JP2017214899A - Pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a drainage water amount on relief piping to a minimum amount while preventing overheat of a pump in a small water amount operation.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 or close depending on temperature of internal fluid of the pump. The pump is stopped when the temperature rises to a first threshold. The control device controls the relief valve to open when the temperature rises to a second threshold that is lower than the first threshold.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pump unit.

  In a water supply device that supplies water to a building such as a building or a condominium, there is a case where a certain amount of water is always discharged outside the pump by providing a relief pipe in order to prevent the pump from becoming hot and causing a failure. In many cases, the water discharged from the escape pipe to the outside of the pump is returned to the water receiving tank and reused due to the large amount of water (for example, several tens of liters per pump). However, there are cases where it is prohibited to return the water that has passed through the pump to the receiving tank from the viewpoint of water source contamination. In such a case, all the water discharged to the outside of the pump through the escape pipe becomes waste water. In the case of a relief pipe for the purpose of preventing overheating as described above, when the pump is operating normally at a certain flow rate, there is no possibility that the water in the pump will overheat, so water is always discharged from the relief pipe. It is useless to do.

  Therefore, it has been proposed to control the opening and closing of the escape pipe according to the water temperature. For example, in Patent Document 1, a flow path opening / closing device using a shape memory alloy is provided in a relief pipe, and when the fluid temperature in the relief pipe exceeds a predetermined value, the flow path opening / closing apparatus opens the relief pipe, In other cases, a technique is described in which the flow path opening / closing device is configured to close the escape pipe. According to Patent Document 1, such a configuration is advantageous in that it is simpler and cheaper than that using a temperature sensor or the like, and no explosion-proof measures are required.

JP-A-4-50497

  However, with the technique described in Patent Document 1 described above, it is difficult to adjust the temperature setting value for opening the escape pipe after the water supply device is installed. The water supply device may be installed in a place exposed to direct sunlight outdoors, for example. In such a place, it is necessary to make an adjustment to increase the temperature setting value for opening the escape pipe after installation.

  Moreover, in the technique described in said patent document 1, stopping a pump is not considered. For example, in a water supply apparatus that supplies water to a building or an apartment, the pump is stopped by detecting a small amount of water when the user does not use water. Recently, there is a high demand for energy saving, and when a small amount of water is detected, the pump is stopped immediately (previously, the operation was conducted while watching), so a small amount of water stopped and restarted frequently (for example, several times / day). Yes.

  In the above case, since the valve is naturally cooled when the pump is stopped, the valve once opened is closed. Therefore, in the flow path opening / closing device described in Patent Document 1, the number of opening and closing of the valve exceeds the upper limit. Failure may occur. In addition, the flow path opening and closing device using shape memory alloy due to heat takes a long time to change its shape, and it may be impossible to prevent overheating of the pump due to delay in opening the escape pipe, and the temperature and shape of the water in the pump When the reaction temperature of the memory alloy is close, opening and closing are repeated and mechanical failure may occur.

Further, in Patent Document 1, no consideration is given to the protection of the pump when the flow path opening / closing device fails. Specifically, if the flow path opening / closing device breaks down and closes the piping,
Even if the shut-off operation is continued, it is not possible to discharge water from the escape pipe and suppress an increase in the temperature of the water in the pump, which may lead to failure of the pump due to overheating and further water cut-off.

  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 minimizing the amount of drainage in the escape pipe while preventing the pump from overheating when the pump is operated with a small amount of water.

  According to an aspect of the present invention, there is provided a pump, a relief pipe connected to the pump, a relief valve installed in the relief pipe, and a control device that controls opening and closing of the relief valve according to the temperature of the fluid in the pump. A pump unit is provided, wherein the pump is stopped when the temperature rises to a first threshold and the controller opens a relief valve when the temperature rises to a second threshold lower than the first threshold Is done.

  In the above configuration, by controlling the opening and closing of the relief valve according to the temperature of the fluid in the pump, it is possible to minimize the amount of drainage in the escape pipe while preventing the pump from overheating during the small water flow operation of the pump. Become.

  The controller may close the relief valve when the temperature falls to a fourth threshold that is lower than the second threshold.

