An anti-freezing control method for a gas water heater

Abstract

The present invention discloses an anti-freezing control method for a gas water heater. Only when it is judged that the current water circuit of the gas water heater begins to freeze, the circulating heating is started to implement the secondary anti-freezing mode. Otherwise, only the water pump needs to be started for low-power operation to implement the initial anti-freezing mode. After the gas water heater circulates and heats, the pipeline is fully heated, and then it is in the initial anti-freezing mode for a long time and is not easy to enter the secondary anti-freezing mode again. The method is simple and reliable, and can intelligently judge whether the current water circuit begins to freeze according to different environments, so as to start the gas water heater for heating circulation work or start the water pump for low-power operation according to the judgment result, thereby effectively reducing the consumption of gas.

Description

Technical Field

[0001] The invention relates to the technical field of water heaters, and in particular to an antifreeze control method for a gas water heater. Background Art

[0002] In the related art, most zero-cold-water gas water heaters have water pumps that run to circulate water in the internal pipes. When the water heater detects a water flow signal, it starts heating. It usually takes 3-5 minutes to complete the circulation preheating (water heater inlet temperature = set temperature - insulation temperature difference (3-15 degrees), the longest cycle time is 5-15 minutes). After preheating, the entire pipe will become hot. When the ambient temperature is cold, when the water inlet, water outlet, and antifreeze temperature sensor temperatures of the water heater are low, the water heater may be at risk of freezing. The water pump can be started to run to circulate water in the internal pipes for heating to prevent the internal pipes of the water heater from freezing. Summary of the invention

[0003] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes an antifreeze control method for a gas water heater. The method is simple and reliable, and can intelligently judge whether the current water channel begins to enter a freezing state according to different environments, thereby starting the gas water heater to perform a heating cycle or starting the water pump to operate at a low power according to the judgment result, thereby effectively reducing gas consumption.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A method for controlling the freezing of a gas water heater, the method comprising:

[0006] The gas water heater is in standby mode;

[0007] Obtaining the current ambient temperature value of the gas water heater;

[0008] Comparing the ambient temperature value with a preset starting temperature value, and deciding to enter an initial antifreeze mode according to the comparison result;

[0009] After entering the initial antifreeze mode, the water pump is started to pump water according to the first preset power;

[0010] Detecting the return water volume of the gas water heater to obtain an actual circulation flow value;

[0011] Comparing the actual circulation flow value with the first preset flow value, and adjusting the power of the water pump according to the comparison result;

[0012] When the actual circulation flow value reaches the first preset flow value, obtaining the current actual power value of the water pump;

[0013] Compare the actual power value with the preset power condition, and decide to obtain the current ambient temperature value of the gas water heater again according to the comparison result;

[0014] Comparing the ambient temperature value with a preset secondary antifreeze condition, and deciding to enter a secondary antifreeze mode according to the comparison result;

[0015] After entering the secondary antifreeze mode, the water pump is started to pump water according to the second preset power, and the gas water heater performs heating according to the second preset flow value;

[0016] By comparing the inlet water temperature value with the preset water temperature value, the return to the initial antifreeze mode is determined based on the comparison result.

[0017] In some embodiments, the steps after the gas water heater performs heating according to the second preset flow value include:

[0018] After the gas water heater performs heating work according to the second preset flow value;

[0019] The return water volume of the gas water heater is detected again to obtain the actual circulation flow value;

[0020] The actual circulation flow value is compared with the preset flow condition, and the current inlet water temperature value is obtained according to the comparison result.

[0021] In some embodiments, the step of comparing the actual circulation flow value with the preset flow condition and determining to obtain the current inlet water temperature value according to the comparison result includes:

[0022] Determine whether the actual circulation flow value meets the preset flow condition, and the preset flow condition is that the actual circulation flow value is greater than the sum of the second preset flow value and the preset threshold value;

[0023] If yes, it is determined that there is water use action currently, and the water pump is turned off to exit the secondary antifreeze mode, so that the gas water heater enters the normal heating mode;

[0024] If not, it is determined that there is no water usage action at present, and the current inlet water temperature value is obtained.

[0025] In some embodiments, the step of comparing the ambient temperature value with a preset starting temperature value and determining to enter the initial antifreeze mode according to the comparison result includes:

[0026] Determining whether the ambient temperature value is less than a preset starting temperature value;

[0027] If yes, it enters the initial antifreeze mode;

[0028] If not, the preset starting temperature value is adjusted.

