A peristaltic pump with a squeeze mechanism and its flow control method

Abstract

This specification discloses a squeeze-type peristaltic pump and its flow control method. The squeeze-type peristaltic pump includes: a body, a first transmission component, a second transmission component, a squeezing element, a stop block, and a limiting plate. The limiting plate is disposed on the upper end face of the body and fixedly connected to the body. A hose is placed below the limiting plate. The squeezing element reciprocates under the drive of the first transmission component to press the hose. The stop block reciprocates under the drive of the second transmission component to stop the liquid inlet or outlet of the hose. The first and second transmission components are driven by different power devices. In this solution, the squeezing element and the stop block are driven by different power devices. The transmission angle of the first transmission component can be adjusted according to the flow requirements, thereby adjusting the squeezing height of the squeezing element on the hose, thus achieving adjustable flow rate.

Description

Technical Field

[0001] This application relates to the field of peristaltic pump technology, and in particular to a squeeze-type peristaltic pump and its flow control method. Background Technology

[0002] A peristaltic pump, also known as a flexible tubular pump, is used to create flow of liquid within a flexible tubular conduit for liquid transport. Existing peristaltic pumps are typically rotary peristaltic pumps, which suffer from significant wear on the tubing and a tendency for tubing misalignment over prolonged use. Summary of the Invention

[0003] In view of this, embodiments of this application provide a squeeze-type peristaltic pump and a flow control method thereof to improve the life of the hose and control the flow rate of the peristaltic pump.

[0004] To solve the above-mentioned technical problems, the embodiments in this specification are implemented as follows:

[0005] This specification provides an embodiment of a squeeze-type peristaltic pump, comprising: a body, a first transmission component, a second transmission component, a squeeze component, a stop block, and a limiting plate. The limiting plate is disposed on the upper end face of the body and is fixedly connected to the body. A hose is placed below the limiting plate.

[0006] The extrusion member reciprocates under the drive of the first transmission component to press the hose; the shut-off block reciprocates under the drive of the second transmission component to shut off the inlet or outlet of the hose. The first transmission component and the second transmission component are driven by different power devices.

[0007] Optionally, the stop block includes a liquid inlet stop block and a liquid outlet stop block, which are disposed on both sides of the extruder.

[0008] Optionally, the extruder reciprocates linearly under the drive of the first transmission component, and the stop block reciprocates linearly under the drive of the second transmission component.

[0009] Optionally, the first transmission component and the second transmission component are eccentric transmission mechanisms or linear transmission mechanisms.

[0010] Optionally, the first transmission component includes a first main shaft and a first cam fixedly mounted on the first main shaft, and the second transmission component includes a second main shaft and a second cam and a third cam fixedly mounted on the second main shaft at intervals. The phase angles corresponding to the highest peaks of the second cam and the third cam are different. The first main shaft and the second main shaft are arranged parallel to each other along the liquid transmission direction. Along the liquid transmission direction, the first cam is located between the second cam and the third cam. The phase angles corresponding to the highest peaks of the first cam and the second cam are different, and the phase angles corresponding to the highest peaks of the first cam and the third cam are different.

[0011] Optionally, when the second spindle is positioned close to the hose, a first adapter block is provided between the first cam and the extruder, the second spindle is located above the first spindle, and the first adapter block passes through the second spindle.

[0012] Optionally, when the first spindle is positioned close to the hose, a second adapter block is provided between the second cam and the inlet stop block, and a third adapter block is provided between the third cam and the outlet stop block. The first spindle is located above the second spindle, and the second adapter block and the third adapter block pass through the first spindle.

[0013] Optionally, the first cam is used to drive the extruder to perform linear reciprocating motion, the second cam is used to drive the liquid inlet stop block to perform linear reciprocating motion, and the third cam is used to drive the liquid outlet stop block to perform linear reciprocating motion. The liquid inlet stop block and the liquid outlet stop block alternately maintain pressure on the hose.

[0014] Optionally, the first cam, the second cam, or the third cam are all eccentric wheels, and the extrusion component is a pressure block.

[0015] Optionally, the extruder is disposed inside the main body, and the main body is provided with a pressing block movable groove. A hose fixing part is provided at the groove opening end of the pressing block movable groove, and the limiting plate is detachably fixedly connected to the groove opening end of the pressing block movable groove.

[0016] Optionally, the hose fixing part is a groove on the body or a buckle that can be detachably installed on the body.

[0017] Optionally, the inner side of the pressing block movable groove is provided with multiple slide rails along the moving direction of the extruder.

[0018] Optionally, the liquid inlet stop block and the liquid outlet stop block are clamping blocks.

[0019] Optionally, the limiting plate is located near the end face of the hose, and an elastic material is provided at the position corresponding to the clamping block.

[0020] Optionally, the extrusion member includes two or more sub-pressing blocks, or the liquid inlet stop block includes two or more sub-stop blocks, or the liquid outlet stop block includes two or more sub-stop blocks.

[0021] Optionally, there are multiple limiting plates, each corresponding to the liquid inlet stop block, the extrusion component, and the liquid outlet stop block.

[0022] Optionally, the extruder is driven by the first transmission component to perform a oscillating reciprocating motion.

[0023] Optionally, the first transmission component is a cam, and the extrusion component is a swing rod. One end of the swing rod is hinged to the body, and the other end of the swing rod swings back and forth under the drive of the cam, periodically extruding the hose.

