JPH10300208A - Combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid such a situation as hot water of unnecessarily high temperature is supplied entirely and quickly when a possibility thereof is present. SOLUTION: The combustor comprises a heat-exchanger 13 being heated by a burner 15 and coupled with the heat receiving tube 30a of a hot water supply system wherein the heat receiving tube is coupled, at one end thereof, with a water supply tube 31 and, at the other end thereof, with a hot water supply tube 32. The combustor further comprises a bypath means 34 coupling the water supply tube and the hot water supply tube, a bypass valve 38 provided in the bypath, and means 46 for detecting abnormality by monitoring the operating state of an apparatus, and a control means 18 for operating the bypass valve 38 in the opening direction based on an abnormality detected by the abnormality detecting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a combustion apparatus in which a heat receiving pipe of a hot water supply system and a heat receiving pipe of another system are heated by a common heat exchanger.

[0002]

2. Description of the Related Art A combustion device such as a single-can double-channel water heater in which a heat receiving pipe of a hot water supply system and a heat receiving pipe of another system are heated by a common heat exchanger is provided in one can. A common heat exchanger and a burner are accommodated, and a plurality of heat receiving tubes are passed through the heat exchanger. Thus, the combustion section is made compact, and the size of the appliance is reduced.

In such a combustion apparatus, for example, one of the plurality of systems is configured as a hot water supply system, and a water supply pipe is provided at one end of the heat receiving pipe so that water can be supplied, and the other end is provided at the other end. Is connected to a hot water supply pipe so that heated hot water can be discharged. The other system is configured as, for example, a bath system or a reheating system composed of a circulation pipe connected to a bath tub.

In the combustion apparatus having such a configuration, at the time of reheating, a pump provided in the reheating system is driven to circulate water in the bathtub, and the above-described burner is burned to exchange heat and boil the bath. ing. In the case of the combustion device, the burner is burned and the hot water is discharged from the hot water supply pipe of the hot water supply system.

[0005] In such a combustion apparatus, both the heat receiving pipe of the hot water supply system and the heat receiving pipe of the additional heating system are inserted into a common heat exchanger heated by a burner. For this reason, during the additional heating, the hot water staying in the heat receiving pipe of the hot water supply system is also heated by receiving the combustion heat of the burner. Therefore, if hot water is discharged during the additional heating or immediately after the additional heating operation, very high-temperature hot water may be discharged.

On the other hand, in the hot water supply bath disclosed in Japanese Patent Publication No. 1-28300, a temperature sensor is disposed in a heat receiving pipe of a hot water supply system, and combustion is performed by feedback control based on the temperature detected by the temperature sensor. It adjusts the fuel input of the burner in some sections, and performs ignition and fire extinguishing.

[0007]

However, when only such a combustion section is adjusted, sufficient time is required for the heat exchanger to cool down, and hot water is discharged when the user suddenly operates the appliance. It is not a hot water measure. For this reason,
With respect to tapping of such high-temperature hot water, a means that can respond promptly has been desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and there is provided a combustion apparatus capable of quickly avoiding such a situation in any case where hot water may be unnecessarily discharged. The purpose is to provide.

[0009]

According to the present invention, there is provided, in accordance with the present invention, a heat receiving pipe for a hot water supply system passing through a heat exchanger heated by a burner. A hot water supply pipe is connected to each of the combustion apparatuses, wherein a bypass means for connecting the water supply pipe to the hot water supply pipe, a bypass valve provided in the bypass, and an operating state of the appliance are monitored to detect an abnormality. The present invention is attained by a combustion device comprising: abnormality detection means; and control means for operating the bypass valve in an opening direction based on abnormality detection by the abnormality detection means.

[0010] Further, according to the present invention, according to the present invention, a heat receiving pipe of a hot water supply system and a heat receiving pipe of another system are passed through a common heat exchanger heated by a burner. A combustion device in which a water supply pipe is connected to one end and a hot water supply pipe is connected to the other end, wherein bypass means for connecting the water supply pipe and the hot water supply pipe; a bypass valve provided in the bypass; Abnormality detection means for monitoring abnormality of the bypass valve, and control means for operating the bypass valve in the opening direction based on the abnormality detection by the abnormality detection means.

