JP6162276B1 - Drain pipe cleaning device and drain pipe cleaning method - Google Patents

Abstract

Disclosed is a drain pipe cleaning device and a drain pipe cleaning method capable of circulating a cleaning liquid while avoiding a positive pressure state in the drain pipe even in a very simple connection form. A drain pipe cleaning device 10 stores a cleaning liquid 24 and can supply the cleaning liquid 24 to the upstream side of the drain pipe 18; sucks the cleaning liquid 24 from the downstream side of the drain pipe 18; A suction pump 36 capable of sending the cleaning liquid 24 toward the cleaning liquid tank 38 and a table lift 30 capable of moving the cleaning liquid tank 38 along the height direction of the aircraft body 12 are provided. In the state where the cleaning liquid tank 38 is moved to a position higher than the suction pump 36 using the table lift 30, the drainpipe cleaning apparatus 10 operates the suction pump 36 to circulate the cleaning liquid 24. [Selection] Figure 1

Description

  The present invention includes a drain pipe cleaning device configured to include a drain pipe disposed inside an aircraft body, and cleaning the inside of the drain pipe while circulating a cleaning liquid through a circulation channel passing outside the aircraft body, and drain pipe cleaning Regarding the method.

  Conventionally, a cleaning technique for removing scale accumulated in a drain pipe disposed in a mobile body has been developed. For example, a tubular member (specifically, a hose) is externally connected to the upstream side and downstream side of the drainage pipe from the outside of the mobile machine body to form a circulation channel, and the cleaning liquid is circulated through this circulation channel while the drainage pipe is circulated. A method of cleaning is known.

  In this type of aircraft body, it is desirable to maintain a negative pressure state in which the pressure of the cleaning liquid flowing in the drain pipe (hereinafter referred to as fluid pressure) is lower than atmospheric pressure. This is because the possibility that the cleaning liquid leaks from the joint portion of the drain pipe increases when the fluid pressure in the drain pipe becomes a positive pressure state higher than the atmospheric pressure.

  Therefore, in Patent Document 1, after the entire inside of the circulation flow path including the cleaning liquid tank is brought into a negative pressure state using a vacuum pump, the drain pipe is cleaned while the cleaning liquid is made to flow backward from the downstream side to the upstream side of the drain pipe. Apparatus and methods have been proposed.

Japanese Patent No. 4564529

  However, in the apparatus proposed in Patent Document 1, there is a problem that it is necessary to ensure the hermeticity of the entire circulation flow path and the cleaning operation cannot be started until a negative pressure state is reached. In other words, there remains sufficient room for improvement from the viewpoint of the complexity of the device configuration.

  On the other hand, in order to simplify the configuration of the apparatus, a method may be considered in which the cleaning liquid is sucked from the downstream side of the drain pipe using a suction pump, and the cleaning liquid is sent to the cleaning liquid tank. In this case, the hose connected to the downstream side of the drain pipe is assumed to be arranged in a state where the hose is extended downward, stretched along the ground, and extended upward, and then connected to the upstream side of the drain pipe.

  However, since a pressure loss of the cleaning liquid occurs in the circulation flow path, it is necessary to select a pump having a higher suction performance. Especially in the case of an aircraft body, the drain pipe is located several meters above the ground, so the height component (that is, the length of the hose extending in the height direction) contained in the circulation channel increases, and as a result, There is a tendency for pressure loss to increase.

  The present invention has been made in view of the above-described problems, and even with a very simple connection configuration, a drain pipe cleaning device and drain pipe cleaning capable of circulating a cleaning liquid while avoiding a positive pressure state in the drain pipe It aims to provide a method.

  The “drainage pipe cleaning device” according to the present invention includes a drainage pipe disposed in an aircraft body, and cleans the drainage pipe while circulating a cleaning liquid through a circulation channel that passes outside the aircraft body. A drain pipe cleaning device for storing the cleaning liquid and supplying the cleaning liquid to the upstream side of the drain pipe, sucking the cleaning liquid from the downstream side of the drain pipe, and supplying the cleaning liquid to the drain pipe A suction pump capable of being sent toward the cleaning liquid tank; and a moving means capable of moving the cleaning liquid tank along a height direction of the aircraft body, wherein the cleaning liquid tank is higher than the suction pump using the moving means. In the state moved to the position, the suction pump is operated to circulate the cleaning liquid.

