JPS6324481Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a quantitative injection control method for mixing other liquids (chemical solutions, etc.) into the main fluid transfer system at a predetermined flow rate in chemical plants, water and sewage facilities, food processing plants, etc. It is related to the device.

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. Various devices are known that are configured to operate in the same manner.

The applicant first combined a rotary flowmeter and a magnetic drive control type switching valve device, installed the rotary flowmeter in a predetermined fluid transfer system, and connected the flowmeter's pointer shaft, that is, the flow rate detection output shaft. The switching valve device is connected to the magnetic drive mechanism of the switching valve device, and the rotational movement of the flow rate detection output shaft is directly applied as the driving force of the magnetic drive mechanism, thereby eliminating the switching operation of the switching valve device based on the appropriate flow rate detection of the fluid transfer system. This is achieved using a power source, and in response to the switching operation of the switching valve device, a diaphragm-operated metering pump that utilizes the fluid pressure of the main fluid transfer system is driven, thereby pumping the chemical liquid, etc. to a desired location without a power source. We developed a flow rate proportional metered injection control device that could do this, and filed a patent application as Japanese Patent Application No. 37697/1983.

The device according to the invention has the excellent feature that it can be driven without a power source because the fluid pressure of the main fluid transfer system is applied to the pump driving pressure via the switching valve device. However, due to its structure, the switching valve device needs to be placed in close contact with the rotary flowmeter, and therefore, when installing the switching valve device, much consideration is required regarding installation space, strength, piping, etc., and the entire device The problem was that the installation work was troublesome.

In order to overcome the above-mentioned difficulties, the inventor conducted various studies and made prototypes, and as a result, succeeded in developing a fluid switching valve mechanism that can be built into a rotary flowmeter with a small size and simple structure. That is, an eccentric cam is attached to the pointer shaft of the flowmeter, and a valve casing with a built-in general needle valve mechanism is liquid-tightly connected to the flowmeter, and the eccentric cam is housed in this joint. forming a fluid chamber filled with fluid of a main fluid transfer system to which the valve is connected, and providing a water passage in the valve casing that communicates with the fluid chamber, the driving pressure chamber of the diaphragm-operated metering pump, and the drainage system, respectively; A slide cam that engages with the eccentric cam and moves forward and backward is provided, and the movement of the slide cam opens and closes a needle valve mechanism in the valve casing and opens and closes a water passage communicating with the fluid chamber. It has been found that by doing so, the metering pump can be operated, thereby making it possible to force-feed a predetermined chemical solution or the like to a desired location.

Therefore, an object of the present invention is to provide a flow rate proportional metered injection control device that has a simple structure and can always supply the required fluid under pressure at an appropriate flow ratio to the flow rate of the main fluid transfer system without a power source. There is something to do.

In order to achieve this purpose, in this invention,
The output shaft is a gear shaft of the gear mechanism that is connected to a support shaft of a water turbine disposed within the fluid passage through a gear mechanism and rotates at a predetermined period in proportion to the flow rate of the main fluid transferred within the fluid passage. It consists of a rotary flow meter, a control water supply port, a drainage port, and a valve casing with a fluid passageway and drainage channel drilled inside, and a needle valve is placed in the drainage channel to keep the drainage port closed at all times. A slide cam is provided in the fluid chamber to open and close the water passage and the needle valve at the same time, and this slide cam is engaged with an eccentric cam pivotally attached to the output shaft of the rotary flowmeter to move the flow meter in a fixed direction. A switching valve mechanism configured to move forward and backward, and a pump driving diaphragm are provided, a pressure chamber is formed on one side of the diaphragm, and a pump operating rod is attached to the other side, and the pressure is controlled under the action of the switching valve mechanism. It consists of a metering pump that introduces mainstream fluid into the room and performs pump operation by deflecting a diaphragm, and communicates the control water supply port of the switching valve mechanism with the pressure chamber of the metering pump, When the flow channel is communicated with the fluid chamber, the needle valve is kept closed to supply fluid to the pressure chamber of the metering pump, and when the flow channel and fluid chamber are then shut off, the needle valve is opened and the metering pump is closed. The pressure chamber is configured to drain fluid within the pressure chamber.

