A rotary peristaltic pump

Abstract

The embodiment of the specification discloses a rotary extrusion peristaltic pump, which comprises a rotary driving shaft, an annular cam, a pressing unit and a pump head pressing block, a hose is arranged between the pressing unit and the pump head pressing block, the rotary driving shaft drives the annular cam to rotate, and the pressing unit is driven by the annular cam to make linear reciprocating motion and press the hose. The scheme provides a rotary extrusion peristaltic pump, a cam is driven to rotate by a driving device to lift a pressing block and extrude a hose, so that the wear and noise of the hose are reduced.

Description

Technical Field

[0001] This application relates to the field of peristaltic pump technology, and more particularly to a rotary extrusion peristaltic pump. Background Technology

[0002] In the preparation or production of blood or pharmaceutical solutions, some blood or pharmaceutical solutions need to be transferred between bags or the flow rate of fluid in tubing needs to be controlled. Peristaltic pumps are needed in these cases because they do not come into contact with the fluid inside the tubing, thus preventing contamination of the blood or pharmaceutical solution. Furthermore, peristaltic pumps offer high precision and can be used for blood or pharmaceutical filling. Existing peristaltic pumps are typically rotary peristaltic pumps and multi-drive press-type peristaltic pumps, which suffer from significant wear on the tubing, a tendency for tubing misalignment after prolonged use, and the noise associated with multi-drive press-type peristaltic pumps. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the embodiments in this specification are implemented as follows:

[0004] This specification provides an embodiment of a rotary peristaltic pump, comprising: a rotary drive shaft, an annular cam, a pressing unit, and a pump head block. A hose is placed between the pressing unit and the pump head block. The rotary drive shaft drives the annular cam to rotate, and the pressing unit performs linear reciprocating motion under the drive of the annular cam to press the hose.

[0005] Optionally, the pressing unit includes at least two pressing blocks, and there are at least two annular cams. The at least two annular cams are nested together, and the protrusion positions of the at least two annular cams are different. Each annular cam drives only one pressing block.

[0006] Optionally, the annular cam is a ring with a hole in the middle and different axial heights.

[0007] Optionally, the rotary drive shaft is located in the middle of the annular cam, or the rotary drive shaft is located on the outside of the annular cam.

[0008] Optionally, the height of the annular cam and the extrusion block it drives is a constant.

[0009] Optionally, the bottom of the extrusion block is provided with a protrusion, and the annular cam lifts the extrusion block through the protrusion.

[0010] Optionally, the cross-section of the protrusion is fan-shaped.

[0011] Optionally, a spring is provided between the pressing unit and the pump head block, and a spring hole is provided on the pressing block.

[0012] Optionally, the pump head pressing block has a groove inside, and a guide groove is provided on the side wall of the pump head pressing block, and the pressing block moves along the guide groove.

[0013] Optionally, the top of the pump head pressure block has an L-shaped groove along the direction of the hose, through which the hose passes into the pump head pressure block and is fixed.

[0014] Optionally, there are three annular cams and three extrusion blocks, which are arranged in sequence as an inlet stop block, a working pressure block, and a drain stop block. When the three annular cams rotate, they lift the three extrusion blocks in a certain order.

[0015] Optionally, the working pressure block has a T-shaped structure, and the liquid inlet stop block and the liquid outlet stop block have an L-shaped structure.

[0016] Optionally, a limiting linkage structure is provided between adjacent annular cams, so that adjacent annular cams can move relative to each other within a certain range, and can achieve linkage after reaching the limiting position.

[0017] Optionally, the bottom of the extrusion block is provided with annular protrusions, and the sum of the central angles corresponding to the protrusions of the three annular cams and the central angles corresponding to the three annular protrusions is greater than 360 degrees.

[0018] Optionally, the annular cam consists of a compression cam, a liquid inlet stop cam, and a liquid outlet stop cam, arranged from the inside out. The compression cam is used to lift the working pressure block, the liquid inlet stop block, and the liquid outlet stop block, respectively.

[0019] Optionally, at least two of the annular cams have different protrusion heights, and at least two of the extrusion blocks have different heights.

