JP4641089B2 - Drainage pump equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage pump device, and more particularly, to a drainage pump device suitable for improving the reliability of a drainage pump station that is installed in a drainage station or the like and discharges and processes a large amount of raw water such as rainwater.
[0002]
[Prior art]
In general, the prior art relating to the cooling water system in the equipment of the drainage pump station will be described with reference to FIG. 4, taking a vertical rainwater drainage pump as an example.
[0003]
FIG. 4 is a cooling water system diagram in a conventional vertical axis rainwater drainage pump.
[0004]
In FIG. 4, 1 is a main pump, 2 is a prime mover for driving a main pump, 3 is a power transmission device (reduction gear), 14 is a pipe cooler, and this pipe cooler 14 is discharged from a discharge pipe 15 connected to the main pump 1. It is provided on the upstream side of the valve 16. Reference numeral 10 is a cooling water pump, 11 is an expansion tank for storing cooling water pumped by the pump 10, and 12 is a machine-mounted cooling water pump provided in the cooling water piping system 13.
[0005]
In this example, the main pump 1 is a so-called non-water supply type pump that does not supply shaft seal water or bearing cooling water.
[0006]
Hereinafter, the flow of the cooling water will be described.
[0007]
The cooling water pumped up by the pumping pump 10 is once stored in the expansion tank 11 and is supplied to the main pump driving motor 2 and the power transmission device 3 through the cooling water pump 12 with a natural flow or the like and supplied to each device. Cool down. Cooling water whose temperature has increased due to heat exchange accompanying equipment cooling is heat-exchanged with the handling liquid (pumped liquid) pumped by the main pump 1 by the in-pipe cooler 14 and then upstream of the on-machine cooling water pump 12. Return to the cooling water pipe 13. Such a cooling method is called an in-pipe cooler method, and is used for simplification of the cooling water system in conjunction with the dehydration of the main pump.
[0008]
By the way, for the purpose of the drainage station, reliable drainage is required at any time.
Therefore, from the viewpoint of maintaining the function of the drainage station facility and detecting the cause of failure at an early stage, so-called management operation is usually performed to confirm the function of the equipment at the drainage station at normal times. In this management operation, it is most preferable to reproduce the actual operation state of each device. However, depending on factors such as the size of the drainage station and the surrounding situation, only a partial device management operation can be performed in many cases.
[0009]
Among them, there is a case where only the main pump driving prime mover 2 is operated. In this case, in the pipe cooler system shown in FIG. 4, the pipe cooler 14 is installed in the middle of the discharge pipe 15 of the main pump 1. For this reason, in normal times when there is little rain water or the like, the amount of water for the main pump 1 is insufficient, and the cooling effect by the pumped pumping liquid cannot be obtained, and long-term management operation cannot be performed. In addition, there is a problem that the management operation of the entire system cannot be performed when the drainage operation by the main pump cannot be performed due to the drainage restriction of the river.
[0010]
On the other hand, in recent years, from the viewpoint of improving the reliability of the drainage station, so-called auxiliary equipment (for example, pumping of the cooling water system) other than the main equipment such as the main pump, the prime mover for driving the main pump, and the power transmission device (reduction gear) It is required to reduce the number of pumps.
[0011]
A reduction in the number of auxiliary equipment required for the operation of the main pump means that the cause of failure of the drainage station equipment is reduced accordingly, and as a result, the reliability of the equipment system can be improved. The in-pipe cooler system is intended to meet these requirements.
[0012]
In addition, with respect to these problems in the prior art, the main pumps can be dehydrated by using ceramic bearings in the bearings and non-water supply shaft seals in the shaft seals. It has been developed to eliminate the need for external cooling water.
[0013]
Furthermore, a gas turbine engine that does not require cooling water has also been put into practical use for the prime mover for driving the main pump, and complete dehydration of the pump equipment has been realized.
[0014]
Due to such technological advances in systems and equipment, it has become possible to eliminate the supply of cooling water, which was necessary during management operation, and to improve the reliability of the drainage station by removing auxiliary equipment. However, these systems are still expensive and need to be fully studied before they are adopted. In addition, when replacing the already installed pump equipment with the complete dehydration system, it is necessary to newly manufacture each device and it is a large-scale construction, which is very uneconomical.
