Peristaltic pump

Abstract

The utility model discloses a peristaltic pump which comprises a pump head, an inner installation cavity is formed in the pump head, and two installation holes communicated with the inner installation cavity are further formed in the pump head. The pump core assembly comprises a rotating core body and a plurality of extrusion rotors, an annular groove is formed in the outer circumference of the rotating core body, a plurality of mounting grooves are formed in the groove bottom face of the annular groove, and a plurality of rolling balls are arranged in the mounting grooves. The extrusion rotors are rotatably arranged in the annular grooves and abut against the balls in the corresponding installation grooves. A pump pipe; wherein the rotating core body is rotatably arranged in the mounting inner cavity, the pump pipe extends into the mounting inner cavity and surrounds the outer portion of the rotating core body, the extrusion rotor abuts against the pump pipe, and the two ends of the pump pipe extend out of the mounting inner cavity through the corresponding mounting holes. The use reliability and stability of the peristaltic pump are improved, so that the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of micro water pumps, in particular to a peristaltic pump. Background Art

[0002] Peristaltic pump is a commonly used liquid delivery device, which has good stability during the liquid delivery process and is widely used in the field of liquid delivery that requires accurate quantitative and micro-flow rate. Peristaltic pump realizes liquid transmission by alternating squeezing of the pump tube by two adjacent extrusion units. When the extrusion rotor compresses or relaxes the pump tube, the sudden change in the volume of the inner cavity of the pump tube will affect the liquid flow state. This effect will cause pulsation during liquid transmission, causing the liquid flow in the pipeline to be sucked back, paused, or fluctuated, affecting the stability and accuracy of liquid transmission. In order to solve the pulsation problem, the prior art usually reduces the pulsation by increasing the number of extrusion rotors. This technology essentially only increases the frequency of pulsation, thereby weakening the influence of a single pulse on the fluid flow in a fixed period, and does not fundamentally solve the pulsation problem. In view of this, how to design a technology to reduce the pulsation effect of the peristaltic pump to improve the reliability of the peristaltic pump is a technical problem to be solved by the utility model. Utility Model Content

[0003] The utility model provides a peristaltic pump, which can reduce the pulsation influence of the peristaltic pump and improve the use reliability of the peristaltic pump.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a peristaltic pump, comprising:

[0006] A pump head, wherein a mounting inner cavity is formed inside the pump head, and the pump head is further provided with two mounting holes communicating with the mounting inner cavity, and the two mounting holes are arranged on the same side of the pump head;

[0007] A pump core assembly, the pump core assembly comprising a rotating core and a plurality of extruded rotors,

[0008] Pump tube;

[0009] The rotating core is rotatably arranged in the installation inner cavity, the pump tube extends into the installation inner cavity and surrounds the outside of the rotating core, the extrusion rotor abuts against the pump tube, and the two ends of the pump tube extend to the outside of the installation inner cavity through the corresponding installation holes;

[0010] In addition, the surface where the cavity wall of the installation cavity 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 line segment, an arc segment and a second straight line segment, and the distance between the arc segment and the axis of the rotating core gradually increases.

[0011] Furthermore, an inlet transition section is provided between the first straight line section and the arc section, and the inlet transition section is an inwardly concave line section.

[0012] Furthermore, the arc segment includes an extrusion segment and an outlet transition segment connected in sequence, the extrusion segment and the outlet transition segment are both convex segments, and the distance between the arc surface of the extrusion segment and the axis of the rotating core is not greater than the distance between the arc surface of the outlet transition segment and the axis of the rotating core;

[0013] Wherein, the extrusion section is connected to the inlet transition section, and the outlet transition section is connected to the second straight line section.

[0014] Furthermore, the center of the circular arc surface of the extrusion section is located on the axis of the rotating core; along the flow direction of the liquid transported by the peristaltic pump, the curvature radius of the circular arc surface of the inlet transition section gradually increases.

[0015] Furthermore, the central angle corresponding to the arc surface of the extrusion segment is equal to or greater than the central angle formed between the centers of two adjacent extrusion rotors.

[0016] Furthermore, an annular groove is formed on the outer circumference of the rotating core, a plurality of mounting grooves are arranged on the bottom surface of the annular groove, a plurality of rollable balls are arranged in the mounting groove, and the extrusion rotor is rotatably arranged in the annular groove and abuts against the balls in the corresponding mounting grooves.

[0017] Furthermore, a clamping groove is provided on the groove wall of the annular groove, the clamping groove is arranged on the outer side of the corresponding mounting groove, and the extrusion rotor is clamped in the clamping groove.

