JP7124335B2 - water heater - Google Patents

Description

The present invention relates to a water heater.

2. Description of the Related Art Conventionally, in a water heater, maintenance such as replacement of parts is performed. Further, for example, as an example of a water heater, a narrow type (slim type) water heater is described in Japanese Patent Application Laid-Open No. 2014-70801 (Patent Document 1). In the water heater disclosed in this publication, the front opening is closed with the front cover after the combustion block assembly is inserted into the inside of the instrument case through the front opening of the instrument case.

JP 2014-70801 A

In the conventional water heater, maintenance is difficult because the pipes connected to the heat exchange unit may get in the way during maintenance. In addition, in the narrow type hot water supply apparatus described in the above publication, the width of the hot water supply apparatus is narrow, so the pipes connected to the heat exchange unit are arranged in the depth direction of the water supply apparatus. Therefore, the piping is particularly likely to be a hindrance during maintenance. Maintenance is therefore particularly difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water supply apparatus that facilitates maintenance.

A water heater of the present invention comprises a housing having one open surface, a front lid covering the opening, a heat exchange unit arranged in the housing, a controlled unit arranged in the housing, and a and piping arranged and connected to the heat exchange unit. The pipe includes a first pipe fixed to the heat exchange unit and a second pipe detachably connected to the first pipe and the controlled unit, respectively. The second pipe is arranged so as to overlap the controlled unit when the inside of the housing is viewed from the opening.

According to one water heater of the present invention, the second pipe is detachably connected to the first pipe and the controlled unit, respectively, and overlaps the controlled unit when the inside of the housing is viewed from the opening. are placed. Therefore, by removing the second pipe from the first pipe and the controlled unit during maintenance such as replacement of the controlled unit, the second pipe does not interfere with maintenance. Therefore, maintenance such as replacement of the controlled unit is facilitated.

In one hot water supply apparatus of the present invention described above, the controlled unit is a water volume adjustment device that adjusts the volume of water flowing through the pipe. This facilitates maintenance of the water volume adjusting device.

The one water heater of the present invention described above further includes a first quick fastener and a second quick fastener. A first quick fastener detachably connects the second tube and the first tube to each other, and a second quick fastener detachably connects the second tube and the controlled unit. Therefore, the first quick fastener facilitates attachment and detachment of the second tube and the first tube, and the second quick fastener facilitates attachment and detachment of the second tube and the controlled unit.

In the one hot water supply apparatus of the present invention, the second pipe is configured to be removable from the controlled unit toward the opening from inside the housing. This makes it easier to remove the second tube from the controlled unit.

Another hot water supply apparatus of the present invention includes a housing having one open surface, a front lid covering the opening, a heat exchange unit arranged in the housing, a controlled unit arranged in the housing, and a and piping arranged and connected to the heat exchange unit. The piping is arranged so as to overlap the heat exchange unit and not overlap the controlled unit when the inside of the housing is viewed from the opening.

According to the above water heater of the present invention, the pipe is arranged so as not to overlap the controlled unit when the inside of the housing is viewed from the opening. Therefore, the piping does not interfere with maintenance such as replacement of the controlled unit. Therefore, maintenance such as replacement of the controlled unit is facilitated.

In the above water heater of the present invention, the controlled unit is a fan that blows air to the heat exchange unit. This facilitates maintenance of the fan.

As described above, according to the present invention, it is possible to provide a hot water supply apparatus that facilitates maintenance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically showing the structure of a water heater according to Embodiments 1 and 2 of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view schematically showing the structure of a water heater according to Embodiments 1 and 2 of the present invention; FIG. 2 is a front view schematically showing configurations of a housing, a heat exchange unit, a controlled unit, and piping of the hot water supply apparatus according to Embodiments 1 and 2 of the present invention; FIG. 2 is a perspective view schematically showing the configuration of the heat exchange unit and hot water supply circuit of the water heater according to Embodiments 1 and 2 of the present invention; 4 is an enlarged view of a V portion of FIG. 3; FIG. FIG. 4 is a perspective view showing a state in which the quick fastener of the water heater according to Embodiments 1 and 2 of the present invention connects the first pipe and the second pipe; Fig. 2 is a front view showing a state in which the second pipe of the hot water supply apparatus according to Embodiment 1 of the present invention is removed;

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. A hot water heating system will be described as an example of a hot water supply system according to an embodiment of the present invention.

