Hose pump with volume compensation

Abstract

The invention relates to the technical field of peristaltic pumps, and provides a hose pump with volume compensation, the hose pump comprises a shell, a transmission pipe and a rotating frame, the middle of the shell is provided with a containing cavity, and the rotating frame is rotatably arranged in the containing cavity; at least two extrusion wheels are arranged on the rotating frame, the conveying pipe surrounds the rotating frame and is arranged between the extrusion wheels and the inner wall of the shell in an extrusion mode, the conveying pipe comprises a pressurization section and a pressure compensation section which are connected, the pressurization section is arranged on the upstream of the pressure compensation section, and the length of the pressurization section is larger than that of the pressure compensation section; and the extrusion wheels are movably arranged on the rotating frame, so that the pressure is increased when the two adjacent extrusion wheels compress liquid in the pressurization section into the pressure compensation section in the rotating process. The device has the advantages that the volume occupied by the extrusion wheel when the pressure compensation section releases liquid is compensated through the volume of the pressurization section, negative pressure is avoided, and therefore the pulsation phenomenon is avoided, and the liquid is released smoothly.

Description

Technical Field

[0001] The present invention relates to the field of peristaltic pumps, and more specifically, to a hose pump with volume compensation. Background Art

[0002] A peristaltic pump is a positive displacement pump, also known as a constant flow pump or a hose pump, used for pumping various fluids. Generally, a peristaltic pump is used as the circulating power source for liquids. The peristaltic pump includes a pump housing and a rotor. An installation cavity is provided on the pump housing, and the rotor is installed in the installation cavity. A pipeline accommodation area for accommodating a flexible pipeline is formed between the rotor and the installation cavity, and the pipeline accommodation area extends along the outer periphery of the rotor in a curved shape. The pipeline accommodation area is provided with a pipeline inlet passage and a pipeline outlet passage. One end of the flexible pipeline enters the pipeline accommodation area from the pipeline inlet passage, and the other end extends out of the pipeline accommodation area from the pipeline outlet passage. Rollers are arranged on the rotor at a certain angle around its own rotation center. When the rotor rotates, the rollers cyclically squeeze the pipeline, thereby pushing the liquid in the pipeline to flow forward.

[0003] The fact that the fluid passes through the inside of the flexible tube and does not contact any pump components means that the use of this pump is particularly advantageous for pumping sterile or sensitive fluids, because it prevents the sterility of the fluid inside the pump. Therefore, peristaltic pumps are particularly suitable for applications in industries such as food, chemical, medical, and pharmaceutical. In the prior art, liquid delivery devices such as beverage machines use peristaltic pumps to deliver liquids, and peristaltic pumps and their related components are also used in the medical field. In particular, surgical treatments require peristaltic pumps as power sources for pumping and supplying water for flushing and cooling.

[0004] However, there is a pulsation phenomenon during the operation of the hose pump. When the roller leaves the working surface at the outlet end of the transmission pipe, the liquid in the transmission pipe is instantaneously released. After the release is completed, the flow pressure at the outlet end instantaneously decreases, resulting in discontinuous liquid flow. Because of the pressure drop, a negative pressure is generated in the transmission pipe, causing the problem of back suction. Moreover, the larger the inner diameter of the transmission pipe, the larger the occupied volume of the roller on the hose, and the more obvious the pulsation phenomenon at the outlet end. The pulsation phenomenon will bring some negative impacts. For example, in the filling occasion, the pulsation phenomenon will cause inaccurate filling volume and serious splashing; during the operation of the dispensing machine, it is required that the glue transmission must be uniform, but the pulsation phenomenon will cause uneven coating; due to the pulsation phenomenon causing liquid oscillation, some physically sensitive liquids will be affected; the pulsation phenomenon makes it difficult to measure the flow rate of the peristaltic pump, and conventional flow meters cannot accurately measure it. Therefore, it is of great practical significance to study a hose pump that reduces the pulsation phenomenon or even achieves pulsation-free. Summary of the Invention

[0005] The present invention aims to overcome at least one defect (shortcoming) of the above prior art, and provides a hose pump with volume compensation to solve the pulsation problem of the hose pump.

[0006] The technical solution adopted by the present invention is to provide a hose pump with volume compensation, including a housing, a transmission pipe and a rotating frame. A receiving cavity is provided in the middle of the housing, and the rotating frame is rotatably arranged in the receiving cavity; at least two extrusion wheels are provided on the rotating frame, the transmission pipe is arranged around the rotating frame, and is extruded between the extrusion wheels and the inner wall of the housing. The transmission pipe includes a connected pressurizing section and a pressure compensation section. The pressurizing section is arranged upstream of the pressure compensation section, and the length of the pressurizing section is greater than the length of the pressure compensation section. The extrusion wheels are movably arranged on the rotating frame so that the pressure increases when the liquid in the pressurizing section is compressed into the pressure compensation section during the rotation of two adjacent extrusion wheels.

