JP4873764B2 - Fluid mixing equipment - Google Patents

Description

  The present invention relates to a fluid mixing apparatus that can handle two or more fluids quantitatively and efficiently mix and supply the fluids.

  Conventionally, for example, when mixing and supplying two or more fluids that are corrosive and highly viscous, depending on the fluid to be handled, use at least two chemical pumps or multiple plunger pumps to individually separate the liquids. Many methods are used that are supplied, adjusted by stirring and mixing in a mixing tank, and the like. For example, reciprocating pumps are mainly used to supply chemical materials used in the chemical injection method in civil engineering work, and the mixing fluid is stirred and mixed in the mixing tank to adjust the curing material liquid. Separately prepared grout materials are sent to the injection pipes and injected into the ground.

  In general, an injecting chemical liquid material used in a chemical injecting method employed in civil engineering works is referred to as a chemical liquid material (liquid A) obtained by mixing and adjusting a quick setting injecting material (for example, a water glass type chemical liquid material) and a curing material. ) And general grout materials (cement-based materials (referred to as liquid B, hereinafter the same)) are used, and each is sent separately to the injection pipe (double pipe rod) by a plunger pump. It is mixed at the discharge part at the tip of the injection tube and injected into the ground to improve the ground.

The mixing adjustment of the chemical material (A solution), mixing tank with stirring blades (grout mixer) are mainly used, as a device for use in such mixture adjusted structurally large, Since it is mainly used for temporary installation, there is a problem that it is inconvenient in setting an installation place in a narrow work site such as an urban area.

  On the other hand, Patent Document 1 discloses a prior art in which the operation of a drive cylinder that drives a plunger pump is controlled by a control device to increase the accuracy of the mixing ratio. In this prior art, the plunger pump that supplies one of the fluids to be mixed is configured so that the operation stroke of the drive cylinder is measured by the pulse count by the rotary encoder and the discharge operation of the other plunger pump is performed. Has been. Therefore, in the control of the plunger pump described in this prior art, different plunger pumps are operated relatively, and an attempt is made to rationalize mixing of two liquids having a large difference in mixing ratio. is not.

  In addition, in order to be able to rationally pump the fluid to be handled, there is one that can be driven by combining two plunger pumps on one axis. In this type of pump, when both plunger pumps are connected on one axis by a driving body (cylinder) arranged in the middle position, when one of the front and rear plunger pumps performs a suction operation with the driving body, the other pump Is configured to perform a discharge operation and to continuously reciprocate by reciprocating alternately. Such a reciprocating positive displacement pump is known, for example, from Patent Document 2 or 3.

  However, in the reciprocating positive displacement pump of the prior art, for example, in the one disclosed in Patent Document 2, a seal at a partition-through portion of a piston rod that directly connects two plunger pumps and a drive cylinder (hydraulic cylinder) in one axis. Although it has a characteristic in structure and can pump two liquids constantly, it is limited to supply of a certain amount of two liquids as a pump. Moreover, in the thing of patent document 3, the structure which can connect the reciprocating drive part directly connected to both pumps to a control part, and can control the suction / discharge amount of a pump chamber is shown notionally, Since the chamber is directly connected to the shaft, no countermeasure is taken into account when the fluid handled is corrosive.

  On the other hand, when two or more types of fluids (liquids) that require chemical resistance or sanitary properties are mixed and supplied in the manufacturing process of chemicals and foods, chemical pumps (centrifugal pumps) are generally used for liquid transfer. ) And a stirring and mixing device. However, in an installation using this type of chemical pump and stirring and mixing device, it is difficult to quantitate and adjust a predetermined amount of liquid, and a part of the liquid may be excessive. In addition, when a rotary pump is used, there is a problem that the equipment becomes large because the means for preventing air from entering the fluid to be handled must be taken, the equipment cost is increased, and the running cost is increased. .

Japanese Patent Application Laid-Open No. 10-337459 JP 2000-87847 A JP-A-2-125978

  In the fluid mixing apparatus of the present invention, a plurality of types of handled fluids are supplied in a fixed amount by controlling the reciprocation of a piston in a cylinder type pump (hereinafter simply referred to as a “pump cylinder unit”) and arbitrarily setting the discharge amount. It is an object of the present invention to provide a mixing apparatus having a configuration capable of rationally sending out a handling fluid to be stirred and mixed, and capable of being used in a space-saving manner.

