JP2017003137A - Latent heat recovery type heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latent heat recovery type heat source machine capable of properly discharging drain even when water level detection means for detecting a drain water level in a neutralizer fails.SOLUTION: A latent heat recovery type heat source machine 1 includes: a heat exchange part 5 in which drain is generated; a neutralizer 13 having an introduction port 17 in which the drain generated in the heat exchange part 5 is introduced and a discharge port 18 for discharging the drain after neutralization; water level detection means 14 for detecting the water level of the drain stored in the neutralizer 13; a drain discharge pipe 23 connected to the discharge port 18 of the neutralizer 13; opening/closing means 24 for opening/closing the drain discharge pipe 23; and control means 37 for, when the water level detection means 14 has detected that the water level of the drain has reached at least a predetermined height, opening the opening/closing means 24 and controlling so as to discharge the neutralized drain from the neutralizer 13. Timing means 38, 39 are provided for counting time, and the control means 37 opens the opening/closing means 24 when the count time of the timing means 38, 39 reaches a preset predetermined time.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a latent heat recovery type heat source device provided with a neutralizer for neutralizing drain.

  Conventionally, in this type of latent heat recovery type heat source machine, a heat exchanger that generates drain by the burner and the combustion gas generated by combustion in the burner being below the dew point due to heat exchange with the heated fluid, In order to detect the water level of the drain, the neutralizer that neutralizes the drain generated in the exchange, the piping connected to the drain outlet of the neutralizer, the on-off valve that opens and closes the piping, and the drain In some cases, the on-off valve is opened when it is determined that the drain is staying above a predetermined water level based on the detection signal of the water level detection sensor. (For example, refer to Patent Document 1.)

JP 2008-185296 A

  By the way, in this conventional latent heat recovery type heat source machine, when there is a failure in the water level detection sensor or a connection error of the water level detection sensor and the water level of the drain cannot be monitored, the on-off valve remains closed. If the drain accumulates sequentially in the neutralizer and the drain accumulates in excess of the neutralizer volume, the drain may overflow from the neutralizer, and the drain overflows from the neutralizer and leaks into the instrument. There is a risk that the device arranged below the neutralizer will be covered with drain that has not been neutralized, resulting in failure. Also, if the drain does not overflow from the neutralizer, and the combustion gas communicating with the neutralizer accumulates in the combustion gas flow path, the combustion gas flow path will be blocked, resulting in poor combustion and failure. There is a problem that it may cause complete combustion and adversely affect the combustion function.

  In order to solve the above-mentioned problems, the present invention is particularly configured in claim 1 in that the burner that burns the fuel and the combustion gas generated by the combustion in the burner are brought to a dew point or lower by heat exchange with the fluid to be heated. The heat exchange part in which the drain is generated, and the introduction of the neutralizer for neutralizing the drain generated in the heat exchange part and the introduction of the drain generated in the heat exchange part And a neutralizer having an outlet and a discharge port for discharging the neutralized drain, a water level detection means for detecting the water level of the drain stored in the neutralizer, and connected to the discharge port of the neutralizer A drain drain pipe, an opening / closing means for opening / closing the drain drain pipe, and the neutralizer by opening the opening / closing means when the water level detecting means detects that the water level of the drain has reached a predetermined height or more. Drain the neutralized drain from A latent heat recovery type heat source machine comprising a control means for controlling the time, and provided with a time measuring means for counting time, the control means is configured to open and close when the count time of the time measuring means reaches a predetermined time set in advance. The means were to be established.

  According to a second aspect of the present invention, the time counting means counts the time when the opening / closing means is closed.

  According to a third aspect of the present invention, the time counting means counts the burn time of the burner.

  According to a fourth aspect of the present invention, when the burner is being burned when the count time of the timing means reaches the predetermined time, the control means opens the opening / closing means after the burner has stopped burning. It was supposed to be.

  According to the first aspect of the present invention, when the water level detecting means detects that the water level of the drain has reached a predetermined height or more, the open / close means is opened to drain the neutralized drain from the neutralizer. In the latent heat recovery type heat source machine, there is provided time measuring means for counting time, and the control means opens the opening / closing means when the count time of the time measuring means reaches a predetermined time, so that the water level detecting means Even if the drain water level in the neutralizer cannot be monitored due to a failure, the opening / closing means is opened when the predetermined time is reached, so that the drain is accumulated beyond the volume of the neutralizer with the opening / closing means closed. It is possible to prevent the situation that drain overflows from the neutralizer, and it is assumed that the drain does not overflow from the neutralizer. In which it is possible to prevent a situation such that adversely affect the combustion functionality accumulate it in.