[0007] In this technical solution, the housing is a structure for supporting the transmission pipe, and the transmission pipe is arranged around and against the housing; the rotating frame can rotate relative to the housing and drive the extrusion wheels thereon to rotate together. The pressurizing section is arranged upstream of the pressure compensation section, that is, the pressurizing section is the part near the liquid inlet of the transmission pipe, and the pressure compensation section is the part of the transmission pipe near the liquid outlet of the transmission pipe. The liquid enters the transmission pipe from the liquid inlet, flows through the pressurizing section and the pressure compensation section in sequence, and then flows out from the liquid outlet.

[0008] The extrusion wheels are movably arranged on the rotating frame, so that the extrusion wheels can adapt to the distance between each part of the transmission pipe and the rotation center of the rotating frame, so that the extrusion wheels can closely adhere to and extrude the transmission pipe.

[0009] In the traditional transmission pipe, a constant pressure is set. When the liquid needs to be released, the extrusion wheel near the liquid outlet is loosened, and the part of the transmission pipe originally occupied by the extrusion wheel generates negative pressure, resulting in liquid backflow. In this application, the length of the pressurizing section is greater than the length of the pressure compensation section. When two adjacent extrusion wheels extrude the pressurizing section, the internal volume of the transmission pipe between the two extrusion wheels is larger. When two adjacent extrusion wheels rotate to the pressure compensation section, as the transmission pipe between the two extrusion wheels becomes shorter, its corresponding internal volume gradually decreases and the internal pressure gradually increases. When the downstream extrusion wheel is released, since the increased pressure in the pressurizing section compensates for the negative pressure that would originally be generated, the internal pressure of the transmission pipe increases, thus avoiding liquid backflow. That is, this solution compensates for the volume occupied by the extrusion wheel when the pressure compensation section releases liquid through the volume of the pressurizing section, avoids the generation of negative pressure, and thus avoids the generation of pulsation phenomena, making the liquid release smooth.

[0010] Further, the distance between the pressure compensation section and the rotation center of the rotating frame is the same, and the distance between the pressurizing section and the rotation center of the rotating frame gradually decreases in the direction from upstream to downstream.

[0011] In this technical solution, the pressure compensation section of the transmission pipe is an arc section, the rotation center of the rotating frame is located at the center of the circle corresponding to the arc section, the pressurization section is a gradually changing curve deviating from the circle where the arc section is located, and it gradually approaches the rotation center of the rotating frame from the end far from the pressure compensation section to the end close to the pressure compensation section. The setting of the gradually changing curve can make the internal volume of the transmission pipe between two adjacent extrusion wheels gradually decrease and the pressure gradually increase as it rotates. When it completely rotates to the pressure compensation section set as an arc, the internal pressure reaches the maximum.

[0012] It can be understood that in this solution, the length of the transmission pipe is extended through the setting of the curve of the transmission pipe, so as to perform volume compensation. And the gradual change setting makes the pressure inside the transmission pipe increase gradually, improving the stability of the pressure change and ensuring the effect of volume compensation. The curvature of the curve of the pressurization section can be set according to actual needs. The more curved it is, the greater the pressurization, and more volume occupied by the extrusion wheels in the pressure compensation section can be compensated.

[0013] In actual operation, among two adjacent extrusion wheels, as long as the upstream extrusion wheel is located in the pressurization section, the transmission pipe between the two extrusion wheels is in the pressurization process during movement. When both wheels are located in the pressure compensation section, the movement process is a constant pressure process until the downstream extrusion wheel disengages from the transmission pipe to release the liquid.

[0014] Further, the extrusion wheel is movably connected to the rotating frame through an extension structure, and the rotating frame is provided with an elastic mechanism for driving the extension structure to drive the extrusion wheel to extend in a direction away from the center of the circle, so that the extrusion wheel presses on the transmission pipe. The elastic mechanism pops out by extending to drive the extension structure, driving the extrusion wheel on the extension structure to pop out and press on the transmission pipe.

[0015] Further, the extension structure is a rocker arm, one end of the rocker arm is rotatably connected to the rotating frame, and the other end of the rocker arm is rotatably connected to the extrusion wheel.

[0016] In this technical solution, one end of the elastic mechanism is connected to the rocker arm and the other end is connected to the rotating frame. The elastic mechanism is preferably a spring. When the spring extends, the rocker arm opens, and when the spring contracts, the rocker arm retracts towards the rotating frame.

