JP2008138790A - Pinch valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost by remarkably reducing the number of parts and the number of man-hours for assembly, and secure safety and reliability by reducing the size and enhancing the durability of an entire pinch mechanism part and easily and quickly attaching and detaching an elastic tube. <P>SOLUTION: This pinch valve comprises an electromagnetic solenoid part 2 and a pinch mechanism part 3 displaced by the electromagnetic solenoid part 2, at least closing the elastic tube T allowing a fluid to flow therein at the first position Xf by pressing it down for closing a flow passage R, and opening the flow passage R at the second position Xs by releasing the pressing down of the elastic tube T. The pinch valve has one or more stopper parts 4a, 4a at least allowing the entry and exit of the elastic tube T from the radial direction Fd for the elastic tube T and restraining the position of the elastic tube T set at the loading positions Xa, 4a of the pinch mechanism 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pinch valve including a clamper mechanism that opens and closes an elastic tube through which a fluid flows.

  Conventionally, it is a pinch valve for opening and closing a liquid supply tube through which a liquid such as blood or a chemical solution circulates, and an elastic tube is used as the liquid supply tube, and the elastic tube is crushed from the outside. A pinch valve provided with a clamper mechanism that closes a path and releases crushing to open a flow path is known from, for example, Japanese Patent Laid-Open No. 6-117552.

The pinch valve disclosed in the publication includes a coil disposed in a frame, a fixed iron core fixed in the coil, a movable iron core movably inserted in the coil, and a movable iron core fixed. A spring that presses in a direction away from the iron core, a pinch member fixed to an end of the movable iron core opposite to the side facing the fixed iron core, a pinch guide member disposed opposite to the pinch member, and a pinch A tube inserted between the member and the pinch guide member and constituting a fluid flow path, and the pinch guide is pinched by the cooperation of the pinch member and the pinch guide member through the elastic force of the spring, and the pinch guide By supporting the member so as to be rotatable by a frame, the pinch guide member is rotated and displaced between a pinching position of the tube and an open position where the pinching pressure is released.
JP-A-6-117552

  However, the conventional pinch valve described above has the following problems.

  First, the structure that supports the pinch guide member rotatably by the frame complicates the entire structure of the pinch mechanism, and increases the number of parts and the number of parts and manufacturing costs associated with an increase in assembly man-hours. In addition, the size of the entire pinch mechanism is increased, and the durability is lowered.

  Second, since the pinch guide member is configured to rotate and displace between the pinching position of the tube and the open position where the pinching pressure is released, the operation of attaching and detaching the tube to the pinch valve becomes troublesome. If a pinch valve or other malfunction or malfunction occurs and the tube needs to be removed or replaced quickly, the tube cannot be quickly attached or detached.

  The object of the present invention is to provide a pinch valve that solves such problems in the background art.

  In order to solve the above-described problem, the pinch valve 1 according to the present invention includes an electromagnetic solenoid unit 2 and an elastic tube T that is displaced by the electromagnetic solenoid unit 2 and that circulates fluid at least at the first position Xf. A pinch valve including a pinch mechanism unit 3 that crushes and closes the flow path R and releases the elastic tube T and opens the flow path R at the second position Xs. On the other hand, at least one or two or more of the elastic tubes T that allow entry or withdrawal from the radial direction Fd and restrict the position of the elastic tubes T set at the loading position Xa of the pinch mechanism unit 3. The stopper portions 4a are provided.

  In this case, according to a preferred aspect of the invention, the pinch mechanism unit 3 includes a movable pinch unit 12 that is interlocked with the displacement of the armature 11 in the electromagnetic solenoid unit 2 and a fixed pin that is fixedly provided at a position facing the movable pinch unit 12. It can be configured by providing pinch portions 13a. Further, a pair of fixed pinch portions 13a... (13a, 13b) can be provided at positions opposed to the movable pinch portion 12 by 180 °. Further, the stopper portions 4a can be integrally formed with the fixed pinch portions 13a, and at this time, the stopper portions 4a are protruded from the predetermined positions of the fixed pinch portions 13a to protrude into the stopper portions 4a. And the gap Sa between the movable pinch portions 12 can be set narrower than the outer diameter of the elastic tube T.

