JPH054008Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention is used in chemical plants, water and sewage facilities, food processing plants, etc., to supply other liquids (chemical liquids, etc.) to the main fluid transfer system at a predetermined flow rate. This invention relates to a quantitative injection control device for mixing.

[Prior art and its problems]

Conventionally, as a device for injecting a fixed amount of medicinal liquid into a predetermined fluid transfer system, the flow rate of the fluid transfer system is measured, and based on the obtained flow rate measurement signal, a metering injection pump such as a diaphragm type or a plunger type is intermittently operated for a predetermined period of time. It is known that the device is configured to operate in the following manner.

Applicants first attached an eccentric cam to the pointer shaft of a rotary flowmeter, and on the other hand, connected a valve casing with a built-in general needle valve mechanism to the flowmeter in a liquid-tight manner, and connected this joint to the flowmeter. A fluid chamber is formed which houses the eccentric cam and is filled with the fluid of the main fluid transfer system to which the flow meter is connected, and the valve casing is provided with the fluid chamber, the drive pressure chamber of the diaphragm-operated metering pump, and the drainage system, respectively. A water passage communicating with the fluid chamber is provided, and a slide cam that engages with the eccentric cam to move forward and backward is provided, and the operation of the slide cam opens and closes the needle valve mechanism in the valve casing and the water passage communicating with the fluid chamber. Developed a flow rate proportional metered injection control device that can directly operate the metering pump by opening and closing the valves respectively, and thereby can pressure-feed a prescribed chemical solution, etc. to a desired location, Jikai Show 56
-A utility model registration application was filed as Publication No. 122111.

However, the above-mentioned metering injection control device is provided with a fluid chamber that introduces fluid in the main flow system at the joint between the rotary flowmeter and the switching valve mechanism, and the fluid in this fluid chamber is directly supplied as a drive source for the metering pump. Since the control system is configured to be discharged, there is an advantage that the control system can be simplified and equipment costs can be reduced, but the pipe diameter of the control water passage must be made small due to the water pressure of the main system. The drawback is that only small metering pumps can be used.

Further, in the above-mentioned metered injection control device, the rotary flowmeter has a configuration in which a water wheel is disposed within the fluid passage, and a gear mechanism is connected to the spindle of the water wheel,
One of the gear shafts of a gear mechanism that rotates at a predetermined period in proportion to the flow rate of the fluid transferred in the fluid passage is used as an output shaft, an eccentric cam is attached to the output shaft, and a slide cam is attached to the eccentric cam. It was engaged. For this reason, when the diameter of the control water passage is increased, the force required to open and close the valve increases, which not only increases wear on the gear mechanism and shortens the life of the rotary flowmeter, but also increases the flow rate. The accuracy of proportionality deteriorates. Particularly, when the pressure of the main flow system is high, the accuracy of flow rate proportionality also decreases significantly. Therefore,
It is difficult to increase the amount of control water supplied and discharged, and it is also impossible to increase the number of times a metering pump operates per unit time or to operate a large metering pump, making it difficult to inject large volumes of chemical solutions. That was impossible.

[Purpose of invention]

The purpose of this invention is to improve the previously proposed flow rate proportional metering injection control device, and to configure it so that the fluid that controls the metering pump independently of the control fluid is supplied directly from the main flow system, and to It has been improved so that it can drive the required fluid without power supply at a constant flow rate ratio with high accuracy to the flow rate of the main flow system, and can also add high concentration of the required fluid to the main flow system. The present invention provides a flow rate proportional metering injection control device.

