peristaltic pump

Abstract

The application provides a peristaltic pump, comprising a pump body, an SMA driving mechanism, a sliding mechanism, a transmission mechanism and a roller assembly, one side of the pump body is provided with a connecting seat, the other side is provided with a shell, a channel for the hose to pass through is formed between the shell and the pump body, the SMA driving mechanism generates elastic contraction when powered to drive the sliding mechanism to slide relative to the connecting seat arranged on the pump body, the sliding mechanism drives the transmission mechanism to rotate when sliding, the transmission mechanism drives the roller assembly to rotate when rotating to extrude the hose to drive the medium in the hose to flow, since the SMA driving mechanism has the advantages of low driving voltage, no noise, high elasticity, metal rubber performance, large driving force and the like, so that the peristaltic pump provided by the application can realize high-precision, large-driving-force micro drive control, and significantly reduce the driving power consumption, thereby effectively improving the reliability and applicability of the whole machine.

Description

Technical Field

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

[0002] A peristaltic pump is a type of pump that transfers fluid by compressing a flexible tubing. It is a new type of fluid transfer pump that has been widely adopted after rotary pumps, centrifugal pumps, and diaphragm pumps. During operation, a peristaltic pump utilizes a roller assembly that rolls along an arc-shaped trajectory to compress the flexible tubing, or a pressure block assembly that sequentially compresses the tubing along a straight, serpentine trajectory, thus achieving unidirectional fluid transfer within the tubing. Because the fluid in a peristaltic pump only comes into contact with the tubing, it offers advantages such as low contamination, good sealing, and easy maintenance. Therefore, it is widely used in industries such as medical, pharmaceutical, food, beverage, chemical, and metallurgical processing.

[0003] Existing peristaltic pumps typically rely on a motor to drive the roller assembly or pressure block assembly to rotate or reciprocate. To ensure continuous extrusion and stable flow, two or more rollers or pressure blocks are generally required, and they need to be coordinated with mechanical structures such as reduction gears and transmission mechanisms to achieve controlled movement.

[0004] This type of structure is relatively mature in achieving medium flow rate delivery, but it generally suffers from the characteristic that its size is difficult to further reduce, which makes peristaltic pumps unable to adapt to working environments with higher delivery accuracy. At the same time, micro pumps using the above structure also have problems such as high noise in the drive mechanism, insufficient driving force, and low energy utilization efficiency. Summary of the Invention

[0005] The purpose of this application is to provide a miniaturized peristaltic pump to solve the technical problems of existing peristaltic pumps, such as inability to adapt to working environments with higher delivery accuracy, high noise in the drive mechanism, insufficient driving force, and low energy utilization efficiency.

[0006] To achieve the above objectives, the technical solution adopted in this application is to provide a peristaltic pump, comprising: A pump body, wherein a connecting seat is provided on one side, and a housing is provided on the side of the pump body opposite to the connecting seat, and a channel for a hose to pass through is formed between the housing and the pump body; SMA drive mechanism, connected to the connecting seat; A sliding mechanism is slidably connected to the connecting seat and connected to the SMA drive mechanism. When the SMA drive mechanism is energized, it generates elastic contraction to drive the sliding mechanism to reciprocate relative to the connecting seat. A transmission mechanism is rotatably connected to the connecting seat, and the transmission mechanism is detachably connected to the sliding mechanism via a snap-fit ​​mechanism. The transmission mechanism rotates relative to the connecting seat under the drive of the sliding mechanism. A roller assembly is rotatably connected to the pump body and to the transmission mechanism. The roller assembly abuts against the hose and is used to squeeze the hose under the drive of the SMA drive mechanism to drive the flow of the medium inside the hose.

[0007] Optionally, the SMA drive mechanism includes a first SMA drive mechanism and a second SMA drive mechanism, wherein the first SMA drive mechanism and the second SMA drive mechanism are symmetrically arranged about the connecting seat; The sliding mechanism includes a first sliding mechanism and a second sliding mechanism, which are located on both sides of the transmission mechanism; The first SMA drive mechanism is connected to the first sliding mechanism, and the second SMA drive mechanism is connected to the second sliding mechanism; When the first SMA drive mechanism is energized, the second SMA drive mechanism is de-energized. The first SMA drive mechanism drives the first sliding mechanism to rotate the transmission mechanism. When the second SMA drive mechanism is energized, the first SMA drive mechanism is de-energized. The second SMA drive mechanism drives the second sliding mechanism to rotate the transmission mechanism. Both the first sliding mechanism and the second sliding mechanism drive the transmission mechanism to rotate relative to the connecting seat in the same direction.

[0008] Optionally, the peristaltic pump also includes: The connector has one end connected to the first sliding mechanism and the other end connected to the second sliding mechanism; When the first SMA drive mechanism is energized and the second SMA drive mechanism is de-energized, the first sliding mechanism drives the second sliding mechanism back to its initial position through the connector; When the second SMA drive mechanism is energized and the first SMA drive mechanism is de-energized, the second sliding mechanism drives the first sliding mechanism back to its initial position through the connector.