In order to achieve the above object, the fluid mixing apparatus of the present invention comprises:
A plurality of pump cylinder unit sets in which a pair of front and rear cylinders operated by electric drive means reciprocating at an arbitrary setting stroke are connected to one axis, control means for setting the cylinder operating stroke by the electric drive means, and the pump cylinders wherein each device so even without least pumped by the unit comprises a mixing pump and the support frame stirred mixture sends accepts individually rotating chamber around the two kinds of liquids, dispensing a liquid which is mixed with the mixing pump Are connected by piping (first invention).

In the above invention, the electric drive means of the pump cylinder unit is an electric actuator, and it is preferable that the operation stroke of the cylinder can be arbitrarily set by control of a built-in rotary encoder ( second invention).

Further, in the invention, the mixing pump is a rotary pump, separating the suction means of the liquid mixture is directly connected to the suction portion provided at the center of rotation, in this separation suction means is a multiple tube structure tip A central channel on-off valve structure is provided at the center, and when the on-off valve is pushed open by the injection pressure of the fluid supplied to the central channel, the fluid supplied under pressure is separated at the center of rotation. It is preferable that the mixture is stirred and mixed ( third invention).

Furthermore, it is preferable that a water supply pipe connected by switching of the suction pipe is connected to the suction side of the pump cylinder unit and the mixing pump ( fourth invention).

In the above invention, each of the pump cylinder unit and the mixing pump is installed in a support frame having a multi-stage frame structure, and a water storage tank and a chemical material storage tank are mounted on the support frame . Is preferable ( 5th invention).

  According to the fluid mixing device of the present invention, a plurality of sets of pump cylinders using electric drive means as a power source are interlocked, and at least two kinds of liquids to be supplied are mixed and adjusted by a mixing pump at arbitrarily set supply amounts. The mixed fluid can be prepared for the purpose, and there is an effect that it can be supplied efficiently. And the handling liquid can operate the electric drive means by the control means to arbitrarily select and operate the stroke of the pump cylinder, and easily change the discharge amount of the liquid to be handled, so it is easy even during operation There is an advantage that the mixing conditions can be changed.

  In addition, according to the present invention, the transfer fluid generated by the operation of the pump cylinder is continuously and efficiently supplied because the fluid is constantly pressurized alternately by the advance and retreat of the piston in the pair of cylinders and the discharge fluid is joined and sent out. Can do. Further, since the fluid to be handled can be pressurized and sent while maintaining airtightness, the applied pressure can be maintained, and the fluid can be operated without being affected by outside air. Of course, the chemical resistance can be ensured, and the water cleaning of the pipe line can be performed by switching the valve provided in the pipe line, and the cleaning process of the apparatus after using the chemical liquid material can be easily and easily performed. .

FIG. 1 is a schematic view of an embodiment of a mixing apparatus according to the present invention. FIG. 2 is a partial vertical cross-sectional view of the liquid mixture separation suction means in the mixing pump. FIG. 3 is a front view showing the piping system of one embodiment of the present invention with the piping system omitted. FIG. 4 is a left side view showing a part of FIG. 3 in cross section.

  Next, an embodiment of a fluid mixing apparatus according to the present invention will be described with reference to the drawings.

  The mixing apparatus 1 of the present invention shown in FIG. 1 is applied to a mixing apparatus for adjusting a chemical liquid material used in a chemical injection method in civil engineering work. The mixing device 1 is a chemical liquid material (mainly prepared by adjusting silica sol to be used for chemical liquid injection). For example, water glass and a hardening material (for example, dilute sulfuric acid) are pressurized together and efficiently mixed and adjusted. It is configured so that it can be stored and supplied.

  First, the mixing apparatus 1 includes a plurality of sets of a pair of pump cylinder units 10 (represented by all the pump cylinders represented by reference numeral 10) arranged in series so as to reciprocate alternately. An electric actuator 5 as an electric drive means for reciprocating each of the pair of pump cylinder units 10, a control means 40 for controlling the drive of the electric actuator 5, and a plurality of types of fluids pumped by the pump cylinder unit 10 ( For example, a mixing pump 20 for stirring and mixing water glass, dilute sulfuric acid, and fresh water), and a fluid attached to the suction side of the mixing pump 20 and sent by the pump cylinder unit 10 are mixed in a stirring chamber 21 ( Separation suction of mixed liquid that can be supplied separately into the rotating chamber) 22 and pipes for connecting the respective devices are configured out with (described below). In this mixing apparatus 1, two types of fluid storage tanks 60 and 62 and a water storage tank 61 are separately mounted on the upper portion of the support frame 50.

