Peristaltic pump and fluid transfer methods

Abstract

Peristaltic pump (1), comprising: a plurality of press sections (18), wherein the press sections (18) are spaced apart from one another in a direction of rotation and are provided for a rotating body (15) which is rotated by a drive unit (19); and a hose (20) which conveys a fluid, wherein the hose (20) is provided on an outer circumferential side of the rotating body (15), wherein the peristaltic pump (1) comprises a control and / or regulating unit (26) which rotates the rotating body (15) in a conveying direction, after rotating the rotating body (15) against the conveying direction until the rotating body (15) reaches a predetermined angle in order to restore a region (21) of the hose (20) on which the press section (18) presses on a side furthest upstream in the conveying direction, by increasing the pressure inside the hose (20), together with a movement against the conveying direction of the press section (18) which is adjacent to a side downstream in the conveying direction.

Description

Background of the invention; Field of the invention

[0001] The disclosure relates to a peristaltic pump that pumps a fluid and a fluid pumping method. Description of the related technique

[0002] In a conventionally known peristaltic pump, a pressing element, such as a roller, is provided for a rotating body, i.e., a rotor, which is driven by a drive unit such as a motor. The pressing element is moved by the rotation of the rotor, thereby pumping or transporting fluid. A problem with the peristaltic pump designed as described above was that if the pump was stopped for a long time, the section of the hose on which the pressing element had been pressed would not recover its shape well, making it difficult to perform a self-priming function, i.e., to draw fluid from a source side.Patent document 1, mentioned below, describes, for example, a peristaltic pump configured such that an adhesion-prevention element, such as a linear element or a band-like element, is inserted into the hose to separate the inner surfaces of a sealed section of the hose caused by a compression element after the compression force has been removed. Patent document 2, mentioned below, discloses a peristaltic pump in which a guide plate, which rotates integrally with a pump drive shaft, has the function of releasing a compression state of a hose caused by a compression roller when the roller is not in use.The peristaltic pump is designed such that the guide plate has a guide hole in the form of an elongated hole, which holds the press roller movable in a hose compression state or in a released state, and when not in use, the press roller is moved along the guide hole by moving the pump drive shaft in the reverse direction, so that the pressure-released state occurs.

[0003] DE 10 2012 022 836 B3 describes a peristaltic pump with a pump hose and at least one pinch element movable by means of a pump drive. During pumping operation, the pinch element is cyclically movable along the pump hose in such a way that the hose is pinched and a medium contained within the pump hose is pumped. The peristaltic pump includes a synchronization system by which the movements and / or positions of the at least one pinch element and a pig located in the pump hose can be synchronized in such a way that no positional collision occurs at a collision point between the pinch element and the pig when the pump drive is active.

[0004] DE 10 2013 210 548 A1 describes a peristaltic pump for conveying a fluid medium through a hose, comprising a saddle with an arc-shaped inner surface and a rotor rotatably arranged in the saddle about an axis of rotation, with several hose pinching devices arranged at least temporarily opposite the inner surface of the saddle and distributed angularly about the axis of rotation for externally acting upon a hose to be arranged between the inner surface of the saddle and the rotor, such that when the rotor rotates, a local narrowing of the cross-sectional area of ​​the hose caused by externally acting upon the hose by a hose pinching device is movable along the inner surface of the saddle in order to convey the medium in the hose.

[0005] DE 10 2013 101 412 A1 describes a method for operating a device for providing a liquid additive, comprising at least one suction point for extracting liquid additive from a tank, a valve-free delivery line running from the suction point to a delivery unit, and a valve-free positive displacement pump, wherein the positive displacement pump is configured to pump the liquid additive from the tank via the suction point along the delivery line to the delivery unit. Citation list of patent documents Patent document 1: Japanese unexamined patent application Publication number JP H11 - 82 324 A Patent document 2: Japanese patent number JP 3 217 518 B2 Summary of the invention; Problems to be solved by the invention

[0006] The peristaltic pumps described in patent documents 1 and 2 have a problem in that the structure of the hose itself and the structure of the guide plate that moves the press roller are complex. Further improvement is desirable with regard to the sealing performance (closure performance) of the hose by the press element or press roller.

