JP2018187218A - Water flow detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water flow detector capable of minimizing a gap between a protrusion of a valve body and a valve seat, and at the same time suppressing the interference between the components.SOLUTION: The water flow detector comprises: a main body which includes an inflow port for fluid, an outflow port for the fluid, and a flow channel connecting the inflow port and the outflow port, and is mounted to a pipe of fire-extinguishing equipment; a valve body rotatably mounted to the main body to block the flow channel; and a switch outputting a signal in response to rotation of the valve body. The valve body can swing along a direction toward a rotational shaft of the valve body when the flow channel is blocked.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flowing water detection device attached to a pipe of a fire extinguishing facility.

  The flowing water detection device includes a main body having a flow path, a valve body that is rotatably attached to the main body and closes the flow path, and a switch that detects rotation of the valve body and outputs a signal. doing. In such a flowing water detection device, the valve body is usually placed on a valve seat fitted in the flow path, and the flow path is closed. When the pressure on the secondary side decreases as the sprinkler head opens, the valve body rotates and water flows from the primary side to the secondary side.

  Such a valve body is attached to the main body by inserting a shaft through a shaft hole formed in the valve body and the main body. At this time, in order for the switch to properly detect the rotation of the valve body, the shaft is inserted through the shaft hole without any gap (for example, Patent Document 1).

JP-A-7-265454

  By the way, for example, in a large-sized flowing water detection device, in order to effectively detect the rotation of the valve body, it is preferable to make the gap between the protruding portion of the valve body and the valve seat as small as possible. On the other hand, it is necessary to suppress interference between these components.

  Then, an object of this invention is to provide the flowing water detection apparatus which can suppress the interference between components, making the clearance gap between the protrusion part of a valve body and a valve seat as small as possible.

  In order to solve the above-described problem, the present invention is a flowing water detection device attached to a pipe of a fire extinguishing equipment, and includes a fluid inlet, a fluid outlet, and a flow path connecting the inlet and the outlet. A valve body that is rotatably attached to the main body and that closes the flow path, and a switch that outputs a signal in response to the rotation of the valve body. Provided is a flowing water detection device characterized by being capable of swinging along a direction toward a rotation axis of the valve body in a state where a path is closed.

  In the flowing water detection device of the present invention having the above-described configuration, the valve body has an arm that extends toward the rotating shaft and has the rotating shaft attached to a tip, and the main body includes the rotating shaft. It is preferable to have a hole that is inserted through a shaft and formed with a gap that allows the valve body to swing between the rotating shaft.

  Further, in the flowing water detection device of the present invention having the above-described configuration, the valve body has a tapered protrusion that protrudes toward the inlet in the closed state of the flow path, and the protrusion is It is preferable to have a rounded curved surface on the outer surface of the tip portion.

  Further, in the flowing water detection device of the present invention having the above-described configuration, the main body has a ring-shaped valve seat for mounting the valve body, and the valve seat mounts the valve body. It is preferable to have a rounded connection surface between the surface and the inner peripheral surface.

  ADVANTAGE OF THE INVENTION According to this invention, the flowing water detection apparatus which can suppress the interference between components can be provided, making the clearance gap between the protrusion part of a valve body and a valve seat as small as possible.

It is a front view showing roughly flowing water detector 1 concerning the embodiment of the present invention. It is the sectional view on the AA line of the flowing water detection apparatus 1 of FIG. It is a top view of the flowing water detection apparatus 1 of FIG. It is a left view of the flowing water detection apparatus 1 of FIG. FIG. 2 is an exploded cross-sectional view of the flowing water detection device 1 of FIG. 1. It is sectional drawing which shows the state which the valve body 30 rotated in the flowing water detection apparatus 1 of FIG.

  Hereinafter, the flowing water detection apparatus 1 which concerns on typical embodiment of this invention is demonstrated in detail, referring drawings. However, the present invention is not limited to these drawings. Moreover, since the drawings are for conceptual description of the present invention, the dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

  The flowing water detection device 1 is attached to the piping of each facility as a component of a sprinkler facility, a water spray fire extinguishing facility, a foam fire extinguishing facility, and a foam fire extinguishing facility for a specific parking lot. The flowing water detection device 1 detects a flowing water phenomenon associated with the opening of a closed sprinkler head, a closed foam aqueous solution head, a simultaneous open valve or other valves, and issues a signal or an alarm.

