JPH087261Y2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger, such as a water heater, which has a rational fin shape to prevent the occurrence of drainage.

(B) Conventional technology Conventionally, for preventing the occurrence of drainage in a heat exchanger such as a water heater, for example, in Japanese Utility Model Application No. 61-95985,
It has been disclosed that the generation of drain in the heat exchanger is suppressed by maintaining the temperature of the heated pipe in the heat exchanger at a certain temperature or higher.

As shown in FIG. 5, a general heat exchanger is formed by burring the plate fins 1 to form the heat transfer tube insertion port 2 and inserting the heat transfer tube 3 into the heat transfer tube insertion port 2. In particular, a ridge is provided on the fin of the heat exchanger, which is used as a distribution channel to improve the heat exchange rate.
Although there is a device described in Japanese Patent No. 884, there is no idea to prevent the generation of drain by devising a fin.

(C) Problems to be solved by the invention In the above conventional heat exchanger, the former is a so-called feedback control in which the operation of the flow rate adjusting valve is controlled by the actual heating state of the circuit to be heated, so that the predetermined control state is set. It took a certain amount of time to reach the end, and therefore it was not possible to prevent the occurrence of drainage during that time. Further, there is a problem in that it is not possible to prevent the occurrence of drainage at a water inlet or the like other than the adjustment range of the hot water temperature and the hot water discharge amount, and there is a problem that the structure is complicated and the cost is high.

Further, in the latter case, since there is a space between the adjacent plate fins 1 and the plate fins 1, the heat transfer tube 3 in which the combustion gas is cooled is formed.
Since it is in direct contact with the heat transfer tube 3, dew condensation is apt to occur on the heat transfer tube 3, and the so-called drain generation phenomenon in which the dew drops into the heat exchanger cannot be avoided. Or a gap was formed between the adjacent fins to drain the condensed water.

D. Means for Solving the Problems The present invention provides a heat exchanger that prevents the occurrence of drain in the heat exchanger with a fin having a simple structure and low manufacturing cost in view of the current state of the art. The configuration is such that a large number of plate fins 1 are arranged in parallel with each other at intervals.
In a heat exchanger in which a plurality of heat transfer tube insertion openings 2 respectively formed in each of the heat transfer tubes 3 are sequentially penetrated, a heat exchanger is provided between the substrate 4 of the plate fin 1 and the tube insertion opening 2. A tubular body 5 having a diameter slightly larger than that of the heat transfer tube insertion port 2 is formed, and a base portion 6 of each tubular body 5 of the plate fin 1 and a shoulder portion of each tubular body 5 of the adjacent plate fin 1 are formed. The closed chambers 8 formed inside the cylindrical bodies 5 by closely contacting with each other are continuously provided along the outer wall of each heat transfer tube 3.

Further, a minute gap h is provided between the base portion 6 of each tubular body 5 of the plate fins 1 and the shoulder portion 7 of each tubular body 5 of the adjacent plate fins 1 to form each tubular body. The hollow chambers 9 formed inside the heat transfer tubes 5 may be continuously provided along the outer wall of each heat transfer tube 3.

E action Each plate fin 1 that penetrates each heat transfer tube 3 in series,
The base portion 6 of the tubular body 5 and the shoulder portion 7 of each tubular body 5 of the adjacent plate fin 1 are adhered to each other to form a closed chamber 8 formed inside each tubular body 5, Since the combustion gas is continuously provided along the outer wall of the pipe, the combustion gas is blocked by the closed chamber 8 and flows through the outside of each tubular body 5, so that the combustion gas may directly come into contact with the heat transfer tube 3 cooled by the entering water. There is no. Therefore, generation of drain on the outer wall of the heat transfer tube 3 is prevented. Since the substrate 4 of the plate fin 1 and the outer periphery of the tubular body 5 are separated from the heat transfer tube 3, they are not cooled by water entering, and are directly exposed to the combustion gas to have a high temperature, which prevents drainage. To be done.

In addition, the base portion 6 of each tubular body 5 of each plate fin 1 and the shoulder portion 7 of each tubular body 5 of the adjacent plate fins 1 are brought close to each other, and a minute gap h is provided between them. Formed hollow chamber 9
Which are continuously provided along the outer wall of each heat transfer tube 3 operates with almost no change from the above example, and effectively prevents the generation of drain in the heat exchanger.

F. Embodiment An embodiment of the heat exchanger according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic explanatory view of a heat exchanger of the present invention used for a water heater. The heat exchanger H is a main burner 23 which is ignited by an igniter 20 and whose gas amount is controlled by a controller 22 via a frame rod 21. And a heat transfer tube 3 provided above the heat transfer tube 3 and heated by the combustion gas. The heat transfer tube 3 is arranged at the same position of each plate fin 1 with respect to a large number of plate fins 1, 1, ... Each of the formed plurality of heat transfer tube insertion ports 2, 2, ... Is pierced in series.

In addition, each plate fin 1 is, as shown in FIG. 2 and FIG.
A necessary number of burring processes are performed according to the number of heat transfer tubes 3 to be inserted into the substrate 4, and the burring portion is further drawn to have a tubular body 5 having a diameter slightly larger than the diameter of the heat transfer tube insertion port 2. , And the heat transfer tube insertion openings 2, 2 ,.