  According to the pinch valve 1 according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) With respect to the elastic tube T, at least the elastic tube T is allowed to enter or exit from the radial direction Fd, and the position of the elastic tube T set at the loading position Xa of the pinch mechanism unit 3 is set. Since the restricting stopper portion 4a is provided, the entire structure of the pinch mechanism portion 3 can be simplified even when the retaining structure for the elastic tube T is adopted, and the component cost is greatly reduced by the number of components and the number of assembly steps. In addition, the manufacturing cost can be reduced, and the entire pinch mechanism 3 can be reduced in size and size and the durability can be improved.

  (2) The elastic tube T can be easily attached to and detached from the pinch valve 1, and even if a malfunction or malfunction occurs in the pinch valve 1 or the like, and the elastic tube T needs to be quickly attached or detached, it is elastic. The tube T can be quickly attached and detached, and safety and reliability can be ensured.

  (3) According to a preferred embodiment, the pinch mechanism unit 3 is provided with a movable pinch unit 12 that is interlocked with the displacement of the armature 11 in the electromagnetic solenoid unit 2 and a fixed pinch unit that is fixed at a position facing the movable pinch unit 12. If comprised by 13a ..., the structure which concerns on this invention, especially the stopper part 4a ... can be provided easily and reliably.

  (4) If a pair (13a, 13b) of the fixed pinch portions 13a... Is provided at a position opposed to the movable pinch portion 12 by 180 [.degree.] According to a preferred embodiment, flexibility when using the pinch valve 1 is provided. And the usability can be further enhanced.

  (5) If the stopper portions 4a are integrally formed with the fixed pinch portions 13a according to a preferred embodiment, a separate assembly part is not required and can be implemented easily and at low cost.

  (6) According to a preferred embodiment, the stopper portion 4a is protruded in a protruding shape from a predetermined position of the fixed pinch portion 13a, and a gap Sa generated between the stopper portion 4a and the movable pinch portion 12 is formed by the elastic tube T. If the outer diameter is set to be narrower than the outer diameter, the elastic tube T can be more reliably prevented from coming off.

  Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

  First, the configuration of the pinch valve 1 according to the present embodiment will be described with reference to FIGS.

  When the pinch valve 1 shown in FIG. 1 is a front face, the pinch valve 1 is roughly divided into an electromagnetic solenoid portion 2 disposed at a lower portion and a pinch mechanism portion 3 attached to an upper end of the electromagnetic solenoid portion 2.

  The electromagnetic solenoid unit 2 includes a cylindrical casing (main yoke) 21, and as shown in FIG. 7, the upper end opening and the lower end opening of the casing 21 are respectively closed by a disk-shaped upper yoke 22 and a lower yoke 23. In this case, the yokes 22 and 23 are fixed by caulking the upper and lower edges of the casing 21. Inside the casing 21, a coil unit 24 in which a coil 24c is wound around a coil bobbin 24b is accommodated. The coil bobbin 24 b has a cylindrical coil winding portion 24 bc, and the lower end is fixed to the lower yoke 23 by housing the pole 25 inside the coil winding portion 24 bc. A spring housing hole 25s is formed in the center of the upper end surface of the pole 25 in the axial direction, and the coil spring 26 is housed inside the spring housing hole 25s. Further, the armature 11 is accommodated inside the coil winding portion 24bc and above the pole 25. The upper end portion of the armature 11 is exposed to the upper end surface of the upper yoke 22 through an opening 22 s formed in the upper yoke 22. As a result, the armature 11 is biased upward by the coil spring 26. Reference numeral 27 denotes a lead wire connected to the coil 24c.

