JP2019032137A - Heat source machine - Google Patents

Abstract

To provide a heat source machine which prevents generation of a siphon phenomenon and can maintain a water seal state in a neutralizer.SOLUTION: A heat source machine includes: a combustor 2; heat exchangers 5, 6 heating fluid to be heated by performing heat recovery from combustion gas generated by the combustor 2; a neutralizer 20 which has an inlet 22 and an outlet 23 for drain, flows acid drain generated as the heat recovery is performed to the inside through the inlet 22, neutralizes the drain and drains it through the outlet 23; an on-off valve 50 which is provided for a discharge route of the drain connected to the outlet 23 of the neutralizer 20; water level detection means which detects that the water level of the drain stored in the neutralizer 20 is a water level where the inside of the neutralizer 20 is in a water seal state and is lower than a lowermost part of the outlet 23 and equal to or higher than the prescribed water level; and valve control means performing control so as to open the on-off valve 50 when water level detection means turns to a detection state from a non-detection state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat source device including a neutralizer for neutralizing acidic drain (condensed water) generated when heat is recovered from combustion gas.

  In the conventional heat source machine, in order to improve heat exchange efficiency, a primary heat exchanger that recovers sensible heat from the combustion gas generated by burner combustion, and a latent heat from the combustion gas that has passed through the primary heat exchanger are recovered. There exists a thing of the structure which has a secondary heat exchanger and the neutralizer which neutralizes the acidic drain which generate | occur | produces with this secondary heat exchanger.

  In such a heat source machine, in order to prevent combustion gas from passing through the neutralizer and leaking to the outside, there is one configured to realize a water-sealed state in the neutralizer (for example, Patent Document 1). 2).

  In Patent Documents 1 and 2, the neutralizer is provided with an introduction port through which drain flows in at the top, and a discharge port through which the drain neutralized in the neutralizer is discharged at the side. . A drain drain pipe is connected to the discharge port, and an open / close valve is provided in the drain drain pipe, and after the drain is sufficiently stored in the neutralizer to be in a water-sealed state, the open / close valve is opened. .

JP 2017-3137 A JP 2017-3138 A

  When a large amount of drain is stored in the neutralizer in the heat source device including the neutralizer as described above, if the on-off valve is opened, the drain in the neutralizer is exhausted vigorously and siphon phenomenon occurs. This may cause water seal breakage.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a heat source apparatus that can prevent the occurrence of siphon phenomenon and maintain the water-sealed state in the neutralizer.

  In order to achieve the above object, a heat source apparatus according to an aspect of the present invention includes a combustor and a heat exchanger that heats a fluid to be heated by recovering heat from the combustion gas generated by the combustor. In addition, the drain having an inlet and an outlet for draining, and the acidic drain generated by the heat recovery is allowed to flow from the inlet to neutralize the drain, and then discharged from the outlet. A neutralizer, an on-off valve provided in a drain discharge path connected to the discharge port of the neutralizer, and a drain water level stored in the neutralizer. A water level detection means for detecting that the water level is in a state and is equal to or higher than a predetermined water level lower than the lowermost part of the discharge port; and when the water level detection means changes from a non-detection state to a detection state, Valve control means for controlling to open, and Eteiru.

  According to this configuration, the water level detection means is a predetermined level in which the water level of the drain stored in the neutralizer is a water level where the neutralizer is in a water-sealed state and is lower than the lowest part of the discharge port. Since it is detected that the water level is higher than the water level, when the drain water level rises and the water level detection means changes from the non-detection state to the detection state and the on-off valve is opened, the drain water level is the highest at the outlet. The water level is lower than the bottom. Therefore, when the on-off valve is opened, the drain is not discharged from the discharge port, and after that, when the amount of drain storage in the neutralizer increases and the drain water level is above the lowest part of the discharge port, Drain is discharged from the discharge port and discharged to the outside through the discharge route. Thus, since drain is not exhausted from the neutralizer vigorously when the on-off valve is opened, the siphon phenomenon does not occur and the water seal state in the neutralizer can be maintained.

