JP2017172902A - Gas water heater - Google Patents

Abstract

A gas water heater having a secondary heat exchanger with high strength is provided. A primary heat exchanger disposed immediately above a burner and a combustion gas passing through the primary heat exchanger are provided. A gas water heater in which water flowing through the primary heat exchanger and the secondary heat exchanger (12) is heated by the combustion gas generated in the burner. The secondary heat exchanger (12) includes a cylindrical case (17), end plates (41 to 44, 51 to 54) that respectively close both ends of the case (17), and end plates (41 to 41). The heat exchange tubes (31 to 34), both ends of which are supported by 44, 51 to 54 and in which the combustion gas flows, and fins disposed inside these heat exchange tubes (31 to 34), [Selection] Figure 2

Description

  The present invention relates to a gas water heater having two heat exchangers.

  2. Description of the Related Art As a water heater used at home and the like, a gas water heater that warms water by the heat of combustion gas generated in a burner is known. Some gas water heaters include a primary heat exchanger disposed immediately above a burner and a secondary heat exchanger through which combustion gas that has passed through the primary heat exchanger flows. There is a technique disclosed in Patent Document 1 as a conventional technique related to a secondary heat exchanger provided in a gas water heater.

  Please refer to FIG. FIG. 10 is a reproduction of FIG. 2C of Patent Document 1. The secondary heat exchanger 100 includes a case 130 in which a gas introduction hole 110 and a gas discharge hole 120 are formed on opposite side walls (the upper portion of the opened case 130 is covered with another member), and the case 130. A pipe 140 through which water flows inside, a water inlet 150 provided outside the case 130 and connected to the inlet of the pipe 140, and water connected to the outlet of the pipe 140 provided outside the case 130. And a discharge unit 160.

  The combustion gas flows into the case 130 from the gas introduction hole 110. On the other hand, the water flows from the water introduction part 150 into the pipe 140 disposed in the case 130. In the case 130, the heat of the combustion gas is transferred to water through the pipe 140. The warmed water is discharged from the water discharge unit 160, and the combustion gas is discharged from the gas discharge hole 120.

  By the way, during normal use, the user of the water heater repeats water supply and water stoppage. At this time, a so-called water hammer phenomenon may occur, and a large load is applied to the pipe of the secondary heat exchanger. For this reason, the pipe | tube of a secondary heat exchanger requires the intensity | strength of the grade which can endure such a load.

JP 2014-70800 A

  This invention makes it a subject to provide the gas water heater which has a secondary heat exchanger with high intensity | strength.

According to the first aspect of the present invention, the burner has a primary heat exchanger disposed immediately above the burner, and a secondary heat exchanger through which the combustion gas that has passed through the primary heat exchanger flows. In the gas water heater in which the water flowing through the primary heat exchanger and the secondary heat exchanger is heated by the combustion gas generated in
The secondary heat exchanger includes a cylindrical case, end plates that close both ends of the case, a plurality of heat exchange tubes that are supported at both ends by the end plates and into which the combustion gas flows, There is provided a gas water heater characterized by comprising fins arranged inside these heat exchange tubes.

As described in claim 2, preferably, the inside of the case is partitioned into a plurality of rooms by a water channel regulating body that regulates the flow direction of the water,
A part of the heat exchange tube is supported by the water channel regulator.

As described in claim 3, preferably, the water channel regulating body includes a partition plate that partitions the inside of the case, and a gate plate that partitions the inside of the case and allows the water to pass through,
The gate plate is formed with a passage through which the water passes, and the passages adjacent to each other in the water flow direction have different heights from the bottom of the case.

  According to a fourth aspect of the present invention, preferably, the water channel restricting body is in contact with a substantially opposed portion of the case or a substantially opposed portion of the end plate.

