JPH0564667U - Heat exchanger of water heater - Google Patents

Abstract

(57) [Summary] [Purpose] A heat exchanger for a water heater that can increase heat exchange efficiency as much as possible. [Structure] Four or more even-numbered fin fin pipes are arranged in parallel in the casing in parallel with the upper and lower stages, and thin fin plate-shaped fin plates are formed in the fin pipe in a direction orthogonal to the fin pipes at narrow intervals. In a heat exchanger of a water heater with a large number of attached fins, a burring is provided on the surface of the fin plate in the approximate center of the space surrounded by the four fin pipes arranged in a rectangular shape in the upper and lower stages. The relationship between the height h of the annular ridge and the distance H between the fin pipes is
= (0.5 to 0.7) H. With such a configuration, it is possible to suppress excessive pressure loss that causes combustion failure of the burner, while effectively increasing the thermal efficiency of the heat exchanger of the water heater.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger in a water heater that can increase the heat exchange rate as much as possible.

[0002]

[Prior Art]

 Conventionally, there has been a heat exchanger F described in Japanese Utility Model Laid-Open No. 3-93360 as one form of a heat exchanger of a water heater, and the configuration of the heat exchanger F is conceptually shown in FIGS. 6 and 7.

As shown in the figure, the heat exchanger F is attached to the water pipes 50, which are pipe-shaped water pipes 50 provided alternately at the upper and lower sides and at equal intervals, and penetrate the water pipes 50 in a direction orthogonal to the axis of the water pipes 50. It consists of many fins 51.

Further, a bar ring 52 having a diameter smaller than that of the water pipe 50 is formed in each fin 51 at a position directly above each water pipe 50 in the lower stage, and the position of the bar ring 52 is located in the water pipe 50 in each lower stage. And the upper and lower water pipes 50 adjacent to each other are set to be approximately in the middle between the upper, lower, left and right, or equidistant.

With this configuration, although not shown, when the combustion burner arranged below the heat exchanger F is burned, the exhaust gas heats the heat exchanger F. At this time, the exhaust gas spreads and heats the lower water pipe 50 and concentrates in a rice ball shape above the lower water pipe 50.

By the way, since the burring 52 is located at a location where the exhaust gas is concentrated, the burring 52 is sufficiently heated by the exhaust gas.

The heat exchange rate of the heat exchanger F, which is transferred to the upper and lower sewer pipes 50, 50 through the burring 52 and the fins 51 heated to the high temperature, can be improved.

[0008]

[Problems to be solved by the device]

 However, the above conventional heat exchanger F still has the following problems to be solved.

That is, as shown in FIG. 8, the height β of the annular ridge 52 a of the burring 52 is not considered at all with respect to the interval δ between the fins 51 provided with the burring 52 and is extremely small. It is a small value.

Therefore, even if the burring 52 is heated by the exhaust gas, it does not fully function as a baffle plate that obstructs the exhaust gas flow through the ascending flow path between the fins 51, 51. Exhaust gas can flow in the ascending flow path between the fins 51, 51 with almost no resistance, and improvement in the heat exchange rate due to the decrease in the flow rate of the exhaust gas flow could hardly be achieved.

Further, as shown in FIG. 6, since the burring 52 is installed substantially at the center of the lower water pipe 50 and the upper adjacent water pipes 50, 50, the exhaust gas is not seen in the plan view. As indicated by the mark, the flow in the ascending flow path between the fins 51, 51 flowed without resistance, and it was not possible to improve the heat exchange rate by decreasing the flow velocity of the exhaust gas flow.

An object of the present invention is to provide a heat exchanger for a water heater which can solve the above-mentioned problems.

[0013]

[Means for Solving the Problems]

 According to the present invention, fin pipes of four or more even paths are arranged in parallel in the casing according to the upper and lower stages, and thin plate fin plates are arranged on the fin pipe in a direction orthogonal to the fin pipes at narrow intervals. In a heat exchanger of a water heater with a large number of open and attached, a burring is provided on the surface of the fin plate, approximately in the center of the space surrounded by the four fin pipes arranged vertically in the upper and lower stages, The present invention relates to a heat exchanger for a water heater, wherein the relationship between the height h of the annular ridge of each burring and the distance H between the fin plates is h = (0.5 to 0.7) H.

