Miniature peristaltic pump

Abstract

The utility model relates to a micro peristaltic pump, and relates to the technical field of peristaltic pumps, the micro peristaltic pump comprises a driving device, a shell, a top cover and two liquid passing pipes arranged on the outer side of the top cover, the shell and the top cover are clamped, and a mounting cavity is formed in the shell and the top cover; a speed reducing device and a peristaltic device are arranged in the mounting cavity, the peristaltic device is connected with the speed reducing device, and the peristaltic device is communicated with the two liquid passing pipes; the speed reduction equipment comprises a first-stage planetary gear assembly, a second-stage planetary gear assembly, a first-stage inner gear ring and a second-stage inner gear ring, wherein the first-stage planetary gear assembly and the second-stage planetary gear assembly are fixedly connected, the first-stage inner gear ring is meshed with the outside of the first-stage planetary gear assembly, and the second-stage inner gear ring is meshed with the outside of the second-stage planetary gear assembly. The inside of the first-stage planetary gear assembly is meshed with a driving gear at the output end of the driving equipment. The application has the effect of improving the reliability and practicability of a product with a small flow demand during use.

Description

Technical Field

[0001] The present application relates to the technical field of peristaltic pumps, and in particular to a micro peristaltic pump. Background Art

[0002] When using small electronic products such as curling irons, electric irons and steam combs, they usually require a small flow pump to achieve the pumping function. The minimum flow rate of the more common peristaltic pumps on the market is about 1.6~3ml, which does not meet the market demand for small electronic products. Therefore, the existing technology usually uses a 3ml peristaltic pump to modulate the pulse width through an external control board to achieve a small flow pumping function.

[0003] When implementing the technical solution of pulse width modulation of the peristaltic pump external control board, it was found through repeated tests that occasional failure to start may occur during use. The main reason is that while reducing the flow rate of the peristaltic pump through pulse width modulation, it is not possible to match the torque required by the product, which may cause the peristaltic pump to be blocked. The pulse width modulation process will also affect the working stability of the product and easily cause uneven discharge of the peristaltic pump. At the same time, since the overall size of the 3ml peristaltic pump is relatively large after the external control board is connected, the overall size of small electronic products will not be miniaturized enough. This will affect the reliability and practicality of products with small flow requirements when in use. Utility Model Content

[0004] The purpose of this application is to provide a micro peristaltic pump to improve the reliability and practicality of products with small flow requirements during use.

[0005] In the first aspect, the present application provides a micro peristaltic pump adopting the following technical solution:

[0006] A micro peristaltic pump comprises a driving device, a housing, a top cover and two liquid passages arranged outside the top cover, wherein the housing and the top cover are clamped and form a mounting cavity inside; a deceleration device and a peristaltic device are arranged in the mounting cavity, the peristaltic device is connected to the deceleration device, and the peristaltic device is connected to the two liquid passages;

[0007] The reduction device includes a first-stage planetary gear assembly and a second-stage planetary gear assembly that are fixedly connected, a first-stage internal gear ring meshing with the outside of the first-stage planetary gear assembly, and a second-stage internal gear ring meshing with the outside of the second-stage planetary gear assembly, and the interior of the first-stage planetary gear assembly meshes with the driving gear at the output end of the driving device.

[0008] By adopting the above technical solution, the present application sets a driving gear at the output end of the driving device, drives the reduction device by meshing the driving gear with the primary planetary gear assembly, drives the peristaltic device to perform low-speed peristalsis through the reduction effect of the reduction device, and the two liquid pipes are used as the liquid inlet pipe and the liquid outlet pipe respectively. Due to the low-speed peristalsis of the peristaltic device, a small flow rate output of the liquid outlet pipe is achieved, thereby meeting the small flow rate requirements of the product. The present application does not require pulse width modulation through an external control board, which can effectively save the installation space of the peristaltic pump, and at the same time improve the reliability and practicality of products with small flow rate requirements when in use.

