JP5330285B2 - 1 can type combined heat source machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect clogging of a fin in a heat exchanger on one side, in one can type complex heat source machine having: a pair of burners 2<SB>1</SB>, 2<SB>2</SB>disposed in parallel with each other in a single can body; a pair of heat exchangers 3<SB>1</SB>, 3<SB>2</SB>disposed in parallel with each other in an upper section of the can body; and a partitioning wall 8 for dividing the inside of the can body into two combustion chambers 7<SB>1</SB>, 7<SB>2</SB>, and cooling the partitioning wall by the air from an air supply chamber 5. <P>SOLUTION: At least a part of an area of the partitioning wall 8 facing both combustion chambers 7<SB>1</SB>, 7<SB>2</SB>is made hollow, and a temperature sensor 10 is disposed in the hollow section. When the fin of one of the heat exchangers is clogged, a combustion gas in one of the combustion chambers corresponding to the heat exchanger flows in a state of deflecting to a partitioning wall side, and a detection temperature of the temperature sensor 10 rises. In a single combustion for burning only one of burners, the presence or absence of fin clogging of one of the heat exchangers corresponding to one of the burners is discriminated on the basis of the detection temperature of the temperature sensor 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

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.

  Here, when the partition wall is provided in the can as described above, the partition wall is heated to a very high temperature by the combustion heat of each of the first and second burners, so ensuring the heat resistance of the partition wall is a problem. Become. Therefore, the partition wall is configured as a hollow structure having two wall plates on the first combustion chamber side and the second combustion chamber side so that the air from the air supply chamber flows in the gap between both wall plates. Is also known (see, for example, Patent Document 1). According to this, the partition wall is air-cooled by the air from the air supply chamber, and the heat resistance of the partition wall is ensured.

  By the way, if the heat source device is operated to some extent, soot and scale may accumulate on the fins of the heat exchanger, which may cause clogging of the fins and blockage of the exhaust passage connected to the heat exchanger. If the degree of blockage of the heat exchanger or exhaust passage increases, the amount of air flowing into the combustion chamber (air flow) decreases, the work of the combustion fan decreases, and the fan current flowing through the fan motor that drives the combustion fan decreases. . Therefore, conventionally, in a single-use heat source machine for hot water supply or the like, the degree of blockage of the heat exchanger and the exhaust passage connected to the heat exchanger is detected based on the correlation between the rotational speed of the combustion fan and the fan current. Is known (see, for example, Patent Document 2). Combustion improvement control is performed to increase the rotational speed of the combustion fan or decrease the burner combustion amount as the degree of blockage increases, and when the blockage level exceeds a predetermined value, combustion of the burner is stopped. ing.

  Even in a single can type combined heat source machine, it is conceivable to detect clogging of the heat exchanger based on the correlation between the rotational speed of the combustion fan and the fan current. However, when fin clogging occurs in one heat exchanger of the first heat exchanger and the second heat exchanger, for example, the first heat exchanger, the amount of air flow to the first combustion chamber is reduced, The amount of blown air to the second combustion chamber increases, and the total amount of blown air does not decrease so much. Therefore, it is difficult to detect fin clogging of one heat exchanger based on the correlation between the rotational speed of the combustion fan and the fan current.

JP 2006-78162 A Japanese Patent No. 3029547

  This invention makes it the subject to provide the 1 can type | mold composite heat source device which enabled it to detect this when the fin clogging of one heat exchanger produced in view of the above point.

  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. A first combustion chamber extending from the first burner to the first heat exchanger in a space between the first heat exchanger and the first and second burners in the can and the first and second heat exchangers. And a partition wall that divides into a second combustion chamber from the second burner to the second heat exchanger, and an air supply chamber partitioned by a distribution plate is defined at the lower part of the can body. A one-can type combined heat source machine that supplies combustion air from a fan to both the first and second combustion chambers through distribution holes formed in the distribution plate from the supply chamber. In order to solve the above-described problems, the present invention is characterized in that it is air-cooled by air from the air chamber.

  That is, according to the present invention, at least a part of the partition wall portion facing both the first and second combustion chambers is formed hollow, a temperature sensor is disposed in the hollow portion, and the single combustion of only the first burner is performed. Sometimes, when the temperature detected by the temperature sensor is equal to or higher than a predetermined first judgment temperature, the first judgment means for judging that the fins of the first heat exchanger are clogged, and the temperature sensor at the time of single combustion of only the second burner And a second discriminating means for discriminating that the clogging of the fins of the second heat exchanger has occurred when the detected temperature becomes equal to or higher than a predetermined second judgment temperature.

  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 side. If the temperature sensor is arranged in the hollow portion of the partition wall as in the present invention, the detected temperature of the temperature sensor rises when fins of one heat exchanger are clogged. That is, when fin clogging occurs in the first heat exchanger, the temperature detected by the temperature sensor is equal to or higher than a predetermined first determination temperature, and when fin clogging occurs in the second heat exchanger, the temperature sensor The detected temperature becomes equal to or higher than a predetermined second determination temperature. During simultaneous combustion of both the first and second burners, even if the temperature detected by the temperature sensor rises, which heat exchanger of the first heat exchanger or the second heat exchanger has clogged fins Although it is impossible to discriminate, in the present invention, the fin clogging of the first heat exchanger is determined based on the temperature detected by the temperature sensor when the first burner alone is burned, and the temperature sensor detected temperature is detected when the second burner is burned alone. Therefore, it is possible to reliably determine which heat exchanger has clogged fins.

  Further, in the present invention, when it is determined that either one of the first determination means and the second determination means has caused the clogging of the fins, the combustion of the burning burner among the first and second burners is stopped. Therefore, it is desirable to prohibit subsequent combustion of the burner. According to this, it is possible to prevent the occurrence of defective combustion due to combustion of one burner corresponding to one heat exchanger that has clogged fins, and it is safe.

