JP5999420B2 - Heat source machine - Google Patents

Description

  The present invention relates to a heat source device, and more particularly, to a device provided with discharge means for discharging condensed water generated by a heat exchanger.

  2. Description of the Related Art A heat source apparatus that has a combustion chamber that contains a combustion burner and that ignites and burns the burner while supplying combustion air from the outside into the combustion chamber is widely known. Such a heat source machine includes a multi-function type capable of dropping a hot water into a bathtub, chasing a bath, heating a floor, and the like.

  In recent years, a latent heat recovery type heat source apparatus that recovers not only sensible heat of combustion gas but also latent heat has been widely used in the market in order to improve the heat exchange efficiency of heat generated when a combustion operation is performed by a burner. This latent heat recovery type heat source machine is equipped with a secondary heat exchanger that recovers latent heat in addition to a primary heat exchanger that mainly recovers sensible heat of combustion gas, and has high heat exchange efficiency. .

  In such a heat source machine, the combustion gas generated by carrying out the combustion operation with the burner is introduced into the secondary heat exchanger to recover the latent heat, so the water vapor in the combustion gas introduced into the secondary heat exchanger is recovered. Becomes liquefied at low temperature and drainage is generated. The generated drain is exposed to the combustion gas and takes in nitrogen oxides (NOx) and sulfur oxides (SOx) from the combustion gas, and thus exhibits strong acidity. That is, in such a latent heat recovery type heat source machine, drainage that exhibits strong acidity is generated structurally.

  There is a concern that this acidic drain may have an adverse effect on the environment and the like if drained to the outside without being treated. Therefore, some latent heat recovery type heat source machines are provided with a drain discharge system that guides the drain to the outside, and a neutralization device for neutralizing acidic drain in the middle of the drain discharge system. In this type of heat source machine, the drain generated in the secondary heat exchanger is neutralized by the neutralizer and then drained to the outside, so that it does not adversely affect the environment and the like.

  As this type of heat source machine, there is a heat source machine (heating device) disclosed in Patent Document 1. The heat source device disclosed in Patent Document 1 includes a neutralization device for neutralizing drain, a drain storage tank for storing the neutralized drain, and a drain discharge pump. Then, the neutralized drain is stored in the drain storage tank, and on the condition that the liquid level (water level) of the drain storage tank has reached a certain level or more, the drain discharge pump is driven to the drain storage tank. The stored drain is discharged to the outside.

  In the heat source device disclosed in Patent Document 1, the condensed water (drain) discharging operation for discharging the drain to the outside is performed on the condition that the burner performs the combustion operation. As a result, it is possible to prevent generation of pump drive noise and drain discharge sound when the burner combustion operation is stopped. In other words, when the heat source machine generates pump drive noise or drain discharge sound even though the burner has stopped burning, it may cause discomfort to the user or the user may malfunction the heat source machine. There is a risk of misunderstanding that it may have been. Therefore, the burner performs a drain discharge operation in parallel with the combustion operation, and the drive sound of the pump is mixed with the combustion sound of the burner, so that the user does not have such discomfort and suspicion. Yes.

JP 2007-71420 A

In recent years, the diversification of houses and buildings has progressed, and the installation environment of heat source machines has also diversified accordingly. Due to the diversification of the installation environment, it may not be possible to provide a dedicated pipe for drain discharge when the heat source device is installed. That is, there are cases where piping used only for the drain discharge operation cannot be provided due to restrictions in the installation environment. In this case, piping may be shared by drain discharge operation and other operations, for example, pouring operation into a bathtub. That is, when the drain discharge operation is performed, the pipe used for flowing the drain may be used as the pipe for flowing hot water for filling the hot water when performing the pouring operation to the bathtub.
Specifically, the drain discharge operation is changed to another operation (for example, a pouring operation to a bathtub), such as a cleaning operation for cleaning the pipe after the drain discharge operation and then a pouring operation. The piping is shared so as not to affect.

  However, according to such a configuration, there is a problem that another operation that shares the piping cannot be performed while the drain discharge operation is being performed. In other words, while the drain discharge operation is being performed, the piping used in other operations is used to discharge the drain, and thus other operations cannot be performed. Therefore, even if the user tries to perform another operation (for example, a pouring operation to the bathtub), the user must wait until the drain discharge operation is completed. If a desired operation is repeated after waiting for a predetermined time, some users may feel uncomfortable.

  Therefore, in view of the above-described problems of the prior art, the present invention has a feeling of discomfort resulting from the fact that the desired operation is not performed quickly even when the user's desired operation and the drain discharge operation share the pipe. It is an object to provide a heat source machine that is not given to a user.

  The invention described in claim 1 for solving the above problem is generated by a burner that burns fuel to generate combustion gas, a heat exchanger that mainly recovers the latent heat of the combustion gas, and the heat exchanger. It has a storage means for storing drain, and a drain discharge means for performing a drain discharge operation for discharging the drain stored in the storage means to the outside, and the storage means detects the liquid level inside A storage side detection means capable of detecting the presence or absence of drain at a predetermined position on the upstream side of the drain direction of the storage means. Even if the means detects a liquid level above a predetermined level, it is possible to perform an operation that does not start the drain discharge operation until the upstream side detection means detects that the drain has reached a predetermined position. With heat source machine That.

