A closed loop stepper motor peristaltic pump

Abstract

The application relates to a closed-loop stepping motor peristaltic pump, which comprises a stepping motor, a peristaltic pump body and a peristaltic pump pipe, the peristaltic pump body is fixedly connected with the stepping motor and is driven to rotate around a rotation axis by the stepping motor, the peristaltic pump pipe is in contact with the peristaltic pump body, 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, rotates around the rotation axis following the rotation of the stepping motor, and is provided with a plurality of through holes, the rotors are arranged between the through holes of the rotating part, one end of each rotor is in pressure contact with the peristaltic pump pipe, and the rotors rotate around the rotation axis following the rotation of the rotating part and self-rotate. The closed-loop stepping motor peristaltic pump has smaller abrasion, and can replace the parts after abrasion, so that the service life is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coding machinery, in particular to a closed-loop stepping motor peristaltic pump. BACKGROUND

[0002] In the absence of self-powered, transport fluid usually need to use a pump as a power source, pump has a variety of forms and categories, which, not in direct contact with the fluid peristaltic pump can completely avoid the contact pollution of the pump to the fluid and the erosion of the fluid to the pump, and has easy to replace the peristaltic pump tube, so in recent years has made great progress.

[0003] Referring to the patent with publication number "CN205025736U", the existing peristaltic pump includes a motor drive board, a stepping motor, a peristaltic pump body, a peristaltic pump tube and a pump body front cover, the motor drive board is connected with the stepping motor, receives external control signal and drives the stepping motor to produce rotation according to the control signal; the peristaltic pump body is fixedly connected with the stepping motor and is driven to rotate by the stepping motor; the peristaltic pump tube is in contact with the peristaltic pump body, and the fluid in the peristaltic pump tube can be driven to flow when the peristaltic pump body rotates; the pump body front cover is fixedly connected with 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 the rotating part is connected with the shaft center of the roller, so that the roller can rotate around the shaft center, and the two rollers are symmetrically arranged with the rotating shaft of the rotating part as the symmetry axis; the rotating part is connected with the stepping motor, and when the stepping motor rotates, the rotating part rotates synchronously, the two rollers also rotate synchronously around the shaft center of the rotating part with the rotating part, and the peristaltic pump tube is extruded to make the fluid in the peristaltic pump tube move.

[0004] However, the service life of the existing peristaltic pump is short, which leads to the fact that the advantage of replaceable peristaltic pump tube to prolong the overall service life is not prominent. SUMMARY

[0005] Based on this, the purpose of the present application is to provide a closed-loop stepping motor peristaltic pump, which can reduce its own wear and tear, and can replace its own parts after wear and tear, greatly prolonging the service life and saving costs.

[0006] The closed loop stepping motor peristaltic pump comprises a stepping motor, a peristaltic pump body and a peristaltic pump pipe, the peristaltic pump body is fixedly connected with the stepping motor and rotates around the rotation axis driven by the stepping motor, the peristaltic pump pipe is in contact with the peristaltic pump body, and the 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 the rotation axis following the rotation of the stepping motor, a plurality of through holes are arranged on the rotating part, the rotors are arranged between the through holes of the rotating part, one end of the rotors is in pressure contact with the peristaltic pump pipe, and the rotors rotate around the rotation axis and self-rotate following the rotating part.

[0007] Compared with the peristaltic pump in the prior art, in the closed loop stepping motor peristaltic pump, the rotors not only revolve around the rotation axis following the rotation of the stepping motor, but also self-rotate around the central axis of the rotors, so that the contact position between the rotors and the peristaltic pump pipe is changed, the contact surface is uniformly worn, and the service life is increased, and the rotors which are not fixedly connected with the rotating part can be replaced after being worn, so that the service life of the closed loop stepping motor peristaltic pump is further prolonged.

[0008] Further, the rotating part comprises a support layer, a connecting shaft and a limiting layer, the connecting shaft is arranged between the support layer and the limiting layer and fixedly connects the support layer and the limiting layer, the central position of the support layer is located on the rotation axis, the support layer has a hollow at the central position so that the motor rotating shaft passes through the support layer, the connecting shaft has a hollow portion in the inside so that the motor rotating shaft passes into the inside of the connecting shaft, the connecting shaft is provided with a through hole, and the rotating part and the motor rotating shaft of the stepping motor are fixed together through a screw passing through the through hole and a screw hole arranged on the motor rotating shaft, so that the rotating part rotates following the rotation of the motor rotating shaft.