  In the invention according to claim 1, the secondary heat exchanger includes a cylindrical case, an end plate, a plurality of heat exchange tubes through which combustion gas flows, fins disposed inside these heat exchange tubes, It consists of. That is, water flows in the region surrounded by the case and the end plate, and the combustion gas flows in the heat exchange tube. For this reason, a water pressure is applied to the heat exchange tube so as to be crushed inward. Here, the heat exchange tube is supported by fins from the inside. A fin has the effect | action resisting the force added to the direction which crushes a heat exchange tube. Thereby, it can suppress that a heat exchange tube is crushed by water pressure. By using such a high-strength heat exchange tube, a high-strength secondary heat exchanger can be provided. Further, more heat of the combustion gas can be recovered and transferred to water by the fins arranged inside the heat exchange tube.

  In the invention which concerns on Claim 2, the inside of the case is divided into the some room by the water-path regulation body which regulates the flow direction of water. In other words, water is restricted from flowing from one room to an adjacent room inside the case. Water can be prevented from flowing directly from the water inlet to the water outlet. Since the water flow path can be lengthened, more heat energy can be recovered.

  In addition, a part of the heat exchange tube is supported by the water channel regulating body. Both ends of the heat exchange tube are supported by the end plate and are also supported by the water channel regulating body. Therefore, the strength of the heat exchange tube is increased.

  In the invention according to claim 3, the water channel regulating body includes a partition plate that partitions the inside of the case, and a gate plate that partitions the inside of the case and allows water to pass therethrough. The passages adjacent to each other in the water flow direction have different heights from the bottom of the case. That is, the water channel regulating body is configured by combining plates. Therefore, the water channel regulating body can be provided in the case without pressing the space where the heat exchange tube is arranged.

  In addition, the passage portions formed on the gate plate and adjacent to each other have different heights from the bottom portion of the case. Therefore, in each room sandwiched between the gate plates, water flows obliquely with respect to the bottom of the case. Since water flows in a meandering manner in the case, the flow path of water becomes long. As a result, more heat energy can be recovered.

  In the invention which concerns on Claim 4, the water path control body is contact | abutted or joined to the site | part which opposes substantially in a case or the site | part which opposes substantially in an end plate. In other words, the casing composed of the case and the end plate is supported from the inside by the water channel regulating body. For this reason, the strength of the casing is increased. When the water channel regulator is joined, it becomes easy to withstand the water pressure of the water flowing inside the housing.

It is a perspective view of the primary heat exchanger and secondary heat exchanger which are provided in the gas water heater by Example 1 of this invention. It is a disassembled perspective view of the secondary heat exchanger shown by FIG. FIG. 3 is an exploded perspective view of the water channel regulating body shown in FIG. 2. It is a figure explaining the state by which the heat exchange tube was fitted by the water channel regulation body shown by FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is the figure explaining the flow path of the water which passes the inside of the secondary heat exchanger shown by FIG. It is a front view of the gate board provided in the gas water heater by Example 2 of this invention. It is a disassembled perspective view of the waterway regulation body by Example 3 of this invention. It is a figure explaining the structure which supports a part of channel regulation body by Example 4 of this invention. It is a perspective view of the secondary heat exchanger by a prior art.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that In represents a side where combustion gas is introduced into the secondary heat exchanger, and Ou represents a side where combustion gas is discharged from the secondary heat exchanger.
<Example 1>

  Please refer to FIG. FIG. 1 shows a heat exchanger 10 provided inside a gas water heater according to the present invention. The heat exchanger 10 includes a primary heat exchanger 11 disposed immediately above the burner, and a secondary heat exchange in which the combustion gas that is placed on the primary heat exchanger 11 and passes through the primary heat exchanger 11 flows. And vessel 12. The water flowing through the primary heat exchanger 11 and the secondary heat exchanger 12 is warmed by the combustion gas generated in the burner. Hereinafter, the details of the secondary heat exchanger 12 will be described.