[0020] The above-described at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0021] This invention provides a rotary extrusion peristaltic pump, which uses a drive device to rotate a cam to lift a pressure block and extrude a hose, thereby reducing hose wear and noise. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 An exploded view of a rotary extrusion peristaltic pump provided in the embodiments of this specification;

[0024] Figure 2This is a schematic diagram of the three-dimensional structure of the pump head pressure block;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of a ring cam;

[0026] Figure 4a Schematic diagram of the three-dimensional structure of the extrusion unit Figure 1 ;

[0027] Figure 4b Schematic diagram of the three-dimensional structure of the extrusion unit Figure 2 ;

[0028] Figure 5 This is a three-dimensional structural diagram of the extrusion block 21;

[0029] Figure 6 This is a three-dimensional structural diagram of the extrusion block 22;

[0030] Figure 7 This is a three-dimensional structural diagram of the extrusion block 23;

[0031] In the diagram: 1. Pump head pressure block; 11. L-shaped slot; 12. Groove; 13. Guide groove; 2. Extrusion unit; 21. Extrusion block; 22. Extrusion block; 23. Extrusion block; 3. Annular cam assembly; 31. Annular cam; 32. Annular cam; 33. Annular cam; 4. Rotary drive shaft; 5. Drive base plate; 6. Driver; 7. Spring. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] The rotary peristaltic pump provided in this specification includes: a rotary drive shaft, an annular cam, a pressing unit, and a pump head block. A hose is placed between the pressing unit and the pump head block. The rotary drive shaft drives the annular cam to rotate, and the pressing unit performs linear reciprocating motion under the drive of the annular cam to press the hose.

[0034] A rotary drive shaft can be understood as a shaft that drives an actuator to rotate, allowing the actuator to rotate at different angular velocities. Most rotary drive shafts are linear circular shafts.

[0035] A ring cam can be understood as a hollow circular ring with varying heights. A rotary drive shaft rotates the ring cam. There are usually multiple ring cams arranged in a nested configuration, with larger rings nested around smaller ones. The rotary drive shaft drives one ring cam, which then drives the others.

[0036] The pressing unit, located above the annular cam, is used to squeeze the hose placed between the pump head pressure block and the pressing unit, driven by the annular cam. The pressing unit performs a linear reciprocating motion, squeezing the liquid inside the hose by pressing and releasing it.

[0037] Understandably, there can be one or more pressing units.

[0038] In this design, the pump head clamp is fixed in position to prevent the hose from shifting. Additionally, to facilitate hose installation, the pump head clamp has an L-shaped slot at its bottom. The hose passes through this slot into the pump head clamp. One straight arm of the slot is used to insert the hose, while the other straight arm secures the hose, preventing it from detaching from the pump head clamp.

[0039] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0040] Example 1

[0041] like Figure 1 As shown, the rotary peristaltic pump includes: a pump head block 1, a pressing unit 2, an annular cam assembly 3, and a rotary drive shaft 4. A hose is placed between the pressing unit 2 and the pump head block 1. The rotary drive shaft 4 drives the annular cam assembly 3 to rotate. The pressing unit performs linear reciprocating motion under the drive of the annular cam to press the hose.

[0042] Among them, the annular cam assembly 3 consists of rings with holes in the center and different axial heights. The annular cam assembly 3 includes at least two annular cams. Figure 1 There are three annular cams nested together, and at least two of the annular cams have different protrusion positions. Correspondingly, the pressing unit 2 includes at least two pressing blocks. If there are three annular cams, there are also three pressing blocks. One annular cam is used to drive only one pressing block.

[0043] In this embodiment, the rotary drive shaft 4 is located in the middle of the annular cam group 3. When the rotary drive shaft 4 rotates, it will first drive the innermost annular cam to rotate, and then drive the outermost annular cam to rotate.

[0044] like Figure 1As shown, a spring 7 is provided between the pressing unit 2 and the pump head pressing block 1, and a spring hole is provided on the pressing block of the pressing unit 2. The spring 7 is placed in the spring hole for quick reset of the pump head pressing block 1.

[0045] like Figure 1 As shown, an L-shaped groove 11 is formed on the top of the pump head pressure block 1 along the direction of the hose. The hose passes through the L-shaped groove 11 into the pump head pressure block 1 and is fixed by the L-shaped groove 11. The L-shaped groove 11 facilitates the installation and fixation of the hose and improves the convenience of hose installation.

[0046] like Figure 2 As shown, the pump head pressure block 1 has a groove 12 inside (the pump head pressure block 1 is a box), and a guide groove 13 is provided on the side wall of the pump head pressure block 1. The extrusion block moves along the guide groove 13.

[0047] like Figure 1 As shown, the rotary extrusion peristaltic pump also includes: a drive base plate 5 and a driver 6; the drive base plate 5 is provided with threaded holes around its perimeter for fixed connection with the pump head block 1, and correspondingly, threaded holes or through holes are also provided on the end face of the pump head block 1.

