JPH08296600A - Suction adjusting device for suction device - Google Patents

Abstract

PURPOSE: To dissolve the clogging of sludge in a hose at high head by providing a tank with a first suction port for sucking muddy water and the like and a second suction port for sucking air, and switching a solenoid valve on to open the second suction port when a liquid level reaches a specified position. CONSTITUTION: A tank 10 is provided with a first suction port 70 for sucking muddy water and the like by the suction pressure of a vacuum pump, a second suction port 60 for sucking air, and a discharge port 80 for discharging sucked material. A liquid level detecting means 40 is provided to detect the liquid level of muddy water and the like sucked into the tank 10, and a solenoid valve 50 is provided at the second suction port 60 so as to open/close the second suction port 60. A control means 30 is further provided to switch the solenoid valve 50 on to open the second suction port 60 when the detection value from the liquid level detecting means 40 reaches the specified value. Accordingly, even if the whole suction port part of a hose is placed in liquid, air is automatically adjusted to suck together with the muddy water so as to improve workability at the time of sucking muddy water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction adjusting device used for a device for sucking spring water, mud water, etc. generated at the time of excavation for underground construction or tunnel construction at a high head.

[0002]

2. Description of the Related Art Conventionally, as a suction device used for underground construction or the like, a suction device 300 having a structure shown in FIG. 4 is known (Japanese Patent Laid-Open No. 5-280069). This device 30
0 connects a plurality of closed tanks 6 to a hose 3 arranged in a digging pit 5 that has been digged vertically or obliquely at each interval at which the suction force of the suction pump 1 reaches. In each closed tank 6, the lower end of the hose 3a from above hangs downward, the upper end of the hose 3b from below rises upward, and the upper end of the hose 3b is arranged at a position higher than the lower end of the hose 3a. There is. With such a configuration, the suction device 30
0 is to connect a hose 3 to a vacuum tank 2 that is decompressed by a suction pump 1 installed on the ground, and put a sludge 4 in an excavation pit 5 on an air flow to suck it.

[0003]

However, in the suction device 300 disclosed above, a part of the suction port 3c of the hose 3 is placed on the liquid surface of the sludge 4 in order to suck the sludge 4 on the air flow. It is necessary to dispose the sludge 4 above and suck the sludge 4 together with the air, and a part of the suction port 3c must always be arranged on the liquid surface of the sludge 4 as the liquid level changes. There is a problem that is not good. Further, the device 300 has a multi-stage structure in which a plurality of closed tanks 6 are provided, but since air is not always sucked in after the second stage of the closed tank 6, only the sludge 4 is connected to the hose 3.
Sucked inside. As a result, the head of the device 300 is lowered and the sludge 4 is clogged in the hose 3. Therefore, in order to suck the sludge 4 to a high place, the suction pump 1 must be temporarily stopped and the sludge 4 must be pulled out. However, there is a problem that workability is significantly reduced. At this time, since the inside of the device 300 is opened to the atmospheric pressure, the sludge 4 sucked halfway through the hose 3 flows backward.

Therefore, an object of the present invention is to provide a function of automatically adjusting the inflow of air, to always suck air together with sludge,
It is an object of the present invention to provide a suction device that pushes sludge up by the action of the sucked air and has a high lift so that the hose is not clogged with sludge.

[0005]

In order to solve the above-mentioned problems, the structure of the present invention provides a vacuum pump provided at a high place with a vacuum pump for removing water and muddy water generated at a low place such as an underground excavation pit. In the suction adjusting device installed near the suction end of the hose of the suction device that sucks up to a high place with a connected hose or at a relay point, the first suction that sucks muddy water etc. by the suction pressure of the vacuum pump. A mouth, a second suction port through which air is sucked in, and a discharge port provided lower than the first suction port and discharging the substance sucked from the first suction port and the second suction port. A tank provided, a liquid level detecting means for detecting the liquid level of muddy water sucked in the tank, a solenoid valve provided at the second suction port and opening and closing the second suction port, and a liquid level When the detected value from the detection means reaches a predetermined value, the electromagnetic And control means for turning off the solenoid valve and closing the second suction port when the detection value from the liquid level detection means has not reached the predetermined value. It is characterized by having.

The structure of the second invention is characterized in that the second suction port is provided with a manual valve in parallel with the electromagnetic valve.