[0029] In some embodiments, the step of adjusting the preset starting temperature value includes:

[0030] Lowering the preset starting temperature value according to the first preset temperature adjustment value;

[0031] After a first preset time interval, obtaining the current ambient temperature value of the gas water heater again;

[0032] Determine whether the ambient temperature value is less than the lowered preset starting temperature value; if so, enter the initial antifreeze mode; if not, return to lower the preset starting temperature value again according to the first preset temperature adjustment value.

[0033] In some embodiments, the step of comparing the actual circulation flow value with the first preset flow value and adjusting the power of the water pump according to the comparison result includes:

[0034] Determining whether the actual circulation flow value is less than the first preset flow value;

[0035] If yes, increasing the power of the water pump according to a third preset proportional value;

[0036] If not, the power of the water pump is reduced according to a third preset proportional value.

[0037] In some embodiments, the step of comparing the actual power value with the preset power condition and determining to obtain the current ambient temperature value of the gas water heater again according to the comparison result includes:

[0038] After obtaining the current actual power value of the water pump;

[0039] Within the first preset time, collecting the plurality of actual power values ​​at intervals of a second preset time to obtain a first power data group;

[0040] Continuously collecting current power data, and correcting the first power data group collected last time according to the collected power data to obtain a second power data group, and calculating the sum of multiple actual power values ​​in the second power data group to obtain a first power sum value, and so on to obtain multiple power sum values ​​in sequence;

[0041] until the first power sum value is respectively less than any one of the multiple power sum values, obtaining the current actual power value of the water pump again;

[0042] Determine whether the current actual power value meets the preset power condition, and the preset power condition is that the current actual power value is less than the sum of the average value of the first power sum and the first preset ratio value; if so, obtain the current ambient temperature value of the gas water heater again; if not, lower the preset start temperature value according to the second preset temperature adjustment value.

[0043] In some embodiments, the step of lowering the preset start temperature value according to the second preset temperature adjustment value includes:

[0044] After lowering the preset starting temperature value according to the second preset temperature adjustment value;

[0045] After a first preset time interval, obtaining the current ambient temperature value of the gas water heater again;

[0046] Determine whether the ambient temperature value is less than the lowered preset starting temperature value; if so, enter the initial antifreeze mode; if not, return to lower the preset starting temperature value again according to the second preset temperature adjustment value.

[0047] In some embodiments, the step of comparing the actual power value with the preset power condition and determining to obtain the current ambient temperature value of the gas water heater again according to the comparison result includes:

[0048] Determine whether the current actual power value satisfies the preset power condition, and the preset power condition is that the current actual power value is greater than or equal to a second preset ratio value;

[0049] If yes, then obtaining the current ambient temperature value of the gas water heater again;

[0050] If not, the preset starting temperature value is lowered according to the second preset temperature adjustment value.

[0051] In some embodiments, the step of comparing the ambient temperature value with a preset secondary antifreeze condition and deciding to enter the secondary antifreeze mode according to the comparison result includes:

[0052] Determining whether the ambient temperature value satisfies the preset secondary antifreeze condition, and the preset secondary antifreeze condition is that the current ambient temperature value is less than the preset temperature value and lasts for a second preset time period;

[0053] If yes, it enters the secondary antifreeze mode;

[0054] If not, return to obtain the current ambient temperature value of the gas water heater again.

[0055] In some embodiments, the step of comparing the inlet water temperature value with the preset water temperature value and determining to return to the initial antifreeze mode according to the comparison result includes:

[0056] Determine whether the water inlet temperature value is greater than the preset water temperature value;

[0057] If yes, stop heating;

[0058] If not, the initial antifreeze mode is returned, and the acquired data is cleared to restore the gas water heater to the standby state.

[0059] Compared with the prior art, the present invention has at least the following beneficial effects:

[0060] 1. The antifreeze control method for the gas water heater of the present invention is simple and reliable. It can intelligently judge whether the current water channel begins to enter a freezing state according to different environments, and then start the gas water heater to perform a heating cycle or start the water pump to operate at a low power according to the judgment result, thereby effectively reducing the consumption of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is a schematic flow chart of an antifreeze control method in an embodiment of the present invention;

[0062] Figure 2 It is a schematic diagram of the structure of a gas water heater in an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of the technical solution for protection of the present invention.

