JPH04266671A - Liquid quantity regulating valve - Google Patents

Abstract

PURPOSE:To automize the fine control in a liquid quantity regulating valve to pH regulating agent by inserting a regulating shaft into a liquid quantity regulating pipe having first and second flow pipes in such a manner as to be capable of spirally advancing, fixing a gear to the other end, rotating the regulating shaft by solenoid drive, and advancing and retreating the regulating shaft in the regulating pipe. CONSTITUTION:A current is supplied to a first solenoid 13a to raise a first driving shaft 15b together with a plunger 14a. Then, a first hook body 18a is engaged with an engaging tooth 11 to rotate a gear body 12 clockwise by one pitch portion. Thus, a liquid quantity regulating shaft 8 integrated with the gear body 12 is rotated. The quantity regulating shaft 8 is advanced by the screw action, and the top end of a regulating part 10 is inserted into an inlet pipe 7 to reduce the inflow liquid quantity. When a second solenoid 13b is operated, the shaft is reversely operated to increase the flow rate.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid volume control valve that is installed in a pipe through which a liquid flows to adjust the flow rate of a liquid flow within the pipe. The present invention relates to a liquid volume control valve that can accurately perform fine adjustment by automatic control.

0002

[Prior Art] When introducing liquid chemicals into a liquid flow flowing in a pipe, it is common to use a metering pump to transfer the chemicals from a chemical tank into the pipe. The adjustment is performed by adjusting the discharge amount of the metering pump.

0003

[Problems to be Solved by the Invention] However, when alkali or acid is added as a pH adjuster to various solutions flowing inside a pipe and the pH of the liquid flow is adjusted within the pipe, it is necessary to add the pH adjuster using a metering pump. In addition to introducing the pH adjuster into the pipe using
A H electrode is installed, and a control device is used to automatically adjust the discharge amount of the metering pump according to the pH value measured by the pH electrode.
One possible method is to adjust the pH of the solution flowing through the pipe to the desired pH, but it is difficult to fine-tune the amount added using a metering pump.For example, when performing neutralization or adjusting to a very narrow pH range, , by changing the discharge amount of the metering pump
It is practically impossible to adjust the amount of the H adjuster added and thereby adjust the pH.

The present invention has been made in view of the above circumstances, and is provided with a distribution pipe for injecting chemicals such as a pH adjuster into the liquid flow flowing inside the pipe, and is a method for distributing the liquid flowing inside the pipe. It is an object of the present invention to provide a liquid volume control valve that can accurately and finely adjust the volume by automatic control.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a liquid volume adjustment pipe having a female threaded portion formed on the inner circumferential surface of the proximal end, and a longitudinally intermediate portion of the liquid volume adjustment pipe. a first distribution pipe branched into the liquid volume adjustment pipe; a second distribution pipe connected to the distal end of the liquid volume adjustment pipe; and a male threaded portion formed on the outer peripheral surface of the base end side, By screwing the threaded parts together, the distal end side is inserted into the hollow part of the adjustment pipe, and by rotating it forward and backward, the amount of liquid that the distal end side advances and retreats within the hollow part of the liquid volume adjustment pipe. an adjustment shaft, a disc-shaped gear body fixed concentrically to the base end of the liquid volume adjustment shaft, and first and second solenoids arranged and fixed above both sides of the gear body, respectively, with plungers facing downward. , the upper ends of which are connected to the plungers of these solenoids, and the first and second drive shafts are arranged along the vertical direction on both sides of the gear body, respectively, and the distal ends are respectively connected to the lower inner side of the drive shafts. a first rotatably mounted on the top, and whose tips engage with engagement teeth formed on the outer circumferential surface of the gear body at the inner rotation limit position when the drive shaft moves upward; and a second hook body.

