JP6695466B1 - Water supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply device which prevents deterioration of pump performance while preventing high temperature water from accumulating in the pump. A water supply device (1) includes a pump device (10) having a pump (13) and a motor (11) for driving the pump (13), and a flow rate sensor that is provided on a secondary side of the pump (13) and outputs a signal according to a discharge flow rate of the pump (13). 140, the drive time from the start of the pump device 10 is measured, the stop flow rate is increased with respect to the initial value according to the increase of the drive time, and the stop flow rate is detected based on the output from the flow rate sensor 140. And a control unit 163 that stops driving the device 10. [Selection diagram]

Description

  The present invention relates to a water supply device that supplies water to a water supply destination.

  As a control of a water supply device that supplies water to a water supply destination of a building such as an apartment house, a technique is known in which a pump is stopped when a stop flow rate is detected, and a pump is driven when a starting pressure is detected. This type of water supply device has a configuration in which the pressure of water is increased by rotating the impeller, and therefore, the temperature of the water in the pump is increased by consuming part of the shaft power of the pump as power for stirring the water. To rise.

  For this reason, when operating with a small amount of water near the stop flow rate, the moving effect of the temperature of the water in the pump due to the water flow is reduced, so that high temperature water stays in the pump, and as a result, the mechanical seal and other shaft seal parts are blocked. If the sliding parts are excessively worn, the life of the shaft sealing part may be shortened.

  As a technique to prevent the temperature of the water inside the pump from rising excessively, the temperature of the water inside the pump can be controlled by providing a relief pipe in the pump and returning the water from this relief pipe to the receiving tank or by draining it. A technique for preventing an excessive rise is known (for example, see Patent Document 1).

JP, 2017-214898, A

  However, a pump having such an escape pipe causes a drop in pump performance by returning the water in the pump to the water receiving tank by the escape pipe or by draining the water in the pump by the escape pipe. I was afraid.

  Therefore, an object of the present invention is to provide a water supply device that prevents deterioration of pump performance while preventing high temperature water from staying in the pump.

A water supply device according to an embodiment of the present invention is provided with a pump device having a pump and a motor for driving the pump and a primary side or a secondary side of the pump, and outputs a signal according to a discharge flow rate of the pump. To measure the drive time from the start of the pump device, increase the stop flow rate with respect to the initial value in accordance with the increase of the drive time, the stop flow rate based on the output from the flow sensor. And a controller that stops driving the pump device when detected. A storage unit that stores a plurality of the stop flow rates including the initial value and a threshold value that selects one of the stop flow rates according to the drive time of the pump device is provided, and the control unit includes the drive unit. One of the plurality of stop flow rates is selected based on time and the threshold value.

  According to the present invention, it is possible to provide a water supply device that can prevent deterioration of pump performance while preventing high temperature water from staying in the pump.

The front view which shows the structure of the water supply apparatus which concerns on one Embodiment of this invention. The side view which shows the structure of the water supply apparatus in a partial cross section. The top view which shows the structure of the same water supply apparatus. Sectional drawing which shows the structure of the pump used for the same water supply apparatus. Sectional drawing which shows the structure of the flow sensor used for the same water supply apparatus. The graph explaining the temperature of the water in the same pump. The graph explaining the temperature of the water in the same pump. A performance curve showing the performance of the pump.

  Hereinafter, a water supply device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 is a front view showing the configuration of the water supply device 1. FIG. 2 is a side view showing the configuration of the water supply device 1 in a partial cross section. FIG. 3 is a plan view showing the configuration of the water supply device 1. FIG. 4 is a cross-sectional view showing the configuration of the pump 13 used in the water supply device 1. FIG. 5 is a cross-sectional view showing the configuration of the flow sensor 140 of the water supply device 1. 6 and 7 are graphs showing the temperature of water in the upper cover 35 of the pump 13 used in the water supply device 1. FIG. 8 is a graph showing the performance of the pump device 10.

  As shown in FIGS. 1 and 2, the water supply device 1 includes a plurality of pump devices 10, a plurality of discharge pipes 80 connected to the secondary side of each pump device 10, and a plurality of discharge pipes provided in each discharge pipe 80. Check valve 90, a plurality of on-off valves 100 provided in each discharge pipe 80, a connecting pipe 110 connecting the plurality of discharge pipes 80, a connecting pipe 120 provided in the connecting pipe 110, and a connecting pipe 120. The plurality of pressure accumulators 130, the plurality of flow rate sensors 140 that detect the flow rate on the secondary side of each pump device 10, the pressure sensor 150 that detects the pressure in the connecting pipe 110, and the operation of each pump device 10. And a control device 160 for controlling.

  The water supply device 1 increases the pressure of water from the water source by the pump device 10 and supplies the water to the water supply destination via the discharge pipe 80 and the connection pipe 110. The water supply destination is, for example, a water tap installed in each house of an apartment house, and is a terminal device such as a faucet or a shower head. The connecting pipe 110 is connected to a pipe connected to a water tap provided in a building or the like.

  As shown in FIGS. 1, 2, and 4, the pump device 10 includes a motor 11, a main shaft 12, and a pump 13. The pump device 10 has a primary side connected to a water source such as a water pipe or a water tank. The pump device 10 is a so-called vertical multi-stage turbine pump in which a rotating shaft extends along the direction of gravity and a motor 11 is arranged above the pump 13. For example, three pump devices 10 are provided.

  The motor 11 includes a motor casing 11a, a stator provided in the motor casing 11a, and a rotor rotated by the stator.

  The main shaft 12 is configured to be rotatable by a motor 11. The main shaft 12 is extended in the gravity direction so that a plurality of impellers provided on the pump 13 can be fixed. The main shaft 12 includes, for example, a motor main shaft 21, a pump main shaft 22, a shaft coupling 23, and a mechanical seal 23a.

  The motor main shaft 21 is fixed to the rotor. The motor main shaft 21 rotates as the rotor rotates. The motor main shaft 21 is supported by bearings inside the motor casing.

  The pump main shaft 22 is arranged in the pump 13. The pump main shaft 22 is formed so that a plurality of impellers 42 and 52 provided in the pump 13 can be fixed. Further, the pump main shaft 22 has a sleeve 22a that comes into contact with the impeller boss portion 42c of the fixed uppermost impeller 42 and the impeller boss portion 52c of the lowermost impeller 52, which will be described later.

The shaft coupling 23 connects the motor main shaft 21 and the pump main shaft 22 so that the pump main shaft 22 can rotate as the motor main shaft 21 rotates.
The mechanical seal 23a seals a gap between the main shaft 12 and an upper cover 35 described later.

  The pump 13 includes a flow passage cover 31 that forms a suction port 31a and a discharge port 31b, a first pump group 32A that includes one or more first pumps 32 that forms an upward flow, and a first pump group 32A. A second pump group 33A, which is arranged above the pump group 32A and forms a downward flow, includes one or more second pumps 33, a flow passage casing 34, and above the second pump group 33A. And an upper cover 35 disposed on the.

  The suction port 31a of the flow path cover 31 forms a flow path to the lowermost first pump 32. The discharge port 31b of the flow path cover 31 is cut off from the flow path by the first pump 32 at the lowermost stage.

  In the first pump group 32A and the second pump group 33A, the stored impellers 42 and 52 are arranged in opposite directions, so that the pumping directions of water are set to be opposite to each other in the axial direction. That is, the water flow direction of the first pump group 32A is set upward, and the water flow direction of the second pump group 33A is set downward.

