CN111412128B - A linear peristaltic pump - Google Patents

Abstract

The invention relates to a linear peristaltic pump, which comprises a pump shell, a tube pressing device and a driving device, wherein a hose penetrates through the pump shell, the tube pressing device is arranged in the pump shell, and the driving device drives the tube pressing device; the pipe pressing device and the axial direction of the hose form a first set included angle; the driving device drives the pipe pressing device to press and release the hose in the radial direction of the hose. The linear peristaltic pump has the advantages of simple structure, good practicability, low cost and convenience for wide popularization and application.

Description

A linear peristaltic pump

Technical Field

The present invention relates to a peristaltic pump, and more particularly to a linear peristaltic pump.

Background technique

In the prior art, peristaltic pumps are a new type of liquid delivery pump. Compared with traditional rotor pumps, diaphragm pumps, and centrifugal pumps, peristaltic pumps do not need to come into direct contact with liquids to cause pollution, and have the characteristics of high precision and small size. They have been widely promoted and applied in various industries such as medical treatment, medicine, food, beverages, chemicals, and smelting. However, existing peristaltic pumps still have some shortcomings, such as short service life, large size, low precision, high cost, and inconvenient disassembly and assembly, which cannot meet market demand.

Existing peristaltic pumps usually adopt two structural forms: rotary peristaltic pumps and linear peristaltic pumps. For example, the public document with application number CN201821720567.6 discloses a rotary quick-install peristaltic pump. The roller group is driven by a motor to rotate, and the pipeline is squeezed continuously to realize the delivery of liquid. Two groups of roller groups with different rotation diameters are designed, which can directly replace the roller group with a small diameter after the hose is worn out after long-term work, which is convenient for replacement and prolongs the service life. However, this solution still has the problems of large volume and low precision. In this solution, the friction between the motor shaft and the roller group is used to drive the roller group to rotate and squeeze the pipeline, but when the motor shaft and the roller group transmit torque, it is easy to slip, resulting in unstable pumping and greatly insufficient precision. Another example is the public document with application number CN201621359731.6, which discloses a peristaltic pump that is easy to disassemble and assemble. This solution adopts a rotary structure, and the driver drives the roller to squeeze the pipeline to transport the liquid. In this solution, the hose is installed on the card assembly. When the hose needs to be replaced, the hose can be quickly disassembled and assembled by rotating the card assembly. The peristaltic pump has a simple structure, low cost, and convenient disassembly and assembly. However, this design still has the problem that the driver is prone to slipping when driving the roller to rotate, resulting in low precision.

The public document with application number CN201821612866.8 discloses a linear peristaltic pump roller transmission device. In this solution, a linear motor is used as a guide component to drive the roller, which has good synchronization and high transmission accuracy, and can solve the problem of poor pumping accuracy. However, this type of design has the problem of high cost and inconvenience in disassembling and replacing the pipeline. This solution requires the use of high-precision components such as linear motors and screw rods to achieve it, and the processing and assembly accuracy of the overall solution are also required to be high, resulting in a high overall cost, and the pipeline cannot be quickly and conveniently disassembled and replaced, resulting in it not being widely promoted and applied. Another example is the public document with application number CN201720890433.8, which discloses a linear reciprocating peristaltic pump. This solution uses the curve of the cam mechanism to control the lifting and lowering movement of the hose assembly and the cover assembly and the clamping movement of the anti-backflow device, and the pumping is performed by the tube pressing roller. This design has low cost and stable transmission. However, there are still problems of short service life, large volume, and low pumping accuracy.

Therefore, how to design a peristaltic pump with long service life, high precision, low cost, and easy disassembly and assembly is a technical problem that technical personnel in this field currently need to solve.

Summary of the invention

The technical problem to be solved by the present invention is to provide an improved linear peristaltic pump.

The technical solution adopted by the present invention to solve its technical problem is: constructing a linear peristaltic pump, including a pump housing for a hose to pass through, a tube pressing device arranged in the pump housing, and a driving device for driving the tube pressing device; the tube pressing device is arranged at a first set angle with the axial direction of the hose; the driving device drives the tube pressing device to perform reciprocating motion of squeezing and releasing the hose in the radial direction of the hose.

