JP5034303B2 - Hot water temperature control device for water heater - Google Patents

Description

  The present invention relates to a control device with a hot and cold water mixing function that reduces discomfort when an abnormality occurs in a water heater.

  A combustion chamber with a burner as a heat source for the water heater is placed inside the can body, and multiple smoke pipes that connect the exhaust chamber adjacent to the upper part of the can body and the combustion chamber are installed. The side wall is used as a heat exchange part. 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 smoke pipe, and at this time, the water stored in the can is heated.

  A water supply pipe that supplies cold water and a hot water discharge pipe that discharges hot water are attached to the can body. A hot water temperature sensor is attached to the water supply pipe and the hot water pipe, and when the cold water enters the can body from the water supply pipe, The water is heated to become hot water and used at a predetermined place by a hot water pipe. At this time, the hot water temperature sensor monitors the hot water temperature, and the burner keeps the hot water in the heat exchanger at a predetermined temperature by repeating the operation and stoppage according to the output of the hot water temperature sensor.

In addition, a bypass path is provided between the water supply pipe and the tapping pipe, a water flow valve is installed upstream of the connection section of the tapping pipe with the bypass path, a bypass valve is installed in the middle of the bypass path, and the tapping pipe is connected. Hot water that has a hot water temperature sensor installed at the downstream side of the head and that controls the opening of the water flow valve and the bypass valve so that the hot water temperature becomes the set temperature, determines the mixing ratio of hot water and maintains the set temperature When the set temperature is changed, the hot water supply temperature can be changed simply by operating the water flow valve and the bypass valve to change the mixing ratio of the hot water (see Patent Document 1).
JP-A-6-202741

  Generally, a safety device that stops burning of the burner is activated when a malfunction occurs in the hot water heater during operation, but when an abnormality has occurred in a part that directly affects the temperature of the hot water, hot water is discharged from the hot water pipe. The user may be burned. For this reason, in a water heater equipped with a hot and cold water mixing function, the hot water pipe discharge valve that discharges high-temperature water simultaneously with the stop of the burner is driven in the fully closed direction, and the bypass valve of the bypass passage through which cold water passes is fully opened. Driven to lower the temperature of hot water discharged from the hot water pipe, ensuring safety in the event of an abnormality. However, this method performs the same tapping temperature control even when there is an abnormality in the parts related to the tapping temperature and when parts that are not related to the tapping temperature occur, and even if there is no need to lower the tapping temperature. Since the water is changed to cold water, there is a drawback that the user is uncomfortable.

The present invention solves the above-described problem. An exhaust chamber 2 is provided adjacent to the upper portion of a cylindrical can body 1, and a combustion chamber 4 in which the combustion gas of the burner 3 is sent inside the lower portion of the can body 1. A plurality of smoke pipes 5 are attached between the exhaust chamber 2 and the combustion chamber 4, a water chamber 6 is formed by the gap between the can body 1 and the combustion chamber 4, and the inlet side of the can body 1 A water supply pipe 7 for supplying cold water by connecting to the outlet, a hot water pipe 8 for discharging heated hot water connected to the outlet side of the can 1, and a can body by branching from the water supply pipe 7 and connecting to the hot water pipe 8 And a bypass passage 9 that constitutes a water flow that does not pass through 1, and a hot water temperature sensor 10 that detects the temperature of the hot water in the can body 1 is attached to the side wall of the can body 1. Is equipped with a tapping temperature sensor 11 and a water flow valve 1 attached to a tapping pipe 8 upstream of the bypass 9. And a bypass valve 13 attached to the bypass passage 9, and a hot water temperature control means 15 that varies the opening degree of the water passage valve 12 and the bypass valve 13 from the signal of the hot water temperature setting means 14 and the signal of the hot water temperature sensor 11. In the provided water heater, an abnormality detection means 16 for detecting an abnormality in the water heater and stopping the burner 3, and an abnormality in the temperature control section and an abnormality other than the temperature control section based on the output signal of the abnormality detection means 16 the determination means 17 is provided, the abnormality detecting means 16 drives the Tsusuiben 12 by operating the hot water temperature control unit 15 the determination means 17 when detecting an abnormality of the temperature control unit in the fully closed direction and by driving the bypass valve 13 is fully opened direction, the determining means 17 upon detecting an abnormality other than the temperature control unit of the hot water temperature control unit 15 the Tsusuiben 12 without actuating the said bypass valve 13 the opening Lifting, and is characterized in that gradually lowers the hot water temperature after stopping the burner 3.