[0009] Furthermore, the first-stage planetary gear assembly includes a first-stage planetary bracket, a through hole is provided in the middle of the first-stage planetary bracket, and the driving gear at the output end of the driving device passes through the through hole;

[0010] The first-stage planetary gear assembly also includes a plurality of first-stage planetary gears arranged around the through hole, the interiors of the plurality of first-stage planetary gears are meshed with the driving gear, and the exteriors of the plurality of first-stage planetary gears are meshed with the first-stage inner gear ring.

[0011] By adopting the above technical solution, the present application meshes the first-stage planetary gear with the driving gear. When the output end of the driving device rotates, it drives the driving gear to rotate while driving the first-stage planetary gear to rotate in the opposite direction. Through the gear meshing, the driving device can drive the reduction device, which has the advantages of high transmission efficiency, reliable connection and fastening, simple structure and low manufacturing cost.

[0012] Furthermore, a driving bracket is provided on the top of the driving device, and the bottom of the primary inner gear ring is clamped with the driving bracket.

[0013] By adopting the above technical solution, the first-stage internal gear ring of the present application is fixedly connected to the driving bracket. When the first-stage planetary gear rotates driven by the driving gear, the first-stage internal gear ring is fixed, thereby driving the first-stage planetary bracket to rotate in the same direction as the driving gear. Since the transmission ratios of the driving gear, the first-stage planetary gear and the internal gear ring are different, the output rotation speed is also different, thereby achieving a first-stage deceleration and ensuring the reliability of the deceleration equipment.

[0014] Further, the secondary planetary gear assembly includes a plurality of secondary planetary gears, the plurality of secondary planetary gears are fixedly connected to the plurality of primary planetary gears in a one-to-one correspondence, and the exteriors of the plurality of secondary planetary gears are meshed with the secondary inner gear ring;

[0015] The secondary planetary gear assembly also includes a secondary planetary support that is clamped with the primary planetary support.

[0016] By adopting the above-mentioned technical solution, the secondary planetary gear of the present application is fixedly connected to the primary planetary gear. Therefore, when the primary planetary gear rotates, the secondary planetary gear also rotates synchronously, thereby driving the secondary inner ring gear meshing with the secondary planetary gear to rotate in the opposite direction, thereby realizing secondary deceleration, ensuring the reliability of the deceleration equipment, and improving the stability of the peristaltic pump operation.

[0017] Furthermore, a plurality of connecting rods are provided at the top of the first-stage planetary bracket, and a plurality of connecting holes are provided at the bottom of the second-stage planetary bracket. The connecting rods are used to be inserted into the connecting holes to enable the first-stage planetary bracket to be clamped with the second-stage planetary bracket.

[0018] By adopting the above technical solution, the first-stage planetary bracket and the second-stage planetary bracket of the present application are connected by connecting rods and connecting holes, which is convenient for installation and disassembly, thereby improving the production efficiency and practicality of the peristaltic pump.

[0019] Furthermore, the deceleration device also includes a protective shell, and the bottom of the protective shell is clamped with the driving bracket.

[0020] By adopting the above technical solution, the present application sets a protective shell on the outside of the first-stage inner gear ring and the second-stage inner gear ring, which can protect and soundproof the deceleration equipment and improve the practicality of the peristaltic pump.

[0021] Furthermore, the peristaltic device includes a pump tube connecting two liquid passages and an extrusion assembly connected to a speed reduction mechanism, and the pump tube surrounds the outside of the extrusion assembly.

[0022] By adopting the above technical solution, the present application squeezes the pump tube through the extrusion component to change the liquid flow rate flowing through the pump tube, thereby ensuring the stability of the peristaltic pump.

[0023] Furthermore, the extrusion assembly includes a first connecting seat, the middle of which is cross-hollowed and extends upward to form a central column;

[0024] A cross connecting column is provided on the top of the secondary inner gear ring, and the cross connecting column is used to be inserted into the cross hollow to clamp the secondary inner gear ring with the first connecting seat.

