Infusion pump peristaltic device

Abstract

The present invention discloses a peristaltic device for an infusion pump, comprising a shell and an extrusion assembly, wherein a receiving chamber for installing the extrusion assembly is provided in the shell, and the side wall of the receiving chamber has two arc-shaped bearing surfaces for extruding an elastic hose which are symmetrical up and down, and two upper and lower channels for laying the elastic hose are respectively formed between the extrusion assembly and the two bearing surfaces; an extrusion wheel for extruding the elastic hose and a reset wheel for assisting the elastic hose in rebounding are provided at the outer edge of the extrusion assembly, and a circle of grooves for accommodating the elastic hose are provided on the side wall of the reset wheel; by providing the reset wheel, the present application can effectively assist the auxiliary hose in rebounding and resetting, thereby greatly reducing the loss of the hose's rebound performance, ensuring the stability of the delivery accuracy, and extending the service life of the hose; at the same time, one machine with two channels is also realized, thereby improving the utilization rate of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of squeeze pumps, and in particular relates to a peristaltic device of an infusion pump. Background Art

[0002] Peristaltic pumps transport fluids by squeezing soft tubes. Due to their unique working principle, they have the advantages of stable and high output flow, and the fluid only contacts the pump tube, so there is no contamination inside the pump. Therefore, they are widely used in fluid transportation that requires high precision and is easily contaminated, such as in the food and pharmaceutical industries.

[0003] The peristaltic extrusion structure of the existing infusion pump generally realizes the extrusion of the hose by circular or linear motion of the roller. The hose is reciprocatingly squeezed and then rebounds to achieve one extrusion and one suction of the fluid. Therefore, the degree of rebound and reset of the hose after being squeezed directly affects the amount of sucked fluid. If the rebound performance decreases, the accuracy of liquid delivery will be reduced. The hose is reciprocatingly squeezed for a long time, which is easy to form a dead edge, and the rebound performance is gradually reduced. In addition, the roller wears one side of the tube for a long time, which greatly shortens the service life of the tube. In order to solve the above problems, frequent replacement of hoses and use of hoses with better material performance will inevitably increase the cost of use.

[0004] The prior art provides a mounting component and a peristaltic pump (CN106232155A), which comprises: a stator having a mounting recess on which a flexible tube to be squeezed is mounted; a rotor that can be driven to rotate inside the mounting recess; a roller that compresses the flexible tube to be squeezed mounted in the mounting recess in a radial direction and squeezes the tube in a longitudinal direction as the rotor rotates, thereby causing the fluid to flow;

[0005] The above-mentioned prior art peristaltic pump has the following technical problems:

[0006] 1. The roller repeatedly compresses the flexible tube in the radial direction. The rebound of the flexible tube can only rely on its own performance. After a long period of extrusion, the rebound performance of the flexible tube gradually decreases or even forms a dead edge, and the accuracy of infusion will also be greatly reduced;

[0007] 2. The roller extrusion of the flexible hose is always on one side of the flexible hose, which will cause serious wear on one side of the flexible hose and less wear on the other side. As long as one side is seriously worn, there will be a risk of rupture, so it can only be replaced. It can be seen that only one-side extrusion greatly shortens the life of the flexible hose;

[0008] 3. The structure of the peristaltic pump can only squeeze and infuse one flexible hose, and has only one delivery channel. It is not possible to use one motor and roller structure to simultaneously deliver liquids to two flexible hoses, and it is not possible to achieve multiple uses of one machine. Summary of the invention

[0009] In view of the above-mentioned technical problems existing in the prior art, an embodiment of the present invention provides a peristaltic device for an infusion pump.

