JPS5927421A - Flow switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flow switch for detecting a small flow rate, and more particularly to a composite type flow switch having a check valve function.

[Technical background of the invention and its problems]

The water pump sends water to a water supply system that supplies water to a predetermined location, and the flow rate in the water supply pipe is detected.
A flow switch is used to accurately control the amount of water delivered. As such a flow switch, one that can accurately detect even a small amount of water flow and drive or stop the pump has been developed (for example, Japanese Patent Laid-Open No. 5
4-65803).

In addition, in normal water supply systems, check valves are installed to protect the pump and piping equipment in order to prevent water hammer, which occurs when the pump stops (2) during a power outage.

Conventionally, such flow switches and check valves have been arranged separately and independently in the water supply pipe, resulting in a narrow piping space and increased costs.

[Purpose of the invention]

The present invention has been designed with these points in mind, and it is an object of the present invention to provide a flow switch having the function of a check valve.

[Summary of the invention]

The flow switch according to the present invention has a large flat/small inlet that is vertically installed in a swinging OT function in a hollow casing that is open at both ends, and a small flat/gut that closes the small inlet. The large flat groove and the small flat groove are movably installed vertically on the downstream side of the flat groove, and the large flat groove and the small flat groove are each biased with springs toward the inlet. It is characterized by the arrangement of a detection switch that detects the oscillating motion of 7.

According to the present invention, a small flow rate can be reliably detected by the oscillating motion of the small flat, and a control 1111 signal for the water supply system can be obtained, and when the pump is stopped, the large flat and the small flat can be rapidly detected. By closing the inlet, it is possible to prevent backflow in the pipe and effectively prevent water hammer.

[Embodiments of the invention]

The implementation of the present invention will be described below with reference to the drawings.

1 and 2 are a front sectional view and a sectional view taken along the line 1--1 in FIG. 1 of a flow switch according to the present invention. In the figure, reference numeral 11 indicates a hollow casing having an inlet 12 and an outlet 13 at both ends, and this hollow casing 1
A flow path 14 is formed in the inside of the fuel cell 1 to communicate the inlet 12 and the outlet 13. A valve seat 15 formed by protruding a part of the inner wall of the casing 11 is provided in the flow passage 14, and a large flat aR is provided so as to come into contact with the valve seat 15.
l(i is placed vertically.

The large flat plate 16 is formed of a web-shaped plate, and has a size that allows the valve seat 15 to be brought into close contact with the flow path 14 to be completely traced. A swing shaft 17 is placed above the valve seat 15.
is rotatably supported by the casing 11 at both ends, and a large flat tJ? l
(The upper part of i is inserted and held in the swing 0T function.

A part of the swing shaft 17 has a large flat/e16 outlet 13.
A spring 18 is wound around the side 16a facing the (downstream side). This spring 18
C. It acts to bias the large flat e 16 toward the valve seat 15. The swing shaft 17 also has a large flat.
The upper ends of a pair of V-bars 19 that contact from the inlet 12 side are fitted to both ends of the housing 16, and the outer il of the casing 11 is fitted.
A handle for rotating the swing shaft 17 is fitted onto one end protruding from the l.

A small inlet 21 with a small diameter is provided in the lower part of the large flat pRl (i), and a small valve seat B is formed at the end of the small inlet 21 facing the outlet 13. .

The small flat A'lA that closes the small inlet 21 in close contact with the small valve seat O is the large flat J? 16 downstream side 1
6a is vertically installed with a 0J swing function. Small Flatspaha is
The upper part is a large flat and is rotatably inserted and held in the swinging bottle fixed on the downstream side 1fia of 16.
Further, it is urged toward the small valve seat 22 by one end of a spring 5 wound around the swing bottle.

A magnet 26 is attached to the lower end of the small flat 8B, and a detection switch such as a reed switch n, which is activated by the swinging motion of the magnet 26, is disposed below the small flat 8B. Reference numeral 28 is a switch case in which the reed switch n is housed.

Next, the operation of this embodiment having such a configuration will be explained.

First, during normal operation, water is supplied to inlet 1 by the water supply pump.
2 and enters the casing 11, the pressure energy of the water pushes the small flat 26 and swings by an angle corresponding to the flow rate. The reed switch 27 is activated, and the fact that water is being fed through the water supply system and its flow rate are detected. If the amount of water supplied increases further, large flats will occur.
The solenoid 16 also swings according to the flow rate. This big flat 9
For example, fli 1986-65803
As in the method disclosed in the publication, by operating a reed switch or visually detecting the flow rate, it is possible to completely detect the flow rate in the water supply system, and it is also possible to control a plurality of pumps. For example, when the demand for water is high and the large flats 16 is oscillating, multiple pumps are operated at the same time, and the demand for water decreases and the large flats 16
When the oscillation stops, run only one pump and stop the rest, and the small flat 1! It is possible to control the operation of all pumps so that they stop operating when the field stops shaking. This reduces pump operating time and
This can improve the durability of the pump and reduce running costs.