Preferably, the tube pressing device comprises a pressing piece which is obliquely arranged in the pump housing and forms the first set angle with the axial direction of the hose so as to reciprocally press and release the hose in the radial direction of the hose.

Preferably, the pressing sheet is an elastic pressing sheet.

Preferably, the tube pressing device further comprises a lifting mechanism, and the lifting mechanism is connected to the driving device and the pressing sheet, and is driven by the driving device to drive the pressing sheet to reciprocately squeeze and release the hose.

Preferably, the lifting mechanism comprises a crank slider assembly disposed in the pump housing and capable of reciprocating and swinging within a second set angle to drive the pressing sheet to squeeze and release the hose;

The crank slider assembly comprises a crank connected to the driving device at one end, and a slider arranged at the other end of the crank and connected to the crank and the pressing sheet and capable of sliding toward the hose;

The driving device comprises a driving motor which can rotate forward and reverse.

Preferably, the driving device comprises an electromagnet mechanism which generates electromagnetic induction with the tube pressing device in a power-on state and drives the tube pressing device to squeeze the hose in the radial direction of the hose;

The lifting mechanism comprises a sliding block driven by the electromagnet mechanism to reciprocate radially toward the hose through electromagnetic induction.

Preferably, the linear peristaltic pump further comprises a guide assembly for providing movement to the tube pressing device;

The guide assembly comprises a guide groove which is arranged on the inner side wall of the pump housing and extends radially toward the hose to guide the sliding block.

Preferably, the linear peristaltic pump further comprises a check device arranged on the hose to prevent fluid backflow;

The non-return device comprises a one-way valve or a pinch valve.

Preferably, the linear peristaltic pump further comprises two fixed pipe clamps separately arranged at two ends of the pump housing to fix the hose.

Preferably, there are multiple hoses, which are arranged side by side in the pump housing; there are multiple driving devices and multiple pipe pressing devices, which are arranged corresponding to the hoses;

Alternatively, there is one hose, and there are multiple driving devices and multiple pipe pressing devices. The multiple driving devices are arranged in a one-to-one correspondence with the multiple pipe pressing devices and can be driven one by one; the multiple pipe pressing devices are arranged on the hose at intervals.

The implementation of the linear peristaltic pump of the present invention has the following beneficial effects: the linear peristaltic pump drives the tube pressing device arranged in the pump housing and arranged at a first set angle with the axial direction of the hose to perform reciprocating motion of squeezing or releasing the hose in the radial direction of the hose through the driving device, so that the liquid in the hose can be pumped out, achieving stable liquid delivery, reducing the generation of pulses when pumping liquid, ensuring smooth liquid delivery, and improving the accuracy of pumping liquid. In addition, the tube pressing device reciprocates in the radial direction of the hose, reducing the contact area and contact time with the hose, not easily causing wear of the hose, and ensuring the service life of the peristaltic pump. The linear peristaltic pump has the characteristics of long service life, small size, high precision, low cost, and easy disassembly and assembly.

In addition, the pressing plate of the tube pressing device can be driven by the lifting mechanism to perform a cyclic lifting motion, squeezing the hose to realize the liquid transportation. The lifting mechanism can greatly reduce the volume of the peristaltic pump, ensuring the miniaturization of the linear peristaltic pump. At the same time, the linear peristaltic pump has a simple structure, good practicality, low cost, and is easy to be widely promoted and applied.