  The pump cylinder unit 10 has cylinders 10A and 10B having the required dimensions (hereinafter, for each cylinder of each pump cylinder unit, "A" is assigned to one cylinder and "A" is assigned to the other cylinder. A pair of piston rods 10b are opposed to each other and positioned on the same axis, and the piston rod 10b common to both cylinders 10A and 10B is connected to an electric actuator. 5 is connected to the output unit 5a so as to advance and retreat a required distance (required stroke). The pump cylinder unit 10 has a pair of cylinders 10A and 10B and an electric actuator 5 integrally assembled on a base frame (described later), and has a unit structure for each set (however, Not limited).

Although the electric actuator 5 in this embodiment is not shown in detail for the detailed structure, the electric actuator 5 includes an operation piece that is reciprocated by a ball screw of a required length that is driven to rotate by a servo motor. The operation piece and the both cylinders The piston rods 10b of 10A and 10B are connected via a bracket 5a (output unit), and are configured to reciprocate the pistons 10c and 10c of the pump cylinder unit 10 by driving the electric actuator 5. In the pump cylinder unit 10, the cylinder body, the piston 10c, the rod 10b, and the like are formed of a corrosion-resistant material.

  The pump cylinder unit 10 configured as described above is mounted and supported in two upper and lower stages on a support frame 50 formed to be movable in plural sets (see FIG. 3). The electric actuator 5 in each pump cylinder unit 10 is provided with a rotary encoder, and can be controlled by receiving a pulse signal from the rotary encoder according to a program set in the control means 40 to set each drive condition (operation stroke). Has been. Therefore, one stroke of the piston 10c of each pump cylinder unit 10, in other words, the discharge amount can be arbitrarily set.

  The cylinder piston chamber 10a of the pump cylinder unit 10 is provided with a fluid inlet / outlet port 10e, to which a suction side pipe 31 and a discharge side pipe 34 are connected. The suction side pipe 31 is connected to a mixing pump 20 via a check valve 33a that allows only suction from the fluid tank (storage tank 62), and the discharge side pipe 34 is connected to the mixing pump 20 via a check valve 33b that allows only discharge. It is connected.

  As shown in FIG. 2, the mixing pump 20 is a rotary pump, and a suction unit 22 for separating the liquid to be mixed is directly connected to a suction part. As this mixing pump 22, a motor part having a magnet drive type and a pump part having a chemical resistant structure is used (but not limited to this).

  Further, as shown in FIG. 2, the separation suction means 22 introduces the two kinds of mixed liquids (for example, water glass and dilute sulfuric acid) into the inflow sections 22A and 22B and introduces the two kinds of fluids into the suction section. The flow path and the water introduction part are combined in series. In addition, in the inflow section 22A of one fluid (for example, dilute sulfuric acid) before mixing, an injection pipe 23 is arranged in the axial direction at the center position, and this injection pipe 23 is provided with an on-off valve structure 24 for closing the tip. The fluid is separated from the other fluid (for example, water glass) inflow section 22B, and the two fluids merge at the rotation center portion 27a of the impeller 27 of the pump. In addition to the two types of fluid inflow compartments, a water inflow compartment 22C is provided, and the water inflow compartment 22C communicates with the other fluid (for example, water glass) inflow compartment 22B. The on-off valve structure 24 provided at the distal end of the injection pipe 23 sends the fluid into the suction part (rotation center part 27a) only when the injection pressure is applied to the fluid on the injection pipe 23 side, and the applied pressure is increased. When does not act, the injection tube 23 side is closed. As the on-off valve structure 24, as one embodiment, a plurality of liquid outlet holes 25 are provided at the distal end portion of the injection pipe 23, and a soft tube 26 that opens and closes the liquid outlet hole 25 covers the distal end portion of the injection pipe 23. When the liquid pressure is applied to the liquid outlet hole 25, the tube 26 is expanded to form a gap on the outer periphery of the pipe, and the liquid can flow out through the gap. In addition, the code | symbol 21 is a rotation chamber in the figure.

