JP2001116475A - Heating radiator and method for manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating radiator which can change its peripheral facilities, such as the boiler, pipeline, etc., to simple ones, is not corroded, can be handled and designed easily by constituting the radiator of resin tubes instead of the metallic tubes constituting the conventional radiator and a method by which the radiator can be manufactured inexpensively. SOLUTION: A heating radiator is provided with small-diameter tubes 1 and 2 which are closely arranged in parallel with each other with convective spaces in between in one direction, supporting members 3 and 4 which maintain the spaces, etc. The group of tubes 1 and 2 form passages for hot water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator for heating using hot water.

[0002]

2. Description of the Related Art Conventionally, copper tubes and iron have been used for radiators for heating. FIG. 6 is a side view showing a model using a copper tube. Reference numeral 13 denotes a copper tube and aluminum fins 14
Are attached closely. Fig. 7 (A) for iron
2 shows a cross-sectional view, and FIG. In this case, a passage 16 for the heat medium is formed by press molding instead of a tube, and coarse fins 15 made of iron are attached. Or fin 15
Although there is a flat plate without this, of course, this type sacrifices the heat radiation to some extent.

As shown in FIG. 8, there is a type in which a tube 17 or a tube is simply arranged. 18 is a header. All of them are made of metal and heavy, and the installation work must be done by a specialist. In addition, most of the products actually distributed in the market are made of iron, and there is always concern about corrosion. Since it is made of iron, it is corroded by oxygen in warm water. For this reason, metal pipes are used for piping, and the use of resin pipes that transmit oxygen is prohibited in principle.

[0004] When a resin tube is unavoidably used, a multi-layered, expensive oxygen impervious material is used. In addition, a hot water boiler is required to have a hermetically sealed type in order to prevent mixing of oxygen. Since it is a closed type, it becomes a pressure vessel and requires an expansion tank. The use of a simple open boiler with an iron radiator will significantly reduce the life of the radiator.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heating radiator which does not corrode, is light and easy to install, and has good heat radiation characteristics at a low cost. This allows the open boiler to be used, freed from oxygen problems, and normal resin tubing can be used.

[0006]

[Means to solve the problem] To solve the above problems,
In the present invention, the radiator itself is formed of a resin tube. The thermal conductivity of the resin tube is very small compared to that of metal. For example, when comparing the thermal conductivity with resin pipe, copper is 2193 times and iron is 2
It is 78 times. For this reason, it was impossible to think of a radiator using a resin tube. However, the difference in the material of the heat conduction to the air disappears due to the air film coefficient.
For example, the amount of heat Q that the tube radiates into the air by heat conduction is represented by the following equation.

Q = kπΔt (Δt: temperature difference between heating medium and room) Here, k is given by the following equation. 1 / k = (1 / h ₁ d ₁ ) + ｛(1 / 2λ) Lnd ₂
/ D ₁ ｝ + (1 / h ₂ d ₂ ) where h ₁ is about 3500 in the heat transfer coefficient inside the pipe, that is, water. , D ₁ is the inside diameter of the tube, h ₂ is 10 back and forth in the heat transfer coefficient of the abluminal clogging air (air boundary film coefficient). d ₂ is the outer diameter of the tube, lambda is the thermal conductivity due to the tube material. Thus, the k value of the copper pipe and the resin pipe will be compared. For example, 1
Calculating for 0 A (inner diameter 10 mm, outer diameter 13 mm), k = 0.129 for a copper tube and 0.115 for a resin tube. In comparison of the thermal conductivity of only the material, copper is 2193 times that of the resin tube, but when heat is transferred to the air, it is only 1.12 times.

When calculated from this k value, the amount of heat radiation Q due to convection of the resin pipe is 21.5 W / h per meter. There is also radiant heat transfer, which is about 11 W / h per meter, for a total of 32.5 W / h. Since the heat radiation amount per 1 m of the resin pipe is determined, the setting of the necessary heat radiation amount only needs to determine the length of the resin pipe. However, a space for convection is required between the pipes, and when the pipes are multiplexed, the radiation in the shaded area is reduced accordingly. This is the same in the case of a metal tube. Even if a large number of radiating fins are attached, a space that allows convection is required, and in the case of the radiating fin 14, radiant heat cannot be expected.