[0009] Optionally, the SMA drive mechanism includes: The shape memory alloy wire has both ends fixedly connected to the connecting seat in the length direction. After the shape memory alloy wire is sleeved on the sliding mechanism, it forms a sleeve portion with an opening. The shape memory alloy wire elastically contracts when energized. The first guide wheel and the second guide wheel are both rotatably connected to the connecting seat, and the first guide wheel and the second guide wheel are spaced apart. The shape memory alloy wire is wound around the outer periphery of the first guide wheel and the second guide wheel, and changes the traction direction under the guidance of the first guide wheel and the second guide wheel; The sleeve portion is located between the first guide wheel and the second guide wheel, and the sleeve portion is sleeved on the sliding mechanism to drive the sliding mechanism to reciprocate when the shape memory alloy wire is energized and elastically contracts.

[0010] Optionally, the peristaltic pump also includes: The base plate is connected to the side of the connecting seat opposite to the pump body; The base plate is provided with a first limiting strip, a second limiting strip and a third limiting strip arranged in a triangle. The first limiting strip is located between the first guide wheel and the second guide wheel, the second limiting strip is located between the first guide wheel and one end of the shape memory alloy wire, and the third limiting strip is located between the second guide wheel and the other end of the shape memory alloy wire.

[0011] Optionally, the sliding mechanism includes: The slider is slidably connected to the connecting seat; A movable wheel is connected to the slider, and the sleeve portion is sleeved on the outer periphery of the movable wheel; The slider is detachably connected to the transmission mechanism via the snap-fit ​​mechanism.

[0012] Optionally, the sliding mechanism further includes: Ball bearings are mounted on the slider; The pump body has a ball groove on the side facing the connecting seat, and the ball rolls into the ball groove.

[0013] Optionally, the transmission mechanism includes: A drive gear is rotatably connected to the connecting seat, and the roller assembly is connected to the drive gear; The driven gear is rotatably connected to the connecting seat and is spaced apart from the driving gear; A timing belt is fitted around the outer periphery of the drive gear and the driven gear, and the slider is detachably connected to the outer side of the timing belt through the snap-fit ​​mechanism.

[0014] Optionally, the latching mechanism includes: The snap-fit ​​component has a first end and a second end, the first end being slidably connected to the slider, and the second end having a snap-fit ​​portion protruding from it, the snap-fit ​​portion extending along the rotation direction of the timing belt; The outer wall of the synchronous belt is provided with a slot, the shape of which is the same as that of the second end, and there are multiple slots, which are evenly spaced along the circumference of the synchronous belt. When the slider drives the timing belt to rotate relative to the connecting seat, the second end engages in the slot.

[0015] Optionally, an elastic element is provided between the first end and the slider, with one end of the elastic element abutting against the first end and the other end abutting against the slider.

[0016] The peristaltic pump provided in this application has the following advantages: Compared with the prior art, the peristaltic pump provided in this application includes a pump body, an SMA drive mechanism, a sliding mechanism, a transmission mechanism, and a roller assembly. One side of the pump body is provided with a connecting seat, and the other side is provided with a housing. A channel for a hose to pass through is formed between the housing and the pump body. When the SMA drive mechanism is energized, it elastically contracts to drive the sliding mechanism to slide relative to the connecting seat on the pump body. When the sliding mechanism slides, it drives the transmission mechanism to rotate. When the transmission mechanism rotates, it drives the roller assembly to rotate to squeeze the hose and drive the medium inside the hose to flow. Since the SMA drive mechanism has advantages such as low driving voltage, no noise, high elasticity, metal-rubber properties, and large driving force, the peristaltic pump provided in this application can achieve high-precision, large-stroke micro-drive control, while significantly reducing drive power consumption, thereby effectively improving the reliability and applicability of the whole machine. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the peristaltic pump provided in an embodiment of this application; Figure 2 This is a schematic diagram of the peristaltic pump provided in an embodiment of this application from another perspective; Figure 3 This is a schematic diagram of the peristaltic pump provided in an embodiment of this application from another perspective; Figure 4 This is an exploded structural diagram of a peristaltic pump provided in an embodiment of this application; Figure 5 Schematic diagram of the SMA drive mechanism provided in the embodiments of this application Figure 1 ; Figure 6 Schematic diagram of the SMA drive mechanism provided in the embodiments of this application Figure 2 ; Figure 7 This is a schematic diagram of the sliding mechanism provided in an embodiment of this application; Figure 8 This is a schematic diagram of the sliding mechanism driving the transmission mechanism to rotate in this application; Figure 9This is a schematic diagram showing the rotational coordination between the sliding mechanism and the transmission mechanism in this application; Figure 10 This is a schematic diagram of the pump body provided in an embodiment of this application; Figure 11 This is a schematic diagram of the pump body from another perspective, provided in an embodiment of this application. Figure 12 This is a schematic diagram of the drive roller assembly of the transmission mechanism in this application.