  Further, a bimetal switch 18 that is operated when the can body 1 is abnormally hot and stops the burner 3 is attached to the side wall of the can body 1 that is higher than the hot water temperature sensor 10, and the determination means 17 has a temperature when the bimetal switch 18 is operated. It is determined that the controller is abnormal, and the hot water temperature of the water chamber 6 may be high when the bimetal switch 18 is operated, but high temperature water is not discharged from the hot water pipe 8. .

  A water supply temperature sensor 19 is attached to the water supply pipe 7, a hot water supply temperature sensor 20 is attached to the hot water supply pipe 8 upstream of the bypass passage 9, and the abnormality detection means 16 is connected to the hot water temperature sensor 10 and the hot water temperature. When any abnormality of the sensor 11, the feed water temperature sensor 19 and the hot water temperature sensor 20 is detected, it is determined that the temperature control unit is abnormal. Hot water is not discharged.

  Further, the temperature data detecting means 21 for detecting the order data of the detected temperatures of the hot water temperature sensor 10, the tapping temperature sensor 11, the feed water temperature sensor 19, and the hot water temperature sensor 20, and the order data of the detected temperature of each temperature sensor. And a comparison means 23 for comparing the order data of the temperature data detection means 21 and the comparison data storage means 22. The comparison means 23 is provided with the temperature data detection means 21 and the comparison data storage means 22. When the order data of the temperature sensor is different, the abnormality of the temperature control unit is output, and even if there is an error in the detection temperature of each temperature sensor or incorrect installation of the temperature sensor, hot water will not be discharged. is there.

  In addition, an alarm unit 24 that is operated by the abnormality detection unit 16 is provided, and the alarm unit 24 outputs a different alarm depending on the signal of the determination unit 17, so that the user is informed in advance whether hot water is suddenly changed to cold water. It is possible to reduce the discomfort caused by suddenly changing hot water to cold water.

  The water heater of the present invention is provided with a determination unit 17 that determines whether the abnormality detected by the abnormality detection unit 16 is an abnormality of the temperature control unit or an abnormality other than the temperature control unit. When an abnormality is detected, the hot water temperature control means 15 drives the water flow valve 12 in the fully closed direction and drives the bypass valve 13 in the fully open direction, and lowers the hot water temperature discharged from the hot water pipe 8. Therefore, high temperature water is not discharged from the hot water outlet pipe 8, and the safety at the time of abnormality of a temperature control part is securable. On the other hand, when the determination means 17 detects an abnormality other than the temperature control unit, the opening degree of the water flow valve 12 and the bypass valve 13 is not changed, and the hot water mixing ratio is maintained, so that an abnormality occurs during the use of hot water. However, the hot water temperature is not suddenly lowered, and the user's discomfort can be reduced.

  Further, the side wall of the can body 1 is provided with a bimetal switch 18 that operates when the can body 1 is at an abnormally high temperature, and the determination means 17 determines that the temperature control unit is abnormal when an operation signal from the bimetal switch 18 is detected. Even when the can body 1 stops at an abnormally high temperature due to a defect in the hot water temperature sensor 10, high temperature water is not discharged from the hot water discharge pipe 8.

  Further, a water supply temperature sensor 19 is attached to the water supply pipe 7, a hot water supply temperature sensor 8 and a hot water temperature sensor 11 are attached to the tapping pipe 8, and a hot water temperature sensor 10 is attached to the can body 1. Is that when the abnormality detecting means 16 detects any abnormality of the water supply temperature sensor 19, the hot water supply temperature sensor 20, the hot water temperature sensor 11 and the hot water temperature sensor 10, it is determined that the temperature control unit is abnormal. If the accurate hot water temperature cannot be detected, the hot water discharged from the hot water pipe 8 may not be maintained at the set temperature, but even in this case, the hot water is not discharged from the hot water pipe 8.

