JPH0786360B2 - Liquid pumping equipment - Google Patents

Description

The present invention relates to a liquid capable of pumping a liquid containing a solid substance such as earth and sand to a high place together with a floating substance floating on the liquid surface of the liquid. The present invention relates to a pumping device.

[Conventional technology]

As a pumping method for pumping water containing soil and the like, there is a method using a bubble pump. This bubble pump was developed for the purpose of draining the mines of coal mines,
By injecting air into the pumping pipe from near the suction port at the lower end of the pumping pipe deeply inserted in water, an upward flow of a mixture of water and air is generated in the pumping pipe, and the upper end side of the pumping pipe is It is designed to pump water. In such a method using a bubble pump, since the pump is not provided in the pumping path, there is no obstacle in the pumping pipe through which the pumping flow passes, and it is possible to pump up water containing solid matter such as earth and sand. It has the advantage that However, the principle is that the water in the pumping pipe is made into a mixed state of water and air by injecting air into the pumping pipe from the lower end of the pumping pipe, and the average specific gravity of the mixture is only water. By making it smaller than the specific gravity,
It is to draw a water column higher than the surface of the water and generate it in the lifting pipe. Therefore, in the method using the bubble pump as described above, the pumping capacity is restricted by the depth below the liquid surface at the lower end of the pumping pipe, and if the sufficient depth cannot be secured, its use becomes difficult. . Therefore, its use is limited to deep wells, deep seabeds, lake bottoms, etc. Also, since the speed of the upward flow generated in the pumping pipe is small,
There is a problem that the amount of solids that can be pumped up with water is about ballast (gravel), and that floating substances floating on the liquid surface cannot be pumped up.

For this reason, the device disclosed in Japanese Patent Laid-Open No. 62-195498 has been proposed. That is, this device has an inlet portion whose lower end opening is immersed in the first liquid, an outlet portion whose lower end opening with a flap valve is immersed in the second liquid, and upper end openings of these two parts. And an air compressor and a delivery line for injecting air into the lower end opening of the inlet portion. Further, a gas receiving chamber is provided in the apex device, and a valve member for communicating the suction port opened in the gas receiving chamber with a suction pump and opening / closing the suction port is arranged in the apex device.

Using this device, the liquid is pumped up as follows. That is, in the initial state, since the inside of the conduit is at atmospheric pressure, the liquid surface in the inlet portion and the liquid surface in the outlet portion are at the same height as the outer liquid surface. Then, when the suction pump is started, the pressure in the conduit is reduced, and the liquid level in the inlet part and the liquid level in the outlet part are raised. After that, or at the same time when the suction pump is started,
The air compressor is started and pressurized air is forced from the air compressor through the delivery line into the lower opening of the inlet section. As a result, the effective density of the liquid in the inlet portion is reduced, and the liquid level in the inlet portion is further raised. At this time, the air press-fitted into the lower end opening of the inlet portion becomes bubbles and rises in the first liquid in the inlet portion, then enters the apex device and is sucked into the suction pump from the gas receiving chamber. Eventually, the liquid surface in the inlet portion reaches the apex device, and then flows through the apex device to the outlet portion and is connected to the liquid surface in the outlet portion, thereby continuing the inlet portion, the apex device and the outlet portion. The liquid passage will be established. After the passage of the liquid is established in this way, the valve member opens and closes the suction port opened in the gas receiving chamber so that the equilibrium liquid level in the apex device is maintained. Pull out. According to this device, the pumping capacity can be significantly improved as compared with the method using the bubble pump.

[Problems to be solved by the invention]

However, in the above device, in order to pressurize the compressed air into the lower end opening of the inlet portion of the conduit, the air compressor that generates the compressed air, and the compressed air into the lower end opening of the inlet portion. It is necessary to provide a delivery line for delivering up to, the apparatus becomes expensive, the structure is complicated, and the entire apparatus becomes large. Moreover, since the lower end of the inlet portion formed in a tubular shape is projected right below to the inside of the first liquid, when pumping the liquid from the lower end opening,
Floating matter floating on the liquid surface with this liquid can hardly be pumped up together. Further, since the tubular outlet portion is extended downward and the flap valve is attached to the lower end opening, the flap valve opens when the lower end portion of the outlet portion is not immersed in the second liquid. When air bubbles intrude into the outlet from the lower end opening and the bubbles and liquid rise upward in the outlet and flow into the gas receiving chamber of the apex device, the degree of vacuum in the gas receiving chamber decreases and the pumping amount is increased. Is reduced. Therefore, it is necessary to manage the installation position of the storage tank for storing the second liquid and the liquid level position in the storage tank, which complicates the management surface.

