JP6139383B2 - 1 can type combined heat source machine - Google Patents

Description

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

  Conventionally, in this type of one-can type combined heat source machine, an air supply chamber defined in a state where the space inside the can is partitioned by a distribution plate at the lower part of the can, and both the first and second inside the can A partition wall that divides a space between the heat exchanger and the distribution plate into a first combustion chamber located below the first heat exchanger and a second combustion chamber located below the second heat exchanger; The first and second burners are arranged in the first and second combustion chambers, and the combustion air from a single combustion fan is distributed through the distribution holes formed in the distribution plate from the supply chamber. Both the first and second combustion chambers are supplied.

  Conventionally, the partition wall is configured to have a hollow structure having a gap between the two wall plates on the first combustion chamber side and the second combustion chamber side, and air from the air supply chamber is allowed to flow through the gap between the two wall plates. The partition wall is cooled and has a temperature-sensitive portion at the tip in the gap of the partition wall portion facing the portion above the first and second burners of the first and second combustion chambers. 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 in the gap of the partition wall as in the above conventional example, when the fin clogging of one heat exchanger occurs, the temperature detected by the temperature sensor rises and the fin clogging occurs. Can be detected.

  Further, in the above conventional example, a wind shielding member is installed in the partition wall, which is positioned below the temperature sensing portion, and prevents air flowing in the gap between both wall plates from hitting the temperature sensing portion. Yes. Thereby, it can prevent that the detection output of a temperature sensor becomes unstable under the influence of the air which hits a temperature sensing part, and it is supposed that the detection accuracy of fin clogging will improve. However, when the wind-shielding member is provided as in the above-described conventional example, there is a problem that the number of parts increases and the cost increases.

Japanese Patent No. 4850205

  In view of the above, the present invention is a one-can type combined heat source that can prevent air from hitting the temperature sensing part of the temperature sensor without providing a wind-shielding member and is low in cost and high in detection accuracy of fin clogging. The challenge is to provide a machine.

  In order to solve the above-described problems, the present invention provides a single can body, a first and second pair of heat exchangers arranged side by side in an upper portion of the can body, and a can body in a lower portion of the can body. The space between the first and second heat exchangers in the can and the distribution plate is defined below the first heat exchanger. A partition wall that is divided into a first combustion chamber located at the second combustion chamber and a second combustion chamber located below the second heat exchanger, a first burner disposed in the first combustion chamber, and a second wall disposed in the second combustion chamber. A single can type composite comprising two burners and supplying 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. In the heat source apparatus, the partition wall is composed of two wall plates on the first combustion chamber side and the second combustion chamber side, and a first gap portion in which both wall plates are separated is provided at the lower part of the partition wall. The air is supplied from the air supply chamber to the first gap, and is above the first gap and above the first and second burners of the first and second combustion chambers. In the part of the partition wall facing the part, both wall plates are separated from each other, and a longitudinal sensor insertion gap is provided in the front-rear direction in which a rod-shaped temperature sensor having a temperature-sensitive part is inserted at the tip. The part of the partition wall located below the sensor insertion gap in the predetermined front-rear direction range including the part where the temperature sensing part is located is provided with a close contact part in which both wall plates are in close contact, and forward of the close contact part And a partition wall located at the rear is provided with a second gap portion that separates both wall plates and communicates with the first gap portion, and the air that has passed through the first gap portion passes through the second gap portion. It flows upward from the upper end of the partition wall, and further adheres in the predetermined front-rear direction range The portion of each wall plate adjacent to the lower end, characterized in that the vent is formed a part of the air passing through the first gap portion exits.

  According to the present invention, since the close contact portion is provided below the sensor insertion gap portion in the predetermined front and rear direction range including the portion where the temperature sensing portion of the temperature sensor is located, the sensor insertion gap in which the temperature sensing portion of the temperature sensor is located Air does not flow into the part from below. Therefore, it is possible to prevent air from hitting the temperature sensing part of the temperature sensor from below, to prevent the detection output of the temperature sensor from becoming unstable, and to eliminate the need for a wind shielding member, thereby reducing costs. it can.

  In addition, the part of the partition wall located in front of and behind the contact portion is cooled by the air flowing through the second gap, and further, the air blown out from the vent hole is in a predetermined front-rear direction range of the contact portion and the sensor insertion gap. Since the air flows along the outer surface of the portion, the air cools the portion in the predetermined front-rear direction range of the close contact portion and the sensor insertion gap, and ensures the heat resistance of the partition wall. When the fins of one of the heat exchangers are clogged, the internal pressure of the corresponding one of the combustion chambers rises, making it difficult for air to blow out from the vent holes. For this reason, the cooling of the part in the predetermined front-rear direction range of the close contact portion and the sensor insertion gap is suppressed, and coupled with the fact that the combustion gas in one combustion chamber is biased toward the partition wall, The portion in the predetermined front-rear direction range is efficiently heated, and the difference in temperature detected by the temperature sensor between the normal time and the fin clogging becomes large, and the fin clogging detection accuracy is improved.

