JP2012107547A - Tube pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly endurable compact tube pump which continuously ejects fluid.SOLUTION: The tube pump 1 ejects fluid in a tube 7 and sucks fluid into the tube 7 through a repetition of pressing and release of the elastic tube 7. The tube pump 1 includes a first pressing portion 11 and a second pressing portion 13 that are disposed so as to hold the tube 7 there-between and having at least one set of pressing surfaces to make them closer or apart from each other, and a first check valve 19a and a second check valve 19b for preventing the reverse flow of the fluid, in the order of the first check valve 19a, the first pressing portion 11, the second check valve 19b and the second pressing portion 13 from the upstream to downstream of the tube 7. The volume ratio (V1:V2) is 2:1 between the volume V1 of the tube 7 pressed with the first pressing portion 11 and the volume V2 of the tube 7 pressed with the second pressing portion 13.

Description

  The present invention relates to a tube pump, and more particularly to a small tube pump with high durability that continuously discharges fluid.

  Various types of pumps, such as iron pumps, roller pumps, peristaltic pumps, etc., are used for pumps that draw and discharge fluid by applying a force that deforms the tube from the outside, using an elastic tube as the working fluid flow path. Things are known. Although these have different names, the basic structural principle of the pump is common, and the tube is pressed and deformed by the rotating pressing member that moves along the longitudinal direction of the tube, and the continuous deformation by the rotational movement of the rotating pressing member. Acts as a pump. This tube is always fixed in a state where a predetermined tensile force is applied so as not to move together with the rotary pressing member. That is, a plurality of rotary pressing members made of rollers or the like are pressed against the tube to deform it, thereby defining a working chamber sealed in the tube between the adjacent rotary pressing members. The working chamber is moved by rotating and moving along the tube, and the fluid in the tube is transferred, that is, sucked and discharged.

  By the way, since this pump needs to be provided with the rotation pressing member pivotally supported so that it may rotate to the bending part of a tube, there exists a problem that the structure of pump itself becomes large and arrangement space becomes large. Moreover, since the tube of this pump is fixed in a state where a tension is applied and is handled by the rotary pressing member, there is a problem that the tube is easily damaged and the durability of the pump is impaired.

  On the other hand, as another type of pump, Patent Document 1 relating to “a micro liquid feed pump” includes “a peristalsis generating mechanism is pressed against a side surface of an elastic liquid feed tube and liquid is moved from one side of the liquid feed tube to the other. In this case, a permanent magnet having an appropriate length in the longitudinal direction of the liquid feeding tube is arranged on one side of the liquid feeding tube, and the other side is attracted by the magnetic attraction force of the permanent magnet. A mover made of a magnetic material is disposed, a coil for canceling the magnetomotive force of the permanent magnet is wound around the permanent magnet, and an inverted U-shaped yoke is fixed to the back surface of the permanent magnet. There is described "a micro liquid feeding pump characterized in that an electromagnetic pressurizing device having both ends opposed to a mover through a gap" is provided.

  The micro liquid feed pump described in this Patent Document 1 can ensure the durability of the pump because the tube is always placed in a tensioned state and does not need to handle the tube, and can be reduced in size and space-saving. However, the fluid cannot be continuously discharged, and there is a discharge pause period, that is, a discharge pause process as shown in FIG. Thus, when there is a discharge pause period, it cannot be used as an application that needs to discharge fluid continuously at a constant pace, for example, a medical pump.

Japanese Utility Model Publication No. 5-52283

  An object of the present invention is to provide a small tube pump with high durability that continuously discharges fluid.

As means for solving the problems,
The first aspect of the present invention is a tube pump that discharges a fluid in the tube by repeatedly pressing and releasing the elastic tube and sucks the fluid into the tube, and is arranged so as to sandwich the tube. The first and second pressing portions having at least one set of pressing surfaces that are close to or away from each other, and the first check valve and the second check valve that prevent back flow of the fluid are provided upstream of the tube. The volume of the tube comprising the first check valve, the first pressing portion, the second check valve, and the second pressing portion in this order from the downstream to the downstream, and being crushed by the first pressing portion The tube pump is characterized in that a volume ratio (V1: V2) between V1 and the volume V2 of the tube to be crushed by the second pressing portion is 2: 1.

In addition, as means for solving the above problems,
According to a second aspect of the present invention, there is provided a disposition portion having a first disposition surface and a second disposition surface where the tube is disposed, and the first disposition surface sandwiching the tube disposed in the disposition portion. And a first opposing surface and a second opposing surface disposed to face the second arrangement surface, and the first pressing portion includes a set of the pressing surfaces including the first arrangement surface and the first opposing surface. The tube pump according to claim 1, wherein the second pressing portion has a set of the pressing surfaces including a second arrangement surface and a second facing surface,
According to a third aspect of the present invention, the first disposition surface and the second disposition surface are disposed substantially in parallel so as to face each other, and the first opposed surface is disposed between the tubes disposed in the disposition portion. And a reciprocating member having the second opposing surface and reciprocating in parallel toward the direction of the first disposing surface and the second disposing surface. A tube pump,
According to a fourth aspect of the present invention, the first arrangement surface and the second arrangement surface are arranged substantially in parallel so as to face each other in opposite directions, and face the tube arranged in the arrangement portion. The reciprocating member which has a surface and the said 2nd opposing surface, and is reciprocated in parallel toward the direction of the said 1st arrangement | positioning surface and the said 2nd arrangement | positioning surface is provided. This is a tube pump.

Furthermore, as means for solving the above-mentioned problem,
According to a fifth aspect of the present invention, at least one of the first pressing portion and the second pressing portion is a tubular opening / closing wall in which adjacent side plates are rotatably connected at both ends in the extending direction to surround the outer periphery of the tube. The one set of pressing surfaces is a first plate including a plurality of side plates located on one side with respect to an imaginary line perpendicular to the tube crushing direction and passing through the axis of the tube among the side plates. The tube pump according to claim 1, comprising a pressing wall and a second pressing wall composed of a plurality of the side plates positioned on the other side with respect to the imaginary line,
According to a sixth aspect of the present invention, the crushing directions are two directions perpendicularly intersecting, and at least one of the first pressing portion and the second pressing portion has two sets of the pressing surfaces. A tube pump according to claim 5.

Furthermore, as means for solving the problems,
A seventh aspect of the invention is characterized in that at least one of the first check valve and the second check valve is a forced valve that is disposed outside the tube and crushes and closes the tube. It is a tube pump given in any 1 paragraph of 6,
An eighth aspect of the present invention is characterized in that the forced valve is configured in the same manner as the first pressing portion or the second pressing portion described in any one of the first to sixth aspects. A tube pump according to claim 7,
In a ninth aspect of the present invention, at least one of the first check valve and the second check valve is a self-standing valve provided inside the tube. This is a tube pump.

  The tube pump according to the present invention includes a first pressing portion and a second pressing portion that are arranged so as to sandwich the tube and have at least one set of pressing surfaces that are close to or away from each other, and a first check that prevents backflow of fluid. Since the valve and the second check valve are provided in order of the first check valve, the first pressing portion, the second check valve, and the second pressing portion from the upstream to the downstream of the tube, the tube is pressed. In addition, the mechanism for releasing the pressure is a small and simple structure, and the fluid can be discharged and sucked without backflowing the fluid by simply pressing and releasing the tube without handling the tube. Therefore, the tube pump according to the present invention has excellent durability that hardly damages the tube, and the structure of the tube pump itself is small, and the arrangement space can be reduced.

  In the tube pump according to the present invention, the volume ratio (V1: V2) between the volume V1 of the tube crushed by the first pressing portion and the volume V2 of the tube crushed by the second pressing portion is 2: 1. Thus, half of the fluid pushed out by the first pressing part is accommodated in the second pressing part and the other half is discharged, and all of the fluid pushed out by the second pressing part acting after the first pressing part is discharged. Is discharged. Therefore, the tube pump according to the present invention can continuously discharge the fluid of the volume V2 at a constant pace by alternately crushing the first pressing portion and the second pressing portion.

  Therefore, according to the present invention, it is possible to provide a small tube pump with high durability that continuously discharges fluid.

