Peristaltic pump and method of assembling the same

Abstract

The application discloses a peristaltic pump and an assembling method thereof. The peristaltic pump comprises a pump head, an installation inner cavity is formed in the pump head, two installation holes communicating with the installation inner cavity are arranged on the pump head, and a positioning part is arranged on the installation inner cavity. A pump core assembly comprises a rotating core body and a plurality of extrusion rotors, the extrusion rotors are rotatably arranged on the rotating core body, and a pump pipe is arranged on the pump core assembly. An outer pipe wall of the pump pipe is provided with a positioning matching part. The rotating core body is rotatably arranged in the installation inner cavity, the positioning part is distributed around the outer side of the rotating core body, the pump pipe extends into the installation inner cavity and is arranged around the outer side of the rotating core body, the extrusion rotors abut against the pump pipe, the two end parts of the pump pipe extend out of the installation inner cavity through the corresponding installation holes, and the positioning matching part is connected with the positioning part. The pump pipe installation reliability is improved, and the flow control accuracy of the peristaltic pump is improved.

Description

Technical Field

[0001] This invention relates to the technical field of micro water pumps, and more particularly to a peristaltic pump. Background Technology

[0002] Peristaltic pumps are commonly used liquid transport devices, exhibiting good stability during liquid transport and widely applied in fields requiring accurate metering and low-flow-rate liquid transport. Based on the principle of peristaltic pump technology, fluid transport is achieved through the alternating peristaltic compression of an elastic pump tube. Therefore, the fluid transport state is related to the state of the pump tube. For example, the transport flow rate is related to the length of the pump tube between two compression units; even a slight change in the length of the pump tube between compression units will lead to a significant deviation in the final flow rate.

[0003] In existing peristaltic pumps, whether peristaltic or roller-type, the pump tubing is secured by the pump body at the inlet and outlet. However, this provides no fixation for the internal tubing. During operation, the internal extrusion rotors (rollers or extrusion rotors) directly press against the tubing. Due to friction, the rotors stretch the tubing along the rotation direction, causing it to deform and detach from the pump body's inner surface. Simultaneously, the tubing length (operating arc length) between the two extrusion rotors changes, leading to flow rate drift. The stress and deformation of the tubing can also cause displacement and runaway, further altering the extrusion state and resulting in flow rate fluctuations and errors.

[0004] Therefore, the technical problem to be solved by this invention is how to design a technology to improve the reliability of pump pipe installation in order to improve the flow control accuracy of peristaltic pumps. Summary of the Invention

[0005] This invention provides a peristaltic pump and its assembly method, which improves the reliability of pump pipe installation and thus enhances the flow control accuracy of the peristaltic pump.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides a peristaltic pump, comprising:

[0008] The pump head has an internal mounting cavity, and the pump head is also provided with two mounting holes that communicate with the mounting cavity. The mounting cavity is provided with a positioning part.

[0009] A pump core assembly, the pump core assembly including a rotating core and a plurality of extrusion rotors, the extrusion rotors being rotatably disposed on the rotating core;

[0010] The pump pipe has a positioning and fitting part provided on its outer pipe wall;

[0011] The rotating core is rotatably disposed in the mounting cavity, the positioning part is distributed around the outside of the rotating core, the pump tube extends into the mounting cavity and around the outside of the rotating core, the extrusion rotor abuts against the pump tube, the two ends of the pump tube extend to the outside of the mounting cavity through the corresponding mounting holes, and the positioning mating part is connected to the positioning part.

[0012] Furthermore, the positioning part is configured to restrict the displacement of the pump tube in the mounting cavity along a direction perpendicular to the extension of the pump tube by means of the positioning mating part.

[0013] Furthermore, the positioning part is also configured to restrict the pump tube from leaving the inner surface of the mounting cavity through the positioning mating part.

[0014] Furthermore, the positioning portion extends from one of the mounting holes to the other mounting hole within the mounting cavity.

[0015] Furthermore, the positioning part is a first positioning groove formed on the inner surface of the mounting cavity;

[0016] The positioning mating part is a first positioning rib formed on the outer wall of the pump pipe, and the first positioning rib is stuck in the first positioning groove.

