CN105020879B - Fire electric water heating system and its control method - Google Patents

Abstract

The invention discloses a kind of combustion electric water heating system and there is its control method, the combustion electric water heating system includes：Gas heater；Thermostat includes electric heater component and thermostatic assembly, and the water inlet of electric heater component and the delivery port of gas heater connect, and the delivery port of electric heater component and the first water inlet of thermostatic assembly connect, and the second water inlet of thermostatic assembly is connected to feed pipe；First detection module；Control module, control module obtain gas heater delivery port to electric heater component water inlet water-holding quantity, and the setting temperature of electric heater component is calculated according to the water inlet ratio of the first water inlet and the second water inlet of the water temperature in water-holding quantity, feed pipe and thermostatic assembly, to be controlled according to setting temperature to electric heater component.The combustion electric water heating system can calculate the setting temperature of electric heater component automatically, so as to balance pipeline cold water, while ensure that user can light a fire startup using gas heater during hot water.

Description

Fire-fired hot water system and its control method

technical field

The invention relates to the technical field of hot water systems, in particular to an electric hot water system and a control method for the electric hot water system.

Background technique

With the continuous improvement of users' requirements for hot water, a single water heater can no longer meet the requirements of users, especially some users who have high requirements for bathing comfort. Different water temperatures, multiple points of bathing at the same time, etc.

Based on the continuous improvement of users' requirements for bathing comfort, users' requirements for water heaters are also getting higher and higher. Therefore, it is necessary to improve the water heaters.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to propose a gas-fired hot water system that can automatically calculate the set temperature of the electric water heater components, thereby balancing the cold water in the pipeline, and at the same time ensuring that the gas water heater can be ignited and started when the user uses hot water.

Another object of the present invention is to provide a control method for a fuel-fired hot water system.

In order to achieve the above purpose, an embodiment of the present invention proposes a fuel-fired hot water system, including: a gas water heater, the water inlet of the gas water heater is connected to the water supply pipe; a constant temperature device, the constant temperature device includes an electric water heater assembly and a constant temperature assembly, the water inlet of the electric water heater assembly is connected to the water outlet of the gas water heater, the water outlet of the electric water heater assembly is connected to the first water inlet of the thermostat assembly, and the second water inlet of the thermostat assembly is connected to To the water supply pipe, the water outlet of the thermostatic assembly is connected to the first water end; the first detection module, the first detection module is used to detect the water temperature in the water supply pipe; the control module, the control module is used to obtain The amount of water stored from the water outlet of the gas water heater to the water inlet of the electric water heater assembly, and according to the water storage, the water temperature in the water supply pipe, and the first water inlet and the second water inlet of the thermostat assembly The water ratio calculates the set temperature of the electric water heater assembly, so as to control the electric water heater assembly according to the set temperature of the electric water heater assembly.

According to the gas-fired hot water system of the embodiment of the present invention, the water inlet of the gas water heater is connected to the water supply pipe, the constant temperature device includes an electric water heater assembly and a constant temperature assembly, the water inlet of the electric water heater assembly is connected to the water outlet of the gas water heater, and the outlet of the electric water heater assembly The water port is connected to the first water inlet of the constant temperature component, the second water inlet of the constant temperature component is connected to the water supply pipe, the water outlet of the constant temperature component is connected to the first water end, the first detection module detects the water temperature in the water supply pipe, and the control module obtains the temperature of the gas water heater. The water storage volume from the water outlet to the water inlet of the electric water heater assembly, and calculate the setting temperature of the electric water heater assembly according to the water storage volume, the water temperature in the water supply pipe, and the water inlet ratio of the first water inlet and the second water inlet of the thermostat assembly, so as to The set temperature of the water heater assembly controls the electric water heater assembly. Therefore, the gas-fired hot water system in the embodiment of the present invention can automatically calculate the setting temperature of the electric water heater assembly, thereby balancing the cold water in the pipeline between the gas water heater and the thermostat, and effectively avoiding the failure of all the cold water in the pipeline to enter the electric water heater assembly. Affect the water outlet water temperature of the electric water heater assembly, and at the same time, effectively avoid the problem that the gas water heater does not start due to the low water outlet flow caused by the excessively high setting temperature of the electric water heater assembly and the low outlet water temperature set by the user, so as to ensure the user's use The gas water heater can be ignited and started when the water is hot.