[0064] like Figure 1 and 2As shown, the present embodiment provides an antifreeze control method for a gas water heater. Since there will be a certain amount of heat in the pipes of the gas water heater in the house, by gradually tightening the antifreeze entry conditions, the number of starts is significantly reduced and most of the time, heating cycle work is not required. When it is determined that the current water circuit of the gas water heater begins to freeze, it enters the circulation heating to achieve the secondary antifreeze mode. Otherwise, it only needs to start the water pump for low-power operation to achieve the initial antifreeze mode. After the gas water heater is circulated and heated, the pipes are fully heated, and then they are in the initial antifreeze mode for a long time, and it is not easy to enter the secondary antifreeze mode again. The method is simple and reliable, and it can intelligently judge whether the current water circuit begins to enter the freezing state according to different environments, so as to start the gas water heater for heating cycle work or start the water pump for low-power operation according to the judgment result, thereby effectively reducing gas consumption.

[0065] In this embodiment, the gas water heater has a water heater body 1, and the water heater body 1 is respectively connected with a water inlet pipe 11 and a water outlet pipe 12. The water heater body 1 is connected with an external water supply through the water inlet pipe 11 so that the external water supply supplies water to the water heater body 1, and it is connected with the hot water end of the external water point through the water outlet pipe 12 to output water to the outside, and the cold water end of the external water point is respectively connected with the external water supply and the water inlet pipe 11, and a return pipe is connected between the cold water end of the external water point and the water inlet pipe 11, so that the water stored in the pipeline is sequentially introduced into the water heater body 1 through the return pipe and the water inlet pipe 11, and the water in the water inlet pipe 12 is connected to the water inlet pipe 11. A water pump 2, a water flow sensor and a water inlet temperature sensor are respectively provided on the pipe 11. The water pump 2 is used to guide the stored water in the pipeline into the water heater body 1, and then the water is transported to the external pipeline through the water heater body 1. The water flow sensor is used to detect the water volume or return water volume on the water inlet pipe 11 to obtain the actual circulation flow value. At the same time, the water temperature on the water inlet pipe 11 is detected by the water inlet temperature sensor to obtain the water inlet temperature value, and an outlet water temperature sensor is provided on the water outlet pipe 12 to facilitate the detection of the outlet water temperature. Of course, a smoke exhaust pipe is also provided at the upper end of the water heater body 1. Secondly, an antifreeze temperature sensor is arranged in the water heater body 1 to detect the current ambient temperature of the gas water heater to obtain the ambient temperature value. Preferably, the antifreeze temperature sensor is arranged in the water heater body 1 at a position close to the exhaust pipe. When the gas water heater is installed indoors, the external cold air blows in and out through the smoke outlet of the exhaust pipe. Since the antifreeze temperature sensor is preferably arranged in the water heater body 1 and close to the exhaust pipe, the temperature here will be relatively low, and the antifreeze temperature sensor is not connected to the water, so that the antifreeze temperature sensor is a certain difference between the air temperature and the water temperature. In addition, the gas water heater also has a controller, which is electrically connected to the water heater body 1, the water pump 2, the water flow sensor, the water inlet temperature sensor, and the antifreeze temperature sensor, respectively, so as to control the water heater body 1, the water pump 2, the water flow sensor, the water inlet temperature sensor, and the antifreeze temperature sensor to respectively execute corresponding work instructions, or to realize the corresponding work instructions through the linkage between any two components.

[0066] Furthermore, the antifreeze control method of the gas water heater specifically includes the following steps:

[0067] Step S101, the gas water heater is in standby mode.

[0068] In this embodiment, the gas water heater is in standby mode and starts to ignite after detecting a water flow signal. After successful ignition, the constant temperature control program can be entered. If no water flow signal is detected, the valve is closed to turn off the flame and stop heating.

[0069] Step S102, obtaining the current ambient temperature value of the gas water heater.

[0070] In this embodiment, the gas water heater is in standby mode, and the controller controls the antifreeze temperature sensor to detect the current ambient temperature of the water heater body, so that the antifreeze temperature sensor obtains the current ambient temperature value of the gas water heater and feeds the obtained data back to the controller.

[0071] Step S103, comparing the ambient temperature value with the preset start temperature value, and deciding to enter the initial antifreeze mode according to the comparison result.

[0072] Specifically, determining whether the ambient temperature value is less than a preset start temperature value;

[0073] If yes, it enters the initial antifreeze mode;

[0074] If not, the preset starting temperature value is adjusted.

