JP2013092295A - Heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source machine that can implement water sealing of a drain discharge system by an inexpensively-providable structure employable even for a downsized heat source machine without restricting the shape and size of each member in the heat source machine.SOLUTION: In this heat source machine 1 including a burner 15 for burning fuel, and a heat exchanger 18 for mainly recovering latent heat of combustion gas produced by operating the burner 15, a bath drop-in system 6 for dropping hot water into a bathtub, and a drain discharge system 20 for neutralizing drain produced in the heat exchanger 18 to be discharged to the outside are formed. A water sealing device 51 forming a part of the drain discharge system 20 and/or an upstream part of the water sealing device 51 are/is continuously connected to a water filling pipe 52 branched from the bath drop-in system 6.

Description

  The present invention relates to a heat source apparatus that is capable of recovering the latent heat of combustion gas and that has a drain discharge system that neutralizes the drain generated when recovering the latent heat and discharges it to the outside.

  In recent years, in order to improve the heat exchange efficiency of heat generated when a burner is burned, a latent heat recovery type heat source machine (also called a condensing type heat source machine) that recovers not only sensible heat of combustion gas but also latent heat. ) Is popular in the market. 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 the combustion gas, and condenses water vapor contained in the combustion gas. Therefore, heat of condensation (latent heat) can be obtained, so that the heat exchange efficiency is high.

  In such a heat source device, when the combustion gas is introduced into the secondary heat exchanger and the latent heat is recovered, the combustion gas and the secondary heat exchanger come into contact with each other, so that water vapor in the combustion gas is condensed. Drain (condensation water) is generated. At this time, the combustion gas includes nitrogen oxides (N0x) generated by the reaction of nitrogen and oxygen in the air by combustion, and sulfur oxides generated by the reaction of the sulfur content of the fuel with oxygen by combustion. (S0x) and the like are contained. Therefore, the generated drain is strongly acidic due to these nitrogen oxides and sulfur oxides. As described above, in the latent heat recovery type heat source machine, structurally strong acid drainage is generated.

  If this acidic drain is drained to the outside without being treated, there is a concern that it may adversely affect the environment and the like. 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 that neutralizes 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.

  By the way, in the heat source machine provided with such a drain discharge system, the flow path of the combustion gas and the drain discharge system are configured to communicate with each other. That is, as described above, drainage is generated when the combustion gas comes into contact with the secondary heat exchanger. Therefore, the portion where the drainage is generated is located in the flow path through which the combustion gas flows. As a result, the combustion gas flow path and the drain discharge system are connected (connected).

  For this reason, the problem that combustion gas will flow into a drain discharge system can be considered. In other words, not only the drain but also the combustion gas enters the drain discharge system, and the combustion gas is discharged from the drain discharge system unexpectedly. Such a problem needs to be surely prevented from the viewpoint of ensuring the safety of residents, particularly when the heat source device is installed indoors.

  Therefore, in the hot water heating apparatus (heat source machine) disclosed in Patent Document 1, in order to solve this problem, a storage unit capable of storing a liquid such as drain is formed in the drain discharge system. And the part which became the water-sealed state in a part of drain drain system is formed by accumulating the liquid in the storage means formed in the drain drain system. This forcibly blocks the flow of combustion gas from the upstream side to the downstream side of the water-sealed portion. According to the configuration of the hot water heater disclosed in Patent Document 1, even if combustion gas flows into the drain discharge system, the combustion gas does not flow downstream from a predetermined portion of the drain discharge system. Therefore, it is possible to reliably prevent combustion gas from being discharged from the drain discharge system.

  By the way, in the structure of the hot water heating apparatus disclosed in Patent Document 1, it is necessary to always maintain a state in which liquid is accumulated in the storage means while the hot water heating apparatus is operated to form a water seal state. Therefore, in the hot water heating apparatus disclosed in Patent Document 1, when normal operation is performed, the drain is stored in the storage unit to be in a water-sealed state, and a sufficient amount of drain is not present in the storage unit to form a water-sealed state. Is configured to replenish the storage means with the liquid replenishing means. Specifically, as the liquid replenishing means, a valve is formed in the water injection pipe branched from the water inlet pipe, and hot water is supplied from the water injection pipe to the storage means.

  In addition to the method of forming a valve in the water injection pipe branched from the water intake pipe as in Patent Document 1, a configuration in which a water injection bag (water injection tank) is attached to the storage means as a means for forming a water seal state is widely known. It has been. In this configuration, a water injection bag is attached to the storage means, and hot water is supplied in advance to the attached water injection bag. When a sufficient amount of drain is not present in the storage means to form a water-sealed state, hot water is supplied from the water injection bag to the storage means to form a water-sealed state.

JP 2008-298367 A

  However, as in the configuration of the hot water heater disclosed in Patent Document 1, when water is poured into the storage means by a water injection pipe branched from the incoming water pipe, the shape of the storage means is restricted due to provisions in the Waterworks Law. End up. More specifically, the provisions of the Water Supply Law prohibit direct connection between water supply pipes and pipes other than water supply (so-called cross connection is prohibited). Thus, when water is poured into the storage means by the water injection pipe branched from the water intake pipe, the drain stored in the storage means and the water injection pipe are formed by a method of forming a space near the connection port of the water injection pipe on the storage means side. It is necessary to ensure that there is no direct contact with the connection port. In other words, a space or the like must be formed in the vicinity of the inlet of the water injection pipe formed in the storage means, and the degree of freedom in designing the internal structure of the heat source unit is reduced.

  Moreover, when water is poured into the storage means by a water injection pipe branched from the water intake pipe, the flow rate may vary due to the water pressure of the water supply source (water supply). That is, the flow rate of the hot water supplied to the storage means fluctuates, and a problem that an appropriate hot water supply cannot be performed is predicted. Therefore, as a method for solving this problem, there is a method in which a flow rate adjusting valve is provided in the water injection pipe branched from the water inlet pipe. However, it is not desirable to provide a flow rate adjusting valve only for pouring water into the storage means because the manufacturing cost of the heat source device increases.

