JP2008025976A - Heat exchanger and hot water device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of providing high heat exchange efficiency by increasing a water distribution quantity to an outer circumferential part with a large heat conducting area out of a plurality of spiral water pipe tubular parts disposed in a lap-wound state. <P>SOLUTION: The heat exchanger B comprises a plurality of water pipes P stored in a case 7 into which combustion gases are introduced, and having a plurality of spiral tubular parts 5 disposed in a lap-wound state; a chamber 62 communicably leading to end openings 53 and 54 of the water pipes P; and headers 6A and 6B including a chamber 62 communicably leading to the end openings 53 and 54 and openings 61a and 61b for water introduction or hot water supply. At least one of the openings 61a and 61b of the headers 6A and 6B is disposed to be closer to an end opening 53" or 54" of the water pipe P having an outermost peripheral spiral tubular part 5" than to an end opening 53' or 54' of a water pipe P having an inner most spiral tubular part 5', and formed on a wall surface facing the end opening 53" or 54" of the water pipe P of the headers 6A and 6B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger used for a purpose of generating hot water by performing heat recovery from a fluid such as combustion gas using a so-called spiral water pipe, and a hot water apparatus provided with the heat exchanger. In the present invention, the water supplied into the water pipe is not limited to normal water such as tap water, but is a concept including, for example, an antifreeze liquid used for hot water heating and the like and a liquid similar thereto.

  As a specific example of a conventional heat exchanger, there is a case in which a spiral tubular body portion of a plurality of water tubes is arranged in a substantially concentric overlapping shape in a case where combustion gas is introduced (for example, (See Patent Documents 1 to 3). The spiral tube body recovers heat from the combustion gas, and hot water in the water pipe is heated by the heat recovery. In the heat exchanger having such a configuration, it is possible to increase the heat transfer area and increase the heat recovery amount while relatively reducing the total number of water tubes. For this reason, compared with, for example, a multi-tube heat exchanger in which a large number of linearly extending water pipes are housed in a case, the overall structure can be simplified and the manufacturing cost can be reduced.

  In a heat exchanger using a spiral water pipe, when connecting a water inlet pipe or a hot water outlet pipe to a plurality of water pipes, the water inlet pipe or the hot water outlet pipe is connected to each of the water pipes. The number of pipes increases, and the piping structure becomes complicated. Therefore, as a means for solving such a problem, like other heat exchangers such as a multi-tube heat exchanger, a header for incoming and outgoing water is connected to each end of each of the plurality of water pipes. Means for connecting a water inlet pipe and a hot water outlet pipe to the header of the above (for example, see Patent Document 3).

  However, the prior art has the following points to be improved.

  That is, the plurality of spiral tube portions are arranged in a substantially concentric wrapping shape, and their winding diameters are different from each other. For this reason, the lengths of the plurality of spiral tubular body portions are not the same, and the spiral tubular body portion on the outer peripheral side is longer than the inner peripheral side. Therefore, when the diameters of the pipe parts are the same or substantially the same, the inner pipe side has a smaller flow resistance than the outer circumference side, and the header is used. When water is passed through a plurality of water pipes, the water tends to flow more easily toward the water pipe having the spiral pipe part on the inner peripheral side than the water pipe having the spiral pipe part on the outer peripheral side. There is. Conventionally, when water is passed through a plurality of water pipes using a header, no means for positively eliminating such a deviation in the water flow rate has been taken.

  On the other hand, the spiral tube portion on the outer peripheral side is longer than the spiral tube portion on the inner periphery side, so its heat transfer area is large, and the heat transfer area of the outermost spiral tube portion is Is the largest. However, as described above, in the conventional heat exchanger, while the amount of water passing through the spiral tube portion on the inner peripheral side with a small heat transfer area is large, the spiral tube portion on the outer peripheral side with a large heat transfer area. Therefore, it can be said that the helical tube body on the outer peripheral side having a large heat transfer area is not sufficiently utilized for heat exchange. In the prior art, there is still a point to be improved in this respect.

  Note that FIG. 3 of Patent Document 3 describes a configuration in which a water inlet pipe or a hot water outlet pipe is connected to one end in the longitudinal direction of a header connected to the ends of a plurality of water pipes. At first glance, this configuration is similar to the present invention at first glance, but with such a configuration, as described below, it is difficult to properly solve the above-described problems. That is, in the configuration described in the same document, each end of a plurality of water pipes is connected to the side surface of the header, whereas the water intake pipe or the hot water discharge pipe is provided on the upper surface of one end in the longitudinal direction of the header. The direction of the water inlet or outlet opening formed in the header is different from the direction of the end opening of each water pipe. For this reason, for example, water that has flowed into the header from the water inlet pipe sequentially flows into the end openings of the plurality of water pipes while flowing in the header in the longitudinal direction. However, when the end openings of a plurality of water pipes are close to each other or when the water pressure is high, the spiral tube body on the outer peripheral side having a large heat transfer area can be obtained only by the action of the water flow as described above. It is difficult to increase the water flow rate of the department.

