JP2011112241A - Hot water heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dew condensation in a heat exchanger and an exhaust passage in a burning capacity-variable hot water heating device. <P>SOLUTION: This hot water heating device is equipped with: the heat exchanger 12 for heating the water; a burning section 9 for heating the heat exchanger 12; a hot water temperature detecting means 11 for detecting a temperature of hot water; a hot water temperature setting means 18 for setting a temperature of the hot water; and a circulation pump 14 for circulating the heated hot water, and performs a heating operation by circulating the hot water heated by the heat exchanger 12 in a hot water circulation circuit 5 formed between the hot water heating device and a radiator 3, by the circulation pump 14. This hot water heating device is also equipped with a control section 21 for controlling the burning capacity so that a temperature detected by the hot water temperature detecting means 11 reaches a set temperature set by the hot water temperature setting means 18 by making the burning capacity of the burning section 9 variable within a range of a predetermined lower limit burning capacity or more and a predetermined upper limit burning capacity or less. The lower the set temperature set by the hot water temperature setting means 18 is, the higher the lower limit burning capacity is set by the control section 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hot water heater and is intended to prevent the occurrence of condensation in a heat exchanger and an exhaust path.

  Conventionally, this type of hot water heater has a configuration as shown in FIG. Reference numeral 101 denotes a hot water heating apparatus main body, and the hot water heated by exchanging heat in the hot water heating apparatus main body 101 is passed through the forward pipe 102 through a radiator 103 such as a floor heating panel, a panel heater or a snow melting radiator to dissipate heat. After that, the hot water circulation circuit 105 is formed to return from the return pipe 104 to the hot water heating apparatus main body 101. Further, 106 is a burner capable of changing the combustion amount, 107 is a can body for storing hot water circulating through the hot water circulation circuit 105, 108 is provided in the can body 107, and is heated by the combustion flame and combustion exhaust gas of the burner 106. A heat exchanger for exchanging heat with the hot water in the can body 107, 109 is a hot water thermistor for detecting the temperature of the hot water in the can body 107, 110 is a circulation pump for circulating the hot water in the can body 107 to the hot water circulation circuit 105, 111 Is an exhaust path such as an exhaust pipe that guides the combustion exhaust gas that has passed through the heat exchanger 108 to the outside of the hot water heating apparatus main body 101.

  Reference numeral 112 denotes a remote controller for instructing the start and stop of the heating operation of the hot water heating apparatus main body 101. The remote controller 112 has an operation switch 113 and hot water for setting the temperature of hot water in the can body 107 heated by the heat exchanger 108. A temperature setting switch 114 is provided. Reference numeral 115 denotes a control unit for controlling the hot water heating apparatus main body 101 mainly using a microcomputer. The control unit 115 receives inputs from the remote control 112 and the hot water thermistor 109 and drives the circulation pump 110 and adjusts the amount of combustion in the burner 106. It is something to control.

  Next, the operation will be described. When the heating operation is instructed by the operation of the operation switch 113 of the remote control 112, the control unit 115 starts combustion of the burner 106, heats the heat exchanger 108, and heats the inside of the can body 107. While heating the hot water, the circulating pump 110 is driven to circulate the hot water in the hot water circulation circuit 105, and the hot water is supplied to the radiator 103 to heat the air-conditioned space. During the heating operation, the control unit 115 adjusts the amount of combustion in the burner 106 so that the temperature of the hot water in the can body 107 is maintained in the vicinity of the set temperature set by the hot water temperature setting switch 114 of the remote control 112. It was something to do. (For example, refer to Patent Document 1.)

