JPS6148633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a pump that transfers liquid by the pressure action of a pump operating body such as a piston, plunger, or diaphragm and by opening and closing a suction valve and a discharge valve.

Conventionally, for example, as shown in the third figure, the casing a
A structure in which a suction side check ball valve b and a discharge side check ball valve c, which sink and close in the processing liquid, are provided at the bottom and top of the casing a, respectively, and a diaphragm d which is reciprocated is placed 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 will flow to the lower side of the suction side check ball valve b or the discharge side check ball valve. There was a drawback that the liquid accumulated under the gas cylinder c, causing a gas lock, making it impossible to transfer the liquid unless the gas was vented.

An object of the present invention is to provide a pump for bubble-generating liquid that can prevent the occurrence of gas lock and always perform normal liquid transfer, and its characteristics are as follows:
A suction port is provided in the upper part of the casing via a check valve, and a discharge port is provided in the lower part via a check valve, and at least the check valve on the suction side is
A valve body, which floats in the processing liquid, is inserted into a valve chamber having a valve seat at its upper part so as to be movable up and down in order to come into contact with and separate from the valve seat. Embodiments of the present invention will be described below with reference to drawings showing a reciprocating pump using a diaphragm.

In FIG. 1, the pump A of the present invention has a lumen 2 extending vertically in a casing 1, and a liquid suction port 4 is connected to the upper end of the lumen 2 via a suction side check valve 3. A liquid discharge port 6 is connected to the lower end of the lumen 2 via a discharge side check valve 5, and a diaphragm 8 is connected to one side of the lumen 2 via a porous wall 7 so as to be able to reciprocate toward the lumen. It's equipped.

The structure of the suction side check valve 3 is as follows. A box-shaped valve chamber 9 is connected in communication between the upper end of the casing inner cavity 2 and the suction port 4, and a valve seat 10 is formed at the communication port of the valve chamber 9 with the suction port 4, A ball-shaped valve body 11 floating in the processing liquid is inserted into the valve chamber 9 so as to be movable up and down. The other discharge side check valve 5 also connects a box-shaped valve chamber 12 between the lower end of the casing inner cavity 2 and the discharge port 6 in a communicating state with them, and has a valve at the communication port of the valve chamber 12 with the inner cavity 2. A seat 13 is provided, and in this example, a ball-shaped valve body 14 that floats in the processing liquid is inserted into the valve chamber so as to be movable up and down.

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

A pump shaft 15 is slidably supported by a bearing 16 behind the diaphragm 8, and its tip is connected to the center of the diaphragm 8.
The rear end surface is constantly pressed against the eccentric cam 18 by the coil spring 17. The rotation of the eccentric cam 18 is transmitted from the motor.

The bubble-generating liquid pump A of the present invention is used as follows, for example. As shown in the second diagram, a tank 19 containing a liquid that generates bubbles and a pump A of the present invention
The suction port 4 of the pump A is connected by a suction pipe 20 with a head difference between the two, and the gas vent pipe 21 connected to the suction port 4 is vertically raised to a higher position than the tank 19. A discharge pipe 22 connected to the outlet 6 is extended to a predetermined position via a back pressure valve 23. In this case, the discharge pipe 22 may be extended to a higher position than the tank 19, and the back pressure valve 23 may be omitted if the siphon phenomenon does not occur.

The action of the pump A of the present invention will now be explained below.
When the bubble-generating liquid 9 fills the casing inner cavity 2 and the valve seats 9, 12 through the suction pipe 20, the valve bodies 11, 14 on the suction side and the discharge side are in the upper part of each valve chamber 9, 12. rise to each valve seat 10, 13
is in contact with In this state, when the diaphragm 8 is reciprocated by the rotation of the eccentric cam 18, when negative pressure is applied to the inner cavity 2 due to the retraction of the diaphragm 8, the discharge side valve body 14 is closed by the negative pressure and buoyancy. While maintaining this state, the suction-side valve body 11 is lowered and opened by the negative pressure against its buoyancy, thereby sucking liquid into the inner cavity 2 from the suction port 4, and then moving the diaphragm 8 forward to open the inner cavity. When positive pressure is applied inside 2, the suction side valve body 11 is raised and closed by the positive pressure and buoyancy, while the discharge side valve body 14 is lowered and opened by the positive pressure against the buoyancy. Thereby, the liquid inside the casing is forced to be fed through the discharge port 6. Bubbles generated from the liquid in the casing inner cavity 2 and the discharge pipe 22 rise in the liquid and reach the lower surfaces of the valve bodies 11 and 14 to form a bubble layer, and this bubble layer forms a bubble layer in the valve bodies 11 and 14. 14 respectively lose their buoyancy and drop slightly to open the valves, so that the bubble layer rises in the liquid through the opened valves. and is emitted into the atmosphere.
Since the above bubble evacuation action is always performed automatically, there is no accumulation of air bubbles in the casing inner cavity 2 and valve seats 9 and 12, thereby allowing normal suction and discharge to continue without causing gas lock. do.

In this embodiment, the ball-shaped valve body 14 that floats in the processing liquid is also used for the discharge side check valve 5, but when there is no need to discharge air bubbles generated in the discharge pipe 22 through the gas vent pipe 21, In this case, it is not necessary to use a ball-shaped valve body 14 that floats in the processing liquid; for example, a spring is attached below a normal ball-shaped valve body, and when positive pressure is applied to the inside of the inner cavity 2, A structure in which the spring contracts and the liquid is discharged from the discharge port 6 may also be used.

According to the bubble-generating liquid pump of the present invention, even if bubbles generated from the processing liquid accumulate in the pump,
The valve element on the suction side, which floats in the liquid to be treated, opens and can immediately discharge the liquid to the outside of the pump, thereby preventing the occurrence of gas lock and allowing normal suction and discharge of the liquid to continue even when the liquid is bubbly. This is possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal side view, FIG. 2 is a piping diagram in use, and FIG. 3 is a schematic vertical 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.

Claims (1)

[Scope of Claims] 1. A liquid suction port is provided in the upper part of the casing inner cavity via a check valve, and a liquid discharge port is provided in the lower part via the check valve, and a liquid inlet is provided in the lower part of the casing inner cavity via a check valve. A pump operating body is provided to alternately apply positive and negative pressures to the liquid, and at least the check valve on the suction side has a valve element floating in the processing liquid in a valve chamber having a valve seat on the upper part, and a valve element floating in the processing liquid is brought into contact with and separated from the valve seat. A pump for bubble-generating liquid that can be inserted into the pump so that it can be raised and lowered as much as possible.