COMBUSTION DEVICE AND WATER HEATING DEVICE

- NORITZ CORPORATION

A combustion device including a chamber, a burner, a fan case, and a fan is provided. The chamber has a top wall. On the top wall, an inflow port penetrating through the top wall along a first direction and in communication with an internal space of the chamber is formed. The burner is attached to the chamber, so as to be spaced apart from and face the top wall in the first direction. In the fan case, a discharge port and an intake port penetrating through the fan case along the first direction and in communication with an internal space of the fan case are formed. The discharge port is connected with the inflow port. The fan is provided in the internal space of the fan case. A rotation axis of the fan is along the first direction.

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Description
CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Japan application serial no. 2020-212312, filed on Dec. 22, 2020. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND Technical Field

The invention relates to a combustion device and a water heating device.

Description of Related Art

Patent Document 1 (Japanese Patent No. 6571445) discloses a combustion device. The combustion device disclosed in Citation 1 has a combustion chamber, an intake fan housing part, an intake fan, and a fan motor. The intake fan is provided inside the intake fan housing part. An inflow port is formed on the top wall of the combustion chamber. With the fan motor rotating the intake fan about the rotation axis along the horizontal direction, a mixed gas is sucked into the inside of the intake fan housing part, and is supplied into the inside of the combustion chamber through a mixed gas passage formed in the intake fan housing part and the inflow port formed on the top wall.

Patent Document 2 (Japanese Patent No. 6534337) discloses a combustion device. The combustion device disclosed in Citation 2 has a burner body main body, a flat burner, a fan case, a fan, and a motor. The flat burner is provided to face the burner body main body in the top-down direction, so as to block the internal space of the burner body main body. In the burner body main body, an inflow port open along the horizontal direction is formed.

The fan is provided inside the fan case. In the fan case, the intake port open along the horizontal direction is formed. The fan case is connected, at a discharge port, to the inflow port of the burner body main body. Through the rotation of the fan, a mixed gas sucked into the inside of the fan case is supplied to an internal space of the burner body main body via the discharge port and the inflow port.

In the combustion device disclosed in Patent Document 1, since the rotation axis of the intake fan is along the horizontal direction, the size of the intake fan housing part in the top-down direction is large. In the combustion device disclosed in Patent Document 2, since the inflow port is open along the horizontal direction, the size of the burner body main body along the top-down direction is large. That is, it is difficult to reduce the height of the combustion device disclosed in Patent Document 1 and the combustion device disclosed in Patent Document 2.

PRIOR ART LITERATURE Patent Documents

[Patent Document 1] Japanese Patent No. 6571445

[Patent Document 2] Japanese Patent No. 6534337

SUMMARY

A combustion device according to the invention includes a chamber, a burner, a fan case, and a fan. The chamber has a top wall. On the top wall, an inflow port penetrating through the top wall along a first direction and in communication with an internal space of the chamber is formed. The burner is attached to the chamber, so as to be spaced apart from and face the top wall in the first direction. In the fan case, a discharge port penetrating through the fan case along the first direction and in communication with an internal space of the fan case is formed. The discharge port is connected with the inflow port. The fan is provided in the internal space of the fan case. A rotation axis of the fan is along the first direction.

In the combustion device, the fan case may have a bottom wall partially overlapped with the chamber when viewed in a plan view. The discharge port may be formed in a portion of the bottom wall overlapped with the chamber. In the combustion device, in a portion of the bottom wall not overlapped with the chamber, a suction port penetrating through the bottom wall along the first direction and in communication with the internal space of the fan case may be formed.

In the combustion device, the chamber may be further provided with a first periphery wall surrounding the inflow port and having a cylindrical shape protruding along the first direction. The fan case may be further provided with a second periphery wall surrounding the discharge port and having a cylindrical shape protruding along the first direction. The discharge port may be connected to the inflow port by inserting the second periphery wall into inside of the first periphery wall. A seal member may be provided between an inner periphery surface of the first periphery wall and an outer periphery surface of the second periphery wall.

In the combustion device, the inflow port may be located at a center of the chamber when viewed in a plan view. In the combustion device, the chamber and the fan case may be integrally formed.

A water heating device according to the invention includes a housing, a fix member, and the combustion device. The housing is open on a side of a second direction orthogonal to the first direction. The fan case is attached to the chamber by the fix member from a side of the chamber in the second direction.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a water heating device 100.

FIG. 2 is a front view of a combustion device 200.

FIG. 3 is a plan view of the combustion device 200.

FIG. 4 is a cross-sectional view along IV-IV of FIG. 3.

FIG. 5 is a schematic perspective view of a housing 300.

 DESCRIPTION OF THE EMBODIMENTS

Details of the embodiments of the invention will be described with reference to the drawings. In the following drawings, like or equivalent parts are labeled with the same reference symbols, and the same descriptions will not be repeated.

The invention provides a combustion device and a water heating device whose height can be reduced.

Configuration of Water Heating Device According to an Embodiment

In the following, the configuration of a water heating device (water heating device 100) according to an embodiment is described.

<Schematic Configuration of Water Heating Device 100>

FIG. 1 is a schematic view of the water heating device 100. As shown in FIG. 1, the water heating device 100 has a gas valve 10, an orifice 11, a venturi 12, a blowing device 13, a chamber 14, a burner 15, an ignition plug 16, a primary heat exchanger 20, a secondary heat exchanger 30, a duct 40, a pipe 50, a pipe 60, a pipe 70, and a bypass pipe 80. The blowing device 13, the chamber 14, and the burner 15 together are referred to as a combustion device 200. Details of the combustion device 200 will be described in the following.

By making the gas valve 10 open, a fuel gas is supplied to the venturi 12 via the orifice 11. The fuel gas supplied to the venturi 12 is mixed with air in the venturi 12 (the fuel gas mixed with air is referred to as mixed gas in the following). The mixed gas is supplied to the burner 15 via the chamber 14 by the blowing device 13. The mixed gas supplied to the burner 15 is ignited and combusted by sparking the ignition plug 16. Accordingly, a combustion gas is generated in the burner 15.

One end of the pipe 50 is connected to a water supply. The other end of the pipe 50 is connected to a water inlet port 30a of the secondary heat exchanger 30. One end of the pipe 60 is connected to a water outlet port 30b of the secondary heat exchanger 30. The other end of the pipe 60 is connected to a water inlet port 20a of the primary heat exchanger 20. One end of the pipe 70 is connected to a water outlet port 20b of the primary heat exchanger 20. The other end of the pipe 70 is connected to a hot water tap (not shown).

One end of the bypass pipe 80 is connected to the pipe 50 and the other end of the bypass pipe 80 is connected to the pipe 70. The bypass pipe 80 and the pipe 70 are connected by using a three-way valve 71. The duct 40 is connected to the secondary heat exchanger 30.

The water supplied from one end of the pipe 50 flows through the pipe 50 to be supplied to the secondary heat exchanger 30. By performing heat exchange with the combustion gas, the temperature of the water supplied to the secondary heat exchanger 30 is raised. The water flowing through the secondary heat exchanger 30 flows through the pipe 60 to be supplied to the primary heat exchanger 20. By performing heat exchange with the combustion gas, the temperature of the water supplied to the primary heat exchanger 20 is raised.

The water flowing through the primary heat exchanger 20 is mixed with water flowing through the bypass pipe 80 in the pipe 70. Accordingly, the temperature of the water is modulated. The water flowing through the pipe is supplied from the hot water tap. The combustion gas performing heat exchange with the water flowing through the primary heat exchanger 20 and the secondary heat exchanger 30 is discharged to the outside from the duct 40.

The water heating device 100 is further provided with a housing 300. The gas valve 10, the orifice 11, the venturi 12, the blowing device 13, the chamber 14, the burner 15, the ignition plug 16, the primary heat exchanger 20, the secondary heat exchanger 30, the duct 40, the pipe 50, the pipe 60, the pipe 70, and the bypass pipe 80 are accommodated inside the housing 300.

<Detailed Configuration of Combustion Device 200>

FIG. 2 is a front view of the combustion device 200. FIG. 3 is a front view of the combustion device 200. FIG. 4 is a cross-sectional view along IV-IV of FIG. 3. As shown in FIGS. 2 to 4, the combustion device 200 has the blowing device 13, the chamber 14, and the burner 15.

The blowing device 13 has a fan case 131, a motor 132, and a fan 133. The fan case 131 has a top wall 131a, a bottom wall 131b, and a side wall 131c. The top wall 131a and the bottom wall 131b are spaced apart and face each other in a first direction DR1. The first direction DR1, for example, corresponds to the top-down direction. The side wall 131c is connected to the top wall 131a and the bottom wall 131b. An internal space of the fan case 131 is defined by the top wall 131a, the bottom wall 131b, and the side wall 131c.

The fan case 131, for example, is provided to be partially overlapped with the chamber 14 when viewed in a plan view (e.g., when viewed along the first direction DR). The portion of the fan case 131 overlapped with the chamber 14 when viewed in a plan view is set as a first portion 131d, and the portion of the fan case 131 not overlapped with the chamber 14 when viewed in the plan view is set as a second portion 131e.