[0017] If the extension structure expands radially, the transmission pipe between two adjacent extrusion wheels can only rely on the bending and extension of the transmission pipe; in this solution, the distances between the transmission pipe and the rotation center of the rotating frame are different, and the unfolding degrees of the rocker arms are also different. Among two adjacent extrusion wheels, the larger the upstream extrusion wheel unfolds, the longer the length of the transmission pipe between the two extrusion wheels, and the better the pressurization effect. In this way, not only the length of the transmission part is increased by the degree of fullness of the transmission pipe, but also the length of the transmission part is increased by the unfolding of the extrusion wheels, so that the pressurization effect can be improved without excessive bending of the transmission pipe, the overall volume can be reduced, and the structure is compact. In addition, the bending degree of the transmission pipe is reduced, the extension degree of the elastic mechanism can be reduced, the elastic requirement for the elastic mechanism is reduced, and the production cost is reduced.

[0018] Further, the inner wall of the housing includes a buffer section, the two ends of the buffer section are respectively a first end and a second end, the first end is connected to the arc section, the second end is connected to the extension section, and from the first end to the second end on the buffer section, the distance from it to the rotation center of the rotating frame gradually increases.

[0019] In this technical solution, after the extrusion wheel disengages from the pressure compensation section, it enters the buffer section of the housing and directly presses the inner wall of the housing. After disengaging from the buffer section, it enters the pressurization section and presses the transmission pipe. When the extrusion wheel rotates from the first end to the second end, as the distance from the rotation center of the rotating frame gradually increases, the elastic mechanism gradually extends. In this way, when it rotates to the end where the pressurization section is connected to the second end, the unfolding degree of the extension structure is the largest, so that after the extrusion wheel comes out of the pressure compensation section and before it enters the pressurization section again, the extension structure gradually unfolds, ensuring that the entire operation process is smoother and improving the stability. Preferably, the maximum distance between the buffer section and the rotation center of the rotating frame is the same as the maximum distance between the buffer section and the rotation center of the rotating frame, so that the two sections are better connected and the operation of the extrusion wheel is smoother.

[0020] Further, a movable internal pressing component is provided on the housing. The internal pressing component includes a plurality of pressing mechanisms. One side of the pressing mechanism facing the transmission pipe forms a pressing surface. An abutting surface is provided on the housing. A receiving space for the transmission pipe is formed between the pressing surface and the abutting surface. The extrusion wheel acts on the transmission pipe through the pressing mechanism.

[0021] In this technical solution, the internal pressing component serves as an intermediate force-receiving component for the pressing wheel component to press the transmission pipe, that is, the pressing wheel component applies force to the internal pressing component, and the internal pressing component presses the transmission pipe.

[0022] In the existing peristaltic pump, the pressure wheel assembly rolls on the transmission pipe, and the frictional force generated on the transmission pipe will cause relatively large wear to the transmission pipe, generate heat, shorten the service life of the transmission pipe, and the utilization rate of the driving device in the pressure wheel assembly is also low. In the present technical solution, when the pressing mechanism presses the transmission pipe, the surface in contact with the transmission pipe is the pressing surface, and the surface on the housing in contact with the transmission pipe is the abutting surface. When the pressing mechanism presses, the pressing surface and the abutting surface cooperate to squeeze the transmission pipe. The pressure wheel assembly applies pressure to the pressing mechanism, and the pressing mechanism squeezes the transmission pipe. With such a setting, when the pressure wheel assembly applies pressure, what it contacts is the pressing mechanism, and the frictional force is generated between the pressure wheel assembly and the pressing mechanism. The force received by the transmission pipe is mainly the pressing force from the pressing mechanism, and the direction of this pressing force is perpendicular to the tangent of the pressing point. In this way, the large mechanical force received by the transmission pipe is the pressing force for squeezing the pipe, reducing wear, prolonging the service life of the transmission pipe, and reducing the maintenance cost of the peristaltic pump; in addition, heat generation due to friction is avoided, further protecting the transmission pipe, and improving the utilization rate of the driving device in the pressure wheel assembly. Moreover, since the frictional force received by the transmission pipe is greatly reduced and can be almost ignored, it is not easy to be driven and displaced during the extrusion and infusion process, improving the stability of the peristaltic pump. Moreover, if the extrusion wheel directly acts on the transmission pipe, it will affect the internal volume of the part of the transmission pipe between two adjacent extrusion wheels. In the present solution, the extrusion wheel directly acts on the pressing mechanism, and the squeezing force received by the transmission pipe is perpendicular to the direction of the tangent of the squeezing point, enabling more accurate control of the internal volume of the transmission pipe between two adjacent extrusion wheels, thereby ensuring the control of the internal pressure of the transmission pipe and enabling the volume compensation to be smoothly achieved.

[0023] Further, before the pressing mechanism is affected by the pressure wheel assembly, the distance between the pressing surface and the abutting surface is less than the height of the transmission pipe to form a pre-pressure on the transmission pipe.

