JPH053368U - Excessive flow prevention system - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent excessive flow of water and prevent insufficient water supply pressure. [Structure] A flow rate measuring device and a flow rate controlling device are installed in series in the water pipe. A control device for operating the flow rate control device based on the signal from the flow rate measuring device is provided. When the flow rate measured by the flow rate measuring device exceeds a predetermined limit flow rate, the control device actuates the flow rate control device to limit the flow rate to the limit flow rate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a water flow control system, and more specifically, to a large-scale water supply system. When the amount of water used exceeds the specified limit flow rate in the equipment, Overflow prevention that limits the amount of water and stabilizes the water supply without impairing practical convenience Regarding the system.

[0002]

[Prior art]

  The water supply system is originally a system that supplies tap water to each household through a water supply pipe that branches from the distribution pipe. It is. In this case, the water supply system from the water pipe to the indoor water use equipment should be connected directly to the water pipe. It is usually tied.

[0003]   On the other hand, if demand is high, such as in an apartment or a general building, Install a water receiving tank in the middle of the water pipe, once receive water in the water receiving tank, and then pressurize the pump again. A so-called receiving tank system for supplying water has been adopted.

[0004]   However, in the receiving tank method, tap water is released to the atmosphere, and water remains inside the tank. Since it is stored, the water quality will deteriorate in the tank a little and hygiene problems often occur. Alive Therefore, in recent years, the water receiving tank has been removed and the water distribution pipe is The method of directly connecting to has come to be adopted.

[0005]   In this case, when designing the water supply device such as the water supply pipe, it Set the capacity of the water supply system to correspond to the maximum amount of water used, so-called peak flow rate To do. By the way, this peak flow rate is simply combined with the maximum water consumption of all water-using equipment. If you set the capacity of the water supply device according to the amount calculated as It is extremely rare for all such devices to be used in maximum usage, so As a water supply device, it will be a facility with excessive capacity. Therefore, all water use For example, 80% of the total sum of the maximum amount of water used by the equipment is set as the peak flow rate It is customary to design the water supply system according to the peak flow rate.

[0006]

[Problems to be solved by the device]

  By the way, in the case of direct water supply, since the water supply device is literally directly connected to the distribution pipe, The amount of water used directly affects the condition inside the water distribution pipe, and the larger the amount of water used, the more The degree is also increasing, and in extreme cases there may be a situation where the water supply pressure is insufficient on the downstream side of the distribution pipe. It

[0007]   Therefore, set the peak flow rate as described above, and design the water supply facility based on this. Then, a lot of water-using equipment is used at one time, and its usage exceeds the above-mentioned peak flow rate. If such a situation occurs, such a situation of insufficient water supply pressure may occur. It

[0008]   By the way, when using water in water-using equipment, The amount of water is sufficient if the conditions are satisfied, and the flow rate per unit time is often not so important.

[0009]   Therefore, the present invention provides the water supply itself when the amount of water used exceeds a predetermined limit flow rate. Limit its flow rate without impairing practical convenience, while lack of water supply pressure Providing an overflow prevention system that can prevent such situations and stabilize the water supply It is the one to try.

[0010]

[Means for Solving the Problems]

  In order to achieve the above object, the present invention provides a flow rate measuring device arranged in a water pipe. A flow rate control device arranged in the water pipe in series with the flow rate measurement device, and the flow rate A control device for operating the flow control device based on a signal from the measuring device. To provide an excessive flow prevention system. The control device uses a flow measuring device. When the measured flow rate exceeds the specified limit flow rate, the flow rate control device is activated. To limit the flow rate to the limited flow rate.

[0011]

【Example】

  An embodiment of the present invention will be described below with reference to the drawings.

[0012]   FIG. 1 is a block diagram showing a schematic structure of the present invention.

[0013]   In the figure, 1 is a water distribution pipe, which flows from the upstream side to the downstream side in the direction of the arrow in the figure. . 2 is for water supply to all the apartments 3 that branch from the water pipe 1 at the position shown in the figure It is a water supply pipe, and an excessive flow prevention system 10 according to the present invention is provided in the middle of the water supply pipe 2. is set up.

