KR20130092147A - Method for preventing freezing of gas heater - Google Patents

Abstract

PURPOSE: A method for doubly preventing gas heaters from freezing is provided to improve marketability of products and reliability relative to prevent from freezing by rapidly corresponding to an external temperature in a wide range. CONSTITUTION: A method for doubly preventing gas heaters from freezing comprises the steps of: continuously driving an electric heater until an external temperature is higher than a second temperature if an external temperature is lower than a first temperature (S2); starting an operation after a freezing prevention standby timer is reset if the external temperature is lower than the second temperature and determining whether a tapping temperature of a heat exchanger is higher than a third temperature or same (S6); firstly determining whether the tapping temperature of the heat exchanger is higher than a fourth temperature or same if the tapping temperature is higher than the third temperature or same (S7); determining whether or not a time which is predetermined by the freezing prevention standby timer is finished if the tapping temperature is lower than the fourth temperature or same (S8); repetitively determining whether the tapping temperature is lower than the fourth temperature or same if the predetermined time is finished (S9); and starting a freezing prevention operation to drive a burner for a time which is set by a combusting timer to prevent from freezing if the tapping temperature is lower than the fourth temperature as a result of the determination of the tapping temperature (S10). [Reference numerals] (AA) Start; (S1) External temperature < first temperature; (S10) Starting to operate a freezing prevention combusting timer; (S11) Ending the freezing prevention combusting timer; (S12) Ending a burner combustion; (S13) Freezing error; (S2) Driving an electric heater; (S3) External temperature > second temperature; (S4) Electric heater 'off'; (S5) Freezing prevention standby timer reset/operation start; (S6) Tapping temperature >= third temperature; (S7,S9) Tapping temperature >= fourth temperature; (S8) Ending the freezing prevention standby timer

Description

Method for preventing freezing of gas heater

The present invention relates to a method for preventing double freezing of a gas water heater, and more particularly, in a gas water heater having an electric heater for freezing prevention in a hot water discharge pipe, the temperature of the outside air is less than or equal to the first temperature, so that the temperature of the outside air is high even though the electric heater generates heat. If the temperature of the hot water is low enough to lower the temperature below the predetermined temperature and the freezing of the parts except the mounting position of the electric heater cannot be solved, the freezing prevention combustion through the burner is executed for a predetermined time together with the operation of the electric heater. If the temperature is very low below the set temperature, it not only generates a freeze error signal but also prohibits the operation of the gas water heater so that the user can recognize the state of the gas water heater and respond safely. Breakage or damage to discharge pipe or heat exchanger To the invention to prevent in advance.

In other words, according to the present invention, when the gas water heater is not used by applying a three-step freeze prevention method leading to an electric heater and a freeze protection combustion and a freezing error, the water inside the hot water discharge pipe in the water heater is lowered to within the first temperature. In order to prevent freezing, the electric heater using the mechanical bimetal is heated in one step, and when the temperature decreases or the mechanical bimetal is broken despite the heating of the electric heater as described above, the two-stage freeze prevention combustion is performed to execute the hot water discharge pipe. If the water temperature drops because the gas valve is locked and does not burn when the above two steps are executed, the water heater operates in the frozen state by executing a three-stage complete freezing error. Prohibit the operation of the water heater to prevent it from happening. It relates to a water discharge pipe or a heat exchanger such as a broken or prevent freezing of the gas water heater double invention to prevent damage from occurring in the method.

In general, a gas water heater is a device for boiling water by burning gas, and instantaneous type can obtain hot water immediately in a desired amount, and the device has a small size and thermal efficiency, and a storage type stores hot water at a constant temperature. It is mainly used in restaurants and baths.

On the other hand, in the hot water discharge pipe of the gas water heater as described above, the electric heater for freezing prevention to prevent the hot water discharge pipe is frozen when detected that the temperature of the outside air is lowered below a predetermined temperature (for example +4 ℃ ~ +6 ℃) Has a configuration provided.