[Key points of the idea]

In order to achieve the above object, the flow rate proportional metered injection control device according to the present invention includes a fluid passage section 40, a water wheel 42 rotatably disposed within the fluid passage section,
A main flow system comprising a gear mechanism 46 connected to the support shaft 44 of this water turbine, with one of the gear shafts 46a of the gear mechanism rotating at a predetermined period in proportion to the flow rate of the fluid transferred in the fluid passage section as an output shaft. A rotary flowmeter 12 that detects the flow rate of the flowmeter is connected to the rotary flowmeter 12 through a fluid chamber 52 that introduces fluid in the main flow system, and is provided with a control water supply port 16 and a drain port 18, and has an internal structure. A valve casing 5 in which a fluid passageway 54 and a drainage passageway 58 are bored.
A needle valve 56 is arranged in the drainage channel 58 to keep the drain port 18 closed at all times, and a slide cam is provided in the fluid chamber 52 to simultaneously open and close the water passage 54 and the needle valve 56. 70, and the switching valve mechanism 14 is configured such that the slide cam 70 engages with the eccentric cam 48 pivoted on the output shaft 46a of the rotary flowmeter 12 so as to be movable forward and backward in a fixed direction; and diaphragms 92 and 100, respectively. A pair of chambers 94, 96 and 108, 106 defined by
, each one of the chambers 94 and 108 is connected in communication with the control water supply pipe 32 led out from the control water supply port 16 of the switching valve mechanism 14, and the other chambers 96 and 106 are supplied with a main flow fluid. A water supply valve 28 and a drain valve 30 configured to introduce a part of the valve and open/close the valve by deflecting the diaphragm by the operation of the switching valve mechanism 14; Pump drive diaphragm 114 in communication with each other chamber 96 and 106 via conduits 98 and 110
A metering pump 20 is configured to have a drive pressure chamber 118 defined by a main flow, and a pump operation rod 120 is attached to the diaphragm 114 to deflect the pump operation diaphragm 116 to perform pump operation. The present invention is characterized in that the metering pump 20 is configured to perform pumping operation so as to pump the required fluid at a predetermined flow rate ratio to the flow rate of the system.

In the above-mentioned flow rate proportional metered injection control device, the opening and closing of the passageway 54 in the switching valve mechanism 14 can be configured to be performed by a ball valve 68 that is interlocked with the slide cam 70. On the other hand, the needle valve 56 provided in the drainage channel 58 can be opened and closed by an operating rod 66 that is interlocked with the slide cam 70 and inserted into the valve casing 50 in a fluid-tight manner.

The water supply valve 28 also includes a diaphragm operating pressure chamber 94 defined by a diaphragm 92 and a fluid introduction chamber 9.
6, and a control water supply pipe 3 led out from the control water supply port 16 of the switching valve mechanism 14 to the pressure chamber 94.
2 are connected in communication, and the fluid introduction chamber 96 and the drive pressure chamber 118 of the metering pump 20 can be opened and closed by deflection of the diaphragm 92. On the other hand, the drain valve 30 has a diaphragm operating pressure chamber 108 defined by the diaphragm 100.
and a fluid outlet chamber 106 provided with a valve mechanism 104, a control water supply pipe 32 led out from a control water supply port 16 of the switching valve mechanism 14 is connected to the pressure chamber 108, and the deflection of the diaphragm 100 is controlled. Accordingly, the fluid outlet chamber 106 and the drive pressure chamber 118 of the metering pump 20 can be opened and closed via the valve mechanism 104. In this case, the water supply valve 28 and the drain valve 30 are configured to alternately open and close by simultaneously supplying or stopping the control water derived from the control water supply port 16 of the switching valve mechanism 14, and the metering pump Pumping can be accomplished by directly introducing and discharging fluid in the main flow system into the drive pressure chambers 118 of 20.

[Example of idea]