[0017] Furthermore, the positioning part is a second positioning rib formed on the inner surface of the mounting cavity;

[0018] The positioning mating part is a second positioning groove formed on the outer wall of the pump pipe, and the second positioning rib is stuck in the second positioning groove.

[0019] Furthermore, the extrusion rotor is an extrusion roller, and the axis of the extrusion roller is arranged alternately with the pump pipe.

[0020] Furthermore, the extrusion rotor is an extrusion ball bearing.

[0021] Furthermore, the outer periphery of the rotating core is formed with an annular groove, and a plurality of mounting grooves are provided on the bottom surface of the annular groove. A plurality of rotatable balls are provided in the mounting grooves, and the extrusion balls are rotatably disposed in the annular grooves and abut against the balls in the corresponding mounting grooves.

[0022] Furthermore, a slot is provided on the wall of the annular groove, the slot is arranged on the outside of the corresponding mounting groove, and the extrusion ball is engaged in the slot.

[0023] Furthermore, a flexible buffer block is provided inside the mounting cavity, the flexible buffer block is located between the two mounting holes, and the flexible buffer block is configured to apply pressure to the extrusion ball.

[0024] Furthermore, the surface of the cavity wall of the mounting cavity that contacts the outer side of the pump tube is a support surface; along the flow direction of the liquid transported by the peristaltic pump, the support surface has a first straight segment, an arc segment, and a second straight segment, and the distance between the arc segment and the axis of the rotating core gradually increases.

[0025] The present invention also provides a method for assembling the above-mentioned peristaltic pump, comprising:

[0026] After assembling the pump core assembly into the mounting cavity of the pump head, insert one end of the pump tube into one of the mounting holes and connect the positioning mating part with the positioning part; drive the pump core assembly to rotate in the mounting cavity, and the extrusion rotor will extrude and push the end of the pump tube inserted into the mounting hole to move along the positioning part in the mounting cavity, so that the end of the pump tube is output from the other mounting hole; finally, fix both ends of the pump tube to the pump head.

[0027] The technical solution of the present invention has the following technical effects compared with the prior art: After the pump tube is assembled into the mounting cavity of the pump head, the positioning fitting part on the pump tube will be connected with the positioning part in the pump head. In this way, the pump tube can be tightly attached to the surface of the mounting cavity. During the rotation of the rotating core driving the extrusion rotor, the pump tube will be subjected to the extrusion force generated by the extrusion rotor and the drag force generated by the extrusion friction. However, the pump tube is restricted by the connection between the positioning fitting part and the positioning part, so that the pump tube will not be separated from the surface of the mounting cavity due to the force between the two extrusion rotors and thus will not be stretched and deformed. Furthermore, under the cooperation of the positioning fitting part and the positioning part, the position of the pump tube in the mounting cavity can remain unchanged, reducing the occurrence of abnormal states such as displacement and tube running due to the extrusion action of the extrusion rotor. This improves the reliability of pump tube installation and thus improves the flow control accuracy of the peristaltic pump. Attached Figure Description

[0028] Figure 1 This is one of the structural schematic diagrams of an embodiment of the peristaltic pump of the present invention;

[0029] Figure 2 This is a second schematic diagram of the structural principle of an embodiment of the peristaltic pump of the present invention;

[0030] Figure 3 for Figure 1 Cross-sectional view of the pump pipe;

[0031] Figure 4 This is the third structural schematic diagram of an embodiment of the peristaltic pump of the present invention;

[0032] Figure 5 This is the fourth structural schematic diagram of an embodiment of the peristaltic pump of the present invention;

[0033] Figure 6 for Figure 1 A cross-sectional view of the rotating core;

[0034] Figure 7 for Figure 1 Schematic diagram of the rotating core structure;

[0035] Figure 8 This is a schematic diagram of another embodiment of the peristaltic pump of the present invention;

[0036] Figure 9 for Figure 8 A schematic diagram of the pump head structure.

