JP2023039686A - Water supply device and control panel - Google Patents

Abstract

To provide a water supply device and a control panel capable of preventing occurrence of water hammering in a case where a pipe is not filled with water.SOLUTION: A water supply device 1 includes: a pump 21; a motor 22 for driving the pump 21; a driving device 31 for driving the motor 22 at variable speed; a check valve 23 disposed at a secondary side of the pump 21; a pressure accumulator 14 disposed at a secondary side of the check valve 23; and a control portion 32 controlling the driving device 31 to start the pump 21 by a normal starting operation when a flow rate detection device 15 detecting flow of water discharged from the pressure accumulator 14 detects the flow of the water discharged from the pressure accumulator 14 when a starting condition of the pump 21 is established, and controlling the driving device 31 to start the pump 21 by a protection starting operation as a starting operation more moderate than the normal starting operation, when the flow rate detection device 15 does not detect the flow of the water discharged from the pressure accumulator 14 when the starting condition of the pump 21 is established.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a water supply system for supplying water to a building and a control panel for the water supply system.

BACKGROUND OF THE INVENTION At present, water supply systems using pumps are known for supplying water to buildings. Such a water supply apparatus is known to perform target pressure constant control in order to supply water to a water supply destination in a building at a predetermined pressure. For example, when a water supply system is introduced into a building, or after the water supply system is stopped due to a power failure or failure of the water supply system, air may exist in the pipes of the building. When the water supply system is driven with air in the pipes, the air is compressed by the water sent out by the pump, increasing the pressure of the air, and the increased pressure of the air is transmitted to the water, causing water hammer. there is a risk of

Therefore, in order to suppress the occurrence of water hammer, when the pump is started for the first time after the water supply system is stopped due to a power failure or failure of the water supply system, the acceleration time of the rotation speed of the pump is lengthened to reduce the pressure on the discharge side. There is known a water supply device that performs a protective start-up operation in which the increase in the temperature is gentler than that of a normal start-up operation (see, for example, Patent Document 1).

JP 2014-31796 A

Even after a power failure or stoppage of the water supply system, water hammer does not occur when the pipes are filled with water. However, in the water supply apparatus described above, the protective start-up operation is performed even under conditions where water hammer does not occur. Therefore, it is required to perform the protective starting operation under the condition that the pipe is not filled with water.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a water supply apparatus capable of preventing the occurrence of water hammer when the pipe is not filled with water.

A water supply device according to an aspect of the present invention includes a pump, a motor that drives the pump, a driving device that drives the motor at variable speeds, a check valve provided on the secondary side of the pump, and the reverse A pressure accumulator provided on the secondary side of the stop valve, and a flow rate detection device for detecting the flow of water discharged from the pressure accumulator when the start condition of the pump is satisfied, detects the flow of water discharged from the pressure accumulator. is detected, the drive device is controlled to start the pump in a normal starting operation, and when the starting conditions for the pump are satisfied, the flow rate detection device detects the flow of water discharged from the pressure accumulator. and a control unit that, when not detected, controls the driving device to start the pump by a protective starting operation that is a gentler starting operation than the normal starting operation.

ADVANTAGE OF THE INVENTION According to this invention, the water supply apparatus which can prevent generation|occurrence|production of a water hammer can be provided when water is not filled in piping.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows typically the structure of the water supply apparatus which concerns on one Embodiment of this invention. Explanatory drawing which shows the structure of the same water supply apparatus typically. Explanatory drawing which shows typically the structure of the control apparatus of the same water supply apparatus. The flow chart which shows an example of the control method of the same water supply apparatus. Explanatory drawing showing an example of normal starting operation of the same water supply device Explanatory drawing which shows an example of the starting operation of the conventional water supply apparatus. Explanatory drawing which shows an example of the protection start-up operation of the water supply apparatus which concerns on one Embodiment. Explanatory drawing showing the drive and stop of the pump unit in the protection starting operation of the water supply apparatus and the target pressure constant control according to another embodiment of the present invention in a time chart. Explanatory drawing which shows typically the structure of the water supply apparatus which concerns on other embodiment of this invention. Explanatory drawing which shows typically the structure of the water supply apparatus which concerns on other embodiment of this invention.

