Peristaltic structure of peristaltic pump and pumping method thereof

Abstract

The invention discloses a peristaltic pump peristaltic structure and a pumping method thereof, and relates to the technical field of peristaltic pumps, the peristaltic pump peristaltic structure comprises a pump body, a pump pipe penetrates through the pump body, a plurality of pressing blocks are arranged on one side of the pump pipe in the length direction of the pump pipe in an array mode, and the pressing blocks are in sliding connection with the pump body; a rotating shaft rotationally connected with the pump body is arranged on the other side, opposite to the pump pipe, of each pressing block, a spiral protruding block is arranged on the outer side of each rotating shaft in the axial direction of the rotating shaft, and the rotating shafts drive the spiral protruding blocks to rotate so as to sequentially push the multiple pressing blocks to circularly press the pump pipe. According to the peristaltic pump peristaltic structure and the pumping method thereof, tensile deformation of the pump pipe can be avoided, and long-time stable operation can be achieved; part of liquid can be effectively prevented from flowing back during pressing, and meanwhile fluid flows more evenly and continuously.

Description

Technical Field

[0001] The invention relates to the technical field of peristaltic pumps, in particular to a peristaltic structure of a peristaltic pump and a pumping method thereof. Background Art

[0002] Peristaltic pumps are generally composed of a driver, a pump head, and a pump hose (referred to as a pump tube), which can be used to allow fluid to flow in the pump tube. Currently, peristaltic pumps generally use a driver to drive the pump head to rotate, and the roller on the pump head squeezes the pump tube, causing the fluid to flow under the squeeze.

[0003] The pump head and pump tube need to be used together. The pump tube supported by the same pump head has restrictions on the diameter and wall thickness. There is friction between the pump tube and the pump head roller to generate heat or cause the pump tube to deform due to heat. There is no clear limit on the length of the pump tube matched with the pump head. There is a risk of tensile deformation. The diameter and wall thickness of the pump tube after tensile deformation change synchronously, and other application problems. In summary, various factors have led to a serious shortening of the pump tube life of the peristaltic pump, and irreversible deformation, rupture, adhesion and other problems have occurred one after another. Many performance parameters of the peristaltic pump will continue to change over time, especially the accuracy of fluid transportation, the effectiveness of elastic deformation and other aspects of the change will cause the peristaltic pump to fail to work according to the preset performance.

[0004] A push-type peristaltic pump is disclosed in the Chinese invention patent application number: CN201821458129.7. It includes an upper cover, a shell, a driving device, a chuck and a fixing block; the upper cover is provided with an opening, the upper cover is arranged above the shell, there are at least three driving devices, the driving devices are all arranged in the shell, each of the driving devices is provided with a push rod, and the driving device can drive the push rod to move downward or upward.

[0005] Although it solves the problem of easy deformation of the rotary peristaltic pump tube, since it applies pressure to the pump tube perpendicularly through the fixed block and there is a gap between adjacent fixed blocks, the fluid in the tube will be discharged to both sides of the fixed block during the pressure application process, causing part of the liquid to flow back, affecting the pumping effect; at the same time, it will cause the fluid to flow in a pulsed manner.

[0006] Therefore, it is necessary to propose a peristaltic pump peristaltic structure and a pumping method thereof to solve the above problems. Summary of the invention

[0007] 1. Technical issues to be resolved The object of the present invention is to provide a peristaltic pump peristaltic structure and a pumping method thereof, so as to solve the problems of unstable fluid flow and poor pumping effect of the existing press-type peristaltic pump mentioned in the above background technology.

[0008] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: a peristaltic pump peristaltic structure, comprising a pump body, a pump tube running through the pump body, a plurality of pressing blocks arranged in an array along the length direction of one side of the pump tube, and the pressing blocks are slidably connected to the pump body; The other side of the pressing block relative to the pump tube is provided with a rotating shaft rotatably connected to the pump body, and the outer side of the rotating shaft is provided with a spiral protrusion along its axial direction. The rotating shaft drives the spiral protrusion to rotate to sequentially push multiple pressing blocks to cyclically press the pump tube.

[0009] Preferably, the spiral protrusions are continuous protrusions in a spiral shape or protrusions distributed at intervals in a spiral shape.

[0010] Preferably, there are multiple pump tubes, and the multiple pump tubes are arranged in parallel.

