JP6650491B2 - Water supply device - Google Patents

Description

  The present invention relates to a water supply device having a plurality of pump devices.

  BACKGROUND ART Conventionally, as a water supply device used for a building or the like, a device having a plurality of pump devices has been known. Further, the water supply device has check valves on the secondary side of the pump, respectively, to prevent water from flowing back from the discharge side to the suction side of the pump.

  This water supply device, for example, when the pressure on the secondary side of the pump detected by the pressure detection unit during the stop becomes equal to or less than the starting pressure, starts one pump device to perform an independent operation, and When the flow rate detecting unit detects a decrease in the pressure, the driving pump device is stopped.

  In such a water supply device, when the sealing performance of the check valve is deteriorated due to long-term use, there is a possibility that the check valve may leak. When the check valve leaks, the water in the accumulator flows back when all the pump devices are stopped, and when any one of the pump devices is driven, the pump of the driven pump device is turned off. The discharged water will flow back.

  For this reason, there is also known a water supply device in which an impeller type flow detecting unit is provided between the pump and the check valve, and the reverse flow is detected by the flow detecting unit and a failure of the check valve is detected (for example, Patent Document 1).

JP-A-2006-19708

  However, in the water supply device described above, even if the failure of the check valve can be detected and the information can be notified to the outside, the process when the check valve fails while the pump device is operating cannot be performed. In such a case, if the pump device is stopped, there is a possibility that the water supply amount may decrease. On the other hand, when the pump device is stopped, there is a problem that water is cut off.

  Therefore, an object of the present invention is to provide a water supply device capable of supplying water appropriately even when one of a plurality of check valves fails.

As one aspect of the present invention, the water supply device includes a pump and a plurality of pump devices including a motor that drives the pump, a plurality of discharge pipes respectively provided in the pump, and a merging pipe that merges the plurality of discharge pipes. An impeller that is provided on a primary side or a secondary side of the pump and rotates by receiving a water flow, and a flow rate detection unit including a detection unit that detects rotation of the impeller; and the junction pipe or the junction. A pressure detector provided on the secondary side of the pipe, a plurality of check valves disposed on the secondary side of the pump, and the discharge pipe on the primary side of the confluence pipe, and the motor, The pump is driven by drive control, and when any one of the plurality of motors is driven, the pressure detected by the pressure detection unit is reduced to less than a target pressure, and provided to the driven pump. the flow rate When it is detected by the detecting portion flow rate is equal to or less than a predetermined percentage of rated flow, and a control unit which determines that the check valve provided in the pump is stopped is faulty.

  According to the present invention, it is possible to provide a water supply device capable of supplying water even when one of the plurality of check valves fails.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows a part of structure of the water supply apparatus which concerns on one Embodiment of this invention with omission and a cross section. The side view which shows a part of structure of the same water supply apparatus by omission and a cross section. The block diagram which shows the structure of the same water supply apparatus. The front view which shows the structure of the check valve used for the same water supply apparatus. Sectional drawing which shows the structure of a flow detection part. The flowchart which shows an example of control of the same water supply apparatus. FIG. 4 is a front view showing a configuration of the water supply device using a check valve different from that of FIG. The front view which shows a part of structure of the water supply apparatus which concerns on other embodiment of this invention with omission and a cross section.

Hereinafter, a water supply device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a front view showing a part of the configuration of a water supply device 1 according to an embodiment of the present invention, partially omitted and in section. FIG. 2 is a side view showing a part of the configuration of the water supply apparatus 1 in a partially omitted and cross-sectional view. FIG. 3 is a block diagram illustrating a configuration of the water supply device 1. FIG. 4 is a front view showing the configuration of the check valve 16 used in the water supply device. FIG. 5 is a cross-sectional view illustrating a configuration of the flow rate detection unit 20 used in the water supply device 1.

