JP2020118326A - Drain discharge device - Google Patents

Abstract

To provide a drain discharge device capable of lifting drain water without using a lifting pump.SOLUTION: In a drain discharge device 80, the inside of a storage part 32 is pressurized by an air suction supply part 40, a pressure of lift piping 34 is reduced by a sucking operation from the side of suction piping 48b, and drain water stored in the storage part 32 is lifted by these so-called push-pull operations. Therefore, drain water is lifted to a high place with relatively small energy. Further, it is not necessary to use direct water feed means such as a lifting pump, and drain water does not flow down to a drive facility. Thus, dirt or clogging is prevented from occurring by stagnation of drain water in a drive system, and a load of maintenance wok is remarkably reduced.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drain drainage device that pumps up drain water discharged from a cooling facility and discharges it to a drain pipe provided above.

For example, refrigerating and freezing showcases that store products in a frozen or refrigerated state are often used in commercial facilities, stores, and the like that handle food and the like. In such a cooling facility such as a refrigerating/freezing showcase, frost or the like is iced on the surface portion of the cooling pipe or the cooling mechanism, which causes a decrease in cooling efficiency. Therefore, many of these cooling facilities have a function of periodically melting and removing frost or the like that has frozen. Then, water generated by melting frost or the like is collected as drain water and appropriately discharged. Further, dew condensation water on the cooling coil or the like, drainage water at the time of cleaning, etc. are similarly discharged as drain water. Here, for example, the following [Patent Document 1] discloses an invention relating to a drain recovery device including an auxiliary tank for storing drain water and a drain tank on a base of a refrigerating/freezing showcase.

However, in the invention described in [Patent Document 1], it is necessary for a person to periodically discard the drain water in the tank. In response to this problem, there are many cooling facilities in which a drainage channel or drainage pipe is provided under the floor and drain water is discharged to the drainage channel or drainage pipe. However, with the configuration that the drainage ditch and drainage pipe are provided under the floor, it is necessary to construct a new drainage ditch and drainage pipe when moving the cooling equipment, and sometimes large-scale construction is required. There is a problem that the degree of freedom of layout change is low.

JP, 10-281626, A

To solve this problem, a method is conceivable in which drain water discharged from the cooling equipment is pumped by a pump and drained through a drain drainage pipe arranged above. With this configuration, since the drain drainage pipe is installed above, it is possible to easily change the route of the drainage pipe or reconstruct it as compared with the case where it is installed under the floor. As a result, it is possible to move the cooling equipment and change the layout with a high degree of freedom.

However, the amount of drain water is small compared to the capacity of the pump, and thus the pump has a long standby time. For this reason, the drain water stays in the drive equipment of the pump, which may cause dirt, clogging, and breakdown. Further, in the configuration in which drain water flows down in the drive equipment, there is a problem that maintenance of the pipe is difficult to perform and the load of maintenance work is large.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drain drainage device capable of pumping drain water without using a pump.

The present invention is
(1) A drain drainage device for pumping drain water discharged from a drain pipe 12 provided in a cooling facility 10 to a drain drain pipe 14 provided above,
A lower backflow prevention member 30a that is connected to the drain pipe 12 and prevents a backflow of the drain water to the cooling facility 10 side; and a storage section 32 that is connected to the drain pipe 12 via the lower backflow prevention member 30a. A pumping pipe 34 which is connected to the storage part 32 and extends upward, an air separating part 36 which is installed above the pumping pipe 34 and separates air in the pumping pipe 34, the pumping pipe 34 and the drain drainage pipe. 14, an upper backflow prevention member 30b for preventing backflow of drain water to the storage part 32 side, and air in the pumping pipe 34 from the air separation part 36 is sucked into the storage part 32. An air suction supply section 40 for sending air under pressure, wherein the air suction supply section 40 sucks air from the pumping pipe 34 and sends air to the storage section 32 to drain water stored in the storage section 32. The above problem is solved by providing a drain drainage device 80 characterized by pumping water through the pumping pipe 34.
(2) An air pressure feeding unit 50 for feeding compressed air to the air suction supply unit 40 is further provided,
The air suction supply unit 40 includes a narrow portion 44 therein, and a vacuum is generated to suck air from the air separation portion 36 by negative pressure when the compressed air from the air pressure feeding portion 50 passes through the narrow portion 44. The above problem is solved by providing a drain drainage device 80 according to (1), which is a device.