[0006] In this case, if the tip side of the liquid volume adjustment shaft is formed into a tapered shape that gradually becomes smaller in diameter, and the adjustment shaft is rotated in the forward direction to move the tip side forward in the liquid adjustment pipe, the At the advanced limit position, the tip of the tapered tip is inserted into the second flow pipe, closing the communication port between the flow pipe and the liquid volume adjustment pipe, and the adjustment shaft is rotated in the opposite direction to close the tapered end. It is preferable that a gap is formed between the communication port and the tapered tip by retracting the tip, and that this gap gradually becomes larger.

[0007]

[Operation] The liquid volume control valve of the present invention is installed in a state in which a first distribution pipe, a liquid volume adjustment pipe, and a second distribution pipe are interposed in a pipe through which liquid flows, and a current is applied to the first or second solenoid. By supplying the fluid, the flow rate of the liquid flowing through the pipe is adjusted.

That is, the liquid volume control valve of the present invention allows the liquid volume to be adjusted when the liquid flow is introduced into the liquid volume control pipe from either the first or second distribution pipe and the liquid flow is discharged from the other distribution pipe. By rotating the adjustment shaft forward and backward, and moving the tip side of the adjustment shaft forward and backward within the hollow part of the adjustment pipe through the screw action between the male threaded part of the adjustment shaft and the female threaded part of the adjustment pipe, the flow from one of the flow pipes is The liquid flow path leading to the other distribution pipe via the liquid volume adjustment pipe is widened or narrowed to increase or decrease the amount of liquid flowing through this liquid volume adjustment pipe.In this case, one of the first or second solenoid A current is supplied to move the drive shaft upward together with the plunger, and the hook body attached to the drive shaft engages with the engagement teeth of the gear body to rotate the gear body by one pitch in one direction. By moving the gear body, the liquid amount adjusting shaft is rotated integrally with the gear body to move it forward, and by supplying current to the other solenoid, the other drive shaft is moved upward, and the drive shaft is moved forward. The gear body is then rotated in the opposite direction by one pitch of the engagement tooth by the hook body attached to the gear body, and together with this, the liquid volume adjustment shaft is rotated in the opposite direction so that the engagement is only one pitch. This is a setback.

Therefore, according to the liquid volume control valve of the present invention, the liquid volume adjustment shaft can be advanced or retreated by one pitch of the engagement teeth formed on the gear body, and therefore the liquid volume adjustment shaft in the liquid volume adjustment pipe can be moved back and forth very slightly. In addition to being able to adjust the opening degree of the liquid flow path, by changing the number of engaging teeth provided on the gear body, it is possible to change the amount of adjustment per pitch, allowing for fine adjustment of the liquid flow rate. can be done accurately. Further, by configuring the first and second solenoids to supply pulsed currents using an appropriate control device, this fine adjustment of the flow rate can be easily and automatically controlled.

Further, in this case, when the distal end side of the liquid volume adjustment shaft is formed into a tapered shape whose diameter gradually becomes smaller, and when this adjustment shaft is rotated and the distal end side is advanced within the liquid volume adjustment pipe, its advancement At the limit position, the tip of the tapered tip is inserted into the second distribution pipe, closing the communication port between the distribution pipe and the liquid volume adjustment pipe, and the adjustment shaft is rotated in the opposite direction to remove the tapered tip. By retracting the part, a gap is formed between the communication port and the tapered tip part, and by configuring this gap to gradually increase, more delicate adjustment is possible, and moreover, it is possible to make more delicate adjustments. The liquid flow also becomes smoother.

[0011]

Embodiment Next, a liquid volume control valve according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, reference numeral 1 denotes a base body having an L-shaped cross section, and a circular fitting hole 3 is formed in the center of the back plate 2 of this base body 1. A liquid volume adjusting pipe 4 having a female threaded portion (not shown) formed on its circumferential surface is attached by fitting and fixing a ring-shaped collar portion 5 formed at its base end. The liquid volume adjustment pipe 4 has an outlet pipe (first distribution pipe) 6 branched orthogonally protruding from an intermediate position of the hollow part, and an inlet pipe (first distribution pipe) 6 at the tip thereof. 2 circulation pipe) 7 is provided protrudingly.