[0024] Optionally, both the first transmission component and the extrusion component are rods, forming a linkage mechanism. One end of the extrusion component oscillates and reciprocates under the drive of the first transmission component, periodically extruding the hose.

[0025] Optionally, a spring is provided between the limiting plate and the extrusion member, and between the limiting plate and the stop block, and the spring is in a compressed state.

[0026] Optionally, the extrusion peristaltic pump further includes: a chute block fixedly connected to the body, wherein the chute block and the body form a chute for accommodating the limiting plate.

[0027] Optionally, the sliding block does not obstruct the hose fixing part.

[0028] Optionally, there are two sliding blocks, and the sliding blocks are L-shaped.

[0029] This specification provides an embodiment of a flow control method for a peristaltic pump, the method comprising:

[0030] Obtain the volume of the liquid to be filled and the maximum filling volume of the squeeze-type peristaltic pump;

[0031] The first rotation parameter of the first transmission component is determined based on the volume of the liquid to be filled and the maximum volume of the liquid to be filled.

[0032] The rotation of the first transmission component is controlled according to the first rotation parameter to complete the filling of one volume of liquid to be filled.

[0033] Optionally, the first transmission component is a cam, and the first rotation parameter is the cam's push-stroke motion angle; the cam's push-stroke motion angle is related to the filling volume of the extrusion peristaltic pump, and the relationship is determined by the shape of the cam;

[0034] The first rotation parameters of the first transmission component are determined based on the volume of the liquid to be filled and the maximum volume of the liquid to be filled, specifically including:

[0035] Find the cam's push stroke angle corresponding to the volume of liquid to be filled from the aforementioned correlation.

[0036] Optionally, the motion angle of the cam during its push stroke is linearly related to the filling volume of the peristaltic pump.

[0037] The first rotation parameters of the first transmission component are determined based on the volume of the liquid to be filled and the maximum volume of the liquid to be filled, specifically including:

[0038] Determine the ratio between the volume of the liquid to be filled and the maximum volume of liquid to be filled;

[0039] The angle of motion of the cam during its push stroke is determined based on the cam's push stroke angle and the proportional relationship.

[0040] Optionally, the method further includes:

[0041] The second rotation parameter of the first transmission component is determined based on the first rotation parameter, wherein the first rotation parameter includes a time parameter;

[0042] The rotation of the second transmission component is controlled according to the second rotation parameter.

[0043] Optionally, determining the second rotation parameter of the first transmission component based on the first rotation parameter specifically includes:

[0044] The rotation time of the first spindle is determined based on the first rotation parameters;

[0045] The rotation time of the second spindle is determined based on the rotation time of the first spindle.

[0046] The above-described at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0047] The hose is compressed using an extruder, which reduces the friction between the hose and the extruder, reduces hose fatigue damage, and improves hose life.

[0048] The extrusion member and the shut-off block are driven by different power devices. The transmission angle of the first transmission component can be adjusted according to the flow requirements, thereby adjusting the extrusion height of the extrusion member on the hose, thus realizing the function of adjustable flow. Attached Figure Description

[0049] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0050] Figure 1 This is a schematic diagram of an embodiment of a squeeze-type peristaltic pump provided in this specification.

[0051] Figure 2 for Figure 1 The left view of Embodiment 1 shown;

[0052] Figure 3 for Figure 1 The right view of Embodiment 1 shown;

[0053] Figure 4 for Figure 1 The internal structure diagram of Embodiment 1 shown Figure 1 ;

[0054] Figure 5 for Figure 1 The internal structure diagram of Embodiment 1 shown Figure 2 ;

[0055] Figure 6 This is a schematic diagram of the transmission components and extrusion parts of Embodiment 3 of the extrusion peristaltic pump;

[0056] Figure 7 This is a schematic diagram of the transmission components and extrusion parts of the extrusion peristaltic pump in Embodiment 4.

[0057] Figure 8 This is a schematic flowchart of a flow control method for a peristaltic pump provided in the embodiments of this specification.

[0058] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Body; 101. Pressing block movable groove; 102. Hose fixing part; 103. Slide rail; 104. Limiting groove; 2. Limiting plate; 3. Liquid inlet stop block; 4. Working pressing block; 5. Liquid outlet stop block; 6. Camshaft No. 1; 601. Main shaft one; 602. Liquid inlet stop cam; 603. Liquid outlet stop cam; 7. Camshaft No. 2; 701. Main shaft two; 702. Extrusion cam; 8. Motor No. 1; 9. Motor No. 2; 10. Adapter block; 11. Slide block; 12. Spring; 1201. Spring groove one; 1202. Spring groove two; 13. Connecting rod one; 14. Connecting rod two; 15. Slider; 16. Swing rod; 17. Cam; 18. Hose Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] This specification provides an embodiment of a squeeze-type peristaltic pump, including: a body, a first transmission component, a second transmission component, a squeeze component, a stop block, and a limiting plate. The limiting plate is disposed on the upper end face of the body and is fixedly connected to the body. A hose is placed below the limiting plate.

[0061] The extrusion member reciprocates under the drive of the first transmission component to press the hose; the shut-off block reciprocates under the drive of the second transmission component to shut off the inlet or outlet of the hose. The first transmission component and the second transmission component are driven by different power devices.

[0062] It should be noted that there are no specific restrictions on reciprocating motion; it can be linear reciprocating motion or oscillating reciprocating motion, as long as it can press the hose and achieve fluid transfer.

