JP2018171580A - Tank inside cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank inside cleaning device which has a simple structure, prevents cross contamination by securely positioning a cleaning liquid jetting member above a liquid level of waste liquid, and can thoroughly clean an inside of a waste liquid tank.SOLUTION: A cleaning device includes guide members 22 arranged at an inside of a waste liquid tank 12, and a cleaning unit 24 slidably attached to the guide members 22. The cleaning unit 24 includes a float 38 floating on waste liquid 14, and a spray ball 32 as a cleaning liquid jetting member for jetting cleaning liquid. A flexible tube 34 for supplying the cleaning liquid is connected to the spray ball 32. A plurality of guide members 22 are positioned parallel to each other in a vertical direction. Upper end parts are attached to a lid part 18 of the waste liquid tank 12, and lower end parts are positioned in the vicinity of a middle of a depth of the waste liquid tank 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-tank cleaning device that is provided in a waste liquid tank and performs stationary cleaning.

  2. Description of the Related Art Conventionally, a waste liquid tank that stores waste liquid discharged in the manufacturing process of pharmaceuticals and the like has been washed after draining. In particular, pharmaceuticals that act strongly on the body are dangerous papers that are dangerously poisonous, and can be used with peace of mind in the manufacture of pharmaceuticals, ensuring thorough safety, effectiveness, and quality to ensure that the expected efficacy is obtained. Management is required. In order to realize this, GMP (Good Manufacturing Practice) is stipulated as a legal requirement that should be followed by a medical property collection. Maintenance such as the treatment of the waste liquid extracted from the waste liquid tank and the internal cleaning of the waste liquid tank must also be well managed. Conventionally, various apparatuses have been disclosed for cleaning the inside of such a waste liquid tank.

  In the tank cleaning system disclosed in Patent Document 1, a fixed spray ball and a sensor are provided on the inner surface of the tank. This is because cleaning liquid is sprayed from the spray ball and hits the inner surface of the tank for cleaning, and the cleaning is correctly performed by detecting and recording that the cleaning liquid is normally sprayed from the spray ball. Is to verify.

  Moreover, the high-purity chemical | medical agent washing | cleaning method and high-purity chemical | medical agent sharing apparatus currently disclosed by patent document 2 wash | clean the container which stores a high purity chemical | medical agent, and were joined to the container main body and the container main body. A lid and a cleaning liquid ejecting means are provided. The cleaning liquid ejecting means is a fixed type and performs cleaning by spraying the cleaning liquid onto the inner surfaces of the container body and the lid. 90% or more of the cleaning liquid is sprayed toward the upper half of the inner surface of the lid and the container body. Thereby, since the washing | cleaning liquid which hit the upper half of the internal surface of the container main body flows down to the lower half as it is, it becomes possible to wash | clean more efficiently.

  In Patent Document 1 and Patent Document 2, a cleaning liquid injection means such as a spray ball is fixed at a position above the tank so as not to be submerged when the liquid is full. As a characteristic of the spraying means for spraying, even if droplets are uniformly ejected at 360 degrees, the spatial density of the droplets becomes sparse when the cleaning surface is separated from the spraying means because the small spraying means reaches the cleaning surface of a large area. Thus, a portion where the droplets are difficult to hit uniformly occurs. Therefore, for cleaning, it is ideal to install in the center of the tank because of the spatial distribution of the density of the droplets, but if the waste liquid is filled and submerged, the contaminated liquid cross-connects to the cleaning water side, causing cross contamination. Will occur. In order to prevent the cross contamination, the cleaning liquid spraying means such as a spray ball is located in the upper part of the tank, but there is a possibility that uniform cleaning cannot be performed because the distance of the cleaning surface from the spraying means is not uniform. Accordingly, a movable liquid jetting means such as a spray ball is disclosed. In this structure, the cleaning liquid spraying means such as a spray ball is retracted to the upper part of the tank when it is full, and is lowered to the center of the container when the liquid is drained to prevent cross contamination and clean the inside of the tank uniformly. .

