TWI398608B - Safety inspection method of water heater - Google Patents

Description

Water heater safety detection method

The invention relates to a water heater, and more particularly to a method for detecting safety of a water heater.

After the water heater is used for a period of time, it is often caused by the increase of the number of uses or the setting environment, so that the internal parts are prone to aging or damage, and the aging or damaged parts will cause the heating efficiency of the water heater to decrease. When the water heater reaches the preset use temperature, it will inevitably supply more gas for heating, but this situation will consume more gas, which will also increase the heating cost.

In addition, aging or damage to the machine may also result in incomplete combustion of the gas and the possibility of carbon monoxide production. Moreover, when the machine is damaged, there is a risk of gas leakage, which may cause a gas explosion. It can be seen from the above that when the water heater has aging or damage to the internal parts, not only the combustion efficiency is not good, but also the safety of the human body.

In view of this, the main object of the present invention is to provide a method for detecting safety of a water heater by detecting whether the heating efficiency of the water heater is normal or not, and as a basis for detecting whether the internal mechanical parts are aging or damaged, for the purpose of safety detection. .

In order to achieve the above object, the water heater safety detecting method provided by the present invention has a water pipe, a heating unit for heating water in the water pipe, and a gas supply unit for supplying gas to the heating unit. And a detection unit for monitoring water temperature changes; the security detection method comprises the following steps:

First set a use temperature, and detect the inlet water temperature and water flow rate of one of the water inlets of the water pipe, and calculate the heating temperature and the water flow rate by using the above-mentioned use temperature, water inlet temperature and water flow as parameters. The water in the water pipe is heated to the amount of gas required for the use temperature to obtain a desired total amount of gas. Then, the gas supply unit supplies gas to the heating unit one by one, and detects the water outlet temperature of one of the water outlets when the gas supply reaches the total amount of the desired gas, and when the water temperature does not reach the use temperature, A temperature difference ratio between the temperature of the water outlet temperature and the water inlet temperature and the temperature of the water inlet temperature is detected, and if the temperature difference ratio is less than a predetermined value, the detecting unit sends a processing signal, and the processing signal is available. In order to activate the warning or to control the interruption of the supply of gas, or both are activated at the same time.

In order to achieve the above object, the present invention further provides a safety detecting method, that is, when the water outlet temperature of the water outlet of the water pipe does not reach the use temperature, the gas supply unit continues to supply a gas compensation amount to the heating unit until the water is discharged. The temperature reaches the use temperature, and the total heat value of the actual gas supply amount heated to the use temperature and the total heat value of the ideal gas total is calculated as an efficiency ratio. If the efficiency ratio is less than a reference value, then the ratio is The detecting unit sends out the processing signal.

In order that the present invention may be more clearly described, the preferred embodiments are illustrated in the accompanying drawings.

First, the structure of the water heater 1 used in the preferred embodiment of the present invention will be briefly described, and the method for achieving the purpose of the safety inspection will be described later.

The water heater 1 shown in the first figure comprises a temperature setting unit 10, a water pipe 20, a heating unit 30, a gas supply unit 40, two temperature detectors 50, 51, a water flow detector 60, and a water heater. The controller 70 and a warning device 80. The water supply pipe 20 has a water inlet 20a and a water outlet 20b. The gas supply unit 40 includes a gas pipe 42 and a gas proportional valve 44 disposed on the gas pipe 42. The gas proportional valve 44 has an adjustment supply. The "gas flow rate control valve" shown in the U.S. Patent Publication No. 20090206291A1 filed by the applicant, which utilizes the current supply to cause the valve to be proportionally opened, that is, when the current is supplied The valve opening degree is proportionally increased, and the gas flow rate provided is also proportionally increased. Of course, in design, other mechanism designs can also be utilized, such as a rotary dislocation opening method, as long as it can be controlled and calculated. The controller 70 has a calculation unit 71 and a detection unit 72.

The second figure is a flowchart of the security detection of the preferred embodiment of the present invention, and the steps thereof include:

First, the temperature setting unit 10 is set to a desired fixed value use temperature, and the subsequent water temperature control is performed based on the use temperature.

The temperature detector 50 and the water flow detector 60 are installed on the water inlet pipe 101 adjacent to the water inlet 20a. When the user activates the water heater 1, the temperature detector 50 and the water flow detector The detector 60 immediately detects the inlet water temperature and the water flow rate at the water inlet 20a, and the calculation unit 71 of the controller 70 takes the above-mentioned use temperature, the inlet water temperature and the water flow rate as parameters, and calculates the heating for a predetermined time. The unit 30 heats the water in the water pipe 20 to the total heating value required for the use temperature, and converts a desired total amount of gas. The above formula for calculating the total calorific value is as follows:

Specific heat of water* (use temperature - inlet water temperature) * water flow rate * predetermined time = total calorific value

After the calculation is completed, the controller 70 issues a control signal to the gas proportional valve 44 for supplying the total amount of ideal gas to the heating unit 30 in a predetermined amount of time for a predetermined time. The heating unit 30 receives the gas. Thereafter, the water in the water pipe 20 is heated.