That is, freezing prevention of most gas water heaters in the related art is freezing prevention using an electric heater.

However, such a conventional gas water heater is a freeze protection device using only an electric heater of the on / off control method by a mechanical switch, and thus the water heater can prevent the water heater from freezing when exposed to a very low temperature environment where freezing occurs even with the maximum capacity of the electric heater. There was a problem such that the water heater is not frozen, but the water heater does not detect this, and the user does not recognize the fact of freezing and the combustion is executed when the water heater is used.

1. Utility Model Publication of Korea 1986-000301 (March 13, 1986) 2. Korean Patent Publication No. 1995-0012779 (October 21, 1995)

The present invention has been made in order to solve such a conventional problem, the gas water heater equipped with an electric heater for freezing prevention in the hot water discharge pipe, if the temperature of the outside air is less than the first temperature using the electric heater 1 step freeze prevention operation Although the electric heater is driven as described above, when the tapping temperature of the heat exchanger is lower than the third temperature, a two-step freeze prevention operation is performed in which the burner is operated for a short time together with the operation of the electric heater. If the gas valve is locked or the gas does not enter in the process of performing the freezing prevention operation as described above, when the tapping temperature of the heat exchanger is detected below the fourth temperature, the freezing error signal is generated in three steps. By prohibiting the operation of the water heater, the copper generated by using only an electric heater in the past It can solve the freezing caused by lack of defect prevention ability, the user can accurately recognize the freezing state and the operating state of the gas water heater and take the necessary measures quickly and accurately, and can respond quickly to a wide range of outdoor temperature. The purpose of the present invention is to provide a double freezing prevention method for a gas water heater, which can greatly improve the reliability and marketability.

The present invention for achieving the above object, the outside air temperature detection sensor for detecting outside air; A water temperature detection sensor detecting a tapping temperature of the heat exchanger; A heat exchanger for heating hot water during combustion of the burner; An electric heater attached to an outside of the hot water discharge pipe connected to the heat exchanger and configured to generate heat in response to a driving signal generated by the controller when the outside air is lower than the first temperature to prevent freezing of the hot water discharge pipe; A control unit which performs an overall control function of the electric equipment installed in the gas water heater; An operation unit capable of inputting a desired operation signal by the user; In constructing a double freezing prevention method of a gas water heater having a display unit for displaying various state information of the gas water heater, it is determined whether the temperature of the outside air is lower than the first temperature, and if the outside temperature is lower than the first temperature, the outside air temperature is higher than the second temperature. Continuing to drive the electric heater until it is high; Although the electric heater is driven as described above, if the outside temperature is lower than the second temperature, the operation is started after resetting the freeze protection standby timer having a predetermined time and determining whether the tapping temperature of the heat exchanger is higher than or equal to the third temperature. Steps; Determining whether the temperature of the heat exchanger is lower than or equal to the fourth temperature when the tapping temperature of the heat exchanger is higher than or equal to the third temperature; Determining whether the time set by the freeze protection waiting timer has expired when the tapping temperature of the heat exchanger is lower than or equal to a fourth temperature; Determining whether the tapping temperature of the heat exchanger is lower than or equal to the fourth temperature when the time determined by the freezing prevention waiting timer is finished; And determining a tapping temperature of the secondary heat exchanger when the temperature is lower than or equal to the fourth temperature to perform a freezing prevention operation for driving the burner for a time installed by the freezing prevention combustion timer.

At this time, if the tapping temperature of the heat exchanger is lower than the third temperature after the freeze protection standby timer starts to operate, the display unit indicates that the freezing error state.

In addition, when the tapping temperature and the fourth temperature of the heat exchanger are first compared with each other, the tapping temperature of the current heat exchanger is higher than the fourth temperature, or even if the tapping temperature of the current heat exchanger is lower than or equal to the fourth temperature. If the state is set but the time set by the freeze protection standby timer is not finished, it is characterized by returning to the step of determining whether the tapping temperature of the heat exchanger is higher than or equal to the third temperature.