Reference numeral 8 in the figure indicates a liquid volume adjustment shaft, and this adjustment shaft 8 has a flange-like fixing portion 9 formed at its base end, and a male threaded portion (not shown) formed at its outer peripheral surface on the base end side. and a tapered liquid volume adjustment part 10 that gradually becomes smaller in diameter on the tip side.
is formed. By screwing the male threaded portion of the adjustment shaft 8 into the female threaded portion of the liquid volume adjustment pipe 4, the tip of the liquid volume adjustment portion 10 passes through the hollow portion of the adjustment pipe 4 and connects with the inlet pipe 7. It is inserted into the communication port, and when the adjusting shaft is rotated clockwise by the screw action of both threaded parts, the adjusting section 10 moves forward inside the adjusting pipe 4, and when it is rotated counterclockwise, the adjusting shaft 10 moves forward within the adjusting pipe 4. It's starting to move backwards. Furthermore, a disc-shaped gear body 12 having a large number of engagement teeth 11 formed on its outer circumference is concentrically fixed to the fixing portion 9 of the adjustment shaft 8 .

Next, 13a and 13b in the figure are the first
The plungers 14a and 14b of these solenoids 13a and 13b respectively support the upper ends of a first drive shaft 15a and a second drive shaft 15b. The lower end surfaces of the two drive shafts 15a, 15b are cut out, and the cutout protrusions 16a, 16b are inserted into insertion holes (not shown) formed in the bottom plate 17 of the base body 1. 2
The drive shafts 15a, 15b move up and down together with the plungers 14a, 14b of the first and second solenoids 13a, 13b, respectively. Inside the lower parts of these first and second drive shafts 15a and 15b, a first hook body 18a and a second hook body 18b each having a U-shaped cross section are rotatable by pins 19 and 19 with their tips facing upward. The first and second solenoids 13a, 1
3b, when the first and second drive shafts 15a, 15b are pulled up, the hook bodies 18a, 18b are at their inner rotation limit positions (on the gear body 12 side), and the tips of the hook bodies 18a, 18b are connected to the engagement teeth of the gear body 12. 11, rotates the gear body 12 by one pitch, and when the drive shafts 15a, 15b descend, the hook bodies 18a, 18b rotate outward around the pins 19, 19, and engage with the engagement teeth 11. It is designed not to engage. In the figure, reference numerals 20 and 20 are mounting members that fix the first and second solenoids 13a and 13b to the back plate 2, respectively, and 21 and 21 are mounting members that connect the plungers 14a and 14b and the drive shafts 15a and 15b, respectively. This is a connecting fitting.

This liquid volume control valve is installed in a state in which an inlet pipe 7, a liquid volume control pipe 4, and an outlet pipe 6 are successively interposed in a pipe through which liquid flows, and the first and second solenoids 1
By supplying current to 3a and 13b, the liquid amount adjustment shaft 8
The liquid volume adjustment unit 10 is moved back and forth within the liquid volume adjustment pipe 4 to reduce or expand the liquid flow path consisting of the inlet pipe 7, the liquid volume adjustment pipe 4, and the outlet pipe 6, thereby reducing the amount of liquid flowing through the adjustment pipe 4. It adjusts the amount.