Japanese Patent Laid-Open No. 62-288446 No. 6-8442 Japanese Patent No. 2835286

The present invention has been conceived under such circumstances, and among the plurality of helical tube portions arranged in a plurality of water tubes, the outer peripheral side having a large heat transfer area is provided. To provide a heat exchanger capable of obtaining a high heat exchange efficiency by increasing the amount of heat flow through the spiral tube body portion, thereby increasing the amount of heat recovered by the portion, and a hot water device equipped with the heat exchanger Is the issue.

  In order to solve the above problems, the present invention takes the following technical means.

  The heat exchanger provided by the first aspect of the present invention includes a case in which a heating fluid to be heat exchanged is introduced into the inside, and a plurality of helical tube portions accommodated in the case. And a plurality of water pipes in which the plurality of spiral tubular body portions are arranged in a substantially concentric overlapping shape, and connected to both ends of the plurality of water pipes, and ends of the plurality of water pipes At least one of the pair of headers, comprising: a chamber communicating with the chamber opening; and a pair of headers having a water inlet or a water outlet opening communicating with the chamber. The opening for water entry or hot water is the end opening of the second water pipe having the outermost spiral tube portion than the end opening of the first water tube having the innermost spiral tube portion. And facing the end opening of the second water pipe out of the header It is characterized by being formed in that wall.

  According to such a configuration, as will be described below, the amount of water passing through the outer circumferential spiral tube body portion can be increased as compared with the conventional description. That is, for example, when a header for incoming water is configured as intended by the present invention, the opening for incoming water of this header is more than the end opening of the first water pipe having the innermost spiral tube portion. In addition to being close to the end opening of the second water pipe having the outermost spiral tubular body portion, it is formed on the wall portion facing the end opening of the second water pipe. Accordingly, the opening for entering water and the end opening of the second water pipe face each other, and the flow directions of water passing through them coincide with each other. For this reason, much of the water that has flowed into the chamber from the water inlet opening of the header easily flows into the end opening of the second water pipe as it is, and its flow rate increases. According to the present invention, a water pipe having a spiral tubular body on the outermost periphery or other outer peripheral side than the case where the opening for water entry is simply brought closer to the end opening of the second water pipe. It is possible to increase the amount of water flow. On the other hand, in the header for hot water, inflow of hot water from the end opening of the water pipe having the spiral tubular body portion on the outer peripheral side to the hot water opening for the header is promoted by the same principle as described above. It is possible to increase the water flow rate of the water pipes having the helical tube portions on the outer peripheral side. If both the pair of headers for incoming and outgoing hot water are configured as described above, it is optimal for increasing the water flow rate of the water pipe having the helical tube portion on the outer peripheral side, but only one of them is Even if it is a case where it is set as above-mentioned, it is possible to increase the amount of water flow of the water pipe which has the helical tube part on the outer peripheral side. As described above, in the present invention, since the amount of water passing through the water pipe having the outer peripheral spiral tube portion having a large heat transfer area can be increased, the amount of heat recovered by the portion is increased, and the heat exchange efficiency is increased. Can be increased as compared with the prior art.

  In a preferred embodiment of the present invention, when water is passed through the plurality of water pipes using the pair of headers, the water flow quantity of the second water pipe is larger than the water flow quantity of the first water pipe. It is configured to increase.

  According to such a configuration, it is possible to increase the amount of heat recovered by the outermost spiral tubular body portion having the largest heat transfer area, which is more suitable for increasing the heat exchange efficiency.

  In a preferred embodiment of the present invention, the plurality of helical tube portions have a plurality of loop portions connected in series, and the plurality of loop portions are accommodated in the case in a posture aligned in a vertical direction. The case sandwiches the plurality of spiral tube portions in a predetermined front-rear direction with an upper wall portion and a lower wall portion located above and below the plurality of spiral tube portions, and A rear wall portion and a front wall portion in which a heating fluid introduction port and a discharge port are formed, and when the heating fluid is introduced into the case from the introduction port, The fluid is configured to pass through gaps between a plurality of loop portions of the plurality of spiral tubular body portions and reach the discharge port.

  According to such a configuration, the heating fluid flows into the case from the introduction port, passes through the gaps between the plurality of loop portions of each spiral tubular body portion, and is then discharged from the discharge port to the outside of the case. . In such a process, the heating fluid can be efficiently applied to each part of the plurality of helical tube portions, which is suitable for achieving high heat exchange efficiency.

  In a preferred embodiment of the present invention, the case has a substantially rectangular parallelepiped shape, and among the plurality of spiral tube portions, at least each loop portion of the outermost spiral tube portion is in the front-rear direction. A pair of first straight pipe portions extending in the width direction intersecting with each other at an interval, and a pair of second straight pipe portions extending in the front-rear direction at an interval in the width direction. The first and second straight pipe portions are connected to each other through curved pipe portions at or near the four corner portions in the case.

