JP2017214898A - Pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress energy loss or a decline in efficiency due to existing relief piping while maintaining effect of relief piping.SOLUTION: A pump unit includes: a pump; relief piping connected to the pump; a relief valve installed to the relief piping; and a control device for controlling the relief valve to open when a prescribed condition regarding an operational state of the pump is met.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a pump unit.

In a water supply apparatus for supplying water to a building or a condominium, for example, a relief pipe is always provided for the following reasons.
(1) Prevention of air lock phenomenon during suction operation The air lock phenomenon is a phenomenon in which air is accumulated in the pump and pumping becomes impossible. By always installing a relief pipe, a constant amount of water can always flow and the air lock phenomenon can be prevented.
(2) Prevention of shaft seal breakage in vertical pumps In vertical pumps, the discharge port is often not in the upper part of the casing. is there. The upper part of the casing is a shaft seal, and when the pump is started with air in the shaft seal, sliding parts such as the mechanical seal and bearings of the shaft seal generate heat and are damaged. Sometimes. Therefore, a constant escape pipe for the purpose of venting air is provided at the uppermost part of the casing. However, while it is discharged together with water during operation of the pump, it is difficult for air to accumulate. However, when the pump is stopped or during operation with a small amount of water, there is no water flow or it is weak, so air tends to accumulate.
(3) Prevention of overheating of the pump The water supply device is operated in an automatic operation mode in which the use of water at the supply destination is detected and the pump is started and stopped. In the automatic operation mode, for example, a forced operation by a timer (also referred to as a state watching operation) may be performed before stopping due to a small amount of water in order to suppress the frequency of starting the pump. In addition, when detection of a small amount of water is impossible due to a failure of a sensor for detecting a small amount of water, the operation in a state where water is not used at the supply destination, that is, in a deadline state, is continued for a certain period of time. Therefore, the water temperature in the pump rises. In order to prevent overheating of the pump due to the small water amount operation and the shut-off operation, a relief pipe is always provided, a certain amount of water is discharged out of the pump, and the discharged water is returned to the water receiving tank or is discharged.

  Examples of the above-described constant relief pipe are described in Patent Documents 1 to 3. FIG. 3 of Patent Document 1 shows a configuration in which water that has always flowed through the escape pipe is returned to the water receiving tank. Patent Document 2 discloses a configuration in which an intake / exhaust valve is provided on the secondary side of a relief pipe in order to perform air bleeding at the time of starting the pump. Patent Document 3 shows the structure of a relief pipe of a vertical multistage pump.

Utility Model Registration No. 2534284 Japanese Utility Model Publication No. 61-140190 JP 2004-308499 A

  The water that has always flowed into the escape pipe is returned to the water receiving tank or drained as described in Patent Document 1 above, but the amount of water (for example, several tens of liters per minute per pump) ) Is often returned to the water tank. However, there is a case where it is prohibited to return the water that has passed through the pump to the water receiving tank from the viewpoint of water source contamination. In such a case, all the water that flows into the escape pipe becomes waste water.

  Further, when the constant relief pipe is provided, the amount of water flowing through the constant relief pipe is subtracted from the pumped water amount, so that the performance of the pump is lowered as compared with the case where the constant relief pipe is not provided.

  The present invention has been made in view of the above points. One of the objects of the present invention is to provide a water supply unit capable of suppressing an energy loss or a decrease in efficiency due to a conventional escape pipe while maintaining the effect of the escape pipe.

  According to an aspect of the present invention, a pump, a relief pipe connected to the pump, a relief valve installed in the relief pipe, and a control for opening the relief valve when a predetermined condition regarding the operation state of the pump is satisfied There is provided a pump unit comprising a control device for performing the above.

  In the above configuration, by controlling the opening and closing of the relief valve according to the operation state of the pump, it is possible to suppress the energy loss or the efficiency reduction due to the conventional relief pipe while maintaining the effect of the relief pipe.

  The pump includes a plurality of pumps, the relief pipe includes a plurality of individual pipes connected to each of the plurality of pumps, and a collective pipe where the plurality of individual pipes merge, and the relief valve is installed in the collective pipe. Also good. In this case, the predetermined condition may include starting any of the plurality of pumps. Further, the predetermined condition may include that all of the plurality of pumps are stopped. Further, the predetermined condition may include that the flow rate in any of the plurality of pumps is a predetermined amount or less.

  Alternatively, the pump includes a plurality of pumps, the relief pipe includes a plurality of individual pipes connected to each of the plurality of pumps, and the relief valve includes a relief valve installed in each of the plurality of individual pipes. But you can. In this case, the control device may individually control the relief valves respectively installed in the plurality of individual pipes. In this case, the predetermined condition may include starting a pump to which an individual pipe on which the relief valve is installed is connected. Furthermore, the predetermined condition may include stopping a pump to which an individual pipe on which the relief valve is installed is connected. Further, the predetermined condition may include that the flow rate in the pump to which the individual pipe in which the relief valve is installed is connected is equal to or less than a predetermined amount.

  When the pump is started, the control device may maintain the relief valve opened for the first time regardless of the target rotational speed of the started pump. The first time may be the maximum acceleration time of the pump. The control device may perform control to open the relief valve when the state where the flow rate in the pump is equal to or less than a predetermined amount continues for the second time. The second time may be a maximum deceleration time of the pump.

  The control device includes: an open / close state of the relief valve; an open / close state of a flow switch included in the pump unit; an operation state or a stop state of the pump; a detection time when the flow rate in the pump is equal to or less than a predetermined amount; You may include the display part which displays the information regarding time.

The control device includes: an open / close state of the relief valve; an open / close state of a flow switch included in the pump unit; an operation state or a stop state of the pump; a detection time when the flow rate in the pump is equal to or less than a predetermined amount; You may include the communication part which transmits the information regarding time to the said external display. In this case, the communication unit may be a control-device-side antenna unit that receives radio waves from the external display and converts the radio waves into electric power. The communication unit may communicate with the external display by near field communication (NFC).