  According to claim 2, the time counting means counts the time when the opening / closing means is closed, so that the water level detection means fails and the drain water level in the neutralizer cannot be monitored. Even if the opening / closing means is closed, the opening / closing means is opened based on the time during which the opening / closing means is closed, so that the drain is accumulated more than the volume of the neutralizer while the opening / closing means is closed, and the drain overflows from the neutralizer. If the drain does not overflow from the neutralizer, it can adversely affect the combustion function by accumulating in the combustion gas flow path such as the heat exchange section where the combustion gas communicating with the neutralizer flows. It is possible to prevent such a situation.

  Further, according to claim 3, the time measuring means counts the combustion time of the burner, so that even if the water level detecting means fails and the drain water level in the neutralizer cannot be monitored, Since the opening / closing means can be opened at an appropriate timing based on the combustion time correlated with the amount of generated drain, the drain is accumulated beyond the volume of the neutralizer while the opening / closing means is closed, and the drain is neutralized. It is possible to prevent a situation such as overflow from the neutralizer, and if the drain does not overflow from the neutralizer, it is burned by collecting in the combustion gas flow path such as the heat exchange section where the combustion gas communicating with the neutralizer flows It is possible to prevent such a situation that the function is adversely affected.

  According to the fourth aspect of the present invention, when the burner is being burned when the count time of the time counting means reaches a predetermined time, the control means opens the opening / closing means after the burner has stopped burning, thereby There is no fear of leakage of combustion gas to the outside through a neutralizer communicating with a combustion gas flow path such as a heat exchange section through which gas flows, and safety can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the latent-heat recovery type heat source machine of 1st Embodiment of this invention. The flowchart which shows the on-off control of the on-off valve of the 1st embodiment. The flowchart which shows the other on-off control of the on-off valve of the said 1st Embodiment. The schematic block diagram which shows the latent-heat-recovery type heat source machine of 2nd Embodiment of this invention. The flowchart which shows the on-off control of the on-off valve of the 2nd embodiment.

Next, a latent heat recovery type heat source machine according to a first embodiment of the present invention will be described with reference to FIG.
1 is a latent heat recovery type water heater as a latent heat recovery type heat source device of the present embodiment, 2 is a burner for burning fuel such as oil, 3 is a blower for supplying combustion air to the burner 2, 4 is above the burner 2 Combustion chamber 5, in which combustion gas flows, is a heat exchanging part housed in the combustion chamber 4.

  The heat exchange unit 5 includes a finned tube type primary heat exchanger 7 that recovers sensible heat from the combustion gas generated by the combustion of the burner 2 and heats water as a fluid to be heated that flows through the primary heat receiving pipe 6. A secondary heat exchanger 9 that recovers latent heat from the combustion gas that has passed through the heat exchanger 7 and heats water as a fluid to be heated that circulates through the secondary heat receiving pipe 8, and the primary heat exchanger 7, The combustion gas that has passed through the secondary heat exchanger 9 in this order is exhausted from the exhaust port 10 to the outside of the latent heat recovery type water heater 1.

  11 is a drain receiver that recovers strongly acidic drain produced by the heat exchange of the water vapor in the combustion gas with the water flowing through the secondary heat receiving pipe 8 of the secondary heat exchanger 9 to a temperature below the dew point. These are disposed below the secondary heat exchanger 9. Reference numeral 12 denotes a drain introduction pipe that guides the drain recovered by the drain receiver 11 to the neutralizer 13.

  The neutralizer 13 includes a water level detection chamber 15 having a pair of water level detection electrodes 14 serving as a water level detection means for detecting the water level of the drain stored in the neutralizer 13, and a carbon dioxide in communication with the water level detection chamber 15. A neutralizing chamber 16 filled with a neutralizing agent made of calcium and storing and neutralizing drain generated in the secondary heat exchanger 9. A drain introduction pipe 12 is provided on the upper wall of the water level detecting chamber 15. A cylindrical inlet 17 for introducing the drain into the water level detection chamber 15 is formed, and the neutralized drain stored in the neutralization chamber 16 is discharged to the outside of the neutralizer 13 on one side wall of the neutralization chamber 16. A cylindrical discharge port 18 extending in the horizontal direction is formed.