[0007] In light of the aforementioned problems, the present invention is proposed. An object of the present invention is to provide a peristaltic pump which stably performs fluid flow control and / or regulation, as well as a fluid flow method which implements such a peristaltic pump with a simplified design. Means of solving the problems

[0008] The above problem is solved by the peristaltic pump and the peristaltic conveying method used by the peristaltic pump, according to the independent claims. Additional embodiments are defined in the dependent claims.

[0009] A peristaltic pump in one aspect of the present invention has a plurality of press sections, wherein the press sections are spaced apart from one another in a direction of rotation and are provided for a rotating body which is rotated by a drive unit;and a hose conveying a fluid, wherein the hose is provided on an outer circumferential side of the rotating body, the hose pump comprising a control and / or regulating unit which rotates the rotating body in a conveying direction, after rotating the rotating body counter-clockwise until the rotating body reaches a predetermined angle to restore a section of the hose by increasing the pressure within the hose, together with a counter-clockwise movement of the press section adjacent to a downstream side in the conveying direction, wherein the section of the hose is flattened by the press section on a side furthest upstream in the conveying direction.

[0010] In a fluid conveying method which uses a peristaltic pump according to one aspect of the present invention, the peristaltic pump includes a plurality of press sections, wherein the press sections are spaced apart from one another in a direction of rotation and are provided for a rotating body which is rotated by a drive unit;and a hose conveying a fluid, wherein the hose is provided on an outer circumferential side of the rotating body, wherein the rotating body is rotated in a conveying direction after being rotated against the conveying direction until the rotating body reaches a predetermined angle to restore a region of the hose by increasing the pressure within the hose, together with a movement against the conveying direction of the press section adjacent to a downstream side in the conveying direction, wherein the region of the hose on which the press section presses is on a side furthest upstream in the conveying direction. Effects of the invention

[0011] As described above, the peristaltic pump and the fluid delivery method used by such a peristaltic pump, according to one aspect of the present invention, simplify the construction of the peristaltic pump and perform stable fluid delivery control and / or regulation. Brief description of the drawings Fig. Figure 1A is a partially omitted top view showing an example of the peristaltic pump of an embodiment of the present invention. Fig. Figure 1B is a system configuration diagram that schematically shows an example of a fluid conveying system in which the peristaltic pump is installed. Fig. Figures 2A to 2D are partially interrupted top views which schematically show an example of the fluid conveying method of an embodiment of the present invention, which is carried out with the peristaltic pump. Fig. Figures 3A to 3E are partially interrupted top views that schematically illustrate the fluid conveying process. Fig. Figure 4 is a schematic flowchart showing examples of the fluid conveying process. Description of the embodiments

[0012] One embodiment of the present invention is explained below based on the drawings. Fig. Figures 1 to 4 schematically show an example of the peristaltic pump of the embodiment and an example of a fluid conveying method of the embodiment, which is carried out with the above-mentioned example of the peristaltic pump.

[0013] As in Fig. As shown in Figures 1 to 3, a peristaltic pump 1 is designed in such a way that a plurality of press sections 18, 18 are spaced apart from each other in a direction of rotation and are provided for a rotating body 15 which is rotated by a drive unit 19, and a hose 20 which conveys fluid is provided on an outer circumferential side of the rotating body 15.The peristaltic pump 1 has a control unit 26 which rotates the rotating body 15 in a direction opposite to the conveying direction, i.e., in the opposite direction of rotation, until the rotating body 15 reaches a predetermined angle to inflate a section 21 of the hose 20 by increasing the pressure within the hose 20, together with a movement against the conveying direction of a compression section 18 (18B) adjacent to a downstream side in the conveying direction, in which section 21 of the hose 20 is pressed by a compression section 18 (18A) on the side furthest upstream in the conveying direction. The peristaltic pump 1 is designed to convey or transport a fluid in the hose 20 by rotating the rotating body 15 in the conveying direction, i.e., in normal rotation, and by pressing the compression sections 18 and 18A. Fig. 1A, Fig. 2 and Fig. 3 are moved, wherein a clockwise rotation is set as a rotation of the rotating body 15 in the opposite direction, and a counterclockwise rotation is set as a normal rotation of the rotating body 15.