To explain this liquid volume adjustment operation in more detail, the liquid flow flowing through the liquid volume adjustment pipe 4 is transferred from the inlet pipe 7 to the adjustment portion of the adjustment shaft 8 at the communication port between the inlet pipe 7 and the adjustment pipe 4. 10 and the inner peripheral surface of the inlet pipe 7, flows into the regulating pipe 4, flows through the gap between the regulating section 10 in the regulating pipe, and is discharged from the outlet pipe. However, in this case, when reducing the flow rate flowing through the regulating pipe 4, by supplying current to the first solenoid 13a and moving the first drive shaft 15a upward together with the plunger 14a, the first hook 18 engages with the engagement tooth 11, and rotates the gear body 12 clockwise by one pitch. As a result, this gear body 1
2, the liquid volume adjustment shaft 8 rotates clockwise, and the liquid volume adjustment part 10 moves forward in the liquid volume adjustment pipe 4 by screw action, and the tip of the adjustment part 10 is connected to the communication port with the inlet pipe 7. The liquid enters into the inlet pipe 7 from the inlet pipe 7 and narrows the gap formed between the communication port and the outer circumferential surface of the tip end of the adjustment part 10, thereby reducing the amount of liquid flowing into the adjustment pipe 4 from the inlet pipe 7. By narrowing the liquid flow path within the regulating pipe 4, the amount of liquid flowing through the regulating pipe 4 is reduced. On the other hand, when increasing the amount of liquid flowing through the regulating pipe 4, the second solenoid 13b
The second drive shaft 15b is connected to the plunger 14b by supplying current to the second drive shaft 15b.
The gear body is rotated counterclockwise by the second hook body 18b, and the adjustment shaft 8 is rotated counterclockwise together with the gear body, thereby adjusting the adjustment portion 10 of the adjustment shaft 8. pipe 4
The liquid flow path in the adjustment pipe 4 is widened, and the gap between the communication port and the tip of the adjustment part 10 is widened to increase the amount of liquid flowing into the adjustment pipe 4. This increases the amount of liquid flowing through the pipe 4.

In this case, the rotational movement of the gear body 12 for advancing and retracting the adjustment shaft 8 is performed by the first or second solenoid 13a, 1
Each time a current is supplied to 3b, the engagement tooth 11 moves one pitch, but when turning or rotating the engagement tooth 11 by several pitches (when changing the flow rate significantly), the first or second
By continuously supplying a pulse current to the solenoids 13a, 13b and continuously moving the first or second drive shafts 15a, 15b up and down, the flow rate can be changed continuously.

Therefore, according to the liquid volume control valve of this embodiment, the liquid flow rate can be adjusted by one pitch of the engagement teeth, and delicate liquid volume adjustment can be performed accurately. Also,
By using an appropriate control device and configuring the pulse current to be supplied to the first and second solenoids, automatic control can be easily performed.

[Reference Example] Next, an example of a liquid volume adjustment system using the liquid volume adjustment valve of this embodiment will be explained with reference to the drawings. This shows a pH adjusting device that employs a system in which a liquid to be adjusted 31 stored in a storage tank 30 is introduced into an adjusting tube 33 from an inlet 33a at one end using the suction force of a pump 32, and a pH adjusting agent 34 is also introduced into the adjusting tube 33 through an inlet port 33a at one end. The adjustment agent is introduced into the middle part of the adjustment tube 33 from the adjustment agent injection tube 35 by the suction force of the pump 32, and both are spirally arranged in the length direction downstream from the connection position of the injection tube 35 of the adjustment tube 33. By passing through the provided stirring blade 36, the mixture is stirred and mixed to adjust the pH.
The water is collected from a discharge pipe 37 into a collection tank 38.

The adjusting agent injection pipe 35 is composed of an upper pipe 35a and a lower pipe 35b.
5a and 35b, the inlet pipe 7 (see FIG. 2) is connected to the lower end of the upper pipe 35a, and the outlet pipe 6 (see FIG. 2) is connected to the lower end of the lower pipe 35a.
It is interposed so as to be connected to the upper end of 5b. Also,
A portion of the adjustment tube 36 on the downstream side of the location where the stirring blade 36 is disposed is formed to have a large diameter, and a pH electrode 40 is installed in this large diameter portion 33b. Then, the liquid volume adjustment valve 3
9 first and second solenoids 13a, 13b (see Figure 2)
and pH electrode 40 are each connected to a control section 41.