[0014]   The excessive flow prevention system 10 measures the flow rate in the water supply pipe 2 and outputs a corresponding signal. And a flow rate measuring device 12 which emits a signal, and which is arranged on the downstream side of the flow rate measuring device 12. A valve device 14 as a flow rate control device for controlling the flow rate, and the valve device 14 Receives a signal from the actuator 16 for moving and the flow rate measuring device 12, The actual flow rate measured is compared to a predetermined limit flow rate, and the actuation is based on the result. The controller 18 that outputs a signal to the data 16 and controls the operation of the valve device 14 I have it.

[0015]   The flow rate measuring device 12 measures the differential pressure between the upstream side and the downstream side of the measuring device 12. A form in which the controller 18 measures the flow rate and calculates the flow rate from this differential pressure, Detect the pressure at position 12 and detect excessive flow rate by pressure drop above a specified value. There are various types, such as a known type or a type that directly detects the flow rate itself such as an electromagnetic flow meter. The type can be adopted.

[0016]   The valve device 14 is not limited to any special type, and may be a globe valve or a sluice. It is also possible to use valves, ball valves, butterfly valves and even pressure reducing valves.   The actuator 16 is a vertical movement type or a rotation type, etc., depending on the type of the valve device 14. It can be arbitrarily selected.

[0017]   FIG. 2 is a cross-sectional view showing some components showing a specific embodiment of the overflow prevention system. FIG.

[0018]   The flow rate measuring device 12 is provided with an orifice or a Venturi tube 21, The pressure at the table is measured by pressure sensors 23 and 25, respectively. The output is input to the controller 18. The controller 18 was previously measured Since the relationship between the differential pressure and the flow rate is stored, the signals from the pressure sensors 23 and 25 are Based on this, the flow rate is immediately calculated.

[0019]   When it is detected that the flow rate exceeds the predetermined limit flow rate, the controller 18 activates. A signal is sent to the chute 16 to activate the valve device 14 to throttle the flow rate to the restricted flow rate. In this embodiment, a globe valve is used as the valve device 14, A vertically moving type is used as the eater 16.

[0020]   When the actuator 16 receives a signal from the controller 18 to close the valve, Operate the valve device 14 in the closing direction and set it at the opening position corresponding to the limited flow rate. The first limit switch (not shown) to the switch lever (not shown) of the valve device 14. The valve device 14 is stopped and held in that position.

[0021]   Flow rate detection continues after that, and when it is detected that the flow rate is below the limit flow rate. , The controller 18 actuates a signal to open the valve device 14 in the opposite direction. Send it to computer 16. The switch lever of the actuator 16 has another predetermined opening degree. The valve device 14 is opened until the second limit switch set in the position is closed. It

[0022]   In addition, the limit flow rate set in the controller can be changed. Appropriate measures can be taken during the period, such as reducing the flow restriction compared to other seasons.

[0023]   Further, in the above embodiment, when the flow rate control device is installed on the downstream side of the flow rate measurement device, However, these arrangements may be reversed.

[0024]

[Effect of device]

  As is clear from the above description, according to the present invention, a water supply device of a relatively large scale is provided. Automatically controls the amount of water used when an excessive amount of water is used. Limiting the flow rate to prevent problems such as insufficient water supply pressure due to excessive flow in advance On the other hand, when the flow rate is less than the limit flow rate, water can be supplied without any limitation. still, Even if the flow rate is limited, the decrease in the flow rate per unit time for each water using device It is a small amount, and practical convenience is not impaired.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an excessive flow prevention system according to the present invention.

FIG. 2 is a partial cross-sectional view of a specific embodiment of the present invention.

[Explanation of symbols]

1: Water distribution pipe 2: Water supply pipe 12: Flow rate detection device 14: Valve device 16: Actuator 18: Controller

Claims (2)

[Scope of utility model registration request] 1. A flow measuring device disposed in a water pipe,
A flow rate control device arranged in the water supply pipe in series with the flow rate measurement device, and a control device for operating the flow rate control device based on a signal from the flow rate measurement device,
An excessive flow rate prevention system for limiting the flow rate to the limited flow rate by operating the flow rate control apparatus when the flow rate measured by the flow rate measurement apparatus exceeds a predetermined limited flow rate. 2. The excessive flow prevention system according to claim 1, wherein the flow rate measuring device measures a differential pressure between an upstream side and a downstream side of the flow rate measuring device and calculates the flow rate from the differential pressure.