JP2015218997A - Heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source machine capable of forcibly discharging drainage and being miniaturized.SOLUTION: A heat source machine includes an ejector 50. The ejector 50 discharges drainage to the external of the heat source machine from a neutralizer. The ejector 50 includes a first piping portion 51 for introducing hot water/water to the ejector 50, a second piping portion 52 for discharging the hot water/water from the ejector 50, and a third piping portion 53 connected between the first and second piping portions 51, 52, and also connected to the neutralizer. The first piping portion 51 has a throttle portion 50a at an upstream side with respect to a connecting portion CP with the third piping portion 53.

Description

  The present invention relates to a heat source machine, and more particularly to a heat source machine capable of recovering the latent heat of combustion gas.

  Conventionally, in a heat source device (latent heat recovery type heat source device) capable of recovering the latent heat of combustion gas, the drain generated in the secondary heat exchanger is neutralized by the neutralizer and then discharged outside the heat source device. At this time, the drain is discharged out of the heat source apparatus by the drain head pressure in the drain reservoir, or is discharged out of the heat source apparatus by a dedicated pump for discharging the drain. For example, Japanese Patent Laying-Open No. 2005-127648 (Patent Document 1) discloses a hot water device in which drain is discharged by the water head pressure of the drain in the drain reservoir.

JP 2005-127648 A

  As described in the above publication, when drain is discharged due to the water head pressure of the drain in the drain reservoir, there is a problem that the drain is insufficiently discharged because the drain is not forcibly discharged. Further, when the drain is discharged by a dedicated pump for discharging the drain, there is a problem that the heat source machine becomes large because the pump has a movable portion.

  This invention is made | formed in view of the said subject, The objective is to provide the heat-source machine which can discharge drain forcibly and can be reduced in size.

  The heat source apparatus of the present invention can recover the latent heat of the combustion gas. The heat source device includes a combustion unit, a heat exchanger, a drain storage unit, and an ejector. The combustion section is for supplying combustion gas. The heat exchanger is for recovering the latent heat of the combustion gas supplied by the combustion section. The drain storage part is for storing the drain generated by recovering the latent heat of the combustion gas in the heat exchanger. The ejector is for discharging drain from the drain storage part to the outside of the heat source unit. The ejector is connected between the first piping part for introducing hot water into the ejector, the second piping part for discharging hot water from the ejector, and the first and second piping parts, and has a drain storage. 3rd piping part connected to the part. The first piping part has a throttle part on the upstream side of the connection part with the third piping part.

  According to the heat source apparatus of the present invention, hot water introduced from the first piping part is discharged from the second piping part through the throttle part. At this time, negative pressure is generated by hot water flowing through the throttle portion. Due to this negative pressure, drain is drawn from the third piping section. This drain is discharged from the second piping part together with the hot water introduced from the first piping part. For this reason, the drain can be forcibly discharged by the negative pressure. And since an ejector does not have a movable part, it can reduce in size. For this reason, a heat source machine can be reduced in size.

  The heat source device further includes a backflow prevention valve disposed between the drain storage portion and the ejector. The backflow prevention valve is configured to allow the inflow of drain from the drain reservoir to the ejector and prohibit the inflow of drain from the ejector to the drain reservoir. For this reason, it is possible to prevent the backflow of drain from the ejector to the drain storage portion by the backflow prevention valve.

  Said heat-source machine can be connected to a bathtub. The heat source device further includes a water flow circuit to which tap water is supplied. The water flow circuit includes a valve and first and second circuits branched by the valve. The first circuit is connected to the ejector and the second circuit is connected to the bathtub. For this reason, a negative pressure can be generated in the ejector by the water pressure of tap water. Since the water pressure of the tap water is larger than the water pressure by the pump, the negative pressure can be reliably generated in the ejector by the water pressure of the tap water.