  The valve control means may control to close the on-off valve when the water level detection means changes from a detection state to a non-detection state.

  According to this configuration, even if a water seal breakage in the neutralizer occurs by closing the on-off valve when the water level of the drain in the neutralizer falls and the water level detection means changes from the detection state to the non-detection state. Leakage of combustion gas to the outside can be prevented. In addition, when the water level detection means is in a non-detection state (when the on-off valve is closed), the drain water level in the neutralizer is lower than the lowermost part of the discharge port (below the predetermined water level). Until then, the drain in the discharge path has been discharged to the outside, and no drain remains in the discharge path, so that it is possible to prevent the drain from freezing in the discharge path due to low temperatures in winter.

  A temperature at which a circulating flow path for circulating the heated fluid heated by the heat exchanger is circulated between an external heating terminal and the heat exchanger, and the temperature of the heated fluid flowing into the heat exchanger is detected. Combustion of the combustor so that the temperature of the heated fluid detected by the temperature sensor when the sensor and the water level detection means are in the non-detection state is a predetermined temperature that is likely to generate drainage. Temperature control means for controlling at least one of the amount and the flow rate of the fluid to be heated circulating in the circulation channel may be further provided.

  The heat source device having such a configuration is a heat source device for heating, and when the water level detection means is in the non-detection state, the temperature of the heated fluid flowing into the heat exchanger detected by the temperature sensor generates the drain. By increasing the amount of drain generated, the neutralizer is quickly put into a water-sealed state or a water-seal detection state, or the water-seal breakage in the neutralizer is prevented. can do.

  The water level detection means has a pair of electrodes that are disposed apart from each other in the horizontal direction in the neutralizer and extend in the vertical direction, and a detection state is obtained by immersing both lower ends of the pair of electrodes in the drain. You may be comprised so that it may become.

  According to this configuration, electrodes having the same configuration can be used for the pair of electrodes.

  The present invention has the above-described configuration, and has an effect that it is possible to provide a heat source device that can prevent the occurrence of a siphon phenomenon and maintain a water-sealed state in the neutralizer.

Drawing 1 is a mimetic diagram showing a schematic structure of a heat source machine of an example of an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a specific example of the neutralizer and the buffer tank. FIG. 3 is a flowchart showing an example of the operation of the heat source machine.

  Hereinafter, preferred embodiments will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted. Further, the present invention is not limited to the following embodiment.

(Embodiment)
Drawing 1 is a mimetic diagram showing a schematic structure of a heat source machine of an example of an embodiment of the present invention. The heat source device 1 includes a heat source device main body in which various components and the like are provided inside the housing 1a, and a remote controller 61. The heat source device 1 is connected to a heating terminal 70. As the heating terminal 70, a floor heating panel, a fan convector or the like is used.

  The heat source unit 1 includes a combustor 2 composed of a burner that burns fuel (oil, gas, etc.), a blower 3 that supplies combustion air to the combustor 2, and a combustion chamber 4. The heat exchanger (the primary heat exchanger 5 and the secondary heat exchanger 6) arrange | positioned, the neutralizer 20, the control apparatus 60, etc. are provided.

  The primary heat exchanger 5 collects sensible heat from the combustion gas generated by the combustion of the combustor 2 and heats circulating water (heated fluid) such as water flowing through the primary heat receiving pipe 5a. The secondary heat exchanger 6 collects latent heat from the combustion gas that has passed through the primary heat exchanger 5 and heats the circulating water flowing through the secondary heat receiving pipe 6a. The combustion gas that has passed through the primary heat exchanger 5 and the secondary heat exchanger 6 in this order is exhausted to the outside through the exhaust port 16.

  The primary heat receiving pipe 5 a of the primary heat exchanger 5 and the secondary heat receiving pipe 6 a of the secondary heat exchanger 6 are connected by a connecting pipe 7. In addition, one end of the heating forward pipe 8 is connected to the outlet side end of the primary heat receiving pipe 5 a, and the incoming side end of the heating terminal 70 is connected to the other end of the heating forward pipe 8 via the external pipe 71. Further, one end of the heating return pipe 9 is connected to the water inlet side end of the secondary heat receiving pipe 6a, and the water outlet side end of the heating terminal 70 is connected to the other end of the heating return pipe 9 via the external pipe 72. . The heating terminal 70, the external pipes 71 and 72, the heating return pipe 9, the secondary heat receiving pipe 6a, the connecting pipe 7, the primary heat receiving pipe 5a, and the heating forward pipe 8 form a circulation passage 10 through which circulating water circulates. ing.