[0025] By adopting the above technical solution, the present application clamps the secondary inner gear ring and the first connecting seat, and when the secondary inner gear ring rotates, the extrusion assembly is driven to rotate synchronously, thereby ensuring the stability of the peristaltic pump.

[0026] Furthermore, the extrusion assembly further comprises a plurality of extrusion columns arranged around the central column and a second connection seat fixedly connected to the tops of the plurality of extrusion columns;

[0027] A central clamping block is provided in the middle of the second connecting seat extending downward, and the central clamping block is used to be inserted into the cross hollow of the central column to clamp the second connecting seat with the first connecting seat.

[0028] By adopting the above-mentioned technical solution, the present application connects the first connecting seat and the second connecting seat by clamping. When the first connecting seat rotates, it drives the second connecting seat and the extrusion column to rotate synchronously, so that the extrusion column squeezes the pump tube, and the pump tube forms a negative pressure chamber and is then squeezed out through the extrusion column. The reciprocating cycle realizes the pumping function and ensures the stability of the peristaltic pump.

[0029] Furthermore, a clamping ring is provided on the outer side of the top cover, and a clamping block is provided on the outer side of the outer shell. The clamping block is used to be clamped into the clamping ring to clamp the top cover and the outer shell.

[0030] By adopting the above technical solution, the top cover and the outer shell of the present application are clamped together by the clamping ring and the clamping block, which facilitates the installation and disassembly of the external structure of the peristaltic pump and improves the production efficiency and practicality of the peristaltic pump.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. This application sets a driving gear at the output end of the driving device, drives the reduction device by meshing the driving gear with the primary planetary gear assembly, and drives the peristaltic device to perform low-speed peristalsis through the deceleration effect of the reduction device. The two liquid pipes serve as the liquid inlet pipe and the liquid outlet pipe respectively. Due to the low-speed peristalsis of the peristaltic device, a small flow rate output of the liquid outlet pipe is achieved, thereby meeting the small flow rate requirements of the product. This application does not require pulse width modulation through an external control board, which can effectively save the installation space of the peristaltic pump, and at the same time improve the reliability and practicality of products with small flow rate requirements when in use;

[0033] 2. The present application meshes the primary planetary gear with the driving gear. When the output end of the driving device rotates, the driving gear rotates and the primary planetary gear rotates in the opposite direction. The driving device can drive the reduction device through the gear meshing. The invention has the advantages of high transmission efficiency, reliable connection and fastening, simple structure and low manufacturing cost.

[0034] 3. The present application connects the first connecting seat and the second connecting seat by clamping. When the first connecting seat rotates, the second connecting seat and the extrusion column are driven to rotate synchronously, so that the extrusion column squeezes the pump tube, and the pump tube forms a negative pressure chamber and is then extruded through the extrusion column. The pumping function is realized by a reciprocating cycle, ensuring the stability of the peristaltic pump;

[0035] 4. The top cover and the outer shell of the present application are connected by a clamping ring and a clamping block, which facilitates the installation and disassembly of the external structure of the peristaltic pump and improves the production efficiency and practicality of the peristaltic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1It is a schematic diagram of the overall structure of an embodiment of the present application;

[0037] Figure 2 is a schematic diagram of the back structure of an embodiment of the present application;

[0038] Figure 3 is a schematic cross-sectional structural diagram of an embodiment of the present application;

[0039] Figure 4 is a schematic diagram of the structure of a driving device in an embodiment of the present application;

[0040] Figure 5 It is a schematic diagram of the structure of the deceleration device in an embodiment of the present application;

[0041] Figure 6 A schematic structural diagram of a first planetary gear assembly and a first outer gear ring according to an embodiment of the present application;

[0042] Figure 7 is a schematic structural diagram of a second planetary gear assembly and a second outer gear ring of an embodiment of the present application;

[0043] Figure 8 It is a schematic diagram of the structure of the peristaltic device in an embodiment of the present application;