  In the above heat source machine, the water flow circuit includes a flow rate detection sensor capable of detecting the flow rate of water injected into the bathtub, and a flow rate control valve capable of controlling the flow rate of water injected into the bathtub based on the flow rate of water injected detected by the flow rate detection sensor. And further. The flow rate control valve is arranged on the upstream side of the valve and is configured to be able to supply hot water to the valve. For this reason, the hot water flowing through the water flow circuit can be maintained at a predetermined flow rate. Thereby, the water pressure of the hot water flowing through the water flow circuit can be maintained at a predetermined pressure.

  In the above heat source machine, the water flow circuit is configured to be able to supply hot water heated by the heat exchanger to the ejector. For this reason, by supplying hot water heated by the heat exchanger to the ejector, freezing of the drain discharge path on the downstream side of the ejector can be suppressed.

  As described above, according to the present invention, it is possible to provide a heat source device capable of forcibly discharging drain and reducing the size.

It is an operation principle figure showing roughly composition of a heat source machine in one embodiment of the present invention. It is sectional drawing which shows schematically the structure of the ejector in one embodiment of this invention. It is a perspective view which shows roughly the structure of the ejector of the modification in one embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the structure of the heat source machine of one embodiment of the present invention will be described. The heat source device of the present embodiment is a latent heat recovery type heat source device capable of recovering the latent heat of the combustion gas. Moreover, the heat source machine is comprised so that connection to a bathtub is possible.

  With reference to FIG. 1, the schematic structure of the heat source machine (hot-water heater) 1 of this Embodiment is demonstrated. The heat source device 1 of the present embodiment has two independent combustion systems. Specifically, the heat source unit 1 has a hot water supply side combustion system on the right side and a bath / heating side combustion system on the left side. Furthermore, the heat source device 1 has a control device 2 that controls operations related to combustion.

  In the hot water supply side combustion system, a hot water supply side combustion unit 7 that burns fuel to generate combustion gas, a known blower 9 that blows combustion air to the hot water supply side combustion unit 7, and hot water or a heat medium are circulated. A hot water supply side heat exchanging portion 11 heated by the combustion gas and a hot water running water system 20 are provided. Similarly, the bath / heating-side combustion system includes a bath / heating-side combustion unit 8, a blower 9 that blows air to the bath / heating-side combustion unit 8, a bath / heating-side heat exchange unit 12, and a heating / flowing water system 21. And a re-running water system 22. The heat source machine 1 has a drain discharge system 13 that receives drains from both the bath / heating combustion system and the hot water supply combustion system.

  Each of the hot water supply side combustion section 7 and the bath / heating side combustion section 8 is provided with a plurality of combustion sections 40 that combust fuel gas, and a fuel pipe 41 that leads the fuel gas to the combustion section 40 is connected. This is for supplying combustion gas to the combustion section 40. The fuel pipe 41 is provided with an original gas solenoid valve (fuel valve) 42, a proportional valve (fuel valve) 43 and a solenoid valve (fuel valve) 44 that regulate the flow of fuel gas to the respective combustion units 40. It has been. That is, in each of the hot water supply side combustion section 7 and the bath / heating side combustion section 8, the fuel valves 42, 43, 44 are controlled to be opened and closed, and the fuel gas supplied through the fuel pipe 41 is converted into the combustion section. Combusted at 40 to produce combustion gas. Each of the hot water supply side combustion section 7 and the bath / heating side combustion section 8 is provided with an overheat prevention device (fuse) HD. The overheat prevention device HD operates when the temperature of each of the hot water supply side combustion unit 7 and the bath / heating side combustion unit 8 becomes abnormally high, and shuts off the electric circuit connected to the control device 2.

  The hot water supply water system 20 is partly formed by the hot water supply side heat exchange unit 11, and the hot water supplied from the water supply source flows to the hot water supply side heat exchange unit 11, and the hot water supply side heat exchange unit 11 performs a curan or the like. And a hot water supply side bypass flow path 25 that bypasses the hot water supply side heat exchange section 11. The hot-water supply water system 20 includes a hot-water supply-side bypass flow rate adjustment valve (liquid valve) 26 that adjusts the flow rate that passes through the hot-water supply side bypass passage 25, and a water amount adjustment valve (liquid valve) 27 that adjusts the hot water flow rate. And an incoming flow rate sensor IS for detecting the incoming flow rate of the water supplied from the water source, a temperature sensor (thermistor) TS for detecting the temperature of the water supplied from the water source (incoming water temperature), and the like. In addition, the heat source device 1 includes a number of temperature sensors. These temperature sensors are electrically connected to the control device 2, and a temperature signal detected by the temperature sensor is input to the control device 2.

