CN111503899B - Rapid heating temperature control method of gas heat exchange equipment - Google Patents

Abstract

The invention belongs to the technical field of gas heat exchange equipment, and discloses a rapid heating temperature control method of gas heat exchange equipment, which comprises the following stepsThe method comprises the following steps: setting a predetermined temperature T_{Setting up}(ii) a Actual water flow V for detecting gas heat exchange equipment_{Fruit of Chinese wolfberry}And the temperature T of the outlet water_{Go out}(ii) a If V_{Fruit of Chinese wolfberry}Threshold value V for water flow of startup procedure_{Opening device}If so, starting the gas heat exchange equipment for ignition and combustion, and recording the actual time t of the accumulated ignition and combustion_{Fruit of Chinese wolfberry}And according to T_TargetAnd T_{Go out}The difference between them controls the opening of the gas valve to change the fire power, T_Target＝T_{Setting up}+△T_Target(ii) a If t_{Fruit of Chinese wolfberry}< reset time threshold T, T_{Go out}≥T_TargetThen the gas heat exchange equipment is according to T_{Setting up}And T_{Go out}The difference value between the two control valves controls the opening of the gas valve to change the firepower to realize the output of constant-temperature hot water. The method solves the problem that a large amount of tap water is wasted due to low heating speed of the conventional gas heat exchange equipment.

Description

Rapid heating temperature control method of gas heat exchange equipment

Technical Field

The invention belongs to the technical field of gas heat exchange equipment, and particularly relates to a rapid heating temperature control method of gas heat exchange equipment.

Background

Gas indirect heating equipment, for example gas heater (like figure 1), gas dual-purpose stove, gas hanging stove etc. when the user opened hot tap for the first time, the running water flowed into the inside water route of steam indirect heating equipment body, set up rivers response module on inside water route this moment and monitored that there is the rivers to cross, then indirect heating equipment's gas valve is opened and is igniteed, heats the running water, realizes the heat transfer. The temperature control method in the process of heating tap water at present is generally that the temperature is controlled according to the preset temperature T set by a user after ignition_{Preset of}The water outlet temperature T of the water outlet end of the internal waterway_{Go out}The difference value between the water temperature and the water temperature controls the opening of the gas valve to adjust the firepower, so that the water temperature T is ensured_{Go out}Gradually reaches a preset temperature T_{Preset of}And realize the output of constant temperature hot water.

However, the time interval from the detection of water flow to ignition is typically at least 2 seconds, even more than 2 seconds; igniting to water outlet temperature T_{Go out}Reaches a preset temperature T_{Preset of}Still requiring at least about 20 seconds; in addition, a certain time is required for hot water to flow to a hot water faucet through a hot water pipe outside the gas heat exchange device (the specific time is required according to the length of the hot water pipe and the water flow rate). Therefore, the conventional gas heat exchange equipment firstly flows out a section of cold water after a hot water faucet is opened and then flows out hot water, the time from the hot water faucet opening to the comfortable hot water outflow usually exceeds 30 seconds, and a user needs to wait for the cold water to be completely discharged to use the hot water, so that a large amount of running water is wasted.

From the above description, the heating time of the present gas heat exchange device is controlled by the preset temperature T_{Preset of}The temperature of the tap water and the flow rate of the supplied water, and the like, and the preset temperature T is usually set_{Preset of}The higher the temperature of tap water is, the lower the temperature of tap water is, the larger the water supply flow is, the outlet water temperature T is_{Go out}Reaches a preset temperature T_{Preset of}The longer. Especially, in winter, the preheating temperature of gas heat exchange equipment, such as a gas water heater, is higher, the temperature of tap water is lower, the heating time of the gas water heater is longer, the time for a user to wait for hot water is longer, the user is easy to catch cold, and more tap water is wasted.

Disclosure of Invention

In view of this, the invention provides a method for controlling a rapid heating temperature of a gas heat exchanger, in order to solve the problem that a large amount of tap water is wasted due to a low heating speed of the existing gas heat exchanger.

The invention is realized by the following scheme:

a rapid heating temperature control method of gas heat exchange equipment comprises the following steps:

s1, opening the hot water faucet and setting the preset temperature T_{Setting up}；

S2, detecting actual water flow V of internal water channel of gas heat exchange equipment_{Fruit of Chinese wolfberry}And the temperature T of the outlet water_{Go out}；

If V_{Fruit of Chinese wolfberry}Threshold value V for water flow of startup procedure_{Opening device}If so, starting the gas heat exchange equipment for ignition and combustion, and recording the actual time t of the accumulated ignition and combustion_{Fruit of Chinese wolfberry}And according to the target heating temperature T_TargetAnd T_{Go out}The difference between the T and T controls the opening of the gas valve to change the fire power for heating_Target＝T_{Setting up}+△T_Target，△T_TargetAny temperature value within the temperature difference threshold range is heated by the program;

s3, if t_{Fruit of Chinese wolfberry}< reset time threshold T, T_{Go out}≥T_TargetThen the gas heat exchange equipment is according to T_{Setting up}And T_{Go out}The difference value controls the opening of the gas valve to change the firepower for heating so as to realize the output of constant-temperature hot water.