Then, the plate-shaped fin 1 is attached to the heat transfer tube insertion ports 2, 2,
.. are fitted onto the heat transfer tubes 3 and 3 respectively, and are continuously provided in the axial direction of the tubes, and the base portions 6 of the tubular bodies 5 of the plate fins 1
And the shoulder portions 7 of the tubular bodies 5 of the adjacent plate fins 1 are brought into close contact with each other, the sealed chambers 8 are formed inside the tubular bodies 5, respectively. Thereby, the sealed chambers 8 are continuously provided in the tube axis direction along the outer wall of each heat transfer tube 3.

In the heat exchanger H configured as described above, the closed chamber 8 formed by the cylindrical body 5 is continuously provided along the outer wall of the heat transfer tube 3 in the axial direction of the pipe, so that the combustion gas contains the closed chamber 8. There is no direct contact with the heat transfer tube 3 which is blocked by the water and flows outside the tubular body 5 and is cooled by water entering. Therefore, generation of drain on the outer wall of the heat transfer tube 3 is prevented. In addition, plate fin 1
Since the substrate 4 and the outer periphery of the tubular body 5 are separated from the heat transfer tube 3 and are not cooled by water entering, and are directly exposed to the combustion gas to reach a high temperature, drainage is prevented and corrosion is less likely to occur. , The durability of the heat exchanger is improved.

FIG. 4 shows another embodiment of the heat exchanger according to the present invention. In the embodiment shown in FIGS. 2 and 3, the base 6 of each tubular body 5 of each plate fin 1 and , Instead of closely contacting the shoulders 7 of the tubular bodies 5 of the adjacent plate fins 1, respectively,
The base portion 6 of each tubular body 5 of each plate fin 1 and the shoulder portion 7 of each tubular body 5 of the adjacent plate fins 1 are brought close to each other, and a minute gap h is provided between them to make each transmission. A hollow chamber 9 is formed on the outer wall of the heat pipe 3.

Therefore, the action and effect are almost the same as those of the embodiment shown in FIGS. 2 and 3, and the generation of drain in the heat exchanger can be effectively prevented.

As described above, in the heat exchanger according to the present invention, a tubular body is formed in the plate fin, and the base of each tubular body and the shoulder of each tubular body of the adjacent plate fins. Since the sealed chamber or the hollow chamber formed by closely contacting each of the parts with each other or by providing a minute gap between the two is continuously provided along the outer wall of each heat transfer tube,
The structure is simple and the manufacturing cost is low, and the combustion gas does not flow directly outside the cylindrical body and does not come into direct contact with the cooled heat transfer tube, which prevents drainage from occurring in the heat exchanger. In addition, the heat exchanger is less likely to corrode and the durability is increased.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an example in which the heat exchanger according to the present invention is used in a water heater, and FIG. 2 is an enlarged perspective view of an essential part in which adjacent fins of the heat exchanger are partially omitted, and FIG. Is A in FIG.
Fig. 4 is an end view of a heat exchanger according to the present invention, in which a fin is not omitted, Fig. 4 is an end view of a main part of another embodiment of the heat exchanger according to the present invention, and Fig. 5 is a fin of a conventional heat exchanger. It is an end view. 1 ... Plate fin, 2 ... Heat transfer tube insertion port, 3 ... Heat transfer tube, 4 ... Substrate, 5 ... Cylindrical body, 6 ... Base, 7 ... Shoulder, 8 ... Sealed chamber, 9 ... Hollow chamber, 20 ... Igniter, 21 ... Frame rod, 22 ... Controller, 23 ...
… Main burner, H… Heat exchanger.

Claims (2)

[Scope of utility model registration request] 1. A heat exchanger comprising a plurality of plate-shaped fins 1 arranged in parallel at a distance from each other, and a plurality of heat-transfer tube insertion openings 2 formed in each of which a heat-transfer tube 3 is passed through in series. A tubular body 5 having a diameter slightly larger than the diameter of the heat transfer tube insertion opening 2 is formed between the substrate 4 of the plate fin 1 and the tube insertion opening 2.
The base 6 of each tubular body 5 of the plate fin 1 and the shoulder portion 7 of each tubular body 5 of the adjacent plate fin 1 are brought into close contact with each other to form a closed chamber 8 formed inside each tubular body 5. Is continuously provided along the outer wall of each heat transfer tube 3 to allow the combustion gas to flow to the outside of each tubular body 5. 2. A heat exchanger comprising a plurality of plate fins 1 arranged in parallel at a distance from each other, and a plurality of heat transfer tube insertion ports 2 formed in each of which a heat transfer tube 3 is penetrated in series. A tubular body 5 having a diameter slightly larger than the diameter of the heat transfer tube insertion port 2 is formed between the substrate 4 of the plate fin 1 and the heat transfer tube insertion port 2, and each tubular body 5 of the plate fin 1 is formed. A hollow chamber 9 formed inside each tubular body 5 with a minute gap h provided between the base 6 and the shoulder 7 of each tubular body 5 of the adjacent plate fins 1,
A heat exchanger characterized in that combustion gas is circulated to the outside of each tubular body 5 by being provided continuously along the outer wall of each heat transfer tube 3.