According to the above configuration, the abnormality detecting means for monitoring the operating state of the appliance monitors the operating state of the combustion device at all times or by interrupt processing as required in the operation mode. As a result of this detection, the processing is performed by the control unit, and when the control unit determines that there is a possibility that hot water may be discharged from the hot water supply pipe and it is dangerous, the control unit opens the bypass valve of the bypass unit in a direction in which the hot water is opened. To control. As a result, water from the water supply pipe immediately enters the hot water supply pipe,
The hot water is mixed with the hot water in the hot water supply pipe, and the hot water whose temperature has dropped is discharged.

Further, the heat-receiving pipe of the other system may be a heat-receiving pipe of a bath system interposed between the heat-receiving pipe and the bathtub.

Further, when the burner is burned and water is supplied to the heat receiving pipe of the hot water supply system during the hot water supply operation, the bypass valve is operated in the opening direction based on the abnormality detection by the abnormality detection means. It is also possible to adopt a configuration having a control means for performing the control.

Further, when the burner is burned and hot water in a bathtub is drawn into the heat receiving tube of the bath system to perform a reheating operation, based on the abnormality detection by the abnormality detecting means,
You may comprise so that it may have the control means which operates the said bypass valve in an opening direction.

Further, the control means may drive a fan provided in connection with a combustion section including the burner after operating the bypass valve in an opening direction.

Further, the control means may continue the operation of the appliance after operating the bypass valve in the opening direction.

Further, the control means displays a necessary error when an abnormality is detected in the appliance based on the abnormality detection by the abnormality detection means, and continues the opening direction operation of the bypass valve. You may.

Further, the control means, based on the detection of the abnormality by the abnormality detection means, operates the bypass valve in the opening direction and then stops the operation of the appliance, based on the history of occurrence of the abnormality. Thus, at the start of the next appliance operation, the opening operation of the bypass valve may be continued.

[0019]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiments described below are preferred examples of the present invention, and therefore, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 is a system diagram showing a main configuration of an embodiment of a combustion apparatus according to the present invention. In this figure, a combustion apparatus 10 has a single can (an inner body of a heat exchanger) containing one or a plurality of burners and a heat exchanger, and the heat exchanger has a water supply system and a reheating system. 1 shows an example of a one-can two-canal combustion device through which water flows.

The combustion device 10 has one heat exchanger 13 in a can 11. A combustion section 12 is provided below the heat exchanger 13, and the combustion section 12 is provided with one burner 15. The burner 15 is connected to a supply pipe 15a for fuel gas drawn from the outside, and the gas supply pipe 15a is connected to a main electromagnetic on-off valve 22 and an electromagnetic proportional valve 21. Thereby, the main electromagnetic opening / closing valve 22 is opened, the fuel gas is drawn in from the outside, and the supply amount of the fuel gas is adjusted by the electromagnetic proportional valve 21. Note that the burner 15 may have a plurality of switching combustion surfaces and perform combustion switching according to the required amount of heat. A burner of a hot water supply system and a burner of a supplementary heating system are separately prepared, and one heat exchanger is provided. It may be provided in connection with.

An electric fan 17 for sending combustion air is arranged below the burner 15. An igniter (not shown) serving as ignition means, a frame rod 16 for checking combustion, and the like are provided near the flame opening of the burner 15. The end of the frame rod 16 is arranged in a combustion flame,
During combustion, the flame current is detected.

One heat exchanger 13 is disposed above the burner 15, and the exhaust passage 4 is disposed above the heat exchanger 13.
8 are provided. As a result, the heat exchanger 13 is heated by the combustion of the burner 15, and the exhaust gas is discharged to the exhaust passage 48.
Is led to the outside via the. Heat exchanger 1
3 is provided with a number of fins 14, and a heat receiving pipe 30a of a hot water supply system and a heat receiving pipe 50a of a reheating system (bath system) are arranged so as to penetrate the fins. Thereby, each of the heat receiving tubes 30a and 50a is connected to one heat exchanger 1 at the same time.
3 to be heated. Further, a temperature fuse 47 is arranged near the heat exchanger 13 so that when the temperature of the heat exchanger 13 rises to an abnormally high temperature, the fuse 47 is blown. As a result, the power supply to the wiring connected to the thermal fuse 47 is cut off and detected by the control device 18 described later.