[0024] Further, the pressing mechanism includes a connecting arm and a pressing plate. The connecting arm includes a rotating part and a connecting part. The rotating part is connected to the pressing plate through the connecting part. The rotating part is rotatably connected to the housing, and the surface of the pressing plate in contact with the transmission pipe is the pressing surface.

[0025] Further, the rotating parts of the pressing mechanism are all connected to the same side of the housing. With such a setting, it is convenient to take out the transmission pipe.

[0026] Further, the rotating parts of two adjacent pressing mechanisms are respectively connected to both sides of the housing. With such a setting, interference between two adjacent pressing mechanisms during operation can be avoided.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) The present invention compensates for the volume occupied by the squeezing wheel when the pressure compensation section releases liquid through the volume of the pressurizing section. The pressure increase during the operation of the pressurizing section is given to the pressure compensation section, compensating for the negative pressure generated during liquid release, thereby avoiding the generation of pulsation phenomena and enabling smooth liquid release.

[0029] (2) The squeezing wheel of the present invention directly acts on the pressing mechanism, and the extrusion force received by the transmission pipe is perpendicular to the tangent direction of the extrusion point, enabling more accurate control of the internal volume of the transmission pipe between two adjacent squeezing wheels, thereby ensuring the control of the internal pressure of the transmission pipe and enabling smooth realization of volume compensation. Brief Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the hose pump with two squeezing wheels of the present invention.

[0031] Figure 2 It is a schematic structural diagram of the hose pump with three squeezing wheels of the present invention.

[0032] Figure 3 It is a schematic structural diagram of the rotating frame, the extension structure, and the elastic mechanism of the present invention.

[0033] Figure 4 It is a schematic structural diagram of the first pressing mechanism of the present invention.

[0034] Figure 5 It is a schematic structural diagram of the second pressing mechanism of the present invention.

[0035] Figure 6 It is a top view of the first pressing mechanism of the present invention.

[0036] Figure 7 It is a top view of the second pressing mechanism of the present invention.

[0037] Reference Numerals: housing 100, buffer section 110, first end 111, second end 112, transmission pipe 200, pressurizing section 210, pressure compensation section 220, rotating frame 300, squeezing wheel 310, extension structure 320, elastic mechanism 330, pressing mechanism 400, pressing plate 410, rotating part 420, connecting part 430, first pressing mechanism 440, second pressing mechanism 450. Detailed Description of the Invention

[0038] The drawings of the present invention are only for illustrative purposes and should not be construed as limitations on the present invention. For better illustration of the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0039] Embodiment 1

[0040] Reference Figures 1 to 7 In this embodiment, a hose pump with volume compensation is provided, which includes a housing 100, a transmission pipe 200 and a rotating frame 300. A receiving cavity is provided in the middle of the housing 100, and the rotating frame 300 is rotatably arranged in the receiving cavity; at least two squeezing wheels 310 are provided on the rotating frame 300. The transmission pipe 200 is arranged around the rotating frame 300 and is squeezed between the squeezing wheel 310 and the inner wall of the housing 100. The transmission pipe 200 includes a connected pressurizing section 210 and a pressure compensation section 220. The pressurizing section 210 is arranged upstream of the pressure compensation section 220, and the length of the pressurizing section 210 is greater than the length of the pressure compensation section 220. The squeezing wheel 310 is movably arranged on the rotating frame 300 so that the pressure increases when the liquid in the pressurizing section 210 is compressed into the pressure compensation section 220 during the rotation of two adjacent squeezing wheels 310.

[0041] A motor is provided in the rotating frame 300 to drive the rotating frame 300 to rotate. The housing 100 is a structure for supporting the transmission pipe 200, which is annular and includes an inner wall, a front side and a rear side; the transmission pipe 200 is arranged around and against the housing 100; the rotating frame 300 can rotate relative to the housing 100 and drive the squeezing wheel 310 thereon to rotate together. The pressurizing section 210 is arranged upstream of the pressure compensation section 220, that is, the pressurizing section 210 is the part near the liquid inlet of the transmission pipe 200, and the pressure compensation section 220 is the part of the transmission pipe 200 near the liquid outlet of the transmission pipe 200. The liquid enters the transmission pipe 200 from the liquid inlet, flows through the pressurizing section 210 and the pressure compensation section 220 in sequence, and then flows out from the liquid outlet.

[0042] The squeezing wheel 310 is movably arranged on the rotating frame 300, so that the squeezing wheel 310 can adapt to the length of each part of the transmission pipe 200, and the squeezing wheel 310 can be tightly attached to and squeeze the transmission pipe 200.