Preferably, the S3 specifically includes the following steps:

s31, when t is_{Fruit of Chinese wolfberry}If < reset time threshold T, judge T_{Go out}Whether or not T is satisfied_{Go out}≥T_Target(ii) a If yes, go to S32; if not, go to S33;

s32, the gas heat exchange equipment is according to T_{Setting up}And T_{Go out}The difference value controls the opening of the gas valve to change firepower for heating so as to realize constant-temperature hot water output;

s33, judging t_{Fruit of Chinese wolfberry}Whether the reset time threshold t is reached, if yes, performing S32; if not, S31 is performed.

Preferably, said Δ T_TargetAnd the preset temperature T_{Setting up}Has a direct proportional linear relationship.

Preferably, said Δ T_Target＝(△T_{Target max}-△T_{Target min})×(T_{Preset of}-T_{Preset min})/(T_{Preset max}-T_{Preset min})+△T_{Target min}Wherein Δ T_{Target max}And Δ T_{Target min}Respectively the maximum value and the minimum value of the threshold range of the temperature difference of the program heating; t is_{Preset max}And T_{Preset min}The maximum and minimum values of the temperature threshold range are preset for the program, respectively.

Preferably, said Δ T_TargetExchanging heat with said gasWater inlet temperature T of water inlet end of equipment internal waterway_{Inflow water}Has an inversely proportional linear relationship.

Preferably, when the gas heat exchange equipment judges T_{Inflow water}＞T_{Max of inflow}When said Δ T_Target＝△T_{Target min}；

When the gas heat exchange equipment judges T_{Inflow water}＜T_{Water inflow min}When said Δ T_Target＝△T_{Target max}；

When the gas heat exchange equipment judges T_{Water inflow min}≤T_{Inflow water}≤T_{Max of inflow}When said Δ T_Target＝(△T_{Target max}-△T_{Target min})×(T_{Max of inflow}-T_{Inflow water})/(T_{Max of inflow}-T_{Water inflow min})+△T_{Target min}；

Wherein, Delta T_{Target max}And Δ T_{Target min}Respectively the maximum value and the minimum value of the threshold range of the temperature difference of the program heating; t is_{Max of inflow}And T_{Water inflow min}The maximum value and the minimum value of the programmed inlet water temperature threshold range are respectively.

Preferably, said Δ T_TargetAnd the ambient temperature T of the external environment where the gas heat exchange equipment is positioned_{Environment(s)}Has an inversely proportional linear relationship.

Preferably, when the gas heat exchange equipment judges T_{Environment(s)}＞T_{Environment max}When said Δ T_Target＝△T_{Target min}；

When the gas heat exchange equipment judges T_{Environment(s)}＜T_{Environmental min}When said Δ T_Target＝△T_{Target max}；

When the gas heat exchange equipment judges T_{Environmental min}≤T_{Environment(s)}≤T_{Environment max}When said Δ T_Target＝(△T_{Target max}-△T_{Target min})×(T_{Environment max}-T_{Environment(s)})/(T_{Environment max}-T_{Environmental min})+△T_{Target min}；

Wherein, Delta T_{Target max}And Δ T_{Target min}Respectively a temperature difference threshold range of program heatingMaximum and minimum values of; t is_{Environment max}And T_{Environmental min}The maximum and minimum values of the programmed ambient temperature threshold range, respectively.

Preferably, the method further comprises:

s4, if the actual water flow V_{Fruit of Chinese wolfberry}< threshold value of water flow V for program shutdown_{Closing device}And if so, the gas heat exchange equipment is flamed out and switched back to the standby state.

Preferably, the gas heat exchange equipment is a gas water heater, a gas wall-mounted furnace or a gas dual-purpose furnace.

Compared with the prior art, the invention adopting the scheme has the beneficial effects that:

in the present invention, when V_{Fruit of Chinese wolfberry}Threshold value V for water flow of startup procedure_{Opening device}When the gas heat exchange equipment is started, igniting, namely, indicating that the gas heat exchange equipment is in a starting temperature-up stage; because at this stage, the gas heat exchange device of the invention is based on the target heating temperature T_TargetAnd T_{Go out}The difference between the opening degrees of the gas valves is used for controlling the opening degree of the gas valves so as to change the firepower for heating, and T_Target＝T_{Setting up}+△T_TargetThe target heating temperature T is explained_TargetHigher than T_{Setting up}That is to say the gas heat exchanger is higher than the preset temperature T in the temperature rising stage_{Setting up}Target heating temperature T of_TargetThe opening degree of a gas valve is adjusted, so that the firepower is increased to a greater extent in the temperature rising stage to improve the outlet water temperature T_{Go out}；

Subsequently, in order to avoid that the gas heat exchanger is always at the target heating temperature T_TargetTo adjust the opening of the gas valve to ensure the outlet water temperature T_{Go out}Too high a risk of scalding the user, so in the present invention, it is also required to be at t_{Fruit of Chinese wolfberry}< reset time threshold T, T_{Go out}≥T_TargetThen the gas heat exchange equipment is according to T_{Setting up}And T_{Go out}The difference value between the two temperature difference values controls the opening of the gas valve to change firepower for heating so as to realize constant-temperature hot water output, thus ensuring that the gas heat exchange equipment can realize the purpose of rapid temperature rise in the temperature rise stage, further compensating the heat loss of an external pipeline of the gas heat exchange equipment, and shortening the heatThe waiting time of water is shortened, and tap water is saved; but also can ensure the temperature T of the outlet water_{Go out}Is raised to the target heating temperature T_TargetThen does not rise continuously, but gradually returns to the preset temperature T_{Setting up}And then realize constant temperature hot water output, avoid appearing scalding the problem of user and appearing.