[0010] In order to solve the above technical problems, the technical solution adopted in the embodiments of the present invention is:

[0011] A peristaltic device for an infusion pump comprises a housing and an extrusion assembly, wherein the extrusion assembly is rotatably mounted in the housing, a passage for laying an elastic hose is provided between the extrusion assembly and the housing, a receiving cavity for installing the extrusion assembly is provided in the housing, and two arc-shaped bearing surfaces for extruding the elastic hose are provided on the side wall of the receiving cavity, which are symmetrical in terms of the upper and lower directions, and the two arc-shaped bearing surfaces are both located on a circle, and two upper and lower passages for laying the elastic hose are respectively formed between the extrusion assembly and the two bearing surfaces;

[0012] The outer edge of the extrusion assembly is provided with an extrusion wheel for extruding the elastic hose and a reset wheel for assisting the elastic hose to rebound. The side wall of the reset wheel is provided with a circle of grooves for accommodating the elastic hose. The rotation of the extrusion assembly can drive the extrusion wheel and the reset wheel to roll along the arc-shaped bearing surface. After the extrusion wheel squeezes the elastic hose, the two side walls of the reset wheel groove assist the elastic hose to rebound and recover.

[0013] Preferably, at least one of the extrusion wheel and the reset wheel is provided, and the axes of the extrusion wheel and the reset wheel are located on the same circle.

[0014] Preferably, the diameter of the groove is equal to the diameter of the elastic hose.

[0015] Preferably, the reset wheel has an adjusting device capable of adjusting the width of the groove.

[0016] Preferably, the reset wheel comprises a fixed shaft, one end of which is fixedly provided with a fixed wheel, and the other end of which is fixedly provided with an adjusting wheel;

[0017] The adjusting wheel comprises a cylindrical outer cover and a sliding column, wherein the sliding column is inserted into the outer cover and a spring is pressed between the sliding column and the outer cover, so that the sliding column can be elastically extended and retracted along the adjusting axis direction;

[0018] The outer cover and the sliding column are both mounted on the fixed shaft, the outer cover and the fixed shaft are fixedly arranged, and the sliding column can slide on the fixed shaft;

[0019] A top screw is arranged on the side wall of the outer cover, and when the top screw is pressed against the side wall of the sliding column, the sliding block can be prevented from sliding.

[0020] Preferably, the housing comprises:

[0021] A base, a motor is fixed to the rear side of the base, a rotating shaft of the motor is connected to an extrusion assembly and the extrusion assembly is located at the front side of the base;

[0022] The upper slider and the lower slider are symmetrically arranged at the upper and lower parts of the base, respectively, and the receiving cavity is formed between the upper slider and the lower slider;

[0023] The upper sliding block and the lower sliding block can both slide up and down in the vertical direction.

[0024] Preferably, both the upper slider and the lower slider have the arc-shaped bearing surface.

[0025] Preferably, the base is provided with a blocking edge which can be respectively matched with the upper slider and the lower slider, and is used for limiting the sliding position of the upper slider and the lower slider.

[0026] Preferably, the upper and lower sliding blocks are provided with sliding rails which are wide at the top and narrow at the bottom on the surfaces where they fit the base, and the base is provided with sliding grooves adapted to the sliding rails, so that the upper and lower sliding blocks cannot separate when sliding on the base and maintain a tight fit.

[0027] Preferably, the upper slider and the lower slider are both provided with block holes, and the base is provided with block holes corresponding thereto, and when the upper slider and the lower slider slide to the working position, blocks are inserted into the block holes to fix the upper slider and the lower slider to the base.

[0028] Compared with the prior art, the beneficial effects of the peristaltic device of the infusion pump provided by the embodiment of the present invention are:

[0029] 1. A reset wheel is set in the extrusion assembly. The reset wheel is set with a circle of grooves. The hose is laid in the groove. After the hose is squeezed, the two side walls of the groove will assist the hose to rebound and reset, instead of relying solely on the hose's own rebound performance. This greatly reduces the loss of the hose's rebound performance, ensures the stability of the delivery accuracy, and extends the service life of the hose;

[0030] 2. The reset wheel has an adjustment device capable of adjusting the width of the groove, so that the peristaltic pump of the present application can be adapted to flexible hoses of different diameters;

[0031] 3. The extrusion assembly of the peristaltic device provided by the present invention and the two bearing surfaces respectively form two symmetrical channels for laying the elastic hose. Firstly, a set of rotating mechanisms can be used to realize the transportation of the two channels, so that one machine can be used for two purposes. Secondly, the upper slider and the lower slider are arranged in the sliding structure of the base, which is very convenient for installing the hose. It is only necessary to lay the hose on the extrusion assembly and then reset and fix the slider.

