JP3727021B2 - Crevice seal structure of heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a gap seal structure of a heat exchange device, and in particular, can prevent combustion gas from flowing outside by bypassing a stacked heat exchanger and improve the heat exchange efficiency of the heat exchange device. About.
[0002]
[Prior art]
  Conventionally, various types of heat exchange devices that are provided in various combustion devices such as water heaters and heat fluid such as hot water using high-temperature combustion gas generated in a burner have been used. Some have a stacked heat exchanger having a structure in which a plurality of flow path forming plates having flow paths inside are stacked. This stacked heat exchanger can be configured compactly while securing a necessary heat transfer area, and the heat exchange device can be downsized.
[0003]
  In this heat exchange device, the combustion gas introduced into the case member that houses the stacked heat exchanger passes between the flow path forming plates while heating the fluid flowing through the flow paths of the plurality of flow path forming plates. Then, it is discharged from the combustion gas discharge port of the case member to the outside of the heat exchange device.
  Here, in the production of the heat exchange device, it is inevitable that a gap is formed between the case member and the laminated heat exchanger, but the combustion gas bypasses the heat exchanger from this gap to the combustion gas discharge port. When flowing, a part of the combustion gas is discharged outside without exchanging heat with the fluid, so that the heat exchange efficiency is considerably lowered.
[0004]
  For this reason, it is necessary to close this gap by some means. However, as described above, the stacked heat exchanger has a structure in which a plurality of flow path forming plates are stacked. A plurality of grooves are inevitably formed on the outer periphery of the mold heat exchanger. However, the conventional laminated heat exchanger is not configured to block up to such a groove, and a part of the combustion gas is discharged from the groove to the outside by bypassing the laminated heat exchanger. There was a problem that the heat exchange efficiency was lowered.
[0005]
  As a countermeasure against this, it is easily conceivable to first close the groove with a synthetic resin sealing member. In addition, a closing plate that closes the gap between the case member and the heat exchange device is provided, and the plurality of grooves are also airtightly closed. A comb-tooth shaped portion having a plurality of projecting pieces is provided on the top, and the plurality of projecting pieces of the comb-tooth shaped portion project into the plurality of grooves so as to prevent combustion gas from flowing out from the groove to the combustion gas discharge port. It is also conceivable that the plurality of grooves are closed.
[0006]
[Problems to be solved by the invention]
  However, when the heat exchanger is a latent heat recovery type heat exchanger capable of recovering the latent heat of the water vapor in the combustion gas when the sealing member is configured to close the groove portion, Condensates to produce water, and this condensed water contains nitrogen oxides and sulfur oxides in the combustion gas, and thus shows acidity. For this reason, the sealing member that closes the groove portion must be made of a highly corrosion-resistant material, which is disadvantageous in terms of manufacturing cost.
[0007]
  Further, when the groove portion is configured to be closed by the comb-shaped portion of the closing plate, the width of the plurality of groove portions is not necessarily constant due to factors such as manufacturing errors, and a plurality of protruding pieces that protrude into the plurality of groove portions, respectively. If the width is formed to be approximately the same as the width of the groove, if the width of the plurality of grooves varies, the protruding piece cannot be protruded into the groove to close the groove. Must be formed narrower than the width of the groove.
[0008]
  However, in this case, the amount of combustion gas flowing out of the groove can be reduced by the protruding piece compared to the case where the groove is not blocked at all, but the combustion gas is stacked from the gap between the protruding piece and the groove. Therefore, it is impossible to completely prevent the gas from flowing into the combustion gas discharge port, thereby reducing the heat exchange efficiency.
  The object of the present invention is to close the groove formed in the outer peripheral portion of the laminated heat exchanger in an almost airtight manner to prevent combustion gas from being discharged by bypassing the laminated heat exchanger, thereby heat exchange Improving efficiency, etc.
[0009]
[Means for Solving the Problems]
  The gap seal structure of the heat exchange device according to claim 1 is a laminated structure in which a case member having a combustion gas introduction port and a combustion gas discharge port, and a plurality of flow path forming plates are laminated inside the case member. In the heat exchange device comprising a mold heat exchanger, a closing plate that closes a gap between the case member and the stacked heat exchanger is provided, and the outer periphery of the stacked heat exchanger is provided on the stacked heat exchanger side of the closed plate Provided with a comb-shaped portion formed in a plurality of protruding pieces protruding into a plurality of groove portions of the portion in a comb-tooth shape,The blocking plate includes a plurality of slits positioned between the plurality of protruding pieces of the comb-shaped portion, and a plurality of bent portions formed in parallel with the slits at positions on the extension of the plurality of slits. And a plurality of bent portions bent to the opposite sideIt is characterized by this.