Further, in the above configuration, when the outer diameter of the fin pipe is D in the above configuration, the axial lines of the upper fin pipes and the axial lines of the lower fin pipes are respectively 0.1 to 0.1 in the height direction. Another feature is that the axial line of the upper fin pipe and the axial line of the lower fin pipe are shifted by (0.2 to 0.3) D in the width direction in addition to being displaced by 0.2 D.

[0015]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows the overall configuration of a water heater A including a heat exchanger B according to the present invention.

As shown in the figure, basically, in the water heater A, a heat exchanger B is arranged in the upper part of the water heater casing 10, and a combustion burner structure C is arranged below the heat exchanger B. is doing.

As shown in FIG. 1, in the present embodiment, the combustion burner structure C is substantially constituted by the gas supply pipe 11, the manifold 12, the burner 13, and the combustion air supply fan 14. There is.

In addition, as shown in FIGS. 1 to 3, the heat exchanger B includes a heat exchanger casing 15 forming the outer shell thereof, and two long fin pipes 16 each, two in the upper and lower stages. , 16,17,17 are arranged in parallel, and both ends of the lower fin pipes 16,16 are connected to the corresponding ends of the adjacent upper fin pipes 17,17 through the U-shaped bent tubular portion 18. The heat exchanger casing 15 has a serpentine heat exchange passage formed therein. Further, a large number of thin rectangular plate-shaped fin plates 19 are attached to the fin pipes 16, 16, 17 and 17 in a direction orthogonal to the fin pipes along the axial direction. Further, a water supply pipe 22 and a hot water supply pipe 23 are connected to the inflow port and the outflow port which form both ends of the heat exchange flow path, respectively.

In the structure of the heat exchanger B described above, the present invention is, as is most apparent from FIG. 3, one surface of the fin plate 19 and four fins arranged vertically in the upper and lower stages. The burring 30 is provided in the substantially central portion of the rectangular space surrounded by the pipes 16, 16, 17, and 17, and the burring 30 is provided in the substantially central portion of the same shaped virtual rectangular space formed on both sides of the rectangular space. Burrings 30, 30 of the same shape are provided.

With the above configuration, the burring 30 is effectively heated by the exhaust gas, and the heat amount is transmitted to the fin pipes 16, 16, 17, 17 via the fin plate 19 to heat the water flowing in the pipe. The burring 30 functions as a baffle that effectively blocks the flow of the exhaust gas flow between the fin plates 19 and 19, and this also improves the heat exchange efficiency of the heat exchanger B. can do.

Particularly, in this embodiment, the relationship between the height h of the annular ridges 30a of the burrings 30 and the distance H between the fin pipes 19 and 19 is set to h = (0.5 to 0.7) H. There is.

That is, in FIG. 4 showing the relationship between the heat exchange efficiency of the heat exchanger B and h / H, when h / H becomes 0.5 or more, the heat exchange efficiency significantly increases. On the other hand, the relationship between the pressure loss of the heat exchanger B and h / H is shown in Fig. 5, and the pressure loss sharply rises when h / H becomes 0.7 or more.

Therefore, by setting h / H to 0.5 to 0.7, it is possible to effectively increase the heat exchange efficiency of the heat exchanger B while suppressing excessive pressure loss that causes combustion failure of the burner 13. it can.

Further, in the present embodiment, as shown in FIG. 3, when the outer diameter of the fin pipe is D, the axial lines of the upper fin pipes 17 and 17 and the axial lines of the lower fin pipes 16 and 16 are adjacent to each other. And the axial line of the upper fin pipe and the axial line of the lower fin pipe are shifted by (0.2 to 0.3) D in the width direction, respectively.

