JP2009109112A - Control device for hot water supplying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for a hot water supplying apparatus reducing odor and noise and suppressing generation of soot. <P>SOLUTION: A combustion chamber 3 receiving a combustion gas generated by a burner 2 in a can 1, and a heat exchanger 5 using a combustion passage 4 wall as a heat exchange part are provided. A hot water temperature sensor 6 attached to the can 1 outputs a combustion start signal to the burner 2 at detection of a combustion start temperature. A control means 7 is provided for outputting a combustion stop signal at detection of a combustion stop temperature. A timer means 8 is provided for starting counting by the combustion start signal of the control means 7 and stopping the combustion stop signal, and a counter means 9 is also provided for counting up when a count time of the timer means 8 is a predetermined time or less. A reset means 10 is provided for resetting the counter means 9 when the count time of the timer means 8 is a predetermined time or more, and a temperature correcting means 11 is provided for changing the combustion start temperature of the burner 2 lower and the combustion stop temperature higher when a count number of the counter means 9 reaches a predetermined number. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a control device for a water heater equipped with a hot water circulation circuit.

  Inside the can of the water heater is equipped with a burner as a heat source and a heat exchanger to which the combustion gas generated in the burner is sent. The heat exchanger is connected to the wall of the combustion chamber to which the burner is attached, and the combustion chamber The combustion gas passage is used as a heat exchange section. The combustion flame and combustion gas generated when the burner burns are sent to the combustion chamber, and the high-temperature combustion gas is discharged through the combustion gas flow path. At this time, the water stored in the heat exchanger is heated.

When the radiator is connected to the can through the circulation pipe and the circulation pump attached to the circulation pipe is operated, the hot water stored in the heat exchanger of the can is sent to the radiator through the circulation pipe, and the radiator The hot water whose temperature is reduced by releasing the heat returns to the can body, and is heated again in the can body to form hot water and sent to the radiator. At this time, the hot water temperature in the can is monitored by the hot water temperature sensor. When the hot water temperature in the can decreases and the hot water temperature sensor detects the combustion start temperature, combustion of the burner starts and the hot water temperature in the can increases. When the hot water temperature sensor detects the combustion stop temperature, combustion of the burner is stopped and the hot water in the can is maintained at the set temperature.
Japanese Patent Laid-Open No. 61-213422

  What constitutes a circulation circuit by connecting a radiator can be connected to a plurality of radiators by branching the circulation pipe connected to the water heater in the middle, and only one of the plurality of radiators can be connected. It can be operated, multiple units can be operated simultaneously, or the output can be changed on the radiator side.

  Although the amount of heat radiation on the radiator side changes depending on the number of radiators and the output that are operated in this way, the hot water heater is based on the set temperature and the hot water temperature in the can body regardless of the heat radiation amount on the radiator side. Because it controls the combustion of the heat sink, when only one radiator is operated or when the output of the radiator is lowered, the amount of heat radiation is reduced and the hot water temperature returning to the can body is less likely to decrease. The hot water temperature of the can immediately rises to the combustion stop temperature, and the time from the start of the burner to the stop becomes very short, and the burner is ignited and extinguished in a short time. Is repeated, noise and odor are increased, and soot is easily generated in the combustion chamber and heat exchanger.

  On the other hand, when multiple radiators are connected and operated simultaneously, or when the temperature is low, the amount of heat dissipated on the radiator side may increase, and a load exceeding the capacity of the water heater may be applied. The burner may continue to burn for a long time without raising the temperature of the hot water, and if the burner continues to burn for a long time, the burner's combustion flame will continue to hit the same location in the combustion chamber, and the combustion flame in the combustion chamber will hit However, the burning state of the burner deteriorates due to adhesion of soot, and the burner needs to be maintained in a short period of time.

