Peristaltic pump with adjustable distance between roller and extrusion outer ring

Abstract

The utility model belongs to the technical field of peristaltic pumps, and particularly relates to a peristaltic pump with an adjustable distance between a roller and an extrusion outer ring. Comprising a main panel; the extrusion outer ring is fixed on the main panel; the driving disc rotates relative to the extrusion outer ring, and a plurality of rollers are arranged on the driving disc in the circumferential direction; the bearing seat comprises an upper mounting seat and a lower mounting seat which are connected with each other, a mounting hole is formed in the driving disc, the lower mounting seat is clamped in the mounting hole and is fixed with the driving disc through a fixing piece, and the lower mounting seat can still be clamped in the mounting hole after rotating by a certain angle along the central axis of the mounting hole; and the upper mounting seat is rotationally connected with the roller through a rotating bearing. The eccentric distance exists between the central shafts of the lower mounting seat and the upper mounting seat, and the lower mounting seat is inserted into the mounting hole after rotating by a certain angle along the central shaft of the mounting hole, so that the gap between the roller and the extrusion outer ring can be conveniently adjusted, the product percent of pass is improved, and the processing precision requirement is reduced.

Description

Technical Field

[0001] This application belongs to the field of peristaltic pump technology, and particularly relates to a peristaltic pump with adjustable distance between the roller and the extrusion outer ring. Background Technology

[0002] A peristaltic pump works by placing a flexible tube between a squeezing roller and a squeezing outer ring on a drive disc. The gap between the squeezing roller and the squeezing outer ring is less than twice the tube wall thickness, thus cutting off the fluid flow in the pipeline and guiding the fluid movement under the rotation of the drive disc. The peristaltic pump also uses guide rollers to confine the tube within the grooves of the guide rollers. The gap between the groove surface of the guide roller and the squeezing outer ring is generally greater than one time the outer diameter of the tube but less than twice the outer diameter, thus guiding the tube and ensuring smooth liquid flow. High precision is required for the distance between the squeezing roller and the squeezing outer ring, and between the guide roller and the squeezing outer ring.

[0003] However, due to processing errors, assembly errors, etc., the gap control accuracy between the extrusion roller and the extrusion outer ring, and between the guide roller and the extrusion outer ring is poor, which affects the liquid pressure and injection accuracy in the pipeline. If the gap accuracy is to be improved, not only are the accuracy requirements of individual parts very high, which increases the scrap rate of incoming parts, but the processing and assembly accuracy requirements are also very high. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this application provides a peristaltic pump with an adjustable distance between the roller and the outer extrusion ring, which can easily adjust the distance and improve the distance accuracy.

[0005] To achieve the above objectives, the technical solution provided in this application is as follows:

[0006] In a first aspect, this application provides a peristaltic pump with an adjustable gap between the roller and the outer compression ring for delivering fluid guided in a hose, comprising:

[0007] Main panel;

[0008] The extruded outer ring is fixed to the main panel;

[0009] Compared to the drive disc that rotates the outer ring of the extrusion ring, the drive disc has multiple rollers arranged along the circumference.

[0010] The bearing housing includes an upper mounting base and a lower mounting base connected together. The lower mounting base is engaged with the drive disk by a snap-fit ​​assembly and fixed by a fastener. The lower mounting base can still be engaged with the drive disk after rotating a certain angle along its central axis. The upper mounting base is rotatably connected to a roller via a rotating bearing. The central axes of the upper and lower mounting bases are eccentrically set.

[0011] Optionally, the snap - fit component includes a mounting hole and a snap - block that snaps into the mounting hole. One of the mounting hole or the snap - block is provided on the lower mounting base, and the other is provided on the drive disk; the snap - block can still be snapped into the mounting hole after rotating a certain angle along the central axis of the lower mounting base.

[0012] Optionally, the roller includes a squeezing roller and / or a guiding roller. The squeezing roller cooperates with the squeezing outer ring to squeeze the hose together to guide the fluid. A guiding groove for accommodating the hose is provided between the outer circumferential side of the guiding roller outer ring and the squeezing outer ring.

[0013] Optionally, the cross - section of the upper mounting base is circular.

[0014] Optionally, the snap - block is circular, regular polygon, "rice" - shaped, "one" - shaped or at least two circular positioning pins.

[0015] Optionally, it further includes a main bearing, a main shaft, and a driving member for driving the main shaft to rotate. The drive disk is connected to the inner ring of the main bearing through the main shaft; the outer ring of the main bearing is fixed on the main panel through a bearing housing.

[0016] Optionally, the driving member includes a motor, and the output shaft of the motor is connected to the main shaft through a coupling.

[0017] Optionally, the center of the drive disk is fixed on the main shaft through screws and a key.