[0010]
  The combustion gas introduced into the case member from the combustion gas inlet port is heated while exchanging heat with the fluid flowing through the flow passages formed in the flow passage forming plates. And is discharged to the outside of the heat exchange device from the combustion gas discharge port.
  Here, in the production of the heat exchange device, it is inevitable that a gap is generated between the case member and the laminated heat exchanger, but a part of the combustion gas bypasses the laminated heat exchanger from this gap. In order to prevent the fuel gas from flowing to the combustion gas discharge port, a closing plate is provided to close the space between the case member and the stacked heat exchanger.
[0011]
  Here, a plurality of grooves are formed in the outer peripheral portion of the stacked heat exchanger by a plurality of stacked flow path forming plates, and a part of the combustion gas bypasses the stacked heat exchanger from the plurality of grooves. In the end portion of the closing plate on the side of the laminated heat exchanger, a comb-shaped portion in which protruding pieces protruding into the plurality of grooves are formed in a substantially comb-tooth shape is provided. Therefore, the plurality of groove portions can be closed by these protruding pieces, and the space between the case member and the laminated heat exchanger can be closed almost in an airtight manner. Accordingly, it is possible to improve the heat exchange efficiency by suppressing the combustion gas from bypassing the stacked heat exchanger and flowing to the combustion gas discharge port.
  In addition, the blocking plate includes a plurality of slits positioned between the plurality of protruding pieces of the comb-shaped portion, and a plurality of bent portions formed in parallel with the slits at positions on the extension of the plurality of slits. Since the plurality of bent portions are alternately bent to the opposite side, the protruding pieces can be inclined with respect to the stacking direction of the flow path forming plates by the bent portions formed in parallel with the slits. That is, the protruding piece is formed so that the width in the stacking direction of the protruding piece is slightly wider than the width of the groove in the state where the comb-shaped portion is extended in the stacking direction, and the protruding portion is bent at the bent portion. Is inclined with respect to the stacking direction, the projecting piece having a width wider than the groove can be projected into the groove so that the groove can be almost completely closed.
[0012]
  The gap seal structure of the heat exchange device according to claim 2 is a laminated structure in which a case member having a combustion gas introduction port and a combustion gas discharge port, and a plurality of flow path forming plates are laminated inside the case member. In a heat exchange device comprising a mold heat exchanger, a plurality of closing plates are provided to block between the case member and the stacked heat exchanger, and the stacked heat exchange is provided on the stacked heat exchanger side of the plurality of closing plates. A comb-tooth-shaped portion is provided in which a plurality of protruding pieces protruding into a plurality of grooves on the outer peripheral portion of the vessel are formed in a comb-tooth shape.
[0013]
  Similarly to the invention of claim 1, the seal structure of this heat exchange device is also formed by closing the groove with a comb-shaped portion in which a plurality of protruding pieces protruding into the plurality of grooves are formed in a substantially comb-like shape, It is comprised so that between a case member and a lamination type heat exchanger may be plugged up. Here, because the width of the plurality of groove portions is not necessarily constant due to factors such as manufacturing errors, the groove portions can be blocked by projecting the plurality of protruding pieces into the plurality of groove portions even if the width of the groove portions varies. In addition, the width of the protruding piece needs to be narrower than the width of the groove. However, a gap is formed between the groove and the projecting piece only by the comb-shaped portion of the single closing plate, so that a part of the combustion gas bypasses the stacked heat exchanger from the gap and burns the combustion gas. It will flow to the outlet.
[0014]
  Therefore, if a plurality of such blocking plates are provided, and a plurality of blocking plates are arranged so that the comb-shaped portions of the plurality of blocking plates are displaced in the stacking direction of the flow path forming plates, any comb-shaped portion Even if there is a gap between the protruding piece and the groove portion, the gap can be closed by the protruding piece of another comb-shaped portion, so that the combustion gas bypasses the stacked heat exchanger from the groove portion and burns the combustion gas. The flow to the discharge port can be almost completely prevented.
[0015]
  The gap seal structure of the heat exchange device according to claim 3 is the invention according to claim 2, wherein the plurality of closing plates areIt consists of two closing plates, and in each groove, the protruding piece of the comb-shaped portion of one closing plate and the other The protruding piece of the comb-shaped part of the closing plateAt least partially in close contact, andOf the two obstruction platesThe two comb-tooth shaped portions are arranged so as to be located at positions shifted in the stacking direction of the flow path forming plate. Since it is necessary to make the width of the protruding piece narrower than the width of the groove portion, there is a gap between the protruding piece of one certain comb-shaped portion and the groove portion,Of the two obstruction platesSince the two comb-shaped portions are displaced in the stacking direction of the flow path forming plate, the gaps can be blocked by the protruding pieces of the other comb-shaped portions disposed so as to be displaced from the comb-shaped portions. it can.