[0032] 4. Two symmetrical channels are designed, and the upper and lower sliders are set in the sliding structure of the base. When one channel is used, if one side of the hose is squeezed and worn for a long time, the upper and lower sliders can be pulled apart, and the hose does not need to be disassembled. It can be directly moved to the opposite channel to achieve alternating squeezing and wear on both sides of the hose, and can also extend the hose life to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of the peristaltic device of the infusion pump provided in the embodiment of the present invention Figure 1 (without protective cover).

[0034] Figure 2 Schematic diagram of the structure of the peristaltic device of the infusion pump provided in the embodiment of the present invention Figure 2 .

[0035] Figure 3 This is a structural exploded view of the peristaltic device of the infusion pump provided in an embodiment of the present invention.

[0036] Figure 4 A front view of the peristaltic device of the infusion pump provided in an embodiment of the present invention (without protective cover).

[0037] Figure 5 A schematic structural diagram of an extrusion assembly provided in an embodiment of the present invention.

[0038] Figure 6 A front view of an extrusion assembly provided in an embodiment of the present invention.

[0039] Figure 7 This is a structural exploded view of the reset wheel provided in an embodiment of the present invention.

[0040] Figure 8 This is a cross-sectional view of a reset wheel provided in an embodiment of the present invention.

[0041] Fig. 9 A schematic structural diagram of a base provided in an embodiment of the present invention.

[0042] Fig.10 This is a schematic diagram of the structure of an upper slider or a lower slider provided in an embodiment of the present invention.

[0043] In the figure:

[0044] 100-housing; 200-extrusion assembly; 101-receiving chamber; 102-channel; 1-bracket; 2-extrusion wheel; 3-reset wheel; 4-motor; 5-base; 6-upper slider; 7-lower slide fast; 8-block; 9-clip; 10-elastic hose; 11-connector; 12-protective cover; 31-fixed shaft; 32-fixed wheel; 33-adjusting wheel; 34-groove; 51-slide groove; 52-block hole; 53-blocking edge; 54-mounting groove; 61-slide rail; 62-bearing surface; 331-outer cover; 332-slide column; 333-top screw; 334-top screw groove; 335-spring; 336-threaded hole. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up” and “down” are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0047] like Figures 1 to 6As shown, an embodiment of the present invention discloses a peristaltic device for an infusion pump, comprising a shell 100 and an extrusion assembly 200, the extrusion assembly 200 is rotatably installed in the shell 100, a channel 102 for laying an elastic hose 10 is provided between the extrusion assembly 200 and the shell 100, a receiving chamber 101 for installing the extrusion assembly 200 is provided in the shell 100, and two arc-shaped bearing surfaces 62 for extruding the elastic hose 10 are symmetrically provided on the side wall of the receiving chamber 101, and the two arc-shaped bearing surfaces 62 are both located on a circle, and two upper and lower channels 102 for laying the elastic hose 10 are respectively formed between the extrusion assembly 200 and the two bearing surfaces 62, and the two channels 102 for laying the elastic hose 10 extend out of the shell 100 to the left and right sides respectively, the extrusion assembly 200 comprises a bracket 1, and an extrusion wheel 2 for extruding the elastic hose 10 and a reset wheel 3 for assisting the elastic hose 10 to rebound are provided on the outer edge of the bracket 1, the extrusion wheel 2 and the reset wheel 3 are both rotatably fixed to the bracket 1 through an axis, and the reset wheel 3 The side wall is provided with a circle of grooves 34 for accommodating the elastic hose 10. The rotation of the extrusion assembly 200 can drive the extrusion wheel 2 and the reset wheel 3 to roll along the arc-shaped bearing surface 62. A certain gap is left between the outer wall of the extrusion wheel 2 and the bearing surface 62, that is, the thickness of the hose after being extruded. A certain fit is formed between the maximum diameter outer wall of the reset wheel 3 and the bearing surface 62. The gap of the fit is sufficient to ensure that the elastic hose 10 does not slip out of the groove 34. When the extrusion wheel 2 squeezes the elastic hose 10, the groove 34 of the reset wheel 3 The two side walls assist the elastic hose 10 to rebound and recover, therefore, the width of the groove 34 should be close to the diameter of the elastic hose 10, preferably the width of the groove 34 should be equal to the diameter of the elastic hose 10; at least one extrusion wheel 2 and reset wheel 3 are provided on the extrusion assembly 200, and the axes of the extrusion wheel 2 and the reset wheel 3 are located on the same circle. When multiple extrusion wheels 2 and reset wheels 3 are provided, they should be spaced apart from each other so that reset after extrusion can be more timely; in this embodiment, the scheme adopted is 2 extrusion wheels 2 and 2 reset wheels 3.