Next, an embodiment of the flow rate proportional metered injection control device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows one embodiment of the device of the present invention, and is a system diagram of a flow rate proportional metering injection device configured to meter a chemical solution such as a sodium hypochlorite solution into a water supply system. In FIG. 1, reference numeral 10 indicates a water system, and a rotary flow meter 12 is connected to a part of this water system 10. As will be described later, the rotary flowmeter 12 is integrally equipped with a switching valve mechanism 14 operated by a flow rate detection output shaft. It is constructed so that a portion of the pressure water of the system 10 can be introduced, and is provided with a control water supply port 16 and a drain port 18, respectively. On the other hand, the water system 10
Other parts include diaphragm-driven metering pump 2
The discharge pipe 22 of the metering pump 20 is connected in communication with the metering pump 20, and the suction pipe 24 of the metering pump 20 is connected in communication with a chemical storage tank 26. However, in the present invention, a driving water supply pipe 32 and a driving water drain pipe 34 are connected to the diaphragm driving pressure chamber provided inside the metering pump 20 via predetermined water supply valves 28 and drain valves 30, respectively. The drive water supply pipe 32 is directly connected to another part of the water system 10. Moreover, the water supply valve 28 and the drain valve 30 include the switching valve mechanism 14.
The control water supply pipes 36 led out from the control water supply ports 16 are branched and connected to each other, and are configured to be alternately controlled to open and close. Note that an external drainage system 38 is appropriately connected to the drainage port 18 of the switching valve mechanism 14 to drain the control water. Therefore, in the present invention, the water supply valve 28 and the drain valve 30 are controlled to open and close under the action of the switching valve mechanism 14, and the drive water introduced directly from the water supply system 10 is transferred to the metering pump 20.
Pumping operation of the metering pump 20 can be achieved by transferring the liquid to the diaphragm-driven pressure chamber of the metering pump 20.

FIG. 2 shows an embodiment of a rotary flowmeter 12 equipped with the switching valve mechanism 14. The flowmeter 12 is rotated by the flow of tap water in a fluid passage section 40 that guides and transfers tap water. A gear mechanism 46 is provided that interlocks with the shaft 44 of the water wheel 42. The gear mechanism 46 includes a gear shaft 46a that rotates at a predetermined rotation period corresponding to the rotation speed of the water wheel 42 that rotates in proportion to the flow rate of fluid. An eccentric cam 48 that operates a switching valve mechanism 14, which will be described later, is attached to the tip of the gear shaft 46a.
For the main body of the flowmeter 12 configured in this way,
The valve casing 50 is liquid-tightly connected, and a fluid chamber 52 is defined at this joint. Note that this fluid chamber 52
The eccentric cam 48 is located therein and communicates with the fluid passage section 40 in which the water wheel 42 is disposed through a gap formed by the gear mechanism 46, for example, a gear shaft through hole gap, This fluid chamber 52
The interior is filled with tap water at a predetermined water pressure. As an alternative, the flow meter 12 may be constructed so that tap water is introduced into the fluid chamber 52 by appropriately forming small holes in each component.

On the other hand, the valve casing 50 includes a water passage 54 that communicates with the fluid chamber 52 and the control water supply port 16, and a drain port 1 through the water passage 54 and the needle valve 56.
A drainage channel 58 communicating with 8 is provided respectively. The needle valve 56 always keeps the drain port 18 closed by a spring 60, and a step 62 for opening and closing is provided in a part of the needle valve 56.
Therefore, a through hole 64 for operation is bored in the valve casing 50 so as to face the stepped portion 62 provided in the needle valve 56, and an operation for engaging one end portion with the stepped portion 62 within this through hole 64 is provided. The rod 66 is inserted and arranged. However, the other end of the operating rod 66 is made to protrude into the fluid chamber 52 and is connected to the fluid chamber 52 of the water passageway 54.
A ball valve 68 is disposed in the side opening, and a slide cam 70 for simultaneously operating or holding the operating rod 66 and the ball valve 68 is disposed in contact with the valve casing 50. That is, the slide cam 70 is slidably held by a cam guide 72 fixed to the valve casing 50, and an engagement hole 74 is bored at one end of the slide cam 70, and the eccentric cam 48 is engaged with the engagement hole 74. match. Also, slide cam 70
A water passage 54 is bored in the valve casing 50 in a part of the valve casing 50.
A hole 76 is provided corresponding to the opening of the ball valve 68, and a ball valve 68 is accommodated in the hole 76, and the ball valve 68 is held by a cam guide 72. In this case, a small hole 78 for water passage is bored in the cam guide 72 in correspondence with the ball valve 68. Further, the slide cam 70 is provided with a conical hole 80 corresponding to the opening of the operating hole 64 bored in the valve casing 50.
The operating rod 66 is inserted into the cam guide 72, and its tip is brought into contact with the cam guide 72. In addition, the operating rod 66
A sealing means 82 for sealing the through hole 64 is provided approximately in the middle portion. That is, the illustrated sealing means 82 is provided with a stepped portion 84 at the middle portion of the through hole 64, and in correspondence with this stepped portion 84, the operating rod 66
A ball 86 is inserted and fixed in the through hole 64, and this ball 86 is held between a pair of O-rings 88, 88, respectively, and this ball 86 is elastically pressed against the step 84 in the through hole 64 by a spring 90 and fixed. This is what I did. By configuring like this,
The operating rod 66 can swing freely and be detached while achieving a reliable seal, which is advantageous in manufacturing.