Furthermore, the configuration in which the water injection bag dedicated to water injection is attached to the storage means as described above has a problem that the heat source device cannot be reduced in size. Specifically, in recent years, miniaturized heat source devices that can be installed in a narrow place have been developed, and in such heat source devices, the internal space of the heat source device is substantially narrowed. In such a heat source machine, since a wide space cannot be secured around the installation position of the storage means, an area for installing the water injection bag cannot be secured. Therefore, in order to install the water injection bag, there is a problem that the storage means must be downsized unnecessarily.
Furthermore, in the configuration in which the water injection bag is attached, there is a problem that the contractor must perform the water injection operation to the water injection bag at the time of the installation work of the heat source machine, which increases the burden on the contractor.

  Therefore, in view of the above-described problems of the conventional technology, the present invention can be applied to even a downsized heat source device without any limitation on the shape and size of each member inside the heat source device, and is inexpensive. It is an object of the present invention to provide a heat source device that can perform water sealing of a drain discharge system with a configuration that can be provided.

  The invention according to claim 1 for solving the above-mentioned problem is a heat source apparatus comprising a burner that burns fuel, and a heat exchanger that mainly recovers latent heat of combustion gas generated by the operation of the burner. A bath dropping system for dropping hot water into the bathtub and a drain discharging system for neutralizing the drain generated in the heat exchanger and discharging the drain to the outside. A water seal device is provided to block the gas flow to the side, and the water injection pipe branched from the bath dropping system is continuous with the water seal device and / or the upstream portion of the water seal device. It is a heat source machine.

The heat source device of the present invention has a water injection pipe branched from the bath dropping system, and the water injection pipe and the water sealing device (or the upstream portion of the water sealing device) are continuous. That is, hot water can be supplied from the bath dropping system to the water seal device. In this way, when the water injection pipe is branched from the bath dropping system, the water supply law is used to connect the water injection pipe and the water seal device, unlike the case where the water injection pipe is formed in the water supply pipe as described above. You are not subject to the above restrictions. That is, there is no need to process the water sealing device or its vicinity so that the drain of the water injection pipe does not come into contact with the water inlet, and the design freedom of the water sealing device can be improved. The structure of the device or the vicinity thereof can be simplified. In addition, the water injection pipe branched from the bath dropping system is not directly affected by the flow fluctuation due to the water pressure of the water supply source (water supply), unlike the water injection pipe branched from the incoming water pipe. Supply can be performed with a simple structure.
Furthermore, according to the configuration in which the water injection pipe is branched from the bath dropping system of the present invention, even when a large space cannot be secured in the vicinity of the water sealing device inside the heat source machine, hot water supply operation to the water sealing device can be performed. . In other words, it is sufficient to secure only the area where the bath dropping system piping is arranged by sharing the piping of the bath dropping system with the dropping of hot water into the bathtub and the hot water supply operation to the water seal device. There is no need to newly secure a region for installing a device (for example, the above-described water injection bag) for carrying out the above. Thus, even when there is no large space inside like a miniaturized heat source machine, the hot water supply operation to the water seal device can be performed.

  According to a second aspect of the present invention, the bath dropping system includes a backflow preventing means for preventing a flow of hot water from the downstream side to the upstream side, the bath dropping pipe forming a part of the bath dropping system, and the note 2. The heat source apparatus according to claim 1, wherein a branching portion where the water pipe intersects is located downstream of the backflow prevention unit.

In the heat source machine of the present invention, the backflow preventing means for preventing the flow of hot water from the downstream side to the upstream side is provided in the bath dropping system. And the bath dropping pipe and the water injection pipe are branched on the downstream side of the backflow prevention means. As a result, since the backflow prevention means can be shared by the bath dropping system and the drain discharge system, it is not necessary to newly provide a member such as a valve to prevent the backflow of drain water or the like from the water seal device side. The manufacturing cost of the machine can be reduced.
Specifically, as described above, the Water Supply Law has a provision prohibiting direct connection between a water supply pipe and a pipe other than the water supply. Therefore, backflow prevention means such as a hopper device and an edge cut-off valve device are formed in the bath dropping system so that hot water does not flow backward from the bathtub side to the hot water supply side. Here, in the heat source machine of the present invention, a water injection pipe is formed on the downstream side of such a backflow prevention means. Thus, the backflow prevention means of the bath dropping system can be used for preventing the backflow of drain water from the water seal device. As a result, it is possible to reliably prevent the backflow of drain water from the water sealing device to the upstream via the water injection pipe. And since it is not necessary to provide members, such as a new valve, in order to prevent this backflow of drain, the manufacturing cost of a heat source machine can be reduced.

  According to a third aspect of the present invention, a flow path capable of switching between a state where hot water can be poured into the bathtub side and a state where hot water can be poured into the water sealing device side at the branch portion where the water injection pipe branches. The heat source apparatus according to claim 1, wherein a switching unit is provided.

  In the heat source machine of the present invention, there is provided a flow path switching means capable of switching between a state where hot water can be poured into the bathtub side and a state where hot water can be poured into the water sealing device side. That is, the flow path can be switched between when hot water is poured into the bathtub side and when hot water is poured into the water sealing device side. More specifically, when hot water is poured into the bathtub side, hot water does not flow to the water sealing device side, and when hot water is poured into the water sealing device side, hot water does not flow to the bathtub side. For this reason, when there is a need to vary the flow rate of hot water in the water injection operation for each of the bathtub and the water sealing device due to the large difference in storage capacity of the hot water between the bathtub and the water sealing device, water is injected. The flow rate of hot water can be easily controlled. That is, when performing the water pouring operation for each of the bathtub and the water seal device, it is possible to carry out by simply flowing the hot water required for each water pouring operation into the bath dropping system, so the flow rate of the hot water can be easily adjusted. Become.