[0018] Optionally, the inner ring of the rotating bearing is fixed to the upper mounting base, the outer ring of the rotating bearing is fixed to the squeezing roller, and a snap - ring is used for limiting the position between the squeezing roller and the upper mounting base.

[0019] Compared with the prior art, the present application has at least the following beneficial effects:

[0020] In the present application, the central axes of the lower mounting base that is snap - connected to the drive board and the upper mounting base that is rotationally connected to the roller through a rotating bearing are eccentrically arranged, and there is an eccentricity between the two central axes. By rotating the lower mounting base along the central axis of the mounting hole by a certain angle and then inserting it into the mounting hole, the gap between the roller and the squeezing outer ring can be conveniently adjusted, improving the product qualification rate and reducing the processing precision requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1This is a schematic diagram of the structure of a peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram illustrating the connection structure between the drive disk and the spindle in an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the connection structure between the extrusion roller and the drive disk in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram illustrating the principle of adjusting the distance between the pressure roller and the pressure outer ring by rotating the lower mounting base in this application; where a and b represent the states of the lower mounting base rotating to two different positions along the central axis of the mounting hole; c is a side view.

[0026] Figure 5 This is a schematic diagram of the extrusion roller and pressure outer ring structure with a square lower mounting base in this application;

[0027] Figure 6 This is a schematic diagram of the structure in this application where the lower mounting base is engaged with the drive disc via a positioning pin.

[0028] Figure 7 This is a schematic diagram showing the lower mounting base in this application being engaged with the "I"-shaped mounting hole via a cross-shaped mounting hole;

[0029] Figure 8 This is a schematic diagram showing the connection between the lower mounting base and the drive disk in this application, where the "I"-shaped locking block on the drive disk and the "X"-shaped locking slot on the lower mounting base are engaged.

[0030] Figure 9 This is a schematic diagram showing the engagement state between the positioning pin on the drive disk and the mounting hole composed of multiple insertion holes on the lower mounting base in this application.

[0031] Figure 10 This is a schematic diagram showing the engagement state of at least two dot-shaped locating pins on the lower mounting base with the mounting holes formed by multiple insertion holes of the drive disk in this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Main panel; 11. Bottle holder; 12. Medicine bottle; 2. Hose; 21. Pipe inlet section; 22. Pipe outlet section; 3. Upper and lower pipe assembly; 4. Extrusion outer ring; 5. Roller; 51. Extrusion roller; 52. Rotary bearing; 53. Snap ring; 54. Guide roller; 6. Drive disc; 61. Mounting hole; 62. Main shaft; 63. Main bearing; 631. Main bearing inner ring; 632. Main bearing outer ring; 64. Motor; 65. Screw; 66. Key; 67. Bearing housing; 68. Coupling; 7. Bearing seat; 71. Upper mounting seat; 72. Lower mounting seat; 73. Fixing component. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0035] Example 1:

[0036] like Figures 1-3 As shown, a peristaltic pump with an adjustable gap between the rollers and the outer compression ring, for conveying fluid guided in a hose 2, includes:

[0037] Main panel 1;

[0038] The extrusion outer ring 4 is fixed to the main panel 1;

[0039] The drive disk 6, which rotates relative to the outer ring 4, has multiple rollers 5 arranged along the circumferential direction.

[0040] Bearing housing 7: includes an upper mounting seat 71 and a lower mounting seat 72 connected together. The drive disk 6 has a mounting hole 61 adapted to the lower mounting seat 72. The lower mounting seat 72 is engaged in the mounting hole 61 and fixed to the drive disk 6 by a fastener 73. The lower mounting seat 72 can still be engaged in the mounting hole 61 after rotating a certain angle along the central axis of the mounting hole 61. The upper mounting seat 71 is rotatably connected to the roller 5 through a rotating bearing 52. The central axes of the upper mounting seat 71 and the lower mounting seat 72 are eccentrically set.

[0041] There is an eccentricity between the central axes of the lower mounting base 72 and the upper mounting base 71. By rotating the lower mounting base 72 along the central axis of the mounting hole 61 by a certain angle and then inserting it into the mounting hole 61, the gap between the roller 5 and the extrusion outer ring 4 can be easily adjusted, which improves the product qualification rate and reduces the processing accuracy requirements.

