JPH0443239Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is connected to the discharge side piping of the water discharge piping of a fire engine, and discharges water remaining in the discharge side piping, especially in the discharge bowl. This relates to an automatic drain valve that prevents freezing.

2. Description of the Related Art In general, as shown in FIG. 3, the water discharge piping of a fire engine is connected to a main pump 1 driven by a driving engine and a suction port 1' of the main pump 1, and is connected to a water source. A suction side pipe (not shown) that leads water to the main pump 1, and a discharge side pipe 4 that is connected to the discharge port 1'' of the main pump 1 via a non-return valve 2 and has a discharge ball stop 3 at its tip. , and a vacuum pump 5 attached to the main pump 1 for priming the main pump 1. In the drawing, the discharge side piping 4 extends from the check valve 2 in two directions; The tips of the discharge side pipes 4 are further branched into two pipes, each of which is located at a lower position than the above-mentioned check valve 2, and each of which has a discharge ball socket 3 disposed at each end. The hose is connected.

In the water discharge piping described above, after the firefighting operation is completed,
When the main pump 1 is stopped, the water inside the main pump 1 and the suction side piping flows back due to gravity and is discharged.
The water inside the discharge side piping 4 is removed because the tip opening of the discharge side piping 4 is located at a lower position than the check valve 2.
If the discharge ball pot 3 is left open, it will flow out naturally due to gravity. However, because water remains inside the discharge ball pot 3 attached to the discharge side piping 4 for structural reasons, the discharge of water from this portion has become an important problem. That is, as mentioned above,
When the water remaining in the discharge ball socket 3 freezes, it becomes impossible to open and close the discharge ball socket 3, and furthermore, the discharge ball socket 3 may be damaged.

Therefore, conventionally, as shown in the drawings, each discharge ball socket 3 is connected to a drain socket 6 that communicates with the inside of the discharge ball socket 3, and the drain socket 6 is manually opened and closed to allow each discharge ball socket 3 to
The water remaining inside was drained out.

Problems to be Solved by the Invention As mentioned above, in the past, the water remaining in the discharge ball pot 3 was drained by manually opening and closing the drain valve 6 connected to each discharge ball pot 3. This was complicated and troublesome, and there were cases where the operation of the drain valve 6 was forgotten.

Means for Solving the Problems The present invention provides an automatic drain valve that is connected to the discharge side pipe 4 of the water discharge pipe of a fire engine and that discharges water remaining in the discharge side pipe 4 to prevent the water from freezing. A valve chamber 27 having a valve seat 19 formed on the bottom surface, an inflow path 18 opening at the top of the valve chamber 27, and the valve chamber 2.
The valve body 10 has a discharge path 26 opening at the bottom of the valve body 7, and is housed in the valve chamber 27 with a predetermined gap, and has a required number of through holes 28 on the side surface.
The valve body 13 is made of a polyvinyl chloride resin. This is an automatic drain valve for preventing freezing of fire engines.

Embodiment FIG. 1 is a half-sectional view illustrating an automatic drain valve for preventing freezing of a fire engine according to the present invention.

In FIG. 1, 10 is a valve body formed by an upper body 11 and a lower body 12, 13 is a valve body,
14 indicates a coil spring.

The upper main body 11 has a tapered threaded part 15, a hexagonal surface part 16, and a male threaded part 17 integrally connected to each other for attachment to a discharge ball socket or the like. That is, an inflow path 18 is bored.

The lower body 12 includes a hollow body 22 in the form of a cylindrical bottom with a bottom surface having a conical surface 21 functioning as a valve seat 19 and a spring seat surface 20, and is integrally formed below the hollow body 22. A hexagonal surface 24 is provided on the outer periphery of the upper edge of the hollow body portion 22, and a female threaded portion 25 that is screwed into the male threaded portion 17 of the upper body 11 is threaded on the circumference. ing.
A discharge path 26 is formed in the axial direction of the drain pipe portion 23, and the upper end of the discharge path 26 opens approximately at the center of the conical surface 21 of the hollow body portion 22.

The upper main body 11 and the lower main body 12 have a male threaded portion 17 of the upper main body 11 and a female threaded portion 2 of the lower main body 12.
5 to form a valve body 10, and a valve chamber 27 in which the valve body 13 is accommodated is formed inside the valve body 10.

The valve body 13 is a polyvinyl chloride resin product, has a cylindrical shape with a bottom and is sized to form a predetermined gap with the valve chamber 27, and communicates with the hollow portion 13a of the valve body 13 on the side surface. A predetermined number of through holes 28 (four in the drawing) are formed, a flange 29 is formed on the upper edge of the outer periphery, and a step 30 is carved on the lower end of the outer periphery, and an O-ring 31 is fitted into the step 30. There is.

