Separable micro peristaltic pump and peristaltic pump set

Abstract

The separable micro peristaltic pump comprises a pump head assembly and a driving assembly which are detachably connected, and the driving assembly is used for driving at least part of the pump head assembly to rotate; the pump head assembly comprises a pump head base, a shell structure, a pump head rotor and a hose assembly, and the pump head rotor can rotate to extrude the hose assembly; the driving assembly comprises a support, a driving motor and a driven shaft structure. The driven shaft structure is detachably connected with the pump head rotor, and the driving motor drives the pump head rotor to rotate through the driven shaft structure. According to the design, precise assembly is not needed, and the pump head assembly and the driving assembly can be simply assembled in an opposite inserting mode. The micro peristaltic pump is particularly suitable for occasions with limited installation sizes, such as relatively low flow and sterile operation conditions, space experiment application and the like, and the pump head assembly can be independently installed in application equipment.

Description

Technical Field

[0001] The embodiments of the present invention relate to the fields of low-flow fluid transportation and sterile liquid transportation technology, specifically to a detachable micro peristaltic pump and a peristaltic pump assembly. Background Technology

[0002] A peristaltic pump works by reciprocating the compression of a tubing to drive fluid. Generally, peristaltic pumps have the following characteristics: the fluid being pumped, except for the tubing, does not come into contact with any other parts of the pump; it is isolated within the pump tubing and requires no special sealing devices, thus preventing leakage. Furthermore, the pump tubing of a peristaltic pump can be disassembled, installed, and sterilized independently. These features meet the aseptic fluid delivery requirements in industries such as medicine, biology, and food processing. Another important characteristic of peristaltic pumps is that when not in operation, the pump tubing is squeezed shut, acting like a closed valve.

[0003] The pump tube of the peristaltic pump is installed on the pump head. The pump head mainly consists of a rotor roller and a pump head housing. The pump tube is located between the rotor roller and the pump head housing. The motor of the peristaltic pump drives the rotor roller to rotate, and the roller reciprocates to squeeze the hose, driving the fluid flow.

[0004] In specialized applications, such as microfluidic systems, which are characterized by low flow rates, small system dimensions, and limited installation size, as well as space experimental systems, there are often stringent requirements for volume and size, low flow rates, and suitability for weightless environments. Traditional peristaltic pumps in these scenarios often suffer from short tubing lengths due to system size constraints, leading to significant installation inconvenience. Furthermore, while frequent replacement of the pump tubing and liquid samples is generally not a problem in ordinary applications, in some specialized settings, the pump head and tubing may need to be housed in dedicated equipment. Carrying the electrical drive and electronic control components hinders equipment movement and aseptic operation. Especially in environments like space experiments, where the drive and control systems typically need to be stationary in orbit, the pump tubing, liquid samples, pump head, and the sample unit housing them require frequent replacement.

[0005] Therefore, there is an urgent need for a separable micro peristaltic pump that allows the pump tubing, pump head system, and the dedicated equipment for mounting them to operate separately from the drive and control system, and that can be easily assembled together when needed. Summary of the Invention

[0006] To address this, embodiments of the present invention provide a separable micro peristaltic pump and peristaltic pump assembly. By detachably assembling the pump head assembly and the drive assembly, and further introducing a driven shaft structure, it is possible to achieve personalized combination design of the pipeline system in which the peristaltic pump is located, thus solving the application requirements of the prior art under conditions such as limited installation size, pump head separation operation, and clean operation requirements.

[0007] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0008] In one aspect of the present invention, a detachable micro peristaltic pump is provided, comprising a detachably connected pump head assembly and a drive assembly, the drive assembly being used to drive at least a portion of the pump head assembly to rotate; wherein...

[0009] The pump head assembly includes at least a pump head base, a housing structure mounted on the pump head base and having an internal receiving cavity, a pump head rotor rotatably disposed in the receiving cavity and forming a hose mounting channel between the rotor and the inner wall of the housing structure, and a hose assembly penetrating the hose mounting channel and extending to the outside of the housing structure, wherein rotation of the pump head rotor can compress the hose assembly.

[0010] The drive assembly includes at least a bracket, a drive motor mounted on the bracket, and a driven shaft structure mounted on the motor shaft of the drive motor.

[0011] The driven shaft structure is detachably connected to the pump head rotor, and the drive motor drives the pump head rotor to rotate through the driven shaft structure.