  By the way, the first determination temperature and the second determination temperature may be set to different temperatures due to the size difference between the first burner and the second burner. Here, the higher one of the first determination temperature and the second determination temperature is the high temperature determination temperature, the lower one is the low temperature determination temperature, and the determination based on the high temperature determination temperature is between the first determination means and the second determination means. If one that performs the determination based on the low temperature determination temperature and the one that performs the determination based on the low temperature determination temperature are the low temperature determination means, one of the first burner and the second burner that performs the determination by the high temperature determination means, When shifting from the simultaneous combustion of both the second burners to the single combustion of the other burner that is determined by the low temperature determination means, the temperature detected by the temperature sensor may be equal to or higher than the low temperature determination temperature. In this case, even if the heat exchanger corresponding to the other burner is not clogged with fins, it is erroneously determined that the heat exchanger has clogged with the low temperature discrimination means at the start of the single combustion of the other burner. The combustion of the other burner is stopped. In addition, when the temperature of the temperature sensor is equal to or higher than the high temperature determination temperature when shifting from the simultaneous combustion of both the first and second burners to the single combustion of one burner that is determined by the high temperature determination means. Even if the heat exchanger corresponding to one of the burners is not clogged with fins, it is erroneously determined that the heat exchanger has clogged with the high temperature discrimination means at the start of single combustion of one of the burners, and one of the burners Will stop burning.

  Therefore, when the simultaneous combustion of both the first and second burners is stopped or when the single burner of one of the first and second burners is discriminated by the high temperature discriminating means, the temperature detected by the temperature sensor is judged to be low. If the temperature is equal to or higher than the temperature, discrimination by the low temperature discrimination means is prohibited until a predetermined time has elapsed from the time when combustion is stopped, and when the simultaneous combustion of both the first and second burners is stopped, the temperature detected by the temperature sensor is higher than the high temperature judgment temperature. In some cases, it is desirable to prohibit discrimination by the high temperature discrimination means until a predetermined time elapses from the point of time when combustion is stopped. According to this, when the fin clogging of the first heat exchanger or the second heat exchanger has not occurred, the temperature detected by the temperature sensor is lowered during the discrimination prohibition time, and the erroneous discrimination can be prevented.

  In addition, when the power is turned off due to a power failure or the like, the combustion fan is stopped, so even if combustion of the burner is stopped, the partition wall is heated by the residual heat, and the temperature detected by the temperature sensor rises to be above the low temperature determination temperature. May end up. In this case, when the power source is turned on again and the other burner to be discriminated by the low temperature discriminating means is burned, there is a possibility that the low temperature discriminating means erroneously discriminates that the heat exchanger has clogged fins.

  Therefore, after the power is turned off, if the temperature sensor detected temperature at the time when the power is turned on again is equal to or higher than the low temperature judgment temperature, discrimination by the low temperature judgment means is prohibited until a predetermined time has elapsed since the power was turned on again. Is desirable. According to this, it is possible to prevent erroneous determination that the heat exchanger fins are clogged by the low temperature determination means. Even when the other burner is not burned, since the time for which discrimination is prohibited is counted from the time when the power is turned on again, the time from the start of combustion of the other burner to the start of discrimination by the low temperature discriminating means is shortened. It is.

  Further, during the single combustion of only the first burner, even when the temperature detected by the temperature sensor is lower than the first determination temperature, when the temperature becomes equal to or higher than a predetermined first preliminary determination temperature set lower than the first determination temperature, Combustion improvement control for increasing the rotational speed of the combustion fan or reducing the combustion amount of the first burner is performed, and even when the temperature detected by the temperature sensor is less than the second determination temperature during the single combustion of only the second burner When the temperature becomes equal to or higher than a predetermined second preliminary determination temperature set lower than the second determination temperature, combustion improvement control for correcting the increase in the rotation speed of the combustion fan or correcting the decrease in the combustion amount of the second burner may be performed. desirable. According to this, even if a slight fin clogging of the first heat exchanger or the second heat exchanger occurs, the temperature of the combustion chamber can be suppressed by improving the combustion state, and the life of the heat source machine can be extended. .

  Further, at the time of simultaneous combustion of both the first and second burners, the partition wall is heated by both the first and second burners, so that fin clogging of the first and second heat exchangers does not occur. The detected temperature of the temperature sensor may be higher than both the first and second determination temperatures, and if the simultaneous combustion is continued as it is, the life of the heat source machine is adversely affected. In this case, when the detected temperature of the temperature sensor becomes equal to or higher than a predetermined third determination temperature set higher than both the first and second determination temperatures during simultaneous combustion of the first and second burners, the first It is also conceivable to stop the combustion of both the second burner. However, in this case, the heat source machine suddenly becomes unusable and inconveniences the user.

  Therefore, when the detected temperature of the temperature sensor becomes equal to or higher than the third determination temperature at the time of simultaneous combustion of both the first and second burners, one of the first burner and the second burner is burned independently, It is desirable to burn the other burner alone after the burning of the other burner is stopped. According to this, combustion of the 1st burner or the 2nd burner alone becomes possible, and it can avoid that a heat source machine becomes suddenly unusable and inconveniences a user.

  By the way, when the fins of both the first and second heat exchangers are clogged, the combustion gas of each of the first and second burners does not flow to the partition wall side, and the temperature detected by the temperature sensor rises so much. Disappear. Therefore, it becomes impossible to determine fin clogging based on the temperature detected by the temperature sensor. In this case, based on the relative relationship between the rotational speed of the combustion fan and the fan current flowing through the fan motor that drives the combustion fan, the degree of blockage of the first and second heat exchangers and the exhaust passage connected to both heat exchangers is determined. When the degree of blockage detected by the blockage detection means is equal to or greater than a predetermined first determination value during the single combustion of any one of the first burner and the second burner, If the second heat exchangers are provided with third discriminating means for discriminating that the fins are clogged, it is advantageous that both heat exchangers can be detected when the fins are clogged together.

  Here, when it is determined by the third determining means that the clogging of the one burner has occurred during the single combustion of the one burner, it is considered that the combustion of the one burner is stopped and the subsequent combustion of the one burner is prohibited. It is done. However, the degree of blockage detected by the blockage detection means may increase temporarily due to wind blown into the exhaust passage or blockage of the exhaust port due to a curing sheet, etc. Prohibiting subsequent burner burns will cause more inconvenience to the user.