  According to a fourth aspect of the present invention, whether the branching portion where the water injection pipe branches is in a state where hot water can be poured into the bathtub side or a state where hot water can be poured into the water sealing device side The heat source apparatus according to claim 3, further comprising a flow path detection unit capable of detecting

  In the heat source machine of the present invention, there is provided a flow path detecting means capable of detecting whether the hot water can be poured into the bathtub side or the hot water can be poured into the water sealing device side. . According to such a configuration, hot water can be supplied to the bathtub or the water seal device after detecting the state of the flow path of the bath dropping system. Therefore, it is possible to reliably prevent hot water from flowing into unnecessary flow paths when the water injection operation is performed on each of the bathtub or the water sealing device, and the water injection operation can be performed accurately.

  Therefore, in the invention according to claim 4, it is possible to carry out water injection to the water sealing device on the condition that the flow path detecting means detects that the hot water can be injected into the water sealing device side. More desirable (Claim 5).

  According to a sixth aspect of the present invention, the water sealing device is formed integrally with a neutralizing device for neutralizing and discharging the drain, and includes a water level detecting means for detecting the level of the internal drain and / or hot water. The water injection to the water sealing device is stopped on the condition that it has been detected that the water level in the water sealing device is equal to or higher than a predetermined water level. It is a heat source machine.

  In the heat source apparatus of the present invention, the water sealing device is formed integrally with the neutralization device, and the neutralization device that temporarily stores and neutralizes the drain also functions as the water sealing device. Further, the neutralization device is provided with a water level detection means for detecting the level of internal drain and / or hot water. Then, water injection to the neutralizer is stopped on the condition that the water level inside the neutralizer is detected to be equal to or higher than a predetermined water level. As a result, a truly necessary amount of hot water can be supplied to the neutralizer, so an excessive amount of hot water is supplied to the neutralizer, or the amount of hot water supplied to the neutralizer is insufficient. Therefore, the water injection operation to the neutralizer can be performed more accurately.

In the present invention, the water injection pipe branched from the bath dropping system is continuous with the water sealing device (or the vicinity thereof), and hot water can be supplied from the bath dropping system to the water sealing device. As a result, there is no restriction by the provisions of the Waterworks Law on the connection of the water injection pipe to the water sealing device side, and it is necessary to perform special processing on the member on the water sealing device side for the connection of the water injection pipe. Therefore, there is an effect that the degree of freedom in designing the internal structure of the heat source machine is improved.
In addition, by supplying hot water from the bath dropping system to the water sealing device, it is not directly affected by flow fluctuations due to the water pressure of the water supply source (water supply), so it is easy to supply appropriate hot water to the water sealing device. There is an effect that can be done.
Furthermore, the piping of the bath drop-in system can be used both for dropping hot water into the bathtub and for supplying hot water to the water seal device. There is no need to distribute. Thereby, even if it is a miniaturized heat source machine that cannot secure a large space inside, there is an effect that water injection operation to the water sealing device can be performed without changing the size of the member such as the water sealing device. is there.

It is an operation principle figure showing a heat source machine concerning an embodiment of the present invention. It is an operation principle figure which shows the heat source machine of Drawing 1, and is a figure showing the hot-water supply system in black. It is an operation principle figure which shows the heat source machine of Drawing 1, and is the figure which showed the bath dropping system black. It is a conceptual diagram which shows the backflow prevention apparatus of FIG. It is a perspective view which shows the contact switch of FIG. It is an operation principle figure which shows the heat source machine of Drawing 1, and is a figure showing a bath system black. It is an operation principle figure which shows the heat source machine of Drawing 1, and is a figure showing the drain discharge system by black painting. It is a conceptual diagram which shows the structure of the neutralization apparatus of FIG. It is a flowchart which shows the procedure of the water injection operation | movement which concerns on embodiment of this invention.

  Hereinafter, although the heat source machine 1 which concerns on embodiment of this invention is demonstrated in detail, this invention is not limited to these examples.

  The heat source apparatus 1 according to the first embodiment of the present invention includes a combustion apparatus 2 that burns combustion gas supplied from the outside, and a hot water supply system 3, a bath system 4, a heating system 5, and a bath dropping system 6. ing. Here, in the hot water supply system 3, a general hot water supply operation in which hot water is discharged from the hot water tap 32 can be performed. Further, in the bath system 4, it is possible to perform a reheating operation in which hot water in the bathtub 46 is circulated and heated appropriately. Furthermore, in the heating system 5, it is possible to perform a heating operation in which hot water is circulated with an external load device such as an external fan convector or a floor heater, and in the bath dropping system 6, hot water is supplied to the bathtub 46. It is possible to perform an automatic dropping operation to pour hot water.

  Moreover, the heat source machine 1 is provided with the controller 7, and when the controller 7 issues an operation command to each part of the heat source machine 1, the heat source machine 1 performs various operations.

The combustion device 2 includes two independent can bodies and a piping system. That is, as shown in FIG. 1, the right can body is used for general hot water supply operation and automatic dropping operation, and the left can body is used for reheating operation and heating operation. Each of the left and right cans includes a combustion unit 10, a blower 11 that supplies air to the combustion unit 10, combustion gas generated in the combustion unit 10, hot water, a heat medium, and the like (hereinafter simply referred to as hot water). The heat exchange unit 12 performs heat exchange, and the exhaust unit 13 discharges the combustion gas that has passed through the heat exchange unit 12 to the outside of the can body.
And the space which connects each inside of the combustion part 10, the heat exchange part 12, and the exhaust part 13 is formed, and the combustion gas generated in the combustion part 10 can flow. Accordingly, when the combustion device 2 is operated, the combustion gas generated in the combustion unit 10 flows to the heat exchange unit 12 and reaches the exhaust unit 13. And it is discharged | emitted from the exhaust port of the exhaust part 13 outside.