[0075] Furthermore, the step of adjusting the preset starting temperature value includes:

[0076] lowering the preset starting temperature value according to the first preset temperature adjustment value;

[0077] After a first preset time interval, the current ambient temperature value of the gas water heater is obtained again;

[0078] Determine whether the ambient temperature value is less than the lowered preset starting temperature value; if so, enter the initial antifreeze mode; if not, return to lower the preset starting temperature value again according to the first preset temperature adjustment value.

[0079] In this embodiment, the preset starting temperature value is pre-set to 7°C, but is not limited to the above temperature value, and other more suitable temperature values ​​can be selected according to actual needs. When the preset starting temperature value is pre-set to 7°C, the first preset temperature adjustment value is preferably 1°C, and the first preset time is preferably set to 10 minutes, thereby preventing the water pump from being damaged due to over-frequency starting. Of course, the first preset temperature adjustment value and the first preset time are not limited to the above settings, and other more suitable values ​​can be selected according to actual needs. More preferably, if the ambient temperature is greater than or equal to the preset starting temperature, the preset starting temperature is lowered according to the first preset temperature adjustment value. Since the preset starting temperature is pre-set to 7°C, the preset starting temperature after the first reduction is 6°C. After an interval of 10 minutes, determine again whether the current ambient temperature is less than the lowered preset starting temperature; if so, enter the initial antifreeze mode; if not, return to lower the preset starting temperature again according to the first preset temperature adjustment value, that is, lower the current preset starting temperature again according to the first preset temperature adjustment value to obtain the preset starting temperature after the second reduction. Since the current preset starting temperature is the preset starting temperature after the first reduction, the preset starting temperature after the second reduction is 5°C. This cycle is repeated until the ambient temperature is less than the preset starting temperature to enter the initial antifreeze mode, thereby completing the adjustment of the preset starting temperature.

[0080] Preferably, the judgment condition for entering the initial antifreeze mode can also be set as the following conditions:

[0081] When the ambient temperature is -5℃, water will freeze in 0.4 hours at the fastest. Therefore, when the preset startup temperature is less than -5℃ and the ambient temperature has not reached the preset startup temperature after 0.4 hours, the system will automatically enter the initial antifreeze mode.

[0082] When the ambient temperature is 0℃, water will freeze in 0.5 hours at the fastest. Therefore, when the preset start temperature value is less than 0℃ and the ambient temperature value has not reached the preset start temperature value after 0.5 hours, the system will automatically enter the initial antifreeze mode.

[0083] Since water will freeze in as fast as 1 hour when the ambient temperature is 3°C, when the preset start temperature is less than 3°C and continues for 1 hour, and the ambient temperature has not reached the preset start temperature, the system automatically enters the initial antifreeze mode.

[0084] Step S104, after entering the initial antifreeze mode, starting the water pump to pump water according to the first preset power.

[0085] In this embodiment, after entering the initial antifreeze mode, the water pump is started to pump water according to the first preset power, so that the water pump is started to circulate the water in the pipeline, and there is no need to start the gas water heater for heating. In this way, the freezing of the water in the pipeline can be avoided by starting the water pump to operate at a low power. Preferably, the first preset power is preferably set to 50% of the operating power of the water pump, but is not limited to the above setting, and can also be set to other more appropriate values ​​according to actual needs.

[0086] Step S105, detecting the return water volume of the gas water heater to obtain the actual circulation flow value.

[0087] In this embodiment, the controller activates the water inlet flow sensor to detect the water inlet volume or the return water volume of the water inlet pipe, thereby obtaining the actual circulation flow value, and then transmits the obtained data to the controller.

[0088] Step S106, comparing the actual circulation flow value with the first preset flow value, and adjusting the power of the water pump according to the comparison result.

[0089] Specifically, the step of comparing the actual circulation flow value with the first preset flow value and adjusting the power of the water pump according to the comparison result includes:

[0090] Determine whether the actual circulation flow value is less than the first preset flow value;

[0091] If yes, the power of the water pump is increased according to a third preset proportional value;

[0092] If not, the power of the water pump is reduced according to a third preset proportional value.

[0093] Step S107, until the actual circulation flow value reaches the first preset flow value, the current actual power value of the water pump is obtained.