A water supply device 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 7. FIG.
FIG. 1 is an explanatory diagram schematically showing the configuration of a water supply device 1 according to one embodiment of the present invention, and FIG. 2 is an explanatory diagram schematically showing the configuration of the water supply device 1. As shown in FIG. FIG. 3 is an explanatory diagram schematically showing the configuration of the control device 19 used in the water supply device 1, and FIG. 4 is a flow chart showing an example of control of the water supply device. FIG. 5 is an explanatory diagram showing an example of the normal starting operation of the water supply device 1, FIG. 6 is an explanatory diagram showing an example of the conventional starting operation of the water supply device, and FIG. FIG. 10 is an explanatory diagram showing an example of a protection start-up operation;

As shown in FIG. 1, the water supply apparatus 1 has a primary side connected to a water source 100 such as a water main or a water tank, and a secondary side connected to a water supply pipe 210 of a building 200 to which water is to be supplied. The water supply device 1 increases the pressure of water from the water source 100 and supplies it to a water tap 220 such as a faucet or shower head connected to a water supply pipe 210 . When the water supply device 1 is connected to the water main pipe 110 as the water source 100, the primary side is connected to the water main pipe 110 via a water meter 120 such as a meter unit. In this embodiment, the water supply device 1 is connected to the water main pipe 110 via the water meter 120. As shown in FIG. The water supply pipe 210 includes a standpipe 211 and a horizontal pipe 212 branched from the standpipe 211 and connected to the water tap 220 .

As shown in FIGS. 1 and 2, the water supply device 1 includes a pump unit 11, a first flow rate detection device 12 provided in the pump unit 11, and a pressure detection device 13 provided on the secondary side of the pump unit 11. , the pressure accumulator 14 provided on the secondary side of the pump unit 11, the second flow rate detection device 15 provided between the pressure accumulator 14 and the water supply pipe 210 (water supply destination), and the pump unit 11 are controlled. and a control device 19 .

A single or a plurality of pump units 11 are provided. In this embodiment, as shown in FIG. 2, an example in which two pump units 11 are provided will be described. The two pump units 11 are connected in parallel. In other words, the primary side of the two pump units 11 is connected to the branch pipe 16 , and the primary side of the branched portion of the branch pipe 16 is connected to the water meter 120 . A junction pipe 17 is connected to the secondary side of the two pump units 11 , and the secondary side of the junction of the junction pipe 17 is connected to the water supply pipe 210 . In addition, the confluence pipe 17 has a branch portion 17b that branches in two directions on the secondary side of the confluence portion 17a. A branch pipe 17d is provided. The pipe 17 c is connected to the water supply pipe 210 to which water is supplied, and the branch pipe 17 d is connected to the pressure accumulator 14 .

The pump unit 11 includes a pump 21 , a motor 22 and a check valve 23 . The pump unit 11 has on-off valves, which are formed on the primary side of the pump 21 and the secondary side of the check valve 23 so as to be able to manually open and close the flow path, are used in a normally open state, and are closed for maintenance and the like. It's okay to be there. The pump 21 is driven to increase the pressure of water and supply it to the secondary side. Motor 22 drives pump 21 . The motor 22 has, for example, a stator, a rotor and a motor shaft, and the motor shaft is connected to the rotary shaft of the pump 21 . Motor 22 is connected to controller 19 .

A check valve 23 is provided on the secondary side of the pump 21 . As a specific example, it is provided at the discharge port of the pump 21 or at the piping on the secondary side of the discharge port to prevent backflow of water to the pump 21 side.

The first flow detection device 12 is a flow sensor. The first flow rate detection device 12 is provided in each pump unit 11 . The first flow rate detection device 12 is provided on the secondary side of the pump 21 and on the primary side of the check valve 23 . The first flow rate detection device 12 is a pump flow rate detection device that detects the flow rate on the secondary side of the pump 21 and on the primary side of the check valve 23 . For example, the first flow rate detection device 12 is provided on the secondary side of the confluence portion of the confluence pipe 17 . side, and may be provided on the primary side of the confluence portion 17 a of the confluence pipe 17 .

For example, the first flow rate detection device 12 may be a paddle type or float type that detects only the stop flow rate, or an impeller type that can detect the flow rate value. The first flow rate detection device 12 is connected to the control device 19 and outputs information on the detected flow rate as a signal.

The pressure detection device 13 is a pressure sensor. The pressure detection device 13 is provided in the joint pipe 17 . The pressure detection device 13 is connected to the control device 19 and outputs information on the detected pressure as a signal.