The heat source device of the present invention has a storage means for storing drain generated in the heat exchanger, and a storage-side detection means capable of detecting an internal liquid level is provided in the storage means. Furthermore, upstream detection means capable of detecting the presence or absence of drain at a predetermined position is provided upstream of the storage means in the direction of drain flow. And even if the storage-side detection means detects a liquid level above a predetermined level, an operation that does not start the drain discharge operation for discharging the drain to the outside until the upstream-side detection means detects that the drain has reached the predetermined position This is possible.
In other words, in the heat source device of the present invention, even when the liquid level higher than a predetermined level is detected by the storage unit that stores the drain and it is preferable that the drain is discharged to the outside, the drain is determined further upstream of the storage unit. The drain discharge operation is not started until it is detected that the position has been reached. In this way, it is possible to delay the drain discharge in a situation where it is preferable to discharge the drain to the outside, and to perform other operations such as a pouring operation to the bathtub during that time. For this reason, it is not necessary to wait for the operation desired by the user in order to perform the drain discharge operation, and the operation desired by the user can be performed quickly, so that the user is not uncomfortable.

Here, a case will be considered in which the drain is not discharged to the outside even though a certain amount or more of the drain is stored in the storage unit and it is preferable to discharge the drain to the outside. In this case, since the drain does not flow from the storage unit to the downstream side in the drain flow direction, the liquid level of the storage unit increases and the storage unit is filled with drain. Even in this state, if the drain is not discharged to the outside, the drain is accumulated in the portion located on the upstream side in the drain flow direction from the storage means. That is, the drain that cannot flow into the storage means because the storage means is saturated will accumulate upstream from the storage means. Therefore, if the state in which the drain is not discharged to the outside is continued, there may be a problem that the drain overflows from a series of paths for discharging the drain.
Therefore, in the heat source apparatus of the present invention, when it is detected that the drain has reached a predetermined position on the upstream side of the storage means, the drain discharge operation is started. That is, when the occurrence of a malfunction is predicted by not discharging the drain, the drain discharging operation is started. Accordingly, as described above, even when the drain discharge is delayed in a situation where it is preferable to discharge the drain to the outside, it is possible to prevent the occurrence of problems due to the drain not being discharged.

  The invention described in claim 2 is a dropping path for carrying out a dropping operation in which hot water heated by the heat exchanger is poured into the bathtub, and the bathtub again after taking out the hot water from the bathtub and passing through the heat exchanger A bath circulation path for carrying out the reheating operation to be returned to each has a bath use detection means capable of detecting whether or not the drop operation or the reheating operation is performed, respectively, While the dropping operation or the chasing operation is being performed, the drain discharge operation is not started even when the storage side detection means detects a liquid level higher than a predetermined level, and the dropping operation or the chasing operation is performed. 2. The heat source apparatus according to claim 1, wherein the drain discharge operation is started on the condition that the burning operation is finished.

In such a configuration, during the dropping operation for pouring hot water into the bathtub or the reheating operation for heating the hot water after taking out the hot water from the bathtub and returning it to the bathtub again, the storage means for storing drainage is used to store a predetermined amount or more of liquid. Even when the position is detected and it is preferable to discharge the drain to the outside, the drain discharge operation is not started. Then, the drain discharge operation is started on the condition that the dropping operation or the chasing operation is finished.
That is, in the heat source device of the present invention, while performing the operation for using the bath such as the drop operation and the reheating operation, the operation for using the bath is performed with priority over the drain discharge operation. . As a result, the user does not have to wait for the operation for using the bath for the drain discharge operation, and the bath can be used comfortably, so that the user is not uncomfortable.

  By the way, normally, when a liquid level higher than a predetermined level is detected by the storage means for storing the drain, it is preferable to discharge the drain to the outside. That is, it is more preferable that the drain is discharged to the outside as soon as possible without being stored more than necessary. As a result, it is possible to more reliably prevent the occurrence of a problem that the drain overflows from a series of paths for discharging the drain.

  The invention according to claim 3 provided on the basis of such knowledge is that the storage-side detection means detects a liquid level of a predetermined level or more while the dropping operation or the reheating operation is not performed. 3. The heat source apparatus according to claim 2, wherein the drain discharge operation is started.

  In such a configuration, when the operation for using the bath is not performed, that is, when it is predicted that the user does not feel uncomfortable without delaying the drain discharge operation, the drain is quickly turned on. It is configured to discharge.

  According to a fourth aspect of the present invention, when the dropping operation or the chasing operation is performed, and the storage side detection means detects a liquid level higher than a predetermined level, the upstream detection means 4. The heat source device according to claim 2, wherein the drain discharge operation is started by interrupting the standby of the drain discharge operation on condition that it has reached a predetermined position. 5.

  In such a configuration, even when the dropping operation or the reheating operation is performed and the drain discharge operation is on standby, the storage side detection means detects a liquid level above a predetermined level, and the upstream side detection means When it is detected that the drain has reached the predetermined position, the drain discharge operation is suspended and the drain discharge operation is started. That is, in the heat source device of the present invention, even when the drain discharge operation is delayed, if the occurrence of a malfunction due to not discharging the drain is predicted, the drain discharge operation is given priority. As a result, it is possible to prevent the occurrence of problems caused by not draining the drain.