[0043] The traditional transfer tube 200 has a constant pressure setting. When the liquid is to be released, the squeezing wheel 310 near the liquid outlet is loosened, and a negative pressure is generated in the part of the transfer tube 200 originally occupied by the squeezing wheel 310, resulting in liquid backflow. In the present application, the length of the pressurizing section 210 is greater than the length of the pressure compensation section 220. When two adjacent squeezing wheels 310 squeeze the pressurizing section 210, the internal volume of the transfer tube 200 between the two squeezing wheels 310 is larger. When two adjacent squeezing wheels 310 rotate to the pressure compensation section 220, as the transfer tube 200 between the two squeezing wheels 310 becomes shorter and shorter, its corresponding internal volume gradually decreases, and the internal pressure gradually increases. When the downstream squeezing wheel 310 is released, since the increased pressure in the pressurizing section 210 compensates for the negative pressure that would originally be generated, the internal pressure of the transfer tube 200 increases, thus avoiding liquid backflow. That is, in this solution, the volume of the pressurizing section 210 compensates for the volume occupied by the squeezing wheel 310 when the pressure compensation section 220 releases the liquid, avoiding the generation of negative pressure, thereby avoiding the generation of pulsation phenomena and making the liquid release smooth.

[0044] The distance between the pressure compensation section 220 and the rotation center of the rotating frame 300 is the same, and the distance between the pressurizing section 210 and the rotation center of the rotating frame 300 gradually decreases in the direction from upstream to downstream.

[0045] The pressure compensation section 220 of the transfer tube 200 is an arc section, and the rotation center of the rotating frame 300 is located at the center of the circle corresponding to this arc section. The pressurizing section 210 is a gradient curve deviating from the circle where the arc section is located, and gradually approaches the rotation center of the rotating frame 300 in the direction from the end far from the pressure compensation section 220 to the end close to the pressure compensation section 220. The setting of the gradient curve can make the internal volume of the transfer tube 200 between two adjacent squeezing wheels 310 gradually decrease and the pressure gradually increase with rotation. When it completely rotates to the pressure compensation section 220 set as an arc, the internal pressure reaches the maximum.

[0046] It can be understood that in this solution, the volume compensation is achieved by setting the curve of the transfer tube 200, which elongates the transfer tube 200. Moreover, the gradient setting makes the pressure inside the transfer tube 200 increase gradually, improving the stability of the pressure change and ensuring the effect of volume compensation. The curve bending degree of the pressurizing section 210 can be set according to actual needs. The more curved it is, the greater the pressurization, and more volume occupied by the squeezing wheel 310 in the pressure compensation section 220 can be compensated.

[0047] Specifically, the inner wall of the housing 100 can be set as an arc section connected to a gradient curve. The pressure compensation section 220 of the transfer tube 200 is arranged along and abuts against the arc section, and the pressurizing section 210 is arranged along and abuts against the gradient curve.

[0048] Exemplarily, the pressure compensation section 220 and the pressurization section 210 are arc-connected. Preferably, the closest distance between the pressurization section 210 and the rotation center of the rotating frame 300 is the same as the distance between the pressure compensation section 220 and the rotation center. If the above-mentioned closest distance is greater than or less than the corresponding distance of the pressure compensation section 220, the transmission pipe 200 will form a stepped shape, and it is easy to damage the transmission pipe 200 when the pressing wheel 310 presses against the step; moreover, the stepped setting will form a certain obstruction to the rotation of the pressing wheel 310, affecting the rotation speed and reducing the liquid transmission efficiency; in addition, when the liquid transmitted between the two pressing wheels 310 rotates to the step, the stepped setting will affect the internal volume of the transmission pipe 200 at this section, causing pressure fluctuations, thereby resulting in unstable pressure. Therefore, setting the above-mentioned closest distance to be equal to the closest distance of the pressure compensation section 220 can reduce the probability of maintenance, improve the transmission efficiency, and at the same time ensure the stability of the internal pressure of the transmission pipe 200, enabling the volume compensation to be smoothly achieved, thereby successfully avoiding the generation of pulsation phenomena.

[0049] The pressing wheel 310 is movably connected to the rotating frame 300 through an extension structure 320. The rotating frame 300 is provided with an elastic mechanism 330 for driving the extension structure 320 to drive the pressing wheel 310 to extend away from the center of the circle, so that the pressing wheel 310 presses on the transmission pipe 200.

[0050] The elastic mechanism 330 pops out by extending to drive the extension structure 320, driving the pressing wheel 310 on the extension structure 320 to pop out and press on the transmission pipe 200.

[0051] Preferably, the extension structure 320 is a rocker arm. One end of the rocker arm is rotatably connected to the rotating frame 300, and the other end of the rocker arm is rotatably connected to the pressing wheel 310.