The pressure accumulator 14 is, for example, an accumulator. The pressure accumulator 14 can, for example, accumulate water at a pressure equal to or higher than the starting pressure. The volume of the pressure accumulator 14 is appropriately set depending on the usage conditions of the water supply device 1 and the like. Further, a plurality of pressure accumulators 14 may be installed depending on the usage conditions of the water supply device 1 and the like. For example, when the pump unit 11 is stopped, the pressure in the branch pipe 17d, in other words, when the pressure in the flow path from the pressure accumulator 14 to the water supply pipe 210 drops to near the starting pressure or to the starting pressure, the volume is reduced to expel water at or above the starting pressure.

The second flow detection device 15 is a flow sensor. The second flow rate detection device 15 is provided in part of the flow path from the pressure accumulator 14 to the water supply pipe 210 . The second flow rate detection device 15 is provided directly below the pressure accumulator 14, for example. In other words, the second flow rate detection device 15 is provided, for example, in the branch pipe 17d. The second flow detection device 15 detects at least the flow of water discharged from the pressure accumulator 14 and outputs the detected information to the control device 19 as a signal.

The second flow rate detection device 15 is, for example, an impeller type. Also, the second flow rate detection device 15 may be the same type of flow rate sensor as the first flow rate detection device 12 .

As shown in FIGS. 2 and 3, the control device 19 is, for example, a control panel. The control device 19 includes a drive device 31 and a control board (control section) 32 .

The driving device 31 drives the motor 22 at variable speeds. The driving device 31 is an inverter. For example, the drive devices 31 are provided in the same number as the pump units 11 .

As shown in FIG. 3 , the control board 32 includes, for example, an input device 41 , a notification section 42 , a communication section 43 , a storage section 44 and a control section 45 .

The input device 41 is an input device that can input information and instructions from the outside. The input device 41 is, for example, keys, buttons, or the like. The input device 41 transmits the input information to the control section 45 . The input device 41 also has switching means capable of switching between an automatic water supply mode in which automatic water supply control is performed to automatically control the pump unit 11 and a stop mode in which the pump unit 11 is not driven. Moreover, the switching means of the input device 41 may be formed so as to be capable of switching to a manual mode for manually driving the pump unit 11 in addition to switching between these modes.

The notification unit 42 is, for example, a display unit that displays information. Further, for example, when an abnormality occurs in the water supply device 1, the notification unit 42 notifies the abnormality to the outside based on the information transmitted from the control unit 45. FIG. The notification unit 42 includes, for example, a lamp that displays information by lighting or blinking, and a display that displays information.

The communication unit 43 is configured to be able to transmit and receive information to and from the outside. For example, the communication unit 43 outputs information to the outside wirelessly or by wire under the control of the control unit 45 . For example, the communication unit 43 is wired or wirelessly connected to a processing terminal such as a mobile terminal or a personal computer directly or via a network such as the Internet or a LAN (Local Area Network) to transmit and receive various information and commands. do.

The storage unit 44 includes so-called memory and storage. For example, when the automatic mode is selected by the input device 41, the storage unit 44 stores a control program and various parameters for the pump unit 11 in automatic water supply control. The storage unit 44 stores a starting pressure, which is a pressure value on the secondary side of the pump unit 11 at which the pump unit 11 starts to be driven, and a target pressure on the secondary side of the pump unit 11 .

Here, the automatic water supply control means that when the automatic water supply mode is set and the pressure detected by the pressure detection device 13 is the starting pressure, the pump unit 11 is driven, and after the starting operation, the target pressure and Control the drive device 31 to control the speed of the motor 22 so that the pump unit 11 is stopped when the flow rate detected by the first flow rate detection device 12 is a predetermined flow rate (stop flow rate). is.

In other words, the automatic water supply control is a mode in which the control section 45 controls the pump unit 11 under constant target pressure control. The constant target pressure control includes constant discharge pressure control with the discharge pressure on the secondary side of the pump unit 11 as the target pressure, constant estimated terminal pressure control in consideration of the flow path resistance (piping resistance), and the like. be

The storage unit 44 also stores a control program and various parameters for starting the pump 21 in the normal starting operation and the protective starting operation as the starting operation for starting the pump 21 in the automatic water supply control.

Here, the starting operation is, for example, the control operation of the pump 21 from the start of the pump 21 until the pressure detected by the pressure detection device 13 reaches the starting target pressure. Further, the starting target pressure includes the normal starting target pressure used in the normal starting operation and the protection starting target pressure used in the protection starting operation. For example, the normal startup target pressure and the protection startup target pressure are stored in advance in the storage unit 44 . Here, the start-time target pressure is the target pressure used in the above-described target pressure constant control, but may be a target pressure set separately from the above-described target pressure and used only during the start-up operation.

