JP2001037902A - Fire pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To jet water by communicating a vacuum pump and a water jetting pipe from a water jetting mouth automatic check valve to a water jetting cock with a suction pipe. SOLUTION: A water suction pipe 6 provided at a water suction cock 5 is connected with a water suction side of a main pump section 4 of a pump main body 1, and a water jetting mouth automatic check valve 7 is connected with a water jetting side. A water jetting cock 8 is connected through a water jetting pipe 9 with the water jetting mouth automatic check valve 7. An air suction mouth 3A of a vacuum pump 3 and the water suction pipe 6 are connected with an air suction pipe 10 providing a flow switch 11, a check valve 12, and a water stop valve 13 in the middle. An upper section of a valve box 14 of the water jetting mouth automatic check valve 7 is provided covered with a lid body 18 having a hollow section 17 for sliding a valve rod in which a valve rod 16 of a valve 15 slides. This constitution surely makes it possible to jet water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire pump for use in a fire pump car or the like that absorbs water from a river, a fire prevention water tank, or the like.

[0002]

2. Description of the Related Art In a conventional fire fighting pump, a vacuum pump of a pump body is connected to a suction pipe only by a suction pipe, and a flow switch, a check valve, and a water stop valve are provided in the middle of the suction pipe. .

[0003]

In many cases, water is discharged from a fire pump vehicle by water absorption from a river, a fire prevention water tank, or the like as a water source. In this case, the fire pump vehicle is equipped with a water pump to absorb water from the water surface to the pump. This is done by discharging the air in the main pump and the water intake conduit by a vacuum pump. In this case, the water discharge port automatic check valve closes the boundary between the main pump and the water discharge port automatic check valve side, and the main pump and the water suction conduit are evacuated and water is absorbed.

On the other hand, due to the function of the water outlet automatic check valve, the air in the water discharge conduit from the check valve to the water outlet cock remains without being removed. For this reason, when the extension of the hose is completed and the water discharge cock is opened and water is discharged,
The non-discharged residual air flows back to the main pump, and in some cases, may fall into the water or become unable to discharge water, causing a delay in fire fighting. Further, even if water is discharged, the first water discharge has a problem that the residual air and water are mixed and the water discharge becomes unstable.

In view of the above, the present invention discharges residual air in a water discharge conduit from a water discharge port automatic check valve to a water discharge cock,
An object of the present invention is to provide a fire fighting pump that can prevent water from being unable to be discharged and can surely discharge water.

[0006]

In order to solve the above-mentioned problems, in the fire fighting pump according to the present invention, a suction pipe connects a vacuum pump of a pump body and a water discharge pipe from a water discharge port automatic check valve to a water discharge cock. It is characterized by the following. or,
In the fire fighting pump of the present invention, the vacuum pump of the pump body and the valve rod sliding hollow portion of the water outlet automatic check valve are connected by a suction pipe, and a water stopping packing is provided at the base of the valve rod. It is a feature.

According to the present invention having the above structure, since the vacuum pump of the pump body and the inside of the water discharge conduit from the water discharge port automatic check valve to the water discharge cock are communicated by the suction pipe, the residual air in the water discharge conduit is discharged. Then, the inside of the water discharge conduit is in a vacuum state. In addition, if the suction pipe is connected to the valve rod sliding hollow part, it is only necessary to provide a water stop packing at the base of the valve rod for stopping water, and a flow switch, a check valve, a water stop valve is newly provided on the suction pipe. Since it is not necessary to provide the structure, the structure is simplified.

That is, since the water stop packing is provided at the base of the valve stem of the automatic water discharge check valve, the valve body rises at the time of water discharge, and the water stop packing at the base of the valve stem is a valve rod sliding hollow. Since the contact portion abuts on the end of the portion and closes the gap between the inner edge of the valve stem sliding hollow portion and the outer peripheral surface of the valve stem, water does not enter the valve stem sliding hollow portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the fire fighting pump of the present invention according to claim 1, FIG. 2 is a sectional view showing an embodiment of the fire fighting pump of the present invention of claim 2, and FIG. It is an expanded sectional view.

In FIG. 1, 1 is a pump main body, 2 is a pump main body 1, and a vacuum pump 3 of the pump main body 1 is shown.
This is a drive unit of the pump body that drives the pump. The main pump unit 4 of the pump body 1 is connected to a water suction conduit 6 provided with a water suction cock 5 on the water suction side, and the water discharge side is connected to the water discharge port automatic check valve 7 on the water discharge side. Further, a water discharge cock 8 is connected to the water discharge port automatic check valve 7, and the water discharge cock 8 is formed from the water discharge port automatic check valve 7 to the water discharge cock 8.

Reference numeral 10 denotes a suction pipe communicating between the suction port 3A of the vacuum pump 3 and the water suction conduit 6.
Flow switch 11, check valve 12, water stop valve 1 in the middle of 0
3 are provided respectively. The water outlet automatic check valve 7 is provided with a lid 18 having a valve rod sliding hollow portion 17 in which the valve rod 16 of the valve 15 slides on the upper part of the valve housing 14. 19
Is branched by a three-way valve 20 in the middle of the suction pipe 10 between the vacuum pump 3 and the flow switch 11, and the water outlet automatic check valve 7
A suction pipe connected to a water discharge pipe 9 extending from the water discharge cock 8 to the water discharge cock 8.
A check valve 22 and a water stop valve 23 are provided, respectively.

