Peristaltic pump

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a peristaltic pump. Aiming at the problems that a roller in a peristaltic pump in the prior art only extrudes one side of a fluid hose, friction force on the hose is larger, and abrasion of the hose is accelerated, the utility model provides a peristaltic pump which comprises a motor and a driving shaft connected to the motor, and one end of the driving shaft far away from the motor is further in driving connection with a bidirectional extrusion assembly. An extrusion cavity used for containing a hose is formed in the two-way extrusion assembly, and extrusion pieces used for extruding the hose are located on the two sides of the extrusion cavity correspondingly. The pair of extrusion pieces are arranged to extrude the hose for fluid transportation, extrusion force on the single side of the hose for transporting fluid and corresponding friction force are reduced, the service life of the hose is prolonged, and the fluid transportation speed is increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical equipment, especially relates to a peristaltic pump. BACKGROUND

[0002] The working principle of the peristaltic pump is that the rollers inside the pump alternately squeeze / release the tube along a circle to convey fluid, the fluid inside the tube flows out in the direction of the pressure when squeezed, and when the tube restores to its original shape relying on its elasticity after the pressure disappears, the volume increases, negative pressure is generated, and fluid is sucked in, thereby completing continuous fluid delivery.

[0003] For example, a Chinese invention patent application discloses an electrolyte detection module and a biochemical analyzer [application number: 202411431354.1]. The invention includes a peristaltic pump including a pump body and a drive shaft, the rotating assembly includes a rotating disc, a plurality of rotating roller assemblies, and an end cover, the rotating disc is provided with a disc hole passing through the center line and a plurality of disc through holes uniformly distributed around the disc hole, the number of the disc through holes is the same as that of the rotating roller assemblies, the rotating roller assembly includes a plug column and a roller cylinder, the roller cylinder is provided with a cylinder through hole, one end of the plug column is fixed in the disc through hole and the other end protrudes and is inserted into the cylinder through hole, the plurality of roller cylinders of each rotating assembly are tangent to a common outer circle, and each roller cylinder acts on the pump tube in sequence and reciprocatingly to provide the action force of liquid flow.

[0004] The rollers in the peristaltic pump disclosed by the utility model only squeeze one side of the fluid hose, exert pressure on the hose, and the hose is subjected to greater friction, which accelerates the wear of the hose. SUMMARY

[0005] The utility model aims at the above problems, and provides a peristaltic pump with a bidirectional extrusion assembly, which realizes reduction of unilateral friction and improvement of overall flow rate by symmetrically extruding the hose.

[0006] The utility model discloses a motor and drive shaft connected on the motor, the drive shaft is still driven to be connected with bidirectional extrusion assembly on the one end away from the motor, the bidirectional extrusion assembly is equipped with extrusion cavity for placing hose, and the extrusion piece for extruding the hose is located at both sides of extrusion cavity.

[0007] Preferably, the bidirectional extrusion assembly includes an internal extrusion piece located inside the extrusion cavity and an external extrusion piece located outside the extrusion cavity, and the internal extrusion piece and the external extrusion piece are directly / indirectly connected to the drive shaft.

[0008] Preferably, the internal extrusion piece includes a roller, and the external extrusion piece is also a roller identical to the internal extrusion piece.

[0009] Preferably, the driving shaft is fixedly connected with at least one rotating disc, and the inner extruding member and the outer extruding member are distributed along different radii of the rotating disc.

[0010] Preferably, the driving shaft is fixedly connected with at least one rotating disc, and the inner extruding member and the outer extruding member are distributed along different radii of the rotating disc.

[0011] Preferably, the rotating disc comprises a large rotating disc and a small rotating disc, the large rotating disc and the small rotating disc are connected with the driving shaft and rotate around the driving shaft as the center, the rollers of the outer extruding member are distributed on the large rotating disc, and the rollers of the inner extruding member are distributed on the small rotating disc.

[0012] Preferably, the rotating disc comprises a large rotating disc and a small rotating disc, the large rotating disc and the small rotating disc are connected with the driving shaft and rotate around the driving shaft as the center; the outer extruding member is distributed on the large rotating disc, and the inner extruding member is distributed on the small rotating disc.

[0013] Preferably, the rotating disc comprises a large rotating disc and a small rotating disc, the large rotating disc and the small rotating disc are connected with the driving shaft and rotate around the driving shaft as the center; the outer extruding member is distributed on the large rotating disc, and the inner extruding member is distributed on the small rotating disc.

[0014] Preferably, the rotating disc cover is arranged to press the rotating disc on the end of the driving shaft away from the motor.