  The present invention solves the above-mentioned problem, and burner 2 serving as a heat source in can 1, combustion chamber 3 to which combustion gas generated in burner 2 is sent, combustion chamber 3 wall or combustion following combustion chamber 3 A heat exchanger 5 having a wall of the gas flow path 4 as a heat exchanging portion is provided, a hot water temperature sensor 6 attached to the side wall of the can body 1, and the burner 2 based on detection data of the hot water temperature sensor 6. And a control means 7 for controlling the operation. The control means 7 outputs a combustion start signal to the burner 2 when the hot water temperature sensor 6 detects the combustion start temperature, and the burner 2 when the hot water temperature sensor 6 detects the combustion stop temperature. A timer unit 8 that outputs a combustion stop signal to maintain the hot water temperature in the can 1 at a set temperature, and starts counting with the combustion start signal of the control unit 7 and stops with the combustion stop signal; The count time of the timer means 8 is less than a predetermined time A counter means 9 for counting and adding, a reset means 10 for resetting the counter means 9 when the count time of the timer means 8 exceeds a predetermined time, and a burner when the count number of the counter means 9 reaches a predetermined number 2 is provided with temperature correction means 11 for changing the combustion start temperature 2 lower and the combustion stop temperature higher.

  Further, when the timer means 8 counts the set time before the control means 7 outputs the combustion stop signal, it outputs a combustion stop signal to the burner 2 and outputs a combustion start signal for a certain time from the output of the combustion stop signal. By providing the canceling means 12 that does not output, it is possible to prevent the burning flame of the burner from continuing around the same part in the combustion chamber for a long time and to prevent soot accumulation in the combustion chamber.

  Further, when a radiator 14 is attached to the side wall of the can 1 via a circulation pipe 13 and a circulation pump 15 is attached to the circulation pipe 13 to constitute a hot water circulation circuit, By performing combustion control of the burner according to the output, the burden on the burner can be reduced.

  Further, a radiator 14 is attached to the side wall of the can body 1 via a circulation pipe 13, and a circulation pump 15 is attached to the circulation pipe 13 to constitute a hot water circulation circuit. The control means 7 stops combustion. When the timer means 8 counts the set time before outputting the signal, the circulation pump 15 is stopped, and after the circulation pump 15 is stopped, the hot water temperature sensor 6 detects the combustion stop temperature and outputs a combustion stop signal. When the operation of the circulation pump 15 is restarted, the combustion of the burner 2 stops after the hot water temperature in the can body 1 rises. Therefore, after the operation of the circulation pump 15 is restarted, Can send.

  In the present invention, the burning time of the burner 2 is counted by the timer means 8, and when the counting time of the timer means 8 is less than a predetermined time, the counter means 9 counts up, and the burner 2 burns continuously for a short time. When the counter means 9 reaches the predetermined number of times, the combustion start temperature of the burner 2 is lowered and the combustion stop temperature is changed higher by the temperature correction means 11, and from the start of combustion of the burner 2 to the stop of combustion. By widening the temperature range, the burner 2 combustion time can be made longer than usual and the burner 2 combustion / stop frequency can be reduced, so noise and odor during ignition and extinguishing can be reduced. It became possible to suppress.

  The timer means 8 starts counting with the combustion start signal of the control means 7 and stops counting with the combustion stop signal, but when the timer means 8 counts the set time before the control means 7 outputs the combustion stop signal. Does not output a combustion start signal even if the hot water temperature sensor 6 detects the combustion start temperature for a certain period of time during which the canceling means 12 operates and the canceling means 12 operates to output a combustion stop signal to the burner 2. It has a configuration. For this reason, when the burner 2 continues to burn until the set time, the combustion of the burner 2 is temporarily stopped, so that the combustion flame of the burner 2 does not continue to hit the same location in the combustion chamber 3 for a long time. Thus, a large amount of soot no longer adheres to only a part of the combustion chamber 3, and the burner 2 can maintain a stable combustion state even when used for a long time.

  Moreover, since it respond | corresponds with the combustion control by the side of the water heater by the control means 7 with respect to the change of the heat dissipation amount of the heat radiator 14, it can respond easily even if the kind of heat radiator connected to the can 1 changes. Is.

