JPH0989474A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a heat absorbing section small and reduce temperature drop of combustion gas in order to prevent condensation on a surface of a heat absorbing pipe from occurring by making a jointing pipe protrude from a surface other than a surface through which a heat absorbing pipe of the heat absorbing section passes. SOLUTION: A main part 29 of two jointing pipes 28 is arranged in parallel with a heat absorbing pipe outwardly of a face of the heat absorbing section 2 other than that through which the heat absorbing pipe is made to pass, and approximately 'U' shaped bent portions 30 formed at both ends of the main part 29 are formed to constitute the jointing pipe 28 which is longer than another jointing pipe 26. A finishing end of a third heat absorbing pipe from a starting end side of a heat absorbing passage 27 is communicatively connected to a starting end of a third heat absorbing pipe from a finishing end side by means of the jointing pipe 28. A supplementary heat absorbing pipe 40 is wound around and in contact with outer peripheral surfaces of outer walls 24 of a combustion space below the heat absorbing section 2, a finishing end of a water supply pipe is communicatively connected to a starting end of the supplementary heat absorbing pipe 40, a finishing end of the supplementary heat absorbing pipe 40 is communicatively connected to the starting end of the heat absorbing passage 27 and a finishing end of the heat absorbing passage 27 is communicatively connected to a starting end of a hot water discharging pipe, so that a series of passages are formed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to heat exchangers.

[0002]

2. Description of the Related Art Conventionally, in a device for heating a fluid in a flowing state such as a water heater, as shown in FIGS. 17 to 19, a heating device a such as a burner is passed through a number of fins b to form a meandering shape. A heat exchanger e composed of the arranged heat absorption pipe d is communicated, and an auxiliary heat absorption pipe h wound in contact with the outer wall g of the heating device a is wound between the heat absorption pipe d and the water supply pipe f. , The hot water outlet pipe j is connected to the downstream side, and first, the auxiliary heat absorbing pipe h preheats the water flowing in from the water supply pipe f and cools the outer side wall g of the heat exchanger e, and then the preheated water is While flowing in the endothermic pipe d, the hot gas is heated by the combustion gas from the heating device a to form high-temperature hot water, which is sent from the hot water discharge pipe j to an external hot water supply destination.

Further, a bypass pipe k is provided between the water supply pipe f and the hot water discharge pipe j so that they are communicated with each other, so that the surface temperature of the heat absorption pipe d is kept high, so that the water in the combustion gas absorbs water. Prevents condensation on the surface of 25.

[0004]

However, the above-described conventional heat exchanger e has the following problems.

[0007] In order to improve the performance of re-spouting hot water after the hot water is temporarily stopped, it is necessary to increase the volume of the endothermic tube d (increase the heat capacity). It is necessary to increase or increase the length L of the fin b, which causes a problem of increasing the size of the heat exchanger e.

[0006] Further, there is a problem that the so-called after-boiling is large, in which the hot water staying in the endothermic tube d and excessively heated by the residual heat of the high temperature fins b and other members flows out at the initial stage of re-melting. .

In the heat exchanger e in which the bypass pipe k is provided between the water supply pipe f and the hot water discharge pipe j, the amount of water flowing through the heat absorption pipe d decreases and the water temperature in the heat absorption pipe d rises excessively. There is a problem that it cannot be made large and the effect of preventing dew condensation is insufficient.

Since the bypass pipe k is branched upstream of the auxiliary heat absorption pipe h, if the bypass amount is increased, the outer wall g of the heat exchanger e is insufficiently cooled, and the deterioration of the outer wall g is accelerated. There's a problem.

When post-purge is performed when the combustion of the heating device is stopped, there is also a problem that the water in the endothermic tube d is cooled and the outlet water temperature is lowered, contrary to the above.

[0010]

According to the present invention, there are provided a plurality of heat absorbing tubes which penetrate a heat absorbing portion containing a heating device, and a coupling pipe which connects the plurality of heat absorbing tubes to each other outside the heat absorbing portion. , In a heat exchanger in which a water supply pipe and a hot water discharge pipe are respectively connected to both ends of a plurality of heat-absorbing pipes that are connected in communication, at least one coupling pipe is projected to a surface different from the surface through which the heat-absorbing pipe of the heat-absorbing portion penetrates. It is intended to provide a heat exchanger characterized by being a specific coupling tube.