[0015] Preferably, the bidirectional extruding assembly has three groups.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] The utility model discloses a pair of extruding members are arranged to extrude the soft tube for fluid transportation, the unilateral extrusion force of the soft tube for fluid transportation and the corresponding friction force are reduced, the life of the soft tube is prolonged, and the fluid transportation speed is increased. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole schematic view of the utility model;

[0019] Figure 2 It is another view schematic view of the utility model;

[0020] Figure 3 It is Figure 2 A-A sectional view;

[0021] Figure 4 It is the explosion drawing of the utility model;

[0022] Figure 5 It is the working schematic view of the utility model;

[0023] In the figure: motor 1, drive shaft 2, bidirectional extrusion assembly 3, extrusion cavity 4, runner 5, wheel pin 6, bearing 7, runner cover 8, inner extrusion piece 31, outer extrusion piece 32, large runner 51, small runner 52, hose 100, roller 312. DETAILED DESCRIPTION

[0024] The utility model makes further detailed explanation in combination with the drawings and specific implementation.

[0025] The utility model discloses a peristaltic pump, like Figures 1-3 , 5 are shown, including motor 1 and the drive shaft 2 connected on motor 1, the drive shaft 2 is still drive connected with bidirectional extrusion assembly 3 to the one end away from motor 1, the bidirectional extrusion assembly 3 is equipped with the extrusion cavity 4 for placing hose 100 in, and the extrusion piece for extruding hose 100 is located at the both sides of extrusion cavity 4 respectively.

[0026] The utility model, when using, the hose for transmitting fluid passes through extrusion cavity 4, and the motor 1 is opened to utilize the drive shaft 2 to drive bidirectional extrusion assembly 3 to symmetric extrusion / release circulation hose two sides, reaches the purpose of conveying fluid.

[0027] Specifically, the bidirectional extrusion assembly 3 includes the inner extrusion piece 31 located inside the extrusion cavity 4 and the outer extrusion piece 32 located outside the extrusion cavity 4, and the inner extrusion piece 31 and the outer extrusion piece 32 are directly / indirectly connected to the drive shaft 2.

[0028] Further, the inner extrusion piece 31 includes a roller 312, and the outer extrusion piece 32 is also a roller 312 identical to the inner extrusion piece 31.

[0029] To drive the roller to rotate and extrude the hose, it is easily thought that the drive shaft 2 directly drives the roller 312, and the diameter of the drive shaft 2 is very large, which obviously cannot achieve the purpose of motor general compatibility. Therefore, the drive shaft 2 is fixedly connected to at least one rotating disc, the inner extrusion piece 31 and the outer extrusion piece 32 are axially distributed along different radii of the rotating disc center, the rotating disc is driven to rotate by the drive shaft 2, and the rollers 312 of the inner extrusion piece 31 and the outer extrusion piece 32 are driven to rotate to alternately extrude the hose.

[0030] Because centrifugal force will appear during rotation, it is easy to make the extrusion piece unstable, therefore, the scheme of symmetrically fixing the extrusion piece on both sides is adopted. Specifically, the drive shaft 2 is fixedly connected to at least one runner 5, and the inner extrusion piece 31 and the outer extrusion piece 32 are fixedly penetrated in the runner 5 and axially distributed along different radii of the runner 5 center.

[0031] For the convenience of assembly, if the rotating disc scheme is adopted, the rotating disc includes a large rotating disc and a small rotating disc, the large rotating disc and the small rotating disc are connected with the driving shaft 2 and rotate around the driving shaft 2 as the center, the rollers 312 of the outer extruding member 32 are distributed on the large rotating disc, and the rollers 312 of the inner extruding member 31 are distributed on the small rotating disc.

[0032] Similarly, if the rotating wheel 5 scheme is adopted, the rotating wheel 5 includes a large rotating wheel 51 and a small rotating wheel 52, the small rotating wheel 52 is accommodated in the large rotating wheel 51, the large rotating wheel 51 and the small rotating wheel 52 are connected with the driving shaft 2 and rotate around the driving shaft 2 as the center, the outer extruding member 32 is distributed on the large rotating wheel 51, and the inner extruding member 31 is distributed on the small rotating wheel 52.

[0033] Specifically, as shown in Figure 3 、 4 , the roller 312 is connected with the rotating wheel 5 through the wheel pin 6 and the bearing 7. The wheel pin 6 is fixedly connected with the inner walls on both sides of the rotating wheel 5, the wheel pin 6 and the roller 312 are slidingly connected through the bearing 7, and the wheel pin 6 extrudes the bearing 7 to drive the roller 312 to move.

[0034] Preferably, as shown in Figure 1 、 3 , the rotating wheel cover 8 is further included, the rotating wheel cover 8 is located at the end of the driving shaft 2 away from the motor and presses the rotating wheel 5 on the driving shaft 2.