By doing so, the burring 30 and the fin pipes 16, 16, 17, 17 can cooperate with each other to further suppress the flow of the exhaust gas flow between the fin plates 19, 19. The heat efficiency of the heat exchanger B can be further improved.

The diameter d of the burring 30 is preferably approximately 0.6 of the diameter D of the fin pipes 16, 16, 17, 17 in order to maintain the effect of the baffle plate.

[0028]

【effect】

 As described above, according to the present invention, fin pipes of four or more even paths are arranged in parallel in the casing in parallel with the upper and lower stages, and the thin pipes are arranged in the fin pipe in a direction orthogonal to these fin pipes. In a heat exchanger of a water heater in which a large number of fin-shaped fin plates are installed at narrow intervals, a space surrounded by four fin pipes on the surface of the fin plate and arranged in a rectangular shape in the upper and lower stages. A burring is provided approximately at the center, and the relationship between the height h of the annular ridge of each burring and the distance H between the fin pipes is h = (0.5 to 0.7) H.

With such a configuration, it is possible to suppress excessive pressure loss that causes combustion failure of the burner, and it is possible to effectively improve the thermal efficiency of the heat exchanger of the water heater.

Further, in the above configuration, when the outer diameter of the fin pipe is D in the above configuration, the axial lines of the upper fin pipes and the axial lines of the lower fin pipes are respectively (0.1) in the height direction. .About.0.2) D, and the axis of the upper fin pipe and the axis of the lower fin pipe are offset by (0.2 to 0.3) D in the width direction.

With such a configuration, the cooperation of the burring and the fin pipe can further suppress the flow of the exhaust gas flow flowing between the fin plates, and further improve the heat efficiency of the heat exchanger.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the overall configuration of a water heater including a heat exchanger for a water heater according to the present invention.

FIG. 2 is an enlarged cross-sectional explanatory view of a main part of the heat exchanger.

FIG. 3 is a sectional view taken along line I-I of FIG.

FIG. 4 is a graph showing the relationship between the heat efficiency of heat exchanger B and h / H.

FIG. 5 is a graph showing the relationship between the pressure loss of heat exchanger B and h / H.

FIG. 6 is an explanatory view of a conventional heat exchanger for a water heater.

7 is a sectional view taken along line II-II of FIG.

FIG. 8 is an enlarged explanatory view of a main part of the heat exchanger for the water heater.

[Explanation of symbols]

 A Water heater B Heat exchanger 16 Fin pipe 17 Fin pipe 19 Fin plate 30 Burring 30a Annular ridge

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroki Maruyama 43-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Nihon Yupro Co., Ltd. (72) Yoshinori Kawasaki 43-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo No. Nihon Yupro Co., Ltd. (72) Inventor Hideya Ami 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Prefecture

Claims (2)

[Scope of utility model registration request] 1. Fin pipes (16) (17) of four or more even-numbered passes are arranged in parallel in the casing in parallel with the upper and lower stages, and the fin pipes (16) (17) are arranged in a direction orthogonal to the fin pipes (16) (17). In a heat exchanger of a water heater in which a large number of thin plate fin plates (19) are installed at narrow intervals (H), the fin plates (19) have a rectangular shape in the upper and lower stages. A burring (30) is provided in the approximate center of the space surrounded by the four fin pipes (16) (16) (17) (17) that are arranged, and the height of the annular ridge (30a) of each burring (30) is increased. Sa (h) and fin plate (19) (19)
A heat exchanger for a water heater, characterized in that the relationship with the interval (H) between them is h = (0,5 to 0.7) H. 2. When the outer diameter of the fin pipes (16) (17) is D, the axial lines of the upper fin pipes (17) (17) ... And the lower fin pipes (16) (16) The axes of ...
Each of them is (0.1-0.2) D offset in the height direction,
The axis of the upper fin pipe (17) and the lower fin pipe (1
The heat exchanger for a water heater according to claim 1, wherein the axis of (6) is displaced by (0.2 to 0.3) D in the width direction.