JPH0737703Y2 - Dispersion mixer - Google Patents

Description

The present invention relates to a dispersive mixer, and more particularly to a dispersive mixer having a control means for automatically opening and closing a nozzle opening of its header via a valve means. .

(Prior Art and Problem to be Solved) Conventionally, a header for injecting an injecting fluid into the conduit through the main fluid passage conduit having a stirring element inside and a nozzle connected to the conduit And a dispersion mixer having a pumping means for pumping an injection fluid to the header.

In the above configuration, since the main fluid passage conduit and the header communicate with each other through the nozzle, the main fluid in the conduit flows back into the header through the nozzle at the start and end of injection. This backflow fluid remains in the header and causes problems such as charring.

In order to solve the above problems, a method and an apparatus for opening and closing a valve provided in a nozzle at the start and end of injection have been proposed and disclosed by the applicant of the present application (Japanese Patent Laid-Open No. 60-187325).

However, although the above problems are eliminated by the method and apparatus, the apparatus does not include a control means for automatically controlling the opening and closing of the nozzle by responding the valve operation to the pressure in the header.

Therefore, an object of the present invention is to provide a dispersion mixer which is a further development of the invention disclosed in the conventional application.

DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention The dispersion mixer of the present invention comprises a main fluid passage conduit having a stirring element therein and a nozzle connected to the conduit, and an injection fluid is injected into the conduit through the nozzle. And a header for injecting an injection fluid into the header, valve means for opening and closing the nozzle opening of the header, and control means for controlling the operation of the valve means according to the pressure in the header. .

The control means preferably includes control means for controlling the operation of the valve means in conjunction with the operation of the pressure feeding means.

Further, the control means may include control means for outputting a signal for operating the valve means when the output of the pressure detection means for detecting the pressure in the header is equal to or higher than a predetermined pressure.

Further, the control means may include a control means for controlling the operation of the valve means according to the output of the differential pressure detection means for detecting the differential pressure between the pressure in the header and the pressure in the conduit.

Further, it is preferable that the valve means includes a normally closed valve that closes the nozzle opening in the non-operating state.

In order to prevent the main fluid in the conduit from flowing back to the header, the present invention comprises control means for opening and closing the valve means for opening and closing the nozzle according to the pressure in the header.

This control means basically controls the valve means as follows.

When the header pressure P ₁ is higher than the conduit pressure P ₂ (P ₁ >
P ₂ ), the nozzle is opened and the header pressure P ₁ is equal to the conduit pressure P ₂
When Is it time small than equal (P ₁ ≦ P _2), the nozzle is closed.

Then, when the nozzle is open, the injection fluid is supplied from the header into the conduit, and when the nozzle is closed, the reverse flow of the main fluid from the conduit into the header is blocked.

The control means can input the pressure difference between the both by the detection means and control the operation of the valve means according to the above conditions. Further, without detecting the conduit pressure P _2, the valve when it exceeds header pressure P ₁ is predetermined pressure, for example header pressure P ₁ when it becomes possible injection into the conduit 'a (> P ₂₎ The means can also be activated.

Further, the magnitude of the pressure in the header can be judged by the operation of the pressure feeding means as the pressure supply means. That is, when the pressure feeding means is stopped, the pressure in the header is small and the nozzle is closed in this state, and when the pressure feeding means is operating, the pressure in the header is high and the nozzle is opened at this time.
Therefore, the opening / closing operation of the valve means can be controlled in conjunction with the operation of the pressure feeding means.

The operation of the valve means may be interlocked with the operation switch of the pressure feeding means, or the tachometer of the pressure feeding means (the number of electric pulses proportional to the rotation speed output from the tachometer is an input signal), etc. May be linked to.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, a dispersive mixer 10 according to the present invention has a conduit 13 composed of an injection part 11 to which a plurality of injection nozzles 21 are connected and a static mixer part 12 following the injection part 11. Has a plurality of inlets 22 and is a conduit for the inlet 11.
A spiral element 14 is fitted inside 13.

The static mixer section 12 is known per se, and is formed, for example, by twisting blades 15 having a twist of about 180 degrees alternately fitted so that their ends are substantially orthogonal to each other and their twisting directions are reversed. (For example, those described in JP-B-44-8290 and JP-B-52-17264).

The spiral element 14 inside the injection part 11 is a plate twisted about the tube axis, has a twist angle of at least 360 degrees or more, and is usually 360 to 720 degrees. The practical upper limit is about 3600 degrees, but this is in accordance with the manufacturing design of the torsion plate and the practical design of the injection part, and is not necessarily limited to this upper limit twist angle.

The dispersive mixer 10 also includes a plurality of injection nozzles 21 extending to the injection section 11, a header 23 for injecting a fluid into the injection section 11 via the nozzles 21, and a header 23 provided for each injection nozzle 21. And an on-off valve 25 for opening and closing the opening of the nozzle.

The header 23 is an inverted T-shaped tube as shown in the figure,
The injection fluid introduction pipe 31 is connected to the connection port 26 and plugged at both ends.
27 is screwed on.

