JP6059177B2 - Freezing prevention device - Google Patents

Description

  The present invention relates to an anti-freezing device that is attached to a water pipe and prevents the water in the water pipe from freezing.

Conventionally, as this type of antifreezing device, a cylindrical main body whose upper end is connected to a water pipe, an inflow chamber communicating with the water pipe provided in the main body, and a valve port communicating with the inflow chamber at the upper end A drainage passage in the main body extending downward from the valve opening, a cylindrical working chamber in the main body surrounding the drainage passage, and a valve body capable of sealing the working chamber from above and closing the valve opening from above And a spring that urges the valve body to the lower closed side, the water in the working chamber freezes and expands, and the valve body resists the urging force of the spring by the expansion pressure generated by this freezing and expansion. It is known that the water in the water pipe is discharged from the inflow chamber through the valve port and the drainage passage (see, for example, Patent Document 1).

  According to this, when the temperature becomes 0 ° C. or lower, the retained heat of the water in the working chamber is released to the outside, and the water in the working chamber is frozen and expanded. Then, the valve body moves to the upper opening side, the valve port is opened, the water in the water pipe is discharged from the inflow chamber through the valve port and the drainage passage, and the water pipe is promoted Prevent freezing of the water inside. At the same time, the retained heat of the water flowing through the drainage passage is transferred to the ice in the working chamber and thawed. Then, due to the thawing and shrinking of the ice in the working chamber, the valve body moves to the lower closing side, the valve opening is closed, and the discharge of water in the water pipe is stopped.

  However, in the above-mentioned conventional example, it takes time to defrost the ice in the working chamber with water flowing through the drainage passage, and it takes time to defrost and the amount of water discharged from the water pipe increases.

Japanese Patent No. 3983118

  In view of the above points, an object of the present invention is to provide an anti-freezing device that promotes thawing of a working chamber so that the amount of water discharged from a water pipe can be reduced.

In order to solve the above problems, the present invention is a freeze prevention device that is attached to a water pipe and prevents the water in the water pipe from freezing, and a cylindrical main body having an upper end connected to the water pipe, An inflow chamber communicating with the water pipe provided in the main body, a valve port communicating with the inflow chamber at the upper end, a drainage passage in the main body extending downward from the valve port, and a cylindrical shape in the main body surrounding the drainage passage The working chamber is sealed from above, the valve body can be closed from above, and a spring that biases the valve body to the closed side below. Then, the valve element moves upward against the biasing force of the spring by the expansion pressure generated by this freezing and expansion , and the water in the water pipe is discharged from the inflow chamber through the valve port and the drainage passage. When the valve body is moved upward, the valve port is opened and the valve body is operated. Is released sealing chamber, water in the water pipe and wherein the flow into the working chamber from above through the inlet chamber.

  According to the present invention, the ice in the working chamber is thawed with the water flowing through the drainage passage, and the water in the water pipe flows into the working chamber from above through the inflow chamber, so that the ice in the working chamber is directly thawed. Therefore, the ice in the working chamber can be thawed quickly to reduce the amount of water discharged from the water pipe. The sealing of the working chamber may be released not only at the same time that the valve opening is opened, but also after the valve opening is opened.

Sectional drawing which shows the state by which the operating chamber of the anti-freezing apparatus of embodiment of this invention was sealed, and the valve opening was obstruct | occluded. Sectional drawing which shows the state by which the valve opening of the freezing prevention apparatus of embodiment was opened and the sealing of the working chamber was cancelled | released.

  1 and 2, reference numeral 1 denotes an antifreezing device according to an embodiment of the present invention that is attached to a water pipe 11 and prevents water in the water pipe 11 from freezing. The water pipe 11 is connected to, for example, a water pipe or a water storage tank, and a water supply pressure is always applied. Moreover, the freeze prevention apparatus 1 is provided with the cylindrical main body 2 by which an upper end part is connected to the T-shaped coupling 12 interposed in the middle of the water piping 11. FIG. An insert 3 is inserted into the main body 2. In the insert 3, the flange 31 provided at the lower end thereof abuts the lower end of the main body 2, and the fitting portion 32 provided above the flange 31 is fitted to the inner peripheral surface of the main body 2, It is fixed to. A sealing property is secured between the main body 2 and the insert 3 by an O-ring 33. Further, the internal space of the main body 2 other than the portion where the insert 3 is provided constitutes the inflow chamber 4 communicating with the water pipe 11.

  The insert 3 has inner and outer double cylindrical portions 34 and 35 extending upward from the fitting portion 32. A valve port 51 communicating with the inflow chamber 4 is formed at the upper end of the inner cylinder portion 34, and a drainage passage 5 extending downward from the valve port 51 and penetrating the fitting portion 32 is formed inside the inner cylinder portion 34. Forming. In addition, a cylindrical working chamber 6 that surrounds the drainage passage 5 is formed between the inner cylindrical portion 34 and the outer cylindrical portion 35, and the working chamber 6 communicates with the inflow chamber 4 at the lower end portion of the outer cylindrical portion 35. A communication hole 61 is formed.

