CN108302770A - Automatic anti-freezing method for zero-cold-water gas hot water system - Google Patents

Abstract

The invention discloses an automatic anti-freezing method for a zero-cold-water gas hot water system, which comprises the following steps of: a temperature controller is arranged on a pipeline of the gas water heater in advance and used for detecting whether the current temperature is lower than the anti-freezing temperature or not, and the temperature controller is electrically connected with the controller to feed back a detection result and enable the gas water heater to keep a ventilation and power-on state; when the controller recognizes that the temperature controller is triggered, starting the circulating water pump to enable water stored in the gas water heater to circularly flow, and continuously detecting whether the temperature controller is restored to the initial state; if the temperature controller returns to the initial state, the controller stops operating the circulating water pump; otherwise, when the running time of the circulating water pump exceeds the preset time T, the temperature controller is still in a trigger state, and the controller drives the gas water heater to enter a heating state until the temperature controller returns to an initial state. The invention directly monitors the temperature closest to the lowest temperature point of the water pipe, automatically and accurately controls the anti-freezing heating of the water heater, and is safe and reliable.

Description

An automatic antifreeze method for zero cold water gas hot water system

technical field

The invention relates to a gas water heater, in particular to an automatic antifreeze method for a zero cold water gas hot water system.

Background technique

Compared with storage-type electric water heaters, gas water heaters have many advantages such as good comfort, low cost of use, convenience, energy saving and environmental protection. However, due to certain deficiencies in antifreeze technology, it is difficult for this product to be widely promoted in northern regions.

The main reason for the freezing of gas water heaters is: when the water heater stops working, the outdoor cold air below 0°C flows back into the gas water heater along the exhaust pipe of the water heater, and the water stored in the water pipe of the gas water heater freezes and expands, causing the water pipe in the water heater to expand. crack and damage the water heater.

There are three main antifreeze technologies for traditional gas water heaters: one is manual antifreeze, which requires the user to close the water heater inlet valve, open the water point water valve after using the water heater, and then unscrew the water heater drain valve to discharge the water stored in the water heater. , this scheme is feasible, but it is prone to user negligence in the actual operation process, and the reliability is poor; the second is to install an anti-backflow check valve at the exhaust pipe to prevent cold air from flowing backward from the exhaust pipe of the water heater, but this structure It is difficult to completely avoid the backflow of cold air, and the reliability is insufficient; the third is electric heating. The jump thermostat is connected and powered on. Once the jump thermostat is closed, the ceramic electric heating block will heat the water pipe of the water heater immediately until the jump thermostat is disconnected. This method has low electric heating efficiency. , and limited by electric heating power, it is not suitable for areas with very low temperature in winter.

Zero-cold water gas water heater is one of the important directions of domestic gas instant water heater technology development in recent years. It is characterized by adding circulating water pump and other components inside the existing constant temperature gas water heater. After the zero-cold water function is started, the circulating water pump runs immediately, and the gas water heater starts to heat up, heating the stored water in the hot water circulation pipe outside the water heater, which ensures that when the user turns on the hot water tap at any time, he can immediately use hot water at a suitable temperature.

However, for gas water heaters that have not activated the zero-cooling water function, there is still the problem of cracking of the water pipes in the water heater at low temperatures. However, the existing zero-cold water gas water heater antifreeze technology, in addition to the water heater antifreeze technology mentioned above, there is another method: An antifreeze button is added to the gas water heater. After the antifreeze button is activated, the water heater will start the circulating water pump regularly. By testing the water temperature at the temperature probe at the outlet pipe of the water heater, once the temperature is lower than the set temperature, the antifreeze heating will be automatically started. The main disadvantage of this method is that it is difficult for the user to control the appropriate timing to turn on the antifreeze function. Start the water heater antifreeze function during antifreeze, which also causes waste of electricity.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a safe, reliable, energy-saving automatic antifreeze method for zero cold water gas hot water system.

The technical scheme adopted in the present invention is:

An automatic antifreeze method for a zero cold water gas hot water system, comprising the following steps:

Install a thermostat on the pipeline of the gas water heater in advance. The thermostat is used to detect whether the current temperature is lower than the antifreeze temperature. The thermostat is electrically connected to the controller to feed back the detection results and keep the gas water heater in a ventilated and energized state;

When the controller recognizes that the thermostat is triggered, it will start the circulating water pump to circulate the stored water in the gas water heater, and continue to detect whether the thermostat has returned to its initial state;

If the thermostat returns to the initial state, the controller stops running the circulating water pump; otherwise, when the operating time of the circulating water pump exceeds the preset time T, the thermostat is still in the trigger state, and the controller drives the gas water heater to enter the heating state until the thermostat recovers. initial state.

As a further optimization of the technical solution, the temperature controller is installed at the elbow of the finned heat exchanger on the pipeline of the gas water heater.

Preferably, the thermostat is a jump thermostat.

Preferably, the antifreeze temperature is a temperature value between 5 degrees Celsius and 8 degrees Celsius.

If the initial state of the thermostat is open, the trigger state is closed. Otherwise, the initial state of the thermostat is closed and the trigger state is open.

Beneficial effects of the present invention:

This invention is specially used for zero-cold water gas water heaters instead of electric water heaters. After the sudden jump thermostat is activated, the water circulation method is adopted first. The main purpose is to use the heat in the hot water in the pipeline as much as possible to ensure that the water heater will not be damaged by freezing. , reducing gas heating time and saving gas consumption. Until the circulating hot water in the memory is not enough to prevent freezing, then start the heating method to prevent freezing.