The drain drainage device according to the present invention pressurizes the inside of the storage portion by the air suction supply portion and depressurizes the pumping pipe by the suction operation, and pumps the drain water stored in the storage portion. Therefore, drain water can be pumped up with relatively little energy. Further, it is not necessary to use a direct water supply means such as a pump for pumping, and drain water does not flow down to the drive equipment. Therefore, the drive system does not become dirty or clogged due to the retention of drain water, and the load of maintenance work can be reduced.

It is a schematic block diagram of the drain drainage apparatus which concerns on this invention. It is a schematic sectional drawing of the air suction supply part of the drain drainage apparatus which concerns on this invention.

A drainage device according to the present invention will be described with reference to the drawings. A drain drainage device 80 according to the present invention shown in FIG. 1 pumps drain water discharged from a drain pipe 12 provided in a cooling facility 10 to a drain drain pipe 14 provided above the drain pipe 12. A lower backflow prevention member 30a connected to the storage section 32, a storage section 32 connected to the drain pipe 12 via the lower backflow prevention member 30a, a pumping pipe 34 connected to the storage section 32 and extending upward, and a pumping pipe 34. Installed in the upper part of the pump to separate air in the pumping pipe, an upper backflow prevention member 30b provided between the pumping pipe 34 and the drain drainage pipe 14, and air is sucked from the air separator 36. In addition, it has an air suction supply unit 40 that sends air to the storage unit 32 under pressure, and a control unit (not shown).

The cooling facility 10 is not particularly limited, and can be applied to any refrigerating facility or refrigerating facility having a drain pipe 12 or a drain outlet 12a in addition to a refrigerating facility or a freezer showcase for displaying food and drink. .. Further, the present invention is suitable for the cooling equipment 10 capable of moving such as layout change, but is not particularly limited to this, and if the drain drainage pipe 14 is constructed above, a stationary freezer compartment, It can also be applied to the cooling equipment 10, such as a refrigerating room, a freezer, and a large refrigerator.

Further, the storage section 32 is for temporarily storing the drain water discharged from the cooling equipment 10, and any one may be used as long as it has a certain volume. However, since the storage section 32 basically causes the drain water discharged from the cooling equipment 10 to flow in by natural flow, the storage section 32 is at a position equal to or lower than the drain pipe 12 and the drain outlet 12a. The storage unit 32 may be provided on the floor where the cooling facility 10 is installed, or may be provided below the floor when there is a space under the floor. Even when the storage section 32 is provided under the floor, the stored drain water is pumped up and discharged through the drain drain pipe 14 located above, so there is no need to construct a drainage path under the floor and the installation can be performed relatively easily. .. In addition, when the storage section 32 is provided on the floor, the storage section 32 allows the drain water to flow in by natural flow as described above, so that a low profile is required especially when the drain outlet 12a of the cooling equipment 10 is located below. Is preferable, and it is particularly preferable to use a pipe member such as a prism or a cylinder. Further, the water level measuring means 20 for acquiring the water level of the drain water is provided in the storage part 32, and the drain drainage device 80 pumps up the water when the water level of the drain water in the storage part 32 exceeds a preset operation threshold value. It is preferable to configure so.

Then, the drain pipe 12 is connected to the storage portion 32 via the lower backflow prevention member 30a. The lower backflow prevention member 30a is for preventing drain water of the storage section 32 from flowing back to the cooling equipment 10 side by pressurizing air to the storage section 32, and is a known check valve such as a check valve. A valve can be used.

Further, a pumping pipe 34, which has one end located near the bottom of the reservoir 32 and extends upward, is connected to the reservoir 32. An air separating portion 36 is provided on the other end side of the pumping pipe 34, and is connected to the drain drain pipe 14 arranged, for example, under the ceiling via the upper backflow prevention member 30b. The other end of the drain drainage pipe 14 is connected to a predetermined drainage facility 16 such as a drainage channel, a drainage port, and a drainage tank. The air separation unit 36 is a gas-liquid separation mechanism that separates gas (air) and liquid (drain water) in the pumping pipe 34, and a well-known air vent valve or the like can be used. Further, as the upper backflow prevention member 30b, a well-known check valve such as a check valve can be used similarly to the lower backflow prevention member 30a described above.