The coil spring 14 is disposed between a spring seat surface 20 formed on the lower main body 12 and the lower surface of the flange 29 of the valve body 13, and elastically biases the valve body 13 upward. The above coil spring 14
Since the valve body 13 that is elastically biased is made of polyvinyl chloride resin and is lightweight, it uses a material with extremely weak elastic force, and therefore the water pressure acting on the valve body 13 is extremely low. Also, the valve body 13 moves downward against the elastic force of the coil spring 14.

The installation procedure and operation procedure of the automatic drain valve having the above structure will be explained below.

First, instead of the drain pot 6 shown in Fig. 3,
The automatic drain valve of the present invention is installed using a tapered threaded portion 15 screwed onto the upper body 11.

Furthermore, one end of an extension pipe such as a vinyl hose or a rubber hose is connected to the tip of the drain pipe section 23 of the lower body 12, and the other end of the extension pipe is connected to the other end of the extension pipe so that the water drained by the automatic drain valve can be drained from the fire engine. Place it in an appropriate location so that it can be discharged outside the vehicle body.

Next, the operating procedure of the automatic drain valve will be explained.

When the fire engine is engaged in firefighting work, high-pressure water is supplied to the discharge side piping 4 shown in Figure 3.
The high-pressure water acts on the valve body 13 through the inflow path 18 of the automatic drain valve. As mentioned above, the coil spring 14 that biases the valve body 13 upward is made of a material with extremely weak elastic force, so the valve body 13 is instantly pushed down by the high-pressure water, and the O-ring 31
The discharge path 26 is closed by pressing against the valve seat 19 via the valve seat 19. Therefore, during firefighting operations, the automatic drain valve is always closed.

When the fire extinguishing work is completed and the main pump 1 is stopped,
The pressure of the high-pressure water in the discharge side piping 4 gradually decreases to a no-pressure state, and the pressure of the high-pressure water acting on the valve body 13 also gradually decreases, and at the point when it reaches a substantially no-pressure state, the coil The valve body 13 is pushed upward by the biasing force of the spring 14. Therefore, the discharge path 26 of the automatic drain valve is opened, and the above-mentioned unpressurized water flows through the inflow path 18, the hollow part 13a of the valve body 13, and the through hole 2.
8. Water is drained from the discharge path 26 via the valve chamber 27.

Note that the automatic drain valve according to the present invention includes a vacuum pump 5.
When the discharge ball pot 3 of the discharge side piping 4 is closed during the priming work of the main pump 1,
Since it functions as an air vent valve that discharges the air in the discharge side piping 4, not only the main pump 1 but also the discharge side piping 4 can be filled with water, and subsequent firefighting operations can be carried out quickly.

FIG. 2 is a drawing showing another embodiment of the present invention,
The only difference from the automatic drain valve shown in FIG. 1 is that the drain side opening of the drain path 26 is provided below the side surface of the lower main body 12. When the automatic drain valve of the second embodiment is used as shown in FIG.
This is used when space for connecting an extension pipe to the tip of the drain pipe section 23 cannot be secured.

Effects of the Invention As explained above, in the automatic drainage valve for antifreezing of fire engines according to the present invention, the valve body is made of polyvinyl chloride resin and is lightweight, and accordingly, the elastic force of the spring that biases the valve body is reduced. Since it can be set weakly, the operating pressure of the automatic drain valve can be set extremely low, and it has excellent operability and responsiveness to pressure. Therefore, after fire extinguishing work, water remaining in the discharge side piping of the fire engine, particularly in the discharge bowl can be automatically and completely discharged.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional view showing one embodiment of the automatic drain valve for antifreezing of a fire engine according to the present invention;
The figure is a half-sectional view showing another embodiment of the present invention, and FIG. 3 is a piping diagram illustrating water discharge piping of a general fire engine. 4...Discharge side piping, 10...Valve body, 13
... Valve body, 14 ... Coil spring, 18 ...
Inflow route, 19... Valve seat, 26... Discharge route, 2
7...Valve chamber, 28...Through hole.

Claims (1)

[Scope of utility model registration request] An automatic drain valve that is connected to the discharge side piping of a fire engine's water discharge piping and prevents water from freezing by discharging water remaining in the discharge side piping, and the valve chamber has a valve seat formed on the bottom surface. , a valve body having an inflow path opening at the top of the valve chamber and a discharge path opening at the bottom of the valve chamber, and a valve body housed within the valve chamber with a predetermined gap, and having a required number of through holes in the side surface. Consisting of a cylindrical valve body with a bottom and a spring that biases the valve body upward within the valve chamber,
An automatic drain valve for preventing freezing of a fire engine, characterized in that the valve body is made of polyvinyl chloride resin.