Therefore, an apparatus disclosed in Japanese Patent Laid-Open No. 55-64200 has been proposed. This device is located at the bottom of the water (eg the bottom of an underground tunnel).
It is a device for sucking up sediment and mud water that have settled to a high place, and is equipped with a vacuum pump, a recovery vacuum tank that communicates with this, and a suction pipe that extends downward from this vacuum tank. A flexible pipe having a suction fitting is attached to the tip portion, and the suction fitting is provided with an air introduction pipe with a throttle valve. Since this device does not have an air compressor, a delivery line, etc., it is inexpensive, the structure is simplified, and the entire device is downsized.

However, this device is a device for sucking up the earth and sand or muddy water that has settled on the bottom of the water, so that the suction fitting of the flexible pipe attached to the tip of the suction pipe is thrust downward into the muddy water or the like. Therefore, when sucking muddy water or the like through the tip opening of the suction metal fitting, it is not possible to suck up the suspended matter floating on the water surface together with the muddy water or the like. Moreover, since the muddy water sucked up by the suction pipe is stored in the vacuum tank, the storage amount in the vacuum tank is limited.

The present invention has been made in view of the above circumstances, is inexpensive, has a simple structure, can be downsized the entire device, and can efficiently pump up suspended matter floating on the liquid surface. Moreover, it is an object of the present invention to provide a liquid pumping-up device whose management is simplified.

[Means for solving problems]

In order to achieve the above object, the liquid pumping apparatus of the present invention has a pumping pipe arranged from a sealed vacuum chamber arranged above the liquid surface toward the liquid surface, and a ceiling of the vacuum chamber. A pumping device for a liquid, which is connected to a pressure reducing means for depressurizing the inside of the vacuum chamber by sucking air in the vacuum chamber, wherein the lower end opening of the pumping pipe is opened near the liquid level, and A plate-like body is attached to the lower end of the pumping pipe with a predetermined distance from the lower end opening, and the plate-like body is arranged at a position slightly immersed in the liquid from the liquid surface, and the vacuum chamber By decompressing with a decompression means, a liquid column due to the pressure difference from the atmospheric pressure is created inside the pumping pipe, and the atmosphere is allowed to naturally flow into the lower end of the liquid column from the lower end or the lower end opening of the pumping pipe. Pumping liquid into the vacuum chamber,
A discharge pipe for discharging the liquid pumped up into the vacuum chamber to the outside is extended downward from the bottom of the vacuum chamber, the lower end portion of the discharge pipe is formed in a U shape, and the discharge pipe is opened at the end portion of the U shape portion. The outlet is provided with a valve element that is opened when the pressure at the outlet is equal to or higher than the atmospheric pressure and that is capable of discharging the liquid in the outlet pipe to the outside.

[Action]