FIG. 1 is a schematic view showing a tube pump as an example of the tube pump according to the present invention. FIG. 2 is a schematic explanatory view for explaining the operation and function of a tube pump which is an example of the tube pump according to the present invention. FIG. 3 is a schematic explanatory view illustrating a tube pump which is another example of the tube pump according to the present invention. FIG. 4 is a schematic explanatory view illustrating a tube pump as another example of the tube pump according to the present invention. FIG. 5 is a schematic cross-sectional view showing a cross section of a first pressing portion in a tube pump that is another example of the tube pump according to the present invention. FIG. 6 is a schematic explanatory view illustrating a tube pump which is still another example of the tube pump according to the present invention.

  The tube pump according to the present invention is a tube pump that discharges fluid in the tube and sucks fluid into the tube by repeatedly pressing and releasing the elastic tube. The tube pump according to the present invention is classified in principle as a positive displacement pump, and is a type of pump that sucks and discharges fluid using a tube as a working fluid flow path, and is common to roller pumps, peristaltic pumps, and the like. However, instead of the rotary pressing member that moves along the tube longitudinal direction and handles the tube, the tube is provided along the tube and includes a pressing portion that crushes the tube in the radial direction. The tube pressing mechanism and the fluid suction and discharge mechanism are different in that the fluid is sucked and discharged. The pressing portion in the tube pump according to the present invention does not handle the tube, but crushes the tube in the radial direction to suck and discharge the fluid, so that the tube is not fixed in a state where a predetermined tensile force is applied. In addition, the arrangement state of the tube is not particularly limited, and the tube can be arranged linearly or bent. As will be described later, the pressing portion of the tube pump according to the present invention has a small and simple structure as compared with the rotary pressing member of the roller pump.

  The pressing part in the tube pump according to the present invention has at least one set of pressing surfaces arranged so as to sandwich the tube. The one set of pressing surfaces crush the tube until close to each other and close the internal flow path of the tube, and apart from each other until the tube is crushed, open the internal flow path of the tube. Accordingly, the set of pressing surfaces is configured and arranged to function in this way.

  As a first example of such a pressing portion, for example, a tube is disposed so as to face each other, and a tube disposed in the placement portion is disposed so as to face the surface to be disposed. And a pressing portion that reciprocates so that the opposing surface is close to or away from the arrangement surface.

  As a second example of the pressing portion, for example, a tube is disposed and the disposing surfaces facing in opposite directions are disposed so as to face the disposing surface across the tube disposed in the disposing portion. And a pressing portion that reciprocates so that the opposing surface is close to or away from the arrangement surface.

  As a third example of the pressing part, for example, there is a pressing part having a pressing surface constituted by a tubular opening and closing wall in which adjacent side plates are rotatably connected at both ends in the extending direction and surround the outer periphery of the tube. Can be mentioned. In this tubular opening / closing wall, one set of pressing surfaces is positioned on one side of a plurality of side plates forming the tubular opening / closing wall with respect to an imaginary line perpendicular to the tube crushing direction and passing through the tube axis. The first pressing wall is divided into a first pressing wall made of a plurality of side plates and a second pressing wall made of a plurality of side plates located on the other side with respect to the imaginary line, and the first pressing wall and the second pressing wall are close to each other. Alternatively, they are separated.

  The tube pump according to the present invention has at least two pressing portions, that is, a first pressing portion and a second pressing portion. Each of the first pressing portion and the second pressing portion can employ any of the pressing portions, and a plurality of pressing portions can be combined.

  In the tube pump according to the present invention, the first pressing portion and the second pressing portion function in a continuous manner to suck and discharge fluid. In this way, the first pressing portion and the second pressing portion function alternately like a so-called “double pump”, so that the pulsation caused by one pressing portion is caused by the other pressing portion, similarly to the so-called “double pump”. Since it is weakened, fluid can be discharged without causing a large pulsation peculiar to a so-called “series pump (also referred to as a single pump)” having one pressing portion.

  In the tube pump according to the present invention, the first pressing portion and the second pressing portion are arranged along the tube. Specifically, the first pressing portion is on the upstream side of the tube, and the second pressing portion is the tube. Are arranged on the downstream side of each. The volume V1 of the first squeezed area of the first pressing part and the volume V2 of the second squeezed area of the second pressing part are appropriately set according to the volume of the fluid to be discharged, and are specific to a series of pumps. In order to continuously discharge a constant volume of fluid without causing a large pulsation, the volume V1 of the first pressed area of the first pressing portion and the volume V2 of the second pressed area of the second pressing portion are The volume ratio (V1: V2) is set to 2: 1. Here, when there are a plurality of first pressing portions, the volume V1 is the total volume of these, and is the volume of the first crushed region that is crushed from the pressed state to the closed state, and the volume V2 Is the total volume when there are a plurality of second pressing portions, and is the volume of the second squeezed region that is crushed from the pressed state to the closed state.

  The first check valve and the second check valve in the tube pump according to the present invention may be valves that prevent the backflow of fluid, and are arranged outside the tube and are so-called “forced valves that crush and close the tube. A known valve mechanism such as a so-called “self-standing valve” provided inside the tube can be used. Since the so-called “forced valve” is a valve mechanism that crushes and closes the tube, the pressing portion can be substituted. In addition, a so-called “self-standing valve” may be a valve that is previously mounted or built in a tube. In this case, a check valve built-in tube may be used.

  Since the tube pump according to the present invention having such a configuration and functioning as described above has a simple and small pressing portion, the structure of the tube pump itself is small and the arrangement space can be reduced. The same volume of fluid can be discharged continuously at a constant pace without backflow, and the tube is not easily damaged and exhibits excellent durability. In particular, when a check valve built-in tube is used as the tube, the structure of the tube pump itself can be further reduced and simplified. Therefore, the tube pump according to the present invention is a small tube pump with high durability that continuously discharges fluid.

  In the tube pump according to the present invention, the elastic tube is formed as a tubular body from a flexible material such as polyethylene, polypropylene, silicone resin, vinyl chloride, synthetic rubber, and the like. This tube becomes a transfer path for transferring a fluid. In the tube pump according to the present invention, as the tube, a general tube, that is, a simple hollow tubular tube can be used. In addition, in order to further reduce and simplify the structure of the tube pump itself, For example, a structure similar to a duckbill check valve built-in bellows of an electromagnetically driven bellows pump can be used.

  An example of the tube pump according to the present invention will be described with reference to the drawings. A tube pump 1 as an example of the tube pump according to the present invention is shown in FIGS. FIG. 1 is a schematic diagram showing the tube pump 1, and FIG. 2 is a schematic explanatory diagram for explaining the operation and function of the tube pump 1. The suction and discharge mechanisms of the fluid in the tube pump 1 are sequentially shown in FIG. -It is shown in FIG. This pump 1 employs the pressing portion of the first example for both the first pressing portion and the second pressing portion. The tube pump 1 is a tube pump that discharges a fluid in the tube 7 by repeatedly pressing and releasing the elastic tube 7 and sucks the fluid into the tube 7, and includes a first pressing portion 11. The 2nd press part 13, the 1st check valve 19a, and the 2nd check valve 19b are provided.

  The tube pump 1 includes a first arrangement surface 14 having a first arrangement surface 15a and a second arrangement surface 15b on which a tube is arranged, and a tube 7 arranged on the arrangement portion 14 with a first arrangement therebetween. A first opposed surface 12a disposed opposite the installation surface 15a, and a second opposed surface 12b disposed opposed to the second disposed surface 15b across the tube 7 disposed in the disposing portion 14; The first pressing portion 11 has a pair of pressing surfaces including a first arrangement surface 15a and a first opposing surface 12a, and the second pressing portion 13 includes a second arrangement surface 15b and a second opposing surface 12b. It has a set of pressing surfaces.

  More specifically, in the tube pump 1, the first disposition surface 15 a and the second disposition surface 15 b are disposed substantially in parallel so as to face each other, and the tube 7 disposed in the disposition portion 14. That is, the first facing surface 12a and the second facing surface 12b are provided inside the bent portion 7a of the tube 7 disposed so as to be bent to the first disposing surface 15a and the second disposing surface 15b. The reciprocating member 10 reciprocates in parallel in the direction of the first disposition surface 15a and the second disposition surface 15b.

