JP2021122814A - Dilution apparatus and spray device - Google Patents

Abstract

To provide a dilution apparatus which enables even a person unaccustomed in an operation to stably provide a desirable mixing ratio without pulsation even when a positive flow regulation using an inexpensive controller is not performed.SOLUTION: A dilution apparatus includes an undiluted liquid tank which stores undiluted liquid, a dilution liquid tank which stores dilution liquid while retaining a predetermined first liquid level height, an undiluted liquid circulation pump which sucks undiluted liquid from the undiluted liquid tank, a return pipe unit having a storage part which receives undiluted liquid ejected from the undiluted liquid circulation pump and stores the undiluted liquid while retaining a predetermined second liquid level higher than the first liquid level, a dilution cell unit including a mixing part which is arranged on the lower side of the dilution liquid tank and produces mixed liquid by mixing dilution liquid and undiluted liquid and a suction pump which sucks the mixed liquid produced in the dilution cell unit. The return pipe unit is arranged so that an installation height can be changed, and a mixing rate of undiluted liquid and dilution liquid can be changed by changing an installation height of the return pipe unit.SELECTED DRAWING: Figure 1

Description

The present invention is a diluting device that dilutes a stock solution with a diluent, which prevents pulsation when mixing the stock solution and the diluted solution, suppresses instability of the mixing ratio, and mixes a desired mixing ratio. Regarding the technology for stable production.

Various diluting devices have been developed in which a stock solution of a high-concentration drug having a predetermined effect is diluted with a diluting solution and supplied to a point of use.

In such a diluting device, when the undiluted solution and the diluted solution are mixed at a predetermined mixing ratio to obtain a mixed solution having a desired concentration, a desired mixing ratio can be stably obtained, and a desired mixing ratio is obtained. It is required that the mixing ratio can be easily changed.

In order to obtain a desired mixing ratio, it is necessary to adjust the flow rates of the undiluted solution and / or the diluted solution. For example, in Patent Document 1, a diaphragm pump is provided in each system of the undiluted solution and the diluted solution, and the diaphragm pump is provided. Each fluid is supplied by. (Patent Document 1)

Further, in Patent Document 2, a flow rate adjusting valve is provided in each supply path of the undiluted solution and the diluted solution. (Patent Document 2)

JP-A-2017-127815 Patent No. 5990826

According to the technique disclosed in Patent Document 1, by controlling the diaphragm pump, the flow rates of the undiluted solution and the diluted solution can be adjusted, respectively, and a mixed solution having a desired mixing ratio can be obtained. However, if the pumps are installed in both the stock solution and the diluent systems, the number of devices increases and the structure becomes complicated, the pumps require regular maintenance, and the operation is hindered. There was a problem that it was difficult for human resources who were unfamiliar with the work to make adjustments.

Further, in particular, when the stock solution is diluted at a high magnification of 100 times or more and the flow rate is small, there is a problem that the mixing ratio becomes unstable due to the influence of the time difference of supply due to the operation of a plurality of pumps. rice field.

Further, according to Patent Document 2, by adjusting the opening degree of the flow rate adjusting valve, the flow rates of the undiluted solution and the diluted solution can be adjusted, respectively, and a mixed solution having a desired mixing ratio can be obtained. However, there is a problem that a control mechanism and a control circuit for adjusting the opening degree of the flow rate adjusting valve are required, the structure is complicated, and maintenance cost and time are required. Moreover, there is a problem that it is difficult for a human resource who is unfamiliar with the work to make a delicate adjustment of the flow rate.

The present invention has been made in view of such a problem, and even a human resource who is unfamiliar with the work is stable without pulsation without actively adjusting the flow rate by using an expensive control device. It is an object of the present invention to provide a diluting device capable of obtaining a desired mixing ratio.

The inventors of the present invention arrange a suction pump that sucks the mixed solution downstream of the diluted cell unit that mixes the undiluted solution and the diluted solution to generate a mixed solution, and specifies the diluted solution upstream of the diluted cell unit. A diluent tank that holds the liquid level is placed, and a return pipe unit that stores the undiluted solution while holding the specified liquid level is placed, and the suction force from the suction pump and the gravity drop method are combined to dilute. By supplying the diluted cell unit from the tank and the return pipe unit, it has been found that a constant ratio of mixed liquid can always be generated regardless of the amount of suction of the suction pump without the occurrence of pulsation. Diluted.

The present invention provides the following solutions.

The invention according to the first feature is to suck the undiluted solution stored in the undiluted solution tank, the undiluted solution tank for storing the undiluted solution, the diluted solution tank for storing the diluted solution while maintaining a predetermined first liquid level. A return pipe unit having a storage unit that receives the undiluted solution discharged from the undiluted solution circulation pump and stores the undiluted solution while maintaining a predetermined second liquid level height higher than the first liquid level height, and dilution. A dilution cell unit, which is located below the liquid tank and has a mixing unit for generating a mixed solution by mixing a diluent supplied by gravity from the diluent tank and a stock solution supplied by gravity from the storage unit, and dilution. It is a dilution device located on the downstream side of the cell unit and equipped with a suction pump that sucks the mixed solution generated by the dilution cell unit. The return pipe unit is arranged so that the installation height can be changed and returns. The mixing ratio of the undiluted solution and the diluted solution can be changed by changing the installation height of the tube unit.

According to the invention according to the first feature, in the diluent tank and the return pipe unit, the liquid level heights of the diluted water and the stock solution are always maintained at predetermined values according to the mixing ratio (dilution concentration). Since the predetermined water head pressure is always stably applied and the flow rate from the diluent tank is larger than the suction amount by the suction pump, it is possible to generate a mixed solution in a predetermined ratio without causing pulsation by the suction pump. It is possible to produce a mixed solution having a predetermined ratio.

Further, the height at which the return pipe unit is arranged determines the difference in head pressure between the undiluted solution and the diluted solution, which determines the mixing ratio of the undiluted solution and the diluted solution. Even if it is not used, a desired ratio of the mixed solution can be produced by changing the height of the return tube unit.

That is, according to the present invention, even when a mixed liquid having a high magnification and a small amount is produced, one suction pump and a stock solution circulation pump can be used without actively adjusting the flow rate by using an expensive control device. Only by the operation, a mixed solution having a desired ratio can be stably produced.

The invention according to the second feature is the invention according to the first feature, in which the dilution cell unit has a stock solution supply port into which the stock solution supplied from the storage unit flows in and supplies the inflowing stock solution to the mixing unit. It is equipped with a stock solution supply path and an air bleeding flow path connected in the middle of the stock solution supply path, and the diluting device is further equipped with an air bleeding pump that sucks the stock solution from the stock solution tank and sends it to the air bleeding flow path. The undiluted solution stored in the undiluted solution supply path is discharged from the undiluted solution supply port via the tank, the air bleeding pump, and the air bleeding flow path so that the undiluted solution can be returned to the storage unit.

According to the invention according to the second feature, by forming a route for refluxing the undiluted solution from the dilution cell unit to the storage portion of the return pipe unit, air in the undiluted solution that hinders the achievement of a highly accurate mixing ratio is evacuated. Can provide a diluting device capable of.