[0044] Fig. 9 is a schematic diagram of the top structure of the second outer gear ring of an embodiment of the present application;

[0045] Fig.10 is a schematic diagram of the structure of the first connecting socket in an embodiment of the present application;

[0046] Fig.11 This is a schematic diagram of the second connecting seat and the extrusion column structure of an embodiment of the present application;

[0047] In the figure, 1, driving device; 11, driving bracket; 111, second clamping block; 112, first clamping hole; 12, driving gear; 2, housing; 21, first clamping block; 3, top cover; 31, clamping ring; 4, liquid pipe; 5, deceleration device; 51, protective shell; 511, clamping interface; 52, primary planetary gear assembly; 521, primary planetary bracket; 5211, through hole; 5212, connecting rod; 522, primary planetary gear; 53, secondary planetary gear assembly; 531 , secondary planetary bracket; 5311, connecting hole; 532, secondary planetary gear; 54, primary inner ring gear; 541, third clamping block; 55, secondary inner ring gear; 551, cross connecting column; 6, peristaltic device; 61, pump tube; 62, extrusion assembly; 621, first connecting seat; 6211, cross hollowing; 6212, center column; 6213, second clamping hole; 622, second connecting seat; 6221, center clamping block; 623, extrusion column; 6231, clamping part. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1 -Attached Fig.11 , further details of this application are given.

[0049] When implementing the technical solution of pulse width modulation of the peristaltic pump external control board, it was found through repeated tests that occasional failure to start may occur during use. The main reason is that while reducing the flow rate of the peristaltic pump through pulse width modulation, it is impossible to match the torque required by the product, which may cause the peristaltic pump to become blocked. The pulse width modulation process will also affect the working stability of the product and easily cause uneven liquid discharge from the peristaltic pump. At the same time, due to the large overall size of the 3ml peristaltic pump after the external control board is connected, the overall volume of small electronic products will not be miniaturized enough. This will affect the reliability and practicality of products with small flow requirements when in use. Therefore, the embodiment of the present application provides a miniature peristaltic pump, with reference to Figure 1 , Figure 2 and Figure 3 , comprising a driving device 1, a housing 2, a top cover 3 and two liquid-passing pipes 4 arranged outside the top cover 3. The housing 2 and the top cover 3 are clamped together by a first clamping structure, and a mounting cavity is formed inside. The first clamping structure comprises a clamping ring 31 arranged outside the top cover 3 and a first clamping block 21 outside the housing 2. The sizes of the clamping ring 31 and the first clamping block 21 match. The top cover 3 and the housing 2 are clamped together by clamping the first clamping block 21 into the clamping ring 31. In the specific implementation process, the driving device 1 can be a reduction motor, one of the two liquid-passing pipes 4 is a liquid inlet pipe, and the other is a liquid outlet pipe.

[0050] like Figure 3 As shown, a deceleration device 5 and a peristaltic device 6 are provided in the installation cavity, the deceleration device 5 is connected to the driving device 1, the peristaltic device 6 is connected to the deceleration device 5, and the peristaltic device 6 is connected to the two liquid pipes 4. Among them, the driving device 1 is used to drive the deceleration device 5 to work, the deceleration device 5 is used to transmit and decelerate, thereby driving the peristaltic device 6 to work, and the peristaltic device 6 is used to change the flow of the liquid inlet pipe and the liquid outlet pipe through peristalsis. Due to the deceleration effect of the deceleration device 5, the peristaltic device 6 peristsates at a low speed, realizing a small flow output of the liquid outlet pipe, thereby meeting the small flow demand of the product.

[0051] The implementation principle of the embodiment of the present application is: there is no need to perform pulse width modulation through an external control board, which can effectively save the installation space of the peristaltic pump and at the same time improve the reliability and practicality of products with small flow requirements during use.

[0052] like Figure 1 and Figure 4As shown, a driving bracket 11 is provided on the top of the driving device 1 of the embodiment of the present application, and the driving bracket 11 is fixedly connected to the housing 2 at both ends. The output shaft of the driving device 1 passes through the middle of the driving bracket 11, and a driving gear 12 is provided on the output shaft. When the driving device 1 is working, the output shaft rotates, causing the driving gear 12 to rotate. For example, the embodiment of the present application takes the clockwise rotation of the output shaft of the driving device 1 as an example, and the driving gear 12 also rotates clockwise.

[0053] like Figure 4 and Figure 5 As shown, the deceleration device 5 of the embodiment of the present application includes an external protective shell 51, and the bottom of the protective shell 51 is clamped with the driving bracket 11 through a second clamping structure. The second clamping structure includes four clamping interfaces 511 provided at the bottom of the protective shell 51 and a second clamping block 111 corresponding to the position of the clamping interface 511 and provided at the top of the driving bracket 11. The protective shell 51 and the driving bracket 11 are clamped by clamping the second clamping block 111 into the clamping interface 511.

[0054] like Figure 3 , Figure 4 and Figure 6 As shown, the protective shell 51 includes a first-stage planetary gear assembly 52 and a second-stage planetary gear assembly 53 that are fixedly connected, a first-stage inner gear ring 54 meshing with the outside of the first-stage planetary gear assembly 52, and a second-stage inner gear ring 55 meshing with the outside of the second-stage planetary gear assembly 53. The first-stage planetary gear assembly 52 includes a first-stage planetary bracket 521, and a through hole 5211 is provided in the middle of the first-stage planetary bracket 521. The driving gear 12 at the output end of the driving device 1 passes through the through hole 5211. The first-stage planetary gear assembly 52 also includes three first-stage planetary gears 522 arranged around the through hole 5211. The three first-stage planetary gears 522 are meshed with the driving gear 12 inside, and the three first-stage planetary gears 522 are meshed with the first-stage inner gear ring 54 outside. In the specific implementation process, the first-stage planetary gear 522 is meshed with the driving gear 12. When the driving device 1 drives the driving gear 12 to rotate clockwise, the driving gear 12 drives the first-stage planetary gear 522 to rotate counterclockwise.

[0055] like Figure 3 , Figure 5 Figure 6As shown, the bottom of the primary inner gear ring 54 of the embodiment of the present application is engaged with the driving bracket 11 through a third engaging structure, and the third engaging structure includes four first engaging holes 112 provided on the upper surface of the driving bracket 11 and a third engaging block 541 provided at the bottom of the primary inner gear ring 54 corresponding to the position of the first engaging holes 112, and the primary inner gear ring 54 is engaged with the driving bracket 11 by inserting the third engaging block 541 into the first engaging hole 112. In the specific implementation process, since the primary inner gear ring 54 is fixed, when the primary planetary gear 522 rotates counterclockwise under the drive gear 12, the primary planetary gear 522 and the primary inner gear ring 54 cooperate to drive the primary planetary bracket 521 to rotate clockwise.

[0056] like Figure 3 and Figure 7 As shown, the secondary planetary gear assembly 53 includes three secondary planetary gears 532, which are fixedly connected to the three primary planetary gears 522 in a one-to-one correspondence, and the three secondary planetary gears 532 are meshed with the secondary inner gear ring 55 on the outside. The secondary planetary gear assembly 53 also includes a secondary planetary bracket 531, which is engaged with the primary planetary bracket 521 through a third engaging structure. The third engaging structure includes three connecting rods 5212 arranged at the top of the primary planetary bracket 521 and connecting holes 5311 corresponding to the positions of the connecting rods 5212 and arranged at the bottom of the secondary planetary bracket 531, and the primary planetary bracket 521 is engaged with the secondary planetary bracket 531 by inserting the connecting rods 5212 into the connecting holes 5311. In the specific implementation process, the secondary planetary gear 532 is fixed to the primary planetary gear 522, so when the primary planetary gear 522 rotates counterclockwise, the secondary planetary gear 532 also rotates counterclockwise synchronously, thereby driving the secondary inner gear ring 55 meshed with the secondary planetary gear 532 to rotate counterclockwise.