When the distance between the radiation fins is reduced, a forced convection fan is required. Since the resin tube has a low thermal conductivity, even if a heat radiating plate is attached like a metal tube, there is almost no effect. In other words, for indoor heating, it is useless to try to take out heat by bringing some solids into contact with the resin pipe. Examples of such solid contact include floor heating and road heating. In this case, the amount of heat radiation is small and the temperature is about 5 to 30 ° C. The pitch of the resin tube arrangement is also coarse, which is sufficient for these applications.

[0010] However, in order to warm the indoor air, a higher density heat radiation is required. Therefore, it is most effective to make the resin tube independent and bring it into direct contact with air. However, since the heat radiation amount is insufficient with one tube, the number of tubes is increased. An example of the actual piping configuration is shown in FIG.
As shown in (B) and (C), as many pieces as possible are densely packed while maintaining the intervals. For example, the case of FIG. 1A can be realized by inserting the resin tube 1 into a perforated plate 3 as shown in FIG. FIG. 2B is a partial perspective view of the configuration. In this case, the interval and the arrangement can be arbitrarily selected.
FIG. 1 (C) shows an aggregate of several straight pipes fused together, which is another method for keeping a space.

With such a structure in which the tubes are densely packed in a state in which convection is likely to occur, a similar amount of heat can be obtained from a metal tube. The joining of the tubes is not impossible if the U-bend as shown in FIG. 9 is brazed. However, the small-diameter metal tube is much more efficient and economical if the fins 14 are attached as described above, so that it is not necessary to have a troublesome structure. In the case of the structure shown in FIG. 8, the diameter of the tube is increased and no fin is provided. The most problematic in the case where the resin pipes are densely arranged is the joining method of the pipe ends.

The most common method is to heat seal a tube as shown in FIG. 9 and a U-bend 19 made of the same resin. Although it is a so-called heat fusion method, it is extremely difficult when the pipes are dense as shown in FIG. 1, and especially in the case of FIG. 1C, it is impossible to use any conventional connection method. Even if it is possible, in this case, one passage is inevitably formed as shown in FIG. 5A, and there are many bends and the pressure loss of the hot water becomes very large. The joining of such dense tubes is therefore effected by the method according to the tube end treatment which has been filed by the inventor of the present invention as application number 11-199384.

FIG. 4A is a perspective view thereof, and FIG. 4B is a sectional model view thereof. A resin plate 5 is fused to the tip of the aggregate of the tubes 1, and two or more open ends 6 of the tube 1 are welded and the socket 7 is thermally fused to form a plurality of hot water passages in this group of tubes. 8, 9 can be formed. According to this pipe end processing method, it is also possible to use a header method in which all the pipe groups flow in the same direction as shown in FIG. 5B. However, in the case of the present invention having a large number of pipes, a pipe having a fast flow rate and a pipe having a slow flow rate are used. Drift occurs. Therefore, by providing the plurality of passages 8 and 9 as shown in FIG. 5C, the pressure loss can be reduced and the drift can be further prevented. Any number of passages can be set as needed by changing the shape of the socket.

The above method is a dense method in the case where the resin pipes are straight pipes. The resin pipes are alternately passed through the support rods 4 as shown in the sectional view of FIG. It can also be crowded. FIG. 2D is a partial perspective view of the configuration. Further, when the resin tube 2 molded and fixed in a wavy shape is thermally fused with its convex portion, the resin tube 2 can be formed into a net shape only with the resin tube as shown in FIG. When this corrugated tube is rotated by 90 ° and fused, a structure having only a resin tube having a cross section as shown in FIG. 3B is also possible.

This is a method that makes full use of the flexibility of the resin tube. Even in this method, a predetermined space is maintained and the heat radiation characteristics are not hindered. In other words, the present invention has support means (3, 4) in which small-diameter pipes (1, 2) made of a thermoplastic resin are arranged in a parallel direction and are densely packed with a space capable of convection, and the space is maintained. Is a heating radiator whose tube group forms a hot water passage. The small-diameter pipe here means a pipe diameter that can be supplied by winding a resin pipe in a coil shape.