  When compared with tubular members of the same length, it is known that the pressure loss in the vertical direction is considerably larger than that in the horizontal direction. Therefore, by moving the cleaning liquid tank to a position higher than the suction pump using the moving means, it is included in the flow path section from the cleaning liquid tank to the suction pump among the circulation flow paths configured outside the aircraft body. The height component is reduced. Then, as the height component decreases, the pressure loss in the flow path section is remarkably reduced, and it is not necessary to use a high-performance suction pump. Thereby, even if it is a very simple connection form, a washing | cleaning liquid can be circulated, avoiding the positive pressure state in a drain pipe.

  Further, it is preferable that the cleaning liquid is circulated in a state where the cleaning liquid tank is moved to a height position of the drain pipe or in the vicinity of the height position. Since the height component contained in the flow path section from the cleaning liquid tank to the drain pipe becomes minute, the pressure loss can be further reduced.

  Further, it is preferable that the moving means is capable of moving the cleaning liquid tank during the circulation of the cleaning liquid. By utilizing the fact that the fluid pressure in the circulation flow path is changed by the movement of the cleaning liquid tank, the circulation state of the cleaning liquid can be finely adjusted.

  The cleaning liquid tank preferably has a shape in which at least a part of the upper part is open. Since the atmospheric pressure is applied to the stored cleaning liquid from the outside, the cleaning liquid in the cleaning liquid tank is naturally sent toward the drain pipe without providing another pump between the cleaning liquid tank and the drain pipe.

  Moreover, it is preferable to further provide a vehicle equipped with a table lift as the moving means. The operator can easily change the relative position of the table lift with respect to the aircraft body by driving the vehicle. In addition, by accommodating the equipment constituting the drain pipe cleaning device on the folded table lift, the transport operation of the drain pipe cleaning device becomes extremely easy.

  The “drainage pipe cleaning method” according to the present invention includes a drainage pipe disposed in an aircraft body, and cleans the drainage pipe while circulating a cleaning liquid through a circulation channel passing outside the aircraft body. A tank disposing step for storing the cleaning liquid and disposing a cleaning liquid tank capable of supplying the cleaning liquid to the upstream side of the drain pipe; inhaling the cleaning liquid from the downstream side of the drain pipe; and A pump disposing step of disposing a suction pump capable of sending the cleaning liquid toward the cleaning liquid tank on the downstream side of the drainage pipe; and the cleaning liquid tank at a position higher than the suction pump along the height direction of the aircraft body. A moving step of moving, and a circulating step of circulating the cleaning liquid by the operation of the suction pump.

  According to the drain pipe cleaning device and the drain pipe cleaning method according to the present invention, it is possible to circulate the cleaning liquid while avoiding the positive pressure state in the drain pipe even with a very simple connection form.

It is a whole lineblock diagram of the drain pipe cleaning device concerning this embodiment. FIG. 2A is a side view showing a transport state of the drainpipe cleaning apparatus of FIG. FIG. 2B is an enlarged view of the load shown in FIG. It is a flowchart regarding the drain pipe cleaning method using the drain pipe cleaning apparatus shown in FIG. FIG. 4A is a schematic diagram showing the arrangement of the suction pump and the cleaning liquid tank in the comparative example. FIG. 4B is a schematic explanatory diagram of pressure loss caused by the arrangement relationship shown in FIG. FIG. 5A is a schematic diagram showing the arrangement of the suction pump and the cleaning liquid tank in the example. FIG. 5B is a schematic explanatory diagram of pressure loss that occurs in the arrangement relationship shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a drain pipe cleaning apparatus according to the present invention will be described with reference to the accompanying drawings by giving preferred embodiments in relation to a drain pipe cleaning method.

[Whole structure of drain pipe cleaning apparatus 10]
FIG. 1 is an overall configuration diagram of a drain pipe cleaning device 10 according to this embodiment. The drain pipe cleaning device 10 is a device that cleans the drainage system 14 in the aircraft body 12 that is stopped on the ground G. The drainage system 14 includes, in order from the upstream side toward the downstream side, a toilet 16 including a wash basin or a toilet bowl (both not shown), a drain pipe 18 connected to the wash basin or the toilet bowl, and drainage from the drain pipe 18. It is comprised from the in-machine tank 20 which stores. In the example of a large passenger plane, the drain pipe 18 is at a position higher than the ground G by several meters (for example, 5 m).