Two or more injection nozzles 21 are provided, and at least one nozzle port 22 is opened in each tube chamber defined by the spiral element 14 of the injection unit 11 of the dispersion mixer 10. The number and the arrangement of the actual injection nozzles 21 are selected according to the purpose, and the injection nozzles 21 are arranged at the circumferential and axial intervals of the tube wall or at appropriate spiral rotation angle intervals.

The mounting angle of the injection nozzle 21 with respect to the conduit 13 is preferably inclined by a predetermined angle with respect to the axis in the direction A of the flow of the main fluid in the axial cross section, as illustrated in FIG. The mounting angle of the injection nozzle 21 with respect to the conduit 13 in the cross section orthogonal to the axis is sufficient to be orthogonal to the pipe wall (for ease of mounting and effect), but it is predetermined with respect to the pipe wall tangent in the twisting direction of the spiral element 14. It can also be installed at an angle. The diameter and number of the injection nozzle 21 are determined according to the flow rate of the injection fluid to be mixed. Generally, it is preferable that the injection speed of the injection fluid is substantially higher than the flow rate of the main fluid. To be selected.

The on-off valve 25 provided corresponding to each injection nozzle 21 is
Located on the opposite side of the injection nozzle 21 with the header 23 as the center,
A valve pipe 28 centered on the injection nozzle 21, a rod-shaped valve body 29 having an outer diameter substantially the same as the inner diameter of the nozzle penetrating from the valve pipe 28 into the header 23 and penetrating into the injection nozzle 21; The drive mechanism 30 is provided at the outer end of the valve pipe 28 to move the valve body 29 in and out of the nozzle 21.

When this on-off valve is pneumatic, the drive mechanism is composed of an air cylinder, when it is hydraulic, it is composed of a hydraulic cylinder, and when it is electromagnetic, it is composed of a solenoid.

In this embodiment, the drive mechanism is composed of a single-acting air cylinder 30, and the air cylinder 30 moves the valve body 29 backward or forward by introducing and discharging air pressure. The air cylinder 30 closes the nozzle 21 when the tip of the valve element 29 penetrates into the nozzle 21, and opens the nozzle 21 when not in the nozzle 21 to inject fluid from the nozzle 21.
It is mixed with the main fluid. Since the valve pipe 28 and the injection nozzle 21 are centered, the repair and inspection of the nozzle 21 is facilitated by removing the valve pipe 28 and the air cylinder 30 from the nozzle 21 at the time of repair and inspection of the injection nozzle 21.

The dispersion mixer 10 is further connected to a header connection port via a pipe 31.
It has a pumping means connected to 26, that is, a pump 32, and a control means 40 for controlling the operation of the on-off valve 25 in conjunction with the operation of the pump 32.

The pump 32 pumps the injection fluid in the tank 47 into the header 23 via the pipe 31.

In addition, a solenoid valve 33 and a check valve 34 are arranged in the pipe 31, and the solenoid valve 33
33 connects and disconnects the pipe 31 in accordance with the operation of the pump, and the check valve 34 prevents the injected fluid from flowing back to the pump side.

The control means 40 inputs an operation switch signal of the pump and outputs an on / off signal, and an on / off signal which is input, and is turned on or off based on these signals. Air cylinder 30 when turned on
A control circuit 42 that outputs a control signal that controls the operation of the engine and a valve device 43 that supplies and exhausts air pressure to and from the air cylinder 30 based on the control signal. The valve device 43 is a compressor
Three-way control valve 43a connected to 44 and two sequence valves 4
3b and 43c and each air cylinder 30a, 30b and
The operation of 30c is sequentially performed from the main fluid inlet 45 side.

The control means 40 may be configured to control the operation of the on-off valve 25 based on the pressure signal from the pressure detection means instead of the pump operation switch signal. As shown by the two-dot chain line in FIG. 1, the control means 40 sends the header pressure signal (or the differential pressure signal between the header pressure and the conduit pressure) from the pressure detection means (not shown). A signal that is input and that controls the operation of the on-off valve 25 is output based on this input signal.

(Operation of Embodiment) When the pump 32 is stopped, the on-off valve 25 is in a non-operating state, and at this time, this valve is all closed by the spring force of the single-acting air cylinder. When the operation switch of the pump 32 is turned on, the solenoid valve 33 is opened and the injected fluid flows from the tank 47 into the header 23 through the pipe 31. Since the inside of the header is blocked, the pressure inside the header rises. This increase in pressure is prevented by the safety valve 46 from exceeding a predetermined pressure.

The ON signal of the operation switch is sent to the ON / OFF circuit 41 of the control signal 40, and this circuit turns ON and outputs by this input signal. This ON output signal is sent to the control circuit 42 and this circuit
Turn 42 on. At this time, the control circuit 42 outputs the solenoid drive, whereby the directional control valve 43a is actuated to the state shown in the figure and the compressor 44 on the inlet side air cylinder 30a is operated.
Supply air pressure from. Due to this air pressure, the valve element 29 retracts and comes out of the injection nozzle 21 to open the nozzle opening. At this time, the injection fluid is injected into the conduit 13 from the injection port 22 through the nozzle 21 due to the internal pressure of the header.