The invention related to the present invention is a burner that burns fuel to generate combustion gas, a heat exchanger that mainly recovers the latent heat of the combustion gas, and a storage means for storing drain generated in the heat exchanger. And a drain discharge means for performing a drain discharge operation for discharging the drain stored in the storage means to the outside, and the storage means has a first detection means capable of detecting an internal liquid level; A second detection means capable of detecting a liquid level higher than the first detection means, and the second detection means even when the first detection means detects a liquid level higher than a predetermined level. The heat source device is characterized in that an operation that does not start the drain discharge operation is possible until it is detected that the drain has reached a predetermined position.

In the heat source apparatus according to the invention related to the present invention, even in a situation where it is preferable that the storage means for storing the drain detects the liquid level above a predetermined level by the first detection means and discharges the drain to the outside. The drain discharge operation is not started until a liquid level higher than the liquid level detected by the first detection means is detected by the two detection means. In this way, it is possible to delay the drain discharge in a situation where it is preferable to discharge the drain to the outside, and to perform other operations such as a pouring operation to the bathtub during that time. For this reason, it is not necessary to wait for the operation desired by the user in order to perform the drain discharge operation, and the operation desired by the user can be performed quickly, so that the user is not uncomfortable.

Further, in the heat source apparatus of the invention related to the present invention, when the liquid level higher than the liquid level detected by the first detection means is detected by the second detection means, the drain discharge operation is started. That is, when the occurrence of a malfunction is predicted by not discharging the drain, the drain discharging operation is started. Accordingly, as described above, even when the drain discharge is delayed in a situation where it is preferable to discharge the drain to the outside, it is possible to prevent the occurrence of problems due to the drain not being discharged.

  The heat source apparatus of the present invention can perform a user-desired operation such as a pouring operation to the bathtub while delaying the drain discharge, so that the user waits for the drain discharge operation. It will not be. For this reason, the user does not feel uncomfortable because the desired operation is not performed promptly.

It is an operation principle figure showing a heat source machine concerning an embodiment of the present invention. It is a flowchart which shows the procedure of the drain discharge operation | movement which the heat-source equipment of FIG. 1 implements.

  Hereinafter, although the heat source apparatus 1 concerning embodiment of this invention is demonstrated in detail, this invention is not limited to these examples.

As shown in FIG. 1, the heat source unit 1 includes a combustion unit 3 inside the housing 2, a blower 4 that supplies combustion air to the combustion unit 3, and a primary heat exchanger 5 that mainly recovers sensible heat. And a so-called latent heat recovery type comprising a secondary heat exchanger 6 (heat exchanger) that mainly recovers latent heat.
The heat source device 1 includes a control device 7, and the control device 7 can receive signals from various sensors in the heat source device 1. Moreover, when this control apparatus 7 transmits an operation command to each part of the heat source unit 1, the heat source unit 1 can perform various operations.

  The heat source device 1 includes a hot water supply system 10, a bath dropping system 11, and a bath system 12. Here, in the hot water supply system 10, a general hot water supply operation in which hot water is discharged from the hot water tap 15 can be performed. In the bath dropping system 11, a dropping operation in which hot water is poured into the bathtub 16 can be performed. Furthermore, in the bath system 12, it is possible to perform a reheating operation in which hot water in the bathtub 16 is circulated and heated appropriately.

  The combustion unit 3 is configured to generate high-temperature combustion gas by burning fuel such as gas supplied from the outside by the burner 3a.

  The blower 4 incorporates a motor and an impeller (not shown) inside, and can change the number of rotations according to the combustion state of the burner 3a of the combustion unit 3 to adjust the blowing amount and the blowing pressure.

  The primary heat exchanger 5 is a known gas / liquid heat exchanger, and is disposed downstream of the combustion unit 3 in the flow direction of the combustion gas. The primary heat exchanger 5 is a fin-and-tube heat exchanger whose main part is made of copper and in which hot water flows.

  The secondary heat exchanger 6 is a known gas / liquid heat exchanger, and is a part that recovers the thermal energy of the combustion gas that could not be recovered by the primary heat exchanger 5, and is combusted by the primary heat exchanger 5. It is arranged downstream in the gas flow direction. This secondary heat exchanger 6 is formed by incorporating a pipe (not shown) through which hot water flows inside the box-like body, and stainless steel or the like having high corrosion resistance is adopted as a raw material of this pipe. By doing so, it has a structure superior in corrosion resistance as compared with the primary heat exchanger 5.

  Next, each system of the heat source machine 1 will be described in detail.

  The hot water supply system 10 includes a water inlet pipe 20, a hot water outlet pipe 21, a bypass pipe 22, and a general hot water supply pipe 23.

  The inlet pipe 20 is a pipe for flowing hot water supplied from a water supply source (not shown) to the secondary heat exchanger 6 and the primary heat exchanger 5 (hereinafter also simply referred to as a heat exchanger).

  The hot water discharge pipe 21 is branched into a general hot water supply pipe 23 and a bath drop pipe 25 of the bath drop system 11 on the downstream side in the hot water flow direction. That is, hot water is supplied to the general hot water supply pipe 23 and the bath dropping pipe 25. At this time, the hot water flow rate adjusting valve 26 is provided at a portion of the hot water supply pipe 21 branched into the general hot water supply pipe 23 and the bath dropping pipe 25, and the flow rate of hot water flowing through the general hot water supply pipe 23 and the bath dropping pipe 25 is provided. Can be adjusted.

  The bypass pipe 22 is a pipe that connects the water inlet pipe 20 and the hot water outlet pipe 21 to bypass the heat exchanger.