  The neutralization chamber 16 communicates with the water level detection chamber 15 by the partition wall 19 extending from the upper wall of the neutralizer 13 toward the bottom wall of the neutralizer 13 and partitioning the inside, and is positioned upstream as the drain flow direction. A communication section that is partitioned into a first neutralization chamber 20 and a second neutralization chamber 21 that is positioned downstream as a drain flow direction, and that communicates the first neutralization chamber 20 and the second neutralization chamber 21 with the lower end side of the partition wall 19. 22 is formed. In addition, the discharge port 18 formed on one side wall of the second neutralization chamber 21 as the neutralization chamber 16 is located above the height position of the lower end of the partition wall 19 and at the lower end of the water level detection electrode 14. It is located below the height position.

  A drain drain pipe 23 is connected to the outlet 18 and drains the neutralized drain discharged from the neutralizer 13 to the outside, and 24 is provided in the middle of the drain drain pipe 23 to open and close the drain drain pipe 23 to open and close the drain. It is an opening / closing valve as an opening / closing means for starting and stopping drainage.

  A water supply pipe 25 circulates water supplied from a water supply source to the heat exchanger 5, 26 circulates hot water heated by the heat exchanger 5, and hot water is supplied to a hot water tap (not shown) provided at a predetermined location. A hot water supply pipe 27 for supplying water is a water supply bypass pipe branched from the water supply pipe 25.

  A mixing valve 28 is provided at a connection portion between the hot water supply pipe 26 and the water supply bypass pipe 27, mixes hot water from the hot water supply pipe 26 and water from the water supply bypass pipe 27, and 29 can change the mixing ratio. A water supply temperature sensor provided in 25 for detecting the temperature of the water supply, 30 a flow sensor for detecting the flow rate provided in the water supply pipe 25, and 31 a temperature sensor for detecting the temperature of hot water provided in the hot water supply pipe 26 and heated by the heat exchanger 5. A heat exchange outlet temperature sensor 32 is a hot water supply temperature sensor that is provided in the hot water supply pipe 26 on the downstream side of the mixing valve 28 and detects the temperature of the hot water mixed by the mixing valve 28.

  Reference numeral 33 denotes a remote controller for instructing operation of the latent heat recovery type hot water heater 1. The remote controller 33 includes an operation switch 34 for instructing on / off operation of the latent heat recovery type hot water heater 1 and a hot water temperature setting switch for setting the hot water temperature. And a display unit 36 for displaying the state of the latent heat recovery type hot water heater 1, the hot water supply set temperature, and the like.

  Reference numeral 37 is mainly a microcomputer, which receives signals from the water level detection electrode 14, the water supply temperature sensor 29, the flow rate sensor 30, the heat exchange outlet temperature sensor 31, the hot water supply temperature sensor 32, and the remote control 33 of the latent heat recovery type hot water heater 1. The control means 37 controls the drive of each actuator such as the receiver, the blower 3, the on-off valve 24, the mixing valve 28, etc. The control means 37 serves as a time measuring means for counting the time when the on-off valve 24 is closed. The first counter 38 is provided.

Next, the operation of the latent heat recovery type water heater 1 of the first embodiment will be described.
When the operation switch 34 of the remote controller 33 is in an ON state, a hot water tap (not shown) provided at a predetermined location is opened, and the flow rate sensor 30 detects a flow rate that is equal to or higher than the minimum operating flow rate, thereby generating a combustion request. If the control means 37 determines that it has been performed, the blower 3 and the fuel pump (not shown) are driven to start combustion in the burner 2.