  In addition, when the radiator 14 is connected to the can 1 to form a circulation circuit, when the burner 2 continues to burn beyond the set time, the capacity of the water heater with respect to the output on the radiator 14 side. Therefore, when the count time of the timer means 8 reaches the set time, the hot water temperature in the can body 1 is raised by stopping the operation of the circulation pump 15, and the hot water temperature sensor 6 A combustion stop signal is output to the burner when the combustion stop temperature is detected, and the operation of the circulation pump 15 is restarted. When the circulation pump 15 restarts operation, the temperature inside the can 1 increases to the combustion stop temperature. When water is sent to the radiator 14 and the low-temperature water after heat dissipation returns from the radiator 14, the burner 2 starts to burn, so the burner 2 temporarily stops combustion and the soot in the combustion chamber 3 adheres. To prevent and send to radiator 14 That the temperature is raised the hot water was the thing that can solve the shortage of capacity of the water heater.

  The present invention will be described with reference to the embodiments shown in the drawings. Reference numeral 2 denotes a burner serving as a heat source for a hot water heater, 5 denotes a heat exchanger for heating water with the combustion heat of the burner 2, and 1 denotes a tube constituting the heat exchanger 5. 3 is a combustion chamber in which the combustion gas of the burner 2 disposed inside the lower portion of the can body 1 is sent, 16 is an exhaust gas chamber disposed in the upper portion of the can body 1, and 4 is a combustion chamber 3 and an exhaust gas chamber. A combustion gas flow path attached between 16 and an exhaust pipe 17 connected to the exhaust gas chamber 16. When the burner 2 is operated, the combustion flame and the combustion gas are sent to the combustion chamber 3. 4 is sent to the exhaust gas chamber 16 and discharged from the exhaust cylinder 17.

  Reference numeral 18 denotes a water chamber constituting the heat exchanger 5 having the wall of the combustion chamber 3 and the wall of the combustion gas flow path 4 as a heat exchanging portion, 6 denotes a hot water temperature sensor provided on the side wall of the can 1, and 7 denotes combustion of the burner 2 Control means 19 for issuing a start or stop command, 19 is a temperature setting means for setting the hot water temperature, and the combustion start temperature and the combustion stop temperature of the burner 2 are set by the set temperature of the temperature setting means 19, and the hot water temperature sensor When the combustion start temperature is detected by 6, a combustion stop signal is output to the burner 2. When the hot water temperature sensor 6 detects the combustion stop temperature, the combustion stop signal is output to the burner 2, so that the water in the water chamber 18 is temperature setting means. Boil to reach the hot water temperature set at 19.

  13a is a forward pipe connected to the upper side wall of the can body 1, 13b is a return pipe connected to the lower side wall of the can body 1, 13 is a circulation pipe composed of the forward pipe 13a and the return pipe 13b, and 14 is a forward pipe 13a. It is a radiator connected to the heat exchanger 5 through the return pipe 13b. Reference numeral 15 denotes a circulation pump attached in the middle of the forward pipe 13a. When the circulation pump 15 is driven, the hot water in the water chamber 18 is sent from the forward pipe 12a to the radiator 14, and the radiator 14 releases heat to lower the temperature. The heated water is returned to the water chamber 18 from the return pipe 13b, and becomes warm water again to be sent to the radiator 14 to circulate, thereby constituting a hot water circulation circuit.

  In the water heater provided with the circulation circuit as described above, the radiator 14 connected to the circulation pipe 13 includes a heating device such as a fan convector constituting a hot water heating device, a hot water panel constituting a floor heating device and a snow melting device. The circulation pipe 13 connected to the can 1 is branched in the middle, and a plurality of radiators 14 can be connected to one water heater.

  FIG. 2 shows a configuration in which the radiator 14 is constituted by a heating device, 20 is a heating device frame installed indoors, 21 is a heating heat exchanger arranged in the heating device frame 20, and 22 is a heating device frame. The hot water can body 1 and the heating heat exchanger 21 are connected by a forward pipe 13a and a return pipe 13b. When the circulation pump 15 is operated, the hot water in the can body 1 is When the air flow of the convection fan 22 passes through the heating heat exchanger 21 and is sent to the heating heat exchanger 21 through the forward pipe 13a, it is heated by the amount of hot water released from the heating heat exchanger 21. It has been blown into the room as warm air.

