JP6924988B2 - Water flow detector - Google Patents

Description

The present invention relates to a water flow detection device attached to a pipe of fire extinguishing equipment.

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

In such a water flow detection device, in order to detect the rotation of the valve body, the valve shaft fixed to the valve body protrudes to the outside of the main body, and a lever is attached to the protruding tip portion. Then, the detection signal is output when the lever is separated from the limit switch by the rotation of the valve body (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 7-265454

In the water flow detection device of Patent Document 1, the valve body, the valve shaft, and the lever are fixed, and the positional relationship between these parts is strictly defined. Therefore, it takes time and effort to install the valve body, including the alignment between the parts.

Therefore, an object of the present invention is to provide a water flow detection device capable of easily performing the valve body mounting work.

In order to solve the above-mentioned problems, the present invention is attached to a pipe of a fire extinguishing system, has a main body having a fluid flow path, and is rotatably attached to the main body via a rotation shaft to block the flow path. The valve body includes a valve body and a switch that outputs a signal in response to the rotation of the valve body, and the main body detachably closes an opening facing the tip of the rotation shaft and the opening. Further including a shaft retainer, at least one of the tip portion of the rotating shaft and the tip portion of the shaft retainer on the rotating shaft side bulges to the other side. Provide a detection device.

Further, the present invention includes a main body attached to a pipe of a fire extinguishing system and having a fluid flow path, a valve body rotatably attached to the main body via a rotation shaft, and a valve body that closes the flow path. A switch that outputs a signal in response to rotation of the valve body is provided, and the main body further includes an opening facing the tip of the rotation shaft and a shaft retainer that detachably closes the opening. Provided is a water flow detection device characterized in that the tip end portion of the rotating shaft is in point contact with the shaft retainer in a state of being in contact with the shaft retainer.

In the water flow detection device of the present invention having the above configuration, it is preferable that the rotating shaft is screwed to the valve body and the shaft retainer is screwed to the opening.

According to the present invention, it is possible to provide a water flow detection device capable of easily performing a valve body replacement work.

It is a front view which shows the flow water detection apparatus 1 which concerns on the typical embodiment of this invention. It is a top view of the water flow detection device 1 of FIG. It is a left side view of the water flow detection device 1 of FIG. FIG. 5 is a cross-sectional view taken along the line AA of the water flow detection device 1 of FIG. It is an enlarged view of the area S of FIG.

Hereinafter, the water flow detection device 1 according to a typical embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings. In addition, since the drawings are for conceptually explaining the present invention, the dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

The flow water detection device 1 is attached to the piping of each facility as a component of a sprinkler system, a water spray fire extinguishing system, a foam fire extinguishing system, and a foam fire extinguishing system for a specific parking lot. The water flow detection device 1 detects a water flow phenomenon associated with the opening of a closed sprinkler head, a closed foam aqueous solution head, a simultaneous release 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 is applicable not only to other types of wet water flow detection devices, but also to dry water flow detection devices and pre-actuated water flow detection devices.

[Structure of water flow detection device]
The structure of the water flow detection device 1 according to the present embodiment will be described. As shown in FIGS. 1 and 4, the water flow detection device 1 has a main body 10, a valve body 30, and a switch 50. Hereinafter, these components will be described in order.

(Main body)
As shown in FIG. 4, the main body 10 has an inflow port 11 connected to a pipe on the water supply pump side (primary side) and an outlet 12 connected to a pipe on the watering device side (secondary side) such as a sprinkler head. And a flow path 13 connecting 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.

The valve chamber 14 has a valve seat 16 fitted in an opening connected to the inflow port 11. The valve seat 16 is a substantially ring-shaped member on which the valve body 30 is placed, and is made of a metal material such as brass.

As shown in FIG. 2, the main body 10 is formed with a hole 17 for inserting a pin (rotating shaft) 35 of the valve body 30. A sufficient gap is formed between the hole 17 and the pin 35 for the valve body 30 to swing along the extending direction of the arm 32 (see FIGS. 2 and 4). In the present embodiment, as shown in FIG. 4, the cross section of the pin 35 is substantially circular, whereas the cross section of the hole 17 is, for example, a substantially elliptical shape or a single core circular shape. Is secured. The gap allows the valve body 30 to swing along the extending direction of the arm 32. As a result, even if the protruding portion 36 of the valve body 30 is designed to narrow the gap between the valve body 30 and the valve seat 16 for effective detection of the rotation of the valve body 30, the valve body 30 rotates smoothly. Is possible.