  The pinch mechanism unit 3 includes a base block 31 and a movable block 41, and the base block 31 and the movable block 41 are integrally formed of plastic or the like.

  In this case, the base block 31 has a base board portion 32, and the base board portion 32 is fixed to the upper end surface of the upper yoke 22 by two mounting screws 51 and 52. The base board portion 32 has a protruding portion formed wider than the outer diameter of the electromagnetic solenoid portion 2, and a mounting hole portion 32h and a notch portion 32c are provided in the protruding portion. The pinch valve 1 can be attached to a predetermined installation location using the hole 32h and the notch 32c. Furthermore, an upward bulging portion 33 along the front-rear direction is provided at the center of the base board portion 32 in the left-right direction. And the upper surface of the bulging part 33 is formed as a pinch surface in the fixed pinch part 13a which has the flat part 34h and the protrusion 34m along the front-back direction in the center of this flat part 34h, as shown in FIG. Therefore, the base board part 32 comprises the fixed pinch part 13a.

  In addition, on the rear surface of the upper surface of the base board portion 32, a standing portion 35 that rises upward and a protruding portion 36 that protrudes forward from the upper end of the standing portion 35 are provided. As shown in FIG. 5, the lower surface of the overhang portion 36 is formed as a pinch surface in a fixed pinch portion 13b having a flat portion 37h and a projecting portion 37m extending in the front-rear direction at the center of the flat portion 37h. Therefore, the overhang part 36 constitutes the fixed pinch part 13b. A vertical slit 35s through which the movable pinch part 12 (described later) is inserted is formed at the center of the standing part 35 in the left-right direction, and the movable pinch part 12 is provided on the rear surface of the overhang part 36 and the bulging part 33. Recessed guide portions 36g and 33g for guiding the guide in the vertical direction are formed.

  On the other hand, as shown in FIG. 8, the movable block 41 includes a base portion 42, a screw portion 43 projecting from the lower surface of the base portion 42, a support portion 44 erected upward from the base portion 42, and an intermediate position of the support portion 44. A movable pinch portion 12 that protrudes forward is provided. As shown in FIG. 5, the upper and lower surfaces of the movable pinch portion 12 are formed as pinch surfaces each having a flat portion 45 h... And a protrusion 45 m along the front-rear direction at the center of the flat portion 45 h.

  The movable block 41 can be assembled to the armature 11 and the base block 31 as follows. As shown in FIG. 7, the movable block 41 can be coupled to the armature 11 by screwing the screw portion 43 into a screw hole formed in the upper end surface of the armature 11. The base portion 42 of the movable block 41 is accommodated in a recess 33 i formed on the lower surface of the base board portion 32 by the bulging portion 33, and displacement is allowed only in the vertical direction. Further, the movable pinch part 12 is inserted forward through the slit part 35s, and the support part 44 is guided in the vertical direction by the guide parts 36g and 33g.

  As a result, the movable pinch portion 12 attached to the tip of the armature 11 in the electromagnetic solenoid portion 2 and a pair of fixed pinch portions 13a and 13b fixedly provided at positions opposed to the movable pinch portion 12 by 180 [°]. A pinch mechanism section 3 having the above is configured. The loading position Xa between the movable pinch portion 12 and the lower fixed pinch portion 13a is the loading position Xa for setting the elastic tube T, and the elastic tube T is set between the movable pinch portion 12 and the upper fixed pinch portion 13b. The elastic tube T can be set at one or both of the loading positions Xa and Xb. Thus, by providing two selectable loading positions Xa and Xb, flexibility and usability when using the pinch valve 1 can be further enhanced. FIG. 1 shows a case where the elastic tube T is set at the loading position Xa between the movable pinch portion 12 and the lower fixed pinch portion 13a.