[0007]

ACTION AND EFFECT The first action of the present invention having the above-described structure is that the second suction port for sucking air is provided in the tank in addition to the first suction port for sucking muddy water, and the liquid level detecting means is used. The liquid level in the tank is detected, and when the liquid level reaches a predetermined position, the solenoid valve provided in the second suction port is turned on by the control means to open the second suction port. The effect is that even if the entire hose suction port is placed in the liquid, the air can be automatically adjusted and sucked together with the muddy water. It is not necessary to place the part on the surface of the muddy water, and the workability at the time of sucking the muddy water is improved. In addition, since air is always sucked together with muddy water, the head of the suction device does not decrease, the hose does not get clogged, and there is no need to temporarily stop the vacuum pump to drain the muddy water that has clogged the hose. Suction of muddy water can be performed continuously, and workability during muddy water suction is further improved. Further, even if multiple tanks are connected with a hose to form a multi-stage structure, when the muddy water sucked in each tank reaches a predetermined liquid level, the solenoid valve operates and air is sucked in, so that the discharge port Since the gas-liquid two-phase fluid of muddy water and air is discharged, muddy water can be satisfactorily suctioned,
It can be a high-lift suction device. In the unlikely event that the air flow rate is low and the liquid level of the muddy water in the tank is higher than the upper end position of the discharge port, muddy water that does not contain air is discharged from the discharge port, the head of the suction device is lowered, and the muddy water is stored in the hose. Even if it gets clogged up, it is not necessary to stop the vacuum pump, and by turning on the solenoid valve, the inside of the tank is opened to atmospheric pressure,
A part of the muddy water in the tank flows back from the muddy water suction port, while the other muddy water is sucked by the suction device. (Claim 1)

The second action is to provide a manual valve in parallel with the solenoid valve at the second suction port. The effect is that the solenoid valve provided at the second suction port is turned on and off. To
It is difficult to adjust the amount of air sucked from the second suction port, but by adjusting the opening of the manual valve, the amount of air can be adjusted, and the amount of the substance sucked from the first suction port can be adjusted. It is possible to set the amount of air to be sucked to an appropriate amount according to the situation of viscosity, specific gravity, flow rate, etc., and to effectively suck mud water. (Claim 2)

[0009]

EXAMPLES The present invention will be described below based on specific examples. FIG. 1 is a structural diagram showing the configuration of a first embodiment according to the present invention. The air booster tank (corresponding to the suction adjusting device) 100 used in the suction device is mainly composed of
A tank (corresponding to a tank) 10 for sucking and storing muddy water therein, an optical liquid level sensor (corresponding to a liquid level detecting means) 40 for detecting a liquid level in the tank 10, and a first air intake port A solenoid valve (corresponding to a solenoid valve) 50 that opens and closes 60, and a CPU (corresponding to a control unit) 30 that controls ON / OFF of the solenoid valve 50 based on the detection value of the liquid level sensor 40.

The tank 10 has a rectangular parallelepiped shape, and has a liquid level sensor 40, a solenoid valve 50, and a C on its upper surface 10a.
The PU 30 and the like and the cover 20 for protecting them are provided. A first air suction port (corresponding to a second suction port) 60 is provided on the upper surface 10a of the tank 10, and one side surface 1 is provided.
A mud suction port (corresponding to the first suction port) 70 is provided at 0b, and a discharge port (corresponding to the discharge port) 80 is provided at the other side surface 10c. The inner diameters of the muddy water suction port 70 and the discharge port 80 are both 4 inches, and the center position of the muddy water suction port 70 is located higher than the center position of the discharge port 80.

The first air intake port 60 provided on the upper surface 10a of the tank 10 comprises an inlet portion 60a and an outlet portion 60b, and the inlet portion 60a is formed parallel to the upper surface 10a. A second air intake port 61 is provided in the middle of the first air intake port 60 in parallel with the upper surface 10a of the tank 10 so as to communicate with the outlet part 60b. A manual valve (corresponding to a manual valve) 62 is provided at the second air intake 61, and the valve opening can be manually adjusted. In this embodiment, the inner diameter of the inlet portion 60a of the first air suction port 60 is 25 mm, the inner diameter of the outlet portion 60b is 32 mm, and the inner diameter of the second air suction port 61 is 25 mm.

Next, the operation of the air booster tank 100 will be described. 2A to 2D are schematic diagrams showing the operating state of the air booster tank 100.
The discharge port 80 is connected to a vacuum pump (not shown) through a hose (not shown), and the pressure inside the tank 10 is reduced by driving the vacuum pump, and the muddy water 90 from the muddy water suction port 70 enters the tank 10 at a rate of 300 liters per minute. Sucked. At this time, the liquid level of the muddy water 90 is detected by the liquid level sensor 40, and when the liquid level of the muddy water 90 is lower than the predetermined reference liquid level TH, the solenoid valve 50 is turned off (FIG. 2 (a)).
reference). In this embodiment, the reference liquid level TH is the discharge port 8
Set it to a position lower than the inner diameter lower end of 0
Was set to closed.