  The general hot water supply pipe 23 supplies hot water that has passed through the heat exchanger to a hot water tap 15 such as a shower or a currant.

  In the bath dropping system 11, a bath dropping pipe 25 and the bath system 12 form a flow path (dropping path) continuous from an external water supply source to the bathtub 16.

  The bath dropping pipe 25 connects the above-described hot water outlet pipe 21 and the bath return pipe 33 of the bath system 12. The bath drop pipe 25 is provided with a backflow prevention device 30 constituted by a drop flow sensor 28 (bath use detecting means), a hot water solenoid valve 29, a check valve and the like from the upstream side.

  As shown in FIG. 1, the bath system 12 includes a bath return pipe 33 that forms a circulation channel including the bathtub 16 and a bath outlet pipe 34.

  The bath return pipe 33 is a pipe that returns hot water from the bathtub 16 side to the heat exchanger side, and the bath return pipe 34 is a pipe that sends hot water from the heat exchanger side to the bathtub 16 side. The bath return pipe 33 and the bath outlet pipe 34 are continuous via a heat exchanger, and form a circulation channel (bath circulation channel) including the bathtub 16.

  In this circulation channel, from the bathtub 16 side toward the heat exchanger side, a circulation adapter 37 attached to the bathtub 16, a two-way valve 38, a three-way valve 39, and a vortex pump 40 (drain discharge means) A reheating flow sensor 41 (bath use detecting means) is provided. Further, an adapter side three-way valve 42 is provided at a position adjacent to the outside of the bathtub 16.

  The circulation adapter 37 is attached to the side wall of the bathtub 16 and communicates the inside and outside of the bathtub 16. A bath return pipe 33 is connected to the circulation adapter 37, and a bath outlet pipe 34 is connected via an adapter side three-way valve 42.

The two-way valve 38 is provided in the middle of the bath return pipe 33 and closer to the bathtub 16 than the junction 45 where the bath drop pipe 25 and the bath return pipe 33 meet.
When the two-way valve 38 is in an open state, the bath-side pipe portion 33 a extending from the bathtub 16 to the two-way valve 38 in the bath return pipe 33 and the two-way valve 38 and the three-way valve 39 in the bath return pipe 33. The extended intermediate pipe part 33b is in communication with the hot water or the like between the bathtub side pipe part 33a and the intermediate pipe part 33b.
Further, when the two-way valve 38 is in a closed state, the bathtub-side pipe part 33a and the intermediate pipe part 33b are disconnected from each other, and the direction from the bathtub-side pipe part 33a side to the intermediate pipe part 33b side, and It will be in the state where hot water etc. do not flow in the direction which goes to the bathtub side piping part 33a side from the intermediate | middle piping part 33b side.

  The three-way valve 39 is provided in the middle of the bath return pipe 33 and is provided closer to the heat exchanger than the two-way valve 38 and the junction point 45 described above. The three-way valve 39 has three ports, two of which include a heat exchange side piping part 33c extending from the three-way valve 39 to the secondary heat exchanger 6 in the bath return pipe 33, and an intermediate pipe. The part 33b is connected to each other. A drain discharge pipe 55 described later is connected to the remaining port of the three-way valve 39.

The three-way valve 39 functions as a flow path switching means for switching the flow path by closing an appropriate port among the three ports.
For example, by closing the port to which the intermediate pipe part 33b is connected, the flow path connecting from the drain discharge pipe 55 to the heat exchange side pipe part 33c is communicated. At this time, liquid such as hot water or drain does not flow from the drain discharge pipe 55 or the heat exchange side pipe part 33c to the intermediate pipe part 33b, or from the intermediate pipe part 33b to the drain discharge pipe 55 or the heat exchange side pipe part 33c. It becomes a state.
Further, by closing the port to which the drain discharge pipe 55 is connected, the flow path connecting from the intermediate pipe portion 33b to the heat exchange side pipe portion 33c is brought into communication. At this time, liquid such as hot water or drain does not flow from the intermediate pipe part 33b or the heat exchange side pipe part 33c to the drain discharge pipe 55, or from the drain discharge pipe 55 to the intermediate pipe part 33b or the heat exchange side pipe part 33c. It becomes a state.

The adapter side three-way valve 42 is provided in the vicinity of the end of the bath outlet pipe 34 on the bathtub 16 side.
The adapter side three-way valve 42 has three ports, one of which is connected to the bath outlet pipe 34 and the other one is connected to the connecting pipe 47 extending from the circulation adapter 37. Yes. A drain pipe 48 connected to the outside is connected to the remaining port of the adapter side three-way valve 42.

The adapter-side three-way valve 42 also functions as a flow path switching means for switching the flow path by closing an appropriate port among the three ports.
For example, by closing the port to which the connecting pipe 47 is connected, the flow path from the bath outlet pipe 34 to the drain pipe 48 is brought into communication. At this time, liquid such as hot water flowing from the bath outlet pipe 34 to the bathtub 16 side is discharged from the drain pipe 48 to the outside, does not flow to the circulation adapter 37 side, and does not flow into the bathtub 16.
Further, by closing the port to which the drain pipe 48 is connected, the flow path connecting from the bath outlet pipe 34 to the connecting pipe 47 is brought into communication. At this time, liquid such as hot water flowing from the bath outlet pipe 34 to the bathtub 16 side flows into the bathtub 16 through the circulation adapter 37 and is not discharged from the drain pipe 48 to the outside.