  Moreover, if each temperature sensor is in a normal state, the order of the detected temperature of the water supply temperature sensor 19, the hot water temperature sensor 20, the hot water temperature sensor 11, and the hot water temperature sensor 10 is fixed and does not change. If the temperature sensor is defective or the temperature sensor is incorrectly attached, the actual temperature differs from the detected temperature, so that an accurate hot water temperature cannot be detected, and hot water may be discharged from the hot water supply pipe 8. In the present invention, when the order data of each temperature sensor detected by the temperature data detection means 21 is different from the order data preset in the comparison data storage means 22, the abnormality detection means 16 detects the abnormality and the determination means 17 Since it is determined that the temperature control unit is abnormal, the hot water is not discharged from the hot water pipe 8.

  Further, since the warning means 24 that operates by the abnormality detection means 16 that detects the abnormality of the hot water heater issues a different alarm depending on the determination of the determination means 17 that determines the type of abnormality, the user is notified of the abnormality of the hot water heater and It can be communicated to the user before the temperature suddenly drops, and there is no discomfort due to the sudden drop in hot water temperature.

  The present invention will be described with reference to the embodiments shown in the drawings. 1 is a cylindrical can body, 4 is a combustion chamber provided inside the lower portion of the can body 1, 3 is a burner placed inside the combustion chamber 4, and 2 is a can. An exhaust chamber 5 disposed adjacent to the upper portion of the body 1, 5 is a smoke pipe attached between the combustion chamber 4 and the exhaust chamber 2, and 25 is an exhaust pipe connected to the exhaust chamber 2. The combustion gas is sent to the combustion chamber 4, and the combustion gas is sent to the exhaust chamber 2 through the smoke pipe 5 and is discharged from the exhaust cylinder 25.

  6 is a water chamber constituted by a gap between the can body 1 and the combustion chamber 4, 7 is a water supply pipe connected to the lower side wall of the can body 1, and 8 is a tapping pipe connected to the upper side wall of the can body 1. The pipe 8 is connected to a faucet in a bath or kitchen. When the faucet is opened, water from the water supply pipe 7 is sent to the water chamber 6.

  10 is a hot water temperature sensor provided on the side wall of the can 1 while the water supply pipe 7 and the hot water pipe 8 are connected, 26 is a burner control means for instructing the burner 3 to start and stop combustion, and 27 is a water heater. An operation unit 27a connected to the burner control means 26 for operation is an operation control switch for instructing start / stop of the operation of the water heater provided in the operation unit 27, and operates the operation control switch 27a of the operation unit 27. Then, when the hot water heater is ready for operation, the hot water temperature sensor 10 detects the water temperature in the water chamber 6, and when the hot water temperature sensor 10 detects a temperature lower than the set hot water temperature, the burner control means 26 The operation of the burner 3 is started to boil the water in the water chamber 6 to a set temperature.

  28 is a water flow sensor that is attached to the water supply pipe 7 to detect the flow of water, 19 is a water supply temperature sensor that is attached to the water supply pipe 7, 20 is a hot water supply temperature sensor that is attached to the hot water outlet pipe 8, and the water chamber is opened by opening the faucet. When hot water heated in the hot water 6 is discharged from the hot water discharge pipe 8, cold water enters the water chamber 6, the water flow sensor 28 detects the flow of water, and the hot water temperature sensor 10 detects a temperature lower than the set temperature, burner control is performed. The means 26 starts the operation of the burner 2 again, and controls the combustion amount of the burner 3 based on the detected water amount of the water flow sensor 28 and the detected temperatures of the feed water temperature sensor 19 and hot water temperature sensor 20, and the inside of the water chamber 6 is controlled. Maintaining a constant temperature.