  According to such a configuration, it is possible to prevent a wasteful space space that causes a decrease in heat exchange efficiency from being generated in a large volume in the vicinity of the four corners in the substantially rectangular parallelepiped case. In addition, in a limited space in the case, the dimension of the spiral tube body can be increased to increase the heat transfer area. Therefore, it becomes more suitable for improving the heat exchange efficiency.

  The hot water device provided by the second aspect of the present invention introduces the heat exchanger provided by the first aspect of the present invention and the combustion gas as the heating fluid into the case of the heat exchanger. And a combustor.

  According to such a configuration, the same effect as described for the heat exchanger provided by the first aspect of the present invention can be obtained.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  FIGS. 1-6 has shown an example of the hot water supply apparatus as a specific example of the hot water apparatus with which this invention was applied, and a structure relevant to this. As clearly shown in FIG. 1, the hot water supply apparatus A of the present embodiment includes a combustor 3, a primary heat exchanger 1, and a secondary heat exchanger B. The secondary heat exchanger B corresponds to an example of a heat exchanger to which the present invention is applied.

  The combustor 3 is, for example, a positive combustion gas burner, and is arranged in the can 30 and is configured such that fuel gas is supplied from the outside through a pipe 32. In the can 30, combustion air is blown upward from a blower fan 31 below. The primary heat exchanger 1 is for recovering sensible heat from the combustion gas generated and raised by the combustor 3, and has a structure in which a water pipe 11 having a plurality of fins 12 is arranged in the can body 10. Have.

  The secondary heat exchanger B is for recovering latent heat from the combustion gas, and is disposed above the primary heat exchanger 1 and connected to the can body 10 via the auxiliary can body 19. ing. The secondary heat exchanger B includes a case 7 into which combustion gas is introduced, a plurality of (for example, a total of five) water pipes P, and headers 6A and 6B for entering and discharging hot water. As clearly shown in FIG. 4, each of the plurality of water pipes P has a spiral tubular body portion 5 accommodated in the case 7. The sizes of the plurality of spiral tubular body portions 5 are different, and the spiral tubular body portions 5 having a larger size are sequentially surrounded by the spiral tubular body portions 5 having a smaller size so that they are substantially concentric. It is made into the shape of multiple rolls.

  The case 7 has a hollow, substantially rectangular parallelepiped shape, and sandwiches the plurality of spiral tubular body portions 5 in the horizontal front-rear direction with the upper wall portion 70c and the bottom wall portion 70d sandwiching the plurality of spiral tubular body portions 5 in the vertical direction. It has a rear wall portion 70a and a front wall portion 70b. As clearly shown in FIG. 3, the rear wall portion 70a and the front wall portion 70b are provided with an inlet 71 and an outlet 72 for combustion gas. The discharge port 72 has a substantially rectangular shape as shown in FIG. 2, for example, and the introduction port 71 is the same as that. The combustion gas that has passed through the primary heat exchanger 1 and has traveled upward passes through the auxiliary can 19, enters the case 7 through the inlet 71, and latent heat is generated by the plurality of helical tube portions 5. It has come to be collected. The combustion gas that has finished the latent heat recovery is thereafter discharged from the discharge port 72 to the outside of the case 7. When the latent heat is recovered from the combustion gas, condensed water is generated on the surfaces of the plurality of spiral tubular body portions 5. In contrast, the bottom wall portion 70d of the case 7 is provided with a discharge port 73 for condensed water, and when condensed water drops from the surface of the spiral tubular body portion 5 onto the bottom wall portion 70d of the case 7. Thereafter, the condensed water is discharged from the discharge port 73 to the outside of the case 7.

  Fig. 5 shows a configuration of a water pipe P having an outermost spiral tubular body portion 5 (5 ") as one of a plurality of water pipes P. This water pipe P is composed of, for example, one raw material and A plurality of loop portions 50 that are spirally connected to each other in the vertical direction via a gap 59, and an extended tube portion connected to the lower and upper portions thereof. Each loop portion 50 has a substantially oval shape in plan view, and the intermediate portion S1 in the width direction has a pair of straight pipe portions 50a extending substantially parallel to the width direction of the case 7. Both end portions S2a and S2b in the width direction are formed by a pair of curved tube portions 50c and 50d having a semicircular arc shape in plan view connecting the ends of the straight tube portions 50a and 50b. The straight pipe portions 50a and 50b are horizontal pipes having no inclination with respect to the horizontal plane. In contrast, the pair of curved pipe portions 50c and 50d are inclined pipe body portions that are inclined with respect to a horizontal plane, more specifically, in FIG. Is inclined at an appropriate angle so that the height gradually decreases in the direction of arrow N1 from one end of the straight pipe portion 50a toward one end of the straight pipe portion 50b. The curved pipe portion 50d is higher in height in the direction of arrow N2 from the other end of the straight pipe portion 50b toward the other end of the straight pipe portion 50a of the next-stage loop portion 50. Each of the plurality of loop portions 50 includes straight pipe portions 50a and 50b and curved pipe portions 50c and 50d configured as described above. Each of the water pipes P has the above-described configuration, provided that it has already been described. In addition, the spiral tubular body portions 5 of the plurality of water tubes P are arranged in an overlapping manner, and the sizes of the loop portions 50 are different.

