JPH0513999Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) Portable fire pumps are lightweight pumps with an engine that can be transported by hand and are easy to operate, making them indispensable for local firefighting activities. It is. It is especially effective in initial fire extinguishing by taking advantage of its maneuverability. This invention is intended to ensure that a portable fire pump continuously functions, and relates to a valve that prevents the inside of the pump casing from freezing at low temperatures.

(Prior Art) It is common knowledge that a drain tank is provided at the bottom of the pump casing of a conventional portable fire pump for draining water when the pump is stopped after operation.

(Problem that the invention aims to solve) With conventional portable fire pumps, if you forget to open the drain tank installed at the bottom of the pump casing, the water inside the pump casing will freeze under conditions where water freezes. , the impeller may become stuck and unable to rotate, or the pump casing may be damaged, making it impossible to start the pump.

This idea is intended to prevent this type of trouble from occurring.

(Means for Solving the Problems) This invention has a cylindrical valve body having an inlet on the upper side and an outlet on the lower side, and two valves in the valve body, one valve being the same as the above-mentioned valve body. It consists of a plate valve located in the center of the interior, which is biased upward in the valve opening direction by a spring, and a valve seat below the plate valve. By installing an antifreeze valve, which consists of a shape memory metal spring that is spring-like and contracts at low temperatures, a plate-shaped low-temperature valve integrally molded on the upper end of the spring, and a valve seat above the low-temperature valve, the pump This problem is solved by installing a valve that automatically drains water when the suction pipe is removed when the pump is in a stopped state and remains open regardless of the temperature when the pump is in operation.

(Function) The antifreeze valve of the portable fire pump of this invention opens only at low temperatures when the suction pipe is removed when the pump is not in operation, and automatically drains the water inside the pump casing. While the vacuum pump is operating, operate with the water discharge valve closed,
It has a structure that closes the valve even when water is being discharged or when the suction pipe is attached even when the pump is stopped (i.e., when the pump is temporarily stopped and then immediately on standby for restarting). ing.

(Example) This will be explained in detail below with reference to the drawings.

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a front view of the antifreeze valve, and FIG. 2 is an operational view of FIG. 1. FIG. 3 is a structural diagram showing the pump side 4 of a general portable fire pump, with the antifreeze valve of the present invention attached. The antifreeze valve 2 attached to the pump casing 1 shown in FIG. 3 has a structure as shown in FIG. 1.

The valve body 3 is equipped with a valve seat 5 that has sealing properties on both the upper and lower surfaces, and there is a plate valve 4 between them, a spring 6 on the lower side of the plate valve 4, and a coil spring shape that contracts at low temperatures on the upper side. A shape memory metal spring 7 is provided. In the figure, the upper spring end of the shape-memory metal spring 7 is provided with a low-temperature valve 8 integrally molded with a material having sealing properties.

Start the engine E shown in Figure 3, and use the vacuum pump.
When the VP is activated, the inside of the pump casing 1 suddenly becomes negative pressure, and in the state shown in FIG. 1 where the shape memory metal spring 7 is not activated, the low temperature valve 8 is already closed, so it is easy to create a vacuum.

The second shape memory metal spring 7 is activated.
In state A in the figure, by keeping the shape memory metal spring 7 and low temperature valve 8 lightweight,
Since the low temperature valve 8 is attracted to the upper part, it is possible to form a vacuum.

In the water discharge operation when the water discharge valve 9 shown in FIG. 3 is closed and opened, the inside of the pump casing 1 becomes positive pressure, so
The plate valve 4 changes from the open state to the closed state as shown in FIG. 2B, and no drainage action is performed.

Furthermore, when the pump is temporarily stopped for restarting with a suction pipe (not shown) attached and priming, the inside of the pump casing 1 is under negative pressure, and the plate valve 4 is closed as described above. Vacuum pump
It works in the same way as when VP is activated.

If you forget to stop the pump, remove the suction pipe, and open the drain tank (not shown) attached to the bottom of pump casing 1,
Since there is an atmospheric condition inside, the valve is normally in the closed state shown in Fig. 1, but when the temperature drops below the operating setting temperature of the shape memory metal spring 7, the shape memory metal spring 7 contracts and the antifreeze valve 2 closes. The valve enters the open state shown at A in FIG. 2, and the water accumulated in the pump casing 1 can be discharged.

(Effects of the invention) As described above, since water can be drained automatically at low temperatures, problems such as the impeller not being able to rotate due to freezing or damage to the pump casing do not occur in low temperature regions or during the winter. Further, in the vacuum pump operation state and the pump pressurization operation state, the valve is reliably closed to ensure the vacuum pump operation and the pump pressurization operation. Therefore, firefighting exercises and activities can be carried out safely and effectively.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a front view of the antifreeze valve of a portable fire pump, and FIG. 2 is an operational diagram of FIG. 1. FIG. 3 is a structural diagram of the pump portion of a general portable fire pump. 1... Pump casing, 2... Antifreeze valve, 4... Plate valve, 7... Shape memory metal spring, 8... Low temperature valve, E... Engine, VP... Vacuum pump.

Claims (1)

[Claims for Utility Model Registration] A valve body 3 having a cylindrical shape and having an inlet on the upper side and an outlet on the lower side, and two valves inside the valve body 3, one valve being inside the valve body 3. It consists of a plate valve 4, which is biased upwardly in the valve opening direction by a spring 6, and a valve seat 5 below the plate valve 4, and the other valve rests on the plate valve 4. The portable fire extinguisher is made up of a shape memory metal spring 7 that has a coil spring shape and contracts at low temperatures, a plate-shaped low temperature valve 8 integrally molded on its upper end, and a valve seat above the low temperature valve 8. Pump antifreeze valve.