JP5206039B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchange apparatus using a sheathed heater as a heat source.

Conventionally, as this type of heat exchanging device, there are one in which a plurality of plate fins arranged side by side through a sheathed heater, or one in which fins are formed integrally with a pipe of the heatsheater (
For example, see Patent Document 1 and Patent Document 2).
Japanese Utility Model Publication No. 4-68928 JP-A-6-231873

  However, among the conventional configurations, in the former heat exchange device, since the diameter of the pipe of the sheathed heater cannot be expanded as the penetration configuration of the sheathed heater with respect to the plate fin, the adhesion at the penetrating portion is inevitably poor, The heat conduction from the sieve heater to the plate fin was not good.

  In the latter case, since the fin is formed integrally with the pipe of the heatsheater, there is no problem in the heat conduction characteristic as described above, but the area of the fin cannot be increased and the heat efficiency cannot be increased. .

  The present invention solves such a conventional problem, and an object thereof is to provide a highly efficient heat exchange device.

In order to solve the above-mentioned conventional problems, the heat exchange device of the present invention has a plurality of plate fins arranged side by side made of aluminum or copper, and after being penetrated through a through hole provided in the plate fin. A heat transfer pipe formed of aluminum or copper which is expanded and held in close contact with , and a sheathed heater inserted into the heat transfer pipe; an air layer between the heat transfer pipe and the sheathed heater; A gap is provided .

With this configuration, heat transfer from the heat source unit to the plate fins is ensured, and a highly efficient heat exchange device can be provided.
In this case, in particular, a heat transfer pipe formed of aluminum or copper which is expanded and held in close contact after passing through through holes provided in a large number of parallel plate fins formed of aluminum or copper. The air layer in the gap exerts a thermal buffering effect, and the heat transfer pipe and plate fin are made of a heat conducting material such as aluminum or copper. However, they do not reach an abnormally high temperature, and the efficiency as a heat exchange device is improved. In addition, high output can be achieved and high durability can be obtained.

  According to the heat exchange device of the present invention, heat transfer from the sheathed heater to the plate fins can be ensured and high efficiency heat exchange can be realized.

Heat exchange apparatus of the present invention, a large number of plate fins arranged in parallel are formed of aluminum or copper, aluminum held close diametrically enlarged after being through the through hole provided in the plate fin or A heat transfer pipe formed of copper and a sheathed heater inserted into the heat transfer pipe are provided , and a gap serving as an air layer is provided between the heat transfer pipe and the sheathed heater .

By providing the heat transfer pipe, the heat linkage to the plate fins of the heat source part is enhanced, and many plate fins can be arranged.
In this case, in particular, a heat transfer pipe formed of aluminum or copper which is expanded and held in close contact after passing through through holes provided in a large number of parallel plate fins formed of aluminum or copper. Heating with a structure that provides an air layer between the
Even if the load to be changed fluctuates, the air layer in the gap exerts a thermal buffering effect, preventing sudden temperature fluctuations of the heat transfer pipe and plate fin, and heat such as aluminum or copper is applied to the heat transfer pipe and plate fin. Even if good materials are used, they do not reach an abnormally high temperature, and the efficiency as a heat exchange device is improved. In addition, high output can be achieved and high durability can be obtained.

The heat transfer pipe inserted into the through hole of the plate fin can increase the adhesion with the plate fin by expanding the diameter.
In addition, a space that forms an air layer is provided between the outer periphery of the end portion of the sheathed heater and the inner periphery of the end portion of the heat transfer pipe by providing a spacer that has an outwardly expanding taper portion. A gap between the sheathed heater and the heat transfer pipe that enables output can be ensured, and the heat transfer pipe and the sheathed heater can be positioned in the longitudinal direction.

  If the hole edge of the through hole in the plate fin is formed in a cylindrical shape, the heat transfer from the heat transfer pipe to the plate fin can be further improved.

In consideration of thermal expansion and corrosion, the heat transfer pipe and the spacer are made of the same material.

  If these heat exchange devices are arranged in the air flow path, a high-power, high-efficiency hot air heater can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below do not limit the present invention.

(Embodiment 1)
In the figure, a large number of plate fins 1 are arranged side by side to form one fin block 2, and a plurality of sheathed heaters 4 are inserted into the fin block 2 through heat transfer pipes 3, respectively.

  The sheathed heater 4 is configured by inserting an electric heater 6 on a center line in a pipe 5 made of iron or the like and filling an insulating material 7 such as magnesium oxide between the pipe 5 and the electric heater 6. .

  Further, the terminals 8 connected to both ends of the electric heater 6 pass through the sealing material 9 and protrude outward on both sides of the pipe 5.

  A gap 10 serving as an air layer is set between the heat transfer pipe 3 and the pipe 5 of the sheathed heater 4.

  The gap 10 is formed by joining the heat transfer pipe 3 to the outer periphery of the spacer 11 disposed at the end of the pipe 5 in the sheathed heater 4, and spreads outward at the outer end of the spacer 11. The sheathed heater 4 is positioned in the longitudinal direction by providing the taper portion 12 to the end of the heat transfer pipe 3.

  The heat transfer pipe 3 is made of a heat conducting material such as copper, and the spacer 11 is also made of the same material in consideration of thermal expansion and corrosion. The position of the spacer 11 corresponds to the outer periphery of the insertion portion of the terminal 8 where the electric heater 6 of the sheathed heater 4 does not exist in consideration of its heat resistance.