  The drain pipe cleaning device 10 cleans the drain pipe 18 while circulating the cleaning liquid 24 through the circulation flow path 22 formed by a plurality of tubular members. The “tubular member” is a general term for pipes, tubes, and hoses. Further, the type of the cleaning liquid 24 may be appropriately selected according to the component / amount of scale deposited on the drain pipe 18 and the shape / length of the drain pipe 18. For example, when removing the scale containing a calcium compound, the composition of the cleaning liquid 24 preferably includes oxycarboxylic acid (for example, L-malic acid, citric acid) and sulfamic acid (for example, amidosulfonic acid) as components. .

  The drain pipe cleaning device 10 stores a vehicle 32 equipped with a table lift 30 (moving means), a strainer 34 for removing foreign substances in the cleaning liquid 24, a suction pump 36 capable of sucking and discharging the cleaning liquid 24, and a cleaning liquid 24. Cleaning liquid tank 38 and flexible hoses 40-43. In the illustrated example, the vehicle 32, the strainer 34, and the suction pump 36 are each disposed on the ground G.

  The in-machine tank 20 is connected to one end side of the hose 40, and a strainer 34 is connected to the other end side. A strainer 34 is connected to one end side of the hose 41, and a suction pump 36 is connected to the other end side. A suction pump 36 is connected to one end side of the hose 42, and a cleaning liquid tank 38 is connected to the other end side. A cleaning liquid tank 38 is connected to one end side of the hose 43, and a drain pipe 18 is connected to the other end side via a connection portion 44 in the toilet 16.

  As understood from this figure, the circulation flow path 22 connects the drain pipe 18, the in-machine tank 20, the hose 40, the strainer 34, the hose 41, the suction pump 36, the hose 42, the cleaning liquid tank 38 and the hose 43 in a permutation. Is formed. In other words, the circulation flow path 22 is a flow path that includes the drain pipe 18 disposed in the aircraft body 12 and that passes through the outside of the aircraft body 12.

  The table lift 30 is configured to be able to move the equipment including the cleaning liquid tank 38 along the height direction (substantially the vertical direction or the vertical direction) of the aircraft body 12 by expanding or folding the legs. . The strainer 34 is provided with a pressure gauge 46 for measuring and indicating the fluid pressure of the cleaning liquid 24. The suction pump 36 is a pump that variably operates the suction pressure automatically or manually. The cleaning liquid tank 38 has a shape in which at least a part of the upper part is open, and the cleaning liquid 24 is exposed to the outside.

  A transport vehicle 50 shown in FIG. 2A is a vehicle 32 that accommodates a load 52 in a state where the legs of the table lift 30 are folded. As shown in FIG. 2 (B), the load 52 is made up of components constituting the drain pipe cleaning device 10, specifically, a strainer 34 (pressure gauge 46), a suction pump 36, a cleaning liquid tank 38, and a hose 40, 42 is included.

[Operation of Drain Pipe Cleaning Device 10]
The drain pipe cleaning device 10 according to this embodiment is configured as described above. Next, a method for cleaning the drain pipe 18 using the drain pipe cleaning apparatus 10 will be described in detail with reference to the flowchart of FIG.

  In step S <b> 1, the worker executes the “transportation process” of the drain pipe cleaning device 10. Specifically, the operator operates the transport vehicle 50 that accommodates the load 52 and stops near the aircraft body 12 that is the cleaning target of the drain pipe 18 (specifically, a position where the toilet 16 can be accessed). Let And the conveyance of the drainpipe washing | cleaning apparatus 10 is completed by unloading the load 52 from the conveyance vehicle 50. FIG.

  By preparing the vehicle 32 on which the table lift 30 is mounted, the relative position of the table lift 30 with respect to the aircraft body 12 can be easily changed by the driving operation of the vehicle 32. In addition, since the equipment constituting the drain pipe cleaning device 10 is accommodated on the folded table lift 30, the transport operation of the drain pipe cleaning device 10 becomes extremely easy.