[0016]
[0017]
  Claim4In the invention according to claim 2 or 3, at least one of the plurality of closing plates is formed of a thin metal plate that can be elastically deformed when the gas pressure of the combustion gas rises. It is characterized by this. As described above, it is possible to improve the heat exchange efficiency by closing the space between the case member and the laminated heat exchanger in a substantially airtight manner, but on the other hand, the airtightness between the case member and the laminated heat exchanger is always kept airtight. If the burner output fluctuates, the burner flame becomes unstable due to amplification of fluctuations in the pressure of the combustion gas in the case member in an unsteady state of the combustion equipment, such as when the output of the burner fluctuates. In addition, there is a possibility that a phenomenon called so-called vibration combustion occurs in which the device itself provided with the heat exchange device vibrates in resonance.
[0018]
  Therefore, by configuring at least one of the plurality of blocking plates with a thin metal plate, when the gas pressure increases in an unsteady state, the blocking plate configured with the thin metal plate by the increased gas pressure. Is elastically deformed, and the comb-shaped portion is separated from the groove portion. Accordingly, a part of the combustion gas temporarily flows from the groove portion to the combustion gas discharge port bypassing the stacked heat exchanger, and the increased gas pressure is reduced, so that the gas pressure is prevented from greatly fluctuating. Thus, occurrence of vibration combustion can be prevented. If the gas pressure is reduced, the closing plate returns to its original state and the groove portion is closed by the comb-shaped portion, and combustion gas does not leak from the groove portion continuously after the gas pressure is reduced.
[0019]
  Claim5The gap seal structure of the heat exchange apparatus of the present invention is a stacked heat exchange structure in which a case member having a combustion gas inlet and a combustion gas outlet is disposed, and a plurality of flow path forming plates are stacked inside the case member In order to prevent the combustion gas from bypassing the stacked heat exchanger and flowing to the combustion gas discharge port, a blocking plate that closes the space between the case member and the stacked heat exchanger is provided. A coil spring that is extendable in the laminating direction of the flow path forming plate, and is provided with a coil spring that closes a plurality of grooves on the outer peripheral portion of the laminated heat exchanger in a substantially airtight manner, The tip of the exchanger is in contact with the coil spring.
[0020]
  Instead of providing the comb-shaped portion on the closing plate as in the first aspect of the invention, a plurality of coil springs are provided to close the plurality of grooves in a substantially airtight manner between the case member and the laminated heat exchanger. By bringing the leading end of the closing plate on the side of the laminated heat exchanger into contact with the coil spring, the gap between the case member and the laminated heat exchanger can be closed in an almost airtight manner. Other functions are the same as those of the first aspect, and the description thereof is omitted.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described. This embodiment is an example in which the present invention is applied to a latent heat recovery type heat exchange device (secondary heat exchange device) of a water heater.
  First, the water heater 1 will be briefly described.
  As shown in FIG. 1, the water heater 1 can also recover a burner 2, a primary heat exchange device 3 that recovers sensible heat of the combustion gas from the burner 2, and the latent heat of water vapor in the combustion gas 2. A secondary heat exchange device 4 and a blower fan 5 for supplying combustion air to the burner 2 are provided. A gas supply pipe 10 for supplying fuel gas is connected to the burner 2.
[0022]
  As shown in FIGS. 1 and 2, the water supply pipe 11 is connected to the water supply port 32 of the secondary heat exchange device 4, while the primary heat exchange device 3 and the secondary heat exchange device 4 are connected to the hot water outlet 33. A connecting pipe 12 is connected. The water supplied from the water supply pipe 11 to the secondary heat exchange device 4 is heat-exchanged and heated with the low-temperature combustion gas flowing from the primary heat exchange device 3 by the secondary heat exchange device 4, and the connection pipe 12. To the primary heat exchange device 3. The hot water that has flowed into the primary heat exchange device 3 is further heat-exchanged with the high-temperature combustion gas from the burner 2 and heated, and hot water is supplied from the tap pipe 13 to various facilities such as a kitchen and a bath. .
[0023]
  Next, the secondary heat exchange device 4 will be described in detail. The secondary heat exchange device 4 performs heat exchange between the combustion gas whose temperature has decreased after the heat exchange with the hot water in the primary heat exchange device 3 and the water before entering the primary heat exchange device 3. Thus, it is provided to recover the latent heat of the water vapor in the combustion gas and improve the heat exchange efficiency.