The invention according to the third feature is the invention according to the second feature, in which the storage portion is composed of tubular members arranged in the horizontal direction, and the return pipe unit is one end in the horizontal direction of the storage portion. An inflow pipe that is connected to the upper part of the side and receives the undiluted solution discharged from the undiluted solution circulation pump and supplies it to the storage unit, and is connected to the lower part of the horizontal end side of the storage unit between the storage unit and the undiluted solution supply path. A connecting pipe to be connected, a return pipe connected to the lower part on the other end side in the horizontal direction of the storage part, and a part of the undiluted solution flowing into the storage part to be returned to the undiluted solution tank, and a side to which the connecting pipe is connected to the storage part. It is separated from the side to which the return pipe is connected, and is provided with a bottom raising portion in which the height of the bottom surface is set higher than other portions in the storage portion.

According to the invention according to the third feature, since the storage portion is separated by the bottom raising portion between the side connected to the undiluted solution supply path and the side connected to the undiluted solution tank, excess undiluted solution is allowed to get over the bottom raising portion. The liquid can be returned to the undiluted liquid tank, and the liquid level can be maintained at a predetermined second liquid level.

At that time, since the inflow pipe and the connecting pipe are located on the same side in the horizontal direction, it is possible to prevent the undiluted solution from being returned to the undiluted solution tank more than necessary.

The invention according to the fourth feature is the invention according to the second or third feature, in which the storage portion provides an air vent hole for communicating the inside of the storage portion with the atmosphere.

According to the invention according to the fourth feature, since the storage unit has an air vent hole communicating with the atmosphere, the pressure in the storage unit is maintained at atmospheric pressure. Therefore, the air in the undiluted solution is smoothly released into the atmosphere from the liquid surface of the undiluted solution without staying in the undiluted solution.

The invention according to the fifth feature is an invention according to the first to fourth features, wherein the dilution cell unit is a water flow tube for a stock solution having a predetermined cross-sectional area and length for supplying the stock solution to the mixing portion. , It has a water passing part for a diluting liquid that supplies a diluting liquid to the mixing part, and the outlet end of the water passing tube for the undiluted solution forms an inclined end face.

According to the invention according to the fifth feature, since the outlet end of the undiluted water flow tube forms an inclined end face, the contact area between the outlet end and the outflowing diluent is increased, and stable discharge is possible. It becomes.

The invention according to the sixth feature is the invention according to the fifth feature, in which the outlet end of the undiluted water flow tube is further rounded.

According to the invention according to the sixth feature, since the outlet end of the undiluted water flow tube is further formed to be rounded, it is possible to prevent injuries during assembly or replacement of the undiluted water flow tube. can.

The invention according to the seventh feature is the invention according to the fifth or sixth feature, in which an injection needle is used as a water flow tube for a stock solution.

According to the invention according to the seventh feature, by using an injection needle whose cross-sectional area and length are determined by the gauge (model number) to be used, it can be easily constructed by using an easily available commercially available article. Can provide a diluting device capable of.

The invention according to the eighth feature uses the invention according to the first to seventh features, and provides a spraying device provided with a sprayer for spraying a mixed solution sucked by a suction pump.

According to the invention according to the eighth feature, it is possible to provide a spraying device capable of spraying a mixed solution adjusted to a desired concentration from a sprayer.

According to the present invention, even a human resource who is unfamiliar with the work can obtain a stable desired mixing ratio without pulsation without actively adjusting the flow rate by using an expensive control device. Can be provided.

FIG. 1 is a schematic view showing the overall configuration of the diluting device 1 according to the present embodiment. FIG. 2 is a schematic view showing an example of the stock solution tank 10 of the diluting device 1 according to the present embodiment. FIG. 2A shows a state in which the valve is closed and there is no flow, and FIG. 2B shows a state in which the valve is open and there is a flow. FIG. 3 is a schematic view showing a dilution cell unit 30 of the dilution device 1 according to the present embodiment. FIG. 4 is a schematic view showing the cartridge unit 32 according to the present embodiment. FIG. 5 is a schematic view showing the configuration of the return pipe unit 50 according to the present embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that this is only an example, and the technical scope of the present invention is not limited to this.

[Overall configuration of diluter]
The overall configuration of the diluting device 1 according to the present embodiment will be described with reference to FIG.

As shown in FIG. 1, the diluting device 1 of the present embodiment is a dilution cell unit that mixes the undiluted solution tank 10 for storing the undiluted solution, the diluted solution tank 20 for storing the undiluted solution, and the undiluted solution and the diluted solution at a predetermined ratio. 30 and the stock solution circulation pump 40 for supplying the stock solution from the stock solution tank 10 to the dilution cell unit 30 via the return pipe unit 50, and the stock solution circulation pump 40 and the dilution cell unit 30 are provided to dilute the stock solution. The return pipe unit 50 having a pipe for moving back and forth between the cell unit 30 and a pipe for returning to the undiluted solution tank 10 and the pipe between the return pipe unit 50 and the dilution cell unit 30 and the air generated in the dilution cell unit 30 are removed. It is composed of an air bleeding pump 60 for this purpose and a suction pump 70 that sucks a mixed solution of a mixed solution of the undiluted solution and the diluted solution at a predetermined suction pressure and supplies the mixed solution to a supply device (not shown).

Further, in the present embodiment, a liquid agent having a high concentration and a viscosity equivalent to that of water, which has a sterilizing effect as a stock solution, is used, and water is used as a diluent to produce a low-concentration mixed liquid agent. Imagine a spraying device that sprays atomized material from a sprayer using a ultrasonic transducer.

[Structure of undiluted solution tank 10]
The stock solution tank 10 supplies the stock solution supplied from the supply source to the dilution cell unit 30, which will be described later, while storing the stock solution while maintaining a predetermined liquid level. As a mechanism for maintaining a predetermined liquid level, a well-known means such as a ball tap is used.

Next, the undiluted solution tank 10 adopting the ball tap type will be described with reference to FIG. FIG. 2A shows a schematic view of the stock solution tank 10 in a state where the valve is closed and there is no flow, and FIG. 2B shows a state in which the valve is open and a flow is generated.

As an example shown in FIG. 2, the ball tap type stock solution tank 10 includes a tank body 10a, an injection port 10b, a connecting hole 10c, an opening / closing member 10d, a floating portion 10e, a lever portion 10f, a discharge port 10g, a circulation port 10h, and the like. It has a rotating shaft 10i.

One end of the lever portion 10f hangs down from the opening / closing member 10d, bends in the horizontal direction, and then the other end is connected to the floating portion 10e. Further, the side of the lever portion 10f connected to the opening / closing member 10d is connected to the rotating shaft 10i that can rotate in the tank body 10a, and the lever portion 10f is inside the tank body 10a via the rotating shaft 10i. It is rotatably connected upward. The opening / closing member 10d is rotatably connected to the inside and upper part of the tank body 10a together with the lever portion 10f so that the opening / closing of the connecting hole 10c can be switched. Then, the moments of the floating portion 10e and the lever portion 10f are set so that the opening / closing member 10d closes the connecting hole 10c when the liquid level in the tank body 10a is at a set height.