  1 and 2, the tube pump 1 includes three first disposing walls 14 a and second disposing walls that are erected on a pump body (not shown) so as to be parallel to each other. 14b and the arrangement | positioning part 14 which has the 3rd arrangement | positioning wall 14c, and the bottom face which is arrange | positioned between the 2nd arrangement | positioning wall 14b and the 3rd arrangement | positioning wall 14c, and functions as the 1st opposing surface 12a and the 2nd opposing surface 12b And a reciprocating member 10 having a top surface, a through shaft 16 provided so as to penetrate each first disposing wall 14a, second disposing wall 14b, and third disposing wall 14c, and connecting to the reciprocating member 10. The urging member 17 disposed between the first disposing wall 14a and the head of the penetrating shaft 16 and the second disposing wall 14b of the third disposing wall 14c are connected to the opposite side of the penetrating shaft 16. A driving member 18 that moves back and forth in the axial direction, and a tube disposed in the disposing portion 14. 7, a first check valve 19 a disposed opposite to an end of the second disposition wall 14 b, for example, an end surface, and a downstream side of the tube 7 disposed on the second disposition wall 14 b and of the reciprocating member 10. An end portion, for example, an end face is disposed, and a second check valve 19b is provided that is linked to the first check valve 19a.

  The first arrangement wall 14a, the second arrangement wall 14b, and the third arrangement wall 14c in the arrangement portion 14 have surfaces that are substantially parallel to each other, and the tube 7 is substantially S-shaped along these surfaces. It is arranged in a shape. Specifically, the tube 7 is arranged in a substantially U shape so as to be bent at about 180 ° on both surfaces of the second arrangement wall 14b, and the second arrangement wall 14b and the third arrangement wall. 14 is disposed in a substantially U shape so as to be bent at about 180 ° along the periphery of the reciprocating member 10 disposed between the reciprocating member 10 and the reciprocating member 10. Yes. At this time, the tube 7 is disposed in a substantially S shape so as not to fluctuate greatly between the second disposition wall 14 b and the reciprocating member 10, and is thus fixed in a state where tension is applied in the axial direction of the tube 7. Not. The first placement surface 15a of the second placement wall 14b has a larger area than the first facing surface 12a, and the second placement surface 15b of the third placement wall 14c is the second facing surface 12b. Has a larger area. The distance between the second arrangement wall 14b and the third arrangement wall 14c depends on the outer diameter of the tube 7, the discharge amount of the fluid discharged at one time, that is, the dimensions of the first pressing portion 11 and the second pressing portion 13, the movable range, and the like. It is set accordingly.

  The reciprocating member 10 includes a base body 10 a that forms the first pressing portion 11, and a distal end portion 10 b that is connected to the base body 10 a and forms the second pressing portion 13. Each of the base body 10a and the tip portion 10b may be a rod-shaped body, a columnar body, a plate body, or the like extending in one direction, and in this example, all are formed in a columnar body. The plane of the base 10a where the tip 10b is not formed becomes the first facing surface 12a, and the plane of the tip 10b not connected to the base 10a becomes the second facing surface 12b, and the first facing 12a. And the second facing surface 12b are substantially parallel to each other. That is, the reciprocating member 10 includes a base body 10a having a plane functioning as the first facing surface 12a and a tip portion 10b having a plane functioning as the second facing surface 12b, and end surfaces of the base body 10a and the tip portion 10b. Are formed to be substantially flush with each other. The first facing surface 12 a and the second facing surface 12 b of the reciprocating member 10 are formed by the entire volume V 1 of the first squashed region 8 sandwiched by the first pressing portion 11 and the second covered portion sandwiched by the second pressing portion 13. The dimensions are set so that the volume ratio (V1: V2) to the total volume V2 of the crushed area 9 is 2: 1.

  Two penetrating shafts 16 are provided along the axial direction of the tube 7 disposed on the first disposition surface 15 a so as not to interfere with the tube 7 disposed on the disposing portion 14. Each of the penetrating shafts 16 is connected to the driving member 18 and linearly moves to reciprocate the reciprocating member 10 synchronously.

  The biasing member 17 and the driving member 18 cause the through shaft 16 to move linearly. The urging member 17 is composed of a coil spring, and the drive member 18 is composed of an electromagnet.

  The tube 7 is as described above, and is a normal tube that does not incorporate a check valve.

  The first check valve 19a is a valve body that is disposed at the end of the second disposition wall 14b and closes the bent portion of the tube 5 disposed so as to surround both surfaces of the second disposition wall 14b. is there. The second check valve 19b is disposed at the end of the reciprocating member 10, that is, between the first pressing portion 11 and the second pressing portion 13, and is disposed so as to surround the end of the reciprocating member 10. 5 is a valve body that closes the bent portion of the valve 5.

  Each of the first check valve 19a and the second check valve 19b only needs to be able to crush and close the bent portion of the tube 7, and is formed in a conical shape, for example. The first check valve 19a and the second check valve 19b are connected to a drive member such as an electromagnet, and interlock with each other so that when one of the tubes closes the tube 7, the other opens the tube. So that they are connected.

  In the tube pump 1 having such a configuration, the first pressing portion 11 causes the tube 7 disposed on the first disposition surface 15a to be substantially perpendicular to the first disposition surface 15a together with the first disposition surface 15a. 1st opposing surface 12a arrange | positioned so that it may pinch | interpose along a direction, it is pinched | interposed by the 1st arrangement | positioning surface 15a and the 1st opposing surface 12a, and the 1st opposing surface 12a adjoins the 1st arrangement | positioning surface 15a. A first crushed region 8 to be crushed is formed in the tube 7. Further, as shown in FIG. 1 and FIG. 2, the second pressing portion 13 is configured so that the tube 7 disposed on the second disposition surface 15b is substantially disposed on the second disposition surface 15b together with the second disposition surface 15b. The second opposed surface 12b is disposed so as to be sandwiched along the vertical direction, and is sandwiched between the second disposed surface 15b and the second opposed surface 12b, and the second opposed surface 12b is in contact with the second disposed surface 15b. A second squashed region 9 that is crushed close to the tube 7 is formed in the tube 7.

  The fluid suction and discharge mechanism in the tube pump 1 having the above configuration will be described in more detail with reference to FIG. The tube pump 1 sucks and discharges fluid by functioning so that the first pressing portion 11 and the second pressing portion 13 alternately press and release the pressure. In this tube pump 1, as shown in FIG. 1, the tube 7 is disposed in the disposition portion 14 so as to be substantially S-shaped. At this time, the tube 7 may be empty without being filled with the fluid to be fed.

  The fluid suction and discharge mechanism in the tube pump 1 will be described in order from the fluid discharge step by the first pressing portion 11 after the fluid discharge step by the second pressing portion 11 is completed.

  FIG. 2 is a schematic diagram for explaining a fluid suction and discharge mechanism in a tube pump as an example of the tube pump according to the present invention. FIG. 2A shows the second pressing portion 11 in a state where the first pressing portion 11 is in a flow state. Is a diagram showing an arrangement in which the first check valve 19a is in the closed state and the second check valve 19b is in the open state, and FIG. 2 is a view showing an arrangement in which the pressing portion 13 is in a circulation state, the first check valve 19a is closed, and the second check valve 19b is in an open state. FIG. FIG. 2D is a view showing an arrangement in which the second pressing portion 13 is in a flow state in the closed state, the first check valve 19a is in an open state, and the second check valve 19b is in a closed state, and FIG. When the pressing portion 11 is in the flow state, the second pressing portion 13 is in the closed state, and the first check valve 19a is in the open state, the second reverse Valve 19b is a diagram showing the arrangement in a closed state.

  The state in which the second valve operation step in the tube pump 1 is completed is shown in FIG. In this state, the first pressing portion 11 is in a flowing state, the second pressing portion 13 is in a closed state, the first check valve 19a is in a closed state, and the second check valve 19b is in an open state. The discharge process which discharges the fluid by the 1st press part 11 following this state is implemented. Specifically, the reciprocating member 10, that is, the first facing surface 12 a is formed by the first disposing surface 15 a by the penetrating shaft 16, the biasing member 17 (not shown in FIG. 2), and the driving member 18 (not shown in FIG. 2). Move closer to the. Then, as shown in FIG. 2 (b), the first opposed surface 12a and the first arrangement surface 15a close the first squashed area 8, and the second opposed surface 12b is the second arrangement surface. The second crushed region 9 that is separated from the 15b and is blocked by the second opposing surface 12b and the second arrangement surface 15b is opened. At this time, since the first check valve 19a is in the closed state and the second check valve 19b is in the open state, the fluid sucked into the first squashed region 8 is pumped in the downstream direction, Half of the fluid pumped from the crushing region 8 is temporarily sucked into the opened second crushing region 9, and the remaining half of the fluid is not accommodated in the second crushing region 9 and remains as it is. It passes through the crushed area 9 and is discharged. In this way, the process of discharging 0.5 V1 = V2 of fluid sucked into the first squashed area 8 is completed.