  As described above, the circulation channel including the heat exchanger and the bathtub 16 is provided with a plurality of channel switching means (three-way valve 39 and adapter-side three-way valve 42). The flow path can be switched.

  As described above, since the secondary heat exchanger 6 mainly recovers latent heat of the combustion gas, the temperature of the combustion gas is reduced to a certain value or less in the secondary heat exchanger 6. As a result, water vapor contained in the combustion gas is liquefied and drainage is generated. The generated drain is exposed to the combustion gas, so that nitrogen oxides and sulfur oxides generated by combustion dissolve and exhibit acidity.

  Therefore, the heat source device 1 of the present embodiment has a configuration including a drain discharge system 50 for neutralizing the generated drain and discharging it to the outside.

  The drain discharge system 50 includes a drain pan (not shown) formed at the bottom of the case that houses the secondary heat exchanger 6 in order from the upstream side in the drain flow direction, a neutralizer 53 for neutralizing the drain, A drain tank 54 (storage means) for temporarily storing the drain neutralized by the neutralizer 53, a drain discharge pipe 55 connected to the drain discharge port of the drain tank 54, and a part of the bath system 12 It is constituted by.

  The interior of the neutralizer 53 is partitioned into a plurality of spaces by partition walls, and at least one space is filled with a neutralizing agent such as calcium carbonate (not shown). The drain that has flowed into the neutralizer 53 sequentially flows through the plurality of spaces, and flows out of the space when the liquid level (water level) exceeds a certain level. For this reason, drain will flow out after staying in each space in the neutralizer 53 for a predetermined time, and will slowly pass through the interior of the neutralizer 53 over time. The drain reacts with the neutralizing agent while remaining inside the neutralizer 53 to be neutralized.

Further, the neutralizer 53 includes a neutralizer liquid level detection device 60 (upstream side) for detecting that the liquid level (water level) of a predetermined space among the plurality of internal spaces has become a certain level or more. Detection means) is provided. The neutralizer liquid level detection device 60 is provided, for example, in the most upstream space in the drain flow direction among the plurality of spaces inside the neutralizer 53, and the liquid level (water level) of the space is a predetermined level. It is possible to detect that the liquid level has been reached.
More specifically, the neutralizer liquid level detection device 60 includes two conductive rod-shaped bodies (including a member having a rod-shaped portion), and the two rod-shaped bodies extend in the same space. Yes. The two rod-shaped bodies are electrically connected to a predetermined device (not shown) and function as electrodes. When the liquid level (water level) in the predetermined space rises to reach a predetermined position, each of the two rod-shaped bodies is immersed in the liquid (drain). Then, electricity is performed between the two rod-shaped bodies, and it is detected that the liquid level in the predetermined space has reached a predetermined height.

The drain tank 54 is a box having an internal space in which liquid can be stored. The drain tank 54 is provided with a tank liquid level detection device 61 (storage side detection means) for detecting the liquid level (water level) in the internal space.
The tank liquid level detection device 61 includes a plurality of round bar-like electrodes, and specifically, the longest ground electrode 61a and the same length (or slightly shorter) as the ground electrode 61a. It has a liquid level detection electrode 61b and a high liquid level detection electrode 61c shorter than the low liquid level detection electrode 61b. Then, the liquid such as drain stored in the drain tank 54 comes into contact with two or more of the ground electrode 61a, the low liquid level detection electrode 61b, and the high liquid level detection electrode 61c, thereby draining the drain. The liquid level of the drain or the like in the tank 54 can be detected.

More specifically, as the liquid level (water level) in the internal space of the drain tank 54 rises, the water level rises to a predetermined height (the height at which the lower end of the low liquid level detection electrode 61b is positioned). Then, not only the ground electrode 61 a but also the low liquid level detection electrode 61 b comes into contact with a liquid such as drain stored in the drain tank 54. As a result, energization is performed between the ground electrode 61a and the low liquid level detection electrode 61b, and the liquid level inside the drain tank 54 has a predetermined height (a high level at which the lower end of the low liquid level detection electrode 61b is positioned). It is detected by the tank liquid level detection device 61.
Similarly, when the liquid level in the internal space of the drain tank 54 further rises, energization is performed between the ground electrode 61a and the high liquid level detection electrode 61c, and the internal liquid level becomes a predetermined position that becomes higher. It is detected that the height (the height at which the lower end of the high liquid level detection electrode 61c is located) has been reached.

  Next, various operations that can be performed by the heat source apparatus 1 of the present embodiment will be described in detail.

  As described above, the heat source device 1 of the present embodiment can perform the general hot water supply operation, the dropping operation, and the reheating operation. In addition, a drain discharge operation for discharging the drain generated in the secondary heat exchanger 6 to the outside can be performed.

[General hot water supply operation]
When there is a hot water discharge request by operating the hot-water tap 15 or the like, hot water supplied from a water supply source (not shown) flows through the water inlet pipe 20 and is heated through the secondary heat exchanger 6 and the primary heat exchanger 5 to become a hot water outlet pipe. It is poured out to 21. In the hot water outlet pipe 21, the hot water heated through the secondary heat exchanger 6 and the primary heat exchanger 5 and the hot water passed through the bypass pipe 22 are mixed. Then, the mixed hot water is discharged to the general hot water supply pipe 23 and supplied from the general hot water supply pipe 23 to the hot water tap 15.

