Peristaltic pump

Abstract

The utility model 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 enlarged only by changing the rotating direction of the pump head assembly, and the hose replacement process is greatly facilitated.

Description

Technical Field

[0001] This utility model relates to the field of peristaltic pump technology, and more specifically to a peristaltic pump. Background Technology

[0002] Blood purification refers to the process of drawing a patient's blood out of the body and passing it through a blood purification device to remove certain pathogenic substances (toxins) and water, thereby purifying the blood. Blood purification includes hemodialysis, hemofiltration, hemoperfusion, blood exchange, and immunoadsorption.

[0003] With advancements in medical technology, blood purification treatments have become increasingly diversified and specialized. Different conditions require different treatment approaches, resulting in a balance between therapeutic efficacy, indications, and economic feasibility. The peristaltic pump is a crucial independent unit within blood purification equipment. Currently, peristaltic pump technology is applied to various units in blood purification systems on the market, including blood pumps, dialysate pumps, replacement fluid pumps, waste fluid pumps, citrate pumps, and calcium pumps.

[0004] A peristaltic pump typically consists of a drive motor, a pump head, and a hose. It pumps fluid by alternately squeezing and releasing the pump's elastic delivery hose. The peristaltic pump is a crucial independent unit in blood purification equipment, ensuring the smooth operation of extracorporeal circulation.

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

[0006] For those skilled in the art, how to quickly and easily replace the tubing of a peristaltic pump is a technical problem that needs to be solved. Utility Model Content

[0007] The core of this invention is to provide a peristaltic pump that, when replacing a hose, simply reverse the pump assembly to release the pressure on the hose, increasing the clearance and enabling rapid hose replacement. The specific solution is as follows:

[0008] A peristaltic pump includes a pump chamber assembly and a pump head assembly, the pump head assembly being rotatably mounted to the pump chamber assembly;

[0009] The pump chamber assembly includes a pump chamber, a pump cover, and a limiting block; the inner cavity of the pump chamber is provided with cylindrical surfaces equidistant from the pump head assembly; the limiting block is elastically slidably fitted to the pump chamber, and the sliding direction is parallel to the rotation axis of the pump head assembly; the height of the limiting block gradually and smoothly increases along the forward rotation direction, and the width of the limiting block gradually and smoothly increases along the reverse rotation direction.

[0010] The pump head assembly includes a pump head base, a roller bracket, a compression roller, a limiting shaft, and an elastic element; the first end of the roller bracket is hinged to the pump head base, and the compression roller is rotatably connected to the second end of the roller bracket; the limiting shaft is disposed on the roller bracket; the elastic element is disposed between the pump head base and the roller bracket, and the elastic element applies an outward elastic force to the roller bracket, causing the compression roller to approach the inner wall of the pump chamber to cooperate with the compression hose;

[0011] When the pump head assembly rotates forward, the limiting shaft is directly opposite the lower end of the limiting block, and the limiting shaft presses the limiting block downward; when the pump head assembly rotates in reverse, the limiting shaft contacts the inner side of the narrow end of the limiting block, and the limiting shaft presses 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 provided 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 limiting block, and the elastic element applies an outward elastic force to the roller bracket, causing the roller bracket to press against the outer limiting block.

[0014] Optionally, the pump head base includes an upper base, a lower base, and a connecting block, wherein the upper base and the lower base are fixedly connected by the connecting block; the connecting block is provided with a groove for installing the elastic element;

[0015] The lower base is provided with a clearance notch for avoiding the limiting shaft, and the clearance notch is used to limit the extreme 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 limiting block and the pump chamber.

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

[0019] The extrusion roller is fixed relative to the limiting shaft, or the extrusion roller and the limiting shaft are fixed relative to each other and rotate relative to the roller support.

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

[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 equipped with a Hall effect cover sensor to sense the opening and closing status of the pump cover.

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

[0024] At least three roller brackets are provided;

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

[0026] Optionally, the pump chamber is provided with two pipe notches for holding the hose, the pipe notches being narrower at the top and wider at the bottom.