(Embodiment 1)
A configuration of a hot water heating system according to Embodiment 1 of the present invention will be described with reference to FIG. As shown in FIG. 1, the hot water heating apparatus according to the present embodiment includes a cistern 1, a replenishing water circuit 2, a circulation circuit 3, a combustion unit 4, a hot water supply circuit 5, a pipe 6 (overflow pipe), It has a fan 7 and a water volume adjusting device 8 . In this embodiment, the controlled unit is the water volume regulator 8 .

The water supply circuit 2 has a pipe 2a. The circulation circuit 3 has a pipe 3a, a pipe 3b, a pipe 3c, a pipe 3d, a pipe 3e and a pipe 3f, and a pump 3g. The combustion unit 4 has a primary heat exchanger 4a, a secondary heat exchanger 4b, a primary heat exchanger 4c, a secondary heat exchanger 4d, and a burner 4e. The hot water supply circuit 5 has a pipe 5a, a pipe 5b, a pipe 5c, and a pipe 5d.

One end of the pipe 2 a is connected to the cistern 1 . The other end of the pipe 2a is connected to the water supply. One end of the pipe 6 is connected to the cistern 1, and the other end is connected to the outside of the hot water heater.

One end of the pipe 3 a is connected to the cistern 1 . The other end of pipe 3a is connected to a portion where one end of pipe 3b and one end of pipe 3c are connected. The other end of the pipe 3b is connected to a low-temperature heating terminal 6a. The other end of the pipe 3c is connected to the primary heat exchanger 4a. One end of the pipe 3d is connected to the primary heat exchanger 4a. The other end of the pipe 3d is connected to the high temperature heating terminal 6b.

The pipe 3e is branched at one end. One end of the pipe 3e branched at one end is connected to the low-temperature heating terminal 6a. The other end of the pipe 3e branched at one end is connected to the high temperature heating terminal 6b. The other end of the pipe 3e is connected to the secondary heat exchanger 4b. One end of the pipe 3f is connected to the secondary heat exchanger 4b. The other end of the pipe 3 f is connected to the cistern 1 . The pump 3g is arranged on the route of the pipe 3a. The pump 3g circulates the water stored in the cistern 1 along the circulation circuit 3 (see the arrow direction in FIG. 1).

One end of the pipe 5a is connected to the water supply. The other end of the pipe 5a is connected to the secondary heat exchanger 4d. The secondary heat exchanger 4d is connected to the primary heat exchanger 4c via a pipe 5d. One end of the pipe 5b is connected to the secondary heat exchanger 4d. The other end of the pipe 5b is connected to a callan or the like. The pipe 5c is connected to the pipes 5a and 5b.

The burner 4e generates combustion gas. The burner 4e is arranged near the primary heat exchangers 4a and 4c. The primary heat exchangers 4a and 4c exchange heat with the burner 4e. The secondary heat exchanger 4b and the secondary heat exchanger 4d exchange heat with the residual heat of the burner 4e after heat exchange with the primary heat exchanger 4a and the primary heat exchanger 4c. The primary heat exchanger 4a, the secondary heat exchanger 4b, the primary heat exchanger 4c, and the secondary heat exchanger 4d are, for example, fin-and-tube heat exchangers. In this embodiment, the burner 4 e is arranged below the combustion unit 4 . That is, the burner 4e is of the positive combustion type.

The fan 7 supplies a mixed gas of fuel and air to the burner 4e. In this embodiment, the fan 7 supplies the mixed gas upward to the burner 4e, as indicated by the white arrow in FIG.

The water volume adjusting device 8 adjusts the volume of water flowing through the pipe. The water flow rate adjusting device 8 includes a bypass flow rate adjusting valve 8a that adjusts the flow rate passing through the pipe 5c, and a water flow rate adjusting valve 8b that adjusts the hot water flow rate.

Next, the operation of the hot water heating system according to this embodiment will be described.
First, the heating operation of the hot water heating system according to the present embodiment will be described. Water is supplied to the cistern 1 from the waterworks via the pipe 2a. When the amount of water stored in the cistern 1 becomes excessive, the water stored in the cistern 1 is discharged to the outside through the pipe 6 .

The water stored in the cistern 1 is supplied to the primary heat exchanger 4a through the pipes 3a and 3c. The water supplied to the primary heat exchanger 4a is heated. The water heated in the primary heat exchanger 4a is supplied to the high-temperature heating terminal 6b through the pipe 3d.

The high-temperature heating terminal 6b performs a heating operation with water supplied through the pipe 3d. The water heated by the high-temperature heating terminal 6b is supplied to the secondary heat exchanger 4b through the pipe 3e. The water supplied to the secondary heat exchanger 4b is heated. The water heated in the secondary heat exchanger 4b is returned to the cistern 1 through the pipe 3f.

The water stored in the cistern 1 is supplied to the low-temperature heating terminal 6a through the pipes 3a and 3b. The low-temperature heating terminal 6a performs a heating operation with water supplied through the pipes 3a and 3b. The water heated by the low-temperature heating terminal 6a is supplied to the secondary heat exchanger 4b through the pipe 3e. The water supplied to the secondary heat exchanger 4b is heated. The water heated in the secondary heat exchanger 4b is returned to the cistern 1 through the pipe 3f.

Next, hot water supply operation by the hot water heating system according to the embodiment will be described. Water is supplied from the water supply to the primary heat exchanger 4c and the secondary heat exchanger 4d through the pipe 5a. The water supplied to the primary heat exchanger 4c and the secondary heat exchanger 4d is heated. The water heated in the primary heat exchanger 4c and the secondary heat exchanger 4d is supplied to a callan or the like through the pipe 5b.

Next, the configuration of each component of the hot water heater according to the present embodiment will be described with reference to FIGS. 2 to 7. FIG. FIG. 2 shows a state in which the front cover 11 is attached to the housing 10 of the hot water heater according to the present embodiment. The hot water heating device according to the present embodiment is a narrow type hot water heating device.

As shown in FIG. 2, the hot water heater according to the present embodiment has a housing 10 and a front cover 11. As shown in FIG. The housing 10 has one open surface. The front cover 11 covers the opening OP (see FIG. 3). The housing 10 has a top plate 10a, a bottom plate 10b, a side plate 10c, a side plate 10d, and a back plate 10e. The ends of the top plate 10a, bottom plate 10b, side plate 10c, and side plate 10d opposite to the back plate 10e form an opening OP. The top plate 10a faces the bottom plate 10b. The side plate 10c, the side plate 10d and the back plate 10e are connected to the top plate 10a and the bottom plate 10b. The side plate 10c faces the side plate 10d. The back plate 10 e faces the front lid 11 .

The front cover 11 is configured to be removable from the housing 10 . The housing 10 is opened on the front lid 11 side by removing the front lid 11 . From another point of view, the inside of the housing 10 can be accessed by removing the front cover 11 . The front cover 11 is provided with an exhaust port 11a.

The direction from the front lid 11 to the back plate 10e is along the first direction DR1. The second direction DR2 is orthogonal to the first direction DR1. The second direction DR2 extends from the side plate 10d toward the side plate 10c. The third direction DR3 is orthogonal to each of the first direction DR1 and the second direction DR2. The third direction DR3 is along the direction from the bottom plate 10b toward the top plate 10a.