Now, in the state shown in FIG. 2A, when the undiluted solution is discharged from the discharge port 10 g, the floating portion 10e and the lever portion 10f move downward with the rotation shaft 10i as the axis as the liquid level in the undiluted solution tank 10 drops. Rotates to. As a result, the opening / closing member 10d connected to one end of the lever portion 10f also rotates downward, so that the connecting hole 10c is opened and the state shown in FIG. Therefore, it is replenished.

When the undiluted solution is replenished, the floating portion 10e rises as the liquid level rises, and when the liquid level recovers to the set height as shown in FIG. 2A, the opening / closing member 10d opens the connecting hole 10c. When the downward moment from the rotating shaft 10i due to the surface pressure and the upward moment from the rotating shaft 10i of the floating portion 10e connected to the lever 10f are balanced, the injection of the undiluted solution through the injection port 10b is stopped. do.

By such a principle, the liquid level functions to maintain the set height.

[Structure of diluent tank 20]
The diluent tank 20 supplies the diluent supplied from the supply source to the dilution cell unit 30 while maintaining the liquid level higher than the reference plane height h0, which will be described later, by a predetermined first liquid level height h1. It is a thing. As a mechanism for maintaining the predetermined first liquid level height h1, a well-known means such as a ball tap is used as in the undiluted liquid tank 10 shown in FIG. 2 as an example.

The diluent tank 20 is arranged at a position higher than the dilution cell unit 30 so that the diluent can be supplied to the dilution cell unit 30 described later by gravity. Specifically, the height of the liquid level is set at a position higher than the height h0 of the reference surface described later in the dilution cell unit 30 by a predetermined first liquid level height h1.

As long as the liquid level can be maintained at a predetermined height, a method other than the ball tap type can be used as the stock solution tank 10 and the diluent tank 20.

[Structure of Diluted Cell Unit 30]
The dilution cell unit 30 will be described with reference to FIG. The dilution cell unit 30 is a piping unit 31 that receives the stock solution and the diluent supplied from the stock solution tank 10 and the diluent tank 20, and a replaceable cartridge that adjusts the supplied stock solution and the diluent to a predetermined flow rate. It is composed of a unit 32, a dilution cell unit 33 that mixes a stock solution and a diluent adjusted to a predetermined flow rate to generate a mixed solution, and a discharge port 34 that discharges the generated mixed solution to a supply device (not shown). ..

[Configuration of piping unit 31]
The piping unit 31 is a unit located above the dilution cell unit 30, and is a stock solution supply port 31a, a stock solution supply path 31b, a diluent supply port 31c, a diluent supply path 31d, and air, which are inlets of the stock solution. It is composed of a draft flow path 31e.

The stock solution supply port 31a is arranged on the side of the piping unit 31. The undiluted solution supply path 31b is a substantially L-shaped flow path in which the undiluted solution supplied from the undiluted solution supply port 31a arranged above the piping unit 31 is rotated substantially vertically downward to form a downward flow (note that the undiluted solution supply path 31b). , It does not necessarily have to be approximately L-shaped). Further, an air bleeding flow path 31e for bleeding air generated by the piping unit 31 is connected in the middle of the downward flow path of the undiluted solution supply path 31b.

The air bleeding flow path 31e is formed by turning a substantially vertically upward flow into a lateral flow, and is connected from the side in the middle of a flow path arranged substantially vertically below the stock solution supply path 31b. It is a character-shaped flow path. The air bleeding flow path 31e is connected to the air bleeding pump discharge port 60e of the air bleeding pump 60 described later, and supplies the undiluted solution discharged from the air bleeding pump 60 to the undiluted solution supply path 31b. At this time, the air bleeding pump 60 is installed below the air bleeding flow path 31e. If the air bleeding pump 60 is installed above the air bleeding flow path 31e, the air inside the pipe tries to rise (backflow) in the direction of the air bleeding pump and cannot be completely evacuated, which hinders reliable air bleeding. This is because it affects the dilution accuracy.

With such a configuration, the undiluted solution supplied from the side undiluted solution supply port 31a turns downward and is supplied toward the dilution cell portion 33 through the inner diameter of the undiluted solution water flow tube 32a located downward according to gravity. Will be done.

The diluent supply port 31c is arranged above the piping unit 31. The diluent supply path 31d is a flow path for flowing the diluent supplied from the diluent supply port 31c arranged in the upper part of the piping unit 31 downward.

With such a configuration, the diluent supplied from the upper diluent supply port 31c is supplied toward the cartridge portion 32 located below according to gravity.

[Structure of cartridge unit 32]
The cartridge unit 32 will be described with reference to FIG. The cartridge unit 32 of the dilution cell unit 30 connects the piping unit 31 of the dilution cell unit 30 and the dilution cell unit 33, and adjusts the stock solution and the dilution solution supplied from the piping unit 31 to predetermined flow rates, respectively, to adjust the dilution cell unit. It supplies 33.

The cartridge portion 32 is composed of a stock solution water passage tube 32a, a stock solution bush 32b, a diluent water passage portion 32c, and a connection portion 32d.

The undiluted water flow tube 32a is a needle-shaped tube that adjusts the undiluted solution supplied from the undiluted solution supply path 31b to a predetermined flow rate and supplies it to the dilution cell portion 33 from an outlet formed at the lower end portion. It has a cross-sectional area and a predetermined length.

The lower end of the undiluted water flow tube 32a has an end face inclined with respect to the supply direction in order to ensure a stable supply at the outlet. Furthermore, in order to prevent the tip from becoming too sharp, the end is rounded.

As described above, a commercially available injection needle can be used as the undiluted water flow tube 32a having a predetermined cross-sectional area and length and having an inclined end portion. Since the inner diameter (that is, the flow path cross-sectional area) of the injection needle is determined by the standard gauge, the cross-sectional area can be changed depending on the selected gauge.

In this embodiment, although details will be described later, the discharge amount from the undiluted water flow tube 32a obtained by adjusting the arrangement height of the return pipe unit 50 to adjust the head pressure difference H between the undiluted solution and the diluted solution. The structure is such that the dilution concentration is adjusted by the change in the above, but depending on the dilution concentration, it may not be possible to adjust the water head pressure difference H. In such a case, the cartridge portion 32 is separated from the upper piping unit 31 and the lower dilution cell portion 33, and the stock solution water flow tube 32a is replaced with a stock solution water flow tube 32a having a different cross-sectional area and length. The desired dilution concentration can be obtained by attaching the mixture.

The stock solution bush 32b is a ring-shaped member formed of an elastic material for attaching the stock solution water flow tube 32a to the connection portion 32d, and has a hole in the substantially center for fitting the stock solution water flow tube 32a. It is installed.

The water passing portion 32c for the diluent is a portion for supplying the diluent supplied from the diluent supply path 31d to the first diluent receiving portion 33a of the dilution cell portion 33, which will be described later, and is formed in the connecting portion 32d. It is configured as a hole having a predetermined cross-sectional area and a predetermined length.

The connection portion 32d is a member in which a hole for attaching the stock solution bush 32b and a hole for the diluent water passage portion 32c are bored, and the dilution cell portion 33 located below and the piping unit 31 located above. It is a member having substantially the same shape in cross section. The connecting portion 32d includes a sealing packing that seals between the connecting portion 32d and the piping unit 31, and a sealing packing having a different shape that seals between the connecting portion 32d and the dilution cell portion 33.

Then, by fitting the undiluted solution bush 32b into which the undiluted solution water flow tube 32a having a predetermined cross-sectional area and length is fitted into the hole formed in the connecting portion 32d, the undiluted solution bush 32b has a predetermined cross-sectional area and length. The undiluted water flow tube 32a can be installed at the connection portion 32d.

[Structure of Diluted Cell Unit 33]
The dilution cell unit 33 is for mixing the undiluted solution and the diluted solution supplied from the cartridge unit 32, and the first diluted solution receiving unit 33a and the first diluted solution receiving unit 33a arranged substantially horizontally are used. It is composed of a second diluent receiving portion 33b connected to the end portion of 33a and arranged substantially vertically, and a mixing portion 33c.

The first diluent receiving portion 33a is a gutter-shaped flow path arranged in a substantially horizontal direction.

The second diluted liquid receiving portion 33b is formed substantially concentrically with respect to the undiluted water passing tube 32a so as to cover the periphery of the undiluted water passing tube 32a. It is a tube that has been made. Further, the second diluent receiving portion 33b communicates with one end of the first diluent receiving portion 33a.

The lower end of the second diluent receiving portion 33b is arranged so as to be located below the outlet formed at the lower end of the stock solution water flow tube 32a.

The upper ends of the first diluent receiving portion 33a and the second diluent receiving portion 33b are water-sealed by the lower surface (sealing packing) of the connecting portion 32d constituting the cartridge portion 32.

The mixing section 33c is a tubular flow path formed so as to connect to the lower end of the second diluent receiving section 33b, and the undiluted solution supplied from the stock solution water flow tube 32a and the first diluent receiving section. This is a portion where the diluent supplied to the second diluent receiving portion 33b via 33a is mixed.

The mixed solution of the undiluted solution and the diluted solution generated in the mixing section 33c is supplied to the suction pump 70 through the discharge port 34. Further, it is also possible to push the air stored in the upper part of the diluent supply path 31d to the diluent tank 20 by reversing the suction pump 70 for several seconds, and by carrying out such an operation, the inside of the dilution unit 30 It is possible to exhaust the internal air remaining in the.

[Structure of undiluted solution circulation pump 40]
The undiluted solution circulation pump 40 is a pump that sucks the undiluted solution from the undiluted solution tank 10, supplies the undiluted solution to the return pipe unit 50 described later, and supplies a minute undiluted solution to the dilution cell unit 30 while the suction pump 70 is operating. The remaining undiluted solution that is not supplied to the dilution cell unit 30 is returned to the undiluted solution tank 10 via the return pipe unit 50.

That is, the stock solution circulation pump suction port 40i is connected to the discharge port 10g of the stock solution tank 10 via a flow path, and the stock solution circulation pump discharge port 40e is connected to the return pipe inflow portion 52i of the return pipe unit 50. ing.

(Is it okay to delete the description of the invisible part above? Because the limitation here may narrow the scope of rights.)

A tube pump is used as the stock solution circulation pump 40 in the present embodiment. The tube pump is a pump that can suck a predetermined amount of air, and even if air is accumulated in the pump at the beginning of operation, air can be forcibly discharged by the pump operation, so pulsation is suppressed and stable operation is performed. It can be carried out.

[Structure of return pipe unit 50]
The configuration of the return pipe unit 50 will be described with reference to FIG.

The return pipe unit 50 is arranged in a substantially horizontal direction, and has a tubular return liquid storage unit 51 that receives and stores the undiluted liquid discharged from the undiluted liquid circulation pump 40 described later, and an upper portion of the return liquid storage unit 51 on one end side in the horizontal direction. The inflow pipe 52 connected to the return liquid storage portion 51, the connection pipe 53 connected to the lower portion of the return liquid storage portion 51 in the horizontal direction, and the return pipe 54 connected to the lower portion of the return liquid storage portion 51 in the horizontal direction end portion. And.

The return liquid storage unit 51 includes a first return liquid storage unit 51a to which the inflow pipe 52 and the connection pipe 53 are connected, a second return liquid storage unit 51b to which the return pipe 54 is connected, and a first return liquid storage unit 51a. It is composed of a bottom raising portion 51c that separates the second return liquid storage portion 51b from the second return liquid storage portion 51b.

An inflow pipe connecting portion 51d to which the inflow pipe 52 is connected is provided above the first return liquid storage portion 51a, and the undiluted liquid discharged from the undiluted liquid circulation pump 40 flows in from the inflow pipe connecting portion 51d via the inflow pipe 52. do.

Further, the return liquid storage unit 51 includes a connection pipe connection portion 51e to which the connection pipe 53 is connected at the lower part of the first return liquid storage unit 51a, and the undiluted liquid stored in the return liquid storage unit 51 is connected to the connection pipe. It flows out from the portion 51e to the connecting pipe 53. Further, the undiluted solution that flows into the diluted cell unit 30 through the connecting pipe connected to the undiluted solution supply port 31a of the diluted cell unit 30 and is returned to the connecting pipe 53 by the operation of the air bleeding pump 60 described later is the connecting pipe. It flows back from the connection portion 51e to the return liquid storage portion 51.

Further, the return liquid storage unit 51 includes a return pipe connection portion 51f to which the return pipe 54 is connected at the lower part of the second return liquid storage unit 51b, and the stock solution stored in the return liquid storage unit 51 is connected to the return pipe. It flows out from the portion 51f to the return pipe 54.

The return liquid storage unit 51 is provided with an air vent hole 51g that opens the return liquid storage unit 51 to the atmosphere above the second return liquid storage unit 51b, and is contained in the stock solution supplied to the return liquid storage unit 51. The contained air can be discharged.

The return liquid storage portion 51 is formed of a tubular member extending in the horizontal direction, and the undiluted liquid flowing into the tubular member extending in the horizontal direction from the inflow pipe connecting portion 51d is from the height h0 of the reference plane. Is also designed to hold and store the liquid level at a position higher by a predetermined second liquid level height h2. The first return liquid storage section 51a, the second return liquid storage section 51b, and the bottom raising section 51c of the return liquid storage section 51 hold the stock solution at a predetermined second liquid level height h2 higher than the first liquid level h1. It functions as a storage unit that stores the liquid in the state of being stored.

At that time, a bottom raising portion 51c that separates the first return liquid storage portion 51a and the second return liquid storage portion 51b is formed, and the height of the bottom surface of the bottom raising portion 51c is the first return liquid storage portion 51a and the second. It is higher than the height of the bottom surface of the return liquid storage portion 51b. In the present embodiment, the reduced diameter portion of the tubular member is configured as the bottom raising portion 51c.