[0037] Figure label:

[0038] Pump head 1;

[0039] Mounting hole 11, positioning part 12;

[0040] Pump core assembly 2;

[0041] Rotating core 21, extrusion rotor 22, flexible buffer block 23;

[0042] Annular groove 211, mounting groove 212, ball 213, slot 214, notch 215;

[0043] Pump pipe 3;

[0044] Positioning and mating part 31;

[0045] Support surface 100, first straight segment 101, arc segment 102, second straight segment 103, inlet transition segment 104;

[0046] Extrusion section 1021, outlet transition section 1022. Detailed Implementation

[0047] The peristaltic pump provided in this application typically includes a pump head, a rotating core, a squeezing rotor, and a pump tube. The rotating core can rotate inside the pump head, and the squeezing rotor is mounted on the rotating core and can rotate with the rotating core to squeeze the pump tube passing through the pump head. The pump tube is continuously squeezed by the squeezing rotor, so that the liquid in the pump tube flows continuously, thereby achieving the function of pumping liquid.

[0048] Example 1, as Figures 1-3 As shown, this application provides a peristaltic pump, which includes:

[0049] Pump head 1, the interior of pump head 1 forms an installation cavity, and pump head 1 is also provided with two installation holes 11 that communicate with the installation cavity, and the installation cavity is provided with a positioning part 12;

[0050] Pump core assembly 2 includes a rotating core 21 and a plurality of extrusion rotors 22, the extrusion rotors 22 being rotatably mounted on the rotating core 21;

[0051] Pump pipe 3, the outer wall of the pump pipe is provided with a positioning and fitting part 31;

[0052] The rotating core 21 is rotatably disposed in the mounting cavity, the pump tube 3 extends into the mounting cavity and wraps around the outside of the rotating core 21, the extrusion rotor 22 abuts against the pump tube 3, and the two ends of the pump tube 3 extend to the outside of the mounting cavity through the corresponding mounting holes 11. The positioning mating part 31 is connected to the positioning part 12.

[0053] Specifically, to improve the performance of peristaltic pumps and ensure the stability, accuracy, and reliability of fluid flow, it is necessary to maintain the unchanged posture of the pump tubing during operation. Keeping the pump tubing in a constant position prevents stress and stretching that could cause changes in its working arc length, thereby fundamentally ensuring flow stability.

[0054] Therefore, for the pump tube 3 in the mounting cavity, an additional positioning and fitting part 31 is provided on its exterior, and correspondingly, a positioning part 12 is also provided in the mounting cavity. After the pump tube 3 is assembled into the mounting cavity, the positioning part 12 and the positioning and fitting part 31 will be connected together, so that the pump tube 3 can fit tightly against the inner surface of the mounting cavity. Furthermore, when the pump tube 3 is squeezed by the extrusion rotor 22, the positional change of the pump tube 3 in the mounting cavity can be reduced by the mutual cooperation of the positioning part 12 and the positioning and fitting part 31.

[0055] During the compression process of the pump tube 3 by the compression rotor 22, the part of the pump tube 3 located between the two compression rotors 22 can remain in contact with the inner wall of the mounting cavity under the pull of the positioning and fitting part 31, thereby reducing or avoiding deformation of the pump tube in the working arc length, and thus ensuring the stability, accuracy and reliability of the fluid flow rate transmitted by the peristaltic pump.

[0056] With regard to the positioning part 12 and the positioning mating part 31, the positioning part is further configured to restrict the pump tube from leaving the inner surface of the mounting cavity in the mounting cavity.

[0057] Specifically, since the positioning mating part 31 is connected to the positioning part 12 on the inner surface of the mounting cavity, the movement of the positioning mating part 31 is restricted by the positioning part 12, which can prevent the pump tube 3 from separating from the inner surface of the mounting cavity, and thus maintain the working arc length of the pump tube 3 unchanged under the action of the positioning part 12.

[0058] Meanwhile, the positioning part 12 is configured to restrict the displacement of the pump tube 3 in the mounting cavity along a direction perpendicular to the extension of the pump tube 3 by means of the positioning mating part 31.

