JP2022059730A - Pump system - Google Patents

Abstract

To provide a submerged pump system that controls a sensor value on the ground to be a predetermined value.SOLUTION: The pump system comprises: a first communication interface 21 that is provided on the ground, is connected to an AC power source 16 via a power line 31, is driven by electric power supplied from the power line, and is connected to a sensor; and a submerged pump unit 1 that is connected to the AC power source via a power line 32, is driven by the electric power supplied from the power line, and used underwater, wherein the submerged pump unit has an inverter integrated motor 4 in which a pump 2, a motor 41 that drives the pump, and an inverter 42 that drives the motor are integrated, and a second communication interface 43 that communicates with the first communication interface using a power line communication method, the first communication interface and the second communication interface transmit and receive a command frequency according to the sensor value, and the inverter drives the motor at a motor drive frequency or a received command frequency according to a received sensor value.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pump system.

Pumping devices for transferring water in wells to ground supply destinations are known. This type of pumping device comprises a submersible pump unit located in a well and a land unit connected to the submersible pump unit through a suction pipe. The submersible pump unit includes a pump that sucks up water and an electric motor for driving the pump. The land unit includes components such as an inverter that enables the electric motor of the submersible pump unit to shift gears and a control unit that controls the operation of the inverter. When the submersible pump unit is driven, the water in the well is sent to the land unit through the suction pipe and further flows through the discharge pipe connected to the land unit.

When the use of water at the supply destination decreases and the flow rate of water flowing in the land unit drops to a predetermined value, the control unit stores water in the pressure tank provided on the discharge side of the pump, so that it is stored in the inverter. A command is issued to stop the operation of the pump after performing the accumulator operation so that the discharge side pressure becomes a predetermined pressure (stop pressure). Further, when water is used at the supply destination and the pressure on the discharge side of the pump drops to a predetermined value (starting pressure), the control unit issues a command to the inverter to start the pump. While the pump is in operation, the control unit controls the discharge side pressure of the pump by PI control. Specifically, the rotation speed command value of the motor is calculated by PI calculation based on the deviation between the discharge side pressure and the target pressure, and is output to the inverter. As a result, the pump can supply water at the discharge side pressure required for the water supply destination.

The pump device as described above is equipped with an inverter that enables the motor of the submersible pump unit to shift gears, a pressure gauge that detects the pressure on the discharge side of the pump, and a flow switch that detects the flow, and is used to drive the pump. The motor is configured to be installed underwater. Then, the pressure is controlled so that the pressure detected by the pressure sensor on the discharge side described above becomes constant, and the motor is operated at a variable speed.

U.S. Patent Publication No. 2010/12910517 U.S. Patent Publication No. 2011/131614734

On the other hand, when an inverter-integrated motor is applied to a submersible pump, the inverter that enables the motor of the submersible pump unit to shift gears is provided in water because it has an integral structure with the motor. In such a case, a sensor (for example, a pressure sensor) may be attached to the discharge side of the pump underwater, and the signal may be taken into the inverter (or control unit) of the submersible pump unit for control (for example, pressure control). ..

In the case where the pressure sensor is attached to the discharge side of the pump in the water and the signal is taken into the inverter (or control unit) of the submersible pump unit to control the pressure (see, for example, Patent Document 1 or Patent Document 2). Since the pump is submersible, a special structure is required to transmit the signal of the pressure sensor to the inverter (or control unit). As a special structure, for example, it is necessary to provide a special pipe for a signal line on the side surface of the pump.

Such a special structure needs to maintain airtightness, and it may be difficult to maintain reliability, which is a factor of cost increase. In addition, since the pressure sensor is integrated with the submersible pump, the pressure sensor itself is placed in the water, which is affected by the water depth where the pump is installed, and there is no information on the discharge side pressure on the ground. Therefore, it is difficult to control the discharge side pressure on the ground to be a predetermined pressure. As described above, when the inverter-integrated motor is applied to the submersible pump, it is difficult to control the sensor value on the ground to be a predetermined value.

The present invention has been made in view of the above problems, and is a pump system that facilitates control so that the sensor value on the ground becomes a predetermined value when an inverter-integrated motor is applied to a submersible pump. The purpose is to provide.

