JP6401631B2 - Heat source equipment - Google Patents

Description

  The present invention relates to a heat source apparatus having a latent heat recovery type heat source apparatus.

  Conventionally, this type of heat source device has a latent heat recovery type comprising a burner, a primary heat exchanger that recovers sensible heat from the combustion exhaust generated by combustion of the burner, a secondary heat exchanger that recovers latent heat from the combustion exhaust, and the like. Heating that heats the air-conditioned space in which the heat-dissipating terminal is installed by supplying the circulating fluid heated by the latent heat recovery-type heat source unit to the heat-dissipating terminal such as a floor heating panel by driving the circulation pump There was something to drive. (For example, refer to Patent Document 1.)

Japanese Patent No. 3533312

  By the way, in the conventional heat source device, when performing the heating operation, the combustion of the burner is controlled so that the circulating fluid becomes a temperature near the set temperature, and if the circulating fluid temperature exceeds the set temperature, Combustion of the burner is stopped, and combustion of the burner is resumed when the temperature of the circulating fluid becomes lower than the set temperature or the set temperature.

  During the heating operation, regardless of whether the burner is burned or stopped, the circulation pump continues to be driven and the circulating fluid continues to be supplied to the heat radiating terminal. The circulating fluid that has flowed out of the heat radiating terminal always passes through the secondary heat exchanger, and when the burner is burned, the latent heat in the combustion exhaust gas when the circulating fluid passes through the secondary heat exchanger. However, when the burner combustion is stopped, the circulating fluid is naturally dissipated as it passes through the secondary heat exchanger. If there is intrusion or the like, the heat dissipation of the secondary heat exchanger is promoted, the amount of heat dissipation increases, and the efficiency is deteriorated.

In order to solve the above-mentioned problems, the present invention is configured in particular in claim 1 to recover the sensible heat from the burner that burns the fuel and the combustion exhaust generated by the combustion in the burner, and circulate through the primary flow path. A primary heat exchanger for heating the circulating fluid, a secondary heat exchanger for recovering sensible heat or latent heat from the combustion exhaust after passing through the primary heat exchanger, and heating the circulating fluid flowing through the secondary flow path; A terminal, a circulating pump for circulating the circulating fluid heated by the primary heat exchanger and the secondary heat exchanger to the terminal, temperature detecting means for detecting the temperature of the circulating fluid, and driving the circulating pump; Circulation detected by the temperature detection means by executing or stopping combustion of the burner during a circulation operation in which the circulating fluid returned from the terminal is circulated from the secondary flow path to the primary flow path and circulated again to the terminal. The liquid temperature reaches the set temperature. In the heat source apparatus including the control unit that controls the bypass channel, the circulating fluid returned from the terminal bypasses the secondary channel and leads to the primary channel, and the circulating fluid returned from the terminal And a flow path switching means for switching between a normal state in which a flow path returning to the secondary flow path side is formed or a bypass state in which a flow path returning to the bypass flow path side is formed, and the control unit is in the circulation operation when the combustion of the burner there is running, the flow path switching means in said normal state, the circulating liquid is returned from said terminal, said primary flow channel were allowed to flow the secondary flow path so as to flow, when said combustion of the burner even during circulation operation is stopped, the flow path switching means in said bypass state, the circulating liquid is returned from said terminal, said bypass passage Circulate The circulating liquid by circulating et the primary flow path was assumed to return to the primary flow path without passing through the secondary flow path.

  According to a second aspect of the present invention, when the combustion of the burner is restarted from the state where the combustion of the burner is stopped during the circulation operation, the control unit performs the flow after the burner ignites. The path switching means is assumed to be in a normal state.

According to claim 1 of the present invention, the control unit may, when a circulating operation combustion of the burner is running, and a flow path switching means and the normal state, the circulating fluid that is returned from the terminal, the two was circulated following passage so as to circulate the primary flow path from, when a circulating operation combustion of the burner is stopped, and the flow path switching means and the bypass state, the circulation returned from the terminal Burning of the burner is performed by flowing the liquid through the bypass flow path and then flowing through the primary flow path to return the circulating liquid to the primary flow path without passing through the secondary flow path . When improving the efficiency by recovering sensible heat or latent heat in the combustion exhaust with the secondary heat exchanger by heat exchange between the circulating fluid flowing through the secondary flow path of the secondary heat exchanger and the combustion exhaust When the combustion of the burner is stopped, the circulating fluid Since it does not pass through the secondary flow path of the secondary heat exchanger, it is returned directly to the primary flow side of the primary heat exchanger through the bypass flow path. It is possible to prevent deterioration of the efficiency by preventing the heat from being circulated in the secondary heat exchanger due to the outside air blowing into the heat exchanger or the intrusion of rain.