It also has the following features.

In the heat exchanger, at least one of the coupling tubes is a specific coupling tube having a diameter larger than that of the heat absorbing tube.

In the above heat exchanger, at least one of the connecting pipes is a specific connecting pipe having a larger diameter or longer than other connecting pipes.

The specific connecting pipe is formed in the second and subsequent connecting pipes from the upstream side.

The specific connecting pipe is formed in the most downstream connecting pipe.

In a heat exchanger that heats a fluid having the same flow rate by a plurality of endothermic tubes arranged so as to have different distances from the heating device, the diameter of the endothermic tube far from the heating device is set to the heating device. It should be larger than the diameter of the endothermic tube that is close to.

The water supply pipe and the hot water discharge pipe are respectively connected to both ends of the heat absorbing pipe that penetrates the heat absorbing unit containing the heating device, and the outer wall of the heat absorbing unit is contacted between the water supplying pipe and the heat absorbing pipe. In the heat exchanger with the wound auxiliary heat absorption tube interposed, the midway portion or the end portion of the auxiliary heat absorption tube and the hot water discharge pipe are
The communication was made via a bypass pipe.

A water supply pipe and a hot water discharge pipe are respectively connected to both ends of a heat absorbing pipe which penetrates the heat absorbing portion containing a heating device, and the outer wall of the heat absorbing portion is contacted between the water supplying pipe and the heat absorbing pipe. In a heat exchanger with a wound auxiliary heat absorption pipe interposed, the hot water pipe is connected to the middle or end of the auxiliary heat absorption pipe via a bypass pipe and the end of the water supply pipe and the auxiliary heat absorption of the hot water pipe. The upstream side of the confluence point with the pipe was communicated via an auxiliary bypass pipe.

[0019]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a water heater B having a heat exchanger A according to the present invention. The water heater B has a heat absorbing portion 2 arranged in a case 1 having a substantially rectangular box shape. The heat absorbing part 2 has a burner 4 as a heating device 3 arranged at the lower part thereof, and the heat absorbing part 2 arranged above the burner 4.

In the figure, 5 is a fan for supplying air to the burner 4, 6 is a gas pipe, 7 is a gas proportional valve, 8 is a manifold, 9 is a water supply pipe, 10 is a flow sensor, 11 is a hot water pipe, 12
Is a hot water temperature sensor, 13 is a control device, and 14 is an exhaust port.

The heat absorbing portion 2 is, as shown in FIGS. 1 and 2,
A combustion space 21 of the burner 4 is formed below the inside of a substantially rectangular tubular casing 20, and a heat exchange portion 22 is arranged above the combustion space 21. fin
A plurality of fins 23 (for example, 8 which penetrate the fins 23 and the outer walls 24, 24 of the heat absorbing portion 2 and have both ends thereof projected to the outside).
The heat absorbing pipes 25) are arranged, and the end portions of the heat absorbing pipes 25 are connected and connected by a plurality of coupling pipes 26 each bent into a substantially U shape.
A series of heat absorption channels 27 are formed.

Next, a description will be given of a first embodiment in which at least one of the coupling pipes 26 is exposed to the outside of the heat absorbing portion 2 as a specific coupling pipe 28 protruding on a different surface of the heat absorbing portion 2.

In the first embodiment, as shown in FIGS. 2 and 3, the main portion 29 of the two specific coupling pipes 28 is provided outside the heat absorbing portion 2.
Is arranged in parallel to the heat absorbing tube 25 outside the side surface of the heat absorbing section 2 through which the heat absorbing tube 25 penetrates, and the substantially U-shaped bending portions 30 and 30 formed at both ends of the main section 29 are provided. A specific coupling pipe 28 that is longer than the other coupling pipe 26 is formed, and from the end of the endothermic pipe 25 that is third from the start end side of the heat absorption flow path 27 and from the end side through the specific coupling pipe 28. The starting end of the third endothermic tube 25 is connected for communication. It is also possible to provide a plurality of specific coupling pipes 28 at the joints between the heat absorbing pipes 25.