  Furthermore, the hot-water supply water system 20 is provided with a bath dropping channel 28 that branches from the water amount adjustment valve 27 and guides the hot water to the bath tub 60. The bath dropping channel 28 includes a pouring electromagnetic valve (liquid valve) 30 that regulates the water flow to the bathtub 60, a backflow prevention mechanism 31 that prevents a backflow of water flow from the bathtub side, and the bathtub 60. A hot water amount sensor WS for detecting the flow rate of hot water or water to be dropped (a pouring flow rate), a three-way valve TV, and the like are provided.

  The flow rate of hot water supplied to the bathtub 60 via the hot water solenoid valve 30 is adjusted by the water amount adjusting valve 27. The flow rate of hot water supplied to the bathtub 60 via the pouring electromagnetic valve 30 is measured by the pouring water amount sensor WS. For this reason, the hot water flowing through the bath dropping channel 28 can be kept at a predetermined flow rate by adjusting the water amount adjusting valve 27 and the hot water solenoid valve 30 while the flow rate of hot water is measured by the hot water amount sensor WS. Thereby, the water pressure of the hot water flowing through the bath dropping channel 28 can be maintained at a predetermined pressure. The hot water is prevented from flowing back upstream from the backflow prevention mechanism 31 by the backflow prevention mechanism 31 disposed downstream of the pouring electromagnetic valve 30 in the bath dropping channel 28.

  The backflow prevention mechanism 31 has a backflow prevention valve FV and check valves RV1 and RV2. The backflow prevention valve FV normally closes the overflow port due to a pressure difference between the supply water source pressure (primary pressure) and the supply destination pressure (secondary pressure). The backflow prevention valve FV is connected to the water supply port through the pipe SP in order to introduce the primary pressure, and is connected to the pouring electromagnetic valve 30 through the check valve RV1 in order to introduce the secondary pressure. The check valve FV is connected to the three-way valve TV through the check valve RV2.

  Further, the backflow prevention valve FV opens when negative pressure is generated on the water supply source side due to water breakage or the like, and discharges miscellaneous water from the overflow port to the outside of the heat source unit 1, and the overflow port is connected to the heat source unit 1 through the pipe OP. Connected to the overflow drain.

  The hot water supply side heat exchanging section 11 includes a primary heat exchanger 11a for recovering sensible heat of the combustion gas and a secondary heat exchanger 11b for recovering the latent heat of the combustion gas.

  The hot water flow system 20 constitutes a water flow circuit WC. The water flow circuit WC is supplied with tap water from the water supply port. The water pressure of tap water is generally larger than the water pressure by the pump in the heat source unit 1. The water flow circuit WC includes a three-way valve (valve) TV, and a first circuit C1 and a second circuit C2 branched by the three-way valve TV. The first circuit C1 is connected to the ejector 50. The second circuit C <b> 2 is connected to the bathtub 60 via the heating running water system 21.

  The water flow circuit WC controls the water injection flow rate to the bathtub 60 based on the water injection flow amount sensor (flow rate detection sensor) WS capable of detecting the water injection flow rate to the bathtub 60 and the water injection flow rate detected by the water injection water amount sensor WS. A possible water amount adjustment valve (flow control valve) 27 is included. The water amount adjusting valve 27 is arranged on the upstream side of the three-way valve TV, and is configured to be able to supply hot water to the three-way valve TV.

  The water flow circuit WC is configured to be able to supply hot water heated by the hot water supply side heat exchange unit 11 to the ejector 50.