  As shown in FIGS. 3 and 4, the secondary heat exchange device 4 includes a case member 20 having a combustion gas introduction port 20 a and a combustion gas discharge port 20 b, and a plurality of flow members disposed inside the case member 20. A laminated heat exchanger 21 (hereinafter referred to as a heat exchanger 21) having a structure in which a path forming plate 30 is laminated is provided.
[0024]
  A combustion gas inlet 20a for introducing combustion gas from the primary heat exchange device 3 is formed at the rear end of the case member 20, and the front end of the case member 20 discharges combustion gas to the outside. The combustion gas discharge port 20b is formed. Further, the upper end of the case member 20 is closed by the top plate 22. The bottom plate 23 of the case member 20 is inclined so that water generated by condensation of water vapor inside the case member 20 flows down, and a drain discharge pipe 24 extending downward is provided at the front end of the bottom plate 23. It has been. Since the condensed water generated inside the case member 20 shows acidity including nitrogen oxides and sulfur oxides in the combustion gas, it is neutralized by a neutralization device (not shown) connected to the drain discharge pipe 24. And then discharged to the outside.
[0025]
  As shown in FIGS. 3 to 6, the heat exchanger 21 has a structure in which a plurality of flow path forming plates 30 each having a flow path 36 through which hot water flows are stacked in front and back. The plurality of flow path forming plates 30 are joined by vacuum furnace brazing using a copper alloy brazing material or the like. As shown in FIG. 5, the plurality of laminated flow path forming plates 30 are sandwiched between left and right end plates 31, and the left end flow path forming plate 30 has a water supply port 32 and a hot water supply port 33. Is formed. Combustion gas flows from the upper side to the lower side between the plurality of laminated flow path forming plates 30. In order to increase the heat transfer area on the combustion gas side between the flow path forming plates 30. Outer fins 34 are interposed.
[0026]
  As shown in FIGS. 5 and 6, the flow path forming plate 30 is obtained by superposing two plate members 30a and 30b and joining these plate members 30a and 30b by vacuum furnace brazing. Between the plate members 30a and 30b, a water inflow portion 35 into which water flows in from the water supply port 32, and a U-shape formed so that the water flowing in from the water inflow portion 35 flows in the direction of the arrow in FIG. A flow path 36 and a hot water outflow portion 37 for sending hot water heated through the flow path 36 to the warm water outlet 33 are formed. Inner fins 38 for increasing the heat transfer area on the warm water side are provided in the flow path 36.
  As shown in FIGS. 5 and 6, each flow path forming plate 30 has a crimped portion 39 that is formed by the outer peripheral portions of the two plate members 30 a and 30 b and protrudes to the outside, and the plurality of flow path forming plates. A plurality of groove portions 40 are formed on the outer peripheral portion of the heat exchanger 21 by 30 crimping portions 39.
[0027]
  In this heat exchanger 21, the water introduced from the water supply port 32 branches to the flow path 36 of each flow path forming plate 30 and is heated by heat exchange with the combustion gas while passing through the flow path 36. Then, it merges again and is sent to the primary heat exchange device 3 from the hot water outlet 33.
  On the other hand, the combustion gas introduced into the inside of the case member 20 from the combustion gas inlet 20a is a flow path forming plate 30 that is stacked while heating the hot water flowing through the flow path 36, as indicated by the solid line arrows in FIG. The gas flows from above to below and is discharged from the combustion gas discharge port 20b to the outside. On the upper side of the heat exchanger 21, the gap seal described below that closes the gap between the case member 20 and the heat exchanger 21 so that the combustion gas does not bypass the heat exchanger 21 and flow to the combustion gas discharge port 20 b. A structure 50 is provided.
[0028]
  Next, the gap seal structure 50 unique to the present application will be described. The gap seal structure 50 closes the gap between the heat exchanger 21 and the case member 20, and a part of the combustion gas passes through the gap as shown by a dotted arrow in FIG. 4. This prevents the gas from flowing into the combustion gas discharge port 20b without exchanging heat with hot water.
[0029]
  As shown in FIGS. 3 and 4, the gap seal structure 50 is provided between the case member 20 and the heat exchanger 21 to prevent the combustion gas from bypassing the heat exchanger 21 and flowing to the combustion gas discharge port 20 b. Two closing plates 51 and 52 made of SUS304 are provided. The front closing plate 51 is relatively thick (for example, 0.5 mm), while the rear closing plate 52 is a thin plate (for example, 0.05 mm thick) whose front end portion can be easily elastically deformed. It consists of
[0030]
  The front closing plate 51 is attached to the case member 20 so that the position in the left-right direction can be adjusted with respect to the heat exchanger 21, and the case member 20 and the heat exchanger 21 are curved so as to hang down from the front to the rear. It arrange | positions so that the clearance gap between may be closed. On the other hand, the rear closing plate 52 is disposed so as to close the gap between the case member 20 and the heat exchanger 21 while being curved so as to hang down from the rear to the front. These two closing plates 51, 52 are pressed against the heat exchanger 21 by the top plate 22, and the position in the vertical direction does not shift inside the case member 20.