  For example, in the tank cleaning system disclosed in Patent Document 3, a cleaning liquid supply pipe having a nozzle for discharging a cleaning liquid is connected to a driving device such as an air cylinder, and a cleaning liquid discharging nozzle such as a spray ball is used in a cleaning process. The height can be changed arbitrarily. When fixed at a high position as before, the cleaning liquid cannot reach and cannot be washed, so that the portion that has been manually washed can be automatically washed.

  The storage tank cleaning device disclosed in Patent Document 4 has a spray device inserted from above along the vertical axis of the tank, and the cleaning liquid from the spray nozzle is horizontally directed to the tank inner wall surface at 360 °. Inject and wash away contaminants adhering to the wall. A liquid level gauge is provided in the tank, and the spray nozzle is gradually moved downward along the vertical axis by the lifting means based on the signal from the liquid level gauge to automatically remove the entire contaminant on the inner wall surface of the tank. To wash.

  The storage tank cleaning method and apparatus disclosed in Patent Document 5 is used for a radioactive waste liquid storage tank, and a radiation survey meter is arranged in the storage tank cleaning apparatus disclosed in Patent Document 4. Is. A radiation survey meter is placed on the wall surface of the storage tank, the operation pattern of the spray device is selected according to the contamination value of the tank inner wall surface obtained by analyzing the dose equivalent rate data on the tank wall surface after wastewater drainage, Decontamination is performed.

JP-A-8-192125 JP 2004-89865 A Japanese Patent Laid-Open No. 9-248537 Noto 3042389 gazette Japanese Patent No. 2997657

  In the case of the above-described background art, in Patent Documents 1 and 2, since the position of the spray nozzle such as a spray ball is fixed and is provided above so as not to contact the liquid surface, there is a possibility that the cleaning is not sufficient. Even if it is sprayed 360 ° with a spray ball, the inside of the tank cannot be cleaned uniformly, and the cleaning liquid becomes sparse as the waste liquid tends to remain.

  Further, Patent Documents 3 to 5 require a driving device such as an air cylinder in order to raise and lower the position of an injection device such as a spray ball, and the structure is complicated, and electric power is required. Furthermore, even if the relationship between the liquid level and the drive for raising and lowering the ejection position is controlled, there is a possibility that a processing failure may occur in the control signal, and the certainty that the liquid will not be submerged, that is, not cross-contaminated is poor. Normally, there is no control for raising and lowering the injection position, and the drive device operates up and down regardless of the liquid level. Therefore, it is necessary to clean the tank after draining the waste liquid completely. It takes a long time and the work efficiency is not good.

  The present invention has been made in view of the above-mentioned problems of the background art. With a simple structure, the cleaning liquid ejecting member is surely positioned above the liquid level of the waste liquid to prevent cross contamination and clean the inside of the waste liquid tank. An object of the present invention is to provide an in-tank cleaning apparatus that can perform cleaning.

  The present invention is provided with a guide member provided inside a waste liquid tank, and a cleaning unit that is slidably attached to the guide member. The cleaning unit includes a float that floats on the waste liquid, and a cleaning liquid injection that injects the cleaning liquid. The tank cleaning apparatus is provided with a member, and a flexible tube for supplying the cleaning liquid is connected to the cleaning liquid ejecting member.

  Further, the guide member is a rod body, and a plurality of the guide members are provided in parallel to each other in a substantially vertical direction, the upper end portion is attached to the lid portion of the waste liquid tank, and the lower end portion is approximately in the middle of the depth of the waste liquid tank. Has reached. A plurality of floats may be provided.

  Two guide members are provided in parallel to each other, and the cleaning unit connects the two ring portions to two ring portions that are slidably inserted in the guide member. An annular connection member and an attachment member provided in the middle of the annular connection member are provided, and the three floats and the cleaning liquid ejecting member are attached to the attachment member. The cleaning liquid ejecting member is a spray ball.

  The guide member is a hollow tube member, and an end portion of the tube opposite to the cleaning liquid ejecting member is inserted into a hollow inner space of the guide member and pulled out of the waste liquid tank to send the cleaning liquid. Connected to a pressurized water pump.