  The combustion unit 10 includes a burner 15 and is configured to generate high-temperature combustion gas by burning fuel such as gas or kerosene supplied from the outside.

  The heat exchanging unit 12 includes a primary heat exchanger 17 that mainly recovers sensible heat of the combustion gas, and a secondary heat exchanger 18 (heat exchanger) that mainly recovers the latent heat of the combustion gas. The primary heat exchanger 17 is located upstream of the secondary heat exchanger 18 in the flow direction of the combustion gas and is connected in series with each other.

  The primary heat exchanger 17 is a fin-and-tube heat exchanger whose main part is made of copper and in which hot water flows.

  The main part of the secondary heat exchanger 18 is made of stainless steel, and is superior in corrosion resistance compared to the primary heat exchanger 17. Here, since the secondary heat exchanger 18 recovers the thermal energy of the combustion gas that could not be recovered in the primary heat exchanger 17, the combustion gas that has passed through the secondary heat exchanger 18 has a temperature of 100 degrees Celsius or less. It becomes low temperature. As a result, water vapor contained in the combustion gas is liquefied and drainage is generated. At this time, since the drain is exposed to the combustion gas, it exhibits strong acidity. The heat source apparatus 1 of the present embodiment is provided with a drain discharge system 20 that can neutralize this acidic drain and discharge it to the outside.

  Next, each system of the heat source machine 1 will be described in detail. Since the bath dropping system 6 and the drain discharge system 20 have the characteristic configuration of the present invention, the bath dropping system 6, the drain discharge system 20, the hot water supply system 3 connected to the bath dropping system 6, and the bath dropping system 6 The bath system 4 forming the section will be described, and the detailed description of the heating system 5 will be omitted.

  As shown in FIG. 2, the hot water supply system 3 includes a water inlet pipe 25, a hot water outlet pipe 26, a bypass pipe 27, and a general hot water supply pipe 28.

  The inlet pipe 25 is a pipe for flowing hot water supplied from a water supply source (not shown) to the secondary heat exchanger 18 and the primary heat exchanger 17. In the middle of the water intake pipe 25, an incoming water flow rate sensor 29 is provided.

  The hot water discharge pipe 26 branches into a general hot water supply pipe 28 and a bath drop pipe 34 of the bath drop system 6 on the downstream side in the hot water flow direction. That is, hot water is supplied to the general hot water supply pipe 28 and the bath dropping pipe 34. At this time, the hot water flow rate adjusting valve 30 is provided at a portion of the hot water supply pipe 26 branched to the general hot water supply pipe 28 and the bath dropping pipe 34, and the flow rate of hot water flowing through the general hot water supply pipe 28 and the bath dropping pipe 34 is provided. Can be adjusted.

  The bypass pipe 27 is a pipe that is connected to the water inlet pipe 25 and the hot water outlet pipe 26 and bypasses the heat exchange unit 12. A bypass flow rate adjustment valve 31 is provided on the upstream side in the flow direction of the bypass pipe 27, which is a connection portion between the bypass pipe 27 and the water inlet pipe 25. The bypass flow rate adjustment valve 31 can increase or decrease the flow rate of hot water flowing through the bypass pipe 27 by changing the opening degree. In this way, by controlling the flow rate of hot water, it is possible to control the hot water temperature in the general hot water supply operation and the automatic dropping operation.

  The general hot water supply pipe 28 supplies hot water that has passed through the combustion device 2 to a hot water tap 32 such as a shower or a currant.

  As shown in FIG. 3, the bath dropping system 6 is formed by a bath dropping pipe 34 and the bath system 4.

  The bath dropping pipe 34 connects the above-described hot water discharge pipe 26 and the bath return pipe 35 of the bath system 4. The bath dropping pipe 34 is provided with a bath flow sensor 38, a pouring solenoid valve 39, and a backflow prevention device 40 (backflow prevention means) from the upstream side.

  The backflow prevention device 40 is formed by two check valves 41 and 41 and a backflow blocking device 42.

  The check valve 41 is a valve having a function of opening when hot water flows in the forward direction and closing when hot water flows in the reverse direction.

The backflow blocking device 42 is a valve having a function of discharging hot water flowing in the reverse direction to the outside of the pipe. That is, the hot water passing through the portion where the reverse flow blocking device 42 of the pipe is provided flows through the pipe when flowing in the forward direction, and is discharged outside the pipe when flowing in the reverse direction.
Specifically, as shown in FIG. 4, when hot water flows in the forward direction and passes through the backflow prevention device 40, the hot water branches into a main flow channel 66 and a sub flow channel 67. At this time, the hot water flowing into the backflow prevention device 40 through the main flow channel 66 passes through the two check valves 41a and 41b and flows out from the pipe connection port 65 to the downstream side. At this time, the hot water that has flowed into the backflow prevention device 40 via the sub-channel 67 presses the backflow prevention valve 68 of the backflow prevention device 42 to close the hot water discharge port 69. Thus, the backflow prevention valve 68 is closed, so that the hot water flowing in from the main flow channel 66 flows to the pipe connection port 65 side without being discharged from the hot water discharge port 69 to the outside of the pipe. Yes. That is, even if the hot water flowing from the main channel 66 flows to the hot water discharge port 69 side when passing through the first check valve 41a, the hot water discharge port 69 is blocked by the backflow prevention valve 68. It does not flow out of the piping from here. Thus, the hot water flows toward the second check valve 41b and flows out from the pipe connection port 65 to the downstream side.