[0014] The peristaltic pump 1 has a housing-shaped pump body 10 that contains the rotating element 15 and the hose 20. In this embodiment, the pump body 10 is designed to accommodate a single rotating element 15 and a single hose 20. The pump body 10 has a housing recess 11 that opens in one direction, i.e., in the axial direction of the rotating element 15 or in the direction of the rotating shaft 16. A cover body, not shown in the figures, is provided for the pump body 10 to cover the housing recess 11. The housing recess 11 has a recessed curved surface section 12 along which the hose 20 is arranged in a curved state. The recessed curved surface section 12 is designed in the form of a circular arc and is coaxial, i.e., concentric to the rotating shaft 16 when viewed from the axial direction.The figures show an example in which the recessed curved surface section 12 is formed in an essentially semicircular arc shape when viewed from the axial direction.

[0015] The pump body 10 has inlet sections 13 and 14, into which an upstream region 23 on a delivery source side of the hose 20 and a downstream region 24 on a delivery destination side are each inserted. The inlet sections 13 and 14 are arranged such that they extend through a side section on a side opposite a central region of the recessed curved surface section 12, such that, viewed from the axial direction, the hose 20 assumes a substantially U-shaped form in the housing recess 11. Both inner side surfaces of the housing recess 11, which extend into the two end faces of the recessed curved surface section 12, are shaped to be connected to the inlet sections 13 and 14.The figures show an example in which the inlet sections 13, 14 are defined as holding sections which hold base end sections of connection sections (connections, coupling connectors) 23, 24, as an upstream area and a downstream area of ​​the hose 20.

[0016] The rotating body 15 is designed such that a plurality of press sections 18, 18 are provided on an outer circumferential side of the rotating shaft 16 at equal distances from the rotating shaft 16. In other words, viewed from the axial direction, the press sections 18, 18 for the rotating body 15 are provided such that they are located on an equal circumference whose center point is identical to the rotating shaft 16. The press sections 18, 18 are provided such that they are spaced at equal intervals in one direction of rotation of the rotating body 15 around the rotating shaft 16. In this embodiment, the two press sections 18, 18 are provided around the rotating shaft 16 of the rotating body 15. In other words, the two press sections 18, 18 for the rotating body 15 are provided such that the respective intervals in the direction of rotation are angles of 180 degrees.In the figures, the press sections 18, 18 are arranged at distal end sections of areas that are formed in arm shapes (spoke shapes) so that they extend from the rotating shaft 16 in a radial direction.

[0017] In this embodiment, the press sections 18, 18 are press rollers that rotate around roller shafts 17, 17 which are parallel to the rotating shaft 16 of the rotating body 15. As in Fig. As shown in Figure 1A, when the rotating body 15 is in a stop position, that is, an initial position, the pressing sections 18, 18 are arranged opposite an upstream end and a downstream end, which are the two ends of the recessed curved surface section 12 of the pump body 10, thereby pressing the hose 20 together with the recessed curved surface section 12. That is, in this embodiment, the rotating body 15 is in the initial position and presses two positioned pressed areas 21, 22 of the hose 20 through the pressing sections 18, 18. In the initial position, as shown in Fig. As shown in Figure 1A, the example demonstrates that a first press section 18A, located beneath a plurality of press sections 18, 18, on the most upstream side in the conveying direction, and the upstream end of the recessed curved surface section 12 press the pressed area 21 on the upstream side of the hose 20. At the initial position, as shown in Fig. As shown in Figure 1A, the example illustrates that a second pressing section 18B, adjacent to the downstream side of the first pressing section 18A in the conveying direction, and the downstream end of the recessed curved surface section 12 press the pressed area 22 on the downstream side of the hose 20. In this state, where the rotating body 15 is stopped at its initial position, the respective pressed areas 21 and 22 of the hose 20, upon which pressure is applied, are closed, and the conveying of fluid becomes impossible; that is, a conveying stoppage occurs. The initial position of the rotating body 15 mentioned above is an example, and the rotating body 15 can be located in other positions.

[0018] As in Fig. As shown in Figure 1B, the upstream connection section 23 of the hose 20 can be connected to a source-side pipeline 3, which is connected to a storage section 2, which is a fluid source. The downstream connection section 24 of the hose 20 can be connected to a destination-side pipeline 4, which carries fluid to a fluid destination 5. The upstream side beyond the crimped section 21 on the upstream side of the hose 20 can, if necessary, be appropriately equipped with a non-return valve to prevent backflow of fluid towards a source-side 2, a normally open / closed valve, or the like. The hose 20 can be made of an elastomer-based material that is elastic enough to restore the area on which the crimped sections 18 and 19 press, such as natural rubber or a synthetic resin like EPDM, silicone, or neoprene.For hose 20, a suitable material can be used depending on the type of fluid to be pumped. The inner diameter of hose 20, the length along the recessed curved surface section 12, and other dimensions can be appropriately dimensioned according to the flow rate required by the pumped fluid. The fluid pumped by the peristaltic pump 1 can be a liquid of various types, an emulsion-like liquid (i.e., latex-like liquids), slurries, or gases.