  The pump can be restarted when the temperature drops to the third threshold after being stopped by the temperature rising to the first threshold, the third threshold being the first threshold and the second threshold It may be between. In this case, the control device may close the relief valve when the pump can be restarted.

  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 relief valve includes a relief valve installed in each of the plurality of individual pipes, and the control device includes: The relief valve installed in each of the plurality of individual pipes may be individually controlled, and the relief valve installed in the individual pipe connected to the pump stopped when the temperature reaches the first threshold may be closed. .

  The first to fourth threshold values may be changeable.

  The control device may include a display unit that displays information on an open / close state of the relief valve or the temperature.

  The control device may include a communication unit that transmits information related to the open / close state of the relief valve or the temperature to the 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 figure which shows typically about control of the solenoid valve in the 1st 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. 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.

  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 shaft sealing portion (not shown) disposed above the impeller, and a casing (not shown) that accommodates these impellers and shaft sealing portions. And a motor 7 that rotationally drives the impeller. 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.

  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 mode. In the automatic 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 and water is supplied. When all the faucets are closed), the vertical pump 1 stops 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. And based on the detected value (water 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 this embodiment, the relief pipe includes 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. 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, globe 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 temperature of the vertical pump 1 measured by the temperature sensor 20 as in the example described below. As the relief valve 26, a flow path switch that can be opened and closed 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.

  It is most effective to attach the temperature sensor 20 to a portion where the water temperature rises most during the deadline operation or the small water amount operation. At the time of deadline operation or small amount of water operation, the rotational energy of the impeller is converted into thermal energy and the water temperature rises. Therefore, the portion of the vertical pump 1 where the water temperature rises the most is near the final stage of the impeller and becomes the upper part of the casing . The temperature sensor 20 may be embedded in the vicinity of the uppermost impeller, or may be attached to the outer surface of the casing. By attaching the temperature sensor 20 to the outside of the casing, the temperature sensor 20 can be attached or removed without disassembling the pump, improving maintainability, and making the temperature sensor 20 non-waterproof. There is an effect that the signal line can be easily wired to the control panel 2 of the temperature sensor 20. Further, as described above, in the casing of the vertical pump 1, the shaft seal portion is provided at the upper portion of the impeller. Since the shaft seal slides, it tends to generate heat. By attaching the temperature sensor 20 above the impeller of the vertical pump 1, it is possible to more accurately detect the heat generation of the shaft seal portion, so that the relief valve 26 can be controlled more effectively.

  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 flow path switch 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 temperature of the vertical pump 1, so that water is wasted but the vertical pump 1 is hot. Then, the vertical pump 1 can be prevented from becoming inoperable and water supply can be continued.

FIG. 2 is a diagram schematically showing the control of the relief valve 26 in the first embodiment of the present invention. In the illustrated example, the control panel 2 is in use of water at a demand destination when the temperature T of the pump being operated for the deadline operation, for example, rises to the first threshold T1 (60 ° C.). Even if it exists, the corresponding vertical pump 1 is stopped. On the other hand, the control panel 2 opens the relief valve 26 when the temperature T rises to the second threshold T2 (50 ° C.) lower than the first threshold T1. In the figure, the temperature change between when the temperature T decreases due to opening of the relief valve 26 (solid line) and when the temperature T further increases (broken line) is schematically shown along the time t. . In the following description, “opening the relief valve 26” means that the relief valve 26 is opened when the relief valve 26 is closed, and the state is maintained when the relief valve 26 is already opened. It means to do. Similarly, “closing the relief valve 26” means closing the relief valve 26 when the relief valve 26 is open, and maintaining the state when the relief valve 26 is already closed. To do.

  Here, if the vertical pump 1 is continuously operated at a high temperature, the casing may be thermally deformed, or contacted and rotated at a sliding portion such as a shaft seal portion, for example, and may be damaged. The first threshold value T1 is a temperature at which the vertical pump 1 may break down when operated for a long time at the first threshold value T1. Moreover, the water supply unit of this embodiment is a tap water, well water, industrial water etc. as a conveyance liquid, and the water temperature Tw of the conveyance liquid before passing the vertical pump 1 is about 0 degreeC-40 degreeC. During operation of the vertical pump 1, the shaft power is changed to heat in the casing, so that the water temperature of the carrier liquid in the vertical pump 1 rises. Therefore, the second threshold T2 is set to a temperature higher than the water temperature Tw of the transport liquid.

