Peristaltic pump

Abstract

The invention discloses a peristaltic pump, and relates to the technical field of peristaltic pumps, a limiting block is elastically and slidably assembled in a pump chamber, and the sliding direction is parallel to a rotating shaft of a pump head assembly; the height of the limiting block is gradually and smoothly increased in the forward rotation direction, and the width of the limiting block is gradually and smoothly increased in the reverse rotation direction. The pump head assembly is rotatably assembled to the pump chamber assembly, when the pump head assembly rotates forwards, the limiting shaft right faces the lower end of the limiting block, the limiting shaft extrudes the limiting block downwards, and at the moment, the extrusion roller extrudes the hose to achieve the pumping process; when the hose needs to be replaced, the pump head assembly rotates reversely, the limiting shaft makes contact with the inner side of the narrow end of the limiting block, and the limiting shaft extrudes the roller support to rotate inwards, so that the extrusion roller is far away from the inner wall of the pump chamber, the distance between the inner wall of the pump chamber and the extrusion roller is increased, a larger gap is formed, and the hose is rapidly replaced. The gap can be increased only by changing the rotating direction of the pump head assembly, and the hose replacement process is greatly facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of peristaltic pumps, and further to a peristaltic pump. Background Art

[0002] Blood purification refers to drawing the patient's blood out of the body and passing it through some kind of blood purification equipment to remove certain pathogenic substances (toxins) and water in it to purify the blood. Blood purification includes hemodialysis, hemofiltration, hemoperfusion, blood exchange, immunoadsorption, etc.

[0003] With the improvement of medical level, blood purification treatment methods have gradually become diversified and specialized. Different treatment methods are used to deal with different diseases, making blood purification technology balanced in terms of treatment effect, indications, economic feasibility, etc. Peristaltic pumps are extremely important independent units in blood purification equipment. At present, peristaltic pump technology is applied to blood pumps, dialysate pumps, replacement fluid pumps, waste fluid pumps, citrate pumps, calcium pumps and other units in blood purification equipment on the market.

[0004] Peristaltic pumps are usually composed of a drive motor, an extrusion pump head and a hose. They pump fluids by alternately squeezing and releasing the pump's elastic delivery hose. Peristaltic pumps are extremely important independent units in blood purification equipment to ensure the smooth conduct of extracorporeal circulation.

[0005] Before each blood purification treatment, medical staff need to replace new tubing consumables for the patient. Therefore, under the premise of frequent replacement of pump tubes, quick and convenient installation of the tubing becomes particularly important.

[0006] For technicians in this field, how to quickly and conveniently replace the pipeline of a peristaltic pump is a technical problem that needs to be solved at present. Summary of the invention

[0007] The core of the present invention is to provide a peristaltic pump. When replacing a hose, it is only necessary to rotate the pump assembly in the opposite direction to release the squeezing of the hose, increase the gap and realize rapid replacement of the pipeline. The specific scheme is as follows:

[0008] A peristaltic pump comprises a pump chamber assembly and a pump head assembly, wherein the pump head assembly can be rotatably assembled on the pump chamber assembly;

[0009] The pump chamber assembly comprises a pump chamber, a pump cover and a stop block; the inner cavity of the pump chamber is provided with a cylindrical surface which is equidistant from the pump head assembly; the stop block is elastically slidably assembled in the pump chamber, and the sliding direction is parallel to the rotation axis of the pump head assembly; the height of the stop block gradually and smoothly increases along the forward direction, and the width of the stop block gradually and smoothly increases along the reverse direction;

[0010] The pump head assembly comprises a pump head base, a roller bracket, an extrusion roller, a limiting shaft, and an elastic member; the first end of the roller bracket is hinged to the pump head base, and the extrusion roller is rotatably connected to the second end of the roller bracket; the limiting shaft is arranged on the roller bracket; the elastic member is arranged between the pump head base and the roller bracket, and the elastic member applies an outward elastic force to the roller bracket, so that the extrusion roller is close to the inner wall of the pump chamber to cooperate with the extrusion hose;

[0011] Among them, when the pump head assembly rotates forward, the limit shaft is opposite to the lower end of the limit block, and the limit shaft squeezes the limit block downward; when the pump head assembly is reversed, the limit shaft contacts the inner side of the narrow end of the limit block, and the limit shaft squeezes the roller bracket to rotate inward, thereby increasing the distance between the inner wall of the pump chamber and the extrusion roller.

