JP2017089995A - Automatic drainage device and drainage method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic drainage device capable of automatically discharging a liquid in a tank, especially liquid containing foreign matters, without causing failure of a pump and clogging of piping.SOLUTION: An automatic drainage device includes: a sealed tank 2 configured to store a liquid to be discharged; primary drainage mechanisms 8, 10, 4, 17, 7 configured to pump a liquid for pushing-out to the tank 2 to discharge the liquid to be discharged from the tank; and secondary drainage mechanisms 18, 20, 5, 21, 7 configured to discharge the liquid for pushing-out left in the tank 2 and be able to accept a new liquid to be discharged into the tank.SELECTED DRAWING: Figure 1

Description

The present invention relates to an automatic drain device for automatically discharging a liquid in a tank. The present invention also relates to a draining method for discharging a liquid in a tank. In particular, the automatic drainage apparatus and drainage method according to the present invention is suitable for temporarily storing a liquid containing a foreign substance that causes clogging of a pump or a pipe and discharging the liquid from the tank. Examples of the liquid containing a foreign substance include drainage generated from a showcase in a store, manure, and the like.

In the store's refrigerated / refrigerated showcase, moisture in the air in contact with the cooler condenses to form dew and frost, which generates drainage. This drain needs to be discharged outside the store.

Conventionally, as a method for discharging these drains outside the store, a pit is dug in the floor, and drainage pipes are laid down in a downward slope, and the drainage of the showcase is naturally drained outside through this drainage pipe. Was normal. However, there are cases where a showcase must be installed in a place away from the drain pipe or in a place where there is no drain pipe. In such a case, it is difficult to dig a new pit on the floor and lay drainage pipes in each case. This is especially true when the building is reinforced concrete like a department store. In view of this, it has been proposed that the drain is once guided to the tank by piping and the drain accumulated in the tank is forcibly discharged by a pump (see Patent Documents 1 and 2, etc.). At that time, a vertical pipe extending to the back of the ceiling was connected to the discharge port of the pump, and the vertical pipe was connected to the horizontal pipe at the back of the ceiling, and drainage was discharged to the outside through the horizontal pipe.

JP 2005-331171 A Japanese Patent Laid-Open No. 11-148771

However, the conventional method has the following problems. In many cases, the waste generated in the showcase is mixed with food waste peculiar to the displayed product. For example, drainage generated from vegetable showcases is likely to be mixed with vegetable leaf pieces, mud, sand, etc., and drainage generated from fresh fish showcases may include fish scales or styrofoam fragments that are the container material. Is easy to mix. In addition, drainage generated from showcases is contaminated with various organic substances and bacteria, which cause sliminess. These dust and slime components often caused pump failure and clogged piping. Furthermore, when performing maintenance on the pump and piping, the workers were troubled because they were very dirty and had a bad odor.

The present invention has been made in view of the circumstances as described above, and is capable of discharging a liquid in a tank, particularly a liquid containing a foreign substance, without causing a pump failure or clogging of a pipe, and an automatic liquid draining apparatus and a liquid drain Is to provide a method.

In order to solve the above problems, an automatic liquid draining apparatus according to the present invention includes a sealed tank for storing a liquid to be discharged, and a pumping liquid pumped into the tank to discharge the liquid to be discharged. A primary drainage mechanism for draining from the tank, and a secondary drainage mechanism for draining the liquid for extrusion remaining in the tank and allowing the new liquid to be drained to be received in the tank. (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 primary drainage mechanism. Even if the liquid to be discharged stored in the tank contains foreign matters such as dust and slime components, the dust and slime components are also forcibly discharged by the extrusion pressure of the liquid for extrusion. Further, the extrusion pressure of the liquid for extrusion also has an effect of cleaning the inner wall of the tank and the inner wall of the drainage conduit. Since the primary drainage mechanism does not use a pump, problems such as pump failure do not occur. In addition, as the liquid for extrusion, the liquid which does not contain a foreign material is used.

After all of the liquid in the tank has been replaced by the liquid for extrusion, the pumping of the liquid for extrusion into the tank is stopped. And the liquid for extrusion which remained in the tank is discharged | emitted by a secondary drainage mechanism. Since the tank is substantially emptied by the secondary drainage mechanism, new liquid to be drained can be received in the tank.

