JP5288169B2 - Heat exchanger and water heater - Google Patents

Description

  The present invention relates to a heat exchanger that performs heat recovery from a heating medium such as combustion gas using a heat transfer tube and performs hot water heating, and a hot water apparatus such as a hot water supply apparatus including the heat exchanger.

  The present applicant has previously proposed the one described in Patent Document 1 as a specific example of a heat exchanger using a heat transfer tube. The heat exchanger tube of the heat exchanger described in the same document has a plurality of coil tube portions in which a plurality of loop portions are arranged in the axial length direction, and the plurality of coil tube portions are substantially concentrically wound. It has the structure provided in. Inner space portions of the plurality of coil tube portions are partitioned into first and second space portions by a partition member, and the plurality of coil tube portions surround first and second space portions, respectively. It is divided into 1 and 2nd heat exchange parts. When the combustion gas generated by the burner is supplied to the first space portion, the combustion gas passes between the loop portions of the first heat exchange portion, and then passes between the loop portions of the second heat exchange portion. Pass between. In such a process, sensible heat and latent heat are recovered from the combustion gas. On the other hand, a pair of header parts for incoming and outgoing hot water are connected to both ends of the plurality of coil pipe parts, and water supplied from the outside to the header part for incoming water is the coil pipe on the inner circumference side. After flowing in parallel with the coil section on the outer peripheral side and the coil tube portion on the outer peripheral side, it reaches the header portion for hot water and is mixed.

  However, the prior art still has room for improvement as described below.

  That is, in the prior art, as described above, hot water that is individually heated by flowing in parallel through the coil body portion on the inner periphery side and the coil tube portion on the outer periphery side is mixed in the header portion for hot water supply. Is done. On the other hand, the combustion gas supplied to the first space portion acts on the outer peripheral side coil tube portion after acting on the inner peripheral side coil tube portion of the first heat exchange portion. The hot and cold water generated by passing through the coil body portion on the peripheral side is considerably hotter than the hot water generated by heating through the coil tube portion on the outer peripheral side. Therefore, the hot water discharged from the header portion for hot water becomes hot water mixed with hot water having a large temperature difference that has passed through the inner and outer coil tube portions. In this case, the temperature of the hot water that has passed through the coil body portion on the inner peripheral side is always considerably higher than the target hot water temperature, and if the target hot water temperature is set higher, the inner peripheral coil There is a risk that hot water will boil in the tube section. It is strongly desired to avoid boiling of hot water in the coil tube body from the viewpoint of protection of the coil tube body and various other aspects. In Patent Document 1, as means for preventing boiling of hot water, a means for making the diameter of the coil body part on the inner peripheral side larger than the diameter of the coil pipe part on the outer peripheral side is proposed. From the standpoint of rationalization and the like, there is a case where it is desired to make the tube diameters of the coil tube portions on the inner peripheral side and the outer peripheral side the same. Therefore, there is still room for improvement in this respect.

JP 2006-317034 A

  The present invention has been conceived under the circumstances as described above, and it is possible to suitably suppress the boiling of hot water in the heat transfer tube by a simple means and suitably perform high temperature hot water, In addition, an object of the present invention is to provide a heat exchanger capable of obtaining high heat exchange efficiency, and a hot water device including the heat exchanger.

