JPS644365Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a foaming machine with a damper that can change the foam quality while continuing the foaming operation by changing the foaming conditions by remote control.

Conventionally, disaster prevention equipment has been adopted in which a foamer is installed on top of the oil dike so that the moat around the oil tank can be filled with foam in case of a leak of hazardous materials. Foaming machines are used that can obtain foam with a high expansion ratio in line with the purpose of obtaining foam within a short period of time. Foam with a high expansion ratio quickly suppresses fire intensity, but its ability to completely extinguish a fire is inferior to foam with a low expansion ratio, so it is recommended to switch to foam with a low expansion ratio after several minutes have passed since the start of foam release. It is rare.

However, it is difficult to quickly manually switch a foamer located on an embankment several meters high in a dangerous and toxic environment, so even after the fire has been suppressed, high foaming ratios are unnecessarily released. The current situation had to continue.

The present invention is designed to install one or more nozzles at any position in the air introduction path from behind the nozzle provided in the center of the main body to the air intake port, preferably near the air intake port, so that the foam aqueous solution can be emitted onto the mesh stretched over the foam discharge port. A damper structure consisting of a plate is provided, and the air introduction passage can be opened and closed by driving this plate.More preferably, a through hole occupying a considerable area of the plate is bored in the center of the plate, or a plurality of plates are provided. When the damper is closed, a part of the plate is missing, and an opening consisting of the through hole and/or the missing part is prepared in advance. This invention relates to a foaming machine with a damper that allows the flow of water.

Since the water stream emitted from the nozzle moves the surrounding air to generate an air stream, sufficient space is provided in front and behind the nozzle so as not to obstruct the generation of the air stream. This air flow passes through the mesh together with a relatively small volume of water film, becomes bubbles, and is lost outside the device. Therefore, the air introduction passage should have a sufficiently large opening cross-sectional area behind the nozzle so that air can be easily replenished. It is directly connected to the air intake port with no obstruction to air circulation. Therefore, it is preferable that the foamer body has a cylindrical shape.

In a cylindrical foamer having the same cross-sectional area A from the foam discharge port to the air intake port, the mesh stretched over the foam discharge port is formed in a sawtooth shape to increase the foaming area.
Since a mesh is used in which the area ratio of the openings between the meshes is about 50%, the opening area B that is effective for the passage of airflow is approximately equal to A.

As a result of the inventor's study of many cylindrical foamers, it was found that when the ratio of the cross-sectional area of the air introduction path, that is, A, to the opening area B of the outlet, A/B, is approximately equal to 1, the high When A is narrowed to about 80% in a foamer that can emit foam with a certain foaming ratio, the foaming ratio hardly decreases in many cases, but when the ratio is narrowed to 60% or less, foam particles passing through the mesh of the foam outlet The present invention was achieved by discovering the fact that the bubbles become significantly smaller and emitting foam with a low expansion ratio.

Embodiments of the present invention will be described below based on the drawings.

A plan view of an embodiment of the present invention is shown in FIG. 1, a left side view is shown in FIG. FIG. 4 is a perspective view of the damper structure, FIG. 5 is a perspective view of the damper structure, and FIG. 6 is a perspective view of the damper structure during operation.

In FIG. 1, the square tube-shaped foamer main body has a central part 3 containing a nozzle body 2 equipped with a nozzle 1 shown by dotted lines, a netted part near the foam outlet 4, and an air flow generating part 6. It is constructed by fitting together three parts: a main body tip 7 and a main body rear part 9 opening an air intake port 8, and these are all cylinders with the same vertical cross-sectional area.

A foam aqueous solution is fed under pressure to the nozzle body 2 through a piping 10, and a thin conduit 11 branches off to supply water to a piston 14 mounted on a pedestal 13 via a three-way solenoid valve 12.

Arrow 15 indicates a drainage channel during piston operation, 16 indicates a bearing of the damper shaft, and the section of arrow D←→D forms an air introduction channel.

In FIG. 2, a four-stage serrated net 18 is stretched over the foam outlet 4, and four nozzles 1 are supported and fixed on nozzle supports 19 inside the main body as shown by dotted lines. There is. Below the pedestal 13 of the piston 14, a damper rotation mechanism is housed in the storage box 20, located at the rear of the main body.

Figure 3 shows an insect screen 2 stretched over the air intake port 8.
1 and storage box 20 are partially cut away to show the damper structure before rotation.

The insect screen 21 placed at the air intake port 8 is
It is used to keep the inside of the foamer clean.
Nets with an open area of 80% or more between the meshes are used so as not to impede air circulation.

Three plates 22, 23 and 2 forming the damper
4 has several large through holes 25 formed in the center of each plate surface to form openings, and each of the damper shafts 4 rotates via a damper shaft 26 whose left end is fitted into a bearing 16. The right end of the damper shaft 26 is connected to a rotation mechanism consisting of an intermediate joint 27, an actuating rod 28, and the like.

In FIG. 4, three plates 22, 23 and 24
is shown with the air introduction passage half open, but there are several through holes 25 in the center of each plate.
The gap between the plates is also quite wide, so the amount of air flowing in this state is the same as when the damper is fully open.
In other words, each plate maintains its horizontal direction, and there is no possibility that a biased flow will occur in the latter half of the air introduction path (arrow E←→E) from the damper to the nozzle 1.

If the through holes 25 are not provided in each of the plates 22, 23 and 24, the purpose of blocking part of the air introduction path can be achieved by making it possible to stop the rotation of the damper at a predetermined angle as shown in Fig. 4. However, since the air volume is large, it is often necessary to make the plate and rotating mechanism robust, and to make the rear half E→E of the air introduction path large. Therefore, in this example, an opening is provided in the center of the plate. This structure achieves the purpose of the present application more simply, reliably, and inexpensively.