  9 is a bypass passage in which the water supply pipe 7 and the hot water pipe 8 are branched, 13 is a bypass valve attached in the middle of the bypass passage 9, and 12 is a water flow valve attached to the hot water outlet pipe 8 upstream of the bypass passage 9. , 11 is a hot water temperature sensor attached to the hot water pipe 8 on the downstream side of the bypass passage 9, 14 is a hot water temperature setting means provided in the operation section 27, and 15 is a variable opening degree of the water flow valve 12 and the bypass valve 13. The hot water temperature sensor 11 detects the temperature of the hot water flowing through the hot water pipe 8, and detects the hot water temperature different from the hot water temperature set by the hot water temperature setting means 14. However, the opening ratio of the water flow valve 12 and the bypass valve 13 is varied to change the mixing ratio of hot water and water. That is, when the hot water temperature sensor 11 detects a temperature lower than the set hot water temperature, the hot water temperature control means 15 opens the water flow valve 12 and closes the bypass valve 13 to raise the hot water temperature. When a temperature higher than the hot water temperature is detected, the water passage valve 12 is closed, the bypass valve 13 is opened to lower the hot water temperature, and hot water having the hot water temperature set by the hot water temperature setting means 14 is discharged from the hot water pipe 8. Is.

  In this configuration, the hot water temperature in the water chamber 6 is kept constant regardless of the set temperature, and the hot water temperature at the set temperature can be obtained by adjusting the mixing ratio of the cold water in the water supply pipe 7 and the hot water in the hot water pipe 8. The hot water temperature can be changed quickly even when the temperature difference at the time of changing the set temperature is large, and it is much easier to use than the conventional hot water storage type water heater that maintains the hot water temperature in the water chamber 6 at the set temperature. It has improved.

  Reference numeral 16 denotes an abnormality detection means that operates according to an abnormality detection signal from various sensors or an abnormality signal due to disconnection. When the abnormality detection means 16 detects an abnormality in the water heater, the burner control means 26 instructs the burner 3 to stop combustion. Then stop the operation of the water heater.

  When an abnormality occurs in the temperature control unit that is directly related to the hot water temperature, such as when the safety device is activated due to an abnormally high temperature of the can body 1 or the like when the hot water heater is abnormally stopped, hot water is discharged from the hot water pipe 8. Therefore, in order to ensure safety when an abnormality occurs in the temperature control unit, it is necessary to change the mixing ratio of hot water and lower the temperature of hot water discharged from the hot water pipe 8. Since the hot water temperature suddenly decreased during the use of hot water, there was a drawback that caused discomfort to the user.

  The present invention is intended to reduce discomfort while ensuring safety in the event of an abnormality in a water heater, and 17 is a determination means for determining the type of abnormality based on a signal from the abnormality detection means 16. The means 17 outputs different signals to the tapping temperature control means 15 when the abnormality detection means 16 detects an abnormality of the temperature control unit and when an abnormality other than the temperature control unit is detected.

  When the determination means 17 detects an abnormality in the temperature control section, the tapping temperature control means 15 drives the water flow valve 12 in the fully closed direction and drives the bypass valve 13 in the fully open direction. Since the flow of hot water from the hot water pipe 8 to the hot water pipe 8 is cut off and the hot water temperature discharged from the hot water pipe 8 can be lowered, high temperature water is not discharged from the hot water pipe 8 and the temperature control unit is abnormal. Safety can be secured.

  On the other hand, when an abnormality has occurred in a part not directly related to the hot water temperature, such as a misfire of the burner 3 or a safety device such as an anti-seismic fire extinguishing device other than the temperature controller, hot water is discharged from the hot water pipe 8. Therefore, it is not necessary to change the mixing ratio of hot and cold water. For this reason, when the determination means 17 detects abnormality other than a temperature control part, the hot water temperature control means 15 maintains the opening degree of the water flow valve 12 and the bypass valve 13, and a sudden change in hot water temperature does not occur. It is a thing.

  Thus, in the event of an abnormality in the temperature control unit where hot water may be discharged from the hot water outlet pipe 8, safety is ensured by quickly decreasing the hot water temperature, while the temperature at which hot water is not likely to be discharged. Maintaining the hot water temperature as it is when there is an abnormality other than the control unit will not cause discomfort due to a sudden drop in hot water temperature, making it possible to achieve both safety in the event of a hot water heater abnormality and reduction of discomfort did it.