Drawings

FIG. 1 is a schematic structural diagram of a prior constant temperature gas water heater in a shower mode;

FIG. 2 is a flow chart of a rapid heating temperature control method for a gas heat exchanger according to an embodiment of the present invention;

FIG. 3 is another flow chart of a rapid heating temperature control method for a gas heat exchanger according to an embodiment of the present invention;

FIG. 4 is a relationship diagram of a startup program control temperature curve of the gas heat exchange device when the rapid heating temperature control method of the gas heat exchange device according to the embodiment of the present invention is used for temperature control;

fig. 5 is a graph showing a relationship between the water outlet temperature and the water outlet time at the water outlet end of the internal water path of the gas heat exchange device when the rapid heating temperature control method of the gas heat exchange device according to the embodiment of the present invention is used for temperature control:

the curve B in fig. 5 is a relationship diagram of the water outlet temperature and the water outlet time of the water outlet end of the internal waterway of the gas heat exchange device when the temperature control is performed by using the existing temperature control method:

fig. 6 is a graph showing a relationship between the water outlet temperature and the water outlet time of the water outlet point (for example, a hot water tap) of the gas heat exchanger when the rapid heating temperature control method of the gas heat exchanger according to the embodiment of the present invention is used for temperature control:

the curve B in fig. 6 is a relationship diagram of the water outlet temperature and the water outlet time of the water outlet point of the gas heat exchange device when the temperature control is performed by using the existing temperature control method:

FIG. 7 shows a target programmed heating temperature difference threshold Δ T of a rapid heating temperature control method for a gas heat exchanger according to an embodiment of the present invention_TargetAnd a predetermined temperature T_{Setting up}A relationship diagram of (1);

FIG. 8 is a programmed heating temperature difference threshold Δ T of the rapid heating temperature control method for gas heat exchange equipment according to an embodiment of the present invention_TargetAnd the temperature T of the inlet water_IntoA relationship diagram of (1);

FIG. 9 shows a programmed heating temperature difference threshold Δ T of a rapid heating temperature control method for a gas heat exchanger according to an embodiment of the present invention_TargetAnd ambient temperature T_{Environment(s)}A relationship diagram of (1);

FIG. 10 is a schematic structural diagram of a gas water heater employing the temperature control method of the present embodiment;

FIG. 11 is a schematic structural view of another gas water heater employing the temperature control method of the present embodiment;

in the figure: 1. a water heater body; 11. an internal waterway; 2. a water flow sensing module; 3. an effluent temperature detection module; 4. a gas valve; 5. an operation display; 51. a temperature setting key; 6. a controller; 7. a water inlet temperature detection module; 8. an ambient temperature detection module for detecting the ambient temperature,

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment provides a rapid heating temperature control method for gas heat exchange equipment, as shown in fig. 2, the method includes:

s1, opening the hot water faucet and setting the preset temperature T_{Setting up}；

S2, detecting actual water flow V of internal water channel of gas heat exchange equipment_{Fruit of Chinese wolfberry}And the temperature T of the outlet water_{Go out}；

If V_{Fruit of Chinese wolfberry}Threshold value V for water flow of startup procedure_{Opening device}If so, starting the gas heat exchange equipment for ignition and combustion, and recording the actual time t of the accumulated ignition and combustion_{Fruit of Chinese wolfberry}And according to the target heating temperature T_TargetAnd T_{Go out}The difference between the T and T controls the opening of the gas valve to change the fire power for heating_Target＝T_{Setting up}+△T_Target，△T_TargetAny temperature value within the temperature difference threshold range is heated by the program;

s3, if t_{Fruit of Chinese wolfberry}< reset time threshold T, T_{Go out}≥T_TargetThen the gas heat exchange equipment is according to T_{Setting up}And T_{Go out}The difference value controls the opening of the gas valve to change the firepower for heating so as to realize the output of constant-temperature hot water.

