JP3070752B2 - Operating method of pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to automatic start / stop operation or start / parallel operation start / parallel operation cancellation / operation stop, etc., with opening and closing of a faucet. According to the operating method of the pump device to be performed, the pump that prevents the shut-off operation that is continuously operated with the faucet closed and displays the fact in the event of an abnormality to allow quick maintenance and a pump that protects the pump device. The present invention relates to a method for operating the device.

[Conventional technology]

Conventional pump devices generally start or stop operation by using a pressure switch or a combination of a pressure switch and a flow rate switch. The pressure switch opens and closes the contacts by the difference between the pump device internal pressure and the spring force.
It is natural that the operating state of the pump cannot be grasped. To compensate for this, a pressure gauge is fixed to the water passage. In addition, when the pump stop function is lost due to the failure of the pressure switch, the pump is operated in a closed circuit with the faucet closed, that is, the pump is closed, the pumping energy is converted to heat, and the inside of the pump is heated to high temperature and pressure. This is dangerous and promotes the deterioration of the components.

In addition, when the operation is performed in a state where air is sucked from the suction pipe side connecting the pump device and the water receiving tank, the so-called idling operation also causes problems such as heat and accelerated deterioration of parts.

It should be noted that there is a similar problem in a pump device constituted by a combination of a pressure switch and a flow rate switch as described in Japanese Patent Publication No. 1-29998.

The above-mentioned prior art has a problem that a pressure gauge is provided for grasping an operation state of the pump, and a high-strength material that can withstand abnormal operation is inevitably expensive.

[Problems to be solved by the invention]

An object of the present invention has been made in view of the above-described problems, and prevents a shut-off operation in which the water faucet is continuously closed in a state where a water faucet is closed due to entry of foreign matter into the pump or the like. An object of the present invention is to provide a method of operating a pump device that can notify a user.

[Means for solving the problem]

In order to achieve the above object, the present invention is characterized in that at least two or more pumps are provided on a common bed to supply water to a faucet, a pressure sensor for detecting an internal pressure of the pump, and a motor for driving the pump. A pump device having a motor operation detection sensor for detecting an operation state of the pump, wherein the motor operation detection sensor detects that the pump is operating while the faucet is closed, and further comprises the pressure sensor If the pump pressure smaller than the pump stop pressure value during normal operation is continuously detected even after the lapse of a predetermined time, or if the pump pressure equal to or lower than the minimum pressure value during normal operation has passed a predetermined time by the pressure sensor, If the detection continues, drive another motor and pump in place of the currently running motor and pump. In an operating method of the pump apparatus that.

Further, the feature of the present invention is that, in addition to the first method, the motor operation detection sensor detects that the pump is operating while the faucet is closed, and furthermore, the pressure sensor If the pump pressure smaller than the pump stop pressure value during normal operation is continuously detected even after the lapse of a predetermined time, or if the pump pressure equal to or lower than the minimum pressure value during normal operation has passed a predetermined time by the pressure sensor, In the case where the pressure is continuously detected, there is an operation method of the pump device that switches the pressure value displayed at the time of normal operation to the display indicating the abnormal operation.

[Action]

According to the present invention, when the water tap is closed, the motor operation detection sensor detects that the pump is operating, and the pressure sensor detects a pump pressure smaller than the pump stop pressure value during normal operation for a predetermined time. If the detection is continued after the elapse of time, or if the pressure sensor detects the pump pressure equal to or lower than the minimum pressure value during normal operation after the predetermined time has elapsed, the motor and the pump that are currently operating The pump is operated in an abnormal state of the pump, such as shut-off operation due to foreign matter entering the pump, or idle operation due to suction of air from the connection, etc. Can be prevented from continuing
The service life of the pump is also improved.

Further, according to the present invention, in addition to the above, since the pressure value displayed during normal operation is switched to a display indicating abnormal operation, it is possible to inform the user of an abnormal state of the pump, and to improve maintenance. Convenience can be improved, including:

〔Example〕

 Hereinafter, the present invention will be described with reference to FIGS.

In FIG. 1, on a common belt 1 of the pump device,
Two pump heads 2, 3 are attached, and each pump head 2, 3 is connected to a water tank 6 via suction pipes 4, 5. Downstream sides of the pump heads 2 and 3 are a merging pipe 7 and a discharge pipe 8
Is connected to each faucet 9. Confluence pipe 7
A pressure sensor 10 and a pressure tank 11 are attached to the upper part of the box. A control box 12 is mounted on the common bed 1.

On the surface of the control box 12, a switching switch 13 for performing an automatic-off-manual switching and a selection switch 14 for performing a selection between the first unit, the second unit and the alternation are mounted so as to be operated from the outside. A power lamp 15 for displaying whether power is supplied or not, and an operation lamp 16 for displaying which of the first and second units, that is, which pump heads 2, 3 are operating, are attached. Further, the control box 12 is provided with a transparent window 18 at a position where a numeric display element 17 for displaying the pump internal pressure and the abnormal state can be seen, which will be described in detail later.

As shown in FIG. 3, the control box 12 includes a terminal block 21 for connecting the power supply 19 and the motor 20, a switch 22 for opening and closing the circuit of the motor 20, and a microcomputer (FIG. 3) for determining and outputting based on various inputs. Substrate with microcomputer (not shown) 23
And so on. The input information to the microcomputer-attached substrate 23 includes a pressure sensor 24 that outputs a value that can be read by formulating the pressure inside the pump or a combination of straight lines, and a current sensor 25 that inputs the operating status of the pump via a current flowing through the motor 20. The output information from the microcomputer-equipped board 23 includes the on / off of the switch 22 that opens and closes the circuit of the motor 20, the pump internal pressure, and the numeric display element 17 based on the information from the pressure sensor. And so on.

