JP2806061B2 - Fluid control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid flow control valve which is interposed in a pipe through which a liquid flows and controls the flow of a liquid flowing through the pipe. The present invention relates to a liquid amount control valve capable of accurately performing fine adjustment by automatic control.

[0002]

2. Description of the Related Art When a liquid medicine is introduced into a liquid flow flowing in a pipe, a method of transferring the medicine from a chemical tank into the pipe by using a metering pump is generally used. Is adjusted by adjusting the discharge amount of the metering pump.

[0003]

However, in the case where an alkali or an acid is added as a pH adjuster to various solutions flowing in the pipe and the pH of the liquid stream is adjusted in the pipe, a metering pump is used for the pH adjuster. And a pH electrode is installed downstream of the pH adjusting agent injection position of the pipe, and the discharge amount of the metering pump is automatically adjusted according to the pH value measured by the pH electrode using the control device. Then, it is conceivable to adjust the solution flowing in the pipe to the desired pH.However, it is difficult to finely adjust the addition amount with a metering pump.For example, when adjusting to a neutralization treatment or a very narrow pH range. In this case, it is practically impossible to adjust the amount of the pH adjuster by changing the discharge amount of the metering pump and thereby adjust the pH.

The present invention has been made in view of the above circumstances. Therefore, the present invention is interposed in a flow pipe for injecting a chemical such as a pH adjuster into a liquid flow flowing in a pipe or the like, and the flow of the liquid flowing in the pipe is provided. It is an object of the present invention to provide a liquid amount adjusting valve capable of accurately and finely adjusting the amount by automatic control.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a liquid amount adjusting pipe having a female thread formed on an inner peripheral surface on a base end side, and an intermediate portion in a longitudinal direction of the liquid amount adjusting pipe. A first flow pipe branched from the first flow pipe, a second flow pipe connected to the distal end of the liquid flow control pipe, and a male screw portion formed on the outer peripheral surface on the base end side. By screwing each other's screw portions, the tip side is attached in a state inserted into the hollow portion of the adjusting pipe, and by rotating forward and backward, the tip side advances and retreats in the hollow portion of the liquid amount adjusting pipe. An adjusting shaft, a disc-shaped gear body concentrically fixed to a base end of the liquid amount adjusting shaft, and first and second solenoids arranged and fixed with plungers downward on both sides of the gear body, respectively. The upper end of these solenoid plungers Are connected to each other, and first and second drive shafts are respectively disposed along both sides of the gear body in the up-down direction, and are rotatably mounted on the lower inner side of these drive shafts with their tip sides facing upward. A first and a second hook body each having a tip engaged with an engagement tooth formed on an outer peripheral surface of the gear body at an inner rotation limit position when the drive shaft moves upward. Provided is a liquid amount control valve characterized in that:

In this case, when the distal end of the liquid amount adjusting shaft is formed in a tapered shape with a gradually decreasing diameter, and the adjusting shaft is rotated forward to advance the distal end in the liquid adjusting pipe, At the forward limit position, the communication port between the flow pipe and the liquid amount adjustment pipe is closed while the tip of the tapered tip is inserted into the second flow pipe, and the adjustment shaft is rotated in the reverse direction to form the tapered shape. It is preferable that a gap is formed between the communication port and the tapered tip by retreating the tip, and the gap is gradually increased.

[0007]

The liquid flow control valve of the present invention is installed in a state in which a first flow pipe, a liquid flow control pipe and a second flow pipe are interposed in a pipe through which a liquid flows, and supplies a current to the first or second solenoid. By supplying the liquid, the flow rate of the liquid flowing through the pipe is adjusted.

That is, the liquid amount adjusting valve of the present invention is designed to introduce a liquid flow from one of the first and second flow pipes into the liquid flow control pipe and discharge the liquid flow from the other flow pipe. By rotating the adjusting shaft forward and backward, and by moving the distal end side of the adjusting shaft forward and backward in the hollow portion of the adjusting pipe by the screw action of the male screw portion of the adjusting shaft and the female screw portion of the adjusting pipe, one of the flow pipes The amount of liquid flowing through the liquid flow control pipe is increased or decreased by widening or narrowing the liquid flow path leading to the other flow pipe via the liquid flow control pipe. At this time, one of the first and second solenoids is used. And the drive shaft is moved up integrally with the plunger, and the hook body attached to the drive shaft is engaged with the engagement teeth of the gear body to rotate the gear body by one pitch in one direction. By moving, this gear body and By rotating the liquid amount adjusting shaft on the body and moving it forward, and supplying current to the other solenoid, the other drive shaft is moved up and the gear body is moved by the hook body attached to the drive shaft. Is rotated in the opposite direction by one pitch of the engaging teeth, and the liquid amount adjusting shaft is rotated in the opposite direction integrally therewith, and the engagement is retracted by one pitch.