Next, when the pump stops due to a power outage, etc., the large flat e16 and then the small flat e16 perform a rapid closing operation due to the urging force of the spring 18 and δ, and before backflow occurs in the pipe, Completely block the flow path. This rapid closing action effectively prevents water hammer. At this time, the reed switch 27 is actuated by the rocking of the small flat 923, and a pump stop signal is generated, and the pump brake is actuated to prevent the pump from reversing.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to easily and accurately detect a small flow rate in a water supply system by the oscillating motion of the small flat. If a detection mechanism is attached, the operation of multiple pumps can be controlled, which provides excellent effects as a water supply system control device. Furthermore, when the pump is stopped, the inlet is quickly closed, preventing backflow in the water supply pipe, and effectively preventing water hammer. Furthermore, a reed switch activated by the swing of the small flasher can also activate the brake of the pump, preventing damage to the pump and piping equipment.

However, the functions of a flow switch and a check valve can be performed by one device, and there is no need to dispose them separately as in the past. Therefore, the piping space is not narrowed and costs can be reduced. Furthermore, since the number of members in the pipe is reduced, pressure loss can be reduced. 1 r: The large flat groove can be swung by the handle attached to the end of the swinging shaft, and the operation of the reed switch 27 can be confirmed, and the large flat groove 7 can be checked for example. If the machine is inoperable, the situation can be confirmed using the handle or the V-par 19, and if the situation is minor, the stuck state can be released using the flange weight and spring force.

In this embodiment, a horizontal type flow switch will be described, but it can also be used as a vertical type by adjusting the biasing force of the spring. The detected flow rate is determined by the size of the inlet, the strength of the spring, the weight of the flan-seven, the position of the detection switch, etc., and can be freely adjusted as desired.

Figures 3 and 4 show a small flat plate used to provide the flow switch according to the present invention with the S function of a slow-closing check valve.
FIG. 9 is a diagram showing an example of No. 9; In this example, large flats,
A needle/pot machine is attached to a swinging bin 32 that swingably holds the small flat 4!31 vertically installed in the R so that the closing operation of the small flat 4!31 is performed slowly. That is, as shown in FIG. 4, a fluid-filled space is formed between the swing bottle 32 and the upper part 311 of the small flat 31 inserted and held therein, and the small flat,
Braking pieces 35 and 36, which project into the space, are arranged and fixed at predetermined intervals on the inner wall of the upper part 31& and the swing bottle 32, respectively.

Therefore, if the small flap 31 is used to attach such a dashpot mechanism 33, when the flow in the pipe is stopped, such as when the pump is stopped, the small flat 31 will close the brake part A, 36. Due to the fluid resistance inside the space, it swings gently and closes the small inlet that penetrates the large flat and the arm.

In this way, the small flat valve 31 can be used as a slow-closing check valve, and water hammer can be effectively prevented. Since the pressure change in the loose check 9F is relatively small, it is particularly effective when used in a water supply system with a large flow rate.

In addition, if the small flat arm 31 for the quick-closing check valve mentioned above and the small flat arm 31 for the slow-closing check valve can be replaced with the same large flat, they can be changed depending on the application. In addition to making it possible to use different flow switches, it is also possible to reduce manufacturing costs.

[Brief explanation of drawings]

Fig. 1 is a front cross-sectional view of the flow switch according to the present invention, Fig. 2 is a cross-sectional view of the flow switch shown in Fig. The small flats shown in Figure 3
FIG. 11...Casing, 12...Inflow port, 13...
Outlet, I4...Flow path, 15...Valve seat, I6...
・Large flat nose, 18...Spring, 21...Small inlet, 22...Small valve seat, M...Small flap, δ・
...Spring, 27...Reed switch. Applicant's agent Kiyoshi Inomata 81st

Claims (1)

[Scope of Claims] 1. A hollow casing comprising an inlet, an outlet, and a flow path that communicates the inlet and the outlet and has a valve seat formed in the middle; A large flat groove that is swingably installed vertically so as to contact and close the valve seat;
a spring that urges the large flat groove toward the valve seat; provided to penetrate the large flat A, and a small valve seat is formed at the end of the casing facing the outlet; a small inlet; a small flat i'e vertically installed on the side of the large flat facing the outlet of the casing so as to be able to swing so as to abut and close the small valve seat of the small inlet; a small spring that urges the small flat groove toward the small valve seat; a detection switch that is arranged close to the small flat groove and detects the swinging movement of the small flat A;
) to flow switch. 2. Flow switch according to claim 1, characterized in that the small flat groove is vertically installed below the large flat R.