[0012] In a preferred embodiment of the present invention, the housing structure includes a pump head housing mounted on the pump head base and having a pipe inlet / outlet formed through its side, and a pump head cover disposed on the upper surface of the pump head housing; wherein,

[0013] The pump head base is provided with a first rotation limiting member, the pump head cover is provided with a second rotation limiting member, and the two ends of the pump head rotor are respectively installed on the first rotation limiting member and the second rotation limiting member. The central axis of the first rotation limiting member, the pump head rotor, the second rotation limiting member and the pump head housing are located on the same straight line.

[0014] As a preferred embodiment of the present invention, a locking hole is formed on the side wall of the pump head housing, and a locking protrusion and a limiting protrusion are also formed on the side wall of the pump head cover. The locking protrusion can be fastened to the locking hole, and the limiting protrusion is partially fitted with the pipe inlet and outlet from top to bottom.

[0015] As a preferred embodiment of the present invention, the driven shaft structure includes a non-shaped shaft fixedly disposed on the motor shaft, a non-shaped hole connected to the bottom of the pump head rotor, and the non-shaped shaft and the non-shaped hole can be inserted into each other.

[0016] When the irregular shaft is inserted into the irregular hole, the irregular shaft is located at a set initial angle relative to the irregular hole.

[0017] As a preferred embodiment of the present invention, when the irregular shaft is inserted into the irregular hole, there is a gap between the outer surface of the irregular shaft and the inner surface of the irregular hole.

[0018] As a preferred embodiment of the present invention, the pump head base is provided with a groove mark, and the irregular hole is provided with a notch mark. The groove mark and the notch mark cooperate to indicate the initial angular position of the pump head rotor.

[0019] As a preferred embodiment of the present invention, a position detection element is also fixedly disposed on the bracket, and a signal triggering element is installed on the driven shaft structure. The position detection element and the signal triggering element cooperate to position the relative position of the driven shaft structure and the bracket.

[0020] In a preferred embodiment of the present invention, the cross-section of the hose installation channel is U-shaped;

[0021] The hose assembly includes at least one pump tube, which is embedded in the U-shaped hose mounting channel.

[0022] In another aspect of the present invention, a peristaltic pump assembly is also provided, including a detachably mounted working base and a working surface, and the aforementioned detachable micro peristaltic pump; wherein,

[0023] The working base has multiple first placement holes, and the working table has multiple second placement holes. A first placement hole and a second placement hole cooperate to form a placement hole group, and each placement hole group can install one of the detachable micro peristaltic pumps.

[0024] In a preferred embodiment of the present invention, the bracket is fixedly installed in the first placement hole, and the pump head base is fixedly installed in the second placement hole.

[0025] The embodiments of the present invention have the following advantages:

[0026] The pump head assembly and drive assembly are completely separable. The pump head assembly can be designed and installed in any mobile application device, requiring only a mechanical interface with the drive assembly. This facilitates customized design of the piping system used with the peristaltic pump. The pump head assembly and its hose assembly can be assembled, transported, and stored independently of the drive assembly. Furthermore, by introducing a driven shaft structure, the pump head assembly and drive assembly can be assembled with a simple plug-and-play operation when needed. The hose assembly is internally compatible with multi-line pump tubing installation. Based on these design features, the entire structure is particularly suitable for relatively low-flow liquid drive applications with limited installation space, pump head separation operation, and clean operation requirements, effectively adapting to low-flow liquid management in space experiments and other similar settings. Attached Figure Description

[0027] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0028] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0029] Figure 1 This is a schematic diagram of the structure of a detachable micro peristaltic pump provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the detachable micro peristaltic pump in its detached state, provided in an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the pump head assembly provided in an embodiment of the present invention;

[0032] Figure 4 This is an exploded view of the pump head assembly provided in an embodiment of the present invention;

[0033] Figure 5 This is an exploded view of the pump head assembly provided in an embodiment of the present invention from another perspective;

[0034] Figure 6 This is a schematic diagram of the structure of the pump head base and pump head rotor provided in an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of one type of pump head rotor provided in an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of the structure of the driving component provided in an embodiment of the present invention;

[0037] Figure 9 This is an exploded view of the driving component provided in an embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of the peristaltic pump assembly provided in an embodiment of the present invention;

[0039] Figure 11 This is a schematic diagram of the peristaltic pump assembly in the separated state provided in an embodiment of the present invention.

