CN110878993A - Non-overflow automatic water replenishing control system and method for solar water heater - Google Patents
Non-overflow automatic water replenishing control system and method for solar water heater Download PDFInfo
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- CN110878993A CN110878993A CN201911212526.5A CN201911212526A CN110878993A CN 110878993 A CN110878993 A CN 110878993A CN 201911212526 A CN201911212526 A CN 201911212526A CN 110878993 A CN110878993 A CN 110878993A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Abstract
The invention discloses a non-overflow automatic water replenishing control system and method for a solar water heater. One end of a hot water pipeline in the system is connected with a water tank of a water heater, and the other end of the hot water pipeline is connected with a user load; the cold water pipeline is connected with the hot water pipeline through a water replenishing pipeline; the temperature sensor and the flow sensor are both arranged on the hot water pipeline and are both positioned between the hot water pipeline and the pipeline connecting point; the pipeline connecting point is a connecting point of the hot water pipeline and the water replenishing pipeline; the water replenishing valve is arranged on the water replenishing pipeline; the water replenishing control valves are all connected with a temperature sensor, a flow sensor and a relay; the relay is connected with the water replenishing valve; the water replenishing controller is used for acquiring the temperature acquired by the temperature sensor and the flow acquired by the flow sensor and controlling the opening and closing of the water replenishing valve through a relay. By adopting the system or the method, the problem of overflow caused by failure of the liquid level sensor in the liquid control automatic water replenishing system can be solved.
Description
Technical Field
The invention relates to the technical field of solar water heaters, in particular to a non-overflow automatic water replenishing control system and method for a solar water heater.
Background
At present, the water replenishing control of a non-pressure-bearing solar water heater is mainly realized by manual control or automatic liquid level control. When a manual water replenishing mode is adopted, due to the fact that the estimation of the water storage capacity of the water tank by the sensor signal is lacked, the situations of insufficient water replenishing or overflow caused by water replenishing interference and the like usually occur; when the liquid level control is adopted, the water replenishing controller controls the water replenishing valve to open and close to realize automatic water replenishing by judging whether the liquid level signal reaches the upper limit of the water tank.
However, in the actual operation of the liquid level control automatic water supply system, the problem of out-of-control automatic water supply function often occurs, and the main reason for the problem is that the liquid level sensor fails, the signal output of the sensor is deteriorated due to the serious scale problem of the water supply quality, or the electronic components of the sensor are damaged due to the rapid aging of the solar water tank under the working condition of 100 ℃ or higher. The problem that the automatic water supply function is out of control when the liquid level control automatic water supply system is used can lead to a large amount of water to continuously overflow from the water tank, and then the great waste of water resources is caused.
Disclosure of Invention
Therefore, it is necessary to provide a non-overflow automatic water supply control system and method for a solar water heater to solve the problem of overflow caused by failure of a liquid level sensor in a liquid control automatic water supply system.
In order to achieve the purpose, the invention provides the following scheme:
the utility model provides a solar water heater non-overflow formula automatic water supply control system, includes: the system comprises a hot water pipeline, a cold water pipeline, a water supplementing pipeline, a temperature sensor, a flow sensor, a water supplementing valve, a water supplementing controller and a relay;
one end of the hot water pipeline is connected with a water tank of the water heater, and the other end of the hot water pipeline is connected with a user load; the cold water pipeline is connected with the hot water pipeline through the water replenishing pipeline; the temperature sensor and the flow sensor are both arranged on the hot water pipeline, and are both positioned between the hot water pipeline and a pipeline connecting point; the pipeline connecting point is a connecting point of the hot water pipeline and the water replenishing pipeline; the water replenishing valve is arranged on the water replenishing pipeline; the water replenishing control valve is respectively connected with the temperature sensor, the flow sensor and the relay; the relay is connected with the water replenishing valve; the water replenishing controller is used for acquiring the temperature acquired by the temperature sensor and the flow acquired by the flow sensor and controlling the opening and closing of the water replenishing valve through the relay.
Optionally, the flow sensor is a bidirectional electromagnetic sensor.
Optionally, the flow sensor is a bidirectional inner and outer pipe differential pressure sensor.