[0031]
  Here, most of the gap between the case member 20 and the heat exchanger 21 can be closed by the two closing plates 51 and 52, but as described above, the outer periphery of the heat exchanger 21 is closed. Since the plurality of groove portions 40 are formed, if the plurality of groove portions 40 are not blocked, a part of the combustion gas flows from the plurality of groove portions 40 to the combustion gas discharge port 20b. For this purpose, as shown in FIGS. 7 to 10, two end portions on the heat exchanger 21 side of the two closing plates 51 and 52 are provided with a plurality of blocking portions 40 on the outer peripheral portion of the heat exchanger 21. In order to close the plates 51 and 52 in an almost airtight manner, comb-shaped portions 53 and 54 in which a plurality of protruding pieces 53a and 54a protruding into the plurality of groove portions 40 are formed in a substantially comb-like shape are provided. A bent portion 53b bent backward is formed at the tip of the protruding piece 53a of the comb-shaped portion 53 of the front closing plate 51.
[0032]
  As shown in FIGS. 8 to 10, in the plurality of groove portions 40, the protruding piece 53 a of the front closing plate 51 protrudes into the groove portion 40 and abuts against the outer surface portion of the heat exchanger 21. The projecting piece 54a of the closing plate 52 becomes a bent portion 53b of the projecting piece 53a.At least partiallyIt is arranged in close contact. Further, the two comb-shaped portions 53 and 54 are disposed so as to be located at positions shifted in the left-right direction (the stacking direction of the flow path forming plate 30). For example,In the plan view shown in FIG.The comb-shaped portion 53 of the front closing plate 51 isleftThe comb-shaped portion 54 of the rear closing plate 52 isRight sideIt suffices if it is arranged close to
[0033]
  Here, the width in the left-right direction of the plurality of groove portions 40 is not necessarily constant due to factors such as manufacturing errors. Therefore, even if the width of the groove portions 40 varies, the plurality of protruding pieces 53a and 54a. The widths of the protruding pieces 53a and 54a of the comb-shaped portions 53 and 54 are formed so as to be slightly narrower than the width of the groove portion 40 so that the groove portions 40 can be blocked by projecting into the plurality of groove portions 40. . Therefore, as shown in FIG. 10, the gap d in the left-right direction is generated between the groove 40 and the protruding piece 53a only by protruding the protruding piece 53a of the one comb-tooth shaped portion 53 into the groove 40. Combustion gas leaks from this gap d. However, since the other protruding piece 54a is disposed at a position shifted in the left-right direction with respect to the protruding piece 53a, the gap d is closed by the protruding piece 54a.
[0034]
  As described above, since the rear closing plate 52 is formed of a thin plate, when the gas pressure of the combustion gas increases in an unsteady state, such as when the output of the burner 2 fluctuates, it is indicated by a chain line in FIG. As described above, the comb-shaped portion 54a is elastically deformed so as to be lifted. Then, the gap d closed by the protruding piece 54a is instantaneously opened, and a part of the combustion gas flows to the combustion gas discharge port 20b through the gap d.
[0035]
  Next, the operation and effect of the gap seal structure 50 will be described.
  As shown in FIG. 4, when the combustion gas is introduced into the secondary heat exchange device 4 from the combustion gas inlet 20 a, the space between the case member 20 and the heat exchanger 21 is substantially reduced by the two closing plates 51 and 52. Since most of the combustion gas is blocked, as shown by the solid line arrows in FIG. 4, the combustion gas passes through the plurality of flow path forming plates 30 while heating the hot water, and is secondary from the combustion gas discharge port 20 b. It is discharged to the outside of the heat exchange device 4.
[0036]
  Here, a groove portion 40 is formed on the outer peripheral portion of the heat exchanger 21 by a plurality of laminated flow path forming plates 30, and a part of the combustion gas passes through the plurality of groove portions 40 and the heat exchanger 21. Although it bypasses and flows into the combustion gas discharge port 20b, since the protruding pieces 53a and 54a of the comb-shaped portions 53 and 54 protrude into the plurality of grooves 40, the combustion gas leaks from the grooves 40. Can be suppressed.
[0037]
  Further, the width in the left-right direction of the protruding pieces 53a and 54a is narrower than the width of the groove portion 40. For example, when the protruding piece 53a is inserted into the groove portion 40 as shown in FIG. However, since the gap d can be closed by the other protruding piece 54a, the plurality of groove portions 40 can be closed almost airtightly by the two comb-shaped portions 53 and 54. Therefore, it is possible to improve the heat exchange efficiency by suppressing the combustion gas from being discharged from the combustion gas discharge port 20b without being heat exchanged by the heat exchanger 21 as much as possible.
