JPH0332603Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an antifreeze device that prevents water in water supply pipes, such as water supply pipes, from freezing and damaging the pipes.

"Prior Art" Conventionally, as shown in Japanese Utility Model Application No. 58-129964, a valve seat case is connected and fixed to a water supply pipe via a branch pipe, and one end of a valve body is slidably inserted into the valve seat case. is installed protruding from the branch pipe side, and the water pressure inside the water supply pipe causes the valve body to come into contact with the inner end surface of the valve seat case so that it can freely come into contact with and separate from it, thereby preventing volumetric expansion when the water in the freezing chamber inside the valve seat case turns into ice. There is a technology that opens the valve body and releases the water inside the water pipe to the outside, thereby preventing the water inside the water pipe from freezing.

``Problems to be Solved by the Invention'' The above-mentioned conventional technology does not use a heat-sensitive medium other than water, so there is no need to adjust the temperature of an on-off valve, and water discharge loss due to uneven temperature control can be reduced.
It can be easily used in high-temperature or high-pressure water supply pipes, and provides stable opening/closing operation with almost no changes in water pressure within the water supply pipe, and uses the water pressure within the water supply pipe to provide proper valve closing action. Moreover, since the only moving part is the valve body, it has the advantage of being simple and highly durable.

However, the above-mentioned conventional technology does not form a drainage passage inside the valve body to control communication between the inside of the water supply pipe and the outside through the opening and closing operations of the valve body. Since a freezing chamber that operates to open the valve body is not formed between the inner circumferential surface of the valve seat case and the outer circumferential surface of the valve body, after ice is formed in the freezing chamber and the valve body operates to open, The valve remains open until the ice in the freezing chamber melts as the outside temperature rises, and in cold weather the valve body remains open for long periods of time, making it easy to save wastewater that flows out through the valve body. First, it is extremely uneconomical, and the valve body cannot be opened or closed in accordance with changes in water temperature in the water supply pipe, and the opening/closing function of the valve body cannot be easily improved.

``Means for Solving the Problems'' However, the present invention connects and fixes the valve seat case to the water supply pipe via a branch pipe, and inserts one end of the valve body, which is slidably inserted into the valve seat case, into the branch pipe. a drainage passage which is protruded from the water supply pipe so that the valve body is brought into contact with the inner end surface of the valve seat case so as to be able to move toward and away from the inner end surface of the valve seat case by the water pressure inside the water supply pipe, and which controls communication between the inside of the water supply pipe and the outside by opening and closing operations of the valve body; is formed inside the valve body, and a freezing chamber is formed between the inner circumferential surface of the valve seat case and the outer circumferential surface of the valve body to open the valve disk by volume expansion.

``Function'' Therefore, when the valve body opens, the water in the water supply pipe flows out from the drainage passage inside the valve body, so that when the water in the water supply pipe is used, the water is drained from the warm water buried in the soil on the upstream side. Water moves through the drainage passage, and the warm water melts the ice in the freezing chamber and closes the valve body, saving waste water flowing out through the valve body even in cold weather, making it more efficient than before. In addition to being economical to use, water from the water supply pipe moves through the valve body with the freezing chamber formed on its outer periphery, so the water temperature within the water supply pipe is almost unaffected by changes in outside temperature. The valve body can be opened and closed appropriately by following the
This makes it easier to improve the opening/closing function of the valve body compared to conventional valves.

"Embodiments" Examples of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a front explanatory view, and Fig. 2 is a side explanatory view.
Connect the branch pipe 2.

As shown in FIGS. 3 to 5, a cylindrical valve seat case 4 with heat exchange fins 3 integrally formed on the outer circumferential surface is provided, and a branch saddle portion 5 provided on the lower surface side of the branch pipe 2 The threaded portion 6 on the upper end side of the valve seat case 4 is screwed using the nut portion 7, and the valve seat case 4 with the lower end open is suspended and fixed to the branch pipe 2.

Further, a valve body 8 is provided which is slidably inserted into the valve seat case 4 from the upper end side, and a bulging head-shaped valve portion 9 at the upper end of the valve body 8 is provided to protrude into the branch pipe 2. A valve seat gasket 10 is fixed to the upper end surface of the valve seat case 4 facing the valve portion 9, and the valve portion 9 is connected to the upper end surface of the valve seat case 4 via the gasket 10 by the water pressure inside the water supply pipe 1 acting on the upper surface of the valve portion 9. It is configured so that they can come into contact with each other in a separable manner.