  The above is the basic configuration of the pinch valve. In addition to the basic configuration of the pinch valve, the pinch valve 1 according to the present embodiment regulates the position of the elastic tube T set at the loading positions Xa and Xb. Two stopper portions 4a and 4b are provided. The stopper parts 4a, 4b allow the elastic tube T to enter or exit at least from the radial direction Fd of the elastic tube T, and are set at the loading position Xa of the pinch mechanism part 3. A function of regulating the position of T is provided, and as shown in FIG.

  In this case, the lower stopper portion 4a protrudes upward from the upper surface of the fixed pinch portion 13a so that the gap Sa generated between the stopper portion 4a and the movable pinch portion 12 is larger than the outer diameter of the elastic tube T. The upper stopper portion 4b is protruded downward from the lower surface of the fixed pinch portion 13b, and a gap Sb generated between the stopper portion 4b and the movable pinch portion 12 is set to the outer diameter of the elastic tube T. Set it a little narrower. Thereby, the stopper parts 4a and 4b oppose each other. With such a configuration, it is possible to more reliably prevent the elastic tube T from coming off.

  As described above, the basic configuration of the pinch mechanism unit 3 includes a movable pinch unit 12 that is interlocked with the displacement of the armature 11 in the electromagnetic solenoid unit 2 and a fixed pinch unit that is fixedly provided at a position facing the movable pinch unit 12. Since the stoppers 4a and 4b can be easily and reliably provided and the stoppers 4a and 4b can be integrally formed with the fixed pinch parts 13a and 13b because of the configuration provided with 13a and 13b, a separate assembly part is required. Is unnecessary, and there is an advantage that it can be implemented easily and at low cost.

  Next, the usage method and operation | movement of the pinch valve 1 which concern on this embodiment are demonstrated with reference to FIGS.

  The pinch valve 1 can be attached to a predetermined installation location by using a fixing screw or the like using an attachment hole 32 h and a notch 32 c formed in the base board portion 32. Then, an elastic tube (liquid feeding tube) T through which a liquid such as blood or a chemical solution is circulated is set at the loading positions Xa and Xb of the pinch mechanism unit 3. FIG. 1 shows the case where the movable pinch part 12 is set at the loading position Xa between the lower fixed pinch part 13a. In this case, the elastic tube T can be set at the loading position Xa from the radial direction Fd of the elastic tube T through the gap Sa. Since it can be set in this way, for example, it is not necessary to perform an installation operation such as removing one end of the elastic tube T already connected to the device and inserting it in the axial direction from this end, and connecting to the device etc. The elastic tube T that has been used can be set as it is from the radial direction Fd. The elastic tube T set at the loading position Xa has the gap Sa set to be narrower than the outer diameter of the elastic tube T, so that the elastic tube T is more reliably prevented from coming off.

  On the other hand, the operation of the pinch valve 1 is as follows. First, when the coil 24c of the electromagnetic solenoid unit 2 is not excited (energized), the armature 11 is biased upward by the coil spring 26, so that the base 42 of the movable block 41 is restricted to the inner upper end of the recess 33i and is movable. The pinch part 12 is located at the second position Xs shown in FIG. 1 (FIG. 7). The movable pinch portion 12 at the second position Xs is at a central position between the fixed pinch portions 13a and 13b, and this position is a position where the elastic tube T is released from being crushed and the flow path R is opened.

  On the other hand, when the coil 24 c of the electromagnetic solenoid unit 2 is excited (energized), the armature 11 is attracted downward by the magnetic field generated by the coil 24 c and stops at the position where the armature 11 contacts the pole 25. As shown in FIG. 2, this position is a first position Xf in which the movable pinch portion 12 is displaced downward from the second position Xs, and is a position where the elastic tube T is crushed and the flow path R is closed.