Further, the drain drainage device 80 according to the present invention is provided with the air suction supply unit 40 as its characteristic configuration. Any air suction supply unit 40 may be used as long as it is capable of sucking and pressure feeding air, but a well-known vacuum generator that simultaneously sucks air and pressure feeding (discharging) by compressed air is used. Is particularly preferable. In this case, the drain drainage device 80 has a well-known air pressure feeding unit 50 such as an air compressor that delivers compressed air to the air suction supply unit 40. Further, in the configuration in which the vacuum generating device is used for the air suction/supply unit 40, the suction and the pressure feeding of the air can be achieved by one member, so that the piping route can be simplified and the device scale can be reduced. Further, since various sizes and specifications of the vacuum generator are commercially available, it is possible to obtain the air suction/supply unit 40 having an appropriate size and ability relatively easily.

Here, a schematic cross-sectional view of the vacuum generator (air suction supply unit 40) is shown in FIG. The air suction supply unit 40 as a vacuum generator includes a supply port 42a to which compressed air is supplied, a narrow section (nozzle section) 44 through which the compressed air passes, and a diffuser section 46 located downstream of the narrow section 44. It has a suction port 42b for sucking air by negative pressure generated when the compressed air passes through the narrow portion 44, and an exhaust port 42c for discharging the supplied compressed air and the sucked air. A compressed air pipe 48a extending from the air pressure feeding unit 50 is connected to the supply port 42a, a suction pipe 48b extending from the air separating unit 36 is connected to the suction port 42b, and a pressure adjusting means 52 is connected to the exhaust port 42c. An air supply pipe 48c extending to is connected. The pressure adjusting means 52 is for adjusting the pressure of the air supplied to the reservoir 32, and a well-known member such as a regulator can be used.

Then, the pressure adjusting means 52 and the reservoir 32 are connected via the air supply pipe 48d. A compressed air pipe 48a and an air supply pipe 48c before and after the air suction supply unit 40 are provided with auxiliary tanks for buffering sudden changes in the air pressure due to the start and stop of the air pressure feeding unit 50 and the load change of the storage unit 32. May be. Further, the compressed air pipe 48a and the air supply pipe 48d are provided with opening/closing valves 54a and 54b whose opening/closing is controlled by the control unit. The opening/closing valve 54b may be provided in the pressure adjusting means 52.

Next, the operation of the drain drainage device 80 according to the present invention will be described. First, in normal times, the drainage drainage device 80 is in a standby state, the air pumping unit 50 is stopped, the open/close valve 54a is closed, and the open/close valve 54b is open. Therefore, the inside of the reservoir 32 is at normal pressure. Next, when drain water is generated in the cooling equipment 10, this drain water flows into the storage section 32 through the drain pipe 12 and is stored therein. The water level measuring means 20 acquires the water level of the drain water at this time. Next, when the drain water collects in the storage section 32 and the water level exceeds a preset operation threshold value, the control section closes the open/close valve 54b to the closed state and opens the open/close valve 54a to the open state. .. It should be noted that the control unit preferably causes the pumping operation to be performed even when the water level of the storage unit 32 does not exceed the operation threshold value when the preset standby time has elapsed. With this configuration, even if the amount of drain water generated is small, the drain water stored can be discharged by periodically performing the pumping operation, and long-term retention of the drain water in the storage section 32 can be prevented. Further, even when a problem occurs in the water level measuring means 20, it is possible to prevent water leakage due to full water. The drain drainage device 80 may be operated at a preset date and time or at a predetermined time interval by a timer or the like without using the water level measuring means 20.

Next, the control unit operates the air pressure feeding unit 50. As a result, the compressed air is delivered to the supply port 42a of the air suction/supply unit 40 through the compressed air pipe 48a. The compressed air delivered to the supply port 42a is throttled by the narrow portion 44 and is jetted at high speed to the diffuser portion 46 on the downstream side. Then, a negative pressure is generated during this high-speed injection. This negative pressure sucks the inside of the pumping pipe 34 through the suction pipe 48b connected to the suction port 42b and the air separation unit 36. At this time, since the upper backflow prevention member 30b closes the drain drainage pipe 14 side, the pumping pipe 34 suctions the storage part 32 side. Further, the air injected to the diffuser portion 46 is sent to the pressure adjusting means 52 through the exhaust port 42c and the air supply pipe 48c, and after being adjusted to a predetermined pressure by the pressure adjusting means 52, the storage portion is passed through the air supply pipe 48d. It is pumped to 32. At this time, since the lower backflow prevention member 30a closes the drain pipe 12 side, the air from the air supply pipe 48d pressurizes the inside of the storage portion 32. As a result, the inside of the reservoir 32 is pressurized by the air from the air supply pipe 48d, and the pumping pipe 34 is depressurized by the suction operation from the side of the suction pipe 48b. The stored drain water is pumped by the pumping pipe 34. The pumped drain water does not pass through the air separation section 36 and is sent to the drain drainage pipe 14 through the upper backflow prevention member 30b. Then, it is discharged to the drainage facility 16 through the drain drainage pipe 14. Further, the air trapped in the pumping pipe 34 passes through the air separating unit 36, is sucked by the air supply pipe 48 c, and is then sent to the air suction supply unit 40.

