JPS6252278A - Poppet valve type check valve - Google Patents

Abstract

PURPOSE:To accurately detect a flow rate by providing a detecting switch to detect the up and down motion of a poppet valve and a detecting switch to detect the oscillatory motion of a small flapper arranged on the poppet valve. CONSTITUTION:When a small water flow rate is flowing in a water supplying system, a small flapper 27 is pressed to oscillate to the amount of angle corresponding to the flow rate. The oscillatory motion of the small flapper 27 opens a reed switch 35 through a magnet 33. The flow rate can be detected by the function of the reed switch 35. When the amount of supplied water increases, a poppet valve 19 also rises according to the flow rate. The rising motion of the poppet valve 19 opens a reed switch 39 through a magnet 37 to detect the flow rate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a mushroom valve-type check valve, and more particularly, to a compound mushroom-type check valve that is equipped with a flow switch for detecting the flow of fluid.

[Problems with technical foresight of invention etc.]

Check valves are used in water supply systems that supply water sent out from water pumps to predetermined locations to prevent the pump from reversing when the pump stops, such as during a power outage. Water hammer may occur in the water supply system depending on the nature of the water. Therefore, in order to prevent this water hammer, a check valve that performs a quick closing operation using a spring or the like, such as a mushroom valve type check valve, is used. In addition, in a normal water supply system, a flow switch is used to detect the flow in the water supply pipe and accurately control the amount of water fed.

However, such check valves and flow switches have conventionally been installed separately in the water supply pipe, which has resulted in a narrow piping space and increased costs.

(Object of the invention) The present invention has been made in consideration of the above points,
It is an object of the present invention to provide a mushroom valve type check valve having a flow switch function that detects the flow in a water supply pipe and controls the amount of water sent.

[Summary of the invention]

The present invention provides a hollow casing having a fluid inlet, an outlet, and a flow path that communicates the inlet and the outlet and has a valve seat formed in the middle, and a hollow casing that has the valve seat in the casing. a mushroom valve disposed to be movable up and down in the fluid flow direction so as to make a contact amount +); a spring that presses the mushroom valve toward the valve seat; and a spring provided through the mushroom valve. a small port of the mushroom valve facing the outlet of the casing; a small flapper swingably disposed to open and close the small bow 1; and the small flapper connected to the small port; J: A small spring installed, a detection switch that is close to the mushroom valve and detects the vertical movement of the mushroom valve, and a detection switch that is close to the small flapper and detects the swinging movement of the small flapper. a detection switch;
It is a mushroom valve type check valve.

According to the present invention, a small flow rate is reliably detected by the oscillating movement of the small flapper, and a large flow rate is reliably detected by the vertical movement of the mushroom valve.
A control signal for the water supply system can be obtained, and when the pump is stopped, the mushroom valve and the small flapper rapidly close the inflow 1], preventing backflow in the pipeline and effectively preventing water hammer. Further, since the check valve and the flow switch do not have to be provided separately, the piping space will not become narrow.

[Embodiments of the invention]

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

The figure is a sectional view showing an embodiment of the mushroom valve type check valve according to the present invention.

In the figure, reference numeral 11 denotes a hollow casing having a fluid inlet 13 and an outlet 15 at both ends, and a flow path 14 is formed in the hollow casing 11 to communicate the inlet 13 and the outlet 15. has been done. A valve seat 1 is formed in the flow passage 14 so as to protrude from the inner wall of the casing 11.
7 is provided, and a mushroom valve 19 is arranged so as to come into contact with this valve seat 17. The mushroom valve 19 has a size that allows it to come in close contact with the valve seat 17 and completely shut off the flow path 14. The upper part 19a of the mushroom valve 19 has a substantially hollow cylindrical shape, and is inserted into the protector 23, which also has a substantially hollow cylindrical shape, so as to be slidable in the vertical direction. The protector 23 has a rib 24 formed by protruding a part of the inner wall surface of the casing 11.
It is held fixed by. Three to four ribs 24 are provided so that fluid can pass between them.

A spring 21 is provided in a space formed inside the upper part 19a of the mushroom valve and the protector 23, and this spring 21 acts to press the mushroom valve 19 against the valve seat 17.

The mushroom valve 19 has a small port 25 with a small diameter.
It is installed through the. Further, a small valve seat 26 is formed at the end of the small port 25 on the outflow port 15 side. A small flapper 27 that closes the small port 25 in close contact with the small valve seat 26 is swingably disposed on the outlet 15 side of the mushroom valve 19. The end of the small flapper 27 is rotatably inserted into and held by a swing pin 29 fixed to the outlet 15 side of the mushroom valve 19 .
It is pressed toward the small valve seat 26 by a small spring 31 wound around the small valve seat 26. A magnet 33 is attached to the end of the small flapper 27, and a detection switch, such as a reed switch 35, which is activated by the swinging motion of the magnet 33, is fixed to the casing 11 in the vicinity of the magnet 33. Moreover, a magnet 3 is attached to the end of the mushroom valve 19 on the opposite side to the side where the small balls 1 to 25 are bored.
A detection switch, for example a reed switch 39, which is activated by the vertical movement of the magnet 37, is fixed to the casing 11 in the vicinity of the magnet 37. Note that the reed switch 39 can be adjusted and moved in the vertical direction.