  The first pump group 32A is configured by stacking a plurality of first pumps 32, for example. The first pump 32 pumps up the water sucked from below. The first pump 32 includes a first pump casing 41 and a first impeller 42 fixed to the pump main shaft 22 and housed in the first pump casing 41.

  The first pump casing 41 includes, for example, a circular discharge port 41a, a storage portion 41b that stores the first impeller 42 therein, and an outer peripheral side of the first pump casing 41 to a center side of the storage portion 41b. A return passage 41c that is formed toward the outlet and communicates with the discharge port 41a, and a guide blade 41d that is disposed in the storage portion 41b of the first pump casing 41 that is connected to the primary side.

  The return flow passage 41c forms a flow of water that is continuous with the storage portion 41b of the secondary side first pump casing 41 via the discharge port 41a.

  The first pump casing 41 is formed so as to be connectable to the vertically adjacent first pump casing 41, the flow passage cover 31, and the flow passage casing 34. The first pump casing 41, the flow passage cover 31, and the flow passage casing 34 are integrally fixed by a fastening member such as a bolt. A space between the first pump casing 41, the flow passage cover 31 and the flow passage casing 34 is sealed by a seal member such as an O-ring so as to prevent water inside from leaking.

  Further, the first pump casing 41 includes an opening that is separated from the first impeller 42 by a predetermined gap, and an opening in which the pump main shaft 22 and the main bearing are arranged, and faces the first impeller 42. A liner ring 41e is provided on the inner peripheral edge of the opening.

  The first pump casing 41 as described above is configured by, for example, integrally combining a plurality of members, and by stacking the plurality of members, the first pump group 32A and the two from the primary side are formed. A flow path to the next side is formed. The plurality of first pump casings 41 are configured by, for example, a single first pump casing member 41A, a plurality of second pump casing members 41B, and a single third pump casing member 41C.

  Here, 41 A of 1st pump casing members are arrange | positioned at the lowest stage of 32 A of 1st pump groups, and comprise the accommodating part of the 1st pump casing 41 of a secondary side. The second pump casing member 41B is arranged at a position other than the lowermost stage and the uppermost stage of the first pump group 32A. The second pump casing member 41B constitutes a running water channel of the adjacent primary side first pump casing 41 and a storage portion of the secondary side first pump casing 41. The third pump casing member 41C is arranged on the uppermost stage of the first pump group 32A. 41 C of 3rd pump casing members comprise the running water channel of the 1st pump casing 41 of an adjacent primary side.

  The first impeller 42 is formed of, for example, stainless steel or resin. The first impeller 42 includes a discharge portion 42 a provided on the outer peripheral side of the first impeller 42, a suction portion 42 b provided on one main surface side of the first impeller 42, and a first impeller 42. And an impeller boss portion 42c extending in the axial direction from the other main surface side. The first impeller 42 is housed in the first pump casing 41 with the suction portion 42b facing downward in the axial direction.

  The second pump group 33A is configured by stacking a plurality of second pumps 33, for example. The second pump 33 pumps the water sucked from above downward. The second pump 33 includes a second pump casing 51 and a second impeller 52 fixed to the pump main shaft 22 and housed in the second pump casing 51. That is, in the second pump 33, as compared with the first pump 32, the second pump casing 51 and the second impeller 52 are arranged in opposite directions, so that the water pumping direction is set in the opposite direction. .. Therefore, in the multistage first pump group 32A, the uppermost stage is the primary side and the lowermost stage is the secondary side in the water flow direction, and the multistage second pump group 33A is in the water flow direction. The top row is the primary side and the bottom row is the secondary side.

  The second pump casing 51 includes, for example, a circular discharge port 51a, a storage portion 51b that stores the second impeller 52 therein, and an outer circumferential direction of the second pump casing 51 from the center side of the storage portion 51b. And a return vane 51c formed to communicate with the discharge port 51a and a guide blade 51d arranged in the storage portion 51b of the second pump casing 51 connected to the primary side.

  When the second pump casing 51 is connected, the return flow passage 51c forms a continuous flow of water with the storage portion 51b of the secondary pump casing 51 on the secondary side via the outlet 51a. ..

  The second pump casing 51 is formed so as to be connectable to the vertically adjacent second pump casing 51 and the flow passage casing 34. The second pump casing 51 and the flow channel casing 34 are integrally fixed by a fastening member. A space between the second pump casing 51 and the flow passage casing 34 is sealed by a sealing member such as an O-ring so that water inside does not leak.

  The second pump casing 51 has an opening that is separated from the second impeller 52 by a predetermined gap, and an opening in which the pump main shaft 22 and the main bearing are arranged, and faces the second impeller 52. A liner ring 51e is provided on the inner peripheral edge of the opening.

  Further, the lowermost second pump casing 51 has an underwater bearing 51f that comes into contact with a sleeve 22a provided on the pump main shaft 22.

  The second pump casing 51 as described above is configured by, for example, integrally combining a plurality of members, and by stacking the plurality of members, the second pump group 33A and the secondary pump group A flow path to the next side is formed. The plurality of second pump casings 51 includes, for example, a single fourth pump casing member 51A, a plurality of fifth pump casing members 51B, and a single sixth pump casing member 51C.

  Here, the fourth pump casing member 51A is arranged at the uppermost stage of the second pump group 33A and constitutes a storage portion for the second pump casing 51 on the primary side. The fifth pump casing member 51B is arranged at a position other than the uppermost stage and the lowermost stage of the second pump group 33A. The fifth pump casing member 51B constitutes a running water channel of the adjacent second-side pump casing 51 and a storage portion of the secondary-side second pump casing 51. The sixth pump casing member 51C is arranged at the lowermost stage of the second pump group 33A. The sixth pump casing member 51C constitutes a flowing water channel of the adjacent second pump casing 51 on the primary side.

  The second impeller 52 is formed of, for example, stainless steel or resin. The second impeller 52 includes a discharge portion 52 a provided on the outer peripheral side of the second impeller 52, a suction portion 52 b provided on one main surface side of the second impeller 52, and a second impeller 52. The impeller boss portion 52c extending in the axial direction from the other main surface side. The second impeller 52 is housed in the second pump casing 51 in a direction opposite to that of the first impeller 42, that is, with the suction portion 52b facing upward.

  In the first pump group 32A and the second pump group 33A, the differential pressure between the primary side and the secondary side of the first pump group 32A is the difference between the primary side and the secondary side of the second pump group 33A. It is configured to be larger than the pressure. Such a magnitude relationship of the differential pressure is set by, for example, setting the number and the diameter of the first impeller 42 included in the first pump group 32A and the number and the diameter of the second impeller 52 included in the second pump group 33A. Adjusted by.

  The flow path casing 34 covers the outer circumferences of the plurality of first pump casings 41 and the plurality of second pump casings 51, and surrounds the second pump casing 51 in the second stage from the uppermost stage of the first pump 32. The first flow path L1 that continues to the uppermost stage of the pump 33 and flows upward, and the periphery of the first pump casing 41 that flows downward from the lowermost stage of the second pump 33 to the secondary side. It constitutes the second flow path L2.

  The flow channel casing 34 includes, for example, a central casing 61, a first pipe casing 62 that covers the outer circumferences of the plurality of second pump casings 51, and a second pipe casing 63 that covers the outer circumferences of the plurality of first pump casings 41. And a spacer casing 64.

  The flow passage casing 34 constitutes the first flow passage L1 that continues from the uppermost stage of the first pump 32 to the uppermost stage of the second pump 33 by the central casing 61 and the first pipe casing 62. In addition, the flow passage casing 34 constitutes a second flow passage L2 that extends from the lowermost stage of the second pump 33 to the discharge port 31b of the flow passage cover 31 on the secondary side by the central casing 61 and the second pipe casing 63. To do.