  In the present invention, it is desirable to provide a close contact portion also on the partition wall located above the sensor insertion gap in the predetermined front-rear direction range. According to this, it is possible to prevent a part of the air flowing in the second gap portion from entering the portion of the sensor insertion gap portion in the predetermined front-rear direction range from above, and the detection output of the temperature sensor becomes more unstable. It can be surely prevented.

  In the present invention, each wall plate is formed with a shoulder portion that is bent inward in the lateral direction at the upper end of the first gap portion, and the close contact portion is provided so that the lower end thereof reaches the shoulder portion. It is desirable that a vent hole be formed in. According to this, air blows upward from the vent hole, and it becomes easy for air to flow along the outer surface of the portion in the predetermined front-rear direction range of the close contact portion and the sensor insertion gap portion. It is possible to improve the cooling performance of the portion of the predetermined range in the front-back direction.

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 perspective view of the partition wall provided in the 1 can type compound heat source machine of embodiment.

FIG. 1 shows a single can type combined heat source machine having a hot water supply function and a bath reheating function. The composite heat source apparatus is provided with a second heat exchanger 3 ₂ for the first heat exchanger 3 ₁ the bath hot water supply provided side by side in the lateral direction on top of a single can body 1, the first and and a second burner 2 ₂ for the first burner 2 ₁ and bath hot water supply provided in the can body 1 to heat the second of each heat exchanger 3 _1, 3 _2.

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. In addition, a space between the first and second heat exchangers 3 ₁ , 3 ₂ and the distribution plate 4 in the can ₁ is a first combustion chamber 7 located below the first heat exchanger 31. ₁ and provided with a partition wall 8 partitioning the second combustion chamber 7 ₂ located on the second lower heat exchanger 3 _2, with placing the first burner 2 ₁ into the first combustion chamber 7 _1, second and a second burner _{2 2} disposed in the combustion chamber _{7 2.} The air from the combustion fan 6 is supplied as combustion secondary air to the first and second combustion chambers 7 ₁ and 7 ₂ through a number of distribution holes 4 a formed in the distribution plate 4 from the supply chamber 5. To be.

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 Part through the second combustion chamber 7 ₂ 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, It is discharged to the outside through an exhaust port 9 a formed in the exhaust hood 9.

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 body 1 in the horizontal direction. 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.

Figure 3 also refer, 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. And the 1st space | gap part 8b which spaced apart both wall plates 8a and 8a is provided in the lower part of the partition wall 8, and the air supply chamber 5 is connected to the 1st space | gap part 8b through the communicating hole 4b formed in the distribution plate 4. FIG. The air from is supplied. Moreover, the partition wall facing the part above the _first and second burners 2 ₁ and 2 ₂ above the first gap 8b and above the first and second burners 2 ₁ and 2 ₂ of the first and _second combustion chambers 7 ₁ and 7 ₂ . In FIG. 8, both wall plates 8 a and 8 a are separated from each other, and a longitudinal sensor insertion gap 8 c is provided in the front-rear direction in which the temperature sensor 10 is inserted.

  The sensor insertion gap 8c has a circular cross section and is provided so as to reach the center in the front-rear direction from the front end of the partition wall 8. Further, the temperature sensor 10 has a temperature sensing part 10a that incorporates a temperature sensing element 10a 'such as a thermistor at the tip of a hollow rod-shaped sensor body. As shown in FIG. 1, the temperature sensor 10 is inserted into the sensor insertion space 8 c from the front of the can 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 1.

  Further, the both wall plates 8a and 8a are brought into close contact with the part of the partition wall 8 located below and above the sensor insertion gap 8c in a predetermined front and rear direction range including the part where the temperature sensing part 10a of the temperature sensor 10 is located. And a second gap portion 8e communicating with the first gap portion 8b by separating the two wall plates 8a and 8a from the partition wall 8 located forward and rearward of the close-contact portion 8d. The air that has passed through the first gap 8b flows upward from the upper end of the partition wall 8 through the second gap 8e. Furthermore, a vent hole 8f through which a part of the air that has passed through the first gap 8b escapes is formed in each wall plate 8a adjacent to the lower end of the contact portion 8d in the predetermined front-rear direction range.