[0048] like Figures 7 and 8In order to enable the present application to adapt to elastic hoses 10 of different diameters, in a preferred embodiment, the reset wheel 3 has an adjustment device capable of adjusting the width of the groove 34; specifically, the reset wheel 3 includes a fixed shaft 31, one end of the fixed shaft 31 is fixedly provided with a fixed wheel 32, and the other end of the fixed shaft 31 is fixedly provided with an adjustment wheel 33, so that the rotating shaft can drive the fixed wheel 32 and the adjustment wheel 33 to rotate. For the convenience of operation, the adjustment wheel 33 is preferably located on the side away from the base 5. The adjustment wheel 33 includes a cylindrical outer cover 331 and a slide post 332. The slide post 332 is inserted into the outer cover 331 and a spring 335 is pressed between the slide post 332 and the outer cover 331, so that the slide post 332 can move along the adjustment wheel 3 The outer cover 331 and the sliding column 332 are both mounted on the fixed shaft 31 and the outer cover 331 is located at the outer end of the fixed shaft 31. The outer cover 331 and the fixed shaft 31 are fixedly arranged so as not to rotate relative to each other. The sliding column 332 and the fixed shaft 31 are clearance-matched so that they can slide on the fixed shaft 31. In this way, the elastic expansion and contraction of the sliding column 332 can adjust the width of the groove 34. When the width is adjusted to the specified width, in order to fix the sliding column 332, a threaded hole 336 is provided on the side wall of the outer cover 331 and a top screw 333 is adapted therein. A top screw groove 334 is provided on the outer wall of the sliding column 332. When the top screw 333 is pressed against the inner wall of the top screw groove 334, the slider cannot slide.