  The in-tank cleaning apparatus of the present invention has a simple structure, and the cleaning liquid ejecting member is surely positioned above the liquid level of the waste liquid to prevent cross contamination and clean the inside of the waste liquid tank. Since the float floats on the liquid surface and automatically moves up and down with the displacement of the liquid surface, no electric power is required and no cost is required. Further, since the cleaning liquid ejecting member is automatically positioned at the center of the tank when the waste liquid in the tank is drained, the cleaning of the tank inner surface can be made uniform. It is unnecessary for the worker to enter the waste liquid tank, so that the labor of the worker can be reduced and contact with the waste liquid can be avoided.

1 is a schematic view of a tank cleaning apparatus according to an embodiment of the present invention. It is the schematic which shows the state with much storage amount of the waste liquid of the tank cleaning apparatus of one Embodiment of this invention. It is the schematic which shows the state with little storage amount of the waste liquid of the tank cleaning apparatus of one Embodiment of this invention. It is a top view of the washing | cleaning unit of the tank cleaning apparatus of this embodiment. It is a front view of the washing | cleaning unit of the tank cleaning apparatus of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of the present invention. An in-tank cleaning apparatus 10 of this embodiment is attached to a waste liquid tank 12 and cleans a container 16 of the waste liquid tank 12. First, the waste liquid tank 12 will be described. The waste liquid tank 12 is provided with a container 16 for storing the waste liquid 14, and the container 16 is provided with an opening 16a on the upper side. A lid 18 is attached to the opening 16a and closed. An inflow pipe 20 through which waste liquid flows is attached to the lid portion 18, and an end portion of the inflow pipe 20 located inside the container 16 is an inflow port 20 a, reaching the vicinity of the bottom 16 b of the container 16. Yes. The waste liquid tank 12 is an open tank through which air above and below the liquid surface enters and exits. Although not shown, the lid 18 has a vent pipe with a high-performance filter, and air can freely enter and exit, but liquid droplets and minute solids enter and exit. It is supposed not to.

  The in-tank cleaning device 10 is provided with a guide member 22 that is inserted inside the container 16 of the waste liquid tank 12. The guide member 22 is a hollow elongate tube member, and the longitudinal direction of the container 16 is located substantially perpendicularly at the center of the container 16, and the two are provided at a predetermined interval and in parallel with each other. The upper end portions 22a of the pair of guide members 22 are attached so as to penetrate the lid portion 18 and be drawn outward. The guide member 22 is water-stopped, and is treated so that there is no leakage of liquid droplets from the inside and no entry of liquid droplets or fine solids from the outside. The lower end portion 22b of the guide member 22 reaches a position that is slightly closer to the bottom portion 16b than half of the container 16 in the depth direction. A retaining member (not shown) is provided at the lower end 22 b of the guide member 22.

  A cleaning unit 24 that slides along the longitudinal direction of the guide member 22 is attached to the guide member 22. As shown in FIGS. 4 and 5, the cleaning unit 24 is provided with two ring portions 26 that are slidably inserted in a pair of guide members 22. The pair of ring portions 26 are connected by a rod-shaped link member 28 for the ring portion. The ring connecting member 28 is substantially perpendicular to the insertion direction of the pair of ring portions 26. A cylindrical attachment member 30 is provided at substantially the center in the longitudinal direction of the ring connecting member 28. The attachment member 30 is slightly longer than the ring portion 26, has a slightly smaller diameter, and the insertion direction is substantially parallel to the insertion direction of the ring portion 26. A spray ball 32 that is a cleaning liquid ejecting member is fixed to the upper end portion 30 a of the mounting member 30. The spray ball 32 is a hollow sphere, and a plurality of small through holes are provided through the inside and outside. The through holes are uniformly formed on the surface of the sphere. The spray ball 32 is connected to a flexible tube 34 for sending a cleaning liquid 42 to be described later. One end of the tube 34 is connected to the spray ball 32, and the opposite end passes through the attachment member 30 and extends into the container 16 and is bent in a U-shape near the bottom 16b. One of the pair of guide members 22 is inserted into the hollow inner space from the lower end portion 22b, protrudes outward from the upper end portion 22a, extends to the outside of the lid portion 18, and is connected to a cleaning liquid supply device (not shown). .