In this embodiment, when V_{Fruit of Chinese wolfberry}Threshold value V for water flow of startup procedure_{Opening device}When the gas heat exchange device is started, ignition is performed, that is, it is described that the gas heat exchange device is in a starting temperature rise stage, and the starting temperature control condition of the gas heat exchange device of the embodiment is shown in fig. 4; because at this stage, the gas heat exchanger of the present embodiment is based on the target heating temperature T_TargetAnd T_{Go out}The difference between the opening degrees of the gas valves is used for controlling the opening degree of the gas valves so as to change the firepower for heating, and T_Target＝T_{Setting up}+△T_TargetThe target heating temperature T is explained_TargetHigher than T_{Setting up}That is to say the gas heat exchanger is higher than the preset temperature T in the temperature rising stage_{Setting up}Target heating temperature T of_TargetThe opening degree of a gas valve is adjusted, so that the firepower is increased to a greater extent in the temperature rising stage to improve the outlet water temperature T_{Go out}；

Subsequently, in order to avoid that the gas heat exchanger is always at the target heating temperature T_TargetTo adjust the opening of the gas valve to ensure the outlet water temperature T_{Go out}Too high a risk of scalding the user, so in this embodiment, it is also required to be at t_{Fruit of Chinese wolfberry}< reset time threshold T, T_{Go out}≥T_TargetThen the gas heat exchange equipment is according to T_{Setting up}And T_{Go out}The difference value between the two temperature values controls the opening of the gas valve to change firepower for heating so as to realize constant-temperature hot water output, thus ensuring that the gas heat exchange equipment can realize the purpose of rapid temperature rise in the temperature rise stage, further compensating the heat loss of an external pipeline of the gas heat exchange equipment, shortening the waiting time of hot water and saving tap water; but also can ensure the temperature T of the outlet water_{Go out}Is raised to the target heating temperature T_TargetThen does not rise continuously, but gradually returns to the preset temperature T_{Setting up}And then realize constant temperature hot water output, avoid appearing scalding the problem of user and appearing.

As can also be seen from fig. 5, compared with the conventional temperature control method of the gas heat exchange device, the temperature control method is that the preset temperature T is set by the user after ignition_{Preset of}The water outlet temperature T of the water outlet end of the internal waterway_{Go out}The difference value between the water temperature and the water temperature controls the opening of the gas valve to adjust the firepower, so that the water temperature T is ensured_{Go out}Gradually reaches a preset temperature T_{Preset of}The temperature control method can ensure that the water outlet temperature T of the water outlet end of the water channel in the gas heat exchange equipment can be ensured in a short time_{Go out}Reaches a preset temperature T_{Preset of}The time for the user to wait for hot water is reduced, and tap water is saved.

As for the relation of the water outlet temperature of the water consumption point with time, as shown in fig. 6, as can be seen from fig. 6, the water outlet point has a distance from the water outlet end of the internal water channel of the gas heat exchange device, the distance is determined by the length of the external pipeline, and as the hot water flows from the water outlet end of the internal water channel of the gas heat exchange device to the water outlet end of the water consumption point, heat loss is generated, so when the water outlet temperature T of the water outlet end is higher than the water outlet temperature T of the water consumption point_{Go out}Reaches a preset temperature T_{Preset of}But the temperature of the outlet water at the outlet point is lower than the preset temperature T due to heat loss_{Preset of}The user's request cannot be met, and a long hot water waiting time is required to meet the user's request.

The temperature of the water outlet end obtained by the temperature control method of the embodiment reaches the target heating temperature T_TargetI.e. above the predetermined temperature T_{Preset of}When the water flows to the water outlet point, the water outlet temperature of the water outlet point is closer to the preset temperature T_{Preset of}Even directly equal to or higher than the preset temperature T_{Preset of}Thus, the hot water waiting time of the user is shortened. That is, compared with the conventional temperature control method of the gas heat exchange device, the temperature control method of the embodiment can make the temperature of the outlet water reach the preset temperature T in a shorter time_{Preset of}To ensure the comfort of the user and reduceThe time for the user to wait for hot water saves tap water.

Program startup water flow threshold V in this embodiment_{Opening device}And Δ T_TargetAre all numerical values preset in advance in the program, such as program starting water flow threshold value V_{Opening device}Usually determined empirically, and Δ T_TargetThe temperature difference threshold range of the heating temperature difference of the program is 3-10 ℃, then delta T_TargetAny temperature value within the range of 3-10 ℃ can be preset according to season change. For example at winter time Δ T_TargetCan be preset at an elevated temperature, for example 8 ℃; and in summer Δ T_TargetIt may be preset at a low temperature, for example 4 ℃.

Further, as shown in fig. 3, S3 of this embodiment may further include the following steps:

s31, when t is_{Fruit of Chinese wolfberry}If < reset time threshold T, judge T_{Go out}Whether or not T is satisfied_{Go out}≥T_Target(ii) a If yes, go to S32; if not, go to S33;

s32, the gas heat exchange equipment is according to T_{Setting up}And T_{Go out}The difference value controls the opening of the gas valve to change firepower for heating so as to realize constant-temperature hot water output;

s33, judging t_{Fruit of Chinese wolfberry}Whether the reset time threshold t is reached, if yes, performing S32; if not, S31 is performed.

The reset time threshold T in this embodiment is a time value preset in a program in advance, and may be a fixed value or may be set by a parameter setting mode of a controller of the gas heat exchange device, so as to prevent the gas heat exchange device from always heating at the target heating temperature T_TargetTo adjust the opening of the gas valve to ensure the outlet water temperature T_{Go out}Too high a risk of scalding the user occurs. Preferably, the reset time threshold t in this embodiment may have a value range of 10s to 20 s.

In the actual use process, the reset time threshold t can be set to be proper according to the pipeline length, the tap water flow, the tap water temperature or the environment temperature of the application scene of the gas heat exchange equipment and other factors.