[0048] like Figure 3 As shown, the annular cam assembly 3 includes three annular cams: annular cam 31, annular cam 32, and annular cam 33. The three annular cams are nested together and can be linked. Specifically, in this figure, annular cam 33 has a central hole for the rotary drive shaft 4 to pass through. When the rotary drive shaft 4 drives annular cam 33 to rotate, annular cam 33 drives annular cam 32 to rotate via a linkage mechanism. Similarly, annular cam 32 drives annular cam 31 to rotate via a linkage mechanism.

[0049] like Figure 3 As shown, the linkage structure can have a protrusion on the side of the annular cam 33 and a groove on the side of the annular cam 32. The protrusion can move within the groove, and when the protrusion rotates to the two ends of the groove, the annular cam 33 and the annular cam 32 will be linked. Similarly, the linkage structure of the annular cam 32 and the annular cam 31 is also the same.

[0050] It should be noted that the relative positions of the annular cams 31, 32, and 33 are different when the rotary drive shaft 4 rotates forward and backward. That is, the position of the side protrusion of the annular cam 33 in the groove of the annular cam 32 is different, and the position of the side protrusion of the annular cam 32 in the groove of the annular cam 31 is also different.

[0051] like Figure 3As shown, each annular cam is a 360-degree ring, and the height of each part of the ring is different, meaning it includes at least one protruding part. It should be explained that the protruding part of the annular cam can be understood as the highest point of the annular cam, and the central angle corresponding to the protruding part is the central angle corresponding to the highest point of the annular cam.

[0052] Corresponding to the annular cam structure, such as Figure 4a and Figure 4b As shown, the extrusion unit 2 includes extrusion block 21, extrusion block 22 and extrusion block 23, and annular cam 31, annular cam 32 and annular cam 33 are used to lift extrusion block 21, extrusion block 22 and extrusion block 23 respectively.

[0053] It should be noted that the height of the annular cam and the extrusion block it drives is a constant. That is, the height of the annular cam 31 and the extrusion block 21 is a constant, the height of the annular cam 32 and the extrusion block 22 is a constant, and the height of the annular cam 33 and the extrusion block 23 is a constant. This ensures that the upper surfaces of the extrusion blocks 21, 22 and 23 are on the same horizontal plane.

[0054] In this embodiment, the three annular cams are at the same height, and the three extrusion blocks are at the same height. In other embodiments, the annular cams can be set to different heights, and the heights of the corresponding extrusion blocks will also change.

[0055] like Figure 4b As shown, to facilitate the lifting of the extrusion block, a protrusion is also provided at the bottom of the extrusion block, and the annular cam lifts the extrusion block through the protrusion. In this way, both the annular cam and the extrusion block are provided with protrusions, and the protrusion of the annular cam lifts the protrusion of the extrusion block, resulting in a small contact area and low friction.

[0056] like Figure 4b As shown, since the annular cam is rotating and its protrusion is also fan-shaped, the cross-section of the protrusion of the extrusion block is also fan-shaped in order to match the protrusion of the annular cam.

[0057] It should be noted that the sum of the central angles corresponding to the protrusions of the three annular cams and the central angles corresponding to the protrusions of the three extrusion blocks is greater than 360 degrees. Preferably, the sum of the central angles corresponding to the protrusions of the three annular cams is greater than 360 degrees. It should be explained that the protruding part of the annular cam can be understood as the highest point of the annular cam's height, and the central angle corresponding to the protrusion is the central angle corresponding to the highest point of the annular cam's height.

[0058] Based on the principle that "the sum of the heights of the annular cam and the extrusion block it drives is a constant," and since both the annular cam and the extrusion block have protrusions, the heights of the protrusions can be set separately. The heights of the protrusions can be set to different values.

[0059] like Figure 5-7 As shown, extrusion blocks 21 and 23 have an L-shaped structure and a symmetrical structure, while extrusion block 22 has a T-shaped structure. This arrangement can reduce friction on the vertical plane and improve smoothness.

[0060] Based on the above description, the squeezing block 22 can be configured as a working squeezing block, the squeezing block 21 as a liquid inlet stop block, and the squeezing block 23 as a liquid outlet stop block. The liquid inlet stop block is used to stop the liquid inlet of the hose, the liquid outlet stop block is used to stop the liquid outlet of the hose, and the working squeezing block is used to squeeze the hose to transfer liquid. The annular cam 32 is a squeezing cam, the annular cam 31 is a liquid inlet stop cam, and the annular cam 32 is a liquid outlet stop cam. Different annular cams are used to lift different squeezing blocks; for example, the squeezing cam, the liquid inlet stop cam, and the liquid outlet stop cam are used to lift the working squeezing block, the liquid inlet stop block, and the liquid outlet stop block, respectively.

