JP6386314B2 - Vaporizing oil water heater - Google Patents

Description

  The present invention relates to prevention of freezing of a vaporization type oil hot water supply apparatus.

  Conventionally, this type of vaporized petroleum hot water supply system uses a heater for vaporizing the fuel oil provided in the burner to energize the pipes and heat exchangers that are water flow paths to prevent freezing. There was one that tried to prevent such freezing by the heat of the heater (see, for example, Patent Document 1).

Japanese Patent No. 3606937

  By the way, in this vaporization type oil hot water supply apparatus, in order to prevent freeze-up reliably regardless of the outside air temperature, the control temperature of the heater for heating is controlled so as to maintain a maximum value of around 220 ° C. When the temperature is not so low, such a high temperature is not necessary, and there is a problem that electric power is useless and not economical.

In order to solve the above-described problems, the present invention is particularly vaporized by a vaporization section that includes a heater and vaporizes fuel, a vaporization temperature sensor that detects the temperature of the vaporization section, and the vaporization section. A burner composed of a combustion section for burning fuel oil, a combustion fan for supplying combustion air to the burner, and recovering sensible heat from the combustion gas generated by the combustion of the burner and heating water flowing through the primary heat receiving pipe a primary heat exchanger for a temperature detection means for detecting a predetermined temperature of freezing prevention, control means for the temperature which the vaporization temperature sensor is detected to control the heater to a predetermined control temperature range, the An evaporative oil hot water supply device in which the primary heat exchanger is disposed above the burner, wherein a remote control operation switch for remotely operating the evaporative oil hot water device is turned off, and the evaporative oil hot water supply device If the temperature detecting means detects the predetermined temperature for preventing freezing when the operation is stopped, the control means performs the antifreezing operation by turning on the heating heater, and at the time of the antifreezing operation. The heater is controlled such that the predetermined control temperature range becomes higher as the detected temperature of the temperature detecting means becomes lower.

  According to the present invention, since the anti-freezing is performed by using the heater for vaporizing the fuel without preparing a dedicated anti-freezing heater, no special parts are required and the cost can be reduced. Since the control temperature of the heating heater during the prevention operation is varied so as to increase as the outside air temperature decreases, the power consumption is not wasted and it is possible to reliably prevent freezing while being economical. .

The schematic block diagram which shows the vaporization type petroleum hot water supply apparatus of one Embodiment of this invention. The flowchart of the freezing prevention operation.

Next, a hot water supply apparatus according to an embodiment of the present invention will be described with reference to FIG.
Reference numeral 1 denotes a latent heat recovery type vaporized petroleum water heater of the present embodiment, 2 denotes an aluminum die-cast vaporizer that vaporizes fuel such as oil, and has a vaporized gas outlet 3 at the bottom of the vaporizer 2. It is what. 4 is a vaporizer heater provided as a heater for heating the fuel oil to a temperature at which the fuel oil can be vaporized. An aluminum die-cast mixing chamber 6 for premixing with air is provided at the bottom of the mixing chamber 5 to heat the mixing chamber 5 and prevent liquefaction of the vaporized gas flowing in from the outlet 3 to promote vaporization. A vaporizing section 7 for vaporizing fuel oil is formed by the vaporizer 2 and the mixing chamber 5 described above.

  8 is a vaporizing temperature sensor for detecting the temperature of the vaporizer 2, 9 is a mixing chamber temperature sensor for detecting the temperature of the mixing chamber 5, and 10 is provided on the back side of the vaporizer 2 above the mixing chamber 5. In the combustion section that burns the premixed premixed gas, the combustion section 10 and the vaporization section 7 constitute a burner 11. Reference numeral 12 denotes a plurality of heat-absorbing fins formed integrally with the carburetor 2 and projecting from the back of the carburetor 2 onto the combustion unit 10. During combustion, the combustion heat is fed back to the carburetor 2 as vaporization heat and vaporized. The energization amount of the heater 4 is suppressed as much as possible.

  13 is a nozzle for spraying fuel oil on the vaporizer 2, 14 is an electromagnetic pump for pumping fuel oil to the nozzle 13 via an oil feed pipe 15, 16 is a combustion fan, and an inlet and a combustion section of the vaporizer 2 via an air passage 17. Combustion air that is communicated with the air chamber 19 between the cover 10 and the cover frame 18 and sucked from the suction port 20 is supplied to the carburetor 2 as primary air for premixing, and the carburetor 2 is supplied to the air chamber 19. It is supplied as secondary air that passes through the side and is combusted in the combustion section 10 from below the mixing chamber 5.