The pump system according to the first aspect of the present invention is provided on the ground, is connected to an AC power source via a power line, is driven by the power supplied from the power line, and is connected to a sensor. The submersible pump unit includes a communication interface and a submersible pump unit that is connected to the AC power supply via a power line and is driven by power supplied from the power line and used underwater. The submersible pump unit includes a pump and the pump. It has an inverter-integrated motor in which a motor for driving the motor and an inverter for driving the motor are integrated, and a second communication interface for communicating with the first communication interface using a power line communication method. The communication interface 1 transmits the sensor value acquired from the sensor or the command frequency corresponding to the sensor value via the power line using the power line communication method, and the second communication interface is the power line communication method. Upon receiving the sensor value or the command frequency transmitted in the above, the inverter drives the motor at the motor drive frequency corresponding to the received sensor value or the received command frequency.

According to this configuration, it is possible to control the sensor value (for example, the discharge side pressure) on the ground to be a predetermined value (for example, a predetermined pressure) without being affected by the water depth in which the pump is installed. At the same time, since the wiring for signals is thin, there is a possibility that the wiring will be broken underwater, but the wiring between the communication interface on the ground and the underwater inverter integrated motor will not be added for signals, and only the power line will be wired. This resolves this concern and improves reliability. Further, there is an advantage that a structure for attaching a sensor (for example, a pressure sensor) to the pump underwater is not required. In addition, when the sensor fails, it is not necessary to pull the pump out of the water during inspection and replacement work, which facilitates maintenance work.

The pump system according to the second aspect of the present invention is the pump system according to the first aspect, the second communication interface receives the sensor value, and the inverter-integrated motor receives the sensor value. A control unit is provided that determines the motor drive frequency accordingly and controls the inverter to drive the motor at the motor drive frequency.

According to this configuration, the pump can be driven according to the sensor value.

The pump system according to the third aspect of the present invention is the pump system according to the second aspect, wherein the sensor is a pressure sensor, and the first communication interface uses a pressure value from the sensor as a sensor value. The pressure value is acquired and transmitted via the power line using the power line communication method, the second communication interface receives the pressure value, and the control unit drives the motor according to the pressure value. The frequency is determined and the inverter is controlled to drive the motor at the motor drive frequency.

According to this configuration, it is possible to control the discharge side pressure on the ground to be a predetermined pressure without being affected by the water depth in which the pump is installed.

The pump system according to the fourth aspect of the present invention is the pump system according to the third aspect, the sensor is a plurality of pressure sensors, the first communication interface is a plurality, and each of the above-mentioned firsts. The communication interface 1 acquires pressure values from different pressure sensors, transmits each of the pressure values on the power line using a power line communication method, and the second communication interface receives a plurality of pressure values. , The control unit determines the motor drive frequency according to each pressure value.

According to this configuration, the control unit can maintain the pressure at the destination where each pressure sensor is provided.

The pump system according to the fifth aspect of the present invention is the pump system according to the first or second aspect, wherein there are a plurality of the sensors, there are a plurality of the first communication interfaces, and the first communication interface is described. Each acquires a sensor value from a different sensor, transmits each of the sensor values on the power line using a power line communication method, the second communication interface receives a plurality of sensor values, and the control unit. Determines the motor drive frequency according to the combination of the received sensor values.

According to this configuration, the control unit can maintain the pressure, flow rate, water level, etc. at the destination where each of the plurality of sensors is provided.

The pump system according to the sixth aspect of the present invention is provided on the ground, has a first communication interface connected to a sensor and capable of wireless communication, and is provided on the ground, and supplies a power line to an AC power source. A second communication interface that is connected via a power line and is driven by the power supplied from the power line and is capable of wireless communication with the first communication interface, and is connected to the AC power supply via the power line from the power line. The submersible pump unit includes a submersible pump unit driven by supplied power and used underwater, and the submersible pump unit is an inverter-integrated motor in which a pump, a motor for driving the pump, and an inverter for driving the motor are integrated. And a third communication interface for communicating with the second communication interface using the power line communication method, and the first communication interface corresponds to the sensor value acquired from the sensor or the sensor value. The command frequency is transmitted by wireless communication, the second communication interface receives the wirelessly transmitted sensor value or command frequency, and the sensor value or command frequency is transmitted via the power line using a power line communication method. The third communication interface receives the sensor value or the command frequency transmitted by the power line communication method, and the inverter receives the motor drive frequency or the reception according to the received sensor value. The motor is driven at the command frequency.

According to this configuration, the sensor value of the sensor installed in the desired area on the ground is transmitted to the submersible pump by wirelessly communicating between the first communication interface and the second communication interface. At that time, since it is not necessary to install a power line between the first communication interface and the second communication interface, the labor for installing the first communication interface can be reduced.