  In step S <b> 2, the operator executes the “arrangement process” of the drain pipe cleaning device 10. Specifically, the operator arranges the cleaning liquid tank 38 in which the unused cleaning liquid 24 is stored on the table lift 30 (S21), and arranges the strainer 34 and the suction pump 36 on the ground G (S22). Both ends of the hoses 40 to 42 and one end of the hose 43 are connected to a predetermined part (S23). Note that the table lift 30 is in a folded state at this point, and the other end side of the hose 43 is not yet connected to the connecting portion 44 in the toilet 16.

  In step S <b> 3, the operator performs a “movement process” of the cleaning liquid tank 38. The cleaning liquid tank 38 rises to a position higher than the suction pump 36 (specifically, the height position of the drain pipe 18) by expanding the legs of the table lift 30 according to the operation of the operator. Thereafter, when the operator connects the other end of the hose 43, the circulation flow path 22 that passes outside the aircraft body 12 is formed.

  Here, if the cleaning liquid tank 38 is arranged at a position higher than the suction pump 36, an effect of reducing the pressure loss described later can be obtained. In particular, a higher effect can be obtained by moving the cleaning liquid tank 38 to the height position of the drain pipe 18 (that is, the connection portion 44) or close to the height position. This “neighborhood” generally means a height range within 1 m above and below.

  In step S <b> 4, the operator performs a “circulation process” of the cleaning liquid 24. Specifically, the operator starts the operation of the suction pump 36 after setting a suction pressure for obtaining a target negative pressure state. Then, the suction pump 36 sends the cleaning liquid 24 toward the cleaning liquid tank 38 while sucking the cleaning liquid 24 from the downstream side of the drain pipe 18 (that is, the in-machine tank 20).

  Here, since the cleaning liquid tank 38 has a shape in which at least a part of the upper part is open, atmospheric pressure is applied to the stored cleaning liquid 24 from the outside. Accordingly, the cleaning liquid 24 in the cleaning liquid tank 38 is naturally fed toward the drain pipe 18 without providing a separate pump between the cleaning liquid tank 38 and the drain pipe 18.

  Further, the table lift 30 may move the cleaning liquid tank 38 along the height direction while the cleaning liquid 24 is circulating. The circulation state of the cleaning liquid 24 can be finely adjusted using the fact that the fluid pressure in the circulation flow path 22 is changed by the movement of the cleaning liquid tank 38.

  In step S <b> 5, the operator performs a “withdrawal process” of the drain pipe cleaning device 10. Basically, the procedure shown in steps S1 to S4 may be performed retrospectively. Specifically, [1] stop the suction pump 36, [2] discharge / collect the cleaning liquid 24, [3] remove the hoses 40 to 43, [4] lower the table lift 30, and [5] contain each device. [6] Removal of the transport vehicle 50 is sequentially executed.

[Effects of drain pipe cleaning device 10]
<Comparative example>
First, a drain pipe cleaning method in a comparative example will be described with reference to FIG. More specifically, FIG. 4A is a schematic diagram showing the arrangement of the suction pump 36 and the cleaning liquid tank 38 in the comparative example. FIG. 4B is a schematic explanatory diagram of pressure loss caused by the arrangement relationship shown in FIG.

  Here, “P” shown in FIG. 4A is an abbreviation for the suction pump 36, and “T” is an abbreviation for the cleaning liquid tank 38. In order to facilitate understanding, the circulation flow path 22 is simplified and handled as a rectangular shape having flow path positions C1, C2, C3, and C4 as four vertices. The C1-C2 direction and the C3-C4 direction correspond to the “horizontal direction”, and the C2-C3 direction and the C4-C1 direction correspond to the “height direction”. The same applies to FIG. 5A described later.

  This “comparative example” shows an arrangement relationship in which the suction pump 36 and the cleaning liquid tank 38 are at the height position of the ground G, respectively. Further, only the hoses 40 and 43 and the drain pipe 18 are shown as tubular members constituting the circulation flow path 22.

  The horizontal axis of the graph shown in FIG. 4B indicates the flow path position (C 1 → C 2 → C 3 → C 4 → C 1), and the vertical axis of the graph indicates the pressure loss in the circulation flow path 22. The same applies to FIG. 5B described later.