As a preferred embodiment, the primary drainage mechanism includes a liquid supply line for pumping the liquid for extrusion into the tank, and a liquid supply control disposed on the liquid supply line. A valve, a first drainage line for discharging the liquid in the tank to the outside by pumping the liquid for extrusion into the tank, and a first drainage line disposed on the first drainage line An embodiment including a first drainage control valve, a control device that controls opening and closing of the liquid supply control valve and the first drainage control valve is exemplified (Claim 2).

In this case, when the liquid supply control valve and the first drainage control valve are opened by a signal from the control device, the liquid for extrusion is pumped through the liquid supply line into the sealed tank. As a result, the water pressure in the tank rises and the liquid to be discharged in the tank is discharged through the first drain line. When the liquid supply control valve and the first drainage control valve are closed by a signal from the control device, the discharge of the liquid in the tank is stopped.

As a preferred embodiment, the secondary drainage mechanism includes an air supply conduit for pumping air into the tank, an air supply control valve disposed on the air supply conduit, A second drain line for discharging the liquid for extrusion remaining in the tank by pumping the air into the tank; and a second drain line disposed on the second drain line A mode provided with a drainage control valve, a control device which controls opening and closing of the air supply control valve and the second drainage control valve is illustrated (Claim 3).

In this case, when the air supply control valve and the second drainage control valve are opened by a signal from the control device, air is pumped through the air supply line into the sealed tank. As a result, the internal pressure of the tank increases, and the liquid for extrusion in the tank is discharged through the second drainage conduit. When the air supply control valve and the second drainage control valve are closed by a signal from the control device, the discharge of the liquid in the tank is stopped.

As a preferred embodiment, the primary drainage mechanism includes a liquid supply line for pumping the liquid for extrusion into the tank, and a liquid supply control disposed on the liquid supply line. A valve, a first drainage line for discharging the liquid in the tank to the outside by pumping the liquid for extrusion into the tank, and a first drainage line disposed on the first drainage line A first drainage control valve, a controller for controlling opening and closing of the liquid supply control valve and the first drainage control valve, and the second drainage mechanism supplies air into the tank. An air supply line for pumping, an air supply control valve disposed on the air supply line, and the liquid for extrusion remaining in the tank are discharged by pumping the air into the tank. And a second drainage control valve disposed on the second drainage line, and the air supply. A control device for controlling the opening and closing of the control valve and the second drainage control valve, wherein the first drainage pipe has a larger inner diameter than the second drainage pipe, An example in which the drainage pipe is open near the bottom of the tank will be exemplified.

In this case, the liquid to be discharged is discharged through the first drainage pipe having a large inner diameter. Therefore, even if the liquid to be discharged contains dust, slime components, or the like, a problem such as clogging of the first drainage pipe does not occur. The primary drainage mechanism completely pushes out dust and slime in the tank to the outside. For this reason, there is no dust or slime in the extrusion liquid remaining in the tank. Therefore, when the liquid for extrusion is discharged from the tank by air pressure feeding in the secondary drainage mechanism, the second drainage conduit has a large inner diameter as in the first drainage conduit. There is no need to use anything.

As a preferred embodiment, the tank forms a series of horizontal flow paths having an inlet and an outlet at both ends, the liquid supply pipe line communicates with the inlet, and the first drain is connected to the outlet. An example in which the liquid conduit is communicated will be exemplified (claim 5). In this case, the liquid for extrusion flows in a series of horizontal flow paths from the inlet toward the outlet. That is, a one-way flow can be made by the liquid for extrusion in the tank. For this reason, the liquid to be discharged in the tank is efficiently discharged to the outside.

The drainage method according to the present invention includes a primary drainage step in which a liquid for extrusion is pumped into a sealed tank to discharge the liquid in the tank, and the liquid for extrusion remaining in the tank. And a second drainage step for substantially emptying the tank (Claim 6).

It is a fluid and control circuit diagram of an automatic drainage device concerning one embodiment of the present invention. It is the fluid and control circuit diagram of the automatic drain apparatus which concerns on other 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 use of the automatic liquid draining device according to the present invention is not limited to the drainage generated from the showcase. The automatic liquid draining apparatus according to the present invention can be widely applied to discharge of liquids containing foreign matters that cause clogging of pipes and pumps such as other drains, sewage, and manure.