  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 has a plurality of coil tube portions in which a plurality of loop portions are arranged in the axial length direction, and the plurality of coil tube portions are substantially concentric. A heat transfer tube having a lap winding shape, inner space portions of the plurality of coil tube portions are partitioned into first and second space portions in the axial length direction, and the plurality of coil tube portions are A partition member partitioned into first and second heat exchanging portions surrounding the first and second space portions respectively, a water inlet and a hot water outlet, and water entering and discharging hot water into the plurality of coil tube portions And when the heating medium is supplied to the first space portion, the heating medium is connected between the loop portions of the first and second heat exchanging portions. Between the first and second heat exchangers. Are from the heating medium and sequentially capable of recovering the sensible heat and latent heat, a heat exchanger, as a component of the heat transfer tube, substantially concentric height dimension of the axial direction is aligned substantially in the same A plurality of coil tube units having a configuration in which an extended tube body portion is connected to each end portion of the plurality of coil tube body portions formed in a lap winding shape, and the extended tube body portion is connected to the header portion. The plurality of coil tube units are arranged in the axial direction, the first heat exchange unit is configured using a plurality of the coil tube units, and the second heat exchange unit is The coil pipe unit is configured using at least one, and when water is introduced into the heat transfer pipe, the water supplied to the water inlet is the inner peripheral side of the second heat exchange unit and After flowing in parallel through the coil body on the outer peripheral side, the first heat A plurality of coil tube parts on the outer peripheral side of the replacement part flow in parallel, and then a plurality of coil tube parts on the inner peripheral side of the first heat exchange part flow in parallel to reach the tap. It is characterized by being composed .
The heat exchanger provided by the second aspect of the present invention has a plurality of coil tube portions in which a plurality of loop portions are arranged in the axial length direction, and the plurality of coil tube portions are substantially concentric. A heat transfer tube having a lap winding shape, inner space portions of the plurality of coil tube portions are partitioned into first and second space portions in the axial length direction, and the plurality of coil tube portions are A partition member partitioned into first and second heat exchanging portions surrounding the first and second space portions respectively, a water inlet and a hot water outlet, and water entering and discharging hot water into the plurality of coil tube portions Header to perform
And when the heating medium is supplied to the first space portion, the heating medium sequentially advances between the loop portions of the first and second heat exchange portions. The heat exchanger is capable of sequentially recovering sensible heat and latent heat from the heating medium by the first and second heat exchanging units, and as a component of the heat transfer tube, An extended tube portion is connected to each end portion of the plurality of coil tube portions that are substantially concentric in height and are substantially concentric, and the extended tube portion is connected to the header portion. A plurality of coiled tube units having a connected configuration, wherein the plurality of coiled tube units are arranged in the axial length direction, and the first heat exchanging unit uses a plurality of the coiled tube units. The second heat exchanging unit is configured with the coil tube unit. When water is introduced into the heat transfer tube, the water supplied to the water inlet is supplied from the coil tube body portion of the second heat exchange portion and the first heat exchange portion. After flowing in parallel through the plurality of coil tube parts on the outer peripheral side of the heat exchange part, it flows in parallel through the plurality of coil tube parts on the inner peripheral side of the first heat exchange part to reach the outlet. It is characterized by being configured.

According to such a configuration, the following effects can be obtained.
First, when water is passed through the heat transfer pipe, the hot water reaching the outlet of the header portion passes through the coil tube portion on the outer periphery side of the first heat exchange portion, and the coil tube portion on the inner periphery side thereof. It will be the last hot water that passed through. That is, according to the present invention, unlike the prior art, hot water that has flowed in parallel through a plurality of routes of the heat transfer tube is not mixed and then discharged from the header, and is heated to the highest temperature by the heating medium. Hot water that has finally passed through the coil body portion on the inner peripheral side of the first heat exchange portion to be heated reaches the hot water outlet of the header portion, and can be discharged as it is. Therefore, according to the present invention, hot water heating is performed so that the hot water temperature in the coil tube portion on the inner peripheral side of the first heat exchange portion is equal to or substantially the same as the target hot water temperature from the header portion. Well, it is not necessary to perform hot water heating so that the hot water temperature in the coil body portion on the inner peripheral side is considerably higher than the target hot water temperature. As a result, it becomes difficult for boiling water in the coil pipe body portion on the inner peripheral side to boil, and it is suitable for performing hot hot water discharge. It is possible to eliminate the need to use a large-diameter pipe as a means for preventing boiling of hot water in the coil body on the inner peripheral side.
On the other hand, since the coil tube body constituting the second heat exchange part can be supplied with water supplied to the header part in an unheated low temperature state, the heating medium by the second heat exchange part It is also possible to increase the amount of latent heat recovered from the heat and increase the heat exchange efficiency.
Furthermore, by changing the number of coil tube units, the specification of the volume of the entire heat transfer tube can be easily changed, as well as how to connect the extended tube portion and header portion of the coil tube unit, etc. By changing, the advantage that the order of water flow to the plurality of coiled tube parts can be easily set to a predetermined order is also obtained.
According to the heat exchanger provided by the first aspect of the present invention, the operation intended by the present invention can be suitably obtained by a relatively simple water passage structure. In addition, water flow to the inner and outer coil tube portions of the second heat exchanging portion is performed in parallel, and to the plurality of coil tube portions on the outer peripheral side of the first heat exchanging portion. Since water flow is also made in parallel, and further, water flow to the plurality of coil tube parts on the inner peripheral side of the first heat exchange part is made in parallel, it is substantially from the water inlet to the water outlet. The hot water flow path length can be shortened, the hot water flow path resistance can be reduced, and the pressure loss can be reduced.
According to the heat exchanger provided by the second aspect of the present invention, the substantial hot water flow path length from the water inlet to the hot water outlet can be further shortened, and the direction in which the hot water flows through the heat transfer tube. The number of conversions can be reduced. Therefore, it is possible to reduce the pressure loss when hot water flows through the heat transfer tube.