  21 is a heat exchanger accommodated in the combustion chamber 22, and this heat exchanger 21 is a fin for recovering sensible heat from the combustion gas generated by the combustion of the combustion section 10 and heating the water flowing through the primary heat receiving pipe 23. A tube-type primary heat exchanger 24 and a secondary heat exchanger 26 that recovers latent heat from the combustion gas after passing through the primary heat exchanger 24 and heats the water flowing through the secondary heat receiving pipe 25; A primary heat exchanger 24 is disposed above the combustion unit 10, and a secondary heat exchanger 26 is disposed above the primary heat exchanger 24. The primary heat exchanger 24 and the secondary heat exchanger 26 are disposed. The combustion gas that has passed through in this order is exhausted out of the hot water supply device 1 through the exhaust port 27.

  Reference numeral 28 denotes a drain receiver that recovers drain that is generated when the water vapor in the combustion gas exchanges heat with the water flowing through the secondary heat receiving pipe 25 of the secondary heat exchanger 26 to reach a temperature below the dew point. 28 is disposed above the primary heat exchanger 24 and below the secondary heat exchanger 26, and here, a corrosion-resistant housing (not shown) constituting the secondary heat exchanger 26. The bottom plate is a drain receiver 28. A drain pipe 29 guides the drain collected by the drain receiver 28 to the neutralizer 30.

  31 is a water supply pipe for circulating water supplied from a water supply source to the heat exchanger 21, 32 is for circulating hot water heated by the heat exchanger 21, and hot water is supplied to a hot water tap (not shown) provided at a predetermined location. A hot water supply pipe 33, which is a water supply bypass pipe branched from the water supply pipe 31, has a primary heat receiving pipe 23, a secondary heat receiving pipe 25, a water supply pipe 31, a hot water supply pipe 32, and a water supply bypass pipe 33. It constitutes a circuit.

  A mixing valve 34 is provided at a connection portion between the hot water supply pipe 32 and the water supply bypass pipe 33, mixes hot water from the hot water supply pipe 32 and water from the water supply bypass pipe 33, and can change the mixing ratio. A water supply temperature sensor provided as a temperature detecting means for detecting a water supply temperature provided at 31, a flow sensor for detecting a flow rate provided at a water supply pipe 31, and a hot water provided at a hot water supply pipe 32 and heated by the heat exchanger 21. A heat exchange outlet temperature sensor as a temperature detecting means for detecting the temperature of the hot water, which detects a predetermined temperature for preventing freezing when the operation is stopped, and 38 is a temperature of hot water provided in the hot water supply pipe 32 and mixed by the mixing valve 34. Is a hot water supply temperature sensor as temperature detecting means for detecting the air temperature, and 39 is an air thermistor provided near the suction port 20 of the combustion fan 16 for detecting the combustion air temperature.

  40 is a control means for controlling the driving of the actuators such as the vaporizer heater 4, the mixing chamber heater 6, and the combustion fan 16 by receiving signals from the sensors of the latent heat recovery type vaporized petroleum hot water supply apparatus 1 mainly using a microcomputer. When the temperature detection means 37 detects that the outside air temperature has dropped and the predetermined temperature for preventing freezing is detected when the hot water supply device 1 is stopped, the control means 40 determines that the hot air generated by energizing the heaters 4 and 6 is generated. The control means 40 prevents the freezing of the heating heaters 4 and 6 as the temperature of the anti-freezing detected by the temperature detecting means 37 decreases. The control temperature is raised. Specifically, when the temperature detecting means 37 detects −5 ° C., the control temperature of the heating heaters 4 and 6 is set to 130 ° C. to 140 ° C. by the vaporization temperature sensor 8. When the outside air temperature further decreases to reach −10 ° C., the temperature is controlled to 170 ° C. to 180 ° C., and returns to the original control temperature at −3 ° C., and further decreases to −20 ° C. to reach 220 ° C. to 225 ° C. Control and return to the original control temperature at -8 ° C, which eliminates wasteful power consumption and is efficient and reliable freezing prevention. When the outside air temperature reaches 3 ° C, this freezing prevention The operation is temporarily stopped.

  41 is a remote controller that is communicably connected to the control means 40 and remotely controls the latent heat recovery vaporization type petroleum hot water supply apparatus 1. The remote control 41 is an operation that instructs on / off operation of the latent heat recovery type vaporization type petroleum hot water supply apparatus 1. An operation unit 43 including a switch 42, a hot water supply temperature setting switch for setting a hot water supply temperature, and a display unit 44 for displaying the state of the latent heat recovery type vaporized petroleum hot water supply device 1 and the hot water supply set temperature. It is.