[0019] The following are the labeling elements in the figure: 10. Pump body; 11. Channel; 12. Ball groove; 13. Second receiving groove; 20. SMA drive mechanism; 20a. First SMA drive mechanism; 20b. Second SMA drive mechanism; 21. Shape memory alloy wire; 211. Sleeve part; 22. First guide wheel; 23. Second guide wheel; 24. First circuit port; 25. Second circuit port; 26. Third guide wheel; 27. Fourth guide wheel; 30. Sliding mechanism; 30a. First sliding mechanism; 30b. Second sliding mechanism; 31. Slider; 32. Moving wheel; 33. 34. Ball bearing; 40. Connector; 41. Transmission mechanism; 42. Drive gear; 43. Driven gear; 44. Synchronous belt; 45. Slot; 50. Roller assembly; 51. Rotating seat; 52. Roller; 60. Connecting seat; 61. Slide groove; 62. Guide through hole; 63. First receiving slot; 70. Housing; 80. Snap-fit ​​mechanism; 80a. First snap-fit ​​mechanism; 80b. Second snap-fit ​​mechanism; 81. Snap-fit ​​component; 82. Snap-fit ​​part; 83. Elastic component; 90. Base plate; 91. First limiting strip; 92. Second limiting strip; 93. Third limiting strip. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Shape memory alloys (SMAs) are a class of smart materials possessing shape memory effect and superelastic properties. At low temperatures, SMAs exist in a martensitic phase structure, making them relatively soft and prone to plastic deformation. When stimulated by electric heating or ambient temperature rise, their crystal structure transforms into an austenitic phase, allowing them to recover their pre-set shape and output a large restoring force. By controlling the on / off state of SMAs, periodic expansion and contraction movements can be achieved, making them suitable as driving elements in precision machinery, medical devices, and microfluidic systems. Compared to traditional motors or electromagnetic drives, SMA drive mechanisms offer advantages such as simple structure, small size, low driving voltage, low noise, and high driving force per unit volume, making them particularly suitable for space-constrained miniaturized devices with high requirements for low power consumption and low noise.

[0025] In existing technologies, peristaltic pumps typically rely on a motor to drive roller assemblies or pressure block assemblies to rotate or reciprocate. To ensure continuous extrusion and stable flow, two or more rollers or pressure blocks are generally required, along with mechanical structures such as reduction gears and transmission mechanisms to achieve controlled motion. This approach results in peristaltic pumps that are large in size, have noisy drive mechanisms, complex structures, and low energy efficiency.

[0026] To solve the above problems, please provide a peristaltic pump that includes an SMA drive mechanism.

[0027] Please refer to the following: Figures 1 to 12 The peristaltic pump provided in the embodiments of this application will now be described.

[0028] A peristaltic pump, please refer to Figures 1 to 7 It includes a pump body 10, an SMA drive mechanism 20, a sliding mechanism 30, a transmission mechanism 40, and a roller assembly 50.

[0029] The pump body 10 has a connecting seat 60 on one side and a housing 70 on the side of the pump body 10 away from the connecting seat 60. A channel 11 is formed between the housing 70 and the pump body 10 for a hose (not shown) to pass through.

[0030] Specifically, the SMA drive mechanism 20 is connected to the side of the connecting seat 60 facing away from the pump body 10. The sliding mechanism 30 is slidably connected to the side of the connecting seat 60 facing the pump body 10 and is connected to the SMA drive mechanism 20. When the SMA drive mechanism 20 is energized, it elastically contracts to drive the sliding mechanism 30 to reciprocate relative to the connecting seat 60. The transmission mechanism 40 is rotatably connected to the side of the connecting seat 60 facing the pump body 10. The transmission mechanism 40 is detachably connected to the sliding mechanism 30 through the snap-fit ​​mechanism 80. The transmission mechanism 40 rotates relative to the connecting seat 60 under the drive of the sliding mechanism 30. The roller assembly 50 is rotatably connected inside the pump body 10 and is connected to the transmission mechanism 40. The roller assembly 50 abuts against the hose and is used to squeeze the hose under the drive of the SMA drive mechanism 20 to drive the flow of the medium inside the hose.

[0031] When the SMA drive mechanism 20 is energized, it elastically contracts and drives the sliding mechanism 30 to slide relative to the connecting seat 60. When the sliding mechanism 30 slides, it drives the transmission mechanism 40 to rotate relative to the connecting seat 60. When the transmission mechanism 40 rotates, it drives the roller assembly 50 to rotate, thereby squeezing the hose to drive the medium inside the hose to flow.