When the switching valve mechanism 14 is configured in this way,
Due to the eccentric movement of the eccentric cam 48 based on the operation of the flowmeter 12, the slide cam 70 is deviated from the neutral position shown in FIG. 2 in the left-right direction.
For example, when the slide cam 70 is deviated to the left, the ball valve 68 is deviated to the left by the slide cam 70, thereby releasing the seal by the ball valve 68 and connecting the liquid chamber 52 and the water passage 54. In communication, pressure water (tap water) in the fluid chamber 52 is introduced into the water passage 54 . At this time, since one end of the operating rod 66 swings to the right about the ball 86, the needle valve 56 maintains the drain passage 58 in a closed state. Next, when the slide cam 70 is displaced to the right, the ball valve 68 returns to the closed position with respect to the water passage 54, and one end of the operating rod 66 swings to the left. Therefore, one end of the operating rod 66 comes into contact with the stepped portion 62 of the needle valve 56 to move the needle valve 56 to the left, and the drain passage 58 is opened.

However, when the needle valve 56 holds the drainage channel 58 in a closed state, the pressure water introduced into the water passage 54 is passed from the control water supply port 16 through the control water supply pipe 36 to the water supply valve 28 and the drainage water, which will be described later. Valve 3
The water is supplied to the diaphragm operation pressure chambers 94 and 108 of No. 0, and the water supply valve 28 is closed and the drain valve 30 is opened. Further, when the needle valve 56 opens the drain channel 58, the supply of control water to the water supply valve 28 and the drain valve 30 via the control water supply pipe 36 is cut off, and the water supply valve 28 is opened and the drain valve 30 is opened. 30 is closed. As a result,
By alternately opening and closing the water supply valve 28 and the drain valve 30, the drive water supply pipe 32 is connected to the conduit 9.
Pressure water from the water supply system 10 is introduced into a diaphragm drive pressure chamber 118 of a diaphragm drive metering pump 20 (to be described later) via a pipe 8 to perform a pump discharge operation, and then the pressure water supplied to the diaphragm drive pressure chamber 118 is introduced into a conduit 110. Drive water drain pipe 3 through
4 and is discharged to the outside and performs a pump suction operation.
By accomplishing these series of operations, one stroke of pumping operation is performed in the metering pump 20.

FIG. 3 shows an embodiment of the water supply valve 28 and drain valve 30 used in the device of the present invention. That is, in this embodiment, the water supply valve 28 includes a diaphragm 92 that performs a valve action, and a diaphragm operating pressure chamber 94 is formed on one side of the diaphragm 92, and a driving water introduction chamber 96 is formed on the other side. . Further, a control water supply pipe 36 led out from the switching valve mechanism 14 is connected to the diaphragm operating pressure chamber 94.
On the other hand, a driving water supply pipe 32 is connected to the driving water introduction chamber 96, and a conduit 98 that communicates with a diaphragm driving pressure chamber 118 of a metering pump 20, which will be described later, is inserted and arranged opposite to the diaphragm 92. . Therefore, when pressurized water is supplied to the control water supply pipe 36, the pressure within the diaphragm operating pressure chamber 94 increases, causing the diaphragm 92 to deviate toward the driving water introduction chamber 96, thereby closing the opening of the conduit 98. It is occluded and the valve closes.