Next, the operation of the latent heat recovery type vaporized petroleum hot water supply device 1 of this embodiment will be described.
When the operation switch 42 of the remote controller 41 is turned on, the control means 40 controls the vaporizer heater 4 based on the temperature detected by the vaporization temperature sensor 8 and mixes based on the temperature detected by the mixing chamber temperature sensor 9. The chamber heater 6 is controlled to preheat the vaporizer 2 and the mixing chamber 5, the temperature at which the vaporizer 2 can vaporize the fuel oil, for example, the temperature of the vaporizer 2 is maintained at 220 ° C. to 250 ° C. It will be in the standby state in which temperature is maintained at 125 to 130 degreeC. In this standby state, when a combustion request is generated, the burner 11 can be ignited quickly, and the power consumption during standby can be reduced by maintaining the necessary minimum temperature.

  In the standby state, when the hot water tap is opened and the flow rate sensor 36 detects a flow rate equal to or higher than the minimum operating flow rate and the control means 40 determines that a combustion request has occurred, the carburetor heater 4 and the mixing chamber heater 6 are turned on. It is forcibly turned on to improve the ignitability, and the electromagnetic pump 14 and the combustion fan 16 are driven to premix the vaporized gas vaporized in the vaporizer 2 and the primary air in the mixing chamber 5. It is ejected from the combustion section 10 to start combustion.

  The combustion gas generated by the combustion of the burner 11 flows through the primary heat exchanger 24, passes through the primary heat exchanger 24, then flows through the secondary heat exchanger 26, and passes through the secondary heat exchanger 26. Thereafter, the heat is discharged from the exhaust port 27 to the outside of the latent heat recovery type vaporized petroleum water heater 1. Further, the water supplied from the water supply source is led from the water supply pipe 31 to the secondary heat receiving pipe 25 and flows in order from the secondary heat receiving pipe 25 to the primary heat receiving pipe 23 where it is heated by heat exchange with the combustion gas. Then, the hot water led from the primary heat receiving pipe 23 to the hot water supply pipe 32 and adjusted to the hot water supply set temperature by adjusting the opening of the mixing valve 34 is finally supplied from the hot water tap.

  At this time, in the secondary heat exchanger 26, the water flowing through the secondary heat receiving pipe 25 and the combustion gas are heat-exchanged, and the drain generated when the water vapor in the combustion gas falls below the dew point is drained by the drain receiver 28. It is collected and flows into the neutralizing device 30 filled with a neutralizing agent through the drain pipe 29, neutralized in the neutralizing device 30, and then discharged to the outside of the neutralizing device 30. It is drained into the sewage.

  Next, the situation of the latent heat recovery vaporization type petroleum hot water supply device 1 in a low temperature environment will be described with reference to the flowchart shown in FIG. 2. When the outside air temperature is low in winter or the like, the operation switch 42 of the remote controller 41 is turned off. When the operation of the latent heat recovery vaporization type petroleum hot water supply device 1 is stopped for a long time, the temperature inside the latent heat recovery type vaporization type petroleum hot water supply device 1 is the outside air outside the latent heat recovery type vaporization type petroleum hot water supply device 1. Since the temperature approximates to that of the primary heat receiving pipe 23 and the secondary heat receiving pipe 25 and there is no flow of water, the water staying in the primary heat receiving pipe 23 and the secondary heat receiving pipe 25 may be frozen.

  Here, as described above, when the operation switch 42 of the remote controller 41 is turned off and the operation of the latent heat recovery vaporization type petroleum hot water supply device 1 is stopped, the temperature detection means 37 (heat exchange outlet temperature sensor) detects. When the temperature to be detected is detected as -5 ° C., which is a preset predetermined temperature at which there is a risk of freezing (step 45), the process proceeds to step 46 with YES, and the control means 40 is mixed with the vaporizer heater 4 which is a heater for heating. The chamber heater 6 is turned on, the control temperature of the heaters 4 and 6 is controlled to 130 ° C. to 140 ° C. by the vaporization temperature sensor 8, and the heat of the vaporizer 2 is transferred to the combustion unit 10 and the heat sink fins 12. The heat is efficiently radiated through the heat sink 10 and the heat absorbing fins 12, and the air on the combustion unit 10 is heated by the heat. The heated air rises into the combustion chamber 22 and heats the primary heat receiving pipe 23 and the secondary heat receiving pipe 25 located in the combustion chamber 22 above the combustion section 10, that is, above the burner 11. Thereby, it is possible to reliably prevent freezing of the water staying in the primary heat receiving pipe 23 and the water staying in the secondary heat receiving pipe 25, and the vaporizer heater provided in the vaporizer 2 for vaporizing the fuel oil. 4 and the mixing chamber heater 6 are used to prevent freezing, so that it is not necessary to provide a dedicated anti-freezing heater for preventing freezing of the water in the primary heat receiving pipe 23 and the secondary heat receiving pipe 25, thereby reducing the component cost. In addition, it is possible to eliminate the work of assembling the anti-freezing heater and to reduce the risk of component failure because it is not necessary to provide the anti-freezing heater.