A hot water apparatus provided by the third aspect of the present invention includes a burner and a heat exchanger for performing heat recovery from the combustion gas generated by the burner to perform hot water heating. And the heat exchanger provided by the 1st or 2nd side surface of this invention is used as said heat exchanger, It is characterized by the above-mentioned.

According to such a configuration, the same effect as described for the heat exchanger provided by the first or second 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 structure related to the heat exchanger with which this invention was applied, a hot water apparatus provided with the same, and these. As clearly shown in FIG. 1, the hot water device WH of the present embodiment includes a burner 1 and a heat exchanger HE. The burner 1 is, for example, a gas burner. A gas mixture of combustion air and fuel gas is supplied to the burner 1 using a fan (not shown), and this gas mixture is ignited by an ignition plug (not shown). Combustion is performed by operation. The burner 1 is disposed in a first space portion 7A described later of the heat exchanger HE.

  The heat exchanger HE has a casing 2, a heat transfer tube T accommodated in the casing 2, and a header portion 5 for causing the heat transfer tube T to pass water. The casing 2 has a peripheral wall portion 20 surrounding the periphery of the plurality of coil tube units U, and at both ends in the horizontal direction, an insertion opening 21 for the burner 1 and an exhaust port 22 for the combustion gas after heat recovery. Is formed.

  The heat transfer tube T is configured using a plurality of coil tube units U (U1 to U3). As shown in FIG. 2 and FIG. 3, each coil tube unit U has two coil tube portions 3A and 3B having different winding diameters and having the same height in the axial length direction. It has a concentric lap winding configuration. The tube diameters (bore diameters) of the coil tube parts 3A and 3B are the same or substantially the same. Each of the coil tube portions 3A and 3B has a configuration in which a plurality of circular spiral loop portions 30 are connected in series, and a gap for allowing combustion gas to pass between the plurality of loop portions 30. Is formed. Extending tube bodies 4A, 4A ′, 4B, 4B ′ are connected to both ends of the coil tube portions 3A, 3B, and these are all directed outward of the coil tube portions 3A, 3B. It extends. In the present embodiment, the coiled tube portion 3A and the extended tube portions 4A and 4A ′, and the coil tube portion 3B and the extended tube portions 4B and 4B ′ are each made of one metal tube. Are integrally formed by bending. However, unlike such a configuration, the extended tube portions 4A, 4A ′, 4B, and 4B ′ are formed using separate members and connected to the coil tube portions 3A and 3B. You can also