[0063] Optionally, the extrusion member reciprocates linearly or oscillatingly under the drive of the first transmission component, while the shut-off block reciprocates linearly under the drive of the second transmission component. The linear reciprocating motion of the shut-off block is more conducive to effectively shutting off the hose.

[0064] The body refers to the entire extrusion peristaltic pump; all other structures are built upon this body. The body can also be called a housing, frame, or other names. The body can be a hollow housing, have no top cover, or have no top or bottom cover. In some embodiments, the transmission component, extrusion member, and stop block can be located inside or outside the body. The extrusion member and stop block can correspond to one or multiple bodies. Similarly, there can be one, two, or more limiting plates.

[0065] An extrusion component can be understood as a part, component, or element that can press against a hose. For example, an extrusion component can be a pressure block or a rod. Compared to traditional rotary peristaltic pumps, the intermittent movement of the extrusion component reduces axial rubbing of the hose, thereby reducing excessive axial friction, increasing hose lifespan, and improving transmission accuracy. The extrusion component can be a single part or a combination of multiple parts forming a whole.

[0066] A limiting plate is used to limit the movement of the hose; it can also be called a fixing block, fixing plate, support plate, or upper pressure block, etc., to fix the hose between the limiting plate and the extrusion component or stop block. The limiting plate functions similarly to the upper pressure block of a rotary peristaltic pump. Multiple limiting plates can be used, each corresponding to a different extrusion component or stop block.

[0067] The limiting plate is fixedly connected to the body, including detachable and non-detachable connections. Detachable connections can include hinges, threaded connections, etc.

[0068] A shut-off block is used to cut off the liquid inlet or outlet of the hose. Therefore, a shut-off block can include an inlet shut-off block and a outlet shut-off block, which are located on both sides of the extruder. The inlet and outlet shut-off blocks can be installed separately or as a single unit. The inlet and outlet shut-off blocks can be driven by one or two transmission components. For convenience and to reduce size, the inlet and outlet shut-off blocks can be driven by a single motor.

[0069] It should be noted that the stop block here can be a mechanical component (such as a pressure block) or an electronic component (such as an electronic valve).

[0070] Since effective shut-off of the hose is required, the structure of the shut-off block can be selected according to this requirement. For example, a clamping block can be used.

[0071] The first transmission component is used to drive the extruder to press the hose. This transmission component can be an eccentric transmission mechanism such as a cam, a linkage mechanism, or a linear transmission mechanism. The transmission component and the extrusion unit can have point contact, line contact, or surface contact.

[0072] The second transmission component is used to drive the shut-off block to cut off the liquid inlet and outlet ends of the hose. Similarly, the second transmission component can also be an eccentric transmission mechanism such as a cam, a linkage mechanism, or a linear transmission mechanism. For the inlet and outlet shut-off blocks, the second transmission component can be an integral structure or a separate structure. That is, the second transmission component can include two independent structures or two interconnected structures. The first and second transmission components can use the same structure or different structures, depending on the actual scenario and area limitations.

[0073] The first and second transmission components are driven by different power units. With this design, the transmission angle of the first transmission component can be adjusted by controlling the power unit according to the flow requirements, thereby adjusting the extrusion height of the extruder on the hose and thus achieving the function of adjustable flow.

[0074] It should be noted that in this scheme, a single flexible tube can be set to form a single-channel peristaltic pump, or two or more flexible tubes can be set to form a dual-channel or multi-channel peristaltic pump.

[0075] A preferred implementation involves a structure with a main shaft and an eccentric component in both the first and second transmission components. An eccentric component can be understood as a component whose geometric center and center of mass (center of gravity) are not at the same point. An eccentric transmission mechanism can include an eccentric wheel and a cam. An eccentric wheel primarily refers to a circular wheel whose center and center of rotation are not aligned. A cam can refer to a rotating or sliding component of a machine (such as a wheel or a protruding part of a wheel), which transmits motion to the edge of the wheel. A cam-follower mechanism, based on the cam profile, can enable the follower to obtain any desired motion law, and its structure is simple and compact. An eccentric wheel can be considered a type of cam.

[0076] In one embodiment, the first transmission component includes a first main shaft and a first cam fixedly mounted on the first main shaft. The second transmission component includes a second main shaft and a second cam and a third cam fixedly mounted at intervals on the second main shaft. The phase angles corresponding to the highest peaks of the second cam and the third cam are different. The first main shaft and the second main shaft are arranged longitudinally parallel to each other along the liquid transmission direction. Along the liquid transmission direction, the first cam is located between the second cam and the third cam. The phase angles corresponding to the highest peaks of the first cam and the second cam are different, and the phase angles corresponding to the highest peaks of the first cam and the third cam are also different. The first cam is used to drive the extruder to perform linear reciprocating motion, the second cam is used to drive the inlet stop block to perform linear reciprocating motion, and the third cam is used to drive the outlet stop block to perform linear reciprocating motion. The inlet stop block and the outlet stop block alternately maintain pressure on the hose.

[0077] In these embodiments, the eccentric transmission mechanism is entirely implemented using a cam structure, working together to drive different extrusion components to achieve different functions. The different positions of the cam peaks can be understood as variations in the central angle corresponding to the peak positions. For example, when the second cam is in a cut-off state for the hose, the third cam cannot be in a cut-off state for the hose; that is, the phase angle corresponding to the peak of the second cam is different from the phase angle corresponding to the peak of the third cam.

