JP5911107B2 - 1 can type combined heat source machine - Google Patents

Description

  The present invention includes a single can body, a first and second pair of burners provided side by side in the can body, and a first and second pair provided side by side on the top of the can body. The present invention relates to a single can type combined heat source apparatus including a heat exchanger.

  Conventionally, in this type of single can type combined heat source machine, the space between the first and second burners and the first and second heat exchangers in the can is transferred from the first burner to the first heat exchange. A partition wall that divides into a first combustion chamber leading to the furnace and a second combustion chamber leading from the second burner to the second heat exchanger, and burns only one of the burners, for example, the second burner to perform the second heat exchange At the time of single combustion for heating the heat exchanger, it is possible to prevent a problem that the combustion gas of the second burner flows to the first heat exchanger side and the first heat exchanger is heated. Further, an air supply chamber partitioned by a distribution plate is defined at the lower part of the can body, and the first and second combustion air from a single combustion fan is distributed through the distribution holes formed in the distribution plate from the air supply chamber. The fuel is supplied to both the second combustion chambers.

  Conventionally, at least a part of the partition wall part facing both the first and second combustion chambers is formed hollow, and the hollow part has a temperature-sensitive part at the tip from the front or rear of the can body. There is also known a single can type combined heat source machine in which the temperature sensor is inserted (see, for example, Patent Document 1).

  Here, when fin clogging of one heat exchanger of the first heat exchanger and the second heat exchanger occurs, it is drawn by the air flow or exhaust flow flowing through the other heat exchanger, Combustion gas in one combustion chamber corresponding to the heat exchanger flows toward the partition wall and heats the partition wall. If a temperature sensor is inserted into the hollow portion of the partition wall as in the above-described conventional example, when the fin clogging of one heat exchanger occurs, the temperature detected by the temperature sensor rises and fin clogging occurs. Can be detected.

  By the way, in the thing of the said prior art example, the obstruction | occlusion part which obstruct | occludes the clearance gap between both 1st and 2nd heat exchangers is provided in the partition wall over the whole front-back direction of a partition wall, and the 1st and 2nd These combustion chambers are not communicated with the gap between the first and second heat exchangers. In this case, when one of the heat exchangers is clogged with fins, the combustion gas in one combustion chamber drifts to the partition wall side in a wide range in the front-rear direction, and the partition wall is heated relatively weakly over a wide range. Will be. Therefore, in order to ensure detection accuracy of fin clogging, it is necessary to dispose the temperature sensing part of the temperature sensor in a relatively wide range in the center part in the front-rear direction of the partition wall where the temperature is highest, resulting in an increase in cost.

JP 2011-21873 A

  In view of the above, it is an object of the present invention to provide a single can type combined heat source apparatus that can secure fin clogging detection accuracy without widening the arrangement range of the temperature sensing part of the temperature sensor. Yes.

In order to solve the above-mentioned problems, the present invention provides a single can body, a first and second pair of burners provided side by side in the can body, and provided side by side on the top of the can body. The space between the first and second pair of heat exchangers, the first and second burners in the can, and the first and second heat exchangers is transferred from the first burner to the first heat. A partition wall partitioning into a first combustion chamber leading to the exchanger and a second combustion chamber leading from the second burner to the second heat exchanger, and an air supply chamber partitioned by a distribution plate at a lower portion of the can body A single-can type combined heat source that is configured to supply combustion air from a single combustion fan to both the first and second combustion chambers through distribution holes formed in the distribution plate from the supply chamber. And at least a part of the part of the partition wall facing both the first and second combustion chambers is formed in a hollow shape, and the temperature is applied to the hollow portion from the front or the rear of the can body to the tip. In the case where a rod-shaped temperature sensor having a gap is inserted, a partition wall is provided with a closing portion for closing the gap between the first and second heat exchangers, and the temperature sensor is located In the predetermined front-rear direction range of the partition wall including, the first and second combustion chambers communicate with the gap between the first and second heat exchangers without providing the closing portion, Is characterized in that it is formed in a cylindrical cross section that abuts the lower end of the side edge of the fin of each heat exchanger and closes the gap between the two heat exchangers from below .

  According to the present invention, when fin clogging of one heat exchanger occurs, the air flow passing through the other heat exchanger that acts on the combustion gas in one combustion chamber corresponding to the one heat exchanger. And the suction force due to the exhaust flow works strongly in the part where the closed part is not provided, and the drift of the combustion gas in one combustion chamber toward the partition wall side tends to occur toward the part where the closed part is not provided. . For this reason, the range where the partition wall is not provided with a closed portion, that is, the range where the temperature sensor of the temperature sensor is located is heated strongly, and fin clogging is not required even if the temperature sensor is not widened. Detection accuracy can be ensured and the cost of the temperature sensor can be reduced.