The total area of each part 18a of the serrated mesh 18 stretched over the foam outlet 4 is the area of the opening 4a of the outlet shown by the dashed line (in this embodiment, the cross-sectional area of the air introduction passage in the body) mesh 1, where the area ratio of the openings between the meshes is approximately 50%.
8, the opening area B effective for air flow is approximately equal to the area of the opening 4a of the discharge port.

Three plates 22, 23 and 2 forming the damper
4 is held horizontally so that the effective opening area A for passing the air flow in the air introduction path is made equal to B, and the aqueous foam solution with a pressure of 5 kg/cm ² is emitted from the nozzle 1 to achieve a foaming ratio of 500 to 500. Released 550 times more bubbles. When the three plates 22, 23 and 24 are rotated vertically to block the air introduction path at the dotted line 32,
Since the total area of the eight through holes 25 is approximately 40% of B, the foaming ratio is increased to 250 by the air flow passing through the openings made up of these eight through holes 25.
It was possible to change the magnification by a factor of 300 to 300.

The starting pipe 11 branches from the three-way joint 33, one pipe supplies water to the upper end 34 of the piston 14 via the three-way solenoid valve 12a, and the other pipe supplies water to the upper end 34 of the piston 14 via the three-way solenoid valve 12a.
It is connected to the lower end 35 of the piston via b.
When operating this piston 14, the three-way solenoid valve 12a is opened, another three-way solenoid valve 12b is closed, water is supplied from the upper end 34, and the piston is pushed down.
Then, the actuating rod 28 is lowered to close the damper. When the damper is opened, the three-way solenoid valve is operated in the opposite direction to switch the passage of pressure water, the actuating rod 28 is raised, and the water in the piston is discharged from the drain passage 15a of the three-way solenoid valve 12a.

These operations are not performed manually but by remotely operating the three-way solenoid valves 12a and 12b.

In FIG. 5, the actuating rod 28 is connected at its upper end to a piston rod 36 protruding from the piston 14 by an articulated joint 37, and is provided with other articulated joints 38a, 38b and 38c at three locations at the center and lower end, respectively. It is connected to an intermediate rod 39. The other end of the intermediate rod 39 is connected to a damper shaft 26 by an intermediate joint 27, and the damper shaft 26 has a damper shaft bearing 1 fixed to the side wall of the foamer body.
6, a plate 22 is attached which rotates within the main body.

When the piston 14 is actuated as described above, the piston rod 38 is lowered, and the actuating rod 28 is connected to the four joints 37, 38a, 38 from the upper end to the lower end.
While rotating b and 38c, it descends while maintaining a substantially vertical state. At this time, the three joints 38a, 38b, and 38c at the center and lower ends follow the trajectories shown by arrows 40a, 40b, and 40c, respectively, and descend to the position shown by the dotted line 41, and the damper shaft 26 is shown near the intermediate joint 27. The plate 22, 23 and 24 are rotated through an angle of about 90 DEG as shown by another arrow 42, and then stopped in a vertical position, as shown in FIG.

FIG. 7 shows a damper structure attached to the air intake port 8 according to another embodiment of the present invention, and FIG. 8 is an explanatory diagram showing the state when the damper is in operation.

In FIG. 7, an insect screen 21 is stretched near the expanded air intake port 8, and a damper structure is provided between the insect screen and the air intake port.

A piston rod 36 of the piston 14 installed on the main body is connected to two actuating rods 28a and 28b via a three-way joint 36, and one actuating rod 28a is connected to the intermediate joint via an intermediate rod 39 by another joint 38. It is connected to 27. A damper shaft 26 with a damper plate 22 mounted thereon is held in the body near the air intake 8 by a damper bearing 16 and its upper end is connected to an intermediate joint 27 . A damper plate 23 is similarly connected to the other actuating rod 28b.

In this embodiment, the two damper plates 22 and 23 are in contact with the left and right side walls of the air intake port 8,
Approximately 50% of the area is missing in the center, and it is placed at a distance from the insect screen 21. Although not shown in the drawings, the piston 14 is connected to two three-way solenoid valves and a thin conduit so as to be operated by pressurized water.

When the piston 14 is actuated in FIG. 7, the piston rod 36 is retracted into the piston 14, and the actuating rod 28a and the intermediate rod 39 are actuated via the joints 37 and 38, and the damper shaft 26 is actuated.
is rotated to open the damper plates 22 and 23 as shown in FIG.

This invention attaches a damper with a simple structure to the air introduction path of a foamer, and allows it to be reliably opened and closed by operating a solenoid valve from a remote location without using human power. This foamer is equipped with a damper that can open or close only a portion of the damper, and by opening and closing the damper, the foaming conditions can be quickly changed during foaming work. It is extremely useful for use in foamers etc. installed on top.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a left side view thereof, Fig. 3 is a right side view thereof, Fig. 4 is an explanatory cross-sectional view thereof, and Fig. 5 is a perspective view of the damper structure. Fig. 6 is an explanatory diagram showing the state during operation,
FIG. 7 is a perspective view showing a damper structure according to another embodiment of the present invention, and FIG. 8 is an explanatory view showing its operating state. 1...Nozzle, 4...Bubble discharge port, 8...Air intake port, 22, 23, 24...Plate.

Claims (1)

[Scope of utility model registration request] In a foamer comprising a nozzle built into the center of a main body having a foam outlet at one end and an air intake at the other end, a damper consisting of a pivotable plate is connected from behind the nozzle to the air intake. A foaming device with a damper located in an air introduction path so that only a part of the air introduction path can be opened or closed.