JP6663205B2 - Automatic drainage device and drainage method - Google Patents

Description

The present invention relates to an automatic drainage device that automatically drains a liquid in a tank. The present invention also relates to a drainage method for draining a liquid in a tank. In particular, the automatic drainage device and the drainage method according to the present invention are preferably used for temporarily storing a liquid containing a foreign substance that causes clogging of a pump or a pipe in a tank and discharging the liquid from the tank. The liquid containing foreign matter includes, for example, drain generated from a showcase of a store, human waste, and the like.

In a frozen or refrigerated showcase of a store, moisture in the air that has come into contact with the cooler is condensed to form dew or frost, which causes drainage. This drain must be discharged outside the store.

Conventionally, draining these drains outside the store has been done by digging a pit on the floor, laying drainage pipes down the slope, and naturally draining the drain of the showcase to the outside through these drainage pipes. Was normal. However, there are cases where the showcase must be installed in a place away from the drainage pipe or in a place without the drainage pipe. In such a case, it is difficult to dig a new pit on the floor and lay a drainage pipe each time. This is especially true when the building is made of reinforced concrete, as in department stores. Therefore, it has been proposed that the drain is once guided to a tank by a pipe, and the drain accumulated in the tank is forcibly discharged by a pump (see Patent Documents 1 and 2 and the like). At that time, a vertical pipe extending to the ceiling was connected to the discharge port of the pump, and the vertical pipe was connected to a horizontal pipe at the ceiling and the drain was discharged to the outside through the horizontal pipe.

JP 2005-331171 A Japanese Patent Application Laid-Open No. H11-148771

However, the conventional method has the following problems. The drain generated in a showcase often contains food waste peculiar to the displayed product. For example, drains generated from vegetable showcases are apt to be mixed with pieces of vegetable leaves, mud, sand, etc. Is easily mixed. Also, the drain generated from the showcase is contaminated with various organic substances and bacteria, which cause slime. These debris and slime components often caused pump failures and clogged pipes. Furthermore, when performing maintenance on the pumps and pipes, the operator is in trouble, for example, heavily soiled and smells bad.

The present invention has been made in view of the above circumstances, and has an automatic drainage device and a drainage device that can discharge a liquid in a tank, particularly a liquid containing a foreign substance, without causing a pump failure or clogging of a pipe. It seeks to provide a way.

In order to solve the above problems, the automatic drainage device according to the present invention includes a sealed tank for storing a liquid to be discharged including foreign matter, and a pressure-feeding liquid for pushing until the foreign matter disappears in the tank. A first drainage mechanism for discharging the foreign matter together with the liquid to the upper side of the tank , and discharging the push-out liquid remaining in the tank so that a new liquid to be discharged can be received in the tank. And a secondary drainage mechanism that causes the secondary drainage mechanism (claim 1).

In the present invention, the tank is sealed with the liquid stored in the tank, and the liquid to be discharged from the tank is discharged by the first drainage mechanism. Even if the liquid to be discharged stored in the tank contains foreign matter such as dust and slimming components, the dust and slimming components are forcibly discharged by the pushing pressure of the pushing liquid. Further, the pushing pressure of the pushing liquid also has an effect of cleaning the inner wall of the tank and the inner wall of the drain pipe. Since the primary drainage mechanism does not use a pump, there is no problem such as failure of the pump. Note that a liquid containing no foreign matter is used as the liquid for extrusion.

After all the liquid in the tank is replaced by the liquid for pushing, the pumping of the liquid for pushing into the tank is stopped. Then, the extruding liquid remaining in the tank is discharged by the secondary drainage mechanism. The secondary drain mechanism substantially empties the tank so that new liquid to be drained can be received in the tank.

A preferred embodiment exemplifies a mode in which the foreign matter in the tank is pressure-fed to the height of the ceiling together with the liquid by the liquid for extrusion (claim 2).

As a preferred embodiment, a mode in which the pressure of the liquid for extrusion is 0.2 megapascal or more is described (claim 3).

As a preferred embodiment, a first drainage line constituting the primary drainage mechanism, and a second drainage line constituting the secondary drainage mechanism, The first drain pipe has an inner diameter larger than that of the second drain pipe, and the second drain pipe is open near the bottom of the tank. .