  The sensor insertion gap 8c is formed with a diameter larger than that of the temperature sensor 10, and the temperature sensor 10 obstructs a portion of the sensor insertion gap 8c that intersects the second gap 8e in front of the contact portion 8d. Air flows from below to above without any problems. Further, a reduced diameter portion 8c ′ having the same diameter as that of the temperature sensor 10 is formed in a portion of the sensor insertion gap portion 8c that intersects the front edge portion of the close contact portion 8d, and the second gap portion 8e in front of the close contact portion 8d The reduced diameter portion 8c ′ can prevent air from flowing into the sensor insertion gap 8c at the rear. Further, a contact portion 8d is provided so as to connect the upper and lower contact portions 8d of the sensor insertion space 8c behind the rear end of the sensor insertion space 8c, and the sensor is inserted from the second space 8e behind the contact portion 8d. Air can be prevented from flowing into the gap 8c.

  In the present embodiment, each wall plate 8a is formed with a shoulder portion 8g bent inward in the lateral direction at the upper end of the first gap portion 8b, and the close contact portion 8d is provided so that the lower end thereof reaches the shoulder portion 8g. The vent 8f is opened in the shoulder 8g. Note that the second gap 8e is narrower than the first gap 8b because of the formation of the shoulder 8g.

  According to this embodiment, the part of the partition wall 8 located in front and rear of the contact portion 8d is cooled by the air flowing through the second gap portion 8e, and the air blown out from the vent hole 8f is further cooled by the contact portion 8d and the sensor. Since the air flows along the outer surface of the portion in the predetermined front-rear direction range of the insertion gap 8c, the air cools the portion in the predetermined front-rear direction of the contact portion 8d and the sensor insertion gap 8c. Is secured.

However, 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, in the present embodiment, the signal of the temperature sensor 10 is input to the controller 11 and the temperature detected by the temperature sensor 10 during single combustion of only one of the _first and second burners 2 ₁ and 2 ₂ is detected. Is equal to or greater than a predetermined threshold value, it is determined that one of the heat exchangers corresponding to one of the burning burners has clogged fins, and combustion of one of the burners is prohibited.

  By the way, if the sensor insertion gap portion 8c is continuous with the first gap portion 8b and air from the first gap portion 8b flows into the sensor insertion gap portion 8c, air flows from below into the temperature sensing portion 10a of the temperature sensor 10. In this case, the detection output of the temperature sensor 10 becomes unstable. In this case, if the wind-shielding member is installed on the lower side of the temperature sensing unit 10a, it is possible to prevent the temperature sensing unit 10a from being exposed to air from below, but this increases the number of parts and increases the cost. .

  On the other hand, in the present embodiment, the close contact portion 8d is provided below the sensor insertion gap portion 8c in a predetermined front-rear direction range including the portion where the temperature sensitive portion 10a of the temperature sensor 10 is located. Air does not flow from the first gap 8b into the sensor insertion gap 8c where the warm portion 10a is located. Accordingly, it is possible to prevent the detection output of the temperature sensor 10 from becoming unstable due to air hitting the temperature sensing part 10a of the temperature sensor 10 from the lower side, and it is not necessary to provide a wind-shielding member, and the cost can be reduced. .

  It is also possible to provide the contact portion 8d only below the sensor insertion gap portion 8c in the predetermined front-rear direction range. However, if the contact portion 8d is also provided above the sensor insertion gap portion 8c in the predetermined front-rear direction range as in the present embodiment, a part of the air flowing through the second gap portion 8e is part of the sensor insertion gap portion 8c. It is also possible to prevent the portion in the front-rear direction range from being turned from above, and it is possible to more reliably prevent the detection output of the temperature sensor 10 from becoming unstable.

  Further, in the present embodiment, air is prevented from flowing from the second gap portion 8e before and after the contact portion 8d into the predetermined front-rear direction range portion of the sensor insertion gap portion 8c. The portion may be communicated with the second gap portion 8e before and after the close contact portion 8d so that air flows from the second gap portion 8e into the corresponding portion of the sensor insertion gap portion 8c. Even in this case, if the portion in the predetermined front-rear direction range of the sensor insertion gap portion 8c is filled with air from the second gap portion 8e, no further air flows into the portion of the sensor insertion gap portion 8c, and the temperature sensor The detection output of 10 does not become unstable.

  Further, when one of the heat exchangers is clogged with fins, the internal pressure of one of the corresponding combustion chambers rises, making it difficult for air to blow out from the vent hole 8f formed in the wall plate 8a on the one combustion chamber side. Therefore, the cooling of the portions in the predetermined front-rear direction range of the contact portion 8d and the sensor insertion gap portion 8c is suppressed, and the sensor insertion gap is coupled with the fact that the combustion gas in one combustion chamber is biased to flow toward the partition wall. A portion of the portion 8c in the predetermined front-rear direction range is efficiently heated. As a result, the difference in temperature detected by the temperature sensor 10 between the normal time and the fin clogging becomes large, and the fin clogging detection accuracy is improved.