JP 2001-116267 A

  By the way, in this conventional warm water heater, during the heating operation, the control unit 115 monitors the warm water temperature in the can body 107 detected by the warm water thermistor 109, and the temperature detected by the warm water thermistor 109 is the warm water temperature setting. When the temperature approaches the set temperature set by the switch 114, the combustion amount is gradually decreased, and if it is possible to maintain the hot water temperature in the can body 107 near the set temperature, the combustion is performed up to a preset lower limit combustion amount. When the set temperature set by the hot water temperature setting switch 114 is high, even if the combustion amount in the burner 106 is lowered to the lower limit combustion amount, the hot water in the can body 107 is burned. Since the temperature difference between the temperature and the combustion exhaust gas is small and the heat exchange efficiency is low, the temperature of the combustion exhaust gas that passes through the heat exchanger 108 and the exhaust passage 111 becomes so low that condensation occurs. However, when the set temperature is low, if the combustion amount in the burner 106 is lowered to the lower limit combustion amount, the temperature difference between the hot water temperature in the can body 107 and the combustion exhaust gas is large and the heat exchange efficiency is high. The temperature of the combustion exhaust gas passing through the exchanger 108 and the exhaust path 111 becomes low, and condensation may occur in the heat exchanger 108 and the exhaust path 111, thereby corroding the heat exchanger 108 and the exhaust path 111. In addition, there is a possibility that condensation generated in the heat exchanger 108 and the exhaust path 111 may freeze in a cold region and the like, and the heat exchanger 108 and the exhaust path 111 may be clogged, resulting in poor combustion. It was a thing.

  In order to solve the above-mentioned problems, the present invention is particularly configured as claimed in claim 1 with a heat exchanger for heating water, a combustion section for heating the heat exchanger, and hot water temperature detecting means for detecting the temperature of hot water. And a hot water temperature setting means for setting the temperature of the hot water and a circulation pump for circulating the heated hot water, forming a hot water circulation circuit between the radiator and the hot water heated by the heat exchanger Circulates the hot water circulation circuit with the circulation pump to perform the heating operation, and varies the combustion amount of the combustion section within a range not less than a preset lower limit combustion amount and not more than an upper limit combustion amount, In the hot water heater having a control unit that controls the combustion amount so that the temperature detected by the hot water temperature detection unit becomes the set temperature set by the hot water temperature setting unit, the control unit is set by the hot water temperature setting unit Settings The lower degrees, and it shall be set high the lower combustion amount.

  According to the first aspect of the present invention, the lower limit combustion amount is set to be higher as the set temperature is lower, so that in the heating operation when the set temperature of the hot water is set to be lower, combustion is performed at the lower limit combustion amount. However, since the temperature of the flue gas passing through the exhaust path of the heat exchanger and flue gas becomes high, dew condensation that occurs in the heat exchanger and the exhaust path can be suppressed. It can prevent clogging of heat exchangers and exhaust passages due to corrosion and freezing of condensation in cold regions.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water heating apparatus of one Embodiment of this invention. The principal part block diagram of the same embodiment. The figure which shows the range of the combustion amount with respect to the setting temperature of the same embodiment. The schematic block diagram of the conventional warm water heating apparatus.

Next, a hot water heater according to an embodiment of the present invention will be described with reference to FIG.
Reference numeral 1 denotes a hot water heating apparatus main body in the present embodiment, and hot water heated by exchanging heat in the hot water heating apparatus main body 1 is supplied from a forward pipe 2 to a radiator 3 such as a floor heating panel, a panel heater, or a heat sink for melting snow. A hot water circulation circuit 5 is formed from the return pipe 4 to the hot water heater main body 1 after passing through and dissipating heat.

  The hot water heater main body 1 includes a blower 6 that blows combustion air, a constant oil level device 7 that always stores a certain amount of kerosene, a fuel pump 8 that supplies kerosene of the constant oil level device 7, and a blower 6 is a combustion section that burns with combustion air blown by the fuel 6 and kerosene supplied by the fuel pump 8, a can body 10 that stores hot water that circulates through the hot water circulation circuit 5, and the forward pipe 2 side. The hot water thermistor 11 serving as a hot water temperature detecting means for detecting the temperature of the hot water in the can body 10 and the can body 10 are heated by the combustion flame of the burner 9 and the combustion exhaust gas generated by the combustion of the burner 9. A heat exchanger 12 that exchanges heat with the hot water in the can 10, an exhaust path 13 such as an exhaust pipe that guides the combustion exhaust gas that has passed through the heat exchanger 12 to the outside of the hot water heating apparatus body 1, Hot water is circulated in the hot water circulation circuit 5 A circulation pump 14 which is provided between the circulation pump 14 and the boiler body 10, in which the steam-water separator 15 that separates the hot air in the hot water has been built.