  As shown in FIG. 1, the plurality of coil tube units U are arranged in the casing 2 in a state in which their axial length directions are substantially horizontal (in FIGS. 4 to 6, however). , A plurality of coiled tube units U are shown in a vertically arranged posture). As positioning means for the coil tube unit U, a set of spacers 29a and 29b and other members (not shown) that sandwich them in the horizontal direction are appropriately used. A partition member 28 is provided between the coil tube units U2 and U3, and an inner region of the coil tube units U1 to U3 includes a first space portion 7A in which the burner 1 is disposed, and combustion gas. The second space portion 7 </ b> B communicating with the discharge port 22 is partitioned. As a result, the respective coil tube bodies 3A and 3B of the coil tube units U1 and U2 serve as a first heat exchange portion H1 surrounding the first space portion 7A. Further, the coil tube bodies 3A and 3B of the coil tube unit U3 are second heat exchange portions H2 surrounding the second space portion 7B. When the burner 1 is driven to generate combustion gas in the first space portion 7A, the combustion gas passes between the loop portions 30 of the first heat exchange portion H1 and passes through the first heat exchange portion H1. , After passing between the loop portions 30 of the second heat exchange portion H2, flows into the second space portion 7B, and thereafter is discharged from the discharge port 22 to the outside of the casing 2. . In such a process, sensible heat and latent heat are sequentially recovered from the combustion gas by the first and second heat exchanging units H1 and H2.

  The extended tube portions 4A, 4A ′, 4B, 4B ′ of each coil tube unit U are connected to the header portion 5. As shown in FIGS. 1 and 4, the header portion 5 has a front plate portion 55 having a water inlet 50 and a hot water outlet 51, and a base portion 56 to which the front plate portion 55 is joined, and the inside thereof. Has a configuration in which a plurality of partition walls 57a for defining a plurality of hot water inflow chambers 57 communicating with the extended tube portions 4A, 4A ′, 4B, 4B ′ are provided. The water inlet 50 of the header section 5 is supplied with water from a water supply pipe (not shown), and the water supplied to the water inlet 50 passes through the plurality of coiled pipe units U through a path to be described later, and then the hot water outlet. It reaches 51 and takes out hot water outside.

  The header portion 5 is configured to allow water to flow to the plurality of coiled tube units U through a route as shown in FIG. That is, the header portion 5 guides the water supplied from the outside to the water inlet 50 to the extending tube portions 4A3 ′ and 4B3 ′, passes through the coil tube portions 3A3 and 3B3, and extends the tube portions 4A3 and 4B3. The hot water flowing out from the pipe is guided to the extended pipe parts 4B1 and 4B2 and supplied to the coil pipe parts 3B1 and 3B2. Further, the hot water flowing out of the extended tube portions 4B1 ′ and 4B2 ′ through the coil tube portions 3B1 and 3B2 is guided to the extended tube portions 4A1 ′ and 4A2 ′, and the coil tube portions 3A1 and 3B It is configured to supply to 3A2. The hot water that has passed through these pipes and has flowed out of the extended pipe portions 4A1 and 4A2 reaches the outlet 51.

  If the above-described water passage is simplified and shown more easily, it will be as shown in FIG. In the figure, numerals (1) to (3) are given to the plurality of coiled tube parts 3A1 to 3A3 and 3B1 to 3B3, and these numerals indicate the water flow order. That is, as shown in the figure, in the present embodiment, water is first supplied to the two coil tube portions 3A3 and 3B3 constituting the second heat exchanging portion H2, and heat is generated by passing through them. The hot water then flows in parallel through the two coil tube portions 3B1 and 3B2 on the outer peripheral side of the first heat exchange portion H1. After passing through these, the hot water finally flows in parallel through the two coil tube portions 3A1, 3A2 on the inner peripheral side of the first heat exchanging portion H1, and then reaches the hot water outlet 51.

  When latent heat recovery is performed by the second heat exchange unit H2, water vapor in the combustion gas is condensed, and a drain (condensed water) is generated and attached to the surface of the coiled tube part 3 of the second heat exchange unit H2. . On the other hand, as shown in FIGS. 1 and 2, the extended tube portions 4A, 4A ′, 4B, and 4B ′ extend downward from the coil tube portions 3A and 3B. For this reason, the drain easily flows downward along the surfaces of the extending tube portions 4A, 4A ', 4B, 4B'. Preferably, the header portion 5 has a shape capable of receiving a drain flowing from above, and a drain discharge port (not shown) for discharging the received drain to the outside of the header portion 5 and the casing 2. It is set as the structure provided.

  Next, the operation of the hot water device WH provided with the above-described heat exchanger HE will be described.