A circulation line 51 for additional heating provided between the heat receiving tube 50a of the additional heating system and the circulation fitting 58 of the bathtub 57 is connected. Specifically, the heat receiving tube 50
The return pipe 52 of the reheating pipe line 51 is provided at one end side (entrance side) of a.
However, the outgoing pipe 53 of the additional heating pipe 51 is connected to the other end (outside), so as to constitute a circulation pipe as a whole.

A return pipe 52 for drawing water from a bathtub 57 has a bath flow sensor 56 for detecting running water,
A bath thermistor 55 for detecting the temperature of the hot water in the bathtub and a circulation pump 54 for drawing water from the bathtub 57 are provided. Further, a pressure sensor (not shown) is provided at a predetermined position of the reheating line 51 or the branch line 42.
7 can be detected.

On the other hand, the hot water supply system 30 has a heat receiving tube 3
Water supply pipe 3 for drawing water from outside into one end (entrance side) of Oa
1 is connected, and a hot water supply pipe 32 for discharging heated hot water is connected to the other end side (outlet side). Water supply pipe 31
A flow sensor 35 for detecting the presence and amount of water flow guided from the outside, a water amount control valve 36 composed of, for example, a gear motor described later, and a water input thermistor 37 for detecting the temperature of the introduced water. It is connected. In the vicinity of the heat exchanger 13 in the middle of the heat receiving pipe 30a of the hot water supply system,
A first thermistor 44 as a temperature detecting means is attached.

Further, the heat exchanger 1 is connected to the heat receiving tube 30a.
A second thermistor 39 is connected to the hot water supply pipe 32 that is connected to a position outside the hot water supply pipe 3. Further, a bypass means 34 is provided by branching a portion of the water supply pipe 31 downstream of the flow sensor 35 and upstream of the water amount control valve 36 and connecting a point of the hot water supply pipe 32 downstream of the second thermistor 39. I have. The bypass means 34 is provided with a bypass valve 38 for varying the bypass flow rate. The bypass valve 38 is controlled by, for example, a gear motor as described later. Further, a fixed bypass 33 is provided which branches the downstream of the water supply thermistor 37 of the water supply pipe 31 and connects the upstream of the second thermistor 39 of the hot water supply pipe 32 and does not change the flow rate.

Further, a third thermistor 41 is provided downstream of the connection point of the hot water supply pipe 32 with the bypass means 34. Further, the hot water supply pipe 32 is provided with a third thermistor 3.
One end of a branch pipe (pouring pipe) 42 is connected by branching downstream from the pipe 9, and the other end of the branch pipe 42 is connected downstream of the pump 54 of the above-described additional heating line 51.
A pouring solenoid valve 43 is set in the branch pipe 42.

The bypass valve 38 may be configured to be driven by a gear motor as shown in FIG. 3, for example. In the figure, a valve port 62 provided in the bypass pipe 34
Is opened and closed by a valve body 61 movable in one direction. The valve body 61 is connected to a motor 64 via a gear train 63 and moves with the rotation of the motor 64. The movable portion of the gear train 63 is provided with a potentiometer 65. As a result, a signal from the potentiometer 65 is sent to the control device 18 described later, so that the control device 18 can detect the opening degree of the bypass valve 38 at that time.

Further, the combustion device 10 is provided with a control device 18 as a control unit, for example, a control unit. The control device 18 is configured as, for example, a control board of the combustion device 10. The control device 18 is connected to a recoat control device (hereinafter, referred to as a “remote controller”) 19, controls the hot water supply system 30 so as to reach a set temperature set by a user via the remote controller, and controls the water level to a set water level. This is a control means for performing a so-called automatic operation in which the bathtub 57 is filled with water so as to form a bath and controls the reheating system 50 so as to reheat the bath to a set temperature. In addition, the remote controller 19 is provided with an error display section 19a for displaying a predetermined error when, for example, driving the appliance. Error display section 19a
When an error occurs, the content of the error is displayed by a predetermined error number or character display, or a display lamp to that effect is blinked by an instruction of the control device 18. The error display may be performed by sounding an alarm buzzer.