[0009] Further, the support layer and the limiting layer are each provided with a plurality of through holes, the rotor comprises a clamping end, a column body and a friction end, the column body connects the clamping end and the friction end, the clamping end passes through the through hole on the support 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 freely rotate around the central axis of the column body.

[0010] Further, the maximum cross-sectional area of the clamping end of the rotor is greater than the area of the through hole on the support layer, and the maximum cross-sectional area of the friction end of the rotor is greater than the area of the through hole on the limiting layer, so that the rotor is limited in the rotating part.

[0011] Further, the peristaltic pump body further comprises a base, the inside of the base has a hollow portion, the rotating part is arranged between the hollow portions of the base, and the sizes of the support layer and the limiting layer are smaller than the size of the hollow portion of the base.

[0012] Further, the pump body front cover is fixedly connected with the peristaltic pump body, and the peristaltic pump pipe is sealed between the pump body front cover and the peristaltic pump body.

[0013] Further, the pump body front cover has a protrusion on one side, which is in contact with the limiting layer, and the size of the protrusion is greater than the size of the peristaltic hose and is not greater than the size of the limiting layer, so as to completely limit the peristaltic hose in the protrusion.

[0014] Further, the limiting layer has a protrusion on one side of the center position, and the pump body front cover also has a recess at the center position, and a limiting bearing is further arranged between the recess and the protrusion of the limiting layer, and the size of the limiting bearing is smaller than the size of the pump body front cover and is greater than the size of the limiting layer, so as to limit the swing of the rotating part during rotation.

[0015] Further, the encoder is connected with the stepping motor, and the rotation step of the stepping motor is encoded; the processor is connected with the encoder, and the flow in the peristaltic pump pipe is calculated according to the encoding value and the number of rotors, so as to monitor the flow in the peristaltic pump pipe in real time.

[0016] Further, the encoder is connected with the stepping motor, and the rotation step of the stepping motor is encoded; the processor is connected with the encoder, and the flow in the peristaltic pump pipe is calculated according to the encoding value and the number of rotors, so as to monitor the flow in the peristaltic pump pipe in real time.

[0017] In order to better understand and implement, the application will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a structure schematic diagram of the closed-loop stepping motor peristaltic pump of the application.

[0019] Figure 2 The figure is a base structure schematic diagram of the closed-loop stepping motor peristaltic pump of the application.

[0020] Figure 3 The figure is a rotating part structure schematic diagram of the closed-loop stepping motor peristaltic pump of the application.

[0021] Figure 4 The figure is a rotor seat structure schematic diagram of the closed-loop stepping motor peristaltic pump of the application.

[0022] Figure 5 The figure is a rotor structure schematic diagram of the closed-loop stepping motor peristaltic pump of the application.

[0023] Figure 6 The figure is a peristaltic pump pipe structure schematic diagram of the closed-loop stepping motor peristaltic pump of the application.

[0024] Figure 7 Figure 1 is a schematic view of the front cover structure of the pump body of the closed-loop stepping motor peristaltic pump of the present application. DETAILED DESCRIPTION

[0025] The applicant carefully analyzed the prior art peristaltic pump and found that the reason for its short service life is that the roller is in long-term friction with the peristaltic pump tube. Although the peristaltic pump tube can be replaced after wear, the roller cannot be replaced and its wear weakens the driving effect on the fluid and strengthens the damage to the peristaltic pump tube, resulting in the peristaltic pump being unable to continue to be used. Therefore, the applicant attempts to set the rotor shaft and the rotor, which replaces the roller and is in contact with the peristaltic pump tube, but the rotor is not fixed directly on the rotating part but is fixed on the rotating part through the rotor shaft, thereby realizing 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. Therefore, the applicant attempts 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 wear degree of the rotor caused by the friction between the rotor and the peristaltic pump tube.

