JP2018187221A - Flowing water detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water flow detection device capable of preventing foreign matter in a pipe from adhering to a sealing material for sealing a through hole for projecting a rotation shaft of a valve body to the outside of a main body. SOLUTION: A main body which is attached to a pipe of a fire extinguishing system and has a fluid flow path, a valve body which is rotatably attached to the main body via a rotation shaft and closes the flow path, and the valve body. The main body has a through hole for projecting the rotation shaft to the outside of the main body, and the rotation shaft has the through hole. A sealing material attached to the outer peripheral surface of the rotating shaft facing the above and sealing the through hole, and a sealing material attached to the outer peripheral surface on the flow path side of the sealing material to prevent foreign matter from adhering to the sealing material. A water flow detection device including a first ring member for suppressing. [Selection diagram] Fig. 5

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.

  In this type of flowing water detection device, in order to transmit the rotation of the valve body to the switch, the rotation shaft of the valve body protrudes outside the main body. Further, a packing (seal material) is interposed between the rotation shaft and the through hole of the main body, and the through hole is sealed (for example, Patent Document 1).

JP 2005-114174 A

  In such a flowing water detection device, dust (foreign matter) in the pipe may adhere to the sealing material. In that case, there is a possibility that water leaks from the through hole to the outside of the main body, or that the valve body may be troubled.

  Then, an object of this invention is to provide the flowing water detection apparatus which can prevent the foreign material in piping adhering to the sealing material which seals a through-hole.

  In order to solve the above-described problems, the present invention is attached to a pipe of a fire extinguishing equipment, and has a main body having a fluid flow path, and is rotatably attached to the main body via a rotation shaft, thereby closing the flow path. And a switch that outputs a signal in response to the rotation of the valve body, and the main body has a through-hole for projecting the rotation shaft to the outside of the main body, The rotating shaft is attached to the outer peripheral surface of the rotating shaft facing the through hole, the sealing material for sealing the through hole, and the outer peripheral surface on the flow channel side of the sealing material, And a first ring member that suppresses the adhesion of foreign matter to the sealing material.

  In the flowing water detection device of the present invention having the above-described configuration, the rotating shaft is attached to the outer peripheral surface on the side opposite to the first ring member with respect to the sealing material, and sealing the sealing material It is preferable to further include a second ring member that ensures performance.

  Moreover, in the flowing water detection apparatus of this invention which has the above structures, it is preferable that at least one of the first ring member and the second ring member is made of a hydrophobic resin material.

  Moreover, in the flowing water detection device of the present invention having the above-described configuration, the sealing material, the first ring member, and the second ring member are mounted in a groove provided on the outer peripheral surface. Is preferred.

  ADVANTAGE OF THE INVENTION According to this invention, the flowing water detection apparatus which can prevent the foreign material in piping adhering to the sealing material which seals a through-hole can be provided.

It is a front view which shows the flowing water detection apparatus 1 which concerns on typical embodiment of this invention. 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. It is the sectional view on the AA line of the flowing water detection apparatus 1 of FIG. FIG. 3 is an enlarged view of a region S in FIG. 2.

  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 to 4, the flowing water detection device 1 includes a main body 10, a valve body 30, and a switch 50. Hereinafter, these components will be described in order.

(Body)
As shown in FIG. 4, 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 watering device (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.

  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, for example.

  As shown in FIG. 2, a hole 17 for inserting a pin (rotating shaft) 35 of the valve body 30 is formed in the main body 10.

  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 will be described in detail later, the pin 35 is inserted into the through hole 18, but the pin 35 and the through hole 18 are sealed by an O-ring 41 attached to the pin 35. This prevents water from leaking from the through hole 18 of the main body 10.

  However, the through hole 18 may be provided with a valve shaft retainer 22 that rotatably supports the pin 35 (rotating shaft). In that case, the space between the valve shaft retainer 22 and the pin 35 is sealed by the O-ring 41. In the present embodiment, including such a case, the through hole 18 is sealed by the O-ring 41.

In addition, the main body 10 has an opening 19 for maintenance as shown in FIG. 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 as shown in FIG.

(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. As shown in FIG. 4, the valve body 30 closes the flow path 13 by being placed on the valve seat 16.

  As shown in FIGS. 2 and 4, the valve body 30 has an arm 32 that extends toward the pin 35 (rotating shaft). The arm 32 has holes 33 and 34 through which the pins 35 are inserted. The pin 35 is inserted into the holes 33 and 34 of the arm 32 and the hole 17 of the main body 30, whereby the valve body 30 is connected to the main body 10.

  Here, the pin 35 as the rotation shaft may be a single member or may include a plurality of constituent members. For example, as shown in FIG. 5, the pin 35 may include an operating shaft 35 </ b> A that protrudes from the main body 10 and is inserted into the through hole 18 as another part. In the present embodiment, the term “pin 35” or “rotating shaft” includes such an operating shaft 35A.

