JPH045743Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" (Field of industrial application) The present invention relates to a fluid pumping device, and particularly to a fluid pumping device for discharging two or more liquids while mixing them. .

(Prior art) As a liquid dispensing machine that discharges two or more types of liquid while mixing them using a plunger, the sixth
As shown in the figure, a plurality of (two in the illustrated example) cylinders 31A, 32B and plungers 32A, 32B.
and each plunger 32A, 32B
Cylinders 31A, 31B accompanying the piston drive of
Due to the change in volume within each tank 33A,
The liquids L1 and L2 in 33B are transferred to tubes 36A and 3
6B into the cylinder from suction ports 34A, 34B, and discharged from discharge ports 35A, 35B. Discharge port 35A, 3
The liquids L1 and L2 discharged from the tube 38
A, 38B to the nozzle valve 37, mixed in a mixer 37a provided in the nozzle valve 37 and discharged, but this nozzle valve 37 is connected to the cylinder 31A,
It is provided exclusively to function as an on-off valve so that the liquid pumped from 31B is not discharged unnecessarily.

The above tanks 33A, 33B and suction ports 34A, 3
4B, there are check valves 39A and 39B, and
Check valves 40A, 40B are arranged between the discharge ports 35A, 35B and the nozzle valve 37, respectively, and are operated as the pistons of the plungers 32A, 32B are driven.
9B is open, check valves 40A and 40B are closed, and when discharging, check valves 39A and 39B are closed, check valve 40
A and 40B are opened and both act as a breathing valve.

In addition, in the figure, 41A and 41B are plungers 32.
These are actuators for driving A and 32B.

(Problem to be solved by the invention) However, in the conventional liquid dispensing machine described above, the plunger pump and valves such as check valves are arranged separately, making the entire device large and requiring parts. The disadvantage is that as the number of points increases, the structure becomes complex and costs increase.

In addition, in the case of a conventional liquid discharge machine, a tube 38A is connected between the plunger pump and the nozzle valve 37.
Since the structure is such that the tubes 38A and 38B are connected, a disadvantage arises due to these tubes 38A and 38B. That is,
The liquid discharged from the plunger pump is not discharged in a linear manner due to the conduit resistance and residual pressure of the tubes 38A and 38B, resulting in disadvantages such as uneven application.

The purpose of this invention is to eliminate the above-mentioned drawbacks, and to simplify the configuration by using a plunger to combine the functions of a liquid suction pump, a switching valve for fluid suction and discharge, and an on-off valve for stopping fluid pumping. It is an object of the present invention to provide a fluid pumping device that can be miniaturized, reduce costs, and is optimal as a discharge device that mixes and discharges a plurality of types of fluids.

"Structure of the invention" (Means for solving the problems) The fluid pumping device according to the invention includes a cylinder in which an inlet and an outlet are formed with different circumferential angles, and a piston driven in the cylinder. placed in
A plunger is formed on one side with a notch that communicates the suction port with the suction/discharge chamber side inside the cylinder, and also connects the suction/discharge chamber side with the discharge port by rotating the circumferential angle. In the fluid pressure feeding device, the two cylinders and two plungers are arranged symmetrically, and one rotary drive mechanism is provided for rotationally controlling the plunger so that the notch communicates with the suction port side or the discharge port side. A rotary drive actuator is configured to rotate both plungers synchronously via a link mechanism, and a linear drive mechanism for driving the plunger with a piston is screwed and held so that the plunger can rotate freely with respect to the drive rod. and the driving rods are connected by a connecting bar, and the connecting bar is configured to be synchronously driven by one piston driving actuator via a link mechanism, and two or more types of liquids are mixed and discharged. This is how it was done.

(Function) When the above-mentioned configuration is used in a two-liquid mixing type liquid dispensing machine, the symmetrically arranged plungers have a notch formed on one side of the plunger and a liquid suction port provided in each cylinder. and the suction/discharge chamber side inside the cylinder, and at this time, the discharge port side is blocked by the other surface of the plunger that does not have a notch, so in this state, both plungers are moved back by the linear drive mechanism. Different types of liquids from the two tanks are sucked from the respective suction ports of both cylinders through the notches into the suction and discharge chambers inside both cylinders.