  It is known that this pressure loss is substantially proportional to the length of the tubular member, and the proportionality coefficient changes according to the extending direction. When compared with the same length, the pressure loss in the height direction (hatched portion) is about 10 times the pressure loss in the horizontal direction.

  In the flow path sections C1-C2 and C3-C4, the pressure loss increases with a relatively gentle gradient in proportion to the length of the hose 43 or the drain pipe 18. On the other hand, in the flow path sections C2-C3 and C4-C1, the pressure loss increases with a relatively steep slope in proportion to the length of the hose 43 or the drain pipe 18.

  That is, when determining the necessary suction force of the suction pump 36, the pressure loss generated in the flow path section (C1 → C2 → C3 → C4 → C1) from the cleaning liquid tank 38 to the suction pump 36 must be considered. . In this example, since a large pressure loss ΔP1 occurs in the flow path section indicated by the white arrow, a high performance suction pump 36 must be used.

<Example>
Next, a drain pipe cleaning method in the embodiment will be described with reference to FIG. More specifically, FIG. 5A is a schematic diagram showing the arrangement of the suction pump 36 and the cleaning liquid tank 38 in the embodiment. FIG. 5B is an explanatory diagram of pressure loss caused by the arrangement relationship shown in FIG.

  This “Example” shows an arrangement relationship in which the suction pump 36 is at the height position of the ground G and the cleaning liquid tank 38 is at the height position of the drain pipe 18. Further, only the hoses 40 and 42 and the drain pipe 18 are shown as tubular members constituting the circulation flow path 22.

  As shown in FIG. 5 (B), the relationship between the position in the circulation flow path 22 and the pressure loss matches the graph shown in FIG. 5 (A). However, when determining the required suction force of the suction pump 36, the pressure loss generated in the flow path section (C3 → C4 → C1) from the cleaning liquid tank 38 to the suction pump 36 may be considered. In this example, since the pressure loss ΔP2 (about half of ΔP1) generated in the flow path section indicated by the white arrow is reduced, it is not necessary to use the high-performance suction pump 36.

<Summary>
The drain pipe cleaning device 10 includes a drain pipe 18 disposed in the aircraft body 12 and is disposed in the drain pipe 18 while circulating the cleaning liquid 24 through the circulation flow path 22 passing outside the aircraft body 12. [1] A cleaning liquid tank 38 that stores the cleaning liquid 24 and can supply the cleaning liquid 24 to the upstream side of the drain pipe 18; [2] The cleaning liquid 24 is sucked from the downstream side of the drain pipe 18; And a suction pump 36 capable of delivering the cleaning liquid 24 toward the cleaning liquid tank 38, and [3] a table lift 30 capable of moving the cleaning liquid tank 38 along the height direction of the aircraft body 12. [4] The drainpipe cleaning apparatus 10 operates the suction pump 36 to circulate the cleaning liquid 24 in a state where the cleaning liquid tank 38 is moved to a position higher than the suction pump 36 using the table lift 30.

  This drain pipe cleaning method is configured to include a drain pipe 18 disposed in the aircraft body 12, and the inside of the drain pipe 18 is circulated through the circulation flow path 22 passing outside the aircraft body 12 while circulating the cleaning liquid 24. [1] A tank disposing step (S21) in which the cleaning liquid 24 is stored and the cleaning liquid tank 38 capable of supplying the cleaning liquid 24 to the upstream side of the drain pipe 18 is disposed. [2] The drain pipe 18 A pump disposing step (S22) for disposing a suction pump 36 that can suck in the cleaning liquid 24 from the downstream side and send the cleaning liquid 24 toward the cleaning liquid tank 38 on the downstream side of the drain pipe 18, and [3] the aircraft body 12 A moving step (S3) for moving the cleaning liquid tank 38 to a position higher than the suction pump 36 along the height direction, and [4] a circulation step (S4) for circulating the cleaning liquid 24 by operating the suction pump 36. , Comprising a.

  When compared with tubular members of the same length, it is known that the pressure loss in the vertical direction is considerably larger than that in the horizontal direction. Therefore, by moving the cleaning liquid tank 38 to a position higher than the suction pump 36 using the table lift 30, the cleaning liquid tank 38 to the suction pump 36 in the circulation flow path 22 configured via the outside of the aircraft body 12. The height component (that is, the length of the tubular member extending in the height direction) included in the flow path section is reduced. Then, as the height component decreases, the pressure loss in the flow path section is remarkably reduced, and it is not necessary to use the high-performance suction pump 36. Thereby, even if it is a very simple connection form, the washing | cleaning liquid 24 can be circulated, avoiding the positive pressure state in the drain pipe 18. FIG.

  In particular, it is more preferable to circulate the cleaning liquid 24 in a state where the cleaning liquid tank 38 is moved to the height position of the drain pipe 18 or in the vicinity of the height position. Since the height component contained in the flow path section from the cleaning liquid tank 38 to the drain pipe 18 becomes minute, the pressure loss can be further reduced.

[Supplement]
In addition, this invention is not limited to embodiment mentioned above, Of course, it can change freely in the range which does not deviate from the main point of this invention.

  For example, the cleaning liquid tank 38 is not limited to the table lift 30 that can move, and any means may be used as long as the cleaning liquid tank 38 can be moved along the height direction of the aircraft body 12. Moreover, it is not restricted to the form mounted in the vehicle 32, You may provide a single moving means.

  Further, the type, application, or size of the aircraft body 12 to be cleaned is arbitrary. In this case, the cleaning liquid tank 38 may be moved to a height position suitable for the aircraft body 12. In particular, the effect of the present invention is remarkably exhibited if the machine body has the drain pipe 18 at a high position.

DESCRIPTION OF SYMBOLS 10 ... Drain pipe washing device 12 ... Aircraft body 14 ... Drainage system 16 ... Toilet 18 ... Drain pipe 20 ... In-machine tank 22 ... Circulation channel 24 ... Cleaning liquid 30 ... Table lift (moving means) 32 ... Vehicle 34 ... Strainer 36 ... Suction Pump 38. Cleaning liquid tank 40 to 43 Hose 44 Connection 46 Pressure gauge 48 Table 50 Transport vehicle 52 Load C1 to C4 Flow path position G Ground

Claims (6)

A drain pipe cleaning device configured to include a drain pipe disposed in an aircraft body and cleaning the inside of the drain pipe while circulating a cleaning liquid through a circulation channel passing outside the aircraft body,
A cleaning liquid tank for storing the cleaning liquid and capable of supplying the cleaning liquid to the upstream side of the drain pipe;
A suction pump capable of sucking the cleaning liquid from the downstream side of the drain pipe and sending the cleaning liquid toward the cleaning liquid tank;
Moving means capable of moving the cleaning liquid tank along a height direction of the aircraft body,
A drainpipe cleaning apparatus, wherein the cleaning liquid is circulated by operating the suction pump in a state where the cleaning liquid tank is moved to a position higher than the suction pump using the moving means.   The drain pipe cleaning apparatus according to claim 1, wherein the cleaning liquid is circulated in a state where the cleaning liquid tank is moved to a height position of the drain pipe or in the vicinity of the height position.   The drain pipe cleaning device according to claim 1 or 2, wherein the moving means is capable of moving the cleaning liquid tank during circulation of the cleaning liquid.   The drain cleaning apparatus according to any one of claims 1 to 3, wherein the cleaning liquid tank has a shape in which at least a part of the upper part is open.   The drain pipe cleaning apparatus according to any one of claims 1 to 4, further comprising a vehicle on which a table lift as the moving means is mounted. A drain pipe cleaning method comprising a drain pipe disposed in an aircraft body, and cleaning the drain pipe while circulating a cleaning liquid through a circulation channel passing outside the aircraft body,
A tank disposing step of storing the cleaning liquid and disposing a cleaning liquid tank capable of supplying the cleaning liquid to the upstream side of the drain pipe;
A pump disposing step of sucking the cleaning liquid from the downstream side of the drain pipe and disposing a suction pump capable of sending the cleaning liquid toward the cleaning liquid tank on the downstream side of the drain pipe;
A moving step of moving the cleaning liquid tank to a position higher than the suction pump along a height direction of the aircraft body;
And a circulation step of circulating the cleaning liquid by the operation of the suction pump.

Images