[0026] Referring to Figure 1 The closed-loop stepping motor peristaltic pump of the present application comprises a stepping motor 10, a peristaltic pump body 20, a peristaltic pump tube 30, a pump body front cover 40, an encoder (not shown in the figure) and a processor (not shown in the figure). The peristaltic pump body 20 is fixedly connected with the stepping motor 10 and is driven to rotate by the stepping motor 10; the peristaltic pump tube 30 is in contact with the peristaltic pump body 20, and the fluid inside the peristaltic pump tube 30 can be driven to flow when the peristaltic pump body 20 rotates; the pump body front cover 40 is fixedly connected with 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 stepping motor 10 comprises a motor body 11 and a motor rotating shaft 12. The motor rotating shaft 12 is connected with the motor body 11 and rotates along the rotating axis located at the center of the stepping motor 10 according to the control signal transmitted by the motor body 11. Meanwhile, the motor body 11 also provides power for the motor rotating shaft 12. The motor rotating shaft 12 is provided with a screw hole.

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

[0029] Referring to Figure 2, the center of the base 21 is located on the rotation axis, and the base 21 has an arc-shaped hollow portion inside, and the center of the arc-shaped hollow portion is located on the rotation axis; the shell portion of the base 21 is fixedly connected with the motor body 11 of the stepping motor 10 through screws, and the motor rotating shaft 12 of the stepping motor 10 penetrates into the base 21 at the center of the arc-shaped hollow portion of the base 21.

[0030] Please refer to Figure 3 , the rotating part 22 is arranged between the hollow portions of the base 21 and is protected by the shell portion of the base 21. The rotating part 22 comprises a support layer 221, a limiting layer 222 and a connecting shaft 223, and presents an I-shaped cross section on the side surface. The connecting shaft 223 is arranged between the support layer 221 and the limiting layer 222, and the support layer 221 and the limiting layer 222 are fixedly connected through the connecting shaft 223. The support layer 221 is a disc, the center of which is located on the rotation axis, and has a hollow portion of a certain size at the center position, which allows the motor rotating shaft 12 to penetrate through the support layer 221. The limiting layer 222 is a flat plate, and has a circular protrusion at the center position on one side. The connecting shaft 223 is a cylinder, and has a cylindrical hollow portion inside, and the center axis of the hollow portion is collinear with the rotation axis. The radius of the support layer 221 is smaller than the radius of the arc-shaped hollow portion of the base 21, and the maximum distance from the center position of the limiting layer 222 is smaller than the radius of the arc-shaped hollow portion of the base 21. The connecting shaft 223 is provided with a through hole, and the rotating part 22 and the motor rotating shaft 12 of the stepping motor 10 are fixed together through the through hole and the screw hole on the motor rotating shaft 12 through screws, so that the rotating part 22 can rotate with the rotation of the motor rotating shaft 12. In particular, a rotating bearing 51 is further arranged on the side of the support layer 221 close to the stepping motor 10, the rotating bearing 51 is sleeved on the motor rotating shaft 12, and is annular, with the center located on the rotation axis, for preventing the support layer 221 from directly contacting the motor body 11 of the stepping motor 10, thereby causing great abrasion. Lubricating oil is coated inside the rotating bearing 51 to reduce the abrasion of the rotating bearing 51 to the motor rotating shaft 12. A gasket 60 is further arranged between the rotating bearing 51 and the support layer 221, and lubricating oil is applied on both sides of the gasket 60 to reduce the abrasion of the rotating bearing 51 to the support layer 221.

[0031] Please refer to Figure 4 The rotor seat 23 is a cylinder, and has a cylindrical hollow portion inside, and the center axis of the hollow portion is collinear with the rotation axis. The number of the rotor seat 23 is four, and the rotor seats 23 are symmetrically arranged between the support layer 221 and the limiting layer 222 of the rotating part 22 with the rotation axis as the axis of symmetry, for limiting the position of the rotor 24.