Next, when both plungers are rotated by a predetermined circumferential angle by the rotary drive mechanism at the top dead center of both plungers, the above-mentioned notch is located at a position where the above-mentioned suction/discharge chamber side communicates with the discharge port, and at this time, the suction port side is connected to the plunger. Since the other surfaces of the suction and discharge chambers are closed, when both plungers are moved forward by the linear drive mechanism in this state, the liquid in the suction and discharge chambers is discharged from the respective discharge ports through the notches. The liquid discharged from both discharge ports is mixed by a mixer in a nozzle provided at the bottom of the cylinder, and is discharged from the tip of the nozzle.

When the plungers are rotated by the rotary drive mechanism at the bottom dead center of both plungers and retreated by the linear drive mechanism with the notch corresponding to the suction port side, a suction operation is performed, and the above operation is then repeated.

By controlling the piston drive and rotation of the plunger in this manner, the plunger functions as both a fluid intake and discharge pump and a fluid intake and discharge switching valve. In addition, by rotating the plunger to an angle other than the circumferential angle mentioned above, both the suction port side and the discharge port side are closed off using the other surface that does not have a notch, so it also functions as an on-off valve for stopping fluid pressure feeding. do.

In the above operation, the plunger is rotatably screwed into and held by the drive rod in the linear drive mechanism, so when the rotation of the plunger is controlled by the rotation drive mechanism, the plunger moves up and down by the pitch of the screw. However, since the amount of movement is extremely small compared to the overall amount of movement, not only does it not affect the discharge function in any way, but by appropriately controlling the rotation of the plunger at its bottom dead center, the plunger can be pulled up slightly. This provides a slight suction function and prevents unnecessary dripping of liquid from the nozzle tip.

If the linear drive mechanism and rotational drive mechanism are each configured with one dedicated actuator and link mechanism, multiple plungers can be driven by one dedicated actuator, making the dispensing machine more compact and simple. can be converted into

(Example) An example in which the fluid pumping device according to the present invention is implemented in a two-liquid mixing type liquid discharging machine will be described based on FIGS. 1 to 5.

Figure 1 is a longitudinal sectional view of a two-liquid mixing type liquid discharger, Figure 2 is a side view showing the linear drive mechanism, Figure 3 is a plan view showing the rotational drive mechanism, and Figures 4A and B are inside the cylinder. The cross-sectional views, FIGS. 5A to 5D, are vertical cross-sectional views showing only one cylinder and plunger to explain the operating state.

The two-liquid mixing type liquid discharging machine of the embodiment has two cylinders 1A and 1B symmetrically formed in a cylinder block A, and the two cylinders 1A and 1B have different circumferential angles to form suction ports 2A and 2B and discharge ports. 3A, 3B
On one side of the plungers 5A and 5B, which are driven by pistons in both cylinders, are the suction ports 2A and 2B and the suction and discharge chambers 4A and 4A inside the cylinders.
4B side and by rotating the circumferential angle, the suction/discharge chambers 4A, 4B side and the discharge port 3
A, a notch 6A that communicates with 3B,
6B, and a rotary drive mechanism 7 that rotationally controls both plungers 5A, 5B so that the cutouts 6A, 6B communicate with the suction ports 2A, 2B side or the discharge ports 3A, 3B side, and the both plungers 5A. ,5B
The plungers 5A, 5B are connected to the threaded portions 20A, 20 with respect to the drive rods 9A, 9B in the linear drive mechanism 8.
B, 21A, and 21B are screwed together and held rotatably.