[0078] The phase angle can be understood as the angle between the positive X-axis and the direction of motion of the cam follower when the origin of the X and Y two-dimensional coordinates is placed at the center of the cam spindle. It is used when calculating the relative rotation angle of the cam profile with respect to the camshaft keyway when determining the origin of motion.

[0079] The different phase angles corresponding to the highest peaks of the three cams are designed to allow the functions of the various structures of the extruder to be differentiated when the extruder is pressing the hose, so that different processes, such as liquid inlet, transfer, and liquid outlet, can be achieved continuously.

[0080] In the above embodiments, the first cam, the second cam, or the third cam can all be eccentric wheels, or partially eccentric wheels, and the extrusion component can be a pressure block.

[0081] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0082] Example 1

[0083] Figures 1-5 This is a schematic diagram of an embodiment of a squeeze-type peristaltic pump. Figure 1-5 As shown, the squeeze-type peristaltic pump includes: a body 1, a limiting plate 2, an inlet stop block 3, a working pressure block 4, a drain stop block 5, a camshaft 1 6, a camshaft 2 7, a motor 1 8, and a motor 2 9. The limiting plate 2 is disposed on the upper end face of the body 1 and is detachably and fixedly connected to the body 1. A flexible hose is placed between the limiting plate 2 and the inlet stop block 3, the working pressure block 4, and the drain stop block 5.

[0084] The main body 1 is provided with a pressing block movable groove 101, in which a liquid inlet stop block 3, a working pressing block 4, a liquid outlet stop block 5, a camshaft 1 6, and a camshaft 2 7 are disposed. Both the liquid inlet stop block 3 and the liquid outlet stop block 5 are located at the ends of the pressing block movable groove 101, with the liquid inlet stop block 3 closer to the liquid inlet direction of the hose and the liquid outlet stop block 5 closer to the liquid outlet direction of the hose. The working pressing block 4 is disposed between the liquid inlet stop block 3 and the liquid outlet stop block 5.

[0085] Working pressure block 4 reciprocates linearly under the drive of camshaft 2, used to press the hose; inlet stop block 3 and outlet stop block 5 reciprocate linearly under the drive of camshaft 1 6, used to shut off the inlet or outlet of the hose. Motor 1 8 provides power to camshaft 1 6, and motor 2 9 provides power to camshaft 2 7.

[0086] During operation, motor 9 controls the camshaft 2 independently, thereby controlling the pushing speed of the working block and making the flow rate and liquid volume adjustable.

[0087] In addition, by controlling the linkage between motor 1 and motor 2, the drainage process can be stopped in a timely manner to avoid excess liquid discharge.

[0088] By independently controlling the extrusion cam with motor No. 2, multiple liquid separations can be achieved with a single liquid storage, thus improving work efficiency.

[0089] like Figure 3As shown, camshaft 1 (6) is located above camshaft 2 (7). Camshaft 1 (6) includes a main shaft 601 and two fixedly spaced liquid inlet stop cams 602 and 603. The liquid inlet stop cams 602 and 603 are arranged along the liquid transmission direction on camshaft 1 (6). The far repose angles of the liquid inlet stop cams 602 and 603 are different, so that the liquid inlet stop cams 602 and 603 cannot simultaneously push the liquid inlet stop block 3 and the liquid outlet stop block 5 to close the hose. The liquid inlet stop cams and the liquid outlet stop cams can be eccentric wheels with different phase angles.

[0090] The second camshaft 7 includes a compression cam 702 mounted on the second main shaft 701. The compression cam 702 is positioned between the liquid inlet stop cam 602 and the liquid outlet stop cam 603. The liquid inlet stop cam 602 corresponds to the liquid inlet stop block 3, the liquid outlet stop cam 603 corresponds to the liquid outlet stop block 5, and the compression cam 702 corresponds to the working pressure block 4.

[0091] Main shaft 2 701 and main shaft 1 601 are arranged longitudinally parallel to each other along the liquid transmission direction. Along the liquid transmission direction, the compression cam 702 is located between the inlet stop cam 602 and the outlet stop cam 603. The phase angles corresponding to the highest peaks of the compression cam 702 and the inlet stop cam 602 are different, as are the phase angles corresponding to the highest peaks of the compression cam 702 and the outlet stop cam 603. The compression cam 702 drives the working pressure block 4 to perform linear reciprocating motion, the inlet stop cam 602 drives the inlet stop block 3 to perform linear reciprocating motion, and the outlet stop cam 603 drives the outlet stop block 5 to perform linear reciprocating motion. The inlet stop block 3 and the outlet stop block 5 alternately maintain pressure on the hose.

[0092] A transition block 10 is also provided between the extrusion cam 702 and the working pressure block 4. The transition block 10 spans the main shaft 601 and makes pressure contact with the working pressure block 4, which is used for power transmission between the extrusion cam 702 and the working pressure block 4. Due to the different phase angles of adjacent cams, the action sequence of the liquid inlet stop block 3, the working pressure block 4 and the liquid outlet stop block 5 is different.

[0093] The adapter block 10 is designed to prevent interference between the No. 2 camshaft 7 and the No. 1 camshaft 6, thereby transmitting the thrust of the extrusion cam 702 to the working pressure block 4.

[0094] The inner side of the pressing block movable groove 101 is provided with a limiting channel 104. The adapter block 10 is slidably placed in the space of the adjacent limiting channel 104. The adapter block 10 can slide up and down along the limiting channel 104 to avoid misalignment.