[0094] In this embodiment, the third preset ratio is preferably set to 2%, but is not limited to the above setting, and other more suitable values ​​can be selected according to actual needs. Since the first preset power is preferably set to 50% of the running power of the water pump, after the water pump circulates the stored water in the pipeline for one circle, if the actual circulation flow value is less than the first preset flow value, the power of the water pump is increased according to the third preset ratio, that is, the water pump increases 2% on the basis of the current power to increase the power of the water pump, so the power of the water pump after the initial increase is 52%; if the actual circulation flow value is greater than or equal to the first preset flow value, the power of the water pump is reduced according to the third preset ratio, that is, the water pump reduces 2% on the basis of the current power to increase the power of the water pump, so the power of the water pump after the initial reduction is 48%, and so on, until the actual circulation flow value reaches the first preset flow value, then the current actual power value of the water pump is obtained. In addition, during the first operation, when the water pump power is increased to 100%, if the actual circulation flow value has not reached the first preset flow value, it is determined that the user's water pipe may be blocked or frozen when powered on. Therefore, after continuously running at 100% power for 1 minute, if the actual circulation flow value still cannot reach the first preset flow value, it is determined that the machine has a fault and the user is prompted.

[0095] Step S108, comparing the actual power value with the preset power condition, and deciding to obtain the current ambient temperature value of the gas water heater again according to the comparison result.

[0096] Specifically, the steps of comparing the actual power value with the preset power condition and determining to obtain the current ambient temperature value of the gas water heater again according to the comparison result include:

[0097] After obtaining the actual power value of the water pump;

[0098] Within the first preset time, collecting a plurality of actual power values ​​at intervals of a second preset time to obtain a first power data group;

[0099] Continuously collecting current power data, and correcting the first power data group collected last time according to the collected power data to obtain a second power data group, and calculating the sum of multiple actual power values ​​in the second power data group to obtain a first power sum value, and so on to obtain multiple power sum values ​​in sequence;

[0100] Until the first power sum value is respectively less than any one of the multiple power sum values, obtaining the current actual power value of the water pump again;

[0101] Determine whether the current actual power value meets the preset power condition, and the preset power condition is that the current actual power value is less than the sum of the average value of the first power sum and the first preset ratio value; if so, obtain the current ambient temperature value of the gas water heater again; if not, lower the preset start temperature value according to the second preset temperature adjustment value.

[0102] Furthermore, the steps after lowering the preset start temperature value according to the second preset temperature adjustment value include:

[0103] After lowering the preset start temperature value according to the second preset temperature adjustment value;

[0104] After a first preset time interval, the current ambient temperature value of the gas water heater is obtained again;

[0105] Determine whether the ambient temperature value is less than the lowered preset starting temperature value; if so, enter the initial antifreeze mode; if not, return to lower the preset starting temperature value again according to the second preset temperature adjustment value.

[0106] In this embodiment, the first preset time length is preferably set to 10s, but is not limited to the above setting. Other more appropriate time values ​​can also be selected according to actual needs. Therefore, when the actual circulation flow value reaches 2.5L / MIN and the running time is 10s, the total circulation flow rate is 2.5L / MIN*(10 / 60)=0.41L, which is about twice the water storage capacity of the machine water pipe.

[0107] Preferably, the step of comparing the actual power value with the preset power condition and determining to obtain the current ambient temperature value of the gas water heater again according to the comparison result further includes:

[0108] Determine whether the current actual power value meets the preset power condition, and the preset power condition is that the current actual power value is greater than or equal to the second preset ratio value;

[0109] If yes, then obtain the current ambient temperature value of the gas water heater again;

[0110] If not, the preset starting temperature value is lowered according to the second preset temperature adjustment value.

[0111] In this embodiment, within a duration of 10 s, when the first actual circulating flow rate value of 2.5 L / MIN is collected for the first time, the actual power value of the water pump is a[0]. The data obtained later are respectively denoted as a[1], a[2]…a[4], so as to obtain the first power data group. Then, sample the latest 5 groups of a[0]…a[5], and discard the oldest value in the previous power data group each time a sample is collected, so as to obtain the second power data group, that is, discard the a[0] value. Specifically: a[0]=a[1], a[1]=a[2], ……, a[4]=the current actual power value, and calculate the sum to obtain Sum[0]=a[0]+a[1]+a[1]+a[2]+a[3]+a[4]. By analogy, the following multiple power sums are obtained in turn: sum[1], sum[2], …sum[4]. When sum[0]<sum[1]<sum[2]…sum[4], it is determined that the actual circulating flow rate value continues to rise, and the current actual power value of the water pump is obtained by detecting the current latest power of the water pump again.