Here, since the drainage drainage device 80 according to the present invention pumps water by the push-pull method by pressurization and suction by air as described above, it is possible to pump water to a high place even at an extremely low pressure. For example, in an experiment using the pumping pipe 34 having an internal shape of 25 mm, it was possible to pump water with a discharge pressure of the pressure adjusting means 52 of 0.1 MPa and a height of 8 m.

Then, when the above-described pumping operation is performed for a preset time, for example, the control unit stops the air pressure feeding unit 50, closes the opening/closing valve 54a, and opens the opening/closing valve 54b. As a result, the air supply to the reservoir 32 and the air suction from the pumping pipe 34 are stopped, and the inside of the reservoir 32 becomes a normal pressure by opening the on-off valve 54b. As a result, the drain drainage device 80 stops the pumping operation and enters the standby state. The operation time of the pumping operation of the drain drainage device 80 is set in advance by experiments or the like to obtain a sufficient time for discharging all the drain water in the storage section 32.

Further, when there are a plurality of cooling facilities 10 and each of the storage sections 32 is provided, the compressed air pipe 48a is branched and a flow path switching means such as an on-off valve 54a is provided for each, and the control section is provided with the flow path switching means. The air pumping unit 50 may be shared by a plurality of drain drainage devices 80 by appropriately opening and closing.

As described above, the drain drainage device 80 according to the present invention pumps up drain water and discharges it to the drainage facility 16 through the upper portion of the ceiling or the like. Therefore, large-scale construction such as excavation under the floor is not required, and the cooling facility 10 can be easily moved or the layout can be changed.

Further, the drain drainage device 80 according to the present invention pumps up drain water by a push-pull method by pressurization and suction by air. Therefore, drain water can be pumped up to a high place with relatively little energy. Further, since the drain water is pumped by using air, it is not necessary to use a direct water feeding means such as a pump, and the drain water does not flow down to the driving equipment such as the air compressor. Therefore, the drive system does not become dirty or clogged due to the retention of drain water, and the drain water does not flow down to the drive system, so that the load of maintenance work can be greatly reduced.

Further, in the drainage drainage device 80 according to the present invention, by using the vacuum generating device for the air suction/supply unit 40, it is possible to configure pressurization and suction by air with one compact member. As a result, the device configuration can be simplified and downsized.

The configuration, mechanism, shape, size, operation, piping path, etc. of each part of the drainage drainage device 80 shown in this example are merely examples, and are not particularly limited to this example. Modifications can be made without departing from the scope of the invention.

10 Cooling equipment
12 drain piping
14 Drain drainage pipe
30a Lower backflow prevention member
30b Upper backflow prevention member
32 Storage
34 Pumping pipe
36 Air separation unit
40 Air suction supply unit
44 Narrow space
50 Air pressure feeding section
80 drainage system

Claims (2)

A drain drainage device for pumping drain water discharged from a drain pipe provided in a cooling facility to a drain drain pipe provided above,
A lower backflow preventing member that is connected to the drain pipe to prevent backflow of the drain water to the cooling equipment side,
A storage part connected to the drain pipe via the lower backflow prevention member,
A pumping pipe connected to the storage section and extending upward,
An air separation unit installed on the upper part of the pumping pipe to separate the air in the pumping pipe,
An upper backflow prevention member that is provided between the pumping pipe and the drain drainage pipe to prevent backflow of drain water to the reservoir side,
An air suction supply unit that sucks the air in the pumping pipe from the air separation unit and pressure-feeds the air to the storage unit,
The drain suction device is characterized in that the air suction supply unit pumps the drain water stored in the storage unit through the pumping pipe by suctioning air from the pumping pipe and air pressure feeding to the storage unit. The air suction supply unit further has an air pressure feeding unit that sends out compressed air,
The air suction supply unit is a vacuum generating device that includes a narrow portion inside and that sucks air from the air separation portion by negative pressure when the compressed air from the air pressure feeding portion passes through the narrow portion. The drainage device according to claim 1, wherein the drainage device is a drainage device.

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