[0095] The inlet shut-off cam 602, the compression cam 702, and the outlet shut-off cam 603 are all basic cam structures, including a push stroke section, a far rest section, a return stroke section, and an initial section. During the rotation of the camshaft, the push stroke section pushes the pressure block upward to compress the hose, and the far rest section holds the pressure block at the compression height. When the cam moves to the return stroke section, due to the gravity of the pressure block, the pressure block moves downward to release the hose and returns to the initial section along the return stroke section, completing the hose reset. The compression and reset of the hose are completed through the periodic movement of the cam.

[0096] The phase angles of the inlet and outlet stop cams are related. Within the circumference range, the far rest sections of the inlet and outlet stop cams are interlocked, so that the camshaft has a pressure block to keep the hose at the highest position at any angle, keeping the hose in a closed and flow-stopped state.

[0097] The initial section arc diameters of the inlet stop cam, the squeeze cam, and the outlet stop cam are the same, so that the hose maintains the same elastic state in the reset position. The cams all start to squeeze from the elastic deformation of the hose (such as at 80% of the hose height). That is, when the pressure block is in the initial section position of the cam, it exerts a certain squeezing force on the hose, so that the hose of the flow-controllable squeeze peristaltic pump always maintains a good elastic recovery state during operation.

[0098] The inlet and outlet stop cams have the same distal end section. In this distal end section, the distance between the stop block and the limiting plate is less than twice the wall thickness of the hose, creating overpressure in the hose. This ensures a tight seal in the distal end section of the stop block, preventing backflow of liquid into the pipeline. In contrast, the distal end section of the compression cam has a smaller diameter than that of the stop cam, and the distance between the working pressure block and the limiting plate in this distal end section is greater than twice the wall thickness of the hose. This prevents excessive compression of the hose, thereby improving the hose's elasticity and resilience at the working pressure block position, reducing fatigue damage in the working pressure block area, and increasing the hose's mobility and service life.

[0099] The main body 1 includes a pressure block movable groove 101 disposed in the hose extrusion area. A hose fixing part 102 is provided at the end of the pressure block movable groove 101, which is used to clamp and fix the hose. A limiting plate 2 is detachably connected to the end face of the groove of the pressure block movable groove 101. The limiting plate 2 covers the hose fixing part 102, assisting the hose fixing part 102 in clamping and fixing the hose, and providing a support surface for the working pressure block to extrude. In this embodiment, the hose fixing part 102 is a groove on the main body 1, and both ends of the hose pass through this groove. This structure is relatively simple and does not affect the installation of the limiting plate 2.

[0100] Among them, the liquid inlet stop block 3, the working pressure block 4 and the liquid outlet stop block 5 are arranged close together in the pressure block movable groove 101, so that the liquid volume between the sliders is fixed and the discharge flow rate is fixed, which makes it easy to achieve precise adjustment of the liquid flow rate.

[0101] In other embodiments, a snap-fit ​​mechanism can be provided on the main body 1 to clamp the hose, which will not be described in detail here.

[0102] Multiple slide rails 103 are also provided on the inner side of the pressing block moving groove 101 along the moving direction of the pressing block. The pressing block moves along the slide rails 103 to reduce the friction of the pressing block movement.

[0103] A sliding block 11 is fixedly connected above the movable groove of the pressure block, forming a groove between the sliding block 11 and the body 1 to accommodate the limiting plate 2. The limiting plate 2 can slide into the gap between the sliding block 11 and the body 1 along one side of the groove and is fixedly connected to the body 1 by screws. There are two sliding blocks 11, and the sliding blocks 11 are L-shaped. The two sliding blocks 11 are symmetrically arranged and do not contact each other, so as not to obstruct the hose fixing part 102.

[0104] A spring 12 is installed between the limiting plate 2 and the pressure blocks (inlet stop block 3, working pressure block 4, and outlet stop block 5), and the spring 12 is always in a compressed state. A spring groove 1201 is provided on one side of the pressure block's pressing surface, and a spring groove 1202 corresponding to the spring groove 1201 is provided on the sliding block 11. The spring 12 is positioned between the spring groove 1201 and the spring groove 1202 to maintain the pressure block's restoring force, preventing the pressure block from being difficult to reset due to insufficient elasticity of the hose during peristaltic pump operation. Additionally, the sliding block is provided with a slide rail for accommodating the support plate.

[0105] To facilitate the clamping of the hose by the inlet stop block 3 and the outlet stop block 5, the inlet stop block 3 and the outlet stop block 5 are designed as clamping blocks, that is, the top has a certain angle, which reduces the squeezing area of ​​the stop block, increases the pressure of the clamping block on the hose, improves the pressure effect, and enables the stop block to quickly press and close the hose to achieve flow interruption.

[0106] Alternatively, an elastic material can be placed on the lower end face of the limiting plate (near the end face of the hose) and at the position corresponding to the clamping block. This way, the hose can still be clamped even when the clamping block wears out.

[0107] This embodiment improves the integration of the press-type peristaltic pump, reduces structural complexity, and enhances the working efficiency, transmission accuracy, hose lifespan, and overall service life of the peristaltic pump.

[0108] Based on the above principle, the working process of a peristaltic pump is as follows:

[0109] Step 1: The No. 1 camshaft rotates, the inlet shut-off cam closes the pipeline, and the outlet shut-off cam opens the pipeline and maintains this state, preparing for liquid discharge;

[0110] Step 2: Motor 2 controls the rotation of camshaft 2. When the extrusion cam contacts the working pressure block, it enters the push stroke section. The extrusion cam pushes the working pressure block to squeeze the hose, and the liquid is squeezed out from the hose. After the cam has rotated through the predetermined angle, motor 2 stops rotating, and the liquid discharge process stops.

