JP2021105484A - Water heater - Google Patents

Abstract

To provide a technology that can reduce concentration of an exhaust gas contained in the air which is introduced into a gas-liquid mixing device in a water heater.SOLUTION: A water heater includes: a housing including a first side wall and a second side wall installed while being opposed to the first side wall; a combustion chamber; a gas burner; a heat exchanger; a fan including a suction port; a gas-liquid mixing device; an air introduction part having one end connected to the gas-liquid mixing device and the other end provided with an air introduction port; and an air passage having one end connected to a first air intake port and the other end provided with a second air intake port. When the second air intake port is installed on a side of the first side wall as compared to the suction port, the air introduction port is installed on a side of the second side wall as compared to the suction port. When the second air intake port is installed on the side of the second side wall as compared to the suction port, the air introduction port is installed on the side of the first side wall as compared to the suction port.SELECTED DRAWING: Figure 6

Description

The techniques disclosed herein relate to water heaters.

Patent Document 1 describes a housing, a combustion chamber housed in the housing, a gas burner housed inside the combustion chamber, a heat exchanger housed inside the combustion chamber, and housed in the housing. A fan that sends air to the combustion chamber, a gas-liquid mixer that is housed in the housing and dissolves air in water, and one end that is connected to the gas-liquid mixer, and the other end that introduces air. A water heater including an air introduction chamber provided with a port and an air introduction chamber for introducing air in a housing into a gas-liquid mixing device is disclosed. In this water heater, in a gas-liquid mixer, water in which air is dissolved (hereinafter referred to as "air-dissolved pressurized water") is generated by utilizing the air introduced from the air introduction unit. Then, when the air-dissolved pressurized water is supplied to the bathtub, fine bubbles are generated in the bathtub.

Japanese Unexamined Patent Publication No. 2012-245238

In a water heater that uses a gas burner, the housing is provided with an exhaust portion that exhausts the exhaust gas generated by the combustion of the gas burner to the outside. Then, a first air intake port for taking in air inside the housing may be provided on the surface of the housing provided with the exhaust portion. This is to ensure that the pressures at the exhaust section and the first intake port are substantially the same. Further, in a water heater using a gas burner, an air passage is provided in a housing, one end of which is connected to a first air intake port, and the other end of which is provided with a second air intake port. May have been. This is to prevent the water entering the housing from the first air intake port from flowing into the space where the fan or the like is arranged by the wall forming the air passage. The air taken in from the first air intake port and passed through the air passage and the second air intake port is sent to the combustion chamber via a fan.

Further, in a water heater provided with a gas-liquid mixer, an air introduction operation in which air in the housing is introduced into the gas-liquid mixer via an air introduction unit in order to generate air-dissolved pressurized water in the gas-liquid mixer. Is executed.

In such a water heater, in a situation where the outdoor wind is strong, air including exhaust gas discharged from the exhaust unit may pass through the first air intake port and be taken into the housing. .. In such a situation, when the air introduction operation is executed, the air containing the exhaust gas is introduced into the gas-liquid mixer through the air introduction unit. In this case, the gas-liquid mixer produces air-dissolved pressurized water in which the air containing the exhaust gas is dissolved. When air-dissolved pressurized water in which air containing exhaust gas is dissolved is supplied to the bathtub, there is a risk that an offensive odor may be generated in the bathroom (bathroom).

The present specification provides a technique capable of reducing the concentration of exhaust gas contained in air introduced into a gas-liquid mixer in a water heater.

The water heater disclosed by the present specification is a housing including a first side wall and a second side wall provided so as to face the first side wall, and the first side wall is exposed to exhaust gas outdoors. The housing and the housing, which are provided apart from the exhaust unit for discharging and a first air intake port for taking in the outdoor air, and housed in the housing. A combustion chamber, a gas burner housed inside the combustion chamber, a heat exchanger housed inside the combustion chamber, and a heat exchanger housed inside the housing, which sucks air in the housing. A gas-liquid mixing device that is a fan provided with a suction port, and the air sucked by the suction port is sent to the combustion chamber, is housed in the fan, and is housed in the housing, and dissolves air in water. An air introduction unit having one end connected to the gas-liquid mixing device and an air introduction port provided at the other end, and introducing the air in the housing into the gas-liquid mixing device. And an air passage provided in the housing, one end of which is connected to the first air intake port, and the other end of which is provided with a second air intake port. When the air intake port is provided on the first side wall side of the suction port, the air introduction port is provided on the second side wall side of the suction port, and the second air intake port is provided. Is provided on the second side wall side of the suction port, the air introduction port is provided on the first side wall side of the suction port.

