JPH0447514Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an automatic drain tank for a fire pump or the like that is capable of automatically draining water rather than a pump that can suck and drain water after bleeding air.

[Prior Art] Conventionally, fire pumps and the like are constructed by connecting a drain tank to the lower part of a suction/drainage pump casing that communicates with a water suction pipe and a vacuum pump, as shown in Japanese Utility Model Application No. 62-38493. Second, the drain had a structure that required manual operation of the drainage pot.

[Problems that the invention aims to solve] With such a structure, the drain kettle must be manually operated each time the operation is started or finished, which is cumbersome, and it is easy to forget to close the drain kettle at the start of operation. Doing so may cause inconveniences such as the inability to drive, and
The centrifugal pump as seen in the above-mentioned publication has the problem that if the drain tank is forgotten to open, the centrifugal pump freezes and is damaged.

[Means for solving the problem] The present invention solves such problems and enables the drain stock to open and close automatically. Therefore, the drain stock is connected to the inside of the drain stock that communicates with the lower part of the pump casing. The upper valve seat, the upper valve seat that communicates with the pump casing side, and the lower valve seat that communicates with the outside of the machine are formed at intervals, and the space between the two valve seats is in contact with both valve seats to prevent blockage. The ball is interposed so that it can be supported by a bullet at the center between both valve seats.

[Function] Therefore, when the pump is stopped, the ball is located between both valve seats and drain can be removed from the pump, and when the pump is started, air is removed by the vacuum pump and the ball is located between the valve seats. The water is absorbed by the upper valve seat, preventing air from being taken in from the drain tank. Also, when the water absorption is completed and water enters the pump and the pump is operated, The water pressure in the pump casing forces the ball against the lower valve seat, allowing the drain tank to remain closed.

[Example] Next, the embodiment shown in the drawings will be described.

FIG. 3 shows a perspective view of the entire fire pump, in which a bent water suction pipe 1 is connected to a side water suction port 3a of a pump casing 3 in which an impeller 9 having guide vanes 9a is installed. The opening 10 formed in the upper part of the pump 3a is connected to the lower part of the water stop valve part A, and the water discharge part 12 with the water discharge valve operating handle 11 is connected to the upper part of the pump casing 3, similar to the conventional structure. Configure.

In addition, the water stop valve section A has a valve body 14 installed above the strainer 13 that communicates with the opening 10 so as to be openable and closable, and a diaphragm 15 stretched upward and the valve body 14 are connected to each other by an operating shaft 16. A compression spring 17 is interposed below the diaphragm 15, and a check valve 19 and a drain pipe are connected between the upper part of the water stop valve section A and the connecting pipe 18. A check valve type drain valve 21 communicating with the connecting pipe 18 is interposed, and a drain pipe 2 is connected to the other end of the connecting pipe 18.
The vacuum pump 2 having two vacuum pumps 2 is connected in communication with each other.

A drain stock 4 is installed vertically from the bottom surface of the lower part of the pump casing 3, and a filter 23 is attached to the opening 4a at the top of the drain stock 4 that communicates with the bottom surface of the pump casing 3. An upper valve seat 5 that is in the shape of a truncated cone and communicates with the upper valve seat 5, and a lower drain port 4 that opens to the outside of the machine.
a lower valve seat 6 that is in communication with b and has a truncated conical shape;
A rubber ball 7 is formed at intervals between the valve seats 5 and 6, and a rubber ball 7 that can contact and close the valve seats 5 and 6 is placed downwardly in the center between the valve seats 5 and 6. It is constructed so that it can be supported by a coil spring type bullet 8.

Therefore, when starting the pump, vacuum pump 2
The pumped water sucked by the operation flows to the water stop valve A side and air is vented, but the inside of the pump casing 3 becomes negative pressure due to the suction action of the vacuum pump 2, and the drain tank The ball 7 in 4 is connected to the upper valve seat 5 as shown by the imaginary line.
This means that the drain tank 4 can be automatically closed to prevent outside air from being drawn in.

When the water suction is completed and water enters the pump casing 3, the water pressure accompanying the suction and drainage due to the rotation of the impeller 9 causes the ball 7 in the drain tank 4 to move downward as shown by the imaginary line. Valve seat 6
This means that the drain tank 4 can be closed automatically to prevent water leakage.

Also, when the pump stops, no pressure is applied inside the drain tank 4, and the ball 7 is moved to the projectile 8.
Due to this support, the drain tank 4 is located in the center between the valve seats 5 and 6, and the drain tank 4 is automatically opened to drain water from the pump casing 3.

[Effect of the invention] As described above, the present invention makes it possible to bring the ball 7 in the drain tank 4 into contact with one of the valve seats 5 and 6 or to position it between them when the pump is stopped. Nari, Drenkotoku 4
The opening and closing of the drain can be operated automatically, which means that the drain can be operated reliably and efficiently without the hassle of manual operation, or if you forget to do it and become unable to operate. It has the advantage of being suitable for implementation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of an embodiment of the present invention.
Figure 2 shows a cross-sectional view of a part of the fire pump;
The figure shows a perspective view of a fire pump. 1... Water suction pipe, 2... Vacuum pump, 3... Pump casing, 4... Drain kettle, 5... Upper valve seat, 6... Lower valve seat, 7... Ball, 8... Bullet machine.

Claims (1)

[Scope of utility model registration request] A drain tank 4 is installed at the bottom of the suction and drainage pump casing 3 that communicates with the water suction pipe 1 and the vacuum pump 2.
In a fire pump, etc., which is configured by consecutively disposing a drain tank 4, an upper valve seat 5 communicating with the pump casing 3 side and a lower valve seat 6 communicating with the outside of the machine are provided inside the drain stock 4 communicating with the lower part of the pump casing 3. A ball 7 is formed between the valve seats 5 and 6 at a distance from each other, and a ball 7 that can contact and close the valve seats 5 and 6 is inserted between the valve seats 5 and 6 by a bullet 8 on the center side between the valve seats 5 and 6. An automatic draining pot characterized by being constructed by being interposed so that it can be supported.