding to the first positioning notch (18) to assist in the positioning and installation of the elastic hose (5).

8. The low pulsation external rotating single tube peristaltic pump according to any one of claims 1 to 7, characterized in that: A waterproof retaining ring (9) is provided between the rotating seat (8) and the mounting platform (12), and an O-type sealing ring (10) is provided between the waterproof retaining ring (9) and the mounting platform (12).

9. The low pulsation external rotating single tube peristaltic pump according to any one of claims 1 to 7, characterized in that: The driving mechanism comprises a speed reducer (13), a driving component (14) and an external PLC controller; the driving component (14) is mounted on a mounting plate (12), and the output end of the driving component (14) is connected to a roller rotating mechanism via the speed reducer (13); the driving component (14) is electrically connected to the PLC controller, and the PLC controller controls the operation of the driving component (14).

10. The low pulsation external rotating single tube peristaltic pump according to claim 9, characterized in that: The driving component (14) adopts a stepping motor or a servo motor or a motor driving unit.

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