The normal starting operation includes, for example, the time from when the starting pressure stored in advance in the storage unit is determined and the start of the pump 21 is started until the pressure reaches the target pressure at normal starting, the speed increase (acceleration) of the rotation speed, etc. This is a control operation of the pump 21 in which the pump 21 is controlled based on.

The protection starting operation includes, for example, the time from when the starting pressure stored in advance in the storage unit is determined and the start of the pump 21 is started until the pressure reaches the target pressure at the time of protection starting, the speed increase (acceleration) of the rotation speed, etc. This is a control operation of the pump 21 in which the pump 21 is controlled based on. The protective starting operation is a control operation of the pump 21 in which the pump 21 is controlled so that the pressure detected by the pressure detection device 13 increases more slowly than in the normal starting operation. In other words, the protective start-up operation is a pressurization avoidance operation that prevents a rapid (excessive) pressure rise in the flow path by suppressing the pressure rise more than the normal start-up operation.

As examples of various parameters for the normal startup operation and the protective startup operation, for example, the storage unit 44 stores the normal startup pressure reaching time T0, which is the time required for the normal startup target pressure to be reached in the normal startup operation, and the protective A protective starting pressure reaching time T2 is stored, which is the time required for reaching the target pressure at protective starting in the starting operation. Furthermore, the normal starting pressure reaching time T0 and the protective starting pressure reaching time T2 are times until the pressure detected by the pressure detection device 13 reaches the starting target pressure. The driving device 31 is controlled to control the acceleration time of the motor 22 so that the starting target pressure is reached in time.

Here, the normal starting pressure reaching time T0 is, for example, the time the pump 21 is driven and the pressure detected by the pressure detecting device 13 reaches the starting target pressure. The time is set to a time at which water hammer does not occur when the channel is filled with water, and water hammer may occur when there is no water in the channel on the secondary side of the pump unit 11 .

In addition, the protection starting pressure reaching time T2 is, for example, the time the pump 21 is driven and the pressure detected by the pressure detection device 13 reaches the protection starting target pressure. Even if there is no water in the road, the time is set so that water hammer does not occur. Also, the protection starting pressure reaching time T2 is set to a time longer than the normal starting pressure reaching time T0.

The storage unit 44 stores the preset normal starting pressure reaching time T0 and protection starting pressure reaching time T2.

The storage unit 44 also stores whether or not the secondary side of the pump unit 11 is filled with water in the automatic water supply control, that is, the secondary side of the pump unit 11 including the water supply pipes 210 such as the vertical pipe 211 and the horizontal pipe 212. A threshold value for determining whether or not the pump unit 11 is started in a state in which air may exist in the side pipe is stored. Here, the threshold is the same voltage value as the signal voltage output when the flow of water is detected from the second flow rate detection device 15 . The storage unit 44 also stores an arbitrarily set set time T1 for determining whether or not the secondary side of the pump unit 11 is filled with water.

The set time T1 is arbitrarily set in advance depending on the flow path on the secondary side of the pump unit 11, the water supply pipe 210, the performance of the pump unit 11, and the like. As a specific example, during the set time T1, water is used in the water supply pipe 210 while the pump 21 is stopped, and the pressure in the flow path (pipe line) decreases. This is the time from when the water is discharged to when the pump 21 is started, and there is no possibility that air will exist in the flow path (pipe line) before the pump 21 is started.

The control unit 45 is, for example, a processor. The control unit 45 controls the driving device 31 as automatic water supply control according to the program stored in the storage unit 44, and starts the pump unit 11 when the pressure detected by the pressure detection device 13 is the starting pressure. Then, when the flow rate detected by the first flow rate detection device 12 is the stop flow rate, the pump unit 11 is stopped. Further, in the automatic water supply control, the control unit 45 performs constant target pressure control so that the target pressure stored in the storage unit 44 becomes the pressure detected by the pressure detection device 13 after the pump unit 11 is started. .

As a specific example, when the automatic water supply mode is selected by the input device 41, the control unit 45 monitors the pressure based on the signal output from the pressure detection device 13 to perform automatic water supply control, and detects the pressure. When the pressure detected by the device 13 is equal to or lower than the starting pressure, it is determined that the conditions for starting the pump 21 are satisfied, and the pump unit 11 is started.

Further, the control unit 45 determines whether the pump unit 11 is to be started by normal starting operation or protection starting operation, and starts the pump unit 11 by the determined starting operation.