It is a side view which shows the water supply unit which concerns on the 1st Embodiment of this invention. It is a top view which shows the water supply unit which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the 1st example of control in the 1st Embodiment of this invention. FIG. 3 is a time-series diagram illustrating a specific example of control executed according to the flowchart of FIG. 2. It is a flowchart which shows the 2nd example of control in the 1st Embodiment of this invention. FIG. 5 is a time-series diagram illustrating a specific example of control executed according to the flowchart of FIG. 4. It is a side view which shows the water supply unit which concerns on the 2nd Embodiment of this invention. It is a top view which shows the water supply unit which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the 1st example of control in the 2nd Embodiment of this invention. It is a flowchart which shows the 1st example of control in the 2nd Embodiment of this invention. It is a schematic block block diagram which shows an example of a structure of the control panel in a water supply unit. It is a figure which shows other embodiment of the control panel in a water supply unit. It is a figure which shows other embodiment of the control panel in a water supply unit.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  1A and 1B are views showing a water supply unit according to the first embodiment of the present invention. The water supply unit is a water supply device that supplies water to a building or a building such as an apartment, and is an example of a pump unit according to the present invention. As shown in the figure, the water supply unit includes three vertical pumps 1 for pumping water (tap water), and a control panel (control device) 2 for controlling the operation of these vertical pumps 1, respectively. The piping part 3 connected to the vertical pump 1 and the gantry 9 on which the vertical pump 1 is placed are provided. The vertical pump 1 includes a plurality of impellers (not shown), a casing (not shown) that accommodates these impellers, and a motor 7 that rotationally drives the impellers. A suction port 5 and a discharge port 6 are provided in the lower part of the vertical pump 1, and these are located at the same height. The suction port 5 is connected to a water receiving tank 25 or a water main (not shown), and the discharge port 6 is connected to the piping part 3.

  The pipe section 3 includes three connecting pipes 11, one discharge pipe (discharge header) 12, and a suction pipe (suction header; not shown). The upstream end of the connecting pipe 11 is connected to the discharge port 6 of each vertical pump 1, and the downstream end of each connecting pipe 11 is connected to the discharge pipe 12. With such a configuration, the water discharged from each vertical pump 1 is transferred to the discharge pipe 12 via each connection pipe 11, and the flow of water is merged in the discharge pipe 12.

The connecting pipe 11 is provided with a flow switch 14 that switches when the flow rate is equal to or less than a predetermined amount, a check valve 15 that prevents backflow of water, and a sluice valve 16 that opens and closes the connecting pipe 11. A signal line of the flow switch 14 is connected to the control panel 2, and a signal (small amount of water) having a flow rate equal to or less than a predetermined amount is transmitted from the flow switch 14 to the control panel 2. The water flowing into the connection pipe 11 passes through the flow switch 14, the check valve 15, and the sluice valve 16 in this order, and is discharged to the outside through the discharge pipe 12. The outlet 12a of the discharge pipe 12 is connected to, for example, a water supply pipe installed in a building, and the water supply pipe is connected to a water demand destination (for example, a faucet) in the building.

  The detection of the small amount of water is not limited to the flow switch 14 that switches when the flow rate is equal to or less than the predetermined amount, and a flow meter such as an electromagnetic flow meter may be used. Furthermore, not only the flow switch 14 provided for each pump, but only one discharge pipe 12 may be provided. In this case, the small water amount at the water demand destination is detected instead of detecting the state of the small water amount for each pump. Moreover, it is good also considering the light load state (For example, conditions that an electric current value is below a fixed value) of the inverter provided for every vertical pump 1 mentioned later as a small amount of water.

  A pressure sensor (not shown) is provided on the discharge side of each vertical pump 1 to detect the pressure of water discharged from the vertical pump 1 (hereinafter also referred to as discharge pressure). The pressure sensor is connected to the control panel 2, and the detection value of the pressure sensor is transmitted from the pressure sensor to the control panel 2.

  The control panel 2 includes an inverter (not shown), and the rotational speed of the motor 7 of the vertical pump 1 is accelerated and decelerated by the inverter. The control panel 2 controls the rotational speed of the motor 7 of the vertical pump 1.

  The water supply unit according to the present embodiment has an automatic operation mode. In the automatic operation mode, when water is used at a customer (for example, when a faucet in a building is opened), the vertical pump 1 is stopped for a short time to supply water, and the use of water ends (for example, in a building) The vertical pump 1 is stopped for a small amount of water. Specifically, when all the vertical pumps 1 are stopped, the control panel 2 recognizes that water has been used at the demand destination when the discharge pressure falls below an arbitrary value (starting pressure). Start. Based on the detected value (discharge pressure) sent from the pressure sensor, the rotational speed of the motor 7 of the vertical pump 1 is controlled by the known constant terminal pressure constant control or discharge pressure constant control. When the amount of water used at the demand increases, the suspended vertical pump 1 is added as necessary. On the contrary, when the amount of water used at the demand destination decreases, the vertical pumps 1 in parallel operation are disconnected. When the number of pumps to be operated becomes one and the flow switch 14 in the operating vertical pump 1 detects a small amount of water, the vertical pump 1 is stopped. Before stopping, the pressure may be increased to a pressure tank (not shown) as necessary. The state where all the vertical pumps 1 are stopped at a small amount of water is referred to as a small amount of water stop. If the discharge pressure falls below the starting pressure as described above while the small amount of water is stopped, the vertical pump 1 is restarted for a short stop. Normally, the water sucked from the suction port 5 is boosted to a predetermined pressure by the vertical pump 1 by the pump control in such an automatic operation mode, and the amount of water required at the customer is obtained via the piping unit 3. The carrier liquid is supplied.

  In the present embodiment, the relief pipes connected to the vertical pump 1 are three individual pipes 22 connected to each of the three vertical pumps 1, and a collective pipe 23 where the three individual pipes 22 merge. including. Further, the individual pipe 22 is provided in a casing portion above the impeller of each vertical pump 1. Each individual pipe 22 is composed of a check valve 27 for preventing backflow from other pumps and a gate valve 24 (ball valve, groove valve, etc.) used for maintenance and the like, and is connected to the collective pipe 23. . The collecting pipe 23 communicates with the water receiving tank 25 or a drainage path (not shown). Furthermore, a relief valve 26 is installed in the collecting pipe 23. The control panel 2 controls the opening and closing of the relief valve 26 according to the operating state of the vertical pump 1 as in the example described below.

As the relief valve 26, a valve that opens and closes by an electric signal such as an electromagnetic valve or an electric valve is used. Further, when the relief valve 26 is opened, water flows into the relief pipe and is drained out of the vertical pump 1. Here, for example, when the relief valve 26 cannot be controlled due to a failure of the control panel 2 or the like, it is preferable to use a valve that is closed when energized so that the relief valve 26 is always drained by a relief pipe. When the signal line from the control panel 2 breaks down due to disconnection or the like, the relief valve 26 is opened regardless of the operation state of the vertical pump 1, so that water is wasted but the vertical pump 1 is Water supply can be continued by preventing the operation from being disabled by the air lock.

  FIG. 2 is a flowchart showing a first example of control in the first embodiment of the present invention. The process described below is executed in the control panel 2 that controls the relief valve 26.

  After the power supply unit is turned on, the pump start time and the small water amount detection time are set to 0 (STEP 0). Next, it is determined whether or not there is a starting pump (STEP 1). Here, it is determined that there is a starting pump at the time of a short stop restart or a pump addition.

  In the present embodiment, the start and stop of the pump are controlled in the automatic operation mode described above based on the detected value of the pressure sensor provided on the discharge side of the vertical pump 1 and the opening / closing of the flow switch 14. The In the following description, the control panel 2 executes control of one relief valve 26 using the results of start and stop control for each of the three vertical pumps 1.