[0019] The drive unit 19, which rotates the rotating body 15, is designed to rotate the rotating body 15 normally and in the opposite direction, i.e., forwards and backwards, around the rotating shaft 16. A geared motor or the like, which incorporates a transmission mechanism such as various reduction gears connected to the rotating shaft 16, can be used as the drive unit 19. Since the aforementioned drive unit 19 must stop the rotating body 15 at a suitable rotational position, i.e., a rotational angle, a motor with a brake capable of controlling and / or regulating the rotational position, a servo motor, or the like can be used as the drive unit 19. A detector, such as a rotary angle sensor, that detects the rotational position of the rotating body 15 can be appropriately provided. As described in Fig. As shown in Figure 1B, the drive unit 19 is connected to a control panel 25, which includes the control and / or regulation unit 26. The rotating body 15 is rotated such that the operation of the drive unit 19 is controlled and / or regulated by the control and / or regulation unit 26, thereby achieving fluid delivery (fluid discharge) as described below.

[0020] The control unit 26 consists, for example, of a control circuit such as a CPU. In this embodiment, the control unit 26 performs the control and / or regulation that maintains the rotational position of the rotating body 15, which is rotated against the conveying direction, for a predetermined time, as specified below. In addition to the control unit 26, the control panel 25 is suitably equipped with a storage unit 27, a power supply unit 28, a display operating unit 29, and the like; the storage unit 27 is formed by a memory or the like and stores various operating programs; the power supply unit 28 provides drive power to the drive unit 19; and the display operating unit 29 receives operating inputs and displays them.The control panel 25 can be provided for the peristaltic pump 1 itself or for various devices and systems, that is, for fluid conveying systems in which the peristaltic pump 1 is installed.

[0021] In the peristaltic pump 1, designed as above, as in Fig. Figure 3 shows that when the rotating body 15 is rotated normally from its initial position, self-priming and conveying are carried out, along with the movement of the press sections 18, 18. In other words, as shown in Figure 3, when the rotating body 15 is rotated normally from its initial position, a self-priming and conveying action is performed, along with the movement of the press sections 18, 18. Fig. 3A and Fig. As shown in Figure 3B, when the first press section 18A, located on the upstream side, moves in the conveying direction, the pressed area 21 on the upstream side of the hose 20, against which the press section 18 presses, is restored. Due to a negative pressure function, together with a restoration of the pressed area 21 on the upstream side, fluid flows from the source side 2, that is, the source-side pipeline 3, into the upstream area of ​​the hose 20. When the second press section 18B, located on the downstream side, moves in the conveying direction away from the hose 20, the pressed area 22 on the downstream side of the hose 20, against which the press section 18 presses, is restored. As shown in Fig. Figures 3B to 3D show that when the first press section 18A sequentially presses the hose 20, moves in the direction of the conveying direction and draws in fluid on the upstream side, fluid in the hose 20 on the downstream side is conveyed to the side of the conveying target 5, that is, to the conveying target-side pipeline 4.

[0022] If he turns 180 degrees, that is, half a turn from the starting position as in Fig. When 3A is rotated, the rotating body 15 returns to its initial position, as shown in Fig. Figure 3E shows this. In such a state, where the rotary body 15 is in its initial position after being rotated halfway, the second press section 18B is located on the most upstream side and the first press section 18A on the most downstream side. That is to say, in this embodiment, the rotary body 15 is configured such that each time it is rotated 180 degrees, it is in its initial position; the rotary body 15 is configured such that each time it is rotated 180 degrees, essentially the same quantity, that is, a fixed quantity, of fluid is conveyed. When the rotary body 15 is stopped at a suitable rotational position, for example, at its initial position, the conveying of fluid is stopped, as described above.If such a stop condition persists for a long time and the rotating body 15 is rotated normally to convey fluid, the compressed area 21 on the upstream side of the hose 20, against which the pressing section 18 presses, has difficulty recovering. When the compressed area 21 on the upstream side is compressed and the pressing section 18, which presses against the compressed area 21, moves towards the conveying direction, it becomes difficult to achieve a uniform intake of fluid, i.e., a self-priming function from the delivery source side, leading to a failure of fluid conveying.