[0011] Preferably, a swing gap is provided between two adjacent pressing blocks, and the swing gap allows the spiral protrusion to drive the pressing block to press obliquely along the liquid supply direction of the pump tube.

[0012] Preferably, limiting sliding grooves are provided on both sides of the pressing block, and a limiting block is fixedly connected to a position on the inner side of the pump body corresponding to the limiting sliding groove, and the width of the limiting sliding groove is greater than the width of the limiting block.

[0013] Preferably, the pressure block is fixedly connected to both sides with a second magnetic block, and the inner side of the pump body corresponding to the second magnetic block is fixedly connected to a first magnetic block, and the first magnetic block and the second magnetic block attract each other with opposite poles to assist in resetting the bump.

[0014] Preferably, a return spring is provided between the side of the pressing block opposite to the rotating shaft and the pump body.

[0015] Preferably, a micro switch is fixedly connected to one side of the end of the pump body, and a protrusion is fixedly connected to the outer side of the rotating shaft at a position corresponding to the micro switch.

[0016] The method for pumping using the peristaltic pump peristaltic structure comprises the following steps: The rotating shaft is driven to rotate by a driving mechanism; The spiral protrusion on the outer side of the rotating shaft pushes the pressing block to press the pump tube; After the current pressing block is pressed, the pump tube is closed. As the spiral convex block rotates, the next pressing block gradually presses the pump tube from the side close to the current pressing block, displacing the fluid in the pump tube in the pumping direction. The previous pressing block is gradually lifted, and the pump tube recovers its elastic deformation, and the negative pressure sucks in the fluid. Multiple pressing blocks are pressed in a continuous cycle from beginning to end to achieve fluid pumping.

[0017] (III) Beneficial effects Compared with the prior art, the present invention provides a peristaltic pump peristaltic structure and a pumping method thereof, which have the following beneficial effects: 1. The peristaltic structure of the peristaltic pump and the pumping method thereof use a spiral convex block to push a plurality of pressure blocks to cyclically press the pump tube, thereby achieving the pumping of the liquid in the pump tube, avoiding the stretching deformation of the pump tube, and ensuring that it can operate stably for a long time.

[0018] 2. The peristaltic structure of the peristaltic pump and the pumping method thereof use a spiral protrusion to push the pressure block to press the pump tube obliquely from the position close to the closure so as to fit the deformation caused by the previous pressure block pressing the pump tube, thereby achieving pressure with the maximum contact surface. This can effectively avoid partial liquid reflux during pressing, and at the same time avoid impact pressing of the pump tube to cause pulsating flow in the pipeline, making the fluid flow more uniform and continuous.

[0019] 3. The peristaltic structure of the peristaltic pump and the pumping method thereof are provided with a bump and a micro switch, and the micro switch is triggered during the rotation of the shaft to monitor the number of rotations and the state, and position calibration and pump tube anti-fatigue operation can also be performed accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the structure of the present invention; Figure 3 It is a front view schematic diagram of the structure of the present invention; Figure 4 A schematic diagram of a pressing block connection structure of the present invention; Figure 5 For the present invention Figure 4 A three-dimensional schematic diagram of the middle pressure block; Figure 6 It is a schematic diagram of another pressing block connection structure of the present invention.

[0021] In the figure: 1. pump body; 2. pump tube; 3. rotating shaft; 4. convex block; 5. micro switch; 6. spiral convex block; 7. pressure block; 8. limit block; 9. limit slide groove; 10. first magnetic block; 11. second magnetic block; 12. reset spring. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] See also Figure 1-2As shown, a peristaltic structure of a peristaltic pump includes a pump body 1, a pump tube 2 is passed through the pump body 1, a plurality of pressing blocks 7 are arranged in an array along the length direction of one side of the pump tube 2, and the pressing blocks 7 are slidably connected to the pump body 1; a rotating shaft 3 rotatably connected to the pump body 1 is provided on the other side of the pressing block 7 relative to the pump tube 2, and a spiral protrusion 6 is provided on the outer side of the rotating shaft 3 along its axial direction, and the rotating shaft 3 drives the spiral protrusion 6 to rotate to push the plurality of pressing blocks 7 in sequence to cyclically press the pump tube 2.

[0024] In the non-working state, there is always one pressing block 7 among the multiple pressing blocks 7 pressing the pump tube 2, so that the pump tube 2 forms a closed cut-off state to prevent the fluid from flowing by itself or flowing back.

