JP5033460B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device.

  Operation control of a conventional pump device will be described with reference to FIG.

  When the conventional pump device opens the faucet at T1 and starts using water from the standby state, the water stored in the pressure tank flows out, and the detected pressure of the pressure sensor provided in the pump device is (c). The pump discharge pressure gradually decreases as shown in (b). As a result, the operation of the pump is started when the operation start pressure T2 is reached. The pressure detected by the pressure sensor also decreases according to the opening of the faucet, that is, the amount of water used, and the motor speed is increased by the speed control device, and the pump device is operated while keeping the discharge pressure constant. Yes.

  When the amount of water used is reduced at T3, the pressure detected by the pressure sensor increases, so that the number of rotations of the motor is reduced, and similarly the discharge pressure of the pump device is kept constant. I'm driving. Similarly, when the amount of water used increases again at T4, even when the amount of water used becomes constant at T5, the number of rotations of the motor is changed according to the pressure detected by the pressure sensor according to each situation, and the pump device The discharge pressure is constant. The pump device is repeatedly controlled as described above.

Then, when the water tap is closed and the use of water is finished at T6, the motor enters the stop determination region, and after the motor speed is slightly lowered at T7 to determine whether or not the water is used, the motor is switched between T8 and T9. The rotation speed is kept constant, and during this time, it is confirmed that the pressure detected by the pressure sensor does not change in the decreasing direction, and the pump device is stopped at T9 and enters a standby state. Patent Document 1 like this
(Japanese Unexamined Patent Application Publication No. 2004-116311).

Japanese Patent Application Laid-Open No. 2004-116311

  In the thing of the said patent document 1, since it was set as the operation control which minimizes the pressure fluctuation in a faucet in consideration of the improvement of the convenience at the time of a customer's use of water, from pump stop pressure to pump start pressure The pressure difference ΔPz is reduced. Therefore, for example, when there is a slight water leak in the discharge-side piping from the pump device, the pump device may frequently start and stop even when the customer is not using water. Therefore, the amount of power consumption increases and the electricity bill increases, and the automatic air replenishment device that replenishes the air in the pressure tank every time it starts and stops operates, so it becomes over-air and sneezes in the initial stage of water use. It is in a state where water and air are mixed, making it unusable. Further, the pump head portion becomes high temperature, and the water seal portion is deteriorated to cause water leakage.

  An object of the present invention is to solve the above-mentioned problems and to provide a pump device that is easy to use by suppressing frequent start and stop of the pump.

  In order to achieve the above object, a feature of the present invention is that a pump unit having a rotatable impeller in a casing, a motor for rotating the impeller, and water pressurized by the pump unit are stored. And a pressure sensor that detects a pressure in the pressure tank, and a control device that controls the motor based on a detection signal of the pressure sensor, wherein the control means includes the pressure sensor. When the detected pressure value Ps reaches the first set pressure P1 and the detected pressure value Ps no longer changes, the motor is stopped, and when a predetermined time elapses after the stop, the motor is restarted and the detected The control is to stop the motor when the pressure value Ps reaches a second set pressure P2 (P1 + ΔP) that is higher than the first set pressure P1.

  According to the present invention, it is possible to provide a pump device that is easy to use by suppressing frequent start and stop of the pump.

In order to achieve the above object, a feature of the present invention is that a pump unit having a rotatable impeller in a casing, a motor for rotating the impeller, and water pressurized by the pump unit are stored. And a pressure sensor that detects a pressure in the pressure tank, and a control device that controls the motor based on a detection signal of the pressure sensor, wherein the control means includes the pressure sensor. the detected pressure value Ps reaches the first set pressure P1, and stops the motor when the detected pressure value Ps is no longer observed changes, to restart the motor to the lapse of a predetermined after stopping time, further wherein The control is to stop the motor after a predetermined time (ΔT) has elapsed since the motor was restarted .
In order to achieve the above object, a feature of the present invention is that a pump unit including a rotatable impeller in a casing, a motor for rotating the impeller, and water pressurized by the pump unit are provided. In a pump device comprising a pressure tank for storing water, a pressure sensor for detecting a pressure in the pressure tank, and a control means for controlling the motor based on a detection signal of the pressure sensor, the control means includes the When the detected pressure value Ps of the pressure sensor reaches the first set pressure P1 and the detected pressure value Ps no longer changes, the motor is stopped, and when a predetermined time has elapsed after the stop, the motor is restarted. Further, when the detected pressure value Ps reaches a second set pressure P2 (P1 + ΔP) that is higher than the first set pressure P1, or when the motor is restarted at a predetermined time. ([Delta] T) to reach either is to control so as to stop the motor.

  First, an outline of the pump device of the present invention will be described with reference to FIGS.

