JP5835569B2 - Heat exchanger and hot water device provided with the same - Google Patents

Description

  The present invention relates to a heat exchanger configured to recover heat from a heating gas such as a combustion gas by using a fin tube type heat transfer tube, and a hot water apparatus such as a hot water supply apparatus provided with the heat exchanger.

  As a heat exchanger used in a hot water device such as a gas hot water supply device, a heat transfer tube is passed through a large number of plate-like fins arranged at intervals, and the periphery of the heat transfer tube and fins is formed by a can body. The enclosed structure is often used. In a heat exchanger having such a structure, heat transfer tubes are often provided in a plurality of stages above and below as means for increasing the amount of heat recovery. However, according to such a means, the size of the heat exchanger in the vertical height direction is increased. Therefore, conventionally, there is means for forming the heat transfer tubes in a meandering manner and providing the heat transfer tubes in a single stage (one stage) at the vertical height of the can body (see, for example, Patent Document 1). According to such a configuration, there is an advantage that the vertical height dimension of the entire heat exchanger can be reduced and the manufacturing cost can be reduced.

  However, as described above, when the heat transfer tube is made to be a single stage, there is a possibility of causing the following problems.

That is, in the case where the heat transfer tube is formed in a meandering shape and is provided in a single stage, when one end of the heat transfer tube is used as a water inlet and the other end is used as a hot water outlet, water is passed through the heat transfer tube. The direction is one direction. In such a state where water is unidirectionally passed, for example, when the heat transfer tube is heated by burning the burner disposed below the heat transfer tube, the heat transfer tube close region and the hot water discharge port close region A large temperature difference is generated. Specifically, the region close to the water inlet of the heat transfer tube has just been supplied with relatively low-temperature water, and this water is not sufficiently heated by the burner, so it becomes a low-temperature region. On the other hand, the hot water outlet region is a high temperature region because hot water sufficiently heated by the burner circulates over a period from the water inlet to the hot water outlet.
When such a phenomenon occurs, the water vapor in the combustion gas condenses in the region near the water inlet, which is a low temperature region, and a strongly acidic drain (condensation) containing sulfur oxides or nitrogen oxides in the combustion gas. Water) is likely to occur. When a strongly acidic drain is generated, the heat transfer tubes and fins are likely to corrode when they are made of, for example, copper which does not have acid resistance. On the other hand, in the region near the hot water outlet, which is a high temperature region, there is a concern that the hot water flowing through the heat transfer tube will boil in an overheated state and cause high temperature oxidation of the heat transfer tube. Therefore, it is desirable to appropriately prevent or suppress these phenomena.

Japanese Utility Model Publication No. 3-18874

  The present invention has been conceived under the circumstances as described above, and in the case where a heat transfer tube is made into a single stage to reduce the overall thickness, a drain is generated in a region on the water inlet side, Providing a heat exchanger capable of appropriately preventing or suppressing boiling of hot water flowing through the heat transfer tube in the region on the side, and a hot water device including the heat exchanger, It is an 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 heat transfer tube having a plurality of straight tube portions penetrating through a plurality of plate-like fins, the plurality of straight tube portions, and the plurality of tube portions. A can body having a plurality of side wall portions surrounding the periphery of the fins and having both upper and lower side portions as openings for the inflow and outflow of the heating gas, and the heat transfer tube has the plurality of straight shapes The meandering in which the tube portions are arranged at intervals in the front-rear or left-right width direction of the can body and are provided in a single stage in the vertical height direction of the can body and connected in series via the connecting tube portion Of the two straight tube portions located at both ends in the width direction of the heat transfer tube, one is a water inlet side tube portion, and the other is a hot water side tube portion, Distribution of hot water in the heat transfer pipe is made in one direction from the water inlet side pipe body part toward the hot water outlet side pipe body part. It is a heat exchanger comprised in this way, Comprising: The width | variety of the clearance gap between the said inflow side pipe body part and the 1st side wall part of the said can body which opposes and approaches this is the said hot water side pipe body part and this It is characterized by being larger than the width of the gap with the second side wall portion of the can body facing and approaching.
Here, the side wall portions (first side wall portion, second side wall portion) of the can body are configured by using a member separate from the main member of the can body (for example, a partition member 3 in an embodiment described later). This is a concept including the side wall portion.