The invention also provides a non-overflow automatic water replenishing control method for the solar water heater, which is used for the non-overflow automatic water replenishing control system for the solar water heater, and comprises the following steps:
determining the state of the water heater at the current sampling time; the water heater state comprises a water using state and a water supplementing state; in the water using state, the relay is in a low level state, and the water supplementing valve is in a disconnected state; under the water replenishing state, the relay is in a high level state, and the water replenishing valve is in a disconnected state;
acquiring the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time;
calculating the current accumulated water consumption according to the state of the water heater at the current sampling time, the current flow and the current sampling time;
judging whether the current accumulated water consumption meets water supplementing conditions or not; the water supplementing condition is that the current accumulated water consumption is greater than or equal to a water amount upper limit set value, or the current temperature is within water supplementing set time;
if the current accumulated water consumption does not meet the water supplementing condition, judging whether the current accumulated water consumption is less than or equal to a water lower limit set value;
if the current accumulated water consumption is less than or equal to the water quantity lower limit set value, updating the current sampling time, adjusting the state of the water heater at the current sampling time to be a water consumption state, and returning to the acquisition of the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time;
if the current accumulated water consumption is larger than the lower limit set value of the water quantity, updating the current sampling time, keeping the state of the water heater at the current sampling time, and returning to the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time;
if the current accumulated water consumption meets the water supplementing condition, judging whether the current temperature is less than or equal to a set temperature;
if the current temperature is less than or equal to the set temperature, updating the current sampling time, adjusting the state of the water heater at the current sampling time to be a water supplementing state, and returning to the acquisition of the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time;
and if the current temperature is higher than the set temperature, updating the current sampling time, adjusting the state of the water heater at the current sampling time to be a water using state, and returning to the acquisition of the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time.
Optionally, the current flow rate is:
wherein, q (T) is the current flow rate at the current sampling time T, D is the pipe inner diameter of the hot water pipe, B is the magnetic induction of the externally applied magnetic field, and f (T) is the electrical signal acquired by the flow sensor at the current sampling time T.
Optionally, the current flow rate is:
ρ(t)＝2×10-5t3-6×10-3t2+2×10-2t+1000(kg/m3)，
wherein, q (T) is the current flow at the current sampling time T, K is a flow coefficient, f (T) is an electrical signal acquired by the flow sensor at the current sampling time T, ρ (T) is the relationship between the density and temperature of the water flow in the hot water pipe, and T is the temperature of the water flow in the hot water pipe.
Optionally, the calculating the current accumulated water consumption according to the state of the water heater at the current sampling time, the current flow and the current sampling time specifically includes:
Vt(T)＝Vt(T-ΔT)+Q(T)ΔTflag，
wherein, Vt(T) is the current cumulative water consumption at the current sampling time T, Vt(T- Δ T) is the cumulative water consumption at the previous sampling time, Δ T is the sampling time interval, q (T) is the current flow rate at the current sampling time T, and flag is the water heater state, and when the water heater state is the water use state, flag is 1, and when the water heater state is the water supplement state, flag is-1.
Optionally, the water replenishing set time is from four to half to five hours in the morning.
Optionally, the set upper limit of the water amount is 80-100% of the total capacity of the water tank of the water heater; the lower limit set value of the water quantity is 0-10% of the total capacity of the water tank of the water heater.
