JPS58180783A - Constant quantity pump - Google Patents

Abstract

PURPOSE:To prevent the occurrence of gas lock when bubbles produced from bubble generating liquid are accumulated in a pump, by opening an intake side valve body having buoyance in the liquid to discharge the bubbles out of the pump. CONSTITUTION:Bubbles produced from liquid in a bore 2 of a casing ascend in the liquid to form a bubble layer on the lower surface of a valve body 11. The valve body 11 loses buoyancy and somewhat descends to open a valve so that the bubble layer ascends in the liquid through the opened valve and passes through a intake side check valve 3 and a gas vent pipe to be discharged into the atmosphere. Since the bubble discharging action is carried out normally automatically, the bubbles are not accumulated in the bore 2 of the casing and a valve chamber 9 so that gas lock do not take place and normal intake and discharge are continued.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a pump that transfers liquid by opening and closing a valve and a discharge valve.

The structure includes a suction side check ball valve (b) and a discharge side check ball valve (Q) that sink and close, and a diaphragm (d) that is reciprocated on one side of the casing (a). A reciprocating pump is generally known, but when this conventional pump is used to transfer a liquid that generates bubbles, such as sodium hypochlorite, the generated bubbles are transferred to the lower side of the suction side check ball valve (b) or the discharge side check ball. This has the drawback that the liquid accumulates under the valve (C), causing a gas lock and making it impossible to transfer the liquid unless the gas is vented.

An object of the present invention is to provide a metering pump that can prevent the occurrence of gas lock and always perform normal liquid transfer, and its characteristics are as follows.

A liquid suction port and a liquid discharge port are provided in the upper part of the casing inner cavity via check valves, and a pump is operated on one side of the casing inner cavity to alternately apply positive and negative pressure to the liquid in the inner cavity. The suction 'fliU check valve has a valve body which substantially floats in the transferred liquid and is inserted into a valve chamber having a valve seat at the upper part thereof so as to be movable up and down to come into contact with and separate from the valve seat, The check valve on the discharge side is located in a valve chamber that has a valve seat at the bottom.

A valve element that substantially sinks in the transferred liquid is inserted so as to be movable up and down in order to come into contact with and separate from the valve seat. It's there. The present embodiment will be described below with reference to one aspect implemented in a reciprocating pump using a diaphragm.

In FIGS. 1 and 2, the two pumps (A) of the present invention are:
A flat inner cavity (2) is formed in the casing (1), and a liquid suction port (4) and a discharge side check valve (5) are connected to the tip of the inner cavity (2) via a suction side check valve (3). ) is connected to the liquid discharge port (6), and a diaphragm (8) is installed on the D- side of the lumen (2) through a porous wall (7) so as to be able to reciprocate along the lumen. The structure of the suction side check valve (3) is as follows.

A box-shaped valve chamber (9) is connected between the upper end of the casing inner cavity (2) and the suction port (4) in communication with them, and the valve chamber (9) communicates with the suction port (4). A valve seat (10) is formed at the mouth, and a ball-shaped valve body (1) that substantially floats in the transferred liquid is inserted into the valve chamber (9) so as to be able to rise and fall. On the other hand, the discharge side check valve (5) is connected to the casing inner cavity (
2) A box-shaped valve chamber (12) is connected between the upper end and the discharge port (6) in communication with them, and the lumen (2) of the valve chamber (12) is connected to the upper end and the discharge port (6).
A valve seat (13) is provided at the communication port with the valve chamber, and a ball-shaped valve body (14) which is substantially submerged in the transferred liquid is inserted into the valve chamber so as to be able to rise and fall freely.

The valve bodies (11) and (14) are hollow or solid bodies made of various materials such as synthetic resins such as polyethylene, vinyl chloride, Teflon, polystyrene, and polypropylene, metals, and ceramics.

Its shape is not limited to a spherical shape, but may be various other shapes.

(15) is a pump shaft that is slidably supported by a bearing (16) behind the diaphragm (8), and its tip is connected to the center of the diaphragm (8) and is supported by a coil spring (17). The rear end surface is constantly pressed against an eccentric cam (1 day). The rotation of the eccentric cam (1 day) is transmitted from the motor.