  According to such a configuration, while increasing the flow rate of the heating gas passing through the gap between the water inlet side tube portion of the heat transfer tube and the first side wall portion of the can body, the outlet side tube portion and the can body The flow rate of the heating gas passing through the gap with the second side wall portion can be reduced. For this reason, even when low-temperature hot water is poured into the heat transfer pipe, the amount of heat applied to the water inlet side pipe body part and the vicinity thereof can be increased, and the temperature of these parts can be increased. It is possible to prevent or suppress the occurrence. Therefore, the trouble that the heat transfer tubes and the fins are easily corroded due to the drain can be avoided. On the other hand, about the outlet side tube portion of the heat transfer tube and the vicinity thereof, the amount of heating by the heating gas can be reduced, so that the hot water flowing through the heat transfer tube is boiled in an overheated state, It is possible to appropriately prevent or suppress the heat transfer tube from being oxidized at high temperature.

The heat exchanger provided by the second aspect of the present invention includes a heat transfer tube having a plurality of straight tube portions penetrating through a plurality of plate-shaped fins, the plurality of straight tube portions, and the plurality of tube portions. A can body having a side wall portion surrounding the periphery of the fin and having both upper and lower surface portions as openings for inflow and outflow of heating gas, and the heat transfer tube includes the plurality of straight tube bodies Are arranged in a row in the width direction of the front and rear or left and right of the can body, and are provided in a single stage in the vertical height direction of the can body and connected in series through a connecting tube portion. Of the two straight tube portions that are formed at both ends in the width direction of the heat transfer tube, one is a water inlet side tube portion, and the other is a hot water discharge side tube portion. Circulation of hot water in the heat pipe is performed in one direction from the incoming water side pipe part toward the outgoing hot water side pipe part. In the heat exchanger, a part of the surface of each fin protrudes from the plurality of fins so as to provide resistance when the heating gas passes between the plurality of fins. A plurality of heating gas flow restricting portions provided as the plurality of flow restricting portions , or between the hot water side pipe body portion and the second side wall portion of the can body facing and approaching the hot water side pipe body portion; While a flow regulating portion on the most hot water side located above or below is provided, between the inlet side tube body portion and the first side wall portion of the can body facing and approaching the same, and above and below it The position is not provided with a flow restricting portion, or is provided with a flow restricting portion having a smaller resistance to the flow of the heating gas than the flow restricting portion on the outermost hot water side. The peripheral part of the tapping side tube part is more than the peripheral part. Is characterized by being configured so that the resistance to the flow of heat gas increases.

According to such a configuration, based on the fact that the heating gas flow restricting portion is provided in a predetermined biased state in each fan, a large amount of heating gas flows in the peripheral portion of the water inlet side tube portion. It becomes easy and the effect | action which becomes difficult for many heating gas to flow to the peripheral part of the tapping hot water side pipe body part is acquired. Therefore, similarly to the heat exchanger provided by the first aspect of the present invention, the temperature of the water inlet side tube portion of the heat transfer tube and the vicinity thereof are raised to appropriately prevent the drain from being generated in this region. Or it can be suppressed. In addition, the outlet side tube portion of the heat transfer tube and the vicinity thereof are not excessively heated, and it is also possible to appropriately prevent the boiling of hot water flowing through the heat transfer tube and the high temperature oxidation of the heat transfer tube. Can be suppressed.

Furthermore, according to the said structure, it becomes easy to flow a lot of gas for heating between the water inlet side pipe | tube part of a heat exchanger tube, and the 1st side wall part of a can, and the hot water side pipe | tube part and the 1st of a can It is possible to prevent a large amount of heating gas from flowing between the two side walls. Therefore, it is suitable for increasing the temperature of the water inlet side pipe body part and its peripheral part and suppressing the hot water side pipe part and its peripheral part from becoming an excessively high temperature region.

The heat exchanger provided by the third aspect of the present invention includes a heat transfer tube having a plurality of straight tube portions penetrating through a plurality of plate-shaped fins, the plurality of straight tube portions, and the plurality of tube portions. A can body having a side wall portion surrounding the periphery of the fin and having both upper and lower surface portions as openings for inflow and outflow of heating gas, and the heat transfer tube includes the plurality of straight tube bodies Are arranged in a row in the width direction of the front and rear or left and right of the can body, and are provided in a single stage in the vertical height direction of the can body and connected in series through a connecting tube portion. Of the two straight tube portions that are formed at both ends in the width direction of the heat transfer tube, one is a water inlet side tube portion, and the other is a hot water discharge side tube portion. Circulation of hot water in the heat pipe is performed in one direction from the incoming water side pipe part toward the outgoing hot water side pipe part. In the heat exchanger, a part of the surface of each fin protrudes from the plurality of fins so as to provide resistance when the heating gas passes between the plurality of fins. There are a plurality of heating gas flow restricting portions, and the plurality of flow restricting portions include a plurality of flow restricting portions provided between the plurality of straight tube portions. Among the straight tube portions, the flow restricting portion provided in the region between the water inlet side tube portion and the straight tube portion adjacent thereto and in the upper and lower regions thereof is another straight tube body. The resistance to the flow of the heating gas is smaller than that of the flow restricting portion provided between the portions and in the upper and lower regions, and the hot water side of the peripheral portion of the water inlet side tube portion. The resistance to the flow of the heating gas is greater in the peripheral part of the tube part It is characterized by being configured such that.