As shown in FIG. 2, the control unit 18
Is connected to the combustion unit 12. The combustion unit 12 includes an ignition means for the burner 15 described above, a proportional valve 21 for supplying fuel gas to the burner 15, an on-off valve 22, and the like, and further includes a means for controlling combustion such as a pressure sensor (not shown). In.

The control device 18 includes an electric fan 17 for sending air for combustion to the combustion section, a bypass valve 38 for adjusting the flow rate of bypass means, a water amount control valve 36 for adjusting the amount of water supplied to a water supply pipe, and a branch pipe. A pouring solenoid valve 42 for opening / closing 42 is connected. Furthermore, in the present embodiment, an abnormality detection unit 46 is connected to the control device 18. The abnormality detector 46 also serves as a monitor for performing various detections required when the combustion device 10 is automatically operated. In other words, the abnormality detection unit 46 is one of the detection means, the one-can-two-channel-type combustion device 10 as in the present embodiment.
In this operation, for example, when hot water is discharged from the hot water supply pipe 32 and there is a possibility that the user is in danger, this is a means for detecting in advance.

Therefore, any monitoring means such as a sensor attached to the hot water supply device 10 for various purposes, which detects that there is a possibility that hot water can be discharged from the hot water supply pipe 32, causes all of these abnormalities. Included in the detector.
Specifically, in the case of the combustion device 10 of this embodiment,
The abnormality detecting section 46 includes a temperature fuse 47, an incoming water thermistor 37, a first thermistor 44, and a second thermistor 3.
9, monitoring means such as a third thermistor 41, a frame rod 16, a bath thermistor (additional heating thermistor) 55, and the like.

The detection result of each monitor means included in the abnormality detecting section 46 is sent to the control device 18. Based on the detection result, control device 18 sets this as an “abnormal error”, and drives bypass valve 38 in the opening direction as described later, so that hot water in hot water supply pipe 3 and water in bypass means 34 are removed. , And the temperature is quickly lowered. Therefore, it is determined whether or not the detection result of each monitor means leads to the possibility that the hot water is discharged from the hot water supply pipe 32 and the user is in danger, that is, whether or not an “abnormal error” should be made. You may decide at 18
The function of making the determination may be provided in the abnormality detection unit 46, and an error signal may be sent to the control device 18. Also,
Such a determination can be stored in the memory 59. And, preferably,
The memory 59 is constituted by a non-volatile memory so as to retain the above-mentioned memory even if the power of the combustion apparatus 10 is turned off by the remote controller 19 or the like or an error is reset.

According to the present embodiment, the combustion apparatus 10 is configured as described above, and operates as follows. First, the hot water supply operation will be briefly described. When the user turns on the power of the remote controller 19 and opens the hot water tap (not shown) of the hot water supply pipe 32, water is supplied to the water supply pipe 31 from the outside, and the flow sensor 35 detects this and sends a signal to the control device 18. . The control device 18 issues an instruction to the combustion unit 12 and issues a command
The fuel is introduced into the burner 15 by instructing each of the solenoid valve 2 and the proportional solenoid valve 21, and combustion is started using an ignition means such as an igniter (not shown). The flame rod 16 detects a flame current in the combustion flame, and confirms ignition and monitors the state of continued combustion.

The fins 14 of the heat exchanger 13 are heated by the combustion of the burner 15, and this heat is exchanged with the water flowing from the water supply pipe 31 to the heat receiving pipe 30 a, and is discharged through the hot water supply pipe 32. Further, the incoming water thermistor 37 detects the incoming water temperature introduced from the outside, and the first thermistor 44 detects the temperature of the stagnant water in the heat receiving pipe 30 a in the heat exchanger 13. The second thermistor 39 detects the temperature of the hot water in the hot water supply pipe on the outlet side of the heat exchanger 13, and the third thermistor 41 monitors the actual hot water temperature after mixing by the bypass means.

