JPH028149B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention operates in chemical plants, water and sewage facilities, food processing plants, etc. by using the fluid pressure of a predetermined fluid transfer system, and pumps a predetermined amount of other fluid into the fluid transfer system. This invention relates to a metering pump for injecting liquid (medicinal solution, etc.).

Conventionally, as a device for injecting a fixed amount of chemical liquid etc. into a predetermined fluid transfer system, a device that measures the flow rate of the fluid transfer system,
Various types of metering pumps, such as a diaphragm type or a plunger type, are known in which the metering pump is operated intermittently for a predetermined period of time based on the obtained flow rate measurement signal.

In addition, a rotary flowmeter and a magnetic drive control type switching valve device are combined, the rotary flowmeter is attached to a predetermined fluid transfer system, and the flow rate detection output shaft of the flowmeter is connected to the magnetic drive mechanism of the switching valve device. The rotational motion of the flow rate detection output shaft is directly applied as the driving force of the magnetic drive mechanism, and the switching operation of the switching valve device is realized without a power source based on the appropriate flow rate detection of the fluid transfer system. A metering pump with proportional flow rate that drives a diaphragm-operated metering pump that utilizes the fluid pressure of the main fluid transfer system in response to the switching operation of the valve device, and is thereby capable of pumping chemical liquids, etc. to the desired location without the need for a power source. A mechanism has been proposed.

This type of pump mechanism is extremely effective when injecting a fixed amount of a chemical solution in proportion to a predetermined flow rate when the fluid in the main fluid transfer system is in continuous flow or when the fluid transfer time is long even if the fluid is intermittent. It is.
However, the fluid in the main fluid transfer system is an intermittent flow,
Moreover, when the fluid transfer time is short, it becomes necessary to inject a predetermined amount of chemical liquid or the like each time the fluid is transferred. In particular, when the intermittent time is irregular and extends for a long time, such a demand increases. Therefore,
The conventional pump mechanism described above is not effective in satisfying such requirements.

Therefore, the inventors of the present invention have conducted various studies in order to overcome the problems of the conventional devices described above and to obtain a metering pump that is simple and can be operated without a power source. Generates a predetermined fluid pressure, converts this fluid pressure into reciprocating motion via a piston mechanism using a diaphragm,
It has been found that by configuring the metering pump to perform the metering pump operation under the action of the piston mechanism, it is possible to obtain a fluid pressure-driven metering pump that has a simple configuration and performs the reliable metering pump operation.

Therefore, an object of the present invention is to simplify the structure and
To provide a fluid pressure-driven metering pump capable of pumping and supplying a required fluid at an appropriate flow rate ratio every time a predetermined amount of fluid is transferred, and without a power source, during intermittent fluid transfer in a main fluid transfer system.

In order to achieve the above object, the present invention includes: a fluid pressure control section that has a flow path connected to the main flow system and generates a predetermined fluid pressure; and a fluid pressure control section that converts the fluid pressure generated in the fluid pressure control section into reciprocating motion. In a fluid pressure driven pump comprising a fluid pressure drive mechanism section having a pressure chamber and a piston mechanism, and a pump section in which the piston mechanism is inserted into the pump chamber so as to be freely retractable, the fluid pressure control section includes: A flow path is provided that communicates with the fluid inlet and the fluid outlet and the pressure chamber of the fluid pressure drive mechanism section, and a flow rate regulating valve is provided in a part of this flow path, and the fluid outlet of the pump section and the outside are provided. The fluid pressure drive mechanism section defines a pressure chamber through a diaphragm, and fixes one end of a connecting rod to the diaphragm through a piston, and fixes the other end of the connecting rod to the diaphragm. Fix the pump piston through the diaphragm to
A compression coil spring is provided on the outer periphery of the connecting rod to act in repulsion with the fluid pressure, and a passage is further provided to communicate the pressure chamber defined by the diaphragm on the opposite side of the pressure chamber to which the fluid pressure acts and the outside. , the pump section has a fluid suction port and a fluid discharge port, and is characterized in that a part of the pump chamber is provided with an adjustment member for adjusting the volume of the pump chamber.

Next, embodiments of the fluid pressure-driven metering pump according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view of essential parts showing an embodiment of a metering pump according to the present invention. In the embodiment shown in FIG. 1, the metering pump of the present invention has a fluid pressure control section 10.
, a fluid pressure drive mechanism section 12 , and a pump section 14 .

