CN113027736B

CN113027736B - Infusion pump

Info

Publication number: CN113027736B
Application number: CN202110543009.7A
Authority: CN
Inventors: 肖立峰; 陈洪伟
Original assignee: Chutianyuanchuang Biotechnology Changsha Co ltd
Current assignee: Chutianyuanchuang Biotechnology Changsha Co ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-09-03
Anticipated expiration: 2041-05-19
Also published as: CN113027736A

Abstract

An infusion pump comprises a first pump shell, a second pump shell, a main shaft and a wobble plate component, wherein the opposite sides of the first pump shell and the second pump shell are respectively provided with aThere are first pipeline containing groove and second pipeline containing groove used for centre gripping elastic pipeline, be equipped with first bearing frame and second bearing frame on the main shaft, the wobble plate subassembly is including locating the first wobble plate on the first bearing frame and locating the second wobble plate on the second bearing frame, be equipped with the first convex part with first pipeline containing groove complex on the first wobble plate, be equipped with the second convex part with second pipeline containing groove complex on the second wobble plate, have the interval between first wobble plate and the second wobble plate, if the central line of first wobble plate is L₁The central line of the second swinging plate is L₂The axis of rotation of the main shaft is L₃Then L is₁、L₂Are respectively connected with L₃Intersect and L₁And L₂Is a straight line with different surfaces. The invention has the advantages of simple and reliable structure, reduction of friction between the convex part and the corresponding elastic pipeline, elimination of friction on the inner wall of the elastic pipeline, prolonging of service life of the pump and the like.

Description

Infusion pump

Technical Field

The invention relates to a liquid pump, in particular to an infusion pump.

Background

A pump is a machine that delivers or pressurizes a liquid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, causing the liquid energy to increase. The pump is widely used for conveying liquid such as water, oil, acid-base liquid, emulsion, suspension emulsion, liquid metal and the like, and can also be used for conveying liquid, gas mixture and liquid containing suspended solids. Conventional pumps include centrifugal pumps, diaphragm pumps, piston pumps, peristaltic pumps, and the like. In the fields of chemical industry, food, pharmacy, bioengineering and the like, the pump has higher requirements on flow pulsation and flow precision, the traditional pump can not completely meet the requirements, and the product quality can not be ensured in use. The traditional peristaltic pump (pipeline pump) sucks or discharges liquid through moving a dead point of a pipeline, has the characteristics of convenience in cleaning and disinfection and low cost, but has the defects of short service life, poor flow state and the like due to large stress and easy fatigue of the dead point of the pipeline.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the infusion pump which has a simple and reliable structure, is beneficial to reducing the friction between the convex part and the corresponding elastic pipeline, eliminating the friction on the inner wall of the elastic pipeline and prolonging the service life of the pump.

In order to solve the technical problems, the invention adopts the following technical scheme:

infusion pumpThe elastic pipeline clamping device comprises a first pump shell, a second pump shell, a main shaft and a swinging plate assembly, wherein a first pipeline accommodating groove and a second pipeline accommodating groove which are used for clamping an elastic pipeline are respectively formed in opposite sides of the first pump shell and the second pump shell, a first bearing seat and a second bearing seat are arranged on the main shaft, the swinging plate assembly comprises a first swinging plate arranged on the first bearing seat and a second swinging plate arranged on the second bearing seat, a first convex part matched with the first pipeline accommodating groove is arranged on the first swinging plate, a second convex part matched with the second pipeline accommodating groove is arranged on the second swinging plate, a distance is formed between the first swinging plate and the second swinging plate, and if the central line of the first swinging plate is L₁The central line of the second swinging plate is L₂The rotation axis of the main shaft is L₃Then L is₁、L₂Are respectively connected with L₃Intersect and L₁And L₂Is a straight line with different surfaces.

As a further improvement of the above technical solution: the phase difference between the flow pulse formed by the first swinging plate extruding the elastic pipeline and the flow pulse formed by the second swinging plate extruding the elastic pipeline is 90 degrees.