In addition, the fuel-fired hot water system according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the above-mentioned gas-fired hot water system further includes a second detection module, the second detection module is arranged at the water inlet of the electric water heater assembly to detect the water temperature of the water inlet of the electric water heater assembly The water flow rate of the water inlet, wherein, when the water outlet of the thermostat assembly is discharging water at a preset flow rate, the second detection module detects the water temperature of the first water inlet of the electric water heater assembly, and the control module starts timing, And when the second detection module detects the water temperature of the second water inlet of the electric water heater assembly, the control module stops timing, and calculates the temperature of the gas water heater according to the timing time and the water flow of the water inlet of the electric water heater assembly. The water storage volume from the water outlet to the water inlet of the electric water heater assembly, wherein the water temperature of the second water inlet is higher than the water temperature of the first water inlet.

According to an embodiment of the present invention, the control module acquires the water flow rate of the first water inlet of the thermostatic assembly and the water flow rate of the first water inlet of the thermostatic assembly and the Two water inlet water flow rates, and calculate the set temperature of the electric water heater assembly according to the following formula:

(1+m2/m1)t-m2t2/m1≤t1≤(1+q2/q1)t-q2t2/q1

Wherein, m1 is the capacity of the electric water heater assembly, m2 is the water storage capacity, t1 is the setting temperature of the electric water heater assembly, t2 is the water temperature in the water supply pipe, and t is the water temperature of the water outlet of the constant temperature assembly, q1 is the water flow rate of the first water inlet of the thermostatic assembly, and q2 is the water flow rate of the second water inlet of the thermostatic assembly.

According to an embodiment of the present invention, the thermostatic component is an electronic thermostatic valve.

According to an embodiment of the present invention, the water supply pipe is further provided with a check valve.

According to an embodiment of the present invention, the outlet pipe of the gas water heater is also connected to a second water end.

According to an embodiment of the present invention, the first detection module is arranged at the second water inlet of the thermostat assembly.

In order to achieve the above purpose, another embodiment of the present invention proposes a control method for a gas-fired hot water system, the gas-fired water heater includes a gas water heater and a constant temperature device, the water inlet of the gas water heater is connected to a water supply pipe, the The constant temperature device includes an electric water heater assembly and a constant temperature assembly, the water inlet of the electric water heater assembly is connected to the water outlet of the gas water heater, the water outlet of the electric water heater assembly is connected to the first water inlet of the constant temperature assembly, the The second water inlet of the thermostat assembly is connected to the water supply pipe, and the water outlet of the thermostat assembly is connected to the first water end. The control method includes the following steps: detecting the water temperature in the water supply pipe; obtaining the temperature of the gas water heater The water storage volume from the water outlet to the water inlet of the electric water heater assembly; the electric water heater is calculated according to the water storage volume, the water temperature in the water supply pipe, and the water intake ratio of the first water inlet and the second water inlet of the thermostat assembly. The set temperature of the water heater assembly is used to control the electric water heater assembly according to the set temperature of the electric water heater assembly.

According to the control method of the gas-fired hot water system according to the embodiment of the present invention, the water temperature in the water supply pipe is detected first, and then the water storage amount from the water outlet of the gas water heater to the water inlet of the electric water heater assembly is obtained, and according to the water storage amount, the water temperature in the water supply pipe, and the constant temperature The water inlet ratio of the first water inlet and the second water inlet of the component calculates the set temperature of the electric water heater component, so as to control the electric water heater component according to the set temperature of the electric water heater component. Therefore, the control method of the gas-fired hot water system in the embodiment of the present invention can automatically calculate the setting temperature of the electric water heater components, thereby balancing the cold water in the pipeline between the gas water heater and the thermostat, and effectively avoiding that all the cold water in the pipeline enters the electric heating system. The water heater component affects the outlet water temperature of the electric water heater component. At the same time, it effectively avoids the problem that the gas water heater does not start due to too small outlet water flow caused by the excessively high setting temperature of the electric water heater component and the low outlet water temperature set by the user, thereby Ensure that the gas water heater can be ignited and started when the user uses hot water.

In addition, the control method of the fuel-fired hot water system according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the above-mentioned control method of the gas-fired hot water system further detects the water temperature and water flow rate of the water inlet of the electric water heater assembly, wherein the preset flow rate When the water comes out and the water temperature of the first water inlet of the electric water heater assembly is detected, the timing is started, and when the water temperature of the second water inlet of the electric water heater assembly is detected, the timing is stopped, wherein the water temperature of the second water inlet is greater than The water temperature of the first water inlet; calculate the water storage volume from the water outlet of the gas water heater to the water inlet of the electric water heater assembly according to the timing time and the water flow of the water inlet of the electric water heater assembly.