  As shown well in FIG. 4, the portions near one end of each of the plurality of extending pipe portions 51 and 52 penetrate the side wall 70 e of the case 7 and are drawn out of the case 7. The headers 6A and 6B for incoming and outgoing hot water are connected to the portion. If the header 6A for entering water is connected to the lower end side of the water pipe P and water is passed upward from the lower side of the water pipe P, the air in the spiral tubular body portion 5 is moved upward to facilitate air bleeding. Advantages that can be achieved are obtained. A bent portion 51 a that is curved downward is formed outside the case 7 in the extended tube portion 51. The bent portion 51a is a portion for facilitating drainage from each water pipe P. That is, for example, when the operation of the hot water supply device A is stopped for a long period of time in the cold season, the internal water may be drained for the purpose of preventing freezing in the water pipe P. When the water pipe P is constituted by a thin pipe, when performing the above-described drainage, a water film due to the surface tension of the water is generated in the end opening 53 on the lower end side of the water pipe P, and it may be difficult to drain the water. There is. On the other hand, if the above-described bending portion 51a is provided, it becomes possible to break down the above-described water film by utilizing the water head pressure of water existing therein, and to facilitate draining. . The bending part 51a is comprised, for example using the bend pipe | tube. On the other hand, the extended tube part 52 is formed in a straight tube shape without the bent part 51a.

  As shown in FIGS. 6A and 6B, the incoming water header 6A is configured by joining first and second members 60a and 60b formed separately from each other. End portions 5a of the plurality of water pipes P (corresponding to one end portion of the extended pipe body portion 51) are connected to the first member 60a. The second member 60b is provided with an opening 61a for receiving water, and a pipe joint 60c is connected to this portion. Inside the first and second members 60a and 60b, a chamber 62 communicating with the end openings 53 of the plurality of water pipes P and the water inlet openings 61a is formed. The plurality of end openings 53 are arranged in a line at an appropriate interval in the longitudinal direction of the header 6A, and the arrangement order thereof is the same as the order of the lengths of the helical tube portions 5 of the plurality of water pipes P. It has become compatible. That is, while the end opening 53 (53 ′) of the water pipe P having the innermost spiral tubular body 5 (5 ′) shown in FIG. 4A is located near one end of the header 6A, The end opening 53 (53 ") of the water pipe P having the outermost spiral tubular body part 5 (5") is located closer to the other end of the header 6A, and becomes closer to the other end from the one end of the header 6A. The length of the helical tube portion 5 of the water pipe P connected to the position is sequentially increased. The plurality of end openings 53 are opened downward. On the other hand, the opening 61a for water entry is formed in the wall part which faces the some edge part opening 53 among the 2nd members 60b, and is opened upwards. Further, the opening 61a is disposed closer to the end opening 53 (53 ") than the end opening 53 (53 '). Preferably, the opening 61a is arranged to be the end opening 53 (53). At least a part thereof directly faces the whole or a part of the end opening 53 (53 ") without facing the end opening 53 of the so-called inner peripheral water pipe adjacent to ').

  As shown in FIGS. 6A and 6C, the header 6B for hot water is different from the header 6A for water entry described above, but the first and second chambers 62 are formed inside. Members 60a and 60b, and the basic configuration is the same as the header 6A for incoming water. The first member 60a is connected to the ends 5b of the plurality of water pipes P (corresponding to one end of the extended pipe body portion 52), and the second member 60b is connected to the pipe joint 60c. An opening 61b for hot water is provided. The end openings 54 of the plurality of water pipes P are arranged in the longitudinal direction of the header 6B in an order corresponding to the length of the spiral tubular body part 5, and they are open in the horizontal direction. On the other hand, the opening 61b for hot water is formed in the wall facing the plurality of end openings 54 and opens in the horizontal direction. In addition, the opening 61b, like the above-described opening 61a for entering water, is farthest from the end opening 54 (54 ') of the water pipe P having the innermost spiral tubular portion 5 (5'). It is close to the end opening 54 (54 ") of the water pipe P having the outer helical tube part 5 (5"). Preferably, the opening 61b does not face the end opening 54 (54 ′) or the end opening 54 of the so-called inner peripheral water pipe adjacent to the end opening 54 (54 ′). 54 ") directly or entirely.