According to a second aspect of the present invention, when the combustion of the burner is restarted from the state where the combustion of the burner is stopped during the circulation operation, the control unit switches the flow path switching means after the burner ignites. The normal operation of the air conditioner promotes heat dissipation of the circulating fluid in the secondary heat exchanger by the purge operation performed before the burner ignition, that is, the air blowing operation that blows off the unburned gas remaining in the exhaust passage. Can be prevented.
It can be done.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the heat-source apparatus of one Embodiment of this invention. Explanatory drawing which shows the flow of the circulating fluid at the time of combustion of the heat-source apparatus of the same embodiment. Explanatory drawing which shows the flow of the circulating fluid at the time of the combustion stop of the heat-source apparatus of the same embodiment. The schematic block diagram which shows the heat-source apparatus of other embodiment of this invention.

Next, a heat source device according to an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a heat source device of the present embodiment, and reference numeral 2 denotes a latent heat recovery type heat source device that heats circulating fluid such as water or antifreeze.

  The heat source unit 2 receives the combustion air supplied from the blower fan 3 and burns the fuel, and collects sensible heat from the combustion exhaust generated by the combustion of the burner 4 and distributes the sensible heat through the primary flow path 5. A primary heat exchanger 6 as a heat exchanger that heats the circulating fluid, and sensible heat or latent heat is recovered from the combustion exhaust gas that has passed through the primary heat exchanger 6 and the circulating fluid that flows through the secondary flow path 7 is heated. A secondary heat exchanger 8 as a heat exchanger and an exhaust pipe 9 through which combustion exhaust gas after passing through the secondary heat exchanger 8 circulates are provided.

  The primary heat exchanger 6 includes a cylindrical hot water storage can body 10 for storing a certain amount of circulating liquid therein, a combustion chamber 11 formed inside the hot water storage can body 10 in which the burner 4 is combusted, and a hot water storage can. An exhaust chamber 12 formed in the upper part of the body 10, and a plurality of smoke pipes 13 communicating with the combustion chamber 11 and the exhaust chamber 12 and allowing the combustion exhaust generated by the combustion of the burner 4 to pass therethrough. The path 5 corresponds to a portion where the circulating liquid in the hot water storage can 10 is stored. Reference numeral 14 denotes a temperature sensor as temperature detection means for detecting the temperature of the circulating fluid in the hot water storage can body 10.

  15 is a neutralizer 16 which removes strongly acidic drain produced by the heat exchange of the water vapor in the combustion exhaust gas with the circulating fluid flowing through the secondary flow path 7 of the secondary heat exchanger 8 to a temperature below the dew point. The drain introduced into the neutralizer 16 is neutralized by a neutralizing agent made of calcium carbonate or the like housed in the neutralizer 16, and the neutralized drain is drained. It is discharged from 17 to the outside.

  Reference numeral 18 denotes a heat radiating terminal as a terminal such as a floor heating panel or a panel convector that radiates the heat retained in the circulating fluid flowing inside and heats the air-conditioned space. Reference numeral 19 denotes a water discharge side of the heat radiating terminal 18 and water entering the secondary flow path 7. The heating return flow path 20 for connecting the circulating fluid flowing out from the heat radiating terminal 18 to the secondary flow path 7, and the water discharge side 18 of the primary flow path 5 and the water inlet terminal 18 inlet side are connected to the heat radiating terminal 18. A heating forward flow path that guides the circulating fluid heated by the primary heat exchanger 6 and the secondary heat exchanger 8, and 21 is a connection flow path that connects the outlet side of the secondary path 7 and the incoming side of the primary path 5. It is.