  Subsequently, a 1st valve operation process is implemented after a discharge process. Specifically, as shown in FIG. 2C, the first check valve 19a shifts to an open state and the second check valve 19b shifts to a closed state while the reciprocating member 10 is stationary. Then, the first valve operation process ends.

  Next, the suction / discharge process is performed after the first valve operation process. Specifically, as shown in FIG. 2D, the reciprocating member 10 is moved by a through shaft 16, a biasing member 17 (not shown in FIG. 2), and a drive member 18 (not shown in FIG. 2). 2 Move so as to be close to the arrangement surface 15b. Then, the first opposed surface 12a is separated from the first arrangement surface 15a, and the first crushed region 8 closed by the first opposed surface 12a and the first arrangement surface 15a is opened, and the second The second squashed area 9 is closed by the facing surface 12b and the second arrangement surface 15b. At this time, since the first check valve 19a is in the open state and the second check valve 19b is in the closed state, the fluid of the volume V1 is sucked into the first crushed region 8 by the opening of the first crushed region 8. At the same time, the fluid of the volume V2 sucked into the second squashed area 9 is discharged in the downstream direction. In this manner, the suction / discharge process in which the volume V1 of fluid is sucked into the first squashed area 8 and the volume V2 of fluid temporarily sucked into the second squashed area 9 is discharged. To do.

  Next, the second valve operation step is performed after the suction and discharge step. Specifically, as shown in FIG. 2 (a), the first check valve 19a shifts to a closed state and the second check valve 19b shifts to an open state while the reciprocating member 10 is stationary. Then, the second valve operation step ends.

  When the second valve operation process is thus completed, one cycle of the suction / discharge process in the tube pump 1 is completed. When the fluid is continuously discharged, the second cycle of the discharge process, the first valve operation process, the suction discharge process, and the second valve operation process is 1 as shown in FIGS. 2 (b) to 2 (d). It is carried out in the same manner as in the cycle. That is, when the second cycle is performed, the first pressing portion 11 and the second pressing portion 13 function alternately to suck and discharge fluid.

  Thus, according to the tube pump 1, the discharge process, the first valve operation process, the suction discharge process, and the second valve operation process are continuously performed, and the first pressing part 11 and the second pressing part 13 are alternately arranged. In function, the fluid for the volume of V1 is inhaled while the ejection process is performed twice, and the fluid for the volume of (1/2) V1 is continuously ejected in two parts. As described above, the tube pump 1 is changed to a so-called “series pump” having one pressing portion by the first pressing portion 11 and the second pressing portion 13 functioning alternately like a so-called “double pump”. The fluid can be discharged continuously at a constant pace without causing a characteristic large pulsation. In the tube pump 1, when the first pressing portion 11 and the second pressing portion 13 function alternately, the first check valve 19a and the second check valve 19b appropriately shift between the closed state and the open state. The backflow of fluid can be prevented. In addition, since the tube pump 1 has a small and simple structure as described above, the first pressing portion 11 and the second pressing portion 13 have a small structure and can reduce the arrangement space. The tube 7 is not easily damaged and exhibits excellent durability. Therefore, although the tube pump 1 is small, the tube pump 1 is highly durable and can continuously discharge the fluid without backflowing.

  Another example of the tube pump according to the present invention will be described with reference to FIG. In the tube pump 2 which is another example of the tube pump according to the present invention, the pressing portion of the second example is employed for both the first pressing portion and the second pressing portion. The tube pump 2 is a tube pump that discharges the fluid in the tube 7 by repeatedly pressing and releasing the tube 7 and sucks the fluid into the tube 7, and includes the first pressing portion 21 and the second pressing portion. A portion 23, a first check valve 29a and a second check valve 29b are provided.

  This tube pump 2 is different from the tube pump 1 in that the first pressing portion 21 and the second pressing portion 23 are linearly arranged along the arrangement direction of the tubes 7 arranged linearly. In other words, the tube pump 2 includes the disposing portion 24 having the first disposing surface 25 a and the second disposing surface 25 b where the tube 7 is disposed, and the tube 7 disposed in the disposing portion 24 between A first opposed surface 22a disposed opposite to the first disposed surface 25a; and a second opposed surface 22b disposed opposed to the second disposed surface 25b across the tube 7 disposed in the disposed portion 24. The first pressing portion 21 has a pair of pressing surfaces including a first arrangement surface 25a and a first opposing surface 22a, and the second pressing portion 23 has a second arrangement surface 25b and a second opposing surface 22b. It has a set of pressing surfaces.

  More specifically, in the tube pump 2, the first arrangement surface 25a and the second arrangement surface 25b are arranged substantially in series so as to face in opposite directions, and are arranged in the arrangement portion 24. A reciprocating member 20 having a first facing surface 22a and a second facing surface 22b facing the provided tube 7 and reciprocating in parallel toward the first disposing surface 25a and the second disposing surface 25b is provided. ing.

  This tube pump 2 will be described in more detail with reference to FIG. 3. The tube pump 2 includes two first disposing walls 24a and a second disposing wall which are erected on a pump body (not shown) so as to be spaced apart from each other in one direction. An arrangement portion 24 having an arrangement wall 24b, a reciprocating member 20 having a first opposed surface 22a and a second opposed surface 22b facing the first arrangement wall 24a and the second arrangement wall 25b, and an arrangement portion. 24, the first check valve 29a disposed opposite to the vicinity of the upstream end of the first disposition wall 24a, and the first pressing portion 21 and the second pressing portion 23. And a second check valve 29b arranged to do so.

  The first arrangement wall 24a and the second arrangement wall 24b in the arrangement section 24 are arranged in series so as to be substantially parallel to each other at substantially the same interval as the outer diameter of the tube 7 and not to face each other. The first arrangement surface 25a and the second arrangement surface 25b are provided. The tube 7 is arranged linearly along the first arrangement surface 25a of the first arrangement wall 24a, and is arranged linearly along the second arrangement surface 25b of the second arrangement wall 14b. As a whole, it is arranged linearly on the arrangement part 24. At this time, the tube 7 is not fixed in a state where tension is applied in the axial direction of the tube 7. The first placement surface 25a of the first placement wall 24a has a larger area than the first facing surface 22a, and the second placement surface 25b of the second placement wall 25b is the second facing surface 22b. Has a larger area.

  The reciprocating member 20 extends substantially perpendicularly from the other end portion of the shaft body 20a and the first arm 20b and the other end portion of the shaft body 20a in the opposite direction to the first arm 20b. The second arm 20c has a substantially S-shape. The shaft body 20a is formed in a rod-like body, a column body, a plate body or the like extending in one direction, and integrally connects the first arm 20b and the second arm 20c. The first arm 20b is formed as a cast body or plate having a flat surface in the axial direction of the shaft body 20a, and the surface facing the other end of the shaft body 20a functions as the first facing surface 22a. The second arm 20c is formed as a cast body or plate having a flat surface in the axial direction of the shaft body 20a, and the surface facing one end of the shaft body 20a functions as the second facing surface 22b. The first opposing surface 22 a and the second opposing surface 22 b in the reciprocating member 20 are formed by the entire volume V 1 of the first squashed region 8 sandwiched by the first pressing portion 21 and the second covered portion sandwiched by the second pressing portion 23. The dimensions are set so that the volume ratio (V1: V2) to the total volume V2 of the crushed area 9 is 2: 1. In the reciprocating member 20, the axial length of the shaft body 20a, the thickness of the first arm 20b, the thickness of the second arm 20c, etc. are such that either the first pressing portion 21 or the second pressing portion 23 is in a closed state. It is preferable to adjust so that it may become.