In this case, the liquid to be drained is discharged through a first drain pipe having a large inner diameter. Therefore, even if the liquid to be discharged contains dust and slime components, there is no problem such as the first drain pipe being clogged. The primary drainage mechanism completely pushes out dirt and slime in the tank to the outside. For this reason, there is no dust or slime in the extruding liquid remaining in the tank. Therefore, in discharging the liquid for pushing out from the tank by the pressure feeding of air in the secondary drainage mechanism, the second drainage line has a large inner diameter as in the first drainage line. No need to use things.

As a preferred embodiment, a sealed tank for storing a liquid to be discharged, and a primary drainage mechanism for discharging a liquid to be discharged from the tank by pumping a liquid for extrusion into the tank And a secondary drainage mechanism for discharging the liquid for extrusion remaining in the tank and allowing a new liquid to be discharged to be received in the tank, comprising: The primary drainage mechanism includes: a liquid supply pipe for pressure-feeding the liquid for pushing into the tank; a liquid supply control valve disposed on the liquid supply pipe; A first drainage line for discharging the liquid in the tank to the outside by pumping the liquid for extrusion, and a first drainage control valve disposed on the first drainage line. A control device that controls opening and closing of the liquid supply control valve and the first drainage control valve, The secondary drainage mechanism includes an air supply pipe for feeding air into the tank, an air supply control valve disposed on the air supply pipe, and the air supply control valve remaining in the tank. A second drainage line for discharging the liquid for pushing out by pressurizing the air into the tank, a second drainage control valve disposed on the second drainage line, A control device for controlling opening and closing of the air supply control valve and the second drain control valve, wherein the first drain pipe has an inner diameter larger than the second drain pipe, An example in which the second drain pipe is opened near the bottom of the tank will be exemplified (claim 5). Also in this case , the operation and effect described in paragraph 0015 can be obtained.

The drainage method according to the present invention is a method for discharging a liquid containing a foreign substance in the tank by pumping a liquid for extrusion into a closed tank and discharging the liquid upward from the tank until there is no more foreign substance in the tank . A first draining step, and a second draining step of discharging the pushing liquid remaining in the tank and substantially emptying the tank. ).

It is a fluid and control circuit diagram of an automatic drainage device concerning one embodiment of the present invention. It is a fluid and control circuit diagram of an automatic drainage device according to another embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

In the example of FIG. 1, a showcase 1 for freezing or refrigeration of a store is shown as a liquid generation source. However, the application of the automatic drainage device according to the present invention is not limited to draining drain generated from a showcase. INDUSTRIAL APPLICABILITY The automatic drainage device according to the present invention can be widely applied to, for example, discharge of a liquid including a foreign matter that causes clogging of a pipe or a pump, such as other drains, sewage, and human waste.

As shown in FIG. 1, an automatic drainage device 100 according to one embodiment of the present invention includes a closed box-shaped tank 2 that stores a drain as a liquid to be discharged. A drain transfer pipe 3 extending downward from the showcase 1 is connected to the tank 2. Through the drain transfer pipe 3, the drain generated in the showcase 1 flows naturally into the tank 2 by gravity. Although a single showcase 1 is shown in FIG. 1, a drain transfer pipe 3 extends from each of the plurality of showcases, and these drain transfer pipes 3 communicate with a single drain collecting pipe (not shown). May be connected to the single tank 2.

In the present embodiment, the liquid in the tank is discharged by two different discharge methods in different modes. As the first drainage process, the tank 2 is sealed when the drain is accumulated in the tank 2, and the liquid accumulated in the tank 2 is discharged by pumping the liquid for draining out into the sealed tank 2. The liquid is forcibly discharged through one drain pipe 4. As a result, the drain in the tank 2 is discharged, but the liquid for draining remains in the tank 2. Therefore, as a secondary drainage process, air is forced into the closed tank 2 to force drainage liquid remaining in the tank 2 to drain through the second drain pipe 5. .

First, the primary drainage mechanism for performing the primary drainage step will be described.