When the liquid level of the muddy water 90 reaches the reference liquid level TH, the CPU 30 turns on the solenoid valve 50, opens the first air intake port 60, and sucks air into the tank 10 (FIG. 2 (b). )reference). In this embodiment, the solenoid valve 50 is kept in the ON state for at least a predetermined time (for example, 30 seconds). When the liquid level of the muddy water 90 reaches the lower end of the inner diameter of the discharge port 80, the muddy water 90 is sucked together with air to the vacuum pump side (see FIG. 2 (c)).

By operating the air booster tank 100 in this manner, even if the entire portion of the suction port of the hose (not shown) connected to the muddy water suction port 70 is arranged in the liquid, the muddy water 90 is always sucked together with the air. Therefore, it is not necessary to dispose a part of the suction port of the hose on the liquid surface with the change of the liquid level, and the workability at the time of sucking the muddy water 90 is improved.
Further, since the air is always sucked together with the muddy water 90, the head of the suction device does not decrease, the muddy water 90 is not clogged in the hose, the muddy water 90 can be continuously sucked, and the vacuum pump is temporarily stopped. Therefore, it is not necessary to extract the muddy water 90 clogged in the hose, and the workability in sucking the muddy water 90 is greatly improved. Furthermore, a plurality of air booster tanks 100 are connected by a hose, and the air booster tank 1
Even if 00 is a multi-stage structure, each air booster tank 10
At 0, when the liquid level of the muddy water 90 reaches a predetermined level, the solenoid valve 50 operates and air is sucked together with the muddy water 90, so that the gas-liquid two-phase fluid of the muddy water 90 and the air flows between the hoses, and 90 can be satisfactorily sucked, and a high-lift suction device can be obtained. In the unlikely event that the air flow rate is low, the liquid level of the muddy water 90 in the tank 10 becomes higher than the upper end position of the discharge port 80, the muddy water 90 containing no air is discharged from the discharge port 80, and the head of the suction device decreases. , Muddy water 9
Even if 0 gets stuck in the hose, it is not necessary to stop the vacuum pump. That is, by turning on the solenoid valve 50, the inside of the tank 10 is opened to the atmospheric pressure, and a part of the muddy water 90 in the tank 10 flows back from the muddy water suction port 70, but the other muddy water 90 is sucked by the suction device. It

When the amount of air sucked from the first air suction port 60 is smaller than the capacity of the muddy water 90 sucked into the tank 10, the ratio of the amount of air sucked to the vacuum pump side is gradually increased. The number of pumps decreases, and the lift of the suction device decreases. Under such a circumstance, the opening degree of the manual valve 62 of the second air intake port 61 provided in parallel with the first air intake port 60 is adjusted to increase the amount of air sucked into the tank 10. It is possible to prevent the head of the suction device from decreasing (see FIG. 2D). Further, even if the characteristics (viscosity, specific gravity, etc.) of the muddy water 90 change or the flow rate of the muddy water 90 changes, the opening degree of the manual valve 62 is adjusted and the amount of sucked air is adjusted, so that the muddy water characteristics, etc. The muddy water 90 can be satisfactorily sucked even if the change occurs.

In this embodiment, the muddy water 90 is the suction target of the air booster tank 100. However, the present invention is not limited to this, and spring water having a low viscosity or sludge having a high viscosity may be applied. Good. Although the optical liquid level sensor 40 is used in this embodiment, the liquid level sensor 40 may be of any other type such as a mechanical type as long as it can detect the liquid level of the muddy water 90.

As an application example of the air booster tank 100 having the above-described structure and operation, FIG.
00 configuration is shown. A hose 180 for sucking muddy water is connected to the muddy water suction port 70 of the air booster tank 100, and a check valve 110 for preventing backflow is provided in the middle of the hose 180. Further, a hose 181 is provided at the discharge port 80 of the air booster tank 100 so that the hatch tank 1
The vacuum pump 160 is connected via the discharge unit 140 and the discharge unit 140. Below the hatch tank 130, a zuritro 170 for collecting solid matter is arranged. The liquid recovered by the discharge unit 140 passes through the hose 184 and is recovered in the recovery tank 150. A check valve 120 for preventing backflow is provided in the middle of the hose 184.