  According to such a configuration, it is possible to increase the amount of the heating gas flowing between the water inlet side tube portion of the heat transfer tube and the straight tube portion adjacent thereto. Therefore, it is possible to further increase the temperature of the water inlet side pipe body part and the surrounding area, which is more preferable in preventing the generation of drain.

In this invention, it is set as the structure provided with both each characteristic structure of the heat exchanger provided by the 1st side surface, and the heat exchanger provided by the 2nd or 3rd side surface. Is possible.
Specifically, in the heat exchanger provided by the second or third side face, the width of the gap between the water inlet side pipe body part and the first side wall part of the can body facing and approaching the water inlet side pipe part is: It is possible to make it the structure made larger than the width | variety of the clearance gap between the said hot water side pipe body part and the 2nd side wall part of the said can body which opposes and approaches this.

  According to such a configuration, it is more thorough that the water inlet side pipe part and its peripheral part become a low temperature region and a drain is generated, and that the outlet side pipe part and its peripheral part are overheated. Can be prevented.

The hot water apparatus provided by the fourth aspect of the present invention includes the heat exchanger provided by any one of the first to third aspects of the present invention.

According to such a configuration, the same effect as described for the heat exchanger provided by the first to third aspects 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.

It is a schematic front sectional view showing an example of a hot water apparatus provided with a heat exchanger (primary heat exchanger) to which the present invention is applied. It is II-II sectional drawing of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is a plane sectional view of the primary heat exchanger shown in FIG. It is a principal front schematic sectional drawing of the hot water apparatus shown in FIG. (A) is VIa-VIa sectional drawing of FIG. 5, (b) is VIb-VIb sectional drawing of (a). It is VII-VII sectional drawing of FIG. It is a principal part disassembled sectional view which shows the state which attaches a partition member to the primary heat exchanger shown in FIG. It is a top sectional view showing the secondary heat exchanger of the hot water device shown in FIG. It is a schematic front sectional drawing which shows the other example of the hot water apparatus which concerns on this invention.

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

FIGS. 1-9 has shown an example of the hot water apparatus with which this invention was applied, and the structure relevant to this.
As clearly shown in FIG. 1, the hot water device WH1 of the present embodiment includes a burner 5, a primary heat exchanger HE1, a secondary heat exchanger HE2, and an outer case 90 surrounding them. This hot water device WH1 can independently perform two systems of hot water supply, general hot water supply and bath hot water supply or heating hot water supply. The primary heat exchanger HE1 and the secondary heat exchanger HE2 are: Both are one-can two-circuit systems.

  The primary heat exchanger HE1 corresponds to an example of a heat exchanger according to the present invention, and has a configuration in which the first and second heat transfer tubes T1 and T2 having a serpentine shape in plan view are accommodated in one can body 6. It is. The secondary heat exchanger HE2 has a configuration in which a plurality of third and fourth heat transfer tubes T3 and T4 formed in a spiral shape are accommodated in one case 7, and is included in the heat exchanger according to the present invention. Is not equivalent.

  The burner 5 is a gas burner, for example, and burns fuel gas by using combustion air sent upward from the fan 51 into the burner case 50. However, the burner 5 has first and second combustion regions A1 and A2 that can individually control the combustion operation of the fuel. The upper region of the first and second combustion regions A1, A2 is partitioned by a partition member 52, and the combustion gas generated in each of the first and second combustion regions A1, A2 is the first and second transmissions. It progresses individually toward the heat tubes T1 and T2.