A drain inflow control valve 6 for controlling the inflow of drain from the showcase 1 to the tank 2 is provided on the drain transfer pipe 3. As the drain inflow control valve 6, for example, an electric valve is adopted as an automatic valve suitable for increasing the diameter. The drain inflow control valve 6 is normally open when the tank 2 receives the drain, and the drain generated in the showcase 1 naturally flows into the tank 2 by gravity. The drain inflow control valve 6 is closed only when the drain or liquid in the tank 2 is forcibly discharged. The drain inflow control valve 6 is connected to a control device 7 including a microcomputer. The control device 7 controls the operation of the entire automatic drainage device 100. In the closed state, the drain inflow control valve 6 shuts off the space between the showcase 1 and the tank 2 in a gas-liquid tight manner.

In the case where the drain collecting pipe for collecting the drains of a plurality of showcases is provided, the drain inflow control valve 6 is disposed on the drain collecting pipe.

A liquid supply pipe line 8 is connected to the drain transfer pipe 3 downstream of the drain inflow control valve 6. The liquid supply pipe 8 may be connected so as to be directly connected to the tank 2. The liquid supply pipe 8 is a pipe for pressure-feeding the liquid for draining out into the tank 2. The liquid supply pipe 8 is piped upward, is piped horizontally on the ceiling 15, and communicates with a water pipe 9 as a pressurized water supply source. As the pressurized water supply source, besides the water pipe, a pump communicated with an appropriate water source can also be adopted. Instead of tap water, rainwater or groundwater stored in a water tank may be used as the liquid for draining. This can save water bills. As the liquid for pushing out the drain, a liquid that does not contain foreign matter that may cause clogging of the pipe is used.

A liquid supply control valve 10 that is normally closed except for liquid supply is provided on the liquid supply line 8. As the liquid supply control valve 10, for example, an electric valve is adopted as an automatic valve suitable for increasing the diameter. The liquid supply control valve 10 is connected to the control device 7. In the closed state, the liquid supply control valve 10 gas-liquid shuts off between the pressurized water supply source 9 and the tank 2.

An upper limit water level sensor 11, such as a float type or an electrode rod type, for detecting the upper limit L1 of the water level in the tank 2 is provided in an upper portion in the tank 2. The sensor 11 issues a signal when the water level in the tank 2 reaches a predetermined upper limit level L1 due to the inflow of drain. The upper limit water level sensor 11 is connected to the control device 7, and a full signal of the upper limit water level sensor 11 is input to the control device 7.

When a float type sensor is used, the upper limit water level sensor 11 is vertically movably disposed in a cylindrical cover 12 extending in the vertical direction. The tubular cover 12 protects the upper-limit water level sensor 11 from ripples of the liquid in the tank 2 when the liquid for draining is supplied. A bypass pipe 13 for communicating the inside of the tank 2 with the atmosphere is provided on the closed upper part of the cylindrical cover 12, and a tip of the bypass pipe 13 is positioned higher than the upper limit water level sensor 11. , An atmosphere release valve 14 is provided. The air release valve 14 is always open when the drain is received by the tank 2, and allows the drain to smoothly flow into the tank 2. The atmosphere release valve 14 is connected to the control device 7 and is closed only when the control signal from the control device 7 is received and the drain or liquid in the tank 2 is forcibly discharged. As the atmosphere release valve 14, for example, a solenoid valve is used as an automatic valve suitable for high-speed operation. In the closed state, the air release valve 14 shuts off the inside and the outside of the tank 2 in a gas-liquid tight manner. In the case where an electrode rod type sensor is used instead of the float type sensor, the cylindrical cover 12 is unnecessary. In this case, a pipe for opening to the atmosphere may be provided at the upper part of the tank 2, and an air opening valve may be provided at the end of the pipe.

A first drain pipe 4 for discharging drain is connected to the uppermost part of the tank 2. The first drainage pipe 4 is piped upward from the tank 2, is piped laterally at the ceiling 15, and communicates with the drain pipe 16. A first drain control valve 17 that is normally closed except for forced drainage is disposed on the first drain pipe 4. The first drain control valve 17 is connected to the control device 7, and is opened only when the drain is forcibly discharged in response to a control signal from the control device 7. As the first drainage control valve 17, for example, a motor-operated valve as an automatic valve suitable for increasing the diameter is adopted. In the closed state, the first drainage control valve 17 shuts off the inside and outside of the tank 2 in a gas-liquid tight manner.