[0025] During operation, the shaft 3 is driven to rotate by external power, and the spiral protrusions 6 on the outside of the shaft 3 sequentially contact the pressing blocks 7 on the top of the shaft 3 to push the pressing blocks 7 to press the pump tube 2, generating elastic deformation. When the spiral protrusions 6 leave the pressing blocks 7, the pump tube 2 recovers its elastic shape and pushes the pressing blocks 7 to reset. As the rotation proceeds, the multiple pressing blocks 7 cyclically rise and fall to realize the flow of the liquid in the pump tube 2. Preferably, the shaft 3 is driven to rotate by a servo motor.

[0026] Specifically, the spiral protrusions 6 are continuous protrusions in a spiral shape or protrusions distributed at intervals in a spiral shape.

[0027] In order to realize the supply of multiple liquids at the same time, there are multiple pump tubes 2, and the multiple pump tubes 2 are arranged in parallel. During operation, the pressing block 7 presses the multiple pump tubes 2 at the same time.

[0028] In some embodiments, a swing gap is provided between two adjacent pressing blocks 7 , and the swing gap allows the spiral protrusion 6 to drive the pressing block 7 to press obliquely along the liquid supply direction of the pump tube 2 .

[0029] The spiral protrusion 6 pushes the pressing block 7 to press the pump tube 2. When the spiral protrusion 6 acts on the pressing block 7, it first contacts one side of the pressing block 7, pushing the pressing block 7 to move upward, so that its pressing end fits the deformation caused by the previous pressing block 7 pressing the pump tube 2, and the pressing of the maximum contact surface is achieved. As the spiral protrusion 6 rotates, when it contacts the middle of the pressing block 7, the pressing block 7 is flush with the pump tube 2, completing the pressing action. This pressing method can effectively avoid partial liquid reflux during pressing; by pressing multiple pressing blocks 7 in turn and in a cycle, the impact pressing of the pump tube 2 to cause pulsating flow in the pipeline is avoided, and the fluid flow is more uniform and continuous.

[0030] See also Figure 4-6As shown, in some embodiments, the pressing block 7 is slidably connected to the pump body 1 through the limiting block 8 and the limiting slide groove 9. Specifically, the limiting slide grooves 9 are provided on both sides of the pressing block 7, and the limiting block 8 is fixedly connected to the inner side of the pump body 1 at a position corresponding to the limiting slide groove 9. In order to enable the pressing block 7 to be tilted and pressed, the width of the limiting slide groove 9 is greater than the width of the limiting block 8, so as to allow the spiral protrusion 6 to drive the pressing block 7 to be tilted and pressed along the liquid supply direction of the pump tube 2.

[0031] See also Figure 4-5 As shown, in some embodiments, the second magnetic block 11 is fixedly connected to both sides of the pressing block 7, and the first magnetic block 10 is fixedly connected to the inner side of the pump body 1 at a position corresponding to the second magnetic block 11. When the pressing block 7 is pushed by the spiral protrusion 6 to press the pump tube 2, the first magnetic block 10 moves away from the second magnetic block 11. When the spiral protrusion 6 moves away from the pressing block 7, the first magnetic block 10 and the second magnetic block 11 attract each other with opposite poles, and the auxiliary protrusion 4 is reset.

[0032] See also Figure 6 As shown, in some embodiments, a return spring 12 is provided between the side of the pressing block 7 relative to the rotating shaft 3 and the pump body 1. When the pressing block 7 is pushed by the spiral protrusion 6 to press the pump tube 2, the return spring 12 is compressed, and when the spiral protrusion 6 moves away from the pressing block 7, the return spring 12 releases elastic potential energy to assist the protrusion 4 in returning to its original position.

[0033] See also Figure 3 As shown, in some embodiments, a micro switch 5 is fixedly connected to one side of the end of the pump body 1 , and a protrusion 4 is fixedly connected to the outer side of the rotating shaft 3 at a position corresponding to the micro switch 5 .

[0034] When the rotating shaft 3 rotates to a specific angle, the micro switch 5 is triggered to generate a switch signal. The number of rotations and the state of the rotating shaft 3 are determined by the number of switch signals. It can also be used for position calibration and anti-fatigue operation. During the anti-fatigue operation, the pressing block 7 that performs the pressing action in the static state is changed to reduce the probability of irreversible deformation of the pump tube 2 caused by a certain pressing block 7 pressing the pump tube 2 for a long time.