In addition, the present invention has a unique choice for the installation position of the thermostat, and directly monitors the temperature at the lowest temperature point of the water pipe (that is, at the elbow of the finned heat exchanger) to automatically and accurately control the antifreeze heating of the water heater, which is safe and reliable.

Description of drawings

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

Figure 1 is a schematic diagram of the installation position of the thermostat in the gas water heater;

Fig. 2 is the flow chart of the antifreeze method of the specific embodiment of the present invention.

Detailed ways

With reference to Fig. 1, shown in Fig. 2, be a kind of zero cold water gas hot water system automatic antifreeze method of the present invention, comprise the following steps:

Install a thermostat 100 on the pipeline of the gas water heater in advance, and the thermostat 100 is used to detect whether the current temperature is lower than the antifreeze temperature (the antifreeze temperature is a temperature value between 5 degrees Celsius and 8 degrees Celsius, which is far lower than that required by the zero cold water function. The temperature to be maintained is about 20 degrees Celsius), the thermostat 100 is electrically connected to the controller to feed back the detection results, and keeps the gas water heater in a ventilated and energized state;

When the controller recognizes that the thermostat 100 is triggered (closed), the circulating water pump is started to circulate the stored water in the gas water heater, and continues to detect whether the thermostat 100 returns to the initial state (disconnected); this step does not heat immediately but The purpose is to choose circulating water storage, the purpose is to use the heat in the hot water in the pipeline as much as possible, and reduce the gas heating time and save gas consumption on the premise of ensuring that the water heater will not be damaged by freezing.

If the thermostat 100 returns to the initial state (disconnected), the controller stops the circulating water pump, indicating that the circulating water makes the water temperature at the detection position higher than the antifreeze temperature, and the threat of freezing cracks is temporarily exposed. Stopping the circulating water pump can realize a saving Electric energy; otherwise, when the operating time of the circulating water pump exceeds the preset time T, the thermostat 100 is still in the triggered state, and the controller drives the gas water heater to enter the heating state (ignition and gas combustion make the cold water in the heat exchanger warm up), until the thermostat 100 restores the initial state (disconnected), and re-detects the temperature of the pipeline in the next cycle, realizing the second saving of gas and electric energy.

As a further optimization of this technical solution, the thermostat 100 is installed at the elbow of the finned heat exchanger on the pipeline of the gas water heater. The position of the hot water outlet pipe 200 detected by the water heater is the position closest to the lowest temperature point of the water pipe (higher than the position of the hot water outlet pipe 200 and located outside the water heater shell). Since the cold air flows back into the room through the smoke pipe and the water heater, In the process of backflow of cold air, it first contacts the finned heat exchanger, and the water is not able to conduct heat. At this time, the low temperature is conducted from the fins of the heat exchanger to the heat exchange tubes, and then the heat exchange tubes are conducted to the elbow of the water heater. Junction. Therefore, the pipeline water temperature at this position is used as a monitoring point, which can be detected more accurately for the implementation of subsequent antifreeze methods, and the safety and reliability are greatly increased.

In addition, the thermostat in this embodiment is preferably a snap thermostat, and other conventional known temperature detection devices that can replace the snap thermostat are also applicable to the present invention.

In this description, each embodiment focuses on the difference from other embodiments. The same and similar parts of the various embodiments are referred to each other. The various embodiments provided by the present invention can be combined in any way as required. The technical solution obtained by this combination is also within the scope of the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also includes these modifications and variations.

Claims (6)

1. a kind of zero cold water fuel gas water heating system automatic freezing-protective method, which is characterized in that include the following steps：

Temperature controller is installed on the pipeline of gas heater in advance, the temperature controller is for detecting whether Current Temperatures are less than antifreeze temperature Degree, temperature controller is electrically connected with controller to feed back testing result, and gas heater is made to keep ventilation, energized state；

When controller identification temperature controller is triggered, then start water circulating pump so that the water in gas heater circulates, And continue to detect whether temperature controller restPoses；

If temperature controller restPoses, controller shuts down water circulating pump；Otherwise it is more than when the water circulating pump duration of runs Temperature controller is still within triggering state when preset time T, and controller driving gas heater enters heated condition, until temperature controller It restPoses.

2. a kind of zero cold water fuel gas water heating system automatic freezing-protective method according to claim 1, it is characterised in that：The temperature Control the finned heat exchanger pipe bent position that device is mounted on gas heater pipeline.

3. a kind of zero cold water fuel gas water heating system automatic freezing-protective method according to claim 1 or 2, it is characterised in that：Institute It is Kick type temperature controller to state temperature controller.

4. a kind of zero cold water fuel gas water heating system automatic freezing-protective method according to claim 1, it is characterised in that：It is described anti- It is the temperature value between 5 degrees Celsius~8 degrees Celsius to freeze temperature.

5. a kind of zero cold water fuel gas water heating system automatic freezing-protective method according to claim 1, it is characterised in that：The temperature The original state for controlling device is to disconnect, and triggering state is to be closed.

6. a kind of zero cold water fuel gas water heating system automatic freezing-protective method according to claim 1, it is characterised in that：The temperature The original state for controlling device is to be closed, and triggering state is to disconnect.