[0049] like Figures 9 and 10In order to facilitate the installation of the elastic hose 10, in a preferred embodiment, the housing 100 includes a base 5, a motor 4 is fixed to the rear side of the base 5, the rotating shaft of the motor 4 passes through the base 5 and is fixedly connected to the extrusion assembly 200, and the extrusion assembly 200 is located at the front side of the base 5, the axes of the extrusion wheel 2 and the reset wheel 3 are located on the same circle, the axis of the rotating shaft of the motor 4 is perpendicular to the circular surface and passes through the center of the circle, the upper slider 6 and the lower slider both have the arc-shaped bearing surface 62, the upper slider 6 and the lower slider are symmetrically arranged at the upper and lower parts of the base 5, respectively, and the upper slider 6 and the lower slider form the The upper slider 6 and the lower slider can both slide up and down in the vertical direction. Specifically, the upper slider 6 and the lower slider are provided with a sliding rail 61 which is wide at the top and narrow at the bottom on the surfaces that fit with the base 5. The base 5 is provided with a sliding groove 51 which is wide at the bottom and narrow at the top and matches with the sliding rail 61, so that the upper slider 6 and the lower slider cannot be separated when sliding on the base 5 and keep in close contact. The base 5 is provided with a blocking edge 53 which can be respectively matched with the upper slider 6 and the lower slider, and is used to limit the sliding of the upper slider 6 and the lower slider. When the upper slider 6 and the lower slider slide to their respective corresponding blocking edges 53, the upper slider 6 and the lower slider are A receiving cavity 101 is formed between the blocks, and a channel 102 of the shell 100 is extended to the left and right sides respectively through which the elastic hose 10 is laid; when the upper slider 6 and the lower slider slide into place, it is necessary to fix the upper slider 6 and the lower slider to the base 5, and any structure that can achieve the fixing effect is acceptable; the structure adopted in this example is that both the upper slider 6 and the lower slider are provided with a card block 8 hole, and the base 5 is provided with a card block 8 hole corresponding thereto, and when the upper slider 6 and the lower slider slide to the working position, the card block 8 is inserted into the card block 8 hole to fix the upper slider 6 and the lower slider to the base 5; the elastic soft The tube 10 extends out of the channel 102 of the shell 100 to the left and right sides respectively, and is also provided with a card slot 54. The two ends of the elastic hose 10 in the prior art are plugged with hard connectors 11, and the two ends of the elastic hose 10 are fixedly carded in the card slot 54 by the clip 9. The card structure of this part is the prior art, and the existing peristaltic pump has this card structure, which will not be described in detail here; in order to separate the accommodating cavity from the outside, a protective cover 12 is also fixed on the base 5, and the protective cover 12 is located in front of the extrusion assembly 200, shielding the extrusion assembly 200 in the accommodating cavity 101.

[0050] The use process of the present application is as follows: when it is necessary to use one channel 102, it is only necessary to slide up or down to open any upper slider 6 or lower slider, lay the elastic hose 10 on the groove 34 of the reset wheel 3 and the surface of the extrusion wheel 2, and then close the corresponding upper slider 6 or lower slider, insert the card block 8 and the clip 9 of the elastic hose 10 to fix it; when running for a long time, in order to prevent one side of the elastic hose 10 from being worn too seriously, it is only necessary to open the upper slider 6 and the lower slider, without removing the clips 9 at both ends of the hose, and directly put the elastic hose 10 on the other channel opposite to it, so that the extrusion surface of the elastic hose 10 becomes the other side, and the upper slider 6 and the lower slider are closed and fixed, and the motor 4 is controlled to reverse by the controller, so that the work can continue; when it is necessary to use two channels 102 for multiple purposes with one machine, both the upper slider 6 and the lower slider are opened, and two elastic hoses 10 are laid, and then the upper slider 6 and the lower slider are closed and fixed.

[0051] The beneficial effects of the peristaltic device of the infusion pump provided by the embodiment of the present invention are:

[0052] By setting a reset wheel 3 on the extrusion assembly 200, the reset wheel 3 is provided with a circle of grooves 34, and the hose is laid in the grooves 34. After the hose is squeezed, the two side walls of the grooves 34 will assist the hose to rebound and reset, instead of relying solely on the hose's own resilience, which greatly reduces the loss of the hose's resilience, ensures the stability of the delivery accuracy, and extends the service life of the hose; the reset wheel 3 has an adjustment device that can adjust the width of the groove 34, so that the peristaltic pump of the present application can adapt to flexible hoses of different diameters; the extrusion assembly 200 of the peristaltic device provided by the present invention and the two bearing surfaces 62 respectively form two symmetrical channels 102 for laying the elastic hose 10, firstly, a set of rotating mechanisms can be realized to realize the delivery of the two channels 102, so that one machine can be used for two purposes; secondly, the upper slider 6 and the lower slider are set in the sliding structure of the base 5, which is very convenient when installing the hose, and the hose only needs to be laid on the extrusion assembly 200, and then the slider is reset and fixed.