  Here, an example in which the present invention is applied to a working valve type water flow detection device will be described. However, the present invention can be applied not only to other types of wet water flow detection devices, but also to dry flow water detection devices and pre-actuated water flow detection devices.

[Structure of running water detector]
The structure of the flowing water detection apparatus 1 according to the present embodiment will be described. As shown in FIGS. 1 and 2, the flowing water detection device 1 includes a main body 10, a valve body 30, and a switch 50.

(Body)
As shown in FIG. 2, the main body 10 has an inlet 11 connected to a pipe on the water pump side (primary side) and an outlet 12 connected to a pipe on the side of a sprinkler head (secondary side) such as a sprinkler head. And a flow path 13 that connects between the inflow port 11 and the outflow port 12. A valve chamber 14 for accommodating the valve body 30 is formed in the flow path 13.

  As shown in FIG. 5, the valve chamber 14 has an opening 15 connected to the inflow port 11. A valve seat 16 is fitted in the opening 15.

  The valve seat 16 is a ring-shaped metal member on which the valve body 30 is placed. The valve seat 16 is made of a metal material such as brass.

  The valve seat 16 has a flat mounting surface (a bowl-shaped portion) 16A (a plane facing the outflow port 12 side) on which the valve body 30 is mounted, an inner surface (cylindrical portion) 16B, and these surfaces 16A and 16B. It has a rounded connection surface (R-shaped portion) 16C that connects the two. The connection surface 16C is provided to prevent a protrusion 36 of the valve body 30 described later from interfering with the valve seat 16 when the valve body 30 rotates.

  A hole 17 for inserting the pin 35 of the valve body 30 is formed in the main body 10. A sufficient gap S is formed between the hole 17 and the pin 35 for the valve body 30 to swing along the direction D (see FIGS. 2 and 3). In the present embodiment, as shown in FIG. 2, the cross section of the pin 35 is substantially circular, whereas the cross section of the hole 17 through which the pin 35 is inserted is, for example, a substantially elliptical shape or a single center circle. Because of the shape, this gap S is secured.

  If this gap S is, for example, 1 mm in total of the gaps on both sides of the pin 35 (the inner diameter of the hole 17 is 12 mm with respect to the diameter of the pin 35 of 11 mm), regardless of the manufacturing variations of the valve seat 16 and the protrusion 36 Interference between these parts can be suppressed.

  A cylindrical collar (not shown) is inserted along the inner surface of the hole 17. Such a color is made of a resin material such as polyacetal (POM). Since such a collar is interposed between the main body 10 (hole 17) and the pin 35, smooth rotation of the valve body 30 is ensured.

  The main body 10 is formed with a through hole 18 for projecting the pin 35 to the outside of the main body 10. As a result, the pin 35 is connected to the drive shaft 53 of the switch 50.

In addition, the main body 10 has an opening 19 for maintenance. This opening 19 is normally closed by a cover 20. The cover 20 is removed at the time of maintenance, and for example, the valve body 30 is inspected or replaced through the opening 19.
The main body 10 also has a drain valve 21 for opening and closing a drain pipe (not shown) connected to the main body 10.

(Valve)
The valve body 30 is a substantially disk-shaped member that is rotatably attached to the valve chamber 14 of the main body 10, and closes the opening 15 formed in the valve chamber 14 as shown in FIGS. 2 and 6. The valve body 30 has a flat surface 31 facing the valve seat 16 in a state where it is placed on the valve seat 16, that is, in a state where the flow path 13 (opening 15) is closed (see FIG. 6).

  The valve body 30 has an arm 32 extending toward the pin 35 (rotating shaft). The arm 32 is a part for connecting the valve body 30 to the main body 10, and has holes 33 and 34 for inserting the pins 35.