  Here, the spacer casing 64 is disposed between the uppermost second pump 33 and the upper cover 35, and supports the connection between the first pipe casing 62 and the upper cover 35. Further, the spacer casing 64 has a plurality of suction ports 64a so that the water guided by the first flow path L1 can flow into the second pump 33.

  The central casing 61 includes a cylindrical portion 71 having a cylindrical shape, a plate portion 72 that divides the center of the cylindrical portion 71 in the axial direction, and a cylindrical portion 73 provided on both main surfaces of the plate portion 72. ..

  A plurality of, for example, a pair of cylindrical portions 73 are provided on both main surfaces of the plate portion 72 at symmetrical positions. The tubular portion 73 has one end integrally formed with the plate portion 72, opens a part of the plate portion 72, and opens the other end at the open end of the cylindrical portion 71. The cylindrical portion 73 has an opening shape formed in an arc shape.

  The central casing 61 constitutes an ascending channel 61a which is a part of the first channel L1 and also a descending channel 61b which is a part of the second channel L2.

  The ascending flow path 61a is a flow path that is continuous from a space defined by the plate portion 72 of the central casing 61 excluding the lower tubular portion 73 to the pair of upper tubular portions 73. The descending flow path 61b is a flow path that is continuous from a space defined by the plate portion 72 of the central casing 61 except the upper cylinder portion 73 to a pair of lower cylinder portions 73.

  Further, the cylindrical portion 71 has a spigot portion 71a that is watertightly connected to the first pipe casing 62 and the second pipe casing 63. The inlay part 71a is configured to be engageable with the first pipe casing 62 and the second pipe casing 63, and is watertightly engaged with the first pipe casing 62 and the second pipe casing 63.

  Further, in the center of the plate portion 72, the pump main shaft 22 is provided, and abuts on the impeller boss portion 42c of the first impeller 42 located at the uppermost stage and the impeller boss portion 52c of the second impeller 52 located at the lowermost stage. The sleeve 22a and the cylindrical liner ring portion 72a facing each other with a minute gap therebetween are provided.

  In addition, the plate portion 72 has a support portion 72b that abuts a part of the first pump casing 41 located at the uppermost stage.

  The upper cover 35 is arranged above the second pump group 33A and covers the upper portion of the flow channel casing 34. The upper cover 35 covers the upper portion of the first pipe casing 62 to prevent the water from flowing upward, and at the same time, prevents the water passing between the second pump group 33A and the first pipe casing 62 from passing through the spacer casing 64. And a flow path for guiding the suction port 64a to the suction port 64a. Further, the upper cover 35 covers the upper portion of the spacer casing 64 to prevent water from flowing upward, and also to provide a flow path for guiding the water that has flowed into the spacer casing 64 to the uppermost second pump 33. Constitute. A mechanical seal 23a is arranged between the upper cover 35 and the pump main shaft 22, and the mechanical seal 23a seals between the upper cover 35 and the pump main shaft 22.

  As shown in FIG. 2, the discharge pipe 80 has one end connected to the discharge port 31b of each pump 13 and the other end formed as a connection pipe 110. One end side of the discharge pipe 80, which is connected to the discharge port 31b, is extended along the horizontal direction, and the middle part is bent upward along the gravity direction so that the other end side is extended along the gravity direction. The discharge pipe 80 is provided on one end side of the discharge pipe 80 and has a rectifying fin 81 whose main surface is arranged along the horizontal direction. The rectifying fin 81 rectifies the water that has flowed into the discharge pipe 80 through the discharge port 31b.

  The check valve 90 is provided on the secondary side of the pump 13 and on the primary side of the connecting pipe 110, for example, in each discharge pipe 80. The check valve 90 prevents the reverse flow of water in the discharge pipe 80.

  The on-off valve 100 is provided on the secondary side of the pump 13 and on the primary side of the connecting pipe 110. The on-off valve 100 is provided, for example, at a position adjacent to the connecting portion between the discharge pipe 80 and the connecting pipe 110. The on-off valve 100 is provided in each discharge pipe 80, for example. The on-off valve 100 opens or closes the flow path continuous from the discharge pipe 80 to the connecting pipe 110.

  As shown in FIGS. 1 and 2, the connecting pipe 110 connects the other ends of the plurality of discharge pipes 80. The connecting pipe 110 has two open ends on the secondary side of the connected discharge pipes 80, one end of which is connected to a closing flange, and the other end of which is connected to a pipe that communicates with the water tap. The connection pipe 110 joins the water that has passed through the discharge pipes 80, and forms a flow path to the secondary side that communicates with the connected pipes.

  The connection pipe 120 is provided on the connection pipe 110 and is arranged on the secondary side of the position where the discharge pipe 80 is connected. Further, the connection pipe 120 is provided with a plurality of pressure accumulators 130. The connecting pipe 120 fluidly connects the plurality of pressure accumulators 130 and the connecting pipe 110.

  A plurality of pressure accumulators 130 are provided in the connection pipe 120. For example, two pressure accumulators 130 are provided. The pressure accumulator 130 is fluidly continuous with the connecting pipe 110 via the connecting pipe 120.

  The flow rate sensor 140 is configured to be able to detect the flow rate on the primary side or the flow rate on the secondary side of each pump 13. As a specific example, as shown in FIG. 2, the flow rate sensor 140 is provided in each discharge pipe 80 so that the flow rate on the secondary side of each pump 13 can be detected.

  The flow rate sensor 140 is provided, for example, on the secondary side of the rectifying fin 81 provided on the discharge pipe 80 and on the primary side of the check valve 90 provided on the discharge pipe 80. The flow rate sensor 140 is a flow meter that outputs a signal corresponding to the flow rate. The flow sensor 140 sends a signal to the controller 160.

As shown in FIG. 5, the flow rate sensor 140 is, for example, an impeller type flow rate detector including a rotating shaft 141, an impeller 142, and a detection unit 143 that detects the rotation of the impeller 142.
The rotary shaft 141 is arranged in the discharge pipe 80 in a direction in which the axial direction is orthogonal to the flow direction of water. The rotating shaft 141 is rotatably supported in the discharge pipe 80.

  The impeller 142 is fixed to the rotating shaft 141. The impeller 142 has a plurality of blades 142a provided at equal intervals along the circumferential direction of the rotating shaft, and a magnet 142b provided in an annular shape around the rotating shaft 141. The impeller 142 rotates the magnet 142b around the rotation axis 141 when the impeller 142a receives the water flow passing through the discharge pipe 80.

  The magnet 142b is magnetized, for example, so that N-poles or S-poles are alternately magnetized to form six poles around the rotation shaft 141 at equal intervals. In other words, the magnet 142b is magnetized with the north pole or south pole every 60 degrees centering on the rotation shaft 141.

  The detection unit 143 includes a sensor that detects the rotation of the magnet 142b and a detection substrate that is electrically connected to the sensor. The detection unit 143 converts the rotation of the magnet 142b accompanying the rotation of the impeller 142 into a pulse signal.

  As a specific example, the sensor is an alternating detection type Hall IC that is a magnetic detection element. The Hall IC outputs an ON signal each time the N pole of the magnet 142b approaches, and outputs an OFF signal when the N pole does not approach, such as when the N pole of the magnet 142b separates and the S pole approaches. That is, the Hall IC outputs a pulse signal that is a binary signal of an ON signal and an OFF signal. The detection unit 143 is electrically connected to the control device 160 via a signal line or the like, and transmits the pulse signal output from the Hall IC to the control device 160.