  First, when the burner 1 is driven to generate combustion gas in the first space portion 7A, as described above, this combustion gas flows between the plurality of loop portions 30 of the first heat exchange portion H1. After passing through the first heat exchanging part H1 and passing around the first heat exchanging part H1, it passes between the plurality of loop parts 30 of the second heat exchanging part H2 and flows into the second space part 7B, and then the outlet. 22 is discharged to the outside of the casing 2. Each of the first and second heat exchanging parts H1 and H2 is configured using the coiled tube parts 3A and 3B having a double winding structure, and the loop parts 30 of the coiled tube parts 3A and 3B are Since the coil tube portions 3A and 3B are formed using circular tubes because they are arranged in the flow direction of the combustion gas, the combustion gas efficiently acts on them, and the combustion gas It is possible to increase the amount of heat recovered from.

  In the second heat exchanging part H2, latent heat is recovered from the combustion gas after the sensible heat is recovered by the first heat exchanging part H1, but the coil tube parts 3A3 of the second heat exchanging part H2 are recovered. As described with reference to FIGS. 5 and 6, the water supplied to the water inlet 50 is supplied to 3B3 in a non-heated low temperature state. Therefore, the amount of latent heat recovery in the second heat exchange unit H2 can be increased, and the heat exchange efficiency can be increased.

  In the heat exchanger HE of the present embodiment, the hot water reaching the outlet 51 of the header portion 5 passes through the coil tube portions 3B1 and 3B2 on the outer peripheral side of the first heat exchange portion H1, and is coiled on the inner peripheral side. Only hot water that has finally passed through the tube portions 3A1 and 3A2. For this reason, the hot water discharged from the header portion 5 to the outside is a mixture of hot water and water passing through the coil tube portions 3A1 and 3A2, respectively. The coil tube portions 3A1 and 3A2 are both burners 1 Is the coil tube portion on the inner peripheral side that is closest to the heater, and is easily heated to the highest temperature by the burner 1, and it is difficult for a large difference in the hot water heating temperature between them. Therefore, unlike the present embodiment, for example, the hot water that has flowed separately through the coil body portion 3A on the inner peripheral side and the coil tube portion 3B on the outer peripheral side to cause a large temperature difference is mixed and then discharged. Compared with the case of making it hot, when the target hot water temperature is set high, the hot water in the coil body part 3A on the inner peripheral side can be made difficult to boil. Therefore, it is suitable for performing high temperature hot water. Further, in the method in which hot water with a large temperature difference is mixed and then discharged to the outside, it becomes difficult to control or control the temperature of the hot water. However, according to the heat exchanger HE of this embodiment, such a temperature of the hot water is high. Management or control is also facilitated.

  As described with reference to FIG. 6, in this heat exchanger HE, water is passed through the coil tube portions 3A3 and 3B3 in parallel, and is also passed through the coil tube portions 3B1 and 3B2. Water is also arranged in parallel, and further, water is passed through the coil tube portions 3A1, 32 in parallel. For this reason, compared with the case where the total amount of hot water flows through each of the plurality of coil tube portions in series, the substantial flow path length of hot water from the water inlet 50 to the hot water outlet 1 is shorter. Thus, the effect of reducing the pressure loss of the hot water in the heat transfer tube T is also obtained.

  7 and 8 show another embodiment of the present invention. In the figure, the same or similar elements as those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the embodiment shown in FIG. 7 and FIG. 8, the way of water flow to the heat transfer tube T is different from that of the above embodiment. More specifically, in the present embodiment, as shown in FIG. 7, the hot water from the water inlet 50 branches and flows into a plurality of parts, and some of them flow into the extended tube portions 4A3 ′ and 4B3 ′. It is guided and flows in parallel through the coil tube portions 3A3 and 3B3, and the other part is guided to the extended tube portions 4B1 ′ and 4B2 ′ and flows in parallel through the coil tube portions 3B1 and 3B2 on the outer peripheral side. . Next, the hot and cold water that has passed through these coil tube portions 3A3 and 3B3 and the coil tube portions 3B1 and 3B2 on the outer peripheral side to reach the extended tube portions 4A3, 4B3, 4B1 and 4B2, It is guided in a state branched to 4A1 and 4A2, and is configured to flow in parallel through the coil body portions 3A1 and 3A2 on the inner peripheral side. The hot water that has passed through the coil tube portions 3A1, 3A2 on the inner peripheral side is discharged from the extended tube portions 4A1 ', 4A2', and reaches the hot water outlet 51.