  The primary heat exchanger HE1 is for recovering sensible heat from the combustion gas. The can 6 constituting the primary heat exchanger HE1, first and second heat transfer tubes T1 and T2, and a later-described The fins 2A and 2B to be made are both made of copper. The can body 6 of the primary heat exchanger HE1 has a substantially rectangular frame shape in plan view having side wall portions 60a to 60d erected in the vertical direction. However, the concept of the “side wall portion of the can” in the present invention includes a side wall portion 30a of the partition member 3 described later. The upper and lower surfaces of the can 6 are opened in a rectangular shape and correspond to combustion gas inflow / outlet ports. The combustion gas generated by the burner 5 passes through the can 6 upward from below.

As shown in FIG. 4, the first heat transfer tube T1 has a meandering in a plan view in which a plurality of straight tube portions 11a penetrating the fins 2A are connected in series via a substantially U-shaped connecting tube portion 12a. Is. More specifically, the plurality of straight tubular body portions 11 a are oriented in the front-rear direction of the can body 6, arranged in a horizontal direction that is the left-right width direction of the can body 6 at substantially constant intervals, and It is in a state of being provided in a single stage in the vertical direction. Both end portions of each straight tube portion 11a penetrate the side wall portions 60a and 60b of the can body 6 and are joined to the side wall portions 60a and 60b by means such as brazing. The ends of the straight tubular body portions 11a adjacent to each other are connected to each other via a coupling tubular body portion 12a using a U-shaped tube. The second heat transfer tube T2 has a plurality of straight tube portions 11b and connecting tube portions 12b that are provided in a single stage in the vertical height direction through the fins 2B. Similar to the heat transfer tube T1, they are connected in a serpentine shape in plan view and are supported by the side walls 60a and 60b. The first and second heat transfer tubes T <b> 1 and T <b> 2 are aligned at substantially the same height and are arranged in the left-right width direction of the can body 6.

  The water inlets 15a and 15b of the first and second heat transfer tubes T1 and T2 are connected to the straight tube portions 11a and 11b at positions closest to the side walls 60c and 60d of the can body 6 to the joint tubes 12a ′, 12b 'is connected. It should be noted that one end opening of the water inlet side pipe parts 11a 'and 11b' can be used as the water inlet without using the joint pipes 12a 'and 12b' or a member corresponding thereto. This also applies to the next outlets 16a and 16b. The hot water outlets 16a and 16b are one end openings of the straight tube portions 11a and 11b that are closest to the partition member 3 described later. With such a configuration, the hot water supplied to the water inlets 15a and 15b flows in a meandering manner along the first and second heat transfer tubes T1 and T2, but as shown by arrows N1 and N2, It flows in one direction from the position approaching the side walls 60c, 60d of the body 6 toward the partition member 3, and reaches the hot water outlets 16a, 16b. In the present invention, the flowing direction of the hot water may be opposite to the direction.

  The fins 2 </ b> A and 2 </ b> B are for increasing the amount of heat recovered from the combustion gas, and are thin plates extending in the left-right width direction of the can body 6. As shown in FIG. 5, one end portions of the fins 2 </ b> A and 2 </ b> B are joined to the side wall portions 60 c and 60 d of the can 6 using a means such as brazing. On the other hand, as shown in FIG. 8, the other end portions of the fins 2A and 2B are not joined to the can body 6, and a gap 68 formed between them is a partition that partitions the fins 2A and 2B. The member 3 is inserted and mounted. The partition member 3 is formed, for example, by bending a metal plate having excellent heat resistance into a U-shaped cross section or a form similar thereto, and one side edge portion (lower edge portion in the drawing) is connected, And it has a pair of plate-shaped side wall part 30a, 30b which mutually opposes through a clearance gap. The pair of side wall portions 30a and 30b can be bent and deformed with a spring property, whereby the thickness of the partition member 3 can be changed. The partition member 3 is inserted and held in the gap 68 in a compressed state so that the thickness is slightly reduced.

  About 1st heat exchanger tube T1 and fin 2A, it has controlled that the field near straight tube part 11a (incoming side tube part 11a ') facing and approaching side wall part 60c of can 6 becomes a low temperature area. In addition, as means for suppressing the region near the straight tubular body portion 11a (the tapping side tubular body portion 11a ") facing and approaching the side wall portion 30a of the partition member 3 from being overheated, the following means are provided. (Note that the side wall portion 60c of the can 6 corresponds to an example of the first side wall portion referred to in the present invention, and the side wall portion 30a of the partition member 3 corresponds to the second side wall portion referred to in the present invention. The first and second side wall portions referred to in the present invention are not limited to the side wall portions provided in the can body itself, but are members formed separately from the can body, It may be constituted by a member attached directly or indirectly to the body).