Next, in FIG. 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals. FIG. 2 shows that the suction pipe 24 is branched by the three-way valve 20 in the suction pipe 10 between the vacuum pump 3 and the flow switch 11 and is connected to the top of the valve rod sliding hollow part 17 of the water outlet automatic check valve 7. I have. And
A hole 17A is formed at the top of the valve rod sliding hollow portion 17, whereby the air in the water discharge conduit 9 from the water discharge port automatic check valve 7 to the water discharge cock 8 is discharged from the suction pipe 24 through the hole 17A. In the drawing, reference numeral 25 denotes a ring-shaped water-stop packing provided at the base of the valve stem 16, and the rising of the valve 15 causes the inner edge of the inner opening of the valve-rod sliding hollow portion 17 to contact the outer peripheral surface of the valve stem 16. Close the gap.

Next, the operation of the fire fighting pump according to the present invention will be described. The first aspect is that the vacuum pump 3 is started and the water suction conduit 6 communicating with the vacuum pump 3 through the suction pipe 10 as in the related art is used.
The air in the water absorption conduit 6 and the main pump unit 4 is sucked and becomes vacuum. At this time, the water channel to the water discharge conduit 9 side is closed by the valve 15.

On the other hand, when the vacuum pump 3 is started, the vacuum pump 3
The residual air in the water discharge conduit 9 from the water discharge port automatic check valve 7 communicating with the suction pipe 19 to the water discharge cock 8 is sucked to be a vacuum. At this time, the water discharge cock 8 is closed. As described above, the pump body 1 is entirely in a vacuum state, and the water is filled in the water suction pipe 6 and the main pump section 4 through the water suction cock 5, the valve 15 is pushed up, and the water flows through the water discharge pipe 9 to the water discharge cock 8. Further, although water also enters the suction pipe 19 connected to the water absorption conduit 6, water does not pass any more because the water stop valve 23 is provided on the way. Therefore, when the water discharge cock 8 is opened, there is no residual air, so that water is immediately discharged.

According to a second aspect of the present invention, when the vacuum pump is started, the air in the water suction conduit 6 and the air in the main pump section 4 are sucked from the water suction conduit 6 side communicating with the suction pipe 10 as before, and a vacuum is created.
On the other hand, the residual air in the water discharge pipe 9 from the water discharge port automatic check valve 7 to the water discharge cock 8 is sucked from the hole 17A of the valve rod sliding hollow portion 17 communicating with the vacuum pump by the suction pipe 24, and the vacuum is removed. Become.

In a suction pipe 24 connected to the valve rod sliding hollow portion 17 of the water outlet automatic check valve 7, a water stop packing 25 provided at the base of the valve rod 16 raises the valve 15. At this time, water does not infiltrate because it sometimes comes into contact with the mouth edge of the hollow portion 17 for sliding the valve stem and closes the gap between the inside edge of the hollow portion 17 for sliding the valve stem and the outer peripheral surface of the valve stem 16.

[0017]

According to the present invention, since the vacuum pump of the pump body and the inside of the water discharge conduit from the water discharge port automatic check valve to the water discharge cock are connected by the suction pipe, the residual air in the water discharge conduit is discharged. When the vacuum pump of the pump main body and the hollow part for sliding the valve rod of the automatic water discharge port are connected with a suction pipe, the residual water in the water discharge pipe from the automatic water discharge port check valve to the water discharge cock is generated. Air is discharged from the valve rod sliding hollow, the inside of the water discharge conduit is evacuated, and if the water intake cock is opened, the water fills up to the water discharge cock. Without fail, reliable water discharge is possible.

When the suction pipe is communicated with the hollow portion for sliding the valve stem, when water is discharged, the seal for stopping water at the base of the valve stem abuts against the end of the hollow portion for sliding the valve stem, and the water is discharged. Since the gap between the inner edge of the hollow portion and the outer peripheral surface of the valve stem is closed, water does not enter the valve stem hollow portion. When the suction pipe is connected to the valve rod sliding hollow part, it is only necessary to provide a water stop packing at the base of the valve rod for stopping water, and a flow switch, a check valve, a water stop Since there is no need to provide a valve, the structure is simple and the cost is low.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a fire fighting pump according to the present invention.

FIG. 2 is a sectional view showing one embodiment of the fire fighting pump according to the present invention.

FIG. 3 is a partially enlarged sectional view showing an embodiment of the fire fighting pump according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump main body 2 Drive part 3 Vacuum pump 3A intake port 4 Main pump 5 Water intake cock 6 Water intake conduit 7 Water discharge port automatic check valve 8 Water discharge cock 9 Water discharge conduit 10 Suction pipe 11 Flow switch 12 Check valve 13 Water stop valve 14 Valve Case 15 Valve 16 Valve stem 17 Hollow portion for sliding valve stem 17A hole 18 Lid 19 Suction tube 20 Three-way valve 21 Flow switch 22 Check valve 23 Water stop valve 24 Suction tube 25 Water stop packing

Claims (2)

[Claims] 1. A fire pump wherein a vacuum pipe of a pump body and a water discharge pipe from a water discharge port automatic check valve to a water discharge cock are connected by a suction pipe. The vacuum pump of the pump body and the hollow portion for sliding the valve rod of the water outlet automatic check valve communicate with each other via a suction pipe, and a water-stop packing is provided at the base of the valve rod. Fire pump.