  If the above-mentioned water passage is simplified and shown more easily, it will be as shown in FIG. In the figure, numerals (1) and (2) indicating the water flow order are attached to the plurality of coiled tube portions 3A1 to 3A3 and 3B1 to 3B3. That is, in this embodiment, the two coil tube parts 3A3 and 3B3 constituting the second heat exchange part H2 and the two outer coil side coil parts constituting the part of the first heat exchange part H1. Water is first supplied to 3B1 and 3B2. Subsequently, the hot water that has passed through these flows in parallel through the two coil tube parts 3A1, 3A2 on the inner peripheral side of the first heat exchange part H1, and then reaches the hot water outlet 51.

  According to the present embodiment, hot water from the water inlet 50 flows in parallel through the four coil tube portions 3A3, 3B3, 3B1, 3B2, and then flows in parallel through the two coil tube portions 3A1, 3A2. 51, and flows in two stages through the above-described six coil tube portions. Therefore, as compared with the above-described embodiment (see FIG. 6) in which a total of six coil tube portions are flowing in three stages, the number of turns when hot water flows through the heat transfer tube T is reduced, and substantial hot water is supplied. The water flow path length can also be shortened, and the pressure loss of the hot water flow can be further reduced. Of course, also in this embodiment, when hot water flows through the heat transfer tube T, the hot water that has finally passed through the coil tube portions 3A1 and 3A2 on the inner peripheral side of the first heat exchange portion H1 is also provided. Therefore, the boiling suppression effect of hot water when the target hot water temperature is set high is obtained. In addition, since the non-heated low-temperature water is supplied to the second heat exchanging portion H2, the amount of latent heat recovered from the combustion gas can be increased.

  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 varied in design in various ways.

  For example, with respect to the heat transfer tube, instead of the configuration in which the coil tube body portion is double-wound, the coil tube body portion may be configured to have a multiple winding structure of triple winding or more. Further, from the viewpoint of facilitating the manufacture of the heat exchanger, it is preferable to configure the heat transfer tube using a plurality of coiled tube units whose shapes and sizes are unified, but the present invention is not limited to this. When latent heat is recovered from combustion gas, an acidic drain is generated, so it is preferable to make the heat transfer tube a material with excellent acid resistance such as stainless steel, but the specific material of the coil tube unit is also limited to this. Not. The header portion referred to in the present invention is not necessarily configured as a single header portion, and may be divided into, for example, a header portion having a water inlet and a header portion having a hot water outlet. As a means for connecting a plurality of coiled tube portions, a configuration using a relatively short connecting tube can be used.

  As in the heat exchanger shown in FIG. 1, when a plurality of coiled tube parts are provided side by side, each loop part is in an upright posture, and is generated with latent heat recovery. Although an advantage that the drain can easily flow downward from each loop portion is obtained, the present invention is not limited to this. In this invention, it can also comprise so that the axial length direction of a some coil pipe | tube part may turn into a perpendicular direction or the direction inclined with respect to this. As the heating medium in the present invention, for example, high-temperature waste gas other than the combustion gas can 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. It is a concept that includes a wide range of equipment for producing hot water.

It is sectional drawing which shows an example of the heat exchanger which concerns on this invention, and a warm water apparatus provided with the same. It is II-II sectional drawing of FIG. It is a perspective view which shows the coiled tube unit used with the heat exchanger shown in FIG. It is a perspective view which shows the structure of the heat exchanger tube and header part of the heat exchanger shown in FIG. It is explanatory drawing which shows an example of the water flow path | route to the heat exchanger tube shown in FIG. It is explanatory drawing which simplified and showed the water flow path to the heat exchanger tube shown in FIG. It is explanatory drawing which shows the other example of the water flow path to the heat exchanger tube shown in FIG. It is explanatory drawing which simplified and showed the water flow path | route to the heat exchanger tube shown in FIG.