Accordingly, the controller 18 detects the total amount of water taken in by the water amount control valve 36 while observing the detection result of the flow sensor 35. The control device 18 monitors the incoming water temperature by the incoming water thermistor 37, obtains the number of combustion and fuel supply amount required for heating to the temperature set by the remote controller 19 by a predetermined calculation, and controls the combustion. . Then, the control device 18 detects the temperature of the hot water coming out of the heat exchanger 13 by the second thermistor 39, adjusts the bypass valve 38 to determine the bypass flow rate, and controls the heated hot water and the bypass means. The water flow control valve 36 and the bypass valve 38 are determined so that the flow rate of water passing through the third thermistor 41 is determined so that the hot water temperature detected by the third thermistor 41 matches the set temperature.
And the mixing is performed so as to obtain an appropriate flow rate ratio. The control device 18 obtains the detection results of the first thermistor 44 and / or the second thermistor 39 and compares them, for example, to determine the state of heat retention in the heat exchanger 13, that is, the post-boiling state. You can know.

In the case of additional heating, the remote controller 19 is used.
When the user gives an instruction for additional heating via, the control device 18 drives the additional heating pump 54 to draw water from the bathtub 57 into the additional heating conduit 51. The controller 18 confirms the signal of the flow sensor 56, performs the above-described ignition operation, draws the bathtub water into the additional heating pipe line 51, and heat-exchanges the water in the heat receiving pipe 50a while circulating the pump. Table 13
Heat with. At this time, the control device 18 causes the combustion section 12 to stop burning the burner 15 when the temperature detected by the first thermistor 37 reaches, for example, 75 ° C., and restarts the combustion when the temperature falls below 70 ° C. I have to. Such intermittent combustion is performed because the heat receiving tubes 50a
This is because reheating is performed in a short time while preventing the hot water staying in the tank from boiling. When the temperature detected by the bath thermistor 55 reaches the set temperature instructed via the remote controller 19, the reheating is completed.

In the automatic operation in a state where the bathtub is not filled with water, the pouring solenoid valve 43 of the branch pipe 42 is opened and the burner 1 is opened.
While burning 5, hot water is introduced from the hot water supply pipe 32 into the reheating pipe line 51, introduced into the bathtub from the circulation fitting 58 and filled with water, and then the reheating operation is performed to boil the water. To In addition, the hot water supply operation and the reheating operation can be performed simultaneously.

Further, in connection with the above-mentioned hot water supply operation, the water supply control valve 36 and the bypass valve 38 take four operation modes as shown in FIG. The flow ratio control between the pipe 31 and the hot water supply pipe 32 is performed.

Mode 1 is basically a case where the hot water staying in the hot water supply system heat receiving pipe 30a in the heat exchanger 13 is at a high temperature and is in a so-called post-boiling state.
In this case, when there is a request for the hot water supply operation, the hot water supply pipe 3
It is necessary to immediately supply a large amount of water for mixing from the bypass means 34 to the high-temperature hot water flowing through the hot water 2. For this reason, the opening degree of the water amount control valve 13 and the opening degree of the bypass valve 38 are determined by the following equation.
It is set to be 70. As this case, for example, there is the following case. When the additional heating operation and the hot water supply operation are performed at the same time and stopped. This is after the hot water supply is stopped and the reheating operation is started. In this case, the hot water staying in the heat receiving pipe 30a in the heat exchanger 13 is heated in the staying state for a long time by the additional heating. When the operation switch of the remote controller 19 is turned on, at least one of the first thermistor 44 and the second thermistor 39 being monitored is
When the temperature is determined to be after boiling (for example, 50 ° C. or higher). This is mainly due to the hot water supply pipe 32 and the bypass means 3
This is a case where the hot water supply operation is stopped during the mixing of No. 4.

Mode 2 is a state in which, for example, the bypass valve 38 is driven to the full in the closing direction. At this time, since only the fixed bypass 33 flows, the flow ratio is controlled such that, for example, the hot water supply pipe side flow rate: the bypass unit side total flow rate becomes 70:30. This is performed, for example, in the following operating state. Both the first thermistor 44 and the second thermistor 39 are at a temperature lower than the temperature determined to be post-boiling (for example, 5
(Less than 0 degree C). After the reheating operation, the fan 17 is driven according to a predetermined operation flow. In this case, since the heat exchanger 13 is cooled by driving the fan, there is almost no fear of post-boiling. Thus, in this mode 2, the apparatus is in a standby state in order to efficiently perform hot water supply combustion in preparation for the next hot water supply operation.