  The pin 35 is fixed to the valve body 30 while being inserted into the holes 33 and 34. Here, the pin 35 is fixed to the valve body 30 by the thread groove formed near the head of the pin 35 engaging with the thread groove formed on the inner peripheral surface of the hole 33. 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. 2, the operating shaft 35 </ b> A of the pin 35 penetrates through the main body 10 (the valve chamber 14) and protrudes to the outside, and is connected to the drive shaft 53 of the switch 50. Therefore, the drive shaft 53 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 O-ring 41 is attached to the pin 35, and backup rings 42 and 43 are attached to both sides of the O-ring 41. The O-ring 41 and the backup rings 42 and 43 are fitted in a groove 35 </ b> B formed on the outer peripheral surface of the operating shaft 35 </ b> A of the pin 35 facing the through hole 18 of the main body 10.

  More specifically, the O-ring 41 is an annular sealing material (packing) having a substantially circular cross section. The O-ring 41 is made of, for example, a rubber material, a resin material, or a composite material. The O-ring 41 seals the through-hole 18 by being sandwiched between the pin 35 and the through-hole 18 (valve shaft retainer 22) of the main body 10 and elastically deforming.

  A backup ring 42 is attached to the flow path 13 side of the O-ring 41 (inside the main body 10). The backup ring 42 is an example of a first ring member, and dust (foreign matter) in the flow path 13 adheres to the O-ring 41 to impair the sealing function of the O-ring 41 or smoothly rotate the valve body 30. To prevent or disturb. A general backup ring is mounted on the low pressure side in order to prevent the packing (sealing material) from protruding from the gap between the grooves due to high pressure. In this embodiment, the backup ring 42 is an O-ring. This is used to prevent the entry of dust into 41. The backup ring 42 also serves to suppress the penetration of water in the flow path 13 into the through hole 18.

  The backup ring 42 is preferably formed of a resin material such as a fluororesin and has hydrophobicity. The shape of the backup ring 42 may be any of a spiral spiral, a bias cut having an oblique cut surface in an annular portion, and an annular endless.

  A backup ring 43 is attached to the O ring 41 on the opposite side of the backup ring 42 (outside the main body 10). The backup ring 43 is an example of a second ring member, and prevents the O-ring 41 from biting into the gap between the through hole 18 (valve shaft presser 22) of the main body 10 and the rotation shaft 35 due to water pressure. Ensuring sealing performance. In the present embodiment, the backup ring 43 is also intended to prevent assembly errors in the manufacturing process.

  Like the backup ring 42, the backup ring 43 is preferably made of a resin material and has hydrophobicity. Further, the shape of the backup ring 43 may be any of spiral, bias cut, endless and the like.

  As shown in FIG. 4, the valve body 30 also has a taper-shaped protruding portion 36 that protrudes toward the inlet 11 in a state of being placed on the valve seat 16. The protruding portion 36 is made of a resin such as polyacetal (POM). POM is excellent in self-lubricating property and is not easily worn when used in combination with the 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, 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. 2, the drive shaft 53 protrudes from the side wall 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 in the direction R in FIG. 3 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 away from the pressing portion 56 with the rotation of the drive shaft 53 (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 a state where the primary side (inlet 11 side) and the secondary side (outlet 12 side) of the main body 10 of the flowing water detection device 1 are filled with pressurized water (or a pressurized foam aqueous solution), the valve body 30 The flow path 13 is blocked by being placed on the seat 16. When the closed sprinkler head (which may be a closed foam aqueous solution head or a simultaneous open valve or other valve) is opened, the valve body 30 is separated from the valve seat 16 due to the pressure drop on the secondary side, and the flow path 13 is opened. Flows out from the primary side to the secondary side.

  In any of the above states, the backup ring 42 prevents dust from entering the O-ring 41 from the flow path 13 side. This, combined with the fact that the backup ring 42 has hydrophobicity, improves the effect of suppressing the adhesion of dust to the O-ring 41, and as a result, water leakage from the through hole 18 and the rotation of the valve body 30. Defects are prevented.

  Further, the backup ring 43 prevents the so-called protrusion phenomenon of the O-ring 41 and prevents water leakage from the through hole 18.

  Furthermore, by adopting a sandwich structure of the O-ring 41 by the backup rings 42 and 43, it is possible to suppress an assembly error such as forgetting to attach one or both of the backup rings 42 and 43 in the manufacturing process. Improvement in reliability is expected.

  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,
13 ... flow path,
30 ... Valve,
35 ... pin,
35B ... groove,
41 ... O-ring,
42, 43 ... backup ring 50 ... switch.

Claims (4)

A body that is attached to the piping of the fire extinguishing equipment and has a fluid flow path;
A valve body rotatably attached to the main body via a rotation shaft, and closing the flow path;
A switch that outputs a signal according to the rotation of the valve body,
The main body has a through hole for projecting the rotation shaft to the outside of the main body,
The pivot axis is
A sealing material attached to the outer peripheral surface of the rotating shaft facing the through hole, and sealing the through hole;
A first ring member that is attached to the outer peripheral surface on the flow path side relative to the sealing material, and suppresses the adhesion of foreign matter to the sealing material;
A flowing water detection device comprising: The rotation shaft further includes a second ring member that is attached to the outer peripheral surface opposite to the first ring member with respect to the sealing material, and ensures sealing performance of the sealing material;
The flowing water detection device according to claim 1. At least one of the first ring member and the second ring member is made of a hydrophobic resin material;
The flowing water detection device according to claim 2. The sealing material, the first ring member, and the second ring member are mounted in a groove provided on the outer peripheral surface;
The flowing water detection device according to claim 2 or 3.