Optionally, the set temperature is 20 ℃ to 25 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a non-overflow automatic water replenishing control system and a non-overflow automatic water replenishing control method for a solar water heater. One end of a hot water pipeline in the system is connected with a water tank of a water heater, and the other end of the hot water pipeline is connected with a user load; the cold water pipeline is connected with the hot water pipeline through a water replenishing pipeline; the temperature sensor and the flow sensor are both arranged on the hot water pipeline and are both positioned between the hot water pipeline and the pipeline connecting point; the pipeline connecting point is a connecting point of the hot water pipeline and the water replenishing pipeline; the water replenishing valve is arranged on the water replenishing pipeline; the water replenishing control valves are all connected with a temperature sensor, a flow sensor and a relay; the relay is connected with the water replenishing valve; the water replenishing controller is used for acquiring the temperature acquired by the temperature sensor and the flow acquired by the flow sensor and controlling the opening and closing of the water replenishing valve through a relay. The invention can realize the non-leakage water supplement of the solar water heater only by the flow sensor and the temperature sensor which are arranged indoors without depending on the liquid level sensor, solves the problem of overflow caused by the failure of the liquid level sensor in the liquid control automatic water supplement system, and has low control cost and high reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a non-overflow automatic water supply control system of a solar water heater according to an embodiment of the present invention;
FIG. 2 is a flow chart of a non-overflow automatic water supply control method for a solar water heater according to an embodiment of the present invention;
fig. 3 is a flow chart of a non-overflow automatic water supply control method for a solar water heater according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a non-overflow automatic water supply control system of a solar water heater according to an embodiment of the present invention.
Referring to fig. 1, the non-overflow automatic water supply control system of the solar water heater of the embodiment includes: the system comprises a hot water pipeline 1, a cold water pipeline 2, a water supplementing pipeline 3, a temperature sensor 4, a flow sensor 5, a water supplementing valve 6, a water supplementing controller 7 and a relay 8. One end of the hot water pipeline 1 is connected with a water tank 9 of the water heater, and the other end of the hot water pipeline 1 is connected with a user load; the cold water pipeline 2 is connected with the hot water pipeline 1 through the water replenishing pipeline 3; the temperature sensor 4 and the flow sensor 5 are both arranged on the hot water pipeline 1, and the temperature sensor 4 and the flow sensor 5 are both positioned between the hot water pipeline 1 and a pipeline connecting point; the pipeline connecting point is a connecting point of the hot water pipeline 1 and the water supplementing pipeline 3; the water replenishing valve 6 is arranged on the water replenishing pipeline 3; the water replenishing control valves are connected with the temperature sensor 4, the flow sensor 5 and the relay 8; the relay 8 is connected with the water replenishing valve 6; and the water supplementing controller 7 is used for acquiring the temperature acquired by the temperature sensor 4 and the flow acquired by the flow sensor 5 and controlling the opening and closing of the water supplementing valve 6 through the relay 8.
In this embodiment, the flow sensor 5 is a bidirectional electromagnetic sensor or a bidirectional internal and external pipe differential pressure sensor. The bidirectional electromagnetic sensor is based on a detection principle that a sensor signal is in a direct proportion relation with flow, for example, according to an electromagnetic induction principle, when water flow in any direction passes through an external magnetic field, an induced potential generated by the sensor signal is in a direct proportion relation with the flow in the direction. The bidirectional inner and outer pipe differential pressure sensor is based on the detection principle that the sensor signal and the flow square are in a direct proportion relation, for example, a differential pressure sensor is arranged in a sleeve type throttling element, and the differential pressure signal between the inner hole water flow and the outer ring water flow of the throttling element and the water flow square are in a direct proportion relation.
In the embodiment, the water replenishing valve 6 is in an 'electric on' mode, and when the water tank 9 of the water heater is in a water using state, the water replenishing controller 7 outputs a low level to the relay 8 to control the water replenishing valve 6 to be switched off; when the water tank 9 of the water heater is in a water supplementing state, the water supplementing controller 7 outputs a high level to the relay 8 so as to control the water supplementing valve 6 to be switched on.