  The pump device is arranged on the pressure tank 1, the control board 3 on which the speed control device for changing the number of rotations of the motor 2 and the motor 2 arranged on the pressure tank 1 is mounted, and the motor 2. The operation board 4 capable of switching the display of the discharge pressure value of the pump and the setting of the operating pressure is connected to the control board 3 (control means) via a communication line, and the pump cover 10 covers them.

  The pump unit 15 includes an impeller 16, a casing 17 in which the impeller 16 is placed, and a casing cover 18 that closes the front surface of the casing 17. This pump is called a Wesco pump, and has a suction port 17 (a) and a discharge port 17 (b) in the casing 17. In addition, although description of this invention illustrates the Westco pump which is a typical pump, this invention is not limited to a Westco pump.

  An air-water separation chamber 19 is provided on the upper part of the pump unit 15. The steam-water separation chamber 19 is disposed so as to communicate with the inlet of the pressure tank 1, and is fixed to the pump unit 15 with screws or the like. The suction chamber 20 communicating with the suction flow path is provided with a check valve 21. The check valve 21 allows water to flow from the suction port side to the casing 17 side, but operates to prevent reverse flow. The suction joint 22 of the suction channel is attached to the pressure tank 1.

  On the other hand, a discharge flange 6 for connecting a pipe is provided on the side surface of the pressure tank 1 and is provided to feed the pumped and pressurized water to the faucet.

  A screw-type priming water supply plug 23 is provided in the upper part of the steam / water separation chamber 19. The priming water supply plug 23 is removed to supply priming water.

Next, the control circuit of this embodiment will be described with reference to FIG. FIG. 6 is a control block diagram according to one embodiment of the present invention. The control board 3 is connected to a microcomputer 30 that calculates various input information and outputs a control signal, a speed control unit 31 that is connected to the microcomputer 30 and controls the rotation speed of the motor 2, and the motor 2 and the power source 40. A terminal portion 32 is provided. A switch 50 opens and closes the circuit of the motor 2. Furthermore, the pressure sensor 5 and the operation board 4 are connected to the microcomputer 30. The operation board 4 is used to input pump installation conditions.

  The operation of the pump device will be described. The pump device is operated by operating the motor 2. First, the self-priming operation is performed, and after the self-priming operation is finished, the pumping operation is started.

  In the self-priming operation, the priming water in the air / water separation chamber 19 is recirculated from the casing discharge port 17 (b), and the air is discharged from the discharge nipple 24 into the pressure tank 1, and the casing suction port 17 (a ) The upstream air gradually escapes and the water is filled. Then, when the water is fully filled, the self-priming operation ends and the operation moves to the pumping operation.

  In the pumping operation, the sucked-up water is sent out from the discharge pipe through the discharge flange 6. When the flow path connected to the discharge pipe is closed in the pumping operation, the pressure on the downstream side from the discharge pipe increases. Normally, the pressure sensor 5 is activated and the operation of the motor 2 is stopped.

  Next, the operation control of the present invention will be described with reference to the charts of FIGS. In the present invention, the control is the same as the conventional control until the pump is operated, and then stopped to reach a standby state.

  When the faucet is opened at T1 and water is used from the standby state, the water stored in the pressure tank 1 flows out, and the detected pressure of the pressure sensor 5 provided in the pump device is as shown in (c). , And the pump discharge pressure gradually decreases as shown in (b). As a result, the operation is started when the operation start pressure T2 is reached. The detected pressure of the pressure sensor 5 also decreases according to the opening of the faucet, that is, the amount of water used, and the number of revolutions of the motor 2 is increased by a command from the speed control unit 31 to keep the discharge pressure of the pump device constant. While driving.

  When the amount of water used is reduced at T3, the detected pressure of the pressure sensor 5 rises, so the number of rotations of the motor 2 is reduced, and similarly the operation is performed while keeping the discharge pressure of the pump device constant. ing. Similarly, when the amount of water used again increases at T4, and when the amount of water used becomes constant at T5, the number of rotations of the motor 2 is changed according to the detected pressure of the pressure sensor 5 according to each situation. The discharge pressure of the apparatus is constant, and the operation is repeated.

  When the water faucet is closed and the use of water is finished at T6, the motor enters a stop determination region, and the motor 2 is slightly reduced at T7 to determine whether or not water is used, and then the motor is driven between T8 and T9. The rotation number of 2 is kept constant, and during this time, it is confirmed that the detected pressure of the pressure sensor 5 does not change in the decreasing direction, and the pump device is stopped at T9 and enters a standby state.

  The operation control of the conventional pump device described above is an operation control that minimizes the pressure fluctuation at the faucet in consideration of the convenience of the customer when using the water, and therefore, from the pump stop pressure to the pump start pressure. The pressure difference ΔPz is reduced. Therefore, for example, when there is water leakage in the discharge side piping from the pump device, the pump device may frequently start and stop even when the customer is not using water. As a malfunction due to this, the electricity bill becomes high, and the automatic air supply device operates every time it starts and stops, so it becomes over air, and water and air called sneezing water are mixed in the initial stage of water use, which makes it easy to use. In some cases, the pump head part became hot and the water seal part deteriorated, leading to water leakage.

