JPS6274446A - Quantitative mixing apparatus - Google Patents

Abstract

PURPOSE:To make it possible to quantitatively mixing a substance to be mixed without pressurizing the same, by providing a check valve preventing the flow of the substance to be mixed from a supply cylinder to a mixing substance source to a suction port while providing a check valve preventing the flow of said substance from a second port to the supply cylinder to a supply port. CONSTITUTION:When a piston 15 is retracted, a check valve 16 is opened to suck an ion exchange resin 18 in a supply cylinder 2 from a hopper 3 through a pipe 11 and a suction port 12. A check valve 17 is closed by the pressure of the liquid such as water acting on the check valve 17 from a second port 8. Because the pressure of the liquid such as water flowing in the cylinder 2 from a first port 7 is higher than that of the second port 8, the check valve 17 is opened by the pressure of said liquid to allow the ion exchange resin 18 in the supply cylinder 2 to flow in a flow passage 1 through a supply port 14, a pipe 13 and the second pipe 8.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a quantitative mixing device.

[Conventional technology]

For example, as shown in FIG. 5, a boiler 20 and a pump 2
When injecting a chemical (rust preventive agent, cleaning agent), etc. between the pump 1 and the pump 21, it is necessary to inject it at a pressure higher than the discharge pressure of the pump 21.

However, depending on what you are injecting, you may not want to apply too much pressure. In such cases, for example, a device as shown in FIG. 6 is used.

In this case, normally the valve 22 is opened, the valves 23, 24 are closed and the water is supplied to the boiler etc. by the pump 25 through the channels 26-27-28. When injecting a drug, first open the valves 29 and 30 to drain the water in the tank 31, then close the valve 29, open the valve 32, and inject the drug from the pumper 33 into the tank 31. When the injection of the drug is finished, close the valve 30.32, then open the valve 23.24 (if the valve 24 is a check valve, opening/closing operation is not necessary), and then open the valve 22.
Close.

As a result, water flows from flow path 26 to valve 23 to tank 31 to valve 2.
4- flows through the flow path 28, and the medicine in the tank 31 is carried by this flow of water, making it unnecessary to inject the medicine at a pressure higher than the discharge pressure of the pump 25.

[Problem that the invention seeks to solve]

However, the above device has a problem in that the opening and closing operations of the valve are complicated.

An object of the present invention is to provide a quantitative mixing device that has a simple configuration and can mix a contaminant in a fixed amount without applying pressure.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes a flow path in which the inner diameter of a portion is smaller than that of the other portion, an inlet port that is opened and closed by a piston into which fluid in the flow path flows, and a contaminant that is mixed into the fluid. a supply cylinder having a suction port for the substance and a supply port for the contaminant; a first port is provided at an upstream position of the small diameter portion of the flow path, and the first port is connected to the inflow port; providing a second port downstream of the small diameter portion of the flow path, connecting the second port to the supply port, and providing the suction port with a check valve to prevent flow from the supply cylinder to the source of contaminants; The supply port is also provided with a check valve that prevents flow from the second port to the supply cylinder, so that contaminants sucked from the suction port when the piston of the supply cylinder retreats are removed from the flow path when the inflow port is opened. It is characterized in that it is configured to be mixed into the flow path from the supply port through the second port together with the fluid that has flowed in.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the quantitative mixing device of the present invention. In the figure, numeral 1 is a flow path, 2 is a supply cylinder, and 3 is a hopper.

The flow path 1 is constructed by connecting two single pipes 4a and 4b in series with a connecting means 5 consisting of bolts and nuts, from one end (right side in Figure 1) to the other end (left side in the figure). ) A fluid such as water flows towards the

Single tube 4a, 4. There is an orifice plate 6 between
is interposed, and the inner diameter of the flow path 1 is smaller in the orifice plate 6 part than in other parts, and due to the pressure drop, the pressure at the downstream position (other end side) of the orifice plate 6 is reduced to the upstream position (one end side). The pressure is lower than the pressure on the front side).

Upstream position of orifice plate 6 in flow path 1 (single pipe 4
A first port 7 is provided on the a side), and a second port 8 is provided on the flow path 1 downstream of the orifice plate 6 (on the single pipe 4b side).

An inflow port 10 connected to the first port 7 via a pipe 9 is provided on the outer circumferential surface of the intermediate portion of the supply cylinder 2.
Further, a suction port 12 connected to the popper 3 via a pipe 11 is provided on the end surface of one end, and a supply port 14 connected to the second port 8 via a pipe 13 is provided on the outer peripheral surface of the one end. ing.

The inflow port 10 is opened and closed by the reciprocating motion of the piston 15, and is opened when the piston 15 moves to near the retraction limit position (see FIG. 3). Further, the suction port 12 is provided with a check valve 16, and the supply port 14 is provided with a check valve 17.The check valve 16 prevents the flow from the supply cylinder 2 to the hopper 3, and The check valve 17 prevents flow from the second port 8 to the supply port 14 .

Note that 19 in FIG. 1 is an O-ring. Further, although not shown, the piston 15 is provided with a driving device, and the piston 15 reciprocates by the driving device.

Next, the operation of the above embodiment will be explained with reference to FIGS. 1 to 4.

The hopper 3 is filled with, for example, an ion exchange resin 18 mixed with water, and in order to mix this ion exchange resin 18 into a fluid such as water flowing through the channel 1, the state shown in FIG. 1 must be changed from the state shown in FIG. When the piston 15 is retracted as shown in FIG. 2, the check valve 16 opens and the ion exchange resin 18 is sucked into the supply cylinder 2 from the hopper 3 through the pipe 11 and the suction port 12. At this time, the check valve 17 is closed by the pressure of the fluid such as water acting from the second port 8.

When the piston 15 retreats further, the ion exchange resin 18 is further sucked in, and when the piston 15 moves to near the retreat limit position as shown in FIG. The water flows into the supply cylinder 2 through the port 7, the pipe 9, and the inlet port 10, and the check valve 16 is closed by the pressure of this fluid such as water, stopping the suction of the ion exchange resin 18. In addition, the check valve 17
The pressure of the fluid such as water in the flow path 1 is acting through the second port 8, but the pressure of the fluid such as water flowing in from the first port 7 is higher than that on the second port 8 side. The pressure opens the check valve 17 and the ion exchange resin 18 in the supply cylinder 2 flows through the supply port 14, the pipe 13, and the second port 8.
It flows into the flow path 1 through. This eliminates the need to mix the ion exchange resin 18 by applying a pressure higher than the discharge pressure of a pump (not shown) on the upstream side of the flow path 1.

When most of the ion exchange resin 18 in the supply cylinder 2 has flowed into the flow path 1, the piston 15 is moved forward. As a result, the inflow port 10 is closed (see FIG. 4), and when the piston 15 moves to the forward limit position, the check valve 17 is closed (see FIG. 1).

By repeating this operation, the ion exchange resin 18 is mixed into the fluid such as water flowing in the channel 1.

Note that the mixing amount can be adjusted by changing the inner diameter of the supply cylinder 2, the outer diameter of the piston 15, and the stroke of the piston 15.

In the above embodiment, a case is shown in which one supply cylinder 2 is provided, but if a plurality of supply cylinders 2 are provided and operated in synchronization with each other, continuous VE'1M becomes possible. In addition, although the orifice plate 6 is provided to reduce the inner diameter of a portion of the flow path 1, the inner diameter may be reduced by providing a raised portion on the inner peripheral surface of the flow path 1 or narrowing a portion of the flow path 1. You may. Further, although the case where the ion exchange resin 18 is mixed is shown, the present invention is not limited to this, and it is also possible to mix a chemical such as a rust preventive agent. It can also be applied when flowing gas into the flow path 1 and mixing other gases with this gas. moreover,
As shown in the examples, particles can also be mixed in by mixing with a liquid such as water.

〔Effect of the invention〕

As explained above, according to the present invention, the structure is simple in that it combines a supply cylinder with a flow path that has a small inner diameter, and can be operated simply by reciprocating the piston of the supply cylinder, making it easy to operate. Simple and easy to automate.

In addition, if the contaminants are mixed on the suction side of the pump, they may damage the pump blades, corrode the blades, or the impellers may damage the contaminants, and if the contaminants can only be mixed in on the discharge side of the pump, then the Mixing operations can be performed without applying pressure.

[Brief explanation of drawings]

1 to 4 are partially cutaway side views showing an embodiment of the present invention, and FIGS. 5 and 6 are schematic views of a conventional device. DESCRIPTION OF SYMBOLS 1... Flow path, 2... Supply cylinder, 3... Contaminant source (hopper), 6... Orifice plate, 7...
...First port, 8...Second port, 10...Inflow port, 12...Suction port, 14...Supply port.

Claims (1)

[Claims] A flow path in which the inner diameter of a portion is smaller than that of the other portion;
It is equipped with a supply cylinder having an inlet port opened and closed by a piston into which the fluid in the flow path flows, a suction port for contaminants mixed into the fluid, and a supply port for the contaminants, and the supply cylinder has a small diameter of the flow path. A first port is provided at an upstream position of the section, and the first port is connected to the inflow port, and a second port is provided at a downstream position of the small diameter section of the flow path, and the second port is connected to the supply port. , and the suction port is provided with a check valve to prevent flow from the supply cylinder to the source of contaminants;
The supply port is also provided with a check valve that prevents flow from the second port to the supply cylinder, so that contaminants sucked from the suction port when the piston of the supply cylinder retreats are removed from the flow path when the inflow port is opened. A quantitative mixing device characterized in that it is configured to mix into the flow path from the supply port through the second port together with the fluid that has flowed in.