Closed-loop stepping motor peristaltic pump

Abstract

The invention relates to a closed-loop stepping motor peristaltic pump which comprises a stepping motor, a peristaltic pump body and a peristaltic pump pipe, and the peristaltic pump body is fixedly connected with the stepping motor and is driven by the stepping motor to rotate around a rotating axis; the peristaltic pump pipe is connected with the peristaltic pump body in an abutting mode, and fluid in the peristaltic pump pipe is driven to flow when the peristaltic pump body rotates. The peristaltic pump body comprises a rotating part and a plurality of rotors, the rotating part is fixedly connected with the stepping motor and rotates around a rotating axis along with rotation of the stepping motor, and a plurality of through holes are formed in the rotating part; the rotor is arranged between the through holes of the rotating part, one end of the rotor makes contact with the peristaltic pump pipe in a pressing mode, and the rotor rotates around the rotating axis along with the rotating part and rotates. The closed-loop stepping motor peristaltic pump has smaller abrasion, parts of the closed-loop stepping motor peristaltic pump can be replaced after the closed-loop stepping motor peristaltic pump is abraded, and the service life of the closed-loop stepping motor peristaltic pump is greatly prolonged.

Description

Technical Field

[0001] The invention relates to the field of encoding machinery, in particular to a closed-loop stepping motor peristaltic pump. Background Art

[0002] In the absence of spontaneous power, transporting fluids usually requires a pump as a power source. Pumps come in many forms and types. Among them, peristaltic pumps that do not directly contact the fluid can completely avoid contact contamination of the pump to the fluid and erosion of the fluid to the pump. They also have easily replaceable peristaltic pump tubes, and have therefore made great progress in recent years.

[0003] With reference to the patent with publication number "CN205025736U", the existing peristaltic pump includes a motor drive board, a stepper motor, a peristaltic pump body, a peristaltic pump tube and a pump body front cover, wherein the motor drive board is connected to the stepper motor, receives an external control signal and drives the stepper motor to rotate according to the control signal; the peristaltic pump body is fixedly connected to the stepper motor and is driven to rotate by the stepper motor; the peristaltic pump tube is abuttingly connected to the peristaltic pump body, and the internal fluid thereof can be driven to flow when the peristaltic pump body rotates; the pump body front cover is fixedly connected to the peristaltic pump body, and the peristaltic pump tube is sealed between the pump body front cover and the peristaltic pump body. Among them, the peristaltic pump body includes a rotating part and two rollers, the two rollers are respectively arranged on both sides of the rotating part, and are connected to the rotating part at the axis position of the rollers, so that the rollers can rotate around the axis, and the two rollers are symmetrically arranged with the rotating axis of the rotating part as the symmetry axis; the rotating part is connected to the stepper motor, and when the stepper motor rotates, it drives the rotating part to rotate synchronously, and the two rollers also rotate synchronously with the rotating part around the axis of the rotating part, and squeeze the peristaltic pump tube to force the fluid inside the peristaltic pump tube to move.

[0004] However, the existing peristaltic pump has a short service life, resulting in the advantage of the peristaltic pump tube being replaceable to extend the overall service life not being prominent. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a closed-loop stepper motor peristaltic pump that can reduce its own wear and tear, and its own parts can be replaced after wear and tear, thereby greatly extending the service life and saving costs.

[0006] A closed-loop stepper motor peristaltic pump comprises: a stepper motor, a peristaltic pump body and a peristaltic pump tube, wherein the peristaltic pump body is fixedly connected to the stepper motor and driven by the stepper motor to rotate around a rotation axis; the peristaltic pump tube is abuttingly connected to the peristaltic pump body, and the fluid inside the peristaltic pump tube is driven to flow when the peristaltic pump body rotates; the peristaltic pump body comprises a rotating part and a plurality of rotors, wherein the rotating part is fixedly connected to the stepper motor and rotates around the rotation axis following the rotation of the stepper motor, and a plurality of through holes are provided on the rotating part; the rotor is arranged between the through holes of the rotating part, and one end of the rotor is in pressing contact with the peristaltic pump tube, and the rotor rotates around the rotation axis and rotates on its own following the rotating part.