That is, in the liquid pumping-up device of the present invention, a pumping pipe is arranged from a sealed vacuum chamber discharged above the liquid surface toward the liquid surface, and a vacuum chamber inside the vacuum chamber is provided on the ceiling side of the vacuum chamber. A decompression means for decompressing the inside of the vacuum chamber by sucking air is connected. Then, by decompressing the inside of the vacuum chamber using a decompression means, a liquid column due to the atmospheric pressure and its differential pressure is created in the pumping pipe, and at the lower end of this liquid column, the atmosphere is at the lower end of the pumping pipe. Alternatively, the liquid is pumped into the vacuum chamber by allowing the liquid to flow naturally through the lower end opening. As described above, in the present invention, the atmosphere is allowed to naturally flow into the liquid column in the pumping pipe from the lower end portion or the lower end opening of the pumping pipe, so that a conventional example (apparatus shown in JP-A-62-195498) In addition, the air compressor and the delivery line, which were required in the above, are not required, the apparatus becomes inexpensive, the structure thereof is simplified, and the entire apparatus is downsized. Moreover, the lower end opening of the pumping pipe is opened in the vicinity of the liquid surface, and a plate-like body is attached to the lower end portion of the pumping pipe with a predetermined distance from the lower end opening to attach the plate-like body. Since it is arranged at a position slightly submerged in the liquid from the liquid surface, the liquid vigorously flows into the dish from the outer peripheral part of the dish, and the floating matter floating on the liquid surface with this inflow is also dish-shaped. Flows into the body. Therefore, the liquid and suspended matter that have flowed into the dish can be efficiently pumped from the lower end opening of the pumping pipe that opens near the liquid surface. Further, a discharge pipe for discharging the liquid pumped up into the vacuum chamber to the outside is extended downward from the bottom of the vacuum chamber, the lower end portion of the discharge pipe is formed in a U shape, and the end portion of the U shape portion is opened. A valve element is attached to the discharge port that can be opened when the pressure at the discharge port is higher than atmospheric pressure to discharge the liquid in the discharge pipe to the outside. The vacuum chamber is closed and the vacuum chamber is sealed.
When the drainage liquid accumulates in the drainage pipe and exceeds a certain amount, the valve body automatically opens and is discharged to the outside. When the valve body is open, the lower end portion of the discharge pipe is formed in a U shape, so that bubbles do not flow from the discharge opening that opens at the end portion of the U shape portion. Therefore, the conventional example (Japanese Patent Laid-Open No.
It is no longer necessary to perform the management in the device of the present invention, which was necessary in the device shown in the 55-64200 publication). Moreover, the liquid pumping apparatus of the present invention can be used as an oxygen supply apparatus. That is, by circulating the liquid in the same tank (at this time, fresh air flows into the circulating liquid) by the device of the present invention, extremely effective aeration is performed. It is possible to utilize the device of the present invention for environmental technology by utilizing the aeration of a river or a moat which is in an oxygen-deficient state.

Next, the present invention will be described in detail based on examples.

〔Example〕

FIG. 1 shows an embodiment of a liquid pumping apparatus used in the present invention. In the figure, 10 is a pumping pipe having a pipe diameter of 25 mm and extending downward from above the water surface (at a position 2800 mm above the liquid surface). The upper end of the scooping pipe 10 is bent, and its upper discharge port is opened in the sealed box-shaped vacuum chamber 11 so as to face the horizontal direction. This prevents water discharged from the upper-end discharge port from being sucked into the vacuum pump 13 described later due to the discharge flow velocity. A sealed box-shaped air chamber (atmosphere introduction chamber) is provided at the lower end of the pumping pipe 10.
18 is provided, and an air introducing pipe 18a for allowing atmospheric air to naturally flow into the air chamber 18 is connected. Reference numeral 25 is a valve that adjusts the amount of air flowing into the air chamber 18, and is attached to the tip of the air introducing pipe 18a. The above-mentioned pumping pipe 10
A saucer (dish-shaped body) 24 is attached to the lower end of the tray at a predetermined interval.

12 is a pipe extending from the upper end of the vacuum chamber 11 to the outside, and 13 is a vacuum pump connected to the end of the pipe 12 (suction work rate, 110 W, vacuum degree, 709 water column mm, air volume, 0.95 m ³ per Use a household vacuum cleaner with the capacity of minutes). Further, 14 is a breathable mist separator provided in the pipe 12,
When the inside of the vacuum chamber 11 is decompressed by the mist separator 14 and the vacuum pump 13, moisture or the like is removed from the air flowing through the pipe 12 to prevent the moisture from entering the vacuum pump 13.

Reference numeral 15 is a discharge pipe vertically provided from the bottom of the vacuum chamber 11, which forms a U-shaped trap 15a on the lower side, and a check valve 16 is provided at the discharge port at the tip. The vertical height between the check valve 16 and the bottom of the vacuum chamber 11 is set to be equal to or higher than the height of the liquid column equal to the degree of vacuum created in the vacuum chamber 11. Therefore, the check valve 16 is closed because the external atmospheric pressure is large until the liquid column in the liquid flowing down in the discharge pipe 15 becomes equal to the vacuum degree in the vacuum chamber 11, and the atmosphere does not flow in. . When the liquid flowing down is accumulated in the discharge amount 15 and the liquid column in the discharge pipe 15 becomes equal to the vacuum degree in the vacuum chamber 11, the pressure inside and outside the discharge port is balanced, and when the liquid column becomes higher than that, the check valve 16 opens and the liquid is discharged from the discharge port. At that time, the flow of the atmospheric air flowing into the discharge pipe 15 is the U-shaped trap 15a.
Will be shut off.