In the above-mentioned flow rate proportional metered injection control device, the opening and closing of the water passage in the switching valve mechanism can be configured to be performed by a ball valve interlocking with a slide cam. Further, the needle valve provided in the drainage channel may be opened and closed by an operating rod that is interlocked with a slide cam and inserted through the valve casing in a liquid-tight manner.

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 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, and is designated by reference numeral 10.
indicates a water system. 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. The control water supply port 16 and the drain port 18 are configured to introduce a portion of the pressure water of the system 10, respectively.
is provided. The control water supply port 16 communicates with a diaphragm drive pressure chamber of a diaphragm drive metering pump 22 via a control water flow path 20. In this way, the pressure water supplied under the action of the switching valve mechanism 14 drives the metering pump 22 and directs the chemical liquid in the predetermined chemical liquid storage tank 24 to the injection pipe 2.
6 into the water system 10. The drain port 18 communicates with an external drainage system as appropriate, and drains the pressure water that drives the metering pump 22 under the action of the switching valve mechanism 14. Therefore, in the present invention, the metering pump 2 is operated under the action of the switching valve mechanism 14.
The tap water transferred to the diaphragm drive pressure chamber 2 is then drained to an external drainage system or returned to the water system 10, during which one stroke pumping operation of the metering pump 22 is achieved.

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 flow path section 28 that guides and transfers tap water. A gear mechanism 34 is provided which interlocks with the shaft 32 of the water wheel 30. The gear mechanism 3
4 includes a water wheel 30 that rotates in proportion to the flow rate of the fluid.
There is a gear shaft 34a that rotates with a predetermined rotation period corresponding to the rotation speed of the gear shaft 34a. Note that a switching valve mechanism 14, which will be described later, is provided at the tip of the gear shaft 34a.
An eccentric cam 36 that operates the shaft is mounted on the shaft. The valve casing 38 is liquid-tightly connected to the main body of the flow meter 12 configured in this way, and the fluid chamber 40 is connected to this connected portion.
Set up a picture. Note that this fluid chamber 40 has the eccentric cam 36 located therein, and a flow chamber in which the water wheel 30 is disposed via a space formed by the gear mechanism 34, for example, between a gear shaft through hole. Road section 28
The inside of this fluid chamber 40 is filled with tap water having a predetermined water pressure. As an alternative, the flow meter 12
It is also possible to introduce tap water into the fluid chamber 40 by appropriately forming small holes in each of the constituent members.

On the other hand, the valve casing 38 has a water passage 42 that communicates with the fluid chamber 40 and the control water supply port 16, and a drain port 1 through the water passage 42 and the needle valve 44.
A drainage channel 46 communicating with each of the drains 8 and 8 is provided. The needle valve 44 keeps the drain port 18 closed at all times by a spring 48, and the needle valve 44
A stepped portion 50 for opening/closing operation is provided in a part of 4. Therefore, the valve casing 38 includes the needle valve 44.
An operating hole 52 is provided so as to face the stepped portion 50 provided in the
is bored into the through hole 52, and one end thereof is inserted into the stepped portion 5.
An operating rod 54 that engages with 0 is inserted and arranged. However, the other end of the operating rod 54 is made to protrude into the fluid chamber 40, and a ball valve 56 is disposed at the opening of the water passage 42 on the fluid chamber 40 side.
A slide cam 58 for simultaneously operating or holding the ball valve 56 and the valve casing 38
Place it in contact with the That is, the slide cam 5
8 is slidably held by a cam guide 60 fixed to the valve casing 38, and an engagement hole 62 is formed at one end thereof, and the eccentric cam 36 is engaged with the engagement hole 62. Further, a hole 64 is provided in a part of the slide cam 58 in correspondence with the opening of the water passage 42 bored in the valve casing 38.
A ball valve 56 is housed therein, and the ball valve 56 is held by a cam guide 60.
In this case, the gum guide 60 is provided with a small hole 66 for water passage in correspondence with the ball valve 56. Further, the slide cam 58 is provided with a conical hole 68 corresponding to the opening of the operating hole 52 formed in the valve casing 38, and the operating rod 54 is inserted into the conical hole 68 and the tip thereof is inserted. It is brought into contact with the cam guide 60. Note that the operating rod 54 is provided with a sealing means 70 for sealing the through hole 52 approximately in the middle portion thereof. That is, the illustrated sealing means 70 has a stepped portion 72 in the middle portion of the through hole 52, and a ball 74 is inserted and fixed into the operating rod 54 in correspondence with the stepped portion 72, and the ball 74 is inserted into each of the pair of O. - The ball 74 is held between rings 76, 76, and is fixed by elastically pressing the ball 74 against the step 72 in the through hole 52 by a spring 78. With this configuration, the operating rod 54 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 36 based on the operation of the flowmeter 12, the slide cam 58 is deviated from the neutral position shown in FIG. 2 in the left-right direction.
For example, when the slide cam 58 is deviated to the left, the ball valve 56 is deviated to the left by the slide cam 58, thereby releasing the seal by the ball valve 56 and connecting the fluid chamber 40 and the water passage 42. In communication, pressure water (tap water) in the fluid chamber 40 is introduced into the water passage 42 . At this time, one end of the operating rod 54 swings to the right around the ball 74, so that the needle valve 44 maintains the drain passage 46 in a closed state. Therefore, the pressure water introduced into the water passage 42 flows through the control water supply port 16 into the control water passage 2.
0 to a diaphragm-driven pressure chamber of a diaphragm-driven metering pump 22, which will be described later. Next, when the slide cam 58 is displaced to the right, the ball valve 56 returns to the closed position with respect to the water passage 42, and one end of the operating rod 54 swings to the left. Therefore, one end of the operating rod 54 abuts against the stepped portion 50 of the needle valve 44 and the needle valve 4
4 to the left side, and the drainage channel 46 is opened.
As a result, the pressure water supplied to the diaphragm drive pressure chamber of the metering pump 22 is transferred to the control water passage 2.
0, the water is drained to the outside from the drain port 18 via the water passage 42 and the drainage channel 46. By accomplishing the series of operations described above, one stroke of pumping operation is performed in the metering pump 22.