  As shown in FIG. 1, a water intake pipe 80 for supplying tap water or the like is connected to the pipe joint 60c of the header 6A. On the other hand, the pipe joint 60 c of the header 6 </ b> B is connected to the water inlet 11 a of the primary heat exchanger 1 through the pipe 81. The primary heat exchanger 1 is configured such that the hot water sent from the secondary heat exchanger B passes through the water pipe 11 and is further heated, and the hot water generated in this way is discharged. The hot water is discharged from the gate 11b. However, the order of water flow with respect to the primary and secondary heat exchangers is not limited. For example, the primary heat exchanger 1 is first filled with water, and the hot water passing through the primary heat exchanger 1 is then subjected to secondary heat. It can also be set as the structure supplied to the exchanger B.

  Next, the effect | action of the secondary heat exchanger B and the hot water supply apparatus A provided with this is demonstrated.

  In FIG. 1, the hot water supply apparatus A is combusted when water supplied from the inlet pipe 80 to the header 6A flows through the plurality of water pipes P of the secondary heat exchanger B and the water pipe 11 of the primary heat exchanger 1. The device 3 starts driving. Then, sensible heat and latent heat are sequentially recovered by the primary heat exchanger 1 and the secondary heat exchanger B from the combustion gas generated by the combustor 3. The water flowing through the plurality of water pipes P and the water pipe 11 is heated by such heat recovery, and the hot water generated by this heating is supplied from the hot water outlet 11b to a desired hot water supply destination.

  Each of the plurality of water pipes P has different overall length dimensions, and the internal flow path resistance is the smallest in the water pipe P having the innermost spiral tube body portion 5 (5 ′), and the outermost spiral shape. The water pipe P having the tubular body portion 5 (5 ″) is the largest. Therefore, as explained in the background art section, the passage of the innermost spiral tubular body portion 5 (5 ′) is supposed to be the original. A phenomenon is likely to occur in which the amount of water becomes the largest and the amount of water passing through the outermost spiral tubular body portion 5 (5 ") decreases. On the other hand, in this embodiment, as described with reference to FIG. 6, the opening 61a for entering the header 6A has an end opening corresponding to the outermost spiral tubular body 5 (5 "). 53 (53 ") is closer than the end opening 53 (53 ') corresponding to the innermost spiral tube portion 5 (5'), and the distance between them is very short. . Moreover, the opening 61a for entering water faces the end opening 53 (53 "), and these are in a directly facing state or a state close thereto. Therefore, from the opening 61a for entering water. Much of the water that has flowed into the chamber 62 easily flows into the end opening 53 as it is, and the amount of inflow increases, and not only the outermost periphery but also the second outermost spiral such as the outermost periphery. The water flow rate of the water pipe P having the tubular body part 5 also increases.

  The header 6B is the same as the header 6A described above, and the hot water that has passed through the water pipe P having the outermost spiral tubular body portion 5 (5 ") is discharged from the end opening 54 (54"). It becomes easy to flow out to the part 61b. Similarly, the outflow of hot water from the end opening 54 of the water pipe P having the spiral tube body portion 5 on the other outer peripheral side such as the second outermost periphery to the hot water opening 61b is also promoted. Thus, if the outflow of the hot water from the water pipe P which has the helical tube part 5 of the outer peripheral side to the opening part 61b is accelerated | stimulated, the effect which the water flow amount of those inside increases further will be acquired. Accordingly, in the secondary heat exchanger B, the water flow rate of the spiral tube body part 5 on the outer peripheral side can be made larger than the water flow rate of the spiral tube part 5 on the inner peripheral side. In this case, it is possible to make the water flow rate of the outermost spiral tube part 5 (5 ″) larger than the water flow rate of the innermost spiral tube part 5 (5 ′). In addition, in the present embodiment, by increasing the water flow rate of the water pipe P having the outer circumferential spiral tubular body portion 5 having a large heat transfer area, the heat recovery amount in the portion is increased and the heat exchange efficiency is increased. Moreover, in this embodiment, it is comprised so that internal water flow volume may increase one by one, so that the some water pipe P of the secondary heat exchanger B becomes the thing of the outermost periphery from the innermost periphery. It is possible to further increase the heat exchange efficiency by adopting a simple configuration.

  As described with reference to FIG. 5, in each of the loop portions 50 of the water pipe P, only both end portions S2a and S2b in the width direction are inclined with respect to the horizontal plane, and the intermediate portion S1 in the width direction is horizontal. For this reason, unlike this embodiment, for example, compared with the case where all the portions of the loop portion 50 are inclined with respect to the horizontal plane, the width of the loop portion 50 in the vertical direction is reduced, and the spiral tubular body portion 5 The winding pitch p2 (the arrangement pitch of the loop portions 50) can also be reduced. As a result, even when the number of stages of the loop portion 50 is increased to increase the amount of heat recovery, the overall height dimension of the spiral tubular body portion 5 is not so increased, and the overall size is appropriately suppressed. It is possible. In particular, in the present embodiment, the loop portion 50 has a substantially oval shape in plan view, and the length of the straight tube portions 50a and 50b of the intermediate portion S1 in the width direction is increased to increase the height of the spiral tube portion 5. The heat transfer area of the spiral tubular body portion 5 can be increased without causing an increase.