In this structure, first, the vacuum pump 13 is operated.
As a result, the inside of the vacuum chamber 11 is decompressed, the air pressure inside the vacuum chamber 11 drops, and a water column is formed in the pumping pipe 10 and the air chamber 18
The air naturally flows into the pumping pipe 10, and a violent upflow of gas-liquid mixture occurs in the pumping pipe 10, and the water near the liquid surface sucks from between the tray 24 and the air box 18 together with the suspended matter that it receives. Fried. Then, the water or the like pumped into the vacuum chamber 11 flows down through the discharge pipe 15, the check valve 16 provided at the discharge port automatically opens and closes, and the water, etc. flowing down from the vacuum chamber 11 Is discharged to the outside. That is, the liquid level in the discharge pipe 15 is changed to the check valve 16
When the liquid level is higher than the constant height, the force to close the check valve 16 becomes 0 when the height is higher than the constant height. Is started to be discharged, and the check valve 16 is closed when the discharge becomes low. For this reason, the discharge pipe
Water and the like flowing down 15 are intermittently discharged while the liquid level is always maintained at a constant height. In the above embodiment, this constant height was approximately 800 mm. The air sucked from the vacuum chamber 11 by the vacuum pump 13 is sucked into the vacuum pump 13 after impurities such as dust and water vapor are removed by the mist separator 14.

In this way, this liquid pumping device is equipped with a pumping pipe 10
In addition to increasing the liquid level in the scooping pipe 10 by mixing the air naturally introduced from the air chamber 18 provided in the scooping pipe 10 with water in the scooping pipe 10 to reduce its average specific gravity. , In the vacuum chamber 11 depressurized by the vacuum pump 13,
Since the water or the like is sucked up by utilizing the pressure difference between the upper side and the lower side of the pumping pipe 10, the upper limit of the pumped water can be increased. In addition, the pumping capacity such as increasing the size of the solid material to be pumped up can be greatly improved.
Moreover, since the air compressor and the delivery line, which are required in the conventional example, can be omitted, the cost is low, and the structure is simple and compact. Furthermore, since the pipe 12 is provided with the mist separator 14, it is possible to avoid a situation in which impurities other than air enter the vacuum pump 13 and the vacuum pump 13 is damaged by the intrusion of the impurities.

FIG. 2 shows a liquid pumping apparatus used in another embodiment. This device does not use a vacuum pump as a decompression means for the vacuum chamber 11a, but uses a jet ejector 26. That is, in the figure, 27 is a jet water recovery tank integrally formed with the vacuum chamber 11a with a wall surface 28 as a boundary, and a jet water recovery pipe 29 extending from the upper side of the vacuum chamber 11a projects into the upper space thereof. ing. The jet water recovery pipe 29 has a large diameter on the vacuum chamber 11a side. Reference numeral 30 is an air vent provided on the ceiling of the jet water recovery tank 27, and 31 is an overflow pipe for maintaining the jet water in the jet water recovery tank 23 at a constant level. Reference numeral 32 is a jet water circulation pipe extending from the bottom of the jet water recovery tank 27, and the other end thereof is connected to the jet water ejector 26 for jetting water. From this jet ejector 26, a jet water discharge pipe 33 is extended,
Its tip 33a extends into the vacuum chamber 11a. This tip
33a is positioned at the position of the opening of the jet water recovery pipe 29, which is kept at a predetermined interval and in a relative position, and therefore, when the jet ejector 26 is operated, the jet water recovery tank 27, the jet water circulation pipe 32, Jet Ejector 26, Jet Water Discharge Pipe 33, Jet Water Recovery Pipe
Jet water vigorously circulates in the circulation path formed at 29,
In the vacuum chamber 11a where the jet water flow is exposed,
The air in the vacuum chamber 11a is caught in the jet water and sucked into the jet water recovery tank 27 side. As a result, the inside of the vacuum chamber 11a is decompressed, the liquid or the like is sucked from the lower side of the scooping pipe 10, and the liquid or the like is discharged from the discharge pipe 15a. At this time, the air carried into the jet water recovery tank 27 is discharged from the air vent 30 to the outside of the jet water recovery tank 27, and when the liquid amount in the jet water recovery tank 27 exceeds a certain amount, the overflow pipe 31
Is discharged from the outside. Other parts are the same as those in the embodiment of FIG. With this configuration, the degree of vacuum in the vacuum chamber 11a can be further increased and the pumping capacity can be further improved. In addition, the jet water flow is not in the upward direction but in the horizontal direction, and therefore the power is small.