[0038]
  Further, since the rear closing plate 52 is made of a thin plate that can be elastically deformed when the gas pressure of the combustion gas increases, the gas pressure of the combustion gas increases in an unsteady state such as when the output of the burner 2 fluctuates. When the gas pressure is increased, the comb-shaped portion 54 is elastically deformed so as to be lifted, as shown by a chain line in FIG. 9, and the gap d closed by the protruding piece 54a is instantaneously opened. The
[0039]
  Therefore, a part of the combustion gas flows through the gap d to the combustion gas discharge port 20b and the gas pressure is lowered, so that the fluctuation of the gas pressure is prevented from being amplified, and the flame of the burner 2 becomes unstable. It is possible to prevent vibration combustion from occurring in the water heater 1.
  As soon as the combustion gas instantaneously flows through the gap d, the gas pressure decreases, so that the elastically deformed comb-tooth shaped portion 54 returns to its original state and the gap d is closed again, and the gas pressure decreases. After that, the combustion gas does not leak from the groove 40 continuously.
[0040]
  Next, modified embodiments in which various modifications are made to the embodiment will be described. However, those having the same configuration as in the above embodiment are given the same reference numerals and description thereof is omitted as appropriate.
  1] As shown in FIG. 11, one or both of the upper side and the lower side of the portion where the comb-shaped portions 53 and 54 partially adhere to each other correspond to the caulking portion 39 as shown in FIG. A sealing member 60 made of synthetic resin (for example, made of PTFE) having a plurality of slits 60a and having excellent corrosion resistance may be provided. Alternatively, the seal member 60 may be interposed between the two comb-shaped portions 53 and 54. In addition to the two comb-shaped portions 53 and 54, the sealing member 60 closes the groove 40, so that the fuel gas can be almost completely prevented from flowing from the groove 40 to the combustion gas discharge port 20b. .
[0041]
  As in the above embodiment, in order to prevent vibration combustion, when the comb-tooth shaped portion 54 of the closing plate 52 is elastically deformed when the gas pressure rises, the combustion gas instantaneously flows through the groove portion 40. As shown in FIG. 13, when the sealing plate 61 having a plurality of slits 61a corresponding to the caulking portion 39 and the opening 61b is used and the closing plate 52 is elastically deformed and the comb-shaped portion 54 is lifted, The combustion gas may be instantaneously flowed to the combustion gas discharge port 20b through the opening 61b.
[0042]
  2] As shown in FIG. 14, a bent portion 74b that bends forward is formed in the protruding piece 74a of the comb-shaped portion 74 of the rear blocking plate 72, and the rear protruding piece 74a is heat-exchanged in the groove 40. The protruding piece 73a of the comb-shaped portion 73 of the front blocking plate 71 may be disposed so as to be in close contact with the upper surface of the bent portion 74b of the rear protruding piece 74a.
[0043]
  4] One of the two closing plates 51 and 52 can be omitted. In this case, since the plurality of groove portions 40 are closed with the comb-shaped portion of one closing plate, a small amount of combustion gas flows from the gap d shown in FIG. 10 to the combustion gas discharge port 20b. Compared with the case where the groove 40 is not blocked, the heat exchange efficiency can be remarkably improved.
[0044]
  Further, when the gap is closed with one closing plate, the closing plate 80 is located between the plurality of protruding pieces 81a of the comb-shaped portion 81 as shown in FIGS. The plurality of slits 81b corresponding to the plurality of crimped portions 39, and the plurality of bent portions 81c formed in parallel with the slits 81b at positions on the extension of the plurality of slits 81b and alternately bent to the opposite side It can also be configured to have a plurality of bent portions 81c.
[0045]
  With this configuration, as shown in FIG. 16, the projecting piece 81a can be tilted up and down with respect to the left-right direction by the bent portion 81c formed in parallel with the slit 81b. That is, when the comb-shaped portion 81 is extended to the left and right, the left and right widths of the protruding piece 81a are formed to be larger than the width of the groove portion 40, and the comb-shaped portion 81 is bent at the bent portion 81c. Thus, since the protruding piece 81a can be inserted into the groove 40 with the protruding piece 81a inclined with respect to the left-right direction, even when the width in the left-right direction of the groove 40 varies due to factors such as manufacturing errors, The groove part 40 can be closed almost airtight with the protruding piece 81a.