For example if the pipe is long, the tap water temperature is low or the ambient temperature is low, etc., a long reset time threshold t, for example 18s, needs to be set.

Further, as shown in FIG. 7, Δ T and the predetermined temperature T_{Setting up}Has a direct proportional linear relationship. Preset temperature T_{Setting up}The higher the target heating temperature T_TargetThe water temperature is increased along with the increase of the water temperature, so that the water temperature is suitable for different bath water temperatures all the year round. In summer, the ambient temperature is high, the heat dissipation of the water pipe is slow, the bath temperature preset by the user is low, and the small target heating temperature T can be matched_Target(ii) a In winter, the ambient temperature is low, the heat dissipation of the water pipe is quick, the bath temperature preset by a user is high, and the bath temperature can be matched with a large target heating temperature T_Target。

A preferable determination method as this embodiment is:

programmed preset temperature threshold minimum value T_{Preset min}(generally 35 ℃) corresponding to the minimum value Delta T of the programmed heating temperature difference threshold_{Target min}(typically 3 ℃); programmed preset temperature threshold maximum value T_{Preset max}(generally 60 ℃) corresponding to the maximum value delta T of the programmed heating temperature difference threshold_{Target max}(typically 10 ℃); and the minimum value T of the programmed preset temperature threshold of the embodiment_{Preset min}Program preset temperature threshold maximum value T_{Preset max}Minimum value delta T of temperature difference threshold of program heating_{Target min}Maximum delta T of programmed heating temperature difference threshold_{Target max}All are fixed values or can be set by the parameter setting mode of the controller. Programmed heating temperature difference threshold value delta T of the embodiment_TargetDetermined by the following formula:

△T_target＝(△T_{Target max}-△T_{Target min})×(T_{Preset of}-T_{Preset min})/(T_{Preset max}-T_{Preset min})+△T_{Target min}Wherein Δ T_{Target max}And Δ T_{Target min}Respectively the maximum value and the minimum value of the threshold range of the temperature difference of the program heating; t is_{Preset max}And T_{Preset min}The maximum and minimum values of the temperature threshold range are preset for the program, respectively.

Further, as shown in FIG. 8, the programmed heating temperature difference threshold Δ T_TargetWater inlet temperature T of water inlet end of water channel in gas heat exchange equipment_IntoHas an inversely proportional linear relationship. Temperature T of inlet water_{Inflow water}The higher the temperature difference threshold Delta T of programmed heating_TargetThe water inlet temperature is reduced along with the water inlet temperature, so that the water inlet temperature is suitable for different seasons. In summer, the temperature of tap water and the temperature of water stored in a hot water pipeline are higher, and a smaller program heating temperature difference threshold value delta T can be matched_Target(ii) a In winter, the temperature of tap water and the temperature of water stored in a hot water pipeline are lower, and a larger program heating temperature difference threshold value delta T can be matched_Target；

A preferable determination method as this embodiment is:

minimum value T of programmed inlet water temperature threshold range_{Water inflow min}Maximum value delta T of corresponding program heating temperature difference threshold range_{Target max}Maximum value T of programmed inlet water temperature threshold range_{Max of inflow}Minimum value delta T of corresponding program heating temperature difference threshold range_{Target min}(ii) a Minimum value T of programmed inlet water temperature threshold range_{Water inflow min}Maximum value T of programmed inlet water temperature threshold range_{Max of inflow}Maximum value delta T of threshold range of temperature difference of programmed heating_{Target max}And minimum value delta T of threshold range of programmed heating temperature difference_{Target min}All are fixed values or can be set by the parameter setting mode of the controller. Minimum value T of programmed inlet water temperature threshold range_{Water inflow min}Can be 10 ℃ and the maximum value T of the programmed water inlet temperature threshold range_{Max of inflow}May be 35 deg.c. Programmed heating temperature difference threshold value delta T of the embodiment_TargetCan be determined as follows:

detect temperature T of intaking of gas indirect heating equipment inside water route end of intaking_Into；

When the gas heat exchange equipment judges T_{Inflow water}＞T_{Max of inflow}Time, delta T_Target＝△T_{Target min}；

When the gas heat exchange equipment judges T_{Inflow water}＜T_{Water inflow min}Time, delta T_Target＝△T_{Target max}；

When the gas heat exchange equipment judges T_{Water inflow min}≤T_{Inflow water}≤T_{Max of inflow}When said Δ T_Target＝(△T_{Target max}-△T_{Target min})×(T_{Max of inflow}-T_{Inflow water})/(T_{Max of inflow}-T_{Water inflow min})+△T_{Target min}；

Wherein, Delta T_{Target max}And Δ T_{Target min}Respectively the maximum value and the minimum value of the threshold range of the temperature difference of the program heating; t is_{Max of inflow}And T_{Water inflow min}The maximum value and the minimum value of the programmed inlet water temperature threshold range are respectively.

