JPH04130Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fire hydrant provided for taking out water for extinguishing fires.

[Conventional technology and its problems]

A fire hydrant is equipped with a valve and a hose connection port, and the outer surface of the valve body constituting the valve is provided with a rubber coating layer to improve water-stopping performance between it and the valve seat. However, since the valve body is bonded to the valve body only with an adhesive, the rubber coating layer peels off during use, resulting in the problem that the valve cannot maintain its water-stopping properties.

The object of the present invention is to provide a fire hydrant that solves the above problems.

[Means for solving problems]

The present invention forms a through hole that vertically communicates between the upper and lower surfaces of the valve body, which is approximately in the shape of an inverted truncated cone, and includes a rubber coating layer that covers the upper surface, inclined surface, and lower surface of the valve body, respectively. The valve body is integrally formed, and the through hole is filled with the rubber coating layer to form a rubber communication portion bridging between the upper surface coating layer and the lower surface coating layer of the rubber coating layer. It is something that

[Effect]

The upper surface covering layer and the lower surface covering layer are directly connected by the rubber communication part, and the resistance force against vertical movement or lifting of both covering layers and relative movement in the lateral direction with respect to the upper surface or lower surface of the valve body. give. Therefore, the coating layer will not peel off.

Therefore, the portion of the rubber coating layer that comes into contact with the inclined surface of the valve body is integral with both coating layers, and both coating layers are always kept in contact with the valve body, so that Movement in the direction parallel to the inclined surface is suppressed.

〔Example〕

The implementation of the present invention will be explained in detail based on the drawings.

In FIG. 3, 1 is a valve box, and a valve body 3 and a valve stem 4 are disposed in a valve chamber 2 inside thereof so as to be movable up and down. A valve seat 5 facing the valve body 3 is formed on the suction side of the valve box 1, and a hose connection port 6 is provided on the discharge side. The hose connection port 6 includes a base 7, a base lid 8, a fitting 9, and the like.

The upper side of the valve box 1 is open, and a top supporter 10 for supporting the valve stem 4, a female threaded top 11, and a packing box 17 above these are respectively attached. A cap 12 is provided at the upper end of the valve stem 4, and by rotating the cap 12, the valve stem 4 is screwed upward and downward relative to the female screw top 11.

To explain the connecting part between the valve body 3 and the valve stem 4, the threaded part 18 screwed into the lower end of the valve stem 4 has a further distal end portion inside the recess 14 formed in the valve body 13 of the valve body 3. It is said to have a protruding shape. in particular,
A concave circumferential groove 15 is attached to the valve stem 4, and a connecting bolt 16 passed through a predetermined portion of the valve body 3 is protruded into the concave circumferential groove 15 by an appropriate length. Therefore,
The rotation of the valve stem 4 causes the valve body 3 to come into pressure contact with the valve seat 5 without rotating.

As shown in FIGS. 1 and 2, the valve body 3 has an inverted truncated cone shape with the top of the cone cut off and its top and bottom turned upside down, and has almost the same external shape. It includes a valve body 13 made of gunmetal or the like. The valve body 13 has an upper surface 2.
0, an integral rubber coating layer 19 is formed to cover the inclined surface 21 and the lower surface 22, respectively. Further, the valve body 13 is formed with a through hole 23 that vertically communicates between the upper surface 20 and the lower surface 22, and furthermore, the through hole 23...
3... The inside is filled with the rubber coating layer 19 to form a rubber communication part 24..., and the rubber coating layer 19
The upper surface coating layer 25 and the lower surface coating layer 26 are bridged. A circumferential groove 27 is formed on the inclined surface 21 of the valve body 13.
. . . are attached thereto, and correspondingly, a circumferential convex portion 28 . The upper portion of the lower surface coating layer 26 is fitted into a recess 30 provided on the lower surface of the valve body 13. In addition,
In order to form the rubber coating layer 19 on the surface of the valve body 13, an adhesive is applied to each of the surfaces 20, 21, 22 in advance, and then placed in a mold of a predetermined shape and heated. Perform rubber vulcanization.

Thus, a water stop portion is formed by the valve body 3 coming into contact with the conical valve seat 5 at a predetermined pressure.
Among the rubber coating layers 19, especially the inclined coating layer 29,
A force in the direction of the arrow mark A in FIG.
8 acts as a resistance force. A part of the force in the direction of the arrow mark A acts on the upper surface coating layer 25, but due to the rubber communication portion 24... and the adhesive layer interposed between the upper surface 20 and the or any movement in the parallel direction is prevented.

A radial force is also applied to the lower surface coating layer 26, but apart from the adhesive force, peeling from the lower surface 22 is prevented by the portion that fits into the recess 30 and the rubber communication portions 24.

The cross-sectional shape of the rubber communication portion 24 or the through hole 23 may be any shape other than a circle, such as a rectangle or any other arbitrary shape. The arrangement locations can also be increased or decreased more freely than in the above embodiment.

[Effect of idea]

In this way, in the present invention, the rubber coating layer 19 covering the outer surface of the valve body 13 is integrally formed, and the rubber communication portion bridging between the upper surface coating layer 25 and the lower surface coating layer 26 is provided. 24, the upper surface coating layer 25 and the lower surface coating layer 26 are firmly connected in the direction perpendicular to their contact surfaces, and the coating layers 25 and 26 do not peel off from the valve body 13. Furthermore, since it is held in contact with the valve body 13, the sloped coating layer 29, which is connected to both the coating layers 25 and 26 at their upper and lower edges, is further prevented from moving relative to the valve body 13. , peeling is prevented.

As described above, according to the present invention, the rubber coating layer 19 on the surface of the valve body 3 does not peel off, and the water-stopping property can be maintained satisfactorily for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view showing a main part of an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional front view showing the entire fire hydrant according to the present invention. 3... Valve body, 13... Valve body, 19... Rubber coating layer, 20... Top surface, 21... Inclined surface, 22...
...Bottom surface, 23...Through hole, 24...Rubber communication part, 2
5... Upper surface coating layer, 26... Lower surface coating layer.

Claims (1)

[Scope of utility model registration request] A through-hole 23 is formed that vertically communicates the upper surface 20 and lower surface 22 of the valve body 13 in the shape of an approximately inverted truncated cone,
Further, a rubber coating layer 19 that covers the upper surface 20, inclined surface 21, and lower surface 22 of the valve body body 13, respectively, is integrally formed, and the through holes 23 are filled with the rubber coating layer 19. A fire hydrant characterized in that it includes a valve body 3 in which a rubber communication portion 24 is formed to bridge between an upper surface coating layer 25 and a lower surface coating layer 26 of the rubber coating layer 19.