The temperature detector 51 is installed on the water outlet pipe 102 adjacent to the water outlet 20b. When the gas supply reaches the total amount of the desired gas, the temperature detector 51 immediately detects the water temperature, and when the water temperature reaches the use temperature. The gas supply unit 40 controls the gas to be quantitatively outputted to maintain the outlet water temperature; if the outlet water temperature does not reach the use temperature, the calculation unit 71 detects the current outlet water temperature and the inlet water temperature by the temperature detector 51. The temperature difference is divided by the temperature difference between the use temperature and the inlet water temperature, and a temperature difference ratio is calculated.

After the calculation is completed, the temperature difference ratio is compared with a first predetermined value built in the detecting unit 72. If the temperature difference ratio is less than the first predetermined value, the detecting unit 72 sends a first processing signal. The warning device 80 is configured to generate a warning message to notify the user that the water heater 1 is abnormal. The first predetermined value is 0.9 in the embodiment, which represents that the internal components of the water heater 1 have been slightly aged or damaged. Then, the calculated temperature difference ratio value is further compared with a second predetermined value. If the temperature difference ratio is less than the second predetermined value, the detecting unit 72 sends the second processing signal and controls the gas proportional valve 44 to block. In the present embodiment, the second predetermined value is 0.7, which represents that the internal parts of the water heater 1 are seriously deteriorated or damaged, and there is an immediate danger, so that the gas is blocked in time. For transportation, it can be safe. Moreover, if the temperature difference ratio is between the first predetermined value and the second predetermined value, the heating unit 30 continues to heat, and after the outlet water temperature reaches the use temperature, the gas supply unit 40 controls the gas to be quantitatively outputted. Maintain the water temperature.

It should be noted that the values of the first predetermined value and the second predetermined value may be appropriately changed according to the environment or the demand, and are preset before the water heater 1 is shipped from the factory.

In addition to the above methods, the present invention further provides a security detection method, which is shown in the third figure, and the security detection method disclosed therein is different from the above embodiment in that:

In the method of the embodiment, after the gas supply has reached the total amount of the desired gas, and the outlet water temperature does not reach the use temperature, the gas supply unit 40 continues to supply a gas compensation amount to the heating unit 30 until the outlet temperature reaches the use. Temperature, after that, the calculation unit 71 divides the total heating value of the ideal gas total by the total heating value of the actual gas supply amount, and calculates an efficiency ratio, which is the heating from the water inlet temperature to the use temperature. The amount of gas actually consumed.

The efficiency ratio is further compared with a first reference value and a second reference value built in the detecting unit 72. If the value is smaller than the first reference value, the detecting unit 72 sends a processing signal to the warning device 80. A warning message is generated; if less than the second reference value, the detecting unit 72 controls the gas proportional valve 44 to block the supply of gas. Further, when the efficiency ratio is between the first reference value and the second reference value, the gas supply unit 40 controls the gas to maintain the outlet water temperature by the quantitative output. It must be noted that the aforementioned first reference value is exemplified by 0.9, which represents that a slight aging or damage has occurred in the heat exchange mechanism in the water heater 1. The second reference value is exemplified by 0.7, which represents that the heat exchange mechanism in the water heater 1 has severe aging or damage.

In addition, in order to make the security detection more accurate, please refer to the fourth figure, which is a flowchart of the security detection method according to the third preferred embodiment of the present invention. The embodiment is combined with the foregoing first embodiment and the second embodiment. Know the method and use it as the basis for safety detection. That is, when the gas supply reaches the total amount of the desired gas, but the outlet water temperature does not reach the use temperature, first calculate and determine whether the temperature difference ratio is less than the predetermined value, and if the condition for stopping the supply of gas to the heating unit 30 is not reached, The gas supply compensation amount is continuously supplied to the heating unit 30 for heating and heating until the outlet water temperature reaches the use temperature, and accordingly, it is calculated and determined whether the efficiency ratio is smaller than the reference values. Thereby, when one of the efficiency ratio and the temperature difference ratio of the water heater 1 meets the condition of stopping the supply of gas to the heating unit 30, the detecting unit 72 sends the processing signal to control the gas proportional valve 44 to block the gas supply path. In order to make the user more secure when using the water heater 1.

The above description is only a few preferred embodiments of the present invention, and the equivalent structures and manufacturing methods of the present invention and the scope of the patent application are intended to be included in the scope of the present invention.

1. . . Water heater

10. . . Temperature setting unit

20. . . Water pipe

20a. . . water intake

20b. . . Outlet

30. . . Heating unit

40. . . Gas supply unit

42. . . Gas tube

44. . . Gas proportional valve

50, 51. . . Temperature detector

60. . . Water flow detector

70. . . Controller

71. . . Computing unit

72. . . Detection unit

80. . . Warning device

101. . . Water inlet pipe

102. . . Outlet pipe

The first figure is a schematic structural view of the water heater of the present invention.

The second figure is a flow chart of the security detection method of the first preferred embodiment of the present invention.

The third figure is a flowchart of a security detection method according to a second preferred embodiment of the present invention.

The fourth figure is a flowchart of a security detecting method according to a third preferred embodiment of the present invention.

