JP2022114605A - Liquid container, liquid sterilization system, and liquid preservation method - Google Patents

Abstract

To provide a liquid container, a liquid sterilization system, and a liquid preservation method capable of efficiently maintaining a sterilized liquid.SOLUTION: A water sterilization system 10 comprises: a UV device 12; and a tank 15. Water is caused to flow out through a pipe line 11 connected to the bottom part of a body 15a of the tank 15 and supplied to the UV device 12. In the tank 15, the water sterilized at the UV device 12 is supplied and stored. An inlet pipe 16 connected to a pipe line 13 through which the water from the UV device 12 is supplied is provided above the water surface W1 of the body 15a of the tank 15. The water is sprayed downward from the peripheral edge of a disc 17 provided at the lower end of the inlet pipe 16.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a liquid container for storing sterilized liquid such as water used in pharmaceuticals and medicines, a liquid sterilization system using the same, and a liquid storage method.

BACKGROUND ART When preserving water to be used for medical treatment or pharmaceuticals, heat sterilization is performed to prevent the growth of bacteria in the water (see, for example, Patent Document 1). In the method for producing purified water for pharmaceuticals disclosed in this document, unheated raw water is passed through a reverse osmosis membrane device and an electrically regenerated pure water production device, and the treated water is temporarily stored as treated raw water. Then, the treated raw water is heated and circulated to be sterilized, and after sterilization, the raw water is passed through a reverse osmosis membrane device and an electrically regenerated pure water production device to produce purified water.

JP-A-2004-74109

By the way, heat-sterilized water is stored at a high temperature in order to suppress the growth of bacteria in the water. Then, the stored water is cooled to normal temperature and used. For this reason, the storage and use of the product have been troublesome and economically burdensome.

A liquid container for solving the above problems comprises an inflow portion into which liquid sterilized by a sterilization device is introduced, a main body portion in which the liquid supplied by the inflow portion is stored, and a liquid stored in the main body portion that is transferred to the sterilization device. and a turbidity suppression part that suppresses turbidity between the liquid that has flowed in from the inflow part and the liquid that has been stored in the main body.

Further, a liquid sterilization system for solving the above problems comprises: the liquid container according to any one of claims 1 to 4; the sterilization device for sterilizing the liquid stored in the liquid container; A sterilization target liquid supply path for supplying the liquid to the sterilization device, and a sterilized liquid supply path for supplying the liquid sterilized by the sterilization device to the liquid container.

Furthermore, a liquid storage method for solving the above problems is provided by supplying and storing a liquid sterilized by a sterilization device, using a liquid container for discharging the stored liquid to the sterilization device, the sterilized liquid The liquid is supplied and stored in a state in which turbidity between the liquid sterilized by the sterilization device and the liquid stored in the liquid container is suppressed.

According to the present invention, sterilized liquid can be efficiently maintained.

The block diagram of the liquid sterilization system of embodiment. A graph showing the decrease in the number of bacteria according to the elapsed time in the embodiment. The block diagram of the liquid sterilization system of the 1st modification. The block diagram of the liquid sterilization system of the 2nd modification.

An embodiment embodying a liquid container, a liquid sterilization system, and a liquid storage method will be described below with reference to FIG. The liquid sterilization system of the present embodiment will be described as a water sterilization system that sterilizes water used for pharmaceuticals as a liquid.

As shown in FIG. 1, the water sterilization system 10 includes a UV device 12 for sterilizing water and a tank 15 for storing the sterilized water. The tank 15 and UV device 12 are connected via conduits 11 and 13 . The water stored in the tank 15 is supplied to the UV device 12 through the pipeline 11 as a sterilization target liquid supply route. A pump P1, a valve V1, a flow meter F1, and a valve V2 are provided in series from the tank 15 side to the pipeline 11 . Between the valve V1 and the flow meter F1 in the pipe line 11, a replenishing pipe (not shown) of treated raw water obtained by filtering or sterilizing raw water is connected in order to replenish the sterilized water. .