According to an embodiment of the present invention, the control method of the above-mentioned fuel-fired hot water system further obtains the water flow rate of the first water inlet of the thermostatic assembly according to the water inlet ratio of the first water inlet and the second water inlet of the thermostatic assembly and the water flow of the second water inlet of the thermostatic assembly, and calculate the setting temperature of the electric water heater assembly according to the following formula:

(1+m2/m1)t-m2t2/m1≤t1≤(1+q2/q1)t-q2t2/q1

Wherein, m1 is the capacity of the electric water heater assembly, m2 is the water storage capacity, t1 is the setting temperature of the electric water heater assembly, t2 is the water temperature in the water supply pipe, and t is the water temperature of the water outlet of the constant temperature assembly, q1 is the water flow rate of the first water inlet of the thermostatic assembly, and q2 is the water flow rate of the second water inlet of the thermostatic assembly.

Description of drawings

Fig. 1 is a schematic block diagram of a fuel-fired hot water system according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram of a fuel-fired hot water system according to another embodiment of the present invention.

Fig. 3 is a flow chart of a control method of a fuel-fired hot water system according to an embodiment of the present invention.

Reference numerals: gas water heater 10 , thermostat 20 , electric water heater assembly 21 , thermostat assembly 22 , first detection module 30 , first water end 41 , second water end 42 , detection module 50 and check valve 60 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The fuel-fired water heating system and the control method of the fuel-fired water heating system according to the embodiments of the present invention are described below with reference to the accompanying drawings.

Fig. 1 is a schematic block diagram of a fuel-fired hot water system according to an embodiment of the present invention. As shown in FIG. 1 , the fuel-fired hot water system includes: a gas water heater 10 , a thermostat 20 , a first detection module 30 and a control module (not specifically shown in the figure).

Wherein, the water inlet of gas water heater 10 is connected to water supply pipe, and constant temperature device 20 comprises electric water heater assembly 21 and thermostat assembly 22, and the water inlet of electric water heater assembly 21 is connected with the water outlet of gas water heater 10, and the water outlet of electric water heater assembly 21 is connected with The first water inlet of the thermostatic assembly 22 is connected, the second water inlet of the thermostatic assembly 22 is connected to the water supply pipe, the water outlet of the thermostatic assembly 22 is connected to the first water end 41, and the first detection module 30 is used to detect the water temperature in the water supply pipe and control The module is used to obtain the water storage volume from the water outlet of the gas water heater 10 to the water inlet of the electric water heater assembly 21, and calculate according to the water storage volume, the water temperature in the water supply pipe, and the water intake ratio of the first water inlet and the second water inlet of the thermostat assembly 22 The set temperature of the electric water heater assembly 21 is used to control the electric water heater assembly 21 according to the set temperature of the electric water heater assembly 21 .

Specifically, as users' requirements for hot water continue to increase, gradually a single water heater can no longer meet the requirements of users, especially some users who have high requirements for bathing comfort. Different water temperatures can be provided at different times, and multiple points can be bathed at the same time. Based on the continuous improvement of users' requirements for bathing comfort, users have higher and higher requirements for water heaters. Therefore, the combination of gas water heater 10 and thermostat 20 is used to provide users with hot water at a constant temperature. 20 includes an electric water heater assembly 21 and a thermostatic assembly 22, and the electric water heater assembly 21 includes a water storage tank and a heating pipe. The hot water from the gas water heater 10 is heated to a certain temperature by the electric water heater assembly 21 and then enters the constant temperature assembly 22. The control module controls the water inlet ratio of the first water inlet and the second water inlet of the constant temperature assembly 22 according to the outlet water temperature set by the user. Thereby providing users with hot water at a constant temperature.

However, when the water temperature setting in the electric water heater assembly 21 is high, and the outlet water temperature set by the user is relatively low, the control module will adjust the water inlet ratio of the first water inlet of the thermostat assembly 22 to a very low level, which may be lower than that of the gas The water heater 10 starts the ignition flow. Therefore, the setting temperature of the electric water heater assembly 21 should not be too high, and the temperature difference between the cold water in the water supply pipe in summer and winter is relatively large. If the electric water heater assembly 21 maintains a set temperature in winter and summer, it is likely In summer, when the temperature of the cold water in the water supply pipe is high and the temperature of the outlet water set by the user is low, the amount of hot water required may be lower than the gas water heater 10 to start the ignition flow. Without starting, the water entering the electric water heater assembly 21 is cold water, thereby greatly reducing the water temperature of the electric water heater assembly 21, causing the water temperature of the water outlet of the constant temperature assembly 22 to drop more; and the setting temperature of the electric water heater assembly 21 can not be too low, if If the set temperature is too low, after all the cold water in the pipeline between the gas water heater 10 and the thermostat 20 enters the electric water heater assembly 21, the water temperature of the electric water heater assembly 21 will be greatly reduced, thereby affecting the water temperature of the water outlet of the thermostat assembly 22.