In this embodiment, the water supply controller 7 is set to have a water use state of "positive" and a water supply state of "negative", and the accumulated water consumption of one water heater is set as a storage variable. When the water replenishing controller 7 judges that the accumulated water consumption is greater than the set upper limit value or is in the water replenishing specified time, the water replenishing controller 7 outputs high level to the relay 8 to control the water replenishing valve 6 to be connected for water replenishing operation; otherwise, the water replenishing valve 6 is kept in an off state. When the water replenishing valve 6 is in an off state, the water heater water tank 9 is in a water use mode, sampling signals of the temperature sensor 4 and the flow sensor 5 are input into the water replenishing controller 7, the sampling signals are converted into water use flow according to a corresponding measurement principle formula, and the water use flow is multiplied by a sampling time interval and then accumulated and stored in a positive value mode. When the water replenishing valve 6 is in a connection state, the water heater water tank 9 is in a water replenishing mode, and sampling signals of the temperature sensor 4 and the bidirectional flow sensor 5 are input into the water replenishing controller 7. Firstly, judging whether the acquired temperature signal is greater than a set temperature: if the judgment result is yes, the fact that the water heater water tank 9 is in a water supplementing mode, but the hot water stored in the water heater water tank 9 flows back to a hot water pipeline to cause temperature rise due to reasons such as insufficient water supply pressure and the like is shown, so that the water supplementing controller 7 outputs low level to the relay 8 to operate the water supplementing valve 6 to be switched off; if the judgment result is 'not', the water pressure of the cold water pipeline is sufficient, at this time, sampling signals of the temperature sensor 4 and the bidirectional flow sensor 5 can be input into the water supplementing controller 7, converted into water supplementing flow according to a corresponding measurement principle, multiplied by a sampling time interval, and accumulated and stored in a negative value mode. When the accumulated water consumption flow is smaller than the set lower limit value, the water replenishing controller 7 outputs a low level signal to the relay 8 so as to control the water replenishing valve 6 to be switched off, and the automatic water replenishing work of the current round is completed.
The non-overflow automatic water replenishing control system of the solar water heater provided by the invention does not depend on a liquid level sensor, can realize non-leakage water replenishing of the solar water heater only through the flow sensor 5 and the temperature sensor 4 which are arranged indoors, solves the problem of overflow caused by failure of the liquid level sensor in the liquid control automatic water replenishing system, and has low control cost and high reliability; and the flow sensor 5, the temperature sensor 4, the relay 8, the water replenishing valve 6 and the water replenishing valve 6 in the automatic water replenishing control system are all arranged indoors, so that the structure is simple and the installation is convenient.
The invention also provides a non-overflow automatic water replenishing control method for the solar water heater, and fig. 2 is a flow chart of the non-overflow automatic water replenishing control method for the solar water heater in the embodiment of the invention.
Referring to fig. 2, the non-overflow automatic water supply control method for a solar water heater according to the present embodiment is applied to the non-overflow automatic water supply control system for a solar water heater provided in the foregoing embodiment, and the method includes:
101: determining the state of the water heater at the current sampling time; the water heater state comprises a water using state and a water replenishing state.
In the water using state, the relay is in a low level state, and the water supplementing valve is in a disconnected state; and under the water replenishing state, the relay is in a high-level state, and the water replenishing valve is in a disconnected state.
102: and acquiring the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time.
103: and calculating the current accumulated water consumption according to the state of the water heater at the current sampling time, the current flow and the current sampling time.
104: and judging whether the current accumulated water consumption meets the water supplementing condition.
And the water supplementing condition is that the current accumulated water consumption is greater than or equal to a water amount upper limit set value, or the current temperature is within water supplementing set time.
And if the current accumulated water consumption does not meet the water supplementing condition, executing 105. And if the current accumulated water consumption meets the water supplementing condition, executing 108.
105: and judging whether the current accumulated water consumption is less than or equal to a water quantity lower limit set value or not. And if the current accumulated water consumption is less than or equal to the water quantity lower limit set value, executing 106.
106: and updating the current sampling time, adjusting the water heater state at the current sampling time to be the water using state, and returning to 102. And if the current accumulated water consumption is more than the lower limit set value of the water quantity, executing 107.
107: and updating the current sampling time, keeping the state of the water heater at the current sampling time, and returning to 102.
108: and judging whether the current temperature is less than or equal to a set temperature. If the current temperature is less than or equal to the set temperature, 109 is executed.
109: and updating the current sampling time, adjusting the state of the water heater at the current sampling time to be a water supplementing state, and returning to 102. If the current temperature is greater than the set temperature, 106 is executed.
As an optional implementation manner, when the flow sensor is a bidirectional electromagnetic sensor, the calculation formula of the current flow is as follows:
wherein, q (T) is the current flow rate at the current sampling time T, D is the pipe inner diameter of the hot water pipe, B is the magnetic induction intensity of the externally applied magnetic field, and f (T) is the electrical signal acquired by the flow sensor at the current sampling time T, i.e. the induced electromotive force signal of the bidirectional electromagnetic sensor at the current sampling time T.