The liquid in the tank 2 is forcibly discharged through the first drain pipe 4 by pumping the liquid for pushing out into the tank 2 through the liquid feed pipe 8. The drain discharged through the first drain pipe 4 often contains dust corresponding to the articles displayed in the showcase 1. These dusts pass through the first drain control valve 17 and the first drain pipe 4 while being contained in the drain. Therefore, it is preferable that the first drain control valve 17 and the first drain pipe 4 have large diameters from the viewpoint of preventing dust clogging.

Next, a secondary drainage mechanism for performing the secondary drainage step will be described.

A compressor 19 is connected to the tank 2 via an air supply pipe 18 for supplying compressed air into the tank 2. The compressor 19 is connected to the control device 7, and starts or stops in response to a control signal from the control device 7. An air supply control valve 20 for controlling the supply of compressed air into the tank 2 is provided on the air supply pipe 18. The air supply control valve 20 is normally closed except when air is supplied into the tank 2. The air supply control valve 20 is connected to the control device 7, and receives the control signal from the control device 7 and is opened only when air is supplied from the tank 2. As the air supply control valve 20, for example, a solenoid valve is used as an automatic valve suitable for high-speed operation. The air supply control valve 20 shuts off the inside and outside of the tank 2 in a gas-liquid tight manner in the closed state.

In the vicinity of the bottom of the tank 2, a second drain pipe 5 for discharging the liquid for pushing out the drain remaining in the tank 2 is connected. The second drainage pipe 5 is piped toward the ceiling 15 like the first drainage pipe 4, is laterally piped at the ceiling 15, and communicates with the sewer pipe 16. A second drain control valve 21 that is normally closed except for forced drainage of the liquid for draining is disposed on the second drain pipe line 5. The second drainage control valve 21 is connected to the control device 7, and is opened only when the control signal from the control device 7 is received and the liquid for pushing out is forcibly drained. As the second drain control valve 21, for example, an electromagnetic valve is used as an automatic valve suitable for high-speed operation. In the closed state, the second drain control valve 21 shuts off the inside and outside of the tank 2 in a gas-liquid tight manner.

When the air is pressure-fed into the closed tank 2 through the air supply pipe 18, the liquid for drain drain remaining in the tank 2 is forcibly discharged through the second drain pipe 5. It is preferable that the second drain pipe 5 has an inner diameter smaller than that of the first drain pipe 8. This is because the liquid for pushing out the drain remaining in the tank 2 can be quickly discharged at a high pressure by supplying air.

A lower limit water level sensor 22 of a float type or the like for detecting a lower limit L2 of the water level in the tank 2 is provided in a lower portion in the tank 2. The sensor 22 issues a signal when the water level in the tank 2 reaches a predetermined lower limit level L2 due to discharge of the liquid for draining. The lower limit water level sensor 22 is connected to the control device 7, and a detection signal of the lower limit water level sensor 22 is input to the control device 7.

The primary drainage mechanism and the secondary drainage mechanism operate as follows. The drain generated in the showcase 1 naturally flows into the tank 2 through the drain transfer pipe 3. At this time, the drain inflow control valve 6 and the atmosphere release valve 14 are open, and the liquid supply control valve 10, the first drainage control valve 17, the air supply control valve 20, and the second drainage control valve 21 Both are in the closed state. Since the atmosphere release valve 14 is in the open state, the drain smoothly flows into the tank 2.

When the water level of the drain in the tank 2 reaches a predetermined upper limit level L1, the upper limit water level sensor 11 in the tubular cover 12 issues a full water signal. The full signal is input to the control device 7, which outputs a signal for closing the drain inflow control valve 6. As a result, when the drain inflow control valve 6 is closed, a signal for closing the atmosphere release valve 14 is output via the control device 7. As a result, when the atmosphere release valve 14 is closed, the liquid supply control valve 10 is subsequently opened. As a result, the liquid for draining is pumped into the closed tank 2 through the liquid supply pipe 10, and the water pressure in the tank 2 increases. Slightly after the supply control valve 10 opens, the first drain control valve 17 opens according to a signal from the control device 7. As a result, the drain in the tank 2 is rapidly pushed out toward the ceiling 15 through the first drainage pipe 4, and is discharged from the ceiling 15 to the drain pipe 16.

The reason why the first drain control valve 17 opens slightly later than the feed control valve 10 is that the first drain control valve 17 opens after the water pressure in the tank 2 is sufficiently increased by the start of the supply of the liquid for pushing. This is because the opening of can surely prevent the dust possibly remaining in the first drain pipe 4 from flowing back into the tank 2. The time difference between the opening of the first drainage control valve 17 and the opening of the first drainage control valve 17 after the supply of the liquid supply control valve 10 may be appropriately set according to the water pressure of the pressurized water supply source 9 and the like.

It is preferable that the pressure of the liquid for drain extrusion supplied into the tank 2 through the liquid supply line 8 is 0.2 MPa or more. This means that the head pressure is about 20 m or more . Therefore, the drain of the showcase installed in the floor, even at ceiling height of 10 m, can be sufficiently discharged to ceiling with water pressure. As described above, as a water source, rainwater can be collected and used, or groundwater can be pumped and used. In these cases, the pressure is appropriately increased by a pump.

By pumping the liquid for drain extrusion into the tank 2 through the liquid supply line 8, the drain in the tank 2 is quickly discharged through the first drainage line 4 together with dust and slime components. As the liquid flows violently in the tank 2, the inner surface of the tank 2 is also cleaned. In addition, since the drain moves at a high speed in the first drain pipe 4, it is possible to prevent dust and slime components from adhering to the first drain pipe 4.

The supply of the liquid for pushing the drain into the tank 2 is continued until the drain in the tank 2 is completely discharged. For example, it is considered that the drain in the tank 2 is completely discharged by supplying the liquid about 2 to 5 times the capacity of the tank 2. Therefore, the liquid supply time is appropriately set in consideration of the liquid supply amount per time, and the liquid supply is stopped when the set liquid supply time is reached. The setting of the liquid supply time may be appropriately performed by an input operation to the control device 7 including a timer according to the type of the showcase, the capacity of the tank, and the like.

When the set liquid supply time has elapsed, the first drain control valve 17 is closed by a signal from the control device 7. Thereafter, at a slight time difference, the liquid supply control valve 10 is closed by a signal from the control device 7. The reason why the liquid supply control valve 10 is fully closed after being delayed from the first liquid drainage control valve 17 is to prevent a backflow from the first liquid drainage line 17 to the tank 2.

Thus, the primary drainage process by the primary drainage mechanism ends. That is, the drainage of the drain in the tank 2 and the cleaning of the inside of the tank 2 and the first drain pipe 4 are completed.

Subsequently, the process proceeds to the secondary drainage process by the secondary drainage mechanism. At the time when the first drainage step is completed, the tank 2 is full of the liquid for draining. It is the second drainage step that discharges the residual liquid from the tank 2 and makes the tank 2 substantially empty. Through the second drainage process, the next drain can be received by the tank 2.

At the end of the first drainage process, the inside and outside of the tank 2 are completely shut off gas-liquid tightly, and the tank 2 is in a sealed state. Then, the compressor 19 is operated, and the compressed air is supplied into the tank 2 by opening the air supply control valve 20, and the second drain control valve 21 is also opened. As a result, the liquid for draining out of the tank 2 is pressure-fed to the ceiling 15 through the second drainage pipe 5 and discharged to the sewer pipe 16. The start of the compressor 19, the opening operation of the air supply control valve 20, and the opening operation of the second drain control valve 21 are controlled by a signal from the control device 7.

When the water level of the liquid for draining in the tank 2 falls to the lower limit level L2, the lower limit water level sensor 22 detects this and a detection signal is sent to the control device 7. In response to this, the control device 7 sends a signal to the air supply control valve 20 and the second drain control valve 21, and these control valves are closed. Next, a signal is also sent from the control device 7 to the compressor 19, and the operation of the compressor 19 is stopped. Thus, the secondary drainage process by the secondary drainage mechanism ends.

Subsequently, a signal is sent from the control device 7 to the drain inflow control valve 6 and the atmosphere release valve 14, and these valves are opened. This causes the next drain to flow into the tank 2, and thereafter, the above-described primary drainage process and the secondary drainage process are alternately repeated.

