JPH0335910Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a T-shaped water intake introduction pipe for a fire pump. In other words, if it were a mountain, it would be raised high enough to form a watershed, and its greatest feature would be that it was a trifurcated pipe that descended in three directions. By removing the air from the ceiling of the confluence point and pumping water when the pump starts, it prevents water from being sucked in that would damage the vacuum pump, shortens the time until normal water discharge, and prevents water from falling when the pump is stopped. It was achieved.

FIG. 1 shows a conventional T-shaped water suction introduction pipe 1. The pumping air suction port 5 is located at the top of the water discharge pump 4. The introduction pipe 1 has an inflow portion 1a extending symmetrically to the water suction pipe 2, but one side is omitted from the drawing. A water intake pipe 2 and a water source W are connected to both sides via an on-off valve 3.
is connected. In the introduction pipe 1, left and right inflow portions 1a face each other directly, and an outflow portion 1b exits from the confluence point at right angles toward the suction port 4a of the water discharge pump 4.
Both the inflow part 1a and the outflow part 1b are horizontal, and the pump 4
It fits at the same height as the air inlet. This was a standard T-shaped water intake pipe suitable for fire engines.

Conventional water discharge pumps are not able to re-discharge water due to falling water while it is stopped (pumping up water again and starting the pump), pumping water,
No one thought that the long time required for normal water discharge and the tendency for vacuum pumps, clutches, etc. to break down were related to the shape of this T-shaped water intake and introduction pipe.

The applicant has previously developed a system in which a part of the water suction pipe connected to the suction port of the water discharge pump is installed above the pump, and air is sucked in from there to pump water, and a utility model application (Utility Model Publication No. 57-63991) is currently being filed. It is. As a result, the water in the water pump does not have to worry about falling water, and the amount of water pumped can be increased.
Obtained a reduction in pumping time. However, since air is removed from the ceiling of the conduit, water tends to get mixed in, and in order to prevent that moisture from reaching the vacuum pump via the suction pipe, equipment such as a moisture detection device in the suction pipe to stop the vacuum pump is required. It was hot.

As mentioned above, the present invention has almost solved the only problem of the above-mentioned invention pending application by making the T-shaped water suction pipe into a special shape.

Next, the configuration and implementation of this invention will be explained with reference to the drawings.

Figures 2 and 3 show one embodiment of this invention, and its outline is that the water intake introduction pipe is a three-pronged pipe that connects the suction port of the water discharge pump of a fire pump vehicle and the left and right water intake pipes in a T-shape. , it is a three-pronged pipe that descends sharply in three directions with the apex at the confluence of the three-pronged pipes, and the pipe axes of the left and right inlet inlets that connect to the left and right water suction pipes, and the outlet outlet that connects to the suction port are approximately The fire pump is horizontal, and the junction has a pumping air suction port connected to a vacuum pump on the ceiling, and the floor of the junction has dimensions that are higher than the ceiling of the water discharge pump suction port. This is a T-shaped water intake introduction pipe.

Let us compare the embodiment of the present invention shown in FIGS. 2 and 3 with the conventional one shown in FIG. The T-shaped water intake and introduction pipe 1 shown in FIG. 1 preserves an air layer a in the ceiling along its entire length. When pumping water, air is removed from the suction port 5 at the top of the water pump, but water and air coexist inside the pump, which has a complex structure.
An air layer a remains along the ceiling of the horizontal introduction pipe 1a.
Therefore, even after starting water spraying, it took some time to reach stable water spraying. It was also not uncommon for water to be discontinued due to falling water during temporary breaks.

According to this invention, during pumping, water flows horizontally from the inlets of the opposing inflow parts 10a, 10a of the T-shaped introduction pipe 10, and then moves upward toward the confluence P, which is a watershed, and collides at the confluence P. While the air changes its direction at right angles to the outflow portion 10b and flows down, the air is separated into the air reservoir a' on the confluence ceiling and is not brought into the water discharge pump as in the conventional case, so that good water discharge can be started immediately.
Even when only one side of the inflow section 10a is used, after colliding with water stagnant on the other side, the air turns at right angles and flows down, so air is still separated to the ceiling. In short, the confluence point is locally elevated, and the path of water rises to the top and then falls, allowing air to separate well from water. In addition, since the air pocket a' is concentrated in a relatively small area and has a high height, the water level detector 13 can be attached here so that the vacuum pump can be stopped when the air suction port 11 and the water surface are sufficiently far apart. , entry of water into the suction port 11 can be almost completely prevented. Therefore, it is no longer necessary to insert a water detection device between the suction port 11 and the vacuum pump, and the problems of the aforementioned patent application are solved.