[0032] Please refer to Figure 5The rotor 24 is a cylinder, and the number of the rotor 24 corresponds to the number of the rotor seat 23. The rotor 24 includes a clamping end 241, a friction end 242 and a cylinder 243. The clamping end 241 is located near the stepping motor 10, and passes through the through hole in the support layer 221 of the rotating part 22. The friction end 242 is located near the front cover 40 of the pump body, and passes through the through hole in the limiting layer 222 of the rotating part 22. The cylinder 243 connects the clamping end 241 and the friction end 242, and the cylinder 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 area of the through hole in the support layer 221, and the cross-sectional area of the friction end 242 of the rotor 24 is larger than the area of the through hole in the limiting layer 222, so that the rotor 24 is limited in the rotor seat 23 and cannot be separated from the rotor seat 23 during rotation, and at the same time, the rotor 24 can rotate freely around the central axis of the cylinder 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 steps or cylinders, as long as the rotor 24 does not separate from the rotor seat 23. The clamping end 241 of the rotor 24 and the support layer 221 are further provided with a clamping spring 70 to prevent the rotor 24 from separating from the rotor seat 23 and causing operation failure. The bottom surface of the friction end 242 of the rotor 24 is in contact with the peristaltic pump tube 30, and rubs against the peristaltic pump tube 30 during work.

[0033] It can be understood that the motor shaft 12 rotates around the rotation axis where the center of the motor shaft 12 is located, the rotating part 22 rotates around the rotation axis where the center of the motor shaft 12 is located, the rotor seat 23 makes a circular motion around the rotation axis with the rotating part 22, and the rotor 24 makes a circular motion around the rotation axis with the rotor seat 23. The rotation of the motor shaft 12 and the rotating part 22 is rotation, and the rotation of the rotor seat 23 and the rotor 24 is 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 also rotates around the central axis of the rotor 24 as the rotor 24 is affected by the friction force between the friction end 242 of the rotor 24 and the peristaltic pump tube 30.

[0034] It can be understood that when the rotor 24 only revolves and 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 force between the bottom surface of the friction end 242 of the rotor 24 and the peristaltic pump tube 30 is not uniform during the work of the stepping motor 10. Long-term work will cause the edge or center of the bottom surface of the friction end 242 of the rotor 24 to be severely worn, although other positions are still good, the rotor 24 also needs to be replaced to work normally. When the rotor 24 can revolve and rotate at the same time, the friction between the bottom surface of the friction end 242 of the rotor 24 and the peristaltic pump tube 30 is more uniform, so that the service life of the rotor 24 is prolonged.

[0035] Please refer to Figure 6 , the peristaltic pump tube 30 includes a peristaltic hose 31 and two connecting heads 32, the peristaltic hose 31 is arranged in an arch shape on the limiting layer 222, in contact with the bottom surface of the friction end 242 of the rotor 24, for transporting fluid, the maximum distance of the edge of the peristaltic hose 31 from the rotation axis is less than the maximum distance of the limiting layer 222 from the center position; two connecting heads 32 are respectively connected to the two end openings of the peristaltic hose 31 for communication with external pipelines, so that the closed-loop stepping motor 10 peristaltic pump of the application can be applied to various fluid transportation environments.

[0036] Please refer to Figure 7 , the pump body front cover 40 is a flat plate, one side of which has a circular protrusion, the height of the circular protrusion is greater than the thickness of the peristaltic hose 31, so as to be in contact with the limiting 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, the radius of the circular protrusion is greater than the maximum distance of the edge of the peristaltic hose 31 from the rotation axis, and is not greater than the maximum distance of the limiting layer 222 from the center position, so as to completely contain the peristaltic hose 31 in the circular protrusion, forming a relatively closed space, reducing the evaporation of lubricating oil, and prolonging 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 limited in the space between the pump body front cover 40 and the limiting layer 222. The pump body front cover 40 also has a circular recess at the center position, and a limiting bearing 52 is further arranged between the circular recess and the circular protrusion of the limiting layer 222, the limiting bearing 52 is in the shape of a ring, the radius of the limiting bearing 52 is less than the radius of the circular recess of the pump body front cover 40, and greater than the radius of the circular protrusion of the limiting layer 222, preventing the rotating part 22 from swinging when rotating.

[0037] The encoder is connected to the stepping motor 10, and can encode the rotation step of the stepping motor 10, so as to realize the conversion of analog signals and digital signals, and facilitate actual data processing.

[0038] The processor is connected to the encoder, and accurately calculates the flow in the peristaltic pump tube 30 according to the encoding value and the number of rotors, so that the flow in the peristaltic pump tube 30 can be clearly monitored in real time. Similarly, according to the reverse use of the relationship between the encoding value, the number of rotors and the flow in the peristaltic pump tube 30, the processor can control the encoder, so as to control the rotation speed of the stepping motor 10, and realize accurate control of the flow in the peristaltic pump tube 30. It can be understood that the more the number of rotors is, the more accurate the calculation of the flow in the peristaltic pump tube 30 can be.

[0039] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, and the present application also intends to include these modifications and improvements.

Claims

1. A closed loop stepper motor peristaltic pump characterized by: The application relates to a peristaltic pump, which comprises the following parts: a stepping motor, a peristaltic pump body and a peristaltic pump pipe, the peristaltic pump body is fixedly connected with the stepping motor and rotates around a rotating axis driven by the stepping motor, the peristaltic pump pipe is in contact with the peristaltic pump body, and the fluid in the peristaltic pump pipe flows 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 the rotating axis following the rotation of the stepping motor, a plurality of through holes are arranged on the rotating part, the rotors are arranged between the through holes of the rotating part, one end of the rotors is in pressure contact with the peristaltic pump pipe, and the rotors rotate around the rotating axis and self-rotate following the rotating part, wherein the bottom surface of the friction end of the rotor is in contact with the peristaltic pump pipe. The peristaltic pump further comprises a pump body front cover, the pump body front cover is fixedly connected with the peristaltic pump body, and the peristaltic pump pipe is sealed between the pump body front cover and the peristaltic pump body. The rotating part comprises 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, the center position is hollow to a certain size so that the motor rotating shaft can pass through the supporting layer, the connecting shaft has a hollow part in the inside so that the motor rotating shaft can pass into the inside of the connecting shaft, a through hole is arranged on the connecting shaft, the rotating part and the motor rotating shaft of the stepping motor are fixed together through a screw passing through the through hole and a screw hole arranged on the motor rotating shaft so that the rotating part rotates following the rotation of the motor rotating shaft. The supporting layer and the limiting layer are both provided with a plurality of through holes, the rotor comprises a clamping end, a column body and a friction end, the column body 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 freely rotate around the central axis of the column body. The maximum cross-sectional area of the clamping end of the rotor is greater than the area of the through hole on the supporting layer, and the maximum cross-sectional area of the friction end of the rotor is greater than the area of the through hole on the limiting layer so that the rotor is limited in the rotating part. One side of the pump body front cover is provided with a protrusion, the protrusion is in contact with the limiting layer, the size of the protrusion is greater than the size of the peristaltic soft pipe and is not greater than the size of the limiting layer so that the peristaltic soft pipe is completely limited in the protrusion. The peristaltic pump body further comprises a base, the inside of the base has a hollow part, the rotating part is arranged between the hollow parts of the base, and the sizes of the supporting layer and the limiting layer are all smaller than the size of the hollow part of the base.

2. A closed loop stepper motor peristaltic pump according to claim 1 wherein: One side of the center position of the limiting layer is provided with a protrusion, the pump body front cover is further provided with a recess at the center position, a limiting bearing is further arranged between the protrusion of the limiting layer and the recess, the size of the limiting bearing is smaller than the size of the pump body front cover and is greater than the size of the limiting layer so that the rotating part is limited from swinging when rotating.

3. The closed loop stepper motor peristaltic pump of claim 2, wherein: The peristaltic pump further comprises an encoder and a processor, the encoder is connected with the stepping motor and encodes the rotation step length of the stepping motor, the processor is connected with the encoder, the flow in the peristaltic pump pipe is calculated according to the encoding value and the number of rotors, and the flow in the peristaltic pump pipe is monitored in real time.

4. The closed loop stepper motor peristaltic pump of claim 3, wherein: ​ 5. The closed loop stepper motor peristaltic pump of claim 4, wherein: The application also comprises an encoder and a processor, the encoder is connected with the step motor to encode the rotation step of the step motor; the processor is connected with the encoder, and the flow in the peristaltic pump tube is controlled by the processor according to the relationship between the encoder value, the number of rotors and the flow in the peristaltic pump tube, so as to control the rotation speed of the step motor to realize the flow control in the peristaltic pump tube.

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