  In the secondary heat exchanger B, heat recovery is performed when the combustion gas passes through a plurality of gaps 59 formed between the plurality of loop portions 50. On the other hand, the plurality of loop portions 50 arranged in the vertical direction have substantially the same shape, and the width of each portion in the longitudinal direction of the plurality of gaps 59 (the width indicated by the symbol L3 in FIG. 5B). ) Can be evenly aligned. According to such a configuration, it is avoided that the combustion gas flows in a specific location due to the non-uniformity of the width of the gap 59, and the combustion gas is substantially not supplied to each portion of each loop portion 50. It can act uniformly. Therefore, it is more suitable to increase the heat recovery amount.

  7 to 12 show other embodiments of the present invention. In these drawings, elements that are the same as or similar to those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the embodiment shown in FIG. 7, the incoming water header 6A is the same as that of the above embodiment, but the tapping header 9A is configured differently from the header 6B of the above embodiment. The hot water header 9A has a cylindrical portion 90 in which the ends 5b of the plurality of water pipes P are connected to the peripheral wall portion, and an opening portion for the hot water is provided at one end in the axial length direction of the cylindrical portion 90. 91 is formed. The hot water opening 91 opens toward the front of the case 7 so that piping connection to this portion can be easily performed from the front side of the case 7. For this reason, the hot water opening 91 is located closer to the end opening 54 (54 ′) of the water pipe P having the innermost spiral tube 5 (5 ′).

  In the present embodiment, the header 9A for hot water does not have the configuration of the header intended by the present invention, and depending on only the header 9A, the amount of water passing through the spiral tubular body portion 5 on the outer peripheral side is increased. It is difficult to get. However, the hot water header 9A does not significantly increase the amount of water flow through the spiral tubular body portion 5 on the inner peripheral side. On the other hand, according to the header 6A for incoming water, as described in the above embodiment, the supplied water has the end opening 53 (53 "of the water pipe P having the outermost spiral tubular body 5 (5"). ) Or the vicinity of the end opening 53 in the vicinity thereof. For this reason, even in the configuration in which the headers 6A and 9A are combined, it is possible to increase the amount of water passing through the spiral tubular body portion 5 on the outer peripheral side as compared with the prior art. Further, unlike the configuration shown in FIG. 7, the same effect can be obtained when the opening 91 of the header 9 </ b> A for hot water is formed at the other end of the cylindrical portion 90.

  In the embodiment shown in FIG. 8, the header 6B for hot water is the same as that of the embodiment shown in FIGS. 1 to 6, whereas the header 9B for incoming water is the embodiment shown in FIGS. The configuration is different from that of the header 6A. The header 9B has the same configuration as the header 9A shown in FIG. 7, and includes a cylindrical portion 90 to which the end portions 5a of the plurality of water pipes P are connected. An opening 91 for entering water facing the front is formed.

  In the present embodiment, although it is not possible to expect the effect of increasing the amount of water passing through the outer spiral side tubular body portion 5 depending on the incoming header 9B, the outer peripheral side spiral is caused by the action of the tapping header 6B. The flow of water through the tubular body portion 5 is promoted, and the effect of increasing the flow rate can be obtained. Unlike the configuration shown in FIG. 8, the same applies to the case where the opening 91 of the incoming water header 9 </ b> B is formed at the other end of the tubular portion 90.

  As can be understood from these embodiments, in the present invention, at least one of a pair of inlet and outlet headers provided at both ends of a plurality of water pipes is a header having a structure intended by the present invention. It only has to be configured.

  The hot water supply device Aa shown in FIGS. 9 to 11 includes two hot water heating systems capable of heating hot water independently of each other, and includes combustors 3A and 3B, primary heat exchangers 1A and 1B, and a can body 10A. , 10B. The basic configuration of these devices is the same as that of the embodiment shown in FIGS. The secondary heat exchanger Ba has a configuration in which upper and lower heat exchanging units UH and LH are provided in one case 7. These upper and lower heat exchanging parts UH and LH are configured by vertically arranging a plurality of spiral tubular body parts 5 that are substantially concentric and wound around a plurality of water pipes P. It is partitioned by a partition plate 79. As shown in FIG. 11, two introduction ports 71A and 71B for combustion gas are formed in the rear wall portion 70a of the case 7, and the combustion gas that has passed through the primary heat exchangers 1A and 1B, respectively, These are individually guided by the auxiliary can bodies 19A and 19B and individually flow into the upper and lower portions of the case 7 from the inlets 71A and 71B. However, the discharge port 72 provided in the front wall 70b of the case 7 is shared, and the combustion gas that has passed through any of the upper and lower heat exchange units UH and LH is discharged from one discharge port 72 to the outside. It is like that.