  The pin 35 is fixed to the valve body 30 while being inserted into the holes 33 and 34. Here, a screw groove (not shown) is formed on the outer peripheral surface of the tip of the pin 35 on the hole 33 side, and this screw groove is formed on the inner peripheral surface of the hole 33 (not shown). ), The pin 35 is fixed to the valve body 30. Alternatively, the pin 35 may be fixed to the valve body 30 by other fixing means such as a lock bolt.

  As shown in FIG. 3, the other tip of the pin 35 protrudes to the outside through the main body 10 (the valve chamber 14), and is connected to the drive shaft 53 of the switch 50. Therefore, the pin 35 rotates as the valve body 30 rotates. Thereby, the rotation operation of the valve body 30 is transmitted to the switch 50 side.

  As described above, the pin 35 is inserted through the hole 17 of the main body 10. There is a sufficient gap S along the direction D between the outer peripheral surface of the pin 35 and the inner peripheral surface of the hole 17. The clearance S allows the valve body 30 to swing in the direction D when rotating, so that the valve body 30 and the valve seat 16 can rotate smoothly without interfering with each other. Further, even when a projecting portion 36 and a valve seat 16 which will be described later come into contact with each other, the contact state with the valve seat 16 is canceled by the swinging of the valve body 30, and the normal operation can be restored.

  In the present embodiment, the pin (valve shaft) 35 is disposed below the mounting surface 16 </ b> A of the valve seat 16.

  The valve body 30 also has a protruding portion 36 that protrudes toward the inflow port 11 when placed on the valve seat 16. The protrusion 36 is formed of a synthetic resin such as an engineering plastic such as polyacetal (POM), polyetheretherketone (PEEK), or polytetrafluoroethylene (PTFE). Among these, POM is excellent in self-lubricating property and is not easily worn when used in combination with the metal valve seat 16.

  Here, the protruding portion 36 has a substantially cylindrical shape, but its outer diameter is substantially the same as the inner diameter of the valve seat 16 on the valve body 30 side, and is reduced toward the inflow port 11 side to increase the gap G. doing. That is, the protrusion 36 has a tapered shape. The tapered shape of the protruding portion 36 interferes with the valve seat 16 when the protruding portion 36 of the valve body 30 rotates (especially when the flow path 13 is closed), similarly to the connection surface 16c described above. (For example, interference between components due to variations in component dimensions, etc.) is suppressed, and the protrusion 36 and the valve seat 16 are arranged so as to detect the rotation of the valve body 30 effectively. This is to make the gap G between the two as small as possible.

  Furthermore, the protrusion 36 has a rounded curved surface 36A on the outer surface side of the tip portion in order to more reliably suppress interference between the components as described above (see FIG. 6). The curved surface 36A is coupled with the connection surface 16C of the valve seat 16 and the clearance S between the pin 35 and the hole 17 of the main body 10 described above, and interference between components when the valve body 30 is rotated. This prevents the protrusion 36 from being inserted into and removed from the valve seat 16 smoothly. This will be discussed later.

  For example, when the tolerance in the outer diameter (diameter) of the protrusion 36 is 1.5 mm, the curved surface 36A may be formed so that the curvature radius of the curved surface 36A is 5 mm. By manufacturing the projecting portion 36 with such dimensions, it is possible to suppress interference between parts even when there are variations in part dimensions during the manufacturing process.

(switch)
The switch 50 outputs a signal according to the rotation of the valve body 30. As shown in FIGS. 3 and 4, the switch 50 includes a case 51, a limit switch 52, a drive shaft 53, a lever 54, a pressing portion 56, and a terminal 57.

  The case 51 houses various components such as a limit switch 52, a drive shaft 53, a lever 54, a pressing portion 56, a terminal 57, and a changeover switch 58.

  As shown in FIG. 3, the drive shaft 53 protrudes from the side surface of the case 51 on the main body 10 side. The drive shaft 53 is connected to the pin 35 of the valve body 30 and transmits the rotation of the pin 35 to the lever 54.