  The heating return pipe 9 is provided with a circulation pump 11 and a heating tank 12. The circulation pump 11 is a pump for circulating the circulating water in the circulation channel 10. The heating tank 12 is a tank for absorbing volume fluctuation due to a temperature change of circulating water circulating in the circulation flow path 10. An expansion tank 13 is connected to the heating tank 12. The expansion tank 13 absorbs the overflow from the heating tank 12 when the circulating water becomes hot and expands in volume, and conversely, the circulating water is supplied to the heating tank 12 when the circulating water becomes low in volume and contracts. It is configured to replenish.

  The heating forward pipe 8 is provided with a temperature sensor T1 for detecting the temperature of the circulating water in the forward pipe 8. The heating return pipe 9 is provided with a temperature sensor T2 for detecting the temperature of the circulating water in the return pipe 9. Is provided.

  Below the secondary heat exchanger 6, a drain receiving portion 14 that collects acidic drain (condensate) W generated in the secondary heat exchanger 6 is provided. An upper end of the drain introduction pipe 15 is connected to the drain receiving portion 14, and a lower end of the drain introduction pipe 15 is connected to the inlet 22 of the neutralizer 20. A buffer tank 30 is provided at the discharge port 23 of the neutralizer 20. Then, one end of a drain drain pipe 33 is connected to the discharge port 32 of the buffer tank 30. An on-off valve 50 comprising a two-way valve (open or closed switching valve) is provided in the middle or the other end of the drain drain pipe 33. The drain W collected by the drain receiver 14 flows into the neutralizer 20 from the inlet 22 through the drain introduction pipe 15, is neutralized in the neutralizer 20, and is discharged from the outlet 23. The drain W discharged from the discharge port 23 is discharged to the outside through the drain discharge path (the buffer tank 30 and the drain drain pipe 33) when the on-off valve 50 is in the open state.

FIG. 2 is a longitudinal sectional view showing a specific example of the neutralizer 20 and the buffer tank 30.
The neutralizer 20 includes a hollow container 21. The container 21 is formed by, for example, blow molding. In FIG. 2, the right end of the container 21 is a buffer tank 30, and in this example, the neutralizer 20 and the buffer tank 30 are integrally configured.

  The neutralizer 20 is provided with partition walls 21a to 21c inside the container 21, and the partition walls 21a and 21b are provided with flow openings 28a and 28b each having a slit-like opening. By the partition walls 21a to 21c, the neutralizer 20 is partitioned into a water level detection chamber 24 that does not contain the neutralizing agent N and a neutralization chamber 25 that is filled with the neutralizing agent N. A flow path of the drain W passing through the port 28a is provided as indicated by an arrow. The other through-flow port 28b is provided above the through-flow port 28a as a spare passage when the one through-flow port 28a is clogged.

  A buffer tank 30 is provided in the downstream direction of the neutralization chamber 25 (the right end in the figure), and the neutralization chamber 25 and the buffer tank 30 communicate with each other via a discharge port 23 formed of a slit-shaped opening. When viewed from the direction of the arrow 80, the discharge port 23 is an opening elongated in the vertical direction. Further, the flow openings 28a, 28b between the water level detection chamber 24 and the neutralization chamber 25 are elongated in the left-right direction in FIG. 2 when viewed from above. Each of the discharge port 23 and the flow ports 28a and 28b is formed of a narrow slit-shaped opening through which the massive neutralizing agent N cannot pass, and the massive neutralizing agent N does not exit from the neutralization chamber 25. .

  An opening / closing lid 27 for allowing the neutralizing agent N to enter the neutralization chamber 25 is provided on the upper portion of the container 21. In addition, a drainage part 29 is provided at the lower left part of the container 21 to be used for draining the drain in the neutralizer 20 during maintenance.

  The drain W that has flowed into the water level detection chamber 24 from the inlet 22 of the neutralizer 20 normally flows out from the water level detection chamber 24 to the neutralization chamber 25 through the inlet 28a, as indicated by the arrows, 25 through the drainage pipe 33 through the drainage pipe 33 from the buffer tank 30 when the on-off valve 50 is in the open state. It is designed to be discharged outside. The interior 31 of the buffer tank 30 has a volume that can store a certain amount of drain W.

  The neutralizer 20 has a water seal structure in which the lowermost portion 23a of the discharge port 23 is located above the lower end portion of the partition wall 21c. In this water-sealed structure, the drain W accumulates inside the container 21 and becomes a higher water level than the lower end of the partition wall 21c, so that the combustion gas that has flowed into the water level detection chamber 24 together with the drain W flows into the flow inlet 28a, This is for blocking water from passing through the neutralization chamber 25 through 28 b and sealing with water so as not to be discharged to the outside of the neutralizer 20. That is, the drain W accumulated in the neutralization chamber 25 becomes a higher water level than the lower end portion of the partition wall 21c, so that the combustion gas does not flow from the neutralizer 20 to the buffer tank 30 and is in a water-sealed state.

  In the water level detection chamber 24, the lower part of the inlet 22 into which the drain W flows is a foreign substance storage part 24a. A state in which the upper wall 26 of the water level detection chamber 24, the overflow electrode 40 for detecting a rise in the water level when the inside of the container 21 is clogged, and the inside of the neutralizer 20 are sealed (water-sealed state) ) Is provided. One overflow electrode 40 is provided, and a pair of water seal electrodes 45 are provided side by side in the direction orthogonal to the paper surface of FIG. 2, and the arrangement of the overflow electrode 40 and the water seal electrode 45 is an example. The pair of water-sealed electrodes 45 only need to be arranged apart from each other in the horizontal direction. For example, the pair of water-sealed electrodes 45 may be arranged side by side in the left-right direction as shown in FIG.

  The pair of water-sealed electrodes 45 is configured such that a water-sealed state is detected by energizing between the pair of water-sealed electrodes 45 when both lower end portions 46 are immersed in the drain W. That is, the water level at which the drain W in the neutralizer 20 reaches the lower end 46 of the water seal electrode 45 is the water seal detection water level (predetermined water level) M.

  Since the water seal detection water level M is higher than the lowest water level (the lower end portion of the partition wall 21c) in which the neutralizer 20 is in a water seal state, the water seal detection water level M is in a water seal state by the pair of water seal electrodes 45. Is detected, that is, when the water level of the drain W in the neutralizer 20 is equal to or higher than the water seal detection water level M, the inside of the neutralizer 20 is surely in a water seal state.

  Further, both lower ends 46 of the pair of water-sealed electrodes 45 are positioned below the horizontal plane L passing through the lowermost portion 23a of the discharge port 23 of the neutralizer 20 by a predetermined distance G. That is, the lowermost portion 23a of the discharge port 23 is positioned above the water seal detection water level M, which is detected as being in a water sealed state by the pair of water sealed electrodes 45, by a predetermined distance G. Thereby, the water level of the drain W accumulated in the neutralizer 20 rises, and when the water-sealed state is detected by the pair of water-sealed electrodes 45 (detection start time), the drain W is discharged to the outlet. 23 is a state in which it does not flow out from the buffer tank 30.

  Note that, for example, a predetermined voltage is constantly applied to the pair of water sealed electrodes 45 from a predetermined power source (not shown) provided in the housing 1 a, and energization between the pair of water sealed electrodes 45 is performed. The detection part (energization detection part) which detects this is provided. Here, when the drain W in the neutralizer 20 becomes a water level equal to or higher than the water seal detection water level M, the current between the pair of water seal electrodes 45 is energized, and an energization detection signal indicating that energization is detected is output from the energization detection unit. And input to the control device 60. On the other hand, when the drain W in the neutralizer 20 is a water level lower than the water seal detection water level M, the pair of water seal electrodes 45 is not energized, and no energization detection signal is output from the energization detection unit. An energization detection signal is not input. Here, a water level detection means is comprised by a pair of water seal electrode 45, an electricity supply detection part, etc. FIG. In addition, you may be comprised so that the electricity supply detection part may be included in the control apparatus 60. FIG.

  In this example, the pair of water-sealed electrodes 45 have the same length that is long in the vertical direction, and are arranged so that both lower end portions 46 are at the same height level. Thereby, the thing of the same structure can be used as a pair of water-sealed electrodes 45.

  The control device 60 includes a CPU, a ROM, a RAM, and the like, and includes, for example, a microcontroller. A signal path for controlling the combustor 2, the blower 3, the circulation pump 11, the on-off valve 50, and the like is connected to the control device 60. The control device 60 is connected to a signal path for inputting the above-described energization detection signal and output signals such as the temperature sensors T1 and T2. In the control device 60, for example, the CPU can execute various controls of the heat source unit 1 by reading out and executing a control program stored in the ROM into the RAM, and also functions as a valve control unit, a temperature control unit, and the like. The control device 60 may be configured by a single control device that performs centralized control, or may be configured by a plurality of control devices that perform distributed control in cooperation with each other.

  The control device 60 is communicably connected to the remote controller 61, and exchanges information with each other. The remote controller 61 is for the user to operate the heat source unit 1, etc., and an operation switch for instructing the start or stop of the heating operation and a temperature setting switch for setting the temperature of the circulating water sent to the heating terminal 70 And a display unit for displaying the temperature set by the temperature setting switch.

  Next, an example of the operation of the heat source device 1 will be described. FIG. 3 is a flowchart showing an example of the operation of the heat source device 1. This operation is realized by the control of the control device 60.

  First, when the user operates the operation switch of the remote controller 61 to instruct the start of the heating operation, the operation start instruction is input to the control device 60 (step S1). Note that before the operation is started (when the operation is stopped), the on-off valve 50 is controlled to be closed.

  When the operation start instruction is input, control device 60 determines whether or not it is in a water seal detection state (step S2). In this step S2, the control device 60 determines that the water seal detection state is in effect when the energization detection signal is input from the above-described energization detection unit (that is, when the energization detection unit is in the detection state). When the detection signal is not input (that is, when the energization detection unit is in the non-detection state), it is determined that the state is not the water seal detection state (the same applies to steps S4 and S7 described later).

  If the water seal detection state is not reached in step S2, the control device 60 starts the drain increase operation and continues the drain increase operation until the water seal detection state is reached (steps S3 and S4). The drain increasing operation will be described later.

  When it is determined in step S2 or step S4 that the water seal is detected, the control device 60 opens the on-off valve 50 (step S5) and starts normal operation (step S6). Then, it is determined whether or not the water seal is detected even during normal operation (step S7), and the normal operation is continued while the water seal is detected (steps S6 and S7). On the other hand, if the water seal detection state disappears during normal operation, the on-off valve 50 is closed (step S8), the flow returns to step S3, and the drain increase operation is started.

  In step S7, the determination that the water seal detection state when the on-off valve 50 is closed is that the energization detection signal from the energization detection unit is not continuously input for a predetermined time (for example, 1 minute). It may be set as a condition. Thereby, it can avoid that the opening / closing valve 50 will be in an unstable state by the water surface height of the drain W in the container 21 swinging, and that the drain increase operation and the normal operation are repeated in a short time.

  When performing normal operation (normal heating operation), the control device 60 operates the combustor 2, the blower 3, and the circulation pump 11. Then, during normal operation, the combustion amount of the combustor 2 (including adjustment by intermittent combustion) is appropriately adjusted so that the room temperature to be heated becomes a temperature around the heating set temperature set by the operation unit of the remote controller 61. I have control. During operation, the circulation pump 11 is always driven regardless of whether the combustion of the combustor 2 is being performed or the combustion of the combustor 2 is stopped, and circulating water is supplied to the heating terminal 70. It is continuously circulated. The drain generated in the secondary heat exchanger 6 is collected by the drain receiver 14 and flows into the neutralizer 20 through the drain introduction pipe 15.

  In this normal heating operation, the temperature of the incoming water to the secondary heat exchanger 6 (the temperature of the circulating water flowing into the secondary heat receiving pipe 6a) increases as the temperature of the room in which the heating terminal 70 is installed increases. And when the temperature of the incoming water to the secondary heat exchanger 6 becomes a high temperature, for example, exceeding a predetermined temperature Ts described later, it becomes a state where the drain hardly occurs or does not occur. When the heating operation is continued in such a state, it is conceivable that the drain in the neutralizer 20 is heated by the combustion gas flowing into the neutralizer 20 and the drain evaporates. Therefore, at the time of use such as immediately after installation of the heat source device 1 or immediately after draining the neutralizer 20, the inside of the neutralizer 20 is unlikely to be in a water seal state or a water seal detection state.

  On the other hand, by performing the drain increasing operation, drain is easily generated, and the amount of drain generated can be increased. When this drain increasing operation is performed, the control device 60 operates the combustor 2, the blower 3, and the circulation pump 11, and the temperature of the water entering the secondary heat exchanger 6 measured by the temperature sensor T2 is generated by the drain. Adjustment of the combustion amount of the combustor 2 (in other words, adjustment of the calorific value per unit time so as to be a predetermined temperature Ts (for example, a predetermined temperature of 45 ° C. or less)) that is set as an easy temperature is intermittent. And / or adjusting the flow rate of the circulation pump 11 to perform the heating operation. The predetermined temperature Ts is a value obtained by experiments or the like.

  Although it is not always necessary to perform the drain increase operation, the drain increase operation can be performed to increase the amount of drain generated and quickly bring the neutralizer 20 into a water seal state or a water seal detection state. Therefore, it is possible to avoid the on / off valve 50 from being closed due to the on / off valve 50 being kept closed. Further, it is possible to prevent water seal destruction in the neutralizer 20 due to drain evaporation or the like.

  In the present embodiment, the water level of the drain stored in the neutralizer 20 is a water level at which the inside of the neutralizer 20 is in a water-sealed state, and the water-seal detected water level is lower than the lowermost portion 23 a of the discharge port 23. Since the on-off valve 50 is opened when it is detected that it is equal to or higher than M, the drain water level is lower than the lowermost portion 23 a of the discharge port 23 when the drain water level rises and the on-off valve 50 is opened. The water level. Therefore, when the on-off valve 50 is opened, the drain is not discharged from the discharge port 23, and thereafter, the amount of drain stored in the neutralizer 20 increases and the drain water level becomes the lowest part of the discharge port 23. If it becomes more than 23a, drain will be discharged | emitted from the discharge port 23, and will be discharged | emitted outside through the discharge path (the buffer tank 30 and the drain drain pipe 33). Thus, since drain is not exhausted from the neutralizer 20 vigorously when the on-off valve 50 is opened, the siphon phenomenon does not occur and the water seal state in the neutralizer 20 is maintained. Can do.

  Further, when the water level of the drain in the neutralizer 20 falls and becomes less than the water seal detection water level M, the on-off valve 50 is closed, so that even if the water seal breakage in the neutralizer 20 occurs, the combustion gas to the outside Leakage can be prevented. Further, when the on-off valve 50 is closed, the drain level in the neutralizer 20 is lower than the lowest level 23a of the discharge port 23, and the discharge path (the buffer tank 30 and the drain drain pipe) is reached by then. The drain in 33) is discharged to the outside, and the drain does not remain in the discharge path. Therefore, it is possible to prevent the drain from freezing in the discharge path due to a low temperature in winter.

  In the present embodiment, the heating source device 1 for heating to which the heating terminal 70 is connected has been described as an example. However, the present invention can also be applied to a heat source unit for hot water supply and the like. In the case of a heat source device for hot water supply, for example, a water inlet pipe connected to the water inlet side end of the secondary heat exchanger 6 (secondary heat receiving pipe 6a) and tap water from the outside, and a primary heat exchanger 5 A hot water pipe connected to the outlet side end of the (primary heat receiving pipe 5a), a bypass pipe connecting the water inlet pipe and the hot water pipe to supply a part of tap water entering the water inlet pipe to the hot water pipe, It has a flow rate adjusting valve for adjusting the flow rate passing through the bypass pipe, a flow rate sensor provided in the water inlet pipe, an incoming water temperature sensor for detecting the temperature of the water flowing into the secondary heat exchanger 6, and the like. The hot water outlet pipe is connected to a hot water tap such as a curan through an external pipe.

  In this case, when the hot-water tap is opened and the incoming water flow rate to the incoming water pipe detected by the flow rate sensor is equal to or higher than the minimum operating flow rate, the control device 60 performs the hot water supply operation and operates the combustor 2 and the blower 3. Then, based on the temperature of the water flowing into the secondary heat exchanger 6 detected by the incoming water temperature sensor, combustion is performed so that the temperature of the hot water flowing out from the primary heat exchanger 5 to the outlet pipe becomes a predetermined temperature. The amount of combustion of the vessel 2 is controlled. And the hot water which flowed out from the primary heat exchanger 5 to the hot water pipe, and the water which branched and entered into the hot water pipe through the bypass pipe are mixed and temperature-controlled, so that hot water at the set hot water temperature flows out from the hot water tap. The In the case of a heat source device for hot water supply, the drain increase operation described in the heat source device 1 for heating is not performed.

  In the case of a heat source device for hot water supply, the fluid to be heated is water such as tap water. However, in the case of the heat source device 1 for heating as shown in FIG. 1, for example, the fluid to be heated (circulated water) is limited to water. Alternatively, antifreeze or the like may be used.

  From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

  INDUSTRIAL APPLICABILITY The present invention is useful as a heat source machine or the like that can prevent the occurrence of siphon phenomenon and keep the water seal state in the neutralizer.

DESCRIPTION OF SYMBOLS 1 Heat source machine 2 Combustor 5 Primary heat exchanger 6 Secondary heat exchanger 10 Circulation flow path 11 Circulation pump 20 Neutralizer 22 Inlet 23 Outlet 23a Bottom of the outlet 30 Buffer tank 33 Drain drain pipe 45 Water seal Electrode 50 On-off valve 60 Control device 70 Heating terminal T1, T2 Temperature sensor

Claims (4)

A combustor,
A heat exchanger for heating the fluid to be heated by recovering heat from the combustion gas generated by the combustor;
A drain having an inlet and an outlet, and the acidic drain generated by the heat recovery is allowed to flow from the inlet to neutralize the drain and then discharged from the outlet. A Japanese machine,
An on-off valve provided in a drain discharge path connected to the discharge port of the neutralizer;
It is detected that the water level of the drain stored in the neutralizer is a water level at which the inside of the neutralizer is in a water-sealed state and is equal to or higher than a predetermined water level lower than the lowest part of the discharge port. Water level detection means;
Valve control means for controlling the opening / closing valve to open when the water level detection means is in a detection state from a non-detection state;
Heat source machine equipped with. The valve control means includes
When the water level detection means changes from a detection state to a non-detection state, it controls to close the on-off valve,
The heat source machine according to claim 1. A circulation flow path for circulating a heated fluid heated by the heat exchanger between an external heating terminal and the heat exchanger is formed,
A temperature sensor for detecting the temperature of the heated fluid flowing into the heat exchanger;
The combustion amount of the combustor and the temperature of the heated fluid detected by the temperature sensor when the water level detection unit is in the non-detection state are set to a predetermined temperature that is predetermined as a temperature at which drainage is likely to occur. Temperature control means for controlling at least one of the flow rates of the fluid to be heated circulating in the circulation channel;
The heat source machine according to claim 1 or 2, further comprising: The water level detecting means is
The neutralizer has a pair of electrodes that are arranged apart from each other in the horizontal direction and extend in the vertical direction, and is configured to be in a detection state by immersing both lower ends of the pair of electrodes in the drain,
The heat source machine in any one of Claims 1-3.

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