  The combustion gas generated by the combustion of the burner 2 flows through the primary heat exchanger 7, passes through the primary heat exchanger 7, then flows through the secondary heat exchanger 9, and passes through the secondary heat exchanger 9. Thereafter, the heat is discharged from the exhaust port 10 to the outside of the latent heat recovery type hot water heater 1. Further, the water supplied from the water supply source, the water supplied from the water supply pipe 25 is led from the water supply pipe 25 to the secondary heat receiving pipe 8, and flows from the secondary heat receiving pipe 8 to the primary heat receiving pipe 6 in order, Heated by the heat exchange with the combustion gas in the secondary heat exchanger 9 and the primary heat exchanger 7 and led to the hot water supply pipe 26 from the primary heat receiving pipe 6 and adjusted to the hot water supply set temperature by adjusting the opening of the mixing valve 28. The temperature-controlled hot water is finally supplied from the hot water tap.

  At this time, in the secondary heat exchanger 9, the water flowing through the secondary heat receiving pipe 8 and the combustion gas are subjected to heat exchange, and the drain generated by the water vapor in the combustion gas being below the dew point is drain receiver 11 Collected into the neutralizer 13 through the drain introduction pipe 12, neutralized in the neutralizer 13, discharged to the outside of the neutralizer 13, and discharged into sewage at a predetermined location. It is.

  Here, the drain neutralization process in the neutralizer 13 will be described in detail. First, the on-off valve 24 provided in the drain drain pipe 23 is normally closed, and secondary heat is generated by combustion of the burner 2. The drain generated by the exchanger 9 is stored in the neutralizer 13 and is neutralized by the neutralizer. And if the water level of the drain in the neutralizer 13 becomes more than predetermined height, ie, the height of the lower end of a pair of water level detection electrode 14, a pair of water level detection electrode 14 will detect the water level of a drain, and the detection When the control unit 37 receives the signal, the control unit 37 opens the on-off valve 24 and starts draining the neutralized drain in the neutralizer 13.

  At this time, the drain drains a predetermined amount from the neutralizer 13, and when the certain amount is drained, the control means 37 controls to close the on-off valve 24 and stop draining the drain. It is. The constant amount may be the drain amount corresponding to the drain water level from the lower end of the discharge port 18 to the lower end of the water level detection electrode 14, or the time from opening the on-off valve 24 to closing it. Is set in advance, and the amount of drainage drained at that time may be determined in advance by experimentation, and it may be set to a constant amount. The drainage is performed per opening and closing until the on-off valve 24 is opened and closed. The amount of drain to be neutralized may be a certain amount set in advance. In the drain neutralization process, the on-off valve 24 is normally closed, so that the combustion gas generated in the combustion chamber 4 via the drain introduction pipe 12 when the drain is not sufficiently accumulated in the neutralizer 13. However, even if it proceeds into the neutralizer 13, the combustion gas does not leak from the drain drain pipe 23. Even when the latent heat recovery hot water heater 1 is installed indoors, the combustion gas leaks. There is nothing to worry about.

  The on-off valve 24 is not only opened when the pair of water level detection electrodes 14 described above detects the drain water level, but the on-off valve 24 counted by the first counter 38 is closed. The on-off valve 24 is also opened when the time reaches a predetermined time set in advance. At this time, if the drain level is higher than the discharge port 18 of the neutralizer 13, the drain is drained. is there.

  Next, opening / closing control of the opening / closing valve 24 will be described with reference to the flowchart shown in FIG. 2. First, when power is supplied to the latent heat recovery type hot water heater 1, the control means 37 opens and closes the opening / closing valve 24. The initialization process for moving the valve body of the on-off valve 24 to a predetermined initial position is executed (step S1). When the on-off valve 24 is closed in the initialization process, the first counter 38 starts counting (step S2). Then, it is determined whether the count time counted by the first counter 38 has reached a predetermined time (24 hours in this case) (step S3), and the count time counted by the first counter 38 is preset. If the predetermined time has not been reached, it is determined whether or not a detection signal is output from the water level detection electrode 14 (step S4), and the water level detection electrode When the detection signal is determined not to be output from the 4, in which the process returns to step S3.