The fluid pressure control unit 10 includes a flow path 16 for connection to a predetermined fluid transfer system, with one end of the flow path 16 serving as a fluid inlet 18 and the other end serving as a fluid outlet 20. A flow rate regulating valve 22 made of a needle valve or the like is provided in a part of the flow path 16. The flow path 16 between the flow rate adjustment valve 22 and the fluid inlet 18 includes
A passage 24 is provided that communicates with a fluid pressure chamber provided in the fluid pressure drive mechanism section 12, which will be described later.

On the other hand, the fluid pressure drive mechanism section 12 is provided with a pressure chamber 26 in the center thereof, and a pump drive diaphragm 28 is provided within this pressure chamber 26. A pressure chamber formed on one side of the pump driving diaphragm 28 communicates with a passage 24 provided in the fluid pressure control section 10, while a piston 3 is formed on the other side of the diaphragm 28.
At the same time, a connecting rod 32 connected to a pump piston provided in the pump section 14, which will be described later, is fixed. A compression coil spring 34 is inserted between the piston 30 and the inner wall surface of the pressure chamber 26 on the outer periphery of the connecting rod 32, and a compression coil spring 34 is inserted between the piston 30 and the inner wall surface of the pressure chamber 26.
8 is constructed so that return elasticity acts on the pressure chamber side where fluid pressure always acts.

The pump section 14 includes a pump chamber 36 and fluid suction ports 38 that communicate with the pump chamber 36.
and a fluid discharge port 40. A piston 42 is disposed in the pump chamber 36 so as to be movable forward and backward. This piston 42 is connected to a diaphragm 4 provided for liquid-tightly sealing the pump chamber 36 side and the pressure chamber 26 side.
4 and is also fixed to a connecting rod 32 provided on the fluid pressure drive mechanism section 12. In addition, pump chamber 3
6 is provided with an adjustment member 46 for adjusting the volume of the pump chamber, that is, the pump discharge amount. Note that the fluid suction port 38 and the fluid discharge port 40 are provided with connectors 48 and 50 for communicating with an external system as appropriate.
These connectors 4 are attached removably.
Check valve 5 consisting of a poppet valve in relation to 8 and 50
2 and 54 are provided, respectively.

In addition, in the above-mentioned embodiment, the fluid pressure control section 10, the fluid pressure drive mechanism section 12, and the pump section 14 are each manufactured separately for manufacturing convenience, and these are fixed integrally. .

Next, the operation of the pump constructed as described above will be explained.

First, the fluid inlet 18 and the fluid outlet 20 of the fluid pressure control section 10 are connected to a predetermined fluid transfer system, and the fluid suction port 38 of the pump section 14 is connected to a chemical supply system, and the fluid discharge port 40 shall be communicatively connected to a portion of the fluid transfer system.

Now, assuming that fluid flows into the fluid inlet port 18 of the fluid pressure control section 10, the inflow fluid pressure of this fluid increases in the flow path 16 under the action of the flow rate adjustment valve 22. Therefore, pressure fluctuations (positive pressure) occur within the flow path 16, and this pressure fluctuation acts on the pressure chamber 26 via the passage 24. In this way, when a predetermined fluid pressure acts on the pressure chamber 26, the piston 30, which is integrally formed with the diaphragm 28, is displaced against the elasticity of the compression coil spring 34, and the pump part is moved through the connecting rod 32. 14 pistons 42 are advanced into the pump chamber 36. In this case, piston 4
If a predetermined amount of the chemical liquid is held in the pump chamber 36 in the retracted state of 2, the chemical liquid corresponding to the volume change in the pump chamber 36 caused by the piston 42 is discharged from the fluid discharge port 40, and a predetermined amount of the chemical liquid is delivered to the fluid transfer system. The drug solution will be injected. In this case, a branch passage 56 that communicates with the outside is provided in a part of the passage 16 that communicates with the fluid outlet 20 of the fluid pressure control unit 10, and this passage 56 and the fluid outlet 40 of the pump unit 14 are communicated with each other. Once connected, the chemical liquid injection piping can be easily connected to the fluid transfer system.