[0018] Furthermore, the two groove walls of the annular groove are respectively provided with the clamping grooves arranged opposite to each other, and the extrusion rotor is clamped between the two clamping grooves arranged opposite to each other.

[0019] Furthermore, a flexible buffer block is also provided inside the installation cavity, and the flexible buffer block is located between the two installation holes, and the flexible buffer block is configured to apply pressure to the extrusion rotor.

[0020] Furthermore, the flexible buffer block is a porous structure, and grease is adsorbed in the flexible buffer block.

[0021] The technical solution of the utility model has the following technical effects compared with the prior art: by dividing the supporting surface formed by the cavity wall of the installation cavity into a first straight segment, an arc segment and a second straight segment, the two straight segments can satisfy the pump tube to be installed straight on the pump head and extend from the installation hole for output, and the distance between the arc segment and the rotating core is gradually increased, the pump tube close to the liquid inlet side can obtain effective extrusion from the extrusion rotor to satisfy the extrusion pump tube to transport the liquid, and as the liquid flows forward in the pump tube, the distance between the arc segment and the rotating core gradually increases, thereby slowing down the pulsation phenomenon caused by the intermittent extrusion of the pump tube by the extrusion rotor, reducing the back suction, pause, or fluctuation of the liquid flow in the pump tube caused by the extrusion pulsation, so as to improve the stability and accuracy of liquid delivery.

[0022] In addition, a plurality of mounting grooves cooperating with the extrusion rotor are arranged on the bottom surface of the annular groove, and a plurality of rollable balls are arranged in the mounting grooves. The balls are utilized to support and install the extrusion rotor, so that when the extrusion rotor is extruded, the plurality of balls can effectively support the extrusion rotor to solve the problem of extrusion deformation of the extrusion rotor due to single-point support, thereby improving the reliability and stability of the peristaltic pump and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is one of the structural principle diagrams of the first embodiment of the peristaltic pump of the utility model;

[0024] Figure 2 This is the second structural principle diagram of the first embodiment of the peristaltic pump of the utility model;

[0025] Figure 3 for Figure 1 A cross-sectional view of the rotating core;

[0026] Figure 4 for Figure 1 A schematic diagram of the structure of the rotating core;

[0027] Figure 5 This is a structural principle diagram of the second embodiment of the peristaltic pump of the utility model;

[0028] Figure 6 for Figure 5 Schematic diagram of the structure of the pump head.

[0029] Reference numerals:

[0030] Pump head 1;

[0031] Mounting hole 11;

[0032] Pump core assembly 2;

[0033] Rotating core 21, extruding rotor 22, flexible buffer block 23;

[0034] Annular groove 211, mounting groove 212, ball 213, clamping groove 214, notch 215;

[0035] Pump tube 3;

[0036] A first straight line segment 101, an arc segment 102, a second straight line segment 103, and an inlet transition segment 104;

[0037] Extrusion section 1021 and outlet transition section 1022 . DETAILED DESCRIPTION

[0038] The peristaltic pump provided in the present application generally includes a pump head, a rotating core, an extrusion rotor and a pump tube. The rotating core can rotate inside the pump head. The extrusion rotor is arranged 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 constantly squeezed by the extrusion rotor so that the liquid in the pump tube keeps flowing, thereby achieving the effect of pumping the liquid.

[0039] Embodiment 1, as Figure 5 and Figure 6 As shown, the peristaltic pump provided in this embodiment includes:

[0040] A pump head 1, wherein an installation inner cavity is formed inside the pump head 1, and the pump head 1 is also provided with two installation holes 11 communicating with the installation inner cavity;

[0041] The pump core assembly 2 includes a rotating core 21 and a plurality of extruded rotors 22.

[0042] Pump tube 3;

[0043] Among them, the rotating core 21 is rotatably arranged in the installation inner cavity, the pump tube 3 extends into the installation inner cavity and surrounds the outside of the rotating core 21, the extrusion rotor 22 rests on the pump tube 3, and the two ends of the pump tube 3 extend to the outside of the installation inner cavity through the corresponding installation holes 11.

[0044] During use, the peristaltic pump drives the multiple extrusion rotors 22 to rotate by rotating the core 21, so that the liquid is transferred by alternately squeezing the pump tube 3 by two adjacent extrusion rotors 22. During use, the extrusion rotors 22 compress and relax the pump tube, and the sudden change of the volume of the inner cavity of the pump tube will affect the liquid flow state, which will cause pulsation in the liquid transfer process.