  For this reason, when it is determined by the third determining means that the clogging of the one burner has occurred during the single combustion of the one burner, the combustion of the one burner is stopped, and then the combustion start command for the first burner or the second burner is issued. In this case, the blockage detection means detects the blockage degree over a predetermined time with only the combustion fan being operated before ignition. When the detected blockage degree is less than the first determination value, the blockage degree is set to this blockage degree. Accordingly, it is desirable to ignite the first burner or the second burner by correcting the rotational speed of the combustion fan. According to this, even if combustion of one burner is stopped due to a temporary increase in the degree of blockage, the burner can be burned again as long as the degree of blockage detected before ignition is less than the first determination value thereafter. It is possible to avoid inconvenience more than necessary for the user.

  In addition, when the first and second burners are simultaneously burned, when the degree of blockage detected by the blockage detection unit is equal to or higher than a predetermined second determination value set lower than the first determination value, It is desirable that one burner of the second burner is burned alone and the other burner is burned alone after the burning of the one burner is stopped. According to this, combustion of the 1st burner or the 2nd burner alone becomes possible, and it can avoid that a heat source machine becomes suddenly unusable and inconveniences a user.

  By the way, a combustion command for the first burner or the second burner is issued after the combustion of the first and second burners is normally stopped without being determined as fin clogging by the first, second and third determining means. In this case, the above-described detection of the degree of closing before ignition may be performed every time, but this takes time until the burner is ignited. Therefore, the degree of blockage stored in the non-volatile memory is rewritten to the degree of blockage detected when the combustion of each of the first and second burners is normally stopped so as not to disappear even when the power is turned off. It is conceivable to perform ignition control of the first burner or the second burner by correcting the rotational speed of the combustion fan in accordance with the degree of blockage stored in the volatile memory. However, in this case, the rewrite frequency of the blockage degree is extremely increased, and the durability of the nonvolatile memory is adversely affected.

  For this reason, only when the degree of blockage detected by the blockage detection means when the combustion of the first and second burners is normally stopped has changed by a predetermined amount or more from the degree of blockage stored in the nonvolatile memory. The blockage degree stored in the non-volatile memory when the blockage degree stored in the non-volatile memory is rewritten to the blockage degree detected this time, and then the combustion start command for the first burner or the second burner is issued. It is desirable to perform ignition control of the first burner or the second burner based on the above. According to this, the time taken from when the burner combustion start command is issued until the burner is ignited is shortened, and the rewrite frequency of the blockage degree is reduced, which adversely affects the durability of the nonvolatile memory. Can be prevented.

  In an embodiment described later, STEP 6 in FIG. 5 corresponds to the first determination unit, and STEP 14 in FIG. 5 corresponds to the second determination unit, which corresponds to the third determination unit. These are STEPs 3 and 11 in FIG.

The cutting front view showing the 1 can type compound heat source machine of a 1st embodiment of the present invention. FIG. 2 is a cut side view taken along line II-II in FIG. 1. The graph which shows the correlation with a fan rotation speed and a fan electric current. The graph which shows the correlation with a correction coefficient and the obstruction | occlusion degree. The flowchart which shows the content of the operation control performed with the 1 can type | mold composite heat source machine of embodiment. The flowchart which shows the content of the ignition control performed with the 1 can type | mold composite heat source machine of embodiment. The flowchart which shows the content of the discrimination | determination prohibition control performed with the 1 can type compound heat source machine of embodiment. The cutting front view which shows the 1 can type | mold composite heat source machine of 2nd Embodiment. The flowchart which shows the content of the discrimination | determination prohibition control performed with the 1 can type compound heat source machine of 2nd Embodiment.

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 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.

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, It is discharged to the outside through an exhaust port 9 a formed in the exhaust hood 9.

Partition wall 8 has a first combustion chamber ₇₁ side and the second combustion chamber 7 ₂ side of the two wall panels 8a, is composed of 8a, both wallboard 8a over the upper end from the lower end, the gap between the 8a It is formed in a hollow structure. The lateral width of the gap between the wall plates 8a, 8a is widened at the lower part of the partition wall 8, and the gap is communicated with the air supply chamber 5 through the communication hole 4b formed in the distribution plate 4. Further, a vent hole (not shown) is formed in the middle shoulder portion of each wall plate 8a in the vertical direction. According to this, the air from the air supply chamber 5 flows into the space between the wall plates 8a, 8a, and the air ejected from the vent holes 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, in the present embodiment, the temperature sensor 10 is disposed in the upper hollow portion (the space between both wall plates 8a and 8a) of the partition wall 8 facing both the first and second heat exchangers 3 ₁ and 3 _2. and, based on this temperature detected by the temperature sensor 10, and to detect the first heat exchanger 3 ₁ clogging fins of one heat exchanger and the second heat exchanger 3 _2.

  The temperature sensor 10 has a pipe-like shape having a temperature sensing portion 10a incorporating a temperature sensing element such as a thermistor at the tip. The temperature sensor 10 is connected to the partition wall 8 from the front side of the can 1 as shown in FIG. It is inserted in the hollow part. And the fixed part 10b of the tail end side of the temperature sensor 10 is being fixed to the front surface of the can 1 in the state which located the temperature sensitive part 10a in the center part of the partition wall 8 in the front-back direction.

Incidentally, both wallboard 8a of the temperature sensor 10 is a partition wall 8, when in contact with the 8a, when one alone causes only a burned burner combustion of the first burner 2 ₁ and the second burner 2 _2, the burner Even if the temperature of the wall plate 8a on one combustion chamber side becomes high due to clogging of the fins of one of the corresponding heat exchangers, the temperature sensor 10 from the wall plate 8a to the wall plate 8a on the other combustion chamber side passes through the temperature sensor 10. As a result, the detection temperature of the temperature sensor 10 is prevented from increasing, and the fin clogging detection accuracy deteriorates. Therefore, in the present embodiment, the both wall plates 8a and 8a are formed with the bulging portion 8b bulging outward in the lateral direction so as to be positioned at the insertion portion of the temperature sensor 10, and the temperature sensor 10 is formed on the both wall plates 8a. , 8a.

A detection signal of the temperature sensor 10 is input to a controller 11 that controls both the first and second burners 2 ₁ and 2 ₂ and the combustion fan 6. The controller 11 is burned as functional means, the occlusion degree of the exhaust passage (exhaust hood 9) the first and connected to a second of the two heat exchangers ₃ 1, _{3 2} and Ryonetsu exchanger ₃ 1, _{3 2} Blockage detection means for detecting based on the correlation between the rotational speed of the fan 6 and the fan current is provided.