  If the start pump is found in STEP 1, the pump start time is set to 0 (STEP 2), and the relief valve 26 is opened (STEP 3). In this case, the relief valve 26 is opened when it is closed, and is maintained when it is already opened. Thereafter, with the relief valve 26 open, the pump start time is counted as time passes (STEP 4), and the count is continued until the pump start time reaches the maximum acceleration time (STEP 5). Here, the maximum acceleration time is the time for the rotation speed of the inverter that drives the motor 7 to reach from 0 to the maximum rotation speed, and is usually set as the acceleration time of the inverter. Accordingly, if the vertical pump 1 can be pressurized normally, the air in the vertical pump 1 is sufficiently discharged through the escape pipe during the maximum acceleration time from the start. If the air in the vertical pump 1 can be sufficiently discharged, the maximum acceleration time, which is the time during which the relief valve 26 is kept open, is not necessarily limited to the acceleration time of the inverter. It may be a set time. In the illustrated example, the time for maintaining the relief valve 26 open at the start of the pump is a fixed time regardless of the target rotational speed of the pump to be started (determined by the control panel 2 and may vary depending on the case). By doing so, the control of the control panel 2 with respect to the relief valve 26 can be simplified.

  Next, the presence / absence of an operating pump is determined (STEP 10). This determination is executed when there is no start pump in the determination of STEP 1 or when it is determined that the count of the pump start time is ended in STEP 5 (Yes in STEP 5). If there is no operating pump in STEP 10, the relief valve 26 is opened (STEP 15). In this case as well, the relief valve 26 is opened when it is closed, and is maintained when it is already opened. The state of STEP 15 is a state where all the vertical pumps 1 are stopped and the relief valve 26 is opened. Thereafter, the control returns to the above STEP0.

  Even if the relief valve 26 is opened while the pump is stopped, the water in the vertical pump 1 is not drained. Therefore, by opening the relief valve 26 in STEP 15, the relief valve 26 is in the open state at the next stop restart even if the relief piping is disabled due to some trouble while the vertical pump is stopped. The vertical pump 1 can normally supply water.

On the other hand, if there is an operating pump in the determination of STEP 10, it is further determined whether or not the flow switch 14 is ON (closed) (STEP 11). In this example, the flow switch 14 is turned on when a small water amount state in which the flow rate of the connecting pipe 11 is equal to or less than a predetermined amount is detected. Therefore, the state in which the flow switch 14 is ON in the determination of STEP 11 means that there is a vertical pump 1 that is operating in a small water amount state (small water amount operation). When a small water amount state is detected during the operation of the vertical pump 1, the control panel 2 performs a forced operation for a predetermined time before stopping the vertical pump 1 in order to limit the number of times the pump starts and stops. That is, a state driving is carried out. The flow switch used for controlling the vertical pump 1 itself and the flow switch used for controlling the relief valve 26 are described as the same flow switch 14 in this embodiment. Separate flow switches may be provided for each control.

  In the above case, if the small water amount operation is continued, the relief valve 26 is opened (STEP 14). Before that, the small water amount detection time is counted as time passes (STEP 12), and the small water amount detection time is the maximum deceleration time. The count is continued until it reaches (STEP 13). During this time, the relief valve 26 is not opened unless it is already open. Here, the maximum deceleration time is the time for the rotation speed of the inverter that drives the motor 7 to reach 0 from the maximum rotation speed, and is normally set as the deceleration time of the inverter. In the illustrated example, the maximum deceleration time is used as an index of the time until the water amount fluctuation is stabilized.

  For example, the amount of water used at the supply destination may be maintained in the vicinity of the amount of water at which the state of the flow switch 14 changes, and the flow switch 14 may frequently be turned on and off repeatedly. Since the durability of the relief valve 26 (for example, the number of times it can be opened and closed) is limited, it is preferable to frequently open and close the relief valve 26 corresponding to ON / OFF of the flow switch 14 in such a case. Absent. Therefore, in the illustrated example, the relief valve 26 is opened only when the state in which the flow switch 14 is switched continues for a predetermined time (maximum deceleration time). Note that, as described above, the maximum deceleration time is used as an index of the time until the detection of the small amount of water is stabilized, so the time used for standby or delay when the flow switch 14 is switched is not necessarily the deceleration of the inverter. It may not be time, and may be a time set separately.

  Note that the processing of STEP 1 to STEP 11 is also executed during the counting of the small water amount detection time. Therefore, for example, when the small water amount state is resolved and the flow switch 14 is not turned ON in the determination of STEP 11, the count is interrupted and the relief valve 26 is not opened.

  If the small water amount detection time reaches the maximum deceleration time in the determination of STEP 13, the relief valve 26 is opened (STEP 14). The state after STEP 14 is a state in which there is the vertical pump 1 in which the flow switch 14 is ON and the small water amount operation is continued, and the relief valve 26 is opened.

In this embodiment, in order to perform constant discharge pressure control or estimated terminal pressure constant control, the rotational speed control of the vertical pump 1 is performed by an inverter. When the vertical pump 1 is operated with a small amount of water for a long time, the gas dissolved in the liquid comes out or the air mixed in from the suction side is not exhausted sufficiently, and a lot of gas stays in the casing of the vertical pump 1 Air lock is likely to occur. When the flow switch 14 is ON, that is, when the amount of water conveyed to the supply destination is small, the relief valve 26 is opened, and the air in the vertical pump 1 is discharged together with water through the relief pipe. The amount of water transported by the pump 1 is increased, the number of rotations is increased, and air lock can be prevented by preventing air from staying.

In the present embodiment, the flow switch 14 detects a small amount of water in the pipe section 3 and the flow rate of the escape pipe does not affect the ON / OFF of the flow switch 14. This makes it possible to prevent the vertical pump 1 from continuing to operate even though the flow rate in the escape pipe is mistaken as the use of water at the supply destination and water is not used at the supply destination.

  On the other hand, if it is determined in STEP 11 that the flow switch is not ON, the small water amount detection time is set to 0 (STEP 20), and the relief valve 26 is closed (STEP 21). In this case, the relief valve 26 is closed when it is open, and is maintained when it is already closed. The state after STEP 21 is a state in which the vertical pump 1 is operated with a normal amount of water that is not a small amount of water, and the relief valve 26 is closed. Thereafter, the control returns to the above STEP1.

  FIG. 3 is a time-series diagram illustrating a specific example of control executed according to the flowchart of FIG. For simplicity, a case will be described in which two (shown as pump X and pump Y) of three vertical pumps 1 included in the water supply unit are operated. The control when the three vertical pumps 1 are operated can be performed similarly to the illustrated example.