[0007] Compared with the peristaltic pumps in the prior art, the rotor in the closed-loop stepper motor peristaltic pump of the present application not only revolves around the rotation axis following the rotation of the stepper motor, but also rotates around its own central axis, so that the contact position between the rotor and the peristaltic pump tube can be changed, and the contact surface is evenly worn, thereby increasing the service life; and the rotor that is not fixedly connected to the rotating part can be replaced after wear occurs, further extending the service life of the closed-loop stepper motor peristaltic pump of the present application.

[0008] Furthermore, the rotating part includes a supporting layer, a connecting shaft and a limiting layer, the connecting shaft is arranged between the supporting layer and the limiting layer, and fixedly connects the supporting layer and the limiting layer; the center position of the supporting layer is located on the rotating axis, and a certain size of hollowing is provided at the center position so that the motor shaft can pass through the supporting layer; the interior of the connecting shaft has a hollow part so that the motor shaft can pass through the interior of the connecting shaft; the connecting shaft is provided with a through hole, and the rotating part and the motor shaft of the stepper motor are fixed together by screws passing through the through hole and the screw holes provided on the motor shaft, so that the rotating part rotates following the rotation of the motor shaft.

[0009] Furthermore, the supporting layer and the restricting layer are both provided with a plurality of through holes, the rotor comprises a clamping end, a cylinder and a friction end, the cylinder connects the clamping end and the friction end, the clamping end passes through the through hole on the supporting layer of the rotating part, and the friction end passes through the through hole on the restricting layer of the rotating part, so that the rotor can rotate freely around the central axis of the cylinder.

[0010] Furthermore, the maximum cross-sectional area of ​​the clamping end of the rotor is larger than the through hole area on the supporting layer, and the maximum cross-sectional area of ​​the friction end of the rotor is larger than the through hole area on the restricting layer, so that the rotor is restricted in the rotating part.

[0011] Furthermore, the peristaltic pump body also includes a base, the base has a hollow portion inside, the rotating part is arranged between the hollow portions of the base, and the sizes of the supporting layer and the limiting layer are both smaller than the size of the hollow portion of the base.

[0012] Furthermore, it also includes a pump body front cover, which is fixedly connected to the peristaltic pump body, and the peristaltic pump tube is sealed between the pump body front cover and the peristaltic pump body.

[0013] Furthermore, one side of the front cover of the pump body has a protrusion, which contacts the restriction layer and has a size larger than that of the peristaltic hose but not larger than that of the restriction layer, so that the peristaltic hose can be completely restricted within the protrusion.

[0014] Furthermore, the limiting layer has a protrusion on one side of the center position, and the pump body front cover also has a depression at the center position. A limiting bearing is also provided between the depression and the protrusion of the limiting layer. The size of the limiting bearing is smaller than the size of the pump body front cover and larger than the size of the limiting layer to limit the swing of the rotating part during rotation.

[0015] Furthermore, it also includes an encoder and a processor, wherein the encoder is connected to the stepper motor to encode the rotation step of the stepper motor; the processor is connected to the encoder to calculate the flow in the peristaltic pump tube according to the encoding value and the number of rotors to monitor the flow in the peristaltic pump tube in real time.

[0016] Furthermore, it also includes an encoder and a processor, wherein the encoder is connected to the stepper motor to encode the rotation step of the stepper motor; the processor is connected to the encoder, and according to the relationship between the encoding value, the number of rotors and the flow rate in the peristaltic pump tube, the encoder is controlled by the processor to control the rotation speed of the stepper motor, so as to realize the flow control in the peristaltic pump tube.

[0017] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the closed-loop stepper motor peristaltic pump structure of the present application.

[0019] Figure 2 This is a schematic diagram of the base structure of the closed-loop stepper motor peristaltic pump of the present application.

[0020] Figure 3 This is a schematic diagram of the structure of the rotating part of the closed-loop stepper motor peristaltic pump of the present application.