  The lever 54 is attached to the drive shaft 53 and rotates according to the rotation of the drive shaft 53. The lever 54 is attached to the spring 55 at the lower end, and is biased so as to press the pressing portion 56 at the upper end. The lever 54 is configured to rotate around the drive shaft 53 independently of the drive shaft 53 and release the pressure of the pressing portion 56 in response to a user operation, for example, for inspection work. Also good.

  The limit switch 52 is, for example, a roller / lever type switch, and outputs a signal when a lever having a roller attached to the tip is pressed by the pressing unit 56.

  The pressing portion 56 is urged in the direction in which the limit switch 52 is pressed, and is pushed back by the lever 54 so as to be separated from the limit switch 52. Therefore, when the lever 54 rotates in the direction R away from the pressing portion 56 as the driving shaft 53 rotates (and user operation), the pressing portion 56 presses the limit switch 52.

  The terminal 57 is electrically connected to each of the limit switch 52 and the changeover switch 58 via electric wires. The changeover switch 58 switches between a steady operation state (ie, a state in which the operation of the valve body 30 is monitored) and a state in which the steady operation is canceled for maintenance.

  In such a switch 50, the lever 54 rotates according to the rotation of the valve body 30 and releases the pressing state of the pressing portion 56. As a result, the pressing unit 56 turns the limit switch 52 on (or off), and a detection signal corresponding to the on (or off) is output from the limit switch 52.

[Operation of running water detector]
Operation | movement of the flowing water detection apparatus 1 which has the structure mentioned above is demonstrated.
In the state where the primary side (inlet 11 side) and secondary side (outlet 12 side) of the main body 10 of the flowing water detection device 1 are filled with pressurized water (or pressurized foamed aqueous solution), a closed sprinkler head (closed) When the mold foam aqueous solution head or the simultaneous opening valve or other valves are opened), the valve body 30 is opened due to the pressure drop on the secondary side, and the pressurized water flows out from the primary side to the secondary side.

  At this time, as shown in FIG. 6, interference between the valve body 30 and the valve seat 16 is suppressed by the curved surface 36 </ b> A at the tip of the protruding portion 36 of the valve body 30 and the connection surface 16 </ b> C of the valve seat 16. Further, even when interference occurs between the valve body 30 and the valve seat 16, the interference state is resolved by the valve body 30 swinging in the direction D of FIGS. As a result, a smooth rotation operation (opening operation) of the valve body 30 is ensured.

  Further, when the valve body 30 returns from the open state shown in FIG. 6 to the closed state shown in FIG. 2, or when the valve body 30 is removed for maintenance and then attached again, the valve body 30 is The valve seat 16 is smoothly placed without interfering with the valve seat 16. Even when the valve body 30 interferes with the valve seat 16, the interference state is immediately resolved by the valve body 30 swinging in the direction D of FIGS.

  As mentioned above, although typical embodiment of this invention was described, this invention is not limited to these, A various design change is possible and they are also contained in this invention.

1 ... Running water detection device,
10 ... body,
11 ... Inlet,
12 ... Outlet,
13 ... flow path,
16 ... valve seat,
17 ... hole,
30 ... Valve,
32 ... arm,
35 ... pin,
50 ... switch,
S: A gap.

Claims (4)

A main body having a fluid inflow port, a fluid outflow port, and a flow path connecting the inflow port and the outflow port.
A valve body rotatably attached to the main body and closing the flow path;
A switch that outputs a signal according to the rotation of the valve body,
The valve body is swingable along a direction toward the rotation axis of the valve body in a state where the flow path is closed;
Flowing water detection device characterized by. The valve body has an arm that extends toward the rotating shaft and has the rotating shaft attached to a tip.
The main body has a hole formed with a gap formed between the rotating shaft and allowing the valve body to swing between the rotating shaft;
The flowing water detection device according to claim 1. The valve body has a tapered protrusion that protrudes toward the inflow port in the closed state of the flow path,
The protrusion has a rounded curved surface on the outer surface of the tip;
The flowing water detection device according to claim 1, wherein: The main body has a ring-shaped valve seat for placing the valve body,
The valve seat has a rounded connection surface between the mounting surface and the inner peripheral surface of the valve body,
The flowing water detection device according to claim 3.