  As shown in FIG. 1, the water supply device 1 is provided on a suction pipe 11, a branch pipe 13 provided on a secondary side of the suction pipe 11 and branching a flow path into a plurality of channels, and provided on a secondary side of the branch pipe 13. The plurality of pump devices 14 provided, the plurality of discharge tubes 15 provided in each of the plurality of pump devices 14, the plurality of check valves 16 provided in each of the discharge tubes 15, and the plurality of discharge tubes 15 are merged. A merging pipe 17, a pressure accumulator 18 provided in the merging pipe 17, a first pressure detecting section 19 provided in the suction pipe 11, a flow detecting section 20 provided in the discharge pipe 15, and a merging pipe 17. A second pressure detection unit 21 and a control panel 22 are provided.

  Further, the water supply device 1 includes a base 24, a support plate 25 provided on the base 24, and a cover 26 that covers the support plate 25. The water supply device 1 is configured such that the above-described respective constituent members are fixed on the base 24 and the front surface of the support plate 25, and the cover 26 covers the base 24, the front side of the support plate 25, and the respective constituent members.

  The suction pipe 11 is connected to a water supply pipe on the primary side of the water supply device 1, a water receiving tank, and the like.

  The branch pipe 13 is connected to the suction pipe 11 and forms a flow path on the secondary side of the suction pipe 11, and branches the flow path into a plurality of, in this embodiment, two.

  The pump device 14 includes a motor 14a and a pump 14b. The pump device 14 is, for example, a vertical pump having a rotating shaft extending along the direction of gravity.

  The motor 14a is connected to the pump 14b via a rotating shaft. The motor 14a is electrically connected to the control panel 22. The pump 14b is driven by a motor 14a. The pump 14b is a single-stage or multi-stage pump. The pump 14 b has a primary side connected to the branch pipe 13, and a secondary side connected to the discharge pipe 15. For example, in the pump 14b, a suction port is formed at a lower end, and a discharge port is formed on a side surface on an upper end side of the pump 14b.

  The discharge pipe 15 is connected to the discharge port of the pump 14b, is bent downward at a position adjacent to the discharge port of the pump 14b, and extends along the direction of gravity. The discharge pipe 15 is configured by, for example, combining a plurality of pipes.

  The check valve 16 is provided on the secondary side of the pump 14 b and on the primary side of the merge pipe 17, that is, in the discharge pipe 15. As a specific example, the check valve 16 is provided at a position of the discharge pipe 15 adjacent to the discharge port of the pump 14b. For example, the check valve 16 is a swing-type check valve, and includes a valve body 31 and a seat 32.

  The valve element 31 includes a base portion 31a fixed to the discharge pipe 15, a valve portion 31b integrated with a part of the base portion 31a, and a rectifying fin 31c provided on the valve portion 31b. The valve element 31 is integrally formed of a rubber material.

  The base 31a is, for example, a flange packing that is arranged between a plurality of pipes of the discharge pipe 15 and seals between the pipes. In other words, the base 31a is disposed between the discharge pipe 15 and the flange, and the discharge pipe 15 and the flange are fastened to make the space between the discharge pipe 15 and the flange watertight. The base 31a is formed in substantially the same shape as the flange surface of the pipe. For example, the base 31a is formed in an annular flat plate shape.

  The valve portion 31b is integrally formed with the inner peripheral surface of the base portion 31a via a neck portion 31d. The rectifying fins 31c are provided on the main surface on the secondary side in the flow direction of the water of the valve portion 31b.

  The seat 32 closes the flow path in the discharge pipe 15 by abutting on the valve 31b. For example, the seat 32 is provided on a discharge flange provided on the discharge side of each pump 14b. As a specific example, the seat 32 is a cylindrical projection provided on the outer peripheral edge of the discharge port of the discharge flange of each pump 14b.

  The joining pipe 17 joins the discharge pipes 15 connected to the respective pumps 14b. The junction pipe 17 is connected to a pipe connected to a water supply destination such as a faucet of a building or a shower head. The accumulator 18 is an accumulator provided in the merging pipe 17.

  The first pressure detector 19 is provided on the primary side of the branch pipe 13 of the suction pipe 11. The first pressure detector 19 detects the pressure on the primary side of the plurality of pump devices 14. The first pressure detector 19 is electrically connected to the control panel 22 via a signal line, converts the detected pressure into a signal, and transmits the signal to the control panel 22.

