JPS60142199A - Heat exchanger unit made of ceramic - Google Patents

Abstract

PURPOSE:To prevent leakage of heated fluid and improve heat exchanging rate per unit weight by a method wherein recesses and protrusions for engagement, which are provided on both surfaces of neighboring ceramic plates, are engaged and the tip end of a bulkhead is abutted against the recessed surface of the recess for engagement to form a plurality of heated fluid paths. CONSTITUTION:A ceramic plate 11 is provided with a plurality of recessed grooves 18 for forming a plurality of gas paths on the rectangular surface thereof from one side rim 14 to the other side rim 15 in parallel to both end faces 16, 17 and is divided by bulkheads 19. Air holes 20 penetrate through the ceramic plate 11 from one end face 16 to the other end face 17 orthogonally to said gas path forming recessed grooves 18 and is divided by bulkheads 22. The ceramic plates 11, 12, 13 may be connected air-tightly by engaging recesses 24 and protrusions 23 for engagement while a plurality of gas paths 26, having rectangular sections, are formed by abutting the tip end of the bulkheads 19 against the recessed surfaces 25 of the recesses 24 for engagement air-tightly. According to this method, the surface area per unit weight may be enlarged, the heat exchanging efficiency may be improved, air-tightness may be kept and the leakage of heated fluid may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchanger unit that heats a fluid to be heated using sensible heat possessed by a heating fluid.

[Prior art]

Hitherto, various types of heat exchangers for the above purpose have been known. One type of heat exchanger is to arrange a plurality of ceramic pipes inside the casing of the heat exchanger, and to conduct combustion gas inside the pipes. There is something that passes through. However, it is difficult to maintain airtightness when such a pipe is connected to piping outside the casing, resulting in leakage of the heated fluid. In addition, the heat exchanger of the heat exchanger tube type has a small amount of heat transferred per unit weight, and therefore the heat exchanger is heavy.

[Purpose of the invention]

The present invention aims to solve the problems of the prior art, and its purpose is to completely prevent leakage of heating fluid and to significantly improve the heat exchange rate per unit weight. Our objective is to provide a heat exchanger unit that can

[Structure of the invention]

The present invention provides a plurality of concave grooves for forming heating fluid passages extending from one side edge to the other side edge on the surface of a ceramic plate and partitioned by a plurality of parallel partition walls, and connects the back surface of the ceramic plate with the heating fluid passageway. Between the bottom surfaces of the channel-forming grooves, a plurality of heated fluid passages pass through the ceramic plate from one 61N edge to the other edge in a direction substantially perpendicular to the heating fluid channel-forming grooves, and are partitioned by a plurality of partition walls. A fluid passage hole is provided, and a fitting convex portion and a fitting concave portion are provided on the periphery of both sides of the ceramic plate, respectively, and these are fitted into the fitting concave portion and the fitting convex portion provided on both sides of the adjacent ceramic plate. The present invention also relates to a heat exchanger unit made of ceramic 7x, characterized in that a plurality of heating fluid passages are formed by abutting the tips of the partition walls against the concave surfaces of the fitting recesses.

Note that the heating fluid referred to here refers to combustion gas, etc., and the heated fluid refers to air, combustion gas, etc.

Furthermore, ceramifukus primarily refers to non-oxides such as silicon carbide and silicon nitride, as well as sialon, silicon oxynitride, and the like. However, in high-temperature heat recovery where the recovered air temperature exceeds 700℃, the steady and unsteady thermal stress is 0.5 to 2.0 kg/
The structural thermal stress due to the unbalanced flow reaches Ryu 2, and the structural thermal stress is 1 to 4.
This is because the heat transfer material must be the above-mentioned material with strong covalent bonds to withstand the heat transfer. However, if the recovered air temperature is lower than 700℃, cordierite, fused silica, mullite, alumina, spodumene, etc.
It is also possible to use oxides such as heat-resistant glass.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the accompanying drawings.

Figure 1 shows the entire thermal resistor (11 is a metal casing, and the casing has an air inlet (3) and an air outlet (3a) on both upper and lower surfaces (2), and is perpendicular to the air inlet (3) and air outlet (3a). The surface (4L (51) has a gas inlet and an outlet (61, (71).

FIG. 2 shows a ceramic heat exchanger unit QO1 according to the present invention. As shown in the figure, the unit has a rectangular parallelepiped shape, and the metal casing (1
It is installed within 1.

In addition, the unit (101 is a plurality of ceramic plates (11
), (12), and (13), and is hereinafter referred to as the ceramic plate (11).
) will be explained in detail with reference to FIGS. 3 to 9.

The ceramic plate (11) has a rectangular shape (in the illustrated embodiment, a square case is shown) and has one side it (14) on its surface.
) to the other side edge (15) on both end surfaces (16).

(17) A plurality of grooves for forming gas passages (
18), which are separated by partition walls (19) extending in the same direction. Each round 7R (18) has rounded corners to prevent cranking.

Further, (20) is a plurality of air holes having a rectangular cross section formed between the back surface of the ceramic plate (11) and the bottom surface (21) of the gas passage forming groove (18), and these air holes (20) are − side end surface (16) of the ceramic plate (11)
) toward the other end surface (17) in a direction perpendicular to the gas passage forming groove (18), and the partition wall (
22).

Furthermore, the corners of the air holes (20) are rounded to prevent cracks from forming.

Further, (23) and (24) are fitting convex portions and concave portions provided on the front and back surfaces of the ceramic plate (11), respectively, and these are connected to the adjacent ceramic plate (11) or (1
2) By fitting with the four fitting parts or convex parts of (13), the ceramic plates (11), (12), (1)
3) can be connected in an airtight manner, and the partition wall (19
) can be brought into airtight contact with the concave surface (25) of the fitting recess (24) to form a plurality of gas passages (26) with rectangular cross sections (see FIG. 2).

Note that if leakage of the heating fluid is not a serious problem, the airtight state may not be achieved in consideration of absorption of thermal stress. At this time, it is possible to simply leave a gap, or to initially apply a joint material such as an organic material that disappears when heated.

In addition, FIGS. 10 to 13 show ceramic sock plates (12
) and (13) are shown in detail, and these ceramic plates (12) and (13) have substantially the same configuration as the ceramic plate (]1), except for their respective outer parts. The difference is that the side surfaces form both side walls of the unit (101).

In the above configuration, in order to prevent leakage from the fitting portion, the peripheral portion of the unit including the fitting portion is firmly bonded using an adhesive such as a heat-resistant inorganic or organic metal polymer.

In addition, since the main heat transfer walls (27) and (2B) are thin and easily destroyed by thermal stress and structural stress, the air side partition wall (22)
The partition wall (19) on the gas side also has the role L1 of promoting heat transfer and reinforcing the structure of the unit.

Furthermore, the above-mentioned adhesive is applied between the tip of the partition wall (19) and the heat transfer wall (28) as a spacer,
It is desirable to join.

Next, the operation of the heat exchanger (1) including the heat exchanger unit 00) having the above configuration will be described.

In Figures 1 and 2, gas flows through the heat exchanger (1) through the gas inlet (6), gas flow path (26), and gas outlet (27), and the air inlet (3) ).

Air flows through the air channel (20) and the air outlet (3a). This allows the heat held by the gas to be transferred to the heat transfer wall (
19), (22), (27), and (2B) to the air.

In addition, the heat exchange area to weight ratio of the heat transfer case type large heat exchanger prototyped using ceramics is 0.02 to 0.04M.
/ kg, 0.01 to 0.02rrr for small heat exchangers
/kg, but in the case of the compact box heat exchanger according to the invention it was 0.2-0.5 rd/kg.

In addition, although the above-mentioned embodiment is an example in which the heating fluid passage and the heated fluid passage are orthogonal to each other, the angle can also be changed.

〔Effect of the invention〕

As shown by the configuration and operation described above, the present invention can achieve the following effects.

b) It is possible to expand the surface area per unit weight and significantly improve heat exchange efficiency, making it possible to improve the performance and reduce the weight of the heat exchanger.

Since the airtightness of the heated fluid can be maintained reliably, leakage of the heated fluid to the heated fluid can be completely prevented.

c) Since the unit is made up of a plurality of independent ceramic 7x plates, which are joined and assembled while adjusting the gap between the joints, thermal stress can be absorbed and breakage can be prevented.

[Brief explanation of drawings]

Figure 1 is a perspective view of a heat exchanger equipped with a heat exchanger unit according to the present invention, Figure 2 is a perspective view of the heat exchanger unit, Figure 3 is a front view of a ceramic plate, and Figure 4. 5 is the same side view, FIG. 5 is the same plan view, FIG. 6 is a sectional view taken along line 1-1 in FIG. 4, FIG. 7 is a sectional view taken along line nn in FIG. Cross-sectional view taken along line m-m, Figure 9 is Figure 3 IV
- A cross-sectional view taken along line IV, Figure 10 is a partial cross-sectional side view of another ceramic plate, Figure 11 is a cross-sectional view taken along line V-V in Figure 10, and Figure 12 is a partial cross-section of another ceramic plate. The side view and Figure 13 are cross-sectional views taken along the line Vl-Vl in Figure 12. In the figure, (1): Mekuru casing (2): Surface (3): Air inlet (3a): Air outlet (4) Two sides (5) Two sides (6): Gas inlet (7): Gas outlet aO): Unit (11): Ceramic Nox plate (12): Ceramic plate (13): Ceramic plate (14) Knee side Edge (15): Other side edge (16): End face (17)
: End face (18) : Concave groove for forming gas passage (19) : Partition wall (20) : Air hole (21) : Bottom face (22) : Partition wall (23) : Convex part for fitting (24) : Concave part for fitting (2
5) : Concave surface (26) : Gas passage patent applicant Masu Tegori (and 2 others) Agent for Kurosaki Ceramics Co., Ltd. Figure 2 II II II II II II Figure 5 Figure 4 Figure 3 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. A plurality of concave grooves for forming heating fluid passages are provided on the surface of the ceramic plate, extending from one side edge to the other side edge, and partitioned by a plurality of parallel partition walls, and forming grooves for forming heating fluid passages with the back side of the ceramic plate. A plurality of heated fluid passage holes are formed between the bottom surfaces of the heating fluid passage forming grooves, penetrating from one end edge of the ceramic plate to the other edge in a direction substantially perpendicular to the heating fluid passage forming groove, and partitioned by a plurality of partition walls. Further, a fitting convex part and a fitting concave part are provided on the periphery of both sides of the ceramic plate, and these are fitted with the fitting concave part and the fitting convex part provided on both sides of the adjacent ceramic plate, 1. A ceramic heat exchanger unit, characterized in that a plurality of heating fluid passages are formed by abutting the tip of the partition against the concave surface of the fitting recess.