The inflow pipe 52 has a return pipe inflow portion 52i in which the return liquid flows in from the side at the upper portion, and the inflow pipe of the return liquid storage portion 51 changes its direction substantially vertically downward from the return pipe inflow portion 52i. It is a substantially L-shaped tubular member connected to the connecting portion 51d (note that it does not necessarily have to be substantially L-shaped).

The return pipe inflow portion 52i is connected to the stock solution circulation pump discharge port 40e of the stock solution circulation pump 40 via a flow path.

The connecting pipe 53 is a tubular member arranged in a substantially vertical direction, which has a return liquid inflow / outflow portion 53e through which the return liquid flows in and out downward, and a connection pipe connecting portion 51e of the return liquid storage portion 51 is connected upward. be.

The return liquid inflow / outflow section 53e is connected to the stock solution supply port 31a of the dilution cell unit 30 via a flow path.

The return pipe 54 is a substantially L-shaped tubular member having a circulation discharge port 54e through which the return liquid flows downward and to which the return pipe connection portion 51f of the return liquid storage portion 51 is connected upward (note that it is not always necessary). It does not have to be approximately L-shaped).
The circulation discharge port 54e is connected to the circulation port 10h of the stock solution tank 10 via a flow path.

The return pipe unit 50 is installed so that the height in the vertical direction can be changed, and the flow rate of the stock solution supplied from the return pipe unit 50 to the dilution cell unit 30 can be changed by changing the height in the vertical direction. This makes it possible to change the mixing ratio of the undiluted solution and the diluted solution, that is, the dilution ratio. This point will be described later.

As a mechanism for adjusting the height of the return pipe unit 50, for example, a mechanism for connecting a level adjusting bolt (not shown) and the return pipe unit 50 so as to operate integrally, or a rack and pinion is used. , Well-known means are used.

[Structure of air bleeding pump 60]
The air bleeding pump 60 is a pump for pushing out the air staying in the piping unit 31 of the dilution cell unit 30 and the air staying in the vicinity of the connection pipe 53 of the return pipe unit 50, which will be described later, to the return pipe unit 50 together with the undiluted solution. The bleeding pump discharge port 60e is connected to the air bleeding flow path 31e of the dilution cell unit 30, and the air bleeding pump suction port 60i is connected to the discharge port 10g of the stock solution tank 10 via a pipe. The pipe connecting the air bleeding pump suction port 60i and the discharge port 10g of the stock solution tank 10 and the pipe connecting the stock solution circulation pump suction port 40i and the discharge port 10g of the stock solution tank 10 are pipes. For convenience of, some common ones may be used which are connected to each other on the way.

Further, as will be described in detail later, air bleeding by the air bleeding pump 60 is performed only for a few seconds immediately before the undiluted solution circulation pump 40 operates.

A tube pump is used as the air bleeding pump 60 in this embodiment. The tube pump is a pump capable of sucking and discharging a predetermined amount, and even if air is accumulated in the pump at the initial stage of operation, air can be forcibly discharged by the pump operation, so that pulsation is suppressed and stable. Can perform operations.

[Structure of suction pump 70]
The suction pump 70 is a pump for supplying the mixed liquid generated by the dilution cell unit 30 to the use point, and the suction pump suction port 70i is connected to the discharge port 34 of the dilution cell unit 30 to discharge the suction pump. The outlet 70e is connected to a supply destination (not shown) such as a use point.

As the suction pump 70 in this embodiment, a tube pump is used. The tube pump is a pump that can suck a predetermined amount of air, and even if air is accumulated in the pump at the beginning of operation, air can be forcibly discharged by the pump operation, so pulsation is suppressed and stable operation is performed. It can be carried out.

[Operation of dilution cell unit 30]
Next, the principle that the undiluted solution is diluted with the diluted solution to form a mixed solution will be described using the dilution cell unit 30 configured as described above.

First, it is assumed that the undiluted solution and the diluted solution have already been mixed to form a mixed solution. At this time, the diluent was stored in the diluent supply port 31c, the diluent supply path 31d, the diluent water passage section 32c, the first diluent solution receiving section 33a, and the second diluent solution receiving section 33b. It is in a state. The undiluted solution is stored in the undiluted solution supply port 31a, the undiluted solution supply path 31b, and the undiluted solution water flow tube 32a. Then, the mixing section 33c is filled with a mixed solution in which the undiluted solution and the diluted solution are mixed at a desired ratio. Then, it is connected to the suction pump 70 via the discharge port 34, and the tip of the suction pump 70 is supplied by free fall to a device such as a nebulizer that uses the mixed solution.

In this state, when the mixed liquid is used to some extent by the supply device (for example, the sprayer that sprays the mixed liquid) ahead of the suction pump 70, the lower limit sensor of the liquid agent attached to the device such as the sprayer is activated. A signal prompting the diluter to supply the mixture is output.

In response to the signal, the suction pump 70 operates, and at the same time, the air bleeding pump 60 operates for a predetermined time, and then the stock solution circulation pump 40 operates to supply the mixed liquid stored in the mixing unit 33c before the suction pump 70. At the same time, a new mixed solution is generated.

[Operation when generating a mixed solution]
Next, a mechanism for generating a new mixed liquid with the operation of the suction pump 70 and the stock solution circulation pump 40 will be described.

When the suction pump 70 operates, the diluent stored in the water-passing section 32c for the diluent, the first diluent receiving section 33a, and the second diluent receiving section 33b is sucked, and the diluent is sucked accordingly. The diluent is supplied from the diluent tank 20 via the supply port 31c and the diluent supply path 31d.

At this time, since the diluent is replenished so that the liquid level of the diluent tank 20 is always maintained at a predetermined value, the liquid level of the diluent in the diluent tank 20 is the first liquid level. It is held at h1, and a constant head pressure H1 is always held on the surface of the diluent. When the suction pump 70 operates, the insides of the dilution cell portion 33 and the cartridge portion 32 are sucked by the operation of the suction pump 70 to become a negative pressure, and the diluent is immediately supplied from the diluent tank 20 by gravity. Here, the amount of natural water supply due to gravity from the diluent tank 20 is stably set to be larger than the suction amount of the suction pump 70, and the cartridge near the tip discharge hole of the cartridge part 32a in the dilution cell part 33 is set. Since the internal head pressure of the part 32 is common to the head pressure H1 of the diluted solution and the head pressure H2 of the stock solution, the difference between the head pressure H2 of the stock solution and the head pressure H1 of the diluted solution in the return pipe unit 50 is kept constant. As a result, a stable flow of a predetermined amount of diluent is generated.

Therefore, when the suction pump 70 operates, a constant head pressure H also acts on the tip of the stock solution water flow tube 32a, and the stock solution flows in due to a stable flow of the diluted solution in a predetermined amount. The undiluted solution stored in the undiluted solution water flow tube 32a, the undiluted solution supply path 31b, the undiluted solution supply port 31a, and the return pipe unit 50 is sucked by the head pressure H, and is formed through a hole formed at the tip of the undiluted solution water flow tube 32a. It is supplied to the mixing unit 33c.