The water level near the confluence point P in Figure 2 is drawn in two stages H ₁ and H _2. The upper H ₁ is the water level when the vacuum pump stops suction, and the lower H ₂ is the water level that has dropped due to the start of water discharge. shows. The air reservoir a' becomes a decompression chamber during water discharging, and the degree of vacuum at water level H ₁ becomes stronger as water level H ₂ increases, and this degree of vacuum is maintained even during water discharging by the suction force of water discharge pump 4. . Even if air moves along the pipe wall of the water suction pipe 2, it is stored in the air reservoir a' and does not enter the water discharge pump 4. When air is stored in the air reservoir a' and the water level at the confluence point P falls, the air can be removed at any time using a pumping vacuum pump. Installation of the water surface detector for this purpose is easy. Being able to completely capture the air that enters from the water suction pipe 2 and exhaust it with the pumping vacuum pump, and preventing air from entering the water discharge pump, allows the pump to fully demonstrate its performance and has a great effect on preventing water from falling during periods of rest. .

The embodiment shown in FIG. 4 is an example in which the pumping air suction ports 11 are distributed at a plurality of locations. In the case of the T-shaped water suction introduction pipe 10 of this invention, especially one inflow section 1
When 0a is closed and the vacuum pump is turned on to pump water, air tends to accumulate around the shoulder of the inlet 10a. Therefore, the air suction port 11 is also placed on the shoulder.
A branch pipe of the intake pipe 14 is connected to this. Of course, the main intake pipe 14 is connected to the suction port 11 on the ceiling of the confluence point P, but in this example, a suction chamber 12 is provided that protrudes further upward from the ceiling, and the suction port 11 is provided on the ceiling. There is. The water level detection device 13 is also provided at a correspondingly higher position to maintain a water level higher than H ₁ and H ₂ in FIGS. 2 and 3. If a plurality of suction ports 11 are provided at various locations, the suction ports 11 immersed in water will not suck water until all the suction ports 11 have exhausted the air, so that air can be efficiently removed. In experiments, the detection value of moisture in the intake pipe 14 decreased as the number of suction ports 11 increased from 3 to 5 locations. Even when the vehicle body is tilted at a fire scene, the suction ports 11 at multiple locations work effectively.

Note that the connection means between each suction port 11 and the suction pipe 14 and the shape of the suction port 11 are arbitrary, and the suction pipe 14 may be inserted into the pipe and branched, and the suction port 11 may be provided as appropriate, or the direction of the suction port 11 may be changed. It is left to the designer's discretion, such as orienting the wall to prevent running water and splashes from entering.

A small number of embodiments have been described above, but the main feature of this invention is that the T-shaped water intake and introduction pipe of the water discharge pump is made into a three-pronged pipe with the area near the AC point higher than the pump suction port and descending in three directions. to do,
There is a lot of room to take advantage of this feature and make changes and applications as appropriate to suit the implementation conditions. The T-shaped water suction introduction pipe is not limited to an integral pipe, and may be a joined pipe.

This idea takes the conventional water intake and introduction pipe, which is a T-shaped three-pronged tube, and changes it to a shape that rises from three horizontal inlets and outlets, with the confluence as the apex, and achieves the same effect as the aforementioned pending idea. In addition, while the water rising up the left and right inlets of the inlet pipe makes a sharp turn at the confluence point at the top and flows down the outlet, the air is separated into an air reservoir with a suction port on the ceiling of the confluence point and sent to the water discharge pump. enter. Conventionally, the water flow that entered the water discharge pump along with the air in the water suction pipe, but with this invention, all of the air is passed to the suction port of the air reservoir to fill the pump, so water can be discharged normally immediately after pumping. It became. Since the confluence point where air is separated to the ceiling is higher than the water pump suction ceiling even on its floor, the vacuum pump can be stopped and water pumping completed when the water pumping surface is sufficiently far away from the confluence ceiling and below. Therefore, even though the ceiling of the T-shaped water intake pipe was connected to the vacuum pump, it was possible to almost completely prevent water from entering the vacuum pump intake pipe.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional T-shaped water suction introduction pipe for a fire pump, Fig. 2 is an explanatory diagram of an embodiment of this invention, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a separate illustration. It is an explanatory diagram of an example. P... Merging point, 10... T-type water suction introduction pipe, 11
...Air suction port.

Claims (1)

[Scope of claim for utility model registration] (1) The suction port of the water pump of a fire pump vehicle,
In the water intake introduction pipe, which is a three-pronged pipe that connects the left and right water intake pipes in a T-shape, it is a three-pronged pipe that steeply descends in three directions with the confluence of the three-pronged pipes as the apex, and the left and right inflow pipes connect to the left and right water intake pipes. The pipe axes of the inlet and the outlet of the outflow section connected to the above-mentioned suction port are almost horizontal, the above-mentioned confluence point has a pumping air suction port connected to the vacuum pump on the ceiling, and the confluence floor section has the above-mentioned water discharge pump suction. A T-shaped water suction introduction pipe for a fire pump, characterized in that the relative dimensions are above the mouth ceiling. (2) Scope of Utility Model Registration Claims A T-shaped water suction inlet pipe for a fire pump, in which the air suction ports for pumping water are distributed at multiple locations through branch pipes.