  In FIG. 5, the width L1 of the gap C1 between the water inlet side pipe body part 11a ′ and the side wall part 60c is made larger than the width L2 of the gap C2 between the hot water side pipe body part 11a ″ and the side wall part 30a. Thus, as will be described later, the amount of the combustion gas passing through the gap C1 can be increased while the amount of the combustion gas passing through the gap C2 can be reduced. The pitch is constant (provided that the arrangement pitch of the straight tubular portions 11a is gradually increased as the distance from the incoming water tubular portion 11a 'increases, and the fuel passes through the region closer to the incoming water tubular portion 11a'. It may be configured to increase the amount of gas).

  The fins 2 </ b> A are provided with combustion gas flow restricting portions 20 and 21. The flow restricting portions 20 and 21 are portions in which a plurality of portions of the fin 2A are partially protruded, and are essentially for increasing the degree of contact between the fin 2A and the combustion gas to increase the heat recovery amount. However, in the present embodiment, it is also used for controlling the flow rate of the combustion gas. These flow restricting portions 20 and 21 are not provided in a uniform distribution in the width direction of the can body 6, and are located closer to the peripheral portion of the tapping side tubular portion 11 a ″ than the peripheral portion of the water inlet side tubular portion 11 a ′. More specifically, the resistance to the combustion gas flow is increased. More specifically, the flow restricting portion 20 (main) is disposed above the gap C2 between the tapping side tube portion 11a "and the side wall portion 30a. The flow regulating portion on the most hot water side referred to in the invention is provided, whereas the flow regulating portion corresponding to the flow regulating portion 20 is provided above and below the gap C1 between the water inlet side pipe body portion 11a ′ and the side wall portion 60c. There is no section. However, instead of this, it is possible to adopt a configuration in which a flow restricting portion having a size (low resistance) smaller than that of the flow restricting portion 20 is provided in the gap C2 and above or below it. For example, as shown in FIG. 7, the flow restricting portion 20 has a form in which a part of the fin 2 </ b> A is pushed out so as to protrude by an appropriate dimension in front of or behind the fin 2 </ b> A.

  A plurality of flow restricting portions 21 are provided between the adjacent straight tubular body portions 11a and in an upper region thereof. Among these, the flow restricting portion 21 (21a) provided between the water inlet side tube portion 11a ′ and the adjacent straight tube portion 11a and the upper region thereof is more than the other flow restricting portions 21. Also, the resistance to the combustion gas flow is reduced. In this embodiment, the number of the flow control parts 21a is made smaller than the number of the flow control parts 21 provided in another location as a means for that. However, in the present invention, instead of or in addition to this, the sizes of the flow restricting portions 21 and 21a may be different. The flow restricting portion 21 (including 21a) has a form as shown in FIG. 6, for example, and is formed using a cutting and raising method. That is, the flow restricting portion 21 forms two slits substantially parallel to the fin 2A, and then bends the portion sandwiched between the two slits in a U-shaped cross section in front or rear of the fin 2A. It protrudes into

  Although the fin 2B is appropriately provided with a convex portion (flow restricting portion) for increasing the amount of heat recovery, the amount of combustion gas passing to the water inlet side portion of the heat transfer tube T2 is determined as the amount of combustion gas passing through the hot water side portion. No special measures are taken to actively increase the quantity. This is because the heat transfer pipe T2 is used for bath hot water supply or heating hot water supply, and compared with the heat transfer pipe T1, the amount of heating by the burner 5 is small, so that it is difficult for drainage to occur on the incoming water side, and overheating on the outgoing hot water side. This is because the condition is difficult to occur. However, unlike this embodiment, the heat transfer tube T2 also has a similar structure to the heat transfer tube T1 in order to increase the amount of combustion gas passing to the incoming water side portion and to reduce the amount of combustion gas passing to the hot water side portion. Means may be taken.

  In FIG. 1, the secondary heat exchanger HE2 is for recovering latent heat from the combustion gas that has passed through the primary heat exchanger HE1, and is placed in a case 7 mounted on the primary heat exchanger HE1. The plurality of third and fourth heat transfer tubes T3 and T4 are accommodated and the space between them is partitioned via a partition plate 74. The third and fourth heat transfer tubes T3, T4 and the case 7 are made of, for example, stainless steel so as to have corrosion resistance against the strongly acidic drain generated along with the recovery of latent heat. As shown in FIG. 9, the plurality of third heat transfer tubes T <b> 3 are formed as spiral tubes having different sizes and are arranged in an overlapping manner, and their upper and lower ends are arranged outside the case 7. Is connected to headers 75a and 75b for passing water. The plurality of fourth heat transfer tubes T4 are also similar in basic form to the third heat transfer tube T3, and are formed as spiral tubes arranged in an overlapping manner, and at both upper and lower ends thereof, The headers 75c and 75d for water flow are connected.