[Drop operation]
When a drop operation is requested by a remote controller (not shown), the pouring electromagnetic valve 29 of the bath dropping system 11 is opened. In addition, the two-way valve 38 of the bath system 12 is opened, and the port to which the drain discharge pipe 55 of the three-way valve 39 is connected is closed, so that the intermediate pipe part 33b and the heat exchange side pipe part 33c communicate with each other. It will be in the state. Then, hot water supplied from a water supply source (not shown) flows through the inlet pipe 20, is heated through the secondary heat exchanger 6 and the primary heat exchanger 5, and is discharged to the outlet pipe 21. In the hot water outlet pipe 21, the hot water heated through the secondary heat exchanger 6 and the primary heat exchanger 5 and the hot water passed through the bypass pipe 22 are mixed. Then, the mixed hot water is discharged into the bath dropping pipe 25 and flows into the bath return pipe 33. Then, the hot water is dropped into the bathtub 16 from the bath return pipe 33 and the bath return pipe 34 connected to the bath return pipe 33.

[Fast driving]
When a follow-up operation is requested by a remote controller (not shown), the two-way valve 38 of the bath system 12 is opened, and the port to which the drain discharge pipe 55 of the three-way valve 39 is connected is closed. It will be in the state which the part 33b and the heat exchanger side piping part 33c connected. Moreover, the vortex pump 40 is driven, and hot water in the bathtub 16 flows through the bath return pipe 33 and is sent to the secondary heat exchanger 6 and the primary heat exchanger 5 to raise the temperature. The heated hot water is returned to the bathtub 16 through the bath outlet pipe 34.

  In the present embodiment, in addition to these operations, a drain discharge operation for discharging the drain generated in the secondary heat exchanger 6 to the outside is performed. A drain discharge operation which is a characteristic operation of the present embodiment will be described in detail with reference to FIG.

  When it is detected that the liquid level of the drain stored in the internal space of the drain tank 54 is equal to or higher than a certain level (Yes in Step 1), a drop operation or a reheating operation that is a bath related operation is performed. It is confirmed whether or not (step 2).

  That is, as described above, when the liquid level in the internal space of the drain tank 54 rises and both the ground electrode 61a and the high liquid level detection electrode 61c come into contact with the drain, the ground electrode 61a and the high liquid level detection electrode 61c. Is energized. Then, it is detected that the liquid level in the internal space of the drain tank 54 is equal to or higher than a predetermined level (higher than the height at which the lower end of the high liquid level detection electrode 61c is positioned). In other words, it is detected that a certain amount or more of drain has already been stored in the internal space of the drain tank 54 and that it is preferable to perform the drain discharge operation.

  Here, in the heat source device 1 of the present embodiment, even if it is detected that the liquid level in the internal space of the drain tank 54 is equal to or higher than a predetermined level and it is preferable to perform the drain discharge operation, the drain discharge operation is immediately performed. Is configured not to start. In the heat source unit 1 of the present embodiment, on the condition that the liquid level in the internal space of the drain tank 54 is equal to or higher than a predetermined level, whether or not a bath-related operation is performed, that is, whether or not a drop operation is performed, It is confirmed whether or not a chasing operation is being performed.

  Specifically, the heat source device 1 determines that the drop operation is being performed when the drop flow sensor 28 detects that hot water is flowing in the bath drop pipe 25 at a flow rate higher than a certain level. . Further, when the reheating flow sensor 41 detects that hot water is flowing in the bath return pipe 33 at a certain flow rate or more, it is determined that the reheating operation is being performed.

  Then, when the drop-in operation and the follow-up operation are not performed (No in Step 2), the process proceeds to Step 6 and the drain discharge operation is performed. That is, when the user does not perform the bath-related operation and the drain discharge operation is performed, the user is not expected to wait for the use of the bath (the supply of heat by the heat source unit 1). Performs the drain discharge operation on condition that the liquid level in the internal space of the drain tank 54 is detected to be equal to or higher than a predetermined level.

Here, specific contents of the drain discharge operation will be described in detail.
When it is decided to perform the drain discharge operation, the two-way valve 38 of the bath system 12 is closed, and the port to which the intermediate pipe portion 33b of the three-way valve 39 is connected is closed and the drain discharge pipe is closed. 55 and the heat exchange side piping portion 33c are in communication with each other. Further, the port to which the connecting pipe 47 of the adapter side three-way valve 42 is connected is closed, and the bath outlet pipe 34 and the drain pipe 48 are in communication with each other.

  In addition, when the centrifugal pump 40 is driven in this state, the drain stored in the internal space of the drain tank 54 flows into the heat exchange side pipe portion 33c of the bath return pipe 33 through the drain discharge pipe 55. Then, it passes through the secondary heat exchanger 6 and the primary heat exchanger 5 as it is to reach the bath outlet pipe 34, flows through the bath outlet pipe 34 toward the bathtub 16, and is discharged from the drain pipe 48 to the outside. . Then, this operation is continued, and when it is detected that the liquid level in the internal space of the drain tank 54 is below the height at which the lower end of the low liquid level detection electrode 61b is positioned, the drain discharging operation Is terminated.