[0057] The implementation principle of the embodiment of the present application is: due to the different transmission ratios of the driving gear 12, the planetary gears and the internal gear ring, the output rotation speed is also different. The first-stage deceleration is achieved by the driving gear 12, the first-stage planetary gear 522 and the first-stage internal gear ring 54, and the second-stage deceleration is achieved by the second-stage planetary gear 532 and the second-stage internal gear ring 55. The double deceleration setting ensures the reliability of the deceleration device 5 and improves the stability of the operation of the peristaltic pump in the embodiment of the present application.

[0058] like Figure 8 As shown, the peristaltic device 6 includes a pump tube 61 connecting two liquid passages 4 and an extrusion assembly 62 connected to the speed reduction mechanism, and the pump tube 61 surrounds the outside of the extrusion assembly 62. In the specific implementation process, the pump tube 61 is made of a hose material, and the pump tube 61 is squeezed by the extrusion assembly 62 to change the liquid flow rate flowing through the pump tube 61.

[0059] like Fig. 9 and Fig.10As shown, the extrusion assembly 62 includes a first connection seat 621, and the first connection seat 621 is clamped with the secondary inner gear ring 55 through a fourth clamping structure. A cross hollow 6211 is passed through the middle of the first connection seat 621 and a center column 6212 is extended upward. A cross connection column 551 is provided on the top of the secondary inner gear ring 55. The secondary inner gear ring 55 is clamped with the first connection seat 621 by inserting the cross connection column 551 into the cross hollow 6211. In the specific implementation process, the secondary inner gear ring 55 rotates counterclockwise, which drives the first connection seat 621 to rotate counterclockwise.

[0060] like Fig.11 As shown, the extrusion assembly 62 also includes four extrusion columns 623 arranged around the central column 6212 and a second connection seat 622 fixedly connected to the top of the four extrusion columns 623, and the second connection seat 622 is clamped with the first connection seat 621 through a fifth clamping structure. The fifth clamping structure includes a central clamping block 6221 extending downward from the middle of the second connection seat 622, and the shape of the central clamping block 6221 corresponds to the cross hollow 6211. The second connection seat 622 is clamped with the first connection seat 621 by inserting the central clamping block 6221 into the cross hollow 6211 of the central column 6212. The bottom of the extrusion column 623 is clamped with the first connection seat 621 through a sixth clamping structure. The sixth clamping structure includes a clamping portion 6231 at the bottom of the extrusion column and a second clamping hole 6213 at the top of the first connection seat. The extrusion column 623 is clamped with the first connection seat 621 by inserting the clamping portion 6231 into the second clamping hole 6213. In the specific implementation process, as the first connecting seat 621 rotates counterclockwise, it drives the second connecting seat 622 and the extrusion column 623 to rotate. The extrusion column 623 repeatedly squeezes the pump tube 61 during the rotation process. The tube forms a negative pressure cavity and is then squeezed out through the extrusion column 623, and the pumping function is realized by a reciprocating cycle.

[0061] The implementation principle of the embodiment of the present application is: while ensuring the stable operation of the peristaltic pump, the embodiment of the present application uses the first clamping structure, the second clamping structure, the third clamping structure, the fourth clamping structure and the fifth clamping structure to fix most of the structures of the peristaltic pump through clamping, which is convenient for installation and disassembly, thereby further improving the production efficiency and practicality of the peristaltic pump.

[0062] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A micro peristaltic pump, characterized in that: The invention comprises a driving device (1), a housing (2), a top cover (3), and two liquid passages (4) arranged outside the top cover (3); the housing (2) and the top cover (3) are snap-fitted to form a mounting cavity inside; a deceleration device (5) and a peristaltic device (6) are arranged inside the mounting cavity; the peristaltic device (6) is connected to the deceleration device (5), and the peristaltic device (6) is connected to the two liquid passages (4); The reduction device (5) comprises a first-stage planetary gear assembly (52) and a second-stage planetary gear assembly (53) which are fixedly connected, a first-stage inner gear ring (54) meshing with the outside of the first-stage planetary gear assembly (52), and a second-stage inner gear ring (55) meshing with the outside of the second-stage planetary gear assembly (53); the first-stage planetary gear assembly (52) is meshed with a driving gear (12) at the output end of the driving device (1).