[0027] This invention provides a peristaltic pump. A limiting block is elastically slidably mounted in the pump chamber, with the sliding direction parallel to the rotation axis of the pump head assembly. The height of the limiting block gradually and smoothly increases along the forward rotation direction, and the width of the limiting block gradually and smoothly increases along the reverse rotation direction. The pump head assembly is rotatably mounted in the pump chamber assembly. When the pump head assembly rotates forward, the limiting shaft is directly opposite the lower end of the limiting block, and the limiting shaft presses the limiting block downward. At this time, the compression roller compresses the hose to achieve the pumping process. When the hose needs to be replaced, the pump head assembly reverses, and the limiting shaft contacts the inner side of the narrow end of the limiting block. The limiting shaft compression roller bracket rotates inward, thereby moving the compression roller away from the inner wall of the pump chamber, increasing the distance between the inner wall of the pump chamber and the compression roller, forming a larger gap, and thus enabling quick hose replacement. This invention only requires changing the rotation direction of the pump head assembly to increase the gap, greatly facilitating the hose replacement process. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an isometric view of one embodiment of the peristaltic pump of this utility model;

[0030] Figure 2 for Figure 1 Cross-sectional view along the AA direction;

[0031] Figure 3 for Figure 1 Cross-sectional view along the BB direction;

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

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

[0034] Figure 6 for Figure 5 Another perspective of the axonometric drawing;

[0035] Figure 7 This is a schematic diagram showing the limit block extending upwards.

[0036] Figure 8 This is a schematic diagram of the limit block retracting downwards;

[0037] Figure 9 A cross-sectional isometric view of one of the limiting blocks in the pump chamber;

[0038] Figure 10 An isometric view of the peristaltic pump of this utility model without the pump chamber and pump cover;

[0039] Figure 11 This is a schematic diagram showing the pump head assembly engaging with two limit blocks when it reverses.

[0040] Figure 12 for Figure 11 The front view;

[0041] Figure 13 for Figure 12 Cross-sectional view along the DD direction;

[0042] Figure 14 An isometric view of one embodiment of the pump head base;

[0043] Figure 15 This is an isometric view of the lower side of the limiting block;

[0044] Figure 16 This is an isometric view of one side of the narrow end of the limiting block.

[0045] The image includes:

[0046] Pump chamber assembly 1, pump chamber 11, pipe 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, screwing block 2111, lower base 212, clearance notch 2121, connecting block 213, outer limit block 214, roller bracket 22, extrusion roller 23, limit shaft 24, elastic element 25, guide block 26;

[0048] Hose 3. Detailed Implementation

[0049] The core of this invention is to provide a peristaltic pump that, when replacing a hose, only requires rotating the pump assembly in the reverse direction to release the pressure on the hose, increase the gap, and achieve rapid hose replacement.

[0050] To enable those skilled in the art to better understand the technical solution of this utility model, the peristaltic pump of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. The directions referred to herein correspond to the orientations shown in the accompanying drawings.

[0051] This utility model relates to a peristaltic pump, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the invention includes a pump chamber assembly 1 and a pump head assembly 2. The pump chamber assembly 1 is a fixed structure that remains stationary during use. The pump head assembly 2 and other structures can be installed within the pump chamber assembly 1. The pump head assembly 2 is rotatably mounted on the pump chamber assembly 1 and can rotate around its axis during use. The structure shown in the accompanying drawings of this invention is illustrated using the example of the pump head assembly 2 rotating around a vertical axis. This does not mean that the pump head assembly 2 can only rotate around a vertical axis; it can also rotate around a horizontal axis or use other orientations, all while achieving the same pumping effect. For ease of explanation, this invention uses... Figure 1 The directions shown are explained.

[0052] The pump chamber assembly 1 includes a pump chamber 11, a pump cover 12, and a limiting block 13; wherein the pump chamber 11 and the pump cover 12 cooperate to form an internally hollow cavity, and the pump cover 12 can be opened or closed relative to the pump chamber 11, and the pump cover 12 remains closed during operation. The pump cover 12 can adopt a rotating opening structure, or it can be directly removed from the pump chamber 11.