Here, the fan rotation speed-fan current characteristic is normally as indicated by a line in FIG. 3, but when the degree of blockage increases, the amount of air flowing through the first and second combustion chambers 7 ₁ and 7 ₂ ( 3), the work amount of the combustion fan 6 is reduced, the fan current is reduced, and the line b in FIG. 3 is obtained. Then, the difference in fan current between the auxiliary value line and the normal line (a line) obtained by the experiment shown by the c line in FIG. 3 is ΔI1, the difference between the auxiliary value line and the actual fan current is ΔI2, and a constant of 1 or less. As α, a correction coefficient H of the fan rotational speed necessary for preventing air shortage is obtained by an equation H = {(ΔI1 / ΔI2) −1} × α + 1. 4 holds the correlation shown in FIG. Therefore, in the present embodiment, the correction coefficient H is detected (calculated) as a parameter representing the degree of blockage by the blockage detection means.

  Hereinafter, the contents of the operation control performed by the controller 11 will be described with reference to FIG. In FIG. 5, YT1 is set to a first determination temperature set to about 250 ° C., for example, YT1a is set to a first preliminary determination temperature set to about 200 ° C. lower than YT1, and YT2 is set to about 230 ° C. for example. The second determination temperature, YT2a is a second preliminary determination temperature set to about 180 ° C. lower than YT2, and YT3 is set to about 280 ° C. higher than both the first and second determination temperatures YT1 and YT2, for example. The third determination temperature, YT4 is higher than the third determination temperature YT3, for example, a fourth determination temperature set to 300 ° C., for example, and YH1 is, for example, a first determination value set to about 1.2 (80% in terms of blockage degree), YH2 is a second determination value that is set to about 1.18 (78% in terms of blockage) that is lower than the first determination value YH1.

The controller 11 first single hot water supply run to the operating state of the multifunction heat source device in STEP1 burning only the first burner 2 _1, bath alone operation and first to burn only the second burner 2 ₂ and the second of the two burners 2 It is determined whether the hot water supply for simultaneously burning ₁ and 2 ₂ or the bath is operated simultaneously.

During the single hot water supply operation (during independent combustion of the first burner _{2 1} only), the combustion improvement control by STEP2. Combustion improvement control, the combustion fan 6 is rotated at a rotational speed obtained by multiplying the correction coefficient H in the reference rotation speed corresponding to the first burner 2 _first combustion amount. As a result, the rotational speed of the combustion fan 6 is corrected to increase as the degree of blockage increases, and combustion failure due to air shortage is prevented.

Next, in STEP 3, it is determined whether or not the correction coefficient H is less than the first determination value YH1. If H <YH1, the process proceeds to STEP 4, and it is determined whether or not the detected temperature T of the temperature sensor 10 has become equal to or higher than the first preliminary determination temperature YT1a. When causing mild fin clogging of the first heat exchanger _{3 1,} the T ≧ YT1a. In this case, the process proceeds to STEP 5, in which combustion improvement control is performed to correct the rotational speed of the combustion fan 6 by a predetermined ratio (for example, 5%) higher than the value obtained by multiplying the reference rotational speed by the correction coefficient H, and the first heat exchange is performed. an error message is displayed for notifying the occurrence of the vessel 3 ₁ fin clogging. According to this, even if the supply air amount to the first combustion chamber 7 ₁ clogging mild fins of the first heat exchanger 3 ₁ becomes somewhat insufficient, to improve the combustion state in an increase correction of the fan speed In addition, the amount of cooling air flowing through the partition wall 8 is increased, the temperature of the partition wall 8 is lowered, and the life is extended.

Next, in STEP 6, it is determined whether or not the detected temperature T of the temperature sensor 10 has become equal to or higher than the first determination temperature YT1. Here, the first heat exchanger 3 ₁ fin clogging progresses, the detected temperature T of the temperature sensor 10 rises above the first judgment temperature YT1. Therefore, when it is T ≧ YT1 determines that resulted in clogging fins of the first heat exchanger 3 _1, the process proceeds to STEP9 After setting the first flag F to "1" advances to STEP7, while error display stop with an error to stop the combustion of the first burner 2 _1.

By the way, if the first and second heat exchangers 3 ₁ and 3 ₂ are clogged with fins, the combustion gases of the _first and second burners 2 ₁ and 2 ₂ are not biased toward the partition wall 8 side. The detected temperature T of the temperature sensor 10 does not rise so much. For this reason, it is impossible to determine fin clogging based on the temperature T detected by the temperature sensor 10. On the other hand, when the fins of both heat exchangers 3 ₁ and 3 ₂ are clogged, the correction coefficient H increases. Therefore, when it is determined in STEP 3 that H ≧ YH1, it is determined that the first and second heat exchangers 3 ₁ and 3 ₂ are clogged with fins, and the third flag F3 is set to “1” in STEP 8. After that, proceed to STEP 9 to stop the error.

Bath islanding when the (during independent combustion of the second burners 2 ₂ only), first, in STEP 10, the combustion fan at a rotational speed obtained by multiplying the correction coefficient H as a reference speed corresponding to the second combustion amount of burners 2 ₂ Combustion improvement control for rotating 6 is performed. Next, in STEP 11, it is determined whether or not the correction coefficient H is less than the first determination value YH1. If H <YH1, the process proceeds to STEP 12, and it is determined whether or not the detected temperature T of the temperature sensor 10 is equal to or higher than the second preliminary determination temperature YT2a. When causing mild fin clogging of the second heat exchanger _{3 2} becomes T ≧ YT2a. In this case, the process proceeds to STEP13, in which combustion improvement control is performed to correct the rotational speed of the combustion fan 6 by a predetermined ratio (for example, 3%) higher than the value obtained by multiplying the reference rotational speed by the correction coefficient H, and the second heat exchange is performed. an error message is displayed for notifying the occurrence of the vessel 3 _second fin clogging. According to this, even if the supply air amount to the second combustion chamber 7 ₂ in clogging mild fins of the second heat exchanger 3 ₂ becomes somewhat insufficient, to improve the combustion state in an increase correction of the fan speed In addition, the amount of cooling air flowing through the partition wall 8 is increased, the temperature of the partition wall 8 is lowered, and the life is extended.