  22 is branched from the heating return flow path 19, bypasses the secondary flow path 7 of the secondary heat exchanger 8 and leads the circulating fluid to the primary flow path 5 side, and 23 is returned from the heat radiating terminal 18 and returned to the heating. The circulating fluid flowing through the flow path 19 is switched between a normal state in which a flow path returning to the secondary flow path 7 side of the secondary heat exchanger 8 is formed and a bypass state in which a flow path returning to the bypass flow path 22 side is formed. It is a three-way valve as a flow path switching means. A circulation circuit 24 in which the circulating fluid circulates is formed by the heat radiating terminal 18, the heating return flow path 19, the heating forward flow path 20, the connection flow path 21, the bypass flow path 22, the primary flow path 5, and the secondary flow path 7. It is what has been.

  A circulation pump 25 is provided in the heating forward flow path 20 and circulates the circulating liquid heated by the primary heat exchanger 6 and the secondary heat exchanger 8 to the heat radiating terminal 18. The air-water separator 27 for separating the air and the circulating fluid therein absorbs the volume expansion when the circulating fluid circulating in the circulation circuit 24 becomes high temperature and undergoes volume expansion, and conversely, the circulating fluid has a low temperature. When the volume shrinks, the expansion tank replenishes the volume shrinkage.

  Reference numeral 28 denotes a remote controller for instructing operation of the heat source device 1. The remote controller 28 heats the circulating fluid by the heat source device 2 and drives the circulating pump 25 to supply the circulating fluid returned from the heat radiating terminal 18 to the secondary flow path 7. An operation switch 29 for instructing the start or stop of the heating operation as a circulation operation in which the air-conditioning space such as the room is heated by being circulated to the primary flow path 5 and circulated to the heat radiating terminal 18 again. A temperature setting switch 30 is provided as setting means for setting the temperature of the circulating fluid that is heated and circulated through the circulation circuit 24, and a display unit 31 that displays the temperature set by the temperature setting switch 30 and the like.

  Reference numeral 32 denotes a control unit that controls the heat source device 1 mainly using a microcomputer. The control unit 32 receives a signal from the remote control 28 and a signal from the temperature sensor 14, and the blower 3, the burner 4, the three-way valve 23, and the circulation pump 25. It controls the operation.

  The control unit 32 can control the fuel pump (not shown) for supplying fuel to the blower fan 3 and the burner 4 to vary the amount of combustion, and can detect the temperature sensor 14 during the heating operation. The temperature of the circulating fluid in the hot water storage can body 10 is controlled to be a temperature around the set temperature set by the temperature setting switch 30 of the remote controller 28. At the start of the heating operation, the temperature of the circulating fluid is set to the set temperature. The combustion amount of the burner 4 is set to a preset upper limit combustion amount so as to rise quickly, and then the combustion amount of the burner 4 is gradually lowered as the temperature of the circulating fluid approaches the set temperature. If it is possible to maintain the temperature of the engine at the preset temperature, combustion is performed with the combustion amount lowered to the preset lower limit combustion amount, and when the temperature of the circulating fluid reaches the combustion off temperature that is a predetermined temperature higher than the preset temperature, 4 is stopped, and when the temperature of the circulating fluid reaches a set temperature or a combustion on temperature lower than the set temperature by a predetermined temperature, combustion of the burner 4 is started, and the temperature of the circulating fluid in the hot water storage can 10 is set to the set temperature. The amount of combustion is appropriately controlled so as to approach it.

  The controller 32 controls the three-way valve 23 during the heating operation to switch the flow path through which the circulating fluid flows. When the burner 4 is being burned, the three-way valve 23 is turned on. In the normal state of forming a flow path for returning the circulating fluid flowing out from the heat radiating terminal 18 and flowing through the heating return flow path 19 to the secondary flow path 7 side of the secondary heat exchanger 8, When the combustion is stopped, the three-way valve 23 is set to a bypass state that forms a flow path that returns the circulating fluid that flows out of the heat dissipation terminal 18 and flows through the heating return flow path 19 to the bypass flow path 22 side. is there.

Next, operation | movement of the heat-source apparatus 1 of this one Embodiment is demonstrated.
When the operation switch 29 of the remote control 28 is operated and an instruction to start the heating operation is given, the control unit 32 drives the blower fan 3 and the fuel pump (not shown) to start combustion in the burner 4 to perform primary operation. The circulating fluid is heated by the heat exchanger 6 and the secondary heat exchanger 8, and the circulating pump 25 is driven to supply the heated circulating fluid to the heat radiating terminal 18.