The pump system according to the seventh aspect of the present invention is the pump system according to the sixth aspect, wherein there are a plurality of the sensors, there are a plurality of the first communication interfaces, and each of the first communication interfaces is , Acquire sensor values from different sensors, transmit each of the sensor values by wireless communication, the second communication interface receives each of the wirelessly transmitted sensor values, and transmit each of the sensor values to a power line. It is transmitted by the power line using the communication method, and the third communication interface receives each of the sensor values transmitted by the power line communication method, and determines the motor drive frequency according to the combination of the received sensor values. It is equipped with a control unit.

According to this configuration, by wirelessly communicating between a plurality of first communication interfaces and a second communication interface, it is possible to use a plurality of desired areas on the ground (for example, fields, parks, outdoor leisure facilities, etc.). When transmitting the sensor value of each of the sensors installed in the submersible pump to the submersible pump, it is not necessary to install a power line between the plurality of first communication interfaces and the second communication interface. The labor involved in installing the communication interface can be reduced.

According to one aspect of the present invention, it is possible to control the sensor value (for example, discharge side pressure) on the ground to be a predetermined value (for example, a predetermined pressure) without being affected by the water depth in which the pump is installed. .. At the same time, since the wiring for signals is thin, there is a possibility that the wiring will be broken underwater, but the wiring between the communication interface on the ground and the underwater inverter integrated motor will not be added for signals, and only the power line will be wired. This resolves this concern and improves reliability. Further, there is an advantage that a structure for attaching a sensor (for example, a pressure sensor) to the pump underwater is not required. In addition, when the sensor fails, it is not necessary to pull the pump out of the water during inspection and replacement work, which facilitates maintenance work.

It is a schematic block diagram of the pump system which concerns on 1st Embodiment. It is a schematic block diagram of the pump system which concerns on modification 1 of 1st Embodiment. It is a schematic block diagram of the pump system which concerns on modification 2 of 1st Embodiment. It is a schematic block diagram of the pump system which concerns on modification 3 of 1st Embodiment. It is a schematic block diagram of the pump system which concerns on 2nd Embodiment.

Hereinafter, each embodiment will be described with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.

<Outline of Solution Means for One Aspect of the Present Embodiment>
In the pump system of one aspect of the present embodiment, a pressure sensor is provided in a drain pipe on the ground, and the pressure information detected by the pressure sensor is used for power line communication (also referred to as PLC) as an inverter of the submersible pump unit. (Or the control unit of the submersible pump unit), the motor is operated at a variable speed so that the pressure indicated by the pressure information becomes a predetermined pressure.

This makes it possible to control the discharge side pressure on the ground to a predetermined pressure without being affected by the water depth at which the pump is installed. At the same time, since the wiring for signals is thin, there is a possibility that it will be disconnected underwater, but the wiring between the land unit on the ground and the submersible pump unit underwater will not be added for signals, and only the power line will be wired. So, this concern is resolved and reliability is improved. Further, there is an advantage that a structure in which a sensor (for example, a pressure sensor) is specially attached to the submersible pump unit becomes unnecessary. In addition, when the sensor fails, it is not necessary to pull the pump out of the water during inspection and replacement work, which facilitates maintenance work.

FIG. 1 is a schematic configuration diagram of a pump system according to the first embodiment. As shown in FIG. 1, the pump system includes a submersible pump unit 1 installed and used in water such as in a well, and a land unit 10 connected to the submersible pump unit 1 via a suction pipe 14. The submersible pump unit 1 is connected to the AC power supply 16 via a power line 32 and is driven by the power supplied from the power line 32.

The submersible pump unit 1 includes a pump 2 having an impeller (not shown) and an inverter integrated motor 4 for driving the pump 2. The inverter-integrated motor 4 is connected to the AC power supply 16 via a power line 32, is driven by the power supplied from the power line 32, and is used underwater. The inverter-integrated motor 4 has, for example, a motor 41 in which a rotating shaft is connected to the pump 2 to drive the pump 2, an inverter 42 for driving the motor 41, and a communication interface 43. In the present embodiment, the communication interface 43 will be described as being built in the inverter integrated motor 4, but it is provided inside the submersible pump unit 1 and externally provided in the inverter integrated motor 4. May be good. Further, in the present embodiment, as an example, the inverter 42 will be described as having a control unit 421 for controlling the inverter 42 at a variable speed. The control unit 421 does not have to be built in the inverter 42, and may be provided outside the inverter 42.