  The flow detection unit 20 includes an impeller 41 and a detection unit 42 that detects rotation of the impeller 41. The impeller 41 is provided on the discharge pipe 15 so as to be rotatable by the flow of water flowing in the discharge pipe 15. The flow detector 20 is provided on the primary side or the secondary side of the pump 14b. For example, the impeller 41 includes a rotating shaft and a plurality of blades, and is provided in the discharge pipe 15 and on the secondary side of the check valve 16.

  The detection unit 42 includes, for example, a magnet provided on the rotation shaft of the impeller 41 and a sensor that detects the rotation of the magnet. The detection unit 42 is connected to the control panel 22 via a signal line.

  The second pressure detector 21 is provided in the junction pipe 17 and is configured to be able to detect the pressure on the secondary side of the plurality of pump devices 14. The second pressure detector 21 is electrically connected to the control panel 22 via a signal line or the like, converts the detected pressure into a signal, and transmits the signal to the control panel 22.

  The control panel 22 includes a display unit 50, an inverter 51, a storage unit 52, and a control unit 53. The control panel 22 has a case 55 fixed to the support plate 25 for accommodating electrical components constituting the inverter 51, the storage unit 52, and the control unit 53. Further, the control panel 22 may include a notification unit that notifies information to the outside by sound.

  The display unit 50 is a display, an LED, or the like that can display the driving status of the pump device 14, the presence or absence of an abnormality in the water supply device 1, and the like. The display unit 50 is electrically connected to the control unit 53 via a signal line. For example, the display unit 50 is a notification unit that notifies the failure of the check valve 16 to the outside. In the case where the control panel 22 has a notifying unit, for example, the notifying unit is a notifying unit for notifying the failure of the check valve 16 to the outside by sound.

  Inverter 51 is electrically connected to motor 14a and control unit 53 via a signal line. In the present embodiment, the inverter 51 is provided with the same number of motors 14a, for example, two. The inverter 51 changes the rotation speed of the motor 14a.

  The storage unit 52 stores a starting pressure for starting the pump device 14, a target pressure and a rated flow rate at the time of water supply, and a stop flow rate for stopping the water supply. Further, the storage unit 52 stores a control program for controlling the inverter 51 by the control unit 53 during the water supply operation, a failure detection program for detecting the failure of the check valve 16, and a water supply operation when the failure of the check valve 16 is detected. Various programs such as a failure control program for controlling the inverter 51 are stored.

  The control unit 53 controls the inverter 51 based on the pressure and the flow rate detected by the first pressure detection unit 19, the flow rate detection unit 20, and the second pressure detection unit 21 so that the discharge pressure is constant or the estimated terminal pressure is constant. Next, the pump device 14 is controlled.

  As a specific example, the control unit 53 has the following functions (1) to (3). The functions of the control unit 53 occur based on the driving status of the pump device 14 and the thresholds and programs stored in the storage unit 52.

  (1) Function to perform water supply operation.

  (2) A function for detecting a failure of the check valve 16.

  (3) A function for performing water supply operation when the check valve 16 fails.

  Next, the functions (1) to (3) of the control unit 53 will be described.

  The function (1) is a function of driving and stopping the pump device 14 to the secondary water supply destination of the water supply device 1 based on the pressure and the flow rate of the secondary device of the pump device 14 to supply water. As a specific example, the function of (1) is that the control unit 53 drives one of the pump devices 14 when the pressure detected by the second pressure detecting unit 21 becomes equal to or lower than the starting pressure, and drives the pump device 14. When the flow rate detected by the flow rate detector 20 on the secondary side of the pump device 14 that is being driven later becomes equal to or less than the stop flow rate, the function is to stop the driven pump device 14. Further, as the function of (1), for example, the control unit 53 performs the water supply operation by a so-called alternate operation in which the pump device 14 to be driven and stopped is alternately switched.

  In the function (2), the failure of the check valve 16 is determined based on at least one of the pressure and the flow rate on the secondary side of the pump device 14 when the water supply operation is performed based on the function (1). Function.

  As a specific example, the function of (2) is a case where the control unit 53 performs the water supply operation when the pressure detected by the second pressure detection unit 21 falls below the target pressure, and the pump being driven If the flow rate detected by the flow rate detection unit 20 on the secondary side of the device 14 is lower than the rated flow rate, it is determined that the check valve 16 provided on the secondary side of the pump device 14 that is stopped is out of order.

