JPS5910493Y2 - Freeze prevention device for liquid supply pipelines - Google Patents

Description

[Detailed description of the invention] The present invention is an anti-freeze device for liquid supply pipes.
For example, when the liquid supply is stopped in a liquid supply pipe such as a hot water supply pipe or a water supply pipe in a central heating system, the liquid stagnant in the liquid supply pipe may be removed, especially during the severe cold season. The pipes freeze when cooled by the low-temperature outside air, and the pipes burst due to the volumetric expansion caused by freezing.
In order to prevent such a situation, if the outside temperature drops to a temperature that could cause the water in the pipes to freeze when the liquid supply is stopped, a flow is created in the liquid in the pipes to cool down the water in the pipes. The present invention relates to an antifreeze device for liquid supply pipes designed to prevent liquid from freezing.

This type of anti-freeze device has conventionally used an electromagnetic water discharge valve installed in the pipeline that is opened when a thermostat connected to the valve detects an outside temperature below a certain level, and the water in the pipeline is continuously released. By creating a flow of water within the pipe,
Some systems are designed to prevent freezing, but in this case, not only is the cost high because it uses an electromagnetic water discharge valve, but there is also a large waste of liquid because water is continuously discharged when it is not in demand.
On the other hand, in order to save water at that time, if the diameter of the water discharge hole is made small and water is gradually discharged, the water discharge hole and electromagnetic water discharge valve will become clogged with scale and other substances in a short period of time. If the water gets stuck or freezes in the water discharge hole, making it impossible to release water, it is impossible to expect water to be discharged as expected, and as a result, it becomes impossible to reliably prevent pipes from bursting.

Therefore, it is conceivable to connect a timer to the electromagnetic water discharge valve so that the water is discharged intermittently, but in this case, since an electromagnetic water discharge valve is used, the cost will inevitably increase. In addition, it requires a timer, which has the disadvantage of further increasing costs.Furthermore, electromagnetic water discharge valves open and close with impact, so they are subject to significant wear and damage, and the timer Since the contacts are frequently turned on and off, they suffer from severe wear and tear, making it unreliable for reliable water spraying over a long period of time, or in other words, for the desired antifreeze effect.

The present invention was made in view of these circumstances, and
The purpose is to provide an antifreeze device for liquid supply pipes that has a relatively simple and inexpensive structure and can save water through intermittent water spraying, while also ensuring antifreeze functionality through reliable water spraying over a long period of time. It is.

In order to achieve the above object, the antifreeze device for liquid supply pipes according to the present invention includes a water discharge flow path equipped with an on-off valve that is normally biased in the closed direction from the middle of the liquid supply pipe. Opening/closing control that expands when heated to forcibly open the on-off valve against the urging force, and contracts when cooled to release the forced open action on the on-off valve. A mechanism is provided downstream of the on-off valve in the water discharge flow path, and generates heat when it is detected that the outside temperature or the liquid temperature in the liquid supply pipe becomes below a certain temperature. A heating device is attached to the opening/closing control mechanism.

The effects and effects exerted by the above characteristic structure are as follows.

In other words, when the outside temperature or the temperature of the liquid inside the pipe reaches a low temperature that could cause the water inside the pipe to freeze (a constant temperature set slightly higher than the freezing temperature), the heating device is activated to open or close the pipe. By heating and expanding the control mechanism, the on-off valve, which is normally biased to close, is slowly opened against the biasing force to release water in the pipe from the water discharge channel, causing water to flow into the pipe. This causes a flow of liquid to prevent freezing caused by stagnation of the liquid, but in this case, since the opening/closing control mechanism is provided downstream of the opening/closing valve in the water discharge channel, the discharge The entire body is cooled by the water and contracts, but since it is still heated, the contraction occurs relatively slowly compared to conventional electromagnetic release valves, and the opening/closing valve is closed by the biasing force.

Then, after a short period of time has elapsed after the closure, the control mechanism expands again due to heating, opens the on-off valve, and causes a flow of liquid in the pipe by discharging water.

Because water is discharged intermittently in this way, even if the diameter of the water discharge holes in the water discharge channel is increased, there is relatively little waste of liquid and water can be saved. There is no risk of clogging, and in particular, the on-off valve opens and closes slowly through the heating expansion and cooling contraction of the on-off control mechanism, so there is little wear and damage to the on-off valve, and reliable and good intermittent water discharge over a long period of time is possible. It came to be.

Furthermore, since the opening and closing of the on-off valve is performed by a simple on-off control mechanism that performs simple expansion and contraction, the overall structure can be simplified compared to the conventional one that is a combination of an electromagnetic water discharge valve and a timer. In particular, the closing movement of the on-off valve is automatically performed by cooling the on-off control mechanism using the low-temperature liquid itself released during opening, so no special parts are required for the closing movement. Therefore, the structure can be significantly simplified compared to the conventional one, and the cost can be significantly reduced.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows the overall general structure of the central heating system, which includes a hot water supply and heating circulation pipe 1 with a hot water circulation pump P interposed therein, and a type of liquid supply pipe with a collar 4 etc. connected to the tip. A hot water supply pipe 3 is led out from the boiler 2, and a freezing prevention device configured as below is attached to a portion of the hot water supply pipe 3 near the boiler 4. There is.