In addition, a drainage passage 11 is located at the center axis of the valve body 8.
The drain passage 11 is opened on the lower end side of the valve element 8, and a secondary passage 12 is formed by the inner peripheral surface of the upper end of the valve seat case 4 and the outer peripheral surface of the valve element 8 facing thereto. , the secondary side passage 12 is constantly connected to the drainage passage 11 through the small diameter and large diameter communication holes 13 and 14 provided in the valve body 8, and the inside of the water supply pipe 1 is opened and closed by the opening and closing operation of the valve body 8. It is configured to communicate with the outside via a drainage passage 11 or the like.

Furthermore, a freezing chamber 15 is formed by the inner circumferential surface of the intermediate portion of the valve seat case 4 provided with the fins 3 and the outer circumferential surface of the valve body 8 opposing thereto. , 17 are installed in the freezing chamber 1.
At the same time, the outer peripheral surface of the valve body 8 at the upper end of the freezing chamber 15 is bulged to form a stepped portion 18, and an initial freezing passage 19 is formed between the inner peripheral surface of the valve seat case 4 and the stepped portion. is forming.

In addition, an air reservoir 20 is formed above the stepped portion 18, and a water supply passage 21 is opened in the valve body 8, the lower end of which communicates with the air reservoir 20, and water is supplied through a filter 22 on the upper surface of the valve portion 9. The upper end of the water supply passage 21 is communicated with the inside of the pipe 1, and the water in the water supply pipe 1 is transferred to the freezing chamber 5 through the water supply passage 21 etc.
The water in the initial freezing passage 19 is first solidified as the outside temperature decreases, and then the water in the freezing chamber 15 is solidified, and the valve is closed by the volume expansion effect when the water in the freezing chamber 15 turns into ice. It is configured to open by pushing up the body 8.

Furthermore, a coil-shaped heat transfer accelerator 23 is provided inside the freezing chamber 5 to accelerate the solidification or thawing time of water inside the freezing chamber 15, and to retain water in the freezing chamber 15 without reducing the heat transfer area. The valve seat case 4 is provided with a drain hole 24 that reduces the amount of heat and opens the lower end side of the freezing chamber 5 to the outside, and the lid body 2 closes the drain hole 24 via a gasket 25.
6 is screwed onto the valve seat case 4, and the water in the freezing chamber 5 is drained by attaching and detaching the lid 26 to perform cleaning and operation inspection.

Further, a spring seat 27 is screwed and fixed to the lower end of the valve body 8, and an auxiliary spring 2 is used to hold the valve body 8 in a closed (downward) manner.
8 is locked to the spring seat 27.

This embodiment is constructed as described above, and includes water supply pipes such as general water supply pipes, water supply and drainage pipes for solar water heaters, boiler pipes and water heater pipes, and water tank and cooling tower pipes.
As shown in FIG. 1, the valve seat case 4 and the valve body 8 are disposed via the branch pipe 2, and as the outside temperature drops, the water in the initial freezing passage 19 first solidifies, and then the water in the freezing chamber 15 solidifies. When the water in the freezing chamber 15 solidifies, the volumetric expansion effect when the water in the freezing chamber 15 turns into ice pushes the valve body 8 upward and opens it. Furthermore, since the initial freezing passage 19 and the air reservoir 20 are provided above the freezing chamber 15, the amount of volumetric expansion of water can be more reliably obtained as the stroke of the valve body 8.

Furthermore, as the valve element 8 opens, water in the water supply pipe 1 flows into the secondary passage 12 through the gap formed between the valve part 9 and the valve seat packing 10, and at this time, the water in the water supply pipe 1 flows into the secondary passage 12 from the small diameter communication hole 13. Since air is sent to the next side passage 12, the drainage passage 11 is sent through the large diameter communication hole 14.
The water in the secondary passage 12 moves, and this water communicates within the drainage passage 11 and flows out to the outside of the lower end of the valve body 8, thereby preventing the interior of the water supply pipe 1 from freezing.

In addition, the water in the water supply pipe 1 is used, and as the warm water from the pipe buried in the soil on the upstream side moves within the water supply pipe 1, the warm water in the water supply pipe 1 is transferred to the valve body 8. When the water flows out from the central drainage passage 11, the ice in the freezing chamber 15 is melted by the heat of the warm water, and the valve body 8 is closed by the water pressure of the water supply pipe 1 and the force of the spring 28. ,
When the water temperature in the water supply pipe 1 rises, such as when water is used, the valve body 8 is closed even when the outside temperature is low, almost unaffected by changes in outside temperature, and when water is not used, the valve body 8 is closed. The valve element 8 opens when the water temperature in the water supply pipe 1 decreases and the outside temperature is low.