Therefore, according to the liquid amount adjusting valve of the present invention, the liquid amount adjusting shaft can be moved forward and backward by one pitch of the engaging teeth formed on the gear body. The opening degree of the liquid flow passage can be adjusted, and the amount of adjustment for each pitch can be changed by changing the number of engagement teeth provided on the gear body,
Fine adjustment of the liquid flow rate can be performed accurately. Further, by using a suitable control device to supply a pulse current to the first and second solenoids, the fine adjustment of the flow amount can be easily and automatically controlled.

In this case, when the tip side of the liquid amount adjusting shaft is formed in a tapered shape having a gradually decreasing diameter, and when the adjusting shaft is rotated to advance the tip side in the liquid amount adjusting pipe, the advance In the limit position, the communication port between the flow pipe and the liquid amount adjustment pipe is closed while the tip of the tapered tip is inserted into the second communication pipe, and the adjustment shaft is rotated in the reverse direction so that the tapered tip is By retreating the portion, a gap is formed between the communication port and the tapered tip, and by configuring the gap to gradually increase, finer adjustment is possible, and moreover, the inside of the adjustment pipe Of the liquid becomes smoother.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a liquid amount adjusting valve according to an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a base having an L-shaped cross section. A circular fitting hole 3 is formed in the center of a back plate 2 of the base 1, and the fitting hole 3 has a base inner side. A liquid amount adjusting pipe 4 having a female screw portion (not shown) formed on its peripheral surface is attached by fitting and fixing a ring-shaped flange portion 5 formed at a base end thereof. An outlet pipe (first flow pipe) 6 is provided at an intermediate position of the hollow portion in the liquid amount adjusting pipe 4 so as to protrude in a state of branching in a straight line. 2 distribution pipe) 7 is protruded.

In the drawing, reference numeral 8 denotes a liquid amount adjusting shaft. The adjusting shaft 8 has a flange-shaped fixing portion 9 formed at a base end thereof and a male screw portion (not shown) formed at an outer peripheral surface on the base end side. And a taper-shaped liquid amount adjusting section 10 having a gradually decreasing diameter on the tip side.
Are formed. The adjusting shaft 8 has its male thread part screwed into the female thread part of the liquid amount adjusting pipe 4 so that the tip of the liquid amount adjusting part 10 passes through the hollow part of the adjusting pipe 4 and connects with the inlet pipe 7. When the adjustment shaft is rotated clockwise by the screw action of the two screw portions, the adjustment portion 10 advances in the adjustment pipe 4 and rotates counterclockwise. It is designed to retreat. Further, a disc-shaped gear body 12 having a large number of engaging teeth 11 formed on the outer periphery is concentrically fixed to the fixing portion 9 of the adjusting shaft 8.

Next, in the figure, 13a and 13b are the first
The upper ends of a first drive shaft 15a and a second drive shaft 15b in the shape of a square rod are supported by plungers 14a and 14b of the solenoids 13a and 13b, respectively. The lower end surfaces of the two drive shafts 15a and 15b are cut out, and the notch projections 16a and 16b are inserted into insertion holes (not shown) formed in the bottom plate 17 of the base 1, and the first and the second are formed. 2
The drive shafts 15a and 15b move up and down integrally with the plungers 14a and 14b of the first and second solenoids 13a and 13b, respectively. Inside the lower portions of the 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, 19 with their tip sides facing upward. The first and second solenoids 13a, 1
When the first and second drive shafts 15a and 15b are lifted by the drive shaft 3b, the tips of the hook members 18a and 18b are engaged with the engagement portions of the gear member 12 at the rotation limit positions thereof (toward the gear member 12). When the drive shafts 15a, 15b descend, the hook members 18a, 18b rotate outward about the pins 19, 19, and engage with the engagement teeth 11. It does not engage. In the drawings, reference numerals 20 and 20 denote mounting members for fixing the first and second solenoids 13a and 13b to the back plate 2, and 21 and 21 connect the plungers 14a and 14b and the drive shafts 15a and 15b, respectively. Connecting bracket.