  Further, in the present invention, when the fin of one heat exchanger is clogged, the range of the partition wall where the temperature sensing unit is located is strongly heated, so the temperature sensing unit is arranged in the front-rear direction of the partition wall as in the conventional example. It does not need to be located in the central part. And if the temperature sensing part of a temperature sensor is located in the insertion direction near side of a temperature sensor rather than the center in the front-back direction of a partition wall, a temperature sensor can be shortened and a further cost reduction can be aimed at.

The cutting front view showing the 1 can type compound heat source machine of the embodiment of the present invention. FIG. 2 is a cut side view taken along line II-II in FIG. 1. The cut front view of the principal part cut | disconnected by the III-III line | wire of FIG.

FIG. 1 shows a single can type combined heat source machine having a hot water supply function and a bath reheating function. With the composite heat source machine, and a second burner 2 ₂ for the first burner 2 ₁ and bath hot water supply provided side by side in the lateral direction in a single can body 1, transverse to the top of the can body 1 Tile and a second heat exchanger 3 ₂ for the first heat exchanger 3 ₁ the bath hot water supply provided in the.

In the lower part of the can body 1, an air supply chamber 5 partitioned by a distribution plate 4 with respect to the space in the can body 1 is defined. A single combustion fan 6 driven by a fan motor 6 a is connected to the supply chamber 5. Then, air from the combustion fan 6 enters the first and second combustion chambers 7 ₁ and 7 _{2, which} will be described later, in the can 1 through a number of distribution holes 4 a formed in the distribution plate 4 from the air supply chamber 5. It is supplied as secondary air for combustion.

Each of the first and second burners 2 ₁ and 2 ₂ is configured by arranging a plurality of unit burners 2a that are long in the front-rear direction (in the direction orthogonal to the plane of FIG. 1) as the depth direction of the can 1 Has been. As shown in FIG. 2, each unit burner 2a includes a lower mixing tube portion 2b extending in the front-rear direction. And the front part of the distribution plate 4 is bent upward, the rising part 5a is formed in the front part of the air supply chamber 5, and the inflow end of each mixing pipe part 2b is made to face this rising part 5a. The front surface of the rising portion 5a of the air supply chamber 5 is closed by a gas manifold 2c, and a gas nozzle 2d facing the mixing tube portion 2b of each unit burner 2a is provided in the gas manifold 2c. The fuel gas is supplied from each gas nozzle 2d to the mixing pipe portion 2b of each unit burner 2a, and the primary combustion air is supplied to the mixing pipe portion 2b from the rising portion 5a.

Each of the first and second heat exchangers 3 ₁ , 3 ₂ includes a heat absorbing fin 3 a that is stacked in a large number in the front-rear direction, and a meandering heat absorbing tube 3 b that passes through the heat absorbing fin 3 a. The Although not shown, an upstream water supply pipe and a downstream hot water outlet pipe are connected to the heat absorption pipe 3b of the first heat exchanger 31, and a _first hot water tap is opened at the downstream end of the hot water outlet pipe. when passed through the exchanger 3 _1, is ignited first burner 2 _1, the hot water set temperature from hot water tap is tapped. The second heat absorbing tube 3b of the heat exchanger 3 _2, although not shown, bathtub via the return forward pipe line is connected, via a water through the second heat exchanger 3 ₂ in the bathtub when circulating Te and ignited in the second burner 2 _2, bath reheating is carried out. Since the direction of reheating bath than hot water supply less demand heating capacity, the second burner 2 ₂ smaller than a second heat exchanger 3 ₂ are each first burner 2 ₁ and the first heat exchanger 3 ₁ It has become.

Further, in the can 1, a space between the first and _second burners 2 ₁ and 2 ₂ and the first and second heat exchangers 3 ₁ and 3 ₂ is provided as a first burner 2 _1. and a first combustion chamber ₇₁ leading to the first heat exchanger 3 _1, and the partition wall 8 is provided for partitioning the second burner 2 ₂ second combustion chamber 7 ₂ reaching the second heat exchanger 3 ₂ Yes. Therefore, the first combustion gas of the burner 2 ₁ is led to the first heat exchanger 3 ₁ through the first combustion chamber _71, the combustion gas of the second burner 2 ₂ through the second combustion chamber 7 _Paragraph 2 is guided to the heat exchanger _{3 2.} Combustion gas heat exchange with the first and second of each heat exchanger 3 _1, 3 _2, flows to a common exhaust hood 9 which constitutes the exhaust passage that is disposed above the two heat exchangers 3 _1, 3 _2, The gas is discharged to the outside through an exhaust port 9a (see FIG. 2) formed in the exhaust hood 9.

