JP6671684B2 - One can two-water heat exchanger - Google Patents

Description

  The present invention relates to a one-can, two-water heat exchanger having both hot water supply side heating and bath side reheating.

  2. Description of the Related Art Conventionally, one-can, two-water heat exchange using one heat source and performing both hot water supply side heating and bath side reheating is known. FIG. 8 is a perspective view showing the configuration of this heat exchanger. FIG. 9 is a cross-sectional view of the one-can, two-water heat exchanger showing a state cut along a vertical plane A (a vertical plane passing through substantially the center of the heat exchanger) in FIG.

  As shown in FIG. 8 and FIG. 9, this heat exchanger has a hot water supply pipe composed of an upper water supply pipe 3U and a lower water supply pipe 3D, and a bath reheating pipe 4 housed in a single can body 2. A heat source 1 such as a gas burner is arranged below the can body 2.

  The upper-stage hot water supply pipe 3U is arranged at an upper stage of the can body 2, and the lower-stage hot water supply tube 3D is arranged at a lower stage of the can body 2. The upper hot water supply pipe 3U and the lower hot water supply pipe 3D are connected to each other to form one hot water supply pipe. The lower hot water supply pipe 3 </ b> D meanders on the lower plane of the can body 2 and rises to the upper stage of the can body 2 over the bath follower heating pipe 4. The upper water supply pipe 3U meanders on the upper plane. A hot water supply inlet 3IN is provided at an end of the lower hot water supply pipe 3D, and a hot water supply outlet 3OUT is provided at an end of the upper hot water supply pipe 3U.

  In the middle of the can 2, a bath water heating pipe 4 is disposed so as to be sandwiched between an upper hot water supply pipe 3 </ b> U and a lower hot water supply pipe 3 </ b> D. The bath reheating pipe 4 meanders on a middle plane of the can body 2. Note that a bath inlet 4IN is provided at one end of the bath post-heating pipe 4, and a bath outlet 4OUT is provided at the other end of the bath post-heating pipe 4. Further, a large number of heat transfer fins 5 are housed in the can body 2. The upper-stage hot water supply pipe 3U, the lower-stage hot water supply pipe 3D, and the bath reheating pipe 4 penetrate these heat transfer fins 5.

  By the way, when the reheating of the bath is continuously performed by the heat source 1 and the hot water supply is stopped, the lower hot water supply pipe 3D is arranged at a position closer to the heat source 1 than other pipes. It is expected that the water retained in the lower hot water supply pipe 3D, which is heated at the same time, will eventually reach the boiling temperature.

  Therefore, as shown in FIG. 9, the heat capacity of the lower hot water supply pipe 3D is increased by using thicker pipes having a larger thickness than the upper hot water supply pipe 3U and the lower hot water supply pipe 3D. The heat conduction to the accumulated water can be slowed down. Thus, it is possible to prevent a partial boiling phenomenon occurring in the pipe (particularly, in the lower hot water supply pipe 3D) and to extend the duration of the bath side reheating.

JP 2000-12260 A

  However, in the conventional heat exchanger, the lower hot water supply pipe 3D is thick, and in particular, the portion of the lower hot water supply pipe 3D in contact with the bath reheating pipe 4 and its surroundings are thick, so There is a problem that transmission of a part of the heat quantity to be transmitted to the bath reheating pipe 4 due to the reheating of the bath is delayed.

The one-can two-water heat exchanger of the present invention has been made in view of the above-described problems, and includes a can body (2), a hot water supply pipe (3D) arranged in the can body (2), A hot water supply pipe (4) disposed adjacent to the hot water supply pipe (3D) in the can body (2), wherein the hot water supply pipe (3D) has a higher heat source than the hot water supply pipe (4). It is arrange | positioned in the position close to (1), and comprises a pipe (31) and an internal structure (32) closely contacted with the inner wall of the pipe (31), and the internal structure (32) is a pipe. (31) and having an opening (KA) on the periphery of the portion in contact with the fired-out pipe chase bath (4).

Further, the one-tank two-water heat exchanger of the present invention comprises a can body (2), an upper hot water supply pipe (3U) arranged at an upper stage of the can body (2), and a lower stage of the can body (2). The lower hot water supply pipe (3D) connected to the upper hot water supply pipe (3U) and the middle of the can body (2) are disposed between the upper hot water supply pipe (3U) and the lower hot water supply pipe (3D). And a lower hot water supply pipe (3D), which is arranged at a position closer to the heat source (1) than the hot water supply pipe (4). includes an internal structure that is closely to the inner wall of the tube (31) and (32), the internal structure (32), tube (31) of the portion in contact with the fired-out pipe chase bath (4) It has an opening (KA) in the periphery.