  In the process of step S3, if the control unit 37 determines that the count time counted by the first counter 38 has reached a predetermined time set in advance, whether or not the combustion by the burner 2 is stopped. Is determined (step S5), and when it is determined that the combustion is stopped, the on-off valve 24 is opened (step S6). On the other hand, in the process of step S5, if the control means 37 determines that combustion by the burner 2 is being performed, the process returns to the process of step S4, and the count time counted by the first counter 38 is preset. When combustion by the burner 2 is performed when the predetermined time is reached, the process does not proceed to the step S6 for opening the on-off valve 24. However, when the count time counted by the first counter 38 reaches a predetermined time set in advance (YES in step S3) and combustion is being performed by the burner 2 (NO in step S5), the water level is detected. If a detection signal is output from the electrode 14 (YES in step S4), the on-off valve 24 is opened (step S6), and this case is excluded.

  In the process of step S6, when the control unit 37 opens the on-off valve 24, the count time of the first counter 38 is cleared to zero (step S7), and a predetermined time (here, the on-off valve 24 is opened). 2 minutes) has elapsed (step S8). If it is determined that a certain time has elapsed, the on-off valve 24 is closed (step S9), the process returns to step S2, and the first counter 38 counts again. Is to start.

  Regarding the opening / closing control of the opening / closing valve 24 in the first embodiment described above, the opening / closing valve 24 is opened when the water level detection electrode 14 detects a drain water level of a predetermined height or more, and the inside of the neutralizer 13. In the case of draining drained summed drain, the on-off valve 24 is opened when the count time of the first counter 38 reaches a predetermined time set in advance. Even if the drain water level in the sump 13 cannot be monitored, if it is determined that the closing time has reached a predetermined time based on the time during which the opening / closing valve 24 is closed, the opening / closing valve 24 is opened. Therefore, it is possible to prevent a situation in which drain is accumulated more than the volume of the neutralizer 13 while the on-off valve 24 is closed and the drain overflows from the neutralizer 13, and the neutralizer 13 It is possible to prevent a situation in which the combustion function is adversely affected by accumulation in the combustion gas flow path of the secondary heat exchanger 9 or the like through which the combustion gas communicating with the neutralizer 13 flows, assuming that the len does not overflow. It can be done. Further, when the count time of the first counter 38 reaches a predetermined time set in advance, the on-off valve 24 is opened, so that the soot caused by the combustion gas discharged from the neutralizer 13 together with the drain or the neutralizer It is possible to prevent sticking of the valve body of the on-off valve 24 due to impurities such as powder, shavings and dust.

  When the burner 2 is burning when the count time of the first counter 38 reaches a predetermined time, the control means 37 closes a hot water tap (not shown) provided at a predetermined location. The on-off valve 24 is opened after the flow rate sensor 30 detects a flow rate lower than the minimum operating flow rate and the combustion request is turned off, that is, after the combustion of the burner 2 is stopped. When the count time reaches a predetermined time, the amount of drain stored in the neutralizer 13 is small, and the communication portion 22 is sealed with drain and is not in a water-sealed state that can prevent passage of combustion gas. In addition, when the on-off valve 24 is opened, the combustion gas passes through the neutralizer 13 and is leaked to the outside from the drain drain pipe 23. If the latent heat recovery water heater 1 is installed indoors, Combustion gas is discharged indoors However, in this embodiment, when the burner 2 is combusted when the count time of the first counter 38 reaches a predetermined time, the control unit 37 opens and closes the open / close valve after the combustion of the burner 2 is stopped. Since 24 is opened, there is no fear that the combustion gas leaks to the outside through the neutralizer 13 communicating with the combustion gas flow path such as the heat exchanging portion 5 through which the combustion gas flows, and safety can be improved. Is.

  Furthermore, in the present embodiment, the predetermined time set in advance is 24 hours. However, the predetermined time is not limited to 24 hours, and the water level detection electrode is used under the condition that the maximum amount of drain is generated in the secondary heat exchanger 9. Even when the water level detection electrode 14 fails, such as when the predetermined time is set to a time shorter than the shortest time until the drain level 14 detects a drain water level of a predetermined height or higher, the drain does not overflow properly. The time during which the on-off valve 24 can be opened at the timing may be set as the predetermined time.