As shown in FIG. 1, an automatic drain device 100 according to an embodiment of the present invention includes a sealed box-shaped tank 2 that stores 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 this drain transfer pipe 3, the drain generated in the showcase 1 naturally flows 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 a plurality of showcases, and these drain transfer pipes 3 communicate with a single drain collecting pipe (not shown). The single tank 2 may be connected.

In the present embodiment, the liquid in the tank is discharged by two types of discharge methods having different modes. As the first draining step, when the drain is accumulated in the tank 2, the tank 2 is sealed, and the drain pushing liquid is pumped into the sealed tank 2 so that the drain accumulated in the tank 2 is discharged. The liquid is forcibly discharged through one drainage line 4. As a result, the drain in the tank 2 is discharged, but the drain pushing liquid remains in the tank 2. Therefore, as a secondary draining step, air is forced into the sealed tank 2 to forcibly drain the drain push-out liquid remaining in the tank 2 through the second drainage pipe 5. .

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

A drain inflow control valve 6 that controls the inflow of drain from the showcase 1 to the tank 2 is disposed on the drain transfer pipe 3. As the drain inflow control valve 6, for example, an electric valve is employed as an automatic valve suitable for increasing the diameter. The drain inflow control valve 6 is always open when the drain is received by the tank 2, 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 overall operation of the automatic drain device 100. In the closed state, the drain inflow control valve 6 shuts between the showcase 1 and the tank 2 in a gas-liquid tight manner.

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

A liquid supply line 8 is connected to the drain transfer pipe 3 on the downstream side of the drain inflow control valve 6. The liquid supply pipe line 8 may be piped so as to be directly connected to the tank 2. The liquid supply pipe line 8 is a pipe line for pumping the liquid for pushing out the drain into the tank 2. The liquid supply pipe 8 is piped upward, is piped horizontally at the ceiling 15, and communicates with a water pipe 9 as a pressurized water supply source. As the pressurized water supply source, in addition to the water pipe, a pump communicating with an appropriate water source may be employed. As the draining liquid, rainwater or groundwater stored in a water storage tank can be used instead of tap water. This saves water bills. As the liquid for extruding the drain, a liquid that does not contain foreign substances that cause clogging of the pipe is used.

A liquid supply control valve 10 that is normally closed is provided on the liquid supply pipe line 8 except during liquid supply. 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 shuts off the pressurized water supply source 9 and the tank 2 in a gas-liquid tight manner.

An upper limit water level sensor 11 such as a float type or an electrode rod type that detects the upper limit L1 of the water level in the tank 2 is disposed in the upper part of the tank 2. The sensor 11 emits 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 the full water 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 disposed in a cylindrical cover 12 extending in the vertical direction so as to be movable up and down. The cylindrical cover 12 protects the upper limit water level sensor 11 from the spill of the liquid in the tank 2 when supplying the liquid for pushing out the drain. A bypass pipe 13 for communicating the inside of the tank 2 with the atmosphere is provided at the closed upper portion of the cylindrical cover 12, and the 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 air release valve 14 is connected to the control device 7 and is closed only when drainage or liquid in the tank 2 is forcibly discharged in response to a control signal from the control device 7. As the atmosphere release valve 14, for example, an electromagnetic valve is used as an automatic valve suitable for high-speed operation. In the closed state, the air release valve 14 shuts the inside and outside of the tank 2 in a gas-liquid tight manner. When an electrode bar type sensor is used instead of the float type sensor, the cylindrical cover 12 is not necessary. In this case, a pipe for releasing the atmosphere may be provided in the upper part of the tank 2 and an air release valve may be provided at the tip of the pipe.

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

When the liquid for extrusion is pumped into the tank 2 through the liquid supply pipe 8, the drain in the tank 2 is forcibly discharged through the first drain pipe 4. In many cases, the drain discharged through the first drainage pipe 4 contains dust corresponding to the articles displayed in the showcase 1. These dusts pass through the first drainage control valve 17 and the first drainage conduit 4 while being contained in the drain. For this reason, it is preferable that the first drainage control valve 17 and the first drainage conduit 4 have large diameters from the viewpoint of preventing clogging of dust.