For example, when the pressure detected by the pressure detection device 13 becomes the starting pressure, the control unit 45 determines whether water is discharged from the pressure accumulator 14 and the flow rate is detected by the second flow rate detection device 15. judge. As a specific example, when the pressure detected by the pressure detection device 13 becomes the starting pressure, the control unit 45 controls the set time period during which the pressure detected by the pressure detection device 13 is stored in the storage unit 44 from the time of the starting pressure. It is determined whether or not a signal is output from the second flow rate detection device 15 before T1 elapses.

When the signal is output from the second flow rate detection device 15 within the set time T1 after the pressure detected by the pressure detection device 13 reaches the starting pressure, the control unit 45 causes the flow path to Determine that water is full. That is, the control unit 45 determines that the normal starting operation is to be started, and starts the pump unit 11 by the normal starting operation.

If no signal is output from the second flow rate detection device 15 within the set time T1 after the pressure detected by the pressure detection device 13 reaches the starting pressure, the control unit 45 It is determined that there is a possibility that air may exist. That is, the control unit 45 determines to start the pump unit 11 by the protection start operation, and starts the pump unit 11 by the protection start operation.

Further, when the pressure detected by the pressure detection device 13 reaches the starting target pressure by the normal start operation or the protection start operation, the control unit 45 controls the flow rate until the flow rate detected by the first flow rate detection device 12 reaches the stop flow rate. , the pump unit 11 is controlled by constant target pressure control. Here, for example, when the starting target pressure is a part of the target pressure used in the constant target pressure control, after the control unit 45 starts the pump unit 11 by the control starting operation or the protection starting operation, the stop flow rate and The pump unit 11 is controlled by the target pressure constant control until it becomes.

Next, the water supply method by the water supply apparatus 1 configured in this manner will be described using the flow chart shown in FIG.

First, the input device 41 is operated by an operator or the like, the automatic water supply mode is selected, power is supplied, and the pump 21 is stopped, that is, while the pump 21 is stopped (step ST1). monitors whether or not a signal is output from the second flow rate detection device 15 (step ST2). For example, when a signal is output from the second flow rate detection device 15 , the control section 45 stores information on the output signal of the second flow rate detection device 15 and information on the time at which the signal was received in the storage section 44 . For example, the control unit 45 stores the date and time when the output signal is received, or Alternatively, the elapsed time after receiving the signal from the second flow rate detection device 15 is counted.

Also, the control unit 45 monitors the output signal from the pressure detection device 13 (step ST2). Then, when the pressure detected by the pressure detection device 13 becomes equal to or lower than the starting pressure, the control section 45 determines that the conditions for starting the pump 21 are satisfied (step ST3).

When the pressure detected by the pressure detection device 13 becomes equal to or lower than the starting pressure and the starting condition is satisfied, the control section 45 determines whether to perform the normal starting operation or the protective starting operation (step ST4). As a specific example, the control unit 45 causes the second flow rate detection device 15 to discharge water from the pressure accumulator 14 ( flow rate) is detected.

If a signal is output from the second flow rate detection device 15 within the set time T1 before the starting condition is satisfied (YES in step ST4), the water discharged from the pressure accumulator 14 causes the flow path toward the water supply pipe 210. The control unit 45 controls the driving device 31 to start by normal starting operation (step ST5). Then, the control unit 45 performs target pressure constant operation control so that the pressure detected by the pressure detection device 13 becomes the target pressure at normal startup (step ST6). In the present embodiment, since the target pressure at normal start-up is part of the target pressure at a constant target pressure, the normal start-up operation is part of the constant target pressure control. After starting the pump unit 11, the pump unit 11 is operated under constant target pressure control.

If a signal is not output from the second flow rate detection device 15 within the set time T1 before the starting condition is established in step ST4 (NO in step ST4), there is a possibility that air may exist in the flow path leading to the water supply pipe 210. Assuming that there is, the drive device 31 is controlled to perform a start (boost avoidance start) by a protection start operation (step ST7). Then, as the protection starting operation, when the pressure detected by the pressure detection device 13 reaches the protection starting target pressure, or when the protection starting pressure reaching time T2 elapses from the start of the starting operation of the pump 21, the control unit 45 The driving device 31 is controlled to drive the pump 21 under the constant target pressure control (step ST6).

As described above, after each starting operation is performed by the water supply device 1, water is supplied by the target pressure constant control.