  Reference numeral 16 denotes a remote controller for remotely operating the hot water heating apparatus body 1. The remote controller 16 heats the heat exchanger 12 by burning the burner 9 to heat the hot water in the can body 10 and radiates the hot water in the can body 10. An operation switch 17 for instructing the start or stop of the heating operation for circulating the air-conditioned space such as the room by circulating it in the vessel 3, and the hot water for setting the temperature of the hot water in the can 10 heated by the heat exchanger 12 A hot water temperature setting switch 18 as temperature setting means and a display unit 19 for displaying the temperature set by the hot water temperature setting switch 18 are provided. In this embodiment, the set temperature of the hot water can be set between 20 ° C. and 80 ° C. with the hot water temperature setting switch 18. Reference numeral 20 denotes an operation unit provided in the hot water heating apparatus main body 1 and includes an operation switch, a hot water temperature setting switch, and a display unit, like the remote controller 16.

  Reference numeral 21 denotes a control unit for controlling the hot water heating apparatus main body 1 mainly using a microcomputer. As shown in FIG. 2, the control unit 21 receives signals from various switches of the remote control 16 or the operation unit 20 and signals from the hot water thermistor 11, and 6, the fuel pump 8 and the circulation pump 14 are controlled.

  The control unit 21 can control the capacity of the blower 6 and the fuel pump 8 to vary the combustion amount within a range not less than a preset lower limit combustion amount and not more than an upper limit combustion amount. Is for controlling the amount of combustion so that the hot water temperature in the can 10 detected by the hot water thermistor 11 becomes a temperature near the set temperature set by the hot water temperature setting switch 18 of the remote controller 16. The hot water temperature in the can body 10 is set to the upper limit combustion amount so that the hot water temperature in the can body 10 quickly rises to the set temperature set by the hot water temperature setting switch 18, and then the hot water temperature in the can body 10 is set. If the temperature approaches the temperature, the combustion amount of the burner 9 is gradually decreased, and if it is possible to maintain the hot water temperature in the can 10 at the set temperature, the combustion amount is decreased to a preset lower limit combustion amount and combustion is performed. If the hot water temperature in the can 10 reaches a temperature higher than the set temperature by a predetermined temperature, combustion of the burner 9 is stopped, and if the hot water temperature in the can 10 reaches a temperature lower than the set temperature by the burner 9 Combustion is started, and the amount of combustion is appropriately controlled so that the temperature of the hot water in the can 10 approaches the set temperature.

  Further, as shown in FIG. 3, the control unit 21 stores a combustion amount range corresponding to the set temperature set by the hot water temperature setting switch 18, and is indicated by a one-dot chain line in FIG. The straight line represents the upper limit combustion amount, and the straight line indicated by a two-dot chain line represents the lower limit combustion amount. For example, when the set temperature is set to 20 ° C., the upper limit combustion amount is 23 kW and the lower limit combustion amount is 15 kW, and the control unit 21 is in the range of 15 kW to 23 kW in the burner 9 during the heating operation. When the combustion amount is varied and the set temperature is set to 40 ° C., the upper limit combustion amount is 23 kW and the lower limit combustion amount is 11 kW, and the control unit 21 is within the range of 11 kW to 23 kW during the heating operation. When the combustion amount in the burner 9 is varied and the set temperature is set to 80 ° C., the upper limit combustion amount is 23 kW and the lower limit combustion amount is 7 kW, and the control unit 21 performs 7 kW to 23 kW during the heating operation. Within this range, the amount of combustion in the burner 9 is varied.

  From the above description of FIG. 3, it can be seen that the lower the set temperature set by the hot water temperature setting switch 18, the higher the lower limit combustion amount is set compared to the case where the set temperature is high. In the heating operation when the set temperature is set low, the combustion exhaust gas that passes through the heat exchanger 12 and the exhaust path 13 as much as the lower limit combustion amount is set even when the lower limit combustion amount is burned. Therefore, the condensation that occurs in the heat exchanger 12 and the exhaust path 13 can be suppressed, the heat exchanger 12 and the exhaust path 13 are corroded due to condensation, and the heat exchanger is caused by freezing of the condensation in cold regions. 12 and the exhaust passage 13 can be prevented from being clogged. The lower limit combustion amount for each set temperature is such that when the burner 9 is burned at the lower limit combustion amount, the temperature of the combustion exhaust gas discharged from the heat exchanger 12 is slightly higher than the temperature at which condensation occurs. The amount of combustion is a certain amount, and is determined in advance by experiments.