[0021] Figure 4 This is a schematic diagram of the rotor seat structure of the closed-loop stepper motor peristaltic pump of the present application.

[0022] Figure 5 This is a schematic diagram of the rotor structure of the closed-loop stepper motor peristaltic pump of the present application.

[0023] Figure 6 This is a schematic diagram of the peristaltic pump tube structure of the closed-loop stepper motor peristaltic pump of the present application.

[0024] Figure 7 This is a schematic diagram of the pump body front cover structure of the closed-loop stepper motor peristaltic pump of the present application. DETAILED DESCRIPTION

[0025] The applicant carefully analyzed the peristaltic pump of the prior art and found that the reason for its short service life is the long-term friction between the roller and the peristaltic pump tube. Although the peristaltic pump tube can be replaced after wear, the roller that cannot be replaced will weaken the driving effect on the fluid after wear, and the damage to the peristaltic pump tube will be strengthened, resulting in the peristaltic pump being unable to continue to be used. Therefore, the applicant tried to set a rotor shaft and a rotor. The rotor replaces the roller and is connected to the peristaltic pump tube in a conflicting manner. However, the rotor is not directly fixed on the rotating part, but is fixed to the rotating part through the rotor shaft, thereby achieving the replaceability of the rotor. However, since the material of the peristaltic pump tube is not fixed, the material of the rotor cannot always be the same as that of the peristaltic pump tube, so it is difficult to keep the wear rate of the two consistent. For this reason, the applicant tried to set the rotor to freely contact inside the rotor shaft instead of fixed connection, so that the rotor can rotate inside the rotor shaft, thereby reducing the degree of wear on the rotor caused by the friction between the rotor and the peristaltic pump tube.

[0026] See also Figure 1 The closed-loop stepper motor peristaltic pump of the present application includes a stepper motor 10, a peristaltic pump body 20, a peristaltic pump tube 30, a pump body front cover 40, an encoder (not shown) and a processor (not shown). The peristaltic pump body 20 is fixedly connected to the stepper motor 10 and driven to rotate by the stepper motor 10; the peristaltic pump tube 30 is abuttingly connected to the peristaltic pump body 20, and the internal fluid can be driven to flow when the peristaltic pump body 20 rotates; the pump body front cover 40 is fixedly connected to the peristaltic pump body 20, and the peristaltic pump tube 30 is enclosed between the pump body front cover 40 and the peristaltic pump body 20.

[0027] The stepper motor 10 includes a motor body 11 and a motor shaft 12. The motor shaft 12 is connected to the motor body 11 and rotates along a rotation axis located at the center of the stepper motor 10 according to a control signal transmitted by the motor body 11. The motor body 11 also provides power to the motor shaft 12. The motor shaft 12 is provided with a screw hole.

[0028] The peristaltic pump body 20 includes a base 21, a rotating part 22, a plurality of rotor seats 23 and a plurality of rotors 24. The rotating part 22 is disposed inside the base 21, the rotor seat 23 is fixed on the rotating part 22, and the rotor 24 is disposed in the rotor seat 23.

[0029] See also Figure 2The center of the base 21 is located on the rotation axis, and the base 21 has an arch-shaped hollow part inside, and the center of the arc segment of the hollow part is located on the rotation axis; the outer shell of the base 21 is fixedly connected to the motor body 11 of the stepper motor 10 by screws, and the motor shaft 12 of the stepper motor 10 penetrates into the base 21 at the center of the arc segment of the hollow part of the base 21.