〔The invention's effect〕

As described above, according to the liquid pumping apparatus of the present invention, the air compressor and the delivery line, which are required in the conventional example (the apparatus shown in Japanese Patent Laid-Open No. 62-195498), are not necessary, and the apparatus Becomes cheaper, the structure is simplified, and the entire device becomes smaller. Moreover, the lower end opening of the pumping pipe is opened in the vicinity of the liquid surface, and a plate-like body is attached to the lower end portion of the pumping pipe with a predetermined distance from the lower end opening to attach the plate-like body. Since it is arranged at a position slightly submerged in the liquid from the liquid surface, the liquid vigorously flows from the outer peripheral portion of the dish-shaped body into the dish-shaped body, and with this inflow, suspended matter floating on the liquid surface is also dished. Inflow into the state. Therefore, the liquid and suspended matter that flowed into the dish,
It is possible to efficiently pump up from the lower end opening of the pumping pipe that opens near the liquid surface. Further, a discharge pipe for discharging the liquid pumped up into the vacuum chamber to the outside is extended downward from the bottom of the vacuum chamber, the lower end portion of the discharge pipe is formed in a U shape, and the end portion of the U shape portion is opened. At the outlet,
Since a valve element is installed that opens when the pressure at the discharge port is higher than atmospheric pressure and can discharge the liquid in the discharge pipe to the outside, when the pressure in the vacuum chamber is reduced, the valve body closes the discharge port and the vacuum chamber is closed. Becomes a sealed state, and when the drainage liquid is accumulated in the drainage pipe and exceeds a certain amount, the valve body is automatically opened and drained to the outside. Further, since the lower end portion of the discharge pipe is formed in a U shape when the valve body is opened, air bubbles do not flow from the discharge port opened at the end portion of the U shape portion. Therefore, the management of the conventional example (the apparatus disclosed in Japanese Patent Laid-Open No. 55-64200) is no longer necessary in the apparatus of the present invention. Moreover, the liquid pumping apparatus of the present invention can be used as an oxygen supply apparatus. That is, by circulating the liquid in the same tank (at this time, fresh air flows into the circulating liquid) by the device of the present invention, extremely effective air race is performed. It is possible to utilize the device of the present invention for environmental technology by utilizing the aeration of a river or a moat which is in an oxygen-deficient state.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a main portion of another embodiment. 10 …… pumping pipe, 11 …… vacuum chamber, 13 …… vacuum pump,
15 ... Discharge pipe

Claims (1)

[Claims] 1. A pumping pipe is provided from a hermetically sealed vacuum chamber disposed above the liquid surface toward the liquid surface, and air in the vacuum chamber is sucked to the ceiling side of the vacuum chamber. A pumping device for a liquid connected to a decompression means for decompressing the inside of the vacuum chamber, wherein the lower end opening of the pumping pipe is opened near the liquid surface, and a predetermined interval is provided between the lower end opening and the lower end opening. A dish-shaped body is attached to the lower end of the pumping pipe, and the dish-shaped body is arranged at a position slightly immersed in the liquid from the liquid surface. A liquid column due to the differential pressure is created in the pumping pipe, and at the lower end of the liquid column, the atmosphere is allowed to naturally flow into the vacuum chamber from the lower end or the lower end opening of the pumping pipe, and the liquid is pumped into the vacuum chamber. The discharge pipe for discharging the pumped liquid to the outside is installed in the vacuum chamber. The lower end of the discharge pipe is formed in a U shape, and is opened at the discharge port opening at the end of the U-shaped portion while the pressure at the discharge port is equal to or higher than atmospheric pressure. A liquid pumping apparatus, which is equipped with a valve body capable of discharging liquid in a discharge pipe to the outside.