[0023] In an example of the fluid conveying method of the embodiment, which is carried out using the peristaltic pump 1 of the embodiment, the following setup is used to prevent the conveying failure described above. In the fluid conveying method of the embodiment, as in Fig. As shown in Figure 2, the rotating body 15 is rotated in the direction of conveying after being rotated against the conveying direction to reach the predetermined angle. Therefore, the compressed area 21 on the upstream side, on which the pressing section 18 presses (18A), is restored on the side furthest upstream in the conveying direction of the hose 20 due to the increasing pressure within the hose 20 in conjunction with the movement against the conveying direction of the pressing section 18 (18B) adjacent to the downstream side in the conveying direction. The example of the fluid conveying process is described below with reference to Fig. 2 to 4 described.

[0024] When the conveying (conveying ON), that is, one step 100 is executed, as in Fig. As shown in Figure 4, the rotating body 15 is rotated in the opposite direction to achieve the predetermined angle, that is, steps 101 to 103, as in Fig. 2A to 2C shown. In other words, by operating the drive unit 19, the rotating body 15 is rotated clockwise, as shown in the figures, against the conveying direction, from the initial position, that is, the stop position, which is shown in Fig. 2A is shown until it reaches the predetermined angle. The aforementioned pumping ON can be detected, for example, by the control and / or regulating unit 26 receiving a pumping ON signal. The pumping ON signal can be output based on an operating input in the display operating unit 29 or the like, can be based on a pumping start signal (a request signal) received from the pumping target side 5, or can be based on other actuation signals executed in various devices or systems in which the peristaltic pump 1 is installed.

[0025] If the rotating body 15 is rotated in the opposite direction, as in Fig. 2B and Fig. As shown in Figure 2C, the first pressing section 18A, located on the most upstream side and pressing on the pressed area 21 on the upstream side of the hose 20, moves against the conveying direction, thus moving away from the hose 20. When the rotating body 15 moves in the opposite direction, the second pressing section 18B, located adjacent to the downstream side and pressing on the pressed area 22 on the downstream side of the hose 20, sequentially presses the hose 20 and moves against the conveying direction.Due to the movement of the second pressing section 18B against the conveying direction, the pressure inside the hose 20 on the upstream side beyond the second pressing section 18B increases, thereby gradually restoring the pressed area 21 on the upstream side of the hose 20, which is pressed by the first pressing section 18A, located in its initial position on the most upstream side. That is, the pressed area 21 on the upstream side is restored by force due to the increase in the internal pressure of the hose 20 in conjunction with the movement of the second pressing section 18B against the conveying direction.Although the compressed area 22 on the downstream side of the hose 20, upon which the second compression section 18B presses, is also considered difficult to restore, the pressure in the hose 20 on the upstream side beyond the compressed area 22 on the downstream side drops and becomes negative due to the movement of the second compression section 18B against the conveying direction. This negative pressure allows restoration in the compressed area 22 on the downstream side.

[0026] The predetermined angle to which the rotating body 15 rotates in the opposite direction from its initial position need not necessarily be the angle at which the pressed area 21 on the upstream side, against which the pressing section 18 presses, is fully restored, and can be an angle for a recovery state in which suction is possible when the rotating body 15 is subsequently rotated normally. The rotating body 15 can be rotated in the opposite direction without reaching its initial position. That is, in this embodiment, the rotating body 15 can be rotated by less than 180 degrees, or can be rotated by an angle at which no backflow of fluid to the delivery source side 2 occurs.Such a predetermined angle can be suitably set according to the inner diameter of the hose 20, a rotation radius of the rotating body 15, the number of press sections 18, a roller diameter, a physical fluid property, or the like. The figures show an example in which the rotating body 15 is rotated from its initial position by 90 degrees in the opposite direction to its rotational position. Whether the rotating body 15 has been rotated against the conveying direction to the predetermined angle or not can be distinguished in the control unit 26. For example, this distinction can be made by the control unit 26 receiving the signal from the detector, such as the rotary angle sensor, which detects the rotational position of the rotating body 15. The predetermined angle can be preset or can be entered by the display operating unit 29 or the like.