First, at time t _0, the pump X and pumps Y is stopped, the relief valve 26 is open. When the discharge pressure falls below the starting pressure, the control panel 2 recognizes that water is being used at the supply destination and starts the pump X (time t ₁ ). At this time, in the flowchart of FIG. 2, it is determined in STEP1 that there is a starting pump, and the process proceeds to STEP2 and STEP3. However, since the relief valve 26 has already been opened, the state in which the relief valve 26 is opened is maintained in STEP3. Then, pump X is accelerated to a predetermined discharge pressure until the time t ₂ according to the control of the control panel 2, then is driven by a variable speed controlled by the discharge pressure constant control or estimated terminal pressure constant control . Meanwhile, the state in which the relief valve 26 is opened, and continues until time t _3. Time t ₃ is the time at which the maximum acceleration time has elapsed from the time t _1. At this time, the pump X is operating with a normal amount of water, and there is no other pump that is operating or a pump that is operating with a small amount of water (flow switch ON). Therefore, as a result of the determination in STEP 10 and STEP 11, the relief valve 26 is closed by the processing in STEP 21.

After that, when the amount of water used in the supply destination at time t ₄ is increased, only the pump X is a shortage of water supply amount. At time t _4, the control panel 2, and decides to pump additional, starting the pump Y in addition to the already pump X in operation. Also at this time, in the flowchart of FIG. 2, it is determined in STEP1 that there is a starting pump, and the process proceeds to STEP2 and STEP3. In STEP3, the time _{t 3} the relief valve 26 has been closed and later opened. Thereafter, the pump Y is accelerated to a predetermined discharge pressure until a time t ₅ in accordance with the control of the control panel 2, then is driven by a variable speed controlled by the discharge pressure constant control or estimated terminal pressure constant control . Meanwhile, the state in which the relief valve 26 is opened, and continues until time t _6. Time t ₆ is a time at which the maximum acceleration time has elapsed from the time t _4. At this time, both the pump X and the pump Y are operating with a normal amount of water, and there are no other operating pumps or pumps operating with a small amount of water (flow switch ON). As a result of the determination, the relief valve 26 is closed by the processing of STEP 21.

After that, when the amount of water at the supply destination decreases and the amount of water that can be supplied by a single pump is reached, the flow rate of the connecting pipe 11 of the pump Y generates a small amount of water that is less than a predetermined amount, and the flow switch of the pump Y 14 becomes ON (time t ₇ ). When the flow switch 14 remains on for a certain period, the control panel 2 stops the pump Y (time t ₉ ) and disconnects it. As described above, the standby or delay of the maximum deceleration time in STEP 12 and STEP 13 of FIG. 2 is executed, so that the relief valve 26 is not opened immediately after the flow switch 14 of the pump Y is turned ON (time t ₇ ). In the illustrated example, it is also still a small amount of water state occurs at time t ₈ the maximum deceleration time has elapsed from the time t _7, the small amount of water pump operation Y is continued. In this case, the control panel 2 to open the relief valve 26 at time _{t 8} (STEP14). After the pump Y is disconnected (time t ₉ ), if the amount of water used at the supply destination is the amount of water that can be covered by one pump and is not small (time t ₉ to time t ₁₀ ), the determination in STEP 11 Becomes No and the relief valve 26 is closed.

When the amount of water at the supply destination further decreases, the small amount of water is detected by the flow switch 14 of the pump X (time t ₁₀ ), and then the pump X is stopped (time t ₁₂ ). The control panel 2 performs a forced operation for a predetermined time, that is, a state watching operation, before the pump X is stopped by a small amount of water. Time _{t 9} and later, although relief valve 26 is a closed state, since the wait or delay of maximum deceleration time is executed in STEP12 and STEP13 of as described above Figure 2, immediately after the start of the ON of the flow switch 14 The relief valve 26 is not opened. In the illustrated example, still has a small amount of water condition occurs even at the time t ₁₁ to the maximum deceleration time has elapsed from the time t _10, wait and see the operation of the pump X is continued. In this case, the control panel 2 to open the relief valve 26 at time t _11.

Results Small amount of water state flow switch 14 of the pump X is ON is continued until time t _12, the control panel 2 terminates the wait-and-see operation to stop the pump X at time t _12. At this time, in the flowchart of FIG. 2, it is determined in STEP 10 that there is no operating pump, and the process proceeds to STEP 15. However, since the relief valve 26 is already opened, the state where the relief valve 26 is opened is maintained in STEP15. Time t ₁₂ after the state is pumped X and pump Y is stopped, a state in which the relief valve 26 is he the same as the state of the time t _0.

  Further, even when the small amount of water is not stopped, all the vertical pumps 1 in operation in the water supply unit may be stopped due to some abnormality or a pump stop command, for example. Also in this case, it is determined in STEP 10 that there is no pump in operation, and the relief valve 26 is opened in STEP 20 and STEP 21. Further, when the automatic operation mode is canceled and the vertical pump 1 is operated or stopped by manual operation, the relief valve 26 may be kept open at all times.

  In the control according to the first example as described above, when the vertical pump 1 is operating at a normal amount of water in the automatic operation mode, the relief valve 26 is closed and the drainage from the relief pipe is discharged. Blocked. As described above, the drainage effect of the escape pipe is, for example, when the amount of water is low, which is likely to cause air-water separation, and the air is not discharged together with the water. It is obtained during the operation or during the operation of watching the water temperature in the pump rising. Therefore, even if the drainage from the escape pipe is cut off when the pump is operating with a normal amount of water, the above-described effect is maintained. Further, when the pump is operating with a normal amount of water, it is possible to suppress energy loss or reduction in pump efficiency by blocking drainage from the escape pipe.

  FIG. 4 is a flowchart showing a second example of control in the first embodiment of the present invention. Similar to the example shown in FIG. 2, the processing described below is executed in the control panel 2 that controls the relief valve 26. Note that the processing of STEP0 to STEP5, STEP10 to STEP14, STEP20, and STEP21 shown in FIG. 4 is the same as that shown in FIG. The example of FIG. 4 differs from the example of FIG. 2 in that when there is no operating pump in the determination of STEP 10, the processing of STEP 21 is executed instead of STEP 15 and the relief valve 26 is closed. Hereinafter, this point will be particularly described.

In STEP 10, the presence / absence of an operating pump is determined. This determination is executed when there is no start pump in the determination of STEP 1 and when the pump opens the relief valve 26 after the start and the count of the pump start time reaches the maximum acceleration time. This is the same as the example. Further, when there is an operating pump, the process proceeds to the determination of the flow switch 14 in STEP 11 as in the example of FIG. On the other hand, in the illustrated example, when there is no operating pump in the determination of STEP 10, the small water amount detection time is set to 0 (STEP 20), and the relief valve 26 is closed (STEP 21). These processes are the same as when the flow switch 14 is not ON in the determination of STEP11.

  FIG. 5 is a time-series diagram showing a specific example of control executed according to the flowchart of FIG. Similarly to FIG. 3, a case will be described in which two of the three vertical pumps 1 included in the water supply unit (shown as pump X and pump Y) are operated.

