JPH0450532Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a fire hydrant water discharge test device.

(Prior Art) A fire hydrant is meaningless unless it operates reliably in the event of an emergency, so it is necessary to regularly perform water discharge tests to check whether it has the prescribed water discharge capacity.

Therefore, while water is being discharged from the nozzle, the detection end of the Pitot tube pressure detection means is positioned in the water flow at the tip of the nozzle, and the amount of water discharged is detected from the velocity head. One person held the handle of the pressure detection means, positioned the detection end of the lever at a predetermined position in the water stream, and read the pressure. However, there were problems in that it required two workers and it was difficult to accurately detect the amount of water being sprayed. That is, in order to accurately detect the amount of water discharged, it is necessary to position the detection end of the pressure gauge on the center line of the nozzle diameter (inner diameter) and at a distance of one half of the diameter from the nozzle tip. It is practically impossible to hold the handle part of the machine by hand and position it accurately in the above position. Another problem was that the water pressure was dangerous for unskilled people.

Therefore, as shown in FIG.
It has been proposed that a mounting jig 34 for fixing and supporting the nozzle 3 in a position-adjustable manner is attached to the tip of the nozzle 30. This mounting jig 34 is attached to the nozzle 3
A mounting member 3 that is fitted onto the outer periphery of the base of the nozzle tip 32 screwed onto the pipe fitting 31 of No. 0 and fixed with a screw.
5, and a plurality of adjusting members 36 and 37 screwed to adjust the angle and position.

(Problem to be solved by the invention) When the mounting jig 34 is used, the mounting member 35 is fixed to the base of the nozzle tip 32, and the adjustment member 3
If the pressure detection means 33 is positioned by adjusting the position of the nozzle 30 and fixed with screws, pressure can be detected accurately and safely by simply holding the nozzle 30 and spraying water.
The mounting member 35 is fixed with screws, and the plurality of adjustment members 36
The installation work is complicated, such as adjusting the position and fixing the pressure detecting means, and depending on the fixed state, there is a risk that the detection end of the pressure detection means may move due to water pressure.

In view of the above conventional problems, the present invention aims to provide a water discharge test device that can accurately and safely detect the amount of water discharged and is easy to install.

(Means for Solving the Problems) In order to achieve the above object, the present invention integrates a support portion for supporting a pitot tube type pressure detection means on the outer periphery of the tip of a nozzle tip that can be screwed onto the tip of a pipe. A support hole is formed in this support part in a protruding manner parallel to the axis of the nozzle tip part, and a positioning part is formed in the end surface of the support part on the tip side of the nozzle tip part.

(Function) Since the present invention has the above-mentioned configuration, the installation is completed by simply removing the nozzle tip from the pipe pipe and screwing the nozzle chip portion to which the Pitot tube type pressure detection means is attached to the tip of the pipe pipe. A water discharge test can be performed easily and safely. In addition, a support hole parallel to the axis of the nozzle tip is formed in the support part, and a positioning part is formed on the end face on the tip side of the nozzle tip, so that the detection end of the pressure detection means can be positioned on the axis of the nozzle tip. In addition, it can be accurately positioned at a predetermined distance from the tip, and there is no fear that the detection end will move due to water pressure, making it possible to accurately detect pressure.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

First, the overall structure of a fire hydrant will be explained with reference to FIG. 2. Reference numeral 1 denotes a storage box, and one or more water discharge valves 2 and 3 are disposed on one side of the storage box. 2 is a small diameter water discharge valve for initial fire extinguishing that can be used even by amateurs, 3 is a large diameter water discharge valve,
It is provided so that firefighters can connect a hose to it and extinguish the fire. A base end 4b of a hose 4 is connected to the water discharge valve 2. The hose 4 is stored in a state in which it is folded up and down in a meandering manner so as to ensure a predetermined length and can be pulled out smoothly, and each folded portion at the top is supported by a hose rack 5. A nozzle 6 is connected to the tip member 4a of the hose 4. The nozzle 6 is composed of a pipe 7 that rectifies the water flow flowing through the hose 4 and a nozzle tip 8 screwed onto the tip of the pipe 7.

Next, a water discharge test device 10 installed in place of the nozzle tip 8 will be explained with reference to FIG.