  Please refer to FIG. The secondary heat exchanger 12 is provided in a cylindrical case 17 in which an upper case half 16 having a water discharge part 15 is superimposed on a lower case half 14 having a water introduction part 13, and the case 17. The water flow restricting plate 20 (water flow restricting body 20) for restricting the flow direction of the water, the first to fourth heat exchange tubes 31 to 34 fitted into the water flow restricting plate 20 and flowing the combustion gas, 1st-4th introduction side end plates 41-44 provided in end 31a-34a by the side where combustion gas of 1st-4th heat exchange tubes 31-34 is introduced, and these 1st-4th Combustion gas is discharged from the introduction side connection plate 45 for connecting the introduction side end plates 41 to 44, the introduction side cover 46 covering the introduction side connection plate 45, and the first to fourth heat exchange tubes 31 to 34. On the end portions 31b to 34b First to fourth discharge-side end plates 51 to 54, a discharge-side connection plate 55 for connecting the first to fourth discharge-side end plates 51 to 54, and the discharge-side connection plate 55. A discharge-side lid 56.

  The lower case half 14 is formed by bending both ends of a rectangular plate, and includes a bottom portion 14a and lower side wall portions 14b and 14b extending upward from both ends of the bottom portion 14a. The upper case half 16 is formed by bending both ends of a rectangular plate, and includes a ceiling portion 16a and upper side wall portions 16b and 16b extending downward from both ends of the ceiling portion 16a.

  The first to fourth introduction side end plates 41 to 44 are fitted into first to fourth introduction side fitting holes 45 a to 45 d formed in the introduction side connecting plate 45. The first to fourth introduction side end plates 41 to 44 and the introduction side connection plate 45 close the introduction side of the cylindrical case 17.

  The first to fourth discharge side end plates 51 to 54 are fitted into first to fourth discharge side fitting holes 55 a to 55 d formed in the discharge side connection plate 55. The first to fourth discharge side end plates 51 to 54 and the discharge side connection plate 55 block the discharge side of the cylindrical case 17. The discharge side cover 56 is formed with a discharge hole 57 through which the combustion gas that has passed through the first to fourth heat exchange tubes 31 to 34 is discharged.

  Please refer to FIG. The water channel regulating plate 20 includes a partition plate 60 that partitions the longitudinal direction of the case 17 (see FIG. 2), first to third gate plates 71 to 73 that partition the lateral direction of the case 17 and allow water to pass through, Consists of.

  The partition plate 60 has a rectangular shape. The partition plate 60 is formed with linear slits 60 a to 60 c for engaging with the first to third gate plates 71 to 73. The slits 60a to 60c are formed at equal intervals. The slits 60a and 60c are each formed from the lower part of the partition plate 60 to a height that is substantially half of the partition plate. The slit 60b is formed from the upper part of the partition plate 60 to approximately half the height of the partition plate.

  The partition plates partitioned by the slits 60a to 60c are referred to as first to fourth partition portions 61 to 64. The first partition 61 is formed with four first fitting holes 61a into which the first heat exchange tube 31 (see FIG. 1) is fitted. Similarly, the second to fourth fitting holes 62a into which the second to fourth heat exchange tubes 32 to 34 (see FIG. 1) are fitted respectively into the second to fourth partition portions 62 to 64. Four to 64a are formed. A partition plate passage portion 65 through which water passes is formed at the lower portion of the fourth partition portion 64. The partition plate passage portion 65 is rolled upward from the lower portion and has a rectangular shape.

  Next, the first to third gate plates 71 to 73 will be described. A linear first slit 71 a is formed in the first gate plate 71. The first slit 71 a is formed from the upper part of the first gate plate 71 to a height that is substantially half of the first gate plate 71.

  Further, the first gate plate 71 is formed with first passage portions 81a and 81b through which water passes. The distances from the center in the longitudinal direction of the first gate plate 71 to the first passage portions 81a and 81b are equal to each other. The first passage portion 81a has a semicircular shape that is curled downward from the top. Similarly, the first passage portion 81b has a semicircular shape that is rolled upward from the lower portion.

  In the center of the second gate plate 72, a linear second slit 72a is formed. The second slit 72 a is formed from the lower part of the second gate plate 72 to a height that is substantially half of the second gate plate 72.