  ADVANTAGE OF THE INVENTION According to the one-tank two-water heat exchanger of this invention, in addition to being able to prevent the boiling phenomenon of the stagnant water at the time of bath reheating by enlarging the heat capacity of a hot water supply pipe, improving the efficiency of bath reheating Can be done.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the one can two-water type heat exchanger in 1st Embodiment of this invention. FIG. 2 is a cross-sectional view of the lower hot water supply pipe in FIG. 1 (when an opening angle of an opening KA is 90 °). FIG. 2 is a cross-sectional view of the lower hot water supply pipe in FIG. 1 (when an opening angle of an opening KA is 90 °). FIG. 2 is a cross-sectional view of the lower hot water supply pipe in FIG. 1 (when an opening angle of an opening KA is 180 °). It is a perspective view of an internal structure. It is sectional drawing of a lower-stage hot-water supply pipe. It is sectional drawing which shows the one can two-water type heat exchanger in 2nd Embodiment of this invention. It is a perspective view which shows a one can two water type heat exchanger. FIG. 9 is a cross-sectional view of the conventional one-can two-water heat exchanger showing a state cut along a vertical plane A in FIG. 8.

  Hereinafter, the one-tank two-water heat exchanger according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a one-can two-water heat exchanger showing a state cut along a vertical plane A (a vertical plane passing through substantially the center of the heat exchanger) in FIG. 8.

  As shown in FIG. 1, this heat exchanger differs from the conventional one in FIG. 9 in the configuration of the lower hot water supply pipe 3D. That is, the lower-stage hot-water supply pipe 3 </ b> D includes a pipe 31 and an internal structure 32 that is in close contact with the inner wall of the pipe 31. The other configuration is the same as the conventional one shown in FIG.

Internal structure 32, the tube 31 has an opening KA formed along the longitudinal direction of the tube 31 in the peripheral portion in contact with the burning-out tube 4 chasing bath, portions of the lower supply pipe 3D Thinning has been realized. Internal structure 32 is a generally tubular, but when viewed in cross section, cut the top of the bath chase burning-out pipe 4 side-away to have a shape having an opening KA.

In this way, by providing the internal structure 32 in the lower hot water supply pipe 3D, the heat capacity of the lower hot water supply pipe 3D can be increased, and the boiling phenomenon of the stagnant water at the time of bath reheating can be prevented. Further, by forming an opening KA inside structure 32, in the peripheral portion lower hot water supply pipe 3D comes into contact with the burning-out tube 4 chasing bath, it is possible to realize a thin, lower at a bath reheating The heat transfer from the hot water supply pipe 3D to the bath reheating pipe 4 can be promoted, and the efficiency of the bath reheating can be improved.

  In this case, a thin-walled tube having the same thickness as the upper-stage hot-water supply tube 3U and the bath follow-up heating tube 4 can be used as the tube body 31. The internal structure 32 can be easily manufactured by processing a thin plate, is in close contact with the inner wall of the tube body 31, and can be brazed. This eliminates the use of thick tubes as in conventional heat exchangers, and can significantly reduce the cost of parts.

  A method of manufacturing the internal structure 32 will be described with reference to FIGS. A thin plate having elasticity is rounded like a spring pin, and inserted into the pipe 31 of the lower hot water supply pipe 3D in a form close to press-fitting. Since the inserted thin plate tends to return to its original shape by elastic deformation, the thin plate spreads along the inner wall of the tube 31, and the internal structure 32 that is in close contact with the inner wall of the tube 31 can be formed.

  As shown in FIG. 2, the thin plate is rounded so that the opening angle of the opening KA of the internal structure 32 is, for example, 90 °, and is pressed into the tube 31. The opening angle of the opening KA is defined around the center point O of the cross section of the tube 31. The opening angle of the opening KA is an angle formed by two lines connecting the cross-sectional center point O and the opposite opening ends 34 of the internal structure 32 (thin plate).

  Then, as shown in FIG. 3, the press-fitted thin plate tends to return to its original shape by springback. Then, a force is applied to the open ends 34, 34 of the thin plate in an upward, obliquely upward, and horizontal direction (in the direction of the solid arrow in FIG. 3), and the force is generated. The vicinity of the portion is pressed against the inner wall below the tubular body 31 (in the direction of the dashed arrow in FIG. 3), and the inner wall and the thin plate can be brought into close contact.

   When the opening angle of the opening KA is 180 ° or more, the force acts only in the horizontal direction even if the thin plate attempts to return to the original shape by springback as shown in FIG. Therefore, no force is exerted in the vicinity of the central part of the thin plate toward the inner wall side of the lower part of the tube 31, and it becomes difficult for the thin plate and the inner wall of the lower part of the tube 31 to be in close contact with each other.

  On the other hand, if the angle of the opening KA is less than 40 °, the thickness of the lower hot water supply pipe 3D becomes too large, and the heat conduction with the bath reheating pipe 4 may be deteriorated. Therefore, in consideration of the above two viewpoints (close contact force and heat conduction), it can be said that the opening angle of the opening KA is preferably 40 ° or more and less than 180 °. The most preferable opening angle of the opening KA is 80 ° or more and 100 ° or less.