  Each of these aforementioned devices is connected by piping as shown in FIG. First, the cylinders 10A and 10B of the pair of pump cylinder units 10 have a water glass supply pipe 31 branched from a three-way switching valve 32 to an inlet / outlet port 10e of each piston chamber 10a, and a check valve 33a on the suction side. The discharge sides are joined together via a check valve 33b, and then connected to the separation suction means 22 to the mixing pump 20 by a pipe 34.

  In another set of pump cylinder units 11, dilute sulfuric acid supply pipes 36 branch from the three-way switching valve 32a to the inlet / outlet port 11e of the piston chamber 11a of the cylinders 11A and 11B, and check valves 33d are respectively provided on the suction side. The discharge side is connected to a separate suction means 22 attached to the post-merging mixing pump 20 by a pipe 37 via a check valve 33e.

  Each of the three-way switching valves 32 and 32a provided in the water glass supply pipe 31 and the dilute sulfuric acid supply pipe 36 can be cleaned by supplying cleaning water from the water storage tank 61 to the pump cylinder units 10 and 11 by switching. The cleaning water pipes 38 and 38 'are connected to the main body.

  Furthermore, in the other set of pump cylinder units 12, similarly to the above, water supply pipes 37 are connected to the inlets / outlets 12e of the piston chambers 12a via check valves 33f on the suction side and check valves 33g on the discharge side, respectively. Is connected to the separation suction means 22 attached to the mixing pump 20 via a pipe 37 '.

  The pump cylinder units 10, 11, 12 connected in this way are controlled by the control means 40 to control the operating conditions of the electric actuators 5, and the stroke setting and driving of the pistons are managed. Therefore, the discharge amount of each pump cylinder unit 10, 11, 12, in other words, the mixing ratio and the liquid supply amount can be arbitrarily set simply by adjusting the mixing of the supply liquid by controlling the electric actuator 5. In the figure, reference numeral 45 is an on-off valve, and 39 is a discharge pipe of the mixing pump 20. Then, the injected medicinal solution mixed by the mixing pump 20 is once sent to the storage tank 65 installed on the upper portion of the support frame 50 so that it can be supplied to the medicinal solution injecting location through a separate pipe.

  Although not shown, the control means 40 is attached to the side surface of the support frame 50 and includes a microcomputer having a program capable of setting a required condition inside a box having a required dimension, and each pump cylinder unit. And a control circuit for operating the power supply, a power operation device for the electric actuator, and the like, and can be controlled so that the stroke of the cylinder piston can be arbitrarily set by receiving a signal from the rotary encoder built in each electric actuator.

  The mixing apparatus 1 configured as described above prepares required injection materials in respective storage tanks, sets the driving conditions of each set of electric actuators 5 by the control means 40, and then sets the electric actuators 5 according to the setting conditions. When the pump cylinder units 10, 11, and 12 are driven all at once, the piston rods 10b, 11b, and 12b of the pump cylinder units 10, 11, and 12 are advanced and retracted by the electric actuator 5, When the piston moves forward, the piston of the other cylinder moves backward, and the pistons in the pair of cylinders reciprocate alternately for one stroke. The liquid discharge amount in the pump unit can be set by setting the one stroke of the piston to the required discharge amount in the control means 40.

  Then, in one set of cylinders 10A and 10B, when one piston 10c moves backward, the check valve 33b is pushed open from the inside of the cylinder 10B through the inlet / outlet 10e, and the water glass material is sent to the pipe 34. On the other hand, in the other cylinder 10A to be interlocked, when the piston 10c moves forward, the water glass material in the piston chamber 10a pushes the check valve 33b through the inlet / outlet port 10e and pressurizes it through a connected pipe. It is sent out to the pipe 34 to the mixing pump 20.

