pump device
A pump device and drive device technology, which is applied in pump control, non-variable pumps, machines/engines, etc., and can solve problems such as the inability to adjust the target pressure control curve
Active Publication Date: 2017-03-08
EBARA CORP
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0015] However, in the water supply device described in Patent Document 1, the target pressure control curve is manually selected and switched manually, and the selection and switching of the target pressure control curve are not performed automatically.
In addition, since the target pressure control curve to be used is selected from a plurality of target pressure control curves stored in the control unit in advance, the target pressure control curve itself cannot be adjusted according to the operating conditions of the water supply device.
Method used
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Embodiment Construction
[0062] Hereinafter, embodiments of the present invention will be described with reference to the drawings. image 3 It is a schematic diagram showing a water supply device which is an example of a pump device according to an embodiment of the present invention. Except for the control unit 40, image 3 The water supply device 1 shown has the figure 1 The water supply device 100 shown has the same structure, and thus the repeated description thereof is omitted. Figure 4 It is a graph showing a target pressure control curve according to an embodiment of the present invention. in Figure 4 Here, the vertical axis represents the discharge side pressure (head) of the pump 2 and the horizontal axis represents the flow rate of water discharged from the pump 2.
[0063] in Figure 4 Here, PA is the discharge side pressure of the pump 2 at the maximum flow rate, and PB is the discharge side pressure of the pump 2 when the pump 2 is in the cut-off operation (that is, when the flow rate is 0...
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The present invention relates to a pump apparatus which can be suitably used as a water supply apparatus for supplying water to a building. The pump apparatus includes: a pump (2); a motor (3) configured to drive the pump (2); a driver (20) for driving of the motor (3) at variable speed; and a controller (40) configured to control the driver (20) so as to start the pump when the discharge-side pressure of the pump (2) decreases to a predetermined starting pressure and to keep the discharge-side pressure equal to a target pressure on a target pressure control curve. The controller (40) determines a lowest value PL of the discharge-side pressure after the pump (2) is started, calculates a difference ”P1 between the lowest value PL and a predetermined lower limit Pz of the discharge-side pressure, and corrects the target pressure control curve R based on the difference ”P1.
Description
Technical field [0001] The present invention relates to a pump device that transports liquid, and more particularly to a pump device that is preferably used as a water supply device for supplying water to a building. Background technique [0002] Pump devices are widely used as water supply devices for supplying water to buildings. figure 1 It is a schematic diagram showing a normal water supply device. Such as figure 1 As shown, the suction port of the water supply device 100 is connected to a water pipe 4 or a water receiving tank (not shown) via an introduction pipe 5. A water supply pipe 7 is connected to the outlet of the water supply device 100, and the water supply pipe 7 communicates with water supply appliances (for example, water taps) on each floor of the building. The water supply device 100 pressurizes the water from the water pipe 4 or the water receiving tank, and then supplies it to each water supply apparatus of the building. [0003] The water supply device 100 ...
Claims
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IPC IPC(8): F04D15/00
CPCF04D15/0066F04D15/029
Inventor 唐木亮太郎桧垣展宏原田阳介宫内祥子小西康贵金田一宏手岛友治
Owner EBARA CORP