  The hot water heater may be operated at the same time or a plurality of heaters may be operated at the same time, and may be operated by switching the heating output of each individual heater. When operating only one of the multiple heating devices, or when operating with the output of the heating device lowered, the amount of heat dissipated on the heating device side is reduced, but the water heater is independent of the operating state of the heating device. Since the operation is based on the set temperature of the temperature setting means 19, the amount of hot water sent from the water heater increases with respect to the amount of heat required on the heating device side, and the hot water temperature of the hot water is not lowered. Come back to. For this reason, the hot water temperature of the can 1 rises to the combustion stop temperature in a short time, and the burner 2 immediately stops combustion.

  When combustion of the burner 2 is stopped, the hot water temperature in the can 1 is lowered, the hot water temperature sensor 6 detects the combustion start temperature, and a combustion start signal is output to the burner 2. When the heat dissipation on the machine side is small, the burner 2 will stop burning again in a short time, and the combustion and stop of the burner 2 will be repeated in a short time, resulting in noise during ignition and extinguishing There is a problem that the number of occurrences of odor and odor increases.

  When the burner 2 repeats combustion and stop for a short time as described above, it is possible to cope with this by changing the set temperature on the hot water supply side to be low. Each time the output is changed, the set temperature of the water heater must also be changed, and it is difficult to select an appropriate set temperature, which may cause a decrease in the heating output of the heating system and uneven temperature of the hot air Therefore, it is not preferable to change the set temperature of the water heater.

  The present invention solves the above-mentioned problem. Reference numeral 8 denotes timer means for starting counting with a combustion start signal from the control means 7 and stopping counting with a combustion stop signal. Reference numeral 9 denotes when the count time of the timer means 8 is less than a predetermined time. Counter means 10 for counting and adding is a reset means 10 for resetting the counter means 9 when the count time of the timer means 8 is a predetermined time or more.

  S1 is a first determination unit that receives the count time of the timer means 8, and the control means 7 starts counting of the timer means 8 when the hot water temperature sensor 6 detects the combustion start temperature and outputs a combustion start signal. When the hot water temperature sensor 6 detects the combustion stop temperature and outputs a combustion stop signal, the timer means 8 stops counting, and the first determination unit S1 checks the count time of the timer means 8. In the embodiment, a predetermined time as a reference of the count time of the timer means 8 is set to 3 minutes. When the count time of the timer means 8 is within 3 minutes, the count of the counter means 9 is added and the count of the timer means 8 is counted. When the time is 3 minutes or more, the value of the counter means 9 is reset.

  S2 is a second determination unit that receives the count number of the counter means 9, and when the timer means 8 detects a predetermined time or less in the first determination section S1, the second determination section S2 counts the count number of the counter means 9 Check if is the upper limit. In the embodiment, the upper limit value of the count number of the counter means 9 is set to 3, and when the count number is less than the upper limit value of 3, the normal operation control is continued, and the count number of the counter means 9 is the upper limit value. Until it becomes, the combustion of the burner 2 is controlled based on the set temperature of the temperature setting means 19. Further, when the count time of the timer means 9 detects a predetermined time or more before the count number of the counter means 9 reaches the upper limit value, the value of the counter means 9 is reset.

  Reference numeral 11 denotes a temperature correction means that operates when the count number of the counter means 9 reaches a predetermined number. Combustion of the burner 2 stops three consecutive times within 3 minutes, and the second determination unit S2 uses the counter means. When it is confirmed that the count number 9 has reached the upper limit of 3, the combustion start temperature set in the control means 7 by the temperature correction means 11 is lowered and the combustion stop temperature is changed higher, and the control means 7 is changed. Combustion of the burner 2 is controlled based on the subsequent combustion start temperature and combustion stop temperature.

  By changing the combustion start temperature and the combustion stop temperature of the burner 2 in this way, the burner 2 starts combustion after reaching a hot water temperature lower than normal, and continues to burn until the hot water temperature becomes higher than normal. From the start of combustion to the stop of the burner 2, the temperature range from the start to the stop of the burner 2 can be increased, and even when the amount of heat released on the radiator 14 is reduced, the burner 2 can have a longer combustion time. 2 no longer repeats burning and stopping, and the number of times of ignition and extinguishing is reduced, so that generation of noise and odor can be suppressed.