Next, in STEP 14, it is determined whether or not the detected temperature T of the temperature sensor 10 has become equal to or higher than the second determination temperature YT2. Here, the second heat exchanger 3 ₂ fins clogging progresses, the detected temperature T of the temperature sensor 10 rises above the second judgment temperature YT2. Therefore, when it is T ≧ YT2 determines that resulted in the second heat exchanger _{3 2} fin clogging, the flow proceeds to STEP17 after setting the second flag F2 to "1" in STEP 15, the addition to error display 2 stop with an error to stop the combustion of the burner 2 _2. If it is determined in STEP 11 that H ≧ YH1, it is determined that the first and second heat exchangers 3 ₁ and 3 ₂ are clogged with fins, and in STEP 16, the third flag F3 is set to “1”. After that, proceed to STEP 17 to stop the error.

Incidentally, after increasing corrected fan speed in STEP5 or STEP 13, clogging the fins is eliminated by depositing soot and scale between the first heat exchanger 3 ₁ and the second heat exchanger 3 ₂ absorbing fin 3a falls off Sometimes. Therefore, after the increase in fan speed is corrected, a predetermined temperature at which the detected temperature T of the temperature sensor 10 is set lower than the first preliminary determination temperature YT1a and the second preliminary determination temperature YT2a (for example, 180 ° C. during hot water supply single operation, bath only When the temperature becomes 130 ° C. or lower during operation, the rotational speed of the combustion fan 6 may be returned to a value obtained by multiplying the reference rotational speed by the correction coefficient H.

During simultaneous operation of hot water supply and bath (when both the first and second burners 2 ₁ and 2 ₂ are simultaneously combusted), first, in STEP 18, the combustion fan 6 is rotated at a rotational speed obtained by multiplying the reference rotational speed by the correction coefficient H. To improve combustion. Next, in STEP 19, it is determined whether or not the correction coefficient H is less than the second determination value YH2. If H <YH2, the process proceeds to STEP 20, and it is determined whether or not the detected temperature T of the temperature sensor 10 is equal to or higher than the third determination temperature YT3. Here, at the time of simultaneous operation, the partition wall 8 is heated by both the first and second burners 2 ₁ and 2 ₂ , thereby causing fin clogging of the first and second heat exchangers 3 ₁ and 3 _2. Even if not, the detected temperature T of the temperature sensor 10 may be higher than both the first and second determination temperatures YT1 and YT2, and if the simultaneous operation is continued as it is, the life of the heat source machine is adversely affected. In this case, during simultaneous operation, if the detected temperature T of the temperature sensor 10 is equal to or higher than the third determination temperature YT3, it is conceivable to stop the combustion of both the first and second burners 2 ₁ and 2 ₂ . However, in this case, the heat source machine suddenly becomes unusable and inconveniences the user.

  Therefore, when the detected temperature T of the temperature sensor 10 is equal to or higher than the third determination temperature YT3, an error is displayed in STEP 21 and the operation is shifted from the simultaneous operation to the hot water supply single operation in STEP 22. When it is determined in STEP 23 that the hot water supply operation has been stopped, the process proceeds to STEP 24 to shift to a bath single operation. Therefore, it can be avoided that the heat source machine suddenly becomes unusable and inconveniences the user.

  Moreover, although the detection temperature T of the temperature sensor 10 falls by shifting to the hot water supply or the bath independent operation, the detection temperature T may continue to rise rarely. Therefore, in STEP 25, it is determined whether or not the detected temperature T of the temperature sensor 10 is equal to or higher than the fourth determination temperature YT4. If T ≧ YT4, the first flag F1 and the second flag F2 are set in STEP 26. Both are set to "1", an error is displayed in STEP 27, and an error stop is performed to extinguish the burning burner.

  Also, when it is determined in STEP 19 that H ≧ YH2, in order to avoid inconvenience to the user due to sudden disuse of the heat source unit, an error is displayed in STEP 28 and the hot water supply is separated from the simultaneous operation in STEP 29. Shift to driving. Thereafter, when it is determined in STEP 30 that the hot water supply operation has been stopped, the process proceeds to STEP 31 to shift to a bath single operation. In addition, although not shown in figure, when it transfers to hot water supply independent operation by STEP22, 29, the same control as STEP2-STEP9 is performed, and when it transfers to bath independent operation by STEP24, 31, the control similar to STEP10-STEP17 is performed. Do.

The first to third flags F1, F2, and F3 are stored in a nonvolatile memory provided in the controller 11 so that they are not erased even when the power is turned off. Then, the controller 11, when the start command of the hot water supply operation is opened tapping plug (first combustion start command of the burner 2 ₁₎ is issued and, being turned on the bath reheating switch start command bath operation (the when second combustion start command of the burner 2 ₂₎ is issued, reads these first to third flag F1, F2, F3, performs ignition control shown in FIG.

In the ignition control, first, in STEP 101, it is determined whether or not both the first flag F1 and the second flag F2 are set to “1”. If they are set, the process proceeds to STEP 102, where the first and first flags F1 and F2 are set. 2 ignition of both burners 2 ₁ and 2 ₂ is prohibited. Further, when it is determined that only the first flag F1 in STEP103 is set to "1", the process proceeds to STEP 104, first prohibited ignition of the burner _{2 1,} second only flag F1 is in STEP105 " when it is judged is set to 1 ", the process proceeds to STEP 106, prohibits the second ignition burner 2 _2. Therefore, it is determined in STEP 6 that T ≧ YT1 and the first flag F1 is set to “1”, T14 is determined as T ≧ YT2 and the second flag F2 is set to “1”, or T26 in T26 If it is determined as YT4 and the first flag F1 and the second flag F2 are set to “1”, an interlock is applied, and then repair is completed and the contractor does not reset these flags F1 and F2 to “0”. Combustion of the relevant burner is prohibited.