  As shown in FIG. 1, the pressure sensor 150 is provided in the connecting pipe 110. The pressure sensor 150 is configured to be able to detect the pressure inside the connecting pipe 110. The pressure sensor 150 is electrically connected to the control device 160 via a signal line or the like, and outputs a signal, for example, an analog signal, to the control device 160 according to the pressure in the connecting pipe 110.

  As shown in FIG. 1, the control device 160 includes an inverter 161, a storage unit 162, a timer 164, and a control unit 163.

  The inverter 161 is electrically connected to the motor 11 and the control unit 163 via a signal line. For example, the same number of inverters 161 as the motors 11 are provided. In this embodiment, three inverters 161 are provided. The inverter 161 varies the rotation speed of the motor 11 by varying the frequency.

  The storage unit 162 includes a plurality of stop flow rates Q for stopping the pump device 10, as a specific example, a first stop flow rate Q1, a second stop flow rate Q2 having a value larger than the first stop flow rate Q1, and a second stop flow rate. A third stop flow rate Q3 having a value larger than Q2, a first pressure P1 which is the pressure in the connecting pipe 110 when the discharge flow rates from the plurality of pump devices 10 are rated flow rates, and the plurality of pump devices 10 The pressure in the connecting pipe 110 when only one of them is driven and the discharge flow rate from the pump device 10 is the first stop flow rate Q1 which is the minimum value among the plurality of stop flow rates. , A second pressure P2 set lower than the first pressure P1, and a plurality of starting pressures SP for driving the pump device 10, and a first starting used when a first stop flow rate Q1 is selected as a specific example. The pressure SP1, the second starting pressure SP2 used when the second stop flow rate Q2 is selected, the third starting pressure SP3 used when the third stop flow rate Q3 is selected, and the fourth starting pressure SP3. SP4, a stop flow rate selection threshold T1 for selecting one from a plurality of stop flow rates Q, a start pressure changing threshold T2 for changing the start pressure based on the pressure of the pump device 10 after the stop, and a forced operation time T3. Memorize

  The first stop flow rate Q1 is the temperature of the water in the pump 13 when the driving time from the start of the pump device 10 is less than a first threshold value T11 described later, and the sliding portion of the mechanical seal 23a is excessively worn. It is a flow rate that can be maintained at a temperature that does not progress to Further, in the present embodiment, the first stop flow rate Q1 is a flow rate that flows from one water tap at a normal opening degree. The faucet is, for example, a terminal device such as a faucet or a shower head. The first stop flow rate Q1 is, for example, 10 L / min. The state in which the wear is excessively advanced means, for example, a wear amount equivalent to the wear amount when the operation of discharging the water having a temperature near 25 ° C. which is the water temperature in the normal state is continuously performed for one year. It is the state that has occurred. In other words, in normal use, the pump device 10 alternates between an operating state and a stopped state. However, the amount of wear in a state where the wear is excessively advanced does not cause the stopped state, and the pump device 10 is operated for one year. The amount of wear is equivalent to the amount of wear when continued.

  One of the factors causing the life of the sliding portion of the mechanical seal 23a to progress excessively is the water temperature and the rotation speed of the motor spindle 21. The water temperature is raised by being stirred by the impellers 42 and 52. In addition, the temperature rise width increases as the driving time increases. The higher the water temperature, the more excessive the abrasion of the sliding portion of the mechanical seal 23a. The higher the rotational speed of the motor main shaft 21, the more excessive the wear of the sliding portion of the mechanical seal 23a.

  On the other hand, as the rotation speed of the motor main shaft 21 increases, the rotation speeds of the impellers 42 and 52 also increase, and the discharge flow rate of the pump 13 increases. As a result, the action of moving the temperature of the water in the pump 13 is increased, and the increase in the water temperature is reduced. In other words, when the discharge flow rate of the pump 13 increases, the increase range of the water temperature decreases, and as a result, the temperature of the water discharged from the pump 13 decreases as compared to when the discharge flow rate is low.

  The first stop flow rate Q1 is a value at which abrasion of the sliding portion of the mechanical seal 23a does not proceed excessively even with the combination of the temperature rise width of water and the rotation speed of the motor main shaft 21.

  The second stop flow rate Q2 is the mechanical temperature of the water in the pump 13 when the drive time from the start of the pump device 10 is equal to or more than a first threshold value T11 and less than a second threshold value T12 described later. The flow rate can be maintained at a temperature at which the sliding portion of the seal 23a is not excessively worn.

  FIG. 6 shows a temperature change of water in the upper cover 35. The horizontal axis of FIG. 6 represents time, and the vertical axis represents the temperature of water in the upper cover 35. As shown in FIG. 6, when the discharge flow rate from the pump 13 was switched from the first stop flow rate Q1 to the second stop flow rate Q2 at the time t1, the water temperature decreased. The first stop flow rate Q1 is, for example, 10 L / min, and the second stop flow rate Q2 is, for example, 20 L / min.

  For the third stop flow rate Q3, the sliding portion of the mechanical seal 23a excessively wears the temperature of water in the pump 13 when the drive time from the start of the pump device 10 is equal to or more than the second threshold value T12. The flow rate is set so that it can be maintained at a temperature that does not occur, and the bubbles in the pump 13 can be discharged to the outside of the pump 13.

  FIG. 7 shows a temperature change of water in the upper cover 35. The horizontal axis of FIG. 7 represents time, and the vertical axis represents the temperature of water in the upper cover 35. As shown in FIG. 7, when the discharge flow rate from the pump 13 was switched from the second stop flow rate Q2 to the third stop flow rate Q3 at the time t2, the water temperature further decreased. The second stop flow rate Q2 is, for example, 20 L / min, and the third stop flow rate Q3 is, for example, 30 L / min.

  As the stop flow rate Q of the pump device 10, one of the first stop flow rate Q1, the second stop flow rate Q2, and the third stop flow rate Q3 is selected.

The first pressure P1 is the pressure in the connecting pipe 110 when the discharge flow rate of water from the water supply device 1 is the rated flow rate. The total discharge flow rate from all the pumps 13 is the discharge flow rate of water from the water supply device 1. The flow rate in the connecting pipe 11 is detected by the sum of the discharge flow rates from all the pumps 13 obtained based on the outputs from all the flow rate sensors 140. In the present embodiment, the first pressure P1 is the pressure when the sum of the discharge flow rates from the plurality of pump devices 10 is the rated flow rate because the water supply device 1 is configured to include the plurality of pump devices 10. However, for example, when the water supply device 1 is configured to have only one pump device 10, the discharge flow rate of this one pump device 10 becomes the pressure when the rated flow rate is reached.
The second pressure P2 is the pressure in the connecting pipe 110 when the discharge flow rate from the pump 13 is the minimum value of the plurality of stop flow rates stored in the storage unit 162, and in the present embodiment, the first pressure P2. The pressure when the flow rate is the stop flow rate Q1, for example, the pressure corresponding to the loss at the rated flow rate of the pipe connected to the water supply device 1 is set by subtracting from the first pressure P1.

  The first starting pressure SP1 is the starting pressure used when the first stop flow rate Q1 is selected. The first starting pressure SP1 is set to a value lower than the second pressure P2. The first starting pressure SP1 is a pressure lower than the second pressure P2 by a first predetermined value h1.

  The second starting pressure SP2 is the starting pressure used when the second stop flow rate Q2 is selected. The second starting pressure SP2 has the same value as the second pressure P2.