[0045] The supporting surface of the installation cavity supporting the pump tube 3 is structurally designed and optimized in appearance.

[0046] Specifically, the surface where the cavity wall of the installation cavity in the pump head 1 contacts the outer side of the pump tube 3 is the support surface; along the flow direction of the liquid transported by the extrusion rotor 22 type peristaltic pump, the support surface has a first straight line segment 101, an arc segment 102 and a second straight line segment 103, and the distance between the arc segment 102 and the axis of the rotating core 21 gradually increases.

[0047] Specifically, the first straight segment 101 and the second straight segment 103 are both arranged at the position where the installation inner cavity connects to the installation hole 11, and the first straight segment 101 is used to use the channel formed by the installation inner cavity extending to the installation hole 11 to force the pump tube 3 to transition from the inlet end to the subsequent functional segment channel, while the second straight segment 103 is used to use the channel formed by the installation inner cavity extending to the installation hole 11 to guide the pump tube 3 away from the rotating core 21 to extend to the outlet end. The arc segment 102 is used to cooperate with the rotating core 21 to use the extrusion rotor 22 to squeeze the pump tube 3 to transport liquid.

[0048] Along the conveying direction of the pump tube 3 in the installation cavity, the axial distance between the arc segment 102 and the rotating core 21 gradually increases. The arc segment 102 near the inlet end of the pump tube 3 makes the distance between the pump tube 3 and the rotating core 21 closer, so that the two adjacent extrusion rotors 22 can effectively squeeze the pump tube 3 at this part to ensure the effective delivery of the liquid; and as the liquid is continuously conveyed forward in the pump tube 3, the axial distance between the arc segment 102 and the rotating core 21 gradually increases, so that the amount of extrusion of the pump tube 3 by the extrusion rotor 22 gradually decreases, so that the pulse generated by the liquid flow is gradually buffered in the rear section of the arc segment 102 to achieve the elimination of the influence of pulsation in an ideal state.

[0049] In addition, the first straight line segment 101 and the second straight line segment 103 are both flat straight line segments, which can effectively fix and limit the pump tube 3 to reduce the state changes of the pump tube 3 such as running, shifting, and straightening when the pump tube 3 is alternately squeezed by the extrusion rotor 22. The pump tube 3 can always fit the curved surface of the arc segment 102 in the transition section, so that the extrusion state of the pump tube 3 by the extrusion rotor 22 meets the ideal gradual state, thereby achieving a pulse-free effect in practical applications.

[0050] Furthermore, an inlet transition section 104 is provided between the first straight line section 101 and the arc section 102 , and the inlet transition section 104 is an inwardly concave line section.

[0051] Specifically, the inlet transition section 104 mainly satisfies the requirement that the pump tube 3 can be arranged in a smooth trajectory from the first straight line section 101 to the arc section 102. The pump tube 3 introduced from the inlet end is extended from a position far away from the rotating core 21 to a position gradually approaching the rotating core 21 at this stage, and can be completely squeezed by the extrusion rotor it contacts at the end of the inlet transition section 104.

[0052] Furthermore, the arc segment 102 includes an extrusion segment 1021 and an outlet transition segment 1022 which are connected in sequence, and the extrusion segment 1021 and the outlet transition segment 1022 are both outwardly convex line segments, and 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; wherein the extrusion segment 1021 is connected to the inlet transition segment 104, and the outlet transition segment 1022 is connected to the second straight line segment 103.

[0053] Specifically, for the arc segment 102, on the one hand, the arc segment 102 needs to limit the close contact and squeezing 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 delivery flow requirement; 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 so as to buffer the flow rate fluctuation and reduce the pulsation phenomenon.

[0054] In order to meet the requirements of liquid delivery flow rate, the first half of the arc segment 102 forms an extrusion segment 1021, and the axial distance between the extrusion segment 1021 and the rotating core 21 remains unchanged, so as to ensure that the extrusion rotor 22 increases the stable extrusion force on the pump tube 3 in the extrusion segment 1021, and ensure the quantitative delivery of liquid. The pump tube 3 is completely squeezed by the extrusion rotor 22 in the extrusion segment 1021, and the liquid contained in the pump tube 3 between two adjacent extrusion rotors 22 is completely delivered to the outlet transition segment 1022, so as to ensure that the flow rate can be accurately controlled.

[0055] The outlet transition section 1022 mainly serves to reduce the influence of pulsation. To this end, from the starting position to the ending position, the distance between the arc surface of the outlet transition section 1022 and the axis of the rotating core is in a gradual state, so that the force of squeezing the pump tube 3 by the squeezing rotor 22 in the outlet transition section 1022 gradually decreases. Preferably, at the ending position of the outlet transition section 1022, the pump tube 3 is not squeezed by the squeezing rotor 22.