  The tube 7 is a check valve built-in tube having one check valve built therein, and this built-in check valve is disposed between the first pressing portion 21 and the second pressing portion 23, and the second check valve 29 b. It is arrange | positioned in the arrangement | positioning part 24 so that it may function as. The second check valve 29b only needs to have a known structure, and is, for example, at least one tongue piece that extends toward the downstream side in the fluid flow direction on the inner wall of the tube 7. The tongue piece is pushed back to block the flow path.

  The first check valve 29a is a valve body that is disposed so as to face the first arrangement wall 24a and crushes the tube 7 to close it. This check valve 29a is basically the same as the first check valve 19a of the tube pump 1 except that it functions alone.

  In the tube pump 2 having such a configuration, the first pressing portion 21 causes the tube 7 disposed on the first disposition surface 25a to be substantially perpendicular to the first disposition surface 25a together with the first disposition surface 25a. It is comprised by the 1st opposing surface 22a arrange | positioned so that it may pinch | interpose along a direction, it is pinched | interposed by the 1st arrangement | positioning surface 25a and the 1st opposing surface 22a, and the 1st opposing surface 22a adjoins the 1st arrangement | positioning surface 25a. A first crushed region 8 to be crushed is formed in the tube 7. The second pressing portion 23 is disposed so as to sandwich the tube 7 disposed on the second disposition surface 25b along the direction substantially perpendicular to the second disposition surface 25b together with the second disposition surface 25b. The second opposed surface 22b, sandwiched between the second disposed surface 25b and the second opposed surface 22b, and the second opposed surface 22b being crushed close to the second disposed surface 25b 9 is formed in the tube 7.

  The tube pump 2 having the above-described configuration is basically the same as the tube pump 1 except that the arrangement of the first pressing portion 21 and the second pressing portion 23 and the automatic opening / closing by the fluid pressure of the second check valve 29b are different. The fluid suction and discharge mechanism of the tube pump 2 is basically the same as the fluid suction and discharge mechanism of the tube pump 1. That is, the tube pump 2 sucks and discharges fluid by functioning so that the first pressing portion 21 and the second pressing portion 23 alternately press and release the pressure.

  That is, in the discharging step of discharging the fluid by the first pressing portion 21, the reciprocating member 20 moves so as to be close to the first arrangement surface 25 a, and the first pressed area 8 is closed and the second pressed target is pressed. This is implemented by opening the collapsed area 9. Then, like the tube pump 1, the fluid of 0.5V1 = V2 sucked into the first squashed area 8 is discharged without being backflowed.

  Next, the first check valve 29a shifts to the open state, and the first valve operation step is performed.

  Next, in the suction and discharge process, the reciprocating member 20 moves so as to be close to the second arrangement surface 25b, whereby the second squashed area 9 is closed and the first squashed area 8 is opened. Implemented. Then, similarly to the tube pump 1, the volume V1 of fluid is sucked into the first squashed region 8 and the fluid of volume V2 temporarily sucked into the second squashed region 9 is discharged.

  Next, the first check valve 29a shifts to the closed state, and the second valve operation step is performed.

  In this way, one cycle of the suction / discharge process in the tube pump 2 is completed. When the fluid is continuously discharged, the second cycle of the discharge step, the first valve operation step, the suction discharge step, and the second valve operation step is performed in the same manner as the first cycle. That is, when the second cycle is performed, the first pressing portion 21 and the second pressing portion 23 function alternately to suck and discharge fluid.

  Further, the discharge process, the first valve operation process, the suction / discharge process, and the second valve operation process are continuously performed, and the first pressing part 21 and the second pressing part 23 function alternately, and the volume of V1 The fluid is inhaled while the discharge process is performed twice, and the fluid corresponding to the volume of (1/2) V1 is continuously discharged in two steps. Thus, the tube pump 2 is a so-called “series pump” having one pressing portion by the first pressing portion 21 and the second pressing portion 23 functioning alternately like a so-called “double pump”. The fluid can be discharged continuously at a constant pace without causing a characteristic large pulsation. When the 1st press part 21 and the 2nd press part 23 function alternately, since the 1st check valve 29a and the 2nd check valve 29b transfer a closed state and an open state suitably, the backflow of a fluid can be prevented. Further, since the first pressing portion 21 and the second pressing portion 23 have a small and simple structure as described above, the tube 7 is damaged even though the structure of the tube pump 2 itself is small and the arrangement space can be reduced. Demonstrate excellent durability. Furthermore, since the tube 7 can be disposed in a straight line, the tube pump 2 can be mounted in a linear small space even if a space for bending the tube 7 cannot be secured. Therefore, although the tube pump 2 is small, it has high durability and can discharge fluid continuously.

  Another example of the tube pump according to the present invention will be described with reference to FIGS. The tube pump 3 which is an example of the tube pump according to the present invention employs the pressing portion of the third example for both the first pressing portion and the second pressing portion. The tube pump 3 is a tube pump that discharges the fluid in the tube 7 by repeatedly pressing and releasing the elastic tube 7 and sucks the fluid into the tube 7. , A second pressing portion 33, a first check valve 36a and a second check valve 36b.

  The tube pump 3 includes a tube 7, a substrate 38 on which the tube 7 is disposed, and a first pressing portion 31 and a second pressing portion 33 that are disposed so as to sandwich the tube 7 disposed on the surface of the substrate 38. And a first check valve 36a and a second check valve 36b arranged so as to sandwich the tube 7 arranged on the surface of the substrate 38, from the upstream side to the downstream side in the arrangement direction of the tube 7 The first check valve 36a, the first pressing part 31, the second check valve 36b, and the second pressing part 33 are arranged in series at intervals in this order.

  The first pressing portion 31 supports the tubular opening / closing wall 30A, in which adjacent side plates 34a to 34d are rotatably connected at both ends in the extending direction, and supports the tubular opening / closing wall 30A. And a support drive unit 39 that is deformed so as to approach or separate.

  As shown in FIG. 5, the tubular opening / closing wall 30 </ b> A has four side plates 32 a to 32 d connected to each other at both ends by pivots 35 a to 35 d, and has a square cross section perpendicular to the pivots 35 a to 35 d. It is in the body. That is, in the tubular opening / closing wall 30A, the four side plates 32a to 32d are each a pressing wall that presses the tube 7, specifically, the first pressing wall 32a, the second pressing wall 32b, the third pressing wall 32c, and the second pressing wall 32A. The four pressing walls 32d function, and the pivots 35a to 35d can also be referred to as connecting axes. The tubular opening / closing wall 30 </ b> A has the tube 7 inserted therein, and surrounds the outer periphery of the tube 7 serving as the first squashed region 8. Therefore, each of the side plates 32a to 32d is a flat plate-like member, and the axial length thereof is the total volume V1 of the first crushing region 8 sandwiched between the first pressing portions 31 and the second pressing target described later. The volume ratio (V1: V2) with the entire volume V2 of the collapsed region 9 is set to 2: 1.

  The support drive unit 39 includes a support 39a that supports both ends in the axial direction of a pair of pivots 35a and 35c disposed on the side of the tube 7 in the tubular opening / closing wall 30A, and the axis of the tube 7 on the substrate 38. A rail 39b that guides the support 39a and a drive member 39c that moves so that the support 39a approaches or separates from the tube 7 is provided.

  In the four support bodies 39a in the first pressing portion 31, the two support bodies 39a supporting the same pivot axis are interlocked with each other via the pivot axis by the movement of one support body 39a coupled to the drive member 39c. In addition, the two support bodies 39a arranged opposite to each other with the tube 7 interposed therebetween are connected by, for example, a connecting portion (not shown) so that the distance from the outer peripheral surface of the tube 7 is the same. Has been. The rail 39b engages with the bottom of the support 39a and guides the proximity movement or separation movement of the support 39a with respect to the tube 7. Two rails 39b for guiding two supports 39a that support the same pivot axis extend along the axis of the tube 7 behind or in the middle thereof and are connected to each other. The driving member 39c is connected to the support 39a and moves the support 39a. For example, a motor or the like can be adopted as the driving member 39c.