In contrast, the drain valve 30 has one end engaged with the diaphragm 100 and the other end engaged with the coil spring 100.
2, the valve mechanism 104 is elastically held by
A diaphragm operating pressure chamber 108 is formed on the side of the diaphragm 100 opposite to the driving water outlet chamber 106 in which the valve mechanism 104 is provided. Further, a conduit 110 that communicates with a diaphragm drive pressure chamber of a metering pump 20 (described later) is inserted through the driving water outlet chamber 106 on one side through a valve mechanism 104, and a driving water drain pipe 34 is connected to the other side. . Note that the drive water drain pipe 34 is appropriately provided with an air vent valve 112. Therefore, if pressure water is supplied to the control water supply pipe 36, the diaphragm operating pressure chamber 10
8 increases, the diaphragm 100 is deviated toward the driving water outlet chamber 106, and the valve mechanism 104 is opened.

In this way, according to the water supply valve 28 and the drain valve 30 of this embodiment, when pressure water is supplied to the control water supply pipe 36, the pressure water in the diaphragm drive pressure chamber of the metering pump 20 is discharged, and the metering pump When the supply of pressure water to the control water supply pipe 36 is stopped, pressure water is supplied into the diaphragm drive pressure chamber 118 of the metering pump 20, and the metering pump discharges the chemical solution. Achieve.

FIG. 4 shows an embodiment of a diaphragm-driven metering pump 20 used in the device of the present invention. That is, the metering pump 20 in this embodiment
is equipped with a pump driving diaphragm 114 and a pump operating diaphragm 116, the pump driving diaphragm 114 has a diaphragm driving pressure chamber 118 formed on one side thereof, and one side of the pump operating diaphragm 116 formed on the other side thereof. It is equipped with an operating rod 120 that is directly connected to. on the other hand,
The other side of the pump operating diaphragm 116 has a pump chamber 122 similar to a normal diaphragm pump.
A fluid suction port 124 and a fluid discharge port 126 that communicate with the pump chamber 122 are provided with check valves 128 and 130, respectively. In addition,
A flange portion 132 is appropriately provided on a part of the operating rod 120 that connects the pump drive diaphragm 114 and the pump operation diaphragm 116, and a stopper 134 is provided with one side of the flange portion 132 formed as a part inside the pump casing. A spring member 136 is interposed between the flange portion 132 and the stopper 134 to assist the return force of the pump driving diaphragm 114. .

Therefore, the metering pump 20 configured in this way
is to provide an inlet passage 138 for introducing the pressure water supplied through the water supply valve 28 into the diaphragm driving pressure chamber 118, and an outlet passage 140 for discharging the pressure water through the drain valve 30. Therefore, in conjunction with the operation of the switching valve mechanism 14, a pump operation similar to that of a general metering pump can be achieved without a power source. Therefore, this metering pump 20 has its suction port 124 as shown in FIG.
is communicated with a predetermined chemical liquid storage tank 26, and the discharge port 1
By communicating 26 with the water system 10, a predetermined amount of chemical solution proportional to the flow rate of tap water can be easily pumped into the water system 10. In addition, in the metering pump 20 in this embodiment, the area ratio S1/S of the area S1 of the pump driving diaphragm 114 and the area S2 of the pump operating diaphragm 116 is
By selecting an appropriate multiple value for 2, it is possible to make the pump discharge pressure of the chemical solution or the like an appropriate number of times higher than the pressure of the tap water introduced into the pressure chamber 118. Furthermore, in the metering pump 20 of this embodiment, a threaded shaft 142 for stroke length adjustment is provided in a part of the pump casing forming the pressure chamber 118, facing the pump driving diaphragm 114, so that the threaded shaft 142 can be adjusted. It becomes possible to adjust the pump discharge amount from 0 to 100% by manual operation as appropriate.