[0032] Compared with the prior art, the peristaltic pump provided in this application uses an SMA drive mechanism 20 as a power source. When energized, the SMA drive mechanism 20 elastically contracts to drive the sliding mechanism 30 to slide relative to the connecting seat 60 on the pump body 10. When sliding, the sliding mechanism 30 drives the transmission mechanism 40 to rotate. When rotating, the transmission mechanism 40 drives the roller assembly 50 to rotate, thereby squeezing the hose to drive the medium inside the hose to flow. Since the SMA drive mechanism 20 has advantages such as low driving voltage, no noise, high elasticity, metal-rubber properties, and large driving force, the peristaltic pump provided in this application can achieve high-precision, large-stroke micro-drive control, while significantly reducing drive power consumption, thereby effectively improving the reliability and applicability of the whole machine.

[0033] In this application, as Figure 5 and Figure 6 As shown, the SMA drive mechanism 20 includes a first SMA drive mechanism 20a and a second SMA drive mechanism 20b, and the sliding mechanism 30 includes a first sliding mechanism 30a and a second sliding mechanism 30b.

[0034] Specifically, the first SMA drive mechanism 20a and the second SMA drive mechanism 20b are symmetrically arranged about the center of the connecting seat 60, the first sliding mechanism 30a and the second sliding mechanism 30b are located on both sides of the transmission mechanism 40, the first SMA drive mechanism 20a is connected to the first sliding mechanism 30a, and the second SMA drive mechanism 20b is connected to the second sliding mechanism 30b.

[0035] When the first SMA drive mechanism 20a is energized and the second SMA drive mechanism 20b is de-energized, the first SMA drive mechanism 20a elastically contracts upon energization, driving the first sliding mechanism 30a to slide relative to the connecting seat 60, thereby rotating the transmission mechanism 40. Simultaneously, the second SMA drive mechanism 20b returns to its initial state upon de-energization, facilitating elastic contraction upon subsequent energization. When the second SMA drive mechanism 20b is energized, the first SMA drive mechanism 20a is de-energized. The second SMA drive mechanism 20b elastically contracts upon energization, driving the second sliding mechanism 30b to slide relative to the connecting seat 60, thereby rotating the transmission mechanism 40. Simultaneously, the first SMA drive mechanism 20a returns to its initial state upon de-energization, facilitating elastic contraction upon subsequent energization. Both the first sliding mechanism 30a and the second sliding mechanism 30b drive the transmission mechanism 40 to rotate relative to the connecting seat 60 in the same direction, thereby causing the transmission mechanism 40 to rotate the roller assembly 50 in the same direction, and thus causing the roller assembly 50 to drive the medium within the hose to flow in the same direction.

[0036] It should be noted that when the second SMA drive mechanism 20b is de-energized, the first SMA drive mechanism 20a is energized, and when the first SMA drive mechanism 20a is de-energized, the second SMA drive mechanism 20b is energized, so that the first sliding mechanism 30a and the second sliding mechanism 30b can continuously drive the transmission mechanism 40 to rotate, thereby realizing the continuous rotation of the roller assembly 50 to complete the continuous output of fluid in the hose.

[0037] In this application, please refer to Figures 5 to 9 The peristaltic pump also includes a connector 34, one end of which is connected to the first sliding mechanism 30a, and the other end of which is connected to the second sliding mechanism 30b.

[0038] Specifically, when the first SMA drive mechanism 20a is energized and the second SMA drive mechanism 20b is de-energized, the first SMA drive mechanism 20a generates elastic contraction after being energized, and drives the first sliding mechanism 30a to slide relative to the connecting seat 60. The first sliding mechanism 30a drives the second sliding mechanism 30b back to the initial position through the connecting member 34.

[0039] When the second SMA drive mechanism 20b is energized and the first SMA drive mechanism 20a is de-energized, the second SMA drive mechanism 20b elastically contracts upon energization, driving the second sliding mechanism 30b to slide relative to the connecting seat 60. The second sliding mechanism 30b then drives the first sliding mechanism 30a back to its initial position via the connecting member 34. By providing the connecting member 34, the SMA drive mechanism 20 achieves continuous driving force and improves its energy utilization efficiency.

[0040] In this application, as Figure 5 and Figure 6 As shown, the first SMA drive mechanism 20a and the second SMA drive mechanism 20b have the same structure, both including shape memory alloy wire 21, first guide wheel 22 and second guide wheel 23, wherein the shape memory alloy wire 21, first guide wheel 22 and second guide wheel 23 are all located on the side of the connecting seat 60 away from the housing.

[0041] Both ends of the shape memory alloy wire 21 are fixedly connected to the connecting seat 60 along its length. After being sleeved on the sliding mechanism 30, the shape memory alloy wire 21 forms a sleeve portion 211, which has an opening. The shape memory alloy wire 21 elastically contracts when energized. The first guide wheel 22 and the second guide wheel 23 are both rotatably connected to the connecting seat 60, and the first guide wheel 22 and the second guide wheel 23 are spaced apart. The shape memory alloy wire 21 is wound around the outer periphery of the first guide wheel 22 and the second guide wheel 23, and changes its traction direction under the guidance of the first guide wheel 22 and the second guide wheel 23. The sleeve portion 211 is located between the first guide wheel 22 and the second guide wheel 23, and is sleeved on the sliding mechanism 30 to drive the sliding mechanism 30 to reciprocate when the shape memory alloy wire 21 elastically contracts when energized. With the above configuration, the shape memory alloy wire 21 can make full use of the internal space to achieve a miniaturized design of the drive structure, while also facilitating the extension of the length of the shape memory alloy wire 21, thereby improving the driving force and driving stroke of the SMA drive mechanism 20.