  In the tubular opening / closing wall 30A supported by the support driving unit 39, when a pair of pivots opposed to each other come close to each other, two adjacent side plates connected by the pair of pivots function as a pressing surface. 7 is pressed. At this time, the remaining set of pivots are separated from the tube 7. Specifically, the four side plates 32a to 32d forming the tubular opening / closing wall 30A arranged so as to surround the tube 7 are shown in FIGS. 5 (a) and 5 (b) as a first opening / closing mode. A first pressing wall 31a composed of two side plates 32a and 32b positioned on one side with respect to a virtual horizontal line L1 perpendicular to the crushing direction of the tube 7 and passing through the axis of the tube 7, and a virtual horizontal line It is divided into a second pressing wall 31b composed of two side plates 32c and 32d located on the other side with respect to L1, and a pivot 35b for connecting the first pressing wall 31a and a pivot 35d for connecting the second pressing wall 31b. And the first pressing wall 31a and the second pressing wall 31b are close to or separated from each other, so that the tube 7 can be pressed and released. Has become .

  Further, as shown in FIGS. 5A and 5C, the side plates 32a to 32d have a second opening / closing mode with respect to a virtual vertical line L2 that is perpendicular to the virtual horizontal line L1 and passes through the axis of the tube 7. A third pressing wall 31c composed of two side plates 32a and 32d located on one side and a fourth pressing wall 31d composed of two side plates 32b and 32c located on the other side with respect to the virtual vertical line L2. And the pivot 35a connecting the third pressing wall 31c and the pivot 35c connecting the fourth pressing wall 31d are close to each other or separated to the initial state shown in FIG. 31c and the fourth pressing wall 31d are close to or separated from each other, so that the tube 7 can be pressed and released. Thus, the tubular opening / closing wall 30A is set in two directions in which the crushing direction of the tube 7 intersects each other vertically, that is, the virtual horizontal line L1 and the virtual vertical line L2. The tubular opening / closing wall 30A has two sets of pressing surfaces. One set of pressing surfaces is a first pressing wall 31a and a second pressing wall 31b, and the other set of pressing surfaces is a third pressing wall. 31c and the fourth pressing wall 31d.

  As shown in FIG. 4, the second pressing portion 33 is arranged downstream of the first pressing portion 31 in the arrangement direction of the tube 7, and the basic configuration is the same as that of the first pressing portion 31 except that the axial length is different. Are similarly formed. That is, the second pressing portion 33 includes adjacent side plates 34a to 34d, that is, a first pressing wall 34a, a second pressing wall 34b, a third pressing wall 34c (not shown in FIG. 4), and a fourth pressing wall 34d (FIG. 4). (Not shown) is a tubular opening / closing wall 30B which is rotatably connected by pivots 35e to 35h (not shown in FIG. 4) at both ends in the extending direction, and supports the tubular opening / closing wall 30B. And a support drive unit 39 that is deformed so as to approach or separate from the tube 7. The axial length of each of the side plates 34a to 34d is such that the volume ratio (V1: V2) of the total volume V1 of the first squashed area 8 and the total volume V2 of the second squashed area 9 is 2: 1. So that it is set.

  Also in the tubular opening / closing wall 30 </ b> B of the second pressing portion 33, the outer periphery of the tube 7 serving as the second squashed region 9 is surrounded and the tube 7 is pressed, similarly to the tubular opening / closing wall 30 </ b> A of the first pressing portion 31. Specifically, the four side plates 34a to 34d are two sheets positioned on one side with respect to a virtual horizontal line L1 passing through the axis of the tube 7 perpendicular to the crushing direction of the tube 7 as a first opening / closing mode. Are divided into a first pressing wall 33a composed of side plates 34a and 34b and a second pressing wall 33b composed of two side plates 34c and 34d located on the other side with respect to the virtual horizontal line L1. The first pressing wall 33a and the second pressing wall 33b (FIG. 4) are separated from the pivot 35f (not shown in FIG. 4) that connects the second pressing wall 33b and the pivot 35h (not shown in FIG. 4) that are connected to each other. The tube 7 can be pressed and released by being close to or separated from each other. Further, the side plates 34a to 34d have, as a second opening / closing mode, two side plates 34a and 34d positioned on one side with respect to a virtual vertical line L2 perpendicular to the virtual horizontal line L1 and passing through the axis of the tube 7 (FIG. 4). And a third pressing wall 33c (not shown in FIG. 4), and two side plates 34b and 34c (not shown in FIG. 4) located on the other side of the virtual vertical line L2. And a pivot 35f connecting the third pressing wall 33c and a pivot 35h connecting the fourth pressing wall 33d are close to each other or separated to an initial state. Thus, the third pressing wall 33c and the fourth pressing wall 33d are close to or separated from each other so that the tube 7 can be pressed and released. As described above, the tubular opening / closing wall 30B includes a set of pressing surfaces including the first pressing wall 33a and the second pressing wall 33b, and another set of pressing surfaces including the third pressing wall 33c and the fourth pressing wall 33d. There are two sets of pressing surfaces.

  Each of the first check valve 36a and the second check valve 36b only needs to crush the tube 7 and close the internal flow path. For example, the same configuration as the tube pump 1 or the first pressing portion 31 is used. Or it can also be set as the structure similar to the 2nd press part 33. FIG. In this example, the first check valve 36a and the second check valve 36b are both the first pressing portion 31 and the second check valve except that their axial lengths are different, as shown in FIGS. This is basically the same as the pressing portion 33. That is, in each of the first check valve 36a and the second check valve 36b, adjacent side plates 37a to 37d (37c and 37d are not shown in FIG. 4) are pivotal shafts 37e to 37h at both ends in the extending direction. 37h is not shown in FIG. 4), and the tubular opening / closing walls 30C and 30D are rotatably connected to each other, and the tubular opening / closing walls 30C and 30D are supported and deformed so as to be close to or away from the tube 7. And a drive unit 39. The axial length of each of the side plates 37a to 37d is set to such a length that the internal flow path of the tube 7 can be closed. Also in the tubular opening / closing walls 30C and 30D of the first check valve 36a and the second check valve 36b, respectively, as with the tubular opening / closing wall 30A of the first pressing portion 31, two sets of side plates 37a to 37d are formed. The tube 7 is pressed by the pressing surface. Since the specific opening / closing mode is the same as that of the tubular opening / closing wall 30A of the first pressing portion 31, the description thereof will be omitted.

  A fluid suction and discharge mechanism in the tube pump 3 having the above-described configuration will be described with reference to FIGS. The tube pump 3 sucks and discharges fluid by functioning so that the first pressing portion 31 and the second pressing portion 33 alternately press and release the pressure. In the tube pump 3, as shown in FIG. 4, the tube 7 is linearly disposed on the surface of the substrate 38. At this time, the tube 7 may or may not be filled with fluid.

  The fluid suction and discharge mechanism in the tube pump 3 will be described in order from the fluid discharge step by the first pressing portion 31 after the fluid discharge step by the second pressing portion 33 is completed.

  FIG. 4 is a schematic view showing a tube pump as an example of the tube pump according to the present invention, and FIG. 4A is an initial state of the tube pump, that is, the first pressing portion 31 and the second pressing portion 33 are in a flow state. It is the schematic which shows arrangement | positioning in which the 1st check valve 36a and the 2nd check valve 36a are in an open state, FIG.4 (b) is the 1st press part 31 in a distribution | circulation state, and the 2nd press part 33 is a closed state. FIG. 4C is a diagram showing an arrangement in which the first check valve 36a is closed and the second check valve 36b is opened. FIG. 4C shows the second pressing portion 33 when the first pressing portion 31 is closed. Is a diagram showing an arrangement in which the first check valve 36a is in the closed state and the second check valve 36b is in the open state, and FIG. 4 (d) shows the first press portion 31 in the closed state. 2 The pressing part 33 is in a flow state, the first check valve 36a is open, and the second check valve 36b is closed. FIG. 4 (e) shows a second check valve in which the first pressing portion 31 is in a circulation state, the second pressing portion 33 is in a closed state, and the first check valve 36a is in an open state. FIG. 4F is a diagram showing an arrangement in which the closed state is shown in FIG. 4F. FIG. 4F shows the first pressed portion 31 in the circulating state, the second pressed portion 33 in the closed state, and the first check valve 36a in the closed state. It is a figure which shows the arrangement | positioning which has 2 check valve 36b in an open state.

  FIG. 5 is a schematic cross-sectional view showing a cross section of the first pressing portion 31 in the tube pump 3, and FIG. 5 (a) is a schematic cross-sectional view showing a flow state of the first pressing portion 31, that is, an initial state. FIG. 5B is a schematic cross-sectional view showing a closed state of the first pressing portion 31 in the first opening / closing mode, and FIG. 5C is a schematic cross-sectional view showing a closing state of the first pressing portion 31 in the second opening / closing mode. .