  Further, the second gate plate 72 is formed with second passage portions 82a and 82b through which water passes. The distances from the center in the longitudinal direction of the second gate plate 72 to the second passage portions 82a and 82b are equal to each other. The second passage part 82a has a semicircular shape that is scooped upward from the lower part. Similarly, the second passage portion 82b has a semicircular shape curled downward from the upper part.

  A linear third slit 73 a is formed at the center of the third gate plate 73. The third slit 73 a is formed from the upper part of the third gate plate 73 to a height that is substantially half of the third gate plate 73.

  Further, the third gate plate 73 is formed with third passage portions 83a and 83b through which water passes. The distances from the center in the longitudinal direction of the third gate plate 73 to the third passage portions 83a and 83b are equal to each other. The third passage portions 83a and 83b each have a semicircular shape.

  Please refer to FIG. FIG. 4 shows a state where the first to fourth heat exchange tubes 31 to 34 are fitted to the water channel restriction plate 20. Four first heat exchange tubes 31 are provided. Each of the first heat exchange tubes 31 has a flat shape and has first fins 31c inside. Similarly, the 2nd-4th heat exchange tubes 32-34 are provided, and each has a flat shape and has the 2nd-4th fins 32c-34c inside.

  The first to fourth heat exchange tubes 31 to 34 have the same shape and size. The first to fourth fins 31c to 34c have the same shape and size. Furthermore, the introduction side end plates 41 to 44 and the discharge side end plates 51 to 54 have the same shape and size.

  Please refer to FIG. 2 and FIG. An upper portion 66 of the partition plate 60 of the water channel regulating plate 20 is in contact with the ceiling portion 16 a of the upper case half 16. The lower part 67 of the partition plate 60 is in contact with the bottom part 14 a of the lower case half 14.

  Note that the upper portion 66 of the partition plate 60 may be joined to the ceiling portion 16 a of the upper case half 16. Similarly, the lower portion 67 of the partition plate 60 may be joined to the bottom portion 14 a of the lower case half 14.

  The introduction side end 75 of the first gate plate 71 is in contact with the introduction side connection plate 45. The discharge side end portion 76 of the first gate plate 71 is in contact with the discharge side connection plate 55.

  Next, the operation and effect of the present invention will be described.

  Please refer to FIG. 1 and FIG. The secondary heat exchanger 12 includes a cylindrical case 17, introduction side and discharge side end plates 41 to 54, introduction side and discharge side connection plates 45 and 55, and first to fourth heat exchange tubes 31 to 41. 34 and fins arranged inside these heat exchange tubes 31 to 34.

  The water flows in a region surrounded by the case 17, the introduction side and discharge side end plates 41 to 54, and the introduction side and discharge side connection plates 45 and 55. On the other hand, the combustion gas that has passed through the primary heat exchanger 11 is introduced into the secondary heat exchanger 12 through an introduction opening 47 formed in the lower part of the introduction side connection plate 45. Thereafter, the combustion gas passes through the insides of the first to fourth heat exchange tubes 31 to 34 (see FIG. 4) and is discharged from the discharge holes 57 formed in the discharge-side lid 56.

  Since water flows around the first heat exchange tube 31, water pressure is applied to the first heat exchange tube 31 so as to be crushed inward. Here, the first heat exchange tubes 31 are each supported by the first fins 31c from the inside. The 1st fin 31c has the effect | action resisting the force added to the direction which crushes 31st 1st heat exchange tubes. Thereby, it can suppress that the 1st heat exchange tube 31 is crushed by water pressure. The same applies to the second to fourth heat exchange tubes 32 to 34. By using such high strength first to fourth heat exchange tubes 31 to 34, a high strength secondary heat exchanger can be provided.

  Please refer to FIG. The inside of the case 17 is partitioned into a plurality of rooms by a water channel regulating plate 20 that regulates the direction of water flow. That is, in the case 17, water is restricted from flowing from one room to an adjacent room. Water can be prevented from flowing directly from the water introduction part 13 toward the water discharge part 15 (at the time of heat exchange, the first to fourth fitting holes 61a to 64a are formed by the heat exchange tubes 31 to 34, respectively. Is blocked). Since the water flow path can be lengthened, more heat energy can be recovered.

