JP3938465B2 - Pump device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump device that pumps or drains fresh water or other liquids, and relates to a pump device having a siphon-shaped discharge pipe that is discharged from a discharge pipe through a position higher than the water surface and opens below the water surface. is there.
[0002]
[Prior art]
Conventionally, a pump device having a siphon-shaped discharge pipe of this type is provided with an electromagnetic valve, an electric valve, or a manual valve for supplying air to the siphon portion of the discharge pipe. After the pump is stopped, the valve is opened to supply air to the siphon portion of the discharge pipe, and the vacuum is broken to eliminate the siphon.
[0003]
If the solenoid valve, the motor operated valve, or the manual valve is provided, not only the apparatus becomes complicated, but also maintenance of these valves becomes necessary. Moreover, in a manual valve, after a pump stops, the troublesome operation | work of opening this manual valve manually is required, and there is a possibility of forgetting to open the valve.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and an object of the present invention is to provide a pump device that can eliminate siphons when air enters the siphon portion of the discharge pipe without any control when the pump is stopped.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 comprises a pump and a discharge pipe connected to the discharge port of the pump, and the discharge pipe discharges the water surface via a position higher than the discharge water surface. In the pump apparatus having a siphon-shaped discharge pipe that opens downward, the other end of the air supply pipe having one end connected to the top of the siphon-shaped discharge pipe and the other end of the air suction pipe having one end open to the atmosphere Merge at the specified height to form a single merge pipe, connect the merge pipe to the pump discharge pipe, and operate the pump while the siphon is formed without sucking air into the pump discharge pipe due to the moving water level of the discharged water during pump operation And after the pump is stopped, the air suction pipe automatically sucks air into the discharge pipe to destroy the siphon.
[0006]
As described above, a confluence pipe in which the other end of the air supply pipe and the other end of the air suction pipe are merged at a specified height near the top of the discharge pipe is connected to the pump discharge pipe, and after the pump stops, the air suction pipe Therefore, when the pump is stopped, air enters the siphon portion of the discharge pipe and can be eliminated without any control when the pump is stopped.
[0007]
The invention according to claim 2 is characterized in that, in the pump device according to claim 1, the specified height for joining the air supply pipe and the air suction pipe is lower than the dynamic water level of the discharge pipe connecting the join pipe. And
[0008]
As described above, the specified height for joining the air supply pipe and the air suction pipe is lower than the dynamic water level of the discharge pipe connecting the junction pipe, so that when the pump is operated, water enters a position higher than the junction section. Therefore, the air suction pipe and the air supply pipe are separated by the water contained in the pipe, and air is not supplied to the siphon portion of the discharge pipe, and the pump operation continues with the discharge pipe forming the siphon.
[0009]
The invention according to claim 3 is the pump device according to claim 1 or 2, wherein the height of the connecting portion of the discharge pipe connecting the merging pipe is merged with the other end of the air supply pipe and the other end of the air suction pipe. It is characterized by being the same as the height of the joining portion to be made or lower than the height of the joining portion.
[0010]
As described above, the height of the connection part of the discharge pipe that connects the merging pipe is the same as or lower than the height of the merging part that joins the other end of the air supply pipe and the other end of the air suction pipe. Therefore, when the pump stops and the inside of the discharge pipe becomes negative pressure, the water in the pipe that has divided the air supply pipe and the air suction pipe surely flows into the discharge pipe, and the siphon of the discharge pipe passes through the air supply pipe. Air is supplied to the part and siphon is eliminated.
[0011]
According to a fourth aspect of the present invention, in the pump device according to any one of the first to third aspects of the present invention, the height of the open end of the air suction pipe is set to the water level of the connecting portion that connects the junction pipe to the discharge pipe. It is characterized by higher than.
[0012]
As described above, the height of the air open end of the air suction pipe is made higher than the dynamic water level of the connection part connecting the merging pipe to the discharge pipe, so that the operation of the pump is continued and the movement of the connection part of the discharge pipe is continued. When the water level reaches a specified pressure (positive pressure), the outflow of water from the air suction pipe is eliminated.
[0013]
According to a fifth aspect of the present invention, in the pump device according to any one of the first to fourth aspects, a backflow prevention valve is provided in the air suction pipe.
