JPH09273476A - Feed water pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb an assembly dimension error generated in assembly of respective members so as to surely connect pipes with ease. SOLUTION: A feed water pump device is provided with a suction communication pipe 50 which communicates respective pump suction ports of two pumps 20, 25 mutually into a single pipe, a discharge communication pipe 60 which communicates respective pump discharge ports of the two pumps 20, 25 mutually into a single pipe, and a bypass communication pipe connecting the suction communication pipe 50 and the discharge communication pipe 60 together. In the suction communication pipe 50 divided between the two pumps 20, 25, the divided parts are connected together by means of a flange connection A. Connection between the discharge communication pipe 60 and the bypass communication pipe 70 is also carried out by means of a flange connection B. In each of other pipes, connection is carried out by means of a flange connection. In each of the flange connections A, B, a bolt hole diameter of the flange is formed larger than the diameter matched with a screw outside diameter of a bolt to be inserted, so that connection can be carried out if the connecting both flange faces are deflected from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is connected to each pump suction port of a plurality of pumps to collect them into one pipe, and is also connected to each pump discharge port to connect them.
The present invention relates to a water supply pump device that is assembled in a book pipe.

[0002]

2. Description of the Related Art Conventionally, there is a water supply pump device that appropriately operates a plurality of water supply pumps so as to adjust the amount of water supply according to the amount of water used.

FIG. 5 shows a conventional water supply pump device of this type.
It is a figure which shows an example, the figure (a) is a top view, the figure (b) is a front view, and the figure (c) is a side view.

This water supply pump device has two
Table pumps 83, 85 and respective pumps 83, 85
The two electric motors 87, 89 for driving the
And the pump suction ports of the two pumps 83 and 85 are respectively screwed into the suction ports 101 and 103, and one suction communication pipe 93 is flange-connected to the two pumps 8 and 85.
One discharge communication pipe 9 for each 3,85 pump discharge ports
5, a bypass communication pipe 97 is attached to the discharge communication pipe 95 integrally with the discharge communication pipe 95, and the bypass communication pipe 97 is connected to the suction communication pipe 93 via a check valve 99. It is configured.

On the suction communication pipe 93 side, there is one collective suction port 1
11 is provided, and one collective discharge port 113 is provided on the bypass communication pipe 97 side.

The check valve 99 is also connected to the bypass communication pipe 97 and the suction communication pipe 93 by flange connection. The check valve 99 is attached so that only the fluid can flow from the suction communication pipe 93 toward the bypass communication pipe 97.

When the pumps 83, 85 are driven, the water sucked from the collective suction port 111 into the suction communication pipe 93 is pumped by the pumps 83, 85, the discharge communication pipe 95 and the bypass communication pipe 9.
It is discharged from the collective discharge port 113 through 7.

It should be noted that by connecting one suction communication pipe 93 and one discharge communication pipe 95, the collective suction port 111 and the collective discharge port 113 of the entire water supply pump device are configured to be one each. One pressure sensor (not shown) attached to each of the suction side pipe and the discharge side pipe for use in controlling the operation of the pumps 83 and 85 is sufficient, and the two pumps 83 and 85 are separately provided. This is because it is not necessary to attach the pipes, and the number of pipes connected to the water supply pump device is one on the suction side and one on the discharge side, so that the pipe connection work at the destination of use can be simplified.

Further, the bypass communication pipe 97 and the check valve 99 are provided because the pumps 83, 8 are provided when the water pressure in the suction communication pipe 93 becomes higher than the water pressure in the discharge communication pipe 95.
5 directly from the suction communication pipe 93 to the discharge communication pipe 95
This is to supply water to.

[0010]

However, the above-mentioned conventional example has the following problems. The screw-in valves 101 and 103 are mounted by screwing between the suction communication pipe 93 and the flange connecting portions on the pump 83 and 85 side. However, in order to secure the sealing performance against water leakage of the screw-in portions, a large screw-in amount is required. An error occurs, which causes the screw-in valves 101, 1
A large error may occur in the position of 03 after assembly. Further, when the pumps 83 and 85 are mounted on the base 81, a dimensional error may occur at the mounting position.

In any case, the pump 8
When connecting the suction communication pipe 93 and the discharge communication pipe 95 to 3, 85, the positions of the respective flange connection parts do not match and the assembly is impossible, or water leakage occurs from the flange connection part even if the assembly is possible. There was a problem such as doing.

A check valve 99 is attached between the suction communication pipe 93 and the bypass communication pipe 97, but the height of the pipe is increased by the addition of the check valve 99, and the entire device is enlarged, In addition, the piping structure becomes complicated.