The metering pump (Shu) of the present invention is used as follows, as an example. As shown in the third diagram, the tank (19) containing the liquid that generates bubbles and the suction port (example) of the pump (A) of the present invention are connected. A head is provided between the two and they are connected by a suction pipe (20), and
The gas vent pipe (21) connected to the suction port (4) is vertically raised to a higher position than the tank (19), and the pump (
A discharge pipe (22) connected to the discharge port (6) of , A) is extended to a predetermined position via a back pressure valve (23). In this case, the discharge pipe (22) is extended to a higher position than the tank (19), and if the supply point is higher than the water level of the tank (19), the back pressure valve (23) is
) may be excluded.

The operation of the pump (4) of the present invention will be explained next. Denomination (19
) is filling the casing inner cavity (2) and the valve chambers (9) and (12) through the suction pipe (2o), the suction side valve body (11) is inside the valve chamber (9). It rises to the top of the valve due to its buoyancy and touches the valve seat (1o).
The discharge side valve body (14) sinks to the lower part of the valve chamber (12) due to its own weight and is in contact with the valve seat (13). In this state, when the diaphragm (8) is reciprocated by the rotation of the eccentric cam (1), when negative pressure is applied to the inner cavity (2) of the diaphragm (8), the discharge side valve Body (14
) is kept in a closed state by the negative pressure and its own weight, while the suction side valve body (11) is lowered and opened by the negative pressure against its buoyancy, thereby allowing liquid to flow out from the suction port (4). Lumen (2
), and then when positive pressure is applied to the inner cavity (2) by advancing the diaphragm (8), the suction side valve body (11)
is raised and closed by the positive pressure and buoyancy, while the discharge side valve body (14) is raised and opened by the positive pressure against its own weight, thereby draining the liquid in the casing to the discharge port (6).
Pressure-fed from Air bubbles generated from the liquid in the casing inner cavity (2) rise in the liquid and reach the lower surface of the valve body (11) to form a bubble layer, and this bubble layer forms a bubble layer in the valve body (11).
11) loses its buoyancy and drops slightly to open the valve, so that the bubble layer passes through the opened valve and rises in the liquid, and the bubbles that have passed through the suction side chatter valve (3) in this way are transferred to the gas vent pipe. (21) and is discharged into the atmosphere. Here, in order to make it easier to remove air bubbles from the casing inner cavity, the valve chamber (9) is inserted into the valve chamber (9).
12) It is best to tilt it slightly upward. Since the above-mentioned bubble evacuation action is always performed automatically, there is no accumulation of bubbles in the casing inner cavity (2) and valve chamber (9), thereby preventing gas lock and allowing normal suction and discharge. Continue.

According to the metering pump of the present invention, even if bubbles generated from the bubble-generating liquid accumulate inside the pump.

The suction side valve body, which has buoyancy in the liquid, opens and can immediately discharge the liquid to the outside of the pump, thereby preventing the occurrence of gas lock and continuing normal suction and discharge of bubbly liquid. It is possible.

[Brief explanation of the drawing]

1, 2, and 3 are C-C of the first embodiment of this invention.
FIG. 3 is a detailed cross-sectional view, FIG. 3 is a piping diagram in use, and FIG. 4 is a longitudinal sectional side view of a conventional pump. 2...Casing inner cavity 3...Suction side check valve 4...Liquid suction port 5...Discharge side check valve 6...Liquid discharge port 8...Diaphragm 9.12...Valve chamber 10.13... Valve seat 11.14... Valve body 0 Embroidery 2 Figure 3 Figure I14V

Claims (1)

[Claims] A liquid suction port and a liquid discharge port are provided in the upper part of the casing inner cavity via check valves, and positive and negative pressures are alternately applied to the liquid in the inner cavity on one side of the casing inner cavity. The check valve on the suction side has a valve element that substantially floats in the transferred liquid inserted into a valve chamber having a valve seat on the upper part so as to be able to move upwardly and downwardly toward and away from the valve seat. The check valve on the discharge side is located inside the valve chamber that has a valve seat at the bottom. A metering pump 0 in which a valve body that substantially sinks in the transferred liquid is inserted so as to be movable up and down in order to bring it into contact with and away from the valve seat.