  The control unit 32 controls the burner 4 so that the temperature of the circulating fluid in the hot water storage can 10 detected by the temperature sensor 14 becomes a temperature around the set temperature set by the temperature setting switch 30 of the remote controller 28 during the heating operation. The combustion amount of the burner 4 is set to a preset upper limit combustion so that the temperature of the circulating fluid quickly rises to the set temperature at the start of heating operation. After that, if the circulating fluid temperature approaches the set temperature, the combustion amount of the burner 4 is gradually decreased, and if it is possible to maintain the circulating fluid temperature at the set temperature, a preset lower limit is set. Combustion is performed by reducing the combustion amount to the combustion amount, and when the temperature of the circulating fluid reaches a combustion off temperature that is higher than the set temperature by a predetermined temperature, combustion of the burner 4 is stopped, and the temperature of the circulating fluid is predetermined from the set temperature or the set temperature Warm Upon reaching lower combustion on temperature, to initiate the combustion of the burner 4, and controls the combustion amount needed to approach the temperature of the circulating fluid in the hot water boiler body 10 to the set temperature.

  Here, the combustion exhaust generated by the combustion of the burner 4 during the heating operation flows through the smoke pipe 13 of the primary heat exchanger 6, passes through the smoke pipe 13 of the primary heat exchanger 6, and then passes through the exhaust chamber 12. After passing through the secondary heat exchanger 8 and passing through the secondary heat exchanger 8, it passes through the exhaust pipe 9 and is discharged to the outside. When the combustion exhaust gas passes through the secondary heat exchanger 8, the water vapor in the combustion exhaust gas becomes a temperature below the dew point, so that strongly acidic drain is generated. The generated drain is introduced to the neutralizer 16. In other words, the neutralizer 16 is neutralized with a neutralizer.

  During the heating operation, the circulation pump 25 is driven and the circulating fluid continuously circulates to the heat radiating terminal 18 regardless of whether the burner 4 is burned or stopped. However, when the combustion of the burner 4 is being performed, the control unit 32 passes the three-way valve 23, the circulating fluid flowing out of the heat radiating terminal 18 and flowing through the heating return channel 19 into the secondary channel 7. In the normal state in which the flow path returning to the side is formed, the circulating fluid circulating in the circulation circuit 24 flows out of the heat radiating terminal 18 and then flows from the heating return flow path 19 to the secondary flow path as shown by the thick line in FIG. 7, and from there through the primary flow path 5 via the connection flow path 21, the secondary flow path 7 and the primary flow path 5 are heated by heat exchange with the combustion exhaust gas, and the primary flow path The circulating fluid that has flowed out of 5 circulates in the heating forward pipe 20 and is supplied to the heat radiating terminal 18. It is, after passing through the heat radiating terminal 18 is intended to return to the heating return channel 19 secondary flow path 7 through again.

  On the other hand, when the heating operation is being performed and the combustion of the burner 4 is stopped, the control unit 32 bypasses the three-way valve 23 and the circulating fluid flowing out of the heat radiating terminal 18 and flowing through the heating return flow path 19. As shown by the thick line in FIG. 3, the circulating fluid that is in a bypass state that forms a flow path returning to the 22 side flows out of the heat radiating terminal 18 and then bypasses the bypass flow path from the heating return flow path 19, as shown by the thick line in FIG. 22, and is then led to the primary flow path 5 through the connection flow path 21, so that the circulating liquid is directly returned to the primary flow path 5 without passing through the secondary flow path 7. The circulating fluid that has flowed through the primary flow path 5 flows through the heating forward pipe 20 and is supplied to the heat radiating terminal 18, and after passing through the heat radiating terminal 18, returns to the bypass flow path 22 through the heating return flow path 19 again.

  In the heating operation, when the combustion of the burner 4 is stopped, the temperature of the circulating fluid detected by the temperature sensor 14 reaches the combustion on temperature, and the combustion of the burner 4 is stopped. When the combustion of the burner 4 is resumed from after the control unit 32, after the burner 4 is ignited, the control unit 32 sets a flow path for returning the circulating fluid flowing through the heating return flow path 19 through the three-way valve 23 to the secondary flow path 7 side. The normal state is formed.