[0040] In the picture:

[0041] 1-Pump head assembly; 2-Drive assembly; 3-Worktable; 4-Work base;

[0042] 11-Pump head base; 12-Pump head housing; 13-Pump head rotor; 14-Pump head cover; 15-First rotation limiter; 16-Second rotation limiter; 17-Pump pipe; 18-Receiving cavity;

[0043] 111 - Groove mark;

[0044] 121 - Pipe inlet / outlet; 122 - Clip;

[0045] 131 - Irregular hole; 132 - Notch mark;

[0046] 141 - Limiting protrusion; 142 - Locking protrusion;

[0047] 21-Bracket; 22-Irregular-shaped shaft; 23-Drive motor; 24-Motor mounting plate; 25-Signal trigger element; 26-Position detection element;

[0048] 221-Flange; 222-Magnetic hole;

[0049] 231 - Motor shaft. Detailed Implementation

[0050] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] This invention provides a detachable micro peristaltic pump, such as Figure 1 and Figure 2 As shown, this detachable miniature peristaltic pump consists of a pump head assembly 1 and a drive assembly 2, which are detachably connected. The pump head assembly 1 is a purely structural component used to house the pump tubing 17. Specifically, as... Figures 3-7As shown, the pump head assembly 1 includes a pump head base 11, a pump head housing 12, a pump head rotor 13, a pump head cover 14, a first rotation limiting member 15 (which can be a bearing), a second rotation limiting member 16 (which can be a bearing), and a pump pipe 17 (which is a flexible hose). The pump head housing 12 and the pump head cover 14 cooperate to form a receiving cavity 18. When the pump head rotor 13 is located in the receiving cavity 18, they cooperate to form a flexible hose mounting channel for placing the pump pipe 17. The drive assembly 2 is used to drive the pump head rotor 13 to rotate. Specifically, as shown... Figure 8 and 9 As shown, it includes a bracket 21 for mounting and fixing the pump head assembly 1, a non-circular shaft 22 (e.g., a square shaft), a drive motor 23, a signal triggering element 25 (e.g., a magnet can be selected), a motor mounting plate 24, and a position detection element 26 (e.g., a Hall switch can be selected) for initial angle positioning of the square shaft.

[0052] In drive assembly 2, drive motor 23 is fixed to bracket 21 by motor mounting plate 24. A non-circular shaft 22 is fixed to motor shaft 231, and the non-circular shaft 22 has a flange 221. A signal trigger element 25 is installed in a magnetic hole 222 on the edge of flange 221. A position detection element 26 is installed on motor mounting plate 24 below flange 221. The distance between position detection element 26 and the axis of drive motor 23 is equal to the radius of rotation of signal trigger element 25 around axis of drive motor 23. Therefore, when drive motor 23 drives non-circular shaft 22 to rotate, position detection element 26 generates a feedback signal whenever signal trigger element 25 passes above position detection element 26. This feedback signal can be used to control drive motor 23 to stop, thus stopping non-circular shaft 22 at a set angle. This positioning and stopping function is used for the alignment and installation of pump head assembly 1 and drive assembly 2.

[0053] The bottom of the pump head rotor 13 of the pump head assembly 1 has a corresponding irregular hole 131. When the direction of the irregular hole 131 is consistent with the stopping direction of the irregular shaft 22 of the drive assembly 2, the irregular shaft 22 can be inserted into the irregular hole 131 in the pump head rotor 13. At this time, the pump head assembly 1 can be installed on the bracket 21 of the drive assembly 2.

[0054] To ensure that the irregular hole 131 of the pump head rotor 13 aligns with the parking direction of the irregular shaft 22 of the drive assembly 2 during the assembly of the pump head assembly 1 and the drive assembly 2, a notch mark 132 is provided next to the irregular hole 131 at the bottom of the pump head rotor 13, and a groove mark 111 is also provided at the bottom of the pump head base 11. These two marks are used to set the initial angular position of the pump head rotor 13 after the pump head piping is installed. The initial angular position of the pump head rotor 13 is defined when the two marks are aligned on the same side. Similarly, the initial angular position of the irregular shaft 22 of the drive assembly 2 is defined after the signal trigger element 25 and the position detection element 26 are aligned. At this time, the irregular hole 131 of the pump head rotor 13 is parallel to the four sides of the irregular shaft 22 of the drive assembly 2. Since the dimensions of the irregular hole 131 are larger than those of the irregular shaft 22, no precise fit is required, and the irregular shaft 22 can be easily inserted into the irregular hole 131 for assembly.