The rotary drive mechanism 7 includes a single rotary drive actuator 10 which synchronously controls the rotation of both plungers 5A and 5B via a link mechanism 11, and the linear drive mechanism 8 includes both drive rods 9A and 5B. 9B are connected by a connecting bar 14, and the connecting bar 14 is synchronously driven by one piston driving actuator 12 via a link mechanism 13. In addition, 15A, 15
B is a tank that stores different types of liquids L1 and L2, and 16A and 16B are tubes that connect the suction ports 2A and 2B to the tanks 15A and 15B.

To explain the above configuration in detail, both inlets 2A, 2
B is cylinder 1 from both sides of cylinder block A.
It is formed to communicate with the inside of A and 1B, and
Both discharge ports 3A, 3B are formed inside the cylinder block A so as to be on the opposite side of the suction ports 2A, 2B. Communication paths 17A and 17B are formed between them.

As mentioned above, the inlets 2A, 2B and the outlet 3
A and 3B are formed on the cylinder wall with different circumferential angles, and in the example, they are formed with a circumferential angle of 180°, but they are not limited to this, and may be formed with a circumferential angle of about 90°, for example. . The outer dimensions of the plungers 5A, 5B correspond to the inner diameters of the cylinders 1A, 1B, and the notches 6A, 6B formed in the plungers 5A, 5B have a substantially half-moon cross section, as shown in FIG. Position A corresponds to suction ports 2A and 2B, but cylinders 1A and 1
By rotating B by 180°, it corresponds to the discharge ports 3A and 3B as shown in FIG. 5C. Also, the length of the notches 6A, 6B is such that the upper end thereof is at the suction port 2 at the bottom dead center of the plungers 5A, 5B.
A and 2B, and the lower edge is located at the discharge ports 3A and 3B at the top dead center.

The link plates 22, 22 and the plungers 5A, 5B of the link mechanism 11 are the plungers 5A, 5B.
are slidably engaged. Further, a mixer 19 is disposed within the nozzle 18, and mixes different types of liquids L1 and L2 discharged from both communication passages 17A and 17B, and discharges the mixture from the nozzle tip 18a.

Next, an example of its operation will be explained based on FIGS. 5A to 5D. In the state shown in FIG. 5A, the plunger 5A
is located at a position where the notch 6A communicates the suction port 2A with the suction/discharge chamber 4A side inside the cylinder, and at this time, the discharge port 3A side is closed by the other surface 5a of the plunger 5A that does not have the notch. In this state, when the plunger 5A is moved backward by the linear drive mechanism 8 as shown in B, the liquid L1 in the tank 15A is sucked through the tube 16A due to the change in the volume of the supply/discharge chamber 4A, and the notch 6A is drawn from the suction port 2A. Through the supply and discharge chamber 4
Inhaled into A.

Next, as shown in C, when the plunger 5A is rotated by a predetermined circumferential angle (180° in the embodiment) by the rotary drive mechanism 7 at the top dead center of the plunger 5A, the above-mentioned notch 6A is connected to the above-mentioned supply/discharge chamber 4A side. It is in a position communicating with the discharge port 3A, and at this time, the suction port 2A side is closed by the other surface 5a of the plunger, so in this state, as shown in D, the plunger 5A
When the liquid L1 is moved forward, the liquid L1 in the supply/discharge chamber 4A is discharged from the discharge port 3A through the notch 6A, and reaches the inside of the nozzle 18 through the communication path 17A.

The rotational drive mechanism 7 rotates the plunger 5A by 180 degrees at the bottom dead center of the plunger 5A shown in D, and the suction operation is performed by retracting the plunger 5A with the notch 6A corresponding to the suction port 2A side. By repeating this, a continuous liquid ejection operation is performed. In addition, the other plunger 5B
Since the plungers 5A and 5A operate synchronously, different types of liquids L1 and L2 can be mixed and discharged.

In the above operation, the plungers 5A, 5B
are the drive rods 9A and 9B in the linear drive mechanism 8.
When the plungers 5A and 5B are rotationally controlled by the rotation drive mechanism 7, both plungers move up and down by the pitch of the screw, but the amount of movement is equal to the total movement. Since the amount is extremely small compared to the amount, it does not affect the ejection function. Rather, in the present invention, both plungers 5
By appropriately controlling the rotation at the bottom dead centers of A and 5B, both plungers 5A and 5B are slightly pulled up to exert a slight suction function, thereby preventing unnecessary dripping of liquid from the nozzle tip 18a. It is something.