As in this conventional example, the suction communication pipe 93 is
In the case of the book assembly piping, if the direction of the assembly suction port 111 is changed according to the user's request, additional parts may be required, or the suction communication pipe 9 of another shape may be required.
It becomes necessary to replace it with 3, and the piping connection work is complicated, resulting in an increase in equipment cost.

The present invention has been made in view of the above points, and an object thereof is to absorb the dimensional error even if an assembly dimensional error occurs at the mounting position of each member and to connect the pipe easily and surely. Also, even if a check valve is attached, the height of the piping does not become high and the piping structure does not become complicated, and if the direction of the collective suction port is changed according to the user's request, add a part or replace it with another part. It is to provide a water supply pump device that does not require the above.

[0015]

In order to solve the above problems, the present invention provides a plurality of pumps that are rotationally driven by an electric motor, a base on which the plurality of pumps are mounted, and a plurality of the pumps. Suction communication pipes that communicate with each other through the pump suction ports and collect into one pipe, discharge communication pipes that communicate with each other through the pump discharge ports of the plurality of pumps and collect into one pipe, and the suction communication pipe and discharge communication pipe. A bypass communication pipe connecting between the pipes, and a check valve attached in the middle of the pipe extending from the suction communication pipe to the bypass communication pipe, which allows only the flow of fluid from the suction communication pipe toward the bypass communication pipe. In a water supply pump device comprising: a connection between the suction communication pipe and each pump suction port, a connection between the discharge communication pipe and a bypass communication pipe, and a connection between the suction communication pipe and the bypass communication pipe, These are also directly or indirectly connected via another member by a flange connection, and further, the suction communication pipe is divided at a portion between the plurality of pumps, and the divided portions are respectively connected by a flange connection. I decided to do it.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1A and 1B are views showing a water supply pump device according to a first embodiment of the present invention. FIG. 1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a side view.

As shown in the figure, this water supply pump device is
A substantially cylindrical pressure tank 15 is placed and fixed in the center of the plate-shaped base 10, and a first pump 20 and a second pump 25 are placed and fixed on both sides of the pressure tank 15, respectively.
An electric motor 3 for rotating and driving the first and second pumps 20 and 25 respectively behind the first and second pumps 20 and 25.
0 and 35 are mounted and fixed, and a control panel 40 is arranged directly above the pressure tank 15 so as to be straddled by stays 41 and 41.

A suction communication pipe 50 is connected to the pump suction ports of the first and second pumps 20 and 25 with screw valves 45 and 46 interposed, respectively. One end of each of these screw-in valves 45 and 46 is the suction communication pipe 5
0 and the other ends are screwed into the pipes 47 and 48. The pipes 47 and 48 are both the first and second pumps 2
It is flanged to the 0, 25 pump inlets.

The suction communication pipe 50 connects the respective pump suction ports of the first and second pumps 20 and 25 and collects them into one.

A discharge communication pipe 60 is flange-connected to the pump discharge ports of the first and second pumps 20 and 25, respectively.

The discharge communication pipe 60 connects the pump discharge ports of the first and second pumps 20 and 25, respectively, and collects them into one.

A bypass communication pipe 70 is connected to the central portion of the suction communication pipe 50 and the discharge side end portion of the center of the discharge communication pipe 60 so as to connect them. The bypass communication pipe 70 is provided with a collective discharge port 71.

A check valve 150 is attached to the connecting portion between the suction communication pipe 50 and the bypass communication pipe 70.
The check valve 150 is attached so as to allow only the flow of fluid from the suction communication pipe 50 toward the bypass communication pipe 70. The check valve 150 is connected to the suction communication pipe 50 and the bypass communication pipe 70 by flange connection.

Further, the discharge communication pipe 60 and the bypass communication pipe 70
Flange connection is also used for connection with.

By the way, the suction communication pipe 5 in this embodiment
0 is divided into two at the portion between the first and second pumps 20 and 25. More specifically, it is divided so that the connection portion with the bypass communication pipe 70 is located on the second pump 25 side. The divided parts are connected by a flange connection A.

Moreover, flanged openings are provided at both ends of the suction communication pipe 50, and the opening on the left side of the both end openings is one of the collective suction ports 1 of the entire water feed pump device.
As 60, a single pipe 170 on the suction side is flange-connected, and the opening on the right side is closed by a closing flange 180. The flanges provided at the openings at both ends have the same size and the same shape.