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

A compressor 19 is communicated with 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 that controls the supply of compressed air into the tank 2 is disposed on the air supply line 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, receives a control signal from the control device 7, and is opened only when air is supplied to the tank 2. As the air supply control valve 20, for example, an electromagnetic valve is used as an automatic valve suitable for high-speed operation. In the closed state, the air supply control valve 20 shuts off the inside and outside of the tank 2 in a gas-liquid tight manner.

Near the bottom of the tank 2, a second drain line 5 for discharging the drain pushing liquid remaining in the tank 2 is connected. The second drainage pipe 5 is piped toward the ceiling back 15 in the same manner as the first drainage pipe 4, is piped sideways at the ceiling back 15, and communicates with the sewer pipe 16. A second drainage control valve 21 that is normally closed is disposed on the second drainage pipe line 5 except when the draining liquid is forcibly drained. The second drainage control valve 21 is connected to the control device 7 and receives the control signal from the control device 7 and is opened only when the liquid for extrusion is forcibly drained. As the second drainage 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 drainage control valve 21 shuts the inside and outside of the tank 2 in a gas-liquid tight manner.

By pumping the air through the air supply pipe 18 into the sealed tank 2, the drain push liquid remaining in the tank 2 is forcibly discharged through the second drain pipe 5. The second drain line 5 preferably has a smaller inner diameter than the first drain line 8. This is because the drain pushing liquid remaining in the tank 2 can be quickly discharged at high pressure by supplying air.

A lower limit water level sensor 22 such as a float type that detects the lower limit L2 of the water level in the tank 2 is disposed in the lower part of the tank 2. The sensor 22 generates a signal when the water level in the tank 2 reaches a predetermined lower limit level L2 due to the discharge of the drain pushing liquid. The lower limit water level sensor 22 is connected to the control device 7, and the 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 air 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 are Both are closed. Since the air 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 cylindrical cover 12 issues a full signal. This full water signal is input to the control device 7, and a signal for closing the drain inflow control valve 6 is output from the control device 7. Thus, 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. Thus, when the air release valve 14 is closed, the liquid supply control valve 10 is opened thereafter. As a result, the drain pushing liquid is pumped through the liquid supply line 10 into the sealed tank 2, and the water pressure in the tank 2 rises. Slightly after the liquid supply control valve 10 is opened, the first drainage control valve 17 is opened by a signal from the control device 7. As a result, the drain in the tank 2 is suddenly pushed out toward the ceiling back 15 through the first drainage pipe 4 and discharged from the ceiling back 15 toward the sewer pipe 16.

The first drainage control valve 17 opens slightly later than the liquid supply control valve 10 because the water pressure in the tank 2 is sufficiently increased by the start of the supply of the extrusion liquid, and then the first drainage control valve 17. It is because the direction which opens can reliably prevent that the dust which may remain in the 1st drainage pipe line 4 flows back into the tank 2. FIG. The time difference that the first drainage control valve 17 opens later than the liquid supply control valve 10 may be set appropriately according to the water pressure of the pressurized water supply source 9 or the like.

The pressure of the liquid for extruding drain supplied to the tank 2 through the liquid supply pipe 8 is preferably 0.2 megapascals or more. This means that the water head pressure is about 20 m or more. Therefore, even if the height to the ceiling 23 is 10 m, the drain in the tank 2 can be reliably discharged through the ceiling back 15. The water pressure standards in Japan are uniform throughout the country, but the lower limit is 0.15 megapascal, the upper limit is 0.74 megapascal, and the ideal water pressure is 0.2 to 0.39 megapascal. Has been. Therefore, the drain of the showcase installed on the floor can be sufficiently discharged to the back of the ceiling with the water pressure even if the ceiling height is 10 m. As described above, as a water source, rainwater can be collected and used, or groundwater can be pumped up and used. In these cases, the pressure is appropriately increased by a pump.

By draining the liquid for pushing out the drain into the tank 2 through the liquid supply line 8, the drain in the tank 2 is discharged through the first drain line 4 with the dust and slime components. When the liquid flows vigorously in the tank 2, the inner surface of the tank 2 is also cleaned. Further, since the drain moves at a high speed in the first drainage conduit 4, it is possible to prevent dust and slime components from adhering to the first drainage conduit 4.