[0111] Step 3: When camshaft No. 1 rotates, the drain stop cam closes and the inlet stop cam opens, ensuring unobstructed inlet flow through the hose.

[0112] Step 4: Start motor 2 to drive the extrusion cam to rotate forward or backward, so that the contact area between the extrusion cam and the working pressure block enters the near rest section, releasing the extrusion on the hose. During the hose recovery process, the space expands, and liquid enters the hose from the hose inlet direction, completing the liquid accumulation in the hose.

[0113] Step 5: Return to Step 1.

[0114] By continuously repeating the above steps, the liquid can be moved from the inlet direction to the outlet direction within the hose, thus achieving the pumping function of a peristaltic pump with controllable flow rate.

[0115] Example 2

[0116] Unlike Embodiment 1, when the No. 2 camshaft is positioned close to the hose, a transition block needs to be installed between the inlet stop cam 602 and the inlet stop block 3 on the No. 1 camshaft, and a transition block also needs to be installed between the drain stop cam 603 and the drain stop block 5. Both transition blocks need to cross the No. 2 camshaft.

[0117] The structure of this embodiment is more complex than that of Embodiment 1, and its stability is also not as good as that of Embodiment 1.

[0118] Example 3

[0119] Unlike Embodiment 1, the transmission component can be a linkage mechanism, where one end of the extruder performs a linear reciprocating motion driven by the linkage (e.g., Figure 6 As shown), the hose is periodically squeezed.

[0120] like Figure 6 As shown, connecting rod 13 can rotate around one end, and then connecting rod 13 drives connecting rod 2 14 to rotate. Connecting rod 2 14 pushes slider 15 to move in a straight line. Slider 15 can act as an extruder to extrude the hose.

[0121] The liquid inlet stop cam, the extrusion cam, and the working stop cam can all adopt the above structure.

[0122] Example 4

[0123] In this embodiment, such as Figure 7As shown, the transmission component is a cam 17, and the extrusion component is a swing rod 16. One end of the swing rod 16 is hinged to the body 1, and the other end of the swing rod 16 swings back and forth under the drive of the cam 17, periodically extruding the hose 18.

[0124] It is understood that this embodiment can press the hose by a combination of a cam and a swing rod. For the extrusion part, the transmission component can be a cam, and the extrusion block can be a swing rod. The swing rod presses the hose under the drive of the cam.

[0125] For the transmission components and pressing structure of the cut-off part, a combination of cam and pressure block or a combination of cam and swing rod can be used, without any restrictions.

[0126] Example 5

[0127] Unlike Embodiment 4, both the transmission component and the extrusion component can be rods, forming a linkage mechanism. One end of the extrusion component swings and reciprocates under the drive of the transmission component, periodically extruding the hose.

[0128] One end of the transmission rod is sleeved on the swing rod, and the transmission rod can slide on the swing rod. One end of the swing rod is hinged to the main body. The transmission rod rotates under the drive of the motor, and the other end of the swing rod oscillates back and forth under the drive of the transmission rod.

[0129] Example 6

[0130] Figure 8 This is a schematic flowchart illustrating a flow control method for a peristaltic pump provided in an embodiment of this specification. Figure 8 As shown, the flow control method for the squeeze-type peristaltic pump may include the following steps:

[0131] Step 801: Obtain the volume of the liquid to be filled and the maximum filling volume of the squeeze-type peristaltic pump;

[0132] Step 802: Determine the first rotation parameters of the first transmission component based on the volume of the liquid to be filled and the maximum volume of the liquid to be filled;

[0133] Step 803: Control the rotation of the first transmission component according to the first rotation parameter to complete the filling of one volume of liquid to be filled.

[0134] In this method, once the structure of the peristaltic pump, the motor speed, and the hose type are determined, the maximum filling volume can be determined, which can be obtained through experimental measurements. It should be noted that this method achieves flow control without altering the peristaltic pump structure.

[0135] The first transmission component can be understood as a transmission component that directly drives the working pressure block to squeeze the hose.

[0136] The first rotation parameter can be the rotation angle, rotation time, etc.

[0137] To control the flow rate of a peristaltic pump, the ratio of the volume of liquid to be filled to the maximum filling volume can first be determined. Then, the rotation parameters of the transmission components can be adjusted based on this ratio. For example, when the first transmission component is a cam, the first rotation parameter can be the cam's push-stroke angle. In this case, the cam's push-stroke angle is related to the filling volume of the peristaltic pump, and this relationship is determined by the shape of the cam.

[0138] Furthermore, step 802, which determines the first rotation parameter of the first transmission component based on the volume of the liquid to be filled and the maximum volume of the liquid to be filled, may specifically include:

[0139] Find the cam's push stroke angle corresponding to the volume of liquid to be filled from the aforementioned correlation.

[0140] For example, the filling volume and the angle of motion of the push stroke can be linearly proportional by controlling the shape of the cam. If the volume of liquid to be filled is half of the maximum filling volume, the cam can be stopped by controlling the rotation angle of the push stroke. In this way, half of the maximum filling volume of fluid can be obtained.

[0141] If the relationship between the filling volume and the push-stroke angle is not a simple linear proportional relationship, then for any given relationship, the relationship between the filling volume and the push-stroke angle can be determined experimentally and then stored. Once the volume of liquid to be filled is known, the corresponding push-stroke angle can be obtained by automatically querying the relationship, and then the first transmission component can be driven to rotate.

[0142] Optionally, the motion angle of the cam's push stroke is linearly related to the filling volume of the peristaltic pump; the first rotational parameter of the first transmission component is determined based on the volume of the liquid to be filled and the maximum filling volume, which may specifically include:

[0143] Determine the ratio between the volume of the liquid to be filled and the maximum volume of liquid to be filled;

[0144] The angle of motion of the cam during its push-stroke segment is determined based on the cam's push-stroke segment angle and the proportional relationship. Specifically, the angle of motion of the cam during its push-stroke segment is the product of the cam's push-stroke segment angle and the proportional relationship.

[0145] In some embodiments, the method may further include:

[0146] The second rotation parameter of the first transmission component is determined based on the first rotation parameter, wherein the first rotation parameter includes a time parameter;

[0147] The rotation of the second transmission component is controlled according to the second rotation parameter.

[0148] The second transmission component can be understood as the transmission component of a shut-off valve (which may include an inlet shut-off block and a outlet shut-off block) that uses a hose for shut-off. It can be a cam structure or a linear transmission mechanism.

[0149] Since the rotation angle of the first transmission component has changed, the rotation time of the first transmission component also changes, necessitating adjustment of the opening and closing times of the inlet and outlet stop blocks. These parameters can be determined in relation to the first rotation parameters.

[0150] It should be noted that the first transmission component and the second transmission component are driven by different power devices so that the first transmission component and the second transmission component can be controlled respectively according to the rotation parameters.

[0151] Optionally, determining the second rotation parameter of the first transmission component based on the first rotation parameter may specifically include:

[0152] The rotation time of the first spindle is determined based on the first rotation parameters;

[0153] The rotation time of the second spindle is determined based on the rotation time of the first spindle.

[0154] When both the first and second transmission components are camshafts, it is only necessary to determine the rotation time of the two shafts to complete the filling operation with different flow rates.

[0155] Specifically, the contour of the push stroke of the extrusion cam controls the motion law of the working pressure block, thereby controlling the extrusion process of the hose. The motion angle of the push stroke is β, and the contour of the push stroke is an equal flow discharge curve.

[0156] Assuming the cam rotates through a stroke angle β and discharges a liquid volume of V, if 0.5V of liquid needs to be discharged, the cam needs to move an angle of 0.5β. This means that discharging any proportion of liquid volume only requires rotating the cam through the corresponding stroke angle proportionally. During the drainage process, the inlet stop block closes the pipeline, the outlet stop block opens, and motor 2 rotates a certain angle according to the predetermined liquid requirement, discharging the required volume of fluid. Then, motor 2 stops, and simultaneously motor 1 restarts, causing camshaft 1 to control the outlet stop block to close the pipeline, thus stopping the drainage flow and achieving a quantitative discharge of fluid. By controlling the linkage between motors 1 and 2, the drainage process can be stopped in a timely manner, preventing excess liquid from being discharged.

[0157] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0158] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A peristaltic pump of the squeezing type, characterized in that, include: The body comprises a first transmission component, a second transmission component, an extrusion component, a stop block, and a limiting plate. The limiting plate is disposed on the upper end face of the body and is fixedly connected to the body. A hose is placed below the limiting plate. The extrusion member reciprocates under the drive of the first transmission component to press the hose; The shut-off block reciprocates under the drive of the second transmission component to shut off the inlet or outlet of the hose. The first and second transmission components are driven by different power devices. The extrusion peristaltic pump controls the power device to adjust the transmission angle of the first transmission component according to the flow requirements, thereby adjusting the extrusion height of the extruder on the hose, thus realizing the quantitative filling function with adjustable flow. The first transmission component includes a first main shaft and a first cam fixedly mounted on the first main shaft. The second transmission component includes a second main shaft and a second cam and a third cam fixedly mounted on the second main shaft at intervals. The phase angles corresponding to the highest peaks of the second cam and the third cam are different. The phase angles corresponding to the highest peaks of the first cam and the second cam are different. The phase angles corresponding to the highest peaks of the first cam and the third cam are also different. The first transmission component and the second transmission component are located on the same side of the hose, and an adapter block is provided to prevent interference between the first transmission component and the second transmission component.

2. The extrusion peristaltic pump as described in claim 1, characterized in that, The stop block includes a liquid inlet stop block and a liquid outlet stop block, which are disposed on both sides of the extruder.

3. The extrusion peristaltic pump as described in claim 2, characterized in that, The extrusion member reciprocates linearly under the drive of the first transmission component, and the stop block reciprocates linearly under the drive of the second transmission component.

4. The extrusion peristaltic pump as described in claim 3, characterized in that, The first transmission component and the second transmission component are either eccentric transmission mechanisms or linear transmission mechanisms.

5. The extrusion peristaltic pump as described in claim 4, characterized in that, The first spindle and the second spindle are arranged parallel to each other along the liquid transport direction, and the first cam is located between the second cam and the third cam along the liquid transport direction.

6. The extrusion peristaltic pump as described in claim 5, characterized in that, When the second spindle is positioned close to the hose, a first adapter block is provided between the first cam and the extruder, the second spindle is located above the first spindle, and the first adapter block passes through the second spindle.

7. The extrusion peristaltic pump as described in claim 5, characterized in that, When the first main shaft is positioned close to the hose, a second adapter block is provided between the second cam and the liquid inlet stop block, and a third adapter block is provided between the third cam and the liquid outlet stop block. The first main shaft is located above the second main shaft, and the second adapter block and the third adapter block pass through the first main shaft.

8. The extrusion peristaltic pump as described in claim 5, characterized in that, The first cam is used to drive the extruder to perform linear reciprocating motion, the second cam is used to drive the liquid inlet stop block to perform linear reciprocating motion, and the third cam is used to drive the liquid outlet stop block to perform linear reciprocating motion. The liquid inlet stop block and the liquid outlet stop block alternately maintain pressure on the hose.

9. The extrusion peristaltic pump as described in claim 5, characterized in that, The first cam, the second cam, or the third cam are all eccentric wheels, and the extrusion component is a pressure block.

10. The extrusion peristaltic pump as described in claim 1, characterized in that, The extrusion component is disposed inside the main body, and the main body is provided with a pressing block movable groove. A hose fixing part is provided at the groove opening end of the pressing block movable groove, and the limiting plate is detachably and fixedly connected to the groove opening end of the pressing block movable groove.

11. The extrusion peristaltic pump as described in claim 10, characterized in that, The hose fixing part is a groove on the body or a buckle that can be detachably installed on the body.

12. The extrusion peristaltic pump as described in claim 10, characterized in that, Multiple slide rails are provided on the inner side of the pressing block movable groove along the moving direction of the extruder.

13. The extrusion peristaltic pump as described in claim 2, characterized in that, The liquid inlet stop block and the liquid outlet stop block are clamping blocks.

14. The extrusion peristaltic pump as described in claim 13, characterized in that, The limiting plate is located near the end face of the hose, and an elastic material is provided at the position corresponding to the clamping block.

15. The extrusion peristaltic pump as described in claim 9, characterized in that, The extrusion component includes two or more sub-pressing blocks, or the liquid inlet stop block includes two or more sub-stop blocks, or the liquid outlet stop block includes two or more sub-stop blocks.

16. The extrusion peristaltic pump as described in claim 2, characterized in that, There are multiple limiting plates, which are respectively set for the liquid inlet stop block, the extrusion member and the liquid outlet stop block.

17. The extrusion peristaltic pump as described in claim 1, characterized in that, The extrusion member performs a oscillating reciprocating motion under the drive of the first transmission component.

18. The peristaltic pump as described in claim 17, characterized in that, The first transmission component is a cam, and the extrusion component is a swing rod. One end of the swing rod is hinged to the body, and the other end of the swing rod swings back and forth under the drive of the cam, periodically extruding the hose.

19. The extrusion peristaltic pump as described in claim 17, characterized in that, Both the first transmission component and the extrusion component are rods, forming a linkage mechanism. One end of the extrusion component oscillates and reciprocates under the drive of the first transmission component, periodically extruding the hose.

20. The extrusion peristaltic pump as described in claim 1, characterized in that, A spring is provided between the limiting plate and the extrusion member, and between the limiting plate and the stop block, and the spring is in a compressed state.

21. The extrusion peristaltic pump as described in claim 10, characterized in that, The extrusion peristaltic pump further includes a slide block fixedly connected to the main body, wherein the slide block and the main body form a slide groove for accommodating the limiting plate.

22. The extrusion peristaltic pump as described in claim 21, characterized in that, The groove block does not obstruct the hose fixing part.

23. The extrusion peristaltic pump as described in claim 22, characterized in that, There are two sliding blocks, and the sliding blocks are L-shaped.

24. A flow control method for a peristaltic pump, characterized in that, The method is applied to the peristaltic pump as described in claim 1, wherein the method is flow control performed without changing the structure of the peristaltic pump, and the method includes: Obtain the volume of the liquid to be filled and the maximum filling volume of the squeeze-type peristaltic pump; The first rotation parameter of the first transmission component is determined based on the volume of the liquid to be filled and the maximum volume of the liquid to be filled. The rotation of the first transmission component is controlled according to the first rotation parameter to complete the filling of one volume of liquid to be filled.

25. The method as described in claim 24, characterized in that, The first transmission component is a cam, and the first rotation parameter is the cam's push-stroke motion angle; the cam's push-stroke motion angle is related to the filling volume of the extrusion peristaltic pump, and the relationship is determined by the shape of the cam; The first rotation parameters of the first transmission component are determined based on the volume of the liquid to be filled and the maximum volume of the liquid to be filled, specifically including: Find the cam's push stroke angle corresponding to the volume of liquid to be filled from the aforementioned correlation.

26. The method as described in claim 25, characterized in that, The motion angle of the cam during its push stroke is linearly related to the filling volume of the peristaltic pump. The first rotation parameters of the first transmission component are determined based on the volume of the liquid to be filled and the maximum volume of the liquid to be filled, specifically including: Determine the ratio between the volume of the liquid to be filled and the maximum volume of liquid to be filled; The angle of motion of the cam during its push stroke is determined based on the cam's push stroke angle and the proportional relationship.

27. The method as described in claim 24, characterized in that, The method further includes: The second rotation parameter of the first transmission component is determined based on the first rotation parameter, wherein the first rotation parameter includes a time parameter; The rotation of the second transmission component is controlled according to the second rotation parameter.

28. The method as described in claim 24, characterized in that, The step of determining the second rotation parameter of the first transmission component based on the first rotation parameter specifically includes: The rotation time of the first spindle is determined based on the first rotation parameters; The rotation time of the second spindle is determined based on the rotation time of the first spindle.

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