[0030] See also Figure 3 , the rotating part 22 is arranged between the hollow parts of the base 21 and is protected by the outer shell of the base 21. The rotating part 22 includes a supporting layer 221, a limiting layer 222 and a connecting shaft 223, and is in an I-shaped shape on the side. The connecting shaft 223 is arranged between the supporting layer 221 and the limiting layer 222, and the supporting layer 221 and the limiting layer 222 are fixedly connected by the connecting shaft 223. The supporting layer 221 is a disc, the center of which is located on the rotation axis, and there is a hollow of a certain size at the center position, which allows the motor shaft 12 to pass through the supporting layer 221; the limiting layer 222 is a flat plate, and there is a circular protrusion on one side of the center position; the connecting shaft 223 is a cylinder, and there is a cylindrical hollow part inside it, and the center axis of the hollow part is collinear with the rotation axis. The radius of the support layer 221 is smaller than the radius of the arc segment of the hollow part of the base 21, and the maximum distance of each location of the restriction layer 222 from the center position is smaller than the radius of the arc segment of the hollow part of the base 21. A through hole is provided on the connecting shaft 223, and the rotating part 22 is fixed to the motor shaft 12 of the stepping motor 10 by passing a screw through the through hole and the screw hole on the motor shaft 12, so that the rotating part 22 can rotate with the rotation of the motor shaft 12. In particular, a rotating bearing 51 is also provided on the side of the support layer 221 close to the stepping motor 10. The rotating bearing 51 is sleeved on the motor shaft 12, and is in the shape of a ring, with the center of the circle located on the axis of rotation, and is used to prevent the support layer 221 from directly contacting the motor body 11 of the stepping motor 10, resulting in huge wear. Lubricating oil is applied inside the rotating bearing 51 to reduce the wear of the rotating bearing 51 on the motor shaft 12. A gasket 60 is further provided between the rotary bearing 51 and the supporting layer 221 , and lubricating oil is applied to both sides of the gasket 60 to reduce the wear of the supporting layer 221 caused by the rotation.

[0031] See also Figure 4 The rotor seat 23 is a cylinder having a cylindrical hollow portion inside. The central axis of the hollow portion is colinear with the rotation axis. There are four rotor seats 23, which are evenly and symmetrically arranged between the support layer 221 and the limiting layer 222 of the rotating part 22 with the rotation axis as the symmetry axis to limit the position of the rotor 24.

[0032] See also Figure 5The rotor 24 is a cylinder, and the number of the rotor 24 corresponds to the number of the rotor seats 23. The rotor 24 includes a clamping end 241, a friction end 242 and a column 243. The clamping end 241 is located on the side close to the stepping motor 10 and passes through the through hole on the support layer 221 of the rotating part 22; the friction end 242 is located on the side close to the pump body front cover 40 and passes through the through hole on the restriction layer 222 of the rotating part 22; the column 243 connects the clamping end 241 and the friction end 242, and the column 243 of the rotor 24 is arranged in the hollow part inside the rotor seat 23; the cross-sectional area of ​​the clamping end 241 of the rotor 24 is larger than the through hole area on the support layer 221, and the cross-sectional area of ​​the friction end 242 of the rotor 24 is larger than the through hole area on the restriction layer 222, so that the rotor 24 is restricted in the rotor seat 23 and will not be separated from the rotor seat 23 during rotation. At the same time, the rotor 24 can rotate freely around the central axis of the column 243 inside the rotor seat 23. The shapes of the clamping end 241 and the friction end 242 of the rotor 24 are not limited and can be stepped or cylindrical, etc., as long as the rotor 24 does not fall off from the rotor seat 23. A clamping spring 70 is also provided between the clamping end 241 of the rotor 24 and the support layer 221 to prevent the rotor 24 from falling off from the rotor seat 23 and causing an operating failure. The bottom surface of the friction end 242 of the rotor 24 contacts the peristaltic pump tube 30 and rubs against the peristaltic pump tube 30 during operation.

[0033] It can be understood that the motor shaft 12 rotates around the rotation axis where its own center is located, the rotating part 22 rotates around the rotation axis where its own center is located following the motor shaft 12, the rotor seat 23 follows the rotating part 22 to make circular motion around the rotation axis, and the rotor 24 follows the rotation axis of the rotor seat 23 to make circular motion. The rotations of the motor shaft 12 and the rotating part 22 are both self-rotation, and the rotations of the rotor seat 23 and the rotor 24 are both revolution. In particular, since the rotor 24 is not fixedly arranged inside the rotor seat 23, when the rotor seat 23 drives the rotor 24 to revolve around the rotation axis, the rotor 24 is affected by the friction between itself 242 and the peristaltic pump tube 30, and the rotor 24 will also rotate with its own central axis as the rotation axis.