  For example, a pair of headers 9B and 6B similar to those shown in FIG. 8 are connected to both ends of the plurality of water pipes P constituting the upper heat exchange unit UH, and a water inlet pipe is connected to the header 9B. The header 6B is connected by piping to the water inlet 11a of the primary heat exchanger 1A. For example, a pair of headers 6A and 9A similar to those shown in FIG. 7 are connected to both ends of the plurality of water pipes P constituting the lower heat exchange section LH, and a water inlet pipe is connected to the header 6A. The header 9A is connected by piping to the water inlet 11a ′ of the primary heat exchanger 1B. In addition, as a header of the secondary heat exchanger Ba, unlike this embodiment, for example, the headers 6A and 6B can be used in combination as in the embodiment shown in FIGS.

  In the hot water supply apparatus Aa of the present embodiment, sensible heat and latent heat recovery are performed from the combustion gas generated by the combustor 3A using the heat exchange unit UH at the top of the primary heat exchanger 1A and the secondary heat exchanger Ba. Made. Hot and cold water generated by this process is supplied to the outside from the outlet 11b of the primary heat exchanger 1A. On the other hand, sensible heat and latent heat are recovered from the combustion gas generated by the combustor 3B by using the heat exchanger LH below the primary heat exchanger 1B and the secondary heat exchanger Ba. And the hot water heated and generated by this process is supplied to the outside from the outlet 11b ′ of the primary heat exchanger 1B. When the hot water heating system including the combustor 3A is made relatively small and the hot water heating system including the combustor 3B is made larger than that, for example, the former hot water heating system is fixed with hot water for floor heating (including antifreeze). It is suitable for generating hot water for so-called general hot water supply that is used for the purpose of heating while being circulated through this route, and the latter hot water heating system is supplied to a kitchen or a washroom. Thus, according to the hot water supply device Aa of the present embodiment, it is possible to independently and appropriately generate hot water for two uses, and the functionality is excellent. Since the secondary heat exchanger Ba has a configuration in which two heat exchange portions UH and LH are incorporated in one case 7, the configuration is reasonable and the size can be reduced. preferable. Of course, when water is passed through the water pipes P of the two heat exchange parts UH and LH of the secondary heat exchanger Ba, similarly to the above-described embodiment, the helical tube body part on the outer peripheral side is used. The water flow rate of the water pipe P having 5 can be increased, and the heat exchange efficiency can be increased. As can be understood from the present embodiment, the heat exchanger to which the present invention is applied may have a configuration in which a plurality of groups of spiral tube portions formed in an overlapping manner are provided.

  In the embodiment shown in FIG. 12, with respect to the loop portion 50 of the innermost spiral tube body portion 5, both end portions S2a and S2b in the width direction are semicircular arc-shaped bent tube portions, as in the above embodiment. Has been. However, the loop portion 50A of the other helical tube portion 5 closer to the outer periphery than that is entirely rectangular in plan view, and both end portions S2a, S2b in the width direction extend in the front-rear direction of the case 7. It has straight pipe portions 50c 'and 50d'. The straight pipe portions 50c ′, 50d ′ and the straight pipe portions 50a, 50b of the intermediate portion S1 in the width direction are connected via a plurality of curved pipe portions 50R (however, the side in the width direction end portion S2b is bent). The pipe portion 50R is hidden under the water pipe P, and the reference numeral is omitted). The plurality of curved pipe portions 50R are located at or near the four corner portions 78 in the case 7, and preferably, the curvature radii thereof are made the same to make the bending of the pipe constant. .

  According to the present embodiment, since a part of the water pipe P is disposed at the four corner portions 78 of the case 7 or in the vicinity thereof, the dead space in the case 7 can be reduced. Further, according to the configuration in which the straight pipe portions 50c ′ and 50d ′ are provided at both ends S2a and S2b in the width direction of the loop portion 50, the loop portion is formed rather than the case where the both ends S2a and S2b are formed in a simple semicircular arc shape. The length of 50 becomes longer, and the heat transfer area of the spiral tubular body portion 5 also becomes larger. Therefore, it is suitable for further increasing the heat exchange efficiency. In the present invention, each loop portion of the spiral tubular body portion may be formed in another shape such as a substantially square shape or a substantially circular shape, and its specific shape is not limited.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the heat exchanger and the hot water apparatus according to the present invention can be varied in design in various ways.

  In the present invention, it is preferable that at least a part of the inlet or outlet opening of the header is directly opposed to the end opening of the water pipe having the outermost spiral tubular body, but the present invention is not limited to this.

  There may be a plurality of water tubes, and the specific number is not limited. Although it is preferable that each loop part of the spiral tube part is configured such that the intermediate part in the width direction is horizontal and the both end parts in the width direction are inclined, it is not limited to this. The entire loop portion may be inclined.