  In the example shown by the solid line in FIG. 2, when a certain amount of water is used at the demand destination, the vertical pump 1 is cooled by the carrier liquid, so the temperature T is equal to or lower than the threshold T2. Therefore, the control panel 2 operates all or a part of the three vertical pumps 1 with the relief valve 26 closed. For example, when only a small amount of water is used at a customer, a small water amount operation (including a deadline operation) is performed. In the case of the small water amount operation, the carrier liquid stays in the vertical pump 1 for a long time, the water temperature of the carrier liquid rises, and the temperature T of the vertical pump 1 rises. When the temperature T rises to the second threshold T2 (50 ° C.) with any of the vertical pumps 1, the control panel 2 opens the relief valve 26. In the case of a small amount of water operation, the high temperature carrier liquid that has stagnated from the escape pipe is discharged, and instead the carrier liquid having a water temperature of Tw enters the vertical pump 1 through the suction port 5, whereby the temperature T decreases. In that case, the control panel 2 may close the relief valve 26 when the temperature T decreases to the fourth threshold value T4 (45 ° C.) in all the vertical pumps 1. The fourth threshold T4 is lower than the second threshold T2 and is equal to or higher than the water temperature Tw of the transport liquid.

  Further, as described above, in the water supply unit of the present embodiment, in the case of the small water amount operation in which only a small amount of water is used at the demand destination, the flow switch 14 detects the small water amount. When the flow switch 14 continues to detect a small amount of water for an arbitrary time, the relief valve 26 may be opened as a small amount of water operation regardless of the detected value of the temperature T. In this case, the relief valve 26 may be closed when the flow switch 14 does not detect a small amount of water and the temperature T is equal to or lower than the fourth threshold T4 (45 ° C.). If it carries out like this, it can prevent that temperature T raises by a small amount of water driving | operation. In addition, even when the temperature sensor 20 fails, the relief valve 26 can be opened during the small water amount operation, so that the temperature T can be lowered as shown by the solid line in FIG.

  On the other hand, for example, when the impeller of the vertical pump 1 is locked due to foreign matter being caught or the like, an overcurrent is generated in the motor 7 and becomes high temperature, and the heat is transmitted to the pump 1 and the temperature T rises. In this case, as shown by the broken line in FIG. 2, the temperature T continues to rise even when the relief valve 26 is opened. The control panel 2 forcibly stops the vertical pump 1 when the temperature T rises to the first threshold T1 (60 ° C.) in any of the vertical pumps 1. If the discharge pressure drops due to the vertical pump 1 being stopped, the other vertical pump 1 that can be started is started (pump rotation) to continue water supply. If 1 does not exist, turn off the water. Thereafter, when the temperature T of the corresponding vertical pump 1 decreases to the third threshold T3 (55 ° C.), the corresponding vertical pump 1 can be restarted.

Note that the control panel 2 may output an overheat alarm of the corresponding pump when the temperature T of the vertical pump 1 rises to the first threshold T1 (60 ° C.). Furthermore, since there is a possibility that the foreign matter is caught by stopping the corresponding pump and it can be operated normally, retry may be performed a plurality of times before the pump overheat alarm is output. Specifically, the control panel 2 cannot operate until the temperature T rises to the first threshold T1 (60 ° C.), stops the corresponding pump, and the temperature T falls to the third threshold T3 (55 ° C.). To do. If the temperature T rises to the first threshold value T1 (60 ° C.) while the vertical pump 1 is operating again, the alarm may be output to the operator as a pump overheat alarm.

  That is, in this embodiment, the relief valve 26 is opened when the temperature T rises to the second threshold T2 (50 ° C.) lower than the first threshold T1 (60 ° C.), and water is discharged from the relief pipe. By continuing the operation of the vertical pump 1, there is a high possibility that the vertical pump 1 can be cooled with the carrier liquid and the temperature T can be effectively reduced. Thereby, it is possible to avoid overheating of the pump due to the small water amount operation, and further to stop the pump while using water at the supply destination. This avoids pressure fluctuations and water shutoff due to unintended pump rotation while using water at the customer.