  FIG. 4B shows a state where the fluid discharge process by the second pressing portion 33 in the tube pump 3 is completed. In this state, the first pressing portion 31 is in a circulation state, the second pressing portion 31 is in a closed state, the first check valve 36a is in a closed state, and the second check valve 36b is in an open state. Following this state, a fluid ejection step by the first pressing portion 31 is performed. As shown in FIG. 4C, specifically, the pivots 35a and 35c are moved away from each other by the rail 39b and the drive member 39c in the first pressing portion 31, and are shown in FIG. 5B. The closed state in the first opening / closing mode is closed and the tube 7 is closed, and the pivots 35e and 35g separated from each other by the rail 39b and the drive member 39c in the second pressing portion 33 move so as to approach each other. Then, as shown in FIG. 5 (b), in the first pressing portion 31, the first pressing wall 31 a and the second pressing wall 13 b come close to press the tube 7, so that the first squashed area 8 is formed. In addition to closing, in the second pressing portion 33, the first pressing wall 33a and the second pressing wall 33b (not shown in FIG. 4) are separated to the initial state to open the second squashed region 9. At this time, as shown in FIGS. 4 (b) and 4 (c), the first check valve 36a is closed and the second check valve 19b is open. The fluid sucked into the second pumped area 9 is pumped in the downstream direction, and half of the fluid pumped from the first squashed area 8 is temporarily sucked into the second squashed area 9 and the remaining half of the fluid Is not accommodated in the second squashed area 9 and is discharged as it is through the second squashed area 9. In this way, the process of discharging 0.5 V1 = V2 of fluid sucked into the first squashed area 8 is completed.

  Subsequently, a 1st valve operation process is implemented after a discharge process. Specifically, as shown in FIG. 4 (d), the first check valve 36a moves to the open state while the first pressing portion 31 and the second pressing portion 33 are stationary, and the second check valve 36b transfers to the obstruction | occlusion state and a 1st valve operation process is complete | finished. Here, the first check valve 36a moves so that the pivots 37e and 37g separated from each other by the rail 39b and the drive member 39c are close to the initial state. Then, as shown in FIG. 5A, the first check valve 36a returns to the initial state and enters the open state. On the other hand, the second check valve 36b moves so that the pivots 37e and 37g are separated from each other by the rail 39b and the drive member 39c. If it does so, it will transfer to the obstruction | occlusion state similar to the obstruction | occlusion state in the 1st opening / closing mode shown by FIG.5 (b), and the tube 7 will be obstruct | occluded.

  Next, the suction / discharge process is performed after the first valve operation process. Specifically, as shown in FIG. 4E, the pivots 35a and 35c separated from each other by the rail 39b and the drive member 39c in the first pressing portion 31 move so as to approach the initial state, In the second pressing portion 33, the pivots 35e and 35g are moved away from each other by the rail 39b and the drive member 39c, and the tube 7 is closed by shifting to the closed state in the first opening / closing mode shown in FIG. . Then, as shown in FIG. 5A, in the first pressing portion 31, the first pressing wall 31 a and the second pressing wall 31 b are separated to the initial state, and the second pressed area 9 is circulated. In the second pressing portion 33, as in FIG. 5B, the first pressing wall 33a and the second pressing wall 33b come close to press the tube 7 and close the second squashed area 9. At this time, as shown in FIG. 4 (d) and FIG. 4 (e), the first check valve 36a is in the open state and the second check valve 36b is in the closed state. The fluid of volume V1 is sucked into the first crushed area 8 by opening, and the fluid of volume V2 sucked into the second crushed area 9 is discharged downstream. In this manner, the suction / discharge process in which the volume V1 of fluid is sucked into the first squashed area 8 and the volume V2 of fluid temporarily sucked into the second squashed area 9 is discharged. To do.

  Next, the second valve operation step is performed after the suction and discharge step. Specifically, as shown in FIG. 4 (f), the first check valve 36a shifts to the closed state while the first pressing portion 31 and the second pressing portion 33 remain stationary, and the second check valve 36b transfers to an open state, and a 2nd valve operation process is complete | finished. Here, the first check valve 36a moves so that the pivots 37f and 37h (not shown in FIG. 4) are separated from each other by the rail 39b and the drive member 39c. If it does so, the 1st non-return valve 36a will transfer to the obstruction | occlusion state similar to the obstruction | occlusion state in the 1st opening / closing mode shown by FIG.5 (c), and will obstruct | occlude the tube 7. FIG. On the other hand, the second check valve 36b moves so that the pivots 37e and 37g separated from each other by the rail 39b and the drive member 39c are close to the initial state. Then, the second check valve 36b is returned to the initial state and opened as shown in FIG.

  When the second valve operation process is thus completed, one cycle of the suction / discharge process in the tube pump 3 is completed. When the fluid is continuously discharged, the second cycle of the discharge process, the first valve operation process, the suction discharge process, and the second valve operation process is 1 as shown in FIGS. 4 (c) to 4 (f). It is carried out in the same manner as in the cycle. That is, when the second cycle is performed, the first pressing portion 31 and the second pressing portion 33 function alternately to suck and discharge fluid. And as for the 1st press part 31, the 2nd press part 33, the 1st non-return valve 36a, and the 2nd non-return valve 36b, tubular opening-and-closing walls 30A-30D are alternated in the 1st opening-and-closing mode and the 2nd opening-and-closing mode. In other words, the tubes 7 are alternately pressed in two directions perpendicular to each other.

  As described above, the discharge process, the first valve operation process, the suction discharge process, and the second valve operation process are continuously performed, and the first pressing portion 31 and the second pressing portion 33 function alternately, and the volume of V1 is increased. The fluid corresponding to the volume of (1/2) V1 is continuously discharged in two divided portions. As described above, the tube pump 3 is changed to a so-called “series pump” having one pressing portion by the first pressing portion 31 and the second pressing portion 33 alternately functioning like a so-called “double pump”. The fluid can be discharged continuously at a constant pace without causing a characteristic large pulsation. And when the 1st press part 31 and the 2nd press part 33 function alternately, since the 1st non-return valve 36a and the 2nd non-return valve 36b transfer a closed state and an open state suitably, the backflow of fluid is prevented. it can. Further, since the first pressing portion 31 and the second pressing portion 33 have a small and simple structure as described above, the tube 7 is damaged although the structure of the tube pump 3 itself is small and the arrangement space can be reduced. Demonstrate excellent durability. Furthermore, since the tube 7 can be disposed in a straight line, the tube pump 3 can be mounted in a small linear space even if a space for bending the tube 7 cannot be secured. Therefore, although the tube pump 3 is small, it has high durability and can discharge fluid continuously.

  Further, as shown in FIG. 5, the tubular open / close walls 30A, 30B, 30C and 30D can be alternately opened and closed in two directions perpendicular to each other to crush the tube 7, so that the tube 7 is repeated in one direction. Compared to the case of crushing, the stress applied to the tube 7 is small and high durability is exhibited.

  Still another example of the tube pump according to the present invention will be described with reference to FIG. The tube pump 4, which is still another example of the tube pump according to the present invention, employs the pressing portion of the first example for both the first pressing portion and the second pressing portion, and includes the first check valve and the second check valve. So-called “self-standing valves” are employed for both check valves. The tube pump 4 is a tube pump that discharges the fluid in the tube 7 by repeatedly pressing and releasing the tube 7 and sucks the fluid into the tube 7, and includes a first pressing portion 11 and a second pressing portion. 13, a first check valve 19c and a second check valve 19d are provided. The tube pump 4 has two so-called “self-standing valves” which are so-called “self-standing valves” instead of the first check valve 19 a and the second check valve 19 b which are so-called “forced valves” in the tube pump 1 shown in FIG. 1. A check valve built-in tube incorporating a first check valve 19c and a second check valve 19d is used. Accordingly, since the tube pump 4 is basically the same as the tube pump 1 except for the check valve structure, the structure and description of the fluid suction and discharge mechanisms are omitted. Since the first check valve 19c and the second check valve 19d are appropriately shifted to a closed state and an open state depending on the fluid pressure of the tube 7, unlike the tube pump 1, a valve operation step is not required, and the fluid reverse flow Can be prevented.

