JP2545204B2 - Antifreeze pipe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifreezing pipe for preventing freezing of a water supply pipe for households in cold regions.

[0002]

2. Description of the Related Art
As the anti-freezing pipe, a heat insulating pipe in which a heat insulating material and a spacer are sequentially installed inside the pipe from the outside on the outer circumference of the water supply pipe.
The one in which the (heat retaining device) is inserted is proposed in Japanese Patent Publication No. 58-2301.

However, in this structure, the air located on the outer periphery of the water supply pipe is simply enclosed in the pipe to prevent convection thereof, and the heat retaining efficiency of the water supply pipe is not necessarily good.

In addition, since this type of antifreezing pipe cannot exhibit its sufficient effect unless the lower end portion is buried to a predetermined depth, the length of the antifreezing pipe is, for example, in the Sapporo City Waterworks Construction Guidelines. Is required 1.5m or 2m.

However, in the above-mentioned structure, it is very difficult to insert a long heat insulating material into the pipe from one end side thereof without a gap as described above, and further insert a spacer into the heat insulating material. .

For this reason, as described in the above publication, the pipe and the heat insulating material must have a structure in which they are divided in the axial direction, and the number of construction steps is remarkably increased in order to join the divided pipes while sealing them. However, there was a problem that

[0007] In order to solve the above problems, Japanese Utility Model Laid-Open No. 59-151971 proposes a water supply pipe having an outer cylinder provided in the outer peripheral portion thereof via a vacuum space. In this case, the heat retaining performance of the water supply pipe is further improved as compared with the above-mentioned freeze-prevention pipe in which the air located at the outer periphery of the water supply pipe is simply contained.

However, if there is a hole in the water supply pipe,
There was a problem that water flowing from the hole into the vacuum space was stored. Therefore, it is an object of the present invention to solve the above problems and provide an antifreezing pipe that is easy to install, hygienic, and excellent in heat retention.

[0009]

In order to achieve the above object, the present invention relates to an antifreezing pipe 1 in which the periphery of a water supply pipe is protected by a heat retaining device, wherein the heat retaining device includes an inner cylinder 5 and an inner cylinder 5. The outer cylinder 6 that is exteriorly mounted on the inner cylinder 5, and the inner cylinder 5 and outer cylinder 6
A connecting member 8 that is thinner than the outer cylinder 6 and is disposed on at least one end side of the outer cylinder 6 and is connected to the inner cylinder 5 and the outer cylinder 6 by welding; and an outer cylinder end where the connecting member 8 is located. A cap 14 for covering the portion and a sealant 16 filled between the cap 14 and the connecting member 8 are provided, and a vacuum space S is formed on the outer peripheral portion of the inner cylinder 5 by the outer cylinder 6 and the connecting member 8. Formed,
The vacuum double pipe 4 is provided outside the water supply pipe 2.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of an antifreezing pipe 1 according to the present invention. The antifreezing pipe 1 is roughly composed of a water supply pipe 2 and
It is composed of a vacuum double pipe 4 and a fixing member 3.

The water supply pipe 2 is composed of, for example, a stainless pipe, an iron pipe, or a vinyl chloride pipe. The main part of the vacuum double pipe 4 is an inner cylinder 5 and an outer cylinder 6.
And the connecting member 8, the inner cylinder 5 is formed of a stainless pipe, and the outer peripheral portion is covered with copper foil, aluminum foil, chemical silver plating, or the like. Also, the outer cylinder 6
Is also made of a stainless steel pipe, a copper tip tube 7 is attached to the outer peripheral portion of the lower portion, and a getter (not shown) is provided on the inner peripheral surface of the upper portion. Further, the connecting member 8
Is made of a stainless steel material thinner than the inner cylinder 5 and the outer cylinder 6, and has a substantially U-shaped cross section in which a main body 9 of an annular plate material and the inside and outside thereof are bent downward to form an inner ring portion 10 and an outer ring portion 11. It is a ring member.