An intake port 131f and a discharge port 131g are formed in the fan case 131. The intake port 131f and the discharge port 131g are in communication with the internal space of the fan case 131. The intake port 131f and the discharge port 131g penetrate through the fan case 131 along the first direction DR1. Specifically, the intake port 131f is formed on the bottom wall 131b in the second portion 131e. In addition, the discharge port 131g is formed on the bottom wall 131b in the first portion 131d. Also, while not shown in the drawings, the venturi 12 is connected to the intake port 131f.

A through hole 131h is further formed in the fan case 131. The through hole 131h penetrates through the fan case 131 along the first direction D1, and is in communication with the internal space of the fan case 131. More specifically, the through hole 131h is formed on the top wall 131a in the second portion 131e.

The fan case 131 is further provided with a periphery wall 131i. The periphery wall 131i surrounds the periphery of the discharge port 131g. The periphery wall 131i is in a cylindrical shape protruding from the outer surface of the bottom wall 131b along the first direction DR1.

The motor 132 has a motor body 132a and a shaft 132b. The motor body 132a is provided on the top wall 131a. The shaft 132b extends along the first direction DR1. The shaft 132b is inserted into the through hole 131h. The motor body 132a rotates the shaft 132b about the central axis of the shaft 132b.

The fan 133 is provided in the internal space of the fan case 131. The fan 133 is attached to the shaft 132b. Therefore, with the motor body 132a rotating the shaft 132b, the fan 133 rotates about the rotation axis along the first direction in the internal space of the fan case 131. Together with the rotation of the fan 133, the mixed gas is sucked into the inside of the fan case 131 from the intake port 131f. In addition, together with the rotation of the fan 133, the mixed gas sucked into the inside of the fan case 131 is discharged from the discharge port 131g.

The chamber 14 has a top wall 141 and a side wall 142. An internal space of the chamber 14 is defined by the top wall 141 and the side wall 142.

An inflow port 141a is formed on the top wall 141. The inflow port 141a penetrates through the top wall 141 along the first direction DR1. The inflow port 141a is in communication with the internal space of the chamber 14. The inflow port 141a is formed at a portion of the top wall 141 overlapped with the fan case 131, when viewed in a plan view. The inflow port 141a is connected to the discharge port 131g. That is, the mixed gas is supplied into the internal space of the chamber 14 via the discharge port 131g and the intake port 141a. An inner diameter of the inflow port 141a is referred to as an internal diameter D.

The chamber 14 is further provided with a periphery wall 143. The periphery wall 143 surrounds the periphery of the inflow port 141a. The periphery wall 143 is in a cylindrical shape protruding from an outer surface 141b of the top wall 141 along the first direction DR1. An inner diameter of the periphery wall 143 is equal to or greater than an outer diameter of the periphery wall 131i. By inserting the periphery wall 131i into the inside of the periphery wall 143, the discharge port 131g and the inflow port 141a are connected.

A seal member 144 is provided between the outer periphery surface of the periphery wall 131i and the inner periphery surface of the periphery wall 143. More specifically, a groove 131j recessed toward the side of the inner periphery surface of the periphery wall 131i is formed on the outer periphery surface of the periphery wall 131i. The groove 131j is formed in a ring shape. The seal member 144 is provided in the groove 131j. Accordingly, the space between the discharge port 131g and the inflow port 141a (between the periphery wall 131i and the periphery wall 143) is hermetically sealed. The seal member 144, for example, is an O-ring.

The height of the chamber 14 is set as a height H. The height H is a distance between the outer surface 141b and the lower end of the side wall 142 (the end of the side wall 142 opposite to the top wall 141) in the first direction DR1. The height H for example, is smaller than the inner diameter D.

In the following, a direction orthogonal to the first direction DR1 is set as a second direction DR2. The fan case 131 is attached to the chamber 14 by a fix member 145. More specifically, the fan case 131 is attached to the top wall 141 from one side of the second direction DR2 by the fix member 145.

The burner 15 is attached to the chamber 14. The burner 15 is provided to be spaced apart from and face the top wall 141 in the first direction DR1. The burner 15 is attached to the side wall 142. By attaching the burner 15 to the chamber 14, the internal space of the chamber 14 is blocked.

In the burner 15, a flame hole (not shown in the drawings) is formed. The flame hole penetrates through the burner 15 along a thickness direction, and is in communication with the internal space of the chamber 14. The mixed gas supplied to the internal space of the chamber 14 is ejected from the flame hole. Through the ignition by the ignition plug 16, the mixed gas ejected from the flame hole is combusted, and flame is generated on the side of the outer surface of the burner 15. That is, the outer surface of the burner 15 becomes the combustion surface of the burner 15.

FIG. 5 is a schematic perspective view of the housing 300. As shown in FIG. 5, the housing 300 has a top wall 301, a bottom wall 302, a side wall 303, and a side wall 304. The top wall 301 and the bottom wall 302 are spaced apart and face each other in the first direction DR1. The side wall 303 and the side wall 304 are spaced apart and face each other in a third direction DR3. The third direction DR3 is a direction orthogonal to the first direction DR1 and the second direction DR2. The third direction DR3 corresponds to the horizontal direction.

The housing 300 is further provided with a back wall 305. One end of the housing 300 in the second direction DR2 becomes an opening part 306 defined by the top wall 301, the bottom wall 302, the side wall 303, and the side wall 304. The other end of the housing 300 in the second direction is blocked by the back wall 305. As described above, the fan case 131 is attached to the end part of the top wall 141 on one side of the second direction DR2 by the fix member 145. Therefore, the fix member 145 is at a position visible from the opening part 306 of the housing 300.

Effects of Combustion Device and Water Heating Device According to Embodiment

In the following, the effects of the combustion device 200 and the water heating device 100 are described.

In the combustion device 200, the direction of the rotation axis of the fan 133 is along the first direction DR1. Therefore, the size of the fan case 131 in the first direction DR1 can be reduced.

In the case where the inflow port 141a is formed along a direction orthogonal to the first direction DR1, the size (height H) of the chamber 14 in the first direction DR1 cannot be reduced to be smaller than the inner diameter D. However, in the combustion device 200, the inflow port 141a is formed on the top wall 141 along the first direction DR1, and the discharge port 131g connected to the inflow port 141a is formed in the fan case 131 along the first direction DR1. Therefore, it is possible to reduce the height H (specifically, to be smaller than the inner diameter D).

The drain generated in the internal space of the fan case 131 (water aggregated in the internal space of the fan case 131) enters the inside of the chamber 14 via the discharge port 131g and the inflow port 141a. In the combustion device 200, the seal member 144 is provided between the inner periphery surface of the periphery wall 143 and the outer periphery surface of the periphery wall 131i. Therefore, the drain can be suppressed from contacting the seal member 144.

In the combustion device 200, the fan case 131 is attached to the chamber 14 (top wall 141) by the fix member 145 from one side of the second direction DR2. In addition, in the housing 300, the opening part 306 is provided on one side of the second direction DR2. Therefore, according to the water heating device 100, the fix member 145 is visible from the opening part 306, and it is possible to easily remove the fix member 145.

First Modified Example

The inflow port 141a may also be formed at the center of the top wall 141, when viewed in a plan view. In such case, in both of a configuration in which the fan case 131 is provided on one side of the chamber 14 in the third direction DR3 and a configuration in which the fan case 131 is provided on the other side of the chamber 14 in the third direction DR3, the same chamber 14 can be shared.

Second Modified Example

While an example in which the groove 131j is formed on the outer periphery surface of the periphery wall 131i is described above, it may also be that, in place of the groove 131j, a ring-shaped groove is formed on the inner periphery surface of the periphery wall 143, and the seal member 144 is provided in the ring-shaped groove. In such case, like the case where the groove 131j is formed, it is possible to suppress the attachment of drain generated in the internal space of the fan case 131 to the seal member 144.

Third Modified Example

In the above, an example in which the fan case 131 and the chamber 14 are respectively different members are described, the fan case 131 and the chamber 14 may also be formed integrally (formed in one member). In such case, the seal member 144 is not required. Therefore, the number of components is reduced. Also, in such case, the design of the periphery structure of the inflow port 141a and the discharge port 131g is simplified.

While the embodiments of the invention have been described above, it is possible to make various modifications to the above embodiments. In addition, the scope of the invention is not limited to the above embodiments. The scope of the invention is indicated by the scope of claims and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The embodiments are particularly suitable for a combustion device and a water heating device having the combustion device.

Claims

1. A combustion device, comprising:

a chamber;
a burner;
a fan case; and
a fan,
wherein the chamber has a top wall,
on the top wall, an inflow port penetrating through the top wall along a first direction and in communication with an internal space of the chamber is formed,
the burner is attached to the chamber, so as to be spaced apart from and face the top wall in the first direction,
in the fan case, a discharge port penetrating through the fan case along the first direction and in communication with an internal space of the fan case is formed,
the discharge port is connected with the inflow port,
the fan is provided in the internal space of the fan case, and
a rotation axis of the fan is along the first direction.

2. The combustion device as claimed in claim 1, wherein the fan case has a bottom wall partially overlapped with the chamber when viewed in a plan view, and

the discharge port is formed in a portion of the bottom wall overlapped with the chamber.

3. The combustion device as claimed in claim 2, wherein in a portion of the bottom wall not overlapped with the chamber, a suction port penetrating through the bottom wall along the first direction and in communication with the internal space of the fan case is formed.

4. The combustion device as claimed in claim 1, wherein the chamber is further provided with a first periphery wall surrounding the inflow port and having a cylindrical shape protruding along the first direction,

the fan case is further provided with a second periphery wall surrounding the discharge port and having a cylindrical shape protruding along the first direction,
the discharge port is connected to the inflow port by inserting the second periphery wall into inside of the first periphery wall, and
a seal member is provided between an inner periphery surface of the first periphery wall and an outer periphery surface of the second periphery wall.

5. The combustion device as claimed in claim 1, wherein the inflow port is located at a center of the chamber when viewed in a plan view.

6. The combustion device as claimed claim 1, wherein a height of the chamber in the first direction is smaller than an inner diameter of the inflow port.

7. The combustion device as claimed in claim 1, wherein the chamber and the fan case are integrally formed.

8. A water heating device, comprising:

a housing;
a fix member; and
the combustion device as claimed in claim 1,
wherein the housing is open on a side of a second direction orthogonal to the first direction, and
the fan case is attached to the chamber by the fix member from a side of the chamber in the second direction.

9. The combustion device as claimed in claim 2, wherein the chamber is further provided with a first periphery wall surrounding the inflow port and having a cylindrical shape protruding along the first direction,

the fan case is further provided with a second periphery wall surrounding the discharge port and having a cylindrical shape protruding along the first direction,
the discharge port is connected to the inflow port by inserting the second periphery wall into inside of the first periphery wall, and
a seal member is provided between an inner periphery surface of the first periphery wall and an outer periphery surface of the second periphery wall.

10. The combustion device as claimed in claim 2, wherein the inflow port is located at a center of the chamber when viewed in a plan view.

11. The combustion device as claimed in claim 3, wherein the inflow port is located at a center of the chamber when viewed in a plan view.

12. The combustion device as claimed in claim 4, wherein the inflow port is located at a center of the chamber when viewed in a plan view.

13. The combustion device as claimed claim 2, wherein a height of the chamber in the first direction is smaller than an inner diameter of the inflow port.

14. The combustion device as claimed claim 3, wherein a height of the chamber in the first direction is smaller than an inner diameter of the inflow port.

15. The combustion device as claimed claim 4, wherein a height of the chamber in the first direction is smaller than an inner diameter of the inflow port.

16. The combustion device as claimed claim 5, wherein a height of the chamber in the first direction is smaller than an inner diameter of the inflow port.

17. A water heating device, comprising:

a housing;
a fix member; and
the combustion device as claimed in claim 2,
wherein the housing is open on a side of a second direction orthogonal to the first direction, and
the fan case is attached to the chamber by the fix member from a side of the chamber in the second direction.

18. A water heating device, comprising:

a housing;
a fix member; and
the combustion device as claimed in claim 3,
wherein the housing is open on a side of a second direction orthogonal to the first direction, and
the fan case is attached to the chamber by the fix member from a side of the chamber in the second direction.

19. A water heating device, comprising:

a housing;
a fix member; and
the combustion device as claimed in claim 4,
wherein the housing is open on a side of a second direction orthogonal to the first direction, and
the fan case is attached to the chamber by the fix member from a side of the chamber in the second direction.

20. A water heating device, comprising:

a housing;
a fix member; and
the combustion device as claimed in claim 5,
wherein the housing is open on a side of a second direction orthogonal to the first direction, and
the fan case is attached to the chamber by the fix member from a side of the chamber in the second direction.
Patent History
Publication number: 20220196284
Type: Application
Filed: Dec 2, 2021
Publication Date: Jun 23, 2022
Applicant: NORITZ CORPORATION (HYOGO)
Inventor: Tatsuya KARAKI (HYOGO)
Application Number: 17/541,218
Classifications
International Classification: F24H 1/14 (20060101); F23D 14/02 (20060101); F23D 14/62 (20060101); F23L 5/02 (20060101); F24H 9/02 (20060101); F24H 9/1836 (20060101);