When the valve body 29 finishes retreating, the supply pressure in the air cylinder 30a rises, and this pressure actuates the sequence valve 43b, so that the air pressure is supplied to the next air cylinder 30b. In this way, the on-off valve 25 opens sequentially from the inlet side.

When the operation switch of the pump 32 is turned off, the solenoid valve 33 is closed and the supply of the injection fluid to the header 23 is stopped.

The off signal of this operation switch turns off the on / off circuit 41 and turns off the control circuit 42. As a result, the directional control valve 43a moves upward in the drawing due to the spring force to open the air supply side of the air cylinder 30a. As a result, the valve element 29 is advanced by the return spring and penetrates into the nozzle 21 to close the nozzle opening.

The sequence valve 43b is urged by the spring force when the air cylinder 30a is released on the air supply side to be in the released state. In this way, the opening / closing valve 25 sequentially closes the nozzle 21 from the inlet side.

Although the spiral element 14 is used in the illustrated example, it may be a twisting blade of a static mixer. The tapered injection part 11 may be replaced by a tubular part having the same diameter.

FIGS. 2, 3, and 4 show another embodiment of the present invention. In this configuration, a cylindrical pipe 52 forming a header 51 on the outer circumference of the conduit 50 is arranged concentrically with the conduit 50, and a plurality of on-off valves 53 for connecting and disconnecting the header 51 and the inside 50a of the conduit are arranged in the header circumferential direction. To do.

The on-off valve 53 is a normally closed valve in which the valve tube and the nozzle 54 are integrally formed. The valve rod 55 is slidably arranged in the nozzle 54,
The spring 58 constantly urges it to the left in the drawing.

Further, in the nozzle 54, a conduit axial opening 56a and an opening 56b orthogonal to the conduit axial opening 56a are formed in the header nozzle portion, and a conduit internal opening is formed in the tip portion.
56c are formed respectively.

The valve rod 55 is operated by an electromagnetic drive mechanism, that is, a solenoid 59 attached to a base 57 of the opening / closing valve. The solenoid 59 is controlled by the drive output from the control means.

When the on-off valve 53 is in the non-operating state, the valve rod 55 is urged to the left in the drawing by the spring 58 (Fig. 2), the openings 56a, 56b and 56c.
Are all closed, and at this time the conduction between the header and the conduit is cut off.

When the solenoid is energized by the control means, the valve rod 55 moves to the right in the drawing against the spring force (Fig. 3), and all the above openings are opened. At this time, the header and the conduit are in communication. Injection fluid passes through these openings from the header 51 to the inside of the conduit.
Injected into 50a.

(Effects of the Invention) As described above, according to the present invention, the valve means for opening and closing the nozzle opening is automatically controlled according to the pressure in the header directly connected to the conduit through the nozzle opening, so that the main flow in the conduit is reduced. It is possible to prevent backflow into the header of the body and also prevent backflow to the pressure feeding means (raw material tank, etc.). That is, since the pressure in the header, which is directly connected to the conduit that is the cause of the backflow, is monitored, the pressure in the conduit and in the header can be controlled rather than the pressure in the pressure feeding means, which is upstream from the header. The backflow caused by the reverse rotation can be quickly detected, and the operation of the valve means is controlled by the detection signal, whereby the problems such as the sticking due to the backflow are eliminated.
Further, the automatic control can be released from a troublesome manual operation, and a reliable and accurate valve opening / closing operation can be secured.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram including a vertical cross-section showing a dispersion mixer according to the present invention, FIG. 2 is a partial cross-sectional view of a main part of a dispersion mixer of another embodiment showing a valve closed state, and FIG. Shows the valve open state in the same sectional view, and FIG. 4 shows the sectional view taken along the line AA in FIG. 2, respectively. 10 …… Dispersion mixer, 11 …… Injection section 12 …… Static mixer section 14 …… Spiral element 21 …… Injection nozzle, 23 …… Header 25 …… Opening / closing valve, 32 …… Pump 40 …… Control means

Claims (5)

[Scope of utility model registration request] 1. A main fluid passage conduit having a stirring element therein, a header having a nozzle connected to the conduit, and a header for injecting an injection fluid into the conduit through the nozzle; and an injection fluid for the header. And a control means for controlling the operation of the valve means according to the pressure in the header. 2. The dispersion mixer according to claim 1, wherein said control means includes control means for controlling the operation of said valve means in conjunction with the operation of said pressure feeding means. 3. The control means includes control means for outputting a signal for operating the valve means when the output of the pressure detection means for detecting the pressure in the header is equal to or higher than a predetermined pressure.
Dispersion mixer as described. 4. The control means includes control means for operating and controlling the valve means according to an output of a differential pressure detecting means for detecting a differential pressure between the pressure in the header and the pressure in the conduit. 1. The dispersion mixer according to 1. 5. The dispersive mixer according to claim 1, wherein the valve means includes a normally closed valve that closes the nozzle opening when the valve means is in a non-operating state.