[0046]
  5] As shown in FIGS. 17 and 18, a closing plate 91 that closes the space between the case member 20 and the heat exchanger 21, and a coil spring 92 that can extend in the left-right direction, the outer peripheral portion of the heat exchanger 21. The gap seal structure 90 may be configured such that a coil spring 92 that closes the groove 40 in a substantially airtight manner is provided, and the tip of the closing plate 91 on the heat exchanger 21 side is brought into contact with the coil spring 92. Therefore, even when the width of the groove 40 in the left-right direction varies due to factors such as manufacturing errors, the coil spring 92 can be expanded and contracted so that a part of the coil spring 92 can be pushed into the plurality of grooves 40. It is possible to improve the heat exchange efficiency by closing in an almost airtight manner.
[0047]
【The invention's effect】
  According to the invention of claim 1, in order to prevent a part of the combustion gas from flowing between the case member and the laminated heat exchanger from bypassing the laminated heat exchanger and flowing to the combustion gas discharge port, The space between the case member and the stacked heat exchanger can be closed.
  Furthermore, since the comb-shaped portion in which the protruding pieces protruding into the plurality of grooves are formed in a substantially comb-like shape is provided at the tip portion of the closing plate on the laminated heat exchanger side, the laminated heat The plurality of grooves on the outer peripheral portion of the exchanger can also be closed, and the space between the case member and the stacked heat exchanger can be closed in an almost airtight manner. Accordingly, it is possible to improve the heat exchange efficiency by suppressing the combustion gas from flowing from the groove portion to the combustion gas discharge port by bypassing the stacked heat exchanger.
  Moreover, the protruding piece can be inclined with respect to the stacking direction of the flow path forming plate by the bent portion formed in parallel with the slit. Therefore, in a state where the comb-shaped portion is extended in the stacking direction, the protruding piece is formed so that the width in the stacking direction is slightly wider than the width of the groove portion, and the comb-shaped portion is bent at the bent portion, Wide protrusion by tilting the protruding piece with respect to the stacking direction The part can be projected into the groove part, and the groove part can be closed in an almost airtight manner by the protruding piece.
[0048]
  According to the invention of claim 2, in order to close the plurality of grooves on the outer peripheral portion of the laminated heat exchanger in a substantially airtight manner by the plurality of closing plates, the tip of the plurality of closing plates on the side of the stacked heat exchanger is provided. Since the comb-shaped portions in which the plurality of projecting pieces projecting into the plurality of groove portions are formed in a substantially comb-tooth shape are provided, the following effects can be obtained.
[0049]
  The width of the plurality of groove portions is not necessarily constant due to factors such as manufacturing errors.In order to project the protruding piece into the groove portion even when the width of the groove portion varies, the width of the protruding piece is larger than the width of the groove portion. Although it is necessary to keep it narrow, the protruding pieces and the groove portions of the comb-shaped portion are arranged by arranging the plurality of closing plates so that the comb-shaped portions of the plurality of closing plates are displaced in the stacking direction of the flow path forming plate. Can be closed by the protruding piece of another comb-shaped portion disposed so as to be shifted from the comb-shaped portion, so that the combustion gas bypasses the stacked heat exchanger from the groove portion. The flow to the combustion gas discharge port can be prevented almost completely, and the heat exchange efficiency can be improved.
[0050]
  According to the invention of claim 3, the plurality of closing plates areIt consists of two closing plates, and in each groove, the protruding piece of the comb-shaped portion of one closing plate and the protruding piece of the comb-shaped portion of the other closing plateAt least partially in close contact, andOf the two obstruction platesSince the two comb-shaped portions are disposed at positions shifted in the stacking direction of the flow path forming plate, the comb-shaped portion of the comb-shaped portion generated by making the width of the protruding piece narrower than the width of the groove portion The gap between the protruding piece and the groove portion can be closed by the protruding piece of the comb-shaped portion disposed at a position shifted from the comb-shaped portion in the stacking direction.
[0051]
[0052]
  Claim4According to the invention, since at least one of the plurality of closing plates is formed of a thin metal plate that can be elastically deformed when the gas pressure of the combustion gas increases, the gas pressure of the combustion gas in the unsteady state of the burner. When the pressure rises, the closed gas plate made of a thin metal plate is elastically deformed by the increased gas pressure, and the comb-shaped portion is separated from the groove. Accordingly, the combustion gas temporarily bypasses the stacked heat exchanger and escapes from the groove portion to the combustion gas discharge port, and the increased gas pressure is reduced to suppress the occurrence of vibration combustion. Further, since the closing plate returns to the original state when the gas pressure is lowered, the comb-shaped portion returns to the state of closing the groove portion, and combustion gas does not leak from the groove portion after the gas pressure is lowered. In addition, the same effects as those of the second or third aspect can be obtained.