[0027] In this embodiment, as in Fig. The 2D diagram shows the rotational position of the rotating body 15, which was rotated in the opposite direction, to be maintained for the predetermined time. That is, as shown in Fig. As shown in Figure 4, when the rotating body 15, which is being rotated in the opposite direction, is at the predetermined angle, that is, in step 102, the rotating body 15 is stopped after the predetermined time has elapsed, that is, in steps 103 and 104. As explained above, holding the rotational position of the rotating body 15, which is being rotated in the opposite direction, for the predetermined time, as shown in Figure 4, allows the rotation of the rotating body 15 to be stopped after the predetermined time has elapsed. Fig. Figure 2D shows the recovery of the compressed area 22 on the downstream side using the aforementioned negative pressure function. The predetermined time during which the counter-rotating rotary body 15 maintains its rotational position need not necessarily be the time required for the compressed area 22 on the downstream side to fully recover and can be suitably adjusted according to the material or diameter of the hose 20, the rotation radius of the rotary body 15, the roller diameter of the pressing section 18, or the like. If the predetermined time is too long, fluid transfer tends to be delayed; the predetermined time can be approximately a few seconds. The predetermined time is not limited to the time from when the rotary body 15 is counter-rotating and stops until the control unit 26 detects that it has reached the predetermined angle.By counting the time elapsed since the initial conveying, the aspect can also be such that the aforementioned predetermined time period is recognized by the control and / or regulation unit 26. The predetermined time can be set in advance or can be entered via the display operating unit 29 or the like.

[0028] When the aforementioned predetermined time has elapsed, the body of revolution 15 is rotated normally, that is, steps 104 and 105. That is, in an essentially similar manner to the one described above. Fig. 2D and Fig.As shown in Figure 3, the rotary body 15 is rotated counterclockwise to the conveying direction by operating the drive unit 19 as shown in the figures. This conveys fluid from the hose 20 to the side of the conveying target 5, i.e., the conveying-target-side pipeline 4. When the conveying is stopped, i.e., conveying OFF, and the rotary body 15 is in its initial position, the rotary body 15 is stopped, i.e., steps 106 and 107. That is, the rotary body 15 is stopped by stopping the drive unit 19.

[0029] The aforementioned pumping OFF state can be detected, for example, by the control and / or regulating unit 26 receiving a pumping OFF signal. This pumping OFF signal can be based on an operating input in the display operating unit 29 or the like, on a pumping stop signal from the pumping destination 5, or on other actuation signals generated in various devices or systems in which the peristaltic pump 1 is installed. The initial position of the rotating body 15 can be detected by the control and / or regulating unit 26, for example, by the control and / or regulating unit 26 receiving the signal from the detector, such as the rotary angle sensor, which detects the rotational position of the rotating body 15, as described above.Instead of such an aspect, the aspect may be such that the rotating body 15 is controlled and / or regulated to stop when it has been rotated by half a degree or a multiple thereof, after it has been rotated until the predetermined quantity of fluid has been conveyed. The aspect is not limited to stopping the rotating body 15 at its initial position; it may be such that the rotating body 15 is stopped at other positions.

[0030] With the above configuration, the peristaltic pump 1 in this embodiment and the fluid delivery method used by the peristaltic pump 1 simplify the design and provide stable fluid delivery control and / or regulation. That is, the aforementioned stop state persists for a long time, thus preventing fluid delivery failure caused by incomplete recovery of the compressed section 21 on the upstream side. In other words, as described above, the rotating body 15 is rotated from its initial position in the opposite direction, i.e., into the stop position, to reach the predetermined angle, thereby restoring the compressed section 21 on the upstream side of the hose 20, which is pressed by the pressing section 18 (the first pressing section 18A), initially located on the most upstream side.In this recovery state, the rotating body 15 rotates normally, thereby performing a uniform fluid intake function from the side of the delivery source 2, together with the movement of the pressing section 18 (the first pressing section 18A), located on the most upstream side, towards the delivery side. This ensures stable fluid delivery and prevents delivery failure. The design is simplified compared to one in which an adhesion-prevention element is inserted into the hose or in which a guide plate with a guide hole is provided to guide the pressing roller. Compared to the above, when the rotating body 15 is stopped, the pressing sections 18 and 18A compress the hose 20, thus improving the sealing performance, preventing fluid from dripping or similar issues upon stopping, and ensuring stable fluid delivery.