Reference numeral 11 denotes a nozzle tip portion corresponding to the nozzle tip 8, and its inner surface is formed to have the same shape as the nozzle tip 8. A female thread 14 is formed on the inner periphery of the proximal end 11a of the nozzle tip portion 11, and is threaded into the male thread 13 of the tip cap 12 of the tube sleeve 7, and a seal attached to the tip cap 12 is formed on the end surface 11b. The material 15 is in pressure contact. A support portion 16 for supporting the pressure detection means 20 is formed protruding from the outer periphery of the tip of the nozzle tip portion 11 . A support hole 17 parallel to the axis O of the nozzle tip portion 10 is formed in the boss portion 16a at the tip of the support portion 16, and the end surface of the boss portion 16a on the tip side of the nozzle tip portion 11 serves as a positioning end surface 18. Furthermore, a detent groove 19 is formed in the diametrical direction.

The pressure detection means 20 is of a pitot tube type, and its pitot tube main body 21 is formed in a substantially L-shape, and has a bent portion 21a projecting laterally at one end, the tip of which is a detection end 21b. It's summery. or,
From the other end of the pitot tube main body 21, the bent portion 2
A mounting shaft 22 extends in the same direction as 1a.
This mounting shaft 22 is formed with a support shaft portion 22b that fits into the support hole 17 via a step surface 22a, a fixing screw portion 22c is formed at the tip end, and further adjacent to the step surface 22a, An engagement pin 23 that engages with the anti-rotation groove 19 is driven in. Then, the step surface 22a comes into contact with the positioning end surface 18 of the support portion 16, and the engagement pin 23
9 until the support shaft portion 22b is engaged with the support hole 1.
The pitot tube main body 21 is attached to the support part 16 by fitting into the fixing screw part 22c and tightening the cap nut 24 by screwing the cap nut 24 into the fixing screw part 22c.
At the axial center position of the L-shaped pitot tube body 21, there is an L.
A pressure introduction passage 25 is bored in the shape of a letter and communicates with a gauge 26 attached to the other end of the pitot tube body 21.

Furthermore, when the pitot tube main body 21 is attached to the support part 16 as described above, the pressure introduction passage 25a in the bent part 21a is located on the same axis as the axis O of the nozzle tip part 11, and The distance between the detection end 21b of the tip and the tip of the nozzle tip 11 is D/2, where D is the aperture of the tip of the nozzle tip 11.

In the above configuration, in order to assemble the water discharge test device 10, it is sufficient to attach the pitot tube body 21 of the pressure detection means 20 to the support portion 16 of the nozzle tip portion 11 as described above, and to attach the gauge 26 to this pitot tube body 21. .

When performing a water spray test on a fire hydrant, take out the nozzle 6 shown in Figure 2 and insert its nozzle tip 8.
is removed from the pipe 7, and the water discharge test device 10 assembled as described above is attached. After that, when the water discharge valve 2 is fully opened and water is discharged, the dynamic pressure (total pressure) of the water flow flowing out from the tip of the nozzle tip portion 11 is introduced from the detection end 21b to the gauge 26 via the pressure introduction passage 25, and from the detected pressure. The amount of water discharged can be detected.

In the above embodiment, the positioning end surface 18 is formed on the support portion 16 and the stepped surface 22a of the mounting shaft 22 is brought into contact with the positioning end surface 18 for positioning.
The positioning may be performed by engagement of the rotation stopper groove 19 with the rotation stopper groove 19.

(Effects of the invention) According to the fire hydrant water test device of the present invention, as described above, all you need to do is remove the nozzle tip from the pipe and screw the nozzle tip with the pitot tube type pressure detection means attached to the tip of the pipe. Since the installation is completed, the work is easy and water discharge tests can be performed safely. In addition, a support hole parallel to the axis of the nozzle tip is formed in the support part, and a positioning part is provided on the end face of the support part on the tip side of the nozzle chip, so that the detection end of the pressure detection means can be accurately positioned on the axis of the nozzle tip. In addition to being able to be positioned accurately at a predetermined distance from the tip of the nozzle tip, there is no risk of the detection end moving due to water pressure, and accurate pressure detection is possible. It has a great effect.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a partially sectional front view of a water discharge test device, FIG. 2 is an overall front view of a fire hydrant, and FIG. 3 is a perspective view of a conventional example. DESCRIPTION OF SYMBOLS 10... Water discharge test device, 11... Nozzle tip part, 16... Support part, 17... Support hole, 18...
Positioning end face, 20... Pressure detection means, 21...
Pitot tube body, 21b...detection end.

Claims (1)

[Scope of utility model registration request] A support part for supporting a pitot tube type pressure detection means is integrally formed on the outer periphery of the tip of the nozzle tip that can be screwed onto the tip of the tube, and a support hole parallel to the axis of the nozzle tip is formed in this support part. What is claimed is: 1. A water discharge test device for a fire hydrant, characterized in that a positioning portion is formed on the end face of the support portion on the tip side of the nozzle tip portion.