As an alternative embodiment, when the flow sensor is a bidirectional inner-outer pipe differential pressure sensor, the current flow is calculated by the following formula:
ρ(t)＝2×10-5t3-6×10-3t2+2×10-2t+1000(kg/m3)，
wherein q (T) is the current flow rate at the current sampling time T, K is a flow coefficient, f (T) is an electrical signal acquired by the flow sensor at the current sampling time T, that is, a pressure difference signal sampled by the bidirectional inner and outer pipe pressure difference sensor between the inner bore water flow and the outer ring water flow of the sleeve-type throttling element at the current sampling time T, ρ (T) is a relationship between the density and the temperature of the water flow in the hot water pipe, and T is the temperature of the water flow in the hot water pipe.
As an optional implementation manner, the calculating a current accumulated water consumption according to the state of the water heater at the current sampling time, the current flow rate, and the current sampling time specifically includes:
Vt(T)＝Vt(T-ΔT)+Q(T)ΔTflag，
wherein, Vt(T) is the current cumulative water consumption at the current sampling time T, Vt(T- Δ T) is the cumulative water consumption at the previous sampling time, Δ T is the sampling time interval, q (T) is the current flow rate at the current sampling time T, and flag is the water heater state, and when the water heater state is the water use state, flag is 1, and when the water heater state is the water supplement state, flag is-1.
As an alternative embodiment, the water replenishing set time is between four and a half to five hours in the morning.
As an optional implementation mode, the upper limit set value of the water quantity is 80-100% of the total capacity of the water tank of the water heater; the lower limit set value of the water quantity is 0-10% of the total capacity of the water tank of the water heater.
As an alternative embodiment, the set temperature is 20 ℃ to 25 ℃.
Two more specific embodiments are provided below.
The first concrete example is as follows:
fig. 3 is a flow chart of a non-overflow automatic water supply control method for a solar water heater according to an embodiment of the invention. Referring to fig. 3, the non-overflow automatic water supply control method for the solar water heater in the present embodiment includes the following steps:
s1: and (5) initializing the control system. Setting a water consumption flag, a relay potential U, a sampling time interval delta T and a water consumption upper limit V1Lower limit of water consumption V0Sampling time T and cumulative water consumption Vt(T). The water use flag is set as a value 1, wherein the solar water heater is in a water use state, and the solar water heater is in a water supplement state; the relay potential U-1 represents high level to control the water replenishing valve to be switched on, and the relay potential U-1 represents low level to control the water replenishing valve to be switched off. Cumulative water consumption Vt(T) is initialized to 0, indicating that the user has not started using the water heater hot water. Then S2 is executed.
S2: the bidirectional electromagnetic sensor and the temperature sensor are sampled once every delta T, and the sampling is carried out at the Tth time: signal f (t) and temperature signal t (t) of the bidirectional electromagnetic sensor, and then S3 is executed.
S3: judging whether the following conditions are met: whether the time T reaches the set water replenishing time or not, or the water consumption V of the time Tt(T) whether or not it is equal to or greater than a set upper limit V1. The set water replenishing time is generally before sunrise, and the specified water replenishing time is 4:30 in the morning to 5:00 in the morning; the upper limit of water consumption V1The water quantity upper limit V is 80-100% of the total capacity of the water tank of the water heater1Is 100% of the water tank capacity of the water heater. If the two judgment conditions meet any one, namely the judgment result is yes, the external condition of water supplement is reached, and S6 can be executed; otherwise, it indicates that the water heater is in the water use state, and the process continues to S4.
S4: judging the water consumption V at the Tth timet(T) whether or not the lower limit V is set0. The lower limit V of the water consumption0Can be set to be 0-10% of the total capacity of the water tank 1 of the water heater, and V is set in the embodiment00. If the result is yes, the maximum water supplement amount or the water consumption V at the Tth time is shownt(T) reaching the minimum, S9 is executed to disconnect the relay, so that the water supplementing system is ensured to be in a safe and water-saving state without overflow; otherwise, S5 is executed.