[0053]
  Claim5According to the invention, a plurality of coil springs are provided between the case member and the stacked heat exchanger to close the plurality of grooves in a substantially airtight manner, and the coil spring is provided on the stacked heat exchanger side of the closing plate. By contacting the tip, the space between the case member and the laminated heat exchanger can be closed in an almost airtight manner, so that the combustion gas bypasses the laminated heat exchanger and flows to the combustion gas discharge port. And the heat exchange efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a water heater according to an embodiment of the present invention.
FIG. 2 is a side view of the primary and secondary heat exchange devices.
FIG. 3 is a front view of a secondary heat exchange device.
4 is a side view of FIG. 3. FIG.
FIG. 5 is a front view of a stacked heat exchanger.
6 is a side view of FIG. 5. FIG.
FIG. 7 is a plan view of a closing plate.
FIG. 8 is a partial plan view of a comb-shaped portion in a state where a groove portion is closed.
9 is a cross-sectional view taken along line IX-IX in FIG.
10 is a view taken along line X-X in FIG. 9;
FIG. 11 is a diagram corresponding to FIG.
FIG. 12 is a partial plan view of a seal member.
FIG. 13 is a partial plan view of a seal member.
FIG. 14 is a diagram corresponding to FIG.
FIG. 15 is a diagram corresponding to FIG.
16 is a cross-sectional view taken along line XVI-XVI in FIG.
FIG. 17 is an enlarged view of a main part of a heat exchanger in a state where a groove is closed with a coil spring in a modified embodiment.
18 is a cross-sectional view taken along line XVIII-XVIII in FIG.
[Explanation of symbols]
4 Secondary heat exchanger
20 Case member
20a Combustion gas inlet
20b Combustion gas outlet
21 Stacked heat exchanger
30 flow path forming plate
40 groove
50,90 Gap seal structure
51, 52, 71, 72, 80, 91 Blocking plate
53, 54, 73, 74, 81 Comb-shaped part
53a, 54a, 73a, 74a, 81a Projecting piece
81b slit
81c bent part
92 Coil spring

Claims (5)

In a heat exchange device comprising a case member having a combustion gas inlet and a combustion gas outlet, and a stacked heat exchanger having a structure in which a plurality of flow path forming plates are stacked inside the case member,
Providing a blocking plate to block between the case member and the laminated heat exchanger,
Provided on the laminated heat exchanger side of the closing plate is a comb-shaped portion in which a plurality of protruding pieces projecting into a plurality of grooves on the outer peripheral portion of the laminated heat exchanger are formed in a comb shape ,
The blocking plate includes a plurality of slits positioned between the plurality of protruding pieces of the comb-shaped portion, and a plurality of bent portions formed in parallel with the slits at positions on the extension of the plurality of slits. And a plurality of bent portions bent in the opposite direction to the gap seal structure of the heat exchange device. In a heat exchange device comprising a case member having a combustion gas inlet and a combustion gas outlet, and a stacked heat exchanger having a structure in which a plurality of flow path forming plates are stacked inside the case member,
Providing a plurality of blocking plates that block between the case member and the laminated heat exchanger,
Provided on each side of the stacked heat exchanger of the plurality of closing plates are comb-tooth shaped portions each having a plurality of protruding pieces protruding into a plurality of grooves on the outer peripheral portion of the stacked heat exchanger in a comb-tooth shape
A gap seal structure for a heat exchanging device. The plurality of blocking plates are composed of two blocking plates, and the protruding pieces of the comb-shaped portion of one closing plate and the protruding pieces of the comb-shaped portion of the other closing plate are at least partially in close contact with each other in each groove portion. The two comb-tooth-shaped portions of the two blocking plates that are disposed in a state are disposed so as to be located at positions shifted in the stacking direction of the flow path forming plates. The gap seal structure of the heat exchange device.   4. The gap seal of the heat exchange device according to claim 2, wherein at least one of the plurality of closing plates is formed of a thin metal plate that can be elastically deformed when the gas pressure of the combustion gas increases. Construction. In a heat exchange device comprising a case member having a combustion gas inlet and a combustion gas outlet, and a stacked heat exchanger having a structure in which a plurality of flow path forming plates are stacked inside the case member,
In order to prevent the combustion gas from bypassing the laminated heat exchanger and flowing to the combustion gas outlet, a blocking plate is provided to block between the case member and the laminated heat exchanger,
A coil spring that is extendable in the laminating direction of the flow path forming plate, and provided with a coil spring that closes a plurality of grooves in the outer peripheral portion of the laminated heat exchanger substantially in an airtight manner;
The front end of the closing plate on the laminated heat exchanger side was brought into contact with the coil spring,
A gap seal structure for a heat exchanging device.

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