  The third starting pressure SP3 is the starting pressure used when the stop flow rate is the third stop flow rate Q3. The third starting pressure SP3 is a pressure higher than the second pressure P2 by a second predetermined value h2. In addition, in the present embodiment, the first predetermined value h1 and the second predetermined value h2 are, for example, the same value. Note that the first predetermined value h1 and the second predetermined value h2 are not limited to being the same value. The first predetermined value h1 may be a value different from the second predetermined value h2.

  The fourth starting pressure SP4 is a starting pressure set by the control unit 163 based on a signal from the pressure sensor 150 within the starting pressure changing threshold T2 after the pump device 10 is stopped. The fourth starting pressure SP4 is a value lower than the first starting pressure P1 by a third predetermined value h3 and higher than the third starting pressure SP3.

  The stop flow rate selection threshold value T1 is a threshold value for the drive time. The stop flow rate selection threshold value T1 includes a first threshold value T11 that selects the first stop flow rate Q1 or the second stop flow rate Q2, and a second threshold value T12 that selects the third stop flow rate Q3. .. The second threshold T12 is larger than the first threshold T11.

The starting pressure changing threshold T2 is a threshold for the stop time. The starting pressure changing threshold T2 is a threshold for changing the starting pressure from the first starting pressure SP1, the second starting pressure SP2, or the third starting pressure SP3 to the fourth starting pressure SP4.
The forced operation time T3 is the time during which the drive is maintained after the pump device 10 is started. In other words, the drive of the pump device 10 is maintained even if the stop flow rate is detected before the forced operation time T3 elapses. The forced operation time T3 is set to a time period during which the temperature rise of the water in the pump 13 can be suppressed within a predetermined range even when the pump device 10 is shut off. The predetermined range mentioned here is a range in which the temperature inside the pump 13 does not reach a temperature at which abrasion of the sliding portion of the mechanical seal 23a proceeds excessively.
The forced operation time T3 is (maximum operation time T4)-(previous stop time T5 of the pump device 10). The maximum operating time T4 is, for example, 60 seconds. The maximum operating time T4 is a time shorter than the first threshold value T11.
The storage unit 162 also stores a stop time T5 that is the time when the operation of the plurality of pump devices 10 is stopped.
The timer 164 measures the drive time from the start of the pump device 10. Further, the timer 164 measures the stop time of the pump device 10.

The control unit 163 controls the plurality of pump devices 10 based on the measurement time of the timer 164. As a specific example, the control unit 163 calculates a time obtained by subtracting the stop time T5, which is the previous operation stop time stored in the storage unit 162, from the maximum operation time T4 stored in the storage unit 162 as the forced operation time T3. To do. When the control unit 163 detects the stop flow rate based on the output of the flow rate sensor 160, as will be described later, after the activated pump device 10 is operated and after the calculated forced operation time T3 operation, the control unit 163 activates the pump device 10. Stop. In addition, the control unit 163 continues the operation of the pump device 10 when the stop flow rate is not detected after the forced operation time T3 has elapsed. In this way, the control unit 163 continues the operation for at least the forced operation time T3 after starting the pump device 10.
After the pump device 10 is started, the control unit 163 detects the flow rate for the first time after the forced operation time T3 elapses, and if it does not detect the flow rate below the stop flow rate, it detects the flow rate regularly or constantly thereafter. .. Alternatively, the control unit 163 may be configured to detect the flow rate after the pump device 10 is activated and before the forced operation time T3 has elapsed.
The control unit 163 also detects the discharge flow rate from each pump 13 based on the signal received from the flow rate sensor 140. The control unit 163 also detects the pressure in the connecting pipe 110 based on the signal received from the pressure sensor 150. Further, the control unit 163 controls each inverter 161 based on the detected values of the flow rate and the pressure based on the flow rate sensor 140 and the pressure sensor 150, and the information stored in the storage unit 162, and the water supply device 1 is taken as an example. The estimated terminal pressure is controlled to be constant, the target pressure is set to the first pressure P1 at the rated flow rate and to the second pressure P2 at the first stop flow rate Q1 according to the discharge flow rate, and the speed of the motor 11 is controlled. .. The water supply device 1 is not limited to the constant estimated end pressure control. The water supply device 1 may be controlled by, for example, constant discharge pressure control.

  When the control unit 163 detects the selected first stop flow rate Q1, second stop flow rate Q2, or third stop flow rate Q3, the control unit 163 changes the setting of the target pressure to the first pressure P1 and changes the pump device. When 10 is accelerated and the first pressure P1 is detected, the pump device 10 is stopped.

Next, the operation of the water supply device 1 will be described.
When the control unit 163 detects the starting pressure based on the signal from the pressure sensor 150, the control unit 163 starts the pump device 10 and controls it by the estimated constant end pressure control. The control unit 163 increases the number of driven pump devices 10 or decreases the number of driven pump devices 10 as necessary.

  When the motor main shaft 21 rotates by driving the motor 11, the pump main shaft 22 connected via the shaft coupling 23 rotates. As the pump main shaft 22 rotates, the first impeller 42 and the second impeller 52 fixed to the pump main shaft 22 rotate.

  By the rotation of the first impeller 42, water is sucked from the suction portion 42b of the first impeller 42, the water sucked in the first impeller 42 is pressurized, and the discharge portion 42a of the first impeller 42 is increased. Water is spit out from. In this way, the water sucked from the suction portion 42b of the first impeller 42 sequentially passes through the inside of the first impeller 42 and the first pump casing 41, and then flows through the inside of the first impeller 42. Water is pumped from the suction port 31a of the road cover 31 to the ascending flow path 61a of the central casing 61.

  Further, the temperature of the water rises as it is agitated by the plurality of first impellers 42 in the process of being pumped to the ascending flow path 61a.

  Subsequently, the water pumped up to the ascending flow path 61a is guided to the uppermost second pump 33 via the first flow path L1 between the second pump group 33A and the first pipe casing 62. .. The temperature of the water passing through the first flow path L1 is lower than the temperature of the water flowing through the second pump group 33A. Therefore, heat exchange is performed between the water flowing through the first flow path L1 and the water flowing through the second pump group 33A.

  The water guided to the uppermost second pump 33 is sucked from the suction portion 52b of the rotating second impeller 52, increased in pressure in the second impeller 52, and discharged from the discharge portion 52a of the second impeller 52. Be exhaled.

  As described above, the water sucked from the suction portion 52b of the second impeller 52 sequentially passes through the inside of the second impeller 52 and the second pump casing 51, and then passes through the inside of the second impeller 52. The second pump 33 in the upper stage is pressure-fed downward to the descending flow passage 61b of the central casing 61. The water is agitated by the plurality of second impellers 52 in the process of being pressure-fed to the descending flow path 61b, and thus rises above the temperature of the water in the uppermost second pump 33.

  The water pressure-fed to the descending flow path 61b is guided to the discharge port 31b of the flow path cover 31 via the second flow path L2 between the first pump group 32A and the second pipe casing 63, and the discharge port 31b. More exhaled. The temperature of the water flowing through the second flow path L2 is higher than the temperature of the water flowing through the first pump group 32A. Therefore, heat exchange is performed between the water flowing through the second flow path L2 and the water flowing through the first pump group 32A. Further, since the water flowing through the second flow path L2 is sent to the water supply destination, the inside of the pump device 10 has the highest water temperature in the uppermost second pump 33.