By the way, in this embodiment, the flange connection A portion connecting the divided portions of the suction communication pipe 50, the flange connection B portion connecting the discharge communication pipe 60 and the bypass communication pipe 70 to the other flange connection portions. The structure is different.

That is, the flange connection is performed by inserting a screw of a bolt into a bolt hole provided in both joined flanges and sandwiching the both flanges with the bolt and the nut, but usually the diameter of the bolt hole is inserted. The diameter is adapted to the screw outer diameter of the bolt.

On the other hand, these flange connections A, B
In the portion, as shown in FIG. 2, the inner diameters of the bolt holes 200 and 210 respectively provided in both flanges to be joined are formed to be larger than the diameter adapted to the screw outer diameter of the bolt 220 to be inserted. That is, as shown in FIG. 2, even if the surfaces of both flanges to be joined are slightly displaced, the connection is possible. With such a configuration, the following effects occur.

That is, the screw-in valves 45, 4 shown in FIG.
When 6 is screwed into the suction communication pipe 50 and the pipes 47 and 48,
In order to secure the sealing property against the water leakage, over-screwing may occur rather than the design size, and thus a large error may occur in the size after the screwing.

Further, the pumps 20 and 25 may not be accurately and symmetrically fixed on the base 10, and the positions of the two may be displaced.

When each pipe is connected to the pumps 20 and 25, the dimensional error is caused by the flange connection A,
It can be absorbed by translating the flange connection surface of the portion B and shifting it. Therefore, each pipe can be connected reliably. Since the flange connection surfaces of the two flange connections A and B are orthogonal to each other, it is possible to cope with a deviation in any direction, which is preferable.

The flange connection structure of the structure shown in FIG. 2 may be applied to other flange connection parts other than the above flange connections A and B. Select which flange connection to apply as required.

By the way, in the present embodiment, when the position of the collective suction port 160 of the suction communication pipe 50 is to be provided on the opposite side by 180 °, as shown in FIG. 3, a closing flange 180 is provided on the left end portion of the suction communication pipe 50. Attached to the opening of the pipe 17
0 may be attached to the opening at the right end. As described above, the flanges provided at the openings at both ends are formed to have the same size and the same shape, so that the mounting position can be easily changed.

FIG. 4 is a diagram showing a water supply pump device according to a second embodiment of the present invention. FIG. 4 (a) is a plan view, FIG. 4 (b) is a front view, and FIG. 4 (c) is a side view. Is. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

This embodiment differs from the first embodiment in the structure of the suction communication pipe 50-2 and the check valve 150.
-2 structure only.

That is, the suction communication pipe 50-2 has three parts a,
It is divided into parts b and c, that is, parts a and c connected to the two pumps 20 and 25 and a part b connected to the bypass communication pipe 70, respectively. The divided pipes a, b and c are connected by flange connections D and E, respectively.

Further, the suction communication pipe 50-2 divided into three parts.
The parts a and c connected to the respective pumps 20 and 25 in
The parts b are formed to have the same size and the same shape, and the portion b connected to the bypass communication pipe 70 is formed to have a bilaterally symmetrical shape.

If the dimensions a and c of the pipes a and c on both sides are the same, the parts can be commonly used.

In this embodiment, the structure of the flange connection D and E and the structure of the flange connection B connecting the discharge communication pipe 60 and the bypass communication pipe 70 are formed into the structure shown in FIG. There is. Therefore, even if a dimensional error occurs in the position of each assembled member, the flanges B, D, and E absorb the dimensional error, and the respective pipes can be reliably connected.

Next, the check valve 150-in this embodiment
2 is attached so as to be directly incorporated inside the bypass communication pipe 70. Therefore, the bypass communication pipe 70 and the suction communication pipe 50-2 are directly connected by a flange connection.

With this structure, the bypass communication pipe 7
0 and the suction communication pipe 50-2 do not need to connect the pipe for the check valve 150 as in the first embodiment, and accordingly, compared to the first embodiment, the entire pipe The height can be reduced. The check valve 150-2 may be built in the suction communication pipe 50-2 side, or may be built in the flange connection portion of the bypass communication pipe 70 and the suction communication pipe 50-2.

The number of pumps attached in the present invention is not limited to two.

[0044]

As described in detail above, according to the present invention, a flange connection is used to connect each portion of the suction communication pipe, the discharge communication pipe, and the bypass communication pipe, and the suction communication pipe is divided into the above-mentioned divided parts. Since the flange connection is used for connecting the parts, the following excellent effects are obtained. Each member such as a pump mounted on the base by forming the diameter of the bolt hole of the flange of one of the flange connection parts to be larger than the screw outer diameter of the bolt to be inserted. Even if a mounting dimensional error occurs at the mounting position, the flange connection structure absorbs this dimensional error, and each pipe can be connected easily and reliably.