[0042] In this embodiment, the roller 5 includes a compression roller 51 and / or a guide roller 54. The compression roller 51 cooperates with the compression outer ring 4 to compress the hose 2 and guide the fluid. The guide roller 54 has a guide groove between its outer ring and the compression outer ring 4 to accommodate the hose 2. Thus, the distance between the compression roller 51 and the compression outer ring 4, and the distance between the guide roller 54 and the compression outer ring 4, can both be adjusted. Example

[0043] The difference between this embodiment and embodiment 1 is that: medicine bottles 12 and bottle holders 11 that support medicine bottles 12 are also installed on the main panel 1. In this embodiment, there are three medicine bottles 12. An upper and lower tube device 3 is also provided for the upper and lower tubes between the extrusion roller 51 and the extrusion outer ring 4. The liquid medicine in the medicine bottle 12 is sucked into the hose 2 of the peristaltic pump through the inlet section 21 of the pipeline and then discharged from the outlet section 22 of the pipeline, so as to realize simultaneous drug suction and injection.

[0044] like Figure 2 As shown, the peristaltic pump also includes a main bearing 63, a main shaft 62, and a drive component for driving the main shaft 62 to rotate. The drive disc 6 is connected to the inner ring 631 of the main bearing 63 via the main shaft 62; the outer ring 632 of the main bearing 63 is fixed to the main panel 1 via a bearing housing 67. Rotation of the main shaft 62 drives the inner ring 631 and the drive disc 6 to rotate. In this embodiment, the drive component is a motor 64, and the output shaft of the motor 64 is connected to the main shaft 62 via a coupling 68. The center of the drive disc 6 is fixed to the main shaft 62 by screws 65 and key 66. This enables the electrodes to drive the drive disc 6 and its rollers 5 to rotate.

[0045] like Figure 3 As shown, the inner ring of the rotating bearing 52 is fixed to the upper mounting base 71, and the outer ring of the rotating bearing 52 is fixed to the extrusion roller 51. The extrusion roller and the upper mounting base 71 are limited by a retaining spring 53. The lower mounting base 72 is fixed relative to the drive disk 6, and the extrusion roller 51 (outer ring of the rotating bearing 52) can roll relative to the inner ring of the rotating bearing 52. The guide roller 54 is installed in a similar manner to the extrusion roller 51, and will not be described further here.

[0046] pass Figure 2 , Figure 3 It is known that many parts affect the gap between the extrusion outer ring 4 and the extrusion roller 51. Besides the precision control of each individual part, they are assembled and fitted together by multiple parts such as the rotating bearing 52, bearing seat 7, drive disc 6, main shaft 62, main bearing 63, and bearing housing 67. To control the precision of the gap x value between the outer circumference of the extrusion roller 51 and the extrusion outer ring 4 to within 0.05mm, the total precision of the assembled parts needs to reach within 0.05mm. The average precision of a single part needs to be less than 0.05 / 8 = 0.00625mm, which is extremely difficult to achieve in the machining industry. Even if achieved, the price of a single part is enormous, and the yield rate is extremely low. Therefore, the peristaltic pump design with an adjustable gap between the roller 5 and the extrusion outer ring 4 in this application is of great significance.

[0047] In this embodiment, the upper mounting base 71 has a circular cross-section, which facilitates its positioning with the inner ring of the bearing.

[0048] In this embodiment, the lower mounting base 72 also has a circular cross-section. The principle of adjusting the spacing by rotating the lower mounting base 72 in this application is as follows: Figure 4 As shown, a large circle represents the extrusion outer ring 4, and a small circle represents the extrusion roller 51. A is the central axis of the upper mounting seat 71, and B is the central axis of the lower mounting seat 72. When the lower mounting seat 72 rotates along the central axis of the mounting hole 61, such as from Figure 4 a rotates to Figure 4 b as shown, the gap between the large circle and the small circle changes, that is, the adjustment of the distance between the extrusion roller 51 and the extrusion outer ring 4 is realized. The guiding roller 54 has the same principle as the extrusion outer ring 4. When the cross-section of the lower mounting seat 72 is circular, the stepless adjustment of the distance can be achieved.

[0049] In addition, the cross-section of the lower mounting seat 72 for clamping can also be a regular polygon, a "rice" shape, a "one" shape (such as Figure 7 , at this time the mounting hole 61 can be in the shape of a "rice"), or others, as long as the lower mounting seat 72 can still be clamped in the mounting hole 61 after rotating a certain angle along the central axis of the mounting hole 61. The principle of adjusting the distance is the same as that of the lower mounting seat 72 with a circular cross-section for adjusting the distance. However, only when the cross-section is circular can the stepless adjustment of the distance be achieved. When the cross-section is of other shapes, the distance adjustment is intermittent. When the number of sides of the polygon increases, the span of the distance adjustment is smaller and the accuracy is higher.