[0035] A pumping method of a peristaltic pump peristaltic structure: The rotating shaft 3 is driven to rotate by a driving mechanism; The spiral protrusion 6 on the outer side of the rotating shaft 3 pushes the pressing block 7 to press the pump tube 2; After the current pressing block 7 is pressed, the pump tube is closed. As the spiral convex block 6 rotates, the next pressing block 7 gradually presses the pump tube 2 from the side close to the current pressing block 7, displacing the fluid in the pump tube 2 in the pumping direction. The previous pressing block 7 is gradually lifted, and the pump tube 2 recovers its elastic deformation, and the negative pressure sucks in the fluid. The plurality of pressing blocks 7 are pressed in a continuous cycle from beginning to end to achieve fluid pumping.

[0036] The use of this pumping method for delivery can effectively avoid the problem of partial liquid backflow during pressing, while making the fluid flow more uniform and continuous.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A peristaltic pump peristaltic structure, comprising a pump body (1), characterized in that: A pump tube (2) passes through the pump body (1), and a plurality of pressing blocks (7) are arranged in an array along the length direction of one side of the pump tube (2), and the pressing blocks (7) are slidably connected to the pump body (1); The pressing block (7) is provided with a rotating shaft (3) rotatably connected to the pump body (1) on the other side of the pump tube (2); a spiral protrusion (6) is provided on the outer side of the rotating shaft (3) along its axial direction; the rotating shaft (3) drives the spiral protrusion (6) to rotate so as to sequentially push the plurality of pressing blocks (7) to cyclically press the pump tube (2).

2. A peristaltic pump peristaltic structure according to claim 1, characterized in that: The spiral protrusions (6) are continuous protrusions in a spiral shape or protrusions distributed at intervals in a spiral shape.

3. A peristaltic pump peristaltic structure according to claim 1, characterized in that: There are a plurality of pump tubes (2), and the plurality of pump tubes (2) are arranged in parallel.

4. A peristaltic pump peristaltic structure according to claim 1, characterized in that: A swing gap is provided between two adjacent pressing blocks (7), and the swing gap allows the spiral protrusion (6) to drive the pressing block (7) to tilt and press along the liquid supply direction of the pump tube (2).

5. The peristaltic pump peristaltic structure according to claim 1, characterized in that: Limiting slide grooves (9) are provided on both sides of the pressure block (7); a limiting block (8) is fixedly connected to a position on the inner side of the pump body (1) corresponding to the limiting slide grooves (9); and the width of the limiting slide grooves (9) is greater than the width of the limiting block (8).

6. The peristaltic pump peristaltic structure according to claim 1, characterized in that: The pressure block (7) is fixedly connected to a second magnetic block (11) on both sides, and the pump body (1) is fixedly connected to a first magnetic block (10) at a position corresponding to the second magnetic block (11) on the inner side, and the first magnetic block (10) and the second magnetic block (11) attract each other with opposite poles, so as to assist the protrusion (4) in resetting.

7. The peristaltic pump peristaltic structure according to claim 1, characterized in that: A return spring (12) is provided between the side of the pressure block (7) opposite to the rotating shaft (3) and the pump body (1).

8. The peristaltic pump peristaltic structure according to claim 1, characterized in that: A micro switch (5) is fixedly connected to one side of the end of the pump body (1), and a protrusion (4) is fixedly connected to the outer side of the rotating shaft (3) at a position corresponding to the micro switch (5).

9. A method for pumping using a peristaltic pump peristaltic structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: driving the rotating shaft (3) to rotate via a driving mechanism; The spiral protrusion (6) on the outer side of the rotating shaft (3) pushes the pressing block (7) to press the pump tube (2); After the current pressing block (7) is pressed, the pump tube is pressed to close. As the spiral protrusion (6) rotates, the next pressing block (7) gradually presses the pump tube (2) from the side close to the current pressing block (7), displacing the fluid in the pump tube (2) in the pumping direction. The previous pressing block (7) is gradually lifted, and the pump tube (2) recovers its elastic deformation, and the negative pressure sucks in the fluid. The plurality of pressing blocks (7) are pressed in a continuous cycle from head to tail to achieve fluid pumping.

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