This pH adjusting device controls the injection amount of the pH adjusting agent 34 using the liquid amount adjusting valve 39, the pH electrode 40, and the control section 41, and adjusts the pH of the liquid 31 to be adjusted to a desired pH. For example, when adjusting an acidic liquid to neutrality, the pump 32 sucks the acidic liquid 31 into the adjusting tube 33, and the alkali is added as a pH adjusting agent 34 into the adjusting tube 33 from the injection tube 35 via the liquid volume adjusting valve 39. The pH of the adjusted liquid is adjusted by stirring and mixing by passing through the stirring blade 36, and the pH of this adjusted liquid is measured with the pH electrode 40 at the large diameter portion 33b, and then collected from the discharge pipe 37 into the collection tank 38. However, in this case, the pH measured with a pH electrode
exceeds 7, the control unit 41 sends a pulse current to the first solenoid 13a of the liquid volume control valve 39 to reduce the flow rate of alkali through the valve 39 to reduce the amount of alkali injected. is less than 7, the control unit 41 controls the second solenoid 1 of the control valve 39.
A pulse current is transmitted to the valve 3b, and the amount of alkali flowing through the valve 39 is increased, thereby increasing the amount of alkali injected.

At this time, since the liquid volume control valve 39 has excellent fine adjustment ability, accurate pH adjustment can be performed reliably and continuously.

The liquid volume control valve of the present invention is not limited to the embodiment described above; for example, in the embodiment described above, the liquid volume adjustment portion 10 of the liquid volume adjustment shaft 8 is formed in a tapered shape. It is also possible to have a cylindrical shape with a uniform diameter, and to adjust the liquid flow rate in the adjustment pipe 4 by increasing or decreasing the opening degree of the communication port of the outlet pipe 6 with this adjustment shaft. Various changes may be made without departing from the gist of the present invention. Further, the liquid volume regulating system using the liquid volume regulating valve of the present invention is not limited to the above-mentioned reference example, and can be configured as appropriate depending on the usage thereof.

[0024]

As explained above, according to the liquid volume control valve of the present invention, by installing the valve in a pipe through which liquid flows, the flow rate of liquid flowing through the pipe can be accurately controlled by automatic control. can be finely adjusted.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a schematic diagram showing an example of a liquid volume adjustment system using the liquid volume adjustment valve of the present invention.

[Explanation of symbols]

4 Liquid volume adjustment pipe 6
Outlet pipe (first distribution pipe) 7 Inlet pipe (second distribution pipe)
Distribution pipe) 8 Liquid volume adjustment shaft 11 Engagement teeth 12 Gear body 13a First solenoid 13b
Second solenoside 14a, 14b plunger

Claims (1)

[Claims] 1. A liquid volume regulating pipe having a female threaded portion formed on the inner circumferential surface on the proximal end side, a first distribution pipe branchingly provided at a longitudinally intermediate portion of this liquid volume regulating pipe, A second flow pipe is connected to the distal end of the liquid volume adjusting pipe, and a male threaded portion is formed on the outer peripheral surface of the proximal end, and the distal end thereof can be adjusted by screwing the threaded portions of the two to the liquid volume regulating pipe. The liquid volume adjustment shaft is inserted into the hollow part of the pipe and rotates forward and backward so that the tip side advances and retreats inside the hollow part of the liquid volume adjustment pipe, and the base end of this liquid volume adjustment shaft is the same A disc-shaped gear body fixed at the center, first and second solenoids arranged and fixed above both sides of the gear body with plungers facing downward, and the upper ends of these solenoids are connected to the plungers, respectively. The first gears are arranged along the vertical direction on both sides of the gear body.
and a second drive shaft, each of which is rotatably attached to the lower inner side of each of these drive shafts with the tip end facing upward, and when the drive shaft moves upward, the tip of the drive shaft moves upward at the inner rotation limit position. A liquid volume regulating valve comprising first and second hook bodies that engage with engagement teeth formed on the outer peripheral surface of a gear body.