In addition, as a result of comparing the tapping temperature of the heat exchanger with the fourth temperature again, if the tapping temperature of the current heat exchanger is higher than the fourth temperature, the operation is started after resetting the anti-freezing standby timer having a predetermined time and then tapping the tapping of the heat exchanger. And returning to determining whether the temperature is higher than or equal to the third temperature.

In the above description, the first temperature is + 4 ° C to + 6 ° C, the second temperature is + 13 ° C to + 15 ° C, the third temperature is -3 to -1 ° C, and the fourth temperature is +1 to + 3 ° C. It is characterized by the above-mentioned.

In addition, the time set by the freeze protection standby timer is about 2-4 minutes, and the combustion time installed by the freeze prevention combustion timer is characterized in that 2-4 seconds.

As described above, according to the present invention, when the temperature of the outside air is less than or equal to the first temperature in the gas water heater equipped with the freezing prevention electric heater in the hot water discharge pipe, the first stage freezing prevention operation is performed until the second temperature is reached by using the electric heater. Although the electric heater is driven as described above, if the tapping temperature of the heat exchanger is lower than the third temperature, a two-step freeze prevention operation is performed in which the burner is operated for a short time together with the operation of the electric heater. If the gas valve is locked or the gas does not enter in the process of performing the freeze protection operation by using the electric heater and the burner as described above, the freezing error is detected when the tapping temperature of the heat exchanger is lower than the third temperature. It generates signals and prohibits the operation of water heaters. It is possible to solve the freezing caused by the lack of freeze protection ability caused by the system and at the same time, the user can accurately recognize the freezing state and the operating state of the gas water heater and take the necessary action quickly and accurately, especially at a wide range of outside temperature It is a very useful invention that can significantly improve the merchandise of the product as well as the reliability of freezing prevention.

1 is a block diagram of a gas water heater to which the method of the present invention is applied.
2 is a flowchart for explaining the method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a block diagram of a gas water heater to which the method of the present invention is applied, and FIG. 2 shows a flowchart for explaining the method of the present invention.

According to the present invention,

An outside air temperature detection sensor 1 for detecting outside air; A water temperature detection sensor 2 for detecting the tapping temperature of the heat exchanger; It is attached to the outside of the hot water discharge pipe connected to the heat exchanger that heats the hot water when the burner 8 burns, and when the outside air is below the first temperature (T1 ° C.), it generates heat in response to the driving signal generated by the controller 6. An electric heater 9 for preventing freezing of the discharge pipe; A controller 6 which performs an overall control function of the electric equipment installed in the gas water heater; An operation unit 3 capable of inputting a desired operation signal by the user; In constructing a double freezing prevention method of a gas water heater having a display unit 7 for displaying various state information of the gas water heater,

It is determined whether the temperature of the outside air is lower than the first temperature (T1 ° C), and if it is lower than the first temperature (T1 ° C), the electric heater 9 is continuously driven until the outside temperature is higher than the second temperature (T2 ° C). Performing a tea freeze protection operation;

Even though the electric heater 9 is driven as described above, if the outside temperature is lower than the second temperature (T2 ° C.), the freeze protection standby timer 4 having the predetermined time t1 is reset and operation starts. Determining whether the tapping temperature is higher than or equal to the third temperature T3;

Determining, if the tapping temperature of the heat exchanger is higher than or equal to the third temperature (T3 ° C.), whether the temperature is lower than or equal to the fourth temperature (T4 ° C.);

Determining whether the time t1 determined by the freeze protection waiting timer 4 ends when the tapping temperature of the heat exchanger is lower than or equal to a fourth temperature (T4 ° C.);

Determining whether or not the tapping temperature of the heat exchanger is lower than or equal to the fourth temperature (T4 ° C.) when the time t1 determined by the freezing prevention waiting timer 4 is finished;

As a result of determining the tapping temperature of the secondary heat exchanger as described above, if the temperature is lower than or equal to the fourth temperature (T4 ° C.), the double freezing prevention that drives the burner 8 for the time t2 installed by the antifreeze combustion timer 5 is performed. Performing operation; characterized in that consisting of.