  Further, in the present embodiment, when the detection signal is output from the water level detection electrode 14 when the count time of the first counter 38 has not reached the predetermined time, the on-off valve 24 is opened and the first counter 38 Although the count time is cleared to zero, the opening / closing control of the opening / closing valve 24 when the water level detection electrode 14 detects the drain water level higher than a predetermined height and the control means 37 receives the detection signal. The opening / closing valve 24 opening / closing control based on the count time of the first counter 38 is a separate control, and the opening / closing control of the opening / closing valve 24 based on the counting time of the first counter 38 is excluding step S4 of the flowchart shown in FIG. The control shown in the flowchart of FIG. 3 may be used, and the same effect as that of the control shown in FIG. It becomes to achieve the. Note that the flowchart of FIG. 3 is almost the same as the flowchart of FIG. 2, and only the NO return position in step S3 and the NO return position in step S5 are changed, so the step number is not changed and almost no change is made in the contents. Because there is no explanation, it is omitted.

Next, a latent heat recovery type heat source machine according to a second embodiment of the present invention will be described with reference to FIG. 4. In this embodiment, the same parts as those in the first embodiment described above are denoted by the same reference numerals and described. Only a different configuration and operation will be described.
Reference numeral 39 denotes a second counter 39 which is provided in the control means 37 and counts and accumulates the time when the burner 2 is burning.

  Next, opening / closing control of the opening / closing valve 24 in the second embodiment will be described with reference to the flowchart shown in FIG. 5. First, when power is supplied to the latent heat recovery type hot water heater 1, the control means 37 Then, it is determined whether or not the combustion in the burner 2 has been started (step S10). If it is determined that the combustion in the burner 2 has been started, the second counter 39 starts counting (step S11) and accumulates the combustion time. Then, it is determined whether or not the count time (integrated combustion time) counted by the second counter 39 has reached a predetermined time (here, 2 hours) (step S12), and the second counter 39 counts. If the count time to be reached has not reached the preset time, it is determined whether combustion in the burner 2 has been stopped (step S13), and combustion in the burner 2 is If not stopped, the process returns to step S12. In step S12, NO is repeated in step S13, and NO is repeated in step S13. If it is determined in step S13 that combustion in the burner 2 is stopped, The second counter 39 stores the count time (integrated combustion time) (step S14), returns to the process of step S10, and when combustion is started next, the second counter 39 counts from the stored count time. It starts and accumulates combustion time.

  When the control means 37 determines in step 12 that the count time counted by the second counter 39 has reached a predetermined time set in advance, it determines whether or not the combustion in the burner 2 has been stopped ( If it is determined in step S15 that combustion in the burner 2 has been stopped, the on-off valve 24 is opened (step S16), the count time of the second counter 39 is cleared to zero (step S17), and the on-off valve 24 is opened. It is determined whether or not a certain time (2 minutes here) has elapsed (step S18). If it is determined that the certain time has elapsed, the on-off valve 24 is closed (step S19), and the processing returns to step S10. When combustion in the burner 2 is started, the second counter 39 starts counting again.

  Regarding the opening / closing control of the opening / closing valve 24 in the second embodiment described above, when the counting time (integrated combustion time) of the second counter 39 that counts and integrates the combustion time reaches a preset predetermined time, the opening / closing valve 24. Even if the water level detection electrode 14 fails and the drain water level in the neutralizer 13 cannot be monitored, the on-off valve is based on the combustion time correlated with the amount of drain generated. 24 can be opened at an appropriate timing, so that it is possible to prevent a situation in which drain is accumulated beyond the volume of the neutralizer 13 and the drain overflows from the neutralizer 13 while the on-off valve 24 is closed. It is possible that the drainage does not overflow from the neutralizer 13, and that the combustion gas communicating with the neutralizer 13 is accumulated in the combustion gas flow path of the secondary heat exchanger 9 or the like. One in which it is possible to prevent a situation such as that adversely affect the burn function. Further, when the count time of the second counter 39 reaches a predetermined time set in advance, the on-off valve 24 is opened, so that the soot caused by the combustion gas discharged from the neutralizer 13 together with the drain or the neutralizer It is possible to prevent sticking of the valve body of the on-off valve 24 due to impurities such as powder, shavings and dust.

  When the burner 2 is combusted when the count time of the second counter 39 reaches a predetermined time, the control means 37 closes a hot water tap (not shown) provided at a predetermined location. After the flow rate sensor 30 detects a flow rate lower than the minimum operating flow rate and the combustion request is turned off, that is, after the combustion of the burner 2 is stopped, the on-off valve 24 is opened. The water in the neutralizer 13 is drained for the purpose of preventing freezing of the drain in the neutralizer 13, and when the count time of the second counter 39 reaches a predetermined time on that day, the neutralizer 13 When the on-off valve 24 is opened when the storage amount of the internal drain is small and the communication portion 22 is sealed with drain and is not in a water-sealed state capable of preventing the passage of the combustion gas, Drain through the sump 13 If the latent heat recovery water heater 1 is installed indoors because it is leaked to the outside from the water pipe 23, there is a risk that combustion gas may be discharged indoors. In this embodiment, the count time of the second counter 39 When the burner 2 is combusted when the time reaches the predetermined time, the control means 37 opens the on-off valve 24 after the combustion of the burner 2 is stopped. Thus, there is no fear that the combustion gas leaks to the outside through the neutralizer 13 communicating with the combustion gas flow path 5 or the like, and safety can be improved.

  Further, in the present embodiment, the predetermined time set in advance is 2 hours, but is not limited to 2 hours, and the water level detection electrode is used under the condition that the maximum amount of drain is generated in the secondary heat exchanger 9. Even when the water level detection electrode 14 fails, such as when the predetermined time is set to a time shorter than the shortest time until the drain level 14 detects a drain water level of a predetermined height or higher, the drain does not overflow properly. The time during which the on-off valve 24 can be opened at the timing may be set as the predetermined time.

  In the present embodiment, the on / off valve 24 is controlled to open and close based on the count time of the second counter 39. However, as in the first embodiment described above, the water level detection electrode 14 is set to a predetermined value. The drain water level higher than the height may be detected and the detection signal may be entangled with the control for opening / closing the on-off valve 24 when the control means 37 receives it. In this case, the count time of the second counter 39 is set to a predetermined time. When a detection signal is output from the water level detection electrode 14 before reaching, the on-off valve 24 may be opened and the count time of the second counter 39 may be cleared to zero. Even if it is deformed, the same effect as that of the control shown in FIG. Of course, the control for opening / closing the opening / closing valve 24 based on the count time of the second counter 39 and the control for opening / closing the opening / closing valve 24 based on the detection signal of the water level detection electrode 14 may be performed independently.

  In addition, this invention is not limited to 1st Embodiment and 2nd Embodiment which were demonstrated previously, In 1st Embodiment and 2nd Embodiment, the latent heat recovery type water heater 1 is made into the example. As described above, the present invention may be applied to a latent heat recovery type hot water heating apparatus having a heat radiation terminal such as a floor heating panel or a panel convector and capable of performing heating operation by circulating hot water heated by a burner. .

DESCRIPTION OF SYMBOLS 1 Latent heat recovery type water heater 2 Burner 5 Heat exchange part 13 Neutralizer 14 Water level detection electrode 17 Inlet 18 Outlet 23 Drain drain pipe 24 On-off valve 37 Control means 38 First counter (time measuring means)
39 Second counter (time measuring means)

Claims (4)

  A burner that burns fuel, a heat exchange part that generates drainage when combustion gas generated by combustion in the burner becomes a dew point or less due to heat exchange with a heated fluid, and a heat exchange part that is generated in the heat exchange part A neutralizer having a neutralizer for neutralizing the drain and having an inlet for introducing the drain generated in the heat exchange section and an outlet for discharging the drain after neutralization; A water level detecting means for detecting the water level of the drain stored in the sump, a drain drain pipe connected to the discharge port of the neutralizer, an opening / closing means for opening and closing the drain drain pipe, and the drain water level being predetermined. A latent heat recovery type comprising a control means for controlling the drainage neutralized from the neutralizer by opening the opening and closing means when the water level detection means detects that the water level has been exceeded. It is a heat source machine. Timer means for cement provided, said control means, latent heat recovery type heat source machine, characterized in that the count time of the clock means is adapted to open said opening and closing means If preset reached a predetermined time.   The latent heat recovery type heat source machine according to claim 1, wherein the time counting means counts time when the opening / closing means is closed.   2. The latent heat recovery type heat source machine according to claim 1, wherein the time counting means counts the combustion time of the burner.   When the burner is being burned when the count time of the timing means reaches the predetermined time, the control means opens the opening / closing means after the burner has stopped burning. The latent heat recovery type heat source device according to any one of claims 1 to 3.

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