  In the heating operation described above, the control unit 32 circulates through the three-way valve 23 from the heat radiating terminal 18 and circulates through the heating return flow channel 19 when the burner 4 is being burned during the heating operation. In a normal state in which a flow path for returning the liquid to the secondary flow path 7 side of the secondary heat exchanger 8 is formed, the circulating liquid is allowed to flow to the secondary flow path 7 of the secondary heat exchanger 8, and during the heating operation When the combustion of the burner 4 is stopped, the bypass state in which the three-way valve 23 is returned from the heat radiating terminal 18 to form a flow path for returning the circulating fluid flowing through the heating return flow path 19 to the bypass flow path 22 side. When the burner 4 is being burned by bypassing the circulating fluid so as not to flow into the secondary flow path 7 of the secondary heat exchanger 8, the secondary flow path of the secondary heat exchanger 8 7 is exchanged by the secondary heat exchanger 8 by heat exchange between the circulating fluid flowing through The sensible heat or latent heat can be recovered to improve efficiency, and when the combustion of the burner 4 is stopped, the circulating fluid does not pass through the secondary flow path 7 of the secondary heat exchanger 8 and is bypassed. Since it is returned directly to the primary flow path 5 side of the primary heat exchanger 6 through the flow path 22, natural heat dissipation in the secondary heat exchanger 8 and to the secondary heat exchanger 8 through the exhaust tube 9 from the outside. Thus, the heat dissipation of the circulating fluid in the secondary heat exchanger 8 due to the blowing of outside air or the intrusion of rain is not promoted, and the deterioration of efficiency can be suppressed.

  Further, when the combustion of the burner 4 is resumed from the state in which the combustion of the burner 4 is stopped, the control unit 32 circulates the circulating fluid flowing through the heating return passage 19 through the three-way valve 23 after the burner 4 ignites. In a normal state in which a flow path for returning to the secondary flow path 7 is formed, the purge operation performed before the burner 4 is ignited, that is, only the blower fan 3 is driven to communicate with the combustion chamber 11 and the combustion exhaust gas is discharged. It is possible to prevent the heat release of the circulating fluid in the secondary heat exchanger 8 from being promoted by the blowing operation for blowing off the unburned gas remaining in the passing exhaust passage.

  In addition, although this invention is not limited to said one Embodiment, In this embodiment, although the primary heat exchanger 6 was made into the hot water storage type heat exchanger which has the hot water storage can body 10, primary heat exchanger 6 4 may be a fin tube type heat exchanger as shown in FIG. 4, and when the primary heat exchanger 6 is a fin tube type heat exchanger, the temperature of the circulating fluid flowing out from the primary flow path 5 For example, a temperature sensor 14 as a temperature detecting means is provided in the heating forward flow path 20 at a position close to the water discharge side of the primary flow path 5, and the temperature of the circulating fluid detected by the temperature sensor 14 is close to the set temperature. What is necessary is just to control the combustion of the burner 4 so that it may become temperature.

  Further, in the present embodiment, the combustion of the burner 4 is controlled so that the temperature of the circulating fluid in the hot water storage can body 10 detected by the temperature sensor 14 becomes a temperature near the set temperature set by the temperature setting switch 30 of the remote controller 28. However, the temperature sensor 14 detects the temperature of the circulating fluid flowing out from the heat radiating terminal 18, and the temperature of the circulating fluid detected by the temperature sensor 14 is set by the temperature setting switch 30 of the remote controller 28. It is good also as what controls combustion of burner 4 so that it may become near temperature.

  In the present embodiment, the bypass flow path 22 is connected to the connection flow path 21, but the bypass flow path 22 is not connected to the connection flow path 21 but directly connected to the primary flow path 5. It may be.