Water sterilized by the UV device 12 is supplied to the tank 15 via the pipeline 13 . This pipeline 13 is a sterilized liquid supply path, and is provided with a valve V3. Further, a branch line 14 is provided on the upstream side of the valve V3 of the line 13 . This branch pipeline 14 is a pipeline for using sterilized water, and the branch pipeline 14 is provided with a valve V4.
The UV device 12 is a sterilization device that sterilizes water passing through it by irradiating it with ultraviolet rays.

Controller C1 is connected to pump P1, flow meter F1 and valves V1, V2, V3 and V4. The control device C1 adjusts the amount of water supplied to the UV device 12 by controlling the opening and closing of the valves V1 and V2 and the adjustment of the discharge amount of the pump P1 according to the flow rate measured by the flowmeter F1. Furthermore, the control device C1 determines the supply destination of the sterilized water in the UV device 12 by controlling the opening and closing of the valves V3 and V4.

(Tank structure)
Next, the structure of the tank 15 used in the water disinfection system 10 of this embodiment will be described.
The tank 15 includes a body portion 15a that is a cylindrical container. An end portion of the conduit 13 is provided at the upper end portion of the body portion 15a. Further, an inflow pipe 16 as an inflow portion is arranged on the upper portion of the main body portion 15a. This inflow pipe 16 is connected to the pipeline 13 . The inflow pipe 16 has a disc portion 17 as a turbidity suppressing portion provided at the bottom. The disk portion 17 is a spraying device that spreads and sprays water in the plane, and has a hollow portion that spreads horizontally. A plurality of holes serving as ejection ports are formed in the bottom of the disc portion 17 . Then, water drops downward in the form of mist through these plurality of holes and is sprinkled (sprayed) on the water surface W1.
The pipe line 11 is connected to the lowermost bottom surface of the body portion 15a to form a discharge portion.

(Sterilization method)
Next, a sterilization method of the water sterilization system 10 described above will be described.
The controller C1 drives the pump P1 and opens the valves V1 and V2 while measuring the flow rate with the flowmeter F1. As a result, the water stored in the body portion 15 a is supplied to the UV device 12 through the pipeline 11 . In this case, since the pipe line 11 is connected to the bottom surface of the body portion 15a, the water positioned below the body portion 15a is supplied to the UV device 12. FIG. This water is water that has been sterilized for some time.

Then, the control device C1 opens the valve V3 to supply the water sterilized in the UV device 12 to the tank 15 via the conduit 13 . In this case, the water supplied to the tank 15 through the pipe line 13 gently falls on the surface of the water (water surface W1) stored in the main body 15a through the disk portion 17 of the inflow pipe 16. , and flows into the main body 15a of the tank 15 without roughening the water surface W1. Since water is supplied from above into the main body 15a, water that has been sterilized for a short time is accumulated above. Then, the water accumulated in the bottom of the main body 15a of the tank 15 is supplied to the UV device 12 in order from the water that has been sterilized for some time.
If water is to be used, the controller C1 closes valve V3 and opens valve V4 to supply freshly sterilized water from UV device 12 via branch line 14. FIG.

FIG. 2 compares the sterilization effect when the turbidity of the sterilized water and the water accumulated in the tank 15 is suppressed and when it is not suppressed (completely mixed with the water accumulated in the tank 15). For the sake of clarity, the water accumulated in tank 15 was water containing bacteria. As common conditions, the capacity of the tank 15 was 1000 liters (L), the processing capacity of the UV device 12 was 17 L/min, and the initial bacterial concentration of the water in the tank 15 was 100 cfu/L. A solid line in FIG. 2 indicates a state in which turbidity is suppressed by supplying water near the water surface W1, like the tank 15 of the present embodiment. In this case, as shown in this figure, 100,000 bacteria present in the tank are reduced to almost "0" in 60 minutes (predetermined time) when turbidity is suppressed.