  Since the heating output of the heating device is low when changing the combustion start temperature and the combustion stop temperature, changing the temperature range of the water heater does not decrease the heating output of the heating device, and also starts combustion When the burner 2 burns for a predetermined time or more after changing the temperature and the combustion stop temperature, or when the burning time of the burner 2 becomes longer than the predetermined time due to the change in the number of operating heating units or heating output, the normal set temperature is reached. Since it returns to the combustion control based on it, it can respond also to the change of the heating output by the side of a heating apparatus.

  FIG. 3 shows a structure in which the heat radiator 14 is constituted by a snow melting device, 23 is a hot water panel embedded in a road surface such as a road, 24 is a snowfall sensor for detecting snowfall, and a can of a water heater 1 and the hot water panel 23 are connected via the forward pipe 13a and the return pipe 13b, and when a snowfall detection signal is output from the snowfall sensor 24, the control device 7 drives the circulation pump 15 to drive the can 1 Of warm water is sent to the hot water panel 23, and the snow and ice on the road surface are released by releasing the amount of heat of the hot water through the hot water panel 23. When the snow sensor 24 no longer outputs a snow detection signal, it circulates with the burner 2. The operation of the pump 15 is stopped.

  In the above snow melting device, when the amount of snowfall is large or the temperature is extremely low, the temperature of the hot water returning from the hot water panel 23 to the can 1 is extremely low, and a load exceeding the capacity of the water heater is applied. Even if the burner 2 continues to burn, the hot water temperature of the can 1 does not rise, and the burner 2 may continue to burn for a long time. When the burner 2 continues to burn for a long time in this way, the combustion flame of the burner 2 continues to hit the same location in the combustion chamber 3, so that soot easily accumulates only on the portion hit by the combustion flame. Combustion deteriorates and maintenance of the burner 2 becomes necessary.

  S3 is a third determination unit that monitors the count time of the timer means 8 during combustion of the burner 2, and 12 is a cancellation means that operates for a predetermined time in response to the output of the third determination unit S3. When it is confirmed that the count time of the means 8 has reached the set time, the cancel means 12 is activated, the control means 7 outputs a combustion stop signal to stop the combustion of the burner 2, and the burner 2 exceeds the set time. During a certain period of time during which the canceling means 12 is operating, the control means 7 does not output a combustion start signal and the burner 2 stops, even if the hot water temperature sensor 6 detects the combustion start temperature. This is to maintain the state. In the embodiment, the setting time determined by the third determination unit S3 is set to 2 hours, and the operation time of the canceling means 12 is set to 10 seconds. When the burner 2 continues to burn for 2 hours, at least 10 seconds. Combustion of the burner 2 is stopped.

  Thus, by burning the burner 2 temporarily when the burner 2 continues to burn for a set time, the burning of the burner 2 can be stopped before soot accumulates in the combustion chamber 3, When the burner 2 resumes combustion, the position of the burner 2 to which the combustion flame hits changes, so that the combustion flame of the burner 2 does not continue to hit the same location in the combustion chamber 3 for a long time, and soot accumulation can be prevented. Thus, the combustion state of the burner 2 can be maintained over a long period of time, and the maintenance load can be reduced.

  Further, when the burner 2 continues to burn for a long time as described above, the capacity of the water heater is insufficient with respect to the output of the radiator 14, and if the operation is continued as it is, May reduce ability. When the snow melting device is configured as shown in FIG. 3, if the hot water sent to the hot water panel 23 is lower than the set temperature, the expected snow melting ability cannot be obtained and the snow and ice cannot be thawed. End up.

  In another embodiment of the present invention, when the third determination unit S3 detects that the count time of the timer means 8 has reached the set time, the combustion stop signal of the burner 2 is not output and the circulation pump 15 is operated. Stop. When the circulation pump 15 stops and the hot water in the can body 1 does not flow to the radiator 14, the hot water temperature in the can body 1 rises, the hot water temperature in the can body 1 rises to the combustion stop temperature, and the hot water temperature sensor 6 When this is detected, the control means 7 outputs a combustion stop signal to stop the combustion of the burner 2 and restart the operation of the circulation pump 15.