When the tube is placed in the air, the larger the diameter of the tube, the greater the amount of heat radiation. FIG. 8 is an example of a metal tube radiator, but the same configuration can be easily applied to a resin tube. However, if the diameter of the pipe is large, the amount of water held by the pipe itself increases, and the advantage of lightness is canceled. In order to prevent this, as shown in FIG. 5 (D), both ends of a resin tube 11 having an outer diameter smaller than the inner diameter of the tube 10 are sealed in a hollow to form a hollow tube and the tube 1 is formed.
Insert at 0. The gap 12 formed in the pipe 10 becomes a hot water passage. This allows a radiator with a small amount of water to be retained even with a thick tube. In this example, where the tubes are thick and independent from one another, conventional joining methods are sufficient.

[0017]

[Function] This is a radiator using a resin tube, which has never been considered before. It is easy to manufacture because it is a resin tube,
Since the amount of heat radiation per meter of pipe can be estimated, a radiator of a necessary amount of heat can be designed without any effort. It is extremely lightweight and can cope with variations in size at low cost.

[0018]

Embodiment 1 Nominal diameter 10 A (inner diameter 10 mm, outer diameter 13 m
m) is cut into a 1200 mm long
The support plate as shown in (A) is made of wood and the distance between the pipes is 7
mm and 16 rows x 2 rows. The spacing between the support plates was 200 mm, the periphery was also made of a wood frame, and the pipe ends were processed into a header having four passages. Overall size is 3
It was 60 mm x 1300 mm x 40 mm. The amount of heat radiation at this time was 921 W / h at the temperature difference Δt = 60 ° C.

[0019]

EXAMPLE 2 As shown in FIG. 2D, 24 10A polybutene tubes (1300 mm length) are alternately passed through seven wood support rods (length 320 mm) fixed at an interval of 200 mm and finished in a net shape. Was. The pipe end was processed into a header in which two pipes formed one passage. The total size including the frame is 350m
m × 1300 mm × 350 mm, and the heat radiation amount at this time was 780 W / h at a temperature difference of 60 ° C.

[0020]

Example 3 20A of 1.6 m length (outer diameter 27 m) made of polypropylene random copolymer (PPR)
m, 22 mm in inner diameter) was inserted into a 13 A (outer diameter: 17 mm, inner diameter: 13 mm) having the same length and a length of 1.5 m and sealed at both ends. Nine pieces were connected by a header method at a pitch of 45 mm. The amount of water retained is 5.5k before the pipe is inserted.
g, but weighed 2.4 kg after insertion.

[0021]

The concept of the radiator is greatly changed by using the resin tube. That is, there is no concern about corrosion. A closed boiler serving as a pressure vessel is not required, and an open boiler that is easy to handle is sufficient. There is no problem with the durability of the resin pipe, but it has a longer life than the boiler. The installation is not a specialty, but it is easy for the dealer to install, and the cost can be further reduced, so the overall effect is enormous.

[Brief description of the drawings]

FIG. 1 shows an example of a method for arranging resin tubes.

FIG. 2 is a perspective view showing an embodiment of the present invention.

FIG. 3 is an explanatory view showing an embodiment.

FIG. 4 is a cross-sectional model diagram for explanation by a pipe joining method.

FIG. 5 is an explanatory view of a fluid passage.

FIG. 6 is a side view of a conventional example.

FIG. 7 is a cross-sectional and side view model of a conventional example.

FIG. 8 is a side view of a conventional example.

FIG. 9 is an explanatory view of a joining method.

[Explanation of symbols]

 1 pipe 2 corrugated pipe 3 Support plate 4 Support rod 5 Fusing plate 6 Open end 7 Socket 8, 9 Fluid passage 10 Tube 11 Enclosure tube 12 Gap

Claims (4)

[Claims] 1. A small-diameter pipe (1, 2) made of a thermoplastic resin.
Are arranged closely in a parallel direction and have a space capable of convection, and have support means (3, 4) for maintaining the space.
A radiator for heating whose tube group forms a hot water passage. 2. A heating apparatus according to claim 1, wherein the small-diameter pipe (2) made of a thermoplastic resin is formed into a wavy shape, and these are heat-sealed to each other to form a net-like structure by the pipe itself. Radiator 3. A heating radiator in which a double resin tube is formed by incorporating a resin tube whose both ends are sealed, and a plurality of the resin tubes are arranged in parallel at intervals to form a hot water passage. 4. A small-diameter pipe made of a thermoplastic resin.
Are densely arranged in a parallel direction via support means (3, 4) for maintaining a space capable of convection, and the tube groups are joined to form a plurality of passages (8,
Method for manufacturing a radiator for heating in which 9) is folded back to form a hot water passage