[0061] Different annular cam shapes result in different sequences of movement of the squeezing blocks during rotation. By adjusting the shape of the annular cam, a series of operations such as cutting off the hose, suction, and discharge can be achieved.

[0062] Example 2

[0063] Unlike Embodiment 1, at least two annular cams have different protrusion heights, and at least two extrusion blocks have different heights. The annular cams can be configured to have different protrusion heights, or the base heights of the extrusion blocks can be different, or the protrusion heights of the extrusion blocks can be different.

[0064] Example 3

[0065] Unlike Embodiment 1, the rotary drive shaft is located on the outside of the annular cam. When the rotary drive shaft 4 rotates, it first drives the outermost annular cam to rotate, which in turn drives the inner annular cam to rotate.

[0066] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the device that includes said element.

[0067] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A rotary extrusion peristaltic pump, characterized in that, include: The device comprises a rotary drive shaft, an annular cam, a pressing unit, and a pump head block. A hose is positioned between the pressing unit and the pump head block. The rotary drive shaft rotates the annular cam, and the pressing unit reciprocates linearly under the drive of the annular cam to press the hose. The annular cam is a circular ring with a hole in the center and varying axial heights. There are at least two annular cams, nested within each other, with different protrusion positions. The rotary drive shaft drives one of the annular cams to rotate, which in turn drives the other annular cams to rotate.

2. The rotary extrusion peristaltic pump as described in claim 1, characterized in that, The pressing unit includes at least two pressing blocks, and a ring cam drives only one of the pressing blocks.

3. The rotary extrusion peristaltic pump as described in claim 1, characterized in that, The rotary drive shaft is located in the middle of the annular cam, or the rotary drive shaft is located on the outside of the annular cam.

4. The rotary extrusion peristaltic pump as described in claim 2, characterized in that, The height of the annular cam and the extrusion block it drives is a constant.

5. The rotary extrusion peristaltic pump as described in claim 2, characterized in that, The bottom of the extrusion block is provided with a protrusion, and the annular cam lifts the extrusion block through the protrusion.

6. The rotary extrusion peristaltic pump as described in claim 5, characterized in that, The cross-section of the protrusion is fan-shaped.

7. The rotary extrusion peristaltic pump as described in claim 2, characterized in that, A spring is provided between the pressing unit and the pump head pressure block, and a spring hole is provided on the pressing block.

8. The rotary extrusion peristaltic pump as described in claim 2, characterized in that, The pump head pressure block has a groove inside, and a guide groove is provided on the side wall of the pump head pressure block. The extrusion block moves along the guide groove.

9. The rotary extrusion peristaltic pump as described in claim 1, characterized in that, The top of the pump head pressure block has an L-shaped groove along the direction of the hose. The hose passes through the L-shaped groove into the pump head pressure block and is fixed by the L-shaped groove.

10. The rotary extrusion peristaltic pump as described in claim 2, characterized in that, There are three annular cams and three extrusion blocks, which are arranged in sequence as an inlet stop block, a working pressure block, and a drain stop block. When the three annular cams rotate, they lift the three extrusion blocks in a certain order.

11. The rotary extrusion peristaltic pump as described in claim 10, characterized in that, The working pressure block has a T-shaped structure, and the liquid inlet stop block and the liquid outlet stop block have an L-shaped structure.

12. The rotary extrusion peristaltic pump as described in claim 2, characterized in that, A limiting linkage structure is provided between adjacent annular cams, so that adjacent annular cams can move relative to each other within a certain range, and can achieve linkage after reaching the limiting position.

13. The rotary extrusion peristaltic pump as described in claim 10, characterized in that, The bottom of the extrusion block is provided with annular protrusions, and the central angles corresponding to the protrusions of the three annular cams and the sum of the central angles corresponding to the three annular protrusions are greater than 360 degrees.

14. The rotary extrusion peristaltic pump as described in claim 10, characterized in that, The annular cam consists of a squeezing cam, a liquid inlet stop cam, and a liquid outlet stop cam, arranged from the inside out. The squeezing cam is used to lift the working pressure block, the liquid inlet stop block, and the liquid outlet stop block, respectively.

15. The rotary extrusion peristaltic pump as described in claim 2, characterized in that, The protrusion heights of at least two of the annular cams are different, and the heights of at least two of the extrusion blocks are different.

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