  On the other hand, the case where hot water flows in the reverse direction and passes through the backflow prevention device 40 will be described. There is a bathtub 46 at a position higher than the heat source unit 1 such as the second floor of the house, and when water breakage occurs, the hot water may flow back through the bath dropping pipe 34. At this time, if hot water flowing back into the backflow prevention device 40 flows from the pipe connection port 65 and passes through the check valve 41b due to a failure of the check valve 41b or the like, the hot water flows into the hot water discharge port 69 side. It flows toward. At this time, unlike the case where hot water flows in the forward direction, the backflow prevention valve 68 is not pressed and the hot water discharge port 69 is open. Therefore, the hot water flowing backward is discharged from the hot water outlet 69 to the outside of the pipe. As described above, the backflow blocking device 42 according to the present embodiment is configured such that even if hot water flows back through the check valve 41, the backflowed hot water can be discharged to the outside of the pipe.

  Further, as shown in FIG. 3, the bath dropping pipe 34 includes a portion toward the bath return pipe 35 downstream of the backflow prevention device 40 in the hot water flow direction, and a neutralizing device 51 (water seal) of the drain discharge system 20. Branches to a water injection pipe 52 connected to the apparatus. In other words, the water injection pipe 52 connecting the bath dropping pipe 34 and the neutralizing device 51 extends from the middle part of the bath dropping pipe 34.

  Further, the bath dropping pipe 34 is a connecting portion of the water injection pipe 52, and has a three-way valve 43 (flow path) at a branch portion that becomes a branch point of the flow path toward the bath return pipe 35 and the flow path toward the neutralizer 51. Switching means) and a contact switch 44 (flow path detecting means) are provided.

  The three-way valve 43 has three ports 43a to 43c and can switch the flow path to two paths. Specifically, in the three-way valve 43, when the port 43a and the port 43b communicate with each other, the other port 43c is closed, and the flow path toward the neutralizing device 51 can be circulated. That is, the flow path from the hot water discharge pipe 26 to the neutralization device 51 through the upstream portion of the bath dropping pipe 34 can be circulated, so that hot water can be supplied to the neutralization device 51.

  On the other hand, when the port 43a and the port 43c of the three-way valve 43 communicate with each other, the other port 43b is closed, and the flow path toward the bath return pipe 35 can be circulated. That is, the flow path from the hot water discharge pipe 26 to the bath return pipe 35 through the bath dropping pipe 34 can be circulated, and the hot water can be supplied to the bathtub 46 side.

  The contact switch 44 is, for example, a known limit switch or micro switch, and can detect the open / closed state of the ports 43 a to 43 c by a method such as detecting the handle position of the three-way valve 43. Specifically, as shown in FIG. 5, the three-way valve 43 has a structure that switches the flowing direction of hot water by rotating the switching lever 48. When the switching lever 48 is turned, the switching lever 48 comes into contact with a part of the contact switch 44, and a part of the contact switch 44 is pushed by the switching lever 48 to move. Thus, the contact switch 44 can detect the posture of the switching lever 48, that is, the switching state of the hot water flow direction. More specifically, the contact switch 44 can supply hot water to the neutralizing device 51 in which the ports 43a and 43b of the three-way valve 43 communicate with each other, and the bathtub 46 in which the ports 43a and 43c of the three-way valve 43 communicate with each other. It is possible to detect which of the two states in which hot water can be supplied to the side.

  As shown in FIG. 6, the bath system 4 includes a bath return pipe 35 that forms a circulation flow path including a bathtub 46, and a bath outlet pipe 36.

The bath return pipe 35 is a pipe that returns hot water from the bathtub 46 side to the heat exchange section 12 side of the combustion apparatus 2, and the bath return pipe 36 is a pipe that sends hot water from the heat exchange section 12 side to the bathtub 46 side. The bath return pipe 35 and the bath outlet pipe 36 are continuous via a reheating heat exchanger 45 and form a circulation channel including a bathtub 46.
In the reheating heat exchanger 45, the liquid (heat medium) flowing through the circulation passage formed so as to pass through the heat exchange unit 12 of the combustion device 2, the bath return pipe 35 including the bathtub 46, and the bath Heat exchange with hot water flowing through the circulation flow path formed by the pipe 36 is possible.

  As shown in FIG. 7, the drain discharge system 20 includes a drain introduction pipe 50, a neutralization device 51, and a drain discharge pipe 53.

  The drain introduction pipe 50 is a pipe that connects a drain recovery unit (not shown) such as a drain pan disposed in the vicinity of the secondary heat exchanger 18 of the combustion apparatus 2 and the neutralization device 51, and performs secondary heat exchange. The drain generated in the vessel 18 is provided so as to be introduced into the neutralizing device 51.

  As shown in FIG. 8, the neutralization device 51 is divided into a plurality of spaces by a partition wall 60, and a neutralizing agent (not shown) such as calcium carbonate is contained in at least one space. Filled. And the drain which flowed in flows sequentially in this some space. At this time, in each space, the drain that has flowed into the space once stays and flows out of the space when the water level exceeds a certain level. That is, the drain that has flowed into the neutralizing device 51 flows out after remaining in the respective spaces in the neutralizing device 51 for a predetermined time. Therefore, when the drain passes through the space filled with the neutralizing agent, it slowly passes over time. Further, the drain is neutralized by reacting with the neutralizing agent while remaining in the space.

  That is, the drain that has flowed into the neutralizing device 51 is stored in the neutralizing device 51 for a predetermined time, and is neutralized by reacting with the neutralizing agent while being stored. Then, the neutralized drain flows to the drain discharge port 62 of the neutralizer 51 and is discharged from the drain discharge port 62 to the drain discharge pipe 53 (see FIG. 7).

  Here, when the drain remains in the space formed inside the neutralizing device 51, a space in which the drain is accumulated is formed between the drain inlet 61 of the neutralizing device 51 and the drain outlet 62. As a result, the space between the drain inlet 61 and the drain outlet 62 is water-sealed, and the gas cannot pass (hereinafter also referred to as a water-sealed state). Thus, in addition to the function for neutralizing the drain, the neutralizing device 51 also has a function as a water sealing device.

