JPH02104825A - Freezing-proof method for fire-proof intake tap, and fire-proof intake tap - Google Patents

Abstract

PURPOSE:To simplify construction and operation and reduce a cost extremely by sealing an intake pipe at a fire-proof intake tap except the lower side end of the pipe, and by heightening internal pressure to keep the internal water level of the intake pipe lower than the external water level. CONSTITUTION:On the opening of a connecting pipe for composing an intake pipe 2 together with a linear main pipe, a cover body 14 is fitted via a flange section, a rubber packing, and the fitting band of a V type cross-sectional-area, and the intake pipe 2 is sealed except the lower side end. Besides, a connected port 4 to an air compressor 30 is set, and an air-coupler containing a check valve 5 and an internal pressure displaying means 6 for detecting internal air pressure are fitted on the connecting pipe. Then, by the compressor 30, pressure air S is sealed into the intake pipe 2, and the internal pressure is heightened, and an internal water level Li is lowered to the depth of an area to be unfrozen at least in the water of a water storage tank M, and the internal water surface of the intake pipe 2 is prevented from being frozen.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing freezing of a fire prevention water intake valve particularly in snowy and cold regions, and a fire prevention water intake valve capable of carrying out the method.

[Prior art and issues]

Fire prevention water intake valves in snowy and cold regions, which are installed underground under roads or attached to water storage tanks, prevent water in the intake pipes (
There was a problem in that water intake could not be started promptly in the event of an emergency such as a fire outbreak due to the freezing of water (surface).

Therefore, in order to solve such problems, the present applicant has already proposed a fire hydrant disclosed in Japanese Patent Application Laid-Open No. 62-1!1033. According to this fire hydrant, the valve body is vertically installed in the water storage tank, and the valve body is fitted into the water intake pipe so that it can be raised and lowered, and the water flow pipe integrated with the valve body is connected to the water intake part. The valve body is placed in a predetermined non-freezing area to prevent water from freezing inside the water intake pipe.

However, although such conventional fire hydrants can provide reliable antifreeze effects, they have problems that need to be solved, such as complicated structures, high costs, and complicated handling.

It is an object of the present invention to provide a method for preventing freezing of a fire prevention hydrant and a fire prevention hydrant that solve the problems existing in the prior art.

[Means to solve the problem]

The method for preventing freezing of a fire prevention hydrant according to the present invention is to prevent freezing of a fire prevention hydrant attached to the ceiling U of a water storage tank M buried underground, except for the lower end of the water intake pipe 2 in the fire prevention hydrant. It is characterized in that the internal water level Li of the water intake pipe 2 is maintained at a lower level than the external water level Lo by increasing the internal pressure.

Furthermore, the fire prevention water intake valve l according to the present invention is characterized in that the intake pipe 2 is configured to be able to be sealed, and is provided with an enclosure portion 3 in which a pressure fluid, for example, pressurized air S can be enclosed. do. In this case, the enclosing part 3 may have a built-in check valve 5 and a connection port 4 for the pressure fluid supply means, and the water intake pipe 2 may be provided with an internal pressure display means 6 that allows the internal pressure to be confirmed from the outside. .

[For production]

According to the method for preventing freezing of a fire prevention water intake valve and the fire prevention water intake valve 1 according to the present invention, 1. Since the water intake pipe 2 is sealed, the internal pressure increases by filling the pressure air S into the inside thereof. , the internal water level Lf decreases. Therefore, the internal water level L
If i is lowered to at least the depth of the non-freezing region in the water of the water tank M, freezing at the internal water surface of the water intake pipe 2 will be prevented.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

First, the schematic structure of the water reservoir to which the fire prevention hydrant 1 is attached will be explained with reference to FIG. 3.

M is a water storage tank buried underground, and the upper part is covered by a ceiling part U made of concrete or the like. Fire prevention water W is stored in this water tank M, and the symbol Lo indicates the water surface. In the ceiling U, there is a fire prevention water tap l according to the present invention.
is attached.

Next, the specific configuration of the fire prevention hydrant 1 will be explained with reference to FIGS. 1 and 2.

The water intake faucet l includes a water intake pipe 2 attached substantially perpendicularly to the ceiling U. The intake pipe 2 has a straight main pipe 11 whose middle part is fixed to the ceiling part U, and whose opening direction is perpendicular to the main pipe 11.
It consists of a connecting tube 12 which is threadedly connected to the upper end of the tube. The main pipe 11 is formed to have a diameter of about 10 cm, and its length from the ceiling U to about 2 m.
Provide a.

Further, the opening at the upper end of the connecting tube 12 can be sealed with a removable lid 14. That is, ring-shaped protruding flange portions 14λ and 121 are provided on the outer peripheral surfaces of the lid body 14 and the connecting pipe 12, respectively, and each flange portion 14a
The cover body 14 can be attached by overlapping the cover body 12a and pressing the cover body 12a with the attachment band 15 having a V-shaped cross section. Note that a rubber gasket 13 is interposed between each flange portion 14a and 12a to increase airtightness. Further, the mounting band 15 can be tightened and loosened using tightening bolts and nuts 16 provided at both ends. By using such a mounting band 15, airtightness can be significantly improved compared to a conventional lid that is screwed onto the fire hose connection screw 12b provided on the outer periphery of the connecting pipe 12. This has the advantage of being able to quickly perform a disengagement operation in an emergency.