The case 7 of the secondary heat exchanger HE2 has air supply ports 71a and 71b in the bottom wall portion 70a, and an exhaust port 72 in the front wall portion 70b. As shown in FIG. 2, the first heat exchanger HE1
The combustion gas that has passed through the portion where the heat transfer tube T1 is provided proceeds into the case 7 from the air supply port 71a, passes through the gap between the third heat transfer tubes T3, and is then discharged to the outside from the exhaust port 72. . In addition, as shown in FIG. 3, the combustion gas that has passed through the location where the second heat transfer tube T2 of the primary heat exchanger HE1 is provided proceeds into the case 7 from the air supply port 71b, and the fourth heat transfer. After passing through the gap between the heat pipes T4, it is discharged to the outside from the exhaust port 72. In such a process, latent heat is recovered from the combustion gas by the third and fourth heat transfer tubes T3 and T4. The strongly acidic drain generated by the latent heat recovery flows down from the third and fourth heat transfer tubes T3 and T4 onto the bottom wall portion 70a of the case 7 and then passes through a drain discharge port (not shown). 7 is discharged to the outside.

  As shown in FIG. 1, external water inlets 90 a and 90 b to which water supply pipes 80 a and 80 b are connected and external hot water outlets 92 a and 92 b to which hot water discharge pipes 81 a and 81 b are connected to the bottom or side of the outer case 90. Is provided. The hot water supplied to the external water inlet 90a is supplied to the header 75b via the piping part 92a, thereby circulating in the third heat transfer tube T3 of the secondary heat exchanger HE2. Thereafter, the hot water is sent to the water inlet 15a of the primary heat exchanger HE1 through the header 75a and the piping portion 93a, and passes through the first heat transfer tube T1. The hot water that has passed through the first heat transfer tube T1 and has reached the hot water outlet 16a then reaches the external hot water outlet 92a through the piping portion 94a. The hot water reaching the external hot water outlet 92a is supplied to, for example, a kitchen or a washroom.

  On the other hand, the hot water supplied to the external water inlet 90b is supplied to the header 75d via the piping part 92b, thereby circulating in the fourth heat transfer pipe T4 of the secondary heat exchanger HE2. Thereafter, the hot water is sent to the water inlet 15b of the primary heat exchanger HE1 via the header 75c and the piping portion 93b, and passes through the second heat transfer tube T2. The hot water that has passed through the second heat transfer pipe T2 and has reached the hot water outlet 16b then reaches the external hot water outlet 91b through the piping portion 94b, and is supplied to a predetermined location for bath hot water supply or heating hot water supply. .

  Next, the effect | action of above described hot water apparatus WH1 is demonstrated.

  First, the first and second heat transfer tubes T1 and T2 of the primary heat exchanger HE1 have a configuration in which a plurality of straight tube portions 11a and 11b are provided in a single stage (one stage) in the vertical direction. . For this reason, compared with the case where the straight tube parts 11a and 11b are provided in a plurality of upper and lower stages, the primary heat exchanger HE1 is made thinner, the entire hot water device WH1 is downsized, and the manufacturing cost is reduced. Can do.

  When the burner 5 is driven to burn and the combustion gas is advanced toward the primary heat exchanger HE1, a relatively large amount of combustion gas can be supplied to the peripheral portion of the water inlet side pipe portion 11a ′. In addition, it is possible to prevent excessive combustion gas from being supplied to the peripheral portion of the hot water side pipe body portion 11a ". As described above, the widths L1 and L2 of the gaps C1 and C2 are L1>. The fact that there is a relationship of L2 and that the gap C2 is provided with a combustion gas flow restricting portion 20 above it to cause resistance to the combustion gas flow, while the gap C1 has means corresponding to the flow restricting portion 20 It is not provided, and the resistance to the combustion gas flow is reduced, and the plurality of flow restriction portions 21a have a smaller resistance to the combustion gas flow than the other flow restriction portions 21, and the water inlet side pipe body portion. This is also because the combustion gas easily flows between 11a ′ and the straight tubular body portion 11a adjacent thereto.