Next, examples of the normal starting operation and the protection starting operation will be described with reference to FIGS. 5 to 7. FIG. FIG. 5 shows the frequency of the motor 22 and the pressure fluctuation in the normal starting operation when the starting condition is satisfied and the signal is output from the second flow rate detection device 15 during the set time T1 before the starting condition is satisfied. shows an example of FIG. 6 is an example of the start-up operation when air exists on the secondary side of the pump unit as in the conventional water supply system. In other words, FIG. 6 shows a case where the starting condition is satisfied using the water supply device 1 of the present embodiment and the signal is not output from the second flow rate detecting device during the set time T1 before the starting condition is satisfied ( 1 shows an example of the frequency of the motor 22 and the pressure fluctuation when the normal starting operation is performed (when air exists on the secondary side of the pump unit 11). FIG. 7 shows an example of motor 22 frequency and pressure variation during a protected start operation. 5 to 7, a multi-story building is assumed as the water supply pipe 210, and the detected pressure A on the 1st floor of the building and the detected pressure B on the higher floor than the 1st floor were measured.

When a signal is output from the second flow rate detection device 15 during the set time T1 before the starting condition is satisfied, as shown in FIG. , with the increase in the frequency of the motor 22, it gradually increased to the target pressure at normal start-up. Also, no water hammer occurred.

On the other hand, when the starting condition is satisfied and no signal is output from the second flow rate detecting device 15 during the set time T1 before the starting condition is satisfied, normal starting operation is performed as shown in FIG. As the frequency of the motor 22 increased, the pressure gradually increased, but water hammer occurred in which the pressure detected on the 1F and upper floors increased sharply. This is the case when the water in the pressure accumulator 14 has already been discharged and the water is discharged from the water tap 220 of the water supply pipe 210 at the stage when the starting condition is satisfied. If there is air in the flow path on the secondary side, it is considered that the air in the flow path is rapidly compressed by driving the pump 21 .

However, as shown in FIG. 7, in a state where water is not filled in the flow path (inside the pipe) on the secondary side of the pump unit 11, that is, in a state where water hammer occurs as in the example of FIG. As a protective starting operation, when the pump 21 was started with an extended acceleration time, the pressure detected at 1F and the upper floors rose smoothly as the frequency of the motor 22 increased, and water hammer did not occur. From this, it is clear that the situation in which water hammer occurs can be determined by using the present embodiment. Further, as a condition for occurrence of water hammer, the occurrence of water hammer is prevented by performing a protection start operation when a signal is not output from the second flow rate detection device during the set time T1 before the start condition is established. It is clear that

According to the water supply device 1 configured in this manner, when the control unit 45 detects the flow of water discharged from the pressure accumulator 14 by the second flow rate detection device 15 when the starting condition for the pump 21 is satisfied, starts the pump 21 by the normal starting operation, and starts the pump 21 by the protection starting operation, which is a boost avoidance operation for avoiding a sudden increase in pressure, when the second flow rate detection device 15 does not detect the flow of water.

As a result, it is possible to determine whether or not there is water in the flow path (pipe line) from the pump unit 11 to the water supply pipe 210, rather than the initial operation of the pump 21, so that unnecessary protection starting operation can be performed. start can be suppressed. In addition, when air exists in the flow path and there is a risk of water hammer, the pump 21 can be started by the protective starting operation. Therefore, the water supply device 1 can prevent a rapid pressure rise in the flow path due to air compression, and can prevent water hammer from occurring.

As described above, according to the water supply device 1 according to the embodiment of the present invention, it is possible to suppress deterioration of followability and prevent occurrence of water hammer.

In addition, this invention is not limited to embodiment mentioned above. For example, in the above example, the controller 45 drives and controls the pump 21 with the protection starting pressure reaching time T2, which is longer than the normal starting pressure reaching time in the normal starting operation, as the protective starting operation. is not limited to

For example, the control unit 45 may be configured to repeat driving and stopping of the pump unit 11 as the protection starting operation. When the water supply device 1 performs such a protection start operation, the storage unit 44 stores a protection drive time for the pump unit 11 in the protection start operation, a protection stop time for stopping the pump 21 after the protection drive time has elapsed, and The number of cycles is stored, which is the number of cycles of driving and stopping the pump unit 11 during the protection drive time and the protection stop time. Here, the protection driving time is, for example, the time during which water hammer does not occur and the pressure in the piping on the secondary side of the pump unit 11 does not reach the starting target pressure. It is appropriately set according to the volume of the piping on the secondary side of the pump unit 11 and the like.

The number of cycles is set to multiple times. As shown in FIG. 8, when the number of cycles is plural, the protection drive time T1 for each water supply is set to, for example, the same time, and similarly, the protection stop time T2 for each water supply is set to, for example, the same time. set. Note that the plurality of protection drive times T1 may be set to different times, and similarly, the plurality of protection stop times T2 may be set to different times. Also, the protection drive time T1 and the protection stop time T2 may be set to the same time or may be set to different times.