  Moreover, since the target pressure and the pump stop pressure are the same pressure, the pressure immediately after the start of water use may be felt weak.

  Next, the improved control when the pump is stopped and started will be described with reference to the chart of FIG.

  From T6 to T9 (pump stop) of FIG. 5 of the present invention, the description of the same control as T6 to T9 of FIG. 4 of the conventional example is omitted. In FIG. 4 of the conventional example, when the pump was stopped at T9, it was in a standby state for the next water use.

  In the present invention, after the pump is stopped at T9, the motor 2 is restarted at T10 several seconds after T9 without entering the standby state as in the conventional example.

  After the restart, the detected pressure value Ps of the pressure sensor 5 reaches a pressure higher than the target pressure P1 (first set pressure), that is, the pressure P2 (second set pressure) increased by ΔP from the target pressure P1 (P1 + ΔP). The motor 2 is stopped and the stop control is entered to enter a standby state at T11 corresponding to the time point.

  Next, when the faucet is opened at T12 from the operation standby state and water is used, the detected pressure Ps of the pressure sensor 5 is gradually increased as shown in (c) and the pump discharge pressure Pd is gradually increased as shown in (b). descend. As a result, the operation is started when the operation start pressure T13 is reached. In the conventional example, the operation is started at the target pressure P1 immediately after the start of operation. However, in the present invention, the number of revolutions of the motor 2 is once increased, and the detected pressure value Ps of the pressure sensor 5 is increased by ΔP from the target pressure P1 for a certain time ΔT. The start-up control is set to operate as follows.

  According to the control of the present invention, the pressure difference ΔPx from the pump stop pressure Pa to the pump start pressure Pb can be made larger than the pressure difference ΔPz in FIG. 4 of the conventional example. Can be prevented. Therefore, the electricity bill can be suppressed, and the problem that the sneezing water and the pump head portion become high temperature is eliminated.

  Furthermore, since the pressure immediately after the start of water use is high, usability is also improved.

In this embodiment, the pressure P2 is increased (P1 + ΔP) by ΔP from the target pressure P1.
Although the motor 2 is stopped at T11 corresponding to the time when (second set pressure) is reached, the stop control is entered into the standby state, but is not limited to this.

For example, after the restart of T10, the motor 2 may be operated for a predetermined time (ΔT) and stopped. Further, when the detected pressure value Ps of the pressure sensor 5 is increased by ΔP from the target pressure P1 (first set pressure) or when ΔP is not increased, the motor 2 may be stopped after a predetermined time ΔT has elapsed. In this case, the motor 2 stops when the predetermined time ΔT elapses before the detected pressure value Ps reaches the target pressure P1, and the detected pressure value Ps becomes the target pressure P1 before the predetermined time ΔT elapses after the motor 2 is restarted. When the value reaches, the motor 2 stops.

It is a longitudinal cross-sectional view of the pump apparatus which concerns on one Example of this invention. It is a right view of FIG. It is a top view of the state which removed the pump cover of FIG. It is the chart which showed the operation control of the prior art example in time series. It is the chart which showed operation control concerning one example of the present invention in time series. It is a control block diagram of the pump apparatus which concerns on one Example of this invention.

Explanation of symbols

1 Pressure tank 2 Motor 3 Control board 5 Pressure sensor 15 Pump part

Claims (2)

A pump unit including a rotatable impeller in a casing, a motor that rotates the impeller, a pressure tank that stores water pressurized by the pump unit, and a pressure sensor that detects a pressure in the pressure tank And a pump device comprising control means for controlling the motor based on a detection signal of the pressure sensor,
The control means includes
The motor is stopped when the detected pressure value Ps of the pressure sensor reaches the first set pressure P1 and the detected pressure value Ps no longer changes, and the motor is restarted when a predetermined time elapses after the stop. The pump device is further controlled to stop the motor after a predetermined time (ΔT) has elapsed since the motor was restarted . A pump unit including a rotatable impeller in a casing, a motor that rotates the impeller, a pressure tank that stores water pressurized by the pump unit, and a pressure sensor that detects a pressure in the pressure tank And a pump device comprising control means for controlling the motor based on a detection signal of the pressure sensor,
The control means includes
The motor is stopped when the detected pressure value Ps of the pressure sensor reaches the first set pressure P1 and the detected pressure value Ps no longer changes, and the motor is restarted when a predetermined time elapses after the stop. Furthermore, the detected pressure value Ps reaches a second set pressure P2 (P1 + ΔP) that is higher than the first set pressure P1, or reaches a predetermined time (ΔT) after restarting the motor. The pump apparatus characterized by controlling to stop.

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