[0059] Specifically, since the positioning and fitting part 31 extends along the length of the pump pipe 3, after the positioning and fitting part 31 is connected with the positioning part 12, the pump pipe 3 is squeezed by the extrusion rotor 22, and the pump pipe 3 will not be displaced or run away under the action of the positioning and fitting part 31.

[0060] To reduce wear on the pump pipe 3 and prevent deformation and incomplete compression caused by wear, a coating is applied to the inner cavity and positioning part 12. The coating is made of polytetrafluoroethylene, diamond, etc., which is corrosion-resistant, wear-resistant, and self-lubricating. It can effectively reduce the contact friction between the pump pipes 3 during pipe installation and operation.

[0061] After the pump tube is assembled into the mounting cavity of the pump head, the positioning fitting part on the pump tube will connect with the positioning part in the pump head. This allows the pump tube to fit tightly against the surface of the mounting cavity. During the rotation of the core and the extrusion rotor, the pump tube will be subjected to the extrusion force generated by the extrusion rotor and the drag force generated by the extrusion friction. However, the connection between the positioning fitting part and the positioning part restricts the pump tube from detaching from the surface of the mounting cavity and undergoing tensile deformation due to the force. Furthermore, under the cooperation of the positioning fitting part and the positioning part, the position of the pump tube in the mounting cavity can remain unchanged, reducing the occurrence of abnormal states such as displacement or tube slippage caused by the extrusion rotor. This improves the reliability of pump tube installation and thus improves the flow control accuracy of the peristaltic pump.

[0062] Furthermore, the positioning part 12 extends from one of the mounting holes 11 to the other mounting hole 11 within the mounting cavity.

[0063] Specifically, the positioning part 12 is located in the area between the two mounting holes 11, so that the pump pipe 3 located in the mounting cavity can be effectively positioned and supported.

[0064] In some embodiments, the physical manifestations of the positioning part 12 and the positioning mating part 31 can have various structural forms. For example, the positioning part is a first positioning groove formed on the inner surface of the mounting cavity; the positioning mating part is a first positioning rib formed on the outer wall of the pump pipe, the first positioning rib being engaged in the first positioning groove. Alternatively, the positioning part is a second positioning rib formed on the inner surface of the mounting cavity; the positioning mating part is a second positioning groove formed on the outer wall of the pump pipe, the second positioning rib being engaged in the second positioning groove.

[0065] In one embodiment, for the extrusion rotor, as Figure 1 and Figure 2 As shown, the extrusion rotor is an extrusion ball bearing. Or, as... Figure 4 and Figure 5 The extrusion rotor shown is an extrusion roller, and the axis of the extrusion roller is arranged alternately with the pump pipe.

[0066] The pump tube 3 is equipped with a positioning and mating part 31. During the assembly process, in addition to the conventional method of pre-assembling the pump tube 3 to the pump head 1, the following method can also be used: After assembling the pump core assembly 2 into the mounting cavity of the pump head 1, insert one end of the pump tube 3 into one of the mounting holes 11 and connect the positioning and mating part 31 with the positioning part 12; drive the pump core assembly 2 to rotate in the mounting cavity, and the extrusion rotor 22 will extrude and push the end of the pump tube 3 inserted into the mounting hole 11 to move along the positioning part 12 in the mounting cavity, so that the end of the pump tube 3 is output from the other mounting hole 11; finally, fix both ends of the pump tube 3 to the pump head.

[0067] The advantages of the above assembly method are that the assembly of the pump tube depends entirely on the rotation of the extrusion rotor. The assembly position, degree of extrusion, and the state of the pump tube under stress and tensile deformation are entirely dependent on the clearance fit between the extrusion rotor and the inner surface of the mounting cavity. This can effectively eliminate the differences caused by manual installation of the pump tube and effectively improve consistency and reliability.

[0068] After the pump tube is assembled into the mounting cavity by the extrusion rotor, the two ends of the pump tube can be fixed in the mounting holes of the pump head using conventional methods, such as pump tube joints or clamps.