  The heat source apparatus 1 according to the present embodiment includes a number of freeze prevention heaters FH. These freeze prevention heaters FH are installed in the hot water supply water system 20 or the like, and the freeze prevention heaters FH prevent freezing of the liquid inside the hot water supply water system 20 or the like.

  The heating / flowing water system (terminal circulation path) 21 is formed by the bath / heating-side heat exchange unit 12, and hot water is a high-temperature side terminal such as the bath / heating-side heat exchange unit 12 and a bathroom heater. A high-temperature terminal path 32 that circulates between (not shown), a low-temperature terminal path 33 that circulates between the bath / heating-side heat exchanger 12 and a low-temperature side terminal (not shown) such as floor heating, and a high-temperature terminal A heating-side bypass flow path 34 that connects the path 32 and the low temperature terminal path 33 and a bath heating path 35 that heats hot water flowing through the reheating water system 22 are circulated.

  And in the heating running water system 21, the heating side pump 36 which forms the circulating flow of hot water, the expansion tank 37 which suppresses the pressure rise accompanying the expansion of the volume resulting from the temperature change of hot water, or the pressure drop accompanying shrinkage, A header thermal valve (liquid valve) 38 that feeds hot water toward the low temperature side terminal, a heating side bypass thermal valve (liquid valve) 39 provided on the heating side bypass flow path 34, and a bath heating path 35 There are provided a liquid / liquid heat exchanger 46 for performing heat exchange between the bath-side thermal valve (liquid valve) 45 that regulates the flow of water to the hot water flowing through the reheating water system 22. The expansion tank 37 is provided with a water supplement control valve SV for controlling the start / stop of the water supplement to the expansion tank 37.

  The bath / heating-side heat exchanger 12 includes a primary heat exchanger 12a for recovering the sensible heat of the combustion gas and a secondary heat exchanger 12b for recovering the latent heat of the combustion gas. .

  In the reheating water system 22, the liquid / liquid heat exchanger 46 forms a part thereof, and hot water in the bathtub 60 circulates between the liquid / liquid heat exchanger 46 and the bath tub 60. A soaking channel 47 is provided. In the reheating channel 47, a reheating side pump 48 that forms a circulating flow of hot water, a water flow switch FS that detects the presence or absence of a water flow in the reheating channel 47, and the hot water level in the bathtub 60 are provided. A water level sensor HS or the like for detection is provided. Note that a bath dropping channel 28 is connected to the reheating channel 47.

  The drain discharge system 13 is a flow path that drains the drain generated when recovering the latent heat of the combustion gas with the neutralizer (drain storage unit) 14 and then drains the drain to the outside. That is, as shown in FIG. 5, the drain discharge system 13 includes combustion gas in the neutralizer introduction flow path 15 extending from the secondary heat exchangers 11 b and 12 b to the neutralizer 14 and the secondary heat exchangers 11 b and 12 b. It comprises a neutralizer 14 for storing the drain generated by recovering the latent heat and an external discharge passage 16 downstream from the neutralizer 14.

  The external discharge flow path 16 includes an ejector 50, a backflow prevention valve 54, and a discharge pipe 55. A backflow prevention valve 54 is disposed upstream of the drain discharge system 13 of the ejector 50. That is, the backflow prevention valve 54 is disposed between the neutralizer 14 and the ejector 50. The backflow prevention valve 54 is configured to allow the inflow of drain from the neutralizer 14 to the ejector 50 and prohibit the inflow of drain from the ejector 50 to the neutralizer 14.

  Further, a discharge pipe 55 is disposed on the downstream side of the drain discharge system 13 of the ejector 50. Drain is discharged out of the heat source unit 1 from the discharge pipe 55.

  Referring to FIG. 2, the ejector 50 includes a first piping part 51, a second piping part 52, and a third piping part 53. The first piping part 51 is for introducing hot water into the ejector 50. The 1st piping part 51 is connected to the upstream of the water flow circuit WC. The first piping unit 51 is connected to the first circuit C1.

  The second piping part 52 is for discharging hot water from the ejector 50. The 2nd piping part 52 is connected to the downstream of the water flow circuit WC. The second piping part 52 is connected to the discharge pipe 55.

  The third piping unit 53 is connected between the first piping unit 51 and the second piping unit 52. The third piping part 53 is connected to the neutralizer 14. The first piping part 51 has a throttle part 50 a on the upstream side of the connection part CP with the third piping part 53. The throttle portion 50a has a tapered shape, and is configured such that the inner diameter decreases toward the downstream. The throttle portion 50a is configured such that the inner diameter decreases toward the second piping portion 52 side.

  For this reason, in the ejector 50, negative pressure is generated by the hot water flowing through the throttle portion 50 a from the first piping portion 51 toward the second piping portion 52. With this negative pressure, drain is drawn into the ejector 50 from the third piping portion 53. The drain drawn into the ejector 50 flows out of the ejector 50 together with hot water.

Then, with reference to FIG. 1, the fundamental operation | movement of the heat-source equipment 1 of this Embodiment is demonstrated.
The basic operation of the heat source device 1 includes a hot water supply operation, a heating operation, a bath drop-in operation, and a chasing operation, all of which are the same as known ones.

  In the hot water supply operation, if a calorie or the like is operated and there is a hot water discharge request, the hot water supply side heat exchange unit 11 is heated by the combustion gas generated in the hot water supply side combustion unit 7 and hot water at a desired temperature is discharged from the curan or the like. The Heating operation is based on the high temperature heating operation that circulates hot water in the bathroom heating of the bath (high temperature side terminal) and the temperature of the low temperature hot water (hot water that circulates in the high temperature side terminal). There is also a low-temperature heating operation that circulates low temperature). That is, in the high-temperature heating operation, the bath / heating-side heat exchange unit 12 is heated by the combustion gas generated in the bath / heating-side combustion unit 8, and high-temperature hot water is circulated to the high-temperature side terminal via the high-temperature terminal path 32. In the low-temperature heating operation, the bath / heating-side heat exchange unit 12 is heated by the combustion gas generated in the bath / heating-side combustion unit 8, and low-temperature hot water is circulated to the low-temperature side terminal via the low-temperature terminal path 33. Is done.

  In the reheating operation, if the temperature of the hot water in the bathtub is lower than a predetermined temperature or if there is a request for reheating operation by a remote controller or the like, the hot water in the bathtub is set to the set temperature via the liquid / liquid heat exchanger 46. Heat until. More specifically, in the reheating operation of the present embodiment, the bath / heating-side heat exchange unit 12 is heated by the combustion gas generated in the bath / heating-side combustion unit 8, and the heat flows through the heating / running water system 21. Indirectly, the water is transferred to the reheating channel 47 and the hot water in the bathtub 60 is heated. The bath drop-in operation is different only in the method of requesting hot water (request via a remote controller or the like), and an operation substantially similar to the hot-water supply operation is performed, and thus the description thereof is omitted.

Next, the drain discharging operation will be described with reference to FIGS. 1 and 2.
When the high water level electrode H is turned on when the high water level electrode H inserted into the neutralizer 14 is conducted to the drain, the three-way valve TV is switched to the first circuit C1 which is a drain drainage path. Then, the pouring solenoid valve 30 is opened. At this time, the flow rate of hot water is kept at a predetermined flow rate by the water amount adjusting valve 27 and the poured water amount sensor WS. As hot water flows from the first piping part 51 to the second piping part 52, a negative pressure is generated in the throttle part 50a. Due to this negative pressure, the drain in the neutralizer 14 is drawn into the third piping portion 53. This drain is discharged out of the ejector 50 together with hot water. When the drain is discharged from the neutralizer 14 and the low water level electrode L inserted in the neutralizer 14 is not conducted to the drain so that the low water level electrode L is turned off, the three-way valve TV is a bath circuit. It is switched to the second circuit C2. Then, the pouring electromagnetic valve 30 is closed.

Next, an ejector 50 according to a modification of the present embodiment will be described with reference to FIG.
In the ejector 50 of the modified example, the first piping part 51 extends in the axial direction of the ejector 50, and the second piping part 52 and the third piping part 53 extend linearly in a direction intersecting the axial direction. Yes. Further, the ejector 50 has a fourth piping portion 56 that intersects the axial direction and communicates with the first piping portion 51. The ejector 50 is connected to a motor 70, and by this motor 70, the ejector 50 is configured to rotate in the circumferential direction around the axial direction.

  In the state shown in FIG. 3, the second piping part 52 communicates with the discharge pipe 55, and the third piping part 53 communicates with the external discharge channel 16. For this reason, the hot water flowing into the ejector 50 from the first piping part 51 through the bath dropping channel 28 flows from the second piping part 52 to the discharge pipe 55 through the throttle part 50a. The drain in the external discharge flow channel 16 is drawn into the ejector 50 from the third piping part 53 by the negative pressure generated by the hot water flowing through the throttle part 50a.

  When the ejector 50 rotates about 90 degrees in the circumferential direction around the axial direction from the state shown in FIG. 3, the fourth piping section 56 communicates with the bath circuit. For this reason, the hot water flowing into the ejector 50 from the first piping part 51 through the bath dropping channel 28 flows into the bath circuit through the fourth piping part 56.

  In this state, the second piping part 52 does not communicate with the discharge pipe 55, and the third piping part 53 does not communicate with the external discharge channel 16. For this reason, hot water and drain do not flow to the discharge pipe 55 through the second pipe portion 52.

  In the ejector 50 of the modification, the discharge of hot water and drain to the discharge pipe 55 and the discharge of hot water to the bottom pipe can be switched by rotating the ejector 50 in the circumferential direction around the axial direction. For this reason, if the ejector 50 of a modification is used, the three-way valve TV of said embodiment will become unnecessary.

Next, the effect of the heat source machine of this Embodiment is demonstrated.
According to the heat source apparatus 1 of the present embodiment, the hot water introduced from the first piping part 51 is discharged from the second piping part 52 through the throttle part 50a. At this time, negative pressure is generated by hot water flowing through the throttle portion 50a. Due to this negative pressure, drain is drawn from the third piping part 53. This drain is discharged from the second piping unit 52 together with the hot water introduced from the first piping unit 51. For this reason, the drain can be forcibly discharged by the negative pressure. And since the ejector 50 does not have a movable part, it can reduce in size. For this reason, the heat source machine 1 can be reduced in size. Moreover, the production cost of the heat source device 1 can be reduced.

  In the heat source device 1 of the present embodiment, the backflow prevention valve 54 can prevent the drain from flowing back from the ejector 50 to the neutralizer. For example, when the discharge pipe 55 is installed at a position higher than the neutralizer 14, the backflow prevention valve 54 can prevent the remaining water in the discharge pipe 55 from flowing back to the neutralizer 14. Further, when the negative pressure is not generated in the ejector 50 because the hot water flowing into the ejector 50 does not reach a predetermined flow rate, the backflow prevention valve 54 can prevent the drain from flowing back to the neutralizer 14.

  In the heat source device 1 of the present embodiment, since tap water is supplied to the water flow circuit WC, a negative pressure can be generated in the ejector 50 by the water pressure of the tap water. Since the water pressure of the tap water is higher than the water pressure by the pump, the negative pressure can be reliably generated in the ejector 50 by the water pressure of the tap water. Moreover, even if the neutralizing material accommodated in the neutralizer 14 decreases and the neutralization performance becomes insufficient, the risk of strong acid is reduced by diluting the drain with tap water.

  In the heat source unit 1 of the present embodiment, the hot water flowing through the water flow circuit WC can be maintained at a predetermined flow rate by the pouring water amount sensor (flow rate detection sensor) WS and the water amount adjustment valve (flow rate control valve) 27. Thereby, the water pressure of the hot water flowing through the water flow circuit WC can be maintained at a predetermined pressure.

  In the heat source device of the present embodiment, freezing of the drain discharge path on the downstream side of the ejector 50 can be suppressed by supplying hot water heated by the secondary heat exchanger 11b to the ejector 50.

  In the heat source device of the present embodiment, cold water may flow through the ejector 50. The hot water heated by the ejector 50 may be allowed to flow only when the temperature thermistor for preventing freezing is equal to or lower than a predetermined temperature.

  In addition, although the neutralizer 14 was demonstrated as an example of the drain storage part of the heat source apparatus of this Embodiment above, the drain storage part of this Embodiment is not limited to the neutralizer 14, It is a drain tank etc. There may be.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Heat source machine, 2 Control apparatus, 7 Hot water supply side combustion part, 8 Heating side combustion part, 9 Blower, 11 Hot water supply side heat exchange part, 11a, 12a Primary heat exchanger, 11b, 12b Secondary heat exchanger, 12 Heating side Heat exchanger, 13 Drain discharge system, 14 Neutralizer, 15 Neutralizer introduction flow path, 16 External discharge flow path, 20 Hot water flow system, 21 Heating flow system, 22 Reheating water system, 23 Hot water main flow path, 25 Hot water supply side bypass flow path, 27 Water volume adjustment valve, 28 Bath drop-in flow path, 30 Pouring solenoid valve, 31 Backflow prevention mechanism, 32 High temperature terminal path, 33 Low temperature terminal path, 34 Heating side bypass flow path, 35 Bath heating path, 36 Heating side pump, 37 Expansion tank, 40 Combustion part, 41 Fuel piping, 42 Fuel valve, 46 Liquid / liquid heat exchanger, 47 Reheating channel, 48 Reheating side pump, 50d Jector, 50a Restriction part, 51 1st piping part, 52 2nd piping part, 53 3rd piping part, 54 Backflow prevention valve, 55 Discharge pipe, 56 4th piping part, 60 Bathtub, 70 Motor, C1 1st circuit, C2 2nd circuit, FH freeze prevention heater, FS water flow switch, FV backflow prevention valve, H high water level electrode, HD overheat prevention device, IS water flow sensor, L low water level electrode, OP, SP piping, RV1, RV2 Check valve, SV supplementary water control valve, TV three-way valve, WC water flow circuit, WS hot water quantity sensor.

Claims (5)

A heat source machine capable of recovering the latent heat of combustion gas,
A combustion section for supplying the combustion gas;
A heat exchanger for recovering latent heat of the combustion gas supplied by the combustion unit;
A drain storage section for storing drain generated by recovering the latent heat of the combustion gas in the heat exchanger;
An ejector for discharging the drain from the drain reservoir to the outside of the heat source machine,
The ejector is
A first piping part for introducing hot water into the ejector;
A second piping part for discharging hot water from the ejector;
A third piping part connected between the first and second piping parts and connected to the drain storage part,
The first piping unit is a heat source machine having a throttle unit on the upstream side of a connection unit with the third piping unit. A backflow prevention valve disposed between the drain reservoir and the ejector;
The said backflow prevention valve is comprised so that the inflow of the said drain from the said drain storage part to the said ejector may be permitted, and the inflow of the said drain from the said ejector to the said drain storage part may be prohibited. Heat source machine. Can be connected to the bathtub,
It further includes a water flow circuit to which tap water is supplied,
The water flow circuit includes a valve and first and second circuits branched by the valve;
The first circuit is connected to the first piping section;
The heat source machine according to claim 1 or 2, wherein the second circuit is connected to the bathtub. The water flow circuit is
A flow rate detection sensor capable of detecting the flow rate of water injected into the bathtub;
A flow control valve capable of controlling the water injection flow rate to the bathtub based on the water injection flow rate detected by the flow detection sensor;
The heat source device according to claim 3, wherein the flow control valve is arranged upstream of the valve and configured to be able to supply hot water to the valve.   The heat source apparatus according to claim 3 or 4, wherein the water flow circuit is configured to be able to supply hot water heated by the heat exchanger to the ejector.

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