Next, when the supply of fluid to the fluid pressure control unit 10 is cut off, the predetermined fluid pressure acting on the pressure chamber 26 is reduced, so that the diaphragm 28 is moved by the return elasticity of the compression coil spring 34 to the piston 3.
0 and returns to the predetermined position. At this time, the piston 42 located in the pump chamber 36 also retreats to a predetermined position, and a predetermined amount of the chemical liquid is sucked into the pump chamber 36 through the fluid suction port 38 in preparation for the next discharge.

In this way, each time a predetermined fluid is applied to the fluid pressure control section 10 intermittently, the pump section 14
A metering pump operation is performed at . Moreover, this pump operation can be performed without a power source using fluid pressure. In addition, in this case, pressure chamber 2
The fluid pressure applied to 6 can be adjusted as appropriate by the flow rate adjustment valve 22. Further, the pump discharge amount of the pump unit 14 that performs the metering pump operation can be variably set by adjusting the volume of the pump chamber 36 using the adjustment member 46.

In the embodiment described above, the fluid pressure control section 10
In the above description, the fluid inlet 18 is closed and the fluid outlet 20 is connected to a predetermined fluid transfer system as part of the flow path of the fluid transfer system.
only by connecting it in communication with a part of a predetermined fluid transfer system,
It is also possible to configure the pressure chamber 26 to apply a predetermined pressure fluctuation (positive pressure). Further, the fluid inlet 18 and the fluid outlet 20 are all closed, and a passage 58 (indicated by a broken line) is provided which communicates with the chamber on the opposite side of the pressure chamber 26 where the pressure fluctuation (positive pressure) is applied. By communicating the passage 56 with a portion of a predetermined fluid transfer system that generates negative pressure fluctuations, the metering pump operation can be performed in response to pressure fluctuations (negative pressure) in the fluid transport system in the same manner as in the embodiment described above. . In this case, the flow path 16 of the fluid pressure control section 10 communicates with the atmosphere through the through hole 56 and is maintained at atmospheric pressure.

As is clear from the foregoing, the fluid pressure-driven metering pump of the present invention performs pump operation by utilizing pressure fluctuations in the fluid transfer system, and moreover, injects liquid medicine, etc. into the liquid transfer system that causes pressure fluctuations. Therefore, in order to properly operate the pump against pressure fluctuations, it is necessary to satisfy the following conditions.

Effective cross-sectional area of the pump driving diaphragm 28 Acm ² Effective cross-sectional area of the pump operating side diaphragm 44 Bcm ² Resistance of the compression coil spring 34 CKg When pressure fluctuation (positive pressure) is PKg/cm ² P×A>(B×P )+C...(1) When the pressure fluctuation (negative pressure) is ΔPKg/ ^cm2 ΔP×A>(ΔP×B)-C...(2) Therefore, based on the pressure fluctuation, the above formula (1) It is preferable to design the pump of the present invention so as to satisfy (2).

Next, an application example of the fluid-pressure-driven metering pump of the present invention having excellent operating characteristics as described above will be described.

FIG. 2 shows a main fluid transfer system led out from a water storage tank 60 via a pump 62, in which a metering pump 64 of the present invention is connected to the discharge side of the pump 62. That is, in this example, the metering pump 6
The fluid pressure control unit 4 is configured as a part of the main fluid transfer system, and the metering pump 64 performs a metering pump operation by the operation of the pump 62 that is driven intermittently, and transfers a predetermined amount of the chemical liquid from the chemical liquid storage tank 66 to the main fluid transfer system. can be injected into the transfer system.

FIG. 3 shows a metering pump 64 of the present invention connected to the same main fluid transfer system as in FIG. 2, but in this example, the fluid inlet 18 of the metering pump 64 is closed off. It is configured so that the fluid discharged from the pump 62 of the main fluid transfer system acts on the fluid outlet 20. With this configuration as well, it is possible to inject the medicinal liquid into the main fluid transfer system similarly to the example shown in FIG.

FIG. 4 shows a metering pump 64 of the present invention on the suction side of the pump 62 in the same main fluid transfer system as in FIG.
is connected. In this case, metering pump 6
The fluid inlet 18 and the fluid outlet 20, which serve as the fluid pressure control section of No. 4, are closed, and the suction fluid of the pump 62 of the main fluid transfer system is applied to the passage 58 communicating with the pressure chamber of the fluid pressure drive mechanism section. It is structured like this. Even with this configuration,
Similar to the example shown in FIG. 2, a drug solution can be injected into the main fluid transfer system. In this case, the chemical solution is injected into the discharge side of the pump 62 of the main fluid transfer system.