[0112] In this embodiment, the first preset ratio value is preferably set to 10%. More preferably, it is judged whether the current actual power value meets the preset power condition, and the preset power condition is that the current actual power value is less than the sum value between the average value of the first power sum and the first preset ratio value, and / or the current actual power value is greater than or equal to the second preset ratio value; if it is satisfied, it is considered that when the actual circulating flow rate value remains unchanged at this time, the power of the water pump continues to increase by 10%. At this time, some pipelines may start to freeze, and then the current ambient temperature value of the gas water heater is obtained again; if it is not satisfied, the preset start temperature value is reduced according to the second preset temperature adjustment value.

[0113] In this embodiment, the second preset temperature adjustment value is preferably 2℃, but it is not limited to the above setting, and other more appropriate temperature values can also be selected according to actual needs. And the first preset duration is preferably set to 10 min. More preferably, if the current actual power value does not meet the preset power condition, the preset start temperature value is reduced according to the second preset temperature adjustment value. Since the preset start temperature value is preset to 7℃, the preset start temperature value after the first reduction is 5℃. After an interval of 10 min, it is judged again whether the ambient temperature value is less than the preset start temperature value after reduction; if so, enter the initial anti-freezing mode; if not, return to reduce the preset start temperature value again according to the second preset temperature adjustment value, that is, the current preset start temperature value is lowered again according to the second preset temperature adjustment value to obtain the preset start temperature value after the second reduction. Since the current preset start temperature value is the preset start temperature value after the first reduction, the preset start temperature value after the second reduction is 3℃. And so on in a cycle until the ambient temperature value is less than the preset start temperature value to enter the initial anti-freezing mode, thus completing the adjustment work of the preset start temperature value.

[0114] Step S109, comparing the ambient temperature value with the preset secondary antifreeze condition, and deciding to enter the secondary antifreeze mode according to the comparison result.

[0115] Specifically, the step of comparing the ambient temperature value with the preset secondary antifreeze condition and deciding to enter the secondary antifreeze mode according to the comparison result includes:

[0116] Determine whether the ambient temperature value meets the preset secondary antifreeze condition, and the preset secondary antifreeze condition is that the current ambient temperature value is less than the preset temperature value and lasts for a second preset time;

[0117] If yes, it enters the secondary antifreeze mode;

[0118] If not, return to obtain the current ambient temperature value of the gas water heater again.

[0119] In this embodiment, if the current ambient temperature value is less than the preset temperature value and continues for the second preset time, that is, within the second preset time, the current ambient temperature value remains less than the preset temperature value, then the initial antifreeze mode is exited and the secondary antifreeze mode is entered. In this embodiment, the preset temperature value is preferably set to -5°C, but is not limited to the above setting, and other more suitable temperature values ​​can be selected according to actual needs. In addition, the second preset time is preferably set to 30 minutes, but is not limited to the above setting, and can be set to other more suitable time values ​​according to actual needs.

[0120] Step S110, after entering the secondary antifreeze mode, the water pump is started to pump water according to the second preset power, and the gas water heater performs heating according to the second preset flow value.

[0121] In this embodiment, after entering the secondary antifreeze mode, the water pump is started to pump water according to the second preset power, so that the water pump is started to circulate the water in the pipeline, and at the same time, the gas water heater is started to heat the return water, and then the heated hot water is circulated in the pipeline. In this way, by simultaneously starting the water pump and the water heater body to perform heating and circulation, the water in the pipeline can be prevented from freezing. After the cyclic heating, the pipeline is fully heated, and then it is in the initial antifreeze mode for a long time to start the water pump for low-power operation, and then the water heater body is not easy to enter the secondary antifreeze mode again. In addition, since the secondary antifreeze mode adopts the set temperature of the water heater body for heating, in this heating and antifreeze process, the normal water use of the user can be effectively prevented from cold water. More preferably, the first preset power is preferably set to 100% of the operating power of the water pump, but is not limited to the above setting, and can also be set to other more suitable values ​​according to actual needs, so as to ensure that the heating process ends as soon as possible and the heating temperature is equal to the temperature set by the user.

[0122] Step S111, the return water volume of the gas water heater is detected again to obtain the actual circulation flow value.

[0123] In this embodiment, the controller controls the water flow sensor to detect the return water volume or the water inlet volume at the water inlet pipe, so that the water flow sensor obtains the actual circulation flow value and feeds the obtained data back to the controller.

[0124] Step S112, comparing the actual circulation flow value with the preset flow condition, and determining the current inlet water temperature value based on the comparison result.