[0055] The above measures ensure easy installation between the pump head assembly 1 and the drive assembly 2. However, the rotation of the pump head rotor 13 requires centering to evenly compress the pump tube 17. This centering function is provided by the first rotation limiting member 15 and the second rotation limiting member 16 on the pump head assembly 1. The first rotation limiting member 15 is installed between the pump head base 11 and the pump head housing 12, coinciding with the axis of the pump head housing 12. The lower half of the pump head rotor 13 is fitted with the first rotation limiting member 15. When the pump tube 17 is installed between the pump head rotor 13 and the pump head housing 12, the second rotation limiting member 16 is already installed at the center of the pump head cover 14. The pump head cover 14 is provided with a limiting protrusion 141 and a locking protrusion 142. The limiting protrusion 141 has the same width as the pipe inlet / outlet 121 on the pump head housing 12. When the pump head cover 14 is pressed down with a little force, the second rotation limiting member 16 engages with the pump head rotor 13. The protrusion on the locking protrusion 142 engages with the locking hole 122 on the pump head housing 12 (the plate surface with the locking hole 122 is an elastic plate surface, which can be gently pried open to remove the pump head cover 14). The limiting protrusion 141 engages with the pump pipe inlet / outlet 121 on the pump head housing 12. At this time, the movement of the pump head cover 14 in the front-back, left-right, and up-down directions is restricted, and thus it is fixed. The axes of the second rotation limiting member 16, the pump head rotor 13, and the first rotation limiting member 15 coincide. Therefore, when the pump head rotor 13 rotates, the axis is determined by the second rotation limiting member 16 and the first rotation limiting member 15, and no offset will occur.

[0056] After the pump head assembly 1 is mounted and fixed on the drive assembly 2, when the drive motor 23 starts, it drives the pump head rotor 13 to rotate via the shaped shaft 22. The pump tube 17 is continuously squeezed between the pump head rotor 13 and the pump head housing 12, thus driving fluid flow. The bottom of the pump head rotor 13 is embedded in the first rotation limiting member 15, and the top is embedded in the second rotation limiting member 16. The first rotation limiting member 15 and the second rotation limiting member 16 ensure that the axes of the pump head rotor 13 and the pump head housing 12 are aligned and coincident, ensuring uniform squeezing of the pump tube 17. As shown above, there is a large tolerance clearance between the shaft hole fit between the pump head assembly 1 and the drive assembly 2, resulting in high assembly tolerance and easy installation. The drive motor 23 and the shaped shaft 22 only serve to drive the rotation of the pump head rotor 13. The function of precisely aligning the axes of the pump head rotor 13 and the pump head housing 12 is integrated into the pump head assembly 1 through the second rotation limiting member 16 and the first rotation limiting member 15, and does not depend on the drive assembly 2. Therefore, it satisfies the convenience of assembly between pump head assembly 1 and drive assembly 2, the reliability of drive transmission between the two, and the stability of the rotation axis of pump head rotor 13.

[0057] One or more pump tubes 17 can be installed inside the pump head assembly 1 as needed for single or multiple liquid delivery. The pump tube 17 can be installed on the pump head assembly 1 after sterilization and solution loading. It and other parts of the pump head assembly 1 are passive components and can be assembled in a clean bench completely independently of the electrical and cable parts of the drive assembly 2.

[0058] Multiple pump tubes 17 can be installed inside the pump head assembly 1. When the diameter of the multiple pump tubes 17 is the same, they can be installed side by side from top to bottom, and the rotation of the pump head rotor 13 can simultaneously squeeze the multiple pump tubes 17; when the inner diameter of the multiple pump tubes 17 is not completely consistent but the difference is not significant, the wall thickness of the multiple pump tubes 17 can be made the same, and the rotation of the pump head rotor 13 can also simultaneously squeeze the multiple pump tubes 17 with different inner diameters.

[0059] The present invention also provides a peristaltic pump assembly, for example, in a specific embodiment, such as... Figure 10 and Figure 11As shown, the system consists of a worktable 3 and a base 4. The worktable 3 needs frequent replacement and must be assembled within a clean bench. Three pump head assemblies 1 are required within the worktable 3 to form the sample supply system; therefore, the worktable 3 and base 4 need to be operable separately. The worktable 3 can be assembled and filled with liquid independently within the clean bench, including installing the corresponding pump tubing 17, thus constructing a closed-loop liquid supply system within the worktable 3. The base 4 is equipped with three motors driving three square shafts, all of which can be initialized via Hall effect switch feedback signals. Once all pump head assemblies 1 and square shafts of the base 4 within the worktable 3 have been initialized, the worktable 3 can be easily assembled by simply plugging it into the base 4. The drive motor 23 of the base 4 then drives the pump head assemblies 1 to function as a peristaltic pump.