[0035] Preferably, the bidirectional extruding assembly 3 has three groups, so as to improve the fluid transportation efficiency.

[0036] The working principle of the utility model is as follows: the motor 1 is started to drive the driving shaft 2 to rotate, and the driving shaft 2 drives the rotating disc or the rotating wheel 5 to rotate. In the case of the rotating wheel 5, the large rotating wheel 51 and the small rotating wheel 52 are pressed and fixed on the driving shaft 2 by the rotating wheel cover 8. The large rotating wheel 51 and the small rotating wheel 52 are driven to rotate, the large rotating wheel 51 drives the outer extruding member 32 to rotate, the small rotating wheel 52 drives the inner extruding member 31 to rotate, the outer extruding member 32 and the inner extruding member 31 rotate at the same angular velocity, and specifically, the rollers 312 of the inner extruding member 31 and the outer extruding member 32 are symmetrically and sequentially extruded and released in turn to realize the fluid transportation.

[0037] The specific embodiments described in the present document are only illustrative of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the utility model or exceed the range defined by the appended claims.

[0038] Although the terms motor 1, drive shaft 2, bidirectional extrusion assembly 3, extrusion cavity 4, runner 5, wheel pin 6, bearing 7, runner cover 8, inner extrusion piece 31, outer extrusion piece 32, large runner 51, small runner 52, hose 100, roller 312 and the like are used more frequently in the text, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the utility model; it is contrary to the spirit of the utility model to interpret them as any kind of additional limitation.

Claims

1. A peristaltic pump comprising an electric motor (1) and a drive shaft (2) connected to the electric motor (1), characterized in that: The driving shaft (2) is further connected with a bidirectional extrusion assembly (3) at the end far from the motor (1), the bidirectional extrusion assembly (3) is internally provided with an extrusion cavity (4) for placing a hose (100), and extrusion members for extruding the hose (100) are respectively arranged at both sides of the extrusion cavity (4).

2. The peristaltic pump of claim 1, wherein: The bidirectional extrusion assembly (3) comprises an internal extrusion member (31) arranged inside the extrusion cavity (4) and an external extrusion member (32) arranged outside the extrusion cavity (4), and the internal extrusion member (31) and the external extrusion member (32) are directly / indirectly connected to the driving shaft (2).

3. The peristaltic pump of claim 2, wherein: The internal extrusion member (31) comprises a roller (312), and the external extrusion member (32) is also a roller (312) same as the internal extrusion member (31).

4. The peristaltic pump of claim 3, wherein: The driving shaft (2) is fixedly connected with at least one rotating disc, and the internal extrusion member (31) and the external extrusion member (32) are axially distributed along different radii of the rotating disc.

5. The peristaltic pump of claim 3, wherein: The driving shaft (2) is fixedly connected with at least one rotating wheel (5), and the internal extrusion member (31) and the external extrusion member (32) are fixedly arranged through the rotating wheel (5) and axially distributed along different radii of the rotating wheel (5).

6. The peristaltic pump of claim 4, wherein: The rotating disc comprises a large rotating disc and a small rotating disc, the large rotating disc and the small rotating disc are connected to the driving shaft (2) and rotate around the driving shaft (2) as the center, the rollers (312) of the external extrusion member (32) are arranged on the large rotating disc, and the rollers (312) of the internal extrusion member (31) are arranged on the small rotating disc.

7. The peristaltic pump of claim 5, wherein: The rotating wheel (5) comprises a large rotating wheel (51) and a small rotating wheel (52) internally provided with a cavity, the small rotating wheel (52) is accommodated in the large rotating wheel (51), and the large rotating wheel (51) and the small rotating wheel (52) are connected to the driving shaft (2) and rotate around the driving shaft (2) as the center; the external extrusion member (32) is arranged on the large rotating wheel (51), and the internal extrusion member (31) is arranged on the small rotating wheel (52).

8. The peristaltic pump of claim 5, wherein: Further comprising a wheel pin (6) and a bearing (7), the wheel pin (6) is fixedly connected to the outer walls on both sides of the rotating wheel (5), the wheel pin (6) and the roller (312) are rotationally connected through the bearing (7), and the wheel pin (6) extrudes the bearing (7) to drive the roller (312) to move.

9. The peristaltic pump of claim 5, wherein: Further comprising a rotating wheel cover (8), the rotating wheel cover (8) is arranged at the end of the driving shaft (2) far from the motor (1) and presses the rotating wheel (5) on the driving shaft (2).

10. The peristaltic pump of claim 1, wherein: The bidirectional extrusion assembly (3) has three groups.

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