JPS6338551B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reciprocating pump that is mainly used to supply a fixed amount of medium-viscosity liquid (for example, a mixture of flour and water during noodle making). be.

A conventional type of pump of this type has a cylinder body 1' and a plunger 2', as shown in FIGS.
A piston 3' with a through hole 3'', a valve 4' on the piston, and a piston shaft 5' are known, and liquid is sucked in from the suction port 6' during the forward stroke of the piston as shown in Fig. 1. The liquid in the reservoir chamber 7' enters the reservoir chamber 7', and at the same time the liquid in the delivery chamber 8 is carried out from the discharge port 9', and in the backward stroke shown in FIG. The biggest drawback of these conventional pumps is that they provide adequate performance when the liquid to be transported has a relatively low viscosity and is difficult to solidify over time, but when the liquid has a higher viscosity, There are drawbacks such as liquid stagnation around the plunger's moving parts and valves, or insufficient cleaning after work is completed, causing the liquid to solidify and prevent the plunger and valve from working properly. Also,
Since the supply amount cannot be adjusted, for example, if the target liquid is a noodle-making dough, the supply amount will change if the viscosity changes during operation, and there is an inconvenience that the desired constant amount cannot be supplied. .

The present invention has been devised to overcome these drawbacks of the conventional type, and details thereof will be explained with reference to the following embodiments.

In Figures 3 to 6, 1 is a cylindrical body having a suction port 2 and a discharge port 3 for the liquid to be transported at intervals along its length, and the rear end is an open port without a lid as shown in the figure. A cap 15 is attached to the front end as described later. Reference numeral 4 denotes a first piston that reciprocates within the main body, and a shaft 5 of this piston is connected to a drive shaft (not shown) via a connecting portion 6 and an adjustment ring 11 to be described later. As shown in the figure, a second piston 7 is inscribed in the piston shaft 5, circumscribed on the inner surface of the main body 1, and guided by these to be able to reciprocate freely. (between the front end surface 1'' and the step 1 on the inner surface of the main body)
is caused to reciprocate as the first piston 4 reciprocates. A spring 8 is interposed between the second piston 7 and the inner surface of a cap 15, which will be described later, as shown in the figure, in order to cause the second piston to move back. The elasticity of this spring is set to be sufficient for the return movement of the second piston and to be kept to the minimum necessary level so as to achieve the above-mentioned purpose and to ensure that the pump operation as described later is not hindered.
9 are liquid-tight rings, respectively.

The operation of this pump is as shown in Fig. 3. When the liquid to be transported enters the main body from the suction port, the first piston moves in the direction of the arrow in Fig. 4 and reaches the position shown in the figure. At this point, the inner surface of the main body The liquid in the cavity 10 formed between the first and second pistons is pressed by the first piston 4 and propels the second piston 7 forward against the spring 8. At this position, the liquid in the cavity 10 with the discharge port 3 opened is pushed out, and when the first piston moves further forward and comes to the position shown in FIG. 5, the extrusion is completed. Next, as shown in Fig. 6, when the first piston starts going backwards and the forward thrust of the second piston is released, the second piston returns to its original position due to the elasticity of the spring 8, and both pistons move again. The state shown in FIG. 1 is reached, and liquid is sucked in.

The above is the operation of the pump of the present invention, but if the liquid to be transported has a medium viscosity as mentioned above, the liquid discharged from the discharge port will normally tend to be pushed out rather than flowed out. It is clear that the feed rate can be varied by adjusting the distance A between the first and second pistons in the final stage of discharge. For example, if the distance A is 0, the entire sucked liquid will be supplied, and if the thickness B of the cavity 10 is 1/3, 2/3 of the sucked liquid will be supplied. Reference numeral 11 denotes an adjustment ring having the above-mentioned interval A, and has a right-hand thread and a left-hand thread engraved on the inner surface of both ends, and these are screwed into the threads on the front ends of the connecting shaft 12 and the piston shaft 5, respectively, to align both shafts in a line. It is connected. Therefore, it is clear that by rotating this adjustment ring, the first piston side moves back and forth and the distance A can be adjusted.

Next, a major feature of the pump of the present invention is that the inside of the pump can be easily cleaned. First and foremost
The piston 4 and the shaft 5 can be removed and easily connected at their rear ends (that is, in this example, they are fixed by screwing the threaded part of the rear end of the shaft 5 with the locking nut 13), and the piston can be easily connected from the rear. By making it possible to remove the cap 15 from the front end of the main body and easily attaching it (in this example, attaching it with the fixing bolt 14), cleaning can be done from the front of the main body if necessary. It is characterized by the fact that

According to the present invention, the liquid to be transported is supplied by skillful use of the first and second pistons, unlike the conventional type that uses plungers and valves, which causes unnecessary retention of the liquid. The big advantage is that there are no parts. In addition, the above-mentioned configuration allows for easy and thorough cleaning after work, and the amount of liquid supplied can be easily adjusted, if necessary, even while the pump is running, so it is particularly useful for medium-viscous target liquids. Useful.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic vertical sectional views for explaining the conventional type, Figure 3 is a vertical sectional side view of essential parts of an embodiment of the pump of the present invention, and Figure 4 is a schematic longitudinal sectional view of the pump of the present invention. FIG. 5 is a side view with a part cut away and a longitudinal section of the main part showing another movement mode of the first and second pistons; FIG. 6 is a partially cutaway side view showing still another movement mode of the first and second pistons. 1...Main body, 2...Suction port, 3...Discharge port, 4...
First piston, 5... Piston shaft, 6... Connection part, 7
...Second piston, 8...Spring, 11...Adjustment ring, 12...Connection shaft.

Claims (1)

[Claims] 1. A cylindrical main body 1 having an easily removable cap 15 at the front end, an open opening at the rear end, and an inlet 2 and an outlet 3 spaced longitudinally; a first piston 4 that is easily removably fixed to the piston shaft 5 and reciprocates within the main body to close the suction port in the forward stroke and open it in the backward stroke; The piston is guided internally by the piston shaft 5, and as the first piston moves forward, it moves back and forth within the main body to open the discharge port, and as the first piston moves back, it moves back due to the elasticity of a spring described below. a second piston 7 configured to close the discharge port; and a spring 8 interposed between the cap 15 and the front end of the second piston to move the piston back; This is a reciprocating pump in which the degree of delivery can be adjusted by rotating a connecting shaft 12 connected to a drive shaft and an adjusting ring 11 screwed onto a piston shaft 5 to connect them.