A cyclic lifting and lowering lifting mechanism is designed to drive the pressing piece to squeeze the hose. When the driving device drives the tube pressing device to pump liquid, there will be no slippage between the hose and the tube pressing device, thereby improving the accuracy of the peristaltic pump. At the same time, there is no need for friction between the tube pressing device and the hose to pump liquid, and when the peristaltic pump is not working, the tube pressing device will not squeeze the hose, thereby reducing the wear of the hose and extending the service life of the peristaltic pump.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

FIG1 is a schematic structural diagram of a first embodiment of a linear peristaltic pump according to the present invention;

2 is a schematic structural diagram of a second embodiment of a linear peristaltic pump according to the present invention;

3 is a schematic structural diagram of a third embodiment of a linear peristaltic pump according to the present invention;

4 is a schematic structural diagram of a fourth embodiment of a linear peristaltic pump according to the present invention;

5 is a schematic structural diagram of a fifth embodiment of a linear peristaltic pump according to the present invention;

Among them, the pump housing 10; the pump body 11; the pump cover 12; the hose 20; the driving device 30; the pipe pressing device 40; the pressing plate 41; the crank slider assembly 42; the crank 421; the slider 422; the guide assembly 50; the check device 60; and the fixed pipe clamp 70.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

FIG1 shows a first embodiment of a linear peristaltic pump of the present invention. The linear peristaltic pump can be a purely mechanical device or an electromechanical combination device, which can be used to pump liquids. It can be designed to be miniature as required and can ensure the available stroke. The linear peristaltic pump has the characteristics of long service life, small size, high precision, low cost, and easy disassembly and assembly.

As shown in FIG. 1 , further, in this embodiment, the linear peristaltic pump may include a pump housing 10, a drive device 30, and a tube pressing device 40. The pump housing 10 may be used for the hose 20 to pass through, and the hose 20 may be arranged in a straight line in the pump housing 10. The drive device 30 may be arranged in the pump housing 10, and it may drive the tube pressing device 40 to squeeze the hose 20. It can be understood that in some other embodiments, the drive device 30 is not limited to being arranged in the pump housing 10, and it may also be arranged on the outside of the pump housing 10. The tube pressing device 40 may be arranged in the pump housing 10, and it may be arranged at a first set angle with the axial direction of the hose 20, and it may be driven by the drive device 30 to perform reciprocating motion of squeezing and releasing the hose 20 in the radial direction of the hose 20. In this embodiment, the hose 20 may be one, and the drive device 30 and the tube pressing device 40 may be a group, and the drive device 30 and the tube pressing device 40 are arranged correspondingly.

Further, in the present embodiment, the pump housing 10 may include a pump body 11 and a pump cover 12. The pump body 11 may be a hollow structure, and a receiving cavity may be formed inside thereof. An opening may be provided at the top of the pump body 11, and the opening may be used for various components to be installed in the receiving cavity. Through holes may be provided on the two oppositely arranged side walls of the pump body 11, and the through holes may be used for the hose 20 to pass through. A hose mounting groove may be provided on the inside of the pump body 11 for the hose to be installed, and the hose mounting groove may be provided on the bottom wall of the pump body 11. It can be understood that in some other embodiments, the hose mounting groove may be omitted. The pump cover 12 is provided on the pump body 11, and it may be detachably provided with the pump body 11, and it may cover the opening.

Furthermore, in this embodiment, the hose 20 can be used to transport liquids, gases and solid-liquid mixtures, and the materials used can be one or more of silicone rubber, rubber, polytetrafluoroethylene, and synthetic materials. Different materials have different properties and can meet different usage occasions, facilitating wider promotion and use.

Further, in the present embodiment, the driving device 30 can be a rotary driving device. Specifically, it can be a reversible driving motor, which can be used to drive the tube pressing device 40 to reciprocate, and its driving method is simple and easy to operate, which can meet the use of more occasions, and it cooperates with the tube pressing device 40 to achieve the high-precision requirements of the peristaltic pump. It can be understood that in some other embodiments, the driving device is not limited to a rotary driving device, and it can be a linear driving device, such as a hydraulic driving device, an electric driving device, and specifically, it can be a cylinder, or an electric driving device formed by a gear, a motor and a rack. The driving motor can be installed in the pump body 11 of the pump housing 10. Of course, it can be understood that in some other embodiments, it can be installed on the outside of the pump housing 10, and its output shaft can penetrate into the pump body 11 from the outside of the pump housing 10.