S5: converting a bidirectional flow sensor signal f (T) into flow according to a bidirectional electromagnetic sensor measurement principle, namely:
wherein, q (T) is the current flow rate at the current sampling time T, D is the pipe inner diameter of the hot water pipe, B is the magnetic induction intensity of the externally applied magnetic field, and f (T) is the induced electromotive force signal of the bidirectional electromagnetic sensor at the current sampling time T, and a quartering pipe is selected in this embodiment. The sampling time T + Δ T is updated, and then S6 is executed.
S6: and updating the accumulated water consumption to obtain the accumulated water consumption at the T +1 th time, and returning to the step S2.
S7: judging whether the sampled temperature signal t (T) is less than or equal to the set temperature t0. The set temperature can be generally set to 20-25 ℃ of the indoor environment temperature, and t is set in the embodiment0At 25 ℃. The sampling temperature signal t (T) is lower than the set temperature t0In time, the temperature is increased due to hot water flowing out of the water tank of the water heater caused by insufficient water supply pressure and the like. If the result is "no" indicating that a backflow situation occurs, i.e., the water supplement interior condition is not satisfied, S9 should be performed. Otherwise, S8 is executed.
S8: setting the potential of the relay as a low level U which is 1, and operating a water replenishing valve to be switched on to perform water replenishing operation; while the water flag is set to-1, and then returns to execution of S5.
S9: setting the potential of the relay to be a low level U which is equal to 0 so as to control the water replenishing valve to be disconnected and stop the water replenishing operation; while the water use flag is set to 1, and then the process returns to S5.
Specific example two:
in the non-overflow automatic water supply control method for the solar water heater, the flow sensor is a bidirectional inner and outer pipe differential pressure type sensor, and the difference from the first concrete example is only that the flow calculation formula is different, and the rest operation flows are the same.
The non-overflow automatic water replenishing control method for the solar water heater provided by the invention has the following advantages:
1) the water replenishing control method is used for quantitatively replenishing water by utilizing the accumulated water consumption, and can achieve the ideal effect of replenishing the same amount of water after a certain amount of water is used, so that the overflow phenomenon caused by dirt of a liquid level sensor in the traditional liquid level control system is avoided in principle.
2) After the bidirectional flow sensor in the water supplementing control method is used for a period of time, the calibration coefficient between the signal of the bidirectional flow sensor and the actual flow is possibly changed due to dirt and the like, but the automatic water supplementing amount and the water consumption of the system are approximately equal to the calibration coefficient of the bidirectional flow sensor in a short time, namely the water supplementing amount is always equal to the water consumption in a matched mode, so that the control precision is not influenced no matter whether the flow area in a pipeline is changed or not, and the leakage-free effect is ensured.
3) The water replenishing control method does not depend on a liquid level sensor, can realize non-leakage water replenishing of the solar water heater only through signals of the bidirectional flow sensor and the temperature sensor which are arranged indoors, and is low in control cost but high in reliability.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The utility model provides a solar water heater non-overflow formula automatic water supply control system which characterized in that includes: the system comprises a hot water pipeline, a cold water pipeline, a water supplementing pipeline, a temperature sensor, a flow sensor, a water supplementing valve, a water supplementing controller and a relay;
one end of the hot water pipeline is connected with a water tank of the water heater, and the other end of the hot water pipeline is connected with a user load; the cold water pipeline is connected with the hot water pipeline through the water replenishing pipeline; the temperature sensor and the flow sensor are both arranged on the hot water pipeline, and are both positioned between the hot water pipeline and a pipeline connecting point; the pipeline connecting point is a connecting point of the hot water pipeline and the water replenishing pipeline; the water replenishing valve is arranged on the water replenishing pipeline; the water replenishing control valve is respectively connected with the temperature sensor, the flow sensor and the relay; the relay is connected with the water replenishing valve; the water replenishing controller is used for acquiring the temperature acquired by the temperature sensor and the flow acquired by the flow sensor and controlling the opening and closing of the water replenishing valve through the relay.
2. The non-overflow automatic water supply control system of the solar water heater according to claim 1, wherein the flow sensor is a bidirectional electromagnetic sensor.