That is, before the suction pump 70 is operated, the undiluted solution water flow tube 32a and the undiluted solution supply path 31b of the dilution cell unit 30 are filled with the undiluted solution. Similarly, the air bleeding flow path 31e and the flow path connecting the dilution cell unit 30 and the return pipe unit 50 are also filled with the undiluted solution, and the return liquid storage portion 51 of the return pipe unit 50 is filled with a predetermined second. The undiluted solution is stored (described later) so as to maintain the liquid level height h2, and the suction pump 70 operates to sequentially send out the stored undiluted solution, which is bored at the tip of the undiluted water flow tube 32a. The undiluted solution is supplied from the holes to the mixing section 33c.

Then, at the same time as the suction pump 70 operates, the air bleeding pump 60 operates for a predetermined time, and the stock solution circulation pump 40 operates immediately after the stop, so that the second liquid level height h2 of the return liquid storage unit 51 of the return pipe unit 50 Can be retained. Both the air bleeding pump 60 and the stock solution circulation pump 40 are supplied with the stock solution from the stock solution tank 10.

That is, the undiluted solution circulation pump suction port 40i of the undiluted solution circulation pump 40 is connected to the discharge port 10 g of the undiluted solution tank 10, and as the undiluted solution circulation pump 40 operates, the undiluted solution stored in the undiluted solution tank 10 is discharged 10 g. Is sucked through.

Further, the undiluted solution circulation pump discharge port 40e of the undiluted solution circulation pump 40 is connected to the return pipe inflow portion 52i of the return pipe unit 50, and the undiluted solution sucked from the undiluted solution tank 10 is returned to the return pipe as the undiluted solution circulation pump 40 operates. It is supplied to the return pipe unit 50 via the inflow portion 52i.

In this way, by operating the stock solution circulation pump 40 in accordance with the operation of the suction pump 70, the liquid level of the stock solution stored in the return liquid storage unit 51 of the return pipe unit 50 is set to a predetermined second liquid level height h2. Can be retained.

Therefore, the negative pressure generated by the operation of the suction pump 70 is applied and supplied by the head pressure H1 of the diluent tank 20 and the head pressure H2 of the undiluted solution and is instantaneously eliminated. The difference H is kept constant, and a predetermined amount of stable stock solution can be naturally dropped to generate a flow.

Since the undiluted solution flows out from the undiluted solution tank 10 through the discharge port 10 g and the liquid level in the undiluted solution tank 10 drops, the floating portion 10e descends as described above, and the undiluted solution is replenished through the injection port 10b. The liquid level height of the undiluted solution stored in the undiluted solution tank 10 is always maintained at a predetermined value.

The diluent supplied from the diluent tank 20 to the dilution cell unit 30 passes through the diluent supply port 31c, the diluent supply path 31d, and the diluent water passage section 32c, and passes through the diluent solution receiving section 33a. Is supplied to.

Since the first diluent receiving portion 33a is a gutter-shaped member arranged substantially horizontally, the supplied diluent moves from one end side to the other end side of the first diluent receiving portion 33a, and the other It reaches the second diluent receiving portion 33b which is connected to the end portion. Then, it flows into the second diluted liquid receiving portion 33b, descends the second diluted liquid receiving portion 33b, and reaches the mixing portion 33c located below the second diluted liquid receiving portion 33b.

The undiluted solution supplied from the return pipe unit 50 to the dilution cell unit 30 is supplied to the second diluted solution receiving unit 33b through the undiluted solution supply port 31a, the undiluted solution supply path 31b, and the undiluted solution water flow tube 32a. .. Then, in the second diluent receiving portion 33b, it mixes with the diluent while descending, and reaches the mixing portion 33c located below the second diluent receiving portion 33b.

At this time, in the second diluent receiving portion 33b, only the diluted solution is stored above the outlet formed at the lower end of the water flow tube 32a for the undiluted solution, and below the outlet, the diluted solution and the undiluted solution are stored. Is mixed to produce a mixed solution.

The height at which the return pipe unit 50 is arranged determines the difference in head pressure between the undiluted solution and the diluted solution, thereby determining the mixing ratio of the undiluted solution and the diluted solution. Therefore, a flow rate adjusting device such as a flow rate adjusting valve is used. By changing the height of the return pipe unit 50, a mixed solution having a desired ratio can be produced without using.

Moreover, when the first liquid level height h1 is constant, the head pressure difference H proportional to the second liquid level height h2 can be obtained by changing the second liquid level height h2, and as a result, the head pressure difference H can be obtained. A mixing ratio proportional to the second liquid level height h2 can be obtained.

Further, since the liquid level heights of the diluted water and the stock solution are always maintained at predetermined values, the predetermined head pressure is always stably applied. Since the discharge of the diluted solution and the undiluted solution to the dilution cell portion 33 by applying the head pressure is much larger than the suction amount by the suction pump 70, the difference H of the head pressure can always be maintained at a constant value, and the suction pump can be used. Even if the amount of suction by the suction pump 70 per unit time is small, it is possible to generate a mixed solution in a predetermined ratio without causing pulsation by the suction pump 70.

Further, since the outlet formed at the end of the undiluted water flow tube 32a is formed so as to be inclined with respect to the supply direction of the undiluted solution, eddy currents and the like that are likely to occur in the perpendicular direction at the tip are eliminated, and the second dilution is achieved. The discharge port has a large contact area along the flow of the diluting liquid from the liquid receiving portion 33b, and can be smoothly mixed with the diluting liquid without staying due to a vortex or the like near the outlet of the stock solution.

In this way, in the diluting device according to the present embodiment, even when a mixed liquid having a high magnification and a small amount is produced, suction is performed without using an expensive control device to actively adjust the flow rate. A mixture of a predetermined ratio can be stably produced only by the operation of the pump 70, the return pipe unit 50, the air bleeding pump 60, and the stock solution circulation pump 40.

Then, by changing the arrangement height of the return pipe unit 50, the difference between the water level at which the undiluted solution is stored and the water level at which the diluted solution is stored can be changed, so that the difference in the flow rate can be changed. As a result, a mixed solution having a desired mixing rate, particularly a mixing rate proportional to the second liquid level height h2, can be produced.

Since a mixing ratio proportional to the second liquid level height h2 can be obtained, a desired relationship between the mixing ratio and the second liquid level height h2 can be obtained from the second liquid level height h2. It is possible to obtain a mixed solution having a mixing ratio.

[Operation when bleeding air]
Next, an operation for removing air generated in the middle of the flow path will be described.

As described above, when the suction pump 70 is stopped, the stock solution circulation pump 40 is also stopped at the same time. At that time, the undiluted water flow tube 32a and the undiluted solution supply path 31b of the dilution cell unit 30 are filled with the undiluted solution.