Further, in the present embodiment, the tube pressing device 40 may include a pressing plate 41 and a lifting mechanism. The pressing plate 41 may be tilted in the pump housing 10 and be at a first set angle with the axial direction of the hose 20, and may reciprocately squeeze and release the hose 20 in the radial direction of the hose 20. It should be noted that the first set angle may be an acute angle, and by adopting an inclined structural design, it is convenient to smoothly squeeze out the liquid in the hose, and in the process of squeezing the hose, the contact time and contact area with the tube pressing device 40 may be effectively reduced, thereby ensuring the service life of the peristaltic pump and increasing the pumping efficiency. In the present embodiment, the pressing plate 41 is an elastic pressing plate, and specifically, the pressing plate 41 may be a spring pressing plate. Of course, it is understandable that in some other embodiments, the pressing plate 41 is not limited to a spring pressing plate, and it may be an alloy pressing plate, a plastic pressing plate, a rubber pressing plate, etc. It is understandable that a protective cover, such as a silicone protective cover, a plastic protective cover, etc., may also be provided at the position where the pressing plate 41 contacts the hose 20 to avoid unnecessary wear of the hose 20 by the pressing plate 41.

The lifting mechanism can be arranged in the pump housing 10 and can be connected to the driving device 30 and the pressing plate 41. It can be driven by the driving device 30 to lift and lower back and forth along the radial direction of the hose 20, thereby driving the pressing plate 41 to lift and lower cyclically, and reciprocatingly squeeze and release the hose 20.

Further, in this embodiment, the lifting mechanism may be a crank slider assembly 42; of course, it is understandable that in some other embodiments, the lifting mechanism may not be limited to the crank slider assembly 4242, and it may be a slider mechanism, a cam mechanism, a gear mechanism, a ratchet mechanism, etc. The lifting mechanism has the characteristics of small size, simple principle, and easy implementation. In this embodiment, the crank slider assembly 42 may be arranged in the pump housing 10, and it may swing back and forth within the second setting angle, thereby driving the pressing sheet 41 to squeeze and release the hose 20. In some embodiments, the crank slider assembly 42 may include a crank 421 and a slider 422. One end of the crank 421 may be connected to the driving device 30, and the other end may be connected to the slider 422. Specifically, the crank 421 may include a first rod body and a second rod body rotatably connected to the first rod body; the first rod body may be connected to the drive motor, and it may be driven by the drive motor to reciprocate within the second setting angle, thereby driving the second rod body to reciprocate. The second rod body can be rotatably connected to the slider 422, and can drive the slider 422 to reciprocate along the radial direction of the hose 20. It should be noted that the second set angle can be an obtuse angle. The slider 422 can be slidably arranged, and can be fixedly connected to one end of the pressing plate 41, and can slide in a direction perpendicular to the hose 20, thereby driving the pressing plate to squeeze or release the hose 20 in the direction of the hose 20.

Further, in the present embodiment, the linear peristaltic pump may further include a guide assembly 50, which may be disposed in the pump housing 10. Specifically, in some embodiments, the guide assembly 50 may be mounted on the inner side wall of the pump body 10, which may guide the movement of the tube pressing device 40. Specifically, in the present embodiment, the guide assembly 50 may be a guide groove. The guide groove may be disposed on the inner side wall of the pump housing 10, and may be extended radially toward the hose 20, which may provide a slider 422 for sliding therein, thereby guiding the slider 422. It is understandable that in some other embodiments, the guide assembly 50 may not be limited to the guide groove, and may be a guide rail, and the slider 422 may be sleeved on the guide rail for sliding.

Further, in the present embodiment, the linear peristaltic pump may further include a check device 60. The check device may be provided on the hose 20, and may be located downstream of the pressing plate 41, and may be used to prevent fluid backflow. In the present embodiment, the check device 60 may be a one-way valve. It is understandable that in some other embodiments, the check device 60 may not be limited to a one-way valve, and may be a pinch valve or other devices. By providing the check device 60, the liquid can flow in only one direction without backflow, reduce the generation of pulses, and ensure the smoothness of the liquid flow.