  Next, the penetration structure of the heat transfer pipe 3 with respect to the plate fin 1 will be described.

  The plate fin 1 is made of heat-conducting aluminum or the like, and a through hole 14 having a hole edge 13 formed in a cylindrical shape is formed in order to penetrate the heat transfer pipe 3.

  After passing the heat transfer pipe 3 through the through hole 14, the heat transfer pipe 3 is expanded to be in close contact with the cylindrical hole edge 13 to form a good heat transfer path.

  In the above configuration, first, the electric heater 6 of the sheathed heater 4 generates heat by energization, and the heat is transmitted to the pipe 5 through the insulating material 7 and radiated as radiant energy, and reaches the heat transfer pipe 3 through the gap 10. .

  As a result, the heat transfer pipe 3 is heated by the absorbed radiant energy and then transmitted to the plate fins 1 by conduction.

  Therefore, if the fin block 2 is arranged facing the ventilation path of the hot air heater, the air flowing through the ventilation path is heated by an action such as convection when passing through the gap between the plate fins 1, It is warmed.

  Here, the significance of providing the sheathed heater 4 in the heat transfer pipe 3 with a gap 10 serving as an air layer will be described.

  For example, in a warm air heater, a constant amount of air does not always flow through the ventilation path. That is, the load applied to the sheathed heater 4 changes every moment. That is, the load fluctuates linearly or intermittently on and off in relation to the set temperature of heating, and the output of the sheathed heater 4 needs to be controlled accordingly.

  However, it is theoretically difficult to perfectly synchronize the fluctuation of the air amount and the output control of the electric heater 6 in the sheathed heater 4. In particular, when the load suddenly fluctuates in a small direction, the temperature of the sheathed heater 4 becomes an abnormal value. It will rise to a value close to.

  Here, since the plate fin 1 is made of aluminum, which is a heat conducting material, it can be understood that a high-powered sheathed heater 4 cannot be used in consideration of its heat resistance.

  However, if the heat transfer pipe 3 is provided with the gap 10 outside the sheathed heater 4 as in the present embodiment, the air layer in the gap 10 exhibits a thermal buffering effect, and the temperature of the sheathed heater 4 is increased. It will absorb changes.

  As a result, even when a heat conducting material such as aluminum or copper is used for the heat transfer pipe 3 and the plate fin 1, they do not reach an abnormally high temperature and do not become an obstacle to heat resistance.

  From the above, the efficiency as a heat exchange device is improved, and in addition, high output can be achieved, and high durability can be obtained.

  As described above, the spacer 11 that secures the gap 10 between the sheathed heater 4 and the heat transfer pipe 3 that enables high efficiency and high output as a heat exchange device is the outer periphery of the pipe 5 of the sheathed heater 4. Although it is in contact with the surface, the position is set at a position where the electric heater 6 does not exist, so that the temperature does not become high. Therefore, even if copper or the like is used, there is no problem in temperature.

  Further, since the tapered portion 12 is formed in the spacer 11, one spacer 11 is attached to one end of the sheathed heater 4 and passed through the heat transfer pipe 3, and the tapered portion 12 is formed at the end of the heat transfer pipe 3. The other spacer 11 is then fitted to the other end of the sheathed heater 4 and moved until the tapered portion 12 contacts the other end of the heat transfer pipe 3. Are positioned.

  In the present embodiment, an example in which a gap 10 serving as an air layer is provided between the heat transfer pipe 3 and the pipe 5 of the sheathed heater 4 is shown. However, if only the heat transfer surface is observed, heat transfer is performed. The sheathed heater 4 may be inserted so that at least a part of the inner surface of the pipe 3 is in contact with the inner surface of the pipe 3. In short, the sheathed heater 4 can be inserted into the heat transfer pipe 3 substantially integrated with the plate fin 1. There is no specific limitation.

  The heat exchange device according to the present invention can realize high-efficiency heat exchange by ensuring heat transfer from the sheathed heater to the plate fin, and can be used for a heater or a dryer using hot air as a heat source. Become.

The principal part expanded sectional view of the heat exchange apparatus in Embodiment 1 of this invention. Overall perspective view of the heat exchanger Partial sectional view of the heat exchanger

DESCRIPTION OF SYMBOLS 1 Plate fin 3 Heat transfer pipe 4 Sheath heater 13 Hole edge 14 Through-hole 10 Gap

Claims (5)

A number of juxtaposed plate fins made of aluminum or copper ;
A heat transfer pipe formed of aluminum or copper which is expanded and held in close contact after being penetrated through a through hole provided in the plate fin;
A sheathed heater inserted into the heat transfer pipe ,
A heat exchange device in which a gap serving as an air layer is provided between the heat transfer pipe and the sheathed heater . The heat exchange apparatus according to claim 1, wherein a gap serving as the air layer is provided by a spacer provided with an outwardly expanding tapered portion between an outer periphery of an end of the sheathed heater and an inner periphery of an end of the heat transfer pipe. The heat exchange device according to claim 1 or 2, wherein the hole edge of the through hole in the plate fin is cylindrical. The heat exchange device according to claim 2, wherein the heat transfer pipe and the spacer are made of the same material. The hot air heater which has arrange | positioned the heat exchange apparatus of any one of Claims 1-4 in the air flow path.

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