According to the automatic drainage device 100, as a primary drainage process, the first drainage having a large diameter is performed by pumping the drain in the tank containing the dust and the slime component into the tank 2 by pressing the drainage liquid. It is forcibly discharged from the pipe 4. For this reason, it is difficult for dust and slime components to remain in the tank 2. In addition, since the inner wall of the tank 2 and the inner wall of the first drain pipe 4 are washed by the pressure feeding of the liquid for drain extrusion into the tank 2, they are kept clean. Unlike the conventional method, in the first drainage step, a pump is not used for draining the drain from the tank, so that problems such as malfunction of the pump due to dust or the like do not occur.

Further, as the secondary draining step, the draining liquid is forcibly discharged by forcing the compressed air into the tank 2 so that the draining liquid can be quickly discharged. Therefore, the state of receiving the next drain by the tank 2 is quickly established. Therefore, even if the drain is continuously generated in the showcase 1, there is no fear that the discharge of the drain is delayed.

As another embodiment, the secondary drainage step can be performed as follows. That is, a method in which the sealed state of the tank 2 is released, and the liquid for pushing out of the tank 2 is discharged using a pump (not shown). By pumping the liquid for extrusion into the tank 2 as a primary drainage step, almost all of the dust and slime components contained in the drain are discharged out of the tank. Therefore, in the second drainage process, it is considered that problems such as clogging and failure of the pump do not occur even if the pumping liquid is discharged using the pump.

In this case, the secondary drainage mechanism can be configured as follows, for example. That is, in FIG. 1, the air supply pipe 18, the air supply control valve 20, and the compressor 19 are eliminated, and a pump is provided on the second drain pipe 5. The pump 5 is connected to the control device 7 and starts or stops in response to a control signal from the control device 7. According to this embodiment, by driving the pump instead of the compressor 19, the liquid for pushing out of the tank is forcibly discharged through the second drainage line 5.

FIG. 2 shows an automatic drainage device 200 according to another embodiment. The example of FIG. 2 illustrates another embodiment of the tank 2 of FIG. 2, the same members or elements as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and overlapping descriptions will be omitted.

In the example of FIG. 2, a horizontal piping type (pipe type) tank 30 is employed instead of the box-shaped tank 2 of FIG. FIG. 2 is a view of the horizontal piping type tank 30 as viewed from above. The tank 30 is formed by horizontally arranging a large-diameter pipe, and is formed by repeatedly folding the pipe in a horizontal plane so as to secure a necessary capacity as a tank within a limited arrangement area. . The pipe-type tank 30 may be formed by connecting a number of pipes in a horizontal plane in a zigzag manner using a pipe joint, or may be formed by bending one long pipe into an appropriate shape in a horizontal plane. Is also good. The total length of the pipe is determined in relation to the diameter of the pipe so that the capacity required for the tank is secured. It is needless to say that the cross-sectional shape of the pipe need not be circular, but may be polygonal, elliptical, or the like.

An opening at one end of the horizontal piping type tank 30 is an inlet 31 and an opening at the other end is an outlet 32. The inlet 31 communicates with the showcase 1 via the drain transfer pipe 6, and the outlet 32 is a first drain pipe. It is communicated with Road 4. Thereby, the drain can be stored in the tank 30 of the horizontal piping type.

In FIG. 2, a liquid supply pipe 8 is connected to the drain transfer pipe 3, and a liquid for drain extrusion supplied through the liquid supply pipe 8 is piped from an inlet 31 to an outlet 32 of a horizontal piping type tank 30. Distribute inside. However, the liquid supply pipe 8 does not necessarily need to be connected to the drain transfer pipe 3, and may be directly connected to a position near the inlet 31 of the horizontal pipe type tank 30. It suffices that the liquid for drain extrusion supplied through the liquid supply line 8 flows through the pipe from the inlet 31 to the outlet 32 of the horizontal piping type tank 30.

In FIG. 2, the air supply line 18 is connected to the liquid supply line 8 on the downstream side of the liquid supply control valve 10 (to the side of the drain transfer pipe 3). However, the air supply pipe 18 does not necessarily need to be connected to the liquid supply pipe 8 and may be directly connected to any part of the horizontal pipe type tank 30.