For example, with reference to FIG. 8, an example of a time chart of the protection starting operation and the constant target pressure control automatic water supply mode will be described. Note that FIG. 8 shows an example in which a plurality of protection drive times T1 are set to the same time, protection stop times T2 are set to the same time, and the number of cycles is set to n=4.

As shown in FIG. 8, in the protection starting operation, after driving the pump unit 11 for the protection drive time T1, the pump unit 11 is stopped for the protection stop time T2. Water is supplied (protective starting operation) to fill the pipe with water.

In this example, the number of cycles n is 4, after which the pump unit 11 is driven under constant target pressure control. That is, the control unit 45 drives the pump unit 11 for the predetermined time T0 by the protection starting operation, and then drives the pump unit 11 by the constant target pressure control. Note that the time T0 for controlling the driving of the pump unit 11 in the protection starting operation is obtained from T0=(T1+T2)×n.

In this way, the protective starting operation repeats a plurality of water supply cycles consisting of driving and stopping the pump unit 11, thereby preventing a rapid pressure rise due to air compression and preventing the water from being compressed. It is possible to prevent the occurrence of hammers. That is, since the protective starting operation repeats the driving and stopping of the pump unit 11, the intermittent operation of the pump unit 11 is performed, and the occurrence of water hammer can be prevented.

In addition, since such a protection starting operation is configured such that the pump unit 11 is stopped after being driven for the protection driving time, and is stopped for the protection stopping time, the driving of the pump unit 11 itself is the target pressure constant control and the identification degree. Since the frequency of the pump 21 can be increased by increasing the speed of , deterioration in the followability of the pump unit 11 can be suppressed.

That is, the protection starting operation for driving and stopping the pump unit 11 for the number of cycles is a configuration in which only the driving and stopping times of the pump unit 11 are changed with respect to the constant target pressure control. There is no change in the value commanded to the driving device 31 that performs variable speed driving, and the load related to control may be small.

Note that the protection starting operation may be another protection starting operation. For example, the storage unit 44 stores a plurality of step pressures that are set in stages from the start of the pump 21 until the target pressure at start is reached, and a plurality of holding times that are set for each of the step pressures. It may be configured such that when the control unit 45 performs the protection start-up operation, the pressure is increased step by step and the step of maintaining the pressure for the retention time is repeatedly performed. In addition, even when performing such a protection start operation, the control unit 45 performs the target pressure constant control after all the steps are executed to determine whether the pressure detected by the pressure detection device 13 reaches the start target pressure. . The water supply device 1 that performs such a protection start-up operation has the same effect as the other protection start-up operation described above.

In the above example, the second flow rate detection device 15 is connected to the branch portion 17b on the secondary side of the pump unit 11, and is provided in the branch pipe 17d in which the pressure accumulator 14 is provided. However, the configuration is not limited to this. . For example, as in another embodiment shown in FIG. 9, the second flow rate detection device 15 is connected to the branch portion 17b of the junction pipe 17 on the secondary side of the pump unit 11, and is connected to the water supply pipe 210. It is good also as a structure provided in the piping 17c.

10, for example, the water supply device 1 does not have the second flow rate detection device 15, and uses the flow rate detection device 15 provided in the water supply pipe 210 as the second flow rate detection device. It may be a configuration.

Also, in the above example, an example in which the control device 19 is a control panel has been described, but the present invention is not limited to this. For example, the control device 19 may be an inverter box. If the control device 19 is an inverter box, it may be configured without the input device 41, the notification unit 42, etc., among the configurations described above.

That is, the present invention is not limited to the above-described embodiments, and can be variously modified in the implementation stage without departing from the scope of the invention. Further, each embodiment may be implemented in combination as appropriate, in which case the combined effect can be obtained. Furthermore, various inventions are included in the above embodiments, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiments, if the problem can be solved and effects can be obtained, the configuration with the constituent elements deleted can be extracted as an invention.

DESCRIPTION OF SYMBOLS 1... Water supply apparatus, 11... Pump unit, 12... 1st flow rate detection apparatus (flow rate detection apparatus for pumps), 13... Pressure detection apparatus, 14... Pressure accumulator, 15... 2nd flow rate detection apparatus (flow rate detection apparatus), 16 Branch pipe 17 Merging pipe 17a Merging portion 17b Branching portion 17c Piping 17d Branching pipe 19 Control device 21 Pump 22 Motor 23 Check valve 31 Drive Apparatus 32 Control board (control unit) 41 Input device 42 Notification unit 43 Communication unit 44 Storage unit 45 Control unit 100 Water source 110 Main pipe 120 Measured water Container, 200... Building, 210... Water supply pipe, 211... Vertical pipe, 212... Horizontal pipe, 220... Water tap.