[0042] Specifically, when the shape memory alloy wire 21 in the first SMA drive mechanism 20a is energized and elastically contracts, the shape memory alloy wire 21 in the second SMA drive mechanism 20b is de-energized and returns to its initial length; and when the shape memory alloy wire 21 in the second SMA drive mechanism 20b is energized and elastically contracts, the shape memory alloy wire 21 in the first SMA drive mechanism 20a is de-energized and returns to its initial length.

[0043] When the shape memory alloy wire 21 in the first SMA drive mechanism 20a is energized, the shape memory alloy wire 21 contracts to drive the first sliding mechanism 30a to slide relative to the connecting seat 60. When the shape memory alloy wire 21 in the second SMA drive mechanism 20b is energized, the shape memory alloy wire 21 contracts to drive the second sliding mechanism 30b to slide relative to the connecting seat 60. By controlling the shape memory alloy wire 21 in the first SMA drive mechanism 20a and the shape memory alloy wire 21 in the second SMA drive mechanism 20b to be alternately energized, the shape memory alloy wire 21 in the first SMA drive mechanism 20a and the shape memory alloy wire 21 in the second SMA drive mechanism 20b alternately generate elastic contraction, thereby causing the first sliding mechanism 30a and the second sliding mechanism 30b to alternately slide relative to the connecting seat 60 to drive the transmission mechanism 40 to rotate.

[0044] When the shape memory alloy wires 21 in the first SMA drive mechanism 20a and the second SMA drive mechanism 20b are simultaneously energized, the shape memory alloy wires 21 can also generate a contraction to apply a balancing force to the first sliding mechanism 30a and the second sliding mechanism 30b, so that the first sliding mechanism 30a and the second sliding mechanism 30b remain stationary relative to the connecting seat 60. This causes the SMA drive mechanism 20 to quickly self-lock, thereby causing the roller assembly 50 to stop quickly, so as to stop the continuous output of fluid in the hose, and thus achieve high-precision drive control.

[0045] In one implementation of this application, such as Figure 5 and Figure 6 As shown, the SMA drive mechanism 20 also includes a controller (not shown), a first circuit port 24 and a second circuit port 25. That is, both the first SMA drive mechanism 20a and the second SMA drive mechanism 20b include a controller, a first circuit port 24 and a second circuit port 25.

[0046] Specifically, the first circuit port 24 and the second circuit port 25 are connected to the side of the connector 60 away from the pump body 10. The first circuit port 24 is fixedly connected to one end of the shape memory alloy wire 21 along its length, and the second circuit port 25 is fixedly connected to the other end of the shape memory alloy wire 21 along its length. The controller is electrically connected to the first circuit port 24 and the second circuit port 25 and is used to control the first circuit port 24 and the second circuit port 25 to energize or de-energize the shape memory alloy wire 21.

[0047] When the controller controls the first circuit port 24 and the second circuit port 25 in the first SMA drive mechanism 20a to energize the shape memory alloy wire 21 in the first SMA drive mechanism 20a, the controller controls the first circuit port 24 and the second circuit port 25 in the second SMA drive mechanism 20b to de-energize the shape memory alloy wire 21 in the second SMA drive mechanism 20b; when the controller controls the first circuit port 24 and the second circuit port 25 in the second SMA drive mechanism 20b to energize the shape memory alloy wire 21 in the second SMA drive mechanism 20b, the controller controls the first circuit port 24 and the second circuit port 25 in the first SMA drive mechanism 20a to de-energize the shape memory alloy wire 21 in the first SMA drive mechanism 20a.

[0048] In one embodiment of this application, such as Figure 5 and Figure 6 As shown, the SMA drive mechanism 20 also includes a third guide wheel 26 and a fourth guide wheel 27, that is, both the first SMA drive mechanism 20a and the second SMA drive mechanism 20b include a third guide wheel 26 and a fourth guide wheel 27.

[0049] Specifically, the third guide wheel 26 and the fourth guide wheel 27 are rotatably connected to one side of the back pump body 10 of the connecting seat 60. The third guide wheel 26 is close to one end of the shape memory alloy wire 21 and the first circuit port 24, and the fourth guide wheel 27 is close to one end of the shape memory alloy wire 21 and the second circuit port 25. The shape memory alloy wire 21 is wound around the outer periphery of the third guide wheel 26 and the fourth guide wheel 27, and changes the traction direction under the guidance of the third guide wheel 26 and the fourth guide wheel 27.

[0050] In this application, the peristaltic pump also includes a base plate 90.