  In the present embodiment, the three-way valve 23 is applied as the flow path switching means, but instead of the three-way valve 23, the heating near the secondary flow path 7 from the branch point between the heating return flow path 19 and the bypass flow path 22 is performed. An open / close valve is provided in the return flow path 19 and an open / close valve is provided in the bypass flow path 22, and these open / close valves may be used as the flow path switching means. When heating is being performed and the burner 4 is combusting, the opening / closing valve of the heating return passage 19 is opened, the opening / closing valve of the bypass passage 22 is closed, and the heat radiating terminal 18 is in a normal state of forming a flow path for returning the circulating fluid flowing out from 18 and flowing through the heating return flow path 19 to the secondary flow path 7 side of the secondary heat exchanger 8, and the burner 4 is combusted during the heating operation. When it is stopped, close the open / close valve of the heating return flow path 19. If the on-off valve of the ipass channel 22 is opened and a bypass state is formed that forms a channel that returns the circulating fluid flowing out of the heat radiating terminal 18 and flowing through the heating return channel 19 to the bypass channel 22 side, the three-way valve The same operation as that of No. 23 can be executed.

  Further, in the present embodiment, the present invention is applied to a heat source device that has a heat radiation terminal 18 such as a floor heating panel or a panel convector as a terminal and can perform a heating operation as a circulation operation. The present invention may be applied to a heat source device as a hot water heater with an immediate hot water function that has a cap and can perform a circulating heat insulation operation as a circulating operation, in which case, when hot water is not being supplied from the hot water tap, Combustion is controlled so as to keep the temperature of the circulating fluid (warm water) circulating between the hot water tap and the heat source device 2 at a set temperature, and the control unit 32 is in circulation operation and combustion of the burner 4 is executed. The three-way valve 23 is in a normal state in which a flow path for returning the circulating liquid returned from the hot water tap to the secondary flow path 7 side of the secondary heat exchanger 8 is formed, and the circulating liquid is in the secondary heat exchanger 8. So that it flows through the secondary flow path 7 of the When combustion of the na 4 is stopped, the three-way valve 23 is set to a bypass state that forms a flow path for returning the circulating fluid returned from the heat radiating terminal 18 to the bypass channel 22 side, and the circulating fluid is a secondary heat exchanger. By bypassing so as not to flow into the secondary flow path 7 of 8, the same effect as that in the heating operation of the embodiment described above can be obtained.

4 Burner 5 Primary flow path 6 Primary heat exchanger 7 Secondary flow path 8 Secondary heat exchanger 14 Temperature sensor 18 Heat radiation terminal 22 Bypass flow path 23 Three-way valve 25 Circulation pump 32 Control unit

Claims (2)

A burner that burns fuel, a primary heat exchanger that recovers sensible heat from the combustion exhaust generated by combustion in the burner and heats the circulating fluid that flows through the primary flow path, and after passing through the primary heat exchanger A secondary heat exchanger that recovers sensible heat or latent heat from combustion exhaust and heats the circulating fluid flowing through the secondary flow path, a terminal, and the circulating fluid heated by the primary heat exchanger and the secondary heat exchanger A circulating pump that circulates to the terminal, temperature detecting means for detecting the temperature of the circulating fluid, and circulating fluid returned from the terminal by driving the circulating pump from the secondary channel to the primary channel. And a control unit that controls the temperature of the circulating fluid detected by the temperature detecting means to be set to a predetermined temperature by executing or stopping the combustion of the burner at the time of circulating operation to be circulated again to the terminal. Returned from the terminal A bypass flow path that bypasses the secondary flow path to the primary flow path and a flow path that returns the circulating liquid returned from the terminal to the secondary flow path side or the bypass flow. A flow path switching means for switching to a bypass state that forms a flow path to return to the road side, and the control section is configured to switch the flow path switching means during the circulation operation and when the burner is being burned. the was with the normal state, the circulating liquid is returned from said terminal, said from by circulating secondary flow path so as to flow the primary flow path, the combustion of the burner even during the circulation operation is stopped when that is, the flow path switching means in said bypass state, the circulating liquid is returned from the terminal, the circulating liquid by circulating the primary flow path from the by flowing through the bypass passage the two Without going through the next channel Serial heat source apparatus being characterized in that the back to the primary channel.   When the combustion of the burner is restarted from the state where the combustion of the burner is stopped during the circulation operation, the control unit sets the flow path switching means to the normal state after the burner ignites. The heat source device according to claim 1, wherein the heat source device is configured as described above.

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