  Further, in the ignition control, in STEP 107, it is determined whether or not the third flag F3 is set to “1”. Here, the third flag F3 is set to “1” when the correction coefficient H is determined to be greater than or equal to the first determination value YH1 in STEP3 or STEP11, but wind blowing into the exhaust passage, curing sheet, or the like H ≧ YH1 may occur when the degree of blockage temporarily increases due to blockage of the exhaust port 9a. Prohibiting burning of the burner thereafter due to such a temporary increase in the degree of blockage will cause unnecessary inconvenience to the user.

Therefore, when the third flag F3 is set to “1”, the process proceeds to STEP 108, and the correction coefficient H is detected over a predetermined time in a state where only the combustion fan 6 is operated before ignition. Note that the predetermined time is set to, for example, 6 seconds so as not to be affected by a temporary change in the degree of blockage due to wind or the like. Then, the correction coefficient H is gradually updated during a predetermined time, or an average value of the correction coefficients H is obtained. Thereafter, the process proceeds to STEP 109, where it is determined whether or not the correction coefficient H detected in STEP 108 is less than the first determination value YH1. Then, if H <YH1, the process proceeds to STEP 111, the ignition from the rotated first burner 2 ₁ and the second burner 2 ₂ combustion fan 6 at a rotation speed obtained by multiplying the correction coefficient H in the reference speed during ignition To do.

  Further, when none of the first to third flags F1, F2, and F3 is set to “1”, that is, H ≧ YH1 is not determined in STEP3 and 11, and T ≧ YT1 is determined in STEP6. Even if the previous hot water single operation or bath single operation or simultaneous operation is normally stopped without being determined as T ≧ YT2 in STEP14 or as T ≧ YT4 in STEP25, the correction coefficient is set before ignition. It is conceivable to detect H and correct the fan speed at the time of ignition. However, in this case, it takes time until ignition after the operation start command is issued. Therefore, when the normal stop was performed last time, the process proceeds to STEP 110, and after reading the correction coefficient H stored in the nonvolatile memory, the process proceeds to STEP 111. Note that “normal stop” means that the hot-water tap is closed and hot water supply independent operation or simultaneous operation is stopped, the temperature of the bath water rises to the set temperature, or the bath reheating switch is turned off and the bath is operated independently. Or simultaneous operation is stopped.

  Here, it is conceivable that the correction coefficient H stored in the non-volatile memory is rewritten every time to the correction coefficient H detected when it is normally stopped, but in this case, the frequency of rewriting the correction coefficient H is very high. This adversely affects the durability of the nonvolatile memory. Therefore, in this embodiment, although not shown, the correction coefficient H detected when the operation is normally stopped is changed by a predetermined amount (for example, 0.04) or more from the correction coefficient H stored in the nonvolatile memory. Only in this case, the correction coefficient H stored in the nonvolatile memory is rewritten to the correction coefficient H detected this time.

Incidentally, in the present embodiment, since the second burner 2 ₂ and the second heat exchanger 3 ₂ is a first burner 2 ₁ and smaller than the first heat exchanger 3 _1, the second heat exchanger 3 ₂ fins It is set to a temperature lower than the first judgment temperature YT1 using the second judgment temperature YT2 used for the determination of the clogging determination of the first heat exchanger 3 ₁ fin clogging. In this case, when moving a bath isolated operation from single hot water supply run or simultaneous operation, when the detected temperature T of the temperature sensor 10 is equal to or higher than the second judgment temperature YT2, the second heat exchanger 3 ₂ fin jam even if not caused, it is determined that T ≧ YT2 at STEP 14, the combustion of the second burners _{2 2} from being stopped error. Further, when shifting from co-operating in single hot water supply run, the detected temperature T of the temperature sensor 10 is equal to or greater than the first judgment temperature YT1, even if no cause clogging first fin heat exchanger 3 ₁ , it is determined to T ≧ YT1 in STEP6, the first burner _{2 1} combustion has been halted errors. Further, when the power is turned off due to a power failure or the like, the combustion fan 6 is stopped. Therefore, even if the combustion of the burner is stopped, the partition wall 8 is heated by the residual heat, and the temperature T detected by the temperature sensor 10 rises to make the second determination. The temperature may be higher than YT2. In this case, restoring the power, when performing a bath islanding, it is determined that T ≧ YT2 at STEP 14, the combustion of the second burners 2 ₂ may possibly be stopped error.

Therefore, in the present embodiment, the determination prohibition control is performed in which the controller 11 prohibits the determination in STEPs 6 and 14 under a certain condition. The details of the discrimination prohibition control are as shown in FIG. 7. First, at STEP 201, it is discriminated whether or not the power is turned on again. When the power is turned on again, the routine proceeds to STEP 202 where the detected temperature T of the temperature sensor 10 is the first. 2 It is determined whether or not the determination temperature is YT2 or higher. If T ≧ YT2, it is determined in STEP 203 whether or not a predetermined time (for example, 120 seconds) has elapsed from the time when the power is turned on again, and when it has elapsed, the process proceeds to STEP 204 and the determination in STEP 6 and 14 is permitted. . If T <TY2, the process proceeds directly to STEP 204, and the discrimination in STEPs 6 and 14 is immediately permitted. According to this, when T ≧ YT2 when the power is turned on again, the determination in STEP 14 is prohibited until a predetermined time elapses, during which the detected temperature T of the temperature sensor 10 decreases and the second determination is made. The temperature becomes less than TY2. Therefore, when performing a bath islanding after a power cycle, though not occurred a second heat exchanger 3 ₂ fins clogged, the combustion of the second burners 2 ₂ can be prevented from being stopped error. Even when the bath is not operated alone, the time for which discrimination is prohibited is counted from the time when the power is turned on again. Therefore, the time from the start of bath independent operation until the start of discrimination in STEP 14 is shortened, which is safe.

If it is determined in STEP 205 that the bath single operation has been stopped, the process proceeds directly to STEP 204. If it is determined in STEP 206 that the hot water supply single operation has been stopped, the process proceeds to STEP 207 and the temperature T detected by the temperature sensor 10 is detected. Is determined to be equal to or higher than the second determination temperature YT2. If T ≧ YT2, it is determined in STEP 208 whether or not a predetermined time (for example, 100 seconds) has elapsed since the hot water supply operation stop time, and when it has elapsed, the process proceeds to STEP 204. Is prohibited. According to this, when moving a bath isolated operation from single hot water supply run, even if no cause second heat exchanger 3 ₂ fin clogging, it is determined that T ≧ YT2 at STEP 14, the second burner 2 ₂ It is possible to prevent the combustion of this from being stopped due to an error. Further, even if the bath independent operation is not started after the hot water supply independent operation is stopped, the discrimination prohibition time is counted. Therefore, the time from the start of the bath independent operation until the start of the discrimination in STEP 14 is shortened, which is safe.