[0051] Specifically, such as Figure 4 As shown, the base plate 90 is connected to the side of the connecting seat 60 away from the pump body 10. The base plate 90 is provided with a first limiting strip 91, a second limiting strip 92 and a third limiting strip 93 arranged in a triangle. The first limiting strip 91 is located between the first guide wheel 22 and the second guide wheel 23, the second limiting strip 92 is located between the first guide wheel 22 and one end of the shape memory alloy wire 21, and the third limiting strip 93 is located between the second guide wheel 23 and the other end of the shape memory alloy wire 21.

[0052] After the bottom edge is connected to the connecting seat 60, the first limiting strip 91, the second limiting strip 92 and the third limiting strip 93 form a separation and limiting constraint on the shape memory alloy wire 21 to avoid the shape memory alloy wire 21 from shifting laterally or interfering with adjacent components during the driving process, thereby ensuring that its extension stroke is controlled, the transmission stability is higher, and the overall machine working reliability is improved.

[0053] In this application, as Figures 7 to 9 As shown, the sliding mechanism 30 includes a slider 31 and a moving wheel 32, meaning that both the first sliding mechanism 30a and the second sliding mechanism 30b include a slider 31 and a moving wheel 32. The slider 31 is slidably connected to the connecting seat 60, and the moving wheel 32 is connected to the slider 31. A shape memory alloy wire 21 is sleeved around the outer periphery of the moving wheel 32, forming an open sleeve portion 211. The slider 31 is detachably connected to the transmission mechanism 40 via a snap-fit ​​mechanism 80. There are two snap-fit ​​mechanisms 80: a first snap-fit ​​mechanism 80a and a second snap-fit ​​mechanism 80b. The slider 31 in the first sliding mechanism 30a is detachably connected to the transmission mechanism 40 via the first snap-fit ​​mechanism 80a, and the slider 31 in the second sliding mechanism 30b is detachably connected to the transmission mechanism 40 via the second snap-fit ​​mechanism 80b.

[0054] The slider 31 in the first sliding mechanism 30a is connected to the slider 31 in the second sliding mechanism 30b via the connector 34. When the shape memory alloy wire 21 in the first SMA drive mechanism 20a is energized, the shape memory alloy wire 21 contracts to drive the slider 31 in the first sliding mechanism 30a to slide relative to the connecting seat 60. At this time, the slider 31 in the first sliding mechanism 30a drives the slider 31 in the second sliding mechanism 30b back to its initial position via the connector 34, and the second locking mechanism 80b separates from the transmission mechanism 40. When the shape memory alloy wire 21 in the second SMA drive mechanism 20b is energized, the shape memory alloy wire 21 contracts to drive the slider 31 in the second sliding mechanism 30b to slide relative to the connecting seat 60. At this time, the slider 31 in the second sliding mechanism 30b drives the slider 31 in the first sliding mechanism 30a back to its initial position via the connector 34, and the first locking mechanism 80a separates from the transmission mechanism 40.

[0055] The connecting seat 60 has a groove 61 on the side facing the pump body 10. The slider 31 is slidably connected in the groove 61. The bottom wall of the groove 61 has a guide hole 62. The slider 31 has a connecting shaft. The connecting shaft passes through the guide hole 62 and extends to the side of the connecting seat 60 away from the pump body 10, and is connected to the moving wheel 32. The moving wheel 32 rotates relative to the connecting shaft. Along the sliding direction of the slider 31, the length of the groove 61 is greater than the length of the slider 31, so that the slider 31 can slide in the groove 61.

[0056] In this application, the sliding mechanism 30 also includes a ball bearing 33, that is, both the first sliding mechanism 30a and the second sliding mechanism 30b also include a ball bearing 33.

[0057] Specifically, such as Figure 8 and Figure 10As shown, the ball bearing 33 is mounted on the slider 31. A ball groove 12 is provided on the side of the pump body 10 facing the connecting seat 60, and the ball bearing 33 rolls into the ball groove 12. The extending direction of the ball groove 12 is consistent with the sliding direction of the slider 31. There are two ball grooves 12, and their positions correspond to the positions of the slider 31 in the first sliding mechanism 30a and the slider 31 in the second sliding mechanism 30b, respectively. When the slider 31 in the first sliding mechanism 30a slides, the balls 33 on the slider 31 in the first sliding mechanism 30a roll and engage with the corresponding ball grooves 12. When the slider 31 in the second sliding mechanism 30b slides, the balls 33 on the slider 31 in the second sliding mechanism 30b roll and engage with the corresponding ball grooves 12. This allows the slider 31 in the first sliding mechanism 30a and the slider 31 in the second sliding mechanism 30b to slide relative to the pump body 10. The driving force of the SMA drive mechanism 20 is efficiently converted into the thrust that drives the transmission mechanism 40 to rotate through the sliding mechanism 30, reducing friction loss and improving energy utilization efficiency.

[0058] Optionally, the transmission mechanism 40 includes a drive gear 41, a driven gear 42, and a timing belt 43.