[0052] One end of the elastic mechanism 330 is connected to the rocker arm, and the other end is connected to the rotating frame 300. The elastic mechanism 330 is preferably a spring. When the pressing wheel 310 moves from the end of the pressurization section 210 that is farther from the rotation center to the end of the pressurization section 210 that is closer to the rotation center, the pressing wheel 310 gradually contracts towards the rotating frame 300, and the spring is compressed. During this process, the pressing wheel 310 will also get closer and closer to the pressing wheel 310 downstream of it, compressing the space between the two wheels to achieve pressurization. Specifically, both the rotating frame 300 and the rocker arm are provided with recesses. One end of the spring is connected to the recess in the rotating frame 300, and the other end is connected to the recess in the rocker arm. The recess plays a role in limiting the spring. The connection can be a fixed connection or a detachable connection. More specifically, for example, abutting connection.

[0053] If the extension structure is radially telescopic, the transfer pipe 200 between two adjacent squeezing wheels 310 can only rely on the bending and extension of the transfer pipe 200; in this solution, the distances between the transfer pipe 200 and the rotation center of the rotating frame 300 are different, and the unfolding degrees of the swing arms are also different. Among two adjacent squeezing wheels 310, the more the upstream squeezing wheel 310 unfolds, the longer the length of the transfer pipe 200 between the two squeezing wheels 310, and the better the pressurization effect. In this way, not only the length of the transfer part is increased by the degree of completion of the transfer pipe 200, but also the length of the transfer part is increased by the unfolding of the squeezing wheels 310, so that the pressurization effect can be improved without excessive bending of the transfer pipe 200, the overall volume can be reduced, and the structure is compact. In addition, the bending degree of the transfer pipe 200 is reduced, the extension degree of the elastic mechanism 330 can be reduced, the elastic requirement for the elastic mechanism 330 is lowered, and the production cost is reduced.

[0054] The number of the squeezing wheels 310 on the rotating frame 300 can be 2, 3, 4, etc. Preferably, the larger the central angle corresponding to the pressure compensation section 220, the smaller the radius of the pressure compensation section 220. In this way, it is convenient to set the pressurization section 210, and its curvature does not need to be too large to make its length greater than that of the pressurization section 210.

[0055] Reference Figure 1 , Exemplarily, there are two squeezing wheels 310 provided on the rotating frame 300, the central angle corresponding to the pressure compensation section 220 is 180°, one end of the swing arm connected to the rotating frame 300 is defined as the rotating shaft end, the rotating shaft ends are on the same circle and divide the circle equally, and the center of this circle is the same as the center of the rotating frame 300, that is, the included angle between the connecting lines of two adjacent rotating shaft ends and the rotation center of the rotating frame 300 is also 180°. The included angles between the connecting lines of the two ends of the pressurization section 210 and the rotation center of the rotating frame 300 are 140° to 160°, for example, 145°, 150° or 155°, etc. The size of this included angle can be set according to the actual volume compensation requirement. The larger this included angle is, the longer the pressurization section is, and the greater the pressure supplemented by the volume compensation section is.

[0056] Reference Figure 2 , Exemplarily, there are three squeezing wheels 310 provided on the rotating frame 300, the central angle corresponding to the pressure compensation section 220 is 120°, one end of the swing arm connected to the rotating frame 300 is defined as the rotating shaft end, the rotating shaft ends are on the same circle and divide the circle equally, and the center of this circle is the same as the center of the rotating frame 300, that is, the included angle between the connecting lines of two adjacent rotating shaft ends and the rotation center of the rotating frame 300 is also 120°. The included angles between the connecting lines of the two ends of the pressurization section 210 and the rotation center of the rotating frame 300 are 125° to 140°, for example, 130°, 135° or 140°.

[0057] The inner wall of the housing 100 includes a buffer section 110. The two ends of the buffer section 110 are respectively a first end 111 and a second end 112. The first end 111 is connected to the arc section, and the second end 112 is connected to the extension section. From the first end 111 to the second end 112 on the buffer section 110, the distance from its rotation center of the rotating frame 300 gradually increases.

[0058] After the extrusion wheel 310 disengages from the pressure compensation section 220, it enters the buffer section 110 of the housing 100, directly extruding the inner wall of the housing 100. After disengaging from the buffer section 110, it enters the pressure boosting section 210 and extrudes the transmission pipe 200. When the extrusion wheel 310 rotates from the first end 111 to the second end 112, as the distance from the rotation center of the rotating frame 300 gradually increases, the elastic mechanism 330 gradually extends. Thus, when rotating to the end where the pressure boosting section 210 is connected to the second end 112, the unfolding degree of the outward extension structure 320 is the largest, so that during the process from the extrusion wheel 310 coming out of the pressure compensation section 220 to re-entering the pressure boosting section 210, the outward extension structure 320 gradually unfolds, ensuring a smoother overall operation process and improving stability. Preferably, the maximum distance between the buffer section 110 and the rotation center of the rotating frame 300 is the same as the maximum distance between the buffer section 110 and the rotation center of the rotating frame 300, so as to better connect the two sections and make the operation of the extrusion wheel 310 more smooth.