As a further improvement of the above technical solution: the central point of the surface S1 of the first convex part extruding the elastic pipeline is O₁， L₁And L₃Cross point of (a) and O₁The center point of the surface S2 of the second convex part extruding the elastic pipeline is O₂，L₂And L₃Cross point of (a) and O₂And (4) overlapping.

As a further improvement of the above technical solution: the main shaft is provided with a first supporting backing ring and a second supporting backing ring which are mutually abutted, one surface of the first supporting backing ring, which is in contact with the first swinging plate, is arranged in parallel with the first swinging plate, and one surface of the second supporting backing ring, which is in contact with the second swinging plate, is arranged in parallel with the second swinging plate.

As a further improvement of the above technical solution: the width of two ends of the first pipeline accommodating groove is smaller than that of the middle section, and the depth of the two ends is larger than that of the middle section; the width of the two ends of the second pipeline accommodating groove is smaller than that of the middle section, and the depth of the two ends is larger than that of the middle section.

As a further improvement of the above technical solution: the first pipeline accommodating groove and the second pipeline accommodating groove respectively comprise two C-shaped grooves which are oppositely arranged, and one elastic pipeline is arranged in each C-shaped groove.

As a further improvement of the above technical solution: the liquid inlet end of each elastic pipeline is communicated with the liquid inlet collecting cavity, and the liquid outlet end of each elastic pipeline is communicated with the liquid outlet collecting cavity.

As a further improvement of the above technical solution: and check valves are respectively arranged between the liquid inlet end of the elastic pipeline and the liquid inlet collecting cavity and between the liquid outlet end of the elastic pipeline and the liquid outlet collecting cavity.

As a further improvement of the above technical solution: the check valve comprises a valve body, a first channel and a second channel which are arranged in the valve body, and an elastic membrane which is positioned between the first channel and the second channel, wherein a push rod is arranged in the first channel, the push rod is connected with the elastic membrane, and a plurality of liquid outlet holes are formed in the outlet of the second channel.

As a further improvement of the above technical solution: and a transmission key is arranged between the second bearing seat and the main shaft.

Compared with the prior art, the invention has the advantages that: the invention discloses an infusion pump, a first wobble plate and a second wobble plate of a wobble plate component are not integrally arranged on a main shaft, but a first bearing seat and a second bearing seat are arranged on the main shaft, a first swinging disk and a second swinging disk are arranged on the first bearing seat and the second bearing seat at intervals, the first swinging disk and the second swinging disk are not contacted any more, when the main shaft rotates, the first wobble plate and the second wobble plate swing around the intersection point of the rotation axis of the main shaft (similar to a conical pendulum) by respective central lines, the first wobble plate and the first pipeline accommodating groove are matched to extrude the corresponding elastic pipeline, and the second wobble plate and the second pipeline accommodating groove are matched to extrude the corresponding elastic pipeline, so that the friction between the convex part and the corresponding elastic pipeline is reduced, the friction on the inner wall of the elastic pipeline is eliminated, the service life of the elastic pipeline is prolonged, particles are prevented from being generated inside the elastic pipeline, and the first wobble plate is not needed.And the second wobble plate is provided with a recess and balls, so that the structure of the wobble plate assembly can be simplified, the inclination angles of the first wobble plate and the second wobble plate relative to the main shaft do not need to be kept consistent, the first wobble plate and the second wobble plate can be flexibly selected, and the L is₁And L₂The first wobble plate and the second wobble plate rotate at angles to realize phase difference compensation, so that the flow of the pump is more uniform, and the pump runs more stably.

Drawings

Fig. 1 is a schematic cross-sectional view of an infusion pump according to a first aspect of the present invention.

Fig. 2 is a schematic cross-sectional view of an infusion pump according to a second aspect of the present invention.

Fig. 3 is a perspective view of a wobble plate assembly of the present invention from a first perspective.

Fig. 4 is a perspective view of the wobble plate assembly of the present invention from a second perspective.

Fig. 5 is a schematic cross-sectional view of the wobble plate assembly of the present invention.

Fig. 6 is a perspective view of the first pump housing or the second pump housing in the present invention.

