JP2597258B2 - Pumping pump equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump capable of switching the operation state according to the water level.

[0002]

2. Description of the Related Art Due to the recent tendency of urban areas to be dense, it has become difficult to provide drainage channels for flood control on the ground. Therefore, as part of deep underground utilization, the idea of constructing a large-scale pumping station with a drainage storage function underground has been launched.

For example, when a pumping station is provided deep underground, for example, 50 meters below the ground, a high-yield pumping facility is required to discharge water accumulated in the underground drainage reservoir to a discharge tank above the ground. The pump used for the pump equipment is required to perform a pumping operation that is an actual operation, and a management operation and a standby operation with a small amount of water at a low water level when the amount of stored water is small.

[0004]

As a countermeasure for this, there is a method in which the discharge water amount is adjusted by controlling the opening and closing of a valve provided in the pumping passage. However, this method is not applicable when the diameter of the pumping passage is large. Opening and closing control takes a long time.

[0005] The present invention has been made in view of the above problems, and has as its object to provide a pumping pump device capable of easily and reliably switching the operation state of a pump in a short time.

[0006]

In the pumping apparatus according to the present invention, a siphon passage is connected to a pumping passage communicating with a discharge port of the pump, and an air flow passage provided with an on-off valve at a top bend of the siphon passage. And a return passage having a return valve from the discharge tank is connected to the pump suction chamber.

[0007]

In the pumping pump apparatus having the above-mentioned structure, during the pumping operation, which is an actual operation state, the pump is operated by closing the on-off valve of the air flow passage or sucking air with a vacuum pump as required. In this case, since the siphon passage is full of water, the actual head is reduced and the discharge amount is increased. When pumping a small amount of water, such as during a management operation or a standby operation, the on-off valve of the air flow passage is opened to communicate the siphon passage with the atmosphere, or high-pressure air is blown as required.
In this case, since the siphon passage is not filled with water and no siphon is formed, the actual head is increased and the discharge amount is reduced. Further, the pumped water returns to the suction chamber through the return passage when the return valve is opened.

[0008]

FIG. 1 shows a pumping apparatus according to an embodiment of the present invention. Reference numeral 1 denotes a water absorption tank provided in a deep underground such as 50 m below the ground, and an intake port 2 is formed at the bottom.

Reference numeral 3 denotes a high-lift vertical shaft pump, and a drive motor M
, A suction port 32, a discharge port 33, and the like. The pumping passage 4 communicates with the discharge port 33 of the pump 3, and the siphon passage 5 communicates with the pumping passage 4. The discharge tank 6 facing the siphon passage 5
The suction port 32 of the pump 3 communicates with a return passage 7, and an on-off valve 8 is interposed in the return passage 7. Further, an air flow passage 9 is communicated with the top bent portion 51 of the siphon passage 5. An on-off valve 10 is interposed in the air flow passage 9,
Further, on-off valves 100 and 200, a vacuum pump 210, and a compressor 110 are connected to each other.
Reference numeral 11 denotes a weir provided in the discharge tank 6, and reference numeral 12 denotes a weir provided in the water absorption tank 1.

In the pumping pump device having the above-described configuration, the on-off valve 1 of the air flow passage 9 is provided during the pumping operation, which is an actual operation state.
0 is closed and the pump 3 is operated. In such a case, since the siphon passage 5 becomes full of water, the actual head is reduced and the discharge amount is increased. When a small amount of water is pumped, such as during a management operation or a standby operation, the on-off valve 10 of the air flow passage 9 is opened to allow the siphon passage 5 to communicate with the atmosphere. In such a case, since the air pocket S is formed in the siphon passage 5 and no siphon is formed as shown in the figure, the actual head Ha becomes large and the discharge amount decreases. The return valve 8 is closed during the pumping operation and opened during the management operation, and the water discharged to the discharge tank 6 during the management operation is returned to the suction chamber 32 side of the pump 3 via the return passage 7. Here, air may be sucked by the vacuum pump 210 to promote siphon formation, or air may be sent by the compressor 110 to prevent siphon formation. In FIG. 1, W1 indicates a water level during the pumping operation, and W2 indicates a water level during the management operation.

FIG. 2 shows a performance curve A of the pump and pressure loss curves B1 and B1 when water flows through the pumping passage 4 and the siphon passage 5.
It is a characteristic diagram which showed B2. As can be seen from this figure, since the pump performance is constant, the actual head when obtaining the discharge amount Q1 during the pumping operation with a large discharge amount is Ha, and the discharge amount Q2 during the management operation with a small discharge amount is obtained. The actual head is H
b.

[0012]

According to the present invention, even if the pumping passage and the siphon passage have a large diameter, the operating state of the pump can be switched only by controlling the opening and closing of the valve of the air pipe. It does not take much time, and the switching is easy and reliable.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a water pump device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram.

[Explanation of symbols]

 Reference Signs List 3 pump 4 pumping passage 5 siphon passage 7 return passage 8 return valve 9 air flow passage 10 on-off valve 33 discharge port 51 top bend of siphon passage

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenhisa Fukahori 1-1-1 Nakamiya Oike, Hirakata City, Osaka Prefecture Inside Kubota Hirakata Factory (56) References JP-A-63-70727 (JP, A)

Claims (1)

(57) [Claims] 1. A siphon passage is connected to a pumping passage communicating with a discharge port of a pump. An air flow passage having an on-off valve is communicated with a top bend of the siphon passage. A pumping pump device characterized in that a return passage having (1) is communicated with the pump suction chamber.