  According to this tube pump 4, the discharge process and the suction / discharge process are continuously performed basically in the same manner as the tube pump 1, and the first pressing part 11 and the second pressing part 13 function alternately, The fluid corresponding to the volume of V1 is inhaled while the discharge process is performed twice, and the fluid corresponding to the volume of (1/2) V1 is continuously discharged in two times. As described above, the first pressing portion 11 and the second pressing portion 13 function alternately like a so-called “double pump”, thereby generating a large pulsation peculiar to a so-called “series pump” having one pressing portion. Fluid can be discharged continuously at a constant pace without occurring. And when the 1st press part 11 and the 2nd press part 13 function alternately, since the 1st check valve 19c and the 2nd check valve 19d change to a closed state and an open state suitably with fluid pressure, Backflow can be prevented. Further, since the first pressing part 11 and the second pressing part 13 have a small and simple structure as described above, the tube 7 is damaged even though the structure of the tube pump 4 itself is small and the arrangement space can be reduced. Demonstrate excellent durability. Therefore, the tube pump 4 has a high durability and can discharge a fluid continuously despite being small, and is provided with a first check valve 19c and a second check valve 19d which are so-called “self-standing valves”. The valve operation step of actively operating the check valve is not required, and the first pressing portion 11 and the second pressing portion 13 are continuously functioned to facilitate the operation. Further, since the first check valve 19c and the second check valve 19d are so-called “self-standing valves”, when the first check valve 19c and the second check valve 19d are closed, that is, when they are crushed, It is possible to prevent the fluid from partially flowing back.

  The tube pump according to the present invention is not limited to the above-described embodiments, and various modifications can be made within a range in which the object of the present invention can be achieved. For example, in the tube pumps 1 and 4, the tube 7 is arranged in a substantially S shape, and in the tube pumps 2 and 3, the tube 7 is arranged in a straight line. May be arranged in a substantially U shape so that a part thereof is bent at approximately 180 °, or may be provided so that a part thereof is bent at over 180 ° and below 180 °.

  The tube pumps 1 and 4 have three arrangement walls 14a, 14b, and 14c. In this invention, the tube pump has two arrangement walls that are arranged substantially in parallel via a reciprocating member. If you do.

  The tube pumps 1 and 4 include a reciprocating member 10 in which a base body 10a and a tip end portion 10b are integrally formed, and the tube pump 2 is integrally formed with a shaft body 20a, a first arm 20b, and a second arm 20c. In this invention, the tube pump is provided with at least two reciprocating members in which the base and the tip are separately formed, or the first arm and the second arm are separated. May be provided with at least two reciprocating members formed independently.

  In the tube pump 3, both the first pressing portion 31 and the second pressing portion 33 have two sets of pressing surfaces. In this invention, the pressing portion may have three or more pressing surfaces. Good. The pressing part having three or more pressing surfaces appropriately sets the number of side plates and pivots used according to the number of pressing surfaces.

  Each of the tube pumps 1 to 4 includes one first pressing portion and a second pressing portion, but in this invention, the tube pump may include a plurality of first pressing portions and second pressing portions. .

  The tube pump according to the present invention can be used for various applications, and examples thereof include a medical liquid feed pump, a blood transfer pump, and an analytical chemical liquid transfer pump. Among these uses, in particular, it is necessary to discharge a fluid at a constant pace, for example, a medical liquid feeding pump, more specifically, a biological component measuring device for measuring a biological component such as a blood glucose level, an artificial pancreas device, It is suitably used as a liquid feed pump for an artificial dialysis machine or the like. When the tube pump according to the present invention is used as a medical liquid pump, an infusion member such as a catheter (not shown) having one end connected to, for example, an infusion storage container and the other end provided to the infusion subject. ) Directly or through other connecting members such as joints, other tubes, etc., between the one end and the other end of the tube 7 are mounted and fixed to the substrate, and stored in the infusion storage container. It can be used for transferring infusions.

1, 2, 3, 4 Tube pump 7 Tube 7a Bending portion 8 First squashed region 9 Second squashed region 10, 20 Reciprocating member 10a Base 10b Tip portion 11, 21 First pressing portion (first pressing surface) )
12a, 22a 1st opposing surface 12b, 22b 2nd opposing surface 13, 23 2nd press part (2nd pressing surface)
14, 24 Disposition portions 14a, 24a First disposition walls 14b, 24b Second disposition walls 14c Third disposition walls 15a, 25a First disposition surfaces 15b, 25b Second disposition surfaces 16 Through shaft 17 Energizing force Member (coil spring)
18 Drive member (electromagnet)
19a, 19c, 29a, 36a First check valve 19b, 19d, 29b, 36b Second check valve 20a Shaft body 20b First arm 20c Second arm

30A, 30B, 30C, 30D Tubular opening / closing wall 31 First pressing portion 31a First pressing wall 31b Second pressing wall 31c Third pressing wall 31d Fourth pressing wall 32a First side plate 32b Second side plate 32c Third side plate 32d Fourth Side plate 33 Second pressing portion 33a First pressing wall 33b Second pressing wall 33c Third pressing wall 33d Fourth pressing wall 34a First side plate 34b Second side plate 34c Third side plate 34d Fourth side plates 35a, 35b, 35c, 35d, 35e, 35f, 35g, 35h Axis 37a-37d Side plate 37e-37h Axis 38 Substrate 39 Support drive unit 39a Support 39b Rail 39c Drive member L1 Virtual horizontal line L2 Virtual vertical line

Claims (9)

A tube pump that discharges fluid in the tube by repeatedly pressing and releasing the tube having elasticity, and sucks the fluid into the tube,
A first pressing portion and a second pressing portion that are arranged so as to sandwich the tube and have at least one pair of pressing surfaces that are close to or away from each other, and a first check valve and a second check valve that prevent backflow of the fluid. A valve, in the order from the upstream to the downstream of the tube, the first check valve, the first pressing portion, the second check valve and the second pressing portion in this order,
The volume ratio (V1: V2) of the volume V1 of the tube crushed by the first pressing portion and the volume V2 of the tube crushed by the second pressing portion is 2: 1. pump. An arrangement portion having a first arrangement surface and a second arrangement surface on which the tube is arranged, and the first arrangement surface and the second arrangement on both sides of the tube arranged on the arrangement portion. A first opposing surface and a second opposing surface disposed opposite to the installation surface,
The first pressing portion has a set of pressing surfaces including a first arrangement surface and a first facing surface,
2. The tube pump according to claim 1, wherein the second pressing portion has a set of the pressing surfaces including a second arrangement surface and a second facing surface. The first arrangement surface and the second arrangement surface are arranged substantially in parallel so as to face each other,
Between the tubes disposed in the disposing portion, the first facing surface and the second facing surface are provided, and are parallel to the direction of the first disposing surface and the second disposing surface. The tube pump according to claim 2, further comprising a reciprocating member that reciprocates. The first arrangement surface and the second arrangement surface are arranged substantially in parallel so as to face in opposite directions,
The first opposing surface and the second opposing surface facing the tube disposed in the disposing portion, and reciprocating in parallel toward the direction of the first disposing surface and the second disposing surface. The tube pump according to claim 2, further comprising a reciprocating member. At least one of the first pressing part and the second pressing part is composed of a tubular opening and closing wall in which adjacent side plates are rotatably connected at both ends in the extending direction to surround the outer periphery of the tube,
The one set of pressing surfaces includes a first pressing wall including a plurality of the side plates located on one side with respect to a virtual line passing through the axis of the tube perpendicular to the tube crushing direction of the side plates. 2. The tube pump according to claim 1, wherein the tube pump includes a second pressing wall including a plurality of the side plates located on the other side with respect to the imaginary line.   6. The crushing direction is two directions perpendicularly intersecting, and at least one of the first pressing portion and the second pressing portion has two sets of the pressing surfaces. Tube pump.   At least one of the first check valve and the second check valve is a forced valve that is disposed outside the tube and crushes and closes the tube. The tube pump according to item.   The said forced valve is comprised similarly to the said 1st press part or the said 2nd press part described in any one of Claims 1-6, The tube of Claim 7 characterized by the above-mentioned. pump.   The tube pump according to any one of claims 1 to 6, wherein at least one of the first check valve and the second check valve is a self-standing valve provided inside the tube.

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