2. A micro peristaltic pump according to claim 1, characterized in that: The primary planetary gear assembly (52) comprises a primary planetary support (521), a through hole (5211) is provided in the middle of the primary planetary support (521), and a driving gear (12) at the output end of the driving device (1) passes through the through hole (5211); The first-stage planetary gear assembly (52) further comprises a plurality of first-stage planetary gears (522) arranged around the through hole (5211), wherein the interior of the plurality of first-stage planetary gears (522) is meshed with the driving gear (12), and the exterior of the plurality of first-stage planetary gears (522) is meshed with the first-stage inner gear ring (54).

3. A micro peristaltic pump according to claim 2, characterized in that: A driving bracket (11) is provided on the top of the driving device (1), and the bottom of the primary inner gear ring (54) is clamped with the driving bracket (11).

4. A micro peristaltic pump according to claim 3, characterized in that: The secondary planetary gear assembly (53) comprises a plurality of secondary planetary gears (532), the plurality of secondary planetary gears (532) being fixedly connected to the plurality of primary planetary gears (522) in a one-to-one correspondence, and the exteriors of the plurality of secondary planetary gears (532) are meshed with the secondary inner gear ring (55); The secondary planetary gear assembly (53) further comprises a secondary planetary support (531) which is clamped to the primary planetary support (521).

5. A micro peristaltic pump according to claim 4, characterized in that: The top of the first-stage planetary bracket (521) is provided with a plurality of connecting rods (5212), and the bottom of the second-stage planetary bracket (531) is provided with a plurality of connecting holes (5311), and the connecting rods (5212) are used to be inserted into the connecting holes (5311) to enable the first-stage planetary bracket (521) to be clamped with the second-stage planetary bracket (531).

6. A micro peristaltic pump according to claim 3, characterized in that: The reduction device (5) further comprises a protective shell (51), wherein the protective shell (51) is sleeved on the outside of the primary inner gear ring (54) and the secondary inner gear ring (55), and the bottom of the protective shell (51) is clamped with the driving bracket (11).

7. A micro peristaltic pump according to claim 1, characterized in that: The peristaltic device (6) comprises a pump tube (61) communicating with two liquid passage tubes (4) and an extrusion assembly (62) connected to a speed reduction mechanism, wherein the pump tube (61) surrounds the outside of the extrusion assembly (62).

8. A micro peristaltic pump according to claim 7, characterized in that: The extrusion assembly (62) comprises a first connection seat (621), a middle portion of which is penetrated by a cross hollow portion (6211) and a central column (6212) extending upward; A cross connecting column (551) is provided at the top of the secondary inner gear ring (55), and the cross connecting column (551) is used to be inserted into the cross hollow (6211) to enable the secondary inner gear ring (55) to be clamped with the first connecting seat (621).

9. A micro peristaltic pump according to claim 8, characterized in that: The extrusion assembly (62) further comprises a plurality of extrusion columns (623) arranged around the central column (6212) and a second connection seat (622) fixedly connected to the tops of the plurality of extrusion columns (623); A central clamping block (6221) is provided in the middle of the second connecting seat (622) extending downward, and the central clamping block (6221) is used to be inserted into the cross hollow (6211) of the central column (6212) to clamp the second connecting seat (622) with the first connecting seat (621).

10. A micro peristaltic pump according to any one of claims 1 to 9, characterized in that: A clamping ring (31) is provided on the outside of the top cover (3), and a clamping block is provided on the outside of the outer shell (2). The clamping block is used to be clamped into the clamping ring (31) to clamp the top cover (3) and the outer shell (2).

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