Mode 3 is a state in which mixing control for discharging hot water at a set temperature is being performed in accordance with an instruction from the control device 18 during the normal hot water supply operation. A transition is made from mode 1 or mode 2 to mode 3. Hot water supply pipe side flow rate: Bypass means side total flow rate is indefinite,
The opening of the water amount control valve 13 and the opening of the bypass valve 38 are changed according to the change of the hot water temperature, the incoming water temperature, the combustion amount, etc. of the hot water supply pipe 32.

Mode 4 is a state in which the bypass valve 38 is driven to the full in the opening direction. In this case, for example, the hot water supply pipe side flow rate: the bypass section side total flow rate is set to 45:55 including the fixed bypass invariable flow rate. Mode 4 is basically an operation mode in which, for example, the operation state shifts from the operation states of modes 1 to 3 when the operation is stopped. Therefore, mode 4 is basically a mode in which the opening of the water flow control valve 13 and the opening of the bypass valve 38 are set to the reference position. In this embodiment, the fully open position is set to the reference position. is there. In comparison with mode 1, mode 1 is such that the flow rate on the hot water supply pipe side: the total flow rate on the bypass means side is 3
The flow ratio is 0:70, and the flow ratio on the bypass means side can be received as being smaller in mode 4. However, in Mode 1, as a result of moving the water flow control valve 13 and the bypass valve 38 in the closing direction in the movable range thereof, the flow ratio between the two becomes such a value. , The bypass valve 38 is controlled to open completely, so that the absolute flow rate on the bypass means side is
Mode 4 is larger. Therefore, this combustion device 1
In the case of 0, when the abnormality detecting unit 46 detects an abnormality of the appliance related to tapping of the hot water,
In any of the states 2 and 3, the bypass valve 38 is opened to set, for example, the mode 4 state.

Next, an example of abnormality detection and bypass valve control of the combustion device 10 of the present embodiment will be described with reference to the flowchart of FIG. In the figure, when the user turns on a switch of a desired operation mode such as a reheating operation, an automatic operation, a hot water supply operation, or the like on the remote controller 19 of the combustion device 10, the operation of the initial mode corresponding to each operation type is started, and the operation described above is started. The burner 15 is ignited by a procedure (ST
1).

Subsequently, some or all of the monitoring means of the abnormality detecting section connected to the control device 18 immediately send the detection result of the corresponding portion in the initial mode operation to the control device 18 (ST2). Further, prior to or immediately after this, it is checked by referring to the memory 59 whether or not there is an error occurrence history described later during the previous operation. Here, based on the detection result from each monitor means, when the control device 18 detects an abnormality of the appliance and / or when an error is recorded, an error display is performed by the error display section 19a (ST4). ). Here, the control device 18 may refer to the data stored in the memory 59 in advance according to the type of error that has occurred, and hot water may flow out of the hot water supply pipe.
If it is determined to be dangerous, that is, if the state is equal to the above-mentioned post-boil state, the process proceeds to step 5.

In step 5, the control device 18 drives the motor 64 of the bypass valve 38 to control it in the fully open direction, for example, so as to correspond to mode 4 described above.
Then, the control device 18 receives the signal of the potentiometer 65 and checks whether or not the water amount control valve 36 and the bypass valve 38 have the opening corresponding to, for example, the mode 4 described above. Accordingly, a large amount of water for mixing can be immediately supplied from the bypass means 34 to the high-temperature hot water flowing through the hot water supply pipe 32. As a result of the mixing from the hot water supply pipe 32 according to the hot water supply request, Hot water heated to an appropriate temperature is supplied. In addition, the bypass valves 38 do not always need to be controlled to be opened, but need only be opened to obtain a required bypass flow rate. In this case, in order to check the opening degree of the bypass valve, not only the potentiometer described above, but instead of this, for example, the control device 18 sends a bypass valve opening command and a predetermined time elapses. This may be known by counting using a timer built in the control device 18 (not shown). Further, the position of the valve element may be detected using a Hall IC or the like, and the valve element may be driven until a predetermined open position is detected. These means may be used in an appropriate combination. Further, the control device 18 stores, in the memory 59, a history indicating that the bypass valve 38 has been controlled to open in response to the occurrence of the error.