On the other hand, a pressure gauge 17 (internal pressure display means 6) for detecting internal pressure is attached to the upper end of the connecting pipe 12, and the internal pressure is detected externally.
Configure it so that it can be checked especially from the front. "In addition, an air coupler 18 (enclosure section 3) that can enclose pressurized air S is attached to the back of the connecting pipe 12. Air coupler 18
is equipped with a connection port 4 for the near compressor 30 at its outer end, and also has a built-in check valve 5 (FIG. 3) for preventing backflow.

Next, a freezing prevention method using the fire prevention water intake valve 1 will be explained with reference to FIG. 3.

First, the connecting pipe 12 is fitted with the lid 14, and the opening at the lower end of the water intake pipe 2 is sealed.

On the other hand, a near compressor 30 is connected to the connection port 4 of the air coupler 18, and a 0.2 kg/am''
Supply pressurized air S at a certain level. As a result, the internal air pressure of the water intake pipe 2 increases, and the internal water level Li is gradually pushed down.

In this case, the relative change in the internal water level Li to be lowered is He, and the internal water level Li is set to be lower than at least the depth of the non-freezing area in the water outside.

Then, when the specified pressure air S is supplied 17 and the internal water level has been lowered to the target internal water level Li, the near compressor 30 is removed from the air coupler 18. At this time, the internal pressure is pressure gauge 1
7, so that, for example, periodic inspections are performed to maintain the internal pressure at all times.

Therefore, the internal water surface of the water intake pipe 2 is maintained at the same temperature as the water temperature under the non-freezing region, and the fire prevention water intake valve 1 is prevented from freezing.

The embodiments have been described in detail above, but does the present invention apply to such embodiments? It is not limited to this.

For example, the lid may be of a conventional screw type. In addition, the internal pressure display means may be a color display that can simply indicate whether the internal pressure is normal or abnormal, such as the exemplified pressure gauge, or it may be equipped with a communication means etc. that can notify a predetermined location in the event of an abnormality. good. The enclosing portion may be constructed of the illustrated air coupler or other means having the same function, and the check valve may be a mere air release means. In addition to air, the pressure fluid may be a gas that can maintain the required atmospheric pressure for a long period of time, or an antifreeze liquid that is separated from water. In addition, the pressure gauge and the enclosure part are attached to the lid body.
, the method of the present invention may be applied to an existing prevention water intake faucet. In addition, the configuration, shape, numerical values, etc. may be arbitrarily changed without departing from the gist of the present invention.

〔Effect of the invention〕

As described above, the method for preventing freezing of a fire prevention hydrant and the fire prevention hydrant according to the present invention seals the intake pipe except for the lower end of the fire prevention hydrant, and increases the internal pressure by Since the water level can be maintained at a lower level than the external water level, the structure is extremely simple, and by simplifying assembly and reducing the number of parts, costs can be significantly reduced. In addition, it is less prone to breakdowns and deterioration, and is highly reliable.
Easy to operate and no hassle 1. This has the effect of eliminating the problem.

[Brief explanation of the drawing]

Fig. 1 2 A vertical sectional view of the fire prevention water intake valve according to the present invention, Fig. 2:
A front view of the vicinity of the lid of the fire prevention hydrant; FIG. In the drawing, 1: Fire prevention water intake valve 2: Water intake pipe 3: Enclosed part 4: Connection port 5 double check valve 6: Internal pressure display means M: Water tank U: Ceiling S: Pressure air Li: Internal water level Lo: External Water Level Patent Applicant Takemura Seisakusho Co., Ltd. Representative Patent Attorney 2 1) Shigeru Figure 1 Figure 2 Figure 3 Figure 3 Shigeru -m- Director General of the Patent Office Yoshi 1) Moon Takeshi 1, Indication of Case 1988 Patent Application No. 258136 No. 2, Name of the invention Method for preventing freezing of fire prevention hydrants and fire prevention hydrants 3, Relationship to the case of the person making the amendment Patent applicant: 127 Kojima, Nagano City, Nagano Prefecture Takemura Manufacturing Co., Ltd. Representative: Toshio Takemura 4, Agent: 380 1393-35 Midoricho, Nagano City, Nagano Prefecture, Date of Amendment Order (Voluntary) 7, ``Preventive water intake faucet'' stated in page 8, line 10 of the detailed statement of amendments.
Corrected to "Fire prevention hydrant."

Claims (1)

[Scope of Claims] [1] A method for preventing freezing of a fire prevention water intake valve attached to the ceiling of a water storage tank buried underground, in which the water intake pipe of the fire prevention water intake valve is sealed except for the lower end, and the internal pressure is reduced. let it rise,
A method for preventing freezing of a fire prevention water intake valve, characterized by maintaining the internal water level of the water intake pipe at a lower level than the external water level. [2] In a fire prevention water intake valve attached to the ceiling of a water storage tank buried underground, the water intake pipe is configured to be airtight except for the lower end, and the intake pipe is equipped with an enclosure part capable of sealing a pressurized fluid inside the water intake pipe. A fire prevention water intake valve that is characterized by the fact that it has been installed. [3] The enclosure is equipped with a connection port to the pressure fluid supply means,
The fire prevention water intake faucet according to claim 2, further comprising a built-in check valve. [4] The fire prevention water intake valve according to claim 2, wherein the water intake pipe is provided with an internal pressure display means that allows the internal pressure to be confirmed from the outside.