Partition wall 8, first combustion chamber ₇₁ side and the second combustion chamber 7 ₂ side of the two wall panels 8a, is composed of 8a. A space is provided between the wall plates 8 a, 8 a below the partition wall 8, and this space communicates with the air supply chamber 5 through a communication hole 4 b formed in the distribution plate 4. Further, a shoulder portion that is bent inward in the lateral direction is formed in the middle in the vertical direction of both wall plates 8a, 8a, and both are formed above the partition wall 8 facing both the first and second combustion chambers 7 ₁ , 7 _2. The wall plates 8a and 8a are in close contact with each other. And the vent hole 8b is formed in the shoulder part of both wall board 8a, 8a. According to this, air from the air supply chamber 5 flows through the gap between the wall plates 8a and 8a, and air that is ejected from the vent hole 8b flows along the upper outer surface of each wall plate 8a. Therefore, the partition wall 8 is air-cooled by the air from the air supply chamber 5, and the heat resistance of the partition wall 8 is ensured.

Meanwhile, the results in the first heat exchanger 3 ₁ and clogging the fins of the second heat exchanger 3 ₂ and one heat exchanger (blockage of the gap between the heat absorbing fin 3a), both heat exchangers 3 _1, 3 ₂ The exhaust gas flowing through the other heat exchanger flows to the common exhaust hood 9 above the other, and the combustion gas in one combustion chamber corresponding to the one heat exchanger flows toward the partition wall 8 side. . Even if the burner corresponding to the other heat exchanger is not burned, the combustion gas in one combustion chamber is drawn by the air flow flowing from the air supply chamber 5 to the exhaust hood 9 via the other heat exchanger. Flows unevenly toward the partition wall 8 side. And if it uses for a long time as it is, the cooling by the said air will become inadequate, and the partition wall 8 will be damaged by the heat of combustion gas. Further, if the corresponding burner is burned while the fins of one heat exchanger are clogged, defective combustion occurs.

Therefore, both wall plates 8a and 8a are bulged outwardly in a part of the portion of the partition wall 8 facing both the first and second heat exchangers 3 ₁ and 3 ₂ to form the hollow portion 8c. The temperature sensor 10 is inserted into the hollow portion 8c. Then, the signal of the temperature sensor 10 is input to the controller 11, and the detected temperature of the temperature sensor 10 is equal to or higher than a predetermined threshold at the time of single combustion of only one of the _first and second burners 2 ₁ , 2 _2. When it becomes, it is judged that the fin clogging of one heat exchanger corresponding to one burner during combustion has occurred, and combustion of one burner is prohibited.

  The temperature sensor 10 has a built-in temperature sensing portion 10a composed of a temperature sensing element such as a thermistor at the tip of a hollow rod-shaped sensor body. Then, as shown in FIG. 1, the temperature sensor 10 is inserted into the hollow portion 8 c of the partition wall 8 from the front of the can body 1, and the fixing portion 10 b on the tail end side of the temperature sensor 10 is fixed to the front surface of the can body 1. Yes.

Further, as shown in FIG. 3, the partition wall 8 is provided with a closing portion 8d for closing the gap between the first and second heat exchangers 3 ₁ and 3 ₂ . In addition, the closing part 8d is comprised by the bulging part contact | abutted to the side edge part lower end of the fin 3a of each heat exchanger 3 ₁ and 3 ₂ formed in the upper end part of both wall board 8a, 8a. That is, the closing portion 8d is formed in a cylindrical cross section that contacts the lower end of the side edge of the fin 3a of each of the heat exchangers 3 ₁ and 3 ₂ and closes the gap between the heat exchangers 3 ₁ and 3 ₂ from below. Has been.

  By the way, when the closed portion 8d is provided over the entire front and rear direction of the partition wall 8, when one of the heat exchangers is clogged with fins, the drift of the combustion gas in the one combustion chamber toward the partition wall 8 is caused to flow back and forth. It occurs over a wide area and the partition wall 8 is heated relatively weakly over a wide area. Therefore, in order to ensure the detection accuracy of fin clogging, it is necessary to arrange the temperature sensing part 10a of the temperature sensor 10 in a relatively wide range in the center part in the front-rear direction of the partition wall 8 where the temperature becomes the highest, which increases costs Invite.

Therefore, in the present embodiment, in the predetermined front-rear direction range of the partition wall 8 including the portion where the temperature sensing portion 10a of the temperature sensor 10 is located, the first and second portions are not provided in the partition wall 8 without providing the closing portion 8d. Both combustion chambers 7 ₁ and 7 ₂ communicate with the gap between the first and second heat exchangers 3 ₁ and 3 ₂ .