  The anti-freezing device 1 further includes a valve body 7 that seals the working chamber 6 from above and can close the valve port 51 from above. The valve body 7 includes an upper plate portion 71 and a cylindrical portion 72 that extends downward from the upper plate portion 71 and is fitted to the inner cylindrical portion 34. An O-ring 73 is attached to the outer peripheral surface of the lower end portion of the cylindrical portion 72, and this O-ring 73 is seated on the upper end portion of the outer cylindrical portion 35 to seal the working chamber 6. Further, a valve packing 74 is mounted on the lower surface of the upper plate portion 71, and the valve packing 74 is seated on the upper end of the inner cylinder portion 34, thereby closing the valve port 51 from above. Further, a spring 8 is contracted between the upper end portion of the main body 2 and the valve body 7, and the valve body 7 is urged downward on the closed side.

  Here, there is a minute gap between the cylindrical portion 72 and the inner cylindrical portion 34 of the valve body 7, and when water from the inflow chamber 4 flows into the working chamber 6 from the communication hole 61, the air in the working chamber 6 Is deaerated through the minute gap, and the working chamber 6 is filled with water. Further, a discharge hole 75 is formed in the cylindrical portion 72 so as to communicate with the inflow chamber 4.

According to the above configuration, when the temperature becomes 0 ° C. or lower, the retained heat of the water in the working chamber 6 is released to the outside, and the water in the working chamber 6 is frozen and expanded. Then, the valve body 7 moves upward against the biasing force of the spring 8 by the expansion pressure generated by this freezing and expansion, the valve port 51 is opened, and the water in the water pipe 11 is discharged from the inflow chamber 4. It is discharged through the hole 75, the valve port 51, and the drainage passage 5, and the water in the water pipe 11 is prevented from freezing by encouraging the water flow. At the same time, water having a relatively high temperature in the water pipe 11 that is not affected by freezing of the working chamber 6 flows through the drainage passage 5, and the heat retained in this water is transferred to the ice in the working chamber 6 and is thawed. . Then, due to the thawing contraction of the ice in the working chamber 6, the valve body 7 moves to the lower closing side, the valve port 51 is closed, and the discharge of water in the water pipe 11 is stopped.

  In addition, when the insert 3 is made of a metal having good thermal conductivity, when the water in the working chamber 6 is frozen, the communication hole 61 is closed early due to the freezing of the water in the hole. The minute gap between the portion 72 and the inner cylinder portion 34 is also closed early by freezing in the gap. Therefore, the expansion pressure due to the freezing and expansion of water in the working chamber 6 does not leak from the communication holes 61 and the minute gaps, and the valve body 7 reliably moves upward.

  However, if the ice in the working chamber 6 is simply thawed with water flowing through the drainage passage 5, it takes time to thaw, and the amount of water discharged from the water pipe 11 increases when the water supply pressure is applied. End up.

  Therefore, in the present embodiment, when the valve body 7 moves to the upper opening side, the valve port 51 is opened and the O-ring 73 is separated from the upper end of the outer cylinder portion 35 as shown in FIG. 7 is released, and the water in the water pipe 11 flows into the working chamber 6 from above via the inflow chamber 4.

  According to this, ice in the working chamber 6 is thawed with water flowing through the drainage passage 5, and water having a relatively high temperature in the water pipe 11 that is not affected by freezing of the working chamber 6 is allowed to enter the inflow chamber 4. Then, it flows into the working chamber 6 from above and the ice in the working chamber 6 is directly thawed. Therefore, the ice in the working chamber 6 can be thawed quickly, and the amount of water discharged from the water pipe 11 can be reduced.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the sealing of the working chamber 6 is released at the same time as the valve port 51 is opened, but the valve port 51 is opened and the valve body 7 is separated from the valve port 51 by a predetermined stroke. After that, the sealing of the working chamber 6 may be released.

  In the above embodiment, the working chamber 6 is defined between the inner cylinder portion 34 and the outer cylinder portion 35, but the outer cylinder portion 35 is omitted and the inner cylinder portion 34 and the main body 2 are interposed between them. A working chamber may be defined. In this case, a passage communicating with the inflow chamber 4 and the working chamber may be provided on the outer periphery of the main body 2 so that water from the inflow chamber 4 flows into the working chamber through the passage.

  DESCRIPTION OF SYMBOLS 1 ... Freezing prevention apparatus, 11 ... Water piping, 2 ... Main body, 4 ... Inflow chamber, 51 ... Valve port, 5 ... Drainage passage, 6 ... Actuation chamber, 7 ... Valve body, 8 ... Spring.

Claims (1)

An anti-freezing device that is attached to a water pipe and prevents the water in the water pipe from freezing,
A main body having a cylindrical main body whose upper end is connected to the water pipe, an inflow chamber communicating with the water pipe provided in the main body, and a valve port communicating with the inflow chamber at the upper end, and extending downward from the valve port A drainage passage in the inside, a cylindrical working chamber in the main body surrounding the drainage passage, a valve body capable of sealing the working chamber from above and closing the valve port from above, and the valve body on the lower closed side And a spring for biasing,
The water in the working chamber freezes and expands, and the valve element moves upward against the biasing force of the spring by the expansion pressure generated by this freezing and expansion , so that the water in the water pipe is discharged from the inlet chamber to the valve port and the drainage. In what was discharged through the passage,
When the valve body moves to the upper opening side, the valve opening is opened, the sealing of the working chamber by the valve body is released, and the water in the water pipe flows into the working chamber from above through the inflow chamber. An antifreezing device characterized by that.

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