Specifically, for example, the control unit 421 controls the rotation speed of the motor 41, that is, the rotation speed of the pump 2 by controlling the switching operation of the switching element constituting the inverter 42. When the motor 41 is driven by the inverter 42, the pump 2 rotates and water is sent to the land unit 10 through the suction pipe 14.

The land unit 10 is located on the ground. The land unit 10 measures the water distribution pipe 11 connected to the suction pipe 14, the flow switch 12 for detecting that the flow rate of water flowing through the water distribution pipe 11 has dropped to a predetermined value, and the discharge side pressure of the pump 2. A pressure sensor 13 is provided. The flow switch 12 and the pressure sensor 13 are connected to the water distribution pipe 11, and the pressure sensor 13 is provided on the downstream side of the flow switch 12. One end of the water distribution pipe 11 is connected to the suction pipe 14, and the other end is connected to the discharge pipe 18. A water supply device (not shown) such as a faucet is connected to the discharge pipe 18. A check valve 20 is attached to the suction pipe 14. The check valve 20 is provided to prevent backflow of water when the pump 2 is stopped. Further, in the present embodiment, the air vent pipe 34 is connected to the water distribution pipe 11, and the on-off valve 35 is arranged in the air vent pipe 34.

The land unit 10 further includes a pressure tank 15 for holding the discharge side pressure of the pump 2. The pressure tank 15 is connected to the water distribution pipe 11 and is provided on the downstream side of the pressure sensor 13. The pressure tank 15 has, for example, a rubber bladder inside the pressure-resistant container. When the discharge side pressure of the pump 2 rises, the air outside the bladder is compressed and water is stored in a pressurized state. When the pressure in the water pipe 11 decreases, the water held in the bladder is pushed out into the water pipe 11 by the compressed air. In this way, even if the pump 2 is stopped, water is supplied from the pressure tank 15 to the water pipe 11 for a while.

The land unit 10 further includes a communication interface 21, which is provided on the ground, is connected to the power line 32 via the power line 31, and has a sensor (here, as an example, a flow switch 12 and a pressure sensor). It is connected to 13). The communication interface 21 is connected to the AC power supply 16 via the power line 31, and is driven by the power supplied from the power line 31.
The communication interface 21 transmits a sensor value acquired from a sensor (here, as an example, a flow switch 12 and / or a pressure sensor 13) or a command frequency corresponding to the sensor value via a power line 31 and a power line 32 using a power line communication method. Is transmitted to the communication interface 43. Here, the command frequency is the output frequency of the commanded inverter. The communication interface 21 is also referred to as a first communication interface.

The communication interface 43 receives the sensor value or the command frequency transmitted by the communication interface 21 in the power line communication method. In the present embodiment, as an example thereof, the communication interface 43 receives the sensor value. The communication interface 43 is also referred to as a second communication interface.

The inverter 42 drives the motor 41 at the motor drive frequency or the received command frequency according to the sensor value received by the communication interface 43. In the present embodiment, as an example thereof, the communication interface 43 receives the sensor value. Therefore, as an example, the control unit 421 determines the motor drive frequency according to the sensor value and drives the motor 41 at the motor drive frequency. It controls the inverter 42. As a result, the pump can be driven according to the sensor value.

As a specific example, for example, a case where the sensor is a pressure sensor 13 will be described. In this case, the communication interface 21 acquires the pressure value from the pressure sensor 13 as a sensor value, and transmits the pressure value via the power line 31 and the power line 32 using the power line communication method. The communication interface 43 receives the pressure value, and the control unit 421 determines the motor drive frequency according to the pressure value. Specifically, for example, the control unit 421 determines the motor drive frequency by PI calculation based on the deviation between the pressure value and the target pressure. The control unit 421 controls the inverter 42 so as to drive the motor 41 at the determined motor drive frequency. This makes it possible to control the discharge side pressure on the ground to a predetermined pressure without being affected by the water depth at which the pump is installed.