  When combustion of the burner 2 is stopped and the circulation pump 15 is operated, warm water having a set temperature is sent to the radiator 14, and the hot water whose temperature has been lowered by the radiator 14 returns to the can 1, and the hot water temperature of the can 1 is When the hot water temperature sensor 6 detects the combustion start temperature, the combustion start signal of the burner 2 is output and the combustion of the burner 2 is restarted. The burner 2 temporarily stops the combustion, so that the burner 2 However, it does not burn for a long time and can prevent soot accumulation.

  Further, when the circulation pump 15 is stopped, the hot water stays in the can body 1 and the hot water temperature in the can body 1 rises quickly. Therefore, the time during which the circulation pump 15 is stopped is short, and the warm water of the radiator 14 is Since the operation of the circulation pump 15 is restarted before the temperature of the pump is greatly reduced, and the operation of the circulation pump 15 is restarted, the hot water in the can body 1 that has risen to the set temperature is sent to the radiator 14. It became possible to prevent a decline in ability.

It is a block diagram which shows the structure of the water heater of this invention. It is explanatory drawing which comprised the heat radiator which shows the Example of this invention with the heating apparatus. It is explanatory drawing which comprised the heat radiator which shows the Example of this invention with the snow melting apparatus. It is a flowchart which shows the structure of the Example of this invention. It is a flowchart which shows the structure of the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Can body 2 Burner 3 Combustion chamber 4 Combustion gas flow path 5 Heat exchanger 6 Hot water temperature sensor 7 Control means 8 Timer means 9 Counter means 10 Reset means 11 Temperature correction means 12 Canceling means 13 Circulation pipe 14 Radiator 15 Circulation pump

Claims (4)

Burner (2) as a heat source in can (1), combustion chamber (3) to which combustion gas generated in burner (2) is sent, and combustion following combustion chamber (3) wall or combustion chamber (3) A heat exchanger (5) having a gas flow path (4) wall as a heat exchanger, and
A hot water temperature sensor (6) attached to the side wall of the can body (1) and a control means (7) for controlling the operation of the burner (2) based on detection data of the hot water temperature sensor (6) are provided. ,
The control means (7) outputs a combustion start signal to the burner (2) when the hot water temperature sensor (6) detects the combustion start temperature, and supplies the burner (2) to the burner (2) when the hot water temperature sensor (6) detects the combustion stop temperature. In a water heater that outputs a combustion stop signal and maintains the hot water temperature in the can (1) at a set temperature,
Timer means (8) that starts counting with a combustion start signal of the control means (7) and stops with a combustion stop signal, and counter means (when the count time of the timer means (8) is less than a predetermined time) 9) and reset means (10) for resetting the counter means (9) when the count time of the timer means (8) is equal to or greater than a predetermined time;
A water heater comprising temperature correction means (11) for changing the combustion start temperature of the burner 2 low and the combustion stop temperature high when the count number of the counter means (9) reaches a predetermined number. Control device. When the timer means (8) counts the set time before the control means (7) outputs a combustion stop signal, it outputs a combustion stop signal to the burner (2) and outputs a certain time from the output of the combustion stop signal. 2. The water heater control apparatus according to claim 1, further comprising canceling means (12) that does not output a combustion start signal.   A radiator (14) is attached to the side wall of the can (1) via a circulation pipe (13), and a circulation pump (15) is attached to the circulation pipe (13) to constitute a hot water circulation circuit. The water heater control device according to claim 1 or 2, wherein A radiator (14) is attached to the side wall of the can body (1) via a circulation pipe (13), and a circulation pump (15) is attached to the circulation pipe (13) to constitute a hot water circulation circuit. And
When the timer means (8) counts a set time before the control means (7) outputs a combustion stop signal, the circulation pump (15) is stopped,
The operation of the circulation pump (15) is resumed when the hot water temperature sensor (6) detects the combustion stop temperature and outputs a combustion stop signal after the circulation pump (15) is stopped. Water heater control device.

Images