Fig. 7 is an exploded view of the main shaft, the first bearing housing and the second bearing housing of the present invention.

Fig. 8 is a schematic structural view of the open state of the check valve in the present invention.

Fig. 9 is a schematic perspective view of the liquid inlet collecting cavity, the liquid outlet collecting cavity and the elastic pipeline in the invention.

Fig. 10 is a schematic flow pulse-phase diagram of a first flexible conduit in accordance with the present invention.

Fig. 11 is a schematic flow pulse-phase diagram of a second flexible conduit according to the present invention.

Fig. 12 is a schematic flow pulse-phase diagram of a third flexible conduit in accordance with the present invention.

Fig. 13 is a schematic flow pulse-phase diagram of a fourth flexible conduit in accordance with the present invention.

Fig. 14 is a pulse-phase diagram of the flow after the flexible pipes are collected.

Fig. 15 is a partially enlarged view of fig. 2.

The reference numerals in the figures denote: 1. a first pump casing; 11. a first pipeline accommodating groove; 12. a liquid inlet; 13. a liquid outlet; 2. a second pump casing; 21. a second pipeline accommodating groove; 3. a main shaft; 31. a first bearing housing; 32. a second bearing housing; 33. a motor; 34. a drive key; 35. a first support grommet; 36. a second support grommet; 4. a wobble plate assembly; 41. a first convex portion; 42. a second convex portion; 43. a first wobble plate; 44. a second wobble plate; 5. an elastic conduit; 51. a first elastic tube; 52. a second elastic tube; 53. a third elastic tube; 54. a fourth flexible conduit; 6. a one-way valve; 61. a valve body; 62. a first channel; 63. a second channel; 65. an elastic diaphragm; 66. a top rod; 67. a liquid outlet hole; 7. a C-shaped groove; 81. a liquid inlet collection cavity; 82. a liquid outlet collection cavity; 91. a first limit ring; 92. a second stop collar; 93. a first bearing; 94. a second bearing.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

Fig. 1 to 15 show an embodiment of an infusion pump according to the present invention, where the infusion pump of this embodiment includes a first pump housing 1, a second pump housing 2, a main shaft 3, and a wobble plate assembly 4, opposite sides of the first pump housing 1 and the second pump housing 2 are respectively provided with a first pipeline receiving groove 11 and a second pipeline receiving groove 21 for holding an elastic pipeline 5, the main shaft 3 is provided with a first bearing seat 31 and a second bearing seat 32, the wobble plate assembly 4 includes a first wobble plate 43 disposed on the first bearing seat 31 and a second wobble plate 44 disposed on the second bearing seat 32, the first wobble plate 43 is provided with a first protrusion 41 engaged with the first pipeline receiving groove 11, the second wobble plate 44 is provided with a second protrusion 42 engaged with the second pipeline receiving groove 21, a gap is provided between the first wobble plate 43 and the second wobble plate 44, and if a center line of the first wobble plate 43 is L₁The central line of the second wobble plate 44 is L₂The axis of rotation of the spindle 3 is L₃Then L is₁、L₂Are respectively connected with L₃Intersect and L₁And L₂Is a straight line with different surfaces. The main shaft 3 may be driven to rotate by a common motor 33, for example, and a space between the first bearing block 31 and the main shaft 3 may be employedSynchronous rotation is realized in a shaft hole matching mode, synchronous rotation is realized between the second bearing seat 32 and the main shaft 3 by adopting a transmission key 34, and the end, far away from the motor 33, of the main shaft 3 is provided with a fastener to fix the second bearing seat 32 on the main shaft 3, so that the infusion pump can be conveniently disassembled, assembled and maintained.

