JP6837589B2 - Heat exchanger and heat source machine - Google Patents

Description

The present invention relates to, for example, a heat exchange technique used in a one-can, three-water heat source machine or the like.

A one-can, three-water type heat source machine is used as a heat source for a so-called water heater with a heating function, which has multiple functions such as hot water supply, bathtub water reheating, and hot water heating. In a one-can, three-water type heat source machine, one burner is used as a heat source, and the combustion exhaust of the burner performs hot water supply heating, reheating heating, and heating water heating consisting of a plurality of systems.

When exchanging heat from the combustion exhaust of the burner with water supply, bath water or heating water, both primary heat exchange that recovers the actual heat of the combustion exhaust and secondary heat exchange that exchanges heat with the latent heat of the combustion exhaust after the primary heat exchange are used together. However, it is known to improve the efficiency of heat exchange.

Regarding this type of heat source machine, heat exchangers including a secondary heat exchanger that heats both a circulation circuit such as a reheating circuit and a heating circuit and a hot water supply circuit, and a water heater using the heat exchanger are known. (For example, Patent Document 1, Patent Document 2).

Japanese Unexamined Patent Publication No. 2004-28446 Japanese Unexamined Patent Publication No. 2004-28447

By the way, in a heat source machine equipped with primary and secondary heat exchangers, if low-temperature water supply is preheated by secondary heat exchange and then primary heat exchange is performed, the heat of the combustion exhaust is transferred to the primary and secondary. The ultimate high-efficiency heat exchange can be performed and heated. This high efficiency of heat exchange is more effective as the temperature of the water supply is lower.

However, with a heat medium such as heating water, the amount of heat dissipated is small, and the temperature may not be lowered as in the case of water supply. In other words, when the temperature of the heat medium returning to the heat exchanger is high, even if secondary heat exchange such as water supply is performed, the heat exchange from the combustion exhaust to the latent heat cannot be recovered, so high-efficiency heat exchange such as water supply is performed. It cannot be realized. Further, if the preheating of the heat medium is to be realized by the secondary heat exchange, not only the latent heat recovery planned for the secondary heat exchange cannot be performed as described above, but also the circulation resistance due to the circulation of the heat medium is increased. There is a problem to make it.

Therefore, in view of the above problems, an object of the present invention is to achieve ultimate heat recovery from combustion exhaust gas to a heat medium used for heating water or the like, and to realize efficient heat exchange.

In view of the above problems, another object of the present invention realizes ultimate heat recovery from combustion exhaust to a heat medium used for heating water or the like by multiplexing primary heat exchange, and realizes high efficiency of heat exchange. There is.

In order to achieve the above object, according to one aspect of the heat exchanger of the present invention, a first housing portion for accommodating a first heat exchange portion (6-1) for heat exchange between combustion exhaust and a heat medium, and a first housing portion. A second heat exchange unit (6-2) adjacent to the first housing portion and exchanging heat between the combustion exhaust and the heat medium flowing in from the first housing portion, and the combustion exhaust and water supply. A second housing portion for accommodating a third heat exchange portion (6-3) for heat exchange is provided between the ceiling portion of the first housing portion and the bottom portion of the second housing portion. , An inclined plate that inclines the bottom portion of the second housing portion, and ventilation formed on the inclined plate to guide the combustion exhaust from the first housing portion to the inside of the second housing portion. It includes a window portion and a shielding plate which is provided so as to project from the inclined plate to the ventilation window portion and has a larger inclination than the inclined plate.

In the heat exchanger, the shielding plate may cover the bottom of the second heat exchange section (6-2) or the third heat exchange section (6-3) protruding toward the ventilation window portion.

In the heat exchanger, the second housing portion has a drain receiver protruding from the side surface side of the first housing portion, and the second heat exchange portion (6-2) and the third heat. Drain generated from either or both of the exchange portions (6-3) may be flowed along the shielding plate and the inclined plate to be introduced into the drain receiver.

In the heat exchanger, the second heat exchange section (6-2) and the third heat exchange section (6-3) are adjacent to each other in the second housing section in parallel with the flow direction of the combustion exhaust. Alternatively, it may be arranged adjacent to the combustion exhaust in the vertical direction.

In order to achieve the above object, according to one aspect of the heat source machine of the present invention, the first heat exchange unit that exchanges heat between the heat medium circulating in the heat medium circuit or the bath water circulating in the reheating circuit and the combustion exhaust. The first housing portion that houses (6-1), the combustion exhaust that is adjacent to the first housing portion, flows in from the first housing portion, and the heat that circulates in the heat medium circuit. A second heat exchange unit (6-2) that exchanges heat with the medium, and a third heat exchange unit (6-3) that is provided in the hot water supply circuit and exchanges heat between the water supply flowing through the hot water supply circuit and the combustion exhaust. It is provided between the second housing portion to be stored, the ceiling portion of the first housing portion, and the bottom portion of the second housing portion, and the bottom portion of the second housing portion is inclined. An inclined plate, a ventilation window portion formed on the inclined plate and guiding the combustion exhaust from the first housing portion to the inside of the second housing portion, and a ventilation window portion extending from the inclined plate to the ventilation window portion. It is provided with a shielding plate having a larger inclination than the inclined plate.

According to the present invention, any of the following effects can be obtained.

(1) The first heat exchange section can exchange heat between the combustion exhaust and the heat medium, and the second heat exchange section exchanges the combustion exhaust that has passed through the first heat exchange section with the heat medium before passing through the first heat exchange section. Since heat can be exchanged, the apparent heat of the combustion exhaust can be recovered in the heat medium at the first heat exchange section and the second heat exchange section, and the heat conversion efficiency can be improved.

(2) Even when the heat medium circulates from the second heat exchange section to the first heat exchange section in a high temperature state, such as heating water, the second heat exchange section heats the apparent heat of the combustion exhaust. Since heat can be exchanged with the medium and the apparent heat of the combustion exhaust can be recovered by the first heat exchange section with the heat medium that has passed through the second heat exchange section, the heat conversion efficiency of the visible heat of the combustion exhaust can be improved and the heat efficiency can be improved. Can be done.

(3) For example, the combustion exhaust whose sensible heat is recovered in the first heat exchange section and the second heat exchange section can be heat-exchanged for low-temperature water supply, and the heat exchange efficiency for the water supply can be improved. Partial boiling on the water supply heating side can be prevented, combustion stoppage can be prevented frequently, and heating control becomes easy.

(4) The ultimate heat recovery from combustion exhaust to a heat medium used for heating water, etc. can be realized by multiplexing primary heat exchange, and high efficiency of heat exchange can be achieved.

It is a figure which shows an example of the heat exchanger which concerns on one Embodiment. It is a figure which shows the modification of the heat exchanger which concerns on one Embodiment. It is a perspective view which shows a part of the heat source machine which concerns on Example 1. FIG. A is a sectional view taken along line IVA-IVA of FIG. 3 in which the exhaust stack portion is omitted, and B is a sectional view taken along line IVB-IVB of A. It is a perspective view which shows the heat exchanger taken out from a heat source machine. It is a perspective view which shows from the back side of a heat exchanger. It is a figure which shows an example of the water heater which concerns on Example 2. FIG. It is a figure which shows the control system. It is a flowchart which shows an example of the processing procedure of a drive control. It is a flowchart which shows an example of the processing procedure of a drive control. It is a figure which shows the heat exchanger which concerns on other embodiment.

FIG. 1 shows a heat exchanger according to an embodiment. The configuration shown in FIG. 1 is an example, and the present invention is not limited to such a configuration.

A housing 4 is provided on the lower side of the heat exchanger 2, and the first heat exchange unit 6-1, the second heat exchange unit 6-2, and the third heat exchange unit 6-3 are provided on the upper side of the housing 4. Is provided. The housing 4 is, for example, a combustion chamber provided with a burner 8 for burning the fuel gas G, and the combustion exhaust EG generated by the combustion of the fuel gas G flows to the first heat exchange section 6-1 and the first heat. After passing through the exchange section 6-1 it flows to the second heat exchange section 6-2 and the third heat exchange section 6-3, and then is discharged from the exhaust section 10 to the outside air.

The first heat exchange section 6-1 is provided with, for example, a heat medium heat exchange pipe 12-1 as a first heat exchange pipe, and, for example, a bath water heat exchange pipe 14 as a second heat exchange pipe. In the heat medium heat exchange pipe 12-1, the primary heat exchange between the combustion exhaust EG and the heat medium M is performed, and in the bath water heat exchange pipe 14, the primary heat exchange between the combustion exhaust EG and the bath water BW is performed. Here, the primary heat exchange is the heat exchange between the sensible heat of the combustion exhaust EG and the heated fluid of the heat medium M and the bath water BW. The fluid to be heated may include water supply.

The second heat exchange section 6-2 is provided with, for example, a heat medium heat exchange pipe 12-2 as a third heat exchange pipe. This heat medium heat exchange pipe 12-2 constitutes a common heat medium circulation path with the heat medium heat exchange pipe 12-1, and is connected to the heat medium heat exchange pipe 12-1 although not shown. .. A heat medium M circulated through a heating load or a heat medium circulation path in the heat source machine is passed through the heat medium heat exchange pipe 12-2, and preheating of the heat medium M before heat exchange of the heat medium heat exchange pipe 12-1 is performed. Will be done.

The third heat exchange unit 6-3 is provided with, for example, a water supply heat exchange pipe 16 having a water supply system different from the circulation system of the heat medium M. The water supply heat exchange pipe 16 is an example of a fourth heat exchange pipe. In the water supply heat exchange pipe 16, the water supply W is preheated at the time of hot water supply.

The heat exchange of the heat exchanger 2 is as follows.

The combustion exhaust EG that has passed through the first heat exchange section 6-1 is the second heat exchange section 6-2 and the third heat exchange section 6-3 located on the downstream side of the first heat exchange section 6-1 from the housing 4. Flow to.

The heat medium M flows through the heat medium heat exchange pipe 12-2 of the second heat exchange section 6-2 to the heat medium heat exchange pipe 12-1. On the other hand, the combustion exhaust EG flows to the second heat exchange section 6-2 via the first heat exchange section 6-1. That is, with respect to the combustion exhaust EG generated from the burner 8, if the side closer to the burner 8 is the upstream side and the side far from the burner 8 is the downstream side, the first heat exchange section 6-1 heats up with the combustion exhaust EG on the upstream side. The exchange is performed, and in the second heat exchange unit 6-2, heat exchange is performed at the combustion exhaust EG on the downstream side.

In such a first heat exchange unit 6-1 and a second heat exchange unit 6-2, the sensible heat of the combustion exhaust EG and the heat exchange with the heat medium M are performed by multiplexing the primary heat exchange. The heat contained in the combustion exhaust EG that has passed through the first heat exchange section 6-1 is high temperature exhaust suitable for primary heat exchange. Moreover, it is assumed that the heat medium M is not lowered in temperature with, for example, heating water. Therefore, the second heat exchange unit 6-2 exchanges heat between the heat medium M and the sensible heat of the combustion exhaust EG, and the heat medium M heated by this exchanges heat with the first heat exchange unit 6-1. As a result, the ultimate primary heat exchange between the heat medium M and the combustion exhaust EG is performed, and the temperature of the heat medium M is raised. In this case, even when the heat medium M returning from the heating load or the heat source machine is not cooled down, it can be heated by these primary heat exchanges. The ultimate sensible heat recovery can be achieved by multiplexing the primary heat exchange.

The primary heat exchange described above does not mean to exclude the secondary heat exchange. Needless to say, when the heat medium M is lowered in temperature, not only the sensible heat of the combustion exhaust EG but also the heat exchange with the latent heat can be performed by the second heat exchange unit 6-2.

Then, in the third heat exchange unit 6-3, at the time of hot water supply, the water supply W is circulated in the water supply heat exchange pipe 16, and the secondary heat exchange between the combustion exhaust EG on the downstream side and the water supply W is performed.

<Effect of one embodiment>

(1) Ultimate heat exchange by multiplexing primary heat exchange, that is, sensible heat can be recovered from the combustion exhaust EG to realize heating of a medium to be heated such as heat medium M, and heat conversion efficiency is enhanced.

(2) Compared with a low-temperature heated fluid such as water supply, it is possible to realize heating by sensible heat of a heated medium that has not been cooled in addition to the heat medium M such as heating water.

(3) In the low-temperature heat medium M, even the latent heat from the combustion exhaust EG is absorbed by the heat medium M, and the heat conversion efficiency is enhanced.

(4) At the time of hot water supply, the water supply W is circulated through the water supply heat exchange pipe 16 to exchange the secondary heat between the combustion exhaust EG on the downstream side and the water supply W, and preheating before the main heat exchange of the water supply W is performed. it can. In this case, since the latent heat of the combustion exhaust EG is recovered by the water supply W, partial boiling of the residual water of the water supply heat exchange pipe 16 can be avoided even when the hot water supply is stopped.

In the embodiment shown in FIG. 1, the third heat exchange section 6-3 is extended above the second heat exchange section 6-2 and a part thereof is installed, but the present invention is not limited to this. For example, as shown in FIG. 2, the third heat exchange unit 6-3 may be extended and installed below the second heat exchange unit 6-2.

FIG. 3 shows an example of the heat source machine according to the first embodiment. In this heat source machine, the same parts as those in FIG. 1 or 2 are designated by the same reference numerals.

In the heat source machine 20, a heat exchanger 22 is arranged on the front side in the drawing, and a plate heat exchanger 24 is arranged on the rear side of the heat exchanger 22. The plate heat exchanger 24 is an example of a fourth heat exchanger. The heat exchanger 22 is an example of the heat exchanger 2 described above. The plate heat exchanger 24 exchanges heat between the heat medium M heated by the heat exchanger 22 and the water supply W. In this example, the water supply W is preheated by the third heat exchange section 6-3 included in the heat exchanger 22.

As shown by the broken line, the heat source machine 20 is provided with a square tubular cover portion 26-1 as a heat source machine housing, and an upper cover portion 26-2 is provided above the main body cover portion 26-1. The heat exchanger 22 is provided with a first housing portion 28-1, a second housing portion 28-2, and a third housing portion 28-3. The first housing portion 28-1 is an example of the housing 4 described above.

A fan 30 is installed under the first housing portion 28-1, and the fan 30 is rotated by a fan motor 32 to allow combustion air to flow into the first housing portion 28-1. The second housing portion 28-2 is installed on the upper side of the first housing portion 28-1, and the first heat exchange portion 6-1 described above is installed on the second housing portion 28-2. To. A third housing portion 28-3 is installed above the second housing portion 28-2. A second heat exchange unit 6-2 and a third heat exchange unit 6-3 are installed in the third housing unit 28-3. An exhaust pipe portion 34 is provided on the front side of the third housing portion 28-3, and the combustion exhaust EG after heat exchange is released to the outside air.

FIG. 4A shows the exhaust stack portion 34 of the heat source machine 20 omitted from the IVA-IVA line cross section of FIG. In the heat source machine 20, the fuel gas G air-fuel mixture ejection portion 36 is provided with respect to the burner 8 installed at the bottom of the housing 4. The air-fuel mixture is introduced into the air-fuel mixture introduction parts 40-1 and 40-2 of the burner 8 from the air-fuel mixture ejection nozzles 38-1 and 38-2 of the air-fuel mixture ejection portion 36. An igniter 42 and a frame rod 44 are provided on the upper side of the burner 8, and the igniter 42 ignites the air-fuel mixture ejected from the burner 8.

A plurality of heat medium heat exchange pipes 12-1 and bath water heat exchange pipes 14 of the first heat exchange section 6-1 are provided on the upper side of the burner 8 with a space portion 46 interposed therebetween, and a plurality of endothermic fins 48. Is installed. The heat medium heat exchange pipe 12-1 and the bath water heat exchange pipe 14 are installed in a direction intersecting the flow direction of the combustion exhaust EG, whereas each endothermic fin 48 is in a direction parallel to the flow direction of the combustion exhaust EG. is set up. The heat medium heat exchange pipe 12-1 and the bath water heat exchange pipe 14 are heat absorbing tubes that absorb heat from the combustion exhaust EG, and the heat absorbing fins 48 absorb heat from the combustion exhaust EG, and the heat medium heat exchange pipe 12-1 and the bath water. It constitutes a heat absorbing member and a heat conducting member that conduct heat to the heat exchange pipe 14. B in FIG. 4 shows the IVB-IVB line cross section of A in FIG.

In this example, a two-stage pipe row of a plurality of heat medium heat exchange pipes 12-1 is arranged in the X-axis direction in the drawing, and a bathtub is provided between the pipe rows of the heat medium heat exchange pipes 12-1 in the X-axis direction. A row of pipes of the water heat exchange pipe 14 is arranged. That is, the bath water heat exchange pipe 14 is sandwiched between the heat medium heat exchange pipes 12-1 in the Y-axis direction, and the pipe wall surfaces of the heat medium heat exchange pipe 12-1 and the bath water heat exchange pipe 14 are in close contact with each other. It enables heat conduction between the two. The heat medium heat exchange pipe 12-1 and the bath water heat exchange pipe 14 are integrated with the heat absorbing fins 48, and heat conduction in the X-axis direction and the Y-axis direction is possible.

An inclined plate 50 is installed between the ceiling portion of the second housing portion 28-2 and the bottom portion of the third housing portion 28-3, and the bottom plate 52 of the third housing portion 28-3 is inclined. I'm letting you. In this example, the bottom plate 52 is inclined to the left side in the drawing according to the inclination angle θ of the inclined plate 50. The inclination angle θ may be set so as to allow the drain D generated by heat exchange to flow along the bottom plate 52 and be introduced into the drain receiver 54.

The inclined plate 50 and the bottom plate 52 are provided with a ventilation window portion 56. The combustion exhaust EG is guided from the second housing portion 28-2 to the third housing portion 28-3 through the ventilation window portion 56. The ventilation window portion 56 is provided with a shielding plate 58 in order to allow the combustion exhaust EG to pass through and prevent the drain D from falling to the second housing portion 28-2 side. If such a shielding plate 58 is provided, even if a drain D occurs on the third housing portion 28-3 side, it is possible to prevent the drain D from falling to the second housing portion 28-2 side.

The heat medium heat exchange pipe 12-2 of the second heat exchange unit 6-2 and the water supply heat exchange pipe 16 of the third heat exchange unit 6-3 are installed in the third housing portion 28-3. The third housing portion 28-3 is provided with a drain receiver 54 projecting from the side surface side of the second housing portion 28-2. The drain receiver 54 may be formed integrally with the third housing portion 28-3 by, for example, press working, with the metal material forming the third housing portion 28-3. The drain D that has flowed along the inclined plate 50 is collected and stored in the drain receiver 54.

FIG. 5 shows the heat exchanger 22 from the exhaust unit side. The heat medium heat exchange pipe 12-2 of the second heat exchange unit 6-2 is connected to the heat medium heat exchange pipe 12-1 of the first heat exchange unit 6-1 via a heat medium pipe line 66. The high-temperature heat medium M after heating is taken out from the outlet port 64-2 of the heat medium heat exchange pipe 12-1.

After the bathtub water BW flowing into the inlet side port 68-1 (FIG. 6) of the bathtub water heat exchange pipe 14 is heated, it is returned to the bathtub from the outlet side port 68-2.

After the water supply W flowing into the inlet port 70-1 of the water supply heat exchange pipe 16 is heated, it is circulated from the outlet port 70-2 to the plate heat exchanger 24.

An exhaust port portion 72 is provided on the front surface side of the third housing portion 28-3, and the exhaust pipe portion 34 (FIG. 3) described above is attached to the exhaust port portion 72.

FIG. 6 is shown from the back side of the heat exchanger 22. For example, a low-temperature heat medium M after heat dissipation flows into the inlet port 74-1 of the heat medium heat exchange pipe 12-2, and a heating load or the like is circulated, and the outlet port of the heat medium heat exchange pipe 12-2. A heat medium line 66 is connected to 74-2, and the heat medium M heated from the heat medium line 66 flows to the inlet port 64-1 of the distribution valve 62 (FIG. 5).

<Effect of Example 1>

According to the first embodiment, the following effects can be obtained.

(1) According to the first embodiment, the same effect as that of the above-described embodiment can be obtained.

(2) Since the bath water heat exchange pipe 14 is sandwiched and adhered to the pipe row of the heat medium heat exchange pipe 12-1, the heat conduction between the two is improved and the heat recovery rate is improved. ..

(3) Since the bathtub water heat exchange pipe 14 is sandwiched and adhered to the pipe row of the heat medium heat exchange pipe 12-1, the first heat exchange section 6-1 can be made compact. ..

FIG. 7 shows a hot water supply / reheating / heating device 80 as an example of the heat source machine according to the second embodiment. In the hot water supply / reheating / heating device 80, the same parts as those in FIG. 3 are designated by the same reference numerals. In this hot water supply / reheating / heating device 80, the hot water supply function, the heating function, and the reheating function are realized by using the heat exchanger of the present invention.

The hot water supply / reheating / heating device 80 includes a device housing 82, and the device housing 82 is attached to a wall member or the like of a house.

The hot water supply / reheating / heating device 80 includes a heat exchanger 22, a plate heat exchanger 24, a heat medium tank 84, circulation paths 88-1 and 88-2 of the heat medium M, and circulation paths 88-3 of the bath water BW. , Water supply channel 88-4, hot water supply channel 88-5, and the like are provided. The heat exchanger 22 heats the bathtub water BW and preheats the water supply W, and the plate heat exchanger 24 heats the water supply W after the preheating.

The heat medium tank 84 stores the heat medium M that circulates in the circulation paths 88-1 and 88-2. The circulation path 88-1 includes a circulation pump 90-1 to circulate the high-temperature heat medium M to the high-temperature heating load 92-1. A branching portion 94-1 is provided in the circulation passage 88-1, and a low-temperature heat medium M is circulated from the branching portion 94-1 through the circulation passage 88-13 to the low-temperature heating load 92-2. In this circulation path 88-1, the heat medium heat exchange pipe 12-1 of the first heat exchange section 6-1 of the heat exchanger 22, the heat medium heat exchange pipe 12-2 of the second heat exchange section 6-2, and heat Along with the medium tank 84, a high temperature heating load 92-1 or a low temperature heating load 92-2 is included.

The circulation path 88-2 is arranged in the apparatus housing 82 and circulates the heat medium M from a part of the circulation path 88-1 by bypassing the circulation path on the high temperature heating load 92-1 and the low temperature heating load 92-2 side. Let me. Therefore, in this circulation path 88-2, the heat medium heat exchange pipe 12-1 of the first heat exchange section 6-1 of the heat exchanger 22 and the heat medium heat exchange pipe 12-2 of the second heat exchange section 6-2 And the heat medium tank 84 is included.

In this embodiment, a circulation path 88-11 is formed in the heat medium heat exchange pipe 12-1, and the heat medium heat exchange pipe 12-2 is connected to the circulation path 88-11. The circulation path 88-11 is provided with a temperature sensor 98-1, a distribution valve 96-1 and a mixing valve 96-2. The high-temperature heat medium M circulates from the distribution valve 96-1 through the circulation path 88-12 to the plate heat exchanger 24 and returns to the heat medium tank 84. The temperature sensor 98-1 detects the temperature of the heat medium M on the outlet side of the heat medium heat exchange pipe 12-1. Further, the low-temperature heat medium M circulates from the mixing valve 96-2 through the circulation path 88-13 to the low-temperature heating load 92-2 and returns to the heat medium tank 84. A branch 94-2 is formed in the circulation path 88-11 between the distribution valve 96-1 and the mixing valve 96-2. A high-temperature heat medium M circulates from the branch portion 94-2 to the high-temperature heating load 92-1 through the circulation path 88-14.

The bathtub water circulation path 88-3 is provided with an forward pipe 88-31 and a return pipe 88-32, and the bathtub water BW of the bathtub 89 is converted into the bathtub water of the first heat exchange section 6-1 by driving the circulation pump 90-2. It is circulated in the heat exchange pipe 14.

The water supply heat exchange pipe 16 of the third heat exchange section 6-3 is connected to the water supply channel 88-4, and the preheated water supply W flows through the pipeline 88-41 to the plate heat exchanger 24, and the plate heat is generated. After exchanging heat with the heat medium M in the exchanger 24, hot water is discharged from the hot water supply passage 88-5. A bypass passage 88-6 is branched between the water supply passage 88-4 and the hot water supply passage 88-5 via a mixing valve 96-3. The water supply W is mixed with the hot water HW by the opening degree of the mixing valve 96-3. The temperature of the water supply W is detected by the temperature sensor 98-2, the outlet temperature of the plate heat exchanger 24 is detected by the temperature sensor 98-3, and the hot water temperature is detected by the temperature sensor 98-4. The amount of water supplied by the water supply W is detected by the water supply amount sensor 98-5. When starting hot water supply, refer to the amount of water supply, water supply temperature, and hot water temperature immediately after heat exchange, and after starting hot water supply, refer to the hot water discharge temperature, and the mixing valve 96-3 is controlled, and the hot water HW immediately after heat exchange. The mixing ratio of the water supply W is adjusted. As a result, hot water HW controlled to a set temperature can be discharged.

A branch portion 94-3 is provided in the hot water supply passage 88-5, and a hot water injection pipe 88-8 is connected between the hot water supply passage 88-5 and the return pipe 88-32 of the circulation passage 88-3. From 88-8, hot water HW is poured into the return pipe 88-32 of the circulation path 88-3 via the hot water pouring solenoid valve 96-5. That is, at the time of pouring the bathtub, the pouring solenoid valve 96-5 is opened, and the hot water HW heated by the heat medium M is poured into the bathtub 89. The pouring amount of this hot water HW is detected by the pouring amount sensor 98-6.

Fuel gas G is supplied to the burner 8 from the fuel supply pipe 43. The supply and amount of fuel gas G to the burner 8 are controlled by the fuel control valve 96-4.

The drain D generated in the second heat exchange section 6-2 and the third heat exchange section 6-3 is received by the drain receiver 54, guided to the drain tank 97 through the drain pipe 88-7, and stored according to the stored amount. Is discharged from the discharge pipe 88-9.

An electrical board 100 is provided, and the electrical board 100 receives a commercial AC power supply at the power supply unit 102, and a power output is supplied to the electrical board 100. The electrical board 100 is provided with a hot water supply / reheating / heating control unit 104 (FIG. 8), and remote controller devices 106-1, 106-2, and 106-3 are connected to the electrical board 100.

<Control system>

FIG. 8 shows an example of the hot water supply / reheating / heating control unit 104. In the configuration shown in FIG. 8, a functional unit necessary for explaining the function as the embodiment is described, and the present invention is not limited to such a functional unit.

The hot water supply / reheating / heating control unit 104 and the remote controller devices 106-1, 106-2, 106-3 are composed of a computer, and realize the control mode described later by information processing. The processor 108 executes a program in the memory unit 110 to execute information processing and data storage necessary for controlling hot water supply, reheating, and heating.

The memory unit 110 includes a recording medium such as a ROM (Read-Only Memory) and a RAM (Random-Access Memory), and stores a program for executing information processing necessary for control. In addition to ROM, a non-volatile recording medium such as EEPROM (Electrically Erasable Programmable Read-Only Memory) may be used. RAM constitutes an information processing work area.

The system communication unit 112 is controlled by the processor 108, cooperates with the remote controller devices 106-1, 106-2, and 106-3 by wire or wirelessly, and executes information exchange with these remote controllers 106-1, 106-2, and 106-3.

The input / output unit (I / O) 114 takes out input information to be used for information processing of the processor 108 and control output which is a processing result. The I / O 114 includes circulation pumps 90-1, 90-2, distribution valve 96-1, mixing valves 96-2, 96-3, temperature sensors 98-1, 98-2, 98-3, 98-4, A water supply amount sensor 98-5, a fuel control valve 96-4, a hot water pouring solenoid valve 96-5, and the like are connected.

<Drive control of hot water supply / reheating / heating device 80>

The hot water supply / reheating / heating device 80 includes hot water supply operation, reheating operation, heating operation, etc., and these operations include pump rotation speed control, burner combustion control, hot water supply control, bath water pouring control, and the like. ..

9 and 10 show an example of a processing procedure for driving control of the hot water supply / reheating / heating device 80. In FIGS. 9 and 10, common reference numerals a and b indicate connectors between flowcharts.

In this processing procedure, it is determined whether or not any of the functions is in the ON state. If none of the functions is in the ON state (NO in S101), the standby state is maintained.

If any of the functions is in the ON state (YES in S101), it is determined whether the reheating independent operation is performed (S102). If the reheating alone operation is performed (YES in S102), the circulation pump 90-1 is driven at a predetermined rotation speed required for reheating as the rotation speed control of the circulation pump 90-1 (S103), and the process proceeds to S107.

Even if any of the functions is in the ON state (YES in S101), if it is not the reheating independent operation (NO in S102), it is determined whether the hot water supply alone operation or the hot water supply and reheating operation is performed (S104). In the case of hot water supply independent operation or hot water supply and reheating operation (YES in S104), the circulation pump 90-1 is set to a rotation speed that secures the flow rate of the heat medium M at a predetermined temperature, for example, 80 [° C.], which matches the required number. (S105) and shift to S107.

Unless it is a hot water supply independent operation or a hot water supply and reheating operation (NO in S104), the circulation pump 90-1 is driven to a rotation speed according to the combination of functions to be used (S106), and the process proceeds to S107.

In S107, the combustion control of the burner 8 is performed so that the temperature detected by the heat medium M by the temperature sensor 98-1 is a predetermined temperature, for example, 80 [° C.].

In the bathtub pouring or hot water supply, after S107, it is determined whether or not there is bathtub pouring or hot water supply (S108). When there is bathtub pouring or hot water supply (YES in S108), it is determined whether bathtub pouring alone or not (S109). If the bathtub pouring alone is used (YES in S109), the mixing valve 96-3 is controlled so that the detection temperature of the temperature sensor 98-4 is, for example, the set temperature of the bathtub-the amount of heat generated by the reheating heat exchange (YES in S109). S110), shift to S114.

In S109, if it is not the bathtub pouring alone (NO in S109), it is determined whether the hot water is supplied alone (S111). If the hot water supply is independent (YES in S111), the mixing valve 96-3 is controlled so that the hot water outlet temperature becomes the hot water supply set temperature, that is, the detection temperature of the temperature sensor 98-4 becomes the hot water supply set temperature (YES). S112).

In S111, if hot water supply alone is not performed (NO in S111), control corresponding to bathtub pouring and hot water supply is performed (S113).

In the reheating operation (FIG. 10), it is determined whether or not there is a reheating operation (S114), and if it is a reheating operation (YES in S114), the reheating side circulation pump 90-2 is driven (S115). If it is not a reheating operation (NO in S114), the drive of the reheating side circulation pump 90-2 (S115) is skipped.

In the high-temperature heating operation, it is determined whether or not there is a high-temperature heating operation (S116), and if it is a high-temperature heating operation (YES in S116), the high-temperature heating operation is performed (S117). If it is not the high temperature heating operation (NO in S116), the high temperature heating operation (S117) is skipped.

In the low-temperature heating operation, it is determined whether or not there is a low-temperature heating operation (S118), and if it is a low-temperature heating operation (YES in S118), the low-temperature heating operation is performed (S119). If it is not the low-temperature heating operation (NO in S118), the low-temperature heating operation (S119) is skipped and this process ends.

<Effect of Example 2>

According to the second embodiment, the following effects can be obtained.

In the rotation speed control of the circulation pump 90-1, the flow rate of the heat medium M changes according to the rotation speed of the pump. This pump control is basically FF (feedforward) control, and can be controlled to a hot water supply amount, high temperature heating or low temperature heating, and a rotation speed according to the number of connected heating terminals. In the reheating independent operation, the heat medium M is circulated at a predetermined rotation speed in order to prevent the heat medium M from boiling. In this case, the heat medium M is circulated in the device through the circulation path 88-2 via the plate heat exchanger 24. If it is not a reheating independent operation, it depends on the pump rotation speed according to other functions. The rotation speed of the circulation pump 90-2 on the reheating side may be controlled by the amount of combustion of the burner 8.

In the hot water supply (including hot water injection) independent operation or the reheating operation performed at the same time as the hot water supply, the detection temperature of the water supply W of the temperature sensor 98-2, the detection value of the water supply amount sensor 98-5, and the set temperature of the hot water supply or the hot water injection are used. The number of combustions (combustion amount) required for heating is calculated, and the number of rotations of the circulation pump 90-1 is obtained from the flow rate of the heat medium M at a set temperature, for example, 80 [° C.] according to this number, and the circulation pump 90 Control -1. As a result, it is not necessary to heat the heat medium M more than necessary, so that inconveniences such as suspension of combustion can be prevented.

In the combustion control, the combustion amount of the burner 8 is controlled so that the heat medium M reaches a predetermined temperature, for example, 80 [° C.] while the circulation pump 90-1 is being driven. In this case, the pump drive may be a control condition, and a flow rate sensor is not required in the heat medium circuit.

Regardless of the flow rate of the heat medium M flowing through the heat exchanger 22, the amount of gas may be adjusted so that the detection temperature of the temperature sensor 98-1 becomes a predetermined temperature, for example, 80 [° C.]. In this case, if the temperature on the outlet side of the heat medium tank 84 is close to the predetermined temperature of the heat medium M, the burner combustion may be stopped.

In bathtub pouring or hot water supply, the presence or absence of hot water supply can be detected by the water supply amount sensor 98-5. Whether or not the bathtub pouring is independent may be determined by comparing the detected values of the water supply amount sensor 98-5 and the pouring amount sensor 98-6. If there is a difference in this detected value, it can be seen that hot water supply and hot water pouring are used at the same time.

In the pouring alone, the hot water HW whose temperature was detected by the temperature sensor 98-4 flows from the pouring pipe 88-8 to the circulation path 88-3, and is poured into the bathtub 89 by the outbound pipe 88-31 and the return pipe 88-32. It is hot water. In this case, when passing through the going pipe 88-31, it is heated by the bathtub water heat exchange pipe 14, so in consideration of this heating amount, refer to the detection temperature of the temperature sensor 98-4, and set the hot water temperature of the bathtub 89. The mixing valve 96-3 is controlled so as to have a lower predetermined temperature.

In the hot water supply alone, the detection temperature of the temperature sensor 98-4 is monitored, and the mixing valve 96-3 is controlled so that the hot water discharge temperature becomes the hot water supply set temperature.

When hot water pouring and hot water supply occur at the same time, control for simultaneous use is performed, at least the detection temperature of the temperature sensor 98-4 is monitored, and the mixing valve 96-3 is used so that the temperature required for the hot water HW can be obtained. You just have to control it.

In the reheating operation, the circulation pump 90-2 on the reheating side is driven and the circulation pump 90-1 is driven so that the heat medium M of the heat medium heat exchange pipe 12-1 can be controlled so as not to become hot.

In the high-temperature heating operation, the distribution valve 96-1 can be controlled to circulate the high-temperature heat medium M through the high-temperature heating load 92-1.

In the low-temperature heating operation, the mixing valve 96-2 can be controlled to control the temperature of the heat medium M circulating in the low-temperature heating load 92-2 to an appropriate value.

[Other Embodiments]

A) In the above-described embodiment or Examples 1 and 2, an example is shown in which the water supply heat exchange pipe 16 of the third heat exchange unit 6-3 is arranged so as to project on the second heat exchange unit 6-2 side. As shown in FIG. 11, only the heat medium heat exchange pipe 12-2 that recovers the apparent heat from the combustion exhaust EG that has passed through the first heat exchange section 6-1 is installed in the second heat exchange section 6-2. Only the water supply heat exchange pipe 16 may be installed in the third heat exchange section 6-3. The heat exchange efficiency can also be improved by such a configuration.

B) In the above embodiment, the water heater has been illustrated as a heat source machine, but the present invention is not limited to the water heater. In addition to gas combustion accompanied by air supply and exhaust, the present invention can be similarly applied to combustion control of liquid fuel.

C) In the above embodiment, the second heat exchange unit 6-2 and the third heat exchange unit 6-3 are independently configured as a single heat exchange unit, and this heat exchange unit is used as the first housing unit 28-. It may be configured to be detachable from 1.

D) A ventilation unit may be provided on the side of the second heat exchange unit to allow the combustion exhaust EG to flow in advance to the third heat exchange unit 6-3.

As described above, the most preferable embodiment of the technique of the present invention has been described. The present invention is not limited to the above description. Various modifications and modifications can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the form for carrying out the invention. Needless to say, such modifications and modifications are included in the scope of the present invention.

According to the present invention, for example, a heat medium can be used as a heat source for heating and hot water supply, and can be used for a one-can, three-water type heat source machine that heats bath water by primary heat exchange, and the heat of combustion exhaust can be used as a heat medium or the like. It can be used for heat exchange to improve heat exchange efficiency.

2 Heat exchanger 4 Housing 6-1 1st heat exchange part 6-2 2nd heat exchange part 6-3 3rd heat exchange part 8 Burner 10 Exhaust part 12-1 Heat medium heat exchange pipe 12-2 Heat medium heat Exchange pipe 14 Bath water heat exchange pipe 16 Water supply heat exchange pipe 20 Heat source machine 22 Heat exchanger 24 Plate heat exchanger (4th heat exchange section)
26 Main body case part 26-1 Main body cover part 26-2 Upper cover part 28-1 First housing part 28-2 Second housing part 28-3 Third housing part 30 Fan 32 Fan motor 34 Exhaust pipe part 36 Air-fuel mixture ejection part 38-1, 38-2 Air-fuel mixture ejection nozzle 40-1, 40-2 Air-fuel mixture introduction part 42 Ignite 43 Fuel supply pipe 44 Frame rod 46 Space part 48 Heat absorption fin 50 Inclined plate 52 Bottom plate 54 Drain receiver 56 Ventilation window 58 Shielding plate 62 Distribution valve 64-1 Entering port 64-2 Outer port 66 Heat medium line 68-1 Entering port 68-2 Outer port 70-1 Entering port 70-2 Outer side Port 72 Exhaust port 74-1 Inlet port 74-2 Outlet port 80 Hot water supply / reheating / heating device 82 Equipment housing 84 Heat medium tank 88-1, 88-2, 88-3, 88-11, 88 -12, 88-13, 88-14 Circulation route 88-4 Water supply route 88-5 Hot water supply route 88-6 Bypass route 88-7 Drain pipe 88-8 Pouring pipe 88-9 Discharge pipe 88-31 Outgoing pipe 88- 32 Return pipe 88-41 Pipe line 89 Bathtub 90-1, 90-2 Circulation pump 92-1 High temperature heating load 92-2 Low temperature heating load 94-1 Branch 94-2 Branch 94-3 Branch 96-1 Distribution Valve 96-2 Mixing valve 96-3 Mixing valve 96-4 Fuel control valve 96-5 Hot water pouring electromagnetic valve 97 Drain tank 98-1 Temperature sensor 98-2, 98-3, 98-4 Temperature sensor 98-5 Water supply amount Sensor 98-6 Hot water injection amount sensor 100 Electrical board 102 Power supply unit 104 Hot water supply / reheating / heating control unit 106-1, 106-2, 106-3 Remote control device 108 Processor 110 Memory unit 112 System communication unit 114 Input / output unit

Claims (5)

A first housing unit that houses the first heat exchange unit that exchanges heat between the combustion exhaust and the heat medium, and
A second heat exchange unit that is adjacent to the first housing portion and exchanges heat between the combustion exhaust and the heat medium flowing in from the first housing portion, and a third that exchanges heat between the combustion exhaust and the water supply. A second housing that houses the heat exchange and
An inclined plate provided between the ceiling portion of the first housing portion and the bottom portion of the second housing portion and inclining the bottom portion of the second housing portion.
A ventilation window portion formed on the inclined plate and guiding the combustion exhaust gas from the first housing portion to the inside of the second housing portion.
A shielding plate that is provided so as to project from the inclined plate to the ventilation window portion and has a larger inclination than the inclined plate.
A heat exchanger characterized by being equipped with. The heat exchanger according to claim 1, wherein the shielding plate covers the bottom of the second heat exchange section or the third heat exchange section that projects toward the ventilation window portion. The second housing portion has a drain receiver protruding from the side surface side of the first housing portion, and drains generated from either or both of the second heat exchange portion and the third heat exchange portion. The heat exchanger according to claim 1 or 2, wherein the heat exchanger is introduced into the drain receiver by flowing along the shielding plate and the inclined plate. The second heat exchange unit and the third heat exchange unit are arranged in the second housing portion in parallel with the flow direction of the combustion exhaust or adjacent in the direction perpendicular to the combustion exhaust. The heat exchanger according to any one of claims 1 to 3, wherein the heat exchanger is characterized in that. A first housing unit that houses a first heat exchange unit that exchanges heat between the heat medium that circulates in the heat medium circuit or the bathtub water that circulates in the reheating circuit and the combustion exhaust gas.
A second heat exchange unit that is adjacent to the first housing portion and exchanges heat between the combustion exhaust that flows in from the first housing portion and the heat medium that circulates in the heat medium circuit, and a hot water supply circuit are provided. A second housing unit that houses the water supply flowing through the hot water supply circuit and the third heat exchange unit that exchanges heat with the combustion exhaust.
An inclined plate provided between the ceiling portion of the first housing portion and the bottom portion of the second housing portion and inclining the bottom portion of the second housing portion.
A ventilation window portion formed on the inclined plate and guiding the combustion exhaust gas from the first housing portion to the inside of the second housing portion.
A shielding plate that is provided so as to project from the inclined plate to the ventilation window portion and has a larger inclination than the inclined plate.
A heat source machine characterized by being equipped with.

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