  The water channel regulating plate 20 includes a partition plate 60 that partitions the inside of the case 17, and first to third gate plates 71 to 73 that partition the inside of the case 17 and allow water to pass therethrough. Since the water channel restriction plate 20 is configured by combining plates, the case 17 does not press the space where the first to fourth heat exchange tubes 31 to 34 (see FIG. 1) are arranged. The water introduced from the water introduction part 13 passes through the first to third passage parts 81a to 83a, is folded back at the partition plate passage part 65, and further, the third passage part 83b to the first passage part. It passes through 81b and is discharged from the water discharge portion 15.

  Here, the first and second passage portions 81 a and 82 a formed on the gate plates 71 and 72 and adjacent to each other have different heights from the bottom portion 14 a of the lower case half 14. The first passage portion 81 a is formed on the upper part of the first partition plate 71. The second passage portion 82 b is formed in the lower part of the second partition plate 72. Therefore, the water from the first passage portion 81 a toward the second passage portion 82 b flows obliquely with respect to the bottom portion 14 a of the lower case half 14. The same applies to the other adjacent passage portions 82a to 81b. Since the water meanders and flows in the case 17, the flow path of the water becomes long. As a result, more heat energy can be recovered.

  Please refer to FIG. 4 and FIG. The lower part 67 of the partition plate 60 is in contact with the bottom part 14 a of the lower case half 14. That is, the first heat exchange tube 31 is supported by the introduction side and discharge side end plates 41, 51 and also by the partition plate 60. Therefore, the strength of the first heat exchange tube 31 is increased. The second to fourth heat exchange tubes 32 to 34 and the partition plate 60 have the same configuration. Therefore, the strength of the second to fourth heat exchange tubes 32 to 34 is also increased.

Please refer to FIG. 2 and FIG. An upper portion 66 of the partition plate 60 of the water channel regulating plate 20 is in contact with the ceiling portion 16 a of the upper case half 16. Further, as described above, the lower portion 67 of the partition plate 60 is in contact with the bottom portion 14 a of the lower case half 14. The introduction side end 75 of the first gate plate 71 is in contact with the introduction side connection plate 45. The discharge side end portion 76 of the first gate plate 71 is in contact with the discharge side connection plate 55. That is, the casing composed of the case 17 and the connection plates 45 and 55 is supported from the inside by the water channel restriction plate 20. For this reason, the strength of the casing composed of the case 17 and the connecting plates 45 and 55 is increased.
<Example 2>

  Please refer to FIG. Next, a second embodiment of the present invention will be described. In the second embodiment, the positions of the passage portions 91a to 93b formed in the first to third gate plates 91 to 93 are different. About another structure, it is the same as that of the secondary heat exchanger 12 of Example 1, and abbreviate | omits description while diverting a code | symbol.

  The second passage portion 92a formed on the second gate plate 92 is closer to the second slit 95 side than the first passage portions 91a and 93a formed on the first and third gate plates 91 and 93. Is formed. That is, the distance from the second slit 95 to the second second passage 92a is shorter than the distance from the first and third slits 94, 96 to the first and third passages 91a, 93a. .

  That is, the respective passage portions (for example, the first passage portion 91a and the second passage portion 92a) provided in the adjacent gate plates (for example, the first gate plate 91 and the second gate plate 92) are It is offset both vertically and horizontally. Other passage portions (for example, the second passage portion 92a and the third passage portion 93a) have the same configuration. Description is omitted.

  Also in the secondary heat exchanger employing the first to third gate plates 91 to 93, the predetermined effect of the present invention can be obtained. Furthermore, according to the first to third gate plates 91 to 93, the following specific effects can be obtained by the above configuration.