Therefore, in order to prevent the gas water heater 10 from not starting due to the too small water outlet flow rate of the gas water heater 10, and to avoid a significant drop in the water temperature of the water outlet of the electric water heater assembly 21, the present invention is based on the storage in the pipeline between the gas water heater 10 and the thermostat 20. Calculate the set temperature of the electric water heater assembly 21 according to the set temperature of the water quantity, the water temperature in the water supply pipe, and the water intake ratio of the first water inlet and the second water inlet of the thermostatic assembly 22, and control the electric water heater assembly 21 according to the set temperature of the electric water heater assembly 21, Therefore, it is ensured that the water outlet flow rate of the gas water heater 10 is not too small to cause ignition and start-up, and the cold water in the pipeline will not have a great influence on the water temperature of the water outlet of the electric water heater assembly 21 .

According to an embodiment of the present invention, as shown in FIG. 1 , the first detection module 30 is disposed at the second water inlet of the thermostatic assembly 22 .

According to an embodiment of the present invention, as shown in FIG. 1 , the above-mentioned gas-fired hot water system further includes a second detection module 50, and the second detection module 50 is arranged at the water inlet of the electric water heater assembly 21 to detect the progress of the electric water heater assembly 21. The water temperature of the water outlet and the water flow rate of the water inlet. Wherein, when the water outlet of the thermostat assembly 22 outputs water at a preset flow rate, the second detection module 50 detects the water temperature of the first water inlet of the electric water heater assembly 21, and the control module starts timing. When the second detection module 50 detects the water temperature of the second water inlet of the electric water heater assembly 21, the control module stops timing, and calculates the water outlet of the gas water heater 10 to the electric water heater assembly 21 according to the timing time and the water flow of the water inlet of the electric water heater assembly 21 The water storage capacity of the water inlet, wherein the water temperature of the second water inlet is higher than the water temperature of the first water inlet, for example, the difference between the water temperature of the second water inlet and the water temperature of the first water inlet may be more than 10°C.

According to an embodiment of the present invention, the control module obtains the water flow rate of the first water inlet of the thermostatic assembly 22 and the water flow rate of the second water inlet of the thermostatic assembly 22 according to the water intake ratio of the first water inlet and the second water inlet of the thermostatic assembly 22 , and calculate the setting temperature of the electric water heater assembly according to the following formula (1):

(1+m2/m1)t-m2t2/m1≤t1≤(1+q2/q1)t-q2t2/q1 (1)

Among them, m1 is the capacity of the electric water heater assembly, m2 is the water storage capacity, t1 is the setting temperature of the electric water heater assembly, t2 is the water temperature in the water supply pipe, t is the water outlet temperature of the constant temperature assembly, and q1 is the first water inlet water of the constant temperature assembly Flow rate, q2 is the water flow rate of the second water inlet of the constant temperature component.

Specifically, as shown in FIG. 1 , one end of the water supply pipe is connected to the municipal water supply, and the other end of the water supply pipe is respectively connected to the gas water heater 10 and each water terminal. The fuel-fired hot water system may include a constant temperature device 20, the constant temperature device 20 is composed of an electric water heater assembly 21 and a constant temperature assembly 22, the constant temperature device 20 has two water inlets and one water outlet, wherein the water inlet of the electric water heater assembly 21 serves as a constant temperature The hot water inlet of the device 20 is connected to the water outlet pipe of the gas water heater 10 , the second water inlet of the thermostat assembly 22 is connected to the water supply pipe as the cold water inlet of the thermostat device 20 , and the water outlet of the thermostat assembly 22 is used as the water outlet of the thermostat device 20 It is connected with the first water terminal 41. The hot water coming out of the gas water heater 10 is first heated by the electric water heater assembly 21 and then enters the thermostatic assembly 22, through which the hot water at the temperature required by the user is output.

When the user installs the above system for the first time, the installer can determine the amount of water stored between the gas water heater 10 and the thermostat 20 according to the following method: After the above system is installed, open the nearest water end of the thermostat 20 such as the first water end 41 The hot water outlet, and output with the preset flow rate, while the second detection module 50 detects the water temperature of the water inlet of the electric water heater assembly 21 and records the start time, when the water temperature of the water inlet of the electric water heater assembly 21 detected by the second detection module 50 When the water temperature at the water inlet of the electric water heater assembly 21 detected at the beginning is 10°C or more, the control module stops timing and records the current time, the control module calculates the difference between the recorded stop time and the recorded start time, and stores the time difference Multiply the water flow rate of the water inlet of the electric water heater assembly 21 detected by the second detection module 50 to obtain the amount of water stored in the pipeline between the gas water heater 10 and the thermostat 20 , and record the amount of water stored.