Further, when it is determined that the simultaneous operation is stopped from the simultaneous operation to the hot water supply single operation or the bath single operation and the simultaneous operation is stopped in STEP 209, the process proceeds to STEP 210, and the detected temperature T of the temperature sensor 10 is equal to or higher than the first determination temperature YT1. If T <YT1, the process proceeds to STEP 211, where it is determined whether or not the detected temperature T of the temperature sensor 10 is equal to or higher than the second determination temperature YT2. If T ≧ YT2, it is determined in STEP 212 whether or not a predetermined time (for example, 150 seconds) has elapsed since the simultaneous operation stop point, and when it has elapsed, the process proceeds to STEP 204. Is prohibited. According to this, the simultaneous operation when moving a bath isolated operation, even if not result in second heat exchanger 3 ₂ fin clogging, it is determined that T ≧ YT2 at STEP 14, the second burner 2 ₂ It is possible to prevent combustion from being stopped due to an error.

If it is determined in STEP 210 that T ≧ YT1, it is determined in STEP 213 whether or not a predetermined time (for example, 150 seconds) has elapsed since the simultaneous operation stop time, and when it has elapsed, the process proceeds to STEP 214 and the determination in STEP 6 Until the time elapses, the determination in STEP 6 is prohibited. According to this, in the transition from co-operation in the single hot water supply run, even if no cause clogging first fin heat exchanger 3 _1, it is determined to T ≧ YT1 in STEP6, the first burner 2 ₁ It is possible to prevent combustion from being stopped due to an error.

Next, the single can type combined heat source machine of the second embodiment shown in FIG. 8 will be described. The basic structure of the second embodiment is similar to that of the first embodiment, the number of unit burner 2a constituting the second burner 2 ₂ one less than that of the first embodiment, the lower portion of the second combustion chamber 7 ₂ side of the wall plate 8a by a unit burner one roll to the second combustion chamber 7 ₂ side than those of the first embodiment of the partition wall 8 is larger offset. In this case, the lateral distance between the partition wall 8 and the second burner 2 ₂ becomes long, difficult even if the second heat exchanger 3 ₂ fin clogging combustion gas in the second burner 2 ₂ close to the partition wall 8 Thus, the detected temperature T of the temperature sensor 10 is unlikely to increase. Therefore, the area of the vent holes (not shown) to form an intermediate shoulder portion of the second combustion chamber 7 ₂ side wall plate 8a is made smaller than that of the first embodiment, the second combustion chamber 7 ₂ side The amount of air flowing along the outer surface of the wall plate 8a is reduced. As a result, the constant temperature during bath islanding operation is higher than the steady state temperature during the single hot water supply run, the second judgment temperature YT2 of the first heat exchanger 3 ₁ the fins to determine the second heat exchanger 3 ₂ fin jam It is necessary to set the temperature higher than the first determination temperature YT1 for determining clogging.

  Also in the second embodiment, the operation control and the ignition control are performed as shown in FIGS. 5 and 6 as in the first embodiment, but the level relationship between the first determination temperature YT1 and the second determination temperature YT2 is the first embodiment. Therefore, the discrimination prohibition control is performed as shown in FIG. That is, when it is determined in STEP 202 that the temperature T of the temperature sensor 10 is equal to or higher than the first determination temperature YT1 when the power is turned on again, or when the bath independent operation is stopped, the temperature T of the temperature sensor 10 is changed to the first determination temperature YT1 in STEP207. When it is determined that it is above or when it is determined in STEP211 that the temperature T of the temperature sensor 10 is equal to or higher than the first determination temperature YT1 when the simultaneous operation is stopped, the determination in STEP6 is prohibited until a predetermined time elapses. Further, when it is determined in STEP 210 that the temperature T of the temperature sensor 10 is equal to or higher than the second determination temperature YT2 when the simultaneous operation is stopped, the determination in STEP 14 is prohibited until a predetermined time elapses.

According to this, and when performing the single hot water supply run of restoring the power, in the transition from the bath alone operation or simultaneous operation in single hot water supply run, not occurring a 3 ₁ fin clogging first heat exchanger even, it is determined that T ≧ YT1 in STEP6, the combustion of the first burner 2 ₁ can be prevented that would be stopped error, further, when moving a bath islanding operation from simultaneous operation, the second heat exchanger 3 even if not result in _second fin clogging, it is determined that T ≧ YT2 at STEP 14, the combustion of the second burners 2 ₂ can be prevented from being stopped error.

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, in the combustion improvement control of STEPs 2, 5, 10, 13, and 18, the rotational speed of the combustion fan 6 is increased and corrected, but the first and second burners 2 ₁ and 2 ₂ The amount of combustion may be corrected to decrease, or the rotational speed of the combustion fan 6 may be corrected to increase and the amount of combustion of each burner 2 ₁ , 2 ₂ may be corrected to decrease. In the above embodiment, the correction coefficient H is used as a parameter representing the degree of blockage, and it is determined that fin clogging has occurred in both the first and second heat exchangers 3 ₁ and 3 ₂ when H ≧ YH1. However, when the fan current falls below a predetermined determination current determined according to the fan rotation speed, it is determined that the fins of the first and second heat exchangers 3 ₁ and 3 ₂ are clogged. It is also possible.