Further, as shown in FIG. 9, the programmed heating temperature difference threshold Δ T_TargetThe ambient temperature T of the external environment where the gas heat exchange equipment is located_{Environment(s)}Has an inversely proportional linear relationship. Ambient temperature T_{Environment(s)}The higher the temperature difference threshold Delta T of programmed heating_TargetThe follow-up is small, and the temperature-adjustable solar water heater is suitable for different environmental temperatures all the year round. In summer, the environment temperature is high, the heat dissipation of the water pipe is slow, and the smaller program heating temperature difference threshold value Delta T can be matched_Target(ii) a In winter, the environment temperature is low, the heat dissipation of the water pipe is fast, and the temperature difference threshold delta T of large program heating can be matched_Target；

A preferable determination method as this embodiment is:

minimum value T of programmed ambient temperature threshold range_{Environmental min}Maximum value delta T of corresponding program heating temperature difference threshold range_{Target max}(ii) a Maximum value T of programmed environment temperature threshold range_{Environment max}Minimum value delta T of corresponding program heating temperature difference threshold range_{Target min}(ii) a Minimum value T of programmed ambient temperature threshold range_{Environmental min}Maximum value T of threshold range of program environment temperature_{Environment max}Maximum value delta T of threshold range of temperature difference of programmed heating_{Target max}And minimum value delta T of threshold range of programmed heating temperature difference_{Target min}All are fixed values or can be set by the parameter setting mode of the controller of the gas heat exchange equipment. Minimum value T of programmed ambient temperature threshold range_{Environmental min}Can be 5 ℃ and the programmed environment temperatureMaximum value T of threshold range_{Environment max}The temperature difference threshold value delta T can be 30 ℃ in the programmed heating of the embodiment_TargetCan be determined as follows:

when the gas heat exchange equipment judges T_{Environment(s)}＞T_{Environment max}Time, delta T_Target＝△T_{Target min}；

When the gas heat exchange equipment judges T_{Environment(s)}＜T_{Environmental min}Time, delta T_Target＝△T_{Target max}；

When the gas heat exchange equipment judges T_{Environmental min}≤T_{Environment(s)}≤T_{Environment max}Time, delta T_Target＝(△T_{Target max}-△T_{Target min})×(T_{Environment max}-T_{Environment(s)})/(T_{Environment max}-T_{Environmental min})+△T_{Target min}；

Wherein, Delta T_{Target max}And Δ T_{Target min}Respectively the maximum value and the minimum value of the threshold range of the temperature difference of the program heating; t is_{Environment max}And T_{Environmental min}The maximum and minimum values of the programmed ambient temperature threshold range, respectively.

Further, as shown in fig. 3, the method for controlling the rapid heating temperature of the gas heat exchanger of this embodiment further includes the following steps:

if the actual water flow V_{Fruit of Chinese wolfberry}< threshold value of water flow V for program shutdown_{Closing device}And if so, the gas heat exchange equipment is flamed out and is switched back to the standby state.

Real-time actual water flow V judgment of gas heat exchange equipment_{Fruit of Chinese wolfberry}Whether or not: actual water flow V_{Fruit of Chinese wolfberry}< threshold value of water flow V for program shutdown_{Closing device}(ii) a If yes, the gas heat exchange equipment is flameout and shut down, t_{Fruit of Chinese wolfberry}Clearing and returning to a standby state; if not, returning to S32, namely the gas heat exchange equipment continues to be according to T_{Setting up}And T_{Go out}The difference value controls the opening of the gas valve to change firepower for heating so as to realize constant-temperature hot water output; thus ensuring that the temperature of the water outlet point is always the preset temperature when the user uses water; when the water consumption point does not use water, the gas-fired boiler is shut down in time, so that the waste of gas is avoided.

In this embodiment, the program shutdown water flow threshold V_{Closing device}May be 2.0L/min.

Further, the gas heat exchange equipment is a gas water heater, a gas wall-mounted furnace or a gas dual-purpose furnace.

In addition, there is also provided a gas water heater using the temperature control method of the present embodiment, as shown in fig. 1, the gas water heater includes:

a water heater body 1 including an internal waterway 11;

the water flow sensing module 2 is arranged on the internal water path 11 and used for monitoring the actual water flow V flowing through the internal water path in real time_{Fruit of Chinese wolfberry}；

A water outlet temperature detection module 3, which is arranged at the water outlet end of the internal water path 11 and is used for monitoring the water outlet temperature T at the water outlet end of the internal water path 11_{Go out}；

The gas valve 4 is arranged on a gas supply passage in the water heater body 1 and is used for controlling the on-off of gas and the flow of the gas;

an operation display 5 including a temperature setting key 51 for setting a preset temperature T_{Setting up}；

And the controller 6 is electrically connected with the operation display 5, the gas valve 4, the water outlet temperature detection module 3 and the water flow induction module 2.