(Action)
In the tank 15 of the water sterilization system 10, the disc portion 17 spreads and sprays the injected sterilizing water in the plane. As a result, the sterilizing water is not concentrated in one place and pours down on the water surface W1 without unnecessarily disturbing it. Therefore, water immediately after sterilization and water after sterilization for a long time are not turbid.

According to this embodiment, the following effects can be obtained.
(1) In this embodiment, in the tank 15, the water sterilized by the UV device 12 is quietly supplied to the surface W1 of the stored water while suppressing turbidity. As a result, water that has just been sterilized and water that has been sterilized for a long time are stored in the main body 15a of the tank 15 without turbidity. Since the water to be supplied to the UV device 12 is discharged from the bottom surface of the main body 15a of the tank 15, the water in which bacteria have increased over time after sterilization is preferentially supplied to the UV device 12. - 特許庁Therefore, in the water stored in the tank 15, it is possible to efficiently sterilize the water after sterilization for a long time.

(2) In the present embodiment, in the tank 15, the supplied water is sprayed above the water surface W1 of the stored water. As a result, in the tank 15, it is possible to realize a configuration in which water that has just been sterilized and water that has been sterilized for a long time are not mixed.

(3) In this embodiment, the water sterilized by the UV device 12 is stored in the tank 15 . This eliminates the need for cooling as compared to heat sterilization, and allows the normal temperature water to be quickly supplied.

This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- In the water sterilization system 10 of the said embodiment, in the tank 15, the water sterilized was supplied from the hole of the disk part 17 provided above the main-body part 15a. In this case, it is preferable to maintain a constant distance between the discharge port of the disk portion 17 and the water surface W1. For example, a detection unit for detecting the height (water level) of the water surface W1 is provided in the tank 15, and water level information is supplied to the control device C1. The control device C1 adjusts the amount of treated raw water supplied from the supply pipe to the pipe line 11 so as to keep the water level constant.
Alternatively, a moving mechanism may be provided to change the position (height) of the disc portion 17 according to detection of the water level so that the distance between the disc portion 17 and the water surface W1 is constant.

- In the tank 15 of the water sterilization system 10 of the above embodiment, by spraying the supplied water above the water surface W1, turbidity between the newly supplied water and the water in the tank 15 is suppressed. The method of suppressing turbidity is not limited to spraying.

For example, as shown in FIG. 3, the water sterilization system 20 may include a tank 25 configured so that the supplied water runs down the inner surface of the wall. Specifically, an inflow pipe 26 connected to the pipe line 13 is arranged on the upper portion of the body portion 25 a of the tank 25 . At the lower end of the inflow pipe 26, a diffusing section 27 is provided as a turbidity suppressing section, the end of which abuts against the inner surface of the wall of the body section 25a. As a result, the water sterilized in the UV device 12 diffuses down the inner surface of the wall of the body portion 25a through the pipe 13 and the diffusion portion 27 of the inflow pipe 26 of the body portion 25a, and is stored. It reaches the water surface W1 of the water being covered. A conduit 11 connected to the UV device 12 is provided at the bottom of the main body 25a of the tank 25. As shown in FIG. In this case, in order to suppress the turbidity of the water in the body portion 25a of the tank 25, when the flow velocity of the water flowing down along the inner surface of the wall of the body portion 25a is to be slowed down, the valve V3 of the pipe line 13 is opened. It is preferred to adjust the valve state.

- In the tank 15 of the above-described embodiment, the disk portion 17 for supplying the water flowing from the inflow pipe 16 to the water surface W1 is provided as the turbidity suppressing portion. The turbidity suppressing part for suppressing turbidity between the sterilized water newly supplied to the tank 15 and the water already stored in the tank 15 supplies the inflowing water to the water surface W1 so as not to be turbid. is not limited to For example, a turbidity suppressing portion that suppresses turbidity is provided by forming a channel with a longer distance from a portion where the water supplied to the tank 15 is integrated with the stored water to the discharge portion of the tank 15. may be provided.