The liquid amount adjusting valve is attached to a pipe through which a liquid flows, with an inlet pipe 7, a liquid amount adjusting pipe 4, and an outlet pipe 6 being interposed sequentially, and the first and second solenoids 1 are provided.
By supplying an electric current to 3a, 13b, the liquid amount adjusting shaft 8
The liquid flow control section 10 is advanced or retracted in the liquid flow control pipe 4 to reduce or expand the liquid flow path composed of the inlet pipe 7, the liquid flow control pipe 4 and the outlet pipe 6, and the liquid flowing through the control pipe 4 The amount is adjusted.

The operation of adjusting the liquid amount will be described in more detail. The liquid flowing through the liquid amount adjusting pipe 4 flows from the inlet pipe 7 to the adjusting portion of the adjusting shaft 8 at the communication port between the inlet pipe 7 and the adjusting pipe 4. It flows into the adjusting pipe 4 through a gap formed between the inner pipe 10 and the inner peripheral surface of the inlet pipe 7, flows through the gap between the adjusting pipe 10 in the adjusting pipe, and is discharged from the outlet pipe. However, in this case, when the flow rate flowing through the adjustment pipe 4 is to be reduced, the first hook body is moved up by moving the first drive shaft 15a integrally with the plunger 14a by supplying a current to the first solenoid 13a. 18 engages with the engaging teeth 11 to rotate the gear body 12 clockwise by one pitch. As a result, the liquid amount adjusting shaft 8 is rotated clockwise integrally with the gear body 12, and the liquid amount adjusting portion 10 moves forward in the liquid amount adjusting pipe 4 by a screw action, and the tip of the adjusting portion 10 enters the inlet. The gap formed between the communication port and the outer peripheral surface of the adjusting section 10 by entering the inlet pipe 7 from the communication port with the pipe 7 is reduced, and the amount of liquid flowing into the adjustment pipe 4 from the inlet pipe 7 is reduced. At the same time, the amount of liquid flowing through the adjustment pipe 4 is reduced by narrowing the liquid flow path in the adjustment pipe 4. On the other hand, when increasing the amount of liquid flowing through the adjusting pipe 4, the second solenoid 13
b to supply the second drive shaft 15 b with the plunger 14.
b, the gear body is rotated counterclockwise by the second hook body 18b, and the adjustment shaft 8 is rotated counterclockwise integrally with the second hook body 18b. It is retracted in the adjusting pipe 4 to increase the amount of liquid flowing into the adjusting pipe 4 by widening the gap between the communication port and the tip of the adjusting section 10 and to widen the liquid flow path in the adjusting pipe 4. Thus, the amount of liquid flowing through the adjustment pipe 4 is increased.

In this case, the turning movement of the gear body 12 for moving the adjusting shaft 8 forward and backward is performed by the first or second solenoids 13a, 13a.
Each time the current is supplied to 3b once, the pitch of the engaging teeth 11 is one pitch. However, when the engaging teeth 11 are rotated or rotated by several pitches (when the flow rate is largely changed), the first or second pitch is set.
By continuously supplying a pulse current to the solenoids 13a and 13b and moving the first or second drive shafts 15a and 15b up and down continuously, the flow rate can be changed continuously.

Therefore, according to the liquid amount control valve of the present embodiment, the liquid flow amount can be adjusted by one pitch of the engagement teeth, and fine liquid amount adjustment can be performed accurately. Also,
By using a suitable control device and supplying a pulse current to the first and second solenoids, automatic control can be easily performed.

[Reference Example] Next, an example of a liquid amount adjusting system using the liquid amount adjusting valve of the present embodiment will be described with reference to the drawings. FIG. This shows a pH adjusting device employing a system, in which a liquid to be adjusted 31 stored in a storage tank 30 is introduced into an adjusting pipe 33 by a suction force of a pump 32 from an inlet 33a on one end thereof, and a pH adjusting agent 34 is also introduced. The suction force of the pump 32 introduces the adjusting agent from the adjusting agent injection pipe 35 to the intermediate portion of the adjusting pipe 33, and the two are spirally formed along the length direction downstream from the connection position of the adjusting pipe 33 to the injection pipe 35. The mixture is stirred and mixed by passing through a provided stirring blade 36 to adjust the pH, and is collected from a discharge pipe 37 to a collection tank 38.