[0059] Specifically, such as Figure 8 and Figure 10 As shown, the connecting seat 60 has a first receiving groove 63 on the side facing the pump body 10. The drive gear 41, the driven gear 42 and the timing belt 43 are all rotatably connected in the first receiving groove 63. The drive gear 41 and the driven gear protrude from the plane where the opening of the first receiving groove 63 is located. The pump body 10 has a second receiving groove 13 on the side facing the connecting seat 60 for accommodating the portion of the drive gear 41 and the driven gear 42 that protrudes from the plane where the opening of the first receiving groove 63 is located.

[0060] like Figure 8 and Figure 12 As shown, the roller assembly 50 is connected to the drive gear 41, and the driven gear 42 is spaced apart from the drive gear 41 within the first receiving groove 63. The timing belt 43 is sleeved on the outer periphery of the drive gear 41 and the driven gear 42, and the slider 31 is detachably connected to the outer side of the timing belt 43 through the snap-fit ​​mechanism 80. That is, the slider 31 in the first sliding mechanism 30a is detachably connected to the timing belt 43 through the first snap-fit ​​mechanism 80a, and the slider 31 in the second sliding mechanism 30b is detachably connected to the timing belt 43 through the second snap-fit ​​mechanism 80b.

[0061] When the slider 31 in the first sliding mechanism 30a drives the synchronous belt 43 to rotate through the first snap-fit ​​mechanism 80a and the slider 31 in the second sliding mechanism 30b drives the synchronous belt 43 to rotate through the second snap-fit ​​mechanism 80b, the synchronous belt 43 drives the drive gear 41 and the driven gear 42 to rotate, and the drive gear 41 drives the roller assembly 50 to rotate, so as to squeeze the hose to drive the medium inside the hose to flow.

[0062] In this application, the first card-connecting mechanism 80a and the second card-connecting mechanism 80b have the same structure, both including a card-connecting element 81.

[0063] Specifically, such as Figures 7 to 9 As shown, the locking member 81 has a first end and a second end. The first end is slidably connected to the slider 31, and the second end has a protruding locking portion 82 that extends along the rotation direction of the synchronous belt 43. A slot 431 is provided on the outer wall of the synchronous belt 43. The shape of the slot 431 is the same as that of the second end, and there are multiple slots 431 that are evenly spaced along the circumference of the synchronous belt 43. When the slider 31 drives the synchronous belt 43 to rotate relative to the connecting seat 60, the second end engages within the slot 431.

[0064] Specifically, when the slider 31 in the first sliding mechanism 30a drives the synchronous belt 43 to rotate via the locking member 81 in the first locking mechanism 80a, the slider 31 in the first sliding mechanism 30a drives the slider 31 in the second sliding mechanism 30b to return to its initial position via the connecting member 34, and the slider 31 in the second sliding mechanism 30b drives the locking member 81 in the second locking mechanism 80b to separate from the synchronous belt 43. Similarly, when the slider 31 in the second sliding mechanism 30b drives the synchronous belt 43 to rotate via the locking member 81 in the second locking mechanism 80b, the slider 31 in the second sliding mechanism 30b drives the slider 31 in the first sliding mechanism 30a to return to its initial position via the connecting member 34, and the slider 31 in the first sliding mechanism 30a drives the locking member 81 in the first locking mechanism 80a to separate from the synchronous belt 43.

[0065] In this application, as Figure 7 As shown, an elastic element 83 is provided between the first end of the snap-fit ​​member 81 and the slider 31. One end of the elastic element 83 abuts against the first end, and the other end abuts against the slider 31. When the slider 31 drives the synchronous belt 43 to rotate, the snap-fit ​​member 81 and the snap-fit ​​groove 431 are fully engaged under the action of the elastic force of the elastic element 83.

[0066] Specifically, the slider 31 is provided with a receiving cavity 311, the first end of the snap-fit ​​member 81 is slidably connected in the receiving cavity 311, one end of the elastic member 83 abuts against the first end, and the other end abuts against the bottom wall of the receiving cavity 311.

[0067] In this application, as Figure 11 and Figure 12As shown, the roller assembly 50 includes a rotating base 51 and rollers 52. The rotating base 51 is connected to a drive gear 41 and rotates under the drive of the drive gear 41. The rollers 52 are rotatably connected to the rotating base 51, and the outer wall of the rollers 52 abuts against the hose. When the rollers 52 rotate, they squeeze the hose to drive the medium inside the hose to flow. There are multiple rollers 52, which are evenly spaced along the circumference of the rotating base 51.

[0068] Preferably, in this application, the number of rollers 52 is three.