[0031] In this embodiment, the rotational position of the rotating body 15, which has been rotated against the conveying direction, is maintained for a predetermined time. Therefore, the compressed area 21 on the upstream side of the hose 20, upon which the pressing section 18 (the first pressing section 18A) presses, is more reliably restored. This section is initially located on the most upstream side, i.e., the stop position. As described above, the restoration of the compressed area 22 on the downstream side is enabled by the negative pressure function. This results in a more uniform fluid flow when the rotating body 15 is rotated normally. Alternatively, the rotating body 15 can be rotated normally immediately after being rotated from its initial position in the opposite direction, i.e., the stop position, to reach the predetermined angle.

[0032] Even though the embodiment described above shows that when pumping is performed (Pumping ON), fluid is pumped such that the rotating body 15 is rotated normally after being rotated in the opposite direction, this aspect is not limited to the embodiment described above. For example, the aspect can be such that the rotating body 15 is rotated in the opposite direction and normally so that the compressed sections 21, 22 of the hose 20 simply restore themselves each time the predetermined time, for example 24 hours, has elapsed, or if the stop state persists beyond the predetermined time. In this aspect, the rotating body 15 can be rotated in the opposite direction and normally without pumping fluid, or it can be repeatedly rotated in the opposite direction and normally multiple times. The peristaltic pump 1 is not limited to the embodiment described above. For example, the rotating body 15 can be provided with three or more compression sections 18.In such a case, the rotating body 15 could be in its initial position at any angle obtained by dividing 360 degrees by the number of press sections 18. A plurality of tubes can be provided such that the outer circumferential side of the rotating body is divided in the direction of rotation and evenly into a plurality of sections. A plurality of rotating bodies can be provided axially and in a parallel manner, and a single or a plurality of tubes can be provided on each of the outer circumferential sides. In addition to the above, the peristaltic pump 1 can be constructed in various ways. Although the embodiment described above shows an example in which the fluid conveying method is carried out using the peristaltic pump 1 of the embodiment, the fluid conveying method of the embodiment can be carried out using other types of peristaltic pumps. Reference sign 1 peristaltic pump 15 Rotating Bodies 18 Press section 19 Drive unit 20 hoses 21 Pressed area on the upstream side (area on which the press section on the most upstream side presses) 26 Control and / or regulating unit

Claims

[1] Peristaltic pump (1), comprising: a plurality of press sections (18), wherein the press sections (18) are spaced apart from one another in a direction of rotation and are provided for a rotating body (15) which is rotated by a drive unit (19); and a hose (20) which conveys a fluid, wherein the hose (20) is provided on an outer circumferential side of the rotating body (15), wherein the peristaltic pump (1) comprises a control and / or regulating unit (26) which rotates the rotating body (15) in a conveying direction, after rotating the rotating body (15) against the conveying direction until the rotating body (15) reaches a predetermined angle in order to restore a region (21) of the hose (20) on which the press section (18) presses on a side furthest upstream in the conveying direction, by increasing the pressure inside the hose (20), together with a movement against the conveying direction of the press section (18) which is adjacent to a side downstream in the conveying direction. [2] Peristaltic pump (1) according to claim 1, wherein the control and / or regulating unit (26) maintains a rotational position of the rotating body (15), which is rotated in the opposite direction to the delivery direction, for a predetermined time. [3] Fluid conveying method which uses a peristaltic pump (1) comprising the peristaltic pump (1): a plurality of press sections (18), wherein the press sections (18) are spaced apart from one another in a direction of rotation and are provided for a rotating body (15) which is rotated by a drive unit (19); and a hose (20) which conveys a fluid, wherein the hose (20) is provided on an outer circumferential side of the rotating body (15), wherein the rotating body (15) is rotated in a conveying direction after being rotated against the conveying direction until the rotating body (15) reaches a predetermined angle to restore a region (21) of the hose (20) on which the press section (18) presses on a most upstream side in the conveying direction, by increasing the pressure inside the hose (20), together with a movement against the conveying direction of the press section (18) which is adjacent to a downstream side in the conveying direction. [4] Fluid conveying method according to claim 3, wherein a rotational position of the rotating body (15), which is rotated in the opposite direction to the conveying direction, is maintained for a predetermined time.

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