  The shape of the opening ends 34, 34 defining the opening KA of the internal structure 32 may extend straight in the longitudinal direction, but as shown in the perspective view of FIG. May be done.

  Further, as shown in the cross-sectional view of FIG. 6, the vicinity of the open ends 34, 34 of the thin plate forming the internal structure 32 is bent at an angle inward in the circumferential direction, thereby forming an internal structure described later. As with the cut-and-raised structure and the projections 33, the turbulent flow generation effect and the cost reduction effect can be obtained. Further, a brazing material 36 can be provided between the bent portion 35 and the inner wall of the tube 31 to perform brazing. Therefore, the bent portion 34 can also serve as a mounting place where the brazing material 36 can be stably mounted.

  Next, a one-tank two-water heat exchanger according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a cross-sectional view of the one-can two-water heat exchanger showing a state cut along a vertical plane A (a vertical plane passing through substantially the center of the heat exchanger) in FIG.

  As shown in FIG. 7, this heat exchanger has cut-and-raised obstacles such as projections 33 formed on the inner wall of the internal structure 32 in comparison with the first embodiment shown in FIG. The points are different. Other configurations are the same as those of the first embodiment. The internal structure 32 can be easily processed by a sheet metal, and a complicated shape such as a cut-and-raised portion and the projection 33 can be additionally processed.

  A spring-shaped turbulence generator is inserted as a separate component inside the tube of the conventional heat exchanger so as to be inscribed in the tube. The cut-and-raised portions or protrusions 33 formed on the internal structure 32 can be expected to improve heat conduction by the same turbulence generation effect. Further, the use of the spring-shaped turbulence generating device is abolished, and the cost can be further reduced.

  In addition, in the heat exchanger of each of the above-described embodiments, the upper hot water supply pipe 3U is disposed in the upper stage of the can body 2, the bath reheating pipe 4 is disposed in the middle stage, and the lower hot water supply tube 3D is disposed in the lower stage. Although it has a stage configuration, the present invention is not limited to this, and the upper stage hot water supply pipe 3U is abolished, the bath additional heating pipe 4 is arranged in the upper stage, and the hot water supply tube (the same configuration as the lower stage hot water supply tube 3D) is arranged in the lower stage. A step configuration can be adopted, and the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Heat source 2 Can body 3D Lower hot water supply pipe 3U Upper hot water supply pipe 4 Bath follow-up heating pipe 5 Heat transfer fin 31 Tube 32 Internal structure 33 Cut or raised 34 Open end 35 Bent portion 36 Brazing material

Claims (7)

A can (2),
A hot water supply pipe (3D) arranged in the can body (2);
A bath reheating pipe (4) disposed adjacent to the hot water supply pipe (3D) in the can body (2);
The hot water supply pipe (3D) is arranged at a position closer to the heat source (1) than the hot water supply pipe (4), and has a pipe (31) and an internal structure closely attached to an inner wall of the pipe (31). and a body (32), inner structure (32), tube (31) and having an opening (KA) on the periphery of the portion in contact with the fired-out pipe chase bath (4) Single Can two-water heat exchanger.   2. The single-tank two-water heat exchanger according to claim 1, wherein the pipe body (31) has the same thickness as the bath post-heating pipe (4). 3. A can (2),
An upper water supply pipe (3U) arranged on an upper stage of the can body (2);
A lower hot water supply pipe (3D) arranged at a lower level of the can body (2) and connected to the upper hot water supply pipe (3U);
In the middle of the can body (2), a bath reheating pipe (4) disposed between the upper hot water pipe (3U) and the lower hot water pipe (3D) is provided.
The lower-stage hot water supply pipe (3D) is arranged at a position closer to the heat source (1) than the post-bath heating pipe (4), and has a pipe body (31) and an interior closely connected to an inner wall of the pipe body (31). structure (32), provided with an internal structure (32), a feature that has an opening (KA) in the peripheral portion tube (31) is in contact with the bath chase burning-out tube (4) One can two-water heat exchanger.   The one-tank two-water heat exchanger according to claim 3, wherein the pipe (31) has the same wall thickness as the upper hot water supply pipe (3U) and the bath follow-up heating pipe (4). .   The opening angle of the opening (KA) is 40 ° or more and less than 180 ° around a center point (O) of the cross section of the tube (31). A one-can two-water heat exchanger according to Crab.   The can (2) according to any one of claims 1 to 5, wherein the vicinity of the open end (34, 34) of the internal structure (32) is bent inward at an angle. Water heat exchanger.   The one-can two-water heat exchanger according to any one of claims 1 to 6, wherein a cut-out or protrusion (33) is formed on an inner wall of the internal structure (32).

Images