[0069] In addition, when the pump tube is worn and needs to be replaced after a long period of use, the fixing function of the fixing component can be released and the extrusion rotor can be driven to reverse. The reverse action of the extrusion rotor is used to push the pump tube out of the mounting cavity and remove it for replacement with a new pump tube. In this way, it is not necessary to disassemble the entire pump head, thus simplifying the maintenance of the pump tube.

[0070] Example 2: In order to ensure that the extrusion rotor can be securely mounted on the rotating core and to ensure that the extrusion rotor will not be damaged due to prolonged single-point stress after long-term use, thus preventing it from rolling poorly.

[0071] like Figures 1-2 , Figures 6-7 As shown, the peristaltic pump provided in this embodiment uses extrusion balls as extrusion rotors. Two mounting holes 11 are also provided on the pump head 1 and arranged on the same side of the pump head 1. An annular groove 211 is formed on the outer periphery of the rotating core 21. Multiple mounting grooves 212 are provided on the bottom surface of the annular groove 211. Multiple rotatable balls 213 are provided in the mounting grooves 212. The extrusion rotor 22 is rotatably disposed in the annular groove 211 and abuts against the balls 213 in the corresponding mounting grooves 212.

[0072] Specifically, the extrusion rotor 22 is installed in the corresponding mounting groove 212 and supported by the ball bearings 213 provided in the mounting groove 212. At the same time, the extrusion rotor 22 is restricted by the groove walls of the annular groove 211 on both sides, so that the extrusion rotor 22 can rotate freely in the annular groove 211 without dislodging from the corresponding mounting groove 212.

[0073] When the extrusion rotor 22 extrudes the pump tube 3, it simultaneously receives a reaction force from the pump tube 3, causing it to apply pressure towards the mounting groove 212. This pressure is supported by rotatable ball bearings 213 within the mounting groove 212. These multiple ball bearings 213 provide multi-point support for the extrusion rotor 22. Furthermore, as the extrusion rotor 22 rotates, it acts on the ball bearings 213, causing them to rotate together. This prevents the extrusion rotor 22 from being subjected to prolonged stress at a single point, thus avoiding deformation and improving the reliability and stability of the peristaltic pump, thereby extending its service life.

[0074] Furthermore, a slot 214 is provided on the groove wall of the annular groove 211. The slot 214 is arranged on the outside of the corresponding mounting groove 212, and the extrusion rotor 22 is locked in the slot 214.

[0075] Specifically, by forming a recessed groove 214 on the groove wall of the annular groove 211, the groove 214 can restrict the extrusion rotor 22 from rolling freely in the annular groove 211. Furthermore, the groove 214 and the mounting groove 212 cooperate with each other to allow the extrusion rotor 22 to rotate smoothly on the outside of the mounting groove 212.

[0076] The annular groove 211 has two groove walls with oppositely arranged slots 214, and the extrusion rotor 22 is locked between the two oppositely arranged slots 214.

[0077] Furthermore, in order to reduce the amount of balls used and meet the requirements of quick and reliable assembly, the groove wall of the mounting groove 212 is provided with multiple notches 215, and the balls 213 are stuck in the corresponding notches 215 and can rotate in the notches 215.

[0078] Specifically, after the extrusion rotor 22 is assembled, the ball bearing 213 is limited by the notch 215, and the notch 215 is used to position the ball bearing 213, allowing the ball bearing 213 to rotate freely within the notch 215. Multiple evenly distributed notches 215 can be provided on the groove wall of the mounting groove 212.

[0079] In a preferred embodiment, a flexible buffer block 23 is further provided inside the mounting cavity. The flexible buffer block 23 is located between the two mounting holes 11 and is configured to apply pressure to the extrusion rotor 22.

[0080] Specifically, since the pump pipe 3 outputs from the two mounting holes 11 to the outside of the mounting cavity, and therefore the area between the two mounting holes 11 inside the mounting cavity is not equipped with the pump pipe 3, when the extrusion rotor 22 moves to the position where the pump pipe 3 is not installed, the extrusion rotor 22 at that position is not under pressure, which can cause uneven force on the rotating core 21.

[0081] By adding a flexible buffer block 23 to this part of the installation cavity, the flexible buffer block 23 itself can be deformed by the extrusion rotor 22, thereby acting as a pump pipe 3 to provide auxiliary support for the extrusion rotor 22 that has moved to this position. When the extrusion rotor 22 contacts the flexible buffer block 23, the contact force between the extrusion rotor 22 and the flexible buffer block 23 can force the extrusion rotor 22 to rotate, thereby releasing the extrusion pressure, preventing the extrusion rotor from accidentally jamming, and ensuring that the rotating core 21 is evenly stressed during rotation.

[0082] Furthermore, the flexible buffer block 23 has a porous structure and contains adsorbed grease.

[0083] Specifically, the flexible buffer block 23 can be made of materials such as latex, silicone, rubber, gel, and polymer fiber. It is both elastic and can absorb grease through its porous structure. The grease lubricates the surface of the extrusion rotor 22 and removes dust and other debris from the surface, thereby improving the reliability and stability of the pump.

[0084] By setting multiple mounting grooves that mate with the extrusion rotor on the bottom surface of the annular groove, and setting multiple rolling balls in the mounting grooves, the extrusion rotor is supported by the balls. When the extrusion rotor is compressed, the multiple balls can effectively support the extrusion rotor, thus preventing the extrusion rotor from deforming due to single-point support. This improves the reliability and stability of the peristaltic pump and extends its service life.

[0085] In Example 3, based on the above embodiments, optionally, during the operation of the peristaltic pump, the rotating core 21 drives multiple extrusion rotors 22 to rotate, thereby achieving liquid transfer through the alternating extrusion of the pump tube 3 by two adjacent extrusion rotors 22. However, during operation, the sudden change in the volume of the pump tube's inner cavity during the pressing and releasing of the extrusion rotors 22 can affect the liquid flow state, leading to pulsation during liquid transfer.

[0086] To solve the above problems, such as Figure 8 and Figure 9 As shown, the structural design and optimization of the shape of the support surface 100 of the mounting inner cavity support pump pipe 3 are carried out.

[0087] Specifically, the surface of the cavity wall of the mounting inner cavity in the pump head 1 that contacts the outer side of the pump pipe 3 is the support surface 100; along the flow direction of the liquid conveyed by the peristaltic pump of the extrusion rotor 22, the support surface 100 has a first straight segment 101, an arc segment 102 and a second straight segment 103, and the distance between the arc segment 102 and the axis of the rotating core 21 gradually increases.

[0088] Specifically, the first straight segment 101 and the second straight segment 103 are both arranged at the position of the mounting hole 11 connected to the mounting cavity. The first straight segment 101 is used to force the transition of the pump tube 3 from the inlet end to the subsequent functional section channel by utilizing the channel formed by the extension of the mounting cavity to the mounting hole 11. The second straight segment 103 is used to guide the pump tube 3 away from the rotating core 21 to the outlet end by utilizing the channel formed by the extension of the mounting cavity to the mounting hole 11. The arc segment 102 is used to cooperate with the rotating core 21 to squeeze the pump tube 3 with the squeezing rotor 22 to transport liquid.

[0089] Along the direction of liquid delivery within the pump pipe 3 in the mounting cavity, the axial distance between the arc segment 102 and the rotating core 21 gradually increases. Near the inlet end of the arc segment 102, the distance between the pump pipe 3 and the rotating core 21 is relatively short, allowing the two adjacent extrusion rotors 22 to effectively extrude pressure on this part of the pump pipe 3, ensuring efficient liquid delivery. As the liquid continues to flow forward in the pump pipe 3, the axial distance between the arc segment 102 and the rotating core 21 gradually increases, causing the pressure exerted by the extrusion rotors 22 on the pump pipe 3 to gradually decrease. This allows the pulses generated by the liquid flow to be gradually buffered at the rear of the arc segment 102, ideally eliminating the impact of pulsation.

[0090] In addition, the first straight segment 101 and the second straight segment 103 are both flat straight segments, which can effectively fix and restrict the pump tube 3, so as to reduce the changes in the state of the pump tube 3 such as running, displacement, and straightening when it is alternately squeezed by the extrusion rotor 22. This allows the pump tube 3 to always fit the curved surface of the arc segment 102 in the transition section, so that the extrusion state of the extrusion rotor 22 on the pump tube 3 meets the ideal gradual state, and thus achieves a pulse-free effect in practical applications.

[0091] Furthermore, an inlet transition section 104 is provided between the first straight segment 101 and the arc segment 102, and the inlet transition section 104 is a concave line segment.

[0092] Specifically, the inlet transition section 104 mainly satisfies that the pump pipe 3 can be arranged in a smooth trajectory from the first straight section 101 to the arc section 102. The pump pipe 3 introduced from the inlet end extends from a position away from the rotating core 21 to a position gradually approaching the rotating core 21 in this stage, and can be completely squeezed by the extrusion rotor that comes into contact at the end of the inlet transition section 104.

[0093] Furthermore, the arc segment 102 includes an extrusion segment 1021 and an outlet transition segment 1022 connected in sequence. Both the extrusion segment 1021 and the outlet transition segment 1022 are convex segments. The distance between the arc surface of the extrusion segment 1021 and the axis of the rotating core 21 is not greater than the distance between the arc surface of the outlet transition segment 1022 and the axis of the rotating core 21. The extrusion segment 1021 is connected to the inlet transition segment 104, and the outlet transition segment 1022 is connected to the second straight segment 103.

[0094] Specifically, for the arc segment 102, on the one hand, the arc segment 102 needs to restrict the tight contact and compression between the pump tube 3 and the ball 213 in the first half to ensure that the liquid can flow smoothly in the pump tube 3 to meet the requirements of the delivery flow rate. On the other hand, the arc segment 102 needs to reduce the restriction on the pump tube 3 in the second half to slow down the liquid flow rate and achieve buffering of flow rate fluctuations and reduce pulsation.

[0095] To meet the liquid delivery flow requirements, the first half of the arc segment 102 forms a compression section 1021. The axial distance between the compression section 1021 and the rotating core 21 remains constant to ensure that the compression rotor 22 exerts a stable compression force on the pump pipe 3 in the compression section 1021, ensuring the quantitative delivery of liquid. Specifically, the pump pipe 3 is completely compressed by the compression rotor 22 in the compression section 1021, and all the liquid contained in the pump pipe 3 between two adjacent compression rotors 22 is delivered to the outlet transition section 1022 to ensure precise flow control.

[0096] The outlet transition section 1022 primarily serves to reduce the impact of pulsation. Therefore, from the initial position to the final position, the distance between the arc surface of the outlet transition section 1022 and the axis of the rotating core gradually changes. This causes the pressure exerted on the pump pipe 3 by the extrusion rotor 22 within the outlet transition section 1022 to gradually decrease. Preferably, at the final position of the outlet transition section 1022, the pump pipe 3 is not subjected to pressure from the extrusion rotor 22.

[0097] Among them, the center of the arc surface of the extrusion section 1021 is located on the axis of the rotating core 21; along the flow direction of the liquid conveyed by the extrusion rotor 22 peristaltic pump, the radius of curvature of the arc surface of the inlet transition section 104 gradually increases.

[0098] In addition, in order to accurately control the flow rate, there are certain requirements for the length of the extrusion section 1021, namely, the central angle corresponding to the arc surface of the extrusion section 1021 is equal to or greater than the central angle formed between the centers of two adjacent extrusion rotors 22.

[0099] Specifically, the central angle corresponding to the arc surface of the extrusion section 1021 is not less than the central angle formed between the centers of two adjacent extrusion rotors 22. In this way, it can be ensured that the pump pipe 3 at the extrusion section 1021 is always pressed by the extrusion rotor 22, and the pump pipe 3 between two adjacent extrusion rotors 22 can accurately control the pumping flow rate.

[0100] In addition, in order to achieve stable liquid flow, the connection between the first straight segment 101 and the inlet transition segment 104 is arranged tangentially, the connection between the inlet transition segment 104 and the arc segment 102 is arranged tangentially, and the connection between the second straight segment 103 and the arc segment 102 is arranged tangentially.