By controlling the piston drive and rotation of the plungers 5A and 5B in this way, the plunger 5
A and 5B operate to have both the function of a liquid suction and discharge pump and the function of a switching valve for liquid suction and discharge, and by rotating the plunger to an angle other than the above-mentioned circumferential angle, it can be Inlet port 2A, 2B side and outlet port 3A on surface 5a,
Since the 3B side can be closed together, it also functions as an on-off valve for stopping liquid pumping. Furthermore, it is possible to control the rotation of a plurality of plungers with one rotary drive actuator 10, and to drive the pistons of these plurality of plungers with one piston drive actuator 12.

"Effects of the invention" According to the fluid pumping device according to the invention, the piston drive and rotational drive of the plunger are controlled by respective dedicated drive mechanisms, so that the plunger can switch between the function of a liquid suction and discharge pump and the suction and discharge of liquid. It is possible to have both the function of a valve and the function of an on-off valve for stopping liquid pressure feeding, and the configuration is extremely simple, making it possible to downsize the entire device. Further, since check valves and the like are not required, the number of parts is reduced, and costs can be reduced.

Especially when used in a two-liquid mixing type liquid dispensing machine, the above-mentioned miniaturization and reduction in the number of parts are significant.
In addition, since there is no need for a nozzle valve as a pressure regulating valve or a tube connecting the discharge port and nozzle valve as in the past, the distance from the discharge port to the nozzle is shortened, and the influence of conduit resistance and residual pressure is considerable. Therefore, the mixed liquid can be discharged in a linear state.

Furthermore, in this invention, by appropriately controlling the rotation of the plunger at the bottom dead center of the plunger, unnecessary dripping of liquid from the nozzle tip can be accurately prevented, and it can be used in liquid coating devices, etc. It is optimal.

[Brief explanation of the drawing]

The drawings show an embodiment in which the fluid pumping device according to the present invention is used in a two-liquid mixing type liquid dispensing machine, and FIG.
FIG. 2 is a side view showing the linear drive mechanism, FIG. 3 is a plan view showing the rotational drive mechanism, FIGS. 4A and B are cross-sectional views of the inside of the cylinder, and FIG. 5A to 5D are longitudinal sectional views showing only one cylinder and plunger to explain the operating state. FIG. 6 is a sectional view showing an example of a conventional two-liquid mixing type liquid ejector. A... Cylinder block, 1A, 1B... Cylinder, 2A, 2B... Suction port, 3A, 3B... Discharge port, 4A, 4B... Supply/discharge chamber, 5A, 5B... Plunger, 6A, 6B... Notch, 7...Rotary drive mechanism, 8...Linear drive mechanism, 9A, 9B...Drive rod, 20A, 20B, 21A, 21B...
screw part.

Claims (1)

[Claims for Utility Model Registration] A cylinder in which an inlet and an outlet are formed at different circumferential angles, and a piston is arranged to be driven within the cylinder, and one side has a cylinder with an inlet and an outlet formed at different circumferential angles. A fluid pressure feeding device comprising a plunger formed with a notch that communicates with the suction/discharge chamber side and connects the suction/discharge chamber side with the discharge port by rotating the circumferential angle, wherein the cylinder and the plunger are connected to each other. The two plungers are arranged symmetrically, and a rotary drive mechanism for controlling the rotation of the plungers so that the notch communicates with the suction port side or the discharge port side is a rotary drive actuator that connects both plungers via a link mechanism. The linear drive mechanism for piston-driving the plunger has the plunger rotatably screwed into and held by the drive rod, and the drive rod is connected by a connecting bar. 1. A fluid pumping device for discharging two or more liquids while mixing them, characterized in that a connecting bar is configured to be driven synchronously by a single piston-driving actuator via a link mechanism.