According to the above configuration, a fan suction port is arranged between the second air intake port and the air introduction port in the direction connecting the first side wall and the second side wall. Therefore, even when air including exhaust gas is taken into the housing through the first air intake port and the second air intake port, most of the exhaust gas is the suction port of the fan. Is sucked into. Therefore, it becomes difficult for air including exhaust gas to flow into the vicinity of the air inlet. That is, the air containing the exhaust gas is present around the air inlet before the air containing the exhaust gas flows into the housing. Therefore, in a situation where air containing exhaust gas is taken into the housing, for example, even if an air introduction operation for introducing the air in the housing into the gas-liquid mixer is executed, the gas-liquid is passed through the air introduction port. The concentration of exhaust gas contained in the air introduced into the mixing device can be reduced.

When the second air intake port is provided on the first side wall side of the suction port, the air introduction portion is provided so that the air introduction port faces the second side wall side, and the second air intake port is provided. Is provided on the second side wall side of the suction port, the air introduction portion may be provided so that the air introduction port faces the first side wall side.

According to the above configuration, since the air inlet faces the side opposite to the second air intake port in which the air containing the exhaust gas is taken in, the air containing the exhaust gas is blown through the air inlet. It becomes difficult to introduce by the liquid mixing device. Therefore, the concentration of the exhaust gas contained in the air introduced into the gas-liquid mixing device can be further reduced through the air introduction port.

Further, another water heater disclosed by the present specification is a housing including a bottom wall and a first side wall connected to the bottom wall, and the first side wall is exposed to exhaust gas to the outside. The housing and the housing, which are provided apart from the exhaust unit for discharging and a first air intake port for taking in the outdoor air, and housed in the housing. A combustion chamber, a gas burner housed inside the combustion chamber, a heat exchanger housed inside the combustion chamber, and a heat exchanger housed inside the housing, which sucks air in the housing. A gas-liquid mixing device that is a fan provided with a suction port, and the air sucked by the suction port is sent to the combustion chamber, is housed in the fan, and is housed in the housing, and dissolves air in water. An air introduction unit having one end connected to the gas-liquid mixing device and an air introduction port provided at the other end, and introducing the air in the housing into the gas-liquid mixing device. And an air passage provided in the housing, one end of which is connected to the first air intake port, and the other end of which is provided with a second air intake port. When the air intake port is provided above the suction port, the air introduction port is provided below the suction port, and the second air intake port is below the suction port. If provided, the air inlet is provided above the suction port.

According to the above configuration, the fan suction port is arranged between the second air intake port and the air introduction port in the vertical direction. Therefore, even when air including exhaust gas is taken into the housing through the first air intake port and the second air intake port, most of the exhaust gas is the suction port of the fan. Is sucked into. Therefore, it becomes difficult for air including exhaust gas to flow into the vicinity of the air inlet. That is, the air containing the exhaust gas is present around the air inlet before the air containing the exhaust gas flows into the housing. Therefore, in a situation where air containing exhaust gas is taken into the housing, for example, even if an air introduction operation for introducing the air in the housing into the gas-liquid mixer is executed, the gas-liquid is passed through the air introduction port. The concentration of exhaust gas contained in the air introduced into the mixing device can be reduced.

When the second air intake port is provided above the suction port, the air introduction portion is provided so that the air introduction port faces downward, and the second air intake port is below the suction port. The air introduction portion may be provided so that the air introduction port faces upward.

According to the above configuration, since the air inlet faces the side opposite to the second air intake port in which the air containing the exhaust gas is taken in, the air containing the exhaust gas is blown through the air inlet. It becomes difficult to introduce into the liquid mixing device. Therefore, the concentration of the exhaust gas contained in the air introduced into the gas-liquid mixing device can be further reduced through the air introduction port.

It is a perspective view which looked at the water heater 2 which concerns on 1st Embodiment from the front left upper side. It is a perspective view which looked at the water heater 2 which concerns on 1st Embodiment from the rear right lower side. It is a perspective view which looked at the front wall 14 and the inner wall 24 which concerns on 1st Embodiment from the rear right upper side. In the first embodiment, it is a perspective view of the water heater 2 in a state where the front wall 14 and the inner wall 24 are removed, as viewed from the front left upper side. In the first embodiment, it is a perspective view of the water heater 2 in a state where the rear wall 16 is removed, as viewed from the rear right upper side. It is a schematic diagram which schematically represented the inside of the housing 10 in 1st Embodiment. It is a schematic diagram which schematically represented the inside of the housing 10 in 1st Embodiment. It is a schematic diagram schematically showing the inside of the housing 10 in the second embodiment. It is a schematic diagram which represented typically the water supply system 402 which concerns on 1st Example.

(First Embodiment)
The water heater 2 will be described with reference to FIGS. 1 to 6. As shown in FIGS. 1 and 2, the water heater 2 includes a housing 10. The housing 10 includes a bottom wall 12, a front wall 14, a rear wall 16, a right wall 18, a left wall 20, and an upper wall 22. The right wall 18, the left wall 20, and the upper wall 22 are integrally molded. An exhaust portion 14a for exhausting the exhaust gas generated in the combustion chamber 50, which will be described later, to the outside is provided on the upper portion of the front wall 14. Further, in the lower part of the front wall 14, first air intake ports 14b and 14c for taking in outdoor air into the housing 10 are provided. The exhaust portion 14a and the first air intake ports 14b and 14c are separated from each other.

As shown in FIGS. 3 and 6, an internal wall 24 is provided behind the front wall 14. The inner wall 24 is attached to the front wall 14. In the following, among the internal spaces of the housing 10, the space on the front wall 14 side of the internal wall 24 is referred to as the first internal space S1, and the space on the rear wall 16 side of the internal wall 24 is referred to as the first internal space. 2 It is called the internal space S2. As shown in FIG. 6, the front wall 14 and the inner wall 24 define an air passage 26 between the front wall 14 and the inner wall 24. One end of the air passage 26 is connected to the first air intake ports 14b and 14c of the front wall 14. A second air intake port 28 is provided at the other end of the air passage 26. The second air intake port 28 is defined by the front wall 14 and the inner wall 24, and communicates the first internal space S1 and the second internal space S2. The air passage 26 transfers the air taken into the internal space S1 of the housing 10 from the first air intake ports 14b and 14c of the front wall 14 to the second internal space S2 via the second air intake port 28. invite.

As shown in FIGS. 4 to 6, in the second internal space S2 of the housing 10, the first pump 30, the second pump 32, the third pump 34, the fan 40, the combustion chamber 50, and the neutralization A device 60, a gas-liquid mixing device 70, and a control device (not shown) are housed. The first pump 30, the second pump 32, and the gas-liquid mixing device 70 are provided on the right side of the second internal space S2. The neutralizer 60 is provided on the left side of the second internal space S2. The third pump 34 and the fan 40 are provided in the central portion of the second internal space S2 in the left-right direction. The combustion chamber 50 is provided above the fan 40. The control device is provided in the second internal space S2. The control device controls the operation of each component of the water heater 2.

As shown in FIG. 4, the first pump 30 and the second pump 32 are connected by a water pipe WP1. The second pump 32 is connected to the gas-liquid mixing device 70 via the water pipe WP2 (see FIG. 5). When the first pump 30 and the second pump 32 are driven, the water pressurized by the first pump 30 and the second pump 32 is supplied to the gas-liquid mixer 70.

As shown in FIG. 5, the third pump 34 is connected to the combustion chamber 50 (specifically, the auxiliary heat exchanger 56 described later) via the water pipe WP3. When the third pump 34 is driven, water is supplied to the combustion chamber 50. The third pump 34 is mainly used to circulate the water in the bathtub 410 (see FIG. 9) via the water heater 2.

The fan 40 and the combustion chamber 50 of FIG. 5 are connected. The suction port 40b of the fan 40 is provided on the rear surface 40a of the fan 40. The fan 40 sends the air sucked from the suction port 40b to the combustion chamber 50.

As shown in FIG. 6, the combustion chamber 50 houses a gas burner 52, a main heat exchanger 54, and an auxiliary heat exchanger 56. Water is heated by the gas burner 52, the main heat exchanger 54, and the sub heat exchanger 56. Further, the combustion gas of the gas burner 52 is exhausted by sending air from the fan 40 to the gas burner 52.

The main heat exchanger 54 is located above the gas burner 52. The main heat exchanger 54 heats the water flowing through the water passage pipe (not shown) in the main heat exchanger 54 by the combustion gas when the gas burner 52 burns the gas.

The sub heat exchanger 56 is arranged above the main heat exchanger 54. The sub-heat exchanger 56 uses the latent heat of the combustion gas to heat the water flowing through the water pipe (not shown) in the sub-heat exchanger 56. Specifically, the heat of condensation (latent heat) when the water vapor in the combustion gas that has passed through the main heat exchanger 54 condenses is used. The sub heat exchanger 56 is connected to the main heat exchanger 54 via a water pipe (not shown). Therefore, the water heated by the secondary heat exchanger 56 is further heated by passing through the main heat exchanger 54. The water heated by the main heat exchanger 54 and the sub heat exchanger 56 is supplied to the hot water supply location (for example, the bathtub 410 (see FIG. 9)).