At this time, after the freezing prevention waiting timer 4 starts to operate, it is determined that the tapping temperature of the heat exchanger is lower than the third temperature (T3 ° C.). .

In addition, when the tapping temperature of the heat exchanger and the fourth temperature (T4 ° C) are first compared with each other, the tapping temperature of the current heat exchanger is higher than the fourth temperature (T4 ° C), or even if the tapping temperature of the current heat exchanger is present. Is lower than or equal to the fourth temperature (T4 ° C), but the tapping temperature of the heat exchanger is higher than the third temperature (T3 ° C) when the time t1 set by the freeze protection wait timer 4 is not finished. Or returning to determining whether or not the same.

In addition, as a result of comparing the tapping temperature of the heat exchanger with the fourth temperature (T4 ° C) for the second time, if the tapping temperature of the current heat exchanger is higher than the fourth temperature (T4 ° C), the freezing prevention having a predetermined time t1 is performed. After the standby timer 4 is reset, the operation is started and the method returns to the step of determining whether the tapping temperature of the heat exchanger is higher than or equal to the third temperature (T3 ° C.).

In the above description, the first temperature (T1 ° C) is + 4 ° C to + 6 ° C, the second temperature (T2 ° C) is +13 to + 15 ° C, and the third temperature (T3 ° C) is -3 to -1 It is degree C and 4th temperature (T4 degreeC) is +1-+3 degreeC or more, It is characterized by the above-mentioned.

Further, the time t1 set by the freeze protection waiting timer 4 is about 2-4 minutes, and the combustion time t2 provided by the freeze prevention combustion timer 5 is 2-4 seconds.

Here, reference numeral 8a is a burner driver, and 9a is a heater driver.

Referring to the effect of the double freezing prevention method of the gas water heater of the present invention made as described above are as follows.

First, the controller 6 in the gas water heater to which the method of the present invention is applied has a first temperature (T1 ° C.) determined by detecting an outside temperature at a place where a gas water heater is currently installed when the outside temperature detection sensor 1 is normally supplied with power. It is determined whether the lower than (S1).

At this time, the first temperature (T1 ° C.) determined above may cause freezing.

As a result of judging the outside temperature at + 4 ° C to + 6 ° C as described above, when the temperature of the outside air is lower than + 4 ° C to + 6 ° C, which is the first temperature (T1 ° C), the hot water is burned when the burner 8 is burned. The main drives the electric heater 9 attached to the outside of the hot water discharge pipe connected to the heat exchanger to perform the first freezing prevention operation (S2).

While operating the electric heater (9) as described above while performing the freezing prevention operation for the hot water discharge pipe, the control unit (6) continues to detect the outside air temperature through the outside temperature detection sensor (1), the outside air temperature is zero It is judged whether it becomes higher than 2 temperature (T2 degreeC) (S3).

At this time, the second temperature (T2 ℃) is +13 ~ +15 ℃ without fear of freezing, as described above, if the temperature of the outside air while continuing to drive the electric heater 9 and performing the first freeze protection operation When the temperature is higher than +13 to + 15 ° C. (T2 ° C.) (Yes in S 3), the electric heater 9 is shut off (S 4) and the first freeze prevention operation using only the electric heater 9 is stopped. do.

However, if the outside air temperature is lower than the second temperature (T2 ° C) while performing the first freezing prevention operation using the electric heater 9 as described above, the freezing prevention having a predetermined time (t1) of about 2-4 minutes. After resetting the standby timer (4), the operation is started (S5) and the hot water temperature is detected through the water temperature detection sensor (2) installed in the heat exchanger, and the tapping temperature of the current heat exchanger is higher than the third temperature (T3) or It is determined whether or not the same (S6).