  According to this, when the fin clogging of one heat exchanger occurs, the air flow passing through the other heat exchanger acting on the combustion gas in one combustion chamber corresponding to the one heat exchanger or The suction force due to the exhaust flow works strongly in the portion where the blocking portion 8d is not provided. Therefore, the drift of the combustion gas in one combustion chamber toward the partition wall 8 side is likely to occur toward the portion where the blocking portion 8d is not provided, as indicated by an arrow in FIG. As a result, the range where the blocking portion 8d of the partition wall 8 is not provided, that is, the range where the temperature sensing portion 10a of the temperature sensor 10 is located is strongly heated, and the arrangement range of the temperature sensing portion 10a is widened. Even if not, the detection accuracy of fin clogging can be ensured, and the cost of the temperature sensor 10 can be reduced.

  Moreover, since the range of the partition wall 8 in which the temperature sensing part 10a is located is strongly heated as described above, it is not necessary to position the temperature sensing part 10a in the center in the front-rear direction of the partition wall 8. Therefore, in the present embodiment, the temperature sensing unit 10a is positioned on the front side in the insertion direction of the temperature sensor 10 relative to the front-rear direction center of the partition wall 8, that is, on the front side. According to this, the temperature sensor 10 can be shortened, and the cost can be further reduced.

  In this embodiment, the predetermined range in the front-rear direction in which the blocking portion 8d is not provided is the front half of the partition wall 8. You may provide the obstruction | occlusion part 8d in the part of the partition wall 8 of back and front.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the temperature sensor 10 is inserted from the front of the can 1 into the hollow portion 8 c provided in the upper front half of the partition wall 8, but the hollow portion is provided in the upper rear half of the partition wall 8. It is also possible to insert the temperature sensor 10 into the hollow portion from the rear of the can 1. In this case, it is desirable to position the temperature sensing part 10a behind the center of the partition wall 8 in the insertion direction of the temperature sensor 10 with respect to the front-rear direction center.

Further, the above-described embodiment, the first burner 2 ₁ and the first heat exchanger 3 ₁ for hot water, the second burner 2 ₂ and 1 can type composite heat source machine and the second heat exchanger 3 ₂ and a bath While the invention is obtained by applying the second burner 2 ₂ and the second heat exchanger 3 ₂ other than bath applications, for example, and for heating, and further, the first burner 2 ₁ and the first heat exchanger 3 ₁ Similarly, the present invention can be applied to a single can type combined heat source machine that is used for purposes other than hot water supply.

DESCRIPTION OF SYMBOLS 1 ... Can body, 2 ₁ ... 1st burner, 2 ₂ ... 2nd burner, 3 ₁ ... 1st heat exchanger, 3 ₂ ... 2nd heat exchanger, 4 ... Distribution board, 4a ... Distribution hole, 5 ... Supply Air chamber, 6 ... combustion fan, 7 ₁ ... first combustion chamber, 7 ₂ ... second combustion chamber, 8 ... partition wall, 8c ... hollow part, 8d ... closed part, 10 ... temperature sensor, 10a ... temperature sensing part.

Claims (2)

A single can body, a first and second pair of burners provided side by side in the can body, and a first and second pair of heat exchangers provided side by side on the top of the can body And a first combustion chamber and a second burner extending from the first burner to the first heat exchanger in a space between the first and second burners and the first and second heat exchangers in the can. And a second combustion chamber extending from the first heat exchanger to the second heat exchanger, and defining a supply chamber partitioned by a distribution plate at the lower part of the can body, and combustion from a single combustion fan A can-type combined heat source machine configured to supply air to the first and second combustion chambers through distribution holes formed in the distribution plate from the supply chamber;
A rod-shaped temperature sensor having at least a part of a partition wall portion facing both the first and second combustion chambers formed hollow and having a temperature sensing portion at the tip from the front or rear of the can body in the hollow portion. In what is inserted,
The partition wall is provided with a closing portion that closes the gap between the first and second heat exchangers, and is closed in a predetermined front-rear direction range of the partition wall including a portion where the temperature sensing portion of the temperature sensor is located. Without providing a portion, both the first and second combustion chambers communicate with the gap between the first and second heat exchangers ,
The closed portion is formed into a cylindrical cross section that contacts the lower end of the side edge of the fin of each heat exchanger and closes the gap between the heat exchangers from below . 2. The single can type combined heat source apparatus according to claim 1, wherein the temperature sensing part of the temperature sensor is located closer to the front side of the partition wall in the insertion direction of the temperature sensor than the center in the front-rear direction.

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