  In addition, a plurality of electrodes 55, 56, 57, 58 that form part of a water level detection device (water level detection means) are integrally attached to the neutralization device 51. The plurality of electrodes 55, 56, 57, and 58 have different lengths, and become longer in the order of the electrodes 55, 56, 57, and 58. Further, the liquid level of the drain or the like in the neutralizing device 51 can be detected by the liquid such as the drain in the neutralizing device 51 coming into contact with two or more of the plurality of electrodes 55, 56, 57 and 58. It has become.

  More specifically, as the water level in the neutralizing device 51 rises, the water level rises to a predetermined height L1. Then, not only the longest electrode 58 but also the second longest electrode 57 comes into contact with a liquid such as drain stored in the neutralizing device 51. At this time, energization is performed between the longest electrode 58 and the second longest electrode 57. Thus, the water level detection device detects that the water level inside the neutralizing device 51 has reached the predetermined height L1. Similarly, when the water level inside the neutralizing device 51 further rises and reaches a predetermined height L2, energization is performed between the longest electrode 58 and the third longest electrode 56, and the internal water level is reduced. It is detected that the predetermined height L2 has been reached. Furthermore, when the water level inside the neutralizing device 51 rises and reaches a predetermined height L3, energization is performed between the longest electrode 58 and the shortest electrode 55, and the internal water level becomes a predetermined high level. It is detected that the length L3 has been reached.

  Here, although not particularly limited, the height L3 of the water level detected by energization between the longest electrode 58 and the shortest electrode 55 is higher than the drain discharge port 62. In general, the water level in the neutralizing device 51 does not reach this height L3. That is, the shortest electrode 55 detects the water level that has risen beyond the standard when the water level becomes very high due to the drain discharge port 62 becoming clogged. That is, the heat source apparatus 1 of the present embodiment can detect an unspecified water level rise in the neutralization device 51, and when the water level rises outside the standard, the controller 7 display and sound Notification can be made by appropriate notification means such as a generator.

  As shown in FIG. 7, the drain discharge pipe 53 is provided downstream of the neutralization device 51 in the drain flow direction in the drain discharge system 20, and includes a drain discharge port connected to the neutralization device 51 and the outside of the heat source unit 1. It is a pipe that connects That is, it is a pipe for discharging the drain discharged from the inside of the neutralizing device 51 to the outside of the heat source unit 1.

  By the way, in the neutralization apparatus 51 of this embodiment, as mentioned above, a water seal state is formed by letting a drain remain inside. Accordingly, the gas flow from the upstream side of the neutralizing device 51 to the downstream side of the neutralizing device 51 in the drain discharge system 20 can be prevented. Therefore, even if the combustion gas generated in the combustion unit 10 mistakenly enters the drain introduction pipe 50 from the drain recovery unit (not shown) and enters the drain discharge system 20, the neutralization device 51 It does not flow downstream.

  However, there is a sufficient amount of drain to form a water-sealed state in the neutralization device 51, such as during a trial operation that is performed immediately after the installation of the heat source unit 1 or when the heat source unit 1 is operated after maintenance is performed. May not exist. Therefore, in the heat source apparatus 1 of the present embodiment, when the heat source apparatus 1 is operated in such a state that there is no sufficient amount of drain inside the neutralizer 51 and a water seal state cannot be formed, a water seal state is formed. Therefore, a pouring operation for supplying hot water to the neutralizing device 51 is performed. The water injection operation of the present embodiment will be described in detail with reference to FIG.

  In the heat source device 1 of the present embodiment, the controller 7 or the internal base of the heat source device 1 in a state where the flow path is switched to the state where the three-way valve 43 is manually operated and the port 43a and the port 43b communicate with each other (step 1). When the water sealing to the neutralizing device 51 is instructed by pressing the switch (in the case of Yes in step 2), the supply of hot water to the neutralizing device 51 is started. Specifically, when the controller 7 or the internal base switch is pressed, it is confirmed by the signal transmitted from the contact switch 44 whether hot water is flowing from the bath dropping pipe 34 to the water injection pipe 52 or not. The hot water pouring operation is started when hot water is flowing into the water pouring pipe 52.

  When instructed to supply hot water to the neutralizer 51, the pouring electromagnetic valve 39 is opened (step 3). Then, hot water is supplied from a water supply source (not shown) to the bath dropping pipe 34 through the water inlet pipe 25 and the hot water outlet pipe 26. At this time, the flow rate of hot water supplied to the bath dropping pipe 34 is adjusted by the pouring electromagnetic valve 39, the hot water flow rate adjusting valve 30, and the bath flow rate sensor 38 (step 4). That is, based on the flow rate value detected by the bath flow sensor 38, the opening degree of the pouring solenoid valve 39 and the hot water flow rate adjustment valve 30 is controlled, and hot water of a predetermined flow rate flows into the bath dropping pipe 34. Although not particularly limited, it is desirable that the flow rate of hot water supplied to the bath dropping pipe 34 is controlled to be about 2.5 L / min.

  Thus, when hot water is supplied to the bath dropping pipe 34, the hot water supplied to the bath dropping pipe 34 flows into the neutralization device 51 through the water injection pipe 52. When hot water continues to be supplied to the neutralization device 51, the hot water level rises in the neutralization device 51.

  When the level of hot water in the neutralizing device 51 exceeds a certain level, that is, when hot water is supplied enough to form a water-sealed state inside the neutralizing device 51, it is attached to the neutralizing device 51. The drain contacts the formed electrodes 56 and 58. Specifically, as shown in FIG. 8, when the water level in the neutralizing device 51 rises to a predetermined height L2, and the water level in the neutralizing device 51 reaches a level that allows water sealing, the longest electrode 58 is obtained. And the third longest electrode 56. Thus, it is detected that the water level inside the neutralizing device 51 has reached the height L2 at which water sealing is possible.