By incorporating a check valve inside the suction communication pipe or the bypass communication pipe at the portion where the suction communication pipe and the bypass communication pipe are connected, the piping structure is simplified and the height of the entire assembled pipe is increased. Can be lowered.

By forming openings with flanges at both ends of the suction communication pipe, and by arranging the flanges provided at the openings at both ends with the same size and shape, the position of one collective suction port of the entire water supply pump device can be changed. Can be easily done without adding additional parts.

By forming the portions of the divided portions of the suction communication pipe connected to the respective pump suction ports to have the same size and the same shape, the parts can be shared.

[Brief description of drawings]

FIG. 1 is a diagram showing a water supply pump device according to a first embodiment of the present invention, FIG. 1 (a) is a plan view, FIG. 1 (b) is a front view, and FIG. 1 (c) is a side view. .

FIG. 2 is a schematic side sectional view showing the structure of flange connections A and B.

FIG. 3 is a diagram showing another example of use of the water supply pump.

4A and 4B are diagrams showing a water supply pump device according to a second embodiment of the present invention, wherein FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a side view. .

FIG. 5 is a diagram showing an example of a conventional water supply pump device,
FIG. 2A is a plan view, FIG. 2B is a front view, and FIG.
Is a side view.

[Explanation of symbols]

 10 Base 20 First Pump 25 Second Pump 30, 35 Electric Motor 50 Suction Communication Pipe 60 Discharge Communication Pipe 70 Bypass Communication Pipe 150 Check Valve 160 Collecting Suction Port 180 Closing Flange 200, 210 Bolt Hole 220 Bolt

Claims (6)

[Claims] 1. A plurality of pumps rotationally driven by an electric motor, a base on which the plurality of pumps are mounted, and respective pump suction ports of the plurality of pumps communicate with each other to form a suction communication. A pipe, a discharge communication pipe that communicates the pump discharge ports of the plurality of pumps and collects them into one, a bypass communication pipe that connects between the suction communication pipe and the discharge communication pipe, and the suction communication pipe From the suction communication pipe to the bypass communication pipe, and a check valve that enables only the flow of the fluid from the suction communication pipe toward the bypass communication pipe, the suction communication pipe and each pump. The connection with the suction port, the connection between the discharge communication pipe and the bypass communication pipe, and the connection between the suction communication pipe and the bypass communication pipe are both flanged directly or indirectly through another member. The feed water pump device is characterized in that the suction communication pipe is divided at a portion between the plurality of pumps, and the divided portions are connected by a flange connection. 2. A plurality of pumps rotationally driven by an electric motor, a base on which the plurality of pumps are mounted, and respective suction ports of the plurality of pumps that communicate with each other to form a suction communication. A pipe, a discharge communication pipe that communicates the pump discharge ports of the plurality of pumps and collects them into one, a bypass communication pipe that connects between the suction communication pipe and the discharge communication pipe, and the suction communication pipe From the suction communication pipe to the bypass communication pipe, and a check valve that enables only the flow of the fluid from the suction communication pipe toward the bypass communication pipe, the suction communication pipe and each pump. The connection with the suction port, the connection between the discharge communication pipe and the bypass communication pipe, and the connection between the suction communication pipe and the bypass communication pipe are both flanged directly or indirectly through another member. The suction communication pipe is further divided into a portion connected to each pump suction port of the plurality of pumps and a portion connected to the bypass communication pipe, and the divided portion. The water supply pump device is characterized in that each of them is connected by a flange connection. 3. The water supply pump device according to claim 1, wherein the check valve is built in the suction communication pipe or the bypass communication pipe. 4. One of the flange connecting portions of the flange connecting portions is formed such that a diameter of a bolt hole formed in both flanges to be joined is larger than a diameter adapted to a screw outer diameter of a bolt to be inserted. 3. Even if the surfaces of both flanges to be joined are displaced, the screw of the bolt can be inserted into the bolt hole of the both flanges, and the two flanges can be clamped by the bolt and the nut. The described water supply pump device. 5. A flanged opening is provided at both ends of the suction communication pipe, one of the both openings serves as one collective suction opening of the entire water supply pump device, and the other of the both openings is closed. The water feed pump device according to claim 1 or 2, wherein the flanges, which are closed by a flange and which are provided on both of the openings, have the same size and the same shape. 6. The part connected to each pump suction port in each part of the divided suction communication pipes is formed to have the same size and the same shape. Water pump equipment.