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

[0054] The limiting block 13 is elastically slidably fitted into the pump chamber 11, with its sliding direction parallel to the rotation axis of the pump head assembly 2. Figure 7 , Figure 8 , Figure 9As shown, the limiting block 13 is slidably mounted on the bottom plate of the pump chamber 11. A groove is provided below the limiting block 13 to accommodate the lifting spring 132. The lifting spring 132 can apply an upward elastic force to the limiting block 13, causing the limiting block 13 to tend to extend upward. When there is no external force pressing, the top of the limiting block 13 can protrude upward from the bottom plate of the pump chamber 11, forming a protrusion protruding from the bottom plate of the pump chamber 11. The limiting block 13 can only slide in a straight line and cannot rotate. When the limiting block 13 is subjected to a downward pressing force, the limiting block 13 can retract downward until the top of the limiting block 13 is flush with the upper surface of the bottom plate of the pump chamber 11.

[0055] Combination Figure 15 , Figure 16 As shown, the height of the limiting block 13 gradually and smoothly increases along the forward rotation direction, and the width of the limiting block 13 gradually and smoothly increases along the reverse rotation direction. Here, forward and reverse rotation refer to the rotation direction of the pump head assembly 2; the limiting block 13 itself does not rotate. The entire limiting block 13 has two dimensional characteristics: its height and width vary. The height of the limiting block 13 gradually increases along the forward rotation direction, and its width gradually decreases along the forward rotation direction; conversely, its width gradually increases along the reverse rotation direction, and its height gradually decreases along the reverse rotation direction. The outer surface of the limiting block 13 can be planar or curved. Figure 15 , Figure 16 The upper surface of the limiting block 13 consists of a section of inclined plane and a section of horizontal plane. The two sides of the limiting block 13 that create width variations are curved surfaces. The corresponding curved surfaces and planes in the diagram can be interchanged, and are not limited to these, as long as they allow for changes in height and width. The height variation of the limiting block 13 is reflected in the shape of its upper surface. The upper surface of the limiting block 13 serves as a guide surface, which can engage with the limiting shaft 24. The limiting shaft 24 can move relative to the upper surface of the limiting block 13. The width variation of the limiting block 13 results in a wedge-shaped structure at its narrower end.

[0056] Combination Figure 15 , Figure 16 As shown, the lower region of the limiting block 13 is configured as a flat plate structure. The aforementioned width variation refers to the upper region of the limiting block 13, and it is not required that the entire area form a wedge shape. The cross-sectional area of ​​the lower flat plate structure of the limiting block 13 is larger than that of the upper region with varying width. The lower flat plate structure contacts the bottom plate of the pump chamber 11, which can limit the highest position of the upward movement of the limiting block 13.

[0057] Combination Figure 10 , Figure 11As shown, the pump head assembly 2 includes a pump head base 21, roller brackets 22, compression rollers 23, a limiting shaft 24, and an elastic element 25. At least two roller brackets 22 are hinged to the pump head base 21. The roller brackets 22 can swing relative to the pump head base 21 about a rotation axis. 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 has a cylindrical or elliptical cylindrical shape, etc. Figure 4 As shown, a portion of the outer circumferential surface of the extrusion roller 23 protrudes from the roller bracket 22, allowing the outer surface of the extrusion roller 23 to directly contact the extrusion hose 3 for extrusion. The pump head base 21 rotates by itself, which in turn causes the roller bracket 22 and the extrusion roller 23 to rotate synchronously. During normal use, the roller bracket 22 does not rotate relative to the pump head base 21 or rotates only slightly. The extrusion roller 23 contacts the hose 3 and rotates relative to the roller bracket 22. From contact to separation, the extrusion roller 23 extrudes a section of the hose 3, causing the liquid inside the hose 3 to flow. During the rotation of the pump head base 21, the extrusion rollers 23 on each roller bracket 22 alternately and cyclically pull and compress the hose 3, enabling the hose 3 to 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 and can drive the pump head assembly 2 to rotate, realizing the forward or reverse rotation of the pump head assembly 2.