  The control unit 163 measures the operation time from the start of the pump device 10 and increases the stop flow rate Q according to the operation time. In the present embodiment, as an example, the control unit 163 measures the operating time of the pump device 10 and compares the operating time with the threshold value T1 for selecting the stopped flow rate, and selects one from a plurality of stopped flow rates. The first stop flow rate Q1, the second stop flow rate Q2, or the third stop flow rate Q3 is selected.

  Specifically, the control unit 163 selects the first stop flow rate Q1 in the range where the operating time t of the pump device 10 is less than the first threshold value T11. The control unit 163 selects the second stop flow rate Q2 when the operating time t of the pump device 10 becomes the first threshold value T11 or more. The control unit 163 selects the third stop flow rate Q3 when the operating time t of the pump device 10 becomes the second threshold value T12 or more.

  In other words, the control unit 163, after the pump device 10 has been started until the pump device 10 is stopped, is the first stop as the stop flow rate within a range where the drive time is less than the first threshold value T11. When the flow rate Q1 is selected and then the drive time becomes the first threshold value T11 or more, the second stop flow rate Q2 is selected as the stop flow rate again, and when the drive time becomes the second threshold value T12 or more, the flow rate is stopped again. The third stop flow rate Q3 is selected as the flow rate.

  The control unit 163 selects the first stop flow rate Q1 and the second stop flow rate Q2 selected by the pump device 10 based on the signal from the flow rate sensor 140 of the last pump device 10 that is being driven. , Or the third stop flow rate Q3 is detected, the target pressure is set to the first pressure P1 and the pump device 10 is accelerated. When the control unit 163 detects the first pressure P1 based on the signal from the pressure sensor 150, the control unit 163 stops the pump device 10. When the pump unit 10 is stopped, the control unit 163 returns the stop flow rate of the pump device 10 to the first stop flow rate Q1 which is the initial value.

  In addition, the control unit 163 sets the next starting pressure as the initial value of the starting pressure according to the selected first stop flow rate Q1, second stop flow rate Q2, or third stop flow rate Q3. The first predetermined value h1 is set lower than the second pressure P2, the second pressure P2 is set, or the second predetermined value h2 is set higher than the second pressure P2.

  In the present embodiment, as an example, the control unit 163 sets the first starting pressure SP1, the second starting pressure SP2, or the third starting pressure SP3 stored in the storage unit 162 to the starting pressure. ..

  Specifically, the control unit 163 sets the first starting pressure SP1 as the next starting pressure for the pump device 10 for which the first stop flow rate Q1 is selected. The control unit 163 sets the second starting pressure SP2 as the next starting pressure for the pump device 10 for which the second stop flow rate Q2 is selected. The control unit 163 sets the third starting pressure SP3 as the next starting pressure for the pump device 10 for which the third stop flow rate Q3 is selected.

  In addition, the control unit 163 detects the first pressure P1 by accelerating the pump device 10 and stops driving the pump device 10, and then outputs a signal from the pressure sensor 150 within the threshold value T2 for changing the starting pressure. When it is detected that the pressure in the connecting pipe 110 becomes equal to or lower than the fourth starting pressure SP4, which is the third predetermined value h3 lower than the first pressure P1, based on the above, the pump device 10 is started. After that, the control unit 163 sets the fourth starting pressure SP4 stored in the storage unit 162 as the starting pressure.

Next, the control part 163 will start the pump apparatus 10, if the set 1st starting pressure SP1, 2nd starting pressure SP2, 3rd starting pressure SP3, or 4th starting pressure SP4 is detected. By the constant estimated end pressure control, the target pressure is set to the first pressure P1 at the rated flow rate and to the second pressure P2 at the first stop flow rate Q1 according to the discharge flow rate, and the pump device 10 is operated at the speed. Control.
In addition, the control unit 163 calculates the forced operation time T3 from the previous driving stop time T5 and the maximum operation time T4 stored in the storage unit 162 after the pump device 10 is activated. The control unit 163 detects the first flow rate based on the signal from the flow rate sensor 140 when the forced operation time T3 has elapsed after the pump device 10 was started. When the control unit 163 detects any of the set stop flow rates Q, the control unit 163 stops the pump device 10. Further, when the control unit 163 does not detect the set stop flow rate Q when the forced operation time T3 has elapsed, the control unit 163 continues the operation of the pump device 10.

  According to the water supply device 1 configured as described above, the control unit 163 increases the stop flow rate Q in comparison with the initial value in accordance with the increase in the drive time from the startup of the pump device 10. Therefore, the pump device 10 is stopped in a state where the discharge flow rate from the pump 13 is relatively large, so that the pump device 10 is stopped in a state in which an increase in the temperature of the water in the pump 13 is suppressed by the water flow. Therefore, even if the discharge flow rate from the pump 13 is reduced, the temperature of the water in the pump 13 can be prevented from rising. Therefore, high temperature water can be prevented from staying in the pump 13.

  Since high temperature water can be prevented from staying in the pump 13, wear of the sliding portion of the mechanical seal 23a can be suppressed. As a result, the life of the mechanical seal 23a can be extended. Further, the relief pipe as a structure for preventing the high temperature water from staying in the pump 13 is not provided in the pump 13. Therefore, since there is no water flowing out of the pump 13 through the escape pipe, it is possible to prevent the pump performance from deteriorating, as shown in FIG.

  In FIG. 8, pumping performance, pump efficiency, overall efficiency, and shaft power are shown. The solid lines show the pump device 10, and the dotted lines show the pump device having a relief pipe. The configuration of the pump device having the escape pipe is a configuration in which a relief pipe that connects the inside of the pump 13 and the outside of the pump 13 is provided in the configuration of the pump device 10. In the water supply device having the pump device provided with the relief pipe, the stop flow rate is not increased in accordance with the discharge flow rate from the pump device unlike the water supply device 1. Also, the starting pressure is not increased or decreased according to the stop flow rate. As shown in FIG. 8, the pump device 10 is superior in pumping performance, pump efficiency, and overall efficiency as compared with a pump device provided with a relief pipe.

  As described above, according to the water supply device 1, it is possible to prevent the high-temperature water from staying in the pump 13, prevent the deterioration of the pump performance, and increase the starting pressure with the increase of the stop flow rate to supply the water. It is possible to prevent the previous decrease in pressure.

  Further, since the stop flow rate Q includes the first stop flow rate Q1, the second stop flow rate Q2, and the third stop flow rate Q3, it is possible to prevent hot water from staying in the pump 13, and It is possible to prevent air from staying inside. By preventing the accumulation of air in the pump 13, it is possible to prevent the sliding parts such as the mechanical seal 23a and the submerged bearing 51f from being dry-operated, so that the sliding part is damaged and the heat is generated due to the dry operation. It can be prevented.

  Further, when the pump device 10 is stopped, the control unit 163 resets the stop flow rate to return it to the first stop flow rate Q1 which is the initial value. For this reason, it is possible to prevent the pump device 10 from being stopped early during the next operation of the pump device 10, so that the starting frequency of the pump device 10 can be reduced.

  Further, when the water supply device 1 detects the stop flow rate Q of the last driving unit, it sets the target pressure to the first pressure P1 to accelerate the pump device 10. Then, the water supply device 1 has a first starting pressure SP1, a second starting pressure SP2, which is lower than the second pressure P2 by a first predetermined value h1, or a second predetermined value h2 which is higher than the second pressure P2 by a second predetermined value h2. The pump device 10 is started by the starting pressure SP3 of 3.