As described above, the pump system S1 according to the first embodiment is provided on the ground, is connected to the AC power supply 16 via the power line 31, is driven by the power supplied from the power line 31, and is driven by a sensor (for example, a flow). A submersible pump that is connected to the AC power supply 16 via a power line 32 and is driven by the power supplied from the power line 32 to the communication interface 21 connected to the switch 12 and / or the pressure sensor 13). The unit 1 and the like are provided.
The submersible pump unit 1 communicates with the pump 2, the inverter integrated motor 4 in which the motor 41 for driving the pump 2 and the inverter 42 for driving the motor 41 are integrated, and the communication interface 21 and the power line communication method. It has a communication interface 43 and a communication interface 43. The communication interface 21 transmits the sensor value acquired from the sensor via the power lines 31 and 32 using the power line communication method. The communication interface 43 receives the sensor value transmitted by the power line communication method. The inverter 42 has a motor 41 driven at a motor drive frequency corresponding to the received sensor value.

According to this configuration, it is possible to control the sensor value (for example, the discharge side pressure) on the ground to be a predetermined value (for example, a predetermined pressure) without being affected by the water depth in which the pump is installed. At the same time, since the wiring for signals is thin, there is a possibility of disconnection in water, but wiring only for power lines without adding wiring between the communication interface 21 on the ground and the inverter integrated motor 4 underwater for signals. This resolves this concern and improves reliability. Further, there is an advantage that a structure for attaching a sensor (for example, a pressure sensor) to the pump underwater is not required. In addition, when the sensor fails, it is not necessary to pull the pump out of the water during inspection and replacement work, which facilitates maintenance work.

<Modification 1>
Subsequently, the modified example 1 according to the first embodiment will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of a pump system according to a modification 1 of the first embodiment. As shown in FIG. 2, in the pump system S1b according to the first modification according to the first embodiment, the pressure sensor 13a provided on the water distribution pipe 11a is connected to the communication interface 21a as compared with the pump system S1 of FIG. The pressure sensor 13b provided on the water distribution pipe 11b is connected to the communication interface 21b, the communication interface 21a is connected to the power line 32 via the power line 31a, and the communication interface 21b is connected to the power line 32 via the power line 31b. It is different in that it is done.

With this configuration, the communication interface 21a transmits the sensor value acquired from the pressure sensor 13a to the communication interface 43 via the power lines 31a and 32 using the power line communication method, and the communication interface 21b is acquired from the pressure sensor 13b. The sensor value is transmitted to the communication interface 43 via the power lines 31b and 32 using the power line communication method. As a result, the communication interface 43 receives the sensor values from the plurality of pressure sensors 13 by power line communication, and the control unit 421 of the inverter integrated motor 4 sets the motor at the motor drive frequency corresponding to the received sensor values. Can be driven.

In this way, the end pressure is controlled using the sensor values of a plurality of pressure sensors installed in the place where water is used. A set of pressure sensor and communication interface can be installed in the suction pipe in the building and attached to the outlet, or the communication interface can be traced to the pressure sensor already installed. Then, the control unit 421 of the submersible pump unit 1 can perform terminal pressure control for maintaining the pressure at each usage destination. Further, the inverter-integrated motor of the submersible pump unit 1 operates at a variable speed by inverter control, so that an energy saving effect can be obtained, and since it is used underwater, the motor 41 and the control unit 421 that generate heat can be cooled. can.

Although the example of two pressure sensors has been described in the modified example 1, the number of pressure sensors may be one or three or more.

As described above, in the first modification, the sensor is a plurality of pressure sensors, there are a plurality of communication interfaces provided on the ground, and each of the communication interfaces 21a and 21b acquires a pressure value from different pressure sensors 13a and 13b, respectively. Each pressure value is transmitted by a power line using a power line communication method, the communication interface 43 receives a plurality of pressure values, and the control unit 421 determines the motor drive frequency according to each pressure value.

With this configuration, the control unit 421 can maintain the pressure at the destination where each of the pressure sensors 13a and 13b is provided.

<Modification 2>
Subsequently, the modified example 2 according to the first embodiment will be described with reference to FIG. FIG. 3 is a schematic configuration diagram of the pump system according to the second modification of the first embodiment. As shown in FIG. 3, in the pump system S1c according to the second modification according to the first embodiment, the flow switch 12 provided in the water distribution pipe 11a is connected to the communication interface 21a as compared with the pump system S1 in FIG. The difference is that the pressure sensor 13b provided in the water distribution pipe 11b is connected to the communication interface 21b, and the water level sensor 19 provided in the water tank 17 is connected to the communication interface 21c. Here, the water level sensor 19 detects the water level of the water tank 17. Further, the communication interface 21a is connected to the power line 32 via the power line 31a, the communication interface 21b is connected to the power line 32 via the power line 31b, and the communication interface 21c is connected to the power line 32 via the power line 31c. It is also different in that it is. Here, WL in FIG. 3 represents the water level of the water tank 17.

With this configuration, the communication interface 21a transmits the sensor value acquired from the flow switch 12 to the communication interface 43 via the power lines 31a and 32 using the power line communication method. Further, the communication interface 21b transmits the sensor value acquired from the pressure sensor 13b to the communication interface 43 via the power lines 31b and 32 using the power line communication method. Further, the communication interface 21c transmits the sensor value (here, the water level) acquired from the water level sensor 19 to the communication interface 43 via the power lines 31c and 32 using the power line communication method.

As a result, the communication interface 43 receives the sensor values from the plurality of sensors (here, the flow switch 12, the pressure sensor 13b, and the water level sensor 19) by power line communication, and the control unit 421 of the inverter integrated motor 4 is concerned. The motor can be driven at a motor drive frequency corresponding to the received sensor value. Specifically, for example, the control unit 421 performs a PI calculation based on the first deviation between the pressure detected by the pressure sensor 13b and the target pressure and the second deviation between the water level detected by the water level sensor 19 and the target water level. For example, the motor drive frequency may be determined by a calculation (calculation that minimizes the sum of the first deviation and the second deviation).

In this way, the input from any sensor connected to the power line provided on the ground can be received by the submersible pump unit 1 and controlled by the control unit 421. Since the water level sensor 19 can also be supported, both can be supported when the target water pressure is to be maintained by the pressure sensor 13b at home and when the water level is controlled by the water level sensor 19 in a field or the like. Further, the inverter-integrated motor of the submersible pump unit 1 operates at a variable speed by inverter control, so that an energy saving effect can be obtained, and since it is used underwater, the motor 41 and the control unit 421 that generate heat can be cooled. ..

As described above, in the second modification, there are a plurality of sensors, there are a plurality of first communication interfaces provided on the ground, and each of the first communication interfaces acquires a sensor value from a different sensor, and the sensor value is obtained. Each is transmitted by the power line using the power line communication method. The communication interface 43 receives a plurality of sensor values, and the control unit 421 determines the motor drive frequency according to the combination of the sensor values.

With this configuration, the control unit 421 can maintain the pressure, flow rate, water level, etc. at the destination where each of the plurality of sensors is provided.

<Modification 3>
Subsequently, the modified example 3 according to the first embodiment will be described with reference to FIG. FIG. 4 is a schematic configuration diagram of a pump system according to a modification 3 of the first embodiment. As shown in FIG. 4, in the pump system S1d according to the modified example 3 according to the first embodiment, the pressure sensor 13 provided in the water distribution pipe 11 is connected to the communication interface 21 as compared with the pump system S1 in FIG. The difference is that an input interface 131 capable of inputting a required pressure value is provided together with the pressure sensor 13. Here, the input interface 131 may be, for example, a remote controller. Further, it is also provided with a communication interface 22 capable of wireless communication with the communication interface 21, connected to the power line 32 via the power line 33, and communicable with the communication interface 43 using the power line communication method. It's different.

The communication interface 21 may be connected to the control unit, the control unit may determine the command frequency according to the sensor value, and the communication interface 21 may transmit the determined command frequency by wireless communication. ..

As described above, the pump system S1d according to the third modification according to the first embodiment is provided on the ground, is connected to the sensor, and is provided on the ground with the communication interface 21 capable of wireless communication, and is exchanged. A communication interface 22 that is connected to the power supply 16 via a power line 33, is driven by the power supplied from the power line 33, and can wirelessly communicate with the communication interface 21, and is connected to the AC power supply 16 via the power line 32. It includes a submersible pump unit 1 that is driven by the power supplied from the power line 32 and is used underwater.

The submersible pump unit 1 communicates with the pump 2, the inverter integrated motor 4 in which the motor 41 for driving the pump 2 and the inverter 42 for driving the motor 41 are integrated, the communication interface 22, and the power line communication method. It has a communication interface 43 (also referred to as a third communication interface in this example).
The communication interface 21 transmits the sensor value acquired from the sensor or the command frequency corresponding to the sensor value by wireless communication.
The communication interface 22 receives the wirelessly transmitted sensor value or command frequency, and transmits the sensor value or the command frequency via the power line using a power line communication method.
The communication interface 43 receives the sensor value or the command frequency transmitted by the power line communication method.
The inverter 42 drives the motor 41 at the motor drive frequency corresponding to the received sensor value or the received command frequency.