  Between the upper end portion 30a and the lower end portion 30b of the mounting member 30, a flange portion 36 is formed in a disk shape that spreads sideways. Three floats 38 are attached to the periphery of the flange portion 36 at equal intervals. The float 38 is a metal hollow sphere, and the inner space is sealed with air or the like and floats in a liquid. The float 38 is connected by a short rod-like float connecting member 40, and the float connecting member 40 is attached along the radial direction of the flange portion 36. All of the three floats 38 are attached at positions where they do not contact the guide member 22.

  The guide member 22 and the cleaning unit 24 are made of stainless steel or the like. In the cleaning unit 24, the joint portions of the ring portion 26, the ring connecting member 28, the attachment member 30, the float 38, and the float connecting member 40 are welded. These are polished like a sanitary pipe, and the surface is polished so that there is no accumulation of liquids, so that it is easy to clean by eliminating the places where germs etc. tend to accumulate. We also expect metal attacks on microorganisms.

  Next, the usage method of the tank cleaning apparatus 10 will be described. The waste liquid tank 12 stores the waste liquid 14 as the waste liquid 14 flows in from the inflow pipe 20 in a state where the lid 18 is closed to the container 16. As shown in FIGS. 1 and 2, the cleaning unit 24 of the in-tank cleaning apparatus 10 has a float 38 that floats on the liquid level 14a of the waste liquid 14, and the spray ball 32 always has a liquid level 14a even if the liquid level 14a rises. It is located at a predetermined height above and does not immerse in liquid. Furthermore, even if the internal pressure of the tube 34 of the cleaning liquid supply system becomes a negative pressure due to some separation, the liquid is not sucked in from the liquid level. No cross contamination. Since the lower end portion 22b of the guide member 22 is provided with a retaining member (not shown), as shown in FIG. 3, the cleaning unit 24 is detached from the guide member 22 and drops even when the waste liquid 14 is small or drained. There is no. When the waste liquid 14 is drained and the cleaning unit 24 is positioned at the lower end 22b, the cleaning unit 24 is held at substantially the center of the container 16 and has a high cleaning efficiency.

  The waste liquid tank 12 drains the waste liquid 14 periodically or when the liquid becomes full, and performs cleaning as necessary. When cleaning, the cleaning liquid 42 is ejected from the spray ball 32 in a state where the lid portion 18 is closed to the container 16 to wash the inner surface of the container 16 and the lid portion 18. The cleaning liquid 42 can be appropriately selected from water, a chemical solution containing a surfactant and a bactericide, and the like. The cleaning liquid 42 accumulates at the bottom 16b of the container 16, and the liquid level 14a gradually rises. However, since the washing unit 24 is floated by the float 38, it is not submerged and cross-contaminated. It rises automatically with the displacement of the liquid surface 14a and cleans the inner surface of the container 16 above the liquid surface 14a. Since the cleaning unit 24 floats on the liquid level 14 a of the waste liquid 14, the upper part from the liquid level 14 a can be cleaned without cross contamination even while the waste liquid 14 is being drained from the container 16. The cleaning time can be shortened. And after washing | cleaning, waste liquid is made to flow in again from the inflow tube 20, and waste liquid is stored.

  According to the in-tank cleaning apparatus 10 of this embodiment, the spray ball 32 is reliably positioned above a predetermined height of the liquid surface 14a of the waste liquid 14 to prevent cross contamination and to clean the inside of the waste liquid tank 12 with a simple structure. Can be washed. Since the cleaning liquid 42 is sent to the spray ball 32 by the flexible tube 34, the tube 34 is connected without any trouble even if the spray ball 32 is raised, and the tube 34 does not move the spray ball 32. Since the height of the spray ball 32 is automatically raised and lowered in accordance with the displacement of the liquid surface 14a of the waste liquid 14 and cleaning is performed, it is not necessary for an operator to enter the container 16 and it is safe. When the waste liquid 14 is a pharmaceutical waste liquid, it may contain a small amount of components that affect the human body, such as steroids and anticancer agents, but it is possible to avoid contact of the worker with the waste liquid 14. .

  Since the spray ball 32 floats on the liquid level 14a of the waste liquid 14, the upper part from the liquid level 14a can be washed without cross contamination even while the waste liquid 14 in the container 16 is being drained. The cleaning time can be shortened. Since the lower end 22b of the guide member 22 is provided with a retaining member (not shown), the cleaning unit 24 does not fall when the waste liquid 14 is removed, and it is safe. When the waste liquid 14 is removed, when the cleaning unit 24 is positioned at the lower end portion 22b, it is substantially at the center of the container 16 and is in a position where the cleaning efficiency is good, and can be cleaned efficiently. Since the cleaning unit 24 is locked to the guide member 22, a stable position can be maintained even if the spray reaction force is applied to the spray ball 32.

  In addition, an air cylinder or the like is not required for raising and lowering the spray ball 32, electricity is not used, and costs are not increased. Since there is no problem with the signal to be raised and lowered, and it always floats on the liquid level 14a, the control is simple. Can be used in places where there is no power supply. Regardless of the type of waste liquid and the size and shape of the waste liquid tank, it can be used for various purposes.

  The in-tank cleaning apparatus of the present invention is not limited to the above embodiment, and the shape of each member can be appropriately changed. The cleaning liquid injection member may be other than the spray ball, and may be an injection nozzle having injection ports in multiple directions, a rotary injection nozzle, or the like. The shape and number of floats are appropriately changed, and the number of floats may be other than three. However, if it is 2 or less, it becomes unstable, and if it is 4 or more, it is costly and takes up space. Further, although the float is described in the text as being made of stainless steel, it is not limited thereto and may be made of resin. The number and shape of the guide members can be changed as appropriate. As long as one of the pair of guide members is hollow and the tube can be inserted, the other may be a rod body or string body having no inner space. The structure of the cleaning unit can be changed as appropriate, as long as the spray ball is positioned higher than the float, and the shape of the cleaning unit and the number of ring portions can be changed according to the number of guide members.

DESCRIPTION OF SYMBOLS 10 In-tank washing | cleaning apparatus 12 Waste liquid tank 14 Waste liquid 18 Lid part 22 Guide member 24 Cleaning unit 26 Ring part 28 Ring connection material 30 Attachment member 32 Spray ball 34 Tube 38 Float 42 Cleaning liquid

Claims (5)

  A guide member provided inside the waste liquid tank and a cleaning unit that is slidably attached to the guide member are provided. The cleaning unit is provided with a float that floats on the waste liquid and a cleaning liquid injection member that injects the cleaning liquid. The tank cleaning apparatus is characterized in that a flexible tube for supplying the cleaning liquid is connected to the cleaning liquid injection member.   The guide member is a rod body, and a plurality of the guide members are provided in parallel to each other in the vertical direction, the upper end portion is attached to the lid portion of the waste liquid tank, and the lower end portion reaches near the middle of the depth of the waste liquid tank. The in-tank cleaning apparatus according to claim 1.   The in-tank cleaning apparatus according to claim 1, wherein a plurality of the floats are provided.   Two guide members are provided, and the cleaning unit includes two ring portions that are slidably inserted in the guide member and a connection for the ring portion that connects the two ring portions. 2. The tank according to claim 1, further comprising: a member and an attachment member provided in the middle of the ring connecting member, wherein the three floats and the cleaning liquid ejecting member are attached to the attachment member. Cleaning device.   The guide member is a hollow tube member, and an end portion of the tube opposite to the cleaning liquid ejecting member is inserted into a hollow inner space of the guide member and pulled out of the waste liquid tank to send the cleaning liquid. 2. The tank cleaning apparatus according to claim 1, wherein the tank cleaning apparatus is connected to a pressurized water pump.

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