  In the embodiment described above, the present invention is not applied to the primary heat exchanger for sensible heat recovery, but the heat exchanger according to the present invention may be of any type for sensible heat recovery and latent heat recovery. . The heat exchanger according to the present invention can also be used for sensible heat recovery.

  In the hot water apparatus according to the present invention, a combustor other than a gas burner may be used, and for example, an oil burner may be used. Also, the method of causing the combustion gas to flow into the heat exchanger case and acting on the water pipe can be made different from the above-described embodiment, for example, introduced into the inside of the spiral tubular body portion. It is also possible to adopt a method in which the combustion gas passes through the gaps of the plurality of loop portions and flows out to the outer periphery of the helical tube portion. The hot water device as used in the present invention means a device having a function of generating hot water, and is used for various types of hot water supply devices for general hot water supply, bath hot water supply, heating, snow melting, and the like, and hot water supply. It is a concept that includes a wide range of equipment for producing hot water.

It is a schematic front sectional view showing an example of a hot water supply device as a hot water device to which the present invention is applied. It is a principal part front view of the hot-water supply apparatus shown in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. (a) is a plane sectional view of the secondary heat exchanger of the hot-water supply apparatus shown in FIG. 1, and (b) is a front sectional view thereof. (a) is a top view which shows an example of the water pipe of the secondary heat exchanger shown in FIG. 4, (b) is VV sectional drawing of (a). (A) is a principal part side view of the hot-water supply apparatus shown in FIG. 1, (b) is principal part sectional drawing of (a), (c) is VI-VI sectional drawing of (a). is there. (a) is a principal part plane sectional view showing other examples of a heat exchanger to which the present invention was applied, and (b) is the principal part section side view. (a) is a principal part plane sectional view showing other examples of a heat exchanger to which the present invention was applied, and (b) is the principal part section side view. It is a schematic front sectional drawing which shows the other example of the hot water apparatus to which this invention was applied. It is a schematic front view of the hot water device shown in FIG. FIG. 10 is a schematic side cross-sectional view of the hot water device shown in FIG. 9. It is principal part plane sectional drawing which shows the other example of the heat exchanger to which this invention was applied.

Explanation of symbols

A, Aa Hot water supply device (hot water device)
B, Ba Secondary heat exchanger P Water tube 3, 3A, 3B Combustor 5 Spiral tube portion 6A, 6B Header 7 Case 50 Loop portion (of spiral tube portion)
53, 54 End opening (water pipe)
61a Opening for incoming water 61b Opening for hot water 62 Chamber (for header)
70a Rear wall (case)
70b Front wall (case)
70c Upper wall (case)
70d Bottom wall (of the case)
71 Inlet (for combustion gas)
72 outlet (for combustion gas)

Claims (5)

A case where a heating fluid to be heat exchanged is introduced inside;
A plurality of water pipes having a plurality of spiral tubular body parts accommodated in the case, and the plurality of spiral tubular body parts being arranged in a substantially concentric overlapping winding;
A pair of chambers connected to both ends of the plurality of water pipes and having a chamber communicating with the end openings of the plurality of water pipes, and a water inlet or outlet opening communicating with the chambers. And the header
A heat exchanger comprising:
At least one of the pair of headers has an opening for water entry or hot water that has an outermost spiral tube body portion than an end opening of the first water tube having an innermost spiral tube portion. A heat exchanger, wherein the heat exchanger is formed in a wall portion that approaches the end opening of the second water pipe and faces the end opening of the second water pipe in the header.   The water flow rate of the second water pipe is configured to be larger than the water flow rate of the first water pipe when water is passed through the plurality of water pipes using the pair of headers. Item 2. The heat exchanger according to Item 1. The plurality of helical tube portions have a plurality of loop portions connected in series, and the plurality of loop portions are accommodated in the case in a posture aligned in a vertical direction,
The case includes an upper wall portion and a lower wall portion located above and below the plurality of spiral tube portions, and sandwiches the plurality of spiral tube portions in a predetermined front-rear direction. A rear wall portion and a front wall portion in which an introduction port and a discharge port are formed,
When the heating fluid is introduced into the case from the introduction port, the heating fluid passes through gaps between a plurality of loop portions of the plurality of spiral tubular body portions and reaches the discharge port. The heat exchanger according to claim 1 or 2, wherein the heat exchanger is configured as described above. The case has a substantially rectangular parallelepiped shape,
Among the plurality of spiral tube portions, at least each loop portion of the outermost spiral tube portion is a pair of first straight tube portions extending in the width direction intersecting with the space in the front-rear direction. And a pair of second straight pipe portions extending in the front-rear direction with an interval in the width direction, and the first and second straight pipe portions are arranged at four corners in the case or the The heat exchanger according to claim 3, wherein the heat exchanger is connected via a bent pipe portion in the vicinity.   A hot water comprising: the heat exchanger according to any one of claims 1 to 4; and a combustor for introducing combustion gas as the heating fluid into a case of the heat exchanger. apparatus.

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