The main body 10 is also 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.

Further, as shown in FIG. 2, an opening 22 is formed in the main body 10, and the opening 22 is closed by a shaft retainer 23. Specifically, as shown in FIG. 5, the opening 22 is provided so as to face the tip (head) 35A of the pin 35, and functions as a female screw by having a screw groove on the inner peripheral surface.

The shaft retainer 23 has a screw groove 23B on the outer peripheral surface facing the opening 22 and functions as a male screw. Therefore, the shaft retainer 23 is fixed to the main body 10 by engaging the opening 22 with the shaft retainer 23.

The tip 23A of the shaft retainer 23 faces the tip 35A of the pin 35. These tip portions 23A and 35A are usually separated from each other. However, if the fastening between the pin 35 and the valve body 30 is loosened, the pin 35 may move to the shaft retainer 23 side, and the tip portions 23A and 35A may come into contact with each other. At this time, the tip portions 23A and 35A are designed to make point contact, as will be described in detail later.

Here, the point contact means that the contact area between the tip portion 35A of the pin 35 and the tip portion 23A of the shaft retainer 23 is sufficiently small to prevent the pin 35 and the shaft retainer 23 from rotating together. It shall point. By contacting with such a small area, it is possible to prevent the pin 35 and the shaft retainer 23 from rotating together with the rotation of the valve body 30.

As an example of the design that enables the point contact described above, as shown in FIG. 5, the tip portion 23A of the shaft retainer 23 is substantially flat, and the tip portion 35A of the pin 35 is configured to have a substantially curved surface shape, for example. It bulges toward the shaft retainer 23 side. On the contrary, the tip portion 23A of the shaft retainer 23 may be formed in a substantially curved surface shape and bulge toward the pin 35, and the tip portion 35A of the pin 35 may be substantially flat. Alternatively, both the tip portions 23A and 35A may be formed in a substantially curved surface shape, for example, and may bulge toward the mating side. Furthermore, at least one of the tips 23A and 35A may be sharp.

Returning to the description of the main body 10, the main body 10 has an opening 19 for maintenance as shown in FIG. The opening 19 is usually closed by a cover 20. At the time of maintenance, the cover 20 is removed, and the valve body 30, for example, 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, as shown in FIG.

(Valve body)
The valve body 30 is a substantially disk-shaped member that is rotatably attached to the valve chamber 14 of the main body 10. As shown in FIG. 4, the valve body 30 is placed on the valve seat 16 to block the flow path 13.

As shown in FIGS. 2 and 4, the valve body 30 has an arm 32 extending toward the pin 35 (rotating shaft). The arm 32 has holes 33 and 34 for inserting the pin 35. The valve body 30 is connected to the main body 10 by inserting the pin 35 into the holes 33 and 34 of the arm 32 and the holes 17 of the main body 30.

The main body 10, the valve body 30, and the pin 35 have a so-called hinge-like structure, the main body 10 corresponds to the wings of three main tubes, the valve body 30 corresponds to the wings of two main tubes, and the pin 35 corresponds to the wings of two main tubes. It corresponds to a core rod that connects these.

The pin 35 is fixed to the valve body 30 in a state of being inserted into the holes 33 and 34. Here, as shown in FIG. 5, a screw groove 35C is formed on the outer peripheral surface near the tip (head) 35A of the pin 35, and the screw groove 35C is a hole 33 having a screw groove on the inner peripheral surface. By engaging with, 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 described above, the tip portion 35A of the pin 35 is designed to have a substantially curved surface shape so as to make point contact with the tip portion 23A of the shaft retainer 23. Further, the tip portion 35A of the pin 35 may be formed with a groove or a hole (not shown) for screwing the pin 35 into the valve body 30 with a tool such as a screwdriver, a wrench, or a spanner. When fixing such a type of pin 35 to the valve body 30, the user inserts a tool through the opening 22 of the main body 10 with the pin 35 inserted into the valve body 30 and the main body 10, and inserts the tip 35A of the pin 35. It can be screwed into the valve body 30 with a tool.

As shown in FIG. 2, the other tip portion 35B of the pin 35 penetrates the main body 10 (valve chamber 14) and projects outward, and is connected to the drive shaft 53 of the switch 50. Therefore, the drive shaft 53 rotates with the rotation of the valve body 30. As a result, the rotational operation of the valve body 30 is transmitted to the switch 50 side.