Next, the control device 18 determines whether or not the instructed operation can be continued according to the type of the error (ST6). That is, for example, in the case of an error related to the thermal fuse 47 in FIGS. 1 and 2, the thermal fuse 13 may be blown or may have failed due to overheating of the heat exchanger 13. In such a case, since the thermal fuse 47 must be replaced, the process proceeds to step 7, and the operation in the initial mode is stopped. In this case, the error display in ST4 is performed and the operation of the appliance is stopped. Further, at this stage, the control device 18 determines whether the bypass valve 38
May be stored in the non-volatile memory 59 (ST10). Also, in the case of an error related to the frame rod 16, if there is an abnormality in any part of the combustion section 12 including the ignition means, or if the flame rod itself fails, the operation cannot be continued.

On the other hand, when it is determined in ST6 that the operation can be continued, there are the following cases. As shown in FIG. 2, an abnormality based on the detection results of the first to third thermistors 37, 44, 39, and 41 as the temperature detecting means causes each operation corresponding to any one of the modes 1 to 3 to be performed. If this occurs, the heat exchanger 13
It can be determined that the hot water staying in the heat receiving pipe 30a in the inside is after boiling. In such a case, or when an error is displayed based on the detection result of the additional heating (bath) thermistor 55,
If the heat exchanger 13 falls to a predetermined temperature, the operation can be continued. When it is determined that the continuation of the operation is possible, the process proceeds to step 8, and the control device 18 preferably issues a command to the electric fan 17 to drive the electric fan 17 and blow the heat to the heat exchanger 13. Thereby, the temperature of the heat exchanger 13 can be quickly lowered (ST
8).

Thus, the operation can be resumed in a short time (ST9), and thereafter, a full-scale operation for continuing the specified type of operation (additional heating, hot water supply, simultaneous operation, etc.) can be started. . In addition, the monitoring in step 2 can be interrupted in the middle of the continued driving to check the abnormality of the appliance at all times. From the start of the driving, during the continuation, the safe driving can be surely performed. it can. Furthermore, by checking the history of abnormal errors, safe operation can be reliably performed even after the operation is stopped and the next operation is restarted.

FIGS. 6 and 7 show another embodiment of the bypass valve 34. In these figures, the portions denoted by the same reference numerals as those in the embodiments of FIGS. 1 and 3 have the same configuration, and thus the duplicated description will be omitted, and the description will be focused on the differences. In this embodiment, a bypass valve 138 is set at the intersection of the bypass means 34 and the hot water supply pipe 32.

In the figure, a bypass valve 138 is disposed between a valve port 262 disposed between the bypass means 34 and the downstream side 133 of the hot water supply pipe 32, and between an upstream side 132 and a downstream side 133 of the hot water supply pipe 32. The valve port 162 is provided. These valve ports 162, 262 have two valve elements 161,
162 are provided correspondingly. Thereby, in the bypass valve 138, when the valve bodies 161 and 162 are shifted to the leftmost, the upstream side 132 and the downstream side
33, and the bypass means 34 communicates with the downstream side 133 of the hot water supply pipe. When the valve bodies 161 and 162 are moved to the rightmost positions, the bypass means 34 is shut off, and the upstream side 132 and the downstream side 133 of the hot water supply pipe 32 are communicated. When the valve bodies 161 and 162 are at the intermediate position, both passages are open. The bypass valve is not limited to these embodiments, and various valves can be adopted as long as the degree of opening and closing can be adjusted and the degree of opening and closing can be detected.

Further, in the above-described embodiment, the one-can two-channel combustion device has been described. However, the abnormality detection means of the present invention and the control of the bypass valve are not limited to this. Needless to say, the present invention can be applied to a combustion device such as a two-can multiple water channel.

[0054]

As described above, according to the present invention, there is provided a combustion apparatus capable of quickly avoiding such a situation in any case where hot water may unnecessarily flow out. be able to.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a main configuration of an embodiment of a combustion device according to the present invention.

FIG. 2 is a block diagram showing a main configuration of a control device of the combustion device of the present embodiment.

FIG. 3 is a diagram showing a first embodiment of a configuration of a bypass valve of the combustion device of FIG. 1;

FIG. 4 is a diagram for explaining a control mode of a bypass valve of the combustion device of the present embodiment.