[0012] Optionally, a guide block is arranged on the outer side of the roller bracket; in the direction of the rotation axis of the pump head assembly, the displacement range of the hose is limited by the guide block.

[0013] Optionally, the pump head base includes an outer limit block, and the elastic member applies an outward elastic force to the roller bracket so that the roller bracket is pressed onto the outer limit block.

[0014] Optionally, the pump head base comprises an upper base, a lower base and a connecting block, and the upper base and the lower base are fixedly connected by the connecting block; a groove for mounting the elastic member is provided on the connecting block;

[0015] The lower base is provided with an avoidance notch for avoiding the limit axis, and the avoidance notch is used to limit the limit position of the roller bracket moving inward;

[0016] The upper base is provided with a screwing block for screwing.

[0017] Optionally, a buffer pad is provided at the contact surface between the limit block and the pump chamber.

[0018] Optionally, the squeezing roller is mounted on the limiting shaft;

[0019] The squeezing roller is fixed relative to the limiting shaft, or the squeezing roller and the limiting shaft are relatively fixed and rotate relative to the roller bracket.

[0020] Optionally, a Hall position sensor is provided in the pump chamber to sense the position signal of the limit shaft and determine whether the pump head assembly is reversed and in place.

[0021] Optionally, a door magnet and a magnetic block are provided between the pump chamber and the pump cover to achieve magnetic attraction;

[0022] The pump chamber or the pump cover is provided with a Hall-effect cover opening sensor for sensing the opening and closing state of the pump cover.

[0023] Optionally, at least two limit blocks are provided;

[0024] At least three roller brackets are provided;

[0025] The number of the Hall position sensors is equal to the number of the roller brackets.

[0026] Optionally, two pipeline gaps for clamping the hose are arranged on the pump chamber, and the pipeline gaps are narrow at the top and wide at the bottom.

[0027] The present invention provides a peristaltic pump, wherein a limit block is elastically slidably assembled in a pump chamber, and the sliding direction is parallel to the rotation axis of a pump head assembly; the height of the limit block gradually and smoothly increases along the forward direction, and the width of the limit block gradually and smoothly increases along the reverse direction; the pump head assembly can be rotatably assembled in the pump chamber assembly, and when the pump head assembly rotates forward, the limit shaft is directly opposite to the lower end of the limit block, and the limit shaft squeezes the limit block downward, at which time the extrusion roller squeezes the hose to realize the pumping process; when the hose needs to be replaced, the pump head assembly is reversed, the limit shaft contacts the inner side of the narrow end of the limit block, and the limit shaft extrusion roller bracket rotates inward, so that the extrusion roller is away from the inner wall of the pump chamber, the distance between the inner wall of the pump chamber and the extrusion roller is increased, and a larger gap is formed to realize the rapid replacement of the hose. The present invention only needs to increase the gap by changing the rotation direction of the pump head assembly, which greatly facilitates the hose replacement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 An axonometric diagram of an embodiment of a peristaltic pump of the present invention;

[0030] Figure 2 for Figure 1 Cross-section view in the AA direction;

[0031] Figure 3 for Figure 1 Cross-section along the middle BB direction;

[0032] Figure 4 for Figure 3 Cross-sectional view in the mid-CC direction;

[0033] Figure 5Axonometric view of the pump chamber assembly with the pump cover removed;

[0034] Figure 6 for Figure 5 Axonometric drawing from another perspective;

[0035] Figure 7 It is a schematic diagram of the limit block extending upward;

[0036] Figure 8 It is a schematic diagram of the limit block in the state of retracting downward;

[0037] Fig. 9 This is a sectional axonometric view of one of the limit blocks of the pump chamber;

[0038] Fig.10 An axonometric view of the peristaltic pump of the present invention with the pump chamber and pump cover removed;

[0039] Fig.11 It is a schematic diagram of the pump head assembly cooperating with two limit blocks when it is reversed;

[0040] Fig.12 for Fig.11 A front view of

[0041] Fig.13 for Fig.12 Cross-section in the middle DD direction;

[0042] Fig.14 An axonometric view of an embodiment of a pump head base;

[0043] Fig.15 This is the axonometric view of the lower end of the limit block;

[0044] Fig.16 This is an axonometric view of the narrow end of the limit block.