FIG. 3 shows an embodiment of a diaphragm-driven metering pump 22 used in the device of the present invention. That is, the metering pump 22 in this embodiment
is equipped with a pump driving diaphragm 80 and a pump operating diaphragm 82, and the pump driving diaphragm 80 forms a diaphragm driving pressure chamber 84 on one side thereof, and one side of the pump operating diaphragm 82 on the other side. It is equipped with an operating rod 86 that is directly connected to the section. On the other hand, the other side of the pump operating diaphragm 82 forms a pump chamber 88 like a normal diaphragm pump, and a fluid suction port 90 and a fluid discharge port 92 that communicate with this pump chamber 88 have check valves 94, respectively. , 96 are provided. Note that a flange portion 98 is appropriately provided on a part of the operating rod 86 that connects the pump driving diaphragm 80 and the pump operating diaphragm 82, and one side of this flange portion 98 is formed as a part of the inside of the pump casing. A spring member 102 is interposed between the flange portion 98 and the stopper 100 to assist the return force of the pump driving diaphragm 80. Configure.

Therefore, the metering pump 22 configured in this way
By providing a passage 104 for introducing pressure water controlled via the switching valve mechanism 14 into the diaphragm drive pressure chamber 84, the system can be operated without power supply and in conjunction with the operation of the switching valve mechanism 14. A pump operation similar to a metering pump can be achieved. Therefore, as shown in FIG.
By communicating the discharge port 92 with the water system 10, it is possible to easily pump and inject a predetermined amount of the chemical solution proportional to the flow rate of tap water into the water system 10. In addition, the metering pump 22 in this embodiment
In, the area of the pump driving diaphragm 80
By selecting an appropriate multiple of the area ratio S ₁ /S 2 between S ₁ and the area S ₂ of the pump operation diaphragm 82, the pump discharge pressure of the chemical solution _, etc., can be adjusted to the tap water introduced into the pressure chamber 84. It is possible to increase the pressure by an appropriate number of times. Furthermore, in the metering pump 22 in this embodiment, a pump driving diaphragm 8 is provided in a part of the pump casing forming the pressure chamber 84.
By providing the stroke length adjusting threaded shaft 106 facing 0, it becomes possible to adjust the pump discharge amount from 0 to 100% by manually operating the threaded shaft 106 as appropriate.

As is clear from the 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 with the output shaft of the flow meter, and controls a portion of the tap water. Since it is used to control the drive of the metering pump 22, it is possible to achieve smooth injection of the chemical liquid in exactly proportion to the flow rate of tap water, completely without power supply.