[0034] It is understandable that when the rotor 24 only revolves but does not rotate, the contact mode between the rotor 24 and the peristaltic pump tube 30 is fixed. Due to the influence of gravity and the shape of the peristaltic pump tube 30, the friction between the bottom surface of the friction end 242 of the rotor 24 and the peristaltic pump tube 30 is not uniform when the stepper motor 10 is working. Long-term operation will cause serious wear on the edge or center of the bottom surface of the friction end 242 of the rotor 24. Although other positions are fine, the rotor 24 needs to be replaced to work normally. When the rotor 24 can rotate while revolving, the friction between the bottom surface of the friction end 242 of the rotor 24 and the peristaltic pump tube 30 is more uniform, which prolongs its service life.

[0035] See also Figure 6 The peristaltic pump tube 30 includes a peristaltic hose 31 and two connectors 32. The peristaltic hose 31 is arranged in an arch shape on the restriction layer 222 and contacts the bottom surface of the friction end 242 of the rotor 24 for transporting fluid. The maximum distance between the edge of the peristaltic hose 31 and the rotation axis is less than the maximum distance between any point of the restriction layer 222 and the center position; the two connectors 32 are respectively connected to the openings at both ends of the peristaltic hose 31 for communicating with external pipelines, so that the closed-loop stepper motor 10 peristaltic pump of the present application can be suitable for various fluid transportation environments.

[0036] See also Figure 7 The pump body front cover 40 is a flat plate with a circular protrusion on one side. The height of the circular protrusion is greater than the thickness of the peristaltic hose 31, so that it contacts the restriction layer 222. It can be understood that the center of the circular protrusion of the pump body front cover 40 is located on the rotation axis, and its radius is greater than the maximum distance between the edge of the peristaltic hose 31 and the rotation axis, and is not greater than the maximum distance from the center position of the restriction layer 222, so that the peristaltic hose 31 is completely contained in the circular protrusion, forming a relatively closed space, reducing the volatilization of lubricating oil, and extending the service life. The pump body front cover 40 is fixedly connected to the base 21 by screws, and the peristaltic pump tube 30 is confined in the space between the pump body front cover 40 and the restriction layer 222. The pump body front cover 40 also has a circular depression at the center position, and a limiting bearing 52 is provided between the circular depression and the circular protrusion of the limiting layer 222. The limiting bearing 52 is annular, and its radius is smaller than the radius of the circular depression of the pump body front cover 40 and larger than the radius of the circular protrusion of the limiting layer 222, so as to prevent the rotating part 22 from swinging during rotation.

[0037] The encoder is connected to the stepper motor 10 and can encode the rotation step length of the stepper motor 10, thereby realizing the conversion between analog signals and digital signals, which is convenient for actual data processing.

[0038] The processor is connected to the encoder, and the flow rate in the peristaltic pump tube 30 is accurately calculated according to the code value and the number of rotors, so that the flow rate in the peristaltic pump tube 30 can be clearly monitored in real time. Similarly, according to the reverse use of the relationship between the code value, the number of rotors and the flow rate in the peristaltic pump tube 30, the encoder can be controlled by the processor, thereby controlling the speed of the stepper motor 10, and realizing accurate control of the flow rate in the peristaltic pump tube 30. It can be understood that when the number of rotors is greater, the calculation of the flow rate in the peristaltic pump tube 30 can be more precise.

[0039] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.