As shown in fig. 3 and fig. 1, the rapid heating temperature control method of the present embodiment is further described below with reference to the gas water heater:

s1, when the user opens the hot water tap at the water using point, the preset temperature T is set by operating the temperature setting key 51 on the display 5_{Setting up}And a predetermined temperature T_{Setting up}Displayed on the operation display 5;

s2, the water flow sensing module 2 monitors the actual water flow V flowing through the water channel 11 in the water heater body 1 in real time_{Fruit of Chinese wolfberry}The outlet water temperature detection module 3 monitors the outlet water temperature T flowing through the outlet end of the internal water path 11 in real time_{Go out}(ii) a And the water flow sensing module 2 senses the actual water flow V_{Fruit of Chinese wolfberry}The outlet water temperature detection module 3 detects the outlet water temperature T_{Go out}Feeding back to the controller 6;

the controller 6 receives the actual waterFlow rate V_{Fruit of Chinese wolfberry}And the temperature T of the outlet water_{Go out}Then, judge V_{Fruit of Chinese wolfberry}Whether or not to satisfy V_{Fruit of Chinese wolfberry}Threshold value V for water flow of startup procedure_{Opening device}；

If not, the gas water heater keeps a standby state;

if yes, starting the gas water heater to ignite and burn; at the same time, the controller 6 controls the timer to record the actual time t of the cumulative ignition combustion_{Fruit of Chinese wolfberry}And according to the target heating temperature T_TargetAnd T_{Go out}The difference between the opening degrees of the gas valve 4 is controlled to change the heating power for heating, wherein T_Target＝T_{Setting up}+△T_Target，△T_TargetAny temperature value within the temperature difference threshold range is heated by the program;

s31, the controller 6 receives the accumulated actual time t of ignition combustion fed back by the timer_{Fruit of Chinese wolfberry}Then, it is determined at t_{Fruit of Chinese wolfberry}< reset time threshold T, T_{Go out}Whether or not T is satisfied_{Go out}≥T_Target(ii) a If yes, go to S32; if not, go to S33;

s32, gas water heater according to T_{Setting up}And T_{Go out}The difference value between the two control the opening degree of the gas valve 4 to change the firepower for heating so as to realize the output of constant temperature hot water;

s33, judgment t_{Fruit of Chinese wolfberry}Whether the reset time threshold t is reached, if yes, performing S32; if not, go to S31;

meanwhile, the controller 6 also judges the actual water flow V_{Fruit of Chinese wolfberry}Whether or not: actual water flow V_{Fruit of Chinese wolfberry}< threshold value of water flow V for program shutdown_{Closing device}If yes, the gas heat exchange equipment is extinguished and shut down, t_{Fruit of Chinese wolfberry}Clearing and returning to a standby state; if not, returning to S32, namely the gas heat exchange equipment continues to be according to T_{Setting up}And T_{Go out}The difference value controls the opening of the gas valve to change the firepower for heating so as to realize the output of constant-temperature hot water. Thus ensuring that the temperature of the water outlet point is always the preset temperature when the user uses water; when the water consumption point does not use water, the gas-fired boiler is shut down in time, so that the waste of gas is avoided.

In this embodiment, the program shutdown water flow threshold V_{Closing device}May be 2.0L/min.

The water flow induction module of the gas water heater of the embodiment can be a flow detector; the outlet water temperature detection module can be a temperature sensor.

Further, as shown in fig. 10, the gas water heater of the present embodiment further includes an inlet water temperature detection module 7 disposed at the inlet end of the internal water path 11 for monitoring the inlet temperature T in real time_{Inflow water}. The inlet water temperature detection module may be a temperature sensor.

The temperature control method combined with the present embodiment is that the inlet water temperature detection module 7 monitors the inlet temperature T in real time_{Inflow water}And will monitor the entering temperature T_{Inflow water}Feeding back to the controller 6;

the controller 6 judges the entering temperature T_{Inflow water}Maximum value T of programmed inlet water temperature threshold range_{Max of inflow}And the minimum value T of the programmed inlet water temperature threshold range_{Water inflow min}The following relationship is adopted as the size of the gap between the two electrodes_TargetAnd (4) assignment:

when T is_{Inflow water}＞T_{Max of inflow}When said Δ T_Target＝△T_{Target min}；

When T is_{Inflow water}＜T_{Water inflow min}When said Δ T_Target＝△T_{Target max}；

When T is_{Water inflow min}≤T_{Inflow water}≤T_{Max of inflow}When said Δ T_Target＝(△T_{Target max}-△T_{Target min})×(T_{Max of inflow}-T_{Inflow water})/(T_{Max of inflow}-T_{Water inflow min})+△T_{Target min}。

Further, as shown in fig. 11, the gas water heater further includes an ambient temperature detection module 8 disposed outside the casing of the water heater body 1 for detecting the external ambient temperature T of the gas water heater in real time_{Environment(s)}. The ambient temperature detection module may be a temperature sensor.

The temperature control method according to the embodiment is that the ambient temperature detection module 8 monitors the ambient temperature T in real time_{Environment(s)}And will monitor the ambient temperature T_{Environment(s)}FeedbackTo the controller 6;

the controller 6 judges the ambient temperature T_{Environment(s)}Maximum value T of threshold range of program environment temperature_{Environment max}And a minimum value T of the programmed ambient temperature threshold range_{Environmental min}The following relationship is adopted as the size of the gap between the two electrodes_TargetAnd (4) assignment:

when T is_{Environment(s)}＞T_{Environment max}When said Δ T_Target＝△T_{Target min}；

When T is_{Environment(s)}＜T_{Environmental min}When said Δ T_Target＝△T_{Target max}；