Next, the operation at the time of heating operation will be described.
When the operation switch 17 of the remote controller 16 is operated and an instruction to start the heating operation is given, the control unit 21 drives the blower 6 and the fuel pump 8 to start combustion in the burner 9, heats the heat exchanger 12 and cans While heating the warm water in the body 10, the circulation pump 14 is driven to circulate the warm water in the warm water circulation circuit 5, and the warm water is supplied to the radiator 3 to heat the air-conditioned space. When the heating operation is started, a signal of a set temperature set by the hot water temperature setting switch 18 is sent from the remote controller 16 to the control unit 21, and the control unit 21 preliminarily sets the set temperature and the temperature as shown in FIG. The upper limit combustion amount and the lower limit combustion amount are set from the range of the combustion amount corresponding to the stored set temperature.

  Further, during the heating operation, the control unit 21 sets the combustion amount so that the hot water temperature in the can body 10 detected by the hot water thermistor 11 becomes a temperature around the set temperature set by the hot water temperature setting switch 18 of the remote controller 16. Here, when the set temperature is 40 ° C., the warm water temperature in the can 10 quickly rises to the set temperature 40 ° C. set by the warm water temperature setting switch 18 at the start of the heating operation. As described above, the combustion amount of the burner 9 is set to 23 kW which is the upper limit combustion amount, and then the combustion amount of the burner 9 is gradually lowered when the hot water temperature in the can body 10 approaches the set temperature. If it is possible to maintain the hot water temperature at the set temperature, the combustion amount is lowered to a preset lower limit combustion amount of 11 kW, combustion is performed at the lower limit combustion amount, and the hot water temperature in the can 10 is predetermined from the set temperature. High temperature When the temperature is reached, combustion of the burner 9 is stopped, and when the hot water temperature in the can body 10 reaches a temperature lower than the set temperature by a predetermined temperature, combustion of the burner 9 is started and the hot water temperature in the can body 10 is set to the set temperature. The amount of combustion is appropriately controlled so as to approach

  The present invention is not limited to the above-described embodiment. In this embodiment, hot water is stored in the can 10 and the hot water in the can 10 is exchanged by the heat exchanger 12. Although it was a hot water storage type in which the hot water thermistor 11 detects the heated hot water temperature in the heated can body 10, the heat exchanger 12 may be a fin tube type heat exchanger or a fin tube type heat exchanger. In the case of an exchanger, it is only necessary to provide the hot water thermistor 11 at a position where the temperature of the hot water flowing out from the heat exchanger can be detected, and various modifications are possible without departing from the scope of the present invention. This is not disturbed.

  Further, in this embodiment, the burner 9 with variable amount of combustion for burning using kerosene as fuel is used, but the present invention is not limited to this, and the burner 9 may be a gas burner with variable amount of combustion using gas fuel. It is.

3 Heat Dissipator 5 Hot Water Circulation Circuit 9 Burner 11 Hot Water Thermistor 12 Heat Exchanger 14 Circulation Pump 18 Hot Water Temperature Setting Switch 21 Control Unit

Claims (1)

  A heat exchanger for heating water, a combustion section for heating the heat exchanger, a hot water temperature detecting means for detecting the temperature of hot water, a hot water temperature setting means for setting the temperature of hot water, and circulating the heated hot water A circulation pump that forms a hot water circulation circuit between the radiator and the radiator, and performs the heating operation by circulating the warm water heated by the heat exchanger through the hot water circulation circuit by the circulation pump. The combustion amount of the combustion section is varied within a range not less than a preset lower limit combustion amount and not more than an upper limit combustion amount, and the temperature detected by the hot water temperature detection means is a set temperature set by the hot water temperature setting means In the hot water heating apparatus provided with a control unit for controlling the combustion amount so as to become, the control unit sets the lower limit combustion amount higher as the set temperature set by the hot water temperature setting means is lower With features That hot-water heating system.

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