JPH10141236A - Liquid supply metering pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube-type liquid supply metering pump able to easily and reliably change a discharge tube and having a strong structure. SOLUTION: Rollers 34 are rotatably held on the one end sides of U-shaped roller shafts 35 whose the other ends are axially rotatably supported in roller shaft supporting holes 37 of roller shaft supporting parts 36 formed on the central part of a rotor 32, the tip of the roller shaft 35 on the side in which the roller 34 is supported is inserted into a groove 38 formed on the rotor 32 and provided with a projecting part 39 perforating the rotor 32. This groove 38 is formed from the position extending from the roller shaft supporting hole 37 in the radial direction of the rotor 32 to the constant rotating direction of the rotor 32 into an arched shape taking the roller supporting hole 31 as the center, and the roller shaft 35 is moved by being guided by the groove 38. A guide part 40 fixed to a pump case 31 is provided between the rotor 32 and the pump case 31, the rotor 32 is guided to the guide part 40 when it is rotated in the constant rotating direction, and the projecting part 40 guides the roller shaft 35 outward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid dispensing pump for use in a box storage bag (hereinafter abbreviated as BiB) type beverage dispenser or the like. (Hereinafter, referred to as a tube pump).

[0002]

2. Description of the Related Art As a beverage dispenser used in a restaurant or a hamburger shop, a tube type pump is combined with BiB, and a concentrated beverage injected from BiB through a flexible discharge tube is supplied to a cold water circuit in the course of the beverage flowing down. The one that is mixed with the supplied diluted cold water and supplied to the cup is, for example, Japanese Patent Publication No. 4-4227.
It is disclosed in, for example, Japanese Patent Publication No. 1 and known.

FIG. 2 shows a configuration example of a beverage circuit of a beverage dispenser. BiB 1 is a bag 1a containing a concentrated beverage made of a flexible plastic sheet housed in a box-shaped case 1b, and a discharge tube 2 made of a flexible resin is connected to the bag 1a. A tube type pump (liquid fixed amount supply pump in the figure) 3 is disposed on the piping path of the discharge tube 2, and the lower end of the tube type pump 3 at the open end of the discharge tube 2 surrounds the open end to mix the beverage. The device 5 is arranged. Further, a chilled water circuit 21 is connected to the beverage mixing device 5. The chilled water circuit 21 has a water reservoir 6 as a water supply source, a water pump 7 for sending water, and a water cooling water. A cooling coil 8 and a cold water valve 9 for controlling the amount of water are connected.

[0004] The tube type pump 3 has a tube guide 3a having an arcuate inner peripheral surface and a plurality of rollers 3b on the periphery.
Are arranged at equal intervals with the rotor 3c, and the discharge tube 2 extends along the inner peripheral surface of the tube guide 3a.
It is arranged so as to be sandwiched between the roller 3b. The rotor 3c is connected to a drive motor (not shown).

[0005] In the beverage dispenser having such a configuration, when the cup 10 is set at the outlet of the beverage mixing device 5 and a beverage supply command is given by a push button operation or a lever operation of pressing the cup 10, the tube pump 3 is turned on.
Starts, the rotor 3c rotates in the direction of the arrow, and the roller 3b presses the discharge tube 2 against the inner peripheral surface of the tube guide 3a,
After being flattened and ironed, the concentrated beverage in the tube 2 is discharged from the distal end of the tube 2 into the beverage mixing device 5. At the same time, the water pump 7 of the chilled water circuit 21 is started and the chilled water valve 9 is opened to supply a fixed amount of diluted chilled water into the beverage mixing device 5. The concentrated beverage and the diluted cold water thus supplied are mixed and adjusted in the beverage mixing device 5, and the beverage is supplied to the cup 10.

In the tube type pump 3 , the discharge tube 2 disposed inside the pump is easily pressed and squeezed by the rollers 3b and is easily damaged, and is replaced with a new tube in a relatively short time. It is necessary to Further, when the discharge tube 2 is attached to the BiB 1 , when the empty BiB 1 is replaced, it is necessary to replace the discharge tube 2 with the tube pump 3 . Therefore, in the tube pump 3 , it is desired that the replacement of the discharge tube 2 can be performed easily in a short time in order to simplify maintenance.

FIG. 3 shows a conventional tube-type pump having a structure different from that of the tube-type pump shown in FIG. 2, in which the operation of replacing the discharge tube is simplified, and (a) is a plan view. (B) is a sectional view, and (c) is a perspective view of a rotor assembly. The discharge tube 2 is provided along the inner peripheral surface of the cylindrical pump case 3d, and the pump case 3d
The rotor 3c having a rotation axis on the same axis as the center axis is provided with a pair of rollers 3b which press the discharge tube 2 and are pressed. The roller 3b is rotatably held on one linear portion of a U-shaped low shaft 3e. The other end of the roller shaft 3e is inserted into a roller shaft support hole 3f formed in a roller shaft support 3k at the center of the rotor 3c, and is rotatably supported by an E-stop ring 3j. This roller shaft
3e, the tip of the side holding the roller 3b is inserted into the hole 3g opened in the rotor 3c during the operation of the pump,
The position is maintained by a spring 3h which urges the roller shaft 3e toward the rotor 3c.

When replacing the discharge tube 2, the roller shaft 3e was pulled out from the hole 3g, and the roller 3b was moved from the pressing position in the use state shown by the solid line to the pressing release position shown by the chain line to replace the discharge tube 2. Later, again, the roller shaft
The tip of 3e is fitted into the hole 3g and reset to the pressed position.
The tube type pump having the structure shown in FIG. 3 is structurally robust because the discharge tube is not replaced by using a pin or a screw.

[0009]

Among the tube type pumps according to the prior art described above, in the case of the pump shown in FIG. 2, every time the discharge tube 2 is replaced, the screw 3m is removed and the tube guide 3a is removed. It is necessary to move the discharge tube 2 outside with the pin 3n as a fulcrum, and it takes time to replace the discharge tube 2. In addition, since the tube guide 3a has a structure in which the pin 3n is movably supported by the pin 3n, the fitting portion of the pin 3n has a backlash, and the pressing force during the pump operation is received by the pin 3n and the screw 3m. There is a problem that the pin 3n is easily damaged.

In the case of the pump shown in FIG.
It is necessary to insert the tip of the roller shaft 3e once pulled out into the hole 3g of the rotor 3c and reset it to the roller pressing position during operation every time the replacement is performed, but the hole 3g is hidden behind the roller 3b and is difficult to see Therefore, the reset operation of the roller shaft 3e is troublesome and time-consuming. Further, there is a concern that an operation error may be caused such that the operation is terminated without the roller shaft 3e being set correctly in the hole 3g. In this case, a trouble that the pump does not operate occurs.

Further, in the case of the conventional tube type pump, the discharge tube 2 is set to the near side, and the rollers 3b
May not be set to a position where it is completely pressed, and in this case, since the part of the discharge tube 2 is not crushed, the liquid leaks, and the function as the fixed amount supply pump is lost. May damage the discharge tube 2 at the end.

The present invention solves the above-mentioned problems of the prior art, and provides a structurally robust tube pump which can easily and reliably replace the discharge tube without causing an operation error. The task is to provide.

[0013]

According to the present invention, a roller is rotatably held by one of the linear portions, and the other linear portion is rotatably supported by a roller shaft supporting portion on the center side of the rotor. A plurality of U-shaped roller shafts, and a roller shaft supporting portion is formed on a fixed direction side of the rotation of the rotor from a position where the roller shaft supporting portion is extended in a radial direction of the rotor, and a tip of one linear portion of the roller shaft is inserted. An arc-shaped groove formed in the rotor, a protruding portion of the roller shaft penetrating through the groove and protruding to a side opposite to the roller arrangement side of the rotor, a surface of the rotor opposite to the roller arrangement side, and A guide portion fixed to the pump case, which is provided in a space between the inner surface of the pump case facing the surface and guides the protrusion of the roller shaft to the outside of the rotor when the rotor rotates in a fixed direction. Have.

The roller holding side of the roller shaft is guided by this groove and can move in an arc shape centering on the roller shaft supporting portion. When replacing the discharge tube, the roller holding side is moved to the center side of the rotor. The roller does not hinder the replacement of the tube, the replacement of the discharge tube can be easily performed, and when the rotor is rotated in a fixed direction, the protrusion of the roller shaft comes into contact with this guide portion and is guided to the outside of the rotor. Then, the roller presses the discharge tube to return to the end of the groove, which is in a squeezed state, so that the normal function of the metering pump is secured.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to examples. FIG. 1 is a structural view showing an embodiment of a liquid metering pump according to the present invention. In FIG. 1, the discharge tube 2 extends along the inner peripheral surface of a cylindrical pump case 31.
The rotor 32 having a rotation axis on the same axis as the center axis of the pump case 31 is provided with a pair of rollers 34 which press the discharge tube 2 and press the discharge tube 2.
It is connected to a driving motor (not shown) through 33,
The roller 34 is rotatably held on one linear portion of a U-shaped roller shaft 35, and the U-shaped roller shaft 35 is
Is inserted into a roller shaft support hole 37 formed in a roller shaft support portion 36 at the center of the rotor 32, and is supported rotatably. From the position where the roller shaft support portion 36 is extended in the radial direction of the rotor 32 to the rotor 32, in the fixed direction side of the rotation of the rotor 32 (in the direction of arrow A in the drawing),
An arc-shaped groove 38 centered on the roller shaft support 36
Is provided. The leading end of the roller shaft 35 on the roller holding side is inserted into the groove 38, and the leading end penetrates the groove and protrudes to the opposite side as a protrusion 39. In the space between the surface of the rotor 32 opposite to the roller 34 side and the inner surface of the pump case 31 facing this surface, when the rotor 32 rotates in a fixed direction, the protrusion of the roller shaft 35 is formed. A guide portion 40 that guides 39 to the outside of the rotor 32 is provided.

In the embodiment shown in FIG.
Is formed integrally with the pump case 31 as a projection, but a separately formed product, for example, a molded product or a wire formed in the same shape as shown in the figure may be attached to the pump case 31. With the above configuration, the roller holding side of the roller shaft 35 is guided by the groove 38, and can be moved in an arc around the support hole 37. Therefore, when replacing the discharge tube 2, the roller holding side must be
The discharge tube 2 can be easily replaced by moving it toward the center of the tube 32 so that the roller 34 does not hinder the replacement of the tube 2.

Further, when the rotor 32 is rotated in a fixed direction after the replacement of the discharge tube 2 is completed, the guide portion 40 guides the projecting portion 39 to the outside of the rotor 32. The roller 34 is pressed to the discharge tube 2 to be in an squeezed state, and the pump 3
Functions normally as a liquid metering pump. Further, unlike the related art, there is no need to insert and remove the roller shaft 35 from the hole 3g, so that the spring 3h for urging the roller shaft 35 toward the rotor 32 is not required.

In the above-described embodiment, the case of a pair of rollers has been described. However, the present invention can be similarly implemented with three or more rollers.

[0019]

According to the present invention, a roller is rotatably held by one of the linear portions, and the other linear portion is rotatably supported by a roller shaft support at the center of the rotor. U-shaped roller shaft, and a roller shaft supporting portion is formed on the rotor in a fixed direction side of the rotation of the rotor from a position where the roller shaft supporting portion is extended in the radial direction of the rotor. Arc-shaped groove, a protruding portion of the roller shaft that penetrates the groove and protrudes to a side opposite to the roller arrangement side of the rotor, and a surface opposite to the roller arrangement side of the rotor and this surface. A guide portion fixed to the pump case, which is provided in a space between the pump case and the inner surface of the pump case and guides the protrusion of the roller shaft to the outside of the rotor when the rotor rotates in a fixed direction. The roller holding side of the roller shaft is Since the roller can be guided and moved along the arc-shaped groove around the shaft support hole, the roller holding side can be moved toward the center of the rotor when replacing the discharge tube, and the roller prevents the replacement of the discharge tube. Therefore, replacement of the discharge tube can be easily performed.

Further, when the rotor is rotated in a fixed direction, the protruding portion is guided by the guide portion and moves outward, reaches the outer end of the groove and is held, so that the roller presses the discharge tube. It is kept in a very tight state, and the normal function as a metering pump is secured.

[Brief description of the drawings]

FIG. 1 shows the structure of an embodiment of a liquid metering pump according to the present invention, wherein (a) is a plan view, (b) is a side sectional view,
(C) is a plan sectional view cut on the lower surface of the rotor.

FIG. 2 is a beverage circuit diagram of a BiB-type beverage dispenser using a conventional liquid dispensing pump.

FIGS. 3A and 3B show a configuration of a liquid fixed-rate supply pump according to another related art different from FIG. 2; FIG. 3A is a plan view, FIG.
(C) is a perspective view of the rotor assembly.

[Description of Signs] 1 BiB 1a Bag 1b Box-shaped case 2 Discharge tube 3 Liquid supply pump 31, 3d Pump case 32, 3c Rotor 33, 3i Rotor drive shaft 34, 3b Roller 35, 3e Roller shaft 36, 3k Roller shaft Support part 37, 3f Roller shaft support hole 38 Groove 39 Projection part 40 Guide part 3a Tube guide 3g hole 3j E-stop ring 3m Screw 3n Pin 3h Spring 5 Drinking mixing device 6 Water tank 7 Water pump 8 Water cooling coil 9 Cold water valve 10 Cup 21 chilled water circuit

Claims (1)

[Claims] 1. A rotor having a pump case having a cylindrical inner peripheral wall, and a plurality of rollers having a center of rotation coaxial with the central axis of the inner peripheral wall of the pump case and arranged at equal intervals along the inner peripheral wall of the case. And a flexible liquid discharge tube provided in contact with the inner peripheral wall surface of the pump case. By rotating the rotor in a fixed direction, the tube is pressed by a roller to squeeze and discharge the liquid in the tube. In the liquid supply pump, a roller is rotatably held on one of the linear portions, and the other linear portion is rotatably supported by a roller shaft supporting portion on the center side of the rotor. A roller shaft and a roller shaft support portion are formed on a fixed direction side of the rotation of the rotor from a position where the roller shaft support portion is extended in a radial direction of the rotor, and are formed into a rotor into which the tip of one linear portion of the roller shaft is inserted. Arc-shaped groove, a protruding portion of the roller shaft that penetrates the groove and protrudes to the side opposite to the roller arrangement side of the rotor, and a surface opposite to the roller arrangement side of the rotor and this surface. A guide portion fixed to a pump case, which is provided in a space between the inner surface of the pump case and a guide portion that guides the protrusion of the roller shaft to the outside of the rotor when the rotor rotates in a fixed direction. Liquid feed pump.