[0069] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A peristaltic pump, characterized in that, include: A pump body, wherein a connecting seat is provided on one side, and a housing is provided on the side of the pump body opposite to the connecting seat, and a channel for a hose to pass through is formed between the housing and the pump body; SMA drive mechanism, connected to the connecting seat; A sliding mechanism is slidably connected to the connecting seat and connected to the SMA drive mechanism. When the SMA drive mechanism is energized, it generates elastic contraction to drive the sliding mechanism to reciprocate relative to the connecting seat. A transmission mechanism is rotatably connected to the connecting seat, and the transmission mechanism is detachably connected to the sliding mechanism via a snap-fit ​​mechanism. The transmission mechanism rotates relative to the connecting seat under the drive of the sliding mechanism. A roller assembly, rotatably connected to the pump body and connected to the transmission mechanism, abuts against the hose and is used to compress the hose under the drive of the SMA drive mechanism to drive the flow of the medium within the hose; wherein, The SMA drive mechanism includes: The shape memory alloy wire has both ends fixedly connected to the connecting seat in the length direction. After the shape memory alloy wire is sleeved on the sliding mechanism, it forms a sleeve part with an opening. The shape memory alloy wire elastically contracts when energized. The first guide wheel and the second guide wheel are both rotatably connected to the connecting seat, and the first guide wheel and the second guide wheel are spaced apart. The shape memory alloy wire is wound around the outer periphery of the first guide wheel and the second guide wheel, and changes the traction direction under the guidance of the first guide wheel and the second guide wheel; The sleeve portion is located between the first guide wheel and the second guide wheel, and the sleeve portion is sleeved on the sliding mechanism to drive the sliding mechanism to reciprocate when the shape memory alloy wire is energized and elastically contracts. The sliding mechanism includes: The slider is slidably connected to the connecting seat; A movable wheel is connected to the slider, and the sleeve portion is sleeved on the outer periphery of the movable wheel; The slider is detachably connected to the transmission mechanism via the snap-fit ​​mechanism.

2. The peristaltic pump as described in claim 1, characterized in that, The SMA drive mechanism includes a first SMA drive mechanism and a second SMA drive mechanism, which are symmetrically arranged about the connecting seat. The sliding mechanism includes a first sliding mechanism and a second sliding mechanism, which are located on both sides of the transmission mechanism; The first SMA drive mechanism is connected to the first sliding mechanism, and the second SMA drive mechanism is connected to the second sliding mechanism; When the first SMA drive mechanism is energized, the second SMA drive mechanism is de-energized. The first SMA drive mechanism drives the first sliding mechanism to rotate the transmission mechanism. When the second SMA drive mechanism is energized, the first SMA drive mechanism is de-energized. The second SMA drive mechanism drives the second sliding mechanism to rotate the transmission mechanism. Both the first sliding mechanism and the second sliding mechanism drive the transmission mechanism to rotate relative to the connecting seat in the same direction.

3. The peristaltic pump as described in claim 2, characterized in that, Also includes: The connector has one end connected to the first sliding mechanism and the other end connected to the second sliding mechanism; When the first SMA drive mechanism is energized and the second SMA drive mechanism is de-energized, the first sliding mechanism drives the second sliding mechanism back to its initial position through the connector. When the second SMA drive mechanism is energized and the first SMA drive mechanism is de-energized, the second sliding mechanism drives the first sliding mechanism back to its initial position through the connector.

4. The peristaltic pump as described in claim 3, characterized in that, Also includes: The base plate is connected to the side of the connecting seat opposite to the pump body; The base plate is provided with a first limiting strip, a second limiting strip and a third limiting strip arranged in a triangle. The first limiting strip is located between the first guide wheel and the second guide wheel, the second limiting strip is located between the first guide wheel and one end of the shape memory alloy wire, and the third limiting strip is located between the second guide wheel and the other end of the shape memory alloy wire.

5. The peristaltic pump as described in claim 4, characterized in that, The sliding mechanism further includes: Ball bearings are mounted on the slider; The pump body has a ball groove on the side facing the connecting seat, and the ball rolls into the ball groove.

6. The peristaltic pump as described in claim 5, characterized in that, The transmission mechanism includes: A drive gear is rotatably connected to the connecting seat, and the roller assembly is connected to the drive gear; The driven gear is rotatably connected to the connecting seat and is spaced apart from the driving gear; A timing belt is fitted around the outer periphery of the drive gear and the driven gear, and the slider is detachably connected to the outer side of the timing belt through the snap-fit ​​mechanism.

7. The peristaltic pump as claimed in claim 6, characterized in that, The latching mechanism includes: The snap-fit ​​component has a first end and a second end, the first end being slidably connected to the slider, and the second end having a snap-fit ​​portion protruding from it, the snap-fit ​​portion extending along the rotation direction of the timing belt; The outer wall of the synchronous belt is provided with a slot, the shape of which is the same as that of the second end, and there are multiple slots, which are evenly spaced along the circumference of the synchronous belt. When the slider drives the timing belt to rotate relative to the connecting seat, the second end engages in the slot.

8. The peristaltic pump as claimed in claim 7, characterized in that, An elastic element is provided between the first end and the slider, with one end of the elastic element abutting against the first end and the other end abutting against the slider.

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