KR960004844B1 - Hot water type heater - Google Patents

Abstract

The heater is composed of a heat exchanger(11), a hot water pipeline(4), a circulation pump(13), an operation control means(151), a safety observation means(152), an outdoor device(1) including a combustor(12) and an indoor device(2) including an indoor heat exchanger(21) and a ventilation fan(22). When the safety observation means(152) detects a malfunction in a freezing preventive operation, the operation control means stops only the combustor(12) to prevent the water from freezing by circulation.

Description

Hot water heater

1 is a schematic diagram illustrating the principle of a hot water heater according to an embodiment of the present invention.

2 is a flowchart for explaining the operation of the hot water heater in the freezing prevention operation.

3 is a graph for explaining the on / off operation of the circulation pump in the freezing prevention operation of the hot water heater.

* Explanation of symbols for main parts of the drawings

A: hot water heater 1: outdoor unit

2: Indoor unit 3: Hot water pipe (hot water pipe)

4: Hot water return pipe (hot water pipe) 11: Outdoor unit side heat exchanger

12 gas burner (combustion means) 13 circulation pump

21: indoor unit heat exchanger 22: convection fan (blower)

151: operation control unit (operation control means) 152: safety monitoring unit (safety monitoring means)

The present invention relates to a hot water heater that circulates hot water to perform heating.

Conventionally, an outdoor unit having a combustion means for heating an outdoor unit side heat exchanger, an indoor unit having a blower and an indoor unit side heat exchanger, a hot water pipe connected between the outdoor unit side heat exchanger and an indoor unit side heat exchanger, and a circulation pump for circulating circulating water, In the meantime, a transportation heater is known which performs a freezing prevention operation by operating a combustion means and a circulation pump during cold cooling. Normally, such hot water heaters are provided with safety monitoring means for monitoring the operation state of the heater, and the like. The safety monitoring means functions to stop operation when an abnormality is detected.

However, the above-described hot water heater has a problem in that when the abnormality is detected during the freezing prevention operation, the operation is stopped and the circulation water is frozen to damage the hot water pipe or the heat exchanger.

The present invention has been made in view of the above problems, and an object thereof is to provide a hot water heater capable of preventing freezing of circulating water without impairing safety when an abnormality occurs during freezing prevention operation.

In order to achieve the above object, the present invention provides an outdoor unit having an outdoor unit heat exchanger and combustion means for burning the outdoor unit side heat exchanger, and an indoor unit side heat exchanger and indoor air to suck the indoor unit side heat exchanger. An indoor unit having a blower for passing through the air, a hot water pipe for connecting each heat exchanger, a circulation pump disposed in the hot water pipe to circulate the circulating water, operation control means for controlling the operation of the combustion means and the blower and the circulation pump; And a safety monitoring means for monitoring the operation state of the heater, and when the safety monitoring means detects an abnormality during normal operation, the combustion means and the circulation pump are stopped at the same time, and the freezing prevention operation during cold When the safety monitoring means detects an abnormality, the combustion means is stopped and only the operation of the circulation pump is continued. The features.

According to the present invention configured as described above, when the safety detecting means detects an abnormality during normal operation, the operation control means stops the combustion means and the circulation pump at the same time.

In addition, during the cold operation, the operation control means operates the combustion means and the circulation pump so that the circulation water does not freeze, thereby raising the temperature of the circulation water to prevent freezing.

In addition, if the safety detecting means detects an abnormality during the anti-freezing operation, the operation control means stops the operation of the combustion means to ensure safety and continues only the operation of the circulation pump.

Therefore, if an abnormality occurs during the anti-freezing operation, the operation of the combustion means stops but the operation of the circulation pump continues, so that the circulating water can move in the hot water pipe or the heat exchanger to delay the freezing of the circulating water and ensure safety. Will be.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

The hot water heater (A) includes an outdoor unit (1) having an outdoor unit heat exchanger (11), a gas burner (12), a circulation pump (13), a pressure tank (14) and an outdoor controller (15), and an indoor unit side. An indoor unit (2) having a heat exchanger (21), a convection fan (22), and an indoor side controller (23), and a hot water transfer pipe (3) and a hot water return pipe (4), which are hot water pipes connecting the heat exchangers. Doing.

The outdoor unit side heat exchanger 11 is heated by a gas burner 121 whose combustion capacity is variable to make the circulating water supplied by the circulation pump 13 to hot water. Reference numeral 10 denotes a thermistor for detecting the water temperature of the antifreeze at the outlet of the outdoor unit side heat exchanger 11.

The gas burner 12 is composed of a gas burner 121, a frame rod, an electromagnetic valve, a gas pipe and an igniter (not shown).

The circulation pump 13 is installed in the hot water return pipe 4 on the upstream side of the outdoor unit side heat exchanger 11 so that the antifreeze is transferred to the outdoor unit side heat exchanger 11 → the hot water transfer pipe 3 → the indoor side heat exchanger 21. → circulate in the order of hot water return piping (4) → pressure tank (14).

The pressure tank 14 is installed in the hot water return pipe 4 on the upstream side of the circulation pump 13 to maintain the hydraulic pressure of the antifreeze supplied to the circulation pump 13 at a constant value.