[0045] The figure includes:

[0046] Pump chamber assembly 1, pump chamber 11, pipeline notch 111, pump cover 12, limit block 13, buffer pad 131, lifting spring 132, Hall position sensor 14, Hall cover opening sensor 15, driver 16;

[0047] Pump head assembly 2, pump head base 21, upper base 211, twisting block 2111, lower base 212, avoidance gap 2121, connecting block 213, outer limit block 214, roller bracket 22, extrusion roller 23, limit shaft 24, elastic member 25, guide block 26;

[0048] Hose 3. DETAILED DESCRIPTION

[0049] The core of the present invention is to provide a peristaltic pump. When replacing a hose, it is only necessary to rotate the pump assembly in the opposite direction to release the squeezing of the hose, increase the gap and realize rapid replacement of the pipeline.

[0050] In order to enable those skilled in the art to better understand the technical solution of the present invention, the peristaltic pump of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. The directions referred to herein are described in accordance with the directions shown in the accompanying drawings.

[0051] The present invention provides a peristaltic pump, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it includes a pump chamber assembly 1 and a pump head assembly 2. The pump chamber assembly 1 is a fixed structure. When in use, the pump chamber assembly 1 remains fixed, and structures such as the pump head assembly 2 can be installed in the pump chamber assembly 1. The pump head assembly 2 can be rotatably assembled on the pump chamber assembly 1, and when in use, the pump head assembly 2 can rotate around an axis. In the structure shown in the accompanying drawings of the present invention, the rotation of the pump head assembly 2 around a vertical axis is taken as an example, which does not mean that the pump head assembly 2 can only rotate around a vertical axis, but can also rotate around a horizontal axis, or adopt other setting directions, and the pumping effect can also be achieved. For the convenience of explanation, the present invention is shown as follows. Figure 1 An introduction to the directions shown.

[0052] The pump chamber assembly 1 includes a pump chamber 11, a pump cover 12 and a stopper 13; wherein the pump chamber 11 and the pump cover 12 cooperate with each other to form an internal hollow chamber, and the pump cover 12 can be opened or closed relative to the pump chamber 11, and the pump cover 12 remains in a closed state during operation. The pump cover 12 can be opened by rotation, or can be directly removed from the pump chamber 11.

[0053] Combination Figure 4 As shown, the cross-sectional structure of the peristaltic pump is shown, the inner cavity of the pump chamber 11 is provided with a cylindrical surface equidistant from the pump head assembly 2, and a part of the inner cavity of the pump chamber 11 is a cylindrical surface ( Figure 4 The upper part) is used to cooperate with the pump head assembly 2, and the other parts do not need to be set as cylindrical surfaces ( Figure 4 the lower part).

[0054] The limit block 13 is elastically slidably assembled in the pump chamber 11, and the sliding direction is parallel to the rotation axis of the pump head assembly 2. Figure 7 , Figure 8 , Fig. 9As shown, the limit block 13 is slidably assembled on the bottom plate of the pump chamber 11, and a groove is provided below the limit block 13 for accommodating a lifting spring 132. The lifting spring 132 can exert an upward elastic force on the limit block 13, so that the limit block 13 has a tendency to extend upward. When there is no external force, the top of the limit block 13 can protrude upward from the bottom plate of the pump chamber 11 to form a convex block protruding from the bottom plate of the pump chamber 11. The limit block 13 can only slide along a straight line and cannot rotate. When the limit block 13 is subjected to a downward extrusion force, the limit block 13 can retract downward until the top of the limit block 13 is flush with the upper surface of the bottom plate of the pump chamber 11.

[0055] Combination Fig.15 , Fig.16 As shown, the height of the limit block 13 increases gradually and smoothly in the forward direction, and the width of the limit block 13 increases gradually and smoothly in the reverse direction. The forward and reverse directions mentioned here refer to the rotation direction of the pump head assembly 2, and the limit block 13 itself does not rotate. The entire limit block 13 has two dimensional characteristics, with changes in height and width. The height of the limit block 13 increases gradually in the forward direction, and the width decreases gradually in the forward direction; the width increases gradually in the reverse direction, and the height decreases gradually in the reverse direction. The outer surface of the limit block 13 can be a plane or a curved surface. Fig.15 , Fig.16 The upper surface of the stopper 13 is a structure of a section of inclined surface and a section of horizontal surface. The two side surfaces of the stopper 13 that form a width change are curved surfaces. The corresponding curved surfaces and planes in the figure can be replaced with each other, and are not limited to this, as long as the height change and width change can be achieved. The height change of the stopper 13 is reflected in the change of the shape of the upper surface. The upper surface of the stopper 13 is a guide surface that can be in contact with the stopper shaft 24, and the stopper shaft 24 can move relative to the upper surface of the stopper 13. The width change of the stopper 13 makes its narrower end have a wedge-shaped structure.