As a difference from the example described with reference to FIG. 3 above, at time t ₀ , the relief valve 26 is closed while the pump X and the pump Y are stopped. When the pump X is started at time _{t 1,} the processing of determination and STEP3 of STEP1, relief valve 26 is opened. Thereafter, processing up to time t ₁₂ the pump X is stopped small amount of water is similar to the example of FIG. When the control panel 2 is small amount of water stopped the pump X at time _{t 12,} it is determined that there is no pump in operation in STEP 10, the process proceeds to STEP20 and STEP 21. Since the relief valve 26 in STEP21 is closed, the time _{t 12} after the state, relief valve 26 Pump X and pumps Y is stopped in the same state as the above time _{t 0} closed.

  In the control according to the second example as described above, the amount of water discharged while the vertical pump 1 is stopped is reduced by closing the relief valve 26 when there is no pump in operation. Can do. For example, when the pressure of the main water pipe is applied to the suction port 5 of the vertical pump 1 or when the water receiving tank is installed at a position higher than the pump, the relief pipe is provided even if the vertical pump 1 is stopped. Since the water in the vertical pump 1 is discharged through the control, the control as in the second example is effective. In this case, since the pump is stopped and the impeller is not rotating, air easily accumulates in the casing. However, when the pump is started, the relief valve 26 is opened and the air is discharged to dry the shaft seal. The operation can be quickly eliminated, and heat generation of sliding parts such as bearings can be prevented.

  In the above two examples, the relief valve 26 is opened both when the vertical pump 1 is started and when the flow rate in the vertical pump 1 is a predetermined amount or less. In the case where the time of the state watching operation of 1 is short, the control for opening the relief valve 26 when the flow rate in the vertical pump 1 is equal to or less than the predetermined amount may be omitted.

  3 and 5, the additional pump Y was disconnected first with a decrease in the amount of water to be supplied, and the starting pump X was stopped for a small amount of water, but the starting pump X was disconnected first and the pump Y was disconnected. A small amount of water may be stopped. In these cases, the same effect can be obtained by controlling the opening and closing of the relief valve 26 based on the flowchart of FIG.

  6A and 6B are views showing a water supply unit according to the second embodiment of the present invention. As shown in the figure, the water supply unit includes three vertical pumps 1 for pumping water (tap water) and a control panel (control device) 2 for controlling the operation of these vertical pumps 1. ing. In addition, about the structure of the water supply unit containing the piping part 3, the suction inlet 5, the discharge outlet 6, the motor 7, the mount 9, the connection piping 11, the discharge piping 12, the flow switch 14, the check valve 15, and the sluice valve 16, Since it is the same as that of 1st Embodiment demonstrated with reference to FIG. 1A and FIG. 1B, the overlapping detailed description is abbreviate | omitted.

  In the present embodiment, the escape pipe 31 connected to the vertical pump 1 is not a collective pipe, but individually leads to the water receiving tank 25 or a drainage path (not shown). In this case, a back flow of water does not occur between the vertical pumps 1 via the relief pipe 31, and therefore a check valve need not be provided in the relief pipe 31. Each of the three relief pipes 31 is provided with a relief valve 32. As in the example described below, the control panel 2 individually controls the opening and closing of the relief valves 32 installed in the vertical pump 1 in accordance with the operating state of each vertical pump 1.

  Here, as in the first embodiment, the relief valve 32 is a valve that opens and closes by an electrical signal, such as an electromagnetic valve or an electric valve. Further, when the relief valve 32 is opened, water flows into the relief pipe 31 and is drained out of the vertical pump 1. Here, for example, when the relief valve 32 cannot be controlled due to a failure of the control panel 2 or the like, it is preferable to use a valve that is closed when energized so that the relief valve 32 is always drained.

  FIG. 7 is a flowchart showing a first example of control in the second embodiment of the present invention. The process described below is executed in the control panel 2 that controls the relief valve 32. As a difference from the first embodiment, in this embodiment, since the relief valve 32 is individually installed in each relief pipe 31, the processing described below is executed independently for each relief valve 32. The Therefore, the pump start time and the small water amount detection time used in the process are also counted independently by each vertical pump 1. For example, when three vertical pumps 1 are installed as shown in FIGS. 6A and 6B, the control panel 2 executes three independent controls (the flowchart of FIG. 7). And three independent pump start times and small water volume detection times are counted.

  After the water supply unit is turned on, the pump start time and small water amount detection time (hereinafter, for simplicity) of the vertical pump 1 (the pump) in which the control target relief valve 32 (the pump relief valve) is installed The pump start time and the small water amount detection time are simply set to 0 (STEP 0). Next, it is determined whether or not the pump is started (STEP 1). In the present embodiment, the state of the vertical pump 1 other than the pump included in the water supply unit does not affect the determination of opening / closing of the pump relief valve. Accordingly, it may be determined in STEP 1 that the pump is started when the pump is restarted in a short stop or when the pump is added.

  In this embodiment, as in the first embodiment, the start and stop of the pump is based on the detected value of the pressure sensor provided on the discharge side of the vertical pump 1 and the opening / closing of the flow switch 14. The control panel 2 controls the automatic operation mode described above. In the following description, the control panel 2 executes the control of the pump relief valve using the result of the start and stop control for the pump.

  If it is determined in STEP 1 that the pump starts (switches from stop to operation) (Yes), the process proceeds to STEP 2 and the pump start time is set to zero. If it is determined in STEP1 that the pump is not at the start timing (No), STEP2 to STEP5 are not executed and the process proceeds to STEP10.

  In STEP2, the pump start time is reset, and in STEP3, the pump relief valve is opened. In this case, the pump relief valve is opened when it is closed, and maintained when it is already open. Thereafter, while the pump relief valve is kept open, the pump start time is counted until the maximum acceleration time is reached (STEP4, STEP5), and then the process proceeds to STEP10. This means that the pump solenoid valve is forcibly opened until the pump start time reaches the maximum acceleration time. As in the first embodiment, the maximum acceleration time may be the acceleration time of the inverter that drives the motor 7 of the pump, or another value.

Next, when the pump is not in operation at STEP 10 (STEP 10 is No), the pump relief valve is opened (STEP 15). Also in this case, the pump relief valve is opened when it is closed, and the state is maintained when it is already opened. The state after STEP 15 is a state where the pump is stopped and the relief valve 32 is opened. Thereafter, the control returns to the above STEP0.

  On the other hand, when the pump is operating in STEP 10 (STEP 10 is Yes), it is further determined whether or not the flow switch 14 of the pump is ON (STEP 11). Also in this example, similarly to the example of FIG. 2, the flow switch 14 of the pump is turned on when a small water amount state in which the flow rate of the connecting pipe 11 is equal to or less than a predetermined amount is detected. Therefore, the state in which the flow switch 14 of the pump is ON in the determination of STEP 11 means that the pump is operating in a small water amount state. In this case, the control panel 2 may perform a forced operation for a predetermined time, that is, a state watching operation, before stopping the vertical pump 1.

