JPH0113037B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a combustion gas passage formed in a heat exchange device such as an oil water heater.

[Conventional technology]

Conventionally, in a heat exchange device in which the outer periphery of a combustion gas passage is configured with a heat transfer surface, a device as shown in Fig. 1 has been devised to improve the heat exchange efficiency between the combustion gas flowing in the combustion gas passage and the object to be heated. was. That is, the structure of the combustion gas passage 1 includes: a donut-shaped partition plate 3 having a diameter slightly smaller than the cross-sectional shape of the combustion gas passage 1 and having a through hole 3a drilled near the center; and a partition plate having a smaller diameter than the donut-shaped partition plate 3. By inserting into the combustion gas passage 1 a partition plate assembly 5 in which partition plates 2 and 2 are connected concentrically at appropriate adjacent pitches, the combustion gas flowing out in the radial direction from the through hole 3a of the donut-shaped partition plate 3 is removed. G is sprayed onto the heat transfer surface 6 to improve heat exchange efficiency.

[Problem that the invention seeks to solve]

However, the structure of the conventional heat exchange device has the following drawbacks.

Since two types of partition plates 2 and 3 with different shapes are required, the manufacturing cost of the partition plates is high, resulting in an expensive heat exchange device.

The combustion gas G is passed through the through hole 3 of the donut-shaped partition plate 3.
Since the structure is such that the combustion gas is diffused in the radial direction from the entire circumference of the through hole 3a, a silencer cannot be installed because the combustion gas path must be secured on the outer periphery of the through hole 3a, making it difficult to reduce the combustion gas noise. I couldn't do it.

The present invention aims to provide a heat exchange device for solving the above-mentioned drawbacks.

[Means for solving problems]

The gist of the first invention is that the outer periphery of a cylindrical combustion gas passage is constituted by a heat transfer surface, and the partition plate assembly inserted into the combustion gas passage is made of the same partition plate having a plurality of insertion holes. Heat generated by arranging a plurality of shaped partition plates in parallel at appropriate adjacent pitch intervals using descent tubes and connecting them with a plurality of communicating rods inserted into the insertion holes of each partition plate and the détente tubes. In the exchange device, the partition plate assembly is composed of a disk-shaped partition plate having an outer diameter smaller than the inner diameter of the combustion gas passage, and the insertion hole of the partition plate is arranged in a virtual regular position eccentric from the center of the partition plate. The two communicating gas paths, which are located at positions corresponding to the vertices of the rectangle and are formed between the respective outer peripheral edges of adjacent partition plates in the partition plate assembly and the heat transfer surface, extend toward the periphery of the heat transfer surface. The vertices of the virtual regular polygon are relatively shifted by an angle that is an integral multiple of the interior angle.

The gist of the second invention is that the outer periphery of a cylindrical combustion gas passage is constituted by a heat transfer surface, and the partition plate assembly inserted into the combustion gas passage is a partition plate assembly having a plurality of insertion holes. Heat generated by arranging a plurality of shaped partition plates in parallel at appropriate adjacent pitch intervals using descent tubes and connecting them with a plurality of communicating rods inserted into the insertion holes of each partition plate and the détente tubes. In the exchange device, the partition plate assembly is composed of a disk-shaped partition plate having an outer diameter smaller than the inner diameter of the combustion gas passage, and the insertion hole of the partition plate is arranged in a virtual regular position eccentric from the center of the partition plate. The two communicating gas paths, which are located at positions corresponding to the vertices of the rectangle and are formed between the respective outer peripheral edges of adjacent partition plates in the partition plate assembly and the heat transfer surface, extend toward the periphery of the heat transfer surface. The desttant tube is relatively shifted in the circumferential direction of the heat transfer surface by an angle that is an integral multiple of the interior angle of the apex of the virtual regular polygon, and the desttant tube is formed of a curved perforated plate, and the interior thereof is filled with a sound absorbing material. .

[Effect]

In the first invention, the plurality of detour chambers formed between the disc-shaped partition plates are communicated by a crescent-shaped communication gas path formed between the outer peripheral edge of the partition plate and the heat transfer surface. Therefore, the combustion gas contacts the heat transfer surface and exchanges heat while passing through the communication gas passage and the detour chamber.

In the second invention, in addition to the effect of the first invention, since the gas passage is formed on the outside of the silencer made of a distant pipe filled with a sound absorbing material, the gas passage passes through the sound absorbing material. In the meantime, noise in the combustion gases is muffled.

[Explanation of Examples]

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 2A is a partially cutaway perspective view showing an embodiment of the heat exchange device according to the first invention, and FIG. 2B is a cross-sectional view. The housing 8 has a double tube structure in which a water chamber 8c is formed between an outer circumferential wall 8b and an inner circumferential wall 8a, and has a columnar combustion chamber with a circular cross section surrounded by a heat transfer surface 7 made of the inner circumferential wall 8a. A gas passage 9 is formed. The housing 8 is not limited to the double pipe structure, but may have a structure in which a long small-diameter pipe is spirally wound to form a cylindrical combustion gas passage (not shown). Of course, it is also possible to do so, and the structure does not matter as long as the outer periphery of the cylindrical combustion gas passage is a heat transfer surface. The combustion gas passage 9 is
A partition plate assembly 10 is inserted into a large number of bypass chambers 9.
It is divided into a, 9a.... Partition plate assembly 10
is a plurality of partition plates 16, 16 in which four communication rods 13a, 13a... are inserted alternately through the detent pipe 13b and the corresponding insertion holes 16a of the partition plate 16.
... are connected in parallel at appropriate intervals of adjacent pitches P, and both ends of each communicating rod 13a are tightened. The partition plate assembly 10 is fixed by the ceiling plate 1.
This is done by, for example, connecting the tip of each communicating rod 13a to 4. Each partition plate 16 has an inner diameter D of the combustion gas passage 9.
Each vertex of an imaginary square is formed into a disk shape with a diameter of about 90 to 95% of the radius of the partition plate 16 (see Figure 2 A), and whose center (intersection of imaginary diagonals) is eccentric by a predetermined dimension from the radial center of the partition plate 16. Insertion holes 16a, 16a, . . . are bored at positions corresponding to . The partition plate assembly 10 includes an outer peripheral edge 16 of each partition plate 16.
b is in contact with or close to the heat transfer surface 7, and between the inner peripheral edge 16c of each partition plate 16 and the heat transfer surface 7,
10 to 20% of the cross-sectional area of the cylindrical combustion gas passage 9
A crescent-shaped communicating gas passage 12 is formed with an area of . Adjacent detour chambers 9a, 9a formed above and below each partition plate 16 are communicated with each other through a crescent-shaped communication gas path 12. Adjacent upper and lower partition plates 16,
16 is a state in which the positional relationship of the communicating gas passage 12 formed between the outer peripheral edge 16b of each partition plate 16 and the heat transfer surface 7 is relatively shifted by 180 degrees in the circumferential direction of the heat transfer surface 7. They are connected 13, 13, . . . so that

FIGS. 3A and 3B are cross-sectional views showing another embodiment of the first invention. The difference between the embodiment shown in FIG. 3A and the embodiment shown in FIGS. 2A and B is that the adjacent partition plates 16, 16, . . .
The points are shifted by 90 degrees along the circumferential direction, so that the combustion gas flows spirally along the heat transfer surface 7. The difference between the embodiment shown in FIG. 3B and the embodiment shown in FIGS. 2A and B is that the partition plate 16'
The position of the insertion hole 16'a bored in the partition plate 16' is set to correspond to the vertex of an imaginary equilateral triangle whose center is eccentric by a predetermined dimension from the radial center of the partition plate 16', and the position of the insertion hole 16'a bored in the partition plate 16' ... are points shifted by 120 degrees along the circumferential direction of the heat transfer surface 7.

Next, the operation of the heat exchange device according to the first invention will be explained. As shown in FIG. 2A, the combustion gas G discharged from the combustion device (not shown) rises in the combustion gas passage 9, collides with the lowest partition plate 16 of the partition plate assembly 10, and forms the first crescent. The gas flows into the communicating gas passage 12. The combustion gas G flows into the first detour chamber 9a while exchanging heat with the heat transfer surface 7 while passing through the first communicating gas path 12. Continuously, the combustion gas G flows into the second communication gas passage 12 while exchanging heat with the heat transfer surface 7 while passing through the first detour chamber 9a. Similarly, the combustion gas G that has sequentially flowed into the third, fourth, etc. detour chambers 9a, 9a, etc. is finally discharged to the outside from the chimney 17 while exchanging heat with the heat transfer surface 7.

FIGS. 4 and 5 are vertical cross-sectional partial views showing an embodiment of the second invention, and the difference from the first invention shown in FIGS. 2A and B is that an arbitrary detour chamber is provided. The point is that the muffler 18 is provided near the center of 9a'. That is,
The muffler 18 is constructed by filling a casing 18a made of a curved perforated plate used as a detent tube for the adjacent partition plates 16, 16 with a sound absorbing material 18b made of glass wool or the like, and
The gas passage 19 is disposed outside the casing 18a.

Next, the operation of the heat exchange device according to the second invention will be explained. As shown in FIG. 5, the combustion gas G discharged from the combustion device (not shown)
The gas rises within the partition plate assembly 10', collides with the lowermost partition plate 16 of the partition plate assembly 10', and flows into the first communicating gas path 12'.
The combustion gas G flows into the first detour chamber 9a' while exchanging heat with the heat transfer surface 7 while passing through the first crescent-shaped communicating gas passage 12'. Continuously, the combustion gas G exchanges heat with the heat transfer surface 7 while passing through the gas passage 19 formed outside the casing 18a of the muffler 18 in the first detour chamber 9a'.
The gas flows into the second communicating gas path 12' while being absorbed by the gas. Similarly, the third, fourth... detour chambers 9a', 9a'...
The combustion gas G that sequentially flows to the chimney 1 exchanges heat with the heat transfer surface 7 and is muffled by the silencer 18.
7 (see FIG. 2A) and is discharged to the outside.

〔Effect of the invention〕

As described in detail above, the first invention is capable of changing the positional relationship between the crescent-shaped communicating gas passages formed on the outside of each adjacent disc-shaped partition plate in the circumferential direction of the heat transfer surface to form a virtual regular polygon. Since they are relatively shifted by an appropriate angle that is an integer multiple of the interior angle of the apex, it is possible to select the direction in which the combustion gas travels in the best condition for heat transfer.
This has the excellent effect of providing a heat exchange device with low production cost of partition plates without reducing heat exchange efficiency.

In addition to the effects of the first invention, the second invention has the following advantages: In addition to the effects of the first invention, a silencer made of a distant pipe filled with a sound absorbing material is disposed in any detour chamber with a gas passage formed on the outside. The present invention has the excellent effect of providing a low-noise combustion device with a simple structure that does not impose a large passage resistance on the combustion gas passing through the gas passage.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a conventional heat exchange device, and FIGS. 2A and B show an embodiment of the heat exchange device according to the first invention, with FIG. 2A being a partially cutaway perspective view. A cutaway perspective view, Fig. 2B is a cross-sectional view, Fig. 3A,
B is a cross-sectional view showing an embodiment of another aspect of the first invention, FIG. 4 is a vertical cross-sectional partial view showing an embodiment of the heat exchange device according to the second invention, and FIG. 5 is a cross-sectional view of the same as above. It is a diagram. 7... Heat transfer surface, 9... Combustion gas passage, 10, 10'
...Partition plate assembly, 16, 16'...Partition plate, 12,
12'...Communicating gas passage, 13...Connection, 13a...Communicating rod, 13b (18a)...Distant pipe, 18
b...Sound absorbing material, 19...Gas passage.

Claims (1)

[Claims] 1. The outer periphery of a cylindrical combustion gas passage is constituted by a heat transfer surface, and the partition plate assembly inserted into the combustion gas passage is of the same shape and has a plurality of insertion holes. A heat exchange device formed by arranging a plurality of partition plates in parallel at appropriate adjacent pitch intervals using détente pipes and connecting them with a plurality of communicating rods inserted into the insertion holes of each partition plate and the détente pipes. In the above, the partition plate assembly is composed of a disk-shaped partition plate having an outer diameter smaller than the inner diameter of the combustion gas passage, and the insertion hole of the partition plate has a shape of a virtual regular polygon eccentric from the center of the partition plate. Two communicating gas paths are located at positions corresponding to the vertices and are formed between the outer peripheral edges of adjacent partition plates in the partition plate assembly and the heat transfer surface,
A heat exchange device characterized in that the heat transfer surface is relatively shifted in the circumferential direction by an angle that is an integral multiple of the interior angle of the apex of the virtual regular polygon. 2. The outer periphery of the cylindrical combustion gas passage is composed of a heat transfer surface, and the partition plate assembly inserted into the combustion gas passage has a plurality of partition plates of the same shape with a plurality of insertion holes. , in a heat exchange device formed by using detent tubes arranged in parallel at appropriate intervals of adjacent pitches and connected by a plurality of communicating rods inserted into the insertion holes of each partition plate and the detent tube, the partition plate set The body is composed of a disk-shaped partition plate having an outer diameter smaller than the inner diameter of the combustion gas passage, and the insertion hole of the partition plate is located at a position corresponding to a vertex of a virtual regular polygon eccentric from the center of the partition plate. , two communicating gas paths formed between the respective outer peripheral edges of adjacent partition plates in the partition plate assembly and the heat transfer surface,
The desttant tube is relatively shifted in the circumferential direction of the heat transfer surface by an angle that is an integral multiple of the interior angle of the apex of the virtual regular polygon, and the desttant tube is formed from a curved perforated plate, and the interior thereof is filled with a sound absorbing material. Heat exchange equipment.