JPS6144044Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a safety valve device used in a water pipe in a hot water supply device such as a first-stop type instantaneous water heater. The present invention relates to a safety valve device equipped with a safety valve device.

As shown in FIG. 1, this type of safety valve 1 generally has a valve body 2 inside the main body that is normally biased in the valve closing direction by a spring 4, and has a threaded portion 1A. A part of a water pipe such as a water heater (not shown) is interposed therein.

In such a safety valve, when the internal pressure of the water pipe increases, a force that presses the valve body 2 acts on the upstream side of the valve body 2, and if this force becomes larger than the preset biasing force of the spring 4, When the spring 4 contracts, the valve body 2 separates from the valve seat 3 to open the valve, and the increased pressure within the water pipe passes through the inside of the valve body 1 and is discharged to the outside from the opening 5 on the downstream side. Due to this operation, the volumetric expansion of the water in the water pipe is simultaneously discharged to the outside.

Here, the safety valve 1 is generally activated when an abnormal situation occurs and the water heating combustion device is activated, causing an abnormal increase in internal pressure, even though the faucet on the discharge side of the water pipe is closed. be. However, during normal use, for example, when the faucet is closed after hot water is drawn, a so-called lag phenomenon occurs in which the flow of water stops instantaneously but the combustion is delayed for several seconds before extinguishing the fire. Disadvantages that may cause inconvenient situations such as water leakage, and in the case of water heaters installed indoors, the water must be treated, and piping equipment is required for this purpose. It was hot.

Therefore, in view of the above-mentioned conventional circumstances, the present invention uses a safety valve device to absorb the volumetric expansion of water in the water pipe due to, for example, a rear drain, to prevent water from flowing out during general use. It is something.

Hereinafter, the present invention will be explained based on FIG. 2.

In FIG. 2, 11 is the valve body, 11A and 11B are water inlets and outlets provided at both ends of the valve body 11, respectively, and 11C is the inlet 11A of the valve body 11.
This is a threaded part formed on the side for connecting to a water pipe. 12 is an inlet port 11A in the valve body 11
The slide valve is disposed in the side space 17 and can slide along the inner peripheral wall of the valve body 11 in the space 17 via an O-ring 13 attached to the outer periphery. A through screw hole 12A is cut in the sliding valve 12, and a space 1 on the outflow port 11B side in the valve body 11 is formed.
A safety valve 1 having the configuration shown in FIG. 1 is attached to the 8 side.

Reference numeral 14 denotes a spring that always urges the sliding valve 12 to press against the inner end wall of the space 17, and is provided between the sliding valve 12 and the adjusting screw 15 screwed into the valve body 11 on the outlet 11B side. Intervened.

The biasing force of the spring 14 is set in advance so that the spring 14 contracts by sliding the slide valve 12 to absorb the volumetric expansion of water before the safety valve 1 operates by back-loading or the like.

In such a safety valve device, for example, if a lag occurs after closing the discharge side faucet of a water pipe of a water heater, and a pressure increase occurs due to volumetric expansion of water in the water pipe,
First, the slide valve 12 is changed from the closed state to the valve body 1 in the space 17.
1. At this time, the space 17 expands and absorbs the volumetric expansion of the water. That is, the space 17 expands before the opening operation of the safety valve 1 and absorbs the volumetric expansion of water generated in the water pipe.

On the other hand, in normal operation as a safety valve, the space 17 with the maximum predetermined volume is filled with water, and even though the pressure increase due to the volumetric expansion of the water has been absorbed, further pressure is added, and the safety valve 1 When the operating pressure is reached, the valve body of the safety valve 1 opens and the water in the water pipe flows out from the screw hole 12A, through the safety valve 1, and from the outlet 11B.

As explained above, according to the present invention, before the safety valve operates, a space is provided to absorb the volumetric expansion of water that occurs during general use such as after-drilling, and the inside of the valve body is slid to expand this space. By attaching a safety valve to a moving sliding valve, it is possible to prevent the situation in which the safety valve is activated due to rear firing during general use and the water in the water pipe flows out to the outside.
There are advantages in that there is no need to take any special measures to account for the volumetric expansion of water, such as there being no need to take the trouble to provide water outflow piping to a water heater or the like installed indoors.

Another advantage is that the conventional safety valve can be used as is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the general structure of a safety valve, and FIG. 2 is a longitudinal sectional view showing the structure of a safety valve device according to the present invention. 1... Safety valve, 2... Valve body, 4, 14... Spring, 11... Valve body, 12... Sliding valve, 17
……space.

Claims (1)

[Scope of utility model registration request] In a safety valve device that is installed in a part of the water pipe of a water heater, a space is provided in the valve body to absorb the volumetric expansion of water generated in the water pipe, and this space resists the elastic biasing force. is constructed such that it can be expanded by a sliding slide valve, and a hole is provided in the sliding valve, and a safety valve having an operating pressure higher than the operating pressure of the sliding valve is attached to the hole of the sliding valve. A safety valve device for a water heater, characterized in that the safety valve is configured to open when the pressure rises beyond the amount absorbed by sliding of the slide valve.