After the gas-fired hot water system is in operation, the first detection module 30 detects the water temperature in the water supply pipe, and then according to the water temperature in the water supply pipe, the amount of water stored in the pipeline between the gas water heater 10 and the thermostat 20, and according to the following formula (2) Calculate the setting temperature of the electric water heater assembly 21.

m1t1+m2t2=(m1+m2)t (2)

The set temperature of the electric water heater assembly 21 can be obtained by deforming the above formula (2) as the following formula (3):

t1=(1+m2/m1)t-m2t2/m1 (3)

Wherein, the temperature t of the water outlet of the thermostatic assembly 22 is not less than the set temperature of the electric water heater assembly 21 minus 3° C. Therefore, the set temperature t1 of the electric water heater assembly 21 has a minimum value.

In addition, it has been analyzed above that the water outlet flow rate of the gas water heater 10 cannot be too small, therefore, the set temperature of the electric water heater assembly 21 can be obtained by the following formula (4):

q1t1+q2t2=(q1+q2)t (4)

The set temperature of the electric water heater assembly 21 can be obtained by deforming the above formula (4) as the following formula (5):

t1=(1+q2/q1)t-q2t2/q1 (5)

In order to ensure that the gas water heater 10 can be ignited and started, the water flow rate q1 of the first water inlet of the thermostatic assembly 22 cannot be less than 3 L/min. Therefore, the setting temperature t1 of the electric water heater assembly 21 has a maximum value.

The control module automatically calculates the setting temperature t1 of the electric water heater assembly 21 in combination with the above formula (3) and formula (5), so as to ensure that the outlet water temperature of the thermostat 20 is constant without being affected by the cold water in the pipeline, and at the same time it will not affect the gas water heater 10 Start the ignition.

According to an embodiment of the present invention, the thermostatic component 22 is an electronic thermostatic valve.

The electronic thermostatic valve can automatically adjust the water inlet ratio of cold and hot water according to the water outlet temperature set by the user and the water outlet temperature of the thermostatic assembly 22, thereby accurately controlling the water outlet temperature. In addition, the capacity of the electric water heater assembly 21 can be about 6L, an electric heater can be arranged inside, and its heating efficiency is relatively high, and the water inlet and the water outlet of the electric water heater assembly 21 are equipped with anti-corrosion Electric wall to ensure water safety. Since the capacity of the electric water heater assembly 21 is about 6L, and the volume of the thermostat assembly 22 is relatively small, the volume of the thermostat device 20 is relatively small and can be hidden and installed.

According to an embodiment of the present invention, as shown in FIG. 2 , the outlet pipe of the gas water heater 10 is also connected to a second water end 42 .

It should be noted that, when the user does not require high temperature of hot water, the gas water heater 10 can be directly connected to the water end. In addition, when the gas-fired hot water system needs to provide hot water at a constant temperature for multiple bathrooms, a thermostat can be installed in each bathroom, and different outlet water temperatures can be set for different bathrooms to meet different user needs.

According to an embodiment of the present invention, as shown in FIG. 1 or FIG. 2 , a check valve 60 is provided on the water supply pipe to effectively prevent the water in the water tank of the gas water heater 10 and the water at each water end from flowing back.

In summary, according to the gas-fired hot water system of the embodiment of the present invention, the water inlet of the gas water heater is connected to the water supply pipe, the constant temperature device includes an electric water heater assembly and a constant temperature assembly, the water inlet of the electric water heater assembly is connected to the water outlet of the gas water heater, The water outlet of the electric water heater component is connected to the first water inlet of the constant temperature component, the second water inlet of the constant temperature component is connected to the water supply pipe, the water outlet of the constant temperature component is connected to the first water end, the first detection module detects the water temperature in the water supply pipe, and controls The module obtains the water storage volume from the water outlet of the gas water heater to the water inlet of the electric water heater assembly, and calculates the setting of the electric water heater assembly according to the water storage volume, the water temperature in the water supply pipe, and the ratio of water inflow between the first water inlet and the second water inlet of the thermostat assembly Temperature to control the electric water heater assembly according to the set temperature of the electric water heater assembly. Therefore, the gas-fired hot water system in the embodiment of the present invention can automatically calculate the setting temperature of the electric water heater assembly, thereby balancing the cold water in the pipeline between the gas water heater and the thermostat, and effectively avoiding the failure of all the cold water in the pipeline to enter the electric water heater assembly. Affect the water outlet water temperature of the electric water heater assembly, and at the same time, effectively avoid the problem that the gas water heater does not start due to the low water outlet flow caused by the excessively high setting temperature of the electric water heater assembly and the low outlet water temperature set by the user, so as to ensure the user's use The gas water heater can be ignited and started when the water is hot.