For example, as shown in FIG. 4, the water disinfection system 30 may have a tank 35 with a long path. In the main body portion 35a of the tank 35, a plurality of pipes are formed so that a long path is defined from the water supplied to the water surface W1 to the discharge port of the inflow pipe 36 to which the pipe line 11 is connected to the bottom surface of the main body portion 35a. partition plates 38 are provided alternately up and down. The partition plate 38 is a partition material that forms a communicating portion that communicates with the upper surface and the lower surface. By passing through the partition plate 38 in the tank 35, the flow path through which the water passes is lengthened. As a result, freshly sterilized water supplied from the UV device 12 is far from the discharge part to which the pipe line 11 is connected, so that the discharged water is less likely to become turbid.

In addition, a plurality of partition plates and pipelines may be arranged in the vertical direction in the tank, and a plurality of flow paths may be provided from the inflow side to the discharge side. Even in this case, since the channel is longer than the width of the channel, turbidity between the liquid supplied to the tank immediately after sterilization and the liquid near the discharge portion of the tank can be suppressed. If at least one partition member is provided in the tank, it is possible to form an elongated flow path through which the liquid that has flowed in from the inflow portion flows out from the discharge portion in the tank, and turbidity can be suppressed.

- In the above embodiment, the water stored in the tank 15 was sterilized using the UV device 12 . The device for sterilizing the liquid stored in the tank is not limited to the UV device, and for example, a device using heat sterilization can also be used.

- In the above embodiment, water is used as the liquid stored in the tank 15 . The liquid stored in the tank 15 is not limited to water as long as it is stored in a sterilized state.

C1... control device, F1... flow meter, P1... pump, V1, V2, V3, V4... valve, W1... water surface, 10, 20, 30... water sterilization system as a liquid sterilization system, 11... sterilization target liquid supply path 13...Pipe line as a sterilized liquid supply route, 12...UV device as a sterilizer, 14...Branch pipe lines, 15, 25, 35...Tanks as liquid containers, 15a, 25a, 35a... Main body 16, 26 Inflow pipe as inflow part 17 Disk part 27 Diffusion part 38 Partition plate.

Claims (6)

an inflow part into which the liquid sterilized by the sterilizer flows;
a body portion for storing the liquid supplied by the inflow portion;
a discharge unit for discharging the liquid stored in the main body to the sterilization device;
A liquid container, comprising: a turbidity suppressing portion that suppresses turbidity between the liquid that has flowed in from the inflow portion and the liquid that is stored in the main body. The turbidity suppressing part is arranged above the liquid surface of the liquid stored in the main body part, and sprays the liquid flowing in from the inflow part toward the liquid surface while suppressing the turbidity. A liquid container according to claim 1. 2. The liquid container according to claim 1, wherein the turbidity suppressing portion spreads the liquid down the inner surface of the main body. 1 to 4, wherein the turbidity suppressing portion includes a partition member forming a flow path inside the main body portion for the liquid, which has flowed in from the inflow portion, to flow out from the discharge portion. 4. The liquid container according to any one of 3. a liquid container according to any one of claims 1 to 4;
the sterilization device for sterilizing the liquid stored in the liquid container;
a sterilization target liquid supply path that supplies the liquid from the liquid container to the sterilization device;
A liquid sterilization system, comprising: a sterilized liquid supply path for supplying the liquid sterilized in the sterilization device to the liquid container. A liquid storage method for supplying and storing a liquid sterilized by a sterilization device and storing the sterilized liquid using a liquid container for discharging the stored liquid to the sterilization device,
A liquid storage method, wherein the liquid is supplied and stored in a state in which turbidity between the liquid sterilized by the sterilization device and the liquid stored in the liquid container is suppressed.

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