FIG. 5 shows a modified application example of the metering pump 64 of the present invention, in which the water supply system is communicated with a water tank 70 via an automatic valve 68, and stored water is discharged from the water tank 70 via a pump 72 as appropriate. In the main fluid transfer system configured as above, a metering pump 64 of the present invention is connected between the automatic valve 68 and the water storage tank 70. In this example, the main fluid transfer system is connected to the metering pump 64 as in the example shown in FIG.
When water is supplied by opening the automatic valve 68 under the action of the level switch 74 as the stored water is drained, a chemical solution can be injected into the main fluid transfer system.

FIG. 6 shows a further modified application example of the metering pump 64 of the present invention, in which water is supplied by head via an automatic valve or a manual valve 78 from a water storage tank 76 configured to always store a predetermined amount of water. The metering pump 64 of the present invention is connected to a main fluid transfer system configured to perform the following steps. With this configuration as well, it is possible to inject the medicinal liquid into the main fluid transfer system similarly to the example shown in FIG.

As is clear from the various application examples described above, the fluid pressure-driven metering pump according to the present invention can operate the metering pump by the action of fluid pressure for each intermittent flow in a main fluid transfer system that generates various types of intermittent flows. It is possible to reliably inject chemicals, etc. Therefore, the metering pump of the present invention can be used in human waste processing equipment such as trains and ships,
It can be suitably applied as a quantitative injection mechanism for chemical solutions in water-washing human waste treatment equipment, automatic dishwashing systems, various beverage vending machines, and the like.

In particular, the metering pump of the present invention has a simple structure, so it can be manufactured at low cost, and since it operates without a power source, there is no need for maintenance, and the metering pump can operate with high precision over a long period of time. It has many advantages such as being able to be held stably.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing one embodiment of a fluid pressure driven metering pump according to the present invention, and FIGS. 2 to 6 are system diagrams showing various application examples of the metering pump of the present invention. 10... Fluid pressure control section, 12... Fluid pressure drive mechanism section, 14... Pump section, 16... Channel, 18...
...Fluid inlet, 20...Fluid outlet, 22...Flow rate adjustment valve, 24...Passway, 26...Pressure chamber, 28
... Pump drive diaphragm, 30 ... Piston, 32 ... Connection rod, 34 ... Compression coil spring,
36...Pump chamber, 38...Fluid suction port, 40...
... Fluid discharge port, 42 ... Piston, 44 ... Diaphragm, 46 ... Adjustment member, 48, 50 ... Connector, 52, 54 ... Check valve, 56 ... Passage, 5
8...Aisle, 60, 70, 76...Water tank, 6
2, 72... Pump, 64... Metering pump of the present invention, 66... Chemical solution storage tank, 68... Automatic valve, 74...
...Level switch, 78...valve.

Claims (1)

[Claims of Claims] 1. A fluid pressure control unit that has a flow path connected to the main flow system and generates a predetermined fluid pressure, a pressure chamber and a piston mechanism that converts the fluid pressure generated in the fluid pressure control unit into reciprocating motion. A fluid pressure driven pump comprising a fluid pressure drive mechanism section having a fluid pressure drive mechanism section and a pump section in which the piston mechanism is inserted into the pump chamber so as to be freely retractable, the fluid pressure control section having a fluid inlet and a fluid flow port. A flow path is provided that communicates with the outlet and the pressure chamber of the fluid pressure drive mechanism section, a flow rate adjustment valve is provided in a part of this flow path, and a path that can be externally connected to the fluid discharge port of the pump section is provided. The fluid pressure drive mechanism defines a pressure chamber through a diaphragm, and fixes one end of a connecting rod to the diaphragm through a piston, and connects a pump to the other end of the connecting rod through the diaphragm. Fix the piston for
A compression coil spring is provided on the outer periphery of the connecting rod to act in repulsion with the fluid pressure, and a passage is further provided to communicate the pressure chamber defined by the diaphragm on the opposite side of the pressure chamber to which the fluid pressure acts and the outside. . A fluid pressure-driven metering pump, wherein the pump section includes a fluid suction port and a fluid discharge port, and an adjustment member for adjusting the volume of the pump chamber is provided in a part of the pump chamber.