Fig. 3 is a flowchart of a control method for a gas-fired water heating system according to an embodiment of the present invention, wherein the gas-fired water heating system includes a gas water heater and a constant temperature device, the water inlet of the gas water heater is connected to a water supply pipe, and the temperature control device includes an electric water heater assembly and a constant temperature device The constant temperature component, the water inlet of the electric water heater component is connected to the water outlet of the gas water heater, the water outlet of the electric water heater component is connected to the first water inlet of the constant temperature component, the second water inlet of the constant temperature component is connected to the water supply pipe, and the water outlet of the constant temperature component Connect to the first water terminal.

Specifically, as users' requirements for hot water continue to increase, gradually a single water heater can no longer meet the requirements of users, especially some users who have high requirements for bathing comfort. Different water temperatures can be provided at different times, and multiple points can be bathed at the same time. Based on the continuous improvement of users' requirements for bathing comfort, users have higher and higher requirements for water heaters. Therefore, a combination of gas water heaters and constant temperature devices is used to provide users with hot water at a constant temperature. Water heater components and constant temperature components, electric water heater components include water storage tanks and heating pipes. The hot water from the gas water heater is heated to a certain temperature by the electric water heater component and then enters the constant temperature component. Hot water at a constant temperature.

However, when the water temperature setting in the electric water heater assembly is high, and the outlet water temperature set by the user is relatively low, the control module will adjust the water inlet ratio of the first water inlet of the thermostat assembly to a very low level, which may be lower than the gas water heater startup. Therefore, the setting temperature of the electric water heater assembly should not be too high, and the temperature difference between the cold water in the water supply pipe in summer and winter is relatively large. When the outlet water temperature set by the user is low, the required hot water volume may be lower than the gas water heater ignition flow. The water is cold water, which greatly reduces the water temperature of the electric water heater assembly, resulting in a large drop in water temperature at the water outlet of the constant temperature assembly; and the setting temperature of the electric water heater assembly should not be too low. After all the cold water in the pipeline enters the electric water heater assembly, the water temperature of the electric water heater assembly will be greatly reduced, thereby affecting the water temperature of the water outlet of the electric water heater assembly.

Therefore, in order to prevent the gas water heater from not starting due to the too small water outlet flow rate of the gas water heater, and to avoid a significant drop in water temperature at the water outlet of the electric water heater assembly, the present invention proposes a control method for the electric hot water system.

As shown in Figure 3, the control method of the fuel-fired hot water system includes the following steps:

S1, detecting the water temperature in the water supply pipe.

S2, obtaining the water storage volume from the water outlet of the gas water heater to the water inlet of the electric water heater assembly.

According to an embodiment of the present invention, the control method of the above-mentioned gas-fired hot water system further detects the water temperature and flow rate of the water inlet of the electric water heater assembly, wherein the water is discharged at the water outlet of the constant temperature assembly at a preset flow rate and detected When the water temperature of the first water inlet of the electric water heater assembly is started, timing is started, and when the water temperature of the second water inlet of the electric water heater assembly is detected, the timing is stopped, wherein the water temperature of the second water inlet is greater than the water temperature of the first water inlet; according to the timing time and The water flow rate of the water inlet of the electric water heater assembly calculates the water storage volume from the water outlet of the gas water heater to the water inlet of the electric water heater assembly.

Wherein, the difference between the water temperature of the second water inlet and the water temperature of the first water inlet may be above 10°C.

S3, calculate the set temperature of the electric water heater assembly according to the water storage, the water temperature in the water supply pipe, and the water intake ratio of the first water inlet and the second water inlet of the thermostat assembly, so as to control the electric water heater assembly according to the set temperature of the electric water heater assembly.

According to an embodiment of the present invention, the control method of the above-mentioned fuel-fired hot water system further obtains the water flow rate of the first water inlet of the constant temperature component and the water flow rate of the constant temperature component according to the water intake ratio of the first water inlet and the second water inlet of the constant temperature component The water flow rate of the second water inlet, and calculate the setting temperature of the electric water heater assembly according to the above formula (1).

Specifically, as shown in FIG. 1 , one end of the water supply pipe is connected to the municipal water supply, and the other end of the water supply pipe is respectively connected to the gas water heater and each water terminal. The gas-fired hot water system may include a constant temperature device. The constant temperature device is composed of an electric water heater assembly and a constant temperature assembly. The constant temperature device has two water inlets and one water outlet. The water inlet of the electric water heater assembly is used as the hot water inlet of the constant temperature device. It is connected with the outlet pipe of the gas water heater, the second water inlet of the thermostat assembly is connected to the water supply pipe as the cold water inlet of the thermostat device, and the water outlet of the thermostat assembly is connected to the first water end as the water outlet of the thermostat device. The hot water from the gas water heater is first heated by the electric water heater component and then enters the constant temperature component, and the hot water at the temperature required by the user is output through the constant temperature component.