  When the flow switch 14 of the pump continues to be ON (Yes in STEP 11), the pump small water amount detection time is counted (STEP 12), and the pump small water amount detection time reaches the maximum deceleration time (STEP 13). If yes, the pump relief valve is opened (STEP 14). Here, as in the first embodiment, the maximum deceleration time may be the deceleration time of the inverter of the pump or another value. Also in this embodiment, the relief valve 32 is not opened / closed in correspondence with ON / OFF of the flow switch 14, but only when the flow switch 14 remains on for a predetermined time (maximum deceleration time). The relief valve is opened.

  Note that the processing of STEP 1 to STEP 11 is performed even while the maximum deceleration time is being counted (NO in STEP 13). Therefore, for example, when the small water amount state is resolved and the flow switch 14 of the pump is not turned ON in the determination of STEP 11 (No in STEP 11), the count of the pump small water amount detection time is cleared to 0 in STEP 20. Further, in STEP 21, the pump relief valve is closed, and drainage by the pump relief pipe 31 is stopped.

  If it is determined in STEP 13 that the small water amount detection time has reached the maximum deceleration time (YES in STEP 13), the pump relief valve is opened (STEP 14). The state after STEP 14 is a state in which the pump continues to operate with a small amount of water and the relief valve 32 provided in the relief pipe 31 of the pump is open.

  Also in this example, as in the first embodiment, since the rotation speed of the pump is controlled by the inverter, the rotation speed of the pump is low when the amount of carrier liquid pressurized by the pump is small. There is a risk that air lock will occur. When the flow switch 14 of the pump is ON, an air lock can be prevented by opening the relief valve of the pump, increasing the amount of water transported by the pump and increasing the rotation speed of the pump. In this embodiment, the flow switch 14 of the pump detects the small amount of water in the connection pipe 11 of the pump and does not detect the flow rate of the escape pipe 31, so that the flow rate of the relief pipe 31 of the pump is the flow of the pump. Does not affect ON / OFF of the switch 14. This is because the flow rate in the escape pipe 31 of the pump is misidentified as the use of water at the supply destination, and it is possible to prevent the vertical pump 1 from continuing to be operated even though there is no use of water at the supply destination. it can.

  If the flow switch of the pump is not ON in the determination of STEP 11, the small water amount detection time is set to 0 (STEP 20), and the relief valve 32 is closed (STEP 21). In this case, the pump relief valve is closed when it is open, and maintained when it is already closed. The state after STEP 21 is a state in which the pump is operated with a normal amount of water that is not a small amount of water, and the pump relief valve is closed. Thereafter, the control returns to the above STEP1.

In the control according to the first example as described above, when the pump is operating at a normal amount of water, the pump relief valve is closed, and the drainage from the relief pipe 31 connected to the pump is discharged. Blocked. As already described with respect to the first embodiment, the effect of the escape pipe 31 is maintained even if the drainage from the escape pipe 31 is shut off when the pump is operating with a normal amount of water. Further, when the pump is operating with a normal amount of water, it is possible to suppress energy loss or a decrease in efficiency of the pump by blocking the drainage from the escape pipe 31.

Further, when compared with the first embodiment, the number of relief valves 32 to be controlled is increased in this embodiment, but when each vertical pump 1 is operating with a normal amount of water, the relief pipe 31 is surely provided. The drainage from can be cut off. That is, in the case of the first embodiment, even if a certain vertical pump 1 is operating at a normal water amount, for example, when the other vertical pump 1 is started, the relief valve 26 is opened (for example, FIG. between time t _{4 ~} time t ₆ in the example shown in 3. pump X but is operating in the normal amount of water, relief valve 26 to the pump Y is started is opened), the amount energy loss Or a reduction in efficiency is inevitable. In the present embodiment, by individually controlling the relief valve 32 provided in the relief pipe 31 of each vertical pump 1, energy loss or efficiency reduction can be minimized while maintaining the effect of the relief pipe 31. it can.

  FIG. 8 is a flowchart showing a second example of control in the second embodiment of the present invention. Similar to the example shown in FIG. 7, the processing described below is executed in the control panel 2 that controls each relief valve 32. Note that the processing of STEP0 to STEP5, STEP10 to STEP14, STEP20, and STEP21 shown in FIG. 8 is the same as that shown in FIG. The example of FIG. 8 differs from the example of FIG. 7 in that when the pump is not in operation in the determination of STEP 10, the processing of STEP 21 is executed instead of STEP 15 and the relief valve 32 is closed. Hereinafter, this point will be particularly described.

  In STEP 10, it is determined whether or not the pump is in operation. This determination is performed when the pump is not started in the determination of STEP 1 and when the pump is started, after the relief valve 32 is opened and the counting of the maximum acceleration time is completed. This is similar to the example of FIG. In addition, when the pump is in operation, the process proceeds to the flow switch determination in STEP 11 as in the example of FIG. On the other hand, in the illustrated example, when the pump is not operating in the determination of STEP 10, the small water amount detection time is set to 0 (STEP 20), and the relief valve 32 is closed (STEP 21). These processes are the same as when the flow switch 14 is not ON in the determination of STEP11.

  In the control according to the second example as described above, the amount of water discharged while the pump is stopped can be reduced by closing the relief valve 32 when the pump is not in operation. it can. For example, even when the vertical pump 1 is stopped, such as when the main water pressure is applied to the suction port 5 of the vertical pump 1 or when the water receiving tank is installed at a position higher than the pump, the relief pipe 31 is provided. Since the water in the vertical pump 1 is discharged through the control, the control as in the second example can be effective. In this case, since the impeller does not rotate while the pump is stopped, air tends to accumulate in the casing. However, when the pump is started, the relief valve 32 is opened and the air is discharged, so that the shaft seal portion can be dried. It can be eliminated quickly and heat generation of sliding parts such as bearings can be prevented.

  In the above two examples, the relief valve 32 is opened both when the vertical pump 1 is started and when the flow rate in the vertical pump 1 is a predetermined amount or less. In the case where the time of the state watching operation of 1 is short, the control for opening the relief valve 32 when the flow rate in the vertical pump 1 is equal to or less than the predetermined amount may be omitted.