[0014]
As described above, by providing the backflow prevention valve in the air suction pipe, it is possible to prevent the discharge water of the pump from flowing out from the air suction pipe when air remains in the siphon portion at the start of pump operation.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a pump device according to the present invention. In FIG. 1, reference numeral 2 denotes a pump in which a suction port 2 a opens below the suction water surface 1 of the suction water tank 11. A discharge pipe 3 is connected to the discharge port of the pump 2.
[0016]
The discharge pipe 3 forms a siphon portion 9 whose tip is discharged and opened below the water surface 10 via a position higher than the discharge water surface 10 of the discharge water tank 12. One end of an air supply pipe 7 is connected to the connection port 8 at the top of the siphon unit 9, and the other end of the air supply pipe 7 is joined to the other end of the air suction pipe 6 that is open to the atmosphere. The part 4 is connected to the connection port 5 of the discharge pipe 3. The junction 4 and the connection port 5 of the discharge pipe 3 are located at the same height. Moreover, the height of the air open end of the air suction pipe 6 is higher than the dynamic water level of the connection port 5 that connects the junction 4 to the discharge pipe.
[0017]
In the pump device configured as described above, when the pump 2 is stopped, the discharge pipe 3 contains only air and no water. When the pump 2 is operated, the discharge pipe 3 is filled with water and flows, but the air in the siphon part 9 of the discharge pipe 3 is accumulated in the upper part of the siphon part 9. If the operation of the pump 2 is continued in this state, the air in the siphon unit 9 is sequentially pushed out by the water flow in the discharge pipe 3, and the siphon unit 9 is filled with water and flows. The flow rate is regulated, the dynamic water level of the connection port 5 of the discharge pipe 3 is also regulated (positive pressure), and the outflow of water from the air suction pipe 6 is eliminated.
[0018]
If the joining part 4 at the other end of the air suction pipe 6 and the other end of the air supply pipe 7 is lower than the dynamic water level of the connection port 5, water enters to a position higher than the joining part 4, so the air suction pipe 6 and the air Since the supply pipe 7 is divided by the water that has entered the pipe, and no air is supplied to the siphon unit 9, the discharge pipe 3 continues to operate the pump 2 while forming a siphon. In FIG. 1, h <b> 1 indicates the water level difference between the air supply pipe 7 and the air suction pipe 6 during the pump operation, and h <b> 2 indicates the water level of the air suction pipe 6 from the center of the connection port 5. The water level difference h1 between the air supply pipe 7 and the air suction pipe 6 is equal to the water level difference h3 between the discharge water surface 10 and the connection port 8 of the air supply pipe 7 at the top of the siphon part 9 (h1 = h2).
[0019]
When the pump 2 is stopped, the inside of the discharge pipe 3 becomes negative pressure, air flows from the air suction pipe 6 into the discharge pipe 3, and water in the discharge pipe 3 flows out to the suction water tank 11. At the same time, water that has divided the air suction pipe 6 and the air supply pipe 7 flows out into the discharge pipe 3, so that air from the air suction pipe 6 is connected to the air supply pipe 7 via the air supply pipe 7. The air is supplied to the siphon unit 9 from 8 and the vacuum is broken, and the water in the siphon unit 9 is divided into the suction side and the discharge side and flows down.
[0020]
FIG. 2 is a diagram in which the dynamic water level in the steady state in which the siphon unit 9 is filled with water and flows is shown in the pipe longitudinal cross-sectional view of the pump device shown in FIG. In the figure, the vertical axis shows the discharge pipe profile and the dynamic water level by taking the length of the discharge pipe 3 based on the suction water level, and the difference between the height of the dynamic water level and the discharge pipe profile is the discharge at that point. It is a water column of pressure applied to the pipe.
[0021]
Between the pump position L0 (the position of the pump 2) and the position of the length B of the discharge pipe 3, that is, the intersection point A of the dynamic water level curve D and the discharge pipe profile C, the dynamic water level curve D is higher than the discharge pipe profile C. Therefore, pressure (positive pressure) is applied, and at the intersection A, the pressure applied to the discharge pipe 3 is zero. From the intersection A to the discharge end, the discharge pipe profile C is higher than the dynamic water level curve D, and the inside of the discharge pipe 3 forms a siphon with negative pressure. In addition, E shows the change of the dynamic water level after a stop.