  Here, as a value that the flow rate detected by the flow rate detection unit 20 on the secondary side of the pump device 14 being driven is lower than the rated flow rate, for example, a value obtained by multiplying the rated flow rate by a constant rate may be mentioned. One example is 80%. Note that a value obtained by multiplying the rated flow rate determined to be the failure of the check valve 16 by the fixed ratio can be appropriately set according to the configuration of the water supply device 1 and may be obtained by actual measurement in advance.

  In addition, although 80% has been described as an example of the fixed ratio, the present invention is not limited to this. However, in a certain water supply device 1, the check valve 16 is in a state where the check valve 16 is in failure and the pump device 14 is normal. Is driven, and the flow rate detected by the flow rate detecting section 20 when the pressure detected by the second pressure detecting section 21 is lower than the target pressure is reduced to 75% of the rated flow rate.

  That is, during the water supply operation, when the water supply demand at the water supply destination increases and the pressure detected by the second pressure detection unit 21 falls below the target pressure, the secondary side of the driven pump device 14 Where the flow rate detected by the flow rate detection unit 20 is substantially equal to the rated flow rate, if the flow rate is lower than the rated flow rate beyond the range of the error, it is determined that the gas flows back to the stopped pump device 14. Can be estimated. For this reason, when the pressure on the secondary side of the pump device 14 being driven during the water supply operation is lower than the target pressure and the flow rate is lower than the rated flow, the control unit 53 is provided for the stopped pump device 14. It is determined that the checked check valve 16 is out of order.

  The function of (3) is such that when the control unit 53 determines that the check valve 16 on the secondary side of any of the pump devices 14 has failed in the function of (2), the check valve 16 has failed to the outside. It is a function to report the information that is being supplied and to continue the water supply operation.

  As a specific example, when the control unit 53 determines that the secondary check valve 16 of any one of the pump devices 14 has failed by the function of (2), the control unit 53 outputs the function from the display unit 50 to the external unit. To notify the failure of the check valve 16. In the case where the control panel 22 has a notification unit, the failure of the check valve 16 is notified from the notification unit to the outside by sound. Further, the control unit 53 maintains the normal water supply operation by the pump device 14 provided with the normal check valve 16 and, when the flow rate detected by the flow detection unit 20 becomes equal to or less than the stop flow rate, the pump device 14 And when the pressure detected by the second pressure detection unit 21 drops below the starting pressure from the next time, the pump device 14 provided with the normal check valve 16 is not driven, and a failure occurs. The pump device 14 provided with the check valve 16 is driven.

  As described above, the function (3) is a function of, when the control unit 53 detects a failure of the check valve 16, driving the pump device 14 which has determined that the check valve 16 has failed after the next time.

  Next, an example of control of the water supply device 1 configured as described above will be described with reference to a flowchart shown in FIG.

  First, when the pressure detected by the second pressure detecting unit 21 is equal to or lower than the starting pressure, the control unit 53 starts one of the pump devices 14 (step ST1). At this time, when performing the alternate operation, the control unit 53 drives a pump device 14 different from the pump device 14 that was driven last time.

  Next, the control unit 53 detects the pressure by the second pressure detection unit 21 during the operation of the pump device 14 (step ST2), and determines whether the detected pressure is lower than the target pressure (step ST3). ). When the detected pressure is lower than the target pressure (YES in step ST3), the control unit 53 detects the flow rate by the flow rate detection unit 20 (step ST4), and the detected flow rate is equal to or less than a fixed ratio with respect to the rated flow rate. Is determined (step ST5).

  When the detected flow rate is equal to or less than the fixed ratio with respect to the rated flow rate (YES in step ST5), the control unit 53 causes the check valve 16 provided on the secondary side of the stopped pump device 14 to fail. Is determined to have been made (step ST6). Next, the control unit 53 controls the display unit 50, and notifies the outside that the check valve 16 has failed by the display unit 50 (step ST7). In addition, for example, when the notification unit is provided, the control unit 53 controls the notification unit to notify the failure of the check valve 16 to the outside by sound.