When T is_{Environmental min}≤T_{Environment(s)}≤T_{Environment max}When said Δ T_Target＝(△T_{Target max}-△T_{Target min})×(T_{Environment max}-T_{Environment(s)})/(T_{Environment max}-T_{Environmental min})+△T_{Target min}。

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A rapid heating temperature control method of gas heat exchange equipment is characterized by comprising the following steps:

s1, opening the hot water faucet and setting the preset temperature T_{Preset of}；

S2, detecting actual water flow V of internal water channel of gas heat exchange equipment_{Fruit of Chinese wolfberry}And the temperature T of the outlet water_{Go out}；

If V_{Fruit of Chinese wolfberry}Threshold value V for water flow of startup procedure_{Opening device}If so, starting the gas heat exchange equipment for ignition and combustion, and recording the actual time t of the accumulated ignition and combustion_{Fruit of Chinese wolfberry}And according to the target heating temperature T_TargetAnd T_{Go out}The difference between them controls the opening of the gas valveHeating with varying power, wherein T_Target=T_{Preset of}+△T_Target，△T_TargetFor programmed heating of any temperature value within a threshold range of temperature differences, said Δ T_TargetAnd the preset temperature T_{Preset of}Has a direct proportional linear relationship, specifically: the Delta T_Target=(△T_{Target max}-△T_{Target min})×（T_{Preset of}-T_{Preset min}）/（T_{Preset max}-T_{Preset min}）+△T_{Target min}Wherein Δ T_{Target max}And Δ T_{Target min}Respectively the maximum value and the minimum value of the threshold range of the temperature difference of the program heating; t is_{Preset max}And T_{Preset min}Respectively presetting the maximum value and the minimum value of a temperature threshold range for a program;

s31, when t is_{Fruit of Chinese wolfberry}If < reset time threshold T, judge T_{Go out}Whether or not T is satisfied_{Go out}≥T_Target(ii) a If yes, go to S32; if not, go to S33;

s32, the gas heat exchange equipment is according to T_{Preset of}And T_{Go out}The difference value controls the opening of the gas valve to change firepower for heating so as to realize constant-temperature hot water output;

s33, judging t_{Fruit of Chinese wolfberry}Whether the reset time threshold t is reached, if yes, performing S32; if not, S31 is performed.

2. The rapid heating temperature control method of a gas heat exchanger as claimed in claim 1, wherein said Δ T is_TargetAnd the water inlet temperature T of the water inlet end of the internal water channel of the gas heat exchange equipment_{Inflow water}Has an inversely proportional linear relationship.

3. The rapid heating temperature control method of a gas heat exchange device according to claim 2,

when the gas heat exchange equipment judges T_{Inflow water}＞T_{Max of inflow}When said Δ T_Target=△T_{Target min}；

When the gas heat exchange equipment judges T_{Inflow water}＜T_{Water inflow min}When said Δ T_Target=△T_{Target max}；

When the gas heat exchange equipment judges T_{Water inflow min}≤T_{Inflow water}≤T_{Max of inflow}When said Δ T_Target=(△T_{Target max}-△T_{Target min})×（T_{Max of inflow}-T_{Inflow water}）/（T_{Max of inflow}-T_{Water inflow min}）+△T_{Target min}；

Wherein, Delta T_{Target max}And Δ T_{Target min}Respectively the maximum value and the minimum value of the threshold range of the temperature difference of the program heating; t is_{Max of inflow}And T_{Water inflow min}The maximum value and the minimum value of the programmed inlet water temperature threshold range are respectively.

4. The rapid heating temperature control method of a gas heat exchanger as claimed in claim 1, wherein said Δ T is_TargetAnd the ambient temperature T of the external environment where the gas heat exchange equipment is positioned_{Environment(s)}Has an inversely proportional linear relationship.

5. The rapid heating temperature control method of a gas heat exchange device according to claim 4,

when the gas heat exchange equipment judges T_{Environment(s)}＞T_{Environment max}When said Δ T_Target=△T_{Target min}；

When the gas heat exchange equipment judges T_{Environment(s)}＜T_{Environmental min}When said Δ T_Target=△T_{Target max}；

When the gas heat exchange equipment judges T_{Environmental min}≤T_{Environment(s)}≤T_{Environment max}When said Δ T_Target=(△T_{Target max}-△T_{Target min})×（T_{Environment max}-T_{Environment(s)}）/（T_{Environment max}-T_{Environmental min}）+△T_{Target min}；

Wherein, Delta T_{Target max}And Δ T_{Target min}Respectively the maximum value and the minimum value of the threshold range of the temperature difference of the program heating; t is_{Environment max}And T_{Environmental min}The maximum and minimum values of the programmed ambient temperature threshold range, respectively.

6. The rapid heating temperature control method of the gas heat exchange device according to any one of claims 1 to 5, characterized in that the method further comprises:

s4, if the actual water flow V_{Fruit of Chinese wolfberry}< threshold value of water flow V for program shutdown_{Closing device}And if so, the gas heat exchange equipment is flamed out and switched back to the standby state.

7. The rapid heating temperature control method of the gas heat exchange device according to any one of claims 1 to 5, wherein the gas heat exchange device is a gas water heater, a gas wall-mounted furnace or a gas dual-purpose furnace.

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