In addition, in this figure, Th is an outside temperature detection sensor.

As shown in FIG. 2, the antifreeze device includes a connecting pipe 3a that is connected to the hot water supply pipe 3 so as to protrude from the middle thereof.
A bottomed cylindrical pipe 6 with a large number of water discharge holes 6a bored in the bottom is connected to the pipes 3 and 6, and a water discharge is connected to the hot water supply pipe 3 inside these pipes 3 and 6. A water flow path 10 is formed, and a valve seat 7 that protrudes to the axial center of the hot water supply pipe 3 is fixed on the upstream side of the water discharge flow path 10, and An on-off valve 8 is provided which is normally biased in a certain direction by bombs 9, 9, and furthermore, a location located downstream of the valve seat 7 and the on-off valve 8 in the water discharge flow path 10,
That is, the on-off valve 8 is located at the inner bottom of the bottomed cylindrical pipe 6.
An opening/closing control mechanism 5 is fixedly installed for the opening/closing control mechanism 5.

The opening/closing control mechanism 5 for the opening/closing valve 8 controls the opening/closing valve 8.
A low melting point material (such as a wax element, etc.) having a high coefficient of body expansion is placed inside a bottomed cylindrical case, which faces the lower end protrusion and has a vertically slidable rod member 5a at its mouth. A substance that is solid and has a small volume at room temperature, but becomes liquefied or viscous and has a large volume when heated to high temperatures) is inserted, and an electric heating coil as a heating device is placed around the bottomed cylindrical case. It is constructed by winding C.

As shown in FIG. 3, the electric heating coil C is connected to a circulation pump P installed in the heating and hot water supply pipe 1 to prevent it from freezing, and its manual switch SW. The above-mentioned thermostat}Th installed outdoors and a remote control switch Rs that is closed by sensing a constant temperature are incorporated into an electric circuit together with another remote control switch Rs' linked to the remote control switch Rs. be.

According to the above structure, the thermostat {Th} senses the outside temperature below a certain level and activates the remote control switches Rs, Rs.
When ' is closed, the circulation pump P is activated to generate a flow of water in the heating and hot water supply pipe 1 to prevent it from freezing, and at the same time, by energizing the electric heating coil C and causing it to generate heat, The low melting point substance in the case is heated to expand the molten material, and the rod-shaped member 5a is slid upwardly, and the on-off valve 8 is pushed up against the bullets 9, 9 and separated from the valve seat 7, The water in the pipe line 1 is discharged through a water discharge channel 10 and a water discharge hole 6a...
... to the outside to cause a flow of water within the pipe 3, thereby preventing it from freezing.

When this water is discharged, the opening/closing control device 5 located in the water discharge channel 10 is entirely cooled by the water discharge, so that the low melting point substance contracts and the rod-shaped member 5a
is slid downward, and the opening/closing valve 8 is pushed down and closed by the biasing force of the bombs 9, 9, and water discharging is interrupted.

Since the discharged water is at a fairly low temperature, the low melting point substance continues to be heated by the coil C, but it remains contracted for a while after the on-off valve 8 is closed, and expands again after a short period of time, causing the on-off valve 8 to close. It will be revealed.

By repeating the above operations, water is sprayed intermittently.

Furthermore, when the outside temperature becomes higher than the above-mentioned constant temperature, the thermostat Th detects this and the remote control switch Rs
, Rs' are opened to stop the operation of the pump P and the heat generation of the coil C.

In addition, in the above example, we explained about preventing freezing of hot water supply pipes.
Of course, the present invention can also be used to prevent freezing of pipes that generally supply liquid, such as water supply pipes such as water pipes.

Furthermore, the thermostat Th may be installed within the liquid supply conduit.

[Brief explanation of drawings]

The drawings show an embodiment of the antifreeze device for liquid supply pipes according to the present invention, in which Fig. 1 is an overall schematic diagram of the central heating system, Fig. 2 is an enlarged sectional view of the main parts, and Fig. 3 is an electrical circuit diagram. 3...Liquid supply pipe line, 5...Opening/closing control mechanism, 8...Opening/closing valve, 10...Water discharge channel, C... ...Heating tool.

Claims (1)

[Scope of utility model registration request] A water discharge flow path 10 equipped with an on-off valve 8 that is normally biased in the closed direction is branched out from the middle of the liquid supply pipe 3, and expands when heated to close the on-off valve 8. The on-off valve 8 in the water discharge flow path 10 is connected to the on-off control mechanism 5 which performs a forced opening operation against the urging force, and contracts when cooled to release the forced opening operation with respect to the on-off valve.
A heating device C is attached to the opening/closing control mechanism 5, and is provided downstream of the opening/closing control mechanism 5, and generates heat when it is detected that the outside temperature or the temperature of the liquid in the liquid supply pipe 3 has fallen below a certain temperature. A freezing prevention device for a liquid supply pipeline, characterized in that: