JP4461343B2 - Bath device with water heater - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a bath device with a water heater, and more particularly to a bath device with a water heater that supplies combustion air to a hot water burner and a bath burner with a single fan.
[0002]
[Prior art]
In general, in a bath apparatus with a water heater equipped with a water heater and a bath pot, a fan common to the hot water combustion body and the bath combustion body is used for the purpose of reducing the number of parts and reducing the product cost and downsizing the apparatus. 2. Description of the Related Art A bath device with a water heater that supplies combustion air is known.
Each of the hot water combustion main body and the bath combustion main body has an opening formed on the entire bottom surface thereof, and an air supply duct communicating with both openings is connected. In this air supply duct, the combustion air from the fan is distributed and sent to the bath combustion main body and the hot water supply combustion main body.
Various types of bath apparatuses with water heaters are manufactured according to hot water supply capacity such as No. 16, No. 20, and No. 24, for example. In other words, the capacity required for the circulating heating of the bath water is not so large, so it may be constant in any bath device with a hot water heater. .
[0003]
[Problems to be solved by the invention]
However, such a bath device with a hot water heater has a structure in which an opening is formed in the entire bottom surface of the hot water combustion body and an air supply duct is connected to the hot water combustion body. The main body is also enlarged, and the size of the air supply duct is increased in accordance with the opening formed in the entire bottom surface.
Thus, since the size of the air supply duct differs depending on the hot water supply capacity, a mold for forming the air supply duct is required for each hot water supply capacity, and the manufacturing cost becomes expensive.
Then, the bath apparatus with a hot water heater of this invention aims at solving the said subject and suppressing the manufacturing cost of an air supply duct.
[0004]
[Means for Solving the Problems]
  The bath apparatus with a hot water heater according to claim 1 of the present invention for solving the above problems
    A bath combustion body that circulates and heats the bathtub water flowing through the bath heat exchanger by the combustion heat of the bath burner,
  A hot water supply combustion main body that heats and controls the water flow of the hot water supply heat exchanger to reach a target temperature by the combustion heat of the hot water supply burner;
  A fan for supplying combustion air;
  It has a bath combustion body side connection opening and a hot water combustion body side connection openingAir supply ductThePrepared,
  Connect the hot water combustion main body to the bath combustion main body side connection opening of the air supply duct, and connect the hot water combustion main body of one of the hot water combustion bodies of different capacities to the hot water combustion main body side connection opening, The duct communicates with the bath combustion body and hot water combustion body,
In the bath apparatus with a hot water heater for distributing and supplying combustion air from the fan to the combustion main bodies through the connection openings of the air supply duct,
  UpCommunicate with the air supply ductAir supply inlet of the hot water combustion bodyThe hot water supply capacityHowThe main point is that the hot water combustion main bodies having different hot water supply capacities can be attached to and detached from a common air supply duct.
[0005]
  Moreover, the bath device with a water heater according to claim 2 of the present invention is the bath device with a water heater according to claim 1,
  A fuel supply path that is branched in the middle and supplies fuel to each of the hot water combustion main body and the bath combustion main body, and provided upstream of the branch point of the fuel supply path.Fuel proportional control valve that controls the amount of combustion in each combustion bodyAnd withThe amount of fuel per cross section of the combustion chamber in each combustion bodyFormationIn addition, the gist of the present invention is that the pressure at the intake inlet of each combustion main body is substantially the same.
[0006]
  Moreover, the bath apparatus with a water heater according to claim 3 of the present invention is the bath apparatus with a water heater according to claim 2,
  Each combustion body is formed so that the pressure loss coefficient of each combustion body is almost the same.The air flow rate per passage cross-sectional area on the combustion hot water main body side and the air flow rate per passage cross-sectional area on the bath combustion main body side are the same.This is the gist.
[0007]
  Moreover, the bath apparatus with a water heater according to claim 4 of the present invention is the bath apparatus with a water heater according to any one of claims 1 to 3,
  Of the hot water combustion bodySupply air inletThe gist is that the above fan can be directly connected.
[0008]
Moreover, the bath apparatus with a water heater according to claim 5 of the present invention is the bath apparatus with a water heater according to any one of claims 1 to 4,
Regardless of the hot water supply capability, the gist is that the main body case for housing the bath combustion main body, the fan, the air supply duct, and the hot water supply combustion main body is shared.
[0009]
  In the bath apparatus with a hot water heater according to claim 1 of the present invention having the above-described configuration, the combustion air is sent to the air supply duct by the fan, and is distributed to the bath combustion main body and the hot water supply combustion main body in the air supply duct. The air supplied to the bath burner contributes to combustion for circulatingly heating the bathtub water. On the other hand, the air supplied to the hot water supply burner contributes to the combustion for heating the water flow.
  This bath apparatus with a water heater communicates with the air supply duct of the hot water combustion main body regardless of the hot water supply capacity of the hot water combustion main body.Air supply inletAre formed in the same size, so that hot water supply combustion bodies having different hot water supply capacities can be attached to and detached from a common air supply duct.
[0010]
Further, in the bath apparatus with a hot water heater according to claim 2 of the present invention having the above-described configuration, the exhaust outlets of the hot water combustion main body and the bath combustion main body are opened to the atmospheric pressure so that the outlet pressure is equal, Since the pressure at the supply air inlet is made substantially the same, the pressure lost in each combustion body (pressure loss P) can be made substantially equal.
This pressure loss P is obtained by multiplying the square of the air flow velocity v (= air flow rate Q / passage cross-sectional area A of the combustion chamber) by the pressure loss coefficient k of each combustion main body, so that the combustion amount ( Even if the air supply amount increases or decreases with the fluctuation of the input), the ratio of the air flow rate distributed to each combustion main body is always constant.
As described above, since the pressure at the intake air inlet portion in each combustion main body is substantially the same, the air distribution ratio to each combustion main body is always constant regardless of the fluctuation of the combustion amount.
In addition, the fuel amount G (ie, G / A) per passage cross-sectional area A of the combustion chamber in the hot water combustion main body and the bath combustion main body is always made substantially the same by the common fuel proportional control valve. The distribution rate is always constant regardless of the fluctuation of the combustion amount.
As described above, since the air distribution ratio and the fuel distribution ratio to each combustion main body are constant, a predetermined air-fuel ratio can be maintained in either combustion main body regardless of fluctuations in the combustion amount, and both combustion performances can be maintained. Can be good.
In addition, when replacing with a hot water supply combustion main body having a different hot water supply capacity (number), the amount of fuel per passage cross-sectional area of the bath combustion main body and the combustion chamber is made substantially the same for the newly provided hot water supply combustion main body, Since the passage cross-sectional area of the combustion chamber is set according to the capacity (number), the fuel distribution and the air distribution to each combustion main body have a distribution ratio according to the capacity (number). Therefore, a predetermined air-fuel ratio can be maintained in each combustion body.
Therefore, even if it replaces with the hot water supply combustion main body from which hot water supply capability (number) differs, a predetermined air-fuel ratio is maintained also in the bath combustion main body, and the combustion main body of both the hot water supply side and the bath side can be burned favorably. .
[0011]
Moreover, the bath apparatus with a hot water heater according to claim 3 of the present invention having the above-described configuration is a pressure loss coefficient k (= pressure loss P / air flow velocity v of the hot water combustion main body and the bath combustion main body.²) And the pressure loss P are substantially the same, the air flow velocity v (= air flow rate Q / passage cross-sectional area A of the combustion chamber) of the hot water supply combustion body and the bath combustion body can be made substantially the same. Further, the fuel amount G (that is, G / A) per passing cross-sectional area A of each combustion chamber is substantially the same.
Thus, since Q / A and G / A are substantially the same in each combustion body, the air-fuel ratio of the hot water combustion body and the air-fuel ratio of the bath combustion body are substantially the same. That is, the air-fuel ratio of the bath combustion main body is substantially equal to the air-fuel ratio of the hot water supply combustion main body.
Therefore, when common parts are used for the bath combustion body and the hot water combustion body, the optimum value of the air-fuel ratio is the same for both combustion bodies. It can be burned at a high air / fuel ratio. That is, if the air-fuel ratio of one combustion body is controlled to an optimum value, the air-fuel ratio of the other combustion body can also be controlled to the optimum value.
In addition, when replacing the hot water supply combustion main body having a different hot water supply capacity (number), the air fuel ratio of the bath combustion main body can be made substantially the same as the air fuel ratio of the hot water supply combustion main body, so that both combustion performances can be improved.
[0012]
Moreover, since the bath device with a hot water heater according to claim 4 of the present invention having the above-described configuration is configured so that a fan can be directly connected to the hot water combustion main body, it is provided in a single-function hot water heater that does not have a bath combustion main body. The hot water combustion main body and the fan can be used as they are in a bath apparatus with a hot water heater.
[0013]
Moreover, the bath apparatus with a hot water heater according to claim 5 of the present invention having the above-described configuration not only stores the bath combustion main body, the fan, and the air supply duct in the main body case, but also stores the hot water combustion main body having different hot water supply capabilities. Therefore, the main body case can be shared.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the bath apparatus with a hot water heater of the present invention will be described below.
FIG. 1 shows a bath apparatus 1 with a water heater as an embodiment.
The bath apparatus 1 with a hot water heater includes a bath combustion main body 60, a hot water combustion main body 70, a common fan 18, and a common air supply duct 35, and each component is housed in the main body case 2. The fan 18 is driven by a fan motor 19 and is stored in the fan case 17, the bath combustion main body 60 is stored in the bath combustion case 49, and the hot water supply combustion main body 70 is stored in the hot water supply combustion case 59.
[0015]
The bath combustion main body 60 includes a bath circuit 40 that circulates bath water, a bath burner 41 that heats the bath circuit 40 from below, a bath heat exchanger 42 that includes a plurality of fins 42a at predetermined intervals and heats bath water. Is provided. A space formed between the bath burner 41 and the bath heat exchanger 42 is referred to as a bath combustion chamber 48.
The bath circuit 40 forms a circulation heating circuit with a return pipe 46 that sends bathtub water to the bath heat exchanger 42 and an outgoing pipe 47 that sends bathtub water heated by the bath heat exchanger 42 to the bathtub 20, and returns. A bypass pipe 34 is provided that connects the pipe 46 and the forward pipe 47 to bypass the bath heat exchanger 42.
The return pipe 46 is provided with a bath water thermistor 24 that detects the temperature of hot water before reheating, a circulation pump 22 that circulates bathtub water, and a water flow switch 23 that confirms the flow of the circulating water in order from the upstream side.
The forward pipe 47 is provided with a bath hot water thermistor 25 that detects the hot water temperature after reheating in the vicinity of the bath heat exchanger 42.
[0016]
On the other hand, the hot water supply combustion body 70 includes a hot water supply circuit 50 that supplies water, a hot water supply burner 51 that heats the hot water supply circuit 50 from below, and a plurality of fins 52a that are spaced from each other by a predetermined interval to heat the hot water. 52.
The space formed between the hot water supply burner 51 and the hot water supply heat exchanger 52 is called a hot water combustion chamber 58. The height and depth of the hot water combustion chamber 58 are equal to the bath combustion chamber 48, while the width Dimensions are formed in proportion to maximum capacity. That is, when the maximum capacity of the bath combustion main body is No. 6 and the maximum capacity of the hot water supply combustion main body is No. 24, the width dimension of the hot water combustion chamber 58 is four times that of the bath combustion chamber 48.
In the hot water supply circuit 50, in order from the upstream side, a flow rate sensor 26 that detects the amount of incoming water, a hot water supply and incoming water thermistor 27 that detects the incoming water temperature, a water amount control motor 28 that adjusts the amount of water flow to obtain a set hot water temperature, and heat exchange. A hot water supply heat exchanger outlet thermistor 12 for detecting the temperature of the hot water later is provided. The hot water supply burner 51 includes three sets of burner groups having different combustion capacities, and the burner group that burns is switched according to the amount of combustion.
[0017]
Further, the hot water supply circuit 50 is provided with a bypass passage 36 that connects the upstream and downstream of the hot water supply heat exchanger 52, and a bypass valve 14 that opens and closes the bypass passage 36.
The downstream flow path of the bypass passage 36 branches into a general hot water supply pipe 37 communicating with the hot water supply curan 21 in the kitchen and a drop pipe 30 for supplying hot water to the bathtub 20.
The general hot water supply pipe 37 is provided with a hot water supply and hot water thermistor 15 that detects the temperature of the hot water mixed with the water passing through the bypass passage 36 and the hot water after heat exchange.
The dropping pipe 30 connects the hot water supply circuit 50 and the bath circuit 40. The dropping solenoid valve 31 that opens and closes the dropping pipe 30 and the dropping flow rate that detects the flow rate from the hot water supply circuit 50 to the bath circuit 40 in order from the upstream side. A sensor 32 and two check valves 33 for preventing backflow are provided.
[0018]
The gas flow path is provided with an original solenoid valve 10 that opens and closes the gas flow path and a proportional valve 11 that controls the gas flow rate according to the energization amount in order from the upstream side, and the hot water supply side gas flow path and the bath on the downstream side. Branches to the side gas flow path. On the hot water supply side, hot water supply electromagnetic valves 55, 56, and 57 that open and close the gas flow paths to the three groups of burners independently are provided, and independent combustion control is performed. On the other hand, a bath electromagnetic valve 45 for opening and closing the bath side gas flow path is provided on the bath side.
[0019]
The bath burner 41 and the hot water supply burner 51 are provided with electrodes 43 and 53 for igniting gas by the operation of the igniter 13 and frame rods 44 and 54 for detecting a combustion flame. Are connected to each other to perform predetermined control such as hot water, reheating, and stopping.
[0020]
The bath combustion case 49 and the hot water supply combustion case 59 are provided side by side on the upper side of the common air supply duct 35, and an air supply inlet 49 a that communicates with the air supply duct 35 is provided on the bottom surface of each combustion case 49, 59. 59a is formed. The air supply inlet 59a is formed on the bath combustion main body 40 side (leftward in FIG. 1).
Combustion air from the fan 18 is supplied simultaneously to the bath combustion case 49 and the hot water supply combustion case 59 through the supply duct 35 from the supply inlets 49a and 59a. The air supply duct 35 has a large volume, and therefore the pressures at the air supply inlets 49a and 59a are substantially the same.
[0021]
As shown in FIG. 2, the air supply duct 35 includes a duct body 35a that is screwed to the fan case 17 and a duct lid 35b that is screwed to the bottom surfaces of the combustion cases 49 and 59. The outer periphery of both is crimped and connected.
An air supply inlet 59a formed on the bottom surface of the hot water supply combustion case 59 and a lid opening 35f formed on the duct lid 35b face each other, and a main body opening 35e formed on the bottom surface of the duct main body 35a and the fan case 17 The two outlets 17a face each other and are fastened with screws at two front and rear positions.
That is, the burring hole and the round hole are opened at the opposed positions, and the air supply duct 35 and the fan case 17 are detachable.
[0022]
Specifically, screws are inserted into a burring hole 59d formed in the hot water supply combustion case 59 and a round hole 35d formed in the duct lid 35b.
Further, screws are inserted into the burring hole 35c formed on the bottom surface of the duct body 35a and the round hole 17c formed on the blow-out surface of the fan case 17.
The burring holes 59d and the burring holes 35c are opened with the same diameter and the same pitch, and the round holes 17c of the fan case 17 and the burring holes 59d of the hot water supply combustion case 59 can be directly screwed. The bath combustion case 49 is also screwed to the duct lid 35b, but this need not have the same pitch as the burring holes 35c.
[0023]
When the hot water supply combustion case 59 and the duct lid 35b are connected, a screwdriver is inserted through a screw insertion hole (not shown) opened in the duct main body 35b and then connected. Cover with the flange of the fan case 17.
[0024]
As shown in FIG. 1, a bath distribution plate 62 having a plurality of distribution holes 62a is provided at the bottom of the bath combustion case 49, while a plurality of distribution holes 72a are open at the bottom of the hot water combustion case 59. A hot water distribution plate 72 is provided.
Further, a bath exhaust port 61 and a hot water supply exhaust port 71 for guiding the combustion gas after heat exchange to the outside of the main body case 2 are slightly above the width dimensions of the combustion cases 49 and 59 at the upper part of the bath combustion case 49 and the hot water supply combustion case 59. Each is formed with a small width dimension.
[0025]
Next, the general hot water supply operation will be described.
When the hot water supply currant 21 is opened, the water flowing in from the water inlet flows toward the hot water supply heat exchanger 52. When the water flow rate reaches a predetermined amount by the flow sensor 26, pre-purging is performed by the rotation of the fan 18, and then the hot water supply burner 51 is ignited to start proportional control.
The hot water temperature is kept constant by continuously changing the gas flow rate by opening / closing each of the hot water supply electromagnetic valves 55, 56, 57 and the proportional valve 11. Moreover, since the water amount control motor 28 adjusts the water amount to an appropriate amount, the maximum amount of hot water is always secured.
When the hot water supply currant 21 is closed, it is detected by the flow sensor 26 that the water has stopped, the gas supply is stopped, the fire is extinguished, and the fan 18 is stopped after the post-purge operation.
[0026]
Next, the automatic hot water supply operation | movement to the bathtub 20 is demonstrated.
When a bath automatic switch (not shown) is pressed, the dropping solenoid valve 31 is turned ON. After the water flow is detected, the hot water supply burner 51 performs hot water combustion operation by proportional control, and hot water at a set temperature is dropped into the flow sensor 32 and check valve. The hot water is supplied to the bathtub 20 through 33.
When the amount of water detected by the drop flow sensor 32 reaches the set water amount, the drop solenoid valve 31 is turned OFF, the hot water supply combustion is stopped, the circulating pump 22 of the bath circuit 40 is driven, the hot water temperature is checked, and until the set temperature is reached. Circulate heating and sound a notification buzzer (not shown) to notify the completion of filling.
[0027]
After hot water filling, the temperature is controlled to keep warm, and the bath water temperature is checked by a bath water thermistor 24 at a predetermined interval (for example, every 10 minutes). Control to maintain. When the bath automatic switch is pressed, all operations are stopped.
[0028]
Next, a case where the hot water supply operation and the memorial operation are performed simultaneously will be described.
First, the air sent out from the fan case 17 has a uniform pressure in the air supply duct 35 having a large capacity, and is distributed to the bath combustion case 49 and the hot water supply combustion case 59.
[0029]
The air supplied to the bottom surfaces of the bath combustion case 49 and the hot water supply combustion case 59 is mixed with fuel gas in the bath burner 41 and hot water burner 51 as primary combustion air, or the distribution holes of the bath distribution plate 62 as secondary air. 62a is rectified while passing through the distribution hole 72a of the hot water supply distribution plate 72 and is evenly supplied to each flame outlet (not shown) of each burner 41, 51.
The combustion gas passes through between the fins 42 a and 52 a of the heat exchangers 42 and 52 and transmits the combustion heat to the bath circuit 40 and the hot water supply circuit 50, and then from the bath exhaust port 61 and the hot water supply exhaust port 71. It is guided to the outside of the main body case 2 (atmospheric pressure).
[0030]
The water heater-equipped bath apparatus 1 controls the gas supply to the combustion main bodies 60 and 70 by a common proportional valve 11. In order to supply hot water at a target temperature, the hot water supply combustion main body 60 is given priority. Adjust supply (input) and air supply.
Thereby, although the hot water supply burner 51 can be burned at a good air-fuel ratio, the bath burner 41 cannot adjust the gas flow rate and the air flow rate independently of the hot water supply burner 51.
Therefore, it is desired that the air flow rate to the bath burner 41 is automatically made proportional to the gas flow rate change to the bath burner 41 and maintained at the same air-fuel ratio as the hot water supply burner 51. That is, it is necessary to make the air distribution amount to each combustion main body 60, 70 constant.
It will be described that a necessary condition for this is to make the pressures of the intake inlet portions 49a and 59a of the combustion main bodies 60 and 70 substantially the same. In the following formula, 1 at the end of the symbol means the hot water supply side, and 2 at the end means the bath side.
[0031]
Since the air-fuel ratio at which the combustion performance is good in both combustion bodies is the same, it is necessary to make the ratio of the fuel flow rate G and the air flow rate Q equal in each combustion body. That means
G1 / Q1 = G2 / Q2 (Formula 1)
The conditions necessary for satisfying Equation 1 will be obtained.
In addition, let the flow volume here be the volume which flows per unit time.
[0032]
Further, the combustion chamber load (input Ip / combustion chamber volume) has an appropriate range for improving the combustion performance and the durability of the combustion main body. Both combustion bodies are designed to fall within that range, and the combustion chamber loads of both combustion bodies are always substantially the same. In addition, since the height of each combustion chamber is equal, "input Ip / passage cross-sectional area A of the combustion chamber" is also equal.
Since the input Ip is proportional to the gas flow rate G, the following equation is established.
G1 / A1 = G2 / A2 (Formula 2)
[0033]
Here, the pressure loss of the hot water combustion main body 70 is P1, and the pressure loss of the bath combustion main body 60 is P2. It is known that the pressure loss P is generally proportional to the square of the flow velocity, and the pressure loss coefficient is k. The air flow rate is air flow rate Q / combustion chamber passage cross-sectional area A. Therefore,
P1 = k1 × (Q1 / A1)²  ... (Formula 3)
P2 = k2 × (Q2 / A2)²  ... (Formula 4)
Modifying Equation 3 and Equation 4 respectively
(Q1 / A1)²= P1 / k1 (Formula 5)
(Q2 / A2)²= P2 / k2 (Formula 6)
From Equation 1 and Equation 2,
Q2 / A2 = Q1 / A1 (Formula 7)
Substituting Equations 5 and 6 into Equation 7,
P1 / k1 = P2 / k2 (Formula 8)
Equation 8 is transformed
P1 / P2 = k1 / k2 (Formula 9)
Therefore, by designing the combustion main bodies 60 and 70 so that Equation 9 is satisfied, Equation 1 is satisfied and the combustion performance can be improved.
[0034]
Here, the hot water supply combustion main body 70 and the bath combustion main body 60 use a burner group having the same structure,
k1 = k2 (Formula 10)
Substituting equation 10 into equation 9, P1 = P2
Therefore, if the pressure loss P1 of the hot water supply combustion body 70 and the pressure loss P2 of the bath combustion body 60 are designed to be equal, the air-fuel ratio can be made equal. By the way, since the pressures of the hot water supply exhaust port 71 and the bath exhaust port 61 are both atmospheric pressures, the pressures of the supply air inlets 49a and 59a of the respective combustion main bodies may be designed to be equal.
[0035]
As a result, each combustion body 60, 70 has the same gas flow rate G / A per passage cross-sectional area of the combustion chamber, and each combustion body 60, 70 has the same pressure loss coefficient k. In the bath apparatus 1 with a hot water heater in which the main bodies 60 and 70 are formed, if the pressures of the respective air inlets 49a and 59a are made equal by a method such as increasing the volume of the air supply duct 35, both the combustion main bodies 60 and 70 have the same structure. Combustion performance can be improved.
[0036]
By the way, when the target hot water supply temperature is changed, the gas flow rate to the hot water supply burner 51 is controlled by the common proportional valve 11 in preference to the bath burner 41, so the hot water supply burner 51 is burned at a good air-fuel ratio. Can do.
On the other hand, the bath burner 41 cannot adjust the gas flow rate or the air flow rate independently of the hot water supply burner 51, but the pressure of each of the air supply inlet portions 49a and 59a is substantially equal, so the air distribution ratio is constant, At the time of simultaneous combustion with the hot water supply burner 51, the air-fuel ratios of the combustion main bodies 60 and 70 become equal.
That is, as the input is changed, the amount of air distributed to each combustion main body 60, 70 varies appropriately, so that the air-fuel ratio is maintained in the same manner as the hot water supply burner 51 and combustion can be performed satisfactorily.
[0037]
Next, instead of the hot water supply combustion main body 70, the combustion performance when a hot water supply combustion main body M (not shown) whose hot water supply capacity is m times that of the hot water supply combustion main body 70 is provided will be described. In addition, in the following formula | equation, 3 at the end of a code | symbol means the hot water supply side, and 2 at the end means the bath side. The hot water supply combustion body M is provided with m times as many burner groups as the burner groups of the hot water combustion body 70, and the passage cross-sectional area of the hot water combustion chamber also becomes m times in proportion to the number of burner groups.
[0038]
Since each combustion main body M, 49 is provided with the above-described supply duct 35, the pressure at each supply inlet is equal, and the pressure loss P is also equal.
P3 = P1 (Formula 11)
In the hot water supply combustion body M, by making the bath combustion body 60 and the burner structure the same,
k3 = k1 (Formula 12)
Therefore, the expression of the pressure loss P3 of the hot water supply combustion body M is
P3 = k3 × (Q3 / A3)²  ... (Formula 13)
Substituting Equation 3, Equation 11, and Equation 12 into Equation 13,
Q3 / A3 = Q1 / A1 (Formula 14)
[0039]
Since the hot water supply capacity of the hot water supply combustion main body M is m times that of the hot water supply combustion main body 70, the gas flow rate G and the passage cross-sectional area A of the combustion chamber are also each m times, and the ratio G / A is also equal.
G3 / A3 = G1 / A1 (Formula 15)
From Equation 14 and Equation 15,
G3 / Q3 = G1 / Q1 (Formula 16)
From Equation 1 and Equation 16,
G3 / Q3 = G2 / Q2 (Expression 17)
Accordingly, the air-fuel ratio becomes equal between the hot water supply combustion main body M and the bath combustion main body 60.
[0040]
Thus, even when the hot water supply combustion main body M having different hot water supply capacities is provided, it is easily burned at an appropriate air-fuel ratio on both the bath side and the hot water supply side only by making the combustion structure identical to the bath combustion main body 60. Can be burned well.
Further, since the combustion chamber loads are substantially the same, the combustion performance and the durability of the parts can be improved in both the hot water combustion main body and the bath combustion main body.
[0041]
In order to make the pressure loss coefficients k of the combustion bodies 60 and 70 equal, the fins 42a and 52a of the heat exchangers 42 and 52, the distribution holes 62a and 72a of the distribution plates 62 and 72, and the burners What is necessary is just to use the same thing as components used as 41 and 51, such as 41 and 51. Furthermore, the air flow rate Q at the same pressure can be adjusted by designing the ratios of the capacities (numbers) of the combustion main bodies 60 and 70 to be equal to the number of the above parts.
[0042]
An air supply inlet 59a of the hot water supply combustion case 59 is provided on the bath combustion case 49 side (FIG. 1, left side). In the type in which the hot water supply capacity (number) is increased, the hot water combustion case 59 is formed so that the width of the hot water combustion case 59 is expanded outward (right side in FIG. 1), but the size and formation position of the air supply inlet 59a are the same.
For this reason, the hot water supply combustion case 59 having different hot water supply capabilities can be attached to and detached from the air supply duct 35. For example, as shown in FIGS. 3 and 4, a hot water supply combustion case 59B of a hot water supply combustion main body having a small hot water supply capacity (here, No. 16) can also be detached from the air supply duct 35, and the fan 18, the bath combustion main body 60, etc. Other parts can be the same.
[0043]
In the hot water supply combustion main body 70 having a large hot water supply capacity, the width of the hot water distribution plate 72 increases in proportion and the number of distribution holes 72a increases in proportion, and the widths of the hot water heat exchanger 52 and the hot water discharge port 71 also increase. Since the pressure loss coefficient k of the hot water supply combustion body 70 is equal to that of the hot water supply combustion body having a small hot water supply capacity, the bath combustion main body 60 and the hot water supply combustion body 70 can be easily adjusted without any new adjustment. The air-fuel ratio can be made the same. As a result, the combustion performance of both the combustion main bodies 60 and 70 can be improved regardless of the hot water supply capacity.
[0044]
Now, as shown in FIG. 3, the hot water supply combustion case 59 increases in size as the hot water supply capacity increases. This bath apparatus 1 with a water heater is provided outside the No. 16 hot water combustion case 59B (right side in the figure) 24 so that any hot water combustion case 59 can be accommodated in the body case 2 of the same size regardless of the hot water supply capacity. A spare space 38 that can accommodate the hot water supply combustion case 59 is formed, and the main body case 2 is shared.
[0045]
Therefore, the manufacturing cost of the main body case can be reduced, and the mounting dimensions of the main body are constant regardless of the hot water supply capacity, making it easy to install and install when replacing, and packaging such as cardboard boxes for storing hot water bath equipment. Molded items such as containers and foamed polystyrene that can be placed in a cardboard box so that the container is not damaged during transportation can be used in common.
Furthermore, in the case where the instruction manual for the hot water bath apparatus with different hot water supply capacity is also used, since the outer dimensions are the same, it is not necessary to display dimensions according to each hot water supply capacity, and the instruction manual is easy to read. Also, parts management becomes easy.
[0046]
Further, since the burring holes 59d of the hot water supply combustion case 59 and the burring holes 35c of the duct main body 35a are formed with the same diameter and the same pitch, as shown in FIG. The fan 18 can be connected to 59B, and it can also be used as a water heater having only a hot water supply function. Thereby, the parts of the water heater and the bath device with the water heater can be made common, and the manufacturing cost is reduced.
[0047]
As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, it can implement in a various aspect in the range which does not deviate from the meaning of this invention.
For example, a resistor such as a punching metal may be provided in the air supply duct 35 to equalize the pressure at the air supply inlets 49a and 59a of the bath combustion main body 60 and the hot water supply combustion main body 70.
[0048]
Further, the pressure loss coefficients k of the combustion main bodies 60 and 70 need not be the same. In this case, since the air distribution ratio and the fuel distribution ratio to each combustion main body 60, 70 are constant, a predetermined air-fuel ratio can be maintained in each combustion main body 60, 70 regardless of the fluctuation of the combustion amount, Both combustion performances can be improved.
In other words, when the target hot water supply temperature is changed, even if the combustion amount of the hot water supply burner 51 is changed, the gas distribution ratio is constant and the pressures of the fuel supply inlet portions 49a and 59a are substantially equal. Therefore, the air-fuel ratio of the bath burner 41 is kept constant similarly to the hot water supply burner 51 and can be burned well.
[0049]
【The invention's effect】
  As described above in detail, according to the bath apparatus with a hot water heater according to claim 1 of the present invention, it communicates with the air supply duct of the hot water combustion main body.Supply air inletThe hot water supply capacityHowRegardless of the shape, the hot water supply combustion bodies having different hot water supply capacities can be attached to and detached from the same air supply duct, so that the air supply duct can be made common and the manufacturing cost is reduced.
[0050]
Further, according to the bath apparatus with a hot water heater according to claim 2, the pressure at each air inlet in the hot water combustion main body and the bath combustion main body and the fuel amount per passage cross-sectional area of the combustion chamber are substantially the same. Even if a common fuel proportional control valve is used, a predetermined air-fuel ratio can be maintained in each combustion body irrespective of fluctuations in the combustion amount, both combustion performances can be improved, and incomplete combustion can be prevented, which is safe. .
Furthermore, even when using hot water combustion main bodies having different hot water supply capacities, the fuel distribution and air distribution to each combustion main body have a distribution ratio corresponding to the capacities, so that a predetermined air-fuel ratio can be maintained even in the bath combustion main body. The combustion main body on both the side and the bath side can be burned well.
[0051]
According to the bath apparatus with a hot water heater according to claim 3, since the pressure loss coefficients of the hot water combustion main body and the bath combustion main body are substantially the same, the air-fuel ratio is substantially the same in the hot water combustion main body and the bath combustion main body. Become.
Therefore, even if the manufacturing cost is reduced by using common parts for the bath combustion body and the hot water combustion body, the optimum value of the air-fuel ratio is the same for both combustion bodies. The combustion main body can be burned at a suitable air-fuel ratio. Similarly, when replacing with a hot water supply combustion main body having a different hot water supply capacity (number), combustion performance can be improved even if common parts are used.
[0052]
According to the bath device with a hot water heater according to claim 4, since the fan can be directly connected to the hot water combustion main body, the hot water combustion main body and the fan provided in the single-function hot water heater are directly attached with the hot water heater. It can be used for a bath apparatus, can share parts, and can reduce manufacturing costs.
[0053]
In addition, according to the bath apparatus with a hot water heater according to claim 5, since the hot water combustion main bodies having different hot water supply capacities are housed in the main body case of the same size, the main body case can be shared, and the manufacturing cost of the main body case is reduced. it can. Moreover, the mounting dimensions of the vessel body are constant regardless of the hot water supply capacity, and mounting is easy.
In addition, a packaging container for storing the bath device with a hot water heater and a packaging material such as foamed polystyrene placed in the packaging container so that the container body is not damaged during transportation can be used in common, and the manufacturing cost is reduced.
Furthermore, when the instruction manual for the hot water bath apparatus with different hot water supply capacity is also used, since the external dimensions are the same, it is not necessary to display dimensions according to each hot water supply capacity, making it easy to read the instruction manual.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a bath apparatus with a water heater as viewed from the front.
FIG. 2 is a cross-sectional view of an air supply unit as viewed from the side.
FIG. 3 is a schematic configuration diagram of a bath apparatus with a water heater as viewed from the front.
FIG. 4 is a schematic explanatory view of a bath apparatus with a water heater as viewed from the front.
FIG. 5 is a schematic explanatory view of a water heater as viewed from the front.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Bath apparatus with water heater, 2 ... Main body case, 17 ... Fan case, 18 ... Fan, 35 ... Air supply duct, 40 ... Bath circuit, 41 ... Bath burner, 42 ... Bath heat exchanger, 42a ... Fin, 49 ... Bath combustion case, 49a ... Air supply inlet, 50 ... Hot water supply circuit, 51 ... Hot water supply burner, 52 ... Hot water supply heat exchanger, 52a ... Fins, 59 ... Hot water supply combustion case, 59a ... Hot water supply inlet, 60 ... Bath combustion main body, 62 ... Bath distribution plate, 70 ... Hot water combustion body, 72 ... Hot water distribution plate.

Claims (5)

A bath combustion body that circulates and heats the bathtub water flowing through the bath heat exchanger by the combustion heat of the bath burner,
A hot water supply combustion main body that heats and controls the water flow of the hot water supply heat exchanger to a target temperature by the combustion heat of the hot water supply burner;
A fan for supplying combustion air;
With a bath combustion body connection opening, the air supply duct and a hot water supply combustion body connection opening,
Connect the hot water combustion main body to the bath combustion main body side connection opening of the air supply duct, and connect the hot water combustion main body of one of the hot water combustion bodies of different capacities to the hot water combustion main body side connection opening, The duct communicates with the bath combustion body and hot water combustion body,
In the bath apparatus with a hot water heater for distributing and supplying combustion air from the fan to the combustion main bodies through the connection openings of the air supply duct,
The air supply inlet of the water heater combustion body to upper Kikyuki duct communicating with, and formed with how regardless as large as the hot water supply capability, removably different water heater combustion body of hot water supply capacity to the common supply duct A bath apparatus with a water heater, characterized by A fuel supply path that is branched in the middle and supplies fuel to each of the hot water supply combustion main body and the bath combustion main body, and a fuel that is provided upstream of the branch point of the fuel supply path and controls the combustion amount of each combustion main body A proportional control valve is provided , and the amount of fuel per passage cross-sectional area of the combustion chamber in each combustion body is formed to be substantially the same, and the pressure at the intake inlet of each combustion body is made to be substantially the same. Item 1. A bath apparatus with a water heater according to item 1. Each combustion body is formed so that the pressure loss coefficient of each combustion body is substantially the same, and the air flow rate per passage cross-sectional area on the combustion hot water supply body side and the air flow rate per passage cross-sectional area on the bath combustion body side The bath apparatus with a hot water heater according to claim 2, wherein the same is used. The bath apparatus with a hot water heater according to any one of claims 1 to 3, wherein the fan can be directly connected to an air supply inlet of the hot water combustion main body.   The hot water heater according to any one of claims 1 to 4, wherein the bath combustion main body, the fan, the air supply duct, and a main body case for housing the hot water combustion main body are shared regardless of the hot water supply capacity. Bath equipment with bath.

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