[0060] Combination Figure 13 As shown, the elastic element 25 is disposed between the pump head base 21 and the roller bracket 22. The elastic element 25 applies an outward elastic force to the roller bracket 22. The elastic force of the elastic element 25 can move the roller bracket 22 away from the pump head base 21, and make the extrusion roller 23 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 Figure 11 As shown, the limiting shaft 24 is disposed on the roller bracket 22. 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 limiting shaft 24 is used in conjunction with the limiting block 13, which is wider at its lower end and higher at its narrower end. When the pump head assembly 2 rotates forward, the limiting shaft 24 is directly opposite the lower end of the limiting block 13. Since the position of the limiting shaft 24 is fixed, the bottom end of the limiting shaft 24 applies a downward component force to the limiting block 13, causing the limiting shaft 24 to press the limiting block 13 downward, which allows the limiting block 13 to retract downward until the limiting shaft 24 completely passes over the limiting block 13 and then springs back upward. (Appendix) Figure 8 The image shows the limiting block 13 being compressed downwards. During forward rotation, 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, which allows for squeezing of the pump fluid.

[0063] Combination Figure 11 As shown, when the pump head assembly 2 reverses, the limiting shaft 24 contacts the inner surface of the narrow end of the limiting block 13. At this time, the limiting block 13 is not subjected to downward pressure, and the limiting block 13 applies a rotational force to the limiting shaft 24. The limiting shaft 24 compresses the roller bracket 22 and rotates inward, which causes the compressing roller 23 to move 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 compressing roller 23. During the reversal process, the distance between the compressing roller 23 and the inner wall of the pump chamber 11 is greater than the diameter of the hose 3, thus relieving the constraint on the hose 3.

[0064] It should be noted that the aforementioned forward and reverse rotation are two different directions. From a top-down view, if forward rotation is clockwise, then reverse rotation is counterclockwise. When the installation positions of the roller bracket 22 and the limit block 13 change, forward rotation can also be counterclockwise and reverse rotation can be clockwise.

[0065] The peristaltic pump of this invention, through the mutual cooperation between the limiting shaft 24 and the limiting block 13, can realize normal pumping of liquid when the pump head assembly 2 rotates forward. When replacing the hose 3, it is only necessary to change the rotation direction of the pump head assembly 2. By simply changing the rotation direction of the pump head assembly 2, the gap between the squeezing roller 23 and the inner wall of the pump chamber 11 can be increased, and 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 Figure 10 , Figure 11 , Figure 12As shown, guide blocks 26 are provided on the outer side of the roller bracket 22, that is, guide blocks 26 are provided on the surface of the roller bracket 22 away from the axis of the pump head base 21. Two guide blocks 26 are provided on one roller bracket 22. 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 within 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 limiting of the guide blocks 26, the hose 3 can be made to face the compression roller 23.

[0067] Combination Figure 10 , Figure 11 As shown, the pump head base 21 includes an outer limiting block 214, which is fixedly installed on the pump head base 21. The outer limiting block 214 limits the extreme position of the roller bracket 22 swinging outward. The elastic member 25 applies an outward elastic force to the roller bracket 22, moving the roller bracket 22 away from the axis of rotation of the pump head base 21, so that the roller bracket 22 presses on the outer limiting block 214, which can limit the size of the gap between the extrusion roller 23 and the inner wall of the pump chamber 11 during normal pumping.