The vacuum double pipe 4 having the above structure is
For example, it is assembled as follows. First, the inner cylinder 5
The connecting member 8 is installed on the lower part of the so that its U-shaped inner surface faces downward, and both are welded all around. Next, the outer cylinder 6 is mounted on the inner cylinder 5 from above, and the upper and lower ends of the outer cylinder 6 are respectively covered by the inner cylinder 5,
The entire circumference of the connecting member 8 is welded, and the space S is formed on the outer peripheral portion of the inner cylinder 5. In order to prevent contact between the inner cylinder 5 and the outer cylinder 6 and to form a space having a predetermined width,
You may interpose a spacer suitably.

Next, a vacuum pump (not shown) is connected to the tip tube 7 provided on the outer cylinder 6, the air in the space S is drawn out to near a vacuum state, and then placed in a furnace (not shown). After further extracting air in the space S at a high temperature of about 450 ° C., the chip tube 7 is crushed to seal the space S (hereinafter referred to as “vacuum space”) S.

At this time, if the material is put into the furnace from room temperature and heated, the temperature of the outer cylinder 6 rises first, and then the temperature of the inner cylinder 5 rises later. Therefore, at the time of heating, The expansion amount of the outer cylinder 6 is large, and the connecting member 8 receives a downward force and is deformed.

On the contrary, when cooling is started, the outer cylinder 6 is cooled faster than the inner cylinder 5, so that the contraction amount of the outer cylinder 6 is large at the time of cooling, which is contrary to the above heating. The connecting member 8 receives an upward force and is deformed.

As described above, the connecting member 8 receives a force in the opposite directions during heating and cooling, but the connecting member 8 has an inner ring portion 10 and an outer ring portion 11 with respect to the main body 9. Has a right angle and has a degree of freedom with respect to vertical deformation, so that no excessive stress is applied at the time of deformation and it is not damaged. Further, the connecting member 8 includes the inner cylinder 5 and the outer cylinder 6.
Since it is thinner than that, the deformation stress is further relieved by the weakness of its own waist.

The main body 9 of the connecting member 8 does not have to be substantially perpendicular to the inner and outer ring portions 10 and 11, or the main body 9 may have a wavy shape in the radial direction. in this case,
The expansion and contraction of the main body 9 can relieve the stress.

Next, a cap 14 made of a stainless material is attached to the outside of the outer cylinder 6 and the connecting member 8, and the cap 14
The sealing agent 16 is filled between the connecting member 8 and the connecting member 8, and the chip tube 7 is covered with the upper portion of the cap 14 and another cap 15 and is appropriately sealed with a sealing agent or the like. The tip tube 7 is covered with a cap 12, and the sealant 1 is placed inside the tip tube 7.
3 may be filled.

The vacuum double pipe 4 formed as described above is mounted on the water supply pipe 2 and fixed via the fixing member 3. As the fixing member 3, rubber or the like is used, for example. Further, the fixing member 3 may be arranged around the entire circumference between the water supply pipe 2 and the vacuum double pipe 4, or may be interposed intermittently between the two so as to communicate the upper and lower sides of the vacuum double pipe 4. Alternatively, not only the upper portion of the vacuum double pipe 4, but also the lower portion and, if necessary, the intermediate portion may be interposed.

As shown in FIG. 2, the antifreezing pipe 1 having the above-described structure has an elbow 25 connected to a drain valve 22 connected to a water main 20 buried in the ground via an elbow 21. Connected to each other to form an antifreezing device A, the upper part of the antifreezing pipe 1 is guided under the floor of the building 100 to the room 101, and the upper part of the water supply pipe 2 is connected to the faucet 10 of the water supply.
2 is connected to the indoor piping 103 leading to 2. The lower end of the antifreezing pipe 1 is buried about 30 cm or more from the ground surface. If necessary, the periphery of the antifreezing pipe 1 may be covered with a heat insulating material.

In the anti-freezing device A, after using water, the faucet 103 is opened to allow water to flow, and the drain cock 23
Is rotated, the flow path of the water main 20 is blocked by the water drain valve 22, and the water on the faucet side is discharged into the ground through the water drain port 24.