  As a result, when the third stop flow rate Q3 having a relatively large discharge flow rate is selected while sufficiently securing the differential pressure between the first pressure P1 and the starting pressure when the pump device 10 is stopped, Even if the water supply is started by opening the water supply destination, it is possible to prevent a rapid decrease in the pressure at the water supply destination.

  Further, the water supply device 1 is the fourth start-up lower than the first pressure P1 by the third predetermined value h3 based on the output from the pressure sensor 150 within the start-up pressure changing threshold T2 after the pump device 10 is stopped. When it is detected that the pressure becomes equal to or lower than SP4, the pump device 10 is started. Therefore, even when the water supply flow rate increases sharply after the water supply destination opens after the pump device 10 is stopped, it is possible to prevent the pressure at the water supply destination from rapidly decreasing.

  Further, the water supply device 1 can reduce the cost of the water supply device 1 by using the impeller type flow rate sensor, which is less expensive than the electromagnetic flow meter.

Further, in the water supply device 1, the pump 13 is configured as a vertical multi-stage pump including the first pump group 32A and the second pump group 33A in which the suction directions of water are opposite to each other. Between the water flowing through the second flow passage L1 and the water flowing through the second pump group 33A, and between the water flowing through the second flow passage L2 and the water flowing through the first pump group 32A. It becomes possible to perform heat exchange. For this reason, it is possible to suppress the increase range of the temperature of the water discharged from the pump 13 to be small.
Further, the water supply device 1 continues the operation of the pump device 10 during the forced operation time T3 after the activation of the pump device 10. Therefore, the activation frequency of the pump device 10 can be reduced. Further, the forced operation time T3 is a time obtained by subtracting the last operation stop time T5 from the maximum operation time T4. That is, the shorter the last operation stop time T5, the longer the forced operation time T3. Therefore, the forced operation time T3 becomes long when the previous operation stop time is short and the heat inside the pump 13 is relatively high, so that the temperature of the water inside the pump 13 can be reduced.

  In the above-described embodiment, the flow sensor 140 has the configuration in which the rotary shaft 141 is rotatably supported in the discharge pipe 80 and the impeller 142 is fixed to the rotary shaft 141, but the flow sensor 140 is described as an example. It is not limited to this. The flow rate sensor 140 may be provided so that the impeller 142 receives the water flow and is rotatable. The flow sensor 140 may have a configuration in which the rotating shaft 141 is fixed and the impeller 142 is rotatably supported by the rotating shaft 141, for example.

  Further, in the above-described embodiment, the configuration including the impeller 142 as the flow rate sensor 140 has been described as an example, but the present invention is not limited to this. The flow rate sensor 140 may have a configuration capable of detecting a plurality of flow rates, for example. In the present embodiment, the flow rate sensor 140 only needs to be able to detect the first stop flow rate Q1, the second stop flow rate Q2, and the third stop flow rate Q3, and as a specific example of this configuration, the first stop flow rate Q1. A paddle type flow sensor for detecting Q1, a paddle type flow sensor for detecting the second stop flow rate Q2, and a paddle type flow sensor for detecting the third stop flow rate Q3 may be provided.

  Further, in the above-described embodiment, the pump 13 has been described as an example of the multi-stage pump configured to include the first pump group 32A and the second pump group 33A, but the pump 13 is not limited to this. The pump 13 may be a pump other than the multistage pump.

  Further, in the above-described embodiment, the control unit 163 stores a plurality of stop flow rates in the storage unit 162 as an example of a configuration in which the stop flow rate is increased with respect to the initial value in accordance with the drive time from the startup of the pump device 10. Has been described, and one of the stopped flow rates is selected according to the driving time, but the present invention is not limited to this. For example, the stop flow rate may be stored in the storage unit 162, and the control unit 163 may increase the stop flow rate by using the stop flow rate as an initial value and thus increasing the drive time from the start of the pump device 10. ..

  As a specific example of this, the first stop flow rate Q1 is stored in the storage unit 162, and when the control unit 163 drives the driving time of the pump device 10 from the start to the first threshold value T11 or more, the first stop flow rate Q1 is stopped. When a predetermined value is added to the flow rate Q1 to calculate the second stop flow rate Q2, the calculation result is set as the stop flow rate, and when the drive time of the pump device 10 becomes equal to or more than the second threshold value T12 from the start, the second It is also possible to add a predetermined value to the stop flow rate Q2 and increase it to calculate a third stop flow rate Q3 and set the calculation result as the stop flow rate.

  Further, in the present embodiment, the control unit 163 sets the starting pressure used when the first stop flow rate Q1 is selected to be a value lower than the second pressure P2 that is the initial value by the first predetermined value h1. , The starting pressure used when the second stop flow rate Q2 is selected is the second pressure P2 which is the initial value, and the starting pressure used when the third stop flow rate Q3 is selected is the initial value which is the initial value The first starting pressure SP1, the second starting pressure SP2, and the third starting pressure SP3 are stored in the storage unit 162 as a configuration in which the second predetermined value h2 is higher than the second pressure P2. The configuration in which the control unit 163 selects the first starting pressure SP1, the second starting pressure SP2, or the third starting pressure SP3 has been described as an example, but the present invention is not limited to this. For example, if the storage unit 162 does not store the first to third startup pressures SP1, SP2, and SP3 and the control unit 163 determines that the stop flow rate is the first stop flow rate Q1, the second pressure P2 is When the stop flow rate is the second stop flow rate Q2, the second pressure P2 is set as the start pressure, and the stop flow rate is set to the start pressure. Is the third stop flow rate Q3, a value higher than the second pressure P2 by the second predetermined value h2 may be calculated, and the calculation result may be set as the starting pressure.

  In addition, in the above-described embodiment, after the pump device 10 is stopped, within the threshold value T2 for changing the starting pressure, the fourth starting pressure SP4 which is lower than the first pressure P1 by the third predetermined value h3 becomes equal to or lower than the fourth starting pressure SP4. When detected, as an example of a configuration for starting the pump device 10, the storage unit 162 stores a fourth startup pressure SP4 that is a third predetermined value h3 lower than the first pressure P1, and the control unit 163 stores the fourth startup pressure SP4. The configuration for selecting the starting pressure SP4 of No. 1 has been described as an example, but the present invention is not limited to this. For example, when the control unit 163 detects the threshold value T2 for changing the starting pressure, the control unit 163 may calculate a pressure lower than the first pressure P1 by a third predetermined value h3 and set the calculation result as the starting pressure.

  Further, in the above-described embodiment, the configuration in which the flow rate sensor 140 is provided on the secondary side of the pump 13 has been described as an example, but the configuration is not limited to this. The flow rate sensor 140 may be provided on the primary side of the pump 13.

Further, in the above-described embodiment, the configuration in which the plurality of pump devices 13 are provided has been described as an example, but the configuration is not limited to this. For example, one pump device 13 may be used.
Further, in the above-described embodiment, the configuration in which the storage unit 162 stores the first stop flow rate Q1, the second stop flow rate Q2, and the third stop flow rate Q3 as the plurality of stop flow rates is described as an example. However, it is not limited to this. The plurality of stop flow rates stored in the storage unit 162 may be four or more.