[0125] Specifically, the steps of comparing the actual circulation flow value with the preset flow condition and determining the current inlet water temperature value according to the comparison result include:

[0126] Determine whether the actual circulation flow value meets the preset flow condition, and the preset flow condition is that the actual circulation flow value is greater than the sum of the second preset flow value and the preset threshold value;

[0127] If yes, it is determined that there is water use at present, and the water pump is turned off to exit the secondary antifreeze mode, so that the gas water heater enters the normal heating mode;

[0128] If not, it is determined that there is no water usage action at present, and the current inlet water temperature value is obtained.

[0129] In this embodiment, the preset threshold is preferably set to 1, but is not limited to the above setting, and other more appropriate values ​​can be selected according to actual needs. In addition, the second preset flow value is preferably set to the upper limit circulation flow value of the water heater body, that is, the maximum circulation flow value.

[0130] In this embodiment, if the actual circulation flow value is greater than the sum of the second preset flow value and the preset threshold value, it is considered that the user may have started the water use action, and then turned it off to exit the secondary antifreeze mode. At the same time, the controller controls the water heater body to enter the normal heating mode, that is, normally supplying hot water to the water use point. When the user turns off the water heater body, that is, after the user finishes using the water, the water heater is in standby state and prepares to return to the initial antifreeze mode again. At the same time, the preset start temperature value is reset to 7°C, and all other data are cleared to zero; if the actual circulation flow value is less than or equal to the sum of the second preset flow value and the preset threshold value, it is determined that there is no water use action at present, and the controller controls the water inlet temperature sensor to detect the water inlet temperature to obtain the current water inlet temperature value, and then the water inlet temperature sensor transmits the acquired data to the controller.

[0131] Step S113, comparing the inlet water temperature value with the preset water temperature value, and deciding to return to the initial antifreeze mode according to the comparison result.

[0132] Specifically, by comparing the inlet water temperature value with the preset water temperature value, the step of determining to return to the initial antifreeze mode according to the comparison result includes:

[0133] Determine whether the inlet water temperature value is greater than the preset water temperature value;

[0134] If yes, stop heating;

[0135] If not, the system returns to the initial antifreeze mode, and the acquired data is cleared to restore the gas water heater to the standby state.

[0136] In this embodiment, the preset water temperature value is preferably set to 25°C, but is not limited to the above temperature value, and other temperature values ​​can be selected according to actual needs. Preferably, if the water inlet temperature value is greater than the preset water temperature value, the heating is stopped. Since the water heater body is inlet and outlet at this time, the antifreeze temperature will be greater than 25 degrees to return to the initial antifreeze mode again. At the same time, the preset start temperature value is reset to 7°C, and all other data are cleared.

[0137] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for controlling the antifreeze of a gas water heater. It is characterized in that The antifreeze control method comprises: The gas water heater is in standby mode; Obtaining the current ambient temperature value of the gas water heater; Comparing the ambient temperature value with a preset starting temperature value, and deciding to enter an initial antifreeze mode according to the comparison result; After entering the initial antifreeze mode, the water pump is started to pump water according to the first preset power; Detecting the return water volume of the gas water heater to obtain an actual circulation flow value; Comparing the actual circulation flow value with the first preset flow value, and adjusting the power of the water pump according to the comparison result; When the actual circulation flow value reaches the first preset flow value, obtaining the current actual power value of the water pump; Compare the actual power value with the preset power condition, and decide to obtain the current ambient temperature value of the gas water heater again according to the comparison result; Comparing the ambient temperature value with a preset secondary antifreeze condition, and deciding to enter a secondary antifreeze mode according to the comparison result; After entering the secondary antifreeze mode, the water pump is started to pump water according to the second preset power, and the gas water heater performs heating according to the second preset flow value; By comparing the inlet water temperature value with the preset water temperature value, the return to the initial antifreeze mode is determined based on the comparison result.

2. The antifreeze control method for a gas water heater according to claim 1, It is characterized in that The steps after the gas water heater performs heating according to the second preset flow value include: After the gas water heater performs heating work according to the second preset flow value; The return water volume of the gas water heater is detected again to obtain the actual circulation flow value; The actual circulation flow value is compared with the preset flow condition, and the current inlet water temperature value is obtained according to the comparison result.

3. The antifreeze control method for a gas water heater according to claim 2, It is characterized in that The step of comparing the actual circulation flow value with the preset flow condition and determining the current inlet water temperature value according to the comparison result comprises: Determine whether the actual circulation flow value meets the preset flow condition, and the preset flow condition is that the actual circulation flow value is greater than the sum of the second preset flow value and the preset threshold value; If yes, it is determined that there is water use action currently, and the water pump is turned off to exit the secondary antifreeze mode, so that the gas water heater enters the normal heating mode; If not, it is determined that there is no water usage action at present, and the current inlet water temperature value is obtained.