Furthermore, in this embodiment, the linear peristaltic pump may also include a fixed pipe clamp 70. The fixed pipe clamp 70 may be two, which may be respectively arranged at the two ends of the pump housing 10, which may be clamped on the hose 20, and detachably connected to the hose 20, which may effectively fix the hose 20 and facilitate the replacement of the hose 20. During installation, the hose 20 may be inserted into the pump housing 10 from the through hole at one end of the pump housing 10, and may be passed out from the through hole at the other end of the pump housing 10, and then the two fixed pipe clamps 70 may be respectively placed at the two ends of the pump housing 10, and located on the outside of the pump housing 10, and clamped on the hose 20.

When the linear peristaltic pump of this embodiment is used, the hose 20 passes through the through holes on the two sides of the pump body 11, passes through the hose installation groove inside the pump body 11, and is connected to the one-way valve; then the fixed pipe clamp 70 is placed at both ends of the pump housing 10, and is located on the outside of the pump housing 10, and is clamped on the hose 20. The pressing sheet 41 is fixed to the slider 422 of the crank slider assembly 42, and the slider 422 is placed in the guide groove, and then one end of the crank of the crank slider assembly 42 is connected and fixed to the rotating shaft of the driving motor, and is driven to rotate by the driving motor. Then the pump cover 12 is fixed to the pump body 11 by screw fastening.

The driving motor rotates forward, and the crank of the crank slider assembly 42 rotates under the driving motor, and then drives the slider to reciprocate along the guide groove, thereby driving the pressing plate 41 to squeeze the hose 20 in the radial direction. Since the pressing plate 41 adopts an inclined structural design, its right side first contacts the hose 20. During the downward movement of the pressing plate 41, the pressing plate 41 radially pressurizes the hose 20 from right to left until the pressing plate 41 is completely in contact with and squeezes the hose 20. The liquid flows from right to left to the one-way valve during the squeezing. The driving motor is reversed. Of course, the driving motor can also rotate continuously. Driven by the crank slider structure, the pressing plate 41 moves upward along the guide groove with the slider 422 to leave the hose 20, causing negative pressure to the hose 20 that has just been squeezed. Because a one-way valve is provided on the left side of the hose 20, the one-way valve only allows gas and liquid to flow from right to left. The liquid on the right side of the hose 20 will refill the place that has just been squeezed to the left. Driven by the crank slider assembly 42, the pressing piece 41 reciprocates up and down, repeatedly squeezes the hose 20, and makes the liquid flow from right to left in sequence. When the speed of the driving motor reaches a certain value, the pressing piece 41, driven by the crank slider assembly 42, will quickly squeeze the hose 20, so that the liquid flows very smoothly, greatly reducing the generation of pulses and ensuring the stability of the peristaltic pump. At the same time, the crank slider assembly 42 has a quick return characteristic. When the speed of the driving motor is constant, the speed of the pressing piece 41 moving upward is faster than the speed of moving downward, so that after the hose 20 is squeezed, the liquid has enough time to fill the hose 20, ensuring the continuity of the peristaltic pump when pumping liquid, and at the same time ensuring the accuracy of the peristaltic pump under the squeezing of the pressing piece 41. The use of the crank slider assembly 42 with a simple working principle and strong practicality can not only meet the above requirements, but also achieve miniaturization, so that the volume of the peristaltic pump is greatly reduced, and the cost is relatively low.

When pumping liquid, the pressing piece 41 will only squeeze a small section of the hose 20 steadily, and it is not easy to cause wear to the hose 20. At the same time, when the peristaltic pump is not working, the pressing piece 41 will not squeeze the hose 20, which greatly improves the service life of the peristaltic pump. A fixed pipe clamp 70 is designed to fix the hose 20. When the hose 20 needs to be replaced, it is only necessary to remove the fixed pipe clamps 70 on both sides of the pump body 11, and directly pull out the hose 20 for replacement. The operation is simple and it is convenient to disassemble and replace the pipeline.

In summary, the linear peristaltic pump not only improves the accuracy and stability of the peristaltic pump when pumping liquid, but also ensures its advantages of long service life, low cost, easy disassembly and assembly, and applicability to a variety of occasions.