An exhaust duct 58 for exhausting the combustion gas generated in the combustion chamber 50 is connected to the auxiliary heat exchanger 56. The exhaust duct 58 is connected to the exhaust portion 14a of the front wall 14.

As shown in FIG. 4, the combustion chamber 50 (specifically, the auxiliary heat exchanger 56) is connected to the neutralizer 60 via the drain pipe DP. Drain water is generated when the water is heated by the secondary heat exchanger 56. The drain water generated in the auxiliary heat exchanger 56 is sent to the neutralizer 60 through the drain pipe DP. The neutralizer 60 neutralizes the drain water sent from the drain pipe DP by the calcium carbonate stored in the neutralizer 60.

The gas-liquid mixing device 70 of FIG. 5 produces air-dissolved pressurized water in which air is dissolved in water. A water inflow section 72 and an air introduction section 74 are connected to the gas-liquid mixing device 70. The water inflow portion 72 is connected to the cylindrical side wall of the gas-liquid mixing device 70. The water inflow portion 72 is connected to the second pump 32 via the water pipe WP2.

One end 74a of the air introduction portion 74 is connected to the upper part of the gas-liquid mixing device 70. An air introduction port 74c is provided at the other end 74b of the air introduction portion 74. The other end 74b is provided so that the air introduction port 74c is parallel to the rear wall 16 of the housing 10. That is, the air introduction port 74c and the rear wall 16 of the housing 10 face each other. The other end 74b may be arranged so that the air introduction port 74c is inclined with respect to the rear wall 16 of the housing 10. Further, an air control valve 76 is provided between one end 74a and the other end 74b of the air introduction portion 74. By switching the air control valve 76 from the closed state to the open state, the air in the second internal space S2 of the housing 10 is taken into the gas-liquid mixing device 70 through the air introduction portion 74. When pressurized water is sent into the gas-liquid mixing device 70 from the water inflow section 72 while the gas-liquid mixing device 70 is filled with air, the air-dissolved pressurized water in the gas-liquid mixing device 70 Is generated. The generated air-dissolved pressurized water is sent to the bathtub 410 (see FIG. 9). Then, when the air-dissolved pressurized water sent to the bathtub 410 passes through the circulation connector 412 (see FIG. 9) attached to the bathtub 410 and is ejected into the bathtub 410, fine bubbles are generated in the bathtub 410. appear.

(First Example)
Subsequently, with reference to FIG. 9, the water supply system 402 using the water heater 2 of the first embodiment will be described. The water supply system 402 is a system that supplies the water heated by the heat exchangers 54 and 56 to the bathtub 410, the shower S, the faucet C, and the like. The water supply system 402 is also a system in which air-dissolved pressurized water generated by the gas-liquid mixing device 70 is supplied to the bathtub 410 to generate fine bubbles in the bathtub 410. Note that FIG. 9 shows the flow of water in a state in which the hot water supply operation and the fine bubble supply operation, which will be described later, are executed at the same time.

As shown in FIG. 9, the water supply system 402 includes a water heater 2, a bathtub 410, a shower S, and a faucet C. The water heater 2 is connected to a water supply source. The water heater 2 is connected to a shower S, a faucet C, and a bathtub 410 (specifically, a circulation connector 412) in the bathroom A. In this embodiment, the control device of the water heater 2 is configured to be able to communicate with a remote controller (not shown) that can be operated by the user. The control device can execute a fine bubble supply operation or the like according to the operation of the remote controller by the user. In addition, the user can set the hot water supply target temperature by operating the remote controller.

Subsequently, the hot water supply operation and the fine bubble supply operation executed by the control device of the water heater 2 will be described.

(Hot water supply operation)
The hot water supply operation is an operation for supplying water heated to the hot water supply target temperature to the hot water supply points (shower S, faucet C, bathtub 410, etc.). The control device starts the hot water supply operation when the flow rate of water detected by the flow rate sensor (not shown) provided on the downstream side of the water supply source exceeds a predetermined flow rate.

The control device first operates the fan 40. When the fan 40 operates, combustion air is supplied from the fan 40 to the combustion chamber 50 (specifically, the gas burner 52). As a result, the control device can operate the gas burner 52. Then, the water supplied into the combustion chamber 50 is heated, and the heated water is supplied to the hot water supply location. The control device ends the hot water supply operation when the flow rate of water detected by the flow rate sensor becomes less than a predetermined flow rate.

(Fine bubble supply operation)
The fine bubble supply operation is an operation in which the water supply system 402 generates air-dissolving pressurized water in the gas-liquid mixing device 70 and supplies the generated air-dissolving pressurized water to the bathtub 410 in the state of FIG. The fine bubble supply operation is composed of an air introduction operation and a water supply operation.

(Air introduction operation)
The control device starts the air introduction operation when it is determined that the water level of the water in the gas-liquid mixing device 70 is equal to or higher than the first water level. In the air introduction operation, the control device stops the driving of the first pump 30 and the second pump 32, drives the third pump 34, and switches the air control valve 76 from the closed state to the open state. As a result, air is introduced into the gas-liquid mixing device 70 through the air introducing unit 74, and the water in the gas-liquid mixing device 70 flows out, so that the water level in the gas-liquid mixing device 70 rises. descend. The control device determines that the water level in the gas-liquid mixing device 70 is equal to or higher than the first water level, and then the water level in the gas-liquid mixing device 70 is lower than the first water level. The air introduction operation is executed until it is determined that the water level is below the water level. In the air introduction operation, air-dissolved pressurized water is not generated.

(Water supply operation)
The control device starts the water supply operation when it is determined that the water level of the water in the gas-liquid mixing device 70 is lower than the second water level. In the water supply operation, the control device drives the first pump 30, the second pump 32, and the third pump 34. Further, the control device switches the air control valve 76 from the open state to the closed state. As a result, the water in the bathtub 410 reaches the first pump 30 through the circulation connector 412 and the combustion chamber 50. Then, the water pressurized by the first pump 30 and the second pump 32 is supplied to the gas-liquid mixing device 70, and the air-dissolved pressurized water is generated in the gas-liquid mixing device 70. Then, the generated air-dissolved pressurized water is discharged from the gas-liquid mixing device 70, passes through the circulation connector 412, and is ejected into the bathtub 410. The air-dissolved pressurized water is depressurized to below atmospheric pressure when passing through the fine bubble discharge nozzle (not shown) of the circulation connector 412. Then, when the air-dissolved pressurized water is ejected into the bathtub 410, the air-dissolved pressurized water is increased in pressure to atmospheric pressure, and fine bubbles are generated in the bathtub 410. The control device supplies water from the time when the water level in the gas-liquid mixing device is determined to be lower than the second water level to the time when the water level in the gas-liquid mixing device is determined to be equal to or higher than the first water level. Perform the operation.

The control device repeatedly executes the air introduction operation and the water supply operation according to the water level of the water in the gas-liquid mixing device 70.

When the user executes an operation for instructing the remote controller to stop the fine bubble supply operation, the control device stops the driving of the first pump 30, the second pump 32, and the third pump 34, and the air control valve 76. To switch to the closed state.

(Air flow in the housing 10 of the water heater 2)
Subsequently, with reference to FIGS. 6 and 7, the air flow in the housing 10 in the state where the fan 40 and the gas burner 52 are operating, that is, the state in which the hot water supply operation is being executed will be described. In FIGS. 6 and 7, the arrows indicate the main air flow.

First, as shown in FIG. 6, outdoor air is taken into the first internal space S1 of the housing 10. Specifically, air is taken into the air passage 26 between the front wall 14 and the inner wall 24 from the first air intake ports 14b and 14c of the front wall 14 of the housing 10. Next, the air that has passed through the air passage 26 flows into the second internal space S2 in which the fan 40 and the like are housed through the second air intake port 28. Most of the air that has flowed into the second internal space S2 is sucked into the suction port 40b of the fan 40 through the gaps between the members housed in the second internal space S2. Then, the air sucked into the fan 40 from the suction port 40b of the fan 40 is sent into the combustion chamber 50.

The air sent into the combustion chamber 50 is used for combustion of the gas burner 52 and also for exhaust gas of the gas burner 52. The exhaust gas of the gas burner 52 passes through the main heat exchanger 54 and is sent to the sub heat exchanger 56. Then, the exhaust gas sent to the sub-heat exchanger 56 is discharged to the outside from the exhaust duct 58 connected to the sub-heat exchanger 56 and the exhaust portion 14a of the front wall 14.

As described above, the exhaust gas generated in the combustion chamber 50 is discharged to the outside. The exhaust portion 14a of the front wall 14 and the first air intake ports 14b and 14c of the front wall 14 are provided apart from each other. That is, the air containing the exhaust gas discharged from the exhaust unit 14a is difficult to be taken in from the first air intake ports 14b and 14c. However, as shown in FIG. 7, in an outdoor windy situation or the like, the exhaust gas discharged from the exhaust unit 14a can be directed from the exhaust unit 14a toward the first air intake ports 14b and 14c. .. In this case, the air containing the exhaust gas discharged from the exhaust unit 14a may pass through the first air intake ports 14b and 14c and be taken into the housing 10. In such a situation, when the fine bubble supply operation (specifically, the air introduction operation) is executed, air containing exhaust gas is introduced into the gas-liquid mixing device 70 via the air introduction unit 74. In this case, the gas-liquid mixing device 70 generates air-dissolved pressurized water in which air containing exhaust gas is dissolved. When air-dissolved pressurized water in which air containing exhaust gas is dissolved is supplied to the bathtub 410, there is a possibility that an offensive odor may be generated in the bathroom A.

The water heater 2 of the water supply system 402 of the present embodiment is a housing 10 including a front wall 14 and a rear wall 16 provided so as to face the front wall 14, and the front wall 14 is exposed to exhaust gas outdoors. The housing 10 and the housing, which are provided apart from the exhaust unit 14a and the exhaust unit 14a, and are provided with the first air intake ports 14b and 14c for taking in outdoor air. The combustion chamber 50 housed in the combustion chamber 50, the gas burner 52 housed inside the combustion chamber 50, the heat exchangers 54 and 56 housed inside the combustion chamber 50, and the housing 10 housed in the housing 10. The fan 40 is provided with a suction port 40b for sucking air in the housing 10, and the air sucked by the suction port 40b is sent to the combustion chamber 50 and is housed in the fan 40 and the housing 10. An air introduction chamber 74 in which a gas-liquid mixing device 70 that dissolves air in water and one end 74a are connected to the gas-liquid mixing device 70 and an air introduction port 74c is provided at the other end 74b. An air introduction section 74 that introduces the air in the housing 10 into the gas-liquid mixing device 70, and one end connected to the first air intake ports 14b and 14c, and the other end being provided in the housing 10. 2 An air passage 26 provided with an air intake port 28 is provided. The second air intake port 28 is provided on the front wall 14 side of the suction port 40b of the fan 40, and the air introduction port 74c of the air introduction portion 74 is provided on the rear wall 16 side of the suction port 40b of the fan 40. Has been done. According to such a configuration, in the direction connecting the front wall 14 and the rear wall 16 (front-rear direction), the fan 40 is located between the second air intake port 28 and the air introduction port 74c of the air introduction portion 74. The suction port 40b is arranged. Therefore, even when air including exhaust gas is taken into the housing 10 through the first air intake ports 14b and 14c and the second air intake port 28, a large amount of exhaust gas is produced. Is sucked into the suction port 40b of the fan 40. Therefore, it becomes difficult for air including exhaust gas to flow into the periphery of the air introduction port 74c. That is, the air containing the exhaust gas is present around the air introduction port 74c before the air containing the exhaust gas flows into the housing 10. Therefore, even if the air introduction operation is executed in the situation where the air containing the exhaust gas is taken into the housing 10, the exhaust contained in the air introduced into the gas-liquid mixing device 70 through the air introduction port 74c The gas concentration can be reduced.

Further, in the water heater 2, the second air intake port 28 is provided on the front wall 14 side of the suction port 40b of the fan 40, and in the air introduction portion 74, the air introduction port 74c faces the rear wall 16 side. It is provided as follows. According to such a configuration, since the air introduction port 74c faces the side opposite to the second air intake port 28 in which the air containing the exhaust gas is taken in, the air containing the exhaust gas is the air introduction port 74c. It becomes difficult to be introduced by the gas-liquid mixing device 70. Therefore, the concentration of the exhaust gas contained in the air introduced into the gas-liquid mixing device 70 can be further reduced through the air introduction port 74c.

(Correspondence)
The front wall 14 and the rear wall 16 are examples of the “first side wall” and the “second side wall”, respectively.

(Second Embodiment)
The water heater 202 of the second embodiment will be described with reference to FIG. In the water heater 2 of this embodiment, the structure of the air introduction section 274 is different from the structure of the air introduction section 74 of the first embodiment. In the following, the same reference numerals will be given to the configurations common to the embodiments, and the description thereof will be omitted.

As shown in FIG. 8, one end 274a of the air introduction unit 274 is connected to the upper part of the gas-liquid mixing device 270. An air introduction port 274c is provided at the other end 274b of the air introduction portion 274. The other end 274b is provided below the suction port 40b of the fan 40. The other end 274b is provided so that the air introduction port 274c faces the bottom wall 12 of the housing 10.

The effect when the water heater 202 of the present embodiment is used for the water supply system 402 instead of the water heater 2 of the first embodiment will be described.