  Reference numeral 18 denotes a bimetal switch whose contact is switched by heat. The bimetal switch 18 is mounted at a higher position than the hot water temperature sensor 10 on the side wall of the can 1, and the hot water temperature of the water chamber 6 is reduced due to a defect in the hot water temperature sensor 10. Even when the temperature exceeds a predetermined temperature, the burner 3 continues to burn and operates when the can body 1 reaches an abnormally high temperature, and the combustion of the burner 3 is stopped before the hot water in the water chamber 6 boils. When the bimetal 18 is operated, the hot water temperature in the water chamber 6 is considerably higher than usual, and further, after the combustion of the burner 3 is stopped, there is a temperature rise due to post-boiling, so hot water is discharged from the tapping pipe 8. There is a fear.

  In this invention, when the bimetal switch 18 is operated, the determination means 17 determines that the temperature control unit is abnormal, and the tapping temperature control means 15 drives the water flow valve 12 in the fully closed direction and drives the bypass valve 13 in the fully open direction. Therefore, the hot water in the water chamber 6 is not sent to the hot water pipe 8, and the hot water temperature discharged from the hot water pipe 8 can be lowered.

  Further, when the detected temperatures of the various temperature sensors when the water heater is operating normally are compared, the detected temperature of the water supply temperature sensor 19 that detects the temperature of the water supply pipe 7 through which the water supplied to the water chamber 6 flows is one. The detection temperature of the hot water temperature sensor 11 that detects the temperature of the hot water pipe 8 downstream of the bypass passage 9 through which the hot water of the set hot water mixed with hot and cold water flows, and the temperature of the water chamber 6 that heats the water are detected. The detected temperature of the hot water temperature sensor 10 for detecting the temperature of the outlet hot water pipe 8 upstream of the bypass passage 9 through which hot water immediately after heating is discharged is the highest. . When the water heater is operating normally, the order of the detected temperatures is always the same, and this order will not be changed.However, if a temperature sensor is mistakenly installed or if a detection error occurs in some temperature sensors, The correct temperature cannot be detected, and the order of the detected temperatures is switched.

  In the embodiment of the present invention, reference numeral 21 is a temperature data detecting means for inputting the signals of the hot water temperature sensor 10, the tapping temperature sensor 11, the feed water temperature sensor 19 and the hot water temperature sensor 20, and detecting the sequence data of the detected temperatures; The comparison data storage means 23 stores the order data of the set reference detection temperatures. The comparison means 23 compares the order data of the temperature data detection means 21 and the comparison data storage means 22. When the water flow sensor 28 detects the flow of water, the temperature control unit operates abnormally when the detected temperature order detected by the temperature data detecting means 21 is different from the order data stored in the comparison data storage means 22. Output.

  Conventionally, even if a temperature sensor is mistakenly attached or an error in the detected temperature occurs, an abnormality of the temperature sensor itself cannot be detected. Therefore, a temperature different from the actual hot water temperature is detected and If the opening degree of the bypass valve 13 is changed and the hot water or cold water is discharged from the hot water discharge pipe 8, there is a fear that the operation may be continued. Since the operation of the water heater can be stopped by judging that the temperature control unit is abnormal, safety can be ensured.

  24 is a warning means for turning on a warning lamp or sounding an alarm when the water heater is abnormal. When the abnormality detection means 16 detects an abnormality, the warning means 24 is activated to inform the user of the abnormality of the device, The hot water temperature control means 15 drives the water flow valve 12 and the bypass valve 13 based on the output of the judgment means 17 to stop the operation, and the user can confirm the abnormality of the device in advance by the warning means 24. Uncomfortable feeling can be reduced even when the hot water temperature decreases.

  Reference numeral 27b denotes a display unit that displays the operation state of the water heater provided in the operation unit 27. This display unit 27b operates in conjunction with the warning means 24 when an abnormality occurs in the water heater, and is used for the user. The display unit 27b of the embodiment can display an error code corresponding to the location where the abnormality has occurred. For this reason, by checking the error code displayed on the display unit 27b after the hot water heater is stopped, it becomes easy to specify the location where an abnormality has occurred, and maintenance is facilitated.