The housing 10 has a width (depth) W1 and a width W2. Width W1 is the width of housing 10 in first direction DR1. Width W2 is the width of housing 10 in second direction DR2. From another point of view, the width W1 is the distance between the front lid 11 and the back plate 10e, and the width W2 is the distance between the side plates 10c and 10d. Width W1 is greater than width W2. Therefore, the hot water heating apparatus according to the present embodiment is installed such that the front cover 11 is perpendicular to the outer wall of the house (the side plates 10c and 10d are installed so as to face the outer wall of the house).

FIG. 3 is a view showing the housing 10 of the hot water heating apparatus according to the present embodiment from the opening OP side. For convenience of explanation, FIG. 3 shows the combustion unit 4, the hot water supply circuit 5, the fan 7, and the water quantity adjusting device 8 among the constituent elements, and does not show the other constituent elements. FIG. 4 shows hot water supply circuit 5 and heat exchange unit 40 .

As shown in FIGS. 3 and 4, the combustion unit 4 has a heat exchange unit 40 . The heat exchange unit 40 is arranged inside the housing 10 . The heat exchange unit 40 has a primary heat exchange section 41 and a secondary heat exchange section 42 . The primary heat exchange section 41 has a primary heat exchanger 4a and a primary heat exchanger 4c.

As shown in FIGS. 2 and 4, the primary heat exchanger 4a is arranged on the back plate 10e side. The primary heat exchanger 4c is arranged on the front cover 11 side. The secondary heat exchange section 42 has a secondary heat exchanger 4b and a secondary heat exchanger 4d. The secondary heat exchanger 4b is arranged on the back plate 10e side. The secondary heat exchanger 4d is arranged on the front cover 11 side.

As shown in FIGS. 3 and 4, the burner 4e is arranged inside the housing 10. As shown in FIG. The primary heat exchange section 41 is arranged above the burner 4e. The secondary heat exchange section 42 is arranged above the primary heat exchange section 41 .

The fan 7 is arranged inside the housing 10 . The fan 7 is arranged below the burner 4e. The water volume adjusting device 8 is arranged inside the housing 10 . The water volume adjusting device 8 is arranged below the fan 7 .

The pipes 5 a , 5 b , 5 c and 5 d are arranged inside the housing 10 . The pipe 5a, the pipe 5b, and the pipe 5c are connected to the heat exchange unit 40 and the water volume adjusting device 8. As shown in FIG. The pipe 5a is connected to the secondary heat exchanger 4d of the secondary heat exchange section 42 and the bypass flow control valve 8a. The pipe 5a has a first pipe 5a1 and a second pipe 5a2. The first pipe 5 a 1 is fixed to the heat exchange unit 40 . Specifically, the first pipe 5 a 1 is fixed to the secondary heat exchanger 4 d of the secondary heat exchange section 42 . The second pipe 5a2 is detachably connected to the first pipe 5a1 and the bypass flow control valve 8a.

The second pipe 5a2 has a portion arranged between the opening OP and the bypass flow control valve 8a along the first direction DR1. The second pipe 5a2 is arranged so as to overlap the bypass flow control valve 8a when the inside of the housing 10 is viewed from the opening OP. That is, the second pipe 5a2 is arranged so as to overlap the bypass flow control valve 8a between the opening OP and the bypass flow control valve 8a when the inside of the housing 10 is viewed from the opening OP.

The pipe 5b is connected to the primary heat exchanger 4c of the primary heat exchange section 41 and the water flow control valve 8b. The pipe 5b has a first pipe 5b1 and a second pipe 5b2. The first pipe 5b1 is fixed to the heat exchange unit 40. As shown in FIG. Specifically, the first pipe 5 b 1 is fixed to the primary heat exchanger 4 c of the primary heat exchange section 41 . The second pipe 5b2 is detachably connected to the first pipe 5b1 and the water flow control valve 8b.

The second pipe 5b2 has a portion arranged between the opening OP and the water flow control valve 8b along the first direction DR1. The second pipe 5b2 is arranged so as to overlap the water flow control valve 8b when the inside of the housing 10 is viewed from the opening OP. That is, the second pipe 5b2 is arranged so as to overlap the water flow control valve 8b between the opening OP and the water flow control valve 8b when the inside of the housing 10 is viewed from the opening OP.

The pipe 5c is connected to the pipe 5b and the bypass flow control valve 8a. The pipe 5c is connected to the primary heat exchanger 4c of the primary heat exchange section 41 via the pipe 5b. The pipe 5c has a first pipe 5c1 and a second pipe 5c2. The first pipe 5c1 is fixed to the heat exchange unit 40 via the first pipe 5b1 of the pipe 5b. Specifically, the first pipe 5c1 is fixed to the first pipe 5b1 of the pipe 5b. The second pipe 5c2 is detachably connected to the first pipe 5c1 and the bypass flow control valve 8a.

The second pipe 5c2 has a portion arranged between the opening OP and the bypass flow control valve 8a along the first direction DR1. The second pipe 5c2 is arranged so as to overlap the bypass flow control valve 8a when the inside of the housing 10 is viewed from the opening OP. That is, the second pipe 5c2 is arranged so as to overlap the bypass flow control valve 8a between the opening OP and the bypass flow control valve 8a when the inside of the housing 10 is viewed from the opening OP.

The pipe 5 d is connected to the primary heat exchanger 4 c of the primary heat exchange section 41 and the secondary heat exchanger 4 d of the secondary heat exchange section 42 .

The end of the second pipe 5a2 of the pipe 5a on the connection side with the first pipe 5a1 extends along the second direction DR2. The end of the second pipe 5a2 of the pipe 5a on the connection side with the bypass flow control valve 8a extends along the first direction DR1 with respect to the bypass flow control valve 8a. Therefore, the second pipe 5a2 is detachable from the bypass flow control valve 8a toward the opening OP from inside the housing 10. As shown in FIG.

The end of the second pipe 5b2 of the pipe 5b on the connection side with the first pipe 5b1 extends along the second direction DR2. The end of the second pipe 5b2 of the pipe 5b on the connection side with the water flow rate adjustment valve 8b extends along the first direction DR1 with respect to the water flow rate adjustment valve 8b. Therefore, the second pipe 5b2 is detachable from the water flow control valve 8b toward the opening OP from inside the housing 10. As shown in FIG.

The end of the second pipe 5c2 of the pipe 5c on the connection side with the first pipe 5c1 extends along the second direction DR2. The end of the second pipe 5c2 of the pipe 5c on the connection side with the bypass flow control valve 8a extends along the first direction DR1 with respect to the bypass flow control valve 8a. Therefore, the second pipe 5c2 is detachable from the bypass flow control valve 8a toward the opening OP from inside the housing 10. As shown in FIG.

A hot water heater according to an embodiment includes a quick fastener CF. The quick fastener CF includes a first quick fastener CF1 and a second quick fastener CF2. The first quick fastener CF1 detachably connects the second pipe 5a2 and the first pipe 5a1 of the pipe 5a. The second quick fastener CF2 detachably connects the second pipe 5a2 of the pipe 5a and the bypass flow control valve 8a.

The first quick fastener CF1 detachably connects the second pipe 5b2 and the first pipe 5b1 of the pipe 5b. The second quick fastener CF2 detachably connects the second pipe 5b2 of the pipe 5b and the water flow control valve 8b.

The first quick fastener CF1 detachably connects the second pipe 5c2 and the first pipe 5c1 of the pipe 5c. The second quick fastener CF2 detachably connects the second pipe 5c2 of the pipe 5c and the bypass flow control valve 8a.

The configuration of the quick fastener CF will be described with reference to FIGS. 5 and 6. FIG. Here, the case where the first pipe 5c1 and the second pipe 5c2 of the pipe 5c are detachably connected by the first quick fastener CF1 will be described. As for the pipes 5a and 5b, the first pipes 5a1 and 5b1 and the second pipes 5a2 and 5b2 are detachably connected to each other by quick fasteners CF, similarly to the pipe 5c. Further, each of the pipes 5a, 5b, 5c is detachably connected to the water volume adjusting device 8 by the quick fastener CF.

As shown in FIGS. 5 and 6, the first quick fastener CF1 includes a central portion CP, a first end E1 connected to one end of the central portion CP, and a second end E1 connected to the other end of the central portion CP. and a connected second end E2.

The first end E1 is configured to be separated from the second end E2 toward the tip opposite to the central portion CP. The first end E1 has a curved portion C1 provided between the central portion CP and the tip. A through hole H1 is provided in the first end E1. The through hole H1 extends along the longitudinal direction of the first end E1.

The second end E2 is configured to separate from the first end E1 toward the tip opposite to the central portion CP. The second end E2 has a curved portion C2 provided between the central portion CP and the tip. A through hole H2 is provided in the second end E2. The through hole H2 extends along the longitudinal direction of the second end E2.

The first quick fastener CF1 elastically deforms such that the distance between the first end E1 and the second end E2 varies. With the enlarged diameter portions of the first pipe 5c1 and the second pipe 5c2 of the pipe 5c inserted into the through hole H1 and the through hole H2, the first pipe 5c1 and the second pipe 5c1 and the second pipe are formed between the curved portion C1 and the curved portion C2. 5c2 are sandwiched. Thereby, the first quick fastener CF1 attaches the first pipe 5c1 and the second pipe 5c2 of the pipe 5c to each other. Moreover, the quick fastener CF is removed from the first tube 5c1 and the second tube 5c2 by widening the distance between the first end E1 and the second end E2. Thus, the quick fastener CF detachably connects the first tube 5c1 and the second tube 5c2 to each other.

As shown in FIGS. 3 and 7, the second pipe 5a2 of the pipe 5a is removed from the first pipe 5a1 and removed from the bypass flow control valve 8a. Thereby, the bypass flow control valve 8a is not covered with the second pipe 5a2. Therefore, the second pipe 5a2 does not interfere with attachment and detachment of the bypass flow control valve 8a. The second pipe 5b2 of the pipe 5b is removed from the first pipe 5b1 and removed from the water flow control valve 8b. As a result, the water flow control valve 8b is not covered with the second pipe 5b2. Therefore, the second pipe 5b2 does not interfere with attachment and detachment of the water flow rate control valve 8b. The second pipe 5c2 of the pipe 5c is removed from the first pipe 5c1 and removed from the bypass flow control valve 8a. Thereby, the bypass flow control valve 8a is not covered with the second pipe 5c2. That is, the second pipe 5c2 does not interfere with attachment and detachment of the bypass flow control valve 8a.

Next, the effects of the hot water heating system according to this embodiment will be described.
According to the hot water heating apparatus according to the present embodiment, the second pipe 5a2 of the pipe 5a is detachably connected to the first pipe 5a1 and the bypass flow control valve 8a, and the inside of the housing 10 is passed through the opening OP. When viewed, it is arranged so as to overlap with the bypass flow control valve 8a. Therefore, the second pipe 5a2 does not interfere with maintenance by removing the first pipe 5a1 of the pipe 5a and the second pipe 5a2 from the bypass flow control valve 8a during maintenance such as replacement of the bypass flow control valve 8a. Therefore, maintenance such as replacement of the bypass flow control valve 8a is facilitated. That is, compared with the case where the entire pipe 5a fixed to the heat exchange unit 40 is removed, only the second pipe 5a2 is removed, so maintenance becomes easier. In addition, compared to the case where the entire pipe 5a is fixed to the heat exchange unit 40 by brazing or the like, the second pipe 5a2 is detachable, which facilitates maintenance. Furthermore, since the second pipe 5a2 is removed, problems such as bending of the pipe 5a during maintenance can be suppressed.

In addition, the second pipe 5b2 of the pipe 5b is detachably connected to the first pipe 5b1 and the water flow rate adjustment valve 8b, respectively. arranged to overlap. Therefore, by removing the second pipe 5a2 from the first pipe 5b1 of the pipe 5b and the water flow control valve 8b during maintenance such as replacement of the water flow control valve 8b, the second pipe 5a2 does not interfere with maintenance. Therefore, maintenance such as replacement of the water flow control valve 8b is facilitated.

Further, the second pipe 5c2 of the pipe 5c is detachably connected to the first pipe 5c1 and the bypass flow control valve 8a, respectively. arranged to overlap. Therefore, the second pipe 5c2 does not interfere with maintenance by removing the first pipe 5c1 of the pipe 5c and the second pipe 5c2 from the bypass flow control valve 8a during maintenance such as replacement of the bypass flow control valve 8a. Therefore, maintenance such as replacement of the bypass flow control valve 8a is facilitated.

In a typical narrow-type hot water heating system, the piping connected to the heat exchange unit is arranged in the depth direction of the hot water heating system, so the piping is particularly likely to be an obstacle during maintenance. On the other hand, according to the hot water heating apparatus according to the present embodiment, since the second pipes 5a2, 5b2, 5c2 are removed from the water amount adjusting device 8, even in a narrow type hot water heating apparatus, the second The pipes 5a2, 5b2, 5c2 do not interfere with maintenance such as replacement of the water volume adjusting device 8. Therefore, the hot water heating apparatus according to the present embodiment is particularly suitable for a narrow type hot water heating apparatus.

In the hot water heating system according to the present embodiment, the controlled unit is the water volume adjusting device 8 . Therefore, the maintenance of the water volume adjusting device 8 is facilitated.

In the hot water heating apparatus according to the present embodiment, the first quick fastener CF1 detachably connects the second pipe 5a2 and the first pipe 5a1 of the pipe 5a, and the second quick fastener CF2 connects the second pipe 5a2 to the second pipe 5a2. and the bypass flow control valve 8a are detachably connected. Therefore, the first quick fastener CF1 facilitates attachment and detachment of the second pipe 5a2 and the first pipe 5a1, and the second quick fastener CF2 facilitates attachment and detachment of the second pipe 5a2 and the bypass flow control valve 8a. . In addition, the quick fastener CF can be easily attached and detached because it is possible to connect the piping without using a tool such as a screwdriver.

Also, the first quick fastener CF1 detachably connects the second pipe 5b2 and the first pipe 5b1 of the pipe 5b, and the second quick fastener CF2 connects the second pipe 5b2 and the water flow control valve 8b. It is detachably connected. Therefore, the first quick fastener CF1 facilitates attachment and detachment of the second pipe 5b2 and the first pipe 5b1, and the second quick fastener CF2 facilitates attachment and detachment of the second pipe 5b2 and the water flow control valve 8b. .

The first quick fastener CF1 detachably connects the second pipe 5c2 and the first pipe 5c1 of the pipe 5c, and the second quick fastener CF2 connects the second pipe 5c2 and the bypass flow control valve 8a. and are detachably connected. Therefore, the first quick fastener CF1 facilitates attachment/detachment of the second pipe 5c2 and the first pipe 5c1, and the second quick fastener CF2 facilitates attachment/detachment of the second pipe 5c2 and the bypass flow control valve 8a. .

In the hot water heating apparatus according to the present embodiment, the second pipe 5a2 of the pipe 5a is configured to be removable from the bypass flow control valve 8a toward the opening OP from inside the housing 10. As shown in FIG. Therefore, it becomes easy to remove the second pipe 5a2 from the bypass flow control valve 8a.

Further, the second pipe 5b2 of the pipe 5b is configured to be removable from the water flow control valve 8b toward the opening OP from inside the housing 10. As shown in FIG. Therefore, it becomes easy to remove the second pipe 5b2 from the water flow control valve 8b.

Further, the second pipe 5c2 of the pipe 5c is configured to be removable from the bypass flow control valve 8a toward the opening OP from inside the housing 10. As shown in FIG. Therefore, it becomes easy to remove the second pipe 5c2 from the bypass flow control valve 8a.

(Embodiment 2)
Unless otherwise specified, the second embodiment of the present invention has the same configuration as the first embodiment of the present invention, so the same elements are denoted by the same reference numerals, and the description thereof will not be repeated. .

With reference to FIG. 3 again, the configuration of the hot water heating system according to the present embodiment will be described. As shown in FIG. 3, the controlled unit is the fan 7 . The fan 7 blows air to the heat exchange unit 40 . Each of the pipes 5a, 5b, and 5c is arranged so as to overlap the heat exchange unit 40 and not overlap the fan 7 when the inside of the housing 10 is viewed from the opening OP. Therefore, the pipes 5a, 5b, and 5c are not arranged on the projection plane of the fan 7 in the attaching/detaching direction when the fan 7 is attached/detached along the first direction DR1.

Specifically, each of the pipes 5a, 5b, 5c has a portion arranged between the opening OP and the heat exchange unit 40 along the first direction DR1. Each of the pipes 5a, 5b, 5c is arranged so as not to overlap the fan 7 along the first direction DR1. Each of the pipes 5a, 5b, 5c is arranged with a gap from the fan 7 along each of the second direction DR2 and the third direction DR3 when the inside of the housing 10 is viewed from the opening OP.

Next, the effects of the hot water heating system according to this embodiment will be described.
According to the hot water heating apparatus according to the present embodiment, the pipes 5a, 5b, and 5c are arranged so as not to overlap the fan 7 when the inside of the housing 10 is viewed from the opening OP. Therefore, the pipes 5a, 5b, and 5c do not interfere with maintenance such as replacement of the fan 7. FIG. Therefore, maintenance such as replacement of the fan 7 is facilitated.

In the hot water heating system according to this embodiment, the controlled unit is the fan 7 . Therefore, maintenance of the fan 7 is facilitated.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the meaning and range of equivalents of the scope of the claims.

1 cistern 2 replenishment circuit 2a, 3a, 3b, 3c, 3d, 3e, 3f, 5a, 5b, 5c, 5d, 6 piping 3 circulation circuit 4 combustion unit 4a, 4c primary heat exchanger 4b, 4d secondary heat exchanger, 4e burner, 5 hot water supply circuit, 5a1, 5b1, 5c1 first pipe, 5a2, 5b2, 5c2 second pipe, 6a low temperature heating terminal, 6b high temperature heating terminal, 7 fan, 8 water volume adjusting device, 8a bypass flow control valve, 8b water flow control valve, 10 housing, 11 front lid, 40 heat exchange unit, 41 primary heat exchange section, 42 secondary heat exchange section, CF quick fastener, OP opening.

Claims (4)

a housing having one open surface;
a front lid covering the opening;
a heat exchange unit disposed within the housing;
a controlled unit disposed within the housing;
a pipe arranged in the housing and connected to the heat exchange unit,
The pipe includes a first pipe fixed to the heat exchange unit and a second pipe detachably connected to the first pipe and the controlled unit, respectively;
The hot water supply apparatus, wherein the second pipe is arranged so as to overlap the controlled unit when the inside of the housing is viewed from the opening. 2. The water heater according to claim 1, wherein said controlled unit is a water volume adjusting device that adjusts the volume of water flowing through said pipe. further comprising a first quick fastener and a second quick fastener;
the first quick fastener detachably connects the second tube and the first tube to each other;
3. The water heater according to claim 1, wherein said second quick fastener detachably connects said second pipe and said controlled unit. The water heater according to any one of claims 1 to 3, wherein said second pipe is configured to be detachable from said controlled unit toward said opening from within said housing.

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