[0056] Combination Fig.15 , Fig.16 As shown, the lower area of ​​the stop block 13 is set as a flat plate structure, and the above-mentioned width size change refers to the upper area of ​​the stop block 13, and it is not required that all of them form a wedge shape. The cross-sectional area of ​​the lower flat plate structure of the stop block 13 is larger than the area where the upper width changes, and the lower flat plate structure contacts the bottom plate of the pump chamber 11, which can limit the highest position of the stop block 13 moving upward.

[0057] Combination Fig.10 , Fig.11As shown, the pump head assembly 2 includes a pump head base 21, a roller bracket 22, an extruding roller 23, a limiting shaft 24, an elastic member 25 and other structures. At least two roller brackets 22 are hinged to the pump head base 21, and the roller brackets 22 can swing around the rotation axis relative to the pump head base 21, and the rotation axis of the roller brackets 22 relative to the pump head base 21 is parallel to the rotation axis of the pump head base 21 itself.

[0058] The first end of the roller bracket 22 is hinged to the pump head base 21, and the extrusion roller 23 is rotatably connected to the second end of the roller bracket 22. The extrusion roller 23 can rotate relative to the roller bracket 22. The rotation axis of the extrusion roller 23 and the roller bracket 22, the rotation axis of the roller bracket 22 relative to the pump head base 21, and the rotation axis of the pump head base 21 itself are parallel to each other. The extrusion roller 23 is cylindrical or elliptical, and is combined with Figure 4 As shown, a portion of the outer circumferential surface of the extrusion roller 23 protrudes from the roller bracket 22, and the outer surface of the extrusion roller 23 can directly contact the extrusion hose 3 to achieve extrusion; the pump head base 21 rotates itself as a revolution, driving the roller bracket 22 and the extrusion roller 23 to perform a synchronous revolution. During normal use, the roller bracket 22 basically does not rotate relative to the pump head base 21 or rotates slightly, and the extrusion roller 23 contacts the hose 3 and performs a rotational motion relative to the roller bracket 22. The extrusion roller 23 and the hose 3 go from contact to separation, squeezing a section of the hose 3 to make the liquid inside the hose 3 flow; during the rotation of the pump head base 21, the extrusion rollers 23 set on each roller bracket 22 will alternately pull and press the hose 3, so that the hose 3 can achieve a pumping effect.

[0059] Combination Figure 1 , Figure 2 , Figure 3 As shown, a driver 16 is installed at the lower part of the pump chamber assembly 1. The driver 16 can be a motor. The output shaft of the driver 16 is connected to the pump head base 21, which can drive the pump head assembly 2 to rotate, and can realize the forward or reverse rotation of the pump head assembly 2.

[0060] Combination Fig.13 As shown, the elastic member 25 is arranged between the pump head base 21 and the roller bracket 22. The elastic member 25 applies an outward elastic force to the roller bracket 22. The elastic force of the elastic member 25 can make the roller bracket 22 move away from the pump head base 21, so that the extrusion roller 23 is close to the inner wall of the pump chamber 11. The extrusion roller 23 and the inner wall of the pump chamber 11 cooperate to extrude the hose 3.

[0061] Combination Fig.11 As shown, the limiting shaft 24 is arranged on the roller bracket 22, and the limiting shaft 24 cannot move relative to the roller bracket 22. The limiting shaft 24 can be fixed to the roller bracket 22, or the limiting shaft 24 itself is cylindrical and hinged to the roller bracket 22 so that the limiting shaft 24 can rotate relative to the roller bracket 22.

[0062] The limit shaft 24 is used in conjunction with the limit block 13. The lower end of the limit block 13 is wider and the narrow end is higher. When the pump head assembly 2 rotates forward, the limit shaft 24 faces the lower end of the limit block 13. Since the position of the limit shaft 24 is fixed, the bottom end of the limit shaft 24 applies a downward force to the limit block 13. The limit shaft 24 squeezes the limit block 13 downward, which can make the limit block 13 retract downward until the limit shaft 24 completely passes over the limit block 13 and then rebounds upward again. Figure 8 The state in which the stopper 13 is compressed downward is shown. In the forward rotation process, the distance between the squeezing roller 23 and the inner wall of the pump chamber 11 is smaller than the diameter of the hose 3, so that the squeezing pump liquid can be realized.