  Next, the control unit 53 detects the flow rate by the flow rate detection unit 20 (Step ST8). Next, the control unit 53 determines whether or not the detected flow rate is equal to or less than the stop flow rate (step ST9). When the detected flow rate is larger than the stop flow rate (NO in step ST9), the control unit 53 continues to drive the pump device 14 and returns to step ST8. If the detected flow rate is equal to or less than the stop flow rate (YES in step ST9), the control unit 53 determines that the flow rate is small, and stops the pump device 14 (step ST10). After the pump device 14 stops, the control unit detects the pressure on the secondary side (discharge side) of the pump device 14 detected by the second pressure detecting unit 21 (step ST11), and the detected pressure is equal to or lower than the starting pressure. Is determined (step ST12). If the detected pressure is higher than the starting pressure (NO in step ST12), the process returns to step ST11, and the monitoring of the pressure on the secondary side of the pump device 14 is continued. When the detected pressure is equal to or lower than the starting pressure (YES in step ST12), the control unit 53 starts the pump device 14 in which the check valve 16 is out of order (step ST13). Until the valve 16 is replaced, the pump device 14 in which the check valve 16 has failed is repeatedly stopped and driven.

  When the detected pressure is equal to or higher than the target pressure (NO in step ST3), or when the detected flow rate is not equal to or lower than a fixed ratio with respect to the rated flow rate (NO in step ST5), the control unit 53 sets Whether the flow rate detection unit 20 on the secondary side of the stopped pump device 14 is detecting the flow rate, in other words, the water flow in the flow path in the discharge pipe 15 on the secondary side of the stopped pump device 14 Is determined (step ST14).

  When the flow rate is not detected by the flow rate detector 20 on the secondary side of the stopped pump device 14, in other words, when no water flow is generated on the secondary side of the stopped pump device 14 (NO in step ST14). Then, the process returns to step ST2, and the driving of the pump device 14 is continued.

  When the flow rate is detected by the flow rate detector 20 on the secondary side of the stopped pump device 14 and a water flow is generated on the secondary side of the stopped pump device 14 (YES in step ST14), the control is performed. The unit 53 determines that the check valve 16 on the secondary side of the stopped pump device 14 has failed (step ST15). Next, the control unit 53 controls the display unit 50, and notifies the information that the check valve 16 has failed to the outside by the display unit 50 (step ST16). Next, the control unit 53 stops the driven pump device 14 (step ST17), detects the pressure with the second pressure detection unit 21 (step ST18), and determines whether the detected pressure is equal to or lower than the starting pressure. Is determined (step ST19).

  When the pressure detected by the second pressure detection unit 21 is higher than the starting pressure (NO in step ST19), the process returns to step ST18, and the monitoring of the pressure on the secondary side of the pump device 14 is continued. . If the detected pressure is equal to or lower than the start-up pressure (YES in step ST19), the control unit 53 starts the pump device 14 in which the check valve 16 is out of order (step ST13). Until the valve 16 is replaced, the pump device 14 in which the check valve 16 has failed is repeatedly stopped and driven.

  According to the water supply device 1 configured as described above, the control unit 53 determines whether the pressure on the secondary side of the pump device 14 is lower than the target pressure and the flow rate is lower than the rated flow rate, or When the water flow is detected by the flow rate detection unit 20 on the secondary side of the pump device 14 that is being stopped, it is determined that the check valve 16 of the stopped pump device 14 is out of order. Further, the control unit 53 stops the pump device 14 immediately after detecting the check valve 16 or after detecting the check valve 16 and after stopping the small amount of water of the pump device 14 being driven. When the pump device 14 is driven at the same time, the pump device 14 provided with the failed check valve 16 is driven.

  Thereby, the water supply device 1 can detect the failure of the check valve 16 even if the check valve 16 provided on the secondary side of any one of the pump devices 14 fails. Further, by driving the failed check valve 16 side, it is possible to prevent the water supply amount from decreasing. That is, if the pump device 14 on the side of the check valve 16 that has failed is stopped and the pump device 14 on the side of the normal check valve 16 is driven, there is a possibility that the amount of water supply may be insufficient. For example, when the actually failed swing type check valve 16 is disposed on the secondary side of the stopped pump device 14 and the amount of water supply is measured, the check valve 16 partially blocks the flow path, There is an example in which the amount is reduced to 75% of the normal state, and from this, the water supply device 1 can prevent a decrease in the amount of water supply.