With this configuration, the communication interface 21 and the communication interface 22 are supported by wireless communication, so that the sensor installed in a desired area on the ground (for example, a field, a park, an outdoor leisure facility, etc.) (Note that the sensor is When transmitting the sensor value (which can be retrofitted) to the submersible pump, it is not necessary to install a power line between the communication interface 21 and the communication interface 22, so that the labor related to the installation of the communication interface 21 can be reduced.

In the modified example 3, there is one sensor and one communication interface 21, but as in the modified example 2, there may be a plurality of sensors and a plurality of communication interfaces 21. In that case, in the pump system, the communication interface 22 (also referred to as a second communication interface) provided on the ground may be provided with a control unit, and the sensor values of a plurality of sensors provided on the ground are collected. It is also good. In this case, the communication between the communication interface 22 and each sensor corresponds to various wireless communications. That is, the communication interface 22 can wirelessly communicate with each of the communication interfaces 21 (also referred to as the first communication interface) connected to each sensor. As a result, the sensor values of various sensors installed in a specific area on the ground (for example, fields, parks, outdoor leisure facilities, etc.) (various sensors can be retrofitted) are connected to the communication interface 21 connected to the sensors. The communication interface 22 may be collected by the communication interface 22 and connected to the submersible pump unit 1 by a power line, and each of the sensor values collected by the power line communication method may be transmitted to the submersible pump unit 1. This makes it possible to construct a highly versatile pump system. Although the communication interface 22 has been described as being integrated with the control unit, it may be separate.

As described above, there are a plurality of the sensors, a plurality of communication interfaces 21, each of the communication interfaces acquires a sensor value from a different sensor, and each of the sensor values is transmitted by wireless communication. The communication interface 22 receives each of the wirelessly transmitted sensor values, and transmits each of the sensor values by the power line using the power line communication method. The communication interface 43 receives each of the sensor values transmitted by the power line communication method. The control unit 421 of the submersible pump unit determines the motor drive frequency according to the combination of the received sensor values.

With this configuration, by wirelessly communicating between the plurality of communication interfaces 21 and the communication interface 22, each sensor installed in a plurality of desired areas on the ground (for example, a field, a park, an outdoor leisure facility, etc.) When transmitting the sensor value of the above to the submersible pump, it is not necessary to install a power line between the plurality of communication interfaces 21 and the communication interface 22, so that the labor for installing the plurality of communication interfaces 21 can be reduced. can.

<Second embodiment>
Subsequently, the second embodiment will be described with reference to FIG. FIG. 5 is a schematic configuration diagram of the pump system according to the second embodiment. As shown in FIG. 5, the pump system S2 according to the second embodiment is not provided with a control unit in the inverter integrated motor 4b of the submersible pump unit 1b as compared with the pump system S1 of FIG. Instead, the land unit 10b is different in that a control unit 23 connected to the communication interface 21 is provided, and the flow switch 12 and the pressure sensor 13 are connected to the control unit 23. The control unit 23 determines a command frequency according to the sensor value acquired from the flow switch 12 and / or the pressure sensor 13, and uses the power line communication method to transmit the determined command frequency via the power lines 31 and 32 as a communication interface. Send from 21. In this case, the communication interface 43 receives the command frequency transmitted by the power line communication method. Then, the inverter 42 drives the motor 41 at the received command frequency.

According to this configuration, it is possible to control the sensor value (for example, the discharge side pressure) on the ground to be a predetermined value (for example, a predetermined pressure) without being affected by the water depth in which the pump is installed. At the same time, since the wiring for signals is thin, there is a possibility that the wiring will be broken underwater, but the wiring between the communication interface on the ground and the underwater inverter integrated motor will not be added for signals, and only the power line will be wired. This resolves this concern and improves reliability. Further, there is an advantage that a structure for attaching a sensor (for example, a pressure sensor) to the pump underwater is not required. In addition, when the sensor fails, it is not necessary to pull the pump out of the water during inspection and replacement work, which facilitates maintenance work.

As described above, the present invention is not limited to the above embodiment as it is, and at the implementation stage, the components can be modified and embodied within a range that does not deviate from the gist thereof. In addition, various inventions can be formed by an appropriate combination of the plurality of components disclosed in the above-described embodiment. For example, some components may be removed from all the components shown in the embodiments. Further, components over different embodiments may be combined as appropriate.

