JP2515439Y2 - Smoke tube heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a smoke tube heat exchanger for boiling hot water using kerosene or the like as fuel.

[Prior Art] FIG. 4 is a side sectional view showing a conventional smoke tube heat exchanger, and FIG. 5 is a plan view of a can body 1 thereof. The heat exchanger is mainly composed of a combustion chamber 2 having a burner 3 and a can body 1 for storing boiling water. The can body 1 is formed in a cylindrical shape, and is provided so as to cover the entire circumference and the upper side of the combustion chamber 2. The main part of this can body 1 is a combustion chamber 2.
It is installed in the upper part of.

Inside the can body 1, a plurality of smoke pipes 4 communicating with the inside of the combustion chamber 2 are vertically extended. Each smoke tube 4,4,
A baffle plate (not shown) that guides the upward flow of the combustion gas in a zigzag shape is inserted in the inside of the pipe so as to ensure a wide effective heat transfer area in the smoke tube 4. Reference numeral 5 indicates an end plate provided substantially horizontally on the upper portion of the can body 1. Reference numeral 6 indicates an upper surface portion of the combustion chamber 2.

A muffler 8 is installed on the upper side of the can body 1. The muffler 8 includes a smoke collecting chamber 8a arranged at an upper portion of the can body 1, a smoke exhaust chamber 8b protruding to the side of the can body 1, and an exhaust pipe 7 inserted into the smoke exhaust chamber 8b from above. Be equipped with.

In the conventional heat exchanger configured as described above, the water supplied from the water supply port (not shown) in the can body 1 absorbs heat energy from the peripheral wall of each smoke pipe 4, 4, ... It is designed to be taken out as hot water (not shown).

Combustion gas from the combustion chamber 2 reaches the silencer 8 via the smoke pipe 4 in the can body 1 and is discharged to the outside air via the exhaust pipe 7.

As another conventional example, Japanese Utility Model Publication No. 50-6842 discloses a hot water boiler in which the central portion of the end plate is recessed downward and the interior of the recess is a smoke exhaust chamber.

By the way, although condensed water may be generated in the muffler 8, JP-A-60-216146 describes a boiler device in which the condensed water is discharged to the outside of the boiler by a drain pipe. There is. A water-sealed portion is formed by bending the drain pipe twice in a U-shape.

[Problems to be Solved by the Invention] In the conventional example shown in FIGS. 4 and 5, since the silencer extends laterally of the can body, the smoke tube heat exchanger has a large installation space. There was a flaw.

The heat exchanger disclosed in Japanese Utility Model Publication No. 50-6842 has a small installation space and is sufficient, but it cannot discharge the condensed water in the silencer.

In the boiler device disclosed in Japanese Patent Laid-Open No. Sho 60-216146, the problem that the combustion gas in the muffler flows out through the drain pipe when the water out of the water seal (trap water) phenomenon occurs There is.

[Means for Solving the Problems] A smoke tube heat exchanger according to the present invention comprises a tubular can body having a cylinder axial direction as a vertical direction, an end plate provided on the top of the can body, and the can. A combustion chamber provided in the lower part of the body, a smoke collecting chamber provided above the end plate, the smoke collecting chamber and the combustion chamber are communicated with each other, and the upper part is fixed to the end plate and the lower part Includes a plurality of smoke pipes fixed to the upper surface of the combustion chamber, a recessed portion recessed downward from a part of the end plate, and an exhaust pipe inserted from above into the recessed portion. In the smoke tube heat exchanger, the lower part of the recessed part is a tapered part whose cross-sectional area decreases downward, and the recessed part communicates with the combustion chamber at the lower end of the first tapered part. Is provided with a drainage hole for introducing condensed water of the above into the combustion chamber. It is assumed that.

[Operation] In the smoke tube heat exchanger of the present invention, the drainage hole is provided in the lower part of the recessed portion, and the condensed water generated from the exhaust gas is discharged into the combustion chamber through the drainage hole.

[Embodiment] FIG. 1 is a longitudinal sectional view of a smoke tube heat exchanger according to an embodiment (a sectional view taken along line I-I of FIG. 3), and FIGS. 2 and 3 show a silencer. It is the top view and front view which remove and show the structure of a can.