  When it is detected that the water level in the neutralizing device 51 is equal to or higher than the predetermined height L2 (in the case of Yes in step 5), the pouring electromagnetic valve 39 is closed (step 6), Hot water supply is stopped. Then, the three-way valve 43 is operated to switch the flow path to a state where the port 43a and the port 43c are in communication (step 7). That is, the flow path is returned to a state in which hot water flows from the bath dropping pipe 34 to the bath return pipe 35. With this, the pouring operation is finished.

  Above, description about the water injection operation | movement of this embodiment is complete | finished.

  In the present embodiment, in a state where the port 43a and the port 43b communicate with each other, that is, in a state where hot water flows into the water injection pipe 52, the controller 7 or the like instructs to pour (drop) hot water into the bathtub 46. The error is notified by appropriate notification means such as a display of the controller 7.

  In the heat source unit 1 of the present embodiment, the hot water flowing through the bath dropping pipe 34 is supplied to the neutralization device 51, so that the fluctuation of the water pressure of the water supply source is the same as in the conventional configuration in which hot water is supplied from the inlet pipe to the neutralization device. Will not be affected by. Therefore, it is possible to supply an appropriate amount of hot water to the neutralizing device 51 with a simple configuration. In addition, by connecting the water injection pipe 52 branched from the bath dropping pipe 34 to the neutralization device 51 in this way, the connection of the water injection pipe 52 to the neutralization device 51 is not subject to regulations in the Water Supply Law. No special processing is required for the neutralizing device 51 for the connection of 52, and the degree of freedom in design can be improved.

  In addition, by supplying hot water flowing through the bath dropping pipe 34 to the neutralizing device 51 in this way, it is not necessary to provide a container such as a water injection bag for supplying hot water to the neutralizing device 51. As a result, it is not necessary to secure an area for installing a container such as a water injection bag inside the heat source unit 1, so that the size and shape of each member can be changed even when the volume inside the housing of the heat source unit is small. It can be built in the housing without doing it. In other words, there is an advantage that the internal structure can be reduced in size and the heat source device can be reduced in size.

  Furthermore, according to the heat source device of the present embodiment, as in the conventional case where a container such as a water injection bag is attached to the neutralization device, there is no need to install the water injection bag, water injection operation to the water injection bag, etc. There is an advantage that the burden on the installer can be reduced.

  In the heat source device 1 of the present embodiment, the hot water flow rate adjustment valve 30, the bath flow rate sensor 38, the pouring electromagnetic valve 39, and the backflow prevention device 40 are neutralized with the hot water pouring operation to the bathtub 46 by the bath system 4. It has a structure that can be shared with the water injection operation to the device 51. Therefore, it is not necessary to newly provide a hot water backflow prevention structure for the water injection operation to the neutralizing device 51, and there is an advantage that the manufacturing cost of the heat source unit 1 can be reduced.

  Moreover, in the heat source device 1 of this embodiment, it is the structure which can acquire the integrated amount of the hot water supplied to the neutralization apparatus 51 with the flow sensor 38 for baths. As a result, for example, even if the water draining stopper (not shown) for maintenance of the neutralizing device 51 is forgotten to be closed and the water injection operation is carried out in a state where hot water cannot be stored in the neutralizing device 51, hot water automatically It becomes possible to make it the structure which stops supply of this, or alert | reports to a user. More specifically, the supply of hot water is automatically stopped on the condition that the bath flow sensor 38 detects that a certain amount of hot water has been supplied to the neutralization device 51. , Can prevent running water from running down. Further, when it is detected that a certain amount of hot and cold water has been supplied to the neutralizing device 51, an error is reported when the water level detecting means of the neutralizing device 51 does not detect a water level above a predetermined level. With the configuration, it is possible to notify the user that hot water has not been supplied correctly.

  Moreover, in the heat source machine 1 of this embodiment, when it is detected that the water level in the neutralization apparatus 51 is more than a fixed level, the water injection operation to the neutralization apparatus 51 is automatically terminated. Therefore, when performing the water pouring operation to the neutralizing device 51, it is not necessary for the operator to completely fill the water pouring operation to the neutralizing device, and another work can be performed during the water pouring operation. Thereby, when performing the installation work and the maintenance work of the heat source machine 1, work efficiency can be improved.

  In addition, in the heat source device 1 of the present embodiment, the switching state of the flow path of the three-way valve 43 can be detected by the contact switch 44. Therefore, a malfunction that starts pouring hot water into the bathtub 46 when hot water flows to the water injection pipe 52, or a water pouring operation to the neutralizer 51 when hot water flows into the bathtub 46 is started. It is possible to reliably prevent malfunction. More specifically, when the hot water pouring operation to the bathtub 46 or the water pouring operation to the neutralizing device 51 is performed, the state of the flow path is detected, and an error is notified if the flow path state is incorrect. Or each operation can be stopped.

  In the above-described embodiment, when hot water is poured (dropped) into the bathtub 46 in a state where hot water flows into the water pouring pipe 52, an error is notified, but the present invention is limited to this. For example, it may be configured to automatically stop pouring hot water into the bath, and may be configured to notify an error and automatically stop pouring hot water into the bath.

  In the above-described embodiment, an example in which the manually operated three-way valve 43 is employed as the flow path switching means has been described, but the flow path switching means employed in the heat source apparatus of the present invention is not limited thereto. For example, a three-way valve that switches the flow path based on a signal transmitted from the controller 7 or the base, that is, an electrically operated three-way valve that operates automatically may be used. When such an electric valve is adopted, a predetermined port is automatically opened and closed based on the detected water level in the neutralizing device 51 by using the water level detecting means of the neutralizing device 51. Therefore, the water injection operation to the neutralizing device 51 can be performed automatically. The flow path switching means is not limited to a three-way valve, and may be formed by combining two two-way valves.