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-described embodiment, the shoulder 8g is formed at a position equivalent to the upper end of each of the first and second burners 2 ₁ and 2 ₂ , but if it is lower than the sensor insertion gap 8c, You may form the shoulder part 8g in the upper position from the upper end of each burner 2 ₁ and 2 ₂ . Further, the vent 8f may be formed in the shoulder 8g not only in the front-rear direction range in which the close contact portion 8d is provided, but also in the front and rear ranges of the close contact portion 8d. However, since part of the air blown out from the vent hole 8f diffuses into the combustion chamber, in order to improve the cooling performance of the part of the partition wall 8 at the front and rear of the close contact portion 8d, the front of the close contact portion 8d is improved. It is advantageous to increase the flow rate of air flowing through the second gap 8e without forming the vent hole 8f in the rear range.

  Further, the lower end of the contact portion 8d is positioned above the shoulder portion 8g, and a vent hole is formed so as to open in the lateral direction in the portion of the wall plate 8a between the shoulder portion 8g and the lower end of the contact portion 8d. Is also possible. However, if the vent hole 8f is formed in the shoulder portion 8g as in the above embodiment, air is blown upward from the vent hole 8f, and on the outer surface of the contact portion 8d and the sensor insertion gap portion 8c in the predetermined front-rear direction range. Air is easy to flow along, which is advantageous in improving the cooling performance of the contact portion 8d and the sensor insertion gap 8c in the normal range in the predetermined front-rear direction. Moreover, in the said embodiment, the upper end of the contact | adherence part 8d is located below the upper end of the partition wall 8, and the 2nd space | gap part before and behind the contact part 8d is located in the part of the partition wall 8 above the upper end of the contact part 8d. Although the gap portion connecting 8e is provided, the close contact portion 8d may be provided so as to reach the upper end of the partition wall 8.

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, 8a ... wall plate, 8b ... first gap, 8c ... sensor insertion gap, 8d ... Close contact portion, 8e ... second gap portion, 8f ... vent hole, 8g ... shoulder portion, 10 ... temperature sensor, 10a ... temperature sensitive portion.

Claims (3)

A single can body, a first and a second pair of heat exchangers arranged side by side on the top of the can body, and a space at the bottom of the can body partitioned by a distribution plate. The first combustion chamber located below the first heat exchanger and the second heat exchange between the air supply chamber formed and the space between the first and second heat exchangers and the distribution plate in the can body A partition wall partitioned into a second combustion chamber located below the vessel, a first burner disposed in the first combustion chamber, and a second burner disposed in the second combustion chamber, and comprising a single combustion fan A can-type combined heat source machine that supplies the combustion air from the air supply chamber to the first and second combustion chambers through distribution holes formed in the distribution plate,
The partition wall is composed of two wall plates on the first combustion chamber side and the second combustion chamber side, and a first gap portion in which the both wall plates are separated is provided at a lower portion of the partition wall, and the first gap portion is provided. So that air is supplied from the air supply chamber,
The both wall plates are spaced apart from the partition wall facing the portion above each of the first and second burners above the first gap and above the first and second burners, A sensor insertion gap portion in a predetermined front-rear direction range including a portion where the temperature sensing portion of the temperature sensor is located and a longitudinal sensor insertion gap portion is provided in the front-rear direction in which a rod-shaped temperature sensor having a temperature sensing portion is inserted. The part of the partition wall located below is provided with a close contact portion in which both wall plates are in close contact, and the both wall plates are separated from the partition wall portions located in front and behind the close contact portion, A second gap portion that communicates with the first gap portion is provided so that air that has passed through the first gap portion flows upward from the upper end of the partition wall via the second gap portion;
Further, a single-can type characterized in that a vent hole through which a part of the air that has passed through the first gap portion escapes is formed in each wall plate portion adjacent to the lower end of the contact portion in the predetermined longitudinal direction range. Combined heat source machine.   2. The single can type combined heat source apparatus according to claim 1, wherein the contact portion is also provided in a partition wall portion located above the sensor insertion gap in the predetermined front-rear direction range.   Each wall plate is formed with a shoulder portion bent inward in the lateral direction at an upper end of the first gap portion, and the close contact portion is provided so that a lower end thereof reaches the shoulder portion, and the vent hole is formed in the shoulder portion. The single can type combined heat source machine according to claim 1 or 2, wherein

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