  Here, as described above, the timing at which the vertical pump 1 is restarted in the automatic mode is when the use of water is confirmed at the demand destination, and the vertical pump 1 is started to drain from the escape pipe. There is a possibility that the temperature T can be lowered at least. Therefore, when the temperature T reaches the second threshold value T2 (50 ° C.), the control panel 2 opens the relief valve 26, but the temperature T rises to the first threshold value T1 (60 ° C.). After the vertical pump 1 is stopped, the relief valve 26 may be closed when the temperature T falls to the third threshold T3 (55 ° C.) and the vertical pump 1 can be restarted. Alternatively, the control panel 2 raises the temperature T to the first threshold value T1 (60 ° C.) at any of the vertical pumps 1 and stops the corresponding vertical pump 1 at this point, If there is no shape pump 1, the relief valve 26 may be closed. For example, when the water main pressure is applied to the suction port 5 of the vertical pump 1, the water in the vertical pump 1 is discharged through the escape pipe even when the vertical pump 1 is stopped. Therefore, if all the vertical pumps 1 are stopped, it is effective to close the relief valve 26 in order to save water.

  FIG. 3 is a schematic block diagram 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, the temperature sensor 20, and the relief valve 26 are connected to the I / O unit 50 via a signal line. Various setting values relating to operation control of the water supply unit are input to the setting unit 46, 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 display 49 functions as a user interface, and displays the open / close state of the relief valve 26, the temperature of the vertical pump 1 measured by the temperature sensor 20, the operating status (operation information) of the vertical pump 1, an alarm, 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. 4 is a view 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. 4, 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 external display 61 has a much larger amount of information that can be displayed than the simple display 49, the external display 61 indicates the open / close state of the relief valve 26 or the temperature of the vertical pump 1 measured by the temperature sensor 20. By displaying, the user unfamiliar with the water supply unit can recognize the open / close state of the relief valve 26 or the temperature of the vertical pump 1 measured by the temperature sensor 20 without misunderstanding. The water supply unit is an external display 6
1 may be changed.

  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. Further, when a general-purpose terminal device such as a smartphone, a mobile phone, a personal computer, or a tablet is used as the external display 61, the user can measure the open / close state of the relief valve 26 or the temperature sensor 20 using dedicated application software. Since the temperature of the vertical pump 1 can be displayed, a plurality of dedicated application software is prepared and used properly, and the open / close state of the relief valve 26 according to the user level or the vertical type measured by the temperature sensor 20 is used. An indication of the temperature of the pump 1 can be provided.

  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 valve 26 displayed on the external display 61 or the temperature display of the vertical pump 1 measured by the temperature sensor 20 is erased. The

  In FIG. 4, the communication unit 60 is connected to a remote monitoring device (for example, a personal computer, a smartphone, or a dedicated monitor) provided in a maintenance management company or an administrator room via a public line, a network, a dedicated line, etc. The open / close state of the relief valve 26 in the unit or the temperature of the vertical pump 1 measured by the temperature sensor 20 is displayed. The remote monitoring device may also display other information such as failure information and operation information of the water supply unit and the vertical pump 1.

  FIG. 5 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. 3, 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 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, the relief valve 26). Display section 72 for displaying the open / close state, temperature of vertical pump 1 measured by temperature sensor 20, operating state of vertical pump 1, discharge pressure, and the like, data reader 74, display-side antenna section 71, and display And a battery 73 for supplying power to the 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. In addition, since a plurality of users can display the open / close state of the relief valve 26 or the temperature of the vertical pump 1 measured by the temperature sensor 20 on each general-purpose terminal device, such as an apartment or building manager Even for users who have no expertise regarding the water supply unit, the operation information of the vertical pump 1, the open / close state of the relief valve 26, and the temperature of the vertical pump 1 measured by the temperature sensor 20 can be easily understood. A water supply unit 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 includes a clear button 66 for erasing the indication of the open / close state of the relief valve 26 or the temperature of the vertical pump 1 measured by the temperature sensor 20. When the user presses the clear button 66, the display of the open / close state of the relief valve 26 displayed on the display unit 72 or the temperature of the vertical pump 1 measured by the temperature sensor 20 is deleted. 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 indicator 70 and the control panel 2, and the open / close state of the relief valve 26 stored in the storage unit 47 or the vertical pump 1 measured by the temperature sensor 20. Data including the temperature 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 or the like, the external indicator 70 is measured by the open / close state of the relief valve 26 from the storage unit 47 of the control panel 2 or by the temperature sensor 20. Data including the temperature of the vertical pump 1 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 valve 26 or the temperature of the vertical pump 1 measured by the temperature sensor 20 and other various information on the external display 70, the user or maintenance personnel can use the external display 70. It is necessary to approach 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, at a site where a plurality of water supply units are installed, communication is possible only at a short distance of the water supply unit that wants to display the open / close state of the relief valve 26 or the temperature of the vertical pump 1 measured by the temperature sensor 20. Open / close state of the relief valve 26 of another unintended water supply unit, which is often used in wireless communication,
Or the erroneous display of displaying the temperature of the vertical pump 1 measured by the temperature sensor 20 can be prevented.

  In the present embodiment, the first threshold value T1, the second threshold value T2, the third threshold value T3, and the fourth threshold value T4 in the control of the relief valve 26 are displayed on the operation panel 51, the external display 61, and the external display unit 70. May be changed. For example, when the water supply unit is installed on the secondary side of the water heater, since the temperature Tw of the water sucked into the vertical pump 1 is already high, the difference between the second threshold T2 (50 ° C.) and the temperature of this water In such a case, the time during which the relief valve 26 is opened becomes long. In such a case, the second threshold value T2 can be changed using the operation panel 51, and the temperature can be increased. Note that the temperature T threshold in the above example (the first threshold T1 is 60 ° C., the second threshold T2 is 50 ° C., the third threshold T3 is 55 ° C., and the fourth threshold T4 is 45 ° C.) is an example. Only. For example, the initial setting values of the respective threshold values may be different from these values, and these values may be arbitrarily changed using the operation panel 51 as described above.

  In addition, in order to test whether the relief valve 26 operates normally, it is possible to command the opening and closing of the relief valve 26 from the setting unit 46 and / or the external display 61 and / or the external indicator 70. May be displayed on the operation panel 51 and / or the external display 61 and / or the external display 70. Furthermore, during the test operation using the operation panel 51 and / or the external display 61 and / or the external display 70, the control of the relief valve 26 based on the threshold value of the temperature T can be stopped.

  In the control of the relief valve 26 in the present embodiment as described above, the control panel 2 has a threshold (second threshold) lower than the threshold (first threshold T1) of the temperature T of the water at which the vertical pump 1 is stopped. The relief valve 26 is opened at the threshold value T2). By opening the relief valve 26 before the vertical pump 1 is stopped, the temperature T is lowered by the liquid temperature of the carrier liquid, and the operation can be continued. When the temperature T decreases to a lower threshold (fourth threshold T4), the relief valve 26 is closed. By such control, it is possible to minimize the amount of drainage in the escape pipe while preventing overheating when the vertical pump 1 is operated with a small amount of water.

  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, 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, and the pump The automatic operation mode that is the operation control method is the same as that of the first embodiment described with reference to FIGS. 1A and 1B, and the control panel (control device) 2 is illustrated with reference to FIGS. Since it is the same as that of embodiment described, 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 described below, the control panel 2 individually controls the opening and closing of the relief valves 32 according to the temperature T of the water in each vertical pump 1 measured by the temperature sensor 20.

Here, as in the first embodiment, when the relief valve 32 cannot be controlled due to a failure of the control panel 2 or the like, the relief valve 32 is closed when energized so that the relief valve 32 is always drained. It is preferable to use a road switch. When the signal line from the control panel 2 breaks down due to disconnection or the like, the relief valve 32 is opened regardless of the temperature of the vertical pump 1, so that water is wasted but the vertical pump 1 is hot. Then, the vertical pump 1 can be prevented from becoming inoperable and water supply can be continued.

  As already described, in this embodiment, the relief pipes 31 are connected to the vertical pumps 1, and the control panel 2 individually controls the relief valves 32 installed in the relief pipes 31. Accordingly, in the present embodiment, the control of the relief valve 32 similar to that in the first embodiment is performed independently for each relief valve 32. That is, the control panel 2 individually manages the temperature T of the water in each vertical pump 1, and opens or closes the relief valve 32 when each temperature T reaches the first to fourth thresholds T1 to T4, or Control of stopping or restarting the vertical pump 1 is executed. Similarly to the first embodiment, the first to fourth threshold values T1 to T4 may be changeable on the operation panel provided in the control panel 2.

  In the present embodiment, the control panel 2 determines that the temperature T is equal to the first threshold T1 (for example, 60 ° C.) even though the relief valve 32 is opened when the temperature T reaches the second threshold T2 (for example, 50 ° C.). ), The vertical pump 1 may be stopped and the relief valve 32 may be closed. Unlike the first embodiment, the opening and closing of the relief valve 32 installed in one vertical pump 1 does not affect another vertical pump 1. Therefore, for example, when water mains pressure is applied to the suction port 5 of the vertical pump 1, the control panel 2 saves water when the vertical pump 1 with the controlled relief valve 32 is stopped. Therefore, the relief valve 32 can be closed.

  In the first and second embodiments, the water supply unit using the vertical pump is exemplified as the pump according to the present invention. However, the pump according to 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. Further, the position of the temperature sensor is not limited to the upper part of the casing, and may be installed at a position where the temperature rise of the heat generating component can be detected. As an example, you may attach to a piping part. The escape pipe may be installed at a position where the pump is effectively cooled by draining. By making it possible to change the first to fourth threshold values T1 to T4, it is possible to perform optimal relief valve control regardless of the shape of the pump, the position of the temperature sensor, and the installation environment of the water supply device. . Furthermore, the number of pumps in the water supply unit is not limited to three, and may be one or more.

  In addition, in said 1st and 2nd embodiment, although the water supply unit was illustrated as a pump unit which concerns on this invention, the pump unit which concerns on this invention is not limited to such a water supply unit. The pump unit according to the present invention also includes a fire extinguishing pump unit, for example. In the automatic operation of the water supply unit, the pump is started by using water on the demand side, and the pump is stopped when the amount of water is small. After starting the pump, the pump operation is continued until the fire extinguishing operation is completely completed and the stop button on the operation panel is pressed without limiting the amount of water. However, there is a possibility that the pump may be overheated due to a small amount of water operation or a shut-off operation when the pump is started due to an erroneous detection or operation of a fire, or when the fire is completed and the valve is closed. Similarly, the pump unit according to the present invention is not limited to the illustrated water supply unit and fire extinguishing pump unit, and may include any type of pump unit that may cause overheating of the pump due to a small water amount operation or a shut-off operation.

  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 (10)

A pump,
A relief pipe connected to the pump;
A relief valve installed in the relief pipe;
A control device that controls the opening and closing of the relief valve according to the temperature of the fluid in the pump,
The pump is stopped when the temperature rises to a first threshold;
The controller opens the relief valve when the temperature rises to a second threshold lower than the first threshold;
Pumping unit.   The pump unit according to claim 1, wherein the controller closes the relief valve when the temperature falls to a fourth threshold value lower than the second threshold value. The pump can be restarted when the temperature drops to a third threshold after being stopped by the temperature rising to the first threshold,
The pump unit according to claim 1 or 2, wherein the third threshold value is between the first threshold value and the second threshold value.   4. The pump unit according to claim 3, wherein the control device closes the relief valve when the pump can be restarted. 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 relief valve includes a relief valve installed in each of the plurality of individual pipes,
The control device individually controls a relief valve installed in each of the plurality of individual pipes, and is installed in the individual pipes connected to the pump stopped when the temperature reaches the first threshold value. The pump unit according to claim 1, wherein the relief valve is closed.   The pump unit according to any one of claims 1 to 5, wherein the first to fourth threshold values are changeable.   The said control apparatus is a pump unit of any one of Claims 1-6 containing the display part which displays the information regarding the opening-and-closing state of the said relief valve or / and the said temperature.   The pump unit according to any one of claims 1 to 7, wherein the control device includes a communication unit that transmits information about an open / close state of the relief valve and / or the temperature to an external display.   The pump unit according to claim 8, 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 9, wherein the communication unit communicates with the external display by near field communication (NFC).

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