As shown in FIG. 4, the valve body 30 also has a tapered protruding portion 36 that protrudes toward the inflow port 11 when mounted on the valve seat 16. The protrusion 36 is made of a resin such as polyacetal (POM). POM has excellent self-lubricating properties and is less likely to wear when used in combination with a metal valve seat 16.

(switch)
The switch 50 outputs a signal according to the rotation of the valve body 30. As shown in FIGS. 2 and 3, such a 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 parts 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. 2, the drive shaft 53 projects from the side wall of the case 51 on the main body 10 side. As described above, 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 in the direction R of FIG. 3 in accordance with the rotation of the drive shaft 53. The lever 54 is attached to the spring 55 at the lower end and is urged 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 to release the pressing of the pressing portion 56 in response to a user operation, for example, for inspection work. May be 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 thereof is pressed by the pressing portion 56.

The pressing portion 56 is urged in the direction of pressing the limit switch 52, while being 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 away from the pressing portion 56 with the rotation (and user operation) of the drive shaft 53, 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 an electric wire. The changeover switch 58 switches between a state of steady operation (that is, a state of monitoring the operation of the valve body 30) and a state of canceling steady operation for maintenance.

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

[Operation of water flow detection device]
The operation of the water flow detection device 1 having the above-mentioned structure will be described.
A closed sprinkler head (closed) in a state where the primary side (inflow port 11 side) and the secondary side (outlet 12 side) of the main body 10 of the flow water detection device 1 are filled with pressurized water (or pressurized foam aqueous solution). When the foam aqueous solution head or the simultaneous release valve or other valve is opened), the valve body 30 opens 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, the pin 35 rotates with the rotation of the valve body 30. In this embodiment, the pin 35 is screwed to the valve body 30 as described above. Therefore, for example, the screw may loosen due to repeated opening and closing operations of the valve body 30, and the pin 35 may come into contact with the shaft retainer 23 (see FIG. 5). In this case, the tip 35A of the pin 35 and the tip 23A of the shaft retainer 23 are in point contact, or the contact area between the two is small, so that the pin 35 and the shaft retainer 23 are suppressed from rotating together. .. Therefore, it is possible to prevent loosening of the shaft retainer 23 and water leakage associated therewith.

The replacement of the valve body in the water flow detection device 1 is performed as follows, for example.
That is, after draining the water, the user loosens the shaft retainer 23 with a spanner and removes the shaft retainer 23 from the opening 22 of the main body 10. Next, the driver is inserted into the opening 22 of the main body 10, the pin 35 is loosened, and the pin 35 is taken out from the opening 22. As a result, the valve body 30 can be removed from the main body 10. Then, the cover 20 of the main body 10 is removed, the valve body 30 is taken out from the opening 19, and necessary work such as replacement and inspection of parts is performed.

To attach the valve body 30 to the main body 10, first, the valve body 30 is inserted into the main body 10 through the opening 19 and placed on the valve seat 16. Next, the pin 35 is inserted through the opening 22 of the main body 10 and screwed into the valve body 30. At this time, the tip portion 35B of the pin 35 is engaged with the drive shaft 53. Then, the shaft retainer 23 is screwed into the opening 22 of the main body. Then, the cover 20 is attached to the opening 19.

As described above, in the present embodiment, it is not necessary to strictly align the valve body 30, the pin 35, and the drive shaft 53, and the valve body 30 can be easily mounted on the main body 10.

Although the typical embodiments of the present invention have been described above, the present invention is not limited to these, and various design changes are possible, and these are also included in the present invention.
For example, the means for fixing the shaft retainer 23 to the opening 22 may be other than a screw.

1 ... Flow detection device,
10 ... Main body,
13 ... Flow path,
22 ... Aperture,
23 ... Shaft retainer 30 ... Valve body,
35 ... pin,
50 ... Switch.

Claims (2)

A main body that is attached to the piping of fire extinguishing equipment and has a fluid flow path,
A valve body that is rotatably attached to the main body via a rotation shaft and closes the flow path,
A switch that outputs a signal in response to the rotation of the valve body is provided.
The main body further includes an opening facing the tip of the rotating shaft and a shaft retainer that detachably closes the opening.
The tip of the rotating shaft is in point contact with the shaft retainer in a state of being in contact with the shaft retainer .
The other tip of the rotating shaft is connected to the switch .
A water flow detection device characterized by. The rotating shaft is screwed to the valve body and
The shaft retainer is screwed to the opening.
The water flow detection device according to claim 1.

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