  FIG. 9 is a schematic block diagram showing an example of the configuration of the control panel 2 in the water supply unit. The control panel 2 that is a control device in the water supply unit according to the present embodiment includes a setting unit 46, a storage unit 47, a calculation unit 48, a display device 49, an I / O unit 50, and an operation panel 51. The inverter, the flow switch, the pressure sensor, and the relief valve 32 are connected to the I / O unit 50 via a signal line. The setting unit 46 is input with various setting values related to the water supply device, such as maximum acceleration time, maximum deceleration time, state watching operation time, selection of whether or not to control the escape pipe, and the like, and includes a reset button 52 and a clear button 53. The setting unit 46 and the display device 49 are provided on the operation panel 51. The indicator 49 functions as a user interface, and displays the open / close state of the relief pipe, the open / close state of the flow switch, the pump operation / stop state, the count value of the small water amount detection time, the count value of the pump start time, and the like. The display unit 49 is a liquid crystal panel, and the setting unit 46 is an operation unit including various switches for operation input or a touch panel. Further, the display device 49 may be attached to the control panel 2, or the display device 49 may be arranged away from the control panel 2. Further, the display unit 49 may have a configuration in which a liquid crystal panel and a 7-segment LED or an indicator lamp are combined.

  FIG. 10 is a diagram showing another embodiment of the control panel 2 in the water supply unit. In the present embodiment, in addition to the display device 49, an external display device 61 is further provided. As shown in FIG. 10, the control panel 2 further includes a communication unit 60. The control panel 2 is connected to the external display 61 by wired communication or wireless communication. As the external display 61, for example, a general-purpose terminal device such as a smartphone, a mobile phone, a personal computer, a tablet, or a dedicated terminal device such as a remote monitor is adopted. In this embodiment, the display unit 49 is a simple display unit such as a 7-segment LED or a display lamp, and the external display unit 61 is a high-performance display unit using a liquid crystal screen and a touch input method or a push button method of the liquid crystal screen. is there. Since the amount of information that can be displayed by the external display 61 is much larger than that of the simple display 49, the external display 61 is released to open / close the pipe, open / close the flow switch, operate / stop the pump, and detect the small amount of water. By displaying the count value of the time, the count value of the pump start time, etc., users who are not familiar with the water supply unit will not misunderstand, the open / close state of the relief pipe, the open / close state of the flow switch, The count value of the water amount detection time, the count value of the pump start time, etc. can be recognized. Further, the water supply unit may be able to change various settings by the external display 61.

  The water supply unit may be installed in an electrically noisy environment such as a machine room or a pump room. According to the present embodiment, as the display unit 49 incorporated in the water supply unit, a display unit composed of a 7-segment LED, an indicator lamp, a mechanical push button, etc. that are more resistant to electrical noise than a liquid crystal display or a touch panel is used. Thus, even if an abnormality occurs in the liquid crystal display or touch panel operation of the external display 61 due to electrical noise generated from the external environment, the minimum display or operation necessary for the operation of the water supply unit is performed by the display 49. Therefore, the water supply unit can be installed in an environment with a lot of electrical noise. Furthermore, when a general-purpose terminal device such as a smart phone, a mobile phone, a personal computer, or a tablet is used as the external display 61, the user can use the dedicated application software to open and close the escape pipe, open and close the flow switch, Since it is possible to display the operation / stop state, the count value of the small water detection time, the count value of the pump start time, etc., open and close the escape pipe according to the user's level by preparing and using multiple dedicated application software It is possible to provide displays such as status, flow switch open / close status, pump operation / stop status, count value for small water amount detection time, count value for pump start time, and the like.

Here, the display device 49 is not provided in the control panel 2, and only the external display device (high function display device) 61 may be provided instead. Since there is no need to provide the display unit itself in the water supply unit, the cost of the entire water supply unit can be further reduced. Further, the control panel 2 does not include the clear button 53, and instead, the external display 61 may include a clear button (not shown). When the user presses the clear button on the external display 61, the open / close state of the relief pipe displayed on the external display 61, the open / close state of the flow switch, the pump operation / stop state, the count value of the small water amount detection time The display of the count value of the pump start time is deleted.

  In FIG. 10, the communication unit 60 is connected to a remote monitoring device (for example, a personal computer, a smartphone, a dedicated monitor) provided in a maintenance company or an administrator room via a public line, a network, a dedicated line, etc. Displays the open / close state of the relief pipe in the unit, the open / close state of the flow switch, the operation / stop state of the pump, the count value of the small water detection time, the count value of the pump start time, and the like. The remote monitoring device may also display other information.

  FIG. 11 is a view showing still another embodiment of the control panel 2 in the water supply unit. The basic configuration of the control panel 2 of the present embodiment is the same as the configuration of the control panel 2 of the embodiment shown in FIG. 9, but the control panel 2 includes a control panel side antenna unit 67 instead of the communication unit 60. And an integrated circuit 68 connected to the control panel side antenna unit 67 is different. The integrated circuit 68 is electrically connected to a storage unit 47 having a nonvolatile value storage area and a volatile storage area. In addition, although the control panel 2 of this embodiment is not provided with the display device 49, you may provide the display device 49 in the control panel 2. FIG. Further, the water supply unit may be able to change various settings by the external display unit 70.

  The external display unit 70 includes a display-side antenna unit 71 that transmits and receives radio waves, a data reader 74 that reads data received by the display-side antenna unit 71, and data that is read by the data reader 74 (for example, opening and closing of a relief pipe) State, flow switch open / close state, pump operation / stop state, small water amount detection time count value, pump start time count value, etc.), data reader 74, display side antenna unit 71, And a battery 73 for supplying power to the display unit 72. The external display device 70 may be a general-purpose terminal device such as a smartphone, a mobile phone, a personal computer, or a tablet, or may be a dedicated terminal device such as a remote monitor. In particular, if a general-purpose terminal device such as a smartphone is used as an external display, the cost of producing a dedicated display can be reduced, so that the cost of the water supply unit can be reduced. Also, multiple users can display the open / close status of the piping, the open / close status of the flow switch, the pump operation / stop status, the count value for the small water detection time, the count value for the pump start time, etc. Therefore, even for users who do not have expertise in water supply units, such as condominiums and building managers, the open / close state of the escape pipe, the open / close state of the flow switch, the operation / stop state of the pump, and the small water amount detection time A water supply unit that can inform the count value, the count value of the pump start time, and the like in an easy-to-understand manner can be provided at low cost.

  The external display device 70 is connected to the control panel 2 by a near field communication (NFC) technology. More specifically, when the display-side antenna unit 71 generates radio waves while the external display unit 70 is close to the control panel 2, the control panel-side antenna unit 67 receives the radio waves, and the control panel-side antenna unit 67. Converts radio waves into electric power. This electric power is supplied to the integrated circuit 68 and the storage unit 47 to drive the integrated circuit 68 and the storage unit 47. The integrated circuit 68 reads the data stored in the storage unit 47 and sends the data to the control panel side antenna unit 67. The control panel side antenna unit 67 transmits radio waves together with data to the display unit side antenna unit 71. The data reader 74 reads data received by the display-side antenna unit 71 and causes the display unit 72 to display the data.