[0063] Combination Fig.11 As shown, when the pump head assembly 2 is reversed, the limit shaft 24 contacts the inner surface of the narrow end of the limit block 13. At this time, the limit block 13 is not subjected to downward pressure. The limit block 13 applies a rotational force to the limit shaft 24, and the limit shaft 24 squeezes the roller bracket 22 to rotate inward, which also causes the squeezing roller 23 to be closer to the rotating shaft of the pump head base 21, thereby increasing the distance between the inner wall of the pump chamber 11 and the squeezing roller 23. During the reversal process, the distance between the squeezing roller 23 and the inner wall of the pump chamber 11 is greater than the diameter of the hose 3, and the hose 3 is relieved of the constraint.

[0064] It should be noted that the above-mentioned forward rotation and reverse rotation are two different directions. From a top view, if the forward rotation is clockwise, the reverse rotation is counterclockwise; when the installation position of the roller bracket 22 and the limit block 13 is changed, the forward rotation can also be counterclockwise and the reverse rotation can be clockwise.

[0065] The peristaltic pump of the present invention can achieve normal pumping of liquid when the pump head assembly 2 rotates forward through the mutual cooperation between the limit shaft 24 and the limit block 13. When replacing the hose 3, it is only necessary to change the rotation direction of the pump head assembly 2. The gap between the extrusion roller 23 and the inner wall of the pump chamber 11 can be increased by only changing the rotation direction of the pump head assembly 2. The hose 3 is no longer squeezed, which greatly facilitates the replacement process of the hose 3.

[0066] Based on the above scheme, combined with Fig.10 , Fig.11 , Fig.12As shown, a guide block 26 is arranged on the outer side of the roller bracket 22, that is, the guide block 26 is arranged on the surface of the roller bracket 22 away from the axial direction of the pump head base 21. Two guide blocks 26 are arranged on one roller bracket 22, and the two guide blocks 26 cooperate to limit the position of the hose 3. In the direction of the rotation axis of the pump head assembly 2, the hose 3 is limited in displacement range by the guide blocks 26, that is, the hose 3 can only move up and down in the range between the two guide blocks 26. The distance between the two guide blocks 26 is greater than the diameter of the hose 3. Through the limitation of the guide blocks 26, the hose 3 can be directly opposite to the extrusion roller 23.

[0067] Combination Fig.10 , Fig.11 As shown, the pump head base 21 includes an outer limit block 214, which is fixedly mounted on the pump head base 21, and limits the extreme position of the roller bracket 22 to swing outward; the elastic member 25 applies an outward elastic force to the roller bracket 22, and the roller bracket 22 moves away from the rotating axis of the pump head base 21, so that the roller bracket 22 is pressed on the outer limit block 214, which can limit the gap size between the extrusion roller 23 and the inner wall of the pump chamber 11 during normal pumping.

[0068] Combination Fig.14 As shown, the structure of the pump head base 21 is shown. The pump head base 21 includes an upper base 211, a lower base 212 and a connecting block 213. The upper base 211 and the lower base 212 are fixedly connected by the connecting block 213 to form a whole. The connecting block 213 is provided with a groove for installing the elastic member 25. An elastic member 25 can be installed in each groove. The elastic member 25 can be a spring; according to the number of roller brackets 22, the connecting block 213 can have different shapes. The connecting block 213 is provided with a number of planes equal to the number of roller brackets 22. An avoidance notch 2121 for avoiding the limit shaft 24 is provided on the lower base 212. The avoidance notch 2121 is used to limit the limit position of the inward movement of the roller bracket 22, combined with Fig.11 As shown, when the pump head base 21 is reversed, the limit block 13 pushes the limit shaft 24 to move inward, so that the end of the roller bracket 22 equipped with the extrusion roller 23 is close to the rotating shaft of the pump head base 21; at this time, the limit shaft 24 enters the avoidance gap 2121, and the avoidance gap 2121 provides an avoidance space for the limit shaft 24, and the bottom end of the groove of the avoidance gap 2121 can limit the extreme position of the limit shaft 24.