At this time, similarly, it is considered that the flow path connecting the dilution cell unit 30 and the return pipe unit 50 is also filled with the undiluted liquid, but in reality, the return liquid storage portion 51 of the return pipe unit 50 and the return pipe unit 50 No undiluted solution is stored in the vicinity of the return liquid inflow / outflow portion 53e. The cause is that the return liquid storage section 51 and the diluting liquid tank 20 are connected via the undiluted liquid water flow tube 32a, so that when the flow of the liquid inside the diluting cell section 33 is stopped, the equilibrium state is established according to Pascal's principle. The undiluted liquid in the flow path moves to the diluting liquid tank 20 side, the liquid agent disappears in the vicinity of the connecting pipe 53, and the liquid level of the return liquid storage portion 51 becomes the liquid level of the diluting liquid tank 20 ( Although it was higher than the first liquid level h1) by the amount of the head pressure H, the difference in the liquid level gradually became smaller. Then, when the stop time of the suction pump 70 becomes long, the difference H of the head pressure becomes almost zero.

When the undiluted solution circulation pump 40 is operated in this state, surface tension is generated by the inner diameters of the connecting pipe connecting portion 51e and the connecting pipe 53, and a water film is formed by the surface tension, and the air below it (dilution unit 30 side) is formed. This air has a great influence on the amount of the undiluted solution flowing out from the undiluted solution water flow tube 32a, and the accuracy of the dilution concentration is significantly lowered. Here, if the inner diameters of the connecting pipe connecting portion 51e and the connecting pipe 53 are set to a large inner diameter so that a film cannot be formed due to surface tension, a large amount of undiluted solution corresponding to the head h is prepared according to Pascal's principle generated while the suction pump 70 is stopped. The undiluted solution is sent out to the second diluted solution receiving section 33b and the first diluted solution receiving section 33ba where the undiluted solution should not exist, which causes a phenomenon that the mixing error is increased, so that the undiluted solution cannot be adopted.

Therefore, by operating the air bleeding pump 60 for several seconds at the same time as the suction pump 70 operates, the undiluted solution flows back from the undiluted solution supply port 31a toward the connecting pipe 53, and the air staying inside the piping unit 31 and the vicinity of the connecting pipe 53 It was decided to push the air staying in the return liquid storage unit 51 together with the undiluted liquid.

That is, when the air bleeding pump 60 is operated, the undiluted solution in the undiluted solution tank 10 is sucked from the discharge port 10g into the air bleeding pump suction port 60i, and the undiluted solution discharged from the air bleeding pump discharge port 60e flows into the air bleeding flow path 31e. Then, it is discharged from the undiluted solution supply port 31a via the undiluted solution supply path 31b, flows into the connecting pipe 53 through the pipe connecting between the connecting pipe 53 and the undiluted solution supply path 31b, and then returns to the return liquid storage section 51. do. In this series of flows, the air staying inside the piping unit 31 and the air staying in the vicinity of the connecting pipe 53 are pushed out to the return liquid storage section 51 together with the undiluted solution, and the inner diameter of the connecting pipe connecting section 51e is buried in the undiluted solution. Therefore, a stable head pressure H can be obtained without forming a film due to surface tension.

The stock solution containing the air that has flowed into the return pipe unit 50 is separated from the stock solution by the return liquid storage unit 51. That is, in the return liquid storage unit 51, the undiluted liquid is stored so as to maintain a predetermined second liquid level height h2, so that the return liquid storage unit 51 is located in a part where the undiluted liquid is stored and a part where gas exists. Divided. Since the air contained in the undiluted solution has a lighter specific gravity than the undiluted solution, it moves upward in the return liquid storage section 51 to reach the liquid surface and is separated from the undiluted solution.

Further, since the large air vent hole 51g that is open to the atmosphere is provided in the upper part of the return liquid storage unit 51, the pressure in the return liquid storage unit 51 is maintained at atmospheric pressure. Therefore, the air in the undiluted solution is smoothly released into the atmosphere from the liquid surface of the undiluted solution without staying in the undiluted solution.

That is, by operating the stock solution circulation pump 40 immediately after the air bleeding pump 60 is stopped, the air bleeding flow path 31e of the dilution cell unit 30, the air bleeding pump 60, the stock solution circulation pump 40, the inflow pipe 52 of the return pipe unit 50, A circulation flow path called a return liquid storage section 51, a connection pipe 53, and a stock solution supply path 31b of the dilution cell unit 30 is formed. When the undiluted solution circulates in this circulation flow path with the operation of the air bleeding pump 60 and the undiluted solution circulation pump 40 and reaches the return liquid storage section 51, the air contained in the undiluted solution is separated from the undiluted solution and the return solution storage section is used. Since the air is discharged from the air bleeding hole 51 g of 51, there is no air remaining in the stock solution flowing into the dilution cell unit 30 side. That is, if there is an air pool inside the diluted cell unit 30 and in the supply path of the undiluted solution and the diluted solution to the diluted cell unit 30, the water supply method is a natural water drop method with a slight head pressure due to the structure of each device, so the air pool It is necessary to eliminate the change in each waterfall due to the internal pressure of the water, which increases the error of the dilution concentration.

When the undiluted solution circulates, a part of the undiluted solution supplied to the return liquid storage section 51 is subjected to the dilution cell unit 30 from the undiluted solution supply port 31a via the return liquid inflow / outflow section 53e of the connecting pipe 53 after the operation of the air bleeding pump 60. However, the remaining undiluted solution passes over the bottom raising portion 51c, flows into the second return liquid storage section 51b, flows out from the return pipe connection section 51f, and flows into the undiluted solution tank 10 via the return pipe 54 and the circulation port 10h. And recirculated.

In this way, the air bleeding pump 60 can also be operated by forming a route for circulating the undiluted solution from the dilution cell unit 30 to the return liquid storage section 51 of the return pipe unit 50. As a result, the air in the undiluted solution, which hinders the achievement of a highly accurate mixing ratio, can be separated from the undiluted solution, and even when a high-magnification and small amount of mixed solution is produced, the accuracy is not affected by the air. A high dilution rate can be achieved.

[Replacement of the water flow tube in the cartridge section 32]
Next, replacement of the water flow tube in the cartridge unit 32 will be described.

As described above, in the cartridge portion 32, the undiluted water flow tube 32a into which the undiluted water flow tube 32a is fitted is fitted into the hole formed in the connection portion 32d, so that the undiluted water flow tube 32a is connected to the connection portion 32d. Will be installed in.

Due to such a configuration, the stock solution bush 32b into which the stock solution water flow tube 32a having a predetermined cross-sectional area and length is fitted, and the stock solution water flow tube 32a having a different cross-sectional area and / or length are used. By replacing with the fitted undiluted solution bush 32b, it becomes possible to supply undiluted solutions at different flow rates.

Such replacement may be performed by using the undiluted solution bush 32b into which the undiluted solution water flow tube 32a is fitted as one unit. Alternatively, the stock solution bush 32b may be left fitted in the connecting portion 32d, and only the stock solution water flow tube 32a may be replaced.

In this way, by replacing the stock solution water flow tube 32a having a predetermined cross-sectional area and length with a stock solution water flow tube 32a having a different cross-sectional area and / or length, the stock solution or dilution of a different flow rate is performed. It becomes possible to supply the liquid. Therefore, by using the undiluted water flow tube 32a having a predetermined cross-sectional area and / or length, it is possible to generate a mixed solution having a desired ratio.