Wherein both cylinders 10A, the 10B, the operation of the electric actuator 5, both the piston chamber 10a to be operated simultaneously, 10a 'sometimes water glass material that is sucked into the check valve 33b which is located on the discharge side, 33b is closed The check valves 33a and 33a are pushed open to the water glass material supply side and supplied to the piston chambers 10a and 10a '. On the other hand, when pressure is sent out from the piston chambers 10a and 10a ', the reverse flow is blocked by the action of the check valves 33a and 33a on the suction side, and the check valves 33b and 33b on the send side are pushed open and mixed through the piping. 20 is sent to the pipe line 34 to 20. Thus, in the pump cylinder unit 10, the water glass materials that are alternately sent out by the operation of the pair of cylinders 10 </ b> A and 10 </ b> B merge and are continuously supplied to the mixing pump 20.

  As with the pump cylinder unit 10, the other set of pump cylinder units 11 sucks dilute sulfuric acid into the piston chamber 11a when one piston 11c moves backward by the forward / backward drive of the piston rod 11b driven by the electric actuator 5. Inflow. Further, when the other piston 11c moves forward, dilute sulfuric acid is pressurized and sent from the piston chamber 11a of the cylinder 11B. At this time, the backflow is blocked by the operation of the check valve 33d from the suction / discharge port 11e of both cylinders 11A and 11B, and the check valve 33e is pushed open to dilute the sulfuric acid. After that, it is supplied to the mixing pump 20 via 35.

  Further, in the other set of pump cylinder units 12, as in the case of the two sets of pump cylinder units 10 and 11, when one piston 12c moves backward by the forward / backward drive of the piston rod 12b driven by the electric actuator 5, the piston chamber Water is sucked into the water storage tank 61 to 12a. Further, when the other piston 12c moves forward, water is pressurized and sent from the piston chamber 12a to the pipe 37 '. At the time of this discharge, in the discharge side pipes 37 ′ of both cylinders 12A and 12B, the backflow of water to the supply side is blocked by the operation of the check valve 33f, and the discharge side check valve 33g is pushed open and sent out. Is done. Thus, the water pressure-delivered from the water delivery pipe 37 ′ is sent to the suction portion (rotation center portion 27 a) of the mixing pump 20 through the separate suction means 22 attached to the mixing pump 20.

  In the mixing pump 20, water glass, dilute sulfuric acid, and water are individually supplied to the suction portion via the separate suction means 22. In the separation suction means 22, dilute sulfuric acid flows from the inflow section 22A into the central injection pipe 23, and water glass is injected into the outside through the inflow section 22B and water through the inflow section 22C. Yes. The fluids reach the rotation center portion 27a of the mixing pump 20 and all the liquids are combined. At the same time, the fluids are discharged into the rotation chamber 21 by the centrifugal force of the impeller 27, and are stirred and mixed at high speed. In this stirring and mixing, dilute sulfuric acid is injected into the water glass flowing at high speed in the suction part, and water is added to this and mixed in the rotating chamber 21. Therefore, a rapid coupling reaction due to the merging of the three parties. Is prevented and gelation is suppressed by stirring and mixing with the impeller 27 to prepare a curing material liquid. The cured material liquid thus prepared is supplied to the storage tank 65 mounted on the upper portion of the support frame 50 through the delivery pipe 39 and stored. The stored curable material liquid is sent to, for example, an injection tube rod by a separate pump, and used for a chemical liquid injection operation. In the mixing device 1, the prepared curing material liquid can be arbitrarily set in the mixing ratio and the discharge amount by changing the setting of the piston stroke in each pump unit in the control means 40.

  In the pump cylinder units 10, 11, water supply pipes 38, 38 'from a water supply source (water storage tank 61) are connected to three-way switching valves 32a, 32b in the pipes to the piston chambers 10a, 11a, respectively. Therefore, if the three-way switching valves 32a and 32b are switched to the water supply pipes 38 and 38 ', both the pump cylinder units 10 and 11 and the pipes and the mixing pump 20 connected thereto can be washed with water.

  On the other hand, each storage tank 60, 61, 62 of water glass, water, and dilute sulfuric acid is a separate storage tank, and each of the storage tanks 60, 61, 62 is provided with a liquid level detector (not shown) and a liquid outlet. If the storage tanks 60, 61, 62 configured as described above can be installed on the upper part of the mixing device 1 and each pipe is connected, each fluid can be smoothly supplied to the equipment using the water head pressure. can do. In addition, by arranging the pump cylinder units 10, 11, 12 and the pump equipment and the storage tank in a three-dimensional structure, the installation space can be reduced and used in a narrow place. Facilitates use as an infusion preparation device.