  In the above-described embodiment, the example in which the switching state of the flow path by the three-way valve 43 is detected by detecting the handle position of the three-way valve 43 by the contact switch 44 is shown, but the present invention is not limited to this. The contact switch 44 may detect the switching state of the flow path by the three-way valve by a method such as detecting the position of an appropriate part such as a three-way valve, a cock, or a limiter. When a three-way valve that operates automatically is employed, a sensor that is built in the three-way valve and detects the switching state of the flow path may be used.

In the above-described embodiment, the example in which the check valve 41 and the check valve 42 are used together as the backflow prevention device 40 has been described. However, the embodiment is not limited thereto. For example, a hopper device may be adopted as the backflow prevention device. That is, a storage device (water storage tank) is provided, hot water poured from the upstream side is temporarily stored in the storage device, and hot water stored in the storage device is caused to flow downstream from a pipe connected to the storage device. It may be a configuration.
Moreover, the structure which connects the water injection pipe for supplying hot water to a neutralization apparatus at this time to a storage apparatus may be sufficient. That is, the water injection pipe only needs to be provided between any part of the bath dropping system and the neutralization device, and the connection position of the water injection pipe is not limited to the bath dropping pipe.

In the above-described embodiment, an example of a water injection operation for stopping water supply is shown on the condition that the water level of the neutralizing device 51 has reached a predetermined height L2 (see FIG. 8) by the water level detecting means of the neutralizing device 51. However, the water injection operation of the present invention is not limited to this. For example, the bath flow sensor 38 may perform a water injection operation for stopping water supply on the condition that the accumulated amount of hot water supplied to the neutralization device 51 becomes a predetermined amount.
The water injection operation will be specifically described. The water injection operation is started, and the water level in the neutralizing device 51 has reached a predetermined height L1 (a height lower than the target height L2). When detected by the water level detection means of the summing device 51, the supply of hot water by the bath flow sensor 38 is started. Then, the water injection operation is stopped on the condition that a predetermined amount of hot water is supplied to the neutralization device 51 from the state where the water level of the neutralization device 51 reaches the predetermined height L1. In the heat source machine of the present invention, hot water can be supplied to the neutralizing device 51 even in such a water injection operation.

  In the above-described embodiment, the neutralization device 51 having the function of the water sealing device, that is, the example in which the configuration in which the water sealing device and the neutralization device are integrally formed is shown. This is not a limitation. For example, the structure which provided the neutralization apparatus and the water sealing apparatus separately may be sufficient. That is, in the drain discharge system, a water sealing device such as a so-called drain trap is provided by bending a pipe into an appropriate shape such as a substantially “S” shape, and such a water sealing device is provided upstream of the neutralization device. The water injection pipe may be connected to the water sealing device (or the upstream side of the water sealing device). That is, any structure may be used as long as water can be injected from a water injection pipe branched from the bath dropping system into the water sealing device formed in the drain discharge system.

  In the above-described embodiment, the example in which the flow rate of hot water supplied to the water injection pipe 52 is controlled by the hot water flow rate adjustment valve 30, the bath flow rate sensor 38, and the like has been described, but the heat source device of the present invention is not limited to this. Absent. For example, the water injection pipe may be provided with a flow rate adjusting means such as an orifice so that an appropriate amount of hot water can be supplied to the water seal device. In the case of such a configuration, it is not always necessary to provide a valve having a flow rate adjusting function on a pipe (a bath dropping pipe or the like) located upstream of the water injection pipe, and a configuration in which a switching valve having no flow rate adjusting function is provided. There may be.

1 Heat source machine 6 Bath dropping system 15 Burner 18 Secondary heat exchanger (heat exchanger)
20 Drain discharge system 34 Bath drop pipe 40 Backflow prevention device (backflow prevention means)
43 Three-way valve (flow path switching means)
44 Contact switch (flow path detection means)
51 Neutralizing device (water sealing device)
52 Water injection pipe

Claims (6)

A heat source machine comprising a burner that burns fuel and a heat exchanger that mainly recovers latent heat of combustion gas generated by the operation of the burner,
A bath dropping system for dropping hot water into the bathtub, and a drain discharge system for neutralizing the drain generated in the heat exchanger and discharging it to the outside,
The drain discharge system is provided with a water seal device that blocks the flow of gas from the upstream side to the downstream side,
A heat source machine, wherein a water injection pipe branched from a bath dropping system is continuous with the water sealing device and / or an upstream portion of the water sealing device. The bath dropping system includes backflow prevention means for preventing the flow of hot water from the downstream side to the upstream side,
The heat source apparatus according to claim 1, wherein a branch portion where a bath dropping pipe forming a part of a bath dropping system and the water injection pipe intersect is located downstream of the backflow preventing means.   The branch portion where the water injection pipe branches is provided with a flow path switching means capable of switching between a state in which hot water can be poured into the bathtub side and a state in which hot water can be poured into the water sealing device side. The heat source machine according to claim 1 or 2, characterized in that.   At the branching portion where the water injection pipe branches, there is a flow path detecting means capable of detecting whether the hot water can be poured into the bathtub side or the hot water can be poured into the water sealing device side. The heat source apparatus according to claim 3, wherein the heat source apparatus is provided.   5. The heat source device according to claim 4, wherein the flow path detection unit performs water injection to the water sealing device on condition that the flow detection unit detects that hot water can be injected to the water sealing device side. . The water sealing device is formed integrally with a neutralization device for neutralizing and discharging drain, and has water level detection means for detecting the level of internal drain and / or hot water,
The heat source apparatus according to claim 4 or 5, wherein water injection to the water sealing device is stopped on condition that the water level inside the water sealing device is detected to be equal to or higher than a predetermined water level.

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