Claims (11)

a pump;
a motor that drives the pump;
a driving device that drives the motor at variable speed;
a check valve provided on the secondary side of the pump;
a pressure accumulator provided on the secondary side of the check valve;
When the flow rate detecting device for detecting the flow of water discharged from the pressure accumulator detects the flow of water discharged from the pressure accumulator when the starting condition of the pump is satisfied, controlling the driving device, When the pump is started by normal starting operation and the pump starting condition is satisfied, and the flow rate detection device does not detect the flow of water discharged from the pressure accumulator, the driving device is controlled to a control unit that starts the pump with a protective starting operation that is a gentler starting operation than the normal starting operation;
water supply device. further comprising a pressure detection device disposed between the check valve and the pressure accumulator;
The water supply device according to claim 1, wherein the control unit determines that a condition for starting the pump is satisfied when the pressure detected by the pressure detection device is equal to or lower than a starting pressure for starting the pump. further comprising a pump flow rate detection device disposed between the pump and the check valve;
2. The water supply device according to claim 1, wherein said control unit determines that a condition for starting said pump is satisfied when said pump flow rate detection device detects a flow rate. a pipe connecting the secondary side of the pump and a water supply destination;
a branching portion provided in the pipe;
a branch pipe provided at the branch portion;
The water supply device according to any one of claims 1 to 3, wherein the pressure accumulator is connected to the branch pipe. The water supply device includes the flow rate detection device,
The water supply device according to claim 4, wherein the flow rate detection device is provided in the branch pipe. The water supply device includes the flow rate detection device,
The water supply device according to claim 4, wherein the flow rate detection device is provided in the pipe on the water supply destination side of the branch portion. A storage unit that stores a protection starting pressure reaching time from the start of the pump to reaching the starting target pressure in the protection starting operation,
The protection starting pressure reaching time is set longer than the time from starting the pump to reaching the starting target pressure in the normal starting operation,
In the protection starting operation, the control unit controls the drive device so that the pressure detected by the pressure detection device becomes the starting target pressure over the protection start pressure reaching time, and the pressure detection device The water supply device according to claim 2 or 3, wherein the target pressure constant control is performed after the pressure detected in reaches the starting target pressure. a storage unit that stores the drive time and stop time of the pump and the number of cycles of drive and stop of the pump from the start of the pump until the target pressure at start is reached in the protection start operation,
In the protection starting operation, the control unit controls the driving device to repeat driving and stopping of the pump based on the driving time and the stopping time for the number of cycles, and is detected by a pressure detecting device. The water supply device according to claim 2 or 3, wherein the constant target pressure control is performed after the pressure reaches the starting target pressure. A plurality of step pressures that are set in stages from the start of the pump until the target pressure at start is reached in the protection start operation, and a plurality of holding times for maintaining the pressure that is set for each of the step pressures are stored. a storage unit for
In the protection starting operation, the control unit controls the driving device so that the pressure detected by the pressure detection device is set to the plurality of step pressures, and the pressure is held for the holding time for each of the step pressures. 4. The water supplying apparatus according to claim 2, wherein the constant target pressure control is performed after the pressure detected by the pressure detecting device reaches the starting target pressure. The storage unit stores a set time that is a predetermined time,
The control unit determines whether or not the flow rate detecting device detects a flow of water during the set time before the start condition for the pump is satisfied when the condition for starting the pump is satisfied, and 10. A water supply system as claimed in any one of claims 7 to 9, wherein the pump is started in a normal starting operation or in the protected starting operation. a driving device that drives a motor that drives the pump at variable speed;
The pressure accumulator is a flow rate detection device that detects the flow of water discharged from a pressure accumulator provided on the secondary side of a check valve provided on the secondary side of the pump when the starting condition of the pump is satisfied. When the flow of water discharged from the pressure accumulator is detected, the drive device is controlled to start the pump by normal starting operation, and when the start condition of the pump is satisfied, the flow rate detection device detects the flow of water from the pressure accumulator. a control unit that controls the driving device to start the pump in a protective starting operation, which is a gentler starting operation than the normal starting operation, when the discharged water flow is not detected;
A control panel with

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