[0060] Based on the above design, in actual operation, the length, width, and height dimensions of the pump head assembly 1 can be controlled within a 21*21*17mm envelope, occupying minimal space. This design can be effectively applied to relatively low-flow liquid drive applications where installation size is limited and pump head separation and clean operation requirements are necessary, making it suitable for low-flow liquid management in space experiments and other similar settings.

[0061] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A detachable micro peristaltic pump, characterized in that, It includes a detachably connected pump head assembly (1) and a drive assembly (2), the drive assembly (2) being used to drive at least a portion of the pump head assembly (1) to rotate; wherein, The pump head assembly (1) includes at least a pump head base (11), a housing structure mounted on the pump head base (11) and having a receiving cavity (18) inside, a pump head rotor (13) rotatably disposed in the receiving cavity (18) and forming a hose mounting channel between the rotor (13) and the inner wall of the housing structure, and a hose assembly passing through the hose mounting channel and extending to the outside of the housing structure. The pump head rotor (13) can squeeze the hose assembly when it rotates. The drive assembly (2) includes at least a bracket (21), a drive motor (23) disposed on the bracket (21), and a driven shaft structure mounted on the motor shaft (231) of the drive motor (23); The driven shaft structure is detachably connected to the pump head rotor (13), and the drive motor (23) drives the pump head rotor (13) to rotate through the driven shaft structure.

2. The detachable micro peristaltic pump according to claim 1, characterized in that, The housing structure includes a pump head housing (12) mounted on the pump head base (11) and having a pipe inlet / outlet (121) formed through its side, and a pump head cover (14) covering the upper surface of the pump head housing (12); wherein, A first rotation limiting member (15) is provided on the pump head base (11), and a second rotation limiting member (16) is provided on the pump head cover (14). The two ends of the pump head rotor (13) are respectively installed on the first rotation limiting member (15) and the second rotation limiting member (16). The central axes of the first rotation limiting member (15), the pump head rotor (13), the second rotation limiting member (16) and the pump head housing (12) are located on the same straight line.

3. A detachable micro peristaltic pump according to claim 2, characterized in that, A locking hole (122) is formed on the side wall of the pump head housing (12), and a locking protrusion (142) and a limiting protrusion (141) are also formed on the side wall of the pump head cover (14). The locking protrusion (142) can be fastened to the locking hole (122), and the limiting protrusion (141) is partially fitted with the pipe inlet / outlet (121) from top to bottom.

4. A detachable micro peristaltic pump according to any one of claims 1-3, characterized in that, The driven shaft structure includes a non-shaped shaft (22) fixedly mounted on the motor shaft (231), a non-shaped hole (131) connected to the bottom of the pump head rotor (13), and the non-shaped shaft (22) and the non-shaped hole (131) can be inserted into each other. When the irregular shaft (22) is inserted into the irregular hole (131), the irregular shaft (22) is located at a set initial angle relative to the irregular hole (131).

5. A detachable micro peristaltic pump according to claim 4, characterized in that, When the irregular shaft (22) is inserted into the irregular hole (131), there is a gap between the outer surface of the irregular shaft (22) and the inner surface of the irregular hole (131).

6. A detachable micro peristaltic pump according to claim 4, characterized in that, The pump head base (11) is provided with a groove mark (111), and the irregular hole (131) is provided with a notch mark (132). The groove mark (111) and the notch mark (132) cooperate to indicate the initial angular position of the pump head rotor (13).

7. A detachable micro peristaltic pump according to any one of claims 1-3, characterized in that, A position detection element (26) is also fixedly installed on the bracket (21), and a signal triggering element (25) is installed on the driven shaft structure. The position detection element (26) and the signal triggering element (25) cooperate to position the relative position of the driven shaft structure and the bracket (21).

8. A detachable micro peristaltic pump according to any one of claims 1-3, characterized in that, The cross-section of the hose installation channel is U-shaped; The hose assembly includes at least one pump tube (17) which is embedded in the U-shaped hose mounting channel.

9. A peristaltic pump assembly, characterized in that, It includes a detachable working base (4) and a working surface (3), and a separable micro peristaltic pump according to any one of claims 1-8; wherein, The working base (4) has a plurality of first placement holes, and the working table (3) has a plurality of second placement holes. A first placement hole and a second placement hole cooperate to form a placement hole group, and each placement hole group can install one of the detachable micro peristaltic pumps.

10. A peristaltic pump assembly according to claim 9, characterized in that, The bracket (21) is fixedly installed in the first placement hole, and the pump head base (11) is fixedly installed in the second placement hole.

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