When the user installs the above system for the first time, the installer can determine the amount of water stored between the gas water heater and the thermostat device according to the following method: After the above system is installed, open the hot water outlet at the nearest water end of the thermostat device, such as the first water end , and output at the preset flow rate, while the second detection module detects the water temperature of the water inlet of the electric water heater assembly and records the start time, when the water temperature of the water inlet of the electric water heater assembly detected by the second detection module is higher than the electric water heater assembly detected at the beginning When the water temperature at the water inlet is above 10°C, the control module stops timing and records the current time. The control module calculates the difference between the recorded stop time and the recorded start time, and multiplies the time difference by the electric water heater detected by the second detection module. The water flow rate at the water inlet of the component is used to obtain the amount of water stored in the pipeline between the gas water heater and the thermostat, and record the amount of water stored.

When the gas-fired hot water system is in operation, the first detection module detects the water temperature in the water supply pipe, and then calculates the electric water heater component according to the above formula (3) according to the water temperature in the water supply pipe and the water storage in the pipeline between the gas water heater and the thermostat. set temperature. Wherein, the temperature t of the water outlet of the constant temperature assembly is not less than the set temperature of the electric water heater assembly minus 3°C, therefore, the set temperature t1 of the electric water heater assembly has a minimum value.

In addition, since the outlet flow rate of the gas water heater cannot be too small, the setting temperature of the electric water heater assembly can be obtained by the above formula (5). In order to ensure that the gas water heater can be ignited and started, the water flow rate q1 of the first water inlet of the thermostatic assembly cannot be less than 3L/min. Therefore, the set temperature t1 of the electric water heater assembly has a maximum value.

The control module automatically calculates the setting temperature t1 of the electric water heater assembly by combining the above formula (3) and formula (5), so as to ensure that the outlet water temperature of the thermostat is constant without being affected by the cold water in the pipeline, and at the same time, it will not affect the ignition of the gas water heater.

It should be noted that when the user does not require high hot water temperature, the gas water heater can be directly connected to the water end. In addition, when the gas-fired hot water system needs to provide hot water at a constant temperature for multiple bathrooms, a thermostat can be installed in each bathroom, and different outlet water temperatures can be set for different bathrooms to meet different user needs.

To sum up, the control method of the gas-fired hot water system is to calculate the electric water heater according to the water storage in the pipeline between the gas water heater and the thermostat, the water temperature in the water supply pipe, and the water intake ratio of the first water inlet and the second water inlet of the thermostat component. The set temperature of the components, and control the electric water heater components according to the set temperature of the electric water heater components, so as to ensure that the outlet water flow of the gas water heater will not be too small to cause ignition, and the cold water in the pipeline will not affect the outlet water temperature of the electric water heater components. have a greater impact.

According to the control method of the gas-fired hot water system according to the embodiment of the present invention, the water temperature in the water supply pipe is detected first, and then the water storage amount from the water outlet of the gas water heater to the water inlet of the electric water heater assembly is obtained, and according to the water storage amount, the water temperature in the water supply pipe, and the constant temperature The water inlet ratio of the first water inlet and the second water inlet of the component calculates the set temperature of the electric water heater component, so as to control the electric water heater component according to the set temperature of the electric water heater component. Therefore, the control method of the gas-fired hot water system in the embodiment of the present invention can automatically calculate the setting temperature of the electric water heater components, thereby balancing the cold water in the pipeline between the gas water heater and the thermostat, and effectively avoiding that all the cold water in the pipeline enters the electric heating system. The water heater component affects the outlet water temperature of the electric water heater component. At the same time, it effectively avoids the problem that the gas water heater does not start due to too small outlet water flow caused by the excessively high setting temperature of the electric water heater component and the low outlet water temperature set by the user, thereby Ensure that the gas water heater can be ignited and started when the user uses hot water.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. one kind combustion electric water heating system, it is characterised in that including：

Gas heater, the water inlet of the gas heater are connected to feed pipe；

Thermostat, the thermostat include electric heater component and thermostatic assembly, the water inlet of the electric heater component It is connected with the delivery port of the gas heater, the delivery port of the electric heater component and the first water inlet of the thermostatic assembly Mouth connection, the second water inlet of the thermostatic assembly are connected to the feed pipe, the delivery port connection first of the thermostatic assembly Use water end (W.E.)；

First detection module, the first detection module are used to detect the water temperature in the feed pipe；

Control module, the control module are used for delivery port the entering to the electric heater component for obtaining the gas heater The water-holding quantity at the mouth of a river, and according to the water temperature and the first water inlet of the thermostatic assembly in the water-holding quantity, the feed pipe The setting temperature of the electric heater component is calculated with the water inlet ratio of the second water inlet, with according to the electric heater component Temperature is set to be controlled the electric heater component.