FIG. 2 shows a second embodiment of the linear peristaltic pump of the present invention. The difference between the second embodiment and the first embodiment is that the driving device may include an electromagnet mechanism, not limited to a driving motor. The electromagnet mechanism may be arranged on the inner side wall of the pump housing 10, and may generate electromagnetic induction with the tube pressing device 40 in the energized state to drive the tube pressing device 40 to squeeze the hose 20 in the radial direction of the hose 20. The electromagnet mechanism may include an electromagnet, which may be connected to an external power supply, which may be arranged on one side of the guide groove and located at the upper part of the pump body 11. The lifting mechanism may only include a slider 422, which may be placed in the guide groove, one end of which may pass through the side wall of the guide groove, and one end of which may pass through the guide groove may be connected to the electromagnet mechanism through electromagnetic induction, and the slider 422 may reciprocate radially toward the hose 20 under the drive of the electromagnet mechanism through battery induction. In this embodiment, the check device 60 may adopt a pinch valve, not limited to a one-way valve.

When in use, the pressing piece 41 can be fixed on the slider 422, and the electromagnet of the electromagnet mechanism is energized to generate electromagnetic force. Under the action of the electromagnetic force, the slider 422 moves downward along the guide groove with the pressing piece 41 until the hose 20 is completely squeezed by 41. After the liquid is pumped out from right to left, the electromagnet mechanism is closed, the electromagnetic force disappears, and the electromagnet mechanism is reset. The pressing piece 41 and the slider 422 move upward along the chute 12 under the elastic force of the pressing piece 41 until the pressing piece 41 returns to the initial state. The negative pressure generated after the hose 20 is squeezed is filled in time by the liquid on the right side of the hose 20. The repeated operation of the electromagnet mechanism causes the pressing piece 41 to repeatedly move in a straight line up and down under the drive of the slider 422, and repeatedly squeezes the hose 20, realizing the non-stop pumping of the peristaltic pump. The designed electromagnet mechanism 22 can realize the cyclic lifting movement of the peristaltic pump under a very small volume, greatly reducing the volume of the peristaltic pump and ensuring the miniaturization of the peristaltic pump.

FIG3 shows a third embodiment of the linear peristaltic pump of the present invention, which is different from the second embodiment. The pressing sheet 41 is a plastic pressing sheet, and two sets of pipe pressing devices 40 and driving devices 30 can be designed on one hose 20; the two sets of pipe pressing devices 40 and driving devices 30 can be arranged on the hose 20 at intervals, and one of them can be driven. It can be understood that in some other embodiments, the pipe pressing device 40 and the driving device 30 are not limited to two, and they can be multiple. The driving device 30 is arranged one by one with the pipe pressing device 40, and the pressing sheet 41 in each set of pipe pressing device 40 can be driven by the lifting mechanism corresponding to it to reciprocate up and down in the radial direction of the hose 20. The pressing sheets 41 of the two sets of pipe pressing devices 40 can be fixed above the hose 20 in a cascade manner. The two driving devices 30 can be electromagnet mechanisms, and the two electromagnet mechanisms can act asynchronously in sequence, driving the corresponding pressing sheets 41 to squeeze the hose 20 in sequence, thereby greatly improving the efficiency of the pump liquid, which is suitable for high-power occasions.

FIG4 shows a fourth embodiment of the linear peristaltic pump of the present invention, which is different from the third embodiment in that a plurality of tube pressing devices 40 and driving devices 30 can be provided on a hose 40, and the driving devices 30 are provided one-to-one with the tube pressing devices 40, and the hose 20 can be repeatedly squeezed by the plurality of tube pressing devices 40. The driving device 30 can be an electromagnet mechanism, and the plurality of electromagnet mechanisms can be asynchronously staggered driven. After the first pressing sheet 41 squeezes the hose 20, the following pressing sheets 41 can perform squeezing actions in sequence. In this embodiment, the liquid can be continuously flowed from one side of the hose 20 to the other side without a check device, thereby completing the liquid delivery. This embodiment is simple and suitable for a variety of occasions.