In the infusion pump, the first wobble plate 43 and the second wobble plate 44 of the wobble plate assembly 4 are not integrally installed on the main shaft 3, but the main shaft 3 is provided with the first bearing seat 31 and the second bearing seat 32, the first wobble plate 43 and the second wobble plate 44 are installed on the first bearing seat 31 and the second bearing seat 32 at intervals, the first wobble plate 43 and the second wobble plate 44 are not contacted any more, and when the main shaft 3 rotates, the first wobble plate 43 and the second wobble plate 44 respectively use the respective central lines L₁、L₂Axis of rotation L with the main shaft₃The intersection point swing (similar to the conical pendulum), the elastic pipeline 5 corresponding to the first swing disk 43 and the first pipeline containing groove 11 in a matched extrusion manner, the elastic pipeline 5 corresponding to the second swing disk 44 and the second pipeline containing groove 21 in a matched extrusion manner, the friction between the convex part and the corresponding elastic pipeline 5 is reduced, the friction between the upper inner wall and the lower inner wall of each elastic pipeline 5 is eliminated, the service life of the elastic pipeline 5 is prolonged, particles are prevented from being generated inside the elastic pipeline 5, bowl-shaped recesses and balls are not required to be arranged on the first swing disk 43 and the second swing disk 44, the structure of the swing disk assembly 4 can be simplified, meanwhile, the inclination angles of the first swing disk 43 and the second swing disk 44 relative to the main shaft 3 are not required to be kept consistent, the selection can be flexibly carried out, the compensation angle is further reduced, the flow is more uniform, the pump operation is more stable, and L is₁、L₂Are respectively connected with L₃Intersect and L₁And L₂Is a heterofacial straight line, i.e. L₁And L₂The first wobble plate 43 and the second wobble plate 44 are not parallel or intersected, and the swing angle of the first wobble plate and the second wobble plate can realize compensation of 90 degrees, so that the flow of the pump is more uniform, and the operation is more stable.

Further, the phase difference between the flow pulse formed by the first wobble plate 43 pressing the elastic tube 5 and the flow pulse formed by the second wobble plate 44 pressing the elastic tube 5 is 90 °. Referring to fig. 9 to 14 in detail, in this embodiment, each of the upper first pipe receiving groove 11 and the lower second pipe receiving groove 21 includes two C-shaped grooves 7 arranged oppositely, the two C-shaped grooves 7 on the upper side are respectively provided with a first elastic pipe 51 and a second elastic pipe 52, the two C-shaped grooves 7 on the lower side are respectively provided with a third elastic pipe 53 and a fourth elastic pipe 54, the first swing disk 43 alternately presses the first elastic pipe 51 and the second elastic pipe 52, the phases of the flow pulses generated by the first elastic pipe 51 and the second elastic pipe 52 are different by 180 °, the second swing disk 44 alternately presses the third elastic pipe 53 and the fourth elastic pipe 54, the phases of the flow pulses generated by the third elastic pipe 53 are different by 180 °, the phases of the flow pulses generated by the same second elastic pipe 52 and the same fourth elastic pipe 54 are also different by 90 °, after the four elastic pipelines 5 are converged (the liquid inlet end is converged in the liquid inlet converging cavity 81, and the liquid outlet end is converged in the liquid outlet converging cavity 82), more continuous (or shorter flow pulse interval time) and more uniform (or smaller difference between wave crests and wave troughs) flow can be output. For example, the first wobble plate 43 may be arranged obliquely in the left-right direction, and the second wobble plate 44 may be arranged obliquely in the front-back direction (i.e., obliquely in the direction perpendicular to the paper), but in other embodiments, the relative positions of the first wobble plate 43 and the second wobble plate 44 may be kept unchanged, and the whole may be rotated around the main shaft 3 by a certain angle.

Referring to fig. 15, further, the center point of the surface S1 where the first protrusion 41 presses the elastic tube 5 is O₁，L₁And L₃Cross point of (a) and O₁The center point of the surface S2 where the second protrusion 42 presses the elastic tube 5 is O₂，L₂And L₃Cross point of (a) and O₂And (4) overlapping. When the main shaft 3 rotates, the first wobble plate 43 and the second wobble plate 44 only swing and extrude the elastic pipeline 5, and friction between the upper inner wall and the lower inner wall of the elastic pipeline 5 can be further reduced.