The supply of the liquid for pushing out 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 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 hour, and the liquid supply is stopped when the set liquid supply time is reached. The liquid supply time may be set appropriately 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 drainage control valve 17 is closed by a signal from the control device 7. Thereafter, the liquid supply control valve 10 is closed by a signal from the control device 7 with a slight time difference. The reason why the liquid supply control valve 10 is delayed from the first drainage control valve 17 to be fully closed is to prevent the backflow from the first drainage pipe 17 to the tank 2.

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

Then, it moves to the secondary drainage process by the secondary drainage mechanism. At the time when the first draining process is completed, the tank 2 is full of the draining liquid. The secondary draining step is to discharge the residual liquid from the tank 2 to substantially empty the tank 2. By passing through this secondary draining step, 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 gas-liquid sealed and the tank 2 is in a sealed state. Therefore, the compressor 19 is operated and the air supply control valve 20 is opened to supply compressed air into the tank 2 and, at the same time, the second drainage control valve 21 is opened. As a result, the draining liquid in the tank 2 is pumped 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 drainage control valve 21 are controlled by signals from the control device 7.

When the water level of the draining liquid 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 drainage control valve 21 so that 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 draining process by the secondary draining mechanism is completed.

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. Thereby, inflow of the next drain into the tank 2 starts, and after that, the primary drainage step and the secondary drainage step already described are alternately repeated.

According to the automatic drain apparatus 100, as the first drain process, the drain in the tank containing dust and slime components is a first drain liquid having a large diameter by pumping the drain push liquid into the tank 2. It is forcibly discharged from the pipeline 4. For this reason, dust and slime components hardly remain in the tank 2. Moreover, since the inner wall of the tank 2 and the inner wall of the first drainage pipe 4 are washed by pumping the liquid for pushing out the drain into the tank 2, they are kept clean. Unlike the conventional method, since the pump is not used for draining from the tank in the first draining process, there is no problem that the pump malfunctions due to dust or the like.

Also, as the secondary draining step, the drain pushing liquid is forcibly discharged by pumping compressed air into the tank 2, so that the drain pushing liquid can be quickly discharged. Therefore, the next drain is ready to be received by the tank 2 quickly. Therefore, even if the drain is continuously generated in the showcase 1, there is no concern that the drain discharge is delayed.

As another embodiment, the secondary draining step can be performed as follows. In other words, after the sealed state of the tank 2 is released, the liquid for extrusion in the tank 2 is discharged using a pump (not shown). By sending the liquid for extrusion into the tank 2 as the first draining step, almost all dust and slime components contained in the drain are discharged out of the tank. Therefore, in the secondary drainage process, it is considered that problems such as clogging or failure of the pump do not occur even if the liquid for extrusion is discharged using the pump.

The secondary drainage mechanism in this case can be configured as follows, for example. That is, in FIG. 1, the air supply line 18, the air supply control valve 20, and the compressor 19 are eliminated, and a pump is disposed on the second drainage line 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, the pump is driven instead of the compressor 19 so that the liquid for extrusion in the tank is forcibly discharged through the second drainage pipe 5.

FIG. 2 shows an automatic drain device 200 according to another embodiment. The example of FIG. 2 illustrates another aspect of the tank 2 of FIG. In FIG. 2, the same members or elements as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

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. 1. FIG. 2 is a view of the horizontal piping tank 30 as viewed from above. The tank 30 is a horizontally arranged pipe having a large diameter, 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 large number of pipes in a zigzag manner in a horizontal plane using pipe joints, or by forming a single long pipe by bending it into an appropriate shape in the horizontal plane. Also good. The total length of the pipe is determined in relation to the diameter of the pipe so as to secure the necessary capacity as a tank. Of course, the cross-sectional shape of the pipe need not be circular, but may be polygonal, elliptical, or the like.

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

In FIG. 2, the liquid supply pipe 8 is connected to the drain transfer pipe 3, and the draining liquid supplied through the liquid supply pipe 8 is piped from the inlet 31 to the outlet 32 of the horizontal piping tank 30. Circulate inside. However, the liquid supply line 8 is not necessarily connected to the drain transfer pipe 3 and may be directly connected to a position close to the inlet 31 of the horizontal piping type tank 30. It is only necessary that the liquid for extruding the drain supplied through the liquid supply pipe 8 flows through the pipe from the inlet 31 to the outlet 32 of the horizontal piping tank 30.