Explanation of symbols

WH Hot water apparatus HE Heat exchanger U Coil tube unit H1, H2 1st and 2nd heat exchange part 1 Burner 2 Casing 3A Coil pipe body part (inner peripheral side)
3B Coil tube (outside)
4A, 4A 'Extension tube part (inside of the coil tube part on the inner periphery side)
4B, 4B 'Extension tube part (outside coil tube part)
5 Header part 7A, 7B 1st and 2nd space part 30 Loop part (coil pipe body part)
50 water inlet 51 water outlet

Claims (3)

A heat transfer tube having a plurality of coil tube portions in which a plurality of loop portions are arranged in the axial length direction, and the plurality of coil tube portions being substantially concentrically wound;
The inner space portions of the plurality of coil tube portions are partitioned into first and second space portions in the axial length direction, and the plurality of coil tube portions are surrounded by the first and second space portions, respectively. A partition member partitioning into first and second heat exchange parts;
A header portion having a water inlet and a hot water outlet, and for allowing water to enter and exit from the plurality of coil tube portions,
When the heating medium is supplied to the first space portion, the heating medium sequentially advances between the loop portions of the first and second heat exchange units, and the first and second A heat exchanger capable of sequentially recovering sensible heat and latent heat from the heating medium by a heat exchange unit,
As a constituent element of the heat transfer tube, an extended tube portion is connected to each end portion of a plurality of coil tube portions that are substantially concentrically wound with the same height in the axial length direction. And this extended tube part is provided with a plurality of coil tube units having a configuration connected to the header part,
The plurality of coil tube units are arranged in the axial length direction, the first heat exchange unit is configured by using a plurality of the coil tube units, and the second heat exchange unit is formed of the coil tube. It consists of at least one unit,
When water is introduced into the heat transfer tube, the water supplied to the water inlet flows in parallel through the coil tube portions on the inner peripheral side and the outer peripheral side of the second heat exchange unit, A plurality of coil tube parts on the outer peripheral side of the first heat exchange part flow in parallel, and then a plurality of coil tube parts on the inner peripheral side of the first heat exchange part flow in parallel to the outlet. A heat exchanger, characterized in that it is configured to reach . A heat transfer tube having a plurality of coil tube portions in which a plurality of loop portions are arranged in the axial length direction, and the plurality of coil tube portions being substantially concentrically wound;
The inner space portions of the plurality of coil tube portions are partitioned into first and second space portions in the axial length direction, and the plurality of coil tube portions are surrounded by the first and second space portions, respectively. A partition member partitioning into first and second heat exchange parts;
A header portion having a water inlet and a hot water outlet, and for allowing water to enter and exit from the plurality of coil tube portions,
When the heating medium is supplied to the first space portion, the heating medium sequentially advances between the loop portions of the first and second heat exchange units, and the first and second A heat exchanger capable of sequentially recovering sensible heat and latent heat from the heating medium by a heat exchange unit,
As a constituent element of the heat transfer tube, an extended tube portion is connected to each end portion of a plurality of coil tube portions that are substantially concentrically wound with the same height in the axial length direction. And this extended tube part is provided with a plurality of coil tube units having a configuration connected to the header part,
The plurality of coil tube units are arranged in the axial length direction, the first heat exchange unit is configured by using a plurality of the coil tube units, and the second heat exchange unit is formed of the coil tube. It consists of at least one unit,
When water is introduced into the heat transfer tube, the water supplied to the water inlet is a coil tube body portion of the second heat exchange portion and a plurality of coils on the outer peripheral side of the first heat exchange portion. After flowing through the pipe body part in parallel, it is configured to flow in parallel through the plurality of coil pipe part parts on the inner peripheral side of the first heat exchange part to reach the hot water outlet. , Heat exchanger. A hot water apparatus comprising a burner and a heat exchanger for performing heat recovery from combustion gas generated by the burner to perform hot water heating,
A hot water apparatus, wherein the heat exchanger according to claim 1 or 2 is used as the heat exchanger.

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