As is clear from the embodiments described above, the device of the present invention periodically detects the flow rate of tap water with the flow meter 12, directly operates the switching valve mechanism 14 by the output shaft of the flow meter, and controls a portion of the tap water. Since the drive control of the metering pump 20 is carried out using the flow rate, it is possible to achieve smooth injection of the chemical liquid in exactly proportion to the flow rate of the tap water, completely without a power source.

Therefore, for example, the device of the present invention can be installed in a water distribution system 146 of an elevated water storage tank 144 as shown in FIG. It can be installed in a water supply system 150 derived from a water storage tank 148 installed in a mountainous area (see FIG. 5b), or in any other suitable water distribution system 1.
46 can be installed at any desired location (see Fig. 5c), and its applications are extremely wide-ranging.

[Effect of idea]

In particular, the device of the present invention uses an existing rotary flowmeter, integrally combines a simple switching valve mechanism with the flowmeter, and provides a simple water supply valve and drain valve to operate a metering pump. The drive can be operated properly and reliably with sufficient pressure water. Therefore, the device of the present invention is easy to manufacture and can realize flow rate proportional quantitative injection control of various chemical solutions ranging from large flow rates to small flow rates with high accuracy and at low cost. Furthermore, since a large amount of drug solution can be injected, highly concentrated injections can be made. Furthermore, since it operates without a power supply,
There is no trouble with maintenance, etc., and the effect of contributing to labor saving and energy saving of various water supply equipment is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the flow rate proportional metering injection control device according to the present invention, and Fig. 2 is a sectional view showing an embodiment of a rotary flowmeter equipped with a switching valve mechanism used in the device of the present invention. , FIG. 3 is a cross-sectional explanatory diagram of main parts showing an embodiment of the water supply valve and drain valve used in the device of the present invention, FIG. 4 is a sectional view showing an embodiment of the metering pump used in the device of the present invention, and FIG. 5 A to C are system diagrams showing application examples of the device of the present invention, respectively. 10... Water system, 12... Flow meter, 14... Switching valve mechanism, 16... Control water supply port, 18... Drain port, 20... Metering pump, 22... Discharge pipe, 24
... Suction pipe, 26 ... Chemical solution storage tank, 28 ... Water supply valve, 30 ... Drain valve, 32 ... Drive water supply pipe, 3
4... Drive water drain pipe, 36... Control water supply pipe, 3
8... External water distribution system, 40... Fluid passage section, 42...
...Waterwheel, 44...Shaft, 46...Gear mechanism, 46a
... Gear shaft, 48 ... Eccentric cam, 50 ... Valve casing, 52 ... Fluid chamber, 54 ... Water passage, 56
... Needle valve, 58 ... Drainage channel, 60 ... Spring, 62 ... Step, 64 ... Through hole, 66 ...
Operating rod, 68...Ball valve, 70...Slide cam, 72...Cam guide, 74...Engagement hole, 76
... Hole part, 78 ... Small hole, 80 ... Conical hole, 82
... sealing means, 84 ... step, 86 ... ball, 88 ... O-ring, 90 ... spring,
92...Diaphragm, 94...Diaphragm operating pressure chamber, 96...Driving water introduction chamber, 98...Conduit, 100...Diaphragm, 102...Coil spring, 104...Valve mechanism, 106...Driving water outlet chamber , 108... diaphragm operating pressure chamber, 110
... Conduit, 112 ... Air vent valve, 114 ... Diaphragm for pump drive, 116 ... Diaphragm for pump operation, 118 ... Pressure chamber, 120 ...
Operating rod, 122... Pump chamber, 124... Fluid suction port, 126... Fluid discharge port, 128, 130...
... Check valve, 132 ... Flange portion, 134 ... Stopper, 136 ... Spring member, 138 ... Inlet path, 140 ... Outlet path, 142 ... Screw shaft, 14
4...Elevated water tank, 146...Water distribution system, 146...
...Water tank, 150...Water system, 152...Water distribution system.