This representative diagram is a flow chart, so there is no component symbol.

Claims (12)

A safety detecting method for a water heater, the water heater having a water pipe, a heating unit for heating water in the water pipe, a gas supply unit for supplying gas to the heating unit, and a detecting unit for monitoring The water temperature change; the safety detection method comprises the steps of: setting a use temperature; detecting a water inlet temperature and a water flow of the water inlet of the water pipe; calculating an ideal gas volume, wherein the ideal gas amount is The use temperature, the inlet water temperature and the water flow rate are parameters, and the heating unit heats the water in the water pipe to the amount of gas required for the use temperature for a predetermined time; the gas supply unit supplies the gas to the heating. The unit detects the water temperature of the water outlet of one of the water pipes when the gas supply reaches the total amount of the gas, and detects the temperature difference and the temperature difference between the water temperature and the water temperature when the water temperature does not reach the use temperature. Calculating a temperature difference ratio between the temperature and the temperature difference of the water inlet temperature, if the temperature difference ratio is less than a predetermined value, the detecting unit sends a processing signal, The process to start as a warning signal, or to interrupt the gas supply to lose. The method for detecting the safety of the water heater according to claim 1, wherein the predetermined value is set to 0.9, and when the temperature difference ratio is less than 0.9, the detecting unit sends the processing signal to one of the warning units of the water heater to activate the warning function. The method for detecting safety of a water heater according to claim 1, wherein the predetermined value is set to 0.7, and when the temperature difference ratio is less than 0.7, the detecting unit sends the processing The signal is supplied to the gas supply unit of the water heater, and the gas proportional valve of one of the gas supply units is controlled to block the gas supply. According to the safety detection method of the water heater according to claim 1, when the outlet water temperature of the water outlet of the water pipe does not reach the use temperature, the gas supply unit continues to supply a gas compensation amount to the heating unit until the water temperature reaches the use temperature. At this time, an efficiency ratio is calculated from the total calorific value of the actual gas supply amount heated to the use temperature and the total calorific value of the ideal gas total amount, and if the efficiency ratio is less than a reference value, the detection is performed. The unit sends out the processing signal. The method for detecting the safety of the water heater according to claim 4, wherein the set reference value is 0.9, and when the efficiency ratio is less than 0.9, the detecting unit sends the processing signal to one of the warning units of the water heater to activate the warning function. The method for detecting safety of a water heater according to claim 4, wherein the reference value is set to 0.7, and when the efficiency ratio is less than 0.7, the detecting unit sends the processing signal to the gas supply unit of the water heater, and accordingly controls The gas supply unit is a gas proportional valve that blocks gas supply. A safety detecting method for a water heater, the water heater having a water pipe, a heating unit for heating water in the water pipe, a gas supply unit for supplying gas to the heating unit, and a detecting unit for monitoring The water temperature change; the safety detection method comprises the steps of: setting a use temperature; detecting a water inlet temperature and a water flow of the water inlet of the water pipe; calculating an ideal gas volume, wherein the ideal gas amount is Above use temperature Degree, water inlet temperature and water flow rate as parameters, calculating the amount of gas required for the heating unit to heat the water in the water pipe to the use temperature for a predetermined time; the gas supply unit supplies gas to the heating unit by volume; When the gas supply reaches the total amount of the desired gas, the outlet water temperature of one of the water outlets of the water pipe is detected, and when the water temperature does not reach the use temperature, the gas supply unit supplies a gas compensation amount to the heating unit until The outlet water temperature reaches the use temperature, and an efficiency ratio is calculated from the total calorific value of the actual gas supply amount heated to the use temperature and the total calorific value of the ideal gas amount, and if the efficiency ratio is less than a reference value, The detecting unit sends out a processing signal, and the processing signal is used to activate the warning function or to interrupt the gas supply. The method for detecting the safety of the water heater according to claim 7, wherein the set reference value is 0.9, and when the efficiency ratio is less than 0.9, the detecting unit sends the processing signal to one of the warning units of the water heater to activate the warning function. The method for detecting safety of a water heater according to claim 7, wherein the set reference value is 0.7, and when the efficiency ratio is less than 0.7, the detecting unit sends the processing signal to the gas supply unit of the water heater, and accordingly controls The gas supply unit is a gas proportional valve that blocks gas supply. According to the safety detection method of the water heater according to claim 7, when the water outlet temperature of the water outlet of the water pipe does not reach the use temperature, the temperature difference between the water temperature and the water temperature at the time and the temperature difference between the water temperature and the water temperature are detected first. A temperature difference ratio is calculated. If the temperature difference ratio is less than a predetermined value, the detecting unit sends the processing signal. The method for detecting the safety of the water heater according to claim 10, wherein the predetermined value is set to 0.9, and when the temperature difference ratio is less than 0.9, the detecting unit sends the processing signal to one of the warning units of the water heater to activate the warning function. The method for detecting safety of a water heater according to claim 10, wherein the predetermined value is set to 0.7, and when the temperature difference ratio is less than 0.7, the detecting unit sends the processing signal to the gas supply unit of the water heater, and accordingly controls The gas supply unit is a gas proportional valve that blocks gas supply.