Therefore, for example, the device of the present invention can be installed in the water distribution system 110 of the elevated water storage tank 108 as shown in FIG. It can be installed in a water supply system 114 derived from a water storage tank 112 installed in a mountainous area (see Fig. 4b), or in any other suitable water distribution system 1.
16, it can be installed at any desired location (see Figure 4c), and its applications are extremely wide-ranging.

The device of this invention uses an existing rotary flowmeter,
Since this flow meter is integrally combined with a switching valve mechanism of a simple structure and a metering pump of a simple structure is provided, it has the advantage of being easy to manufacture and can be manufactured at extremely low cost. In addition, since the operation does not require a power supply and the accuracy of quantitative injection control can be sufficiently improved, there is no need for troublesome maintenance, and the effect of contributing to labor and energy saving of various water supply equipment is extremely large.

The preferred embodiments of the present invention have been described above, but for example, it is possible to make the pump capacity variable in the metering pump configuration, or to use a normal reciprocating pump as the pump operating part, and other aspects of the spirit of the present invention. Of course, various improvements and changes can be made within the scope of the invention.

[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 sectional view showing an embodiment of the metering pump used in the device of the present invention, and FIG. 4 a
-c are system diagrams respectively showing application examples of the device of the present invention. 10... Water system, 12... Flow meter, 14... Switching valve mechanism, 16... Control water supply port, 18... Drain port, 20... Control water passage, 22... Metering pump,
24... Chemical solution storage tank, 26... Injection pipe, 28... Channel section, 30... Water wheel, 32... Shaft, 34... Gear mechanism, 34a... Gear shaft, 36... Eccentric cam, 3
8...Valve casing, 40...Fluid chamber, 42...
Water flow channel, 44...needle valve, 46...drainage channel,
48...Spring, 50...Step part, 52...Through hole, 54...Operation rod, 56...Ball valve, 58...
...Slide cam, 60...Cam guide, 62...
Engagement hole, 64... hole, 66... small hole, 68...
Conical hole, 70... Sealing means, 72... Step portion, 7
4...Ball, 76...O-ring, 78...Spring, 80...Pump drive diaphragm,
82... Diaphragm for pump operation, 84... Pressure chamber, 86... Operating rod, 88... Pump chamber, 90
...Fluid suction port, 92...Fluid discharge port, 94,9
6... Check valve, 98... Flange portion, 100...
Stopper, 102... Spring member, 104... Passage, 106... Screw shaft, 108... Elevated water tank,
110...Water distribution system, 112...Water tank, 114...
...Water system, 116...Water distribution system.

Claims (1)

[Claims for Utility Model Registration] (1) Connected via a gear mechanism to a supporting shaft of a water wheel disposed within the fluid passage, and rotating at a predetermined period in proportion to the flow rate of the main fluid transferred within the fluid passage. It consists of a rotary flowmeter whose output shaft is the gear shaft of the gear mechanism, and a valve casing that has a control water supply port and a drainage port, and has a fluid passageway and a drainage channel inside. A needle valve that keeps the drain port closed at all times is provided, and a slide cam that simultaneously opens and closes the water passage and the needle valve is provided in the fluid chamber, and this slide cam is pivoted to the output shaft of the rotary flowmeter. A switching valve mechanism configured to move forward and backward in a fixed direction by engaging with an eccentric cam, and a pump driving diaphragm, with a pressure chamber formed on one side of the diaphragm and a pump operating rod attached to the other side. , a metering pump that introduces fluid in the main flow system into the pressure chamber under the action of the switching valve mechanism and performs pumping operation by deflecting a diaphragm, and the control water supply port of the switching valve mechanism and the metering pump are connected to each other. When the flow channel of the switching valve mechanism was communicated with the fluid chamber, the needle valve was kept closed to supply fluid to the pressure chamber of the metering pump, and then the flow channel and the fluid chamber were shut off. A flow rate proportional metering injection control device, characterized in that the needle valve is opened to drain the fluid in the pressure chamber of the metering pump when the metering pump is in use. (2) The flow rate proportional metered injection control device according to claim 1, wherein the opening and closing of the water passage in the switching valve mechanism is performed by a ball valve that is interlocked with a slide cam. (3) The opening and closing of the needle valve provided in the drainage channel in the switching valve mechanism is performed by an operating rod that is interlocked with a slide cam and inserted through the valve casing in a liquid-tight manner. Flow rate proportional metered injection control device.