  Therefore, the pinch valve 1 according to this embodiment permits at least the elastic tube T to enter or leave the elastic tube T from the radial direction Fd, and is the loading position of the pinch mechanism unit 3. Since the stopper portion 4a for restricting the position of the elastic tube T set to Xa is provided, the entire structure of the pinch mechanism portion 3 can be simplified even when a retaining structure for the elastic tube T is employed. The parts cost and the manufacturing cost can be reduced by greatly reducing the number of parts and the number of assembly steps, and the entire pinch mechanism unit 3 can be made compact and compact and the durability can be improved. In addition, the elastic tube T can be easily attached to and detached from the pinch valve 1, and even if the pinch valve 1 or the like malfunctions or malfunctions, and the elastic tube T needs to be quickly attached or detached, the elastic tube T T can be quickly attached and detached, ensuring safety and reliability.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the scope of the present invention is not deviated from the gist of the present invention in the detailed configuration, shape, material, quantity, and the like. It can be changed, added, or deleted arbitrarily.

  For example, the example shows the case where the elastic tube T is set at the loading position Xa between the movable pinch part 12 and the fixed pinch part 13a, but the elastic tube T is set at the loading position Xb between the movable pinch part 12 and the fixed pinch part 13b. May be. In this case, it can be implemented by changing the specification (type) of the electromagnetic solenoid unit 2. Moreover, it can also set to both loading position Xa and Xb, and what is necessary is just to change the specification of the electromagnetic solenoid part 2 to the type displaced to three positions in this case. Therefore, the second position Xs in the present invention includes not only one position but also a plurality of positions. Furthermore, you may use the electromagnetic solenoid part 2 which displaces the armature 11 to arbitrary positions, and in this case, the continuous arbitrary positions become the 2nd position Xs. On the other hand, although the case where the stopper portions 4a and 4b are provided on the right side is shown, they may be provided on the left side, and may be provided at two locations on the right side and the left side if necessary. In addition, the configuration of the pinch mechanism portion 3 does not exclude other configurations that exhibit the same function, and does not exclude the case where the fixed pinch portion 13a is provided at one location. Further, the stopper portion 4a does not exclude the case where a separately formed component is assembled to the fixed pinch portion 13a.

The front view which shows the state which set the elastic tube to the pinch valve which concerns on the best embodiment of this invention, The front view of the pinch mechanism part which shows the state which moved the movable pinch part in the same pinch valve to the 1st position, A perspective view of the pinch valve, Plan view of the pinch valve, Front view of the pinch valve, Right side view of the pinch valve, FIG. 4 is a cross-sectional front view of the pinch valve taken along line AA in FIG. A sectional side view of a movable block used for the pinch valve,

Explanation of symbols

  1: pinch valve, 2: electromagnetic solenoid, 3: pinch mechanism, 4a ...: stopper, 11: armature, 12: movable pinch, 13a ...: fixed pinch, Xf: first position, Xs: first Second position, Xa ...: loading position, T: elastic tube, R: flow path, Fd: radial direction, Sa ...: gap

Claims (5)

  An electromagnetic solenoid part and a displacement by the electromagnetic solenoid part, at least in the first position, crush the elastic tube that circulates the fluid to close the flow path, and push the elastic tube in the second position. In a pinch valve provided with a pinch mechanism part that releases crushing and opens a flow path, the elastic tube is allowed to enter or exit at least from the radial direction of the elastic tube, and the pinch mechanism part A pinch valve comprising one or more stoppers for regulating the position of the elastic tube set at the loading position.   The said pinch mechanism part is provided with the movable pinch part interlock | cooperated with the displacement of the armature in the said electromagnetic solenoid part, and the fixed pinch part fixedly provided in the position facing this movable pinch part. Pinch valve.   3. The pinch valve according to claim 2, wherein a pair of the fixed pinch portions are provided at positions opposed to the movable pinch portion by 180 [deg.].   The pinch valve according to claim 2 or 3, wherein the stopper portion is integrally formed with the fixed pinch portion.   The stopper portion protrudes in a protruding shape from a predetermined position of the fixed pinch portion, and a gap generated between the stopper portion and the movable pinch portion is set to be narrower than an outer diameter of the elastic tube. The pinch valve according to claim 3 or 4, wherein the pinch valve is characterized in that:

Images