Moreover, in the said embodiment, although the air from the air supply chamber 5 is poured into the internal space and the outer surface of the partition wall 8, the air from the air supply chamber 5 is flowed only into the internal space of the partition wall 8, or It is also possible to cool the partition wall 8 by bringing both wall plates 8a, 8a of the partition wall 8 into close contact with each other and allowing air from the air supply chamber 5 to flow only on the outer surface of the partition wall 8. In this case, a hollow portion is formed in a part of the upper portion of the partition wall 8 facing both the first and second heat exchangers 3 ₁ and 3 ₂ without the wall plates 8a and 8a being in close contact with each other. The temperature sensor 10 is disposed in the hollow portion. Further, the partition wall 8 has a single plate structure, and air from the air supply chamber 5 flows on the outer surface of the partition wall 8 to air-cool the partition wall 8 and the first and second heat exchangers 3 ₁ and 3 _2. A hole extending in the front-rear direction may be formed in a part of the upper portion of the partition wall 8 facing, and the temperature sensor 10 may be inserted into a hollow portion constituted by the hole.

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, 6a ... fan motor, 7 ₁ ... first combustion chamber, 7 ₂ ... second combustion chamber, 8 ... partition wall, 9 ... exhaust hood (exhaust passage), 10 ... temperature sensor, 11 ... controller.

Claims (10)

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 1 can type combined heat source machine that supplies the working air from the air supply chamber to the first and second combustion chambers through the distribution holes formed in the distribution plate, the partition wall from the air supply chamber In what was air-cooled with air,
At least a part of the part of the partition wall facing both the first and second combustion chambers is formed hollow, and a temperature sensor is disposed in the hollow part,
A first discriminating means for discriminating that a fin clogging of the first heat exchanger has occurred when the temperature detected by the temperature sensor is equal to or higher than a predetermined first judgment temperature during single combustion of only the first burner;
And a second discriminating means for discriminating that the clogging of the second heat exchanger has occurred when the temperature detected by the temperature sensor becomes equal to or higher than a predetermined second judgment temperature during the single combustion of only the second burner. One can type combined heat source machine.   When it is determined that fin clogging has occurred in either the first determination means or the second determination means, combustion of the burning burner out of the first and second burners is stopped, and the subsequent The single-can composite heat source machine according to claim 1, wherein combustion of the burner is prohibited. In the can type combined heat source machine according to claim 2, wherein the first determination temperature and the second determination temperature are set to different temperatures.
Of the first determination temperature and the second determination temperature, the higher one is the high temperature determination temperature, the lower one is the low temperature determination temperature, and the first determination means and the second determination means are determined based on the high temperature determination temperature. What is to be performed is a high temperature determination means, and what is to be determined based on a low temperature determination temperature is a low temperature determination means.
When the simultaneous combustion of the first and second burners is stopped, or when the single burner of one of the first and second burners is discriminated by the high temperature discriminating means, the temperature detected by the temperature sensor is judged to be low. If the temperature is equal to or higher than the temperature, discrimination by the low temperature discrimination means is prohibited until a predetermined time has elapsed from the time when combustion is stopped, and when the simultaneous combustion of both the first and second burners is stopped, the temperature detected by the temperature sensor is higher than the high temperature judgment temperature. In some cases, the one-can type combined heat source unit is characterized in that discrimination by the high temperature discrimination means is prohibited until a predetermined time has elapsed since the combustion stop point.   After the power is turned off, if the detected temperature of the temperature sensor at the time when the power is turned on again is equal to or higher than the low temperature judgment temperature, the judgment by the low temperature judgment means is prohibited until a predetermined time elapses after the power is turned on again. The single can type combined heat source machine according to claim 3.   When the temperature detected by the temperature sensor is lower than the first determination temperature during the single combustion of only the first burner, when the temperature is equal to or higher than a predetermined first preliminary determination temperature set lower than the first determination temperature. The combustion improvement control for increasing the rotational speed of the combustion fan or correcting the decrease in the combustion amount of the first burner is performed, and the detected temperature of the temperature sensor is less than the second determination temperature during the single combustion of only the second burner. Even if it becomes more than the predetermined 2nd preliminary judgment temperature set lower than the 2nd judgment temperature, the combustion improvement control which carries out increase correction of the number of rotations of a combustion fan or reduction correction of the amount of combustion of the 2nd burner The can-type combined heat source machine according to any one of claims 2 to 4, wherein:   When the detected temperature of the temperature sensor becomes equal to or higher than a predetermined third determination temperature set higher than both the first and second determination temperatures during simultaneous combustion of the first and second burners, 6. One can type burner according to any one of claims 2 to 5, wherein one burner of one burner and the second burner is burned separately, and the other burner is burned alone after the burning of the one burner is stopped. Combined heat source machine. Based on the relative relationship between the rotational speed of the combustion fan and the fan current flowing through the fan motor that drives the combustion fan, the degree of blockage of the first and second heat exchangers and the exhaust passage connected to the two heat exchangers is detected. Occlusion detection means to
When the degree of blockage detected by the blockage detection means is equal to or greater than a predetermined first determination value during single combustion of either the first burner or the second burner, both the first and second burners are used. The single can type combined heat source machine according to any one of claims 2 to 6, further comprising third discriminating means for discriminating that the fins of the heat exchanger are clogged.   If the third discriminating unit determines that the clogging of the one burner has occurred during the single combustion of the one burner, the combustion of the one burner is stopped, and then a combustion start command for the first burner or the second burner is issued. In this case, the blockage detection means detects the blockage degree over a predetermined time with only the combustion fan being operated before ignition. When the detected blockage degree is less than the first determination value, the blockage degree is set to this blockage degree. 8. The single can type combined heat source machine according to claim 7, wherein the number of revolutions of the combustion fan is corrected accordingly and the first burner or the second burner is ignited.   When the degree of blockage detected by the blockage detection means becomes equal to or higher than a predetermined second determination value set lower than the first determination value during simultaneous combustion of the first and second burners, the first burner 9. The single can type combined heat source machine according to claim 8, wherein one burner of the first burner and the second burner are burned separately, and the other burner is burned alone after the combustion of the one burner is stopped.   The blockage degree detected by the blockage detection means when the combustion of the first and second burners is normally stopped without being determined as fin clogging by the first, second and third determination means is non-volatile. The blockage degree stored in the non-volatile memory is rewritten to the blockage degree detected this time only when the blockage degree stored in the non-volatile memory changes by a predetermined amount or more, and then the first burner or the second burner 9. The first burner or the second burner is ignited by correcting the rotational speed of the combustion fan in accordance with the degree of blockage stored in the nonvolatile memory when the combustion start command is issued. Or 1 can type compound heat source machine of 9.

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