  Further, after the failure of the check valve 16 is determined, the pump device 14 is stopped when the detected flow rate is equal to or less than the stop flow rate, as in the case of YES in step ST9, and the water supply amount is reduced. In addition, sudden water interruption can be prevented.

  As described above, according to the water supply device 1 according to the embodiment of the present invention, even if any of the plurality of check valves 16 fails, suitable water supply is possible.

  Note that the present invention is not limited to the above embodiment. For example, in the above-described example, the flow detection unit 20 has been described using an example provided on the secondary side of each pump 14b. However, the present invention is not limited to this, and the flow detection unit 20 is connected to the primary side of each pump 14b. May be provided in the branched pipe 13.

  Further, for example, as shown in FIG. 7, the check valve 16 may be a spring-type check valve 16A. Such a spring-type check valve 16 has a smaller water supply amount even in the case of a failure than the swing-type check valve 16. In some cases, the ratio does not fall below a certain ratio with respect to the flow rate, and a failure cannot be determined. However, if a failure occurs in the check valve 16A, a backflow occurs. Therefore, the flow rate is detected by the flow rate detection unit 20 on the secondary side of the stopped pump device 14 by the determination in step ST14. A failure can be detected.

  In the above-described example, the water supply device 1 has been described using an example in which two pump devices 14 are provided. However, the present invention is not limited to this, and a configuration in which three pump devices 14 are provided as shown in FIG. Or four or more. Further, the water supply device 1 may include two or more pump devices 14 and may be configured to not only alternately operate the plurality of pump devices 14 but also operate the plurality of pump devices 14 in parallel. In the case of the parallel operation, the pump device 14 that is started first is set as the pump device 14 in which the check valves 16 and 16A are out of order, the demand for water supply increases, and the pressure detected by the second pressure detecting unit 21 is equal to or lower than the starting pressure. In this case, the pump device 14 provided with the normal check valve 16 may be driven. Similarly, when a plurality of pump devices 14 are driven, when the demand for water supply decreases and the flow rate detected by the flow rate detection unit 20 drops below the disconnection flow rate at which the pump device 14 is disconnected, In this case, the pump may be disconnected from the pump device 14 provided with the normal check valve 16. That is, in the case of driving one or a plurality of pump devices 14, by driving the pump device 14 on the side where the check valves 16 and 16 </ b> A have failed, the backflow phenomenon does not occur, and the water supply capacity Is no longer reduced.

The present invention is not limited to the above-described embodiment, and can be variously modified in an implementation stage without departing from the gist of the invention. In addition, the embodiments may be appropriately combined and implemented, and in such a case, the combined effects can be obtained. Furthermore, the above-described embodiment includes various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent features. For example, even if some components are deleted from all the components shown in the embodiment, if the problem can be solved and an effect can be obtained, a configuration from which the components are deleted can be extracted as an invention.
Hereinafter, the inventions described in the claims of the present application will be additionally described.
[1] A plurality of pump devices having a pump and a motor for driving the pump,
A plurality of discharge pipes respectively provided in the pump,
A merging pipe for merging the plurality of discharge pipes,
A primary side of the pump, or, provided on the secondary side, an impeller that rotates by receiving a water flow, and a flow rate detection unit including a detection unit that detects the rotation of the impeller,
A pressure detector provided on the secondary side of the merging pipe or the merging pipe,
On the secondary side of the pump, and a plurality of check valves respectively arranged on the discharge pipe on the primary side of the merging pipe,
The pump is driven by controlling the driving of the motor, and when any one of the plurality of motors is driven, the pressure detected by the pressure detecting unit falls below the target pressure and detected by the flow detecting unit. When the flow rate is equal to or less than a fixed ratio of the rated flow rate, a control unit that determines that the check valve provided to the stopped pump has failed,
A water supply device comprising:
[2] equipped with an alarm device for sending an alarm,
The water supply device according to [1], wherein the control unit causes the alarm device to send out an alarm when determining that the check valve has failed.
[3] The control unit stops the motor that is being driven when the flow rate detected by the flow rate detection unit is equal to or less than the stop flow rate, and thereafter, the pressure detected by the pressure detection unit is a starting pressure. The water supply apparatus according to [1] or [2], wherein the pump of the check valve, which has been determined to be malfunctioning, is driven when the pressure drops below.
[4] The control unit further determines that the check valve has failed when the flow rate is detected by the flow rate detection unit provided on the secondary side of the stopped pump, [1]. The water supply device according to any one of claims 1 to 3.
[5] The control unit operates the pumps in parallel by driving the plurality of motors, and when determining that the check valve has failed, the check valve has failed. If the pressure detected by the pressure detection unit is reduced to a start pressure or less while driving the pump in which the pump is always started and the check valve is malfunctioning, the check valve is normal. The water supply device according to any one of [1] to [4], wherein the pumps are started in parallel.
[6] The control unit, when the pumps are operating in parallel, when the flow rate detected by the flow rate detection unit falls below the disconnection flow rate, disconnects the pump with the normal check valve. The water supply device according to any one of [1] to [4].