[0053] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A peristaltic device for an infusion pump, comprising a housing and an extrusion assembly, wherein the extrusion assembly is rotatably mounted in the housing, and a channel for laying an elastic hose is provided between the extrusion assembly and the housing, wherein: The shell is provided with a receiving cavity for installing the extrusion assembly which is symmetrical in upper and lower parts. The side wall of the receiving cavity has two arc-shaped bearing surfaces which are symmetrical in upper and lower parts for extruding the elastic hose, and the two arc-shaped bearing surfaces are both located on a circle. Two upper and lower channels for laying the elastic hose are respectively formed between the extrusion assembly and the two bearing surfaces. The outer edge of the extrusion assembly is provided with an extrusion wheel for extruding the elastic hose and a reset wheel for assisting the elastic hose to rebound. The side wall of the reset wheel is provided with a circle of grooves for accommodating the elastic hose. The rotation of the extrusion assembly can drive the extrusion wheel and the reset wheel to roll along the arc-shaped bearing surface. When the extrusion wheel squeezes the elastic hose, the The two side walls of the reset wheel groove assist the elastic hose to rebound and restore; the reset wheel has an adjustment device that can adjust the width of the groove; the reset wheel includes a fixed shaft, one end of the fixed shaft is fixedly provided with a fixed wheel, and the other end of the fixed shaft is fixedly provided with an adjustment wheel; the adjustment wheel includes a cylindrical outer cover and a sliding column, the sliding column is inserted into the outer cover and a spring is pressed between the sliding column and the outer cover, so that the sliding column can elastically expand and contract along the adjustment axis direction; the outer cover and the sliding column are both mounted on the fixed shaft, the outer cover and the fixed shaft are fixedly arranged, and the sliding column can slide on the fixed shaft; a top screw is provided on the side wall of the outer cover, and when the top screw is pressed against the side wall of the sliding column, the slider can be prevented from sliding.

2. The peristaltic device of the infusion pump according to claim 1, characterized in that: At least one extrusion wheel and one reset wheel are provided, and the axes of the extrusion wheel and the reset wheel are located on the same circle.

3. The peristaltic device of the infusion pump according to claim 1, characterized in that: The diameter of the groove is equal to the diameter of the elastic hose.

4. The peristaltic device of the infusion pump according to claim 1, characterized in that: The shell includes: a base, a motor is fixed to the rear side of the base, the rotating shaft of the motor is connected to the extrusion assembly and the extrusion assembly is located at the front side of the base; an upper slider and a lower slider are symmetrically arranged at the upper and lower parts of the base respectively, and the accommodating cavity is formed between the upper slider and the lower slider; the upper slider and the lower slider can both slide up and down in the vertical direction.

5. The peristaltic device of the infusion pump according to claim 4, characterized in that: The upper slider and the lower slider both have the arc-shaped bearing surface.

6. The peristaltic device of the infusion pump according to claim 4, characterized in that: The base is provided with a blocking edge which can be respectively docked and matched with the upper slider and the lower slider, and is used for limiting the sliding position of the upper slider and the lower slider.

7. The peristaltic device of an infusion pump according to claim 4, characterized in that: The surfaces of the upper and lower sliders that fit the base are both provided with sliding rails that are wide at the top and narrow at the bottom, and the base is provided with sliding grooves that match the sliding rails, so that the upper and lower sliders cannot separate when sliding on the base and maintain a tight fit.

8. The peristaltic device of an infusion pump according to claim 4, characterized in that: The upper slider and the lower slider are both provided with block holes, and the base is provided with block holes corresponding thereto. When the upper slider and the lower slider slide to the working position, blocks are inserted into the block holes to fix the upper slider and the lower slider to the base.

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