[0056] 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 extrusion rotor 22 peristaltic pump conveying liquid, the radius of curvature of the arc surface of the inlet transition section 104 gradually increases.

[0057] In addition, in order to accurately control the flow rate, there are certain requirements for the length of the extrusion section 1021, that is, 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.

[0058] 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 tube 3 at the extrusion section 1021 is always squeezed by the extrusion rotor 22, and the pump tube 3 between the two adjacent extrusion rotors 22 can accurately control the pumping flow rate.

[0059] In addition, in order to achieve stable flow of liquid, the first straight segment 101 is tangent to the connecting portion of the inlet transition segment 104 , the inlet transition segment 104 is tangent to the connecting portion of the arc segment 102 , and the second straight segment 103 is tangent to the connecting portion of the arc segment 102 .

[0060] Embodiment 2 is to ensure that the extruded rotor can be securely mounted on the rotating core and to ensure that after long-term use, the extruded rotor will not be damaged due to long-term single-point force, resulting in poor rolling.

[0061] like Figure 1-Figure 4 As shown, an annular groove 211 is formed on the outer circumference of the rotating core 21, a plurality of mounting grooves 212 are arranged on the bottom surface of the annular groove 211, a plurality of rollable balls 213 are arranged in the mounting grooves 212, and the extrusion rotor 22 is rotatably arranged in the annular groove 211 and abuts against the balls 213 in the corresponding mounting grooves 212;

[0062] Specifically, the extrusion rotor 22 is installed in the corresponding mounting groove 212 and supported by the ball 213 arranged in the mounting groove 212. At the same time, the extrusion rotor 22 is restricted by the groove wall of the annular groove 211 on both sides so that the extrusion rotor 22 can rotate freely in the annular groove 211 without being separated from the corresponding mounting groove 212.

[0063] When the extrusion rotor 22 extrudes the pump tube 3, the extrusion rotor 22 will simultaneously receive the reaction force generated by the pump tube 3, and the extrusion rotor 22 will apply pressure toward the mounting groove 212. The pressure applied by the extrusion rotor 22 to the mounting groove 212 can be supported by the rotatable ball 213 in the mounting groove 212. On the one hand, the multiple balls 213 in the mounting groove 212 can provide multi-point support for the extrusion rotor 22. At the same time, during the rotation of the extrusion rotor 22, the balls 213 act on the balls 213 so that the balls 213 rotate together. In this way, the extrusion rotor 22 can be prevented from being subjected to force at a single point at the same position for a long time, so as to prevent the extrusion rotor 22 from being deformed, thereby improving the reliability and stability of the peristaltic pump and extending its service life.

[0064] Furthermore, a clamping groove 214 is provided on the groove wall of the annular groove 211 . The clamping groove 214 is arranged on the outer side of the corresponding mounting groove 212 , and the extrusion rotor 22 is clamped in the clamping groove 214 .

[0065] Specifically, a recessed groove 214 is formed on the groove wall of the annular groove 211 , and the groove 214 can be used to limit the extrusion rotor 22 from rolling freely in the annular groove 211 . In addition, the groove 214 and the mounting groove 212 cooperate with each other to ensure the smooth rotation of the extrusion rotor 22 on the outside of the mounting groove 212 .

[0066] The two groove walls of the annular groove 211 are respectively provided with oppositely arranged clamping grooves 214 , and the extrusion rotor 22 is clamped between the two oppositely arranged clamping grooves 214 .

[0067] Furthermore, in order to reduce the amount of balls used and to meet the requirements of quick and reliable assembly, the groove wall of the mounting groove 212 is provided with a plurality of notches 215 , and the balls 213 are stuck in the corresponding notches 215 and can rotate in the notches 215 .

[0068] Specifically, after the extrusion rotor 22 is assembled in place, the ball 213 is limited by the notch 215, and the notch 215 is used to locate the position of the ball 213, and the ball 213 can rotate freely in the notch 215. Among them, a plurality of evenly distributed notches 215 can be set on the groove wall of the installation groove 212.

[0069] In a preferred embodiment, a flexible buffer block 23 is further disposed inside the mounting inner cavity. The flexible buffer block 23 is located between the two mounting holes 11 . The flexible buffer block 23 is configured to apply pressure to the extrusion rotor 22 .