  DESCRIPTION OF SYMBOLS 1 ... Water supply apparatus, 11 ... Suction pipe, 13 ... Branch pipe, 14 ... Pump apparatus, 14a ... Motor, 14b ... Pump, 15 ... Discharge pipe, 16 ... Check valve, 16A ... Check valve, 17 ... Confluence pipe, 18: pressure accumulator, 19: first pressure detector, 20: flow rate detector, 21: second pressure detector, 22: control panel, 24: base, 25: support plate, 26: cover, 31: valve body, 31a ... base, 31b ... valve, 31c ... rectifying fin, 31d ... neck, 32 ... seat, 41 ... impeller, 42 ... detector, 50 ... display, 51 ... inverter, 52 ... storage, 53 ... control Part, 55 ... case.

Claims (6)

A plurality of pump devices having a pump and a motor for driving the pump,
A plurality of discharge pipes respectively provided in the pump,
A merging pipe for merging the plurality of discharge pipes,
A primary side of the pump, or, provided on the secondary side, an impeller that rotates by receiving a water flow, and a flow rate detection unit including a detection unit that detects the rotation of the impeller,
A pressure detector provided on the secondary side of the merging pipe or the merging pipe,
On the secondary side of the pump, and a plurality of check valves respectively arranged on the discharge pipe on the primary side of the merge pipe,
The pump is driven by controlling the driving of the motor, and when any one of the plurality of motors is driven, the pressure detected by the pressure detection unit is reduced to less than a target pressure, and the pump being driven When the flow rate detected by the flow rate detection unit provided in the lower than a certain ratio of the rated flow rate, the control unit that determines that the check valve provided to the stopped pump is broken When,
A water supply device comprising: Equipped with an alarm device that sends out an alarm,
The water supply device according to claim 1, wherein the control unit causes the alarm device to output an alarm when the control unit determines that the check valve has failed.   The control unit, when the flow rate detected by the flow rate detection unit is equal to or less than a stop flow rate, stops the driving motor, and thereafter, the pressure detected by the pressure detection unit decreases to a start pressure or less. 3. The water supply device according to claim 1, wherein the pump of the check valve, which is determined to be malfunctioning, is driven when the pump has failed. 4.   The said control part further judges that the said non-return valve has failed, when the water flow is detected by the said flow detection part provided in the secondary side of the said stopped pump. 4. The water supply device according to any one of 3.   The control unit drives the plurality of motors to operate the pumps in parallel, and when it is determined that the check valve has failed, the control unit determines that the check valve has failed. If the pressure detected by the pressure detecting unit is reduced to a start pressure or less while driving the pump in which the check valve always starts and the check valve is malfunctioning, the check valve is normal. The water supply device according to any one of claims 1 to 4, wherein the water supply devices are activated in parallel.   The control unit, when the pumps are operating in parallel, when the flow rate detected by the flow rate detection unit falls below the disconnection flow rate, the check valve disconnects the normal pump. The water supply device according to any one of claims 1 to 4.