[0059] An active inner pressing assembly is provided on the housing 100. The inner pressing assembly includes a plurality of pressing mechanisms 400. A pressing surface is formed on one side of the pressing mechanism 400 facing the transmission pipe 200. An abutting surface is provided on the housing 100. A receiving space for the transmission pipe 200 is formed between the pressing surface and the abutting surface. The extrusion wheel 310 acts on the transmission pipe 200 through the pressing mechanism 400.

[0060] The inner pressing assembly serves as an intermediate force-receiving assembly for the pressing wheel assembly to press the transmission pipe 200, that is, the pressing wheel assembly applies force to the inner pressing assembly, and the inner pressing assembly presses the transmission pipe 200.

[0061] In the existing peristaltic pump, the pressing wheel assembly rolls on the transmission pipe 200, and the frictional force generated on the transmission pipe 200 will cause relatively large wear on the transmission pipe 200, generate heat, shorten the service life of the transmission pipe 200, and the utilization rate of the driving device in the pressing wheel assembly is also low. In the present technical solution, when the pressing mechanism 400 presses the transmission pipe 200, the surface in contact with the transmission pipe 200 is the pressing surface, and the surface on the housing 100 in contact with the transmission pipe 200 is the abutting surface. When the pressing mechanism 400 presses, the pressing surface and the abutting surface cooperate to squeeze the transmission pipe 200. The pressing wheel assembly applies pressure to the pressing mechanism 400, and the pressing mechanism 400 squeezes the transmission pipe 200. With such a setting, when the pressing wheel assembly applies pressure, what it contacts is the pressing mechanism 400, and the frictional force is also generated between the pressing wheel assembly and the pressing mechanism 400. The force received by the transmission pipe 200 is mainly the pressing force from the pressing mechanism 400, and the direction of this pressing force is perpendicular to the tangent of the pressing point. This makes the large mechanical force received by the transmission pipe 200 be the pressing force for squeezing the pipe, reducing wear, extending the service life of the transmission pipe 200, and reducing the maintenance cost of the peristaltic pump; in addition, heat generation due to friction is avoided, further protecting the transmission pipe 200, and improving the utilization rate of the driving device in the pressing wheel assembly. Moreover, since the frictional force received by the transmission pipe 200 is greatly reduced and can be almost ignored, it is not easily driven to cause displacement during the process of squeezing and infusing, improving the stability of the peristaltic pump. Furthermore, if the pressing wheel 310 directly presses on the transmission pipe 200, it will affect the internal volume of the part of the transmission pipe 200 between two adjacent pressing wheels 310. In this solution, the pressing wheel 310 directly acts on the pressing mechanism 400, and the squeezing force received by the transmission pipe 200 is perpendicular to the direction of the tangent of the squeezing point, enabling more accurate control of the internal volume of the transmission pipe 200 between two adjacent pressing wheels 310, thereby ensuring the control of the internal pressure of the transmission pipe 200 and enabling the volume compensation to be successfully achieved.

[0062] Before the pressing mechanism 400 is affected by the pressing wheel assembly, the distance between the pressing surface and the abutting surface is less than the height of the transmission pipe 200 to form pre-pressure on the transmission pipe 200.

[0063] The height of the transfer pipe 200 here refers to the original height when it is not subjected to any pressing. When the pipe is a circular pipe, it can be understood as the diameter of the cross-section of the transfer pipe 200. Since in this technical solution, the transfer pipe 200 is pressed rather than rolled, when the transfer pipe 200 with a circular cross-section is pressed, during the process of changing from a circle to an oval, the cross-sectional area of the transfer pipe 200 changes very little, and the amount of decrease in the flow rate inside the transfer pipe 200 is very small, which can be understood as the change in the ineffective pressing area. And when pressing from the oval to the state where the transfer pipe 200 is completely flattened and closed, as long as a little pressing force causes the cross-section of the transfer pipe 200 to deform, the change in its cross-sectional area will be very large, that is, the change efficiency of this part of the area is very high.

[0064] Therefore, in this technical solution, before the pressing wheel assembly applies pressure to the pressing mechanism 400, the pressing mechanism 400 will apply a certain pressure to the transfer pipe 200, so that the transfer pipe 200 is in a slightly pressed state, and it can be slightly pressed until the cross-section of the transfer pipe 200 is between a circle and an oval or is an oval. Such a setting makes the change in the ineffective area of the transfer pipe 200 basically completed during the pre-pressing, and when the driving device in the pressing wheel assembly drives the transfer pipe 200 to be pressed, the pressed area is all effective area change, improving the utilization rate of the driving device in the pressing wheel assembly.