It is a block diagram of a water heater showing an embodiment of the present invention. It is a block diagram which shows the structure of the control apparatus of the other Example of this invention. 1 is a configuration diagram of a water heater showing an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Can body 2 Exhaust chamber 3 Burner 4 Combustion chamber 5 Smoke tube 6 Water chamber 7 Water supply pipe 8 Hot water pipe 9 Bypass passage 10 Hot water temperature sensor 11 Hot water temperature sensor 12 Water flow valve 13 Bypass valve 14 Hot water temperature setting means 15 Hot water temperature control means 16 Abnormality detection means 17 Determination means 18 Bimetal switch 19 Water supply temperature sensor 20 Hot water supply temperature sensor 21 Temperature data detection means 22 Comparison data storage means 23 Comparison means 24 Warning means

Claims (5)

An exhaust chamber 2 is provided adjacent to the upper portion of the cylindrical can body 1, and a combustion chamber 4 to which the combustion gas of the burner 3 is sent is disposed inside the lower portion of the can body 1, and the exhaust chamber 2, the combustion chamber 4, A plurality of smoke pipes 5 are attached between them, and a water chamber 6 is constituted by a gap between the can body 1 and the combustion chamber 4,
Further, a water supply pipe 7 that is connected to the inlet side of the can body 1 and supplies cold water, a hot water pipe 8 that is connected to the outlet side of the can body 1 and discharges hot water, and a hot water branched from the water supply pipe 7. A bypass path 9 that is connected to the pipe 8 and forms a water flow that does not pass through the can body 1;
A hot water temperature sensor 10 for detecting the hot water temperature in the can body 1 is attached to the side wall of the can body 1,
A tapping temperature sensor 11 is attached to a tapping pipe 8 on the downstream side of the bypass 9,
A water flow valve 12 attached to the hot water outlet pipe 8 upstream of the bypass passage 9 and a bypass valve 13 attached to the bypass passage 9 are provided.
In a water heater provided with a hot water temperature control means 15 for changing the opening degree of the water flow valve 12 and the bypass valve 13 from the signal of the hot water temperature setting means 14 and the signal of the hot water temperature sensor 11,
An abnormality detecting means 16 for detecting an abnormality of the water heater and stopping the burner 3, and a determining means 17 for determining an abnormality of the temperature control section and an abnormality other than the temperature control section based on an output signal of the abnormality detection means 16; Provided,
The abnormality detecting means 16 fully opened direction the bypass valve 13 by driving the Tsusuiben 12 by operating the hot water temperature control unit 15 the determination means 17 when detecting an abnormality of the temperature control unit in the fully closed direction Drive to
Wherein upon detection determination unit 17 abnormality other than the temperature control unit maintains the opening degree of the hot water temperature control unit 15 the Tsusuiben 12 without actuating the said bypass valve 13, after stopping the burner 3 A hot water supply temperature control device for a water heater, wherein the hot water temperature is gradually lowered .   On the side wall of the can 1 higher than the hot water temperature sensor 10 is attached a bimetal switch 18 that operates when the can 1 is abnormally hot and stops the burner 3, and the determination means 17 controls the temperature when the bimetal switch 18 is activated. The hot water supply temperature control device for a hot water heater according to claim 1, wherein the hot water supply temperature control device is determined to be abnormal. A water supply temperature sensor 19 is attached to the water supply pipe 7, and a hot water supply temperature sensor 20 is attached to the tap water pipe 8 upstream of the bypass passage 9.
The determination means 17 is characterized in that when the abnormality detection means 16 detects any abnormality of the hot water temperature sensor 10, the hot water temperature sensor 11, the hot water temperature sensor 19, and the hot water temperature sensor 20, it is determined that the temperature control unit is abnormal. The hot water supply temperature control device for a hot water supply apparatus according to claim 2. The hot water temperature sensor 10, the tapping temperature sensor 11, the hot water temperature sensor 19, the temperature data detection means 21 for detecting high and low order data of the detected temperature of the hot water temperature sensor 20, and the high and low order data of the detected temperature of each temperature sensor. A preset comparison data storage means 22;
A temperature data detection means 21 and a comparison means 23 for comparing the order data in the comparison data storage means 22;
4. The hot water supply for a hot water heater according to claim 1, wherein the comparison means outputs an abnormality of the temperature control unit when the order data of the temperature data detection means and the comparison data storage means are different. Temperature control device.   The hot water temperature control of the hot water heater according to claim 1, wherein a warning unit 24 that is operated by the abnormality detection unit 16 is provided, and the warning unit 24 outputs a different alarm depending on a signal from the determination unit 17. apparatus.

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