Although the hot water heated by passing through the heat transfer tube T3 of the secondary heat exchanger HE2 is supplied to the heat transfer tube T1, when the temperature of the water input to the heat transfer tube T3 is considerably low, the water input to the heat transfer tube T1 The temperature is relatively low. On the other hand, as described above, when a relatively large amount of combustion gas is supplied to the peripheral portion of the water inlet side pipe body portion 11a ', even if cold hot water is supplied to the heat transfer pipe T1, the water inlet side It is suppressed appropriately that the peripheral part of tube part 11a 'is maintained at a low-temperature state. As a result, it is possible to prevent a large number of drains from being generated in those portions, and to appropriately suppress a problem that the water inlet side tube portion 11a ′ and the fins 2A are easily corroded due to the drains.

  On the other hand, the temperature of the hot water in the heat transfer tube T1 is the highest in the tapping side tube portion 11a "corresponding to the end of the heat transfer tube T1. On the other hand, the peripheral portion of this tapping side tube portion 11a" As described above, the combustion gas supply amount is not increased. Accordingly, it is possible to appropriately prevent hot water from being heated and boiling in the hot water side pipe body portion 11a "and its peripheral portion. When the hot water is boiled, bubbles are generated in the heat transfer tube T1 and smooth. In addition to the fact that the hot water circulation is not performed, the heat transfer tube T1 is not cooled by the hot water and the heat transfer tube T1 is thermally damaged. However, according to the present embodiment, such a problem can be appropriately prevented. It is.

  FIG. 10 shows another embodiment of the present invention. In the figure, the same or similar elements as those of the above embodiment are denoted by the same reference numerals as those of the above embodiment, and the description thereof is omitted. In the hot water apparatus WH2 shown in the figure, the primary heat exchanger HE1 and the secondary heat exchanger HE2 are not configured in one can two circuits, but are configured to have a hot water supply function of only one system. ing. In the present embodiment, a member corresponding to the partition member 3 of the above-described embodiment is not used, and the side wall 60d ′ of the can 6 is opposed to and close to the tapping side tube body portion 11a ″. The side wall portion 60d 'corresponds to another specific example of the second side wall portion in the present invention.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the heat exchanger and the hot water apparatus according to the present invention can be variously modified within the range intended by the present invention.

  As means for increasing the amount of combustion gas supply in the peripheral region of the water inlet side tube portion 11a 'and decreasing the amount of combustion gas supply in the peripheral region of the tapping water side tube portion 11a ", the width of the gaps C1 and C2 is used. Only a means for setting L1 and L2 to a relationship of L1> L2 may be applied, and a means for unevenly providing the flow regulating portions 20 and 21 for the combustion gas provided on the fin 2A may be omitted. On the contrary, it is also possible to adopt a configuration in which means for providing the combustion gas flow restricting portions 20 and 21 non-uniformly is applied, and means for setting the relationship of L1> L2 is not applied.

  The heating gas flow restricting portion referred to in the present invention has a form in which a part of the surface of each fin is protruded so as to be a resistance when the heating gas passes between the plurality of fins. That's fine. Therefore, as described above, a part of the fin is extruded or formed to be raised, and for example, a burring hole (a peripheral part of the hole stands up in a convex shape) can be used.

  The hot water apparatus according to the present invention does not necessarily have to be configured with two primary and secondary heat exchangers, and only one heat exchanger according to the present invention is used as the heat exchanger. It can also be a hot water device. In the above-described embodiment, a heat exchanger is provided above the burner so that the combustion gas proceeds from the lower side to the upper side of the heat exchanger. It is also possible to adopt a reverse combustion system in which a heat exchanger is provided below the gas and the combustion gas advances from the upper side to the lower side. The heating gas referred to in the present invention is not limited to the combustion gas generated using a burner, and high-temperature exhaust gas discharged from, for example, a fuel cell or a gas engine can also be used. 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. Widely includes equipment for producing hot water.