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

First, when a small flow rate flows in the water supply system, water is forced into the inlet 13 by the water supply pump, and when it enters the casing 11, the energy of the water pushes the small flapper 27, which swings by an angle corresponding to the flow rate. do. This small flapper 2
The swinging motion of 7 causes the reed switch 35 to be opened by the magnets 1-33. If the angle of the small flapper 27 and its flow rate when the reed switch 35 is opened are determined in advance, the operation of the reed switch 35 detects that water is being fed to the water supply system and its flow rate. In this case, since the mushroom valve is closed, the flow area becomes very small, and small flow rates can be detected accurately. When the amount of water supplied increases further, the mushroom valve 19 also moves upward in accordance with the flow rate. This upward motion of the mushroom valve 19 causes the reed switch 39 to be opened by the magnet 1 37. If the flow rate of the mushroom valve's upper arm changes when the reed switch 39 is opened, the flow rate can be detected in advance. Also, the three reed switches (I'-7, Tiff) can be changed, so
The flow rate for opening the reed switch 39 can be arbitrarily determined.

From the above, when the demand for water is small and the flow rate is below a predetermined small flow rate, the swinging angle of the small wrapper 27 becomes small, the reed switch 35 closes, and the operation of the pump is stopped or other pumps are can be done without reducing the number of vehicles in operation. Next, when the demand for water increases and the small flapper 27 swings to open the reed switch 35, the number of pumps in operation can be increased or the operating status of the pumps can be changed. Furthermore, the demand for water increases, and mushroom valve 19
When the upward movement of the pump starts and the flow reaches a predetermined high flow rate, the three reed switches are opened, so in this case, the number of pumps in operation can be further increased. In this way, it is possible to accurately detect a predetermined small flow rate and a predetermined large flow rate and control the number of pumps in operation, thereby improving the durability of the pump and reducing running costs.

Next, when the pump stops due to a power outage, mushroom valve 1
9 and the small flapper 27 following the spring 2
1 and the small spring 31 perform a rapid closing operation, completely cutting off the flow passage 14 before backflow occurs in the pipe line. This rapid closing action effectively prevents water hammer. At this time, small flapper 2
7 in the closing direction, the reed switch 35 is operated to close, a pump stop signal is generated, and the pump brake is actuated to prevent the pump from reversing.

In addition, in this embodiment, the detection switch is attached to a magnet.
Although we have shown an example configured with a reed switch that operates in response to the movement of ~, this is not limited to this example. good.

Also, for both small flow i% and large flow, the detected flow rate is determined by the size of the inlet, the strength of the spring, the weight of the mushroom valve or small flapper, the position of the reed switch, etc.
These can be freely adjusted as desired.

In order to detect the vertical movement of the mushroom valve and the swinging movement of the small flapper, we have shown an example in which one reed switch is provided, but the invention is not limited to this. good.

By providing a plurality of reed switches, a plurality of predetermined flow rates can be detected for both large and small flow rates, and the number of operating pumps can be controlled more effectively.

〔Effect of the invention〕

As described above, according to the present invention, a predetermined small flow rate in the water supply system can be accurately and easily detected by the swinging motion of the small flapper. Further, by moving the mushroom valve up and down, it is possible to accurately and easily detect a predetermined large flow rate in the water supply system.

This makes it possible to efficiently control the number of water supply pumps in operation. Furthermore, when the pump is stopped, the inlet is rapidly closed, preventing backflow in the water supply pipe, and effectively preventing water hammer. In addition, since the function of a flow switch check valve can be performed by one device, there is no need to separately and independently arrange the device as in the past. Therefore, the piping space does not become narrow, and the cost of the piping system can be reduced. Furthermore, since the number of members in the pipe is reduced, pressure loss can be reduced.

[Brief explanation of drawings]

The figure is a cross-sectional view showing an embodiment of the mushroom valve type check valve according to the present invention. 11...Casing, 13...Inlet, 14...
Flow path, 15... Outlet, 17... Valve seat, 19...
・Mushroom valve, 21... Spring, 23... Protector, 24... Rib, 25... Small port, 27... Small flapper, 31... Small spring, 33... Magnet, 35...Reed switch, 37...Magnetic h, 39...Reed switch.

Claims (1)

[Claims] 1. A hollow casing having a fluid inlet, an outlet, and a flow path that communicates the inlet and outlet and has a valve seat formed in the middle; a mushroom valve arranged to be movable up and down in the fluid flow direction so as to abut and close the valve seat; a spring that presses the mushroom valve toward the valve seat; a spring provided through the mushroom valve; a small port; a small flapper swingably disposed on the side of the mushroom valve facing the outlet of the casing to open and close the small port; pressing the small flapper toward the small port; a detection switch that is close to the mushroom valve and detects the vertical movement of the mushroom valve; and a detection switch that is close to the small flapper that detects the swinging movement of the small flap. Check valve. 2. The mushroom valve type check valve according to claim 1, wherein the detection switch is a reed switch operated by the movement of a magnet. 3. The mushroom valve type check valve according to claim 1, wherein the small spring is wound around the swing pin of the small flapper.