The outdoor controller 15 controls and operates the gas burner 12 and the circulation pump 13 on the basis of the operation command signal transmitted from the indoor controller 23, and uses the operation status as the operation information signal. And a safety detecting unit 152 for checking the function of the outdoor unit 1 and sending out an abnormality detection signal to the indoor controller 23 when the abnormality is detected.

Normally, the abnormality of the outdoor unit 1 includes incombustibility of the gas burner 121, overheating, abnormality of the combustion fan, abnormality of the electromagnetic valve, and the like, which is detected by thermistor or thermocouple.

The convection fan 22 sucks indoor air as it rotates, passes the sucked air through the indoor air-side heat exchanger 21, and discharges it into the room with warm air.

The indoor controller 23 sets a known control temperature, a warm air flow amount, and the like, the operation command part 231 for sending the setting data to the operation command signal and sending it to the operation control part 151, an air control temperature, a warm air flow amount, and the like. And a display unit 232 indicating operation conditions of the gas burner 12, the circulation pump 13, the convection fan 22, and the like, and whether or not there is an error.

Next, the freezing prevention operation which is automatically performed in the cold state when the heating operation switch is in the off state will be described with reference to FIGS. 2 and 3.

In step S1, the operation control unit 151 determines whether or not the water temperature <-3 ° C and proceeds to step S2 when the hot water <-3 ° C (YES).

In step S2, the operation control unit 151 sets the gas burner 121 in the combustion state and the circulation pump 13 in the operating state, starts the 5-minute timer, and proceeds to step S3.

In step S3, when the safety monitoring unit 152 checks the function of the outdoor unit 1 and there is no abnormality (NO), the process proceeds to step S4. When abnormality is detected (YES), the process proceeds to step S6.

In step S4, it is determined whether 5 minutes have elapsed, and when 5 minutes have elapsed (YES), the process proceeds to step S5, and when 5 minutes has not elapsed (NO), the process returns to step S3.

In step S5, the operation control unit 151 closes the electromagnetic valve to extinguish the gas burner 121, stops the circulation pump 13, and then returns to step S1.

In step S6, the operation control unit 151 closes the electromagnetic valve to extinguish the gas burner 121 and proceeds to step S7.

In step S7, the operation control unit 151 determines whether hot water ≥-3 ° C, proceeds to step S8 when water temperature ≥-3 ° C (YES), and proceeds to step S9 when hot water <-3 (NO). .

In step S8, the operation control unit 151 stops the circulation pump 13 and proceeds to step S9.

In step S9, the operation control unit 151 determines whether the water temperature is ≤-6 ° C, and proceeds to step S10 when the water temperature is ≤-6 ° C (YES) and returns to step S7 when the water temperature is> -6 ° C (NO). .

In step S10, the operation control unit 151 sets the circulation pump 13 to an operating state, and returns to step S7.

On the other hand, when abnormality is detected during normal operation when the heating operation switch is on, the electromagnetic valve is closed to extinguish the gas burner 121, and the operation of the circulation pump 13 and the convection fan 22 is also stopped.

Next, the advantages of the hot water heater according to the present invention will be described.

(A) If an abnormality occurs in the function of the outdoor unit 1 during the anti-freezing operation, the safety monitoring unit 152 detects an abnormality, and the operation control unit 151 closes the electromagnetic valve to extinguish the gas burner 121 and circulate. The pump 13 is operated continuously or intermittently (see FIG. 3).

The antifreeze is moved from the outdoor unit heat exchanger 11 to the hot water transfer pipe 3 to the indoor side heat exchanger 21 to the hot water return pipe 4 to the pressure tank 14 to the circulation pump 13.

For this reason, although the gas burner 121 is in the extinguished state, freezing of the antifreeze may be prevented by stirring by moving. In addition, since the gas burner 121 is in a fired state, safety may be ensured.

(B) When an abnormality occurs during the freezing prevention operation and the gas burner 121 is in the extinguishing state, as shown in FIG. 3, the circulation pump 13 intermittently operates. For this reason, the heat generation of the circulation pump 13 is suppressed to the maximum, and the electric consumption can be saved.

The present invention includes the following embodiments in addition to the above examples.

In other words, in a case where the water temperature is low (e.g., -6 ° C or lower) when the abnormality occurs during the freezing prevention operation, the electric heater may be wound and energized to prevent the antifreeze from freezing.

Claims (1)

An outdoor unit having an outdoor unit heat exchanger and a combustion means for burning the outdoor unit heat exchanger to combust, an indoor unit side heat exchanger and an air blower that sucks the indoor air and passes the indoor unit side heat exchanger, each of the heat exchangers A hot water pipe to be connected, a circulation pump disposed in the hot water pipe to circulate the circulating water, operation control means for controlling the operation of the combustion means, the blower and the circulation pump, and safety monitoring means for monitoring the operation state of the heater; When the safety monitoring means detects an abnormality during normal operation, the combustion means and the circulation pump are stopped at the same time, and when the safety monitoring means detects an abnormality during the freezing prevention operation during cold freezing, the combustion means is removed. Hot water heater characterized in that the operation is stopped and only the operation of the circulation pump is continued.