WH1, WH2 water heater HE1 primary heat exchanger (heat exchanger according to the present invention)
HE2 secondary heat exchanger T1 first heat transfer tube (heat transfer tube)
C1, C2 Gap 2A Fin 3 Partition member 6 Can body 11a Straight tubular body portion 11a 'Incoming water tubular body portion 11a "Hot water outlet side tubular body portion 12a Connecting tubular body portions 20, 21 Flow regulating portion (flow of heating gas Regulatory Department)
30a Side wall (second side wall)
60c side wall (first side wall)
60d 'side wall (second side wall)

Claims (5)

A heat transfer tube having a plurality of straight tube sections penetrating through a plurality of plate-shaped fins;
A can body having a plurality of side wall portions surrounding the plurality of straight tubular body portions and the plurality of fins, and having both upper and lower side portions as openings for inflow and outflow of a heating gas. And
In the heat transfer tube, the plurality of straight tube portions are arranged at intervals in the front-rear or left-right width direction of the can body and are provided in a single stage in the vertical height direction of the can body. Formed in a serpentine shape connected in series through the section,
Of the two straight tube portions located at both ends of the heat transfer tube in the width direction, one is a water inlet tube portion and the other is a hot water discharge tube portion, and the flow of hot water in the heat transfer tube Is a heat exchanger configured to be made in one direction from the water inlet side pipe body part toward the hot water outlet side pipe body part,
The width of the gap between the water inlet side pipe body part and the first side wall part of the can body facing and approaching the water inlet side pipe body part is the second side wall part of the can body facing and approaching the hot water side pipe body part. The heat exchanger is characterized by being larger than the width of the gap. A heat transfer tube having a plurality of straight tube sections penetrating through a plurality of plate-shaped fins;
A can body having side walls surrounding the plurality of straight tubular body portions and the plurality of fins, and upper and lower both surface portions being openings for inflow and outflow of heating gas, and
In the heat transfer tube, the plurality of straight tube portions are arranged at intervals in the front-rear or left-right width direction of the can body and are provided in a single stage in the vertical height direction of the can body. Formed in a serpentine shape connected in series through the section,
Of the two straight tube portions located at both ends of the heat transfer tube in the width direction, one is a water inlet tube portion and the other is a hot water discharge tube portion, and the flow of hot water in the heat transfer tube Is a heat exchanger configured to be made in one direction from the water inlet side pipe body part toward the hot water outlet side pipe body part,
The plurality of fins are provided with a plurality of heating gas flow restricting portions in which a part of the surface of each fin is protruded so as to provide resistance when the heating gas passes between the plurality of fins. Provided,
As the plurality of flow restricting portions , there is provided a flow restricting portion on the outermost hot water side located between or above or below the hot water side pipe body portion and the second side wall portion of the can facing and approaching it. While
There is no flow restricting portion provided between the water inlet side pipe body portion and the first side wall portion of the can body facing and approaching the water inlet side, or on the upper and lower side thereof, or on the most hot water side. A flow restricting portion having a smaller resistance to the flow of the heating gas than the flow restricting portion is provided,
The heat exchanger is configured such that the resistance to the flow of the heating gas is greater in the peripheral part of the hot water side pipe part than in the peripheral part of the water inlet side pipe part. . A heat transfer tube having a plurality of straight tube sections penetrating through a plurality of plate-shaped fins;
A can body having side walls surrounding the plurality of straight tubular body portions and the plurality of fins, and upper and lower both surface portions being openings for inflow and outflow of heating gas, and
In the heat transfer tube, the plurality of straight tube portions are arranged at intervals in the front-rear or left-right width direction of the can body and are provided in a single stage in the vertical height direction of the can body. Formed in a serpentine shape connected in series through the section,
Of the two straight tube portions located at both ends of the heat transfer tube in the width direction, one is a water inlet tube portion and the other is a hot water discharge tube portion, and the flow of hot water in the heat transfer tube Is a heat exchanger configured to be made in one direction from the water inlet side pipe body part toward the hot water outlet side pipe body part,
The plurality of fins are provided with a plurality of heating gas flow restricting portions in which a part of the surface of each fin is protruded so as to provide resistance when the heating gas passes between the plurality of fins. Provided,
As the plurality of flow restricting portions, there are a plurality of flow restricting portions provided between the plurality of straight tubular portions, and among the plurality of straight tubular portions, the water inlet side tubular portion and The flow restricting portion provided between the adjacent straight tube portions and in the region above and below them is provided between each other straight tube portions and in the region above and below them. The resistance to the flow of the heating gas is smaller than the flow restricting portion,
The heat exchanger is configured such that the resistance to the flow of the heating gas is greater in the peripheral part of the hot water side pipe part than in the peripheral part of the water inlet side pipe part . . The heat exchanger according to claim 2 or 3,
The width of the gap between the water inlet side pipe body part and the first side wall part of the can body facing and approaching the water inlet side pipe body part is the second side wall part of the can body facing and approaching the hot water side pipe body part. The heat exchanger is larger than the width of the gap . A hot water apparatus comprising the heat exchanger according to any one of claims 1 to 4 .

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