The external indicator 70 is a clear button 66 for erasing the display of the open / close state of the relief pipe, the open / close state of the flow switch, the operation / stop state of the pump, the count value of the small water amount detection time, the count value of the pump start time, etc. It has. When the user presses the clear button 66,
The display of the open / close state of the relief pipe, the open / close state of the flow switch, the operation / stop state of the pump, the count value of the small water amount detection time, the count value of the pump start time, etc. displayed on the display unit 72 is erased. The clear button 66 of this embodiment is a virtual button that appears on the screen of the display unit 72, but the clear button 66 may be a mechanical button provided outside the display unit 72. Although the control panel 2 of this embodiment does not include a clear button, the control panel 2 may be provided with a clear button. Note that operation restrictions may be provided for these operations. Specifically, a clear button 66 is provided on the external display 70 used mainly by the user, and a reset button 52 is provided on the control panel 2 used mainly by maintenance personnel. By providing the reset button 52 only on the control panel 2 in this way, it is possible to prevent an erroneous operation of the reset button 52 by the user. By providing the external display 70 instead of a complicated method of canceling the use restriction such as a password, it is possible to prevent user's erroneous operation.

  In the present embodiment, wireless communication is performed between the external display 70 and the control panel 2, and the open / close state of the relief pipe, the open / close state of the flow switch, the operation / stop state of the pump stored in the storage unit 47, Data including the count value of the small water amount detection time, the count value of the pump start time, and the like is sent from the control panel 2 to the external display 70. According to this embodiment, even when the water supply unit is not turned on, the control panel side antenna unit 67 generates power from the radio wave emitted from the external display device 70 and drives the integrated circuit 68 and the storage unit 47. Can do. Therefore, even when power is not supplied to the control panel 2 during maintenance of the water supply unit, etc., the external display 70 is released from the storage unit 47 of the control panel 2 and the open / close state of the piping, the open / close state of the flow switch, Data including the operation / stop state, the count value of the small water amount detection time, the count value of the pump start time, and the like can be acquired and displayed.

  Near field communication (NFC) employed in the present embodiment is a technology that enables mutual communication only at a short distance of several centimeters. Therefore, in order to display the open / close state of the relief pipe, the open / close state of the flow switch, the pump operation / stop state, the count value of the small water amount detection time, the count value of the pump start time and other various information on the external display 70 The user or maintenance staff needs to bring the external display 70 close to the control panel 2. This means that when operating the external display 70, the user and maintenance personnel are near the water supply unit. Therefore, the user or the maintenance staff operates the external display unit 70 while viewing the water supply unit, which leads to preventing an unexpected operation of the water supply unit due to an erroneous operation. In addition, when multiple water supply units are installed, you want to display the open / close state of the relief pipe, the open / close state of the flow switch, the pump operation / stop state, the count value for the small water detection time, the count value for the pump start time, etc. Because communication is possible only at a short distance from the water supply unit, the unintended release pipe open / close state of the water supply unit, the open / close state of the flow switch, the pump operation / stop state, and the small water detection time It is possible to prevent erroneous display of displaying the count value, the count value of the pump start time, and the like.

  In said 1st and 2nd embodiment, although the water supply unit using a vertical pump was illustrated as a pump concerning the present invention, a pump concerning the present invention is not limited to such a vertical pump. The pump according to the present invention can be expected to have the same effect even when a horizontal pump or a single-stage pump with one impeller is used. In the case of a horizontal pump, the relief pipe is provided at the top of the casing. Furthermore, the number of pumps in the water supply unit is not limited to three, but may be one, two, or a plurality of more than three.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the technical scope of the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present invention can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that it belongs to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Vertical pump 2 Control panel 14 Flow switch 22 Individual piping 23 Collective piping 24 Check valve 26,32 Relief valve 31 Relief piping 46 Setting part 47 Memory | storage part 48 Calculation part 49 Display 50 I / O part 51 Operation panel 52 Reset Button 53 Clear button 60 Communication unit 61, 70 External display 67 Control panel side antenna unit 68 Integrated circuit 71 Display unit side antenna unit 72 Display unit 73 Battery 74 Data reader

Claims (18)

A pump,
A relief pipe connected to the pump;
A relief valve installed in the relief pipe;
And a control unit that performs control to open the relief valve when a predetermined condition relating to the operation state of the pump is satisfied. The pump includes a plurality of pumps,
The relief pipe includes a plurality of individual pipes connected to each of the plurality of pumps, and a collective pipe where the plurality of individual pipes merge.
The pump unit according to claim 1, wherein the relief valve is installed in the collecting pipe.   The pump unit according to claim 2, wherein the predetermined condition includes starting one of the plurality of pumps.   The pump unit according to claim 3, wherein the predetermined condition includes stopping all of the plurality of pumps.   The pump unit according to any one of claims 2 to 4, wherein the predetermined condition includes that a flow rate in any of the plurality of pumps is equal to or less than a predetermined amount. The pump includes a plurality of pumps,
The relief pipe includes a plurality of individual pipes connected to each of the plurality of pumps,
The pump unit according to claim 1, wherein the relief valve includes a relief valve installed in each of the plurality of individual pipes.   The pump unit according to claim 6, wherein the control device individually controls a relief valve installed in each of the plurality of individual pipes.   The pump unit according to claim 7, wherein the predetermined condition includes starting the pump to which an individual pipe in which the relief valve is installed is connected.   The pump unit according to claim 8, wherein the predetermined condition includes stopping the pump to which an individual pipe in which the relief valve is installed is connected.   The pump unit according to any one of claims 7 to 9, wherein the predetermined condition includes that a flow rate in the pump to which an individual pipe in which the relief valve is installed is connected is equal to or less than a predetermined amount.   The control device maintains the relief valve open for a first time when the pump is started regardless of a target rotational speed of the pump to be started. The pump unit according to any one of the above.   The pump unit according to claim 11, wherein the first time is a maximum acceleration time of the pump. The pump unit according to claim 5 or 10, wherein the control device performs control to open the relief valve when a state in which the flow rate in the pump is equal to or less than a predetermined amount continues for a second time.   The pump unit according to claim 13, wherein the second time is a maximum deceleration time of the pump.   The control device includes: an open / close state of the relief valve; an open / close state of a flow switch provided in the pump unit; an operation state or a stop state of the pump; a detection time when the flow rate in the pump is equal to or less than a predetermined amount; The pump unit of any one of Claims 1-14 including the display part which displays the information regarding.   The control device includes: an open / close state of the relief valve; an open / close state of a flow switch included in the pump unit; an operation state or a stop state of the pump; a detection time when the flow rate in the pump is equal to or less than a predetermined amount; The pump unit according to any one of claims 1 to 15, further comprising a communication unit that transmits information related to time to an external display.   The pump unit according to claim 16, wherein the communication unit is a control device side antenna unit that receives radio waves from the external display and converts the radio waves into electric power.   The pump unit according to claim 17, wherein the communication unit communicates with the external display by near field communication (NFC).

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