[0015]
As a conventional technique capable of performing the management operation, for example, there is a means described in Japanese Utility Model Laid-Open No. 1-1141393 (Japanese Utility Model Application No. 63-38224), which enables the management operation of the entire system. However, the technique described in the above publication forms a cooling water passage of the driving device and a heat exchange water passage for heat exchange with the cooling water passage in the peripheral wall of the main pump suction cylinder, and at the heat exchange water passage inlet, The discharge port of the sub pump in which the opening end of the suction bell mouth is arranged at a position below the maximum water level at which the pump can be operated in the air is connected. In this method, since the heat exchanger is provided in the main pump itself, it is necessary to remove the main pump during maintenance of the heat exchanger, which causes a problem in maintainability. In addition, when drainage operation by the main pump is not possible due to river drainage restrictions etc., the problem that management operation of the entire system cannot be performed has not been improved.
[0016]
Further, for example, in the cooling device for the drive device of the standby standby pump described in JP-A-8-105399, a bypass circuit is provided in the circulation path of the cooling water for the drive device of the main pump, and the auxiliary cooler provided in this bypass circuit is provided. What was submerged in the bottom part of the water absorption tank is disclosed, and the water of the cooling water system is cooled with the water of the water absorption tank to prevent overheating of the drive unit.
[0017]
However, such a water tank installed type cooler is not only inferior in maintainability, but also has problems such as an influence of water quality and a decrease in cooling performance due to accumulation of foreign matters.
[0018]
[Problems to be solved by the invention]
According to the conventional in-pipe cooler system, auxiliary equipment can be reduced, but sufficient building space is required for installing the in-pipe cooler, and because it is installed in the middle of the main pipe, maintenance is not good. It was.
[0019]
The present invention has been made to solve such problems, and can reduce the number of auxiliary machines necessary for the operation of the main pump, and is excellent in maintainability and reliability with a small capital investment. It is an object of the present invention to provide a drainage pump device.
[0020]
In addition, another object of the present invention is to provide a drainage pump device that can easily perform the management operation of the entire equipment of the pumping station and has improved maintainability and reliability by making the cooling water system self-contained. There is.
[0021]
[Means for Solving the Problems]
In order to achieve the first object, the first configuration of the drainage pump device according to the present invention includes a main pump connected to a discharge pipe, a main prime mover that drives the main pump via a power transmission device, In a drainage pump device comprising at least an auxiliary machine including a cooling water system for cooling these drive systems, a branch pipe is provided on the upstream side of the discharge valve of the main pump or the discharge pipe, and a pump pump liquid is provided in the branch pipe. And a heat exchanger capable of exchanging heat between the fluid flowing in the cooling water system.
[0022]
In order to achieve the second object, a second configuration of the drainage pump device according to the present invention includes a main pump in which a suction side is located in a water absorption tank and a discharge pipe is connected, and the main pump transmits power. In a drainage pump device comprising a main prime mover driven through a device and an auxiliary machine including at least a cooling water system for cooling these drive systems, a branch pipe is provided upstream of the discharge valve of the main pump or the discharge pipe. And a heat exchanger capable of exchanging heat between the pumped liquid and the fluid flowing in the cooling water system is provided in the branch pipe, and the branch pipe is led to a water absorption tank.
[0023]
The functions of the above technical means are as follows.
[0024]
In the drainage pump device of the present invention, a heat exchanger for cooling the drive system of the device is provided in the branch pipe in the middle of the branch pipe branched from the discharge valve upstream side of the discharge pipe of the main pump. By using the branch pipe, the management operation of the entire equipment of the drainage pump station can be performed. Moreover, since heat exchange is performed by pumping the main pump, the number of auxiliary machines can be reduced, and the reliability of the equipment on the machine can be improved.
[0025]
Furthermore, if the main pump can be dehydrated through the use of ceramic bearings and non-water supply shaft seals, the reliability of the entire system can be dramatically improved by adding equipment such as heat exchangers without newly creating existing equipment. Can be improved.
[0026]
In addition, since the heat exchanger itself can be made smaller than the conventional in-pipe cooler method, the equipment is inexpensive and the installation space can be reduced, which is advantageous in terms of maintenance.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
[0028]
[Embodiment 1]
FIG. 1 is a cooling water system diagram of a drainage pump device showing an embodiment of the present invention, and FIG. 2 is a configuration diagram of a drainage pump station to which the present invention is applied. In FIG. 1, the same reference numerals as those in FIG.
[0029]
First, an outline of a drainage pump station to which the present invention is applied will be described with reference to FIG.
[0030]
In the drainage pump station shown in FIG. 2, the flowing water flowing in from the suction channel 6 is removed by a dust remover 7 to remove foreign matters having a size that hinders the operation of the pump, and is pumped up by the main pump 1 through the water tank 8. The water is discharged to the discharge water channel 9 through the discharge pipe 15. Here, the main pump 1 is a vertical axis rainwater drainage pump, for example.
[0031]
The discharge pipe 15 includes a discharge valve 16 for reducing the surge by gradually changing the flowing water when the main pump 1 is started and stopped, and for stopping the discharge side during normal time or when the main pump 1 is disassembled. A backflow prevention valve 17 for preventing backflow of running water at the time of sudden stop 1 is attached.
[0032]
The power of the main pump 1 is transmitted from the main pump driving prime mover 2 to the main pump 1 via a power transmission device (reduction gear) 3.
[0033]
The cooling water system of the drainage pump device in such a drainage station will be described with reference to FIG. 1 and 2, the same devices are assigned the same reference numerals.
[0034]
In FIG. 1, 1 is a main pump, 2 is a prime mover for driving a main pump, and 3 is a power transmission device.
[0035]
Reference numeral 11 denotes an expansion tank that stores cooling water from a water source, and 12 (a general name for 12a and 12b) is a machine-equipped cooling water pump provided in the cooling water piping system 13 (a general name for 13a and 13b).
[0036]
20 is a branch pipe branched from the upstream side of the discharge valve 16 of the discharge pipe 15 connected to the main pump 1, and this branch pipe 20 is led to the water absorption tank 8 as shown in FIG. Reference numeral 21 denotes a heat exchanger composed of 21-1, 21-2, and the heat exchanger 21 (generic name of 21-1, 21-2) is provided in the branch pipe 20.
[0037]
In this example, the main pump 1 is a so-called non-water supply type pump that does not supply shaft seal water or bearing cooling water.
[0038]
The main pump 1 receives the power generated by the prime mover 2 for driving the main pump through a power transmission device (reduction gear) 3 and pumps water. Drive systems such as the main pump driving motor 2 and the power transmission device 3 generate heat during operation, and thus supply cooling water from the expansion tank 11 through the cooling water pipe 13a using natural flow. The cooling water is supplied to the main pump driving motor 2 and the power transmission device 3 by the machine-equipped cooling water pumps 12a and 12b attached to the main pump driving motor 2, and after exchanging heat with each device. In the heat exchanger 14 (14-1, 14-2), heat exchange is performed again between the pumped liquid and the raw water flowing in the cooling water system pipe, and after returning to a predetermined water temperature, the return cooling water pipe 13b is used. Return to the expansion tank 11 upstream of the machine-equipped cooling water pump 12. These cooling water system flows are always performed during pump operation.
[0039]
According to this method, in the cooling water system, an auxiliary machine that needs to be started during pump operation, for example, a secondary cooling water system that has been conventionally required, is not required, and at least the pump shown in the prior art in FIG. No. 10 may be omitted, and when the main pump driving motor 2 is operated, the cooling water pump 12 with the machine supplies cooling water to each device. For this reason, the pump starting speed is greatly increased. In addition, since the number of auxiliary machines is reduced, the cause of troubles such as failure is reduced, so that the reliability of the drainage pump equipment is improved.
[0040]
As shown in FIG. 2, the heat exchanger 21 is installed on the ground of the drainage station, for example, on the floor where the pump is installed, and is provided on the upstream side of the discharge valve 16 of the main pump 1 or the discharge pipe 15. It is installed in the middle of the pipe 20. For this reason, as described in Japanese Patent Laid-Open No. 8-105399, the maintainability is better than the conventional water tank installation type cooler (water absorption tank / discharge tank cooler), and the installation of equipment is within the existing building dimensions. Since it can be installed, it is advantageous in terms of construction costs.
[0041]
[Embodiment 2]
FIG. 3 is a cooling water system diagram of a drainage pump device showing another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 are the same devices as those in the first embodiment, and the description thereof is omitted.
[0042]
In FIG. 3, reference numeral 8 denotes a water absorption tank, and a second branch pipe 22 is provided from the upstream side of the discharge valve 16 of the discharge pipe 15 to the water absorption tank 8 separately from the branch pipe 20.