As a preferable technical solution, the main shaft 3 is provided with a first supporting backing ring 35 and a second supporting backing ring 36 which are mutually abutted, one surface of the first supporting backing ring 35, which is far away from the second supporting backing ring 36, is arranged in parallel with the first wobble plate 43 (specifically, the upper surface is arranged in parallel with the first wobble plate 43), and one surface of the first supporting backing ring 35, which is abutted against the second supporting backing ring 36, is arranged in parallel with the L₃Vertical (tool)The body is a lower surface and L₃Vertical); the surface of the second support backing ring 36 away from the first support backing ring 35 is arranged in parallel with the second wobble plate 44 (specifically, the lower surface is arranged in parallel with the second wobble plate 44), and the surface abutting against the first support backing ring 35 is arranged in parallel with the L₃Perpendicular (specifically upper surface and L)₃Vertical). Preferably, a first limit ring 91 is respectively arranged on the first bearing seat 31 and the second bearing seat 32, and a first bearing 93 is respectively arranged between the first pump shell 1 and the first limit ring 91 on the first bearing seat 31 and between the second pump shell 2 and the first limit ring 91 on the second bearing seat 32, so that the first bearing seat 31 and the second bearing seat 32 can rotate relative to the first pump shell 1 and the second pump shell 2; second limit rings 92 are respectively arranged on the first wobble plate 43 and the second wobble plate 44, and second bearings 94 are respectively arranged between the first support cushion ring 35 and the second limit ring 92 on the first wobble plate 43 and between the second limit ring 92 on the first wobble plate 43 and the first limit ring 91 on the first bearing seat 31, so that the first wobble plate 43 is supported; second bearings 94 are respectively arranged between the second supporting cushion ring 36 and a second limit ring 92 on the second wobble plate 44, and between the second limit ring 92 on the second wobble plate 44 and a first limit ring 91 on the second bearing seat 32, so that the second wobble plate 44 is supported, the structure is simple and reliable, and the elastic pipeline 5 is periodically extruded by the first wobble plate 43 and the second wobble plate 44.

Further, in this embodiment, the widths of the two ends of the first pipeline accommodating groove 11 are smaller than the width of the middle section, and the depths of the two ends are greater than the depth of the middle section; the width of both ends of the second pipeline accommodating groove 21 is smaller than the width of the middle section and the depth of both ends is larger than the depth of the middle section. The elastic tube 5 is disposed in the first tube receiving groove 11 and the second tube receiving groove 21, and when being pressed by the first protrusion 41 and the second protrusion 42, a pressure difference is more easily formed in the fluid in the elastic tube 5, and the fluid is rapidly sucked and discharged. At the same time, the special space formed by the first protrusion 41 and the second protrusion 42 is beneficial to prolonging the service life of the elastic pipe 5.

In the preferred embodiment, the check valves 6 are respectively disposed between the liquid inlet end of the elastic pipe 5 and the liquid inlet collecting cavity 81, and between the liquid outlet end of the elastic pipe 5 and the liquid outlet collecting cavity 82. The liquid in the elastic pipeline 5 is conveniently controlled to flow according to the designed direction through the one-way valve 6.