In a state where the water channel restriction plates adopting the first to third gate plates 91 to 93 are assembled (see FIG. 6), the first passage portion 91a and the second passage portion 92a have a distance from the bottom plate 14a. The distances from the slits 94 and 95 (partition plate 60 (see FIG. 6)) are also different. Therefore, water meanders not only in the height H direction but also in the width W direction. The flow path of the water in the case 17 becomes longer, and more heat energy can be recovered.
<Example 3>

  Please refer to FIG. Next, Embodiment 3 of the present invention will be described. In Example 3, the shape and support structure of the gate plates 71 to 73 (see FIG. 3) in Example 1 are different. About another structure, it is the same as that of the secondary heat exchanger 12 of Example 1, and abbreviate | omits description while diverting a code | symbol.

  The partition plate 60A has a rectangular shape, and a first fitting hole 61a to a fourth fitting hole 64a and a partition plate passage portion 65 are formed.

The first to third gate plates 71A to 73A are joined to one surface of the partition plate 60A. In the first to third gate plates 71A to 73A, first to third passage portions 81a to 83a are formed, respectively. The first to third gate plates 71B to 73B are joined to the other surface of the partition plate 60A. The first to third gate plates 71B to 73B are formed with first to third passage portions 81b to 83b, respectively.
<Example 4>

  Please refer to FIG. Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the support structures of the first to third gate plates 71A to 73A and the first to third gate plates 71B to 73B in the third embodiment are different. About another structure, it is the same as that of the secondary heat exchanger 12 of Example 1, and abbreviate | omits description while diverting a code | symbol.

  A first gate plate 71A, a second gate plate 72B, and a third gate plate 73A are joined to the bottom portion 14a of the lower case half 14. A first gate plate 71B, a second gate plate 72A, and a third gate plate 73B are joined to the ceiling portion 16a of the upper case half 16.

  In addition, as long as there exists an effect | action and effect of this invention, this invention is not limited to the structure of Examples 1-4, and these combination.

  The gas water heater of the present invention is suitable for a gas water heater installed at home.

DESCRIPTION OF SYMBOLS 10 ... Gas water heater 11 ... Primary heat exchanger 12 ... Secondary heat exchanger 13 ... Water introduction part 14 ... Lower case half 15 ... Water discharge part 16 ... Upper case half 17 ... Cases 31-34 ... First 1 tube to 4th tube 41 to 44... 1st introduction side end plate to 4th introduction side end plate 45... Introduction side connecting plate 46... Introduction side lid 47 .. introduction opening 51 to 54. Discharge side end plate to fourth discharge side end plate 55... Discharge side end plate 56... Discharge side lid 57 .. discharge hole 60 .. partition plate 61 to 64... First partition part to fourth partition part 65. Partition plate passage part 66 ... upper part 67 ... lower part 71 to 73 ... first gate plate to third gate plate 75 ... introduction side end part 76 ... discharge side end part 81a, b to 83a, b ... first passage part -3rd passage part 91a, b-93a, ... the first passage part to third passage part

Claims (4)

A primary heat exchanger that is disposed immediately above the burner through which the combustion gas generated in the burner passes, and a secondary heat exchanger through which the combustion gas that has passed through the primary heat exchanger flows, In a gas water heater in which water flowing through the primary heat exchanger and the secondary heat exchanger is heated by combustion gas,
The secondary heat exchanger includes a cylindrical case, end plates that close both ends of the case, a plurality of heat exchange tubes that are supported at both ends by the end plates and into which the combustion gas flows, A gas water heater comprising: fins arranged inside these heat exchange tubes.   The gas water heater according to claim 1, wherein the inside of the case is partitioned into a plurality of rooms by a water channel regulating body that regulates a flow direction of the water. The water passage regulating body is composed of a partition plate for partitioning the inside of the case, and a gate plate for partitioning the interior of the case and allowing the water to pass through,
3. The gate plate is formed with a passage portion through which the water passes, and the passage portions adjacent to each other in the water flow direction have different heights from the bottom of the case. Gas water heater.   The said water path control body is contact | abutted or joined to the site | part which opposes substantially in the said case, or the site | part which opposes substantially in an end plate, The Claim 2 or Claim 3 characterized by the above-mentioned. Gas water heater.

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