3. The non-overflow automatic water supply control system of the solar water heater according to claim 1, wherein the flow sensor is a bidirectional inner and outer pipe differential pressure sensor.
4. A non-overflow automatic water supply control method for a solar water heater, wherein the method is used for the non-overflow automatic water supply control system for the solar water heater according to any one of claims 1 to 3, and the method comprises the following steps:
determining the state of the water heater at the current sampling time; the water heater state comprises a water using state and a water supplementing state; in the water using state, the relay is in a low level state, and the water supplementing valve is in a disconnected state; under the water replenishing state, the relay is in a high level state, and the water replenishing valve is in a disconnected state;
acquiring the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time;
calculating the current accumulated water consumption according to the state of the water heater at the current sampling time, the current flow and the current sampling time;
judging whether the current accumulated water consumption meets water supplementing conditions or not; the water supplementing condition is that the current accumulated water consumption is greater than or equal to a water amount upper limit set value, or the current temperature is within water supplementing set time;
if the current accumulated water consumption does not meet the water supplementing condition, judging whether the current accumulated water consumption is less than or equal to a water lower limit set value;
if the current accumulated water consumption is less than or equal to the water quantity lower limit set value, updating the current sampling time, adjusting the state of the water heater at the current sampling time to be a water consumption state, and returning to the acquisition of the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time;
if the current accumulated water consumption is larger than the lower limit set value of the water quantity, updating the current sampling time, keeping the state of the water heater at the current sampling time, and returning to the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time;
if the current accumulated water consumption meets the water supplementing condition, judging whether the current temperature is less than or equal to a set temperature;
if the current temperature is less than or equal to the set temperature, updating the current sampling time, adjusting the state of the water heater at the current sampling time to be a water supplementing state, and returning to the acquisition of the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time;
and if the current temperature is higher than the set temperature, updating the current sampling time, adjusting the state of the water heater at the current sampling time to be a water using state, and returning to the acquisition of the current temperature acquired by the temperature sensor and the current flow acquired by the flow sensor at the current sampling time.
5. The non-overflow automatic water supply control method of the solar water heater according to claim 4, wherein the current flow rate is as follows:
wherein, q (T) is the current flow rate at the current sampling time T, D is the pipe inner diameter of the hot water pipe, B is the magnetic induction of the externally applied magnetic field, and f (T) is the electrical signal acquired by the flow sensor at the current sampling time T.
6. The non-overflow automatic water supply control method of the solar water heater according to claim 4, wherein the current flow rate is as follows:
ρ(t)＝2×10-5t3-6×10-3t2+2×10-2t+1000(kg/m3)，
wherein, q (T) is the current flow at the current sampling time T, K is a flow coefficient, f (T) is an electrical signal acquired by the flow sensor at the current sampling time T, ρ (T) is the relationship between the density and temperature of the water flow in the hot water pipe, and T is the temperature of the water flow in the hot water pipe.
7. The non-overflow automatic water supply control method of the solar water heater according to claim 4, wherein the calculation of the current accumulated water consumption according to the state of the water heater at the current sampling time, the current flow rate and the current sampling time specifically comprises:
Vt(T)＝Vt(T-ΔT)+Q(T)ΔTflag，
wherein, Vt(T) is the current cumulative water consumption at the current sampling time T, Vt(T- Δ T) is the cumulative water usage at the last sampling time, Δ T is the samplingAnd the time interval Q (T) is the current flow at the current sampling time T, and the flag is the water heater state, is 1 when the water heater state is the water using state, and is-1 when the water heater state is the water supplementing state.
8. The non-overflow automatic water replenishing control method of the solar water heater according to claim 4, wherein the water replenishing set time is between four and a half to five hours in the morning.
9. The non-overflow automatic water supply control method of the solar water heater according to claim 4, characterized in that the upper limit of the water amount is 80-100% of the total capacity of the water tank of the water heater; the lower limit set value of the water quantity is 0-10% of the total capacity of the water tank of the water heater.
10. The non-overflow automatic water supply control method for the solar water heater according to claim 4, wherein the set temperature is 20-25 ℃.
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