At this time, the third temperature (T3) is -3 ~ -1 ℃ which is a temperature that can be frozen even in the heat exchanger, the tapping temperature of the current heat exchanger and the third detected by the water temperature detection sensor 2 as described above As a result of comparing the temperature T3, if the tapping temperature of the current heat exchanger is higher than or equal to -3 to -1 ° C which is the third temperature (T3 ° C), whether the temperature is lower than or equal to the fourth temperature (T4 ° C) The first judgment is made (S7).

At this time, the fourth temperature (T4 ℃) is +1 ~ +3 ℃ or more that there is no fear of freezing the hot water in the heat exchanger, as described above mutually the tapping temperature of the current heat exchanger and the fourth temperature (T4 ℃) As a result of the comparison, if it is lower than or equal to +1 to + 3 ° C, which is the fourth temperature (T4 ° C), it is determined whether the time t1 determined by the freeze protection waiting timer 4 has ended (S8).

If 2-4 minutes, the time t1 determined by the cryopreservation wait timer 4, has elapsed while performing the above-described series of steps after the anti-freeze wait timer 4 starts to operate, the controller ( In 6), it is determined once again whether the current heat exchanger tapping temperature is lower than or equal to +1 to + 3 ° C which is the fourth temperature (T4 ° C) (S9).

As a result of comparing the current heat exchanger tapping temperature and the fourth temperature (T4 ° C.) again after the time t1 determined by the freeze protection waiting timer 4 has elapsed, the tapping temperature of the heat exchanger 4th temperature is determined. If it is lower than or equal to (T4 ° C.), it is determined that the hot water in the heat exchanger may be frozen, and the double freeze prevention for driving the burner 8 for the time t2 installed by the antifreeze combustion timer 5 is performed. The operation is performed (S10-S12).

At this time, the time t2 installed by the anti-freeze combustion timer 5 is a very short time within 2-4 seconds. The reason why the freeze prevention operation using the burner 8 is performed very short is the use of hot water. Because of this, there is a risk of freezing of the heat exchanger, so the freezing operation using the burner is performed, but if the heat exchanger is heated for a long time, the hot water in the heat exchanger may boil and deteriorate the heat exchanger. There is simply to be carried out so short that freezing does not occur.

On the other hand, when the freezing prevention waiting timer 4 starts to operate in the above, and after determining the tapping temperature of the heat exchanger (S6), if the temperature is lower than -3 ~ -1 ℃ of the third temperature (T3 ℃) already hot water discharge pipe Alternatively, if the heat exchanger is recognized as frozen and the burner 8 is forcibly operated in such a state, the secondary freezing prevention operation may cause damage or damage to the hot water discharge pipe or the heat exchanger. Blocking the operation of the anti-freezing operation in advance and displays the freezing error state on the display unit (7) (S13).

Therefore, the user can accurately recognize the frozen state and the operable state of the gas water heater and take the necessary measures accurately in a short time, thereby greatly improving the merchandise and reliability of the freezing prevention.

In addition, when the tapping temperature of the heat exchanger and the fourth temperature (T4 ° C) are first compared with each other (S7), the tapping temperature of the current heat exchanger is higher than the fourth temperature (T4 ° C) (S7). No), or when the tapping temperature of the current heat exchanger is lower than or equal to the fourth temperature (T4 ° C.), but the time t1 set by the freeze protection waiting timer 4 is not finished (No in S8). ), The process returns to the step of determining whether the tapping temperature of the heat exchanger is higher than or equal to the third temperature (T3 ° C), and thereafter, until the time t1 determined by the freeze protection waiting timer 4 ends. Repeat.

In addition, when the tapping temperature of the heat exchanger and the fourth temperature (T4 ° C.) are secondarily compared (S9), the tapping temperature of the current heat exchanger is higher than the fourth temperature (T4 ° C.) (No at S9). After resetting the freeze protection waiting timer 4 having a predetermined time t1, the operation is started and the process returns to step S5 to determine whether the tapping temperature of the heat exchanger is higher than or equal to the third temperature (T3 ° C). Repeat the steps of.