As described above, in the diluting liquid tank 20 and the return pipe unit 50, since the liquid level heights of the diluted water and the undiluted liquid are always maintained at predetermined values, the predetermined head pressure is always stably applied and suction is performed. Since the amount of natural water falling from the diluent tank 20 is set to be larger than the amount of suction by the pump 70, the suction pressure by the suction pump 70 does not act on the head pressure H, and the liquid amount supply by the head pressure is not affected. Even if the suction amount per unit time by the suction pump 70 is small, it is possible to generate a mixed liquid in a predetermined ratio without causing pulsation by the suction pump 70.

Further, the height at which the return pipe unit 50 is arranged determines the difference in head pressure between the undiluted solution and the diluted solution, which determines the ratio at which the undiluted solution and the diluted solution are mixed. Therefore, a flow rate adjusting device such as a flow rate adjusting valve. By changing the height of the return pipe unit 50, a mixed solution having a desired ratio can be produced without using.

Further, the return liquid storage section 51 is divided into a side connected to the stock solution supply path (first return liquid storage section 51a) and a side connected to the stock solution tank (second return liquid storage section 51b) by the bottom raising section 51c. Since they are separated, the excess undiluted solution can pass over the bottom raising portion 51c and return to the undiluted solution tank 10, and the liquid level height can be maintained at a predetermined second liquid level height h2. At that time, since the inflow pipe 52 and the connecting pipe 53 are located on the same side (first return liquid storage portion 51a) in the horizontal direction, it is possible to prevent the undiluted solution from being returned to the undiluted solution tank 10 more than necessary. ..

Further, since the return liquid storage unit 51 has an air vent hole 51 g that communicates with the atmosphere, the pressure in the return liquid storage unit 51 is maintained at atmospheric pressure. Therefore, the air in the undiluted solution is smoothly released into the atmosphere from the liquid surface of the undiluted solution without staying in the undiluted solution.

Further, since the outlet end of the stock solution water flow tube 32a forms an inclined end face, the contact area between the outlet and the diluent is increased, and stable discharge is possible by preventing the generation of eddy currents and the like.

Further, since the outlet end of the undiluted water flow tube 32a is further rounded, it is possible to prevent injuries during assembly or replacement of the undiluted water flow tube.

In addition, by using an injection needle whose cross-sectional area, tip inclination, and length are determined by the gauge (model number) used, dilution that can be easily constructed using commercially available articles that are easily available. Equipment can be provided.

Further, by using the diluting device of the present invention, it is possible to provide a spraying device capable of spraying a mixed solution adjusted to a desired concentration from a sprayer.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments described above. In addition, the effects described in the embodiments of the present invention merely list the most preferable effects arising from the present invention, and the effects according to the present invention are limited to those described in the embodiments of the present invention. is not it.

Further, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations.

The diluting device of the present invention can be applied to various devices that dilute various liquids with another liquid.

1 Diluting device 10 Undiluted solution tank 10g Discharge port 10h Circulation port 20 Diluting solution tank 30 Diluting cell unit 31 Piping unit 31a Undiluted solution supply port 31b Undiluted solution supply port 31c Diluting solution supply port 31d Diluting solution supply path 31e Air bleeding flow path 32 Cartridge section 32a Undiluted solution water flow tube 32b Undiluted solution bush 32c Diluted solution water flow section 32d Connection section 33 Diluting cell section 33a First diluted solution receiving section 33b Second diluted solution receiving section 33c Mixing section 34 Discharge port 40 Undiluted solution circulation pump 40i Undiluted solution circulation pump suction port 40e Undiluted solution circulation pump discharge port 50 Return pipe unit 51 Return liquid storage part 51a First return liquid storage part 51b Second return liquid storage part 51c Bottom raising part 51d Inflow pipe connection part 51e Connection pipe connection part 51f Return pipe Connection part 51g Air bleeding hole 52 Inflow pipe 53 Connection pipe 54 Return pipe 60 Air bleeding pump 60i Air bleeding pump suction port 60e Air bleeding pump Discharge port 70 Suction pump

Claims (8)

A stock solution tank that stores the stock solution and
A diluent tank that stores the diluent while maintaining a predetermined first liquid level, and
A stock solution circulation pump that sucks the stock solution stored in the stock solution tank,
A return pipe unit having a storage unit that receives the undiluted solution discharged from the undiluted solution circulation pump and stores the undiluted solution in a state of holding a predetermined second liquid level height higher than the first liquid level.
A dilution cell arranged below the diluent tank and provided with a mixing section that produces a mixture by mixing the diluent supplied by gravity from the diluent tank with the stock solution supplied by gravity from the reservoir. With the unit
A diluting device arranged on the downstream side of the dilution cell unit and provided with a suction pump for sucking the mixed solution produced by the dilution cell unit.
The return pipe unit is arranged so that the installation height can be changed, and the return pipe unit is arranged so that the installation height can be changed.
The mixing ratio of the undiluted solution and the diluted solution can be changed by changing the installation height of the return pipe unit.
Diluter. The dilution cell unit has a stock solution supply port into which the stock solution supplied from the storage unit flows, and has a stock solution supply path for supplying the inflowing stock solution to the mixing unit, and an air bleeder connected in the middle of the stock solution supply path. Equipped with a flow path,
The diluting device further includes an air bleeding pump that sucks the stock solution from the stock solution tank and sends it to the air bleeding flow path.
The undiluted solution stored in the undiluted solution supply path is discharged from the undiluted solution supply port through the undiluted solution tank, the air bleeding pump, and the air bleeding flow path, and is configured to be able to return to the storage section.
The diluting device according to claim 1. The storage portion is composed of tubular members arranged in the horizontal direction.
The return pipe unit is
An inflow pipe connected to the upper part on one end side in the horizontal direction of the storage unit, which receives the undiluted solution discharged from the undiluted solution circulation pump and supplies the undiluted solution to the storage unit.
A connecting pipe connected to the lower part on one end side in the horizontal direction of the storage unit and connecting between the storage unit and the stock solution supply path.
A return pipe connected to the lower part on the other end side in the horizontal direction of the storage unit and returning a part of the undiluted solution flowing into the storage unit to the undiluted solution tank.
The storage portion is separated from the side to which the connection pipe is connected and the side to which the return pipe is connected, and further includes a bottom raising portion in which the height of the bottom surface is set higher than other portions in the storage portion. ,
The diluting device according to claim 2. The storage unit provides an air vent hole for communicating the inside of the storage unit with the atmosphere.
The diluting device according to claim 2 or 3. The diluted cell unit is
A water flow tube for undiluted solution having a predetermined cross-sectional area and length for supplying the undiluted solution to the mixing portion,
It has a water passage part for the diluent that supplies the diluent to the mixing part.
The outlet end of the undiluted water flow tube forms an inclined end face,
The diluting device according to any one of claims 1 to 4. The outlet end of the undiluted water flow tube is further rounded.
The diluting device according to any one of claims 1 to 5. Use an injection needle as a water flow tube for undiluted solution,
The diluting device according to claim 6. The diluting device according to any one of claims 1 to 7.
A nebulizer for spraying the mixed solution sucked by the suction pump is provided.
Sprayer.

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