Further, the auxiliary heat absorption tube 40 is wound in contact with the outer peripheral surface of the outer wall 24 of the combustion space below the heat absorbing portion 2,
The end of the water supply pipe 9 is connected to the starting end of the auxiliary heat absorbing pipe 40, the end of the auxiliary heat absorbing pipe 40 is connected to the starting end of the heat absorbing passage 27, and the end of the heat absorbing passage 27 is connected to the starting end of the hot water outlet pipe 11. To form a series of flow paths.

With this structure, while the water flowing from the water supply pipe 9 flows through the auxiliary heat absorption pipe 40, it is preheated by the outer wall 24 of the high temperature heat absorption part 2 to enhance the thermal efficiency, and the outer wall
The durability of the outer wall 24 can be enhanced by cooling the outer wall 24.

Further, the controller 13 controls the hot water temperature sensor.
By performing feedback control of the gas proportional valve 7 based on the outlet heated water temperature signal from 12, the outlet heated water temperature can be maintained at a preset temperature.

FIG. 4 shows the temporal change of the hot water discharge temperature when the hot water discharge is temporarily stopped and the hot water discharge is restarted immediately in the first embodiment. The solid line shows the 6-pass endothermic tube 25 in 2 passes. In this embodiment, the specific joining pipe 28 is connected to form 8 passes, the dashed line shows the conventional example having the 8-pass heat absorbing pipe 25, and the broken line shows the change in tap water temperature of the 6-pass absorbing pipe 25. There is.

That is, in general, the peak of rise in tapping temperature due to post-boiling is represented by the following equation.

[0030] However, Tmax: peak of rising temperature of hot water due to post-boiling Ts: preset temperature of hot water Th: hot water temperature inside heat absorbing pipe when hot water is stopped Tc: temperature of incoming water from water supply pipe H: residual heat from heat absorbing pipe In the embodiment, the first side on the right side of the above equation
Although the term is the same as the conventional one having an 8-pass heat absorption tube, since the specific coupling tube 28 is provided outside the heat absorption section 2, the residual heat from the heat absorption tube of the second term becomes small, and the tapping temperature The rising peak Tmax can be suppressed to almost the same level as in the conventional example having a 6-pass heat absorption tube.

Further, the peak Tmin of the outlet heated water temperature decrease after the above-mentioned peak Tmax is generated is the endothermic flow path including the specific coupling pipe 28.
Since the hot water in the endothermic flow path 27 is discharged during the period from the restart of hot water until the burner 4 of the heating device 3 is ignited, the peak Tmin of the hot water temperature decrease Can be suppressed to about the same level as the conventional example having 8 passes.

In FIGS. 5 to 8, the diameter D1 of the coupling pipe 26 that connects the heat absorbing pipes 25 to each other outside the heat absorbing portion 2 is shown as
The specific coupling pipe 28 having a diameter larger than the diameter D is provided in the heat absorption flow path 27.

FIG. 5 shows a second embodiment in which all the connecting portions of the heat absorbing pipes 25 are connected to each other by a specific coupling pipe 28. The specific coupling pipe 28 has a long pipe length or a large diameter. Since the capacity of the heat absorption channel 27 can be increased by the amount, the capacity of the heat absorption channel 27 can be maintained even if the number of passes of the heat absorption tube 25 is reduced. Since the fin 23 is located outside and does not penetrate the fin 23, the length L of the fin 23 can be shortened, and the heat absorbing portion 2 can be downsized in combination with the decrease in the number of passes of the heat absorbing tube 25. it can.

Since the number of endothermic tubes 25 has decreased,
The decrease in the combustion gas temperature is reduced, and dew condensation on the surface of the heat absorption tube 25 can be prevented.

Further, when the hot water is again tapped after the hot water is temporarily stopped, since the specific coupling pipe 28 is in a position where it is not heated by the combustion gas, there is no rise in the hot water temperature due to post-boiling, and the endothermic passage 27 Due to its large capacity, it can handle a large amount of hot water.

FIG. 6 shows a third embodiment in which the heat absorption tubes 25 on the most upstream side are connected to each other by a specific coupling tube 28.
When all the connection parts are the specific coupling pipes 28, the capacity of the heat absorption flow path 27 is prevented from becoming too large and the response of the hot water is prevented from being deteriorated.

FIG. 7 shows a fourth embodiment in which the second and subsequent connecting portions from the most upstream side are connected and connected by a specific coupling pipe 28, and FIG. 8 shows the fifth downstream connection as the fifth embodiment. It shows that the parts are connected by a specific coupling pipe 28, and since the water temperature at the end part of the endothermic flow path 27 is higher, the heat storage amount can be increased relative to the volume of the endothermic flow path 27, so the responsiveness It is possible to improve the hot water discharge property without lowering the water temperature.

6 and 7, the specific coupling pipe is
28 is formed to have a larger diameter and longer than the other coupling pipe 26, but at least one of the larger diameter and the longer length may be satisfied.

In this way, the low temperature hot water in the specific joint pipe 28 is mixed with the hot water staying in the endothermic tube 25 and excessively heated, so that the rise of the hot water temperature at the initial stage of re-hot water due to post-boiling is suppressed, As a result, it is possible to suppress undershoot, which tends to occur in normal feedback control.

FIG. 9 shows a sixth embodiment in which a specific endothermic pipe 43 having a diameter larger than the diameter D of the other endothermic pipe 25 is arranged at a position far from the heating device 3 in the endothermic portion 2. The upper two endothermic tubes 25 farther from the heating device 3 out of the five endothermic tubes 25 have a larger diameter D2.

With this structure, the capacity of the heat absorption channel 27 is increased to enhance the hot water discharge performance, and the flow velocity of water in the specific heat absorption tube 43 having a large diameter D2 is slowed down. Therefore, as shown in FIG. It is possible to keep the surface temperature of 43 high, and to prevent dew condensation on the surface of the heat absorption tube at a position far from the heating device 3 where dew condensation is likely to occur. Note that FIG.
Medium, ●, □, and ▲ represent the paths of the present embodiment, the conventional bypass hot water supply apparatus shown in FIG. 17, and the conventional bypass hot water supply apparatus shown in FIG. 17, respectively. The endothermic tube surface temperature is shown.

FIG. 11 shows, as a seventh embodiment, one of the six heat absorbing tubes 25 in which only one specific heat absorbing tube 43 is arranged at a position where dew condensation is most likely to occur. That is, the specific endothermic pipe 43 is arranged at a position far from the heating device 3 and in contact with the coldest endothermic pipe 25 located at the start end of the endothermic flow path 27 and the combustion gas temperature becomes the lowest. is there.

FIG. 12 and FIG. 13 show an eighth embodiment.
A bypass pipe 45 is provided between the end of the auxiliary heat absorption pipe 40 and the hot water discharge pipe 11.
Shows that they are connected by communication.

With this configuration, since the low temperature water from the water supply pipe 9 flows into the auxiliary heat absorption pipe 40, the outer wall 24 of the heat absorption portion 2
Is sufficiently cooled, the durability of the outer side wall 24 can be enhanced, and the water flowing through the auxiliary heat absorbing tube 40 also contributes to heat absorption, so that the thermal efficiency can be enhanced.

In particular, the water in each endothermic pipe 25 is cooled to a low temperature by the post-purge performed when the combustion of the heating device 3 is stopped and the pre-purge performed when the combustion is started. It will decrease,
Since the auxiliary heat absorption pipe 40 is not exposed to the purge air, it retains a high temperature, and the hot water in the auxiliary heat absorption pipe 40 mixes with the low temperature water from the heat absorption pipe 25 at the time of re-leaving hot water, so that the above-mentioned tapping temperature decrease Can be suppressed.

FIG. 14 shows the temperature of the water in the endothermic tube 25 and the temperature of the water in the auxiliary endothermic tube 40 from the suspension of hot water discharge to the re-spouting of hot water in the eighth embodiment.
The temperature of the water in 25 and the auxiliary heat absorption pipe 40 rises for a certain period of time T after the hot water is stopped due to the delay in the operation of the gas proportional valve 7, and then the temperature of the water in the water supply pipe 9 drops rapidly due to the above-mentioned purging or the like. However, since the temperature of the water in the auxiliary heat absorption tube 40 is not exposed to the purge air, the temperature decrease is slow.

There is a possibility that the hot water outlet temperature overshoots during the above-mentioned fixed time T. This is because the bypass amount is increased or the bypass pipe 45 is lengthened to cause a time lag of water outflow in the auxiliary heat absorption pipe 40. Can be prevented by increasing.

FIG. 15 shows, as a ninth embodiment, in addition to the bypass pipe 45, the end of the water supply pipe 9 and the upstream side of the confluence of the auxiliary heat absorbing pipe 40 and the hot water discharge pipe 11 of the hot water discharge pipe 11 are auxiliary. It is shown that they are communicated with each other via a bypass pipe 46.

With this configuration, when hot water is temporarily discharged again after the hot water is temporarily stopped, water from the water supply pipe 9 flowing in through the auxiliary bypass pipe 46 is mixed with the high-temperature hot water staying at the end of the heat absorption passage 27. As shown in FIG. 16, it is possible to prevent hot water having a temperature higher than the set temperature from coming out,
Furthermore, the undershoot can be suppressed by mixing the hot water staying in the auxiliary heat absorption tube 40 with the time lag into the hot water whose temperature is lower than the set temperature due to the undershoot.

[0050]

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

A plurality of endothermic tubes penetrating the endothermic section having a built-in heating device and a coupling tube for connecting the plurality of endothermic tubes to each other outside the endothermic section are provided, and both ends of the plurality of endothermic tubes connected in communication are connected. In the heat exchanger in which the water supply pipe and the hot water discharge pipe are connected to each other, at least one coupling pipe is
To increase the capacity of the heat absorption flow path by the amount that the specific coupling pipe protruding to the surface different from the surface through which the endothermic pipe of the heat absorbing part penetrates, or the same coupling pipe is used as the specific coupling pipe to lengthen the pipe length or increase the diameter. Therefore, even if the number of passes of the heat absorption tube is reduced, the capacity of the heat absorption channel can be maintained.Furthermore, since the specific coupling pipe is located outside the heat absorption part and does not penetrate the fin, The length can be shortened, and the heat absorbing portion can be downsized in combination with the decrease in the number of passes of the heat absorbing tube.

Further, since the number of heat absorbing tubes is reduced, the decrease of the combustion gas temperature is reduced, and the dew condensation on the heat absorbing tube surface can be prevented.

In particular, when the hot water is discharged again after the hot water is temporarily stopped, it is possible to prevent the hot water temperature from rising due to post-boiling and the subsequent hot water temperature decrease.

That is, generally, the peak of the rise in tapping water temperature due to post-boiling is represented by the following equation.

[0055] However, Tmax: peak of rise in hot water temperature due to post-boiling Ts: preset hot water temperature Th: hot water temperature inside heat absorption tube when hot water is stopped Tc: temperature of incoming water from water supply tube H: residual heat from heat absorption tube However, in the present invention, Even if the first term on the right side of the above equation is equal to the conventional one having the same number of passes, since the specific coupling pipe is provided outside the heat absorbing portion, the residual heat from the heat absorbing pipe of the second term is small. The peak Tmax of the outlet heated water temperature rise due to the post-boiling of the number of passes obtained by subtracting the number of passes of the specific coupling pipe from the total number of passes, and the peak Tmax can be suppressed low regardless of the increase in the number of passes.

Further, the peak Tmin of the outlet heated water temperature decrease after the occurrence of the peak Tmax depends on the length of the heat absorption passage including the specific coupling pipe from the endothermic pipe inlet to the endothermic pipe outlet. During the period in which the burner of the heating device does not receive heat until ignition, the hot water in the endothermic channel flows out, so that the peak Tmin of the temperature of the hot water discharge can be suppressed to a temperature commensurate with the total number of passes.

Further, at least one of the coupling pipes is an extended coupling pipe longer than other coupling pipes, or a specific coupling pipe having a diameter larger than that of other coupling pipes is used, so that the heat absorption flow is increased. The hot water discharge performance can be improved by increasing the capacity of the passage.

Since the specific coupling pipe is formed in the second and subsequent coupling pipes from the upstream side and the specific coupling pipe is formed in the most downstream coupling pipe, the end portion of the heat absorption channel 27 is formed. Since the water temperature is higher, the amount of heat stored can be increased relative to the volume of the heat absorption flow path, so that the hot water output can be improved without lowering the responsiveness.

Further, since the number of heat absorbing tubes can be reduced, it is possible to reduce the decrease in combustion gas temperature and prevent dew condensation on the surface of the heat absorbing tubes.

Further, since the specific coupling pipe is in a position where it is not heated by the combustion gas, the capacity of the endothermic flow passage 27 is large at the time of re-releasing hot water after the hot water is temporarily stopped. be able to.

In a heat exchanger that heats a fluid having the same flow rate by a plurality of endothermic tubes arranged so as to have different distances from the heating device, the diameter of the endothermic tube far from the heating device is set to the heating device. By increasing the diameter of the endothermic tube closer to the end, the capacity of the endothermic flow path is increased to improve the hot water discharge performance, and the water velocity of the specific endothermic tube with a larger diameter is slower, so It is possible to keep the surface temperature high and prevent dew condensation on the surface of the heat absorbing tube at a position far from the heating device where dew condensation is likely to occur.

The water supply pipe and the hot water discharge pipe are respectively connected to both ends of the heat absorbing pipe that penetrates the heat absorbing unit containing the heating device, and the outer wall of the heat absorbing unit is contacted between the water supplying pipe and the heat absorbing pipe. In the heat exchanger with the wound auxiliary heat absorption tube interposed, the midway portion or the end portion of the auxiliary heat absorption tube and the hot water discharge pipe are
By communicating via the bypass pipe, while the water flowing from the water supply pipe flows through the auxiliary heat absorption pipe, it is preheated by the outer wall of the high temperature heat absorption part to improve the thermal efficiency and cool the outer wall. The durability of the outer wall can be increased.

In particular, the water in each endothermic tube is cooled to a low temperature by post-purging performed when combustion of the heating device is stopped or pre-purge performed at the start of combustion. Although it flows out and the hot water temperature drops,
Since the auxiliary endothermic tube is not exposed to the purge air, it retains a high temperature, and the hot water in the auxiliary endothermic tube mixes with the low temperature hot water from the endothermic tube when the hot water is re-exposed. You can

A water supply pipe and a hot water discharge pipe are respectively connected to both ends of a heat absorbing pipe which penetrates the heat absorbing portion containing the heating device, and the outer wall of the heat absorbing portion is contacted between the water supplying pipe and the heat absorbing pipe. In a heat exchanger with a wound auxiliary heat absorption pipe interposed, the hot water pipe is connected to the middle or end of the auxiliary heat absorption pipe via a bypass pipe and the end of the water supply pipe and the auxiliary heat absorption of the hot water pipe. By connecting the upstream side of the confluence with the pipe through the auxiliary bypass pipe, the auxiliary bypass pipe can be added to the high-temperature hot water staying at the end of the endothermic flow passage 27 at the time of re-melting after the temporary discharge of hot water. By mixing water from the water supply pipe that flows in through the pipe, it is possible to prevent hot water having a temperature higher than the set temperature from coming out, and further, to the hot water whose temperature has dropped below the set temperature due to undershoot, the auxiliary endothermic pipe Hot water staying inside By mixing provided a time lag, it is possible to suppress the undershoot.

[Brief description of drawings]

FIG. 1 is a front explanatory view showing a configuration of a water heater including a heat exchanger according to the present invention.

FIG. 2 is an explanatory perspective view showing a structure of a heat absorbing portion (first embodiment).

FIG. 3 is an explanatory view showing the arrangement of specific coupling pipes (first embodiment).

FIG. 4 is a graph showing temporal changes in tapping temperature during tapping again.

FIG. 5 is an explanatory view showing the arrangement of specific coupling pipes (second embodiment).

FIG. 6 is an explanatory view showing the arrangement of specific coupling pipes (third embodiment).

FIG. 7 is an explanatory view showing the arrangement of specific coupling pipes (fourth embodiment).

FIG. 8 is an explanatory view showing the arrangement of specific coupling pipes (fifth embodiment).

FIG. 9 is an explanatory view showing the arrangement of specific heat absorption tubes (sixth embodiment).

FIG. 10 is a graph showing the temperature of the endothermic tube surface of each path (6th
Example).

FIG. 11 is an explanatory view showing the arrangement of heat absorption tubes and specific heat absorption tubes (seventh embodiment).

FIG. 12 is an explanatory perspective view showing an arrangement of bypass pipes (eighth embodiment).

FIG. 13 is an explanatory view showing an arrangement of bypass pipes (eighth embodiment).

FIG. 14 is a graph showing a temporal change in water temperature of an endothermic tube and an auxiliary endothermic tube (eighth example).

FIG. 15 is an explanatory view showing the arrangement of bypass pipes (the ninth embodiment).

FIG. 16 is a graph showing a temporal change in tapping temperature (ninth example).

FIG. 17 is a perspective view showing a heat absorbing portion having a conventional structure.

FIG. 18 is an explanatory view showing the arrangement of heat absorption tubes having a conventional structure.

FIG. 19 is an explanatory view showing the arrangement of heat absorption tubes having a conventional structure.

[Explanation of symbols]

 A heat exchanger 2 heat absorbing part 3 heating device 9 water supply pipe 11 tapping pipe 24 outer wall 25 heat absorption pipe 26 coupling pipe 28 specific coupling pipe 40 auxiliary heat absorption pipe 45 bypass pipe 46 auxiliary bypass pipe

Claims (8)

[Claims] 1. A plurality of heat absorbing tubes (25) penetrating a heat absorbing section (2) containing a heating device (3) and the plurality of heat absorbing tubes (25) communicating with each other outside the heat absorbing section (2). A heat exchanger including a connecting pipe (26) to be connected, and a water supply pipe (9) and a hot water pipe (11) respectively connected to both ends of a plurality of heat-absorbing pipes (25) connected and connected.
In (A), connect at least one coupling pipe (26) to the heat absorption pipe (2) of the heat absorption section (2).
Specific coupling pipe (28) protruding on a surface different from the surface through which 5) penetrates
The heat exchanger characterized in that 2. A plurality of heat absorbing tubes (25) penetrating a heat absorbing section (2) containing a heating device (3) and the plurality of heat absorbing tubes (25) communicating with each other outside the heat absorbing section (2). In the heat exchanger (A), which has a connecting pipe (26) to be connected, and has a water supply pipe (9) and a hot water pipe connected to both ends of a plurality of heat-absorbing pipes (25) connected in communication, A heat exchanger characterized in that at least one of 26) is a specific coupling pipe (28) formed to have a diameter larger than that of the heat absorbing pipe (25). 3. A plurality of heat absorbing tubes (25) penetrating a heat absorbing section (2) containing a heating device (3) and the plurality of heat absorbing tubes (25) communicating with each other outside the heat absorbing section (2). In the heat exchanger (A), which has a connecting pipe (26) to be connected, and has a water supply pipe (9) and a hot water pipe connected to both ends of a plurality of heat-absorbing pipes (25) connected in communication, At least one of 26) and another coupling pipe (26)
A heat exchanger characterized by having a specific coupling pipe (28) having a diameter or length larger than that. 4. The heat exchanger according to claim 2, wherein the specific coupling pipe (28) is formed in the second and subsequent coupling pipes (26) from the upstream side. 5. The specific connecting pipe (28) is the most downstream connecting pipe (2).
The heat exchanger according to claim 1, wherein the heat exchanger is formed in 6). 6. A plurality of endothermic tubes (2) arranged so that fluids of the same flow rate are arranged at different distances from the heating device (3).
In the heat exchanger heated in 5), the diameter of the endothermic pipe (25) far from the heating device (3) was made larger than the diameter of the endothermic pipe (25) close to the heating device (3). A heat exchanger characterized by the above. 7. A water supply pipe (9) and a hot water supply pipe (11) are respectively connected to both ends of a heat absorbing pipe (25) which penetrates a heat absorbing portion (2) containing a heating device (3), and further, water supply is performed. Tube (9) and endothermic tube (25)
In the heat exchanger (A) in which the auxiliary heat absorption pipe (40) wound in contact with the outer wall (24) of the heat absorption part (2) is interposed between Connect the terminal end and the hot water pipe (11),
A heat exchanger characterized by being communicated via a bypass pipe (45). 8. A water supply pipe (9) and a hot water supply pipe (11) are respectively connected to both ends of a heat absorbing pipe (25) which penetrates a heat absorbing portion (2) containing a heating device (3), and moreover, water supply is performed. Tube (9) and endothermic tube (25)
In the heat exchanger (A) in which the auxiliary heat absorption pipe (40) wound in contact with the outer wall (24) of the heat absorption part (2) is interposed between Connect the terminal end and the hot water pipe (11),
The water pipe (9) as well as the communication through the bypass pipe (45)
The heat exchanger characterized in that the end of the hot water pipe and the upstream side of the confluence point of the hot water discharge pipe (11) with the auxiliary heat absorption pipe (40) are communicated with each other via the auxiliary bypass pipe (46).