[0065] The pressing mechanism 400 includes a connecting arm and a pressing plate 410. The connecting arm includes a rotating part 420 and a connecting part 430. The rotating part 420 is connected to the pressing plate 410 through the connecting part 430. The rotating part 420 is rotatably connected to the housing 100, and the surface of the pressing plate 410 in contact with the transfer pipe 200 is the pressing surface.

[0066] Exemplarily, the rotating parts 420 of the pressing mechanism 400 are all connected to the same side of the housing 100, and can be connected to the front side of the housing 100 or the rear side of the housing 100. Such a setting facilitates the removal of the transfer pipe 200. Further, the pressing mechanism 400 includes a first pressing mechanism 440 and a second pressing mechanism 450. The connecting part 430 of the first pressing mechanism 440 is a straight arm, and the connecting part 430 of the second pressing mechanism 450 is a bent arm, which is bent from the connecting part 430 towards the pressing plate 410 to form an avoidance space. The first pressing mechanism 440 and the second pressing mechanism 450 are arranged alternately.

[0067] Embodiment 2

[0068] This embodiment provides a hose pump with volume compensation, which is similar in structure to Embodiment 1, the difference being that: the rotating parts 420 of two adjacent pressing mechanisms 400 are respectively connected to both sides of the housing 100, that is, distributed on the front side and the rear side of the housing 100. Such a setting can avoid mutual interference during the operation of two adjacent pressing mechanisms 400.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A hose pump with volume compensation, comprising a housing, a transmission pipe and a rotating frame, wherein a receiving chamber is provided in the middle of the housing, and the rotating frame is rotatably arranged in the receiving chamber; at least two extrusion wheels are arranged on the rotating frame, and the transmission pipe is arranged around the rotating frame and extruded between the extrusion wheels and the inner wall of the housing, characterized in that: The transmission pipe includes a connected boosting section and a pressure compensation section. The boosting section is arranged upstream of the pressure compensation section. The length of the boosting section is greater than the length of the pressure compensation section. The extrusion wheels are movably arranged on the rotating frame so that the pressure increases when two adjacent extrusion wheels compress the liquid in the boosting section into the pressure compensation section during rotation.

2. The hose pump with volume compensation according to claim 1, characterized in that: The pressure compensation section is at the same distance from the rotation center of the rotating frame, and the pressure boosting section is at a gradually decreasing distance from the rotation center of the rotating frame in a direction from upstream to downstream.

3. The hose pump with volume compensation according to claim 2, characterized in that: The extrusion wheel is movably connected to the rotating frame through an extension structure. The rotating frame is provided with an elastic mechanism for driving the extension structure to drive the extrusion wheel to extend in a direction away from the center of the circle, so that the extrusion wheel is squeezed on the transmission tube.

4. The hose pump with volume compensation according to claim 3, characterized in that: The extension structure is a rocker arm, one end of the rocker arm is rotatably connected to the rotating frame, and the other end of the rocker arm is rotatably connected to the extrusion wheel.

5. The hose pump with volume compensation according to claim 2, characterized in that: The inner wall of the shell includes a buffer section, and the two ends of the buffer section are respectively a first end and a second end, the first end is connected to the arc section, and the second end is connected to the extension section. From the first end to the second end of the buffer section, the distance between it and the rotation center of the rotating frame gradually increases.

6. The hose pump with volume compensation according to any one of claims 1 to 5, characterized in that: The shell is provided with a movable internal pressing assembly, which includes a plurality of pressing mechanisms. The pressing mechanism forms a pressing surface facing one side of the transmission tube. The shell is provided with an abutment surface. A accommodating space for the transmission tube is formed between the pressing surface and the abutment surface. The extrusion wheel acts on the transmission tube through the pressing mechanism.

7. The hose pump with volume compensation according to claim 6, characterized in that: Before the pressing mechanism is acted upon by the pressing wheel assembly, the distance between the pressing surface and the abutting surface is smaller than the height of the transmission tube, so as to form a pre-pressure on the transmission tube.

8. The hose pump with volume compensation according to claim 5, characterized in that: The pressing mechanism includes a connecting arm and a pressing plate, the connecting arm includes a rotating part and a connecting part, the rotating part is connected to the pressing plate through the connecting part, the rotating part is rotatably connected to the shell, and the side of the pressing plate in contact with the transmission tube is a pressing surface.

9. The hose pump with volume compensation according to claim 7, characterized in that: The rotating parts of the pressing mechanism are all connected to the same side of the shell.

10. The hose pump with volume compensation according to claim 7, characterized in that: The rotating parts of two adjacent pressing mechanisms are respectively connected to two sides of the shell.

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