Next, the operation of the muddy water recovery system 200 will be described. First, when the vacuum pump 160 is driven, the air booster tank 100 via the hose 181.
Since the inside of the tank 10 is depressurized, muddy water is sucked into the tank 10 from the muddy water suction port 70 via the hose 180. When the liquid level of the muddy water sucked into the tank 10 reaches the reference liquid level, the solenoid valve is turned on, air is sucked from the first air suction port, and the muddy water is discharged from the discharge port 80 to the hose 181 together with the air. . The solid matter is removed from the discharged muddy water in the hatch tank 130, and the discharge unit 1
At 40, the liquid is removed. The liquid removed by the discharge unit 140 passes through the hose 184 and the recovery tank 150.
Will be collected.

As described above, by configuring the mud water recovery system 200 using the air booster tank 100 according to the present invention, it is possible to recover the solid matter and the liquid separately. In this embodiment, the muddy water recovery system 200
However, the present invention is not limited to this, and the air booster tank 10 is provided under the condition that the head of muddy water exceeds about 6 m.
A multi-stage configuration in which 0s are arranged at intervals of about 6m may be used.

As indicated above, according to the present invention,
In addition to the first suction port for sucking in muddy water, a second suction port for sucking air is provided in the tank, and the liquid level in the tank is detected by the liquid level detection means, and the liquid level has reached a predetermined position. Sometimes
The solenoid valve provided in the second suction port is turned on by the control means.
Then, by opening the second suction port, even if the entire part of the suction port of the hose is placed in the liquid, the air can be automatically adjusted and sucked together with the mud, so the liquid level of the mud changes. At the same time, it is not necessary to always dispose a part of the suction port of the hose on the surface of the muddy water, which improves workability when sucking the muddy water. Moreover, since the air is always sucked together with the muddy water, the head of the device does not decrease, the hose does not get clogged, and it is not necessary to temporarily stop the vacuum pump to drain the muddy water that has clogged the hose. Can be continuously sucked,
Workability during muddy water suction is further improved. Further, even if multiple tanks are connected with a hose to form a multi-stage structure, when the muddy water sucked in each tank reaches a predetermined liquid level, the solenoid valve operates and air is sucked in, so that the discharge port Since a gas-liquid two-phase fluid of muddy water and air is discharged, muddy water can be satisfactorily sucked, and a suction device with a high head can be obtained. In the unlikely event that the air flow rate is low and the liquid level of the muddy water in the tank is higher than the upper end position of the discharge port, muddy water that does not contain air is discharged from the discharge port, the head of the device is lowered, and the muddy water enters the hose. Even if it becomes clogged, it is not necessary to stop the vacuum pump, and by turning on the solenoid valve, the inside of the tank is opened to atmospheric pressure, and some of the muddy water in the tank flows back from the muddy water inlet, but other muddy water Is sucked into the suction device. In addition, since the solenoid valve provided at the second suction port is turned on and off, it is difficult to adjust the amount of air sucked from the second suction port. By installing a manual valve in parallel with the valve, the amount of air can be adjusted by adjusting the opening of the manual valve, and the conditions such as the viscosity, specific gravity and flow rate of the substance sucked from the first suction port can be adjusted. Accordingly, the amount of air to be sucked can be set to an appropriate amount and effective suction of muddy water or the like can be performed.

[Brief description of drawings]

FIG. 1 is a structural diagram showing a configuration of a first embodiment according to the present invention.

FIG. 2 is an explanatory diagram showing an operation status of the first embodiment according to the present invention.

FIG. 3 is a configuration diagram showing an application example of the first embodiment according to the present invention.

FIG. 4 is a configuration diagram showing a configuration of a conventional suction device.

[Explanation of symbols]

 10 Tank 20 Cover 30 CPU 40 Liquid Level Sensor 50 Solenoid Valve 60 First Air Inlet 70 Mud Intake 80 Discharge 90 Mud 100 Air Booster Tank

Claims (2)

[Claims] 1. A suction device for sucking water, muddy water, etc. generated in a low place such as an underground excavation pit to a high place by using a vacuum pump provided in the high place and a hose connected to the vacuum pump. In the suction adjusting device provided near the suction end of the hose or at the relay point, the suction pressure of the vacuum pump causes a first suction port for sucking mud and the like, and a second suction port for sucking air,
A tank provided lower than the first suction port and provided with a discharge port for discharging a substance sucked from the first suction port and the second suction port, and muddy water sucked into the tank Liquid level detecting means for detecting the liquid level such as, a solenoid valve provided in the second suction port and opening and closing the second suction port, and a detection value from the liquid level detecting means to a predetermined value. When it reaches, the solenoid valve is turned on, the second suction port is opened,
Suction adjustment comprising: a control unit that turns off the electromagnetic valve and closes the second suction port when the detection value from the liquid level detection unit has not reached the predetermined value. apparatus. 2. The suction adjusting device according to claim 1, wherein a manual valve is provided in parallel with the electromagnetic valve at the second suction port.