In FIG. 2, the air supply pipe 18 is connected to the liquid supply pipe 8 on the downstream side (drain transfer pipe 3 side) of the liquid supply control valve 10. However, the air supply line 18 is not necessarily connected to the liquid supply line 8, and may be directly connected to any part of the horizontal piping 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 air release valve, 17 is a first drainage control valve, 20 is an air supply control valve, 19 is a compressor, 22 is 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 horizontal piping type tank 30 is adopted, the liquid supply pipe line 8 is communicated near the inlet 31 of the tank 30, and the first outlet 32 is connected to the outlet 32 of the tank 30. The drainage conduit 4 is communicated. For this reason, the horizontal piping tank 30 has a series of horizontal flow paths 33 of the liquid for extrusion. The drain extrusion liquid supplied through the liquid supply pipe 8 circulates horizontally through the series of flow paths 33 from the inlet 31 to the outlet 32 of the tank 30. Thereby, the drain accumulated in the tank 30 is smoothly pushed out toward the first drainage pipe line 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 horizontally arranged, and a large number of partitions are staggered in the tank to form a series of long horizontal channels that are zigzag or twisted in the flat-box tank. . Also in this case, the liquid supply line 8 is communicated with the vicinity of the inlet of the series of long channels, and the outlet of the series of long channels is communicated with the first drainage line 4. Thereby, the effect similar to the horizontal piping type tank 30 of FIG. 2 is show | played.

2 Tank (box-shaped tank)
4 First drainage line 5 Second drainage line 7 Control device 8 Supply line 10 Supply liquid control valve 17 First drain control valve 18 Air supply line 20 Air supply control valve 21 Second Drainage control valve 30 tank (horizontal piping tank)
31 Inlet 32 Outlet 33 A series of horizontal flow paths

The pressure of the liquid for extruding drain supplied to the tank 2 through the liquid supply pipe 8 is preferably 0.2 megapascals or more. This means that the water 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 up and used. In these cases, the pressure is appropriately increased by a pump.

Claims (6)

A sealed tank for storing the liquid to be discharged, a primary drainage mechanism for pumping the liquid for extrusion into the tank and discharging the liquid to be discharged from the tank, and the tank remaining in the tank An automatic drainage mechanism, comprising: a secondary drainage mechanism that discharges the liquid for extrusion and allows a new liquid to be discharged to be received in the tank. The primary drainage mechanism includes a liquid supply line for pumping the liquid for extrusion into the tank, a liquid supply control valve disposed on the liquid supply line, and a supply to the tank. A first drainage pipe 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 pipe; The automatic drainage device according to claim 1, further comprising: 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 line for pumping air into the tank, an air supply control valve disposed on the air supply line, and the push-out valve remaining in the tank. A second drainage conduit for discharging the liquid by pumping the air into the tank, a second drainage control valve disposed on the second drainage conduit, and the air The automatic drainage device according to claim 1, comprising a supply control valve and a control device that controls opening and closing of the second drainage control valve. The primary drainage mechanism includes a liquid supply line for pumping the liquid for extrusion into the tank, a liquid supply control valve disposed on the liquid supply line, and a supply to the tank. A first drainage pipe 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 pipe; A control device that controls opening and closing of the liquid supply control valve and the first drainage control valve, and the second drainage mechanism is an air supply line for pumping air into the tank And an air supply control valve disposed on the air supply pipe, and a second drainage pipe for discharging the pushing liquid remaining in the tank by pumping the air into the tank A second drainage control valve disposed on the second drainage conduit, the air supply control valve, and the second drainage control A control device for controlling opening and closing of the first drainage pipe, wherein the first drainage pipe has a larger inner diameter than the second drainage pipe, and the second drainage pipe is located near the bottom of the tank. The automatic liquid draining device according to claim 1, which is open. The tank forms a series of horizontal flow paths having an inlet and an outlet at both ends, the liquid supply pipe is communicated with the inlet, and the first drainage pipe is communicated with the outlet. The automatic liquid draining device according to claim 2. A primary draining step in which the liquid for extrusion is pumped into a sealed tank to discharge the liquid in the tank; and the liquid for extrusion remaining in the tank is discharged to substantially remove the tank. And a secondary drainage step for emptying.

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