[0050] Taking the cross-section as a square as an example, as Figure 5 shown, the gap between the extrusion roller 
51 and the extrusion outer ring 4 is denoted as X, the radius of the concentric arc section of the extrusion outer ring 4 is denoted as D, the distance from the center of the lower mounting seat 72 (square groove) to the center of the driving disk 6 is denoted as L, the radius of the extrusion roller 51 is d, and the eccentric distance between the upper mounting seat 71 and the lower mounting seat 72 on the bearing seat 7 is denoted as x. By rotating the lower mounting seat 72, there are three situations for the distance X between the extrusion roller 51 and the extrusion outer ring 4: X = D - L - d; X = D - L - d - x; X = D - L - d + x. Select the one that is closest to the accuracy requirement in X.

[0051] As Figure 6 shown, it can also be that 2 or more positioning pins (2 in the figure) are provided on the lower mounting seat 72, and multiple jacks are arranged on the circumferential side of the mounting hole 61 on the driving disk 6. The positioning pins can be inserted or inserted into different jack combinations after rotation, so that the distance can also be adjusted. As Figure 9 shown, it can also be that the positioning pins are provided on the driving disk 6, and the mounting hole composed of multiple jacks is provided on the lower mounting seat 72.

[0052] As Figure 8 shown, it can also be that the lower mounting seat 72 and the driving disk 6 are clamped by the "one" - shaped clamping block on the driving disk 6 and the "rice" - shaped slot on the lower mounting seat. After the angle adjustment, the distance adjustment can also be achieved.

[0053] Figure 10As shown, it can also be a schematic diagram of the mounting hole engagement state formed by at least two cylindrical positioning pins on the lower mounting base 72 and multiple insertion holes of the drive disk 6, which can also realize the spacing adjustment. Example

[0054] This embodiment provides a method for adjusting the distance between the roller and the outer extrusion ring of a peristaltic pump, based on the peristaltic pump in Embodiment 2, including the following steps:

[0055] Based on historical scenarios, the maximum historical deviation between the distance between roller 5 and the extrusion outer ring 4 and the required distance was determined.

[0056] The center axis eccentricity distance of the upper mounting base 71 and the lower mounting base 72 is set according to the historical maximum deviation.

[0057] Rotate the lower mounting base 72 along the center of the mounting hole 61 until the distance between the roller 5 and the extrusion outer ring 4 reaches the preset target.

[0058] Based on the historical maximum deviation, the center axis eccentricity distance between the upper mounting base 71 and the lower mounting base 72 is set as follows: eccentricity distance ≥ historical maximum deviation.

[0059] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A peristaltic pump with adjustable spacing between rollers and an outer compression ring for conveying fluid guided in a hose, characterized in that, Comprising: Main panel; Extrusion outer ring fixed to the main panel; Drive disk rotating relative to the extrusion outer ring, with a plurality of rollers arranged circumferentially on the drive disk; Bearing housing, including an upper mounting seat and a lower mounting seat connected together. The lower mounting seat is snap-connected to the drive disk through a snap connection component and fixed through a fixing component; the lower mounting seat can still be snap-connected to the drive disk after rotating a certain angle along the central axis of the lower mounting seat; the upper mounting seat is rotatably connected to the roller through a rotating bearing; the central axes of the upper mounting seat and the lower mounting seat are eccentrically arranged.

2. The peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to claim 1, characterized in that, The snap connection component includes a mounting hole and a snap block snap-connected to the mounting hole. One of the mounting hole or the snap block is arranged on the lower mounting seat, and the other is arranged on the drive disk; the snap block can still be snap-connected in the mounting hole after rotating a certain angle along the central axis of the lower mounting seat.

3. A peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to claim 1, characterized in that, The roller includes an extrusion roller and / or a guiding roller. The extrusion roller cooperates with the extrusion outer ring to jointly extrude the hose to guide the fluid. A guiding groove for accommodating the hose is provided between the outer circumferential side of the guiding roller and the extrusion outer ring.

4. A peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to claim 1, characterized in that, The cross-section of the upper mounting seat is circular.

5. A peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to claim 2, characterized in that, The snap block is circular, regular polygon, "rice" shaped, "one" shaped or at least two circular positioning pins.

6. A peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to claim 1, characterized in that, It further includes a main bearing, a main shaft and a driving member for driving the main shaft to rotate. The drive disk is connected to the inner ring of the main bearing through the main shaft; the outer ring of the main bearing is fixed to the main panel through a bearing housing.

7. A peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to claim 6, characterized in that, The driving member includes a motor, and the output shaft of the motor is connected to the main shaft through a coupling.

8. A peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to claim 6, characterized in that, The center of the drive disk is fixed to the main shaft through screws and a key.

9. A peristaltic pump with adjustable distance between the roller and the outer extrusion ring according to claim 1, characterized in that, The inner ring of the rotating bearing is fixed to the upper mounting seat, the outer ring of the rotating bearing is fixed to the extrusion roller, and the extrusion roller is limited by a snap ring between the extrusion roller and the upper mounting seat.

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