  At this time, the two-way valve 38 is closed, and each port of the three-way valve 39 is opened and closed to switch the flow path, so that the hot water in the bathtub 16 is exchanged heat when the three-way valve 39 is switching the flow path. It can prevent flowing into the side piping part 33c side.

  By the way, in this embodiment, the vortex pump 40 provided in the bath return pipe 33 is used for the formation of the circulation flow in the reheating operation and the formation of the drain flow in the drain discharge operation. In other words, the circulation pump for the chasing operation and the drain discharge pump are configured to be the same. In addition, as described above, a pipe belonging to the bath system 12 is used as a pipe downstream of the drain discharge pipe 55 of the drain discharge system 50 in the drain flow direction. That is, in the heat source device 1 of the present embodiment, the bath system 12 is a part of the drain discharge system 50. In other words, the pipe and the pump used in the drain discharge operation and the reheating operation are shared.

  Therefore, in the heat source apparatus 1 of the present embodiment, a drain discharge operation is performed (step 6), and then a piping and pump cleaning operation is performed (step 7).

  When performing the cleaning operation of the pipe and the pump, the operation of switching the flow path by opening and closing each port of the three-way valve 39 is performed from the state where the drain discharge operation is performed. More specifically, the two-way valve 38 of the bath system 12 is closed, the port to which the drain discharge pipe 55 of the three-way valve 39 is connected is closed, and the intermediate pipe part 33b and the heat exchange side pipe part. 33c is in a communication state. Further, the port to which the connecting pipe 47 of the adapter side three-way valve 42 is connected is closed, and the bath outlet pipe 34 and the drain pipe 48 are in communication with each other.

  In this state, hot water is caused to flow from the bath dropping pipe 25 to the bath return pipe 33 in the same manner as the above-described dropping operation. In addition, when performing washing | cleaning operation | movement, it is not necessary to heat hot water with the secondary heat exchanger 6 and the primary heat exchanger 5 like the case where dropping operation is implemented. Then, when hot water is caused to flow from the bath dropping pipe 25 to the bath return pipe 33, the hot water sequentially flows through the intermediate pipe portion 33b and the heat exchange side pipe portion 33c, and from the heat exchange side pipe portion 33c to the secondary heat exchanger 6. And it reaches the bath outlet pipe 34 via the primary heat exchanger 5, flows through the bath outlet pipe 34 toward the bathtub 16, and is discharged from the drain pipe 48 to the outside. That is, the intermediate pipe 33b, the heat exchange side pipe 33c, the inside of the centrifugal pump 40, the internal pipe of the secondary heat exchanger 6, the internal pipe of the primary heat exchanger 5, and the pipes of the bath outlet pipe 34 are filled with hot water. Is washed by flowing. And if each piping is fully wash | cleaned by continuing this operation | movement only for predetermined time, the washing | cleaning operation | movement of piping will be complete | finished. And a series of operation | movement is complete | finished in order to discharge | emit drain to the exterior.

  On the other hand, it is detected that the liquid level of the drain stored in the internal space of the drain tank 54 is equal to or higher than a certain level (in the case of Yes in Step 1), and the dropping operation or the reheating operation is performed. If it is (Yes in step 2), the drain discharge operation is not started immediately, but the drain discharge operation is put on standby (step 3).

  Then, when the neutralizer liquid level detector 60 detects that the liquid level in the neutralizer 53 has reached a predetermined position in a state where the drain discharge operation is on standby (Yes in step 4). Then, the drain discharge operation is performed (step 6), and then the pipe cleaning operation is performed (step 7), and the series of operations is terminated to discharge the drain to the outside.

  In other words, when the drain liquid level is above a certain level in the internal space of the drain tank 54 and more than a predetermined amount of drain is stored in the neutralizer 53 located on the upstream side of the drain tank 54, the drain discharge is promptly performed. If the operation is not performed, the drain may overflow from the neutralizer 53 to the upstream side. As described above, when it is predicted that a problem in operation of the heat source apparatus 1 will occur due to the fact that the drain is not discharged, priority is given to the drain discharge operation even if the heat source apparatus 1 performs a bath-related operation. To implement. That is, even if it is predicted that when the drain discharge operation is performed, the user is expected to wait for the use of the bath (the supply of heat by the heat source device 1), the drain discharge operation is quickly performed for safety.

  Further, when the neutralizer liquid level detection device 60 does not detect that the liquid level in the neutralizer 53 has reached the predetermined position (No in Step 4), the drain discharge operation is continuously waited. A state is set (step 3).

  If it is not detected by the neutralizer liquid level detection device 60 that the liquid level in the neutralizer 53 has reached a predetermined position, it is preferable to discharge the drain to the outside. A certain amount until the liquid level in the vessel 53 reaches a predetermined position does not cause a problem even if the drain is stored in the neutralizer 53. Furthermore, since the drain is not discharged to the outside, a problem in operation of the heat source device 1 does not occur immediately. In this case, the drain discharge operation is put on standby, and a bath-related operation such as a drop-down operation or a chase operation is preferentially performed over the drain discharge operation so that the user can use the bath (heat generated by the heat source device 1). (Supply) does not have to wait.

In other words, the heat source unit 1 is configured to quickly discharge the drain to the outside in order to ensure safety in a state where the bath-related operation is not performed, and the limit storage in the drain discharge system 50 as a whole. Drainage is discharged to the outside when the storage amount is sufficiently smaller than the amount. On the other hand, when a bath-related operation is being performed, the drainage amount is closer to the limit storage amount so that the user does not have to wait for a bath-related operation (desired operation). The configuration is such that the discharging operation is not performed.
Thus, the user can comfortably use the heat source device 1 without waiting for a bath-related operation.

  Then, the bath-related operation is completed (in step 5) without detecting that the liquid level in the neutralizer 53 has reached the predetermined position by the neutralizer liquid level detection device 60 (No in step 4). If yes, the drain discharge operation is performed (step 6). That is, on the condition that the bath-related operation has been completed (Yes in Step 5), the drain discharge operation is performed (Step 6), and then the pipe cleaning operation is performed (Step 6). A series of operations are terminated to discharge the outside.

  Here, even when waiting for the drain discharge operation, the liquid level in the neutralizer 53 reaches a predetermined position by the neutralizer liquid level detection device 60 before the bath-related operation is completed. If it is detected (No in Step 5 and Yes in Step 4), the drain discharge operation is performed as soon as possible for safety. That is, the drain discharge operation is immediately performed (step 6), and then the pipe cleaning operation is performed (step 7), and the series of operations is terminated to discharge the drain to the outside.

In the above-described embodiment, the example in which the neutralizer liquid level detection device 60 of the neutralizer 53 located on the upstream side of the drain tank 54 is used as the upstream side detection means is shown, but the present invention is not limited to this. . For example, the upstream side detection means may be provided in any one of the drain pan, the vicinity of the drain pan, a pipe positioned between the drain pan and the neutralizer 53, and a pipe positioned between the neutralizer 53 and the drain tank 54.
Further, the heat source apparatus of the present invention may employ a neutralizer in which the neutralizer and the drain tank are integrated without providing the neutralizer and the drain tank separately. That is, you may employ | adopt the neutralizer which can store the neutralized drain. In this case, the upstream side detection means is provided in one of the drain pan, the vicinity of the drain pan, or a pipe located between the drain pan and the neutralizer, and a predetermined portion of the internal space of the neutralizer, that is, the internal space divided into a plurality It is good also as a structure which provides the storage side detection means which can detect the liquid level of a predetermined part.

  In addition, when a neutralizer in which a neutralizer and a drain tank are integrated is adopted, a first detection means that can detect different liquid levels in one neutralizer (in the above example, the storage-side detection means). Equivalent) and second detection means (corresponding to the upstream detection means in the above example). That is, a first detection means capable of detecting a low liquid level and a second detection means capable of detecting a high liquid level among liquid levels in a predetermined portion of the internal space divided into a plurality of neutralizers may be provided. Good. In this case, if the bath-related operation is not performed, the drain discharge operation and the piping and pump cleaning operation are performed on the condition that the liquid level of the first detection means is detected to be above a certain level. May be. In addition, when a bath-related operation is performed, even if the first detection means detects that the liquid level has reached a certain level or more, the drain discharge operation starts to wait, and after the bath-related operation ends, the drain The structure which performs discharge | emission operation | movement and piping and the washing | cleaning operation | movement of a pump may be sufficient. Furthermore, even in a state where the start of the drain discharge operation is in a standby state, the drain discharge operation may be started when it is detected that the liquid level of the second detection means has reached a certain level.

1 Heat source machine 3a Burner 6 Secondary heat exchanger (heat exchanger)
16 Bathtub 28 Flow sensor for dropping (Bath use detection means)
40 Centrifugal pump (drain discharge means)
41 Flow sensor for reheating (detection means for bath use)
54 Drain tank (storage means)
60 Neutralizer level detector (upstream detection means)
61 Tank level detection device (storage side detection means)

Claims (4)

A burner that burns fuel to generate combustion gas, a heat exchanger that mainly recovers the latent heat of the combustion gas, a storage means for storing drain generated in the heat exchanger, and a storage means Drain discharge means for carrying out a drain discharge operation for discharging the drain to the outside,
The storage means is provided with a storage side detection means capable of detecting an internal liquid level, and an upstream side detection means capable of detecting the presence or absence of drain at a predetermined position on the upstream side in the drain flow direction of the storage means. Provided,
Even if the storage side detection means detects a liquid level above a predetermined level, an operation that does not start the drain discharge operation is possible until the upstream side detection means detects that the drain has reached a predetermined position. A heat source machine characterized by In order to carry out a drop-in route for carrying out a drop-in operation for pouring hot water heated by the heat exchanger into the bathtub, and a reheating operation for taking out the hot-water from the bathtub and passing it through the heat exchanger and then returning it to the bathtub again Bath circulation channels are provided as needed,
Having bath use detection means capable of detecting whether the drop-down operation or the chasing operation is being carried out,
While the dropping operation or the chasing operation is being performed, the drain discharge operation is not started even when the storage side detection means detects a liquid level higher than a predetermined level, and the dropping operation or the chasing operation is performed. 2. The heat source apparatus according to claim 1, wherein the drain discharge operation is started on condition that the sowing operation has been completed.   The drain discharge operation is started on the condition that the storage side detection means detects a liquid level higher than a predetermined level while the dropping operation or the reheating operation is not performed. The heat source machine described.   When the dropping operation or the chasing operation is performed and the storage side detection means detects a liquid level higher than a predetermined level, the upstream side detection means detects that the drain has reached a predetermined position. 4. The heat source device according to claim 2, wherein waiting for the drain discharge operation is interrupted to start the drain discharge operation.

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