Next, the operation will be described in detail based on a water volume-pressure characteristic diagram of the pump device shown in FIG. When the faucet 9 opens, the internal pressure of the pump gradually decreases. When the H _ON point is reached, it is input to the microcomputer-equipped substrate 23 via the pressure sensor 24, a pump operation command is issued, the switch 22 enters, and the pump starts water supply. When the faucet 9 is closed and the internal pressure of the pump rises to reach the pump stop pressure value H _OFF , a pump stop command is issued in the same manner, and the pump stops.

When a water amount equal to or less than the pump stop pressure value H _OFF is used, the hunting phenomenon occurs because the pump internal pressure repeats H _ON -H _OFF . In order to prevent this, it is common to operate the delay timer when the operation is started after reaching H _ON or after reaching H _OFF .

Therefore, the present pump device operates within the range from the minimum value H _mini of the pump internal pressure to the cutoff pressure H _max when the faucet is fully opened. The pressure during operation is displayed by the numerical display element 17 via the pressure sensor 24 and the microcomputer-attached substrate 23. Since this value can be confirmed from the transparent window 18 on the surface of the control box 12, the operation status can be confirmed at all times. Under this circumstance, if information from the pressure sensor is not entered, it is clear that the pressure sensor path is abnormal, and it is possible to use a numeric display element to notify the user of the abnormality.

If the impeller is clogged with foreign matter or the like during the operation of the pump and the pump stop pressure value H _OFF is not reached, the pump cannot be stopped, the pump continues to operate, and the pump stops operating on a closed circuit with the faucet closed. , The internal pressure of the pump becomes high temperature and high pressure, which is dangerous. in this case,
Since the information from the pressure sensor is _{equal to} or greater than _Htmax and the information from the current sensor can be used to determine that the operation is the shutoff operation, the fact is indicated on the numerical display element that normally displays the pressure value, and the operation is forcibly performed. After stopping, it is possible to switch to the operation of only the normal machine. In addition, when air is sucked from the connection section of the suction pipes 4 and 5, that is, during idle operation, the information from the pressure sensor is smaller than the minimum pressure H _mini during normal operation, and the information from the current sensor. It is possible to determine that the vehicle is idling, so that it is possible to deal with it in the same manner.

In the above description, one numerical display element is used to display both the normal pressure value display and the abnormal display when abnormal, but the same effect can be obtained even if the pressure value display and the abnormal display are separated. Of course. In addition, it is needless to say that the present invention can be applied to a generally used pump, that is, a pump having only one pump head.

〔The invention's effect〕

As described above, according to the present invention, when the water tap is closed, the motor operation detection sensor detects that the pump is operating, and the pressure sensor is smaller than the pump stop pressure value during normal operation. If the pump pressure is still detected even after the predetermined time has elapsed, or if the pressure sensor has been continuously detected by the pressure sensor even if the pump pressure is equal to or less than the minimum pressure value during normal operation after the predetermined time, the current operation is performed. Since the other motor and pump are driven in place of the motor and pump inside, the pump is operated in a shut-off operation due to entry of foreign matter into the pump, etc., or in an idle operation due to suction of air from the connection etc. It is possible to prevent the pump from continuing to operate in the abnormal state, and to prolong the life of the pump.

Further, according to the present invention, in addition to the above, since the pressure value displayed during normal operation is switched to a display indicating abnormal operation, it is possible to inform the user of an abnormal state of the pump, and to improve maintenance. Convenience can be improved, including:

[Brief description of the drawings]

1 is a perspective view showing an embodiment of a pump device according to the present invention, FIG. 2 is a perspective view showing a control box surface viewed from P in FIG. 1, FIG. 3 is a block circuit diagram of the present invention, FIG. 4 is a water amount-pressure characteristic diagram of the present invention. 2,3 ... Pump head, 17 ... Number display element, 20 ... Motor, 24 ... Pressure sensor, 25 ... Current sensor.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigetomo Yoshihara 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Plant of Hitachi, Ltd. (56) References JP-A-59-122791 (JP, A) JP-A-57-8383 (JP, A) JP-A-1-227883 (JP, A) JP-A-62-240488 (JP, A) JP-A-60-155091 (JP, A) JP-A-62-178788 (JP, A) JP-A-55-156283 (JP, A) JP-A-53-49302 (JP, A) JP-A-60-108787 (JP, U) JP-A-59-174608 (JP, U) 2-11515 Kai (JP, U) 1-133139 JP (U, JP)

Claims (2)

(57) [Claims] At least two pumps are provided on a common bed for supplying water to a faucet, a pressure sensor for detecting an internal pressure of the pump, and a motor operation detection sensor for detecting an operation state of a motor for driving the pump. In the pump device having the water faucet closed, the motor operation detection sensor detects that the pump is operating, and the pressure sensor detects a pump stop pressure value during normal operation. If the small pump pressure is still detected after the lapse of the predetermined time, or if the pump pressure is continuously detected by the pressure sensor below the minimum pressure value during normal operation after the predetermined time, the current A pump device characterized in that another motor and a pump are driven in place of the running motor and the pump. Driving method. 2. The pump stop pressure during normal operation according to claim 1, wherein the motor operation detection sensor detects that the pump is operating while the faucet is closed, and the pressure sensor detects the operation. If a pump pressure smaller than the value is continuously detected even after a predetermined time has elapsed, or if a pump pressure equal to or less than the minimum pressure value during normal operation by the pressure sensor is continuously detected after a predetermined time has elapsed, A method of operating the pump device, wherein the pressure value displayed during normal operation is switched to a display indicating abnormal operation.