4. The antifreeze control method for a gas water heater according to claim 1, It is characterized in that The step of comparing the ambient temperature value with the preset starting temperature value and deciding to enter the initial antifreeze mode according to the comparison result comprises: Determining whether the ambient temperature value is less than a preset starting temperature value; If yes, it enters the initial antifreeze mode; If not, the preset starting temperature value is adjusted.

5. A method for controlling the antifreeze of a gas water heater according to claim 4, It is characterized in that The step of adjusting the preset starting temperature value comprises: Lowering the preset starting temperature value according to the first preset temperature adjustment value; After a first preset time interval, obtaining the current ambient temperature value of the gas water heater again; Determine whether the ambient temperature value is less than the lowered preset starting temperature value; if so, enter the initial antifreeze mode; if not, return to lower the preset starting temperature value again according to the first preset temperature adjustment value.

6. The antifreeze control method for a gas water heater according to claim 1, It is characterized in that The step of comparing the actual circulation flow value with the first preset flow value and adjusting the power of the water pump according to the comparison result comprises: Determining whether the actual circulation flow value is less than the first preset flow value; If yes, increasing the power of the water pump according to a third preset proportional value; If not, the power of the water pump is reduced according to a third preset proportional value.

7. The antifreeze control method for a gas water heater according to claim 1, It is characterized in that The step of comparing the actual power value with the preset power condition and determining to obtain the current ambient temperature value of the gas water heater again according to the comparison result comprises: After obtaining the current actual power value of the water pump; Within the first preset time, collecting a plurality of the actual power values ​​at intervals of a second preset time to obtain a first power data group; Continuously collecting current power data, and correcting the first power data group collected last time according to the collected power data to obtain a second power data group, and calculating the sum of multiple actual power values ​​in the second power data group to obtain a first power sum value, and so on to obtain multiple power sum values ​​in sequence; until the first power sum value is respectively less than any one of the multiple power sum values, obtaining the current actual power value of the water pump again; Determine whether the current actual power value meets the preset power condition, and the preset power condition is that the current actual power value is less than the sum of the average value of the first power sum and the first preset ratio value; if so, obtain the current ambient temperature value of the gas water heater again; if not, lower the preset start temperature value according to the second preset temperature adjustment value.

8. The antifreeze control method for a gas water heater according to claim 7, It is characterized in that The step of lowering the preset start temperature value according to the second preset temperature adjustment value comprises: After lowering the preset starting temperature value according to the second preset temperature adjustment value; After a first preset time interval, obtaining the current ambient temperature value of the gas water heater again; Determine whether the ambient temperature value is less than the lowered preset starting temperature value; if so, enter the initial antifreeze mode; if not, return to lower the preset starting temperature value again according to the second preset temperature adjustment value.

9. The antifreeze control method for a gas water heater according to claim 1, It is characterized in that The step of comparing the actual power value with the preset power condition and determining to obtain the current ambient temperature value of the gas water heater again according to the comparison result comprises: Determine whether the current actual power value satisfies the preset power condition, and the preset power condition is that the current actual power value is greater than or equal to a second preset ratio value; If yes, then obtaining the current ambient temperature value of the gas water heater again; If not, the preset starting temperature value is lowered according to the second preset temperature adjustment value.

10. The antifreeze control method for a gas water heater according to claim 1, It is characterized in that The step of comparing the ambient temperature value with the preset secondary antifreeze condition and deciding to enter the secondary antifreeze mode according to the comparison result comprises: Determining whether the ambient temperature value satisfies the preset secondary antifreeze condition, and the preset secondary antifreeze condition is that the current ambient temperature value is less than the preset temperature value and lasts for a second preset time period; If yes, it enters the secondary antifreeze mode; If not, return to obtain the current ambient temperature value of the gas water heater again.

11. The antifreeze control method for a gas water heater according to claim 1, It is characterized in that The step of comparing the inlet water temperature value with the preset water temperature value and determining to return to the initial antifreeze mode according to the comparison result comprises: Determining whether the water inlet temperature value is greater than the preset water temperature value; If yes, stop heating; If not, the initial antifreeze mode is returned, and the acquired data is cleared to restore the gas water heater to the standby state.

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