JPH0868378A - Liquid constant quantity supply device - Google Patents

Abstract

(57) [Summary] [Structure] A constant pressure pumping device (constant flow rate valves 3, 4) for quantitatively pumping a medium liquid suitable for constant pressure pumping, and a diaphragm pump 7 using the medium liquid as a driving liquid. did. [Effect] The diaphragm pump 7 has low stickiness, excellent wear resistance, and can be quantitatively pressure-fed if the flow rate of the driving liquid is constant, so that a medium liquid suitable for constant-pressure feeding can be driven. When used as a liquid, it can be supplied in a fixed amount by using an ordinary device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is easy to stick to equipment,
Alternatively, the present invention relates to a device that supplies a liquid at a constant flow rate that is difficult to supply at a constant flow rate, such as a liquid that easily wears equipment.

2. Description of the Related Art Conventionally, in order to supply a liquid at a constant flow rate, the liquid was sent by a highly quantitative pump such as a gear pump or was controlled at a constant flow rate by a constant flow valve. If the liquid is easy to wear or wears easily, it is not possible to use ordinary gear pumps or constant flow valves, and special equipment using materials with low adhesion or high wear resistance is used. You have to
There was a drawback that the cost was extremely high.

[0002]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to supply a liquid at a constant flow rate, which tends to stick to the equipment or easily wear the equipment, unless special equipment is used. It does not happen.

[0003]

As means for solving such a problem, the present invention provides a constant quantity pumping device for constant quantity pumping of a medium liquid suitable for constant pressure pumping, and a diaphragm using the medium liquid as a driving liquid. It was configured with a pump.

[0004]

The present invention has the above-described structure, and the diaphragm pump has low sticking property, excellent wear resistance, and can be pumped at a constant rate if the flow rate of the driving liquid is constant. By using a medium liquid suitable for constant-pressure pumping as the driving liquid, it is possible to perform constant-quantity supply by using an ordinary device.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a two-liquid mixing type paint pumping apparatus will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a tank for medium liquid suitable for quantitatively pressure-feeding hydraulic oil, and 2 is an air-driven diaphragm pump for pressure-feeding the medium liquid.

Numerals 3 and 4 are constant flow valves for keeping the flow rate constant irrespective of the pressure fluctuation, and are provided in the main liquid medium pressure feeding pipe line 5 and the hardening agent medium liquid pressure feeding pipe line 6, The flow rate ratio is set to be constant, for example, 2: 1.

Reference numeral 7 is a diaphragm pump connected to the respective pipelines 5 and 6, and two bodies 8 and 9 are partitioned by the diaphragms 11 and 12 into paint chambers 21 and 24 and medium liquid chambers 22 and 23, respectively. Cage, both diaphragms 1
1, 12 are connected by a rod 13, and this rod 1
The pilot valve 14 is switched according to 3.

Numeral 10 is a direction switching valve which is switched by pilot air, and is designed so that the pipe lines 5 and 6 are alternately connected to the two liquid medium chambers 22 and 23.

The paint chambers 21 and 24 have check valves 17 and
It is connected to the paint inlet pipe 19 via 18 and is connected to the paint outlet pipe 20 via check valves 15 and 16. The pilot valve 14 is connected to a pilot air supply pipe 25.

The diaphragm pump 7 is constructed as described above, and when the direction switching valve 10 is in the illustrated state, the liquid medium is supplied to the liquid medium chamber 23 of the body 9 so that the diaphragm 12 moves to the right and the body 9 of the body 9 moves. As the volume of the paint chamber 24 decreases, the paint in the check chamber 1
6 is opened and pressure is fed from the paint outlet pipe 20 to a mixer (not shown). The check valve 17 is opened by increasing the negative pressure, and the paint flows in from the paint inlet pipe 19.

Then, the rod 13 moves to the right, the pilot valve 14 is switched, the direction switching valve 10 is switched, and the state opposite to the above is brought about.
12 moves to the left and the paint in the paint chamber 21 is discharged and the paint is sucked into the paint chamber 24. By repeating the above operation, the main agent and the curing agent are continuously pumped by a fixed amount.

As described above, in this embodiment, a medium liquid such as hydraulic oil, which is easily supplied in a fixed amount, is pressure-fed by a constant flow valve to drive a diaphragm pump, which makes it difficult to supply a fixed amount. A fixed amount of paint can be supplied.

Instead of pumping the medium liquid by the diaphragm pump and constant flow rate by the constant flow valve as described above, the medium liquid may be pumped by using a pump capable of supplying a fixed amount such as a gear pump. .

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

[Explanation of symbols]

 1: Tank for medium liquid 2: Pump for medium liquid pressure feeding 3, 4: Constant flow valve 5, 6: Pipe line for medium liquid pressure feeding 7: Diaphragm pump 19: Paint inlet pipe 20: Paint outlet pipe

Claims (1)

[Claims] 1. A constant quantity liquid supply device comprising a constant quantity pressure supply device for constant quantity pressure supply of a medium liquid suitable for constant quantity pressure supply, and a diaphragm pump using the medium liquid as a driving liquid.