In the figure, 6 is a drain inflow control valve, 11 is an upper limit water level sensor, 13 is a bypass pipe, 14 is an atmosphere release valve, 17 is a first drainage control valve, 20 is an air supply control valve, 19 is a compressor, and 22 is a compressor. It is a lower limit water level sensor. As in FIG. 1, the entire drainage device 200 is controlled by the control device 7.

As described above, in the embodiment of FIG. 2, the tank 30 of the horizontal piping type is adopted, the liquid supply pipe 8 is connected near the inlet 31 of the tank 30, and the first line is connected to the outlet 32 of the tank 30. The drain line 4 is communicated. For this reason, the horizontal piping type tank 30 has a series of horizontal flow paths 33 for the liquid for extrusion. Then, the liquid for drain extrusion supplied through the liquid supply pipe 8 flows horizontally through a series of flow paths 33 from the inlet 31 to the outlet 32 of the tank 30. As a result, the drain collected in the tank 30 is smoothly pushed out toward the first drain pipe 4.

Although not shown, a partition type tank may be employed instead of the horizontal piping type tank 30. For example, a flat box-shaped tank is arranged horizontally, a number of partitions are staggered in this tank, and a series of zigzag or meandering horizontal long flow paths are formed in the flat box-shaped tank. . Also in this case, the liquid supply line 8 is communicated near the entrance of the series of long flow paths, and the exit of the series of long flow paths is communicated with the first drainage line 4. Thereby, the same operation and effect as those of the horizontal piping type tank 30 of FIG. 2 can be obtained.

2 tank (box-shaped tank)
Reference Signs List 4 first drainage line 5 second drainage line 7 controller 8 supply line 10 supply line control valve 17 first drainage control valve 18 air supply line 20 air supply control valve 21 second Drainage control valve 30 tank (horizontal piping type tank)
31 inlet 32 outlet 33 series of horizontal channels

Claims (6)

A sealed tank for storing a liquid to be discharged containing foreign matter, and a first discharge for pumping out a liquid for pushing out until the foreign matter is no longer contained in the tank and discharging the foreign matter together with the liquid to above the tank. An automatic drainage device comprising : a liquid mechanism; and a secondary drainage mechanism that discharges the pushing liquid remaining in the tank and allows new liquid to be discharged to be received in the tank. 2. The automatic drainage device according to claim 1, wherein the foreign matter in the tank is pressure-fed to the height of the ceiling together with the liquid by the pushing liquid. 3. The automatic drainage device according to claim 1 , wherein the pressure of the extruding liquid is 0.2 megapascal or more . 4. A first drainage line configuring the primary drainage mechanism, and a second drainage line configuring the secondary drainage mechanism, wherein the first drainage line is 4. The automatic drainage mechanism according to claim 1, wherein the inside diameter is larger than the second drainage line, and the second drainage line is opened near the bottom of the tank. 5. A sealed tank for storing the liquid to be discharged, a primary drainage mechanism for discharging the liquid to be discharged from the tank by pumping the liquid for extrusion into the tank, and remaining in the tank A secondary drainage mechanism that discharges the liquid for extrusion and allows a new liquid to be discharged to be received in the tank, wherein the primary drainage mechanism is A liquid supply line for pumping the liquid for extrusion into the tank, a liquid supply control valve arranged on the liquid supply line, and a pressure supply of the liquid for extrusion into the tank. A first drain line for discharging the liquid in the tank to the outside, a first drain control valve disposed on the first drain line, the liquid supply control valve, A control device for controlling the opening and closing of the first drainage control valve, wherein the second drainage mechanism An air supply pipe for pressure-feeding air into the tank, an air supply control valve disposed on the air supply pipe, and the pushing liquid remaining in the tank into the tank. A second drainage line for discharging by pressure feeding of the air, a second drainage control valve disposed on the second drainage line, the air supply control valve, and the second A control device for controlling the opening and closing of the drainage control valve, wherein the first drainage line has a larger inner diameter than the second drainage line, and the second drainage line is the tank. An automatic drainage device that opens near the bottom of the. A first drainage step of pumping a liquid for extrusion into a closed tank and discharging a liquid containing foreign matter in the tank to above the tank until the foreign matter is no longer present in the tank; A second draining step of draining the liquid for extrusion remaining in the tank and substantially emptying the tank.

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