[0068] Combination Figure 14 The diagram illustrates the structure of the pump head base 21. The pump head base 21 includes an upper base 211, a lower base 212, and a connecting block 213. The upper base 211 and lower base 212 are fixedly connected by the connecting block 213, forming a single unit. The connecting block 213 has grooves for mounting elastic elements 25, with one elastic element 25 installed in each groove. The elastic element 25 can be a spring. The connecting block 213 can have different shapes depending on the number of roller supports 22, and the number of flat surfaces on the connecting block 213 is equal to the number of roller supports 22. The lower base 212 has a clearance notch 2121 for avoiding the limiting shaft 24. The clearance notch 2121 limits the inward movement of the roller support 22. Figure 11 As shown, when the pump head base 21 reverses, the limiting block 13 pushes the limiting shaft 24 to move inward, thereby causing the end of the roller bracket 22 on which the extrusion roller 23 is mounted to approach the rotating shaft of the pump head base 21; at this time, the limiting shaft 24 enters the clearance notch 2121, the clearance notch 2121 provides clearance space for the limiting shaft 24, and the bottom end of the slot of the clearance notch 2121 can limit the extreme position of the limiting shaft 24.

[0069] Combination Figure 11 As shown, the upper base 211 is provided with a screwing block 2111 for screwing. The screwing block 2111 protrudes upward from the upper surface of the upper base 211, allowing fingers to pinch it and rotate the upper base 211, which is convenient for assembly. For example, in reverse, the driver 16 can be stopped, and the operator can manually rotate the pump head base 21 in the opposite direction.

[0070] Combination Figure 9 , Figure 12 As shown, a buffer pad 131 is provided at the contact surface between the limiting block 13 and the pump chamber 11. The buffer pad 131 can be made of materials such as rubber and silicone, which can reduce the noise generated when the limiting block 13 rebounds upward and collides with the pump chamber 11.

[0071] Combination Figure 11 As shown, the extrusion roller 23 is mounted on the limiting shaft 24; the extrusion roller 23 is fixed relative to the limiting shaft 24, or the extrusion roller 23 and the limiting shaft 24 are relatively fixed and rotate relative to the roller bracket 22. This includes two cases: the limiting shaft 24 is fixed to the roller bracket 22, and the extrusion roller 23 rotates relative to the limiting shaft 24; or the extrusion roller 23 and the limiting shaft 24 are relatively fixed, and the limiting shaft 24 and the extrusion roller 23 rotate synchronously, allowing rotation relative to the roller bracket 22.

[0072] Based on any of the above technical solutions and their combinations, combined with Figure 2 , Figure 12 As shown, the pump chamber 11 of this invention is equipped with a Hall position sensor 14. The Hall position sensor 14 is used to sense the position signal of the limit shaft 24 and determine the reverse rotation state of the pump head assembly 2. For example, when the driver 16 drives the pump head assembly 2 to reverse, the position signal of the limit shaft 24 can be sensed by the Hall position sensor 14. 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 equipped with a magnet and the other is equipped with a magnetic block to achieve magnetic attraction and ensure the tightness of the pump chamber 11 and the pump cover 12 when closed.

[0074] A Hall effect sensor 15 is installed in the pump chamber 11 or the pump cover 12 to sense the opening and closing status of the pump cover 12. When the Hall effect sensor 15 detects that the pump cover 12 is open, it can forcibly stop the drive 16 to avoid injury to the operator.

[0075] At least two limit blocks 13 should be set, in combination Figure 6 , Figure 9 As shown, two limit blocks 13 are provided on the pump chamber 11 to ensure that the two extrusion rollers 23 are moved away from the inner wall of the pump chamber 11 when the pump reverses.

[0076] At least three roller supports 22 are provided, and therefore at least three compression rollers 23 are provided, so that the hose 3 is squeezed alternately to ensure continuous pumping of liquid.

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

[0078] Combination Figure 5 As shown, the pump chamber 11 is provided with two pipe notches 111 for inserting the hose 3. The pipe notches 111 are narrower at the top and wider at the bottom. The hose 3 can be inserted into the pipe notches 111 from top to bottom. The width of the narrower part at the top of the pipe notch 111 is less than the diameter of the hose 3, and the width of the wider part at the bottom is slightly larger than the diameter of the hose 3.