[0043]
In the drainage pump facility shown in FIG. 3, the heat exchanger 21 (21-1, 21-2) is installed in the middle of the branch pipe 20 branched from the upstream side of the discharge valve 16 of the discharge pipe 15 connected to the main pump 1. The branch pipe 20 returns to the water absorption tank 8. Further, the second branch pipe 22 also returns to the water absorption tank 8. For this reason, if the discharge valve 16 is closed and operated, the pumped water can be returned to the water absorption tank 8 without draining to the discharge side, and the actual load operation of the pump can be performed.
[0044]
In other words, in the management operation of the drainage pump facility when the pumped water cannot be drained to the discharge water channel 9 due to the water discharge restriction or the like, the heat exchanger 21 can provide the cooling effect of the drive system even when the discharge valve 16 is closed, so that the function is maintained. Management operation to confirm Thus, since the function check of the drainage pump station can be performed for each main pump, the reliability can be improved in terms of maintaining the function of the drainage pump station.
[0045]
In addition, although the pump installation of the drainage station of this embodiment demonstrated the thing of the main machine structure which consists of a main pump, the motor for driving a main pump, and a reduction gear, it is not limited only to this structure.
[0046]
According to the embodiment of the present invention, the following effects can be obtained in the facility of the drainage pump station.
[0047]
(1) In the conventional cooling method using a water tank-installed cooler, there are problems such as the influence of water quality and a decrease in cooling performance due to the accumulation of foreign matter, and the usage conditions are restricted. On the other hand, in the embodiment of the present invention, by providing the cooler (heat exchanger) itself on land, the influence of the above-described conditions can be reduced.
[0048]
(2) A heat exchanger 21 is provided in the middle of the branch pipe 20 branched from the upstream side of the discharge valve 16 provided in the discharge pipe 15 connected to the main pump 1, and a second branch pipe 22 instead of the discharge pipe 15 is provided. By guiding to the water absorption tank 8, the entire drainage pump station can be managed without draining to the discharge water channel 9 side, and the reliability can be improved in terms of maintaining the functions of the facilities.
[0049]
(3) When remodeling an existing pumping station, the components can be made inexpensive and lightweight, so large-scale construction such as building expansion is not required, and equipment can be improved easily. .
[0050]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to reduce the number of auxiliary machines required for the operation of the main pump, and to provide a drainage pump device excellent in maintainability and reliability with a small capital investment. can do.
[0051]
In addition, according to the present invention, it is possible to provide a drainage pump device that can easily perform the management operation of the entire equipment of the pumping station and improve the maintainability and reliability by making the cooling water system self-contained. it can.
[Brief description of the drawings]
FIG. 1 is a cooling water system diagram of a drainage pump device showing an embodiment of the present invention.
FIG. 2 is a sectional view of a drainage pump station to which the present invention is applied.
FIG. 3 is a cooling water system diagram of a drainage pump device showing another embodiment of the present invention.
FIG. 4 is a cooling water system diagram in a conventional vertical axis rainwater drainage pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Main pump, 2 ... Main motor for driving main pump, 3 ... Power transmission device, 8 ... Water absorption tank, 11 ... Expansion tank, 12, 12a, 12b ... Cooling water pump with machine, 13 ... Cooling water piping system, 15 ... Discharge piping, 16 ... discharge valve, 20 ... branch pipe, 21, 21-1, 21-2 ... heat exchanger. 22: Second branch pipe.

Claims (2)

  In a drainage pump device comprising a main pump connected to a discharge pipe, a main prime mover that drives the main pump via a power transmission device, and an auxiliary machine that includes at least a cooling water system that cools these drive systems, A branch pipe is provided upstream of the main pump or the discharge valve of the discharge pipe, and a heat exchanger capable of exchanging heat between the pumped liquid and the fluid flowing in the cooling water system is provided in the branch pipe. Drainage pump device to do. From a main pump having a suction side located in a water absorption tank and connected to a discharge pipe, a main prime mover that drives the main pump via a power transmission device, and an auxiliary machine that includes at least a cooling water system that cools these drive systems In the constructed drainage pump apparatus, a branch pipe is provided on the upstream side of the discharge valve of the main pump or the discharge pipe, and heat exchange that allows heat exchange between the pumping liquid and the fluid flowing in the cooling water system is performed in the branch pipe. And a drainage pump device characterized in that the branch pipe is led to a water absorption tank.

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