JPH0437911A - Water supply controller - Google Patents

Abstract

PURPOSE:To optionally adjust a control range for water supply according to the water using condition by opening an excessive water return pipe when the internal pressure of this pipe exceeds a prescribed level, and stopping the operation of a pump when the excessive water to be returned reaches a fixed flow rate. CONSTITUTION:The starting pressure of a variable pressure switch 7, the closing amount of a flow rate control valve 9, and the starting water volume of a flow switch 10 are set each optional level. When the internal pressure of a water pipe 2 detected by the switch 7 is lower than a set level, a pump 1 is started. Then the excessive water is returned to the intake side of the pump 1 through an excessive water return pipe 3 when the internal pressure of the pipe 2 increases and the setting conditions of the valve 9 are satisfied. The volume of the excessive water to be returned increases in response to the internal pressure of the pipe 2 increases. The operation of the pump 1 is stopped in several seconds after the volume of the excessive water reaches the water volume detected by the switch 10. As a result, the water supply is freely controlled in accordance with the water using conditions despite the use of pumps of different type.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a water supply control device.

[Prior art and its problems] The conventional water supply control method is described with reference to Figure 2.
' is detected by pressure switch 7', and this is set to 0.
The pump 1' is started and stopped by switching to the N-OFF signal. Since this system is controlled by pressure fluctuations within the lift pipe 2, a large-capacity pressure tank T is required, and usage conditions and pump conditions are restricted by the control range of the pressure casu inochia'.

In addition, referring to Fig. 3 for other control methods, the pumping pipe 2
The pressure in the pump 1' is detected by the pressure casu inochia', the flow rate is detected by the flow rate sensor 10', and the signal is switched to 0N-OFF to start and stop the pump 1'.In this method, the flow rate sensor 10' is always It is attached to the water part,
It is necessary to consider the chipping property. Furthermore, if the water flow exceeds the flow rate that is suitable for the pipe line within the device, the sensor itself may be damaged, so the pump conditions used are restricted.

In any of the above cases, when the pump is stopped, the pump operates in a fully closed state for several seconds, generating vibration and noise. Furthermore, the equipment for carrying out this method has a pump-integrated unit configuration, and is subject to restrictions on installation conditions.

[Objectives of the Invention] The objects of the present invention are to be able to adjust the control range arbitrarily depending on the usage conditions, to be able to control water supply even when using different types of pumps, to be able to increase the durability of the sensor, and to be able to fully control the pump. An object of the present invention is to provide a water supply control device that can avoid closed operation and is not restricted by installation conditions.

[Structure of the Invention] The water supply control device according to the present invention includes a variable pressure switch that starts the pump when the pressure inside the pipe is equal to or lower than a preset constant pressure, which is attached to the water supply pipe led out from the discharge side of the pump. A variable secondary flow rate system that opens a surplus water return pipe that branches from the water supply pipe and connects from the discharge side to the suction side of the pump when the internal pressure of the pipe exceeds a preset constant pressure. It is equipped with a regulating valve and a flow switch that stops the pump when the returned surplus water reaches a certain flow rate.

[Function] Setting the starting pressure of the variable pressure switch attached to the water supply pipe, the opening degree of the variable secondary flow regulating valve attached to the surplus water return pipe, and the starting water amount of the flow switch to arbitrary values. .

The pressure inside the water supply pipe is detected by a variable pressure switch, and if it is lower than the set value, the pump is activated.

When the pressure inside the pipe increases to meet the setting conditions of the variable secondary flow rate regulating valve, the surplus water is returned to the suction side of the pump through the surplus water return pipe. The amount of returned surplus water increases in correlation with the rise in pressure in the water supply pipes, and once the amount of water detected by Flowsy Sochi is reached, the pump will stop a few seconds later.

[Example] In FIG. 1 of the example, 1 is a pump, 2 is a water supply pipe led out from the discharge side of pump 1, and 3 is a branched water supply pipe 2 and connected from the discharge side of pump 1 to the water supply side. 4 is a quick-closing check valve, 5 is an accumulator, 6 is a needle valve, 7 is a variable pressure switch, 8 is a control panel, 9 is a variable secondary flow rate adjustment valve, and 10 is a flow switch. be.

The starting pressure of the variable pressure switch 7, the opening degree of the variable secondary flow rate regulating valve 9, and the starting water amount of the flow switch 10 are set to arbitrary values, respectively, and the variable pressure switch 7 detects the pressure inside the water supply pipe 2. If the value is lower than the set value, the pump 1 is activated and the water from the supply source 11 is sent through the water supply pipe 2 to a predetermined supply destination. When the pressure in the water supply pipe 2 increases due to the idle state of the tip valve 6 and the setting conditions of the variable secondary flow rate adjustment valve 9 are met, the surplus water passes through the surplus water return pipe 3 and flows to the suction side of the pump l. It starts being sent back. As the pressure inside the water supply pipe 2 further increases, the returned surplus water 11 increases, but when this reaches the amount of water detected by the flow switch 10, the pump 1 stops after a few seconds.

Since the variable secondary flow rate regulating valve 9 can adjust the residual water flow rate according to pressure, it is possible to balance it with the flow switch 10 according to the required pressure, and it is possible to perform control according to the required pressure. It is. Furthermore, by detecting the flow rate of surplus water, it can be applied to controlling the number of water supply pumps and variable speed operation of pumps.

[Effects of the Invention] In the device of the present invention, by adjusting the variable secondary flow 1m regulating valve 9, it is possible to freely control the water supply according to the usage conditions, and even when different types of pumps are used, the water supply can be controlled. It can be made possible. Furthermore, the detection of the flow rate of residual water by the flow switch 10 is performed near the pump stop condition, and no water flows through the residual water return pipe 3 during normal operation, so the durability of the flow switch 10 is improved. . During the stop condition, surplus water is returned by the surplus water return pipe 3, so that the pump 1 is not operated in a fully closed state, and vibration and noise are eliminated. Furthermore, the device of the present invention does not necessarily have to be configured as a unit with an integrated bomb, but can be installed separately, and has the advantage that it is less subject to restrictions on installation conditions.

[Brief explanation of drawings]

FIG. 1 is a system diagram of the water supply control device of the present invention, and FIGS. 2 and 3 are system diagrams of conventional water supply control devices. 1... Pump, 2... Water supply pipe, 3... Surplus water return pipe, 7... Variable pressure switch, 9... Variable secondary flow rate adjustment valve, 10...・Flow switch.

Claims (1)

[Claims] A water supply pipe (2) led out from the discharge side of the pump (1),
A variable pressure switch (7) is installed that starts the pump (1) when the pressure inside the pipe is below a preset constant pressure, and it branches from the water supply pipe (2) to the suction side from the discharge side of the pump (1). The connected surplus water return pipe (3) is provided with a variable secondary flow rate regulating valve (9) that opens the surplus water return pipe (3) when the pressure inside the pipe exceeds a preset constant pressure.
) and a flow switch (10) that stops the pump (1) when the returned surplus water reaches a certain flow rate.