[0079] This utility model provides a peristaltic pump for use in, but not limited to, blood purification equipment. The pump head assembly 2 of the peristaltic pump is retracted by the reverse rotation of the driver 16, which increases the gap between the squeeze roller 23 and the inner wall of the pump chamber 11, and enables convenient disassembly and assembly of the hose 3.

[0080] The linkage design between the pump head assembly 2 and the pump chamber 11 in this utility model cleverly utilizes the concept of a ratchet mechanism. Without adding a power source, it enables the compression roller 23 of the peristaltic pump head assembly 2 to retract, increasing the gap between the compression roller 23 and the inner wall of the pump chamber 11. This facilitates convenient assembly and disassembly of the pipeline. Furthermore, the structure is simple, with fewer parts, reducing manufacturing costs and minimizing the time and labor costs for medical personnel.

[0081] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those 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 is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A peristaltic pump, characterized in that, It includes a pump chamber assembly (1) and a pump head assembly (2), wherein the pump head assembly (2) is rotatably mounted on the pump chamber assembly (1). The pump chamber assembly (1) includes a pump chamber (11), a pump cover (12), and a limiting block (13); the inner cavity of the pump chamber (11) is provided with cylindrical surfaces that are equidistant from the pump head assembly (2); the limiting block (13) is elastically slidably fitted to the pump chamber (11), and the sliding direction is parallel to the rotation axis of the pump head assembly (2); the height of the limiting block (13) gradually and smoothly increases along the forward rotation direction, and the width of the limiting block (13) gradually and smoothly increases along the reverse rotation direction; The pump head assembly (2) includes a pump head base (21), a roller bracket (22), a compression roller (23), a limiting shaft (24), and an elastic element (25). The first end of the roller bracket (22) is hinged to the pump head base (21), and the compression roller (23) is rotatably connected to the second end of the roller bracket (22). The limiting shaft (24) is disposed on the roller bracket (22). The elastic element (25) is disposed between the pump head base (21) and the roller bracket (22). The elastic element (25) applies an outward elastic force to the roller bracket (22), causing the compression roller (23) to approach the inner wall of the pump chamber (11) to cooperate with the compression hose (3). When the pump head assembly (2) rotates forward, the limiting shaft (24) is directly opposite the lower end of the limiting block (13), and the limiting shaft (24) presses the limiting block (13) downward; when the pump head assembly (2) rotates in reverse, the limiting shaft (24) contacts the inner side of the narrow end of the limiting block (13), and the limiting shaft (24) presses the roller bracket (22) to rotate inward, thereby increasing the distance between the inner wall of the pump chamber (11) and the extrusion roller (23).

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

3. The peristaltic pump according to claim 1, characterized in that, The pump head base (21) includes an outer limiting block (214), and the elastic element (25) applies an outward elastic force to the roller bracket (22), so that the roller bracket (22) presses on the outer limiting block (214).

4. The peristaltic pump according to claim 1, characterized in that, 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). The connecting block (213) is provided with a groove for installing the elastic element (25). The lower base (212) is provided with a clearance notch (2121) for avoiding the limiting shaft (24), and the clearance notch (2121) is used to limit the extreme position of the roller bracket (22) moving inward; The upper base (211) is provided with a screwing block (2111) for screwing.

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

6. The peristaltic pump according to claim 1, characterized in that, The extrusion roller (23) is mounted on the limiting shaft (24). The extrusion roller (23) is fixed relative to the limiting shaft (24), or the extrusion 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 equipped with a Hall position sensor (14) to sense the position signal of the limit shaft (24) and determine the reversed position of the pump head assembly (2).

8. The peristaltic pump according to claim 7, characterized in that, A door magnet and a magnetic block are provided between the pump chamber (11) and the pump cover (12) to achieve magnetic attraction; The pump chamber (11) or the pump cover (12) is equipped with a Hall effect cover sensor (15) to sense 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 Hall position sensors (14) is equal to the number of roller brackets (22).

10. The peristaltic pump according to claim 7, characterized in that, Two pipe notches (111) are provided on the pump chamber (11) for holding the hose (3), and the pipe notches (111) are narrow at the top and wide at the bottom.

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