2. combustion electric water heating system according to claim 1, it is characterised in that also including the second detection module, described second Detection module be arranged on the water inlet of the electric heater component with detect the water inlet water temperature of the electric heater component and Water inlet water-carrying capacity, wherein, when the delivery port of the thermostatic assembly is with default flow water outlet, the second detection module inspection The first water inlet water temperature of the electric heater component is measured, the control module starts timing, and detects mould described second When block detects the second water inlet water temperature of the electric heater component, the control module stops timing, and during according to timing Between and the water inlet water-carrying capacity of the electric heater component calculate the delivery port of the gas heater to the electric heater group The water-holding quantity of the water inlet of part, wherein, the second water inlet water temperature is more than the first water inlet water temperature.

3. combustion electric water heating system according to claim 1 or 2, it is characterised in that the control module is according to the constant temperature First water inlet of component and the water inlet ratio of the second water inlet obtain the first water inlet water-carrying capacity and the institute of the thermostatic assembly The second water inlet water-carrying capacity of thermostatic assembly is stated, and the setting temperature of the electric heater component is calculated according to below equation：

(1+m2/m1)t-m2t2/m1≤t1≤(1+q2/q1)t-q2t2/q1

Wherein, m1 is the capacity of the electric heater component, and m2 is the water-holding quantity, and t1 is the setting of the electric heater component Temperature, t2 are the water temperature in the feed pipe, and t is the delivery port water temperature of the thermostatic assembly, and q1 is the of the thermostatic assembly One water inlet water-carrying capacity, q2 are the second water inlet water-carrying capacity of the thermostatic assembly.

4. combustion electric water heating system according to claim 1, it is characterised in that the thermostatic assembly is electronic thermostatic valve.

5. combustion electric water heating system according to claim 1, it is characterised in that be additionally provided with check-valves on the feed pipe.

6. combustion electric water heating system according to claim 1, it is characterised in that the outlet pipe of the gas heater is also connected with There is second to use water end (W.E.).

7. combustion electric water heating system according to claim 1, it is characterised in that the first detection module is arranged on the perseverance Second water inlet of warm component.

8. it is a kind of fire electric water heating system control method, it is characterised in that it is described combustion electric water heating system include gas heater and Thermostat, the water inlet of the gas heater are connected to feed pipe, and the thermostat includes electric heater component and perseverance Warm component, the water inlet of the electric heater component are connected with the delivery port of the gas heater, the electric heater component Delivery port be connected with the first water inlet of the thermostatic assembly, the second water inlet of the thermostatic assembly is connected to the water supply Water end (W.E.) is used in pipe, the delivery port connection first of the thermostatic assembly, and the control method comprises the following steps：

Detect the water temperature in the feed pipe；

The delivery port of the gas heater is obtained to the water-holding quantity of the water inlet of the electric heater component；

According to the water temperature and the first water inlet of the thermostatic assembly and the second water inlet in the water-holding quantity, the feed pipe Water inlet ratio calculate the setting temperature of the electric heater component, with according to the setting temperature of the electric heater component to institute Electric heater component is stated to be controlled.

9. the control method of combustion electric water heating system according to claim 8, it is characterised in that also detect the electric heater The water inlet water temperature and water inlet water-carrying capacity of component, wherein,

With default flow water outlet and detect that the first of the electric heater component intakes in the delivery port of the thermostatic assembly During saliva temperature, start timing, and when detecting the second water inlet water temperature of the electric heater component, stop timing, wherein, The second water inlet water temperature is more than the first water inlet water temperature；

The delivery port of the gas heater is calculated extremely according to the water inlet water-carrying capacity of timing time and the electric heater component The water-holding quantity of the water inlet of the electric heater component.

10. the control method of combustion electric water heating system according to claim 8 or claim 9, it is characterised in that always according to the constant temperature First water inlet of component and the water inlet ratio of the second water inlet obtain the first water inlet water-carrying capacity and the institute of the thermostatic assembly The second water inlet water-carrying capacity of thermostatic assembly is stated, and the setting temperature of the electric heater component is calculated according to below equation：

(1+m2/m1)t-m2t2/m1≤t1≤(1+q2/q1)t-q2t2/q1

Wherein, m1 is the capacity of the electric heater component, and m2 is the water-holding quantity, and t1 is the setting of the electric heater component Temperature, t2 are the water temperature in the feed pipe, and t is the delivery port water temperature of the thermostatic assembly, and q1 is the of the thermostatic assembly One water inlet water-carrying capacity, q2 are the second water inlet water-carrying capacity of the thermostatic assembly.