[0069] Combination Fig.11 As shown, the upper base 211 is provided with a twisting block 2111 for twisting, and the twisting block 2111 protrudes upward from the upper surface of the upper base 211, and can be pinched by fingers to drive the upper base 211 to rotate, which is convenient for use during assembly. For example, when reversing, the driver 16 can be stopped, and the operator can manually operate the pump head base 21 to rotate in the opposite direction.

[0070] Combination Fig. 9 , Fig.12 As shown, a buffer pad 131 is provided at the contact surface between the limit block 13 and the pump chamber 11 . The buffer pad 131 can be made of rubber, silicone or other materials, and can reduce the noise generated by the limit block 13 colliding with the pump chamber 11 when it rebounds upward.

[0071] Combination Fig.11 As shown, the squeezing roller 23 is mounted on the limiting shaft 24; the squeezing roller 23 is fixed relative to the limiting shaft 24, or the squeezing roller 23 and the limiting shaft 24 are relatively fixed and rotate relative to the roller bracket 22. There are two cases, the limiting shaft 24 is fixed to the roller bracket 22, and the squeezing roller 23 rotates relative to the limiting shaft 24; or the squeezing roller 23 and the limiting shaft 24 are relatively fixed, the limiting shaft 24 and the squeezing roller 23 rotate synchronously, and can rotate relative to the roller bracket 22.

[0072] Based on any of the above technical solutions and their combination, Figure 2 , Fig.12 As shown, the pump chamber 11 of the present invention is provided with a Hall position sensor 14, which is used to sense the position signal of the limit shaft 24 and determine the reverse position state of the pump head assembly 2. For example, when the driver 16 is used to drive the pump head assembly 2 to reverse, the position signal of the limit shaft 24 can be sensed by the Hall position sensor 14, and when the Hall position sensor 14 senses that the limit shaft 24 has reached the specified position, the driver 16 is stopped.

[0073] A door magnet and a magnetic block are provided between the pump chamber 11 and the pump cover 12. One of the pump chamber 11 and the pump cover 12 is provided with a magnet and the other is provided with a magnetic block, so as to realize magnetic attraction and ensure the tightness of the pump chamber 11 and the pump cover 12 when they are closed.

[0074] The pump chamber 11 or the pump cover 12 is provided with a Hall-effect cover opening sensor 15 for sensing the opening and closing state of the pump cover 12. When the Hall-effect cover opening sensor 15 detects that the pump cover 12 is opened, the driver 16 can be forcibly stopped to avoid harming the operator.

[0075] At least two limit blocks 13 are provided, combined with Figure 6 , Fig. 9 As shown, two limit blocks 13 are provided on the pump chamber 11 to ensure that the two squeezing rollers 23 are kept away from the inner wall of the pump chamber 11 during reversal.

[0076] At least three roller brackets 22 are provided, and thus at least three squeezing rollers 23 are provided, so as to squeeze the hose 3 alternately to ensure continuous pumping of the liquid.

[0077] The number of the Hall position sensors 14 is equal to the number of the roller brackets 22. Figure 6 , Fig. 9As shown, three Hall position sensors 14 are provided, and the number of the Hall position sensors 14 is equal to the number of the roller brackets 22 .

[0078] Combination Figure 5 As shown, two pipe notches 111 for clamping the hose 3 are provided on the pump chamber 11. The pipe notches 111 are narrow at the top and wide at the bottom. The hose 3 can be clamped into the pipe notches 111 from top to bottom. The width of the narrower part of the upper part of the pipe notch 111 is smaller than the diameter of the hose 3, and the wider part of the lower part is slightly larger than the diameter of the hose 3.

[0079] The present invention provides a peristaltic pump, which is used for but not limited to blood purification equipment, and utilizes the reverse rotation of the driver 16 to achieve the contraction of the squeezing roller 23 of the peristaltic pump head assembly 2, increase the gap between the squeezing roller 23 and the inner wall of the pump chamber 11, and realize the convenient disassembly and assembly of the hose 3.

[0080] The linkage design of the pump head assembly 2 and the pump chamber 11 of the present invention cleverly uses the ratchet mechanism concept, which can realize the contraction of the extrusion roller 23 of the peristaltic pump head assembly 2 without increasing the power source, increase the gap between the extrusion roller 23 and the inner wall of the pump chamber 11, and realize convenient disassembly and assembly of the pipeline. It has a simple structure and few parts, which reduces the production and manufacturing costs and reduces the manpower and time costs of medical staff.