Here, the adjusting agent injection pipe 35 comprises an upper pipe 35a and a lower pipe 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 pipe 3 between the liquid amount adjusting valve 39 of the above embodiment between 5a and 35b.
It is interposed so as to be connected to the upper end of 5b. Also,
The adjusting tube 36 has a large diameter at a part of the downstream side of the position where the stirring blades 36 are provided, and the pH electrode 40 is installed in the large diameter portion 33b. Then, the liquid amount adjusting valve 3
Nineth first and second solenoids 13a and 13b (see FIG. 2)
The pH electrode 40 is connected to the control unit 41.

In this pH adjusting apparatus, the injection amount of the pH adjusting agent 34 is controlled by the liquid amount adjusting valve 39, the pH electrode 40 and the control section 41, and the adjusted liquid 31 is adjusted to a target pH. For example, when the acidic liquid is adjusted to be neutral, the acidic liquid 31 is sucked into the adjusting pipe 33 by the pump 32, and an alkali as a pH adjuster 34 is injected from the injection pipe 35 through the liquid quantity adjusting valve 39 into the adjusting pipe 33. The mixture is stirred and mixed by passing them through a stirring blade 36 to adjust the pH. The pH of the adjusted liquid is measured at the large-diameter portion 33b by the pH electrode 40, and then collected from the discharge pipe 37 to the collection tank 38. In this case, the pH measured with a pH electrode
Is greater than 7, a pulse current is transmitted from the control unit 41 to the first solenoid 13a of the liquid amount regulating valve 39, and the amount of alkali flowing through the valve 39 is reduced by decreasing the amount of alkali flowing therethrough. Is less than 7, the control unit 41 controls the second solenoid 1 of the adjustment valve 39.
A pulse current is transmitted to 3b, the amount of alkali flowing through the valve 39 increases, and the amount of injected alkali increases.

At this time, since the liquid amount adjusting valve 39 is excellent in the fine adjusting ability, accurate pH adjustment is surely and continuously performed.

The liquid amount adjusting valve of the present invention is not limited to the above embodiment. For example, in the above embodiment, the liquid amount adjusting portion 10 of the liquid amount adjusting shaft 8 is formed in a tapered shape. May be formed into a columnar shape having a uniform diameter, and the flow rate of the liquid in the adjusting pipe 4 may be adjusted by increasing or decreasing the opening of the communication port of the outlet pipe 6 with the adjusting shaft. May be variously changed without departing from the gist of the present invention. Further, the liquid amount adjusting system using the liquid amount adjusting valve of the present invention is not limited to the above-mentioned reference example at all, and can be appropriately configured according to its use and the like.

[0024]

As described above, according to the liquid amount control valve of the present invention, by interposing this valve in the pipe through which the liquid flows, the flow rate of the liquid flowing through the pipe can be accurately controlled by automatic control. Can be fine-tuned.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

 Reference Signs List 4 liquid amount adjusting pipe 6 outlet pipe (first flow pipe) 7 inlet pipe (second flow pipe) 8 liquid amount adjusting shaft 11 engaging tooth 12 gear body 13a first solenoid 13b second solenoid 14a, 14b plunger 15a first Drive shaft 15b Second drive shaft 18a First hook body 18b Second hook body

Claims (1)

(57) [Claims] 1. A liquid amount adjusting pipe having a female thread formed on a base end side inner peripheral surface, a first flow pipe branched and provided at an intermediate portion in a length direction of the liquid amount adjusting pipe, and The second flow pipe connected to the distal end of the volume control pipe and the external thread portion are formed on the outer peripheral surface on the base end side. The distal end side is adjusted by screwing each screw portion to the liquid volume control pipe. Attached in a state inserted into the hollow portion of the pipe, the tip side moves forward and backward by rotating in the forward and reverse directions, and a liquid amount adjusting shaft that moves back and forth in the hollow portion of the liquid amount adjusting pipe, and a base end portion of the liquid amount adjusting shaft. A disc-shaped gear body fixed by centering; first and second solenoids arranged and fixed with plungers facing downward on both sides of the gear body, and upper ends thereof connected to plungers of these solenoids, respectively; On each side of the gear body First and second drive shafts arranged along the vertical direction, and are rotatably mounted on the lower inner side of these drive shafts with their tip sides facing up, respectively, when the drive shafts move upward, A liquid amount control valve, comprising: first and second hook bodies each of which has a tip engaged with an engagement tooth formed on an outer peripheral surface of the gear body at an inner rotation limit position.