In this embodiment, the smoke tube 4 is arranged so as to be equiradius with respect to the vertical axis of the can body 1. In the central portion of the can body 1, there is formed a concave portion 9 having a shape in which the upper end plate 5 is concave, and the inside of the concave portion 9 is a smoke exhaust chamber.
It is 8b. The exhaust pipe 7 is inserted into the smoke exhaust chamber 8b from above. The bottom of the recessed portion 9 is a taper portion whose cross-sectional area decreases downward, and the smoke exhaust chamber 8b and the combustion chamber 2 are communicated with each other by a water drain hole 10 provided at the lower end of the taper portion.

Other configurations are the same as those in FIGS. 4 and 5, and the same portions are denoted by the same reference numerals.

Combustion gas from the combustion chamber 2 rises in the smoke pipe 4 and enters the smoke collection chamber 8a, and then changes its flow direction downwards to the smoke exhaust chamber 8b.
Flows toward. The combustion gas that has passed between the outer peripheral surface of the exhaust pipe 7 and the inner peripheral surface of the recess 9 then circulates around the lower end of the exhaust pipe 7 and then rises in the exhaust pipe 7 and is released to the atmosphere.

The water generated by the condensation of the steam in the combustion gas in the smoke exhaust chamber 8b flows down along the taper portion at the bottom of the smoke exhaust chamber 8b, and from the water drain hole 10 provided at the lower end of the taper portion to the combustion chamber. It is discharged to 2. The drain hole 10 communicates only with the combustion chamber 2. Therefore, this smoke tube heat exchanger is disclosed in JP-A-60-21.
There is no possibility that the combustion gas will be discharged to the outside of the boiler from a place other than the exhaust pipe unlike the boiler device of 6146 publication.

In addition, in the smoke pipe heat exchanger of this embodiment, a plurality of smoke pipes 4 are installed penetrating the can body 1, and the heat exchange area is large. Further, the muffler 8 is installed on the upper side of the can body 1 and does not project to the side of the can body 1. Therefore, the installation space for the smoke tube heat exchanger is small and sufficient.
In addition, since the recessed portion 9 is installed so as to enter the can body 1 from above to form the smoke exhaust chamber 8b, the side wall of the smoke exhaust chamber 8b (the inner peripheral wall of the recessed portion 9) is also transmitted. It acts as a heat surface and has a large heat transfer area. Moreover, the overall height of the smoke tube heat exchanger is reduced.

In the above embodiment, the smoke tubes 4 are arranged so as to surround the concave portions 9 in one row, but if the diameter of the can body 1 is large,
As shown in the figure, a large number of smoke tubes 4 may be arranged in two rows or more.

[Advantages of the Invention] As described above, in the smoke tube heat exchanger of the present invention, the condensed water generated in the smoke collection chamber and the recess is collected by the taper portion below the recess, and the water at the lower end of the recess is collected. It is quickly discharged into the combustion chamber through the hole. Since the water drain hole communicates only with the combustion chamber, there is no possibility that the combustion exhaust gas will be discharged from the portion other than the exhaust pipe to the outside of the smoke tube heat exchanger.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment, FIG. 2 is a plan view, and FIG. 3 is a front view. FIG. 4 is a sectional view showing a conventional example, and FIG. 5 is a plan view. 1 ... Can body, 2 ... Combustion chamber, 4 ... Smoke pipe, 5 ... End plate, 6 ... Upper surface of combustion chamber, 7 ... Exhaust pipe, 8 ...
… Silencer, 8a …… Smoke collection chamber, 8b …… Smoke exhaust chamber, 9 …… Recessed part, 10 …… Drainage hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-216146 (JP, A) Actual opening 57-10234 (JP, U) Actual opening 50-6842 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A cylindrical can body having a cylinder axial direction as an up-down direction, an end plate provided at an upper part of the can body, a combustion chamber provided at a lower part of the can body, and the end plate. A smoke collecting chamber provided on the upper side of the smoke collecting chamber, the smoke collecting chamber and the combustion chamber communicating with each other, and a plurality of smoke pipes having an upper portion fixed to the end plate and a lower portion fixed to an upper surface portion of the combustion chamber. In a smoke tube heat exchanger comprising: a recessed part that is recessed downward from a part of the end plate; and an exhaust pipe that is inserted into the recessed part from above, the lower part of the recessed part is facing downward. Is a tapered portion having a small cross-sectional area, the lower end of the tapered portion communicates the recessed portion with the combustion chamber, and a drain hole for guiding condensed water in the recessed portion into the combustion chamber is provided. A smoke tube heat exchanger characterized by being provided.