[0070] Specifically, since the pump tube 3 is output from the two mounting holes 11 to the outside of the mounting inner cavity, and the pump tube 3 is not arranged in the area between the two mounting holes 11 inside the mounting inner cavity, when the extrusion rotor 22 moves to a position where the pump tube 3 is not arranged, it is easy for the extrusion rotor 22 at this position to be not subjected to pressure, thereby causing uneven force on the rotating core 21.

[0071] By adding a flexible buffer block 23 to the position of the installation inner cavity, the flexible buffer block 23 itself can be squeezed and deformed by the extrusion rotor 22, and then act as the pump tube 3 to provide auxiliary support for the extrusion rotor 22 moved to this position. The extrusion rotor 22 contacts the flexible buffer block 23, and the contact force between the extrusion rotor 22 and the flexible buffer block 23 can force the extrusion rotor 22 to rotate to release the extrusion force, prevent the extrusion rotor from accidentally getting stuck, and ensure that the rotating core 21 is evenly stressed during rotation.

[0072] Furthermore, the flexible buffer block 23 is a porous structure, and grease is adsorbed in the flexible buffer block 23 .

[0073] Specifically, the flexible buffer block 23 can be made of latex, silicone, rubber, gel, polymer fiber and other materials. It is elastic and can use its porous structure to absorb grease. The grease lubricates the surface of the extrusion rotor 22 and removes dust and other debris on the surface, thereby improving the reliability and stability of the pump.

[0074] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by technicians familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A peristaltic pump, characterized in that: include: A pump head, wherein a mounting inner cavity is formed inside the pump head, and the pump head is also provided with two mounting holes communicating with the mounting inner cavity, and the two mounting holes are arranged on the same side of the pump head; A pump core assembly, the pump core assembly comprising a rotating core and a plurality of extruded rotors, Pump tube; The rotating core is rotatably arranged in the installation inner cavity, the pump tube extends into the installation inner cavity and surrounds the outside of the rotating core, the extrusion rotor abuts against the pump tube, and the two ends of the pump tube extend to the outside of the installation inner cavity through the corresponding installation holes; In addition, the surface where the cavity wall of the installation cavity 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 line segment, an arc segment and a second straight line segment, and the distance between the arc segment and the axis of the rotating core gradually increases.

2. The peristaltic pump according to claim 1, characterized in that: An inlet transition section is further provided between the first straight line section and the arc section, and the inlet transition section is an inwardly concave line section.

3. The peristaltic pump according to claim 2, characterized in that: The arc segment includes an extrusion segment and an outlet transition segment connected in sequence, the extrusion segment and the outlet transition segment are both convex segments, and the distance between the arc surface of the extrusion segment and the axis of the rotating core is not greater than the distance between the arc surface of the outlet transition segment and the axis of the rotating core; Wherein, the extrusion section is connected to the inlet transition section, and the outlet transition section is connected to the second straight line section.

4. The peristaltic pump according to claim 3, characterized in that: The center of the circular arc surface of the extrusion section is located on the axis of the rotating core; along the flow direction of the liquid transported by the peristaltic pump, the curvature radius of the circular arc surface of the inlet transition section gradually increases.

5. The peristaltic pump according to claim 4, characterized in that: The central angle corresponding to the arc surface of the extrusion section is equal to or greater than the central angle formed between the centers of two adjacent extrusion rotors.

6. The peristaltic pump according to any one of claims 1 to 5, characterized in that: An annular groove is formed on the outer circumference of the rotating core, a plurality of mounting grooves are arranged on the bottom surface of the annular groove, a plurality of rollable balls are arranged in the mounting groove, and the extrusion rotor is rotatably arranged in the annular groove and abuts against the balls in the corresponding mounting grooves.

7. The peristaltic pump according to claim 6, characterized in that: A clamping groove is provided on the groove wall of the annular groove, the clamping groove is arranged on the outer side of the corresponding mounting groove, and the extrusion rotor is clamped in the clamping groove.

8. The peristaltic pump according to claim 7, characterized in that: The two groove walls of the annular groove are respectively provided with the clamping grooves arranged opposite to each other, and the extrusion rotor is clamped between the two clamping grooves arranged opposite to each other.

9. The peristaltic pump according to claim 6, characterized in that: A flexible buffer block is also disposed inside the installation inner cavity. The flexible buffer block is located between the two installation holes. The flexible buffer block is configured to apply pressure to the extrusion rotor.

10. The peristaltic pump according to claim 9, characterized in that The flexible buffer block is a porous structure, and lubricating grease is adsorbed in the flexible buffer block.

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