[0101] In addition, by dividing the support surface formed by the cavity wall of the mounting cavity into a first straight segment, an arc segment, and a second straight segment, the two straight segments can ensure that the pump tube is installed straight on the pump head and extends out from the mounting hole. The distance between the arc segment and the rotating core gradually increases. The pump tube closer to the liquid inlet can be effectively squeezed by the squeezing rotor to meet the liquid delivery needs of the squeezing pump tube. As the liquid flows in the pump tube, the distance between the arc segment and the rotating core gradually increases, thereby reducing the pulsation phenomenon caused by the intermittent squeezing of the pump tube by the squeezing rotor. This reduces the backflow, pause, or fluctuation of the liquid flow in the pump tube caused by squeezing pulsation, thereby improving the stability and accuracy of liquid delivery.

[0102] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A peristaltic pump, characterized in that, include: The pump head has an internal mounting cavity, and the pump head is also provided with two mounting holes that communicate with the mounting cavity. The mounting cavity is provided with a positioning part. A pump core assembly, the pump core assembly including a rotating core and a plurality of extrusion rotors, the extrusion rotors being rotatably disposed on the rotating core; The pump pipe has a positioning and fitting part provided on its outer pipe wall; The rotating core is rotatably disposed in the mounting cavity, the positioning part is distributed around the outside of the rotating core, the pump tube extends into the mounting cavity and around the outside of the rotating core, the extrusion rotor abuts against the pump tube, the two ends of the pump tube extend to the outside of the mounting cavity through the corresponding mounting holes, and the positioning mating part is connected to the positioning part. The positioning part extends from one of the mounting holes to the other mounting hole within the mounting cavity, and the positioning part is configured to limit the displacement of the pump tube within the mounting cavity in a direction perpendicular to the extension of the pump tube by means of the positioning mating part; The positioning part is a second positioning rib formed on the inner surface of the mounting cavity; The positioning mating part is a second positioning groove formed on the outer wall of the pump pipe, and the second positioning rib is stuck in the second positioning groove.

2. The peristaltic pump according to claim 1, characterized in that, The extrusion rotor is an extrusion roller, and the axis of the extrusion roller is arranged alternately with the pump pipe.

3. The peristaltic pump according to claim 1, characterized in that, The extrusion rotor is an extrusion ball bearing.

4. The peristaltic pump according to claim 3, characterized in that, The outer periphery of the rotating core is formed with an annular groove, and multiple mounting grooves are provided on the bottom surface of the annular groove. Multiple rolling balls are provided in the mounting grooves, and the extrusion ball is rotatably disposed in the annular groove and abuts against the ball in the corresponding mounting groove.

5. The peristaltic pump according to claim 4, characterized in that, The annular groove has a slot on its wall, which is located on the outside of the corresponding mounting groove, and the extrusion ball is engaged in the slot.

6. The peristaltic pump according to claim 4, characterized in that, The two mounting holes are arranged on the same side of the pump head, and a flexible buffer block is also provided inside the mounting cavity. The flexible buffer block is located between the two mounting holes and is configured to apply pressure to the extrusion ball.

7. The peristaltic pump according to claim 4, characterized in that, The surface of the cavity wall of the mounting cavity that contacts the outer side of the pump tube is a support surface; along the flow direction of the liquid transported by the peristaltic pump, the support surface has a first straight segment, an arc segment, and a second straight segment, and the distance between the arc segment and the axis of the rotating core gradually increases.

8. A method for assembling a peristaltic pump as described in any one of claims 1-7, characterized in that, include: After assembling the pump core assembly into the mounting cavity of the pump head, insert one end of the pump tube into one of the mounting holes and connect the positioning mating part with the positioning part. The pump core assembly is driven to rotate in the mounting cavity. The extrusion rotor extrudes and pushes the end of the pump tube inserted into the mounting hole to move along the positioning part in the mounting cavity, eventually causing the end of the pump tube to exit from another mounting hole. Finally, both ends of the pump tube are fixed to the pump head.

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