[0022]
In the pump device of FIG. 1, if the height of the junction 4 at the other end of the air suction pipe 6 and the other end of the air supply pipe 7 is lower than the dynamic water level curve D, pressure (positive pressure) is applied to the junction 4. ), The air suction pipe 6 and the air supply pipe 7 are divided by the discharge water of the pump 2 so that the air is not supplied to the air supply pipe 7, so that the pump is formed with the siphon of the discharge pipe 3 beyond the intersection A being formed. The operation of 2 can be continued.
[0023]
FIG. 3 is a diagram showing a configuration example in the vicinity of the siphon portion of the discharge pipe of the pump device according to the present invention. In this pump device, as shown in the drawing, the connection port 5 of the discharge pipe 3 is lower than the junction 4 at the other end of the air suction pipe 6 and the other end of the air supply pipe 7.
[0024]
FIG. 4 is a diagram showing a configuration example in the vicinity of the siphon portion of the discharge pipe of the pump device according to the present invention. In the present pump device, a check valve 13 is provided in the air suction pipe 6 as illustrated. By providing the check valve 13 in the air suction pipe 6 in this way, it is possible to prevent the discharge water of the pump 2 from flowing out from the air suction pipe 6 when air remains in the siphon portion 9 at the start of pump operation.
[0025]
【The invention's effect】
As described above, according to the invention described in each claim, the following excellent effects can be obtained.
[0026]
Near the top of the discharge pipe, a confluence pipe that joins the other end of the air supply pipe and the other end of the air suction pipe at a specified height is connected to the pump discharge pipe, and after the pump is stopped, the air suction pipe automatically discharges. Since the structure is such that air is sucked into the pipe and the siphon is destroyed, when the pump is stopped, air enters the siphon portion of the discharge pipe and can be eliminated without any control.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a pump device according to the present invention.
FIG. 2 is a diagram in which the dynamic water level in a steady state is entered in the longitudinal section of the pipe line of the pump device shown in FIG.
FIG. 3 is a diagram showing a configuration example in the vicinity of a siphon portion of a discharge pipe of a pump device according to the present invention.
FIG. 4 is a diagram showing a configuration example in the vicinity of a siphon portion of a discharge pipe of a pump device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Suction water surface 2 Pump 3 Discharge pipe 4 Junction part 5 Connection port 6 Air suction pipe 7 Air supply pipe 8 Connection port 9 Siphon part 10 Discharge water surface 11 Suction water tank 12 Discharge water tank 13 Check valve

Claims (5)

A pump apparatus comprising a pump and a discharge pipe connected to the discharge port of the pump, the discharge pipe having a siphon-shaped discharge pipe that opens below the discharge water surface through a position higher than the discharge water surface. ,
The other end of the air supply pipe whose one end is connected near the top of the siphon-shaped discharge pipe and the other end of the air suction pipe whose one end is opened to the atmosphere are joined at a specified height to form a single joining pipe, Connecting a junction pipe to the pump discharge pipe,
During the operation of the pump, the operation is continued while the siphon is formed without sucking air into the pump discharge pipe due to the dynamic water level of the discharged water, and after the pump is stopped, the air is automatically sucked into the discharge pipe by the air suction pipe. A pump device characterized in that it is configured to destroy. The pump device according to claim 1,
A pump device characterized in that a specified height for joining the air supply pipe and the air suction pipe is lower than a dynamic water level of a discharge pipe connecting the join pipe. The pump device according to claim 1 or 2,
The height of the connecting portion of the discharge pipe connecting the merging pipe is the same as or lower than the height of the merging section that joins the other end of the air supply pipe and the other end of the air suction pipe. A pump device characterized. 4. The pump device according to claim 1, wherein a height of an air release end of the air suction pipe is set higher than a dynamic water level of a connection portion that connects the junction pipe to the discharge pipe. A pump device characterized. The pump device according to any one of claims 1 to 4,
A pump apparatus comprising a backflow prevention valve in the air suction pipe.

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