1 Submersible pump unit 10, 10b Land unit 11, 11a, 11b Water distribution pipe 12 Flow switch 13, 13a, 13b Pressure sensor 131 Input interface 14 Suction pipe 15 Pressure tank 16 AC power supply 17 Water tank 18 Discharge pipe 19 Water level sensor 2 Pump 21, 21a, 21b Communication interface 22 Communication interface 23 Control unit 31, 31a, 31b, 31c, 32, 33 Power line 34 Air vent pipe 35 On-off valve 4 Inverter integrated motor 41 Motor 42 Inverter 421 Control unit 43 Communication interfaces S1, S1b, S1c, S1d, S2 pump system

Claims (7)

A first communication interface provided on the ground, connected to an AC power source via a power line, driven by the power supplied from the power line, and connected to a sensor.
A submersible pump unit that is connected to the AC power supply via a power line and is driven by the power supplied from the power line and used underwater.
Equipped with
The submersible pump unit communicates with a pump, an inverter-integrated motor in which a motor for driving the pump and an inverter for driving the motor are integrated, with the first communication interface and a second communication method using a power line communication method. Has a communication interface, and has
The first communication interface transmits a sensor value acquired from the sensor or a command frequency corresponding to the sensor value via the power line using a power line communication method.
The second communication interface receives the sensor value or the command frequency transmitted by the power line communication method, and receives the command frequency.
The inverter is a pump system that drives the motor at the motor drive frequency corresponding to the received sensor value or the received command frequency. The second communication interface receives the sensor value and receives the sensor value.
The inverter-integrated motor
The pump system according to claim 1, further comprising a control unit that determines a motor drive frequency according to a sensor value and controls an inverter to drive the motor at the motor drive frequency. The sensor is a pressure sensor.
The first communication interface acquires a pressure value from the sensor as a sensor value, and transmits the pressure value via the power line using a power line communication method.
The second communication interface receives the pressure value and receives the pressure value.
The pump system according to claim 2, wherein the control unit determines a motor drive frequency according to the pressure value, and controls an inverter to drive the motor at the motor drive frequency. The sensor is a plurality of pressure sensors.
There are a plurality of the first communication interfaces, and there are a plurality of the first communication interfaces.
Each of the first communication interfaces acquires a pressure value from a different pressure sensor, and transmits each of the pressure values by the power line using a power line communication method.
The second communication interface receives a plurality of pressure values and receives a plurality of pressure values.
The pump system according to claim 3, wherein the control unit determines a motor drive frequency according to each pressure value. There are multiple sensors
There are a plurality of the first communication interfaces, and there are a plurality of the first communication interfaces.
Each of the first communication interfaces acquires a sensor value from a different sensor, and transmits each of the sensor values by the power line using a power line communication method.
The second communication interface receives a plurality of sensor values and receives a plurality of sensor values.
The pump system according to claim 1 or 2, wherein the control unit determines a motor drive frequency according to a combination of received sensor values. A first communication interface that is installed on the ground, is connected to a sensor, and is capable of wireless communication.
A second communication interface provided on the ground, connected to an AC power source via a power line, driven by the power supplied from the power line, and capable of wireless communication with the first communication interface,
A submersible pump unit that is connected to the AC power supply via a power line and is driven by the power supplied from the power line and used underwater.
Equipped with
The submersible pump unit communicates with a pump, an inverter-integrated motor in which a motor for driving the pump and an inverter for driving the motor are integrated, and a second communication interface using a power line communication method. Has a communication interface, and has
The first communication interface transmits a sensor value acquired from the sensor or a command frequency corresponding to the sensor value by wireless communication.
The second communication interface receives the wirelessly transmitted sensor value or command frequency, and transmits the sensor value or command frequency via the power line using a power line communication method.
The third communication interface receives the sensor value or the command frequency transmitted by the power line communication method, and receives the command frequency.
The inverter is a pump system that drives the motor at the motor drive frequency corresponding to the received sensor value or the received command frequency. There are multiple sensors
There are a plurality of the first communication interfaces, and there are a plurality of the first communication interfaces.
Each of the first communication interfaces acquires a sensor value from a different sensor, and transmits each of the sensor values by wireless communication.
The second communication interface receives each of the wirelessly transmitted sensor values, and transmits each of the sensor values by the power line using a power line communication method.
The third communication interface receives each of the sensor values transmitted by the power line communication method, and receives each of the sensor values.
The pump system according to claim 6, further comprising a control unit that determines a motor drive frequency according to the combination of received sensor values.

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