Claims (1)

[Claims for Utility Model Registration] (1) A fluid passage portion 40, a water wheel 42 rotatably disposed within this fluid passage portion, and a support shaft 4 of this water wheel.
4 and a gear shaft 46 of the gear mechanism, which rotates at a predetermined period in proportion to the flow rate of the fluid transferred within the fluid passage.
A rotary flowmeter 12 detects the flow rate of the main flow system with output shaft a, and is connected to the rotary flowmeter 12 via a fluid chamber 52 that introduces fluid of the main flow system to the control water supply port 16 and drainage. The valve casing 50 includes a valve casing 50 having an opening 18 and a fluid passageway 54 and a drainage passage 58 bored therein, and the drainage passage 58 is provided with a needle valve 56 that keeps the drainage opening 18 closed at all times. A slide cam 70 is provided in the chamber 52 to open and close the water passage 54 and the needle valve 56 at the same time, and this slide cam 70 is connected to an eccentric cam 48 that is pivoted to the output shaft 46a of the rotary flowmeter 12. A switching valve mechanism 14 configured to engage with each other so as to move forward and backward in a certain direction, and a pair of chambers 94, 96 and 108, 1 defined by diaphragms 92 and 100, respectively.
06, each one of the chambers 94 and 108
are connected to the control water supply pipes 32 led out from the control water supply port 16 of the switching valve mechanism 14, and a part of the fluid of the main flow system is introduced into the other chambers 96 and 106, and the switching valve mechanism 14
A water supply valve 28 and a drain valve 30 configured to open and close the valves by deflecting the diaphragm by the operation of A driving pressure chamber 118 defined by a pump driving diaphragm 114 communicating with the pump through a pump driving diaphragm 114,
A pump operating rod 120 is attached to the diaphragm 114.
The metering pump 20 is configured to perform a pump operation by attaching a diaphragm 116 for pump operation, and thereby perform a pump operation by deflecting a diaphragm 116 for pump operation. A flow rate proportional metered injection control device, characterized in that it is configured to perform a pump operation. (2) Opening and closing of the water passage 54 in the switching valve mechanism 14 is performed by a ball valve 68 that is linked to a slide cam 70.
A flow rate proportional metered injection control device according to claim 1 of the utility model registration claim, which is configured to perform the following steps. (3) A utility model in which opening and closing of the needle valve 56 provided in the drainage channel 58 in the switching valve mechanism 14 is performed by an operating rod 66 that is interlocked with a slide cam 70 and inserted into the valve casing 50 in a fluid-tight manner. A flow rate proportional metering injection control device according to claim 1. (4) The water supply valve 28 has a diaphragm operating pressure chamber 94 defined by a diaphragm 92 and a fluid introduction chamber 96.
A control water supply pipe 32 led out from the control water supply port 16 of the switching valve mechanism 14 is connected to the pressure chamber 94 in communication, and the displacement of the diaphragm 92 causes the fluid introduction chamber 96 and the metering pump 20 to be connected to each other.
The flow rate proportional metered injection control device according to claim 1, which is configured to open and close the driving pressure chamber 118 at the same time. (5) The drain valve 30 includes a diaphragm operating pressure chamber 108 defined by the diaphragm 100 and the valve mechanism 10.
4, and a control water supply port 1 of the switching valve mechanism 14 in the pressure chamber 108.
A control water supply pipe 32 led out from 6 is connected in communication, and the fluid outlet chamber 106 and the drive pressure chamber 118 of the metering pump 20 are opened and closed via the valve mechanism 104 by deflection of the diaphragm 100. A flow rate proportional metered injection control device according to claim 1 of the utility model registration claim. (6) The water supply valve 28 and the drain valve 30 are configured to open and close alternately by simultaneously supplying or stopping the control water derived from the control water supply port 16 of the switching valve mechanism 14, The flow rate proportional metered injection control device according to claim 1, which achieves pump operation by directly introducing and discharging fluid in the main flow system into the driving pressure chamber 118.