As described above, in the present invention, in the gas water heater having the electric heater 9 for freezing prevention in the hot water discharge pipe, when the temperature of the outside air is equal to or lower than the first temperature (T1 ° C), the second heater (T2 ° C) is used by using the electric heater 9. 1 step freeze prevention operation until it reaches, but the electric heater 9 when the tapping temperature of the heat exchanger is lower than the third temperature (T3 ℃) despite the electric heater 9 is driven as described above. In addition to the operation of the burner (8) for a short time to perform a two-step freeze protection operation, the gas valve in the process of performing the freeze protection operation by using the electric heater (9) and the burner (8) as described above If the tapping temperature of the heat exchanger is detected to be lower than the third temperature (T3 ° C) or lower because it is locked or gas does not come in, it generates a freezing error signal and prohibits the operation of the water heater. It can solve the freezing caused by the lack of freezing protection caused by the use, and at the same time, the user can accurately recognize the freezing state and the operating state of the gas water heater and take the necessary measures quickly and in particular, It can respond quickly to the road can significantly improve the reliability of the product as well as the freezing of the product.

It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

1: outside temperature detection sensor 2: water temperature detection sensor
3: control panel 4: freeze protection standby timer
5: freeze prevention combustion timer 6: control unit
7 display unit
8: burner 8a: burner drive unit
9: electric heater 9a: electric heater drive unit

Claims (4)

In the freezing prevention method of the gas water heater,
Determining whether the temperature of the outside air detected by the outside temperature detection sensor is lower than the first temperature, and if the temperature is lower than the first temperature, continuously controlling the electric heater until the outside temperature is higher than the second temperature;
Even though the electric heater is driven as described above, if the outside temperature is lower than the second temperature, the operation is started after resetting the freeze protection standby timer having a predetermined time and the tapping temperature of the heat exchanger detected by the water temperature detection sensor is the third temperature. Determining whether it is higher or equal;
Determining whether the temperature of the heat exchanger is lower than or equal to the fourth temperature when the tapping temperature of the heat exchanger is higher than or equal to the third temperature;
Determining whether the time set by the freeze protection waiting timer has expired when the tapping temperature of the heat exchanger is lower than or equal to a fourth temperature;
Determining whether the tapping temperature of the heat exchanger is lower than or equal to the fourth temperature when the time determined by the freezing prevention waiting timer is finished;
Performing a freeze prevention operation of driving a burner for a time set by a freeze prevention combustion timer when the tapping temperature of the secondary heat exchanger is lower than or equal to a fourth temperature; and a gas water heater comprising: How to prevent double freezing The method according to claim 1,
When the tapping temperature of the heat exchanger is compared with the third temperature after the freezing prevention waiting timer starts to operate, when the tapping temperature of the heat exchanger is lower than the third temperature, the display unit indicates that a freezing error state is present. Preventing double freezing of gas water heaters.
The method according to claim 1,
Or when the tapping temperature of the heat exchanger is higher than the fourth temperature as a result of first comparing the tapping temperature and the fourth temperature of the heat exchanger;
Or if the tapping temperature of the heat exchanger is lower than or equal to the fourth temperature but the time set by the anti-freeze waiting timer is not finished, determining whether the tapping temperature of the heat exchanger is higher than or equal to the third temperature. Double freezing prevention method of the gas water heater, characterized in that the return to.
The method according to claim 1,
As a result of comparing the tapping temperature of the heat exchanger with the fourth temperature again, if the tapping temperature of the current heat exchanger is higher than the fourth temperature, the operation is started after resetting the freeze protection standby timer having a predetermined time and the tapping temperature of the heat exchanger is And returning to a step of determining whether the temperature is higher than or equal to the third temperature.

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