However, even if this water draining operation is forgotten, the water supply pipe 2 is covered with the vacuum double pipe 4 and the vacuum space S is formed in the vacuum double pipe 4, so that the heat insulating property is excellent and Even if the temperature is below freezing, the water in the water supply pipe 2 does not freeze in a short time.

Further, as described above, the antifreezing pipe 1
The lower end of the is buried about 30 cm or more in the ground, and the temperature there is maintained at about 5 ° C regardless of the temperature of the ground surface. Therefore, this temperature of the water supply pipe 2 and the vacuum double pipe 4 is The temperature rises to keep the water supply pipe 2 warm and to prevent the freezing of tap water.

Further, when the water in the water supply pipe 2 is frozen by forgetting the water draining operation for a long time, the fixing member 3 is removed,
Alternatively, when the fixing member 3 is not arranged all around, hot water is poured from between them, or an electric current is passed between the water supply pipe 2 and the drain valve 22 to thaw the freezing inside the water supply pipe 2.

In the above embodiment, the connecting member 8 is arranged in the lower part of the vacuum double pipe 4, but the invention is not limited to this, and it may be arranged in the upper part or the upper and lower parts.
Further, in the above-mentioned embodiment, the vacuum space S is formed by the tip tube method.
However, the present invention is not limited to this, and a vacuum furnace system may be used.

[0026]

As is apparent from the above description, the antifreezing pipe according to the present invention is only required to connect both ends of the water supply pipe to the indoor piping and the drainage valve through the connecting means, respectively, and it is possible to use them on site. The construction is easy and easy.

Further, even if the water supply pipe has a hole, the water only flows into the ground and is not stored inside the vacuum double pipe, so that the problem due to the stored water does not occur.
Further, the cold air on the surface of the earth is well blocked by the vacuum double pipe, and the heat retention performance of the water supply pipe is improved as compared with the structure in which the atmosphere is simply contained.

Furthermore, since the inner cylinder and the outer cylinder are connected via the thin connecting member on at least one end side, they are put in a high temperature furnace or a vacuum furnace in the process of manufacturing the vacuum double pipe. Even when heated and cooled, the difference in relative expansion and contraction amount between the inner cylinder and the outer cylinder is absorbed by the thin connecting member, and the inner cylinder and the outer cylinder are not cracked. Therefore, the yield of products can be improved and the productivity can be improved.

Moreover, since the welds between the inner and outer cylinders and the connecting member are protected by the cap and the sealant, the welds are prevented from being damaged and corroded.

[Brief description of drawings]

FIG. 1 is a side view showing a half cutout of an antifreezing pipe.

FIG. 2 is a schematic cross-sectional view of an antifreezing device.

[Explanation of symbols]

A ... Antifreeze device, 1 ... Antifreeze pipe, 2 ... Water supply pipe,
3 ... Fixing member, 4 ... Vacuum double pipe, 5 ... Inner cylinder, 6 ... Outer cylinder, 7 ... Chip tube, 8 ... Connection member, 22 ... Drain valve, 23 ... Drain plug.

Claims (2)

(57) [Claims] 1. In an antifreezing pipe in which the periphery of a water supply pipe is protected by a heat insulation device, the heat insulation device is composed of an inner cylinder, an outer cylinder exterior to the inner cylinder, and a thinner wall than the inner cylinder and the outer cylinder. A connecting member which is disposed on at least one end side of the outer cylinder and which is welded and connected to the inner cylinder and the outer cylinder; a cap for covering an outer cylinder end portion where the connecting member is located; A sealant filled between the connecting member and
An antifreezing pipe, characterized in that a vacuum space is formed in the outer peripheral portion of the inner cylinder by the outer cylinder and a connecting member, and is constituted by a vacuum double pipe that is exteriorly mounted on the water supply pipe. 2. Between the water supply pipe and the vacuum double pipe,
The antifreezing pipe according to claim 1, wherein a fixing member for fixing these is interposed.