Claims

1. A closed-loop stepper motor peristaltic pump, characterized in that: include: A stepper motor, a peristaltic pump body and a peristaltic pump tube, wherein the peristaltic pump body is fixedly connected to the stepper motor and driven by the stepper motor to rotate around a rotation axis; the peristaltic pump tube is abuttingly connected to the peristaltic pump body, and the fluid inside the peristaltic pump tube is driven to flow when the peristaltic pump body rotates; the peristaltic pump body comprises a rotating part and a plurality of rotors, wherein the rotating part is fixedly connected to the stepper motor and rotates around the rotation axis following the rotation of the stepper motor, and a plurality of through holes are provided on the rotating part; the rotor is arranged between the through holes of the rotating part, and one end of the rotor is in pressing contact with the peristaltic pump tube, and the rotor rotates around the rotation axis and rotates on its own following the rotating part.

2. The closed-loop stepper motor peristaltic pump according to claim 1, characterized in that: The rotating part includes a supporting layer, a connecting shaft and a limiting layer, wherein the connecting shaft is arranged between the supporting layer and the limiting layer to fix the supporting layer and the limiting layer; the center position of the supporting layer is located on the rotating axis, and a certain size of hollowing is provided at the center position so that the motor shaft can pass through the supporting layer; the interior of the connecting shaft has a hollow part so that the motor shaft can pass through the interior of the connecting shaft; a through hole is provided on the connecting shaft, and the rotating part and the motor shaft of the stepping motor are fixed together by screws passing through the through hole and the screw holes provided on the motor shaft, so that the rotating part rotates following the rotation of the motor shaft.

3. The closed-loop stepper motor peristaltic pump according to claim 2, characterized in that: The supporting layer and the limiting layer are both provided with a plurality of through holes. The rotor comprises a clamping end, a column and a friction end. The column connects the clamping end and the friction end. The clamping end passes through the through hole on the supporting layer of the rotating part, and the friction end passes through the through hole on the limiting layer of the rotating part, so that the rotor can rotate freely around the central axis of the column.

4. The closed-loop stepper motor peristaltic pump according to claim 3, characterized in that: The maximum cross-sectional area of ​​the clamping end of the rotor is larger than the through hole area on the supporting layer, and the maximum cross-sectional area of ​​the friction end of the rotor is larger than the through hole area on the limiting layer, so that the rotor is limited in the rotating part.

5. The closed-loop stepper motor peristaltic pump according to claim 4, characterized in that: The peristaltic pump body further comprises a base, the interior of the base comprises a hollow portion, the rotating part is arranged between the hollow portions of the base, and the sizes of the supporting layer and the restricting layer are both smaller than the size of the hollow portion of the base.

6. The closed-loop stepper motor peristaltic pump according to claim 5, characterized in that: It also includes a pump body front cover, which is fixedly connected to the peristaltic pump body, and the peristaltic pump tube is sealed between the pump body front cover and the peristaltic pump body.

7. The closed-loop stepper motor peristaltic pump according to claim 6, characterized in that: One side of the front cover of the pump body is provided with a protrusion, which contacts the restriction layer and has a size larger than that of the peristaltic hose but not larger than that of the restriction layer, so that the peristaltic hose can be completely restricted in the protrusion.

8. The closed-loop stepper motor peristaltic pump according to claim 7, characterized in that: The limiting layer has a protrusion on one side of the center position, and the pump body front cover also has a depression at the center position. A limiting bearing is also arranged between the depression and the protrusion of the limiting layer. The size of the limiting bearing is smaller than the size of the pump body front cover and larger than the size of the limiting layer to limit the swing of the rotating part during rotation.

9. The closed-loop stepper motor peristaltic pump according to claim 8, characterized in that: It also includes an encoder and a processor. The encoder is connected to the stepper motor to encode the rotation step of the stepper motor; the processor is connected to the encoder to calculate the flow in the peristaltic pump tube according to the encoding value and the number of rotors to monitor the flow in the peristaltic pump tube in real time.

10. The closed-loop stepper motor peristaltic pump according to claim 8, characterized in that: It also includes an encoder and a processor, wherein the encoder is connected to the stepper motor to encode the rotation step of the stepper motor; the processor is connected to the encoder, and according to the relationship between the encoding value, the number of rotors and the flow rate in the peristaltic pump tube, the encoder is controlled by the processor to control the rotation speed of the stepper motor to achieve flow control in the peristaltic pump tube.

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