FIG5 shows a fifth embodiment of the linear peristaltic pump of the present invention, which is different from the second embodiment in that two hoses 20 can be designed in parallel and in parallel in the pump housing 10. It can be understood that in some embodiments, the number of the hoses 20 is unlimited. Each hose 20 can be connected to a set of pipe pressing devices 40, and each pipe pressing device 40 is driven by an electromagnet mechanism, which does not affect each other, so that multiple pipelines can be used to transport liquids at the same time. In addition, the liquid transportation of each hose 20 can be driven separately by the corresponding driving device 30, so that different hoses 20 can transport liquids at different speeds, ensuring the multi-purpose use of the peristaltic pump.

It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims (10)

1. A linear peristaltic pump, characterized in that it comprises a pump housing (10) for a hose (20) to pass through, a tube pressing device (40) arranged in the pump housing (10), and a driving device (30) for driving the tube pressing device (40); the tube pressing device (40) is arranged to form a first set angle with the axial direction of the hose (20); the driving device (30) drives the tube pressing device (40) to perform a reciprocating motion in the radial direction of the hose (20) to squeeze and release the hose (20). 2. The linear peristaltic pump according to claim 1 is characterized in that the tube pressing device (40) includes a pressing piece (41) which is obliquely arranged in the pump housing (10) and forms the first set angle with the axial direction of the hose (20) so as to reciprocally squeeze and release the hose (20) in the radial direction of the hose (20). 3. The linear peristaltic pump according to claim 2 is characterized in that the pressing sheet (41) is an elastic pressing sheet. 4. The linear peristaltic pump according to claim 2 is characterized in that the tube pressing device (40) also includes a lifting mechanism, and the lifting mechanism is connected to the driving device (30) and the pressing plate (41), and is driven by the driving device (30) to drive the pressing plate (41) to reciprocately squeeze and release the hose (20). 5. The linear peristaltic pump according to claim 4, characterized in that the lifting mechanism comprises a crank slider assembly (42) arranged in the pump housing (10) and capable of reciprocating within a second set angle to drive the pressing plate (41) to squeeze and release the hose (20); The crank slider assembly (42) comprises a crank (421) connected to the driving device (30) at one end, and a slider (422) arranged at the other end of the crank (421) and connected to the crank (421) and the pressing plate (41) and capable of sliding toward the hose (20); The driving device (30) comprises a driving motor which can rotate forward and reverse. 6. The linear peristaltic pump according to claim 4, characterized in that the driving device (30) comprises an electromagnet mechanism which generates electromagnetic induction with the tube pressing device (40) in a powered state to drive the tube pressing device (40) to squeeze the hose (20) in the radial direction of the hose (20); The lifting mechanism comprises a sliding block (422) driven by the electromagnet mechanism to reciprocate radially toward the hose (20) through electromagnetic induction. 7. The linear peristaltic pump according to claim 5 or 6, characterized in that the linear peristaltic pump further comprises a guide assembly (50) for moving the tube pressing device (40); The guide assembly (50) comprises a guide groove which is arranged on the inner side wall of the pump housing (10) and extends radially toward the hose (20) to guide the sliding block (422). 8. The linear peristaltic pump according to claim 1, characterized in that the linear peristaltic pump further comprises a non-return device (60) arranged on the hose (20) to prevent fluid backflow; The non-return device (60) comprises a one-way valve or a pinch valve. 9. The linear peristaltic pump according to claim 1, characterized in that the linear peristaltic pump further comprises two fixed pipe clamps (70) separately arranged at two ends of the pump housing (10) to fix the hose (20). 10. The linear peristaltic pump according to claim 1, characterized in that there are a plurality of the hoses (20), and the plurality of the hoses (20) are arranged side by side in the pump housing (10); there are a plurality of the driving devices (30) and the pipe pressing devices (40), and they are arranged corresponding to the hoses (20); Alternatively, the hose (20) is one, the driving device (30) and the pipe pressing device (40) are both multiple, the multiple driving devices (30) and the multiple pipe pressing devices (40) are arranged in a one-to-one correspondence and can be driven one by one; the multiple pipe pressing devices (40) are arranged on the hose (20) at intervals.