Furthermore, FIG. 6 shows a modification in which the heat exchange fins 3 are formed by press molding, and the fins 3 are press-fitted and fixed to the outer periphery of the valve seat case 4, and the valve seat packing 10 is placed on the valve part 9 side. It is fixed at

Furthermore, FIG. 7 shows a modified example, in which the heat exchange fins 3 are formed of an aluminum alloy coil, and the coiled fins 3 are fixed to the outer periphery of the valve seat case 4.

Furthermore, FIGS. 8 and 9 show a modification in which a pipe 29 is fitted into the large-diameter communication hole 14 of the valve body 8, and openings 30, 30 having a smaller diameter than the drainage passage 11 are inserted into the middle part of the pipe 29. The drainage passage 11 above the pipe 29 is used as an air reservoir chamber, and air is sent to the secondary passage 12 through the small diameter communication hole 13, so that when the valve body 8 is opened, the secondary passage 12 The structure is such that water from the pipe 29 flows smoothly into the drainage passage 11 through the inner hole of the pipe 29 and the opening 30.

Furthermore, FIG. 10 shows a modified example in which an air supply pipe 31 is installed and fixed inside the drainage passage 11 in a loosely fitted manner, and the upper end of the pipe 31 is opened at a position higher than the small diameter communication hole 13. 31 Air from the upper end is passed through the small diameter communication hole 13 to the secondary side passage 1.
2, and the water in the secondary passage 12 is configured to smoothly flow out from the large-diameter communication hole 14 to the drainage passage 11.

"Effect of the invention" As is clear from the above embodiments, the present invention connects and fixes the valve seat case 4 to the water supply pipe 1 via the branch pipe 2, and the valve body is slidably inserted into the valve seat case 4. 8 has one end protruding into the branch pipe 2, and the water pressure inside the water supply pipe 1 causes the valve body 8 to come into contact with the inner end surface of the valve seat case 4 so as to be able to freely come into contact with and separate from the valve seat case 4. A drainage passage 11 for communicating the inside of the water supply pipe 1 with the outside is formed inside the valve body 8, and a freezing chamber 15 for opening the valve body 8 by volume expansion is connected to the inner peripheral surface of the valve seat case 4 and the valve body 8. It is formed between the outer circumferential surface of the valve body 8, and when the valve body 8 opens, water in the water supply pipe 1 flows into the drainage passage 1 inside the valve body 8.
1, the warm water buried in the soil on the upstream side moves through the drainage passage 11 when water from the water supply pipe 1 is used, and the warm water melts the ice in the freezing chamber 15. The valve body 8 can be operated to close by using the freezing chamber 15 on the outer periphery of the valve body 8, which saves wastewater flowing out through the valve body 8 even in cold weather and can be used more economically than before.
Since the water from the water supply pipe 1 moves inside, the valve body 8 can be opened and closed appropriately by following changes in water temperature in the water supply pipe 1 without being affected by changes in outside temperature. This provides practical effects such as the ability to easily improve the opening/closing function of the valve body 8 compared to the prior art.

[Brief explanation of the drawing]

The first is an explanatory front view showing one embodiment of the present invention, the second is an explanatory side view, and the third is an A-A view of the previous figure.
Fig. 4 is a BB view, Fig. 5 is an exploded explanatory view, Figs. 6 and 7 are front explanatory views showing modified examples, and Fig. 8 is an explanatory front view showing a modified example.
The figure is a side explanatory view showing a modification, FIG. 9 is a partial explanatory view of the previous figure, and FIG. 10 is a side explanatory view showing a modification. 1... Water supply piping, 2... Branch pipe, 4... Valve seat case, 8... Valve body, 11... Drainage passage, 15...
Freezing chamber.

Claims (1)

[Scope of utility model registration request] A valve seat case is connected and fixed to the water supply pipe via a branch pipe, and one end of the valve body is slidably inserted into the valve seat case and protrudes into the branch pipe, and the valve body is activated by the water pressure inside the water supply pipe. While the valve body is brought into contact with the inner end surface of the seat case so as to be able to move toward and away from the seat case, a drainage passage is formed inside the valve body to control the communication of the inside of the water supply pipe to the outside by the opening and closing operations of the valve body, and the valve body is closed by the volume expansion action. A freezing prevention device characterized in that a freezing chamber for opening the valve body is formed between the inner circumferential surface of the valve seat case and the outer circumferential surface of the valve body.