Further, in this embodiment, the check valve 6 includes a valve body 61, a first channel 62 and a second channel 63 disposed in the valve body 61, and an elastic membrane 65 located between the first channel 62 and the second channel 63, a push rod 66 is disposed in the first channel 62, the push rod 66 is connected to the elastic membrane 65, and a plurality of liquid outlet holes 67 are disposed at an outlet of the second channel 63. The check valve 6 with the structure has the advantages that when the liquid flows from the first channel 62 to the second channel 63, the elastic membrane 65 is pressed and deformed to effectively cover each liquid outlet hole 67 and effectively prevent the liquid from flowing through; when the liquid flows from the second channel 63 to the first channel 62, the elastic membrane 65 is pressed and deformed under the action of the ejector rod 66, the installation position of the elastic membrane 65 is kept still, the liquid can smoothly flow into the first channel 62, and after the liquid completely passes through, the elastic membrane 65 is restored to the initial state, so that the structure is simple and reliable.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. The utility model provides an infusion pump, includes first pump case (1), second pump case (2), main shaft (3) and balance weight subassembly (4), the opposite side of first pump case (1) and second pump case (2) is equipped with first pipeline storage tank (11) and second pipeline storage tank (21) that are used for centre gripping elasticity pipeline (5) respectively, its characterized in that: the main shaft (3) is provided with a first bearing seat (31) and a second bearing seat (32), and the wobble plate assembly (4) consists of a first wobble plate (43) arranged on the first bearing seat (31) and a second wobble plate arranged on the second bearing seat (32)Two balance pans (44) are formed, a first convex part (41) matched with the first pipeline containing groove (11) is arranged on the first balance pan (43), a second convex part (42) matched with the second pipeline containing groove (21) is arranged on the second balance pan (44), the first convex part (41) is positioned at one side, away from the second balance pan (44), of the first balance pan (43), the second convex part (42) is positioned at one side, away from the first balance pan (43), of the second balance pan (44), a distance is reserved between the first balance pan (43) and the second balance pan (44), and if the central line of the first balance pan (43) is L-shaped₁The central line of the second swinging plate (44) is L₂The rotation axis of the main shaft (3) is L₃Then L is₁、L₂Are respectively connected with L₃Intersect and L₁And L₂Is a straight line with different surfaces.

2. The infusion pump of claim 1, wherein: the phase difference between the flow pulse formed by the first swinging plate (43) extruding the elastic pipeline (5) and the flow pulse formed by the second swinging plate (44) extruding the elastic pipeline (5) is 90 degrees.

3. The infusion pump of claim 1, wherein: the central point of the surface S1 of the elastic pipeline (5) extruded by the first convex part (41) is O₁， L₁And L₃Cross point of (a) and O₁The center point of the surface S2 of the second convex part (42) extruding the elastic pipeline (5) is O₂，L₂And L₃Cross point of (a) and O₂And (4) overlapping.

4. The infusion pump of claim 1, wherein: be equipped with first support backing ring (35) and second support backing ring (36) of mutual butt on main shaft (3), the one side of first support backing ring (35) and first balance (43) contact with first balance (43) parallel arrangement, the one side of second support backing ring (36) and second balance (44) contact with second balance (44) parallel arrangement.

5. The infusion pump according to any one of claims 1 to 4, wherein: the width of two ends of the first pipeline accommodating groove (11) is smaller than that of the middle section, and the depth of the two ends is larger than that of the middle section; the width of the two ends of the second pipeline accommodating groove (21) is smaller than that of the middle section, and the depth of the two ends is larger than that of the middle section.

6. The infusion pump according to any one of claims 1 to 4, wherein: the first pipeline accommodating groove (11) and the second pipeline accommodating groove (21) respectively comprise two C-shaped grooves (7) which are oppositely arranged, and one elastic pipeline (5) is arranged in each C-shaped groove (7).

7. The infusion pump of claim 6, wherein: the device also comprises a liquid inlet collecting cavity (81) and a liquid outlet collecting cavity (82), wherein the liquid inlet end of each elastic pipeline (5) is communicated with the liquid inlet collecting cavity (81), and the liquid outlet end is communicated with the liquid outlet collecting cavity (82).

8. The infusion pump of claim 7, wherein: and check valves (6) are respectively arranged between the liquid inlet end of the elastic pipeline (5) and the liquid inlet collecting cavity (81) and between the liquid outlet end of the elastic pipeline and the liquid outlet collecting cavity (82).

9. The infusion pump of claim 8, wherein: check valve (6) include valve body (61), locate first passageway (62) and second passageway (63) in valve body (61) and be located elastic diaphragm (65) between first passageway (62) and second passageway (63), be equipped with ejector pin (66) in first passageway (62), ejector pin (66) with elastic diaphragm (65) link to each other, second passageway (63) exit is equipped with a plurality of liquid holes (67).

10. The infusion pump according to any one of claims 1 to 4, wherein: a transmission key (34) is arranged between the second bearing seat (32) and the main shaft (3).