[0081] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A peristaltic pump, characterized in that: It comprises a pump chamber assembly (1) and a pump head assembly (2), wherein the pump head assembly (2) can be rotatably assembled on the pump chamber assembly (1); The pump chamber assembly (1) comprises a pump chamber (11), a pump cover (12) and a stop block (13); the inner cavity of the pump chamber (11) is provided with a cylindrical surface which is equidistant from the pump head assembly (2); the stop block (13) is elastically slidably assembled in the pump chamber (11), and the sliding direction is parallel to the rotation axis of the pump head assembly (2); the height of the stop block (13) increases gradually and smoothly along the forward direction, and the width of the stop block (13) increases gradually and smoothly along the reverse direction; The pump head assembly (2) comprises a pump head base (21), a roller bracket (22), an extrusion roller (23), a limiting shaft (24), and an elastic member (25); a first end of the roller bracket (22) is hinged to the pump head base (21), and the extrusion roller (23) is rotatably connected to the second end of the roller bracket (22); the limiting shaft (24) is arranged on the roller bracket (22); the elastic member (25) is arranged between the pump head base (21) and the roller bracket (22), and the elastic member (25) applies an outward elastic force to the roller bracket (22), so that the extrusion roller (23) is close to the inner wall of the pump chamber (11) so as to cooperate with the extrusion hose (3); When the pump head assembly (2) rotates forward, the limit shaft (24) faces the lower end of the limit block (13), and the limit shaft (24) squeezes the limit block (13) downward; when the pump head assembly (2) rotates reversely, the limit shaft (24) contacts the inner side of the narrow end of the limit block (13), and the limit shaft (24) squeezes the roller bracket (22) to rotate inward, thereby increasing the distance between the inner wall of the pump chamber (11) and the squeezing roller (23).

2. The peristaltic pump according to claim 1, characterized in that: A guide block (26) is arranged on the outer side of the roller bracket (22); in the direction of the rotation axis of the pump head assembly (2), the displacement range of the hose (3) is limited by the guide block (26).

3. The peristaltic pump according to claim 1, characterized in that: The pump head base (21) comprises an outer limit block (214), and the elastic member (25) applies an outward elastic force to the roller bracket (22), so that the roller bracket (22) is pressed onto the outer limit block (214).

4. The peristaltic pump according to claim 1, characterized in that: The pump head base (21) comprises an upper base (211), a lower base (212) and a connecting block (213); the upper base (211) and the lower base (212) are fixedly connected via the connecting block (213); a groove for mounting the elastic member (25) is provided on the connecting block (213); The lower base (212) is provided with an avoidance notch (2121) for avoiding the limit shaft (24), and the avoidance notch (2121) is used to limit the limit position of the inward movement of the roller bracket (22); The upper base (211) is provided with a twisting block (2111) for twisting.

5. The peristaltic pump according to claim 1, characterized in that: A buffer pad (131) is provided at the contact surface between the limit block (13) and the pump chamber (11).

6. The peristaltic pump according to claim 1, characterized in that: The squeezing roller (23) is mounted on the limiting shaft (24); The squeezing roller (23) is fixed relative to the limiting shaft (24), or the squeezing roller (23) and the limiting shaft (24) are fixed relative to each other and rotate relative to the roller bracket (22).

7. The peristaltic pump according to any one of claims 1 to 6, characterized in that: The pump chamber (11) is provided with a Hall position sensor (14) for sensing a position signal of the limit shaft (24) and determining whether the pump head assembly (2) is in reverse position.

8. The peristaltic pump according to claim 7, characterized in that: A door magnet and a magnetic attraction block are provided between the pump chamber (11) and the pump cover (12) for achieving magnetic attraction; The pump chamber (11) or the pump cover (12) is provided with a Hall-effect cover opening sensor (15) for sensing the opening and closing state of the pump cover (12).

9. The peristaltic pump according to claim 7, characterized in that: At least two limit blocks (13) are provided; At least three roller brackets (22) are provided; The number of the Hall position sensors (14) is equal to the number of the roller brackets (22).

10. The peristaltic pump according to claim 7, characterized in that: The pump chamber (11) is provided with two pipeline notches (111) for clamping the hose (3), and the pipeline notches (111) are narrow at the top and wide at the bottom.

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