FIG. 5 is a flowchart illustrating an example of bypass valve control of the combustion device according to the present embodiment.

FIG. 6 is a main part view showing another embodiment of the configuration of the hot water supply system of the combustion apparatus of the present invention.

FIG. 7 is a schematic diagram corresponding to FIG. 6, showing a configuration example of a bypass valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Combustion device 12 Combustion part 13 Heat exchanger 14 Fin 15 Burner 16 Flame rod 17 Combustion fan 18 Control device 19 Remote control 30 Hot water supply system 30a Heat receiving pipe 31 Water supply pipe 32 Hot water pipe 33 Fixed bypass 34 Bypass means 35 Flow sensor 36 Water volume control valve 37 Inlet thermistor 38 Bypass valve 39 Second thermistor 41 Third thermistor 42 Branch pipe 43 Pouring solenoid valve 44 First thermistor 50 Additional heating system (bath system) 51 Additional heating line (circulation line) 52 Return line 53 Outgoing pipe 54 Circulation pump 55 Additional heating thermistor (bath thermistor) 56 Additional heating flow sensor 57 Bathtub

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[Procedure amendment]

[Submission date] May 21, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG. 3

FIG. 7

FIG.

FIG. 2

FIG. 4

FIG. 5

FIG. 6

Continued on the front page (72) Inventor Kikuo Okamoto 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Inside Gaster Co., Ltd.

Claims (9)

[Claims] 1. A heat receiving pipe of a hot water supply system is passed through a heat exchanger heated by a burner, and a water supply pipe is provided at one end of the heat receiving pipe.
A combustion device in which a hot water supply pipe is connected to the other end, wherein a bypass means for connecting the water supply pipe and the hot water supply pipe, and an operation state of a bypass valve and an appliance provided in the bypass means are monitored to detect an abnormality. A combustion device, comprising: abnormality detection means for detecting; and control means for operating the bypass valve in an opening direction based on abnormality detection by the abnormality detection means. 2. A heat receiving pipe of a hot water supply system and a heat receiving pipe of another system pass through a common heat exchanger heated by a burner, and a water supply pipe is provided at one end of the heat receiving pipe of the hot water supply system and a hot water supply pipe is provided at the other end. A combustion device to which pipes are respectively connected, a bypass means for connecting the water supply pipe and the hot water supply pipe, an abnormality detection for monitoring an operation state of a bypass valve and an instrument provided in the bypass means and detecting an abnormality. Means for controlling the operation of the bypass valve in the opening direction based on the abnormality detection by the abnormality detection means. 3. The combustion apparatus according to claim 2, wherein the heat receiving tube of the other system is a heat receiving tube of a reheating system interposed between the heat receiving tube and the bathtub. 4. When the burner is burned and water is supplied to a heat receiving pipe of the hot water supply system during a hot water supply operation, the bypass valve is operated in an opening direction based on the abnormality detection by the abnormality detection means. 4. The combustion apparatus according to claim 3, further comprising control means for causing the combustion apparatus to perform the control. 5. When the burner is burned and hot water in a bathtub is drawn into the heat receiving tube of the additional heating system and the additional heating operation is performed, the bypass valve is controlled based on the abnormality detection by the abnormality detecting means. The combustion device according to claim 3, further comprising a control unit that operates in the opening direction. 6. The control device according to claim 1, wherein the control unit drives a fan provided in association with a combustion unit including the burner after operating the bypass valve in an opening direction. The combustion device according to any one of the above. 7. The combustion apparatus according to claim 1, wherein the control unit causes the operation of the appliance to be continued after operating the bypass valve in the opening direction. 8. The control means, when the abnormality detection means detects an abnormality in the appliance based on the detection result, displays a necessary error and continues the opening direction operation of the bypass valve. The combustion device according to any one of claims 1 to 7, characterized in that: 9. The control means, based on the abnormality detection by the abnormality detection means, operates the bypass valve in the opening direction and then stops the operation of the appliance based on the history of occurrence of the abnormality. The combustion apparatus according to any one of claims 1 to 8, wherein the operation of opening the bypass valve in the opening direction is continued at the start of the next appliance operation.