As described above, the water heater 202 is a housing 10 including a bottom wall 12 and a front wall 14 connected to the bottom wall 12, and the front wall 14 has an exhaust unit for discharging exhaust gas to the outside. 14a and first air intake ports 14b and 14c for taking in outdoor air are provided apart from the exhaust portion 14a, and are housed in the housing 10 and the housing 10. The combustion chamber 50, the gas burner 52 housed inside the combustion chamber 50, the heat exchangers 54 and 56 housed inside the combustion chamber 50, and the housing 10 housed in the housing 10. The fan 40 is provided with a suction port 40b for sucking the air inside, and the air sucked by the suction port 40b is sent to the combustion chamber 50 and is housed in the fan 40 and the housing 10, and the air is contained in water. An air introduction unit 274 in which a gas-liquid mixing device 270 and one end 274a are connected to the gas-liquid mixing device 270 and an air introduction port 274c is provided at the other end 274b, and the air in the housing 10 is provided. Is provided in the housing 10 and an air introduction unit 274 that introduces the air into the gas-liquid mixing device 270, one end of which is connected to the first air intake ports 14b and 14c, and the other end of which is the second air intake port. An air passage 26 provided with a 28 is provided. The second air intake port 28 is provided above the suction port 40b of the fan 40, and the air introduction port 274c of the air introduction portion 274 is provided below the suction port 40b of the fan 40. According to such a configuration, the suction port 40b of the fan 40 is arranged between the second air intake port 28 and the air introduction port 274c of the air introduction unit 274 in the vertical direction. Therefore, when air containing exhaust gas is taken into the housing 10 through the first air intake ports 14b and 14c and the second air intake port 28, most of the exhaust gas is taken from the fan 40. It is sucked into the suction port 40b. Therefore, it becomes difficult for air including exhaust gas to flow into the vicinity of the air introduction port 274c. That is, the air containing the exhaust gas is present around the air introduction port 274c before the air containing the exhaust gas flows into the housing 10. Therefore, even if the air introduction operation is executed in the situation where the air containing the exhaust gas is taken into the housing 10, the exhaust contained in the air introduced into the gas-liquid mixing device 270 via the air introduction port 274c The gas concentration can be reduced.

Further, in the water heater 202, the second air intake port 28 is provided above the suction port 40b of the fan 40, and the air introduction portion 274 is provided so that the air introduction port 274c faces downward. .. According to such a configuration, since the air introduction port 274c faces the side opposite to the second air intake port 28 in which the air containing the exhaust gas is taken in, the air containing the exhaust gas is the air introduction port 274c. It becomes difficult to be introduced into the gas-liquid mixing device 270. Therefore, the concentration of the exhaust gas contained in the air introduced into the gas-liquid mixing device 270 can be further reduced through the air introduction port 274c.

(Correspondence)
The front wall 14 is an example of the “first side wall”.

Although each embodiment has been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

(First Modified Example) In the water heater 2 of the first embodiment, the right wall 18 and the left wall 20 may be examples of a "first side wall" and a "second side wall", respectively. In this modification, the right wall 18 is provided with an exhaust unit and a first air intake port. When the second air intake port is provided on the right wall 18 side of the suction port 40b of the fan 40, the air introduction port 74c of the air introduction unit 74 is on the left wall 20 side of the suction port 40b of the fan 40. When the second air intake port is provided on the left wall 20 side of the suction port 40b of the fan 40, the air introduction port 74c of the air introduction unit 74 is larger than the suction port 40b of the fan 40. It is provided on the right wall 18 side. Further, in another modification, the left wall 20 and the right wall 18 may be examples of the “first side wall” and the “second side wall”, respectively, and the rear wall 16 and the front wall 14 may be examples of the “first side wall” and the “second side wall”, respectively. It may be an example of "first side wall" and "second side wall".

(Second Deformation Example) In the water heater 2 of the first embodiment, the second air intake port 28 may be provided on the rear wall 16 side of the suction port 40b of the fan 40. In this modification, the air introduction port 74c of the air introduction portion 74 may be provided on the front wall 14 side of the suction port 40b of the fan 40.

(Third Modified Example) In the water heater 2 of the first embodiment, the air introduction port 74c of the air introduction unit 74 may be provided so that the air introduction port 74c faces a wall other than the rear wall 16. ..

(Fourth Deformation Example) In the water heater 202 of the second embodiment, the rear wall 16, the right wall 18, or the left wall 20 may be an example of the “first side wall”. That is, the rear wall 16, the right wall 18, or the left wall 20 may be provided with an exhaust portion and a first air intake port.

(Fifth Modified Example) In the water heater 202 of the second embodiment, the second air intake port 28 may be provided below the suction port 40b of the fan 40. In this modification, the air introduction port 274c of the air introduction unit 274 may be provided above the suction port 40b of the fan 40.

(Sixth Deformation Example) In the water heater 202 of the second embodiment, the air introduction portion 274 may be provided so that the air introduction port 274c faces a wall other than the bottom wall 12.

(7th Modified Example) The suction port 40b of the fan 40 may be provided on the front surface of the fan 40.

(8th Modified Example) A third air intake port for taking in outdoor air into the housing 10 is provided on a wall different from the front wall 14 provided with the first air intake ports 14b and 14c. May be good. The third air intake port may be provided at a position close to the air introduction port 74c, such as the lower part of the rear wall 16 and the rear part of the bottom wall 12. According to such a configuration, in the air introduction operation, the air containing no exhaust gas taken into the housing from the third air intake port provided near the air introduction port 74c passes through the air introduction portion 74. Then, it is introduced into the gas-liquid mixing device 70. Therefore, the concentration of the exhaust gas contained in the air introduced into the gas-liquid mixing device 70 can be further reduced through the air introduction port 74c.

The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

2: Water heater 10: Housing 12: Bottom wall 14: Front wall 14a: Exhaust part 14b, 14c: First air intake port 16: Rear wall 18: Right wall 20: Left wall 22: Upper wall 24: Inner wall 26 : Air passage 28: Second air intake port 30: First pump 32: Second pump 34: Third pump 40: Fan 40a: Rear surface 40b: Suction port 50: Combustion chamber 52: Gas burner 54: Main heat exchanger 56 : Secondary heat exchanger 58: Exhaust duct 60: Neutralizer 70: Gas-liquid mixing device 72: Water inflow part 74: Air introduction part 74a: One end 74b: Other end 74c: Air introduction port 76: Air control valve 202: Hot water supply Vessel 270: Air-liquid mixing device 274: Air inlet 274a: One end 274b: Other end 274c: Air inlet 402: Water supply system 410: Bathtub 412: Circulation connector

Claims (4)

A housing including a first side wall and a second side wall provided so as to face the first side wall. The first side wall is separated from an exhaust portion for exhausting exhaust gas to the outside and the exhaust portion. The housing and the housing provided with the first air intake port for taking in the outdoor air.
The combustion chamber housed in the housing and
The gas burner housed inside the combustion chamber and
The heat exchanger housed inside the combustion chamber and
A fan housed in the housing and provided with a suction port for sucking air in the housing, and the air sucked by the suction port is sent to the combustion chamber with the fan.
A gas-liquid mixer housed in the housing that dissolves air in water,
An air introduction section having one end connected to the gas-liquid mixing device and an air introduction port provided at the other end, and the air introduction section for introducing the air in the housing into the gas-liquid mixing device.
An air passage provided in the housing, one end of which is connected to the first air intake port, and the other end of which is provided with a second air intake port.
When the second air intake port is provided on the first side wall side of the suction port, the air introduction port is provided on the second side wall side of the suction port.
A water heater in which the second air intake port is provided on the second side wall side of the suction port, and the air introduction port is provided on the first side wall side of the suction port. When the second air intake port is provided on the first side wall side of the suction port, the air introduction portion is provided so that the air introduction port faces the second side wall side.
When the second air intake port is provided on the second side wall side of the suction port, the air introduction portion is provided so that the air introduction port faces the first side wall side. The water heater according to claim 1. A housing including a bottom wall and a first side wall connected to the bottom wall, the first side wall is provided with an exhaust portion for exhausting exhaust gas to the outside and a portion separated from the exhaust portion. The housing and the housing provided with the first air intake port for taking in the outdoor air.
The combustion chamber housed in the housing and
The gas burner housed inside the combustion chamber and
The heat exchanger housed inside the combustion chamber and
A fan housed in the housing and provided with a suction port for sucking air in the housing, and the air sucked by the suction port is sent to the combustion chamber with the fan.
A gas-liquid mixer housed in the housing that dissolves air in water,
An air introduction section having one end connected to the gas-liquid mixing device and an air introduction port provided at the other end, and the air introduction section for introducing the air in the housing into the gas-liquid mixing device.
An air passage provided in the housing, one end of which is connected to the first air intake port, and the other end of which is provided with a second air intake port.
When the second air intake port is provided above the suction port, the air introduction port is provided below the suction port.
A water heater in which the air introduction port is provided above the suction port when the second air intake port is provided below the suction port. When the second air intake port is provided above the suction port, the air introduction portion is provided so that the air introduction port faces downward.
The water heater according to claim 3, wherein when the second air intake port is provided below the suction port, the air introduction portion is provided so that the air introduction port faces upward. ..

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