  Next, when the outside air temperature further decreases to −10 ° C. in step 47, the process proceeds to step 48 in YES, and the control temperature of the heaters 4 and 6 is controlled to a high temperature of 170 ° C. to 180 ° C. by the vaporization temperature sensor 8. When the temperature detected by the temperature detecting means 37 is detected to be −3 ° C. in step 49, the control temperature returns to the original control temperature in step 46. Conversely, in step 50, the temperature detected by the temperature detecting means 37 further decreases to detect −20 ° C. Then, the process proceeds to step 51 with YES, and the control temperature of the heaters 4 and 6 is controlled to a higher temperature of 220 ° C. to 225 ° C. by the vaporization temperature sensor 8, but the detected temperature by the temperature detection means 37 is determined at step 52. When −8 ° C. is detected, the control temperature returns to the control temperature immediately before step 48. Next, when the outside air temperature reaches 3 ° C. in step 53, in step 54 it is temporarily frozen. Although the operation is stopped, in which as the freeze prevention operation if decreased ambient air temperature is intended to be resumed, without unnecessary power consumption efficiency is good and reliably antifreeze is performed again.

  The present invention is not limited to the embodiment described above. In this embodiment, the temperature detection means for detecting the antifreezing temperature is the heat exchange outlet temperature sensor 37, but the temperature detection means is Whether the water staying in the primary heat receiving pipe 23 and the secondary heat receiving pipe 25 may freeze when the outside air temperature is low and the operation of the latent heat recovery type vaporized petroleum water heater 1 is stopped in winter or the like What is necessary is just to be able to detect the temperature for judging whether or not, and instead of the heat exchange outlet temperature sensor 37, the water supply temperature sensor 35 and the hot water supply temperature sensor 38 in the latent heat recovery type vaporized hot water supply apparatus 1 are prevented from freezing. The temperature detecting means for detecting the temperature may be used, or a dedicated temperature sensor for detecting the ambient temperature in the latent heat recovery type vaporized petroleum hot water supply apparatus 1 may be provided and used as a temperature detecting means for detecting the anti-freezing temperature. good thing A.

  In the present embodiment, when the temperature detected by the heat exchange outlet temperature sensor 37 detects a preset anti-freezing temperature at which there is a risk of freezing, both the vaporizer heater 4 and the mixing chamber heater 6 are turned on. However, one of the vaporizer heater 4 and the mixing chamber heater 6 may be selected, or may be changed depending on the temperature detected by the temperature detecting means 37.

DESCRIPTION OF SYMBOLS 1 Vaporization type petroleum hot water supply device 2 Vaporizer 4 Vaporizer heater (heater for heating)
5 Mixing chamber 6 Mixing chamber heater (heater for heating)
7 Vaporizing section 10 Combusting section 11 Burner 16 Combustion fan 23 Primary heat receiving pipe 24 Primary heat exchanger 37 Heat exchange outlet temperature sensor (temperature detecting means)
40 Control means 41 Remote control 42 Operation switch

Claims (1)

A burner comprising a heater for heating and vaporizing fuel, a vaporization temperature sensor for detecting the temperature of the vaporization unit, and a combustion unit for burning the fuel vaporized by the vaporization unit, and a burner A combustion fan that supplies combustion air, a primary heat exchanger that recovers sensible heat from the combustion gas generated by the combustion of the burner and heats the water flowing through the primary heat receiving pipe, and temperature detection that detects a predetermined temperature for freezing prevention means and, and a control means for the temperature in which the vaporization temperature sensor is detected to control the heater to a predetermined control temperature range, evaporative placing the said primary heat exchanger above the burner When the operation switch of the remote controller for remotely operating the vaporizing oil hot water supply apparatus is turned off and the operation of the vaporizing oil hot water supply apparatus is stopped, the temperature detecting means is the oil hot water supply apparatus. When a predetermined temperature for prevention is detected, the control means turns on the heater for anti-freezing operation, and the detected temperature of the temperature detecting means is within the predetermined control temperature range during this anti-freezing operation. A vaporizing petroleum hot water supply apparatus characterized in that the heating heater is controlled so as to become higher as it becomes lower.

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