  Further, in the mixing apparatus 1 of the present embodiment, as described above, the electric actuator that drives each pump cylinder unit controls the movement of the piston based on a program in which the built-in rotary encoder is preset by the control means. Thus, if the required stroke is set, an arbitrary discharge amount can be obtained by the setting. Further, since the discharge amount can be set freely during operation, the preparation conditions of the chemical solution injection material can be arbitrarily set and changed in accordance with the injection work conditions at the work site. Therefore, there is an advantage that it is possible to operate in accordance with the use situation.

  In the description of the embodiment, the pump cylinder unit has been described as a piston-type cylinder, but a plunger-type cylinder can also be adopted, and the same effect can be obtained. Moreover, although the case where the installed pump cylinder unit was 3 sets was described, 3 sets or more may be sufficient.

  The above describes the case where the mixing device of the present invention is used for the construction of the chemical injection method for civil engineering work, but according to the gist of the present invention, it can be used as other fluid mixing means.

  The mixing apparatus according to the present invention can be used for mixing and supplying two or more kinds of fluids, for example, for the mixing process of two or more kinds of liquids in the manufacturing process of chemical products, the transfer of raw material liquids in the food industry, etc. Can do. In addition, when a variety of fluids are handled, two or more pump cylinder units can be arranged and used in combination as necessary. In the mixing apparatus of the present invention, when the viscosity of the fluid to be handled needs to be adjusted, the mixing operation can be facilitated by adjusting the viscosity by interposing a heat exchange device (heater or cooler) in the pipe. it can.

  The mixing apparatus of the present invention can rationally carry out an operation of mixing and supplying two or more kinds of fluids under pressure. Therefore, it can be used quantitatively for supplying chemicals in the chemical injection method in civil engineering work, and for mixing and transferring fluids in the manufacturing process of chemicals, chemicals, and food ingredients.

DESCRIPTION OF SYMBOLS 1 Mixing device 5 Electric actuator 10, 11, 12 Pump cylinder unit 10A, 10B, 11A, 11B, 12A, 12B Cylinder 10a, 11a, 12a Piston chamber 10b, 11b, 12b Piston rod 20 Mixing pump 22 Separation suction means 23 Injection pipe 24 On-off valve structure 27 Impeller 27a Center of rotation 31, 34, 35, 36, 37 Piping 32a, 32b Three-way switching valve 33a, 33b, 33d, 33e, 33f, 33g Check valve 40 Control means 50 Support frame 60, 61, 62 Storage tank 65 Mixed fluid storage tank

Claims (5)

A plurality of pump cylinder unit sets in which a pair of front and rear cylinders operated by electric drive means reciprocating at an arbitrary setting stroke are connected to one axis, control means for setting the cylinder operating stroke by the electric drive means, and the pump cylinders includes a mixing pump and the support frame and sends stirred mixture is pressed separately into the rotation chamber around the two kinds of liquids even without least supplied by the unit, are merged discharge fluid from the pair of cylinders of the pump cylinder unit The fluid mixing device is characterized in that each of the devices is connected by piping so as to continuously supply to the mixing pump and to send out the liquid mixed by the mixing pump. The fluid mixing device according to claim 1, wherein the electric drive means of the pump cylinder unit is an electric actuator, and an operation stroke of the cylinder can be arbitrarily set by control of a built-in rotary encoder. The mixing pump is a rotary pump, the separation suction means of the liquid mixture to the suction portion provided at the rotation center is directly connected, the central channel at the tip is in the multi-tube structure in this fractionation suction means A structure in which an on-off valve structure is provided, and when the on-off valve is pushed open by the injection pressure of the fluid supplied to the central flow path, the fluid supplied under pressure is separated and joined at the center of rotation to be stirred and mixed The fluid mixing device according to claim 1. The fluid mixing apparatus according to claim 1, wherein a water supply pipe communicated by switching of a suction pipe is connected to a suction side of the pump cylinder unit and the mixing pump. 2. The pump cylinder unit and the mixing pump are installed in a support frame that is framed in a multi-stage structure, and a water storage tank and a chemical material storage tank are mounted on the support frame. Fluid mixing device.