The present invention is not limited to the above-described embodiment, and can be variously modified at the stage of carrying out the invention without departing from the spirit thereof. Further, the respective embodiments may be appropriately combined and implemented, in which case the combined effects can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent features. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect can be obtained, the structure in which the constituent elements are deleted can be extracted as the invention.
Hereinafter, a description equivalent to the invention described in the initial claims of the present application will be additionally given.
[1]
A pump device having a pump and a motor for driving the pump;
A flow rate sensor that is provided on the primary side or secondary side of the pump and outputs a signal according to the discharge flow rate of the pump,
When the drive time from the start of the pump device is measured, the stop flow rate is increased with respect to the initial value according to the increase of the drive time, and the stop flow rate is detected based on the output from the flow rate sensor, the pump device. A control unit for stopping the driving of
Water supply device.
[2]
A storage unit that stores a plurality of the stop flow rates including the initial value and a threshold value that selects one from the plurality of the stop flow rates according to the drive time of the pump device,
The control unit selects one from the plurality of stop flow rates based on the drive time and the threshold value.
The water supply device according to [1].
[3]
The water supply device according to [1], wherein the control unit returns the stopped flow rate to the initial value after the operation of the pump device is stopped.
[4]
A pressure sensor that is provided on the secondary side of the pump device and outputs a signal according to the pressure;
The plurality of stop flow rates are a first stop flow rate that is the initial value, a second stop flow rate that is greater than the first stop flow rate, and a third stop flow rate that is greater than the second stop flow rate. Including,
The threshold includes a first threshold and a second threshold greater than the first threshold,
The storage unit has a first pressure when the discharge flow rate from the pump device reaches a rated flow rate and a pressure lower than the first pressure when the discharge flow rate from the pump device reaches the first stop flow rate. Memorize the set second pressure,
The control unit drives the pump device by a constant estimated end pressure control until the stop flow rate is detected, and selects the first stop flow rate until the drive time exceeds the first threshold value, The subsequent starting pressure is set to a pressure lower than the second pressure by a first predetermined value, and when the driving time exceeds the first threshold value, the second stop flow rate is selected to set the subsequent starting pressure to the first starting pressure. 2 when the driving time exceeds the second threshold value, the third stop flow rate is selected, and the subsequent starting pressure is set to a pressure that is higher than the second pressure by a second predetermined value, and When the stop flow rate is detected based on the signal from the flow rate sensor, the target pressure is changed to the first pressure to accelerate the pump device, and the target pressure is changed to the target pressure based on the signal from the pressure sensor. When it is judged that it has reached, stop the pump device
The water supply device according to [2].
[5]
The control unit, after stopping the pump device, within the threshold for starting pressure change, the pressure sensor
The water supply device according to [4], which starts the pump device when it is detected that the pressure is lower than the first pressure by a third predetermined value larger than the second predetermined value based on a signal from the.
[6]
The flow sensor is
A rotation axis,
An impeller provided with a blade and a magnet provided on the rotating shaft to rotate by receiving a water flow,
A detection unit that detects the rotation of the magnet and outputs a pulse signal based on an ON signal and an OFF signal;
The water supply device according to [1].
[7]
The pump is
A spindle extending in the direction of gravity,
A plurality of first pumps having a first pump casing and a first impeller fixed to the main shaft, for pumping upwardly sucked water from below;
A plurality of second pumps arranged above the plurality of first pump casings, having a second pump casing and a second impeller fixed to the main shaft, and pumping downwardly sucked water from below. When,
From the first pump at the uppermost stage to the second pump at the uppermost stage, covering the outer circumferences of the plurality of first pump casings and the plurality of second pump casings and around the second pump casing. A first flow passage that flows upward and a second flow passage that flows downward from the second pump in the lowest stage to the secondary side are formed around the first pump casing. A flow channel casing,
The water supply device according to [1].

  1 ... Water Supply Device 1 ... Pump Device 10 ... Motor, 23a ... Mechanical Seal, 32 ... First Pump, 32A ... First Pump Group, 33 ... Second Pump, 33A ... Second Pump Group, 140 ... Flow Rate Sensor, 141 ... Rotating shaft, 142 ... Impeller, 142b ... Magnet, 143 ... Detecting part, 150 ... Pressure sensor, 160 ... Control device, 161 ... Inverter, 162 ... Storage part, 163 ... Control part, L1 ... First Channel, L2 ... Second channel.

Claims (6)

A pump device having a pump and a motor for driving the pump;
A flow rate sensor that is provided on the primary side or secondary side of the pump and outputs a signal according to the discharge flow rate of the pump,
When the drive time from the start of the pump device is measured, the stop flow rate is increased with respect to the initial value according to the increase of the drive time, and the stop flow rate is detected based on the output from the flow rate sensor, the pump device. A control unit for stopping the driving of
Equipped with
A storage unit that stores a plurality of the stop flow rates including the initial value and a threshold value that selects one from the plurality of the stop flow rates according to the drive time of the pump device,
The water supply device in which the control unit selects one from the plurality of stop flow rates based on the drive time and the threshold value .   The water supply device according to claim 1, wherein the control unit returns the stop flow rate to the initial value after the operation of the pump device is stopped. A pressure sensor that is provided on the secondary side of the pump device and outputs a signal according to the pressure;
The plurality of stop flow rates are a first stop flow rate that is the initial value, a second stop flow rate that is greater than the first stop flow rate, and a third stop flow rate that is greater than the second stop flow rate. Including,
The threshold includes a first threshold and a second threshold greater than the first threshold,
The storage unit has a first pressure when the discharge flow rate from the pump device reaches a rated flow rate and a pressure lower than the first pressure when the discharge flow rate from the pump device reaches the first stop flow rate. Memorize the set second pressure,
The control unit drives the pump device with estimated terminal pressure constant control until detecting a selected stop flow rate among the first stop flow rate, the second stop flow rate, and the third stop flow rate , Until the drive time exceeds the first threshold value, the first stop flow rate is selected, and the subsequent starting pressure is set to a pressure lower than the second pressure by a first predetermined value, and the drive time is set to the first time. When the threshold value of 1 is exceeded, the second stop flow rate is selected, the subsequent starting pressure is set to the second pressure, and when the drive time exceeds the second threshold value, the third stop flow rate is selected. Then, the subsequent starting pressure is set to a pressure that is higher than the second pressure by a second predetermined value, and the first stop flow rate, the second stop flow rate, and the third stop flow rate based on the signal from the flow rate sensor . When the selected stop flow rate is detected from among the stop flow rates, the target pressure on the secondary side of the pump is changed to the first pressure to accelerate the pump device, and a signal from the pressure sensor is output. The water supply device according to claim 1, wherein the pump device is stopped when it is determined that the target pressure has been reached. After stopping the pump device, the control unit is within a threshold value for starting pressure change, and a third predetermined pressure that is larger than the first predetermined pressure and is larger than the second predetermined value based on a signal from the pressure sensor. The water supply device according to claim 3 , wherein the pump device is started when it is detected that the value has decreased. The flow sensor is
A rotation axis,
An impeller provided with a blade and a magnet provided on the rotating shaft to rotate by receiving a water flow,
A detection unit that detects the rotation of the magnet and outputs a pulse signal based on an ON signal and an OFF signal;
The water supply device according to claim 1 , further comprising: The pump is
A spindle extending in the direction of gravity,
A plurality of first pumps having a first pump casing and a first impeller fixed to the main shaft, for pumping upwardly sucked water from below;
A plurality of second pumps arranged above the plurality of first pump casings, having a second pump casing and a second impeller fixed to the main shaft, and pumping downwardly sucked water from below. When,
From the first pump at the uppermost stage to the second pump at the uppermost stage, covering the outer circumferences of the plurality of first pump casings and the plurality of second pump casings and around the second pump casing. A first flow passage that flows upward and a second flow passage that flows downward from the second pump in the lowest stage to the secondary side are formed around the first pump casing. A flow channel casing,
The water supply device according to claim 1, further comprising: