CN110017612B - Constant temperature control method of gas water heater - Google Patents
Constant temperature control method of gas water heater Download PDFInfo
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- CN110017612B CN110017612B CN201910181714.XA CN201910181714A CN110017612B CN 110017612 B CN110017612 B CN 110017612B CN 201910181714 A CN201910181714 A CN 201910181714A CN 110017612 B CN110017612 B CN 110017612B
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- 230000001276 controlling effect Effects 0.000 claims description 18
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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Abstract
The invention discloses a constant temperature control method of a gas water heater, which comprises the following steps: in the normal operation process of the gas water heater, after the water inlet pipe stops feeding water, the gas water heater is restarted; detecting the water flow of the water inlet pipe, and collecting the water outlet temperature of the water outlet pipe; and respectively comparing the obtained water flow and the minimum starting water flow of the water inlet pipe, the collected water outlet temperature of the water outlet pipe and a preset target temperature, and controlling the first valve body and the second valve body to act according to a comparison result so as to keep the water flowing out of the water outlet pipe in a constant temperature state. The method is simple and feasible, and can effectively solve the problem of overlarge water temperature fluctuation in the use process of the water heater.
Description
Technical Field
The invention relates to the technical field of kitchen electricity, in particular to a constant temperature control method of a gas water heater.
Background
In the related art, most of gas water heaters (except for circulating system models) need a period of time to reach the previous bath temperature after a water valve is closed and a water valve is restarted again in the use process, so that the bath comfort of users is influenced.
Whether the water heater is constant in temperature or not is always the most critical factor for measuring the excellent performance of the water heater, and the constant temperature performance is the most direct experience for the use comfort of users. The constant temperature performance of the existing gas water heater is mainly guaranteed by two aspects: firstly, a constant temperature algorithm of the water heater is used for matching an optimal heat load interval by calculating the temperature difference of inlet water and outlet water and monitoring the water flow, so that the outlet water temperature is consistent with the set temperature expected by a user; and secondly, a bypass pipeline is directly arranged at the water outlet end of the heat exchange system and the water path, and the requirement that the water using end reaches the set temperature is met through mixing cold water and hot water.
The constant temperature algorithm of the water heater only adjusts the load by controlling in the using process of a user, but the control effect on frequent water cut-off and temperature fluctuation of boiled water in the using process of the user is not obvious, so that the use comfort of the user is greatly influenced within a period of time when the water is cut off and the boiled water is boiled; in addition, the bypass pipeline compensation compensates the temperature difference between the cold water and the hot water, but the problem of overlarge fluctuation of the water cut-off temperature cannot be solved well.
The bypass pipe can compensate the temperature to a certain extent to reduce the problem of overlarge temperature fluctuation of the water heater when water is cut off or supplied, but the effect of controlling the premixed water quantity is not ideal.
Disclosure of Invention
The invention aims to solve at least one of the problems in the prior related art to a certain extent, and therefore, the invention provides a constant temperature control method of a gas water heater, which is simple and can effectively solve the problem of overlarge water temperature fluctuation in the use process of the water heater.
The above purpose is realized by the following technical scheme:
a thermostatic control method of a gas water heater comprises a heat exchange system, a water inlet pipe and a water outlet pipe, wherein the heat exchange system is respectively connected with the water inlet pipe and the water outlet pipe, a bypass pipe is arranged between the water inlet pipe and the water outlet pipe to communicate a water inlet of the water inlet pipe with a water outlet of the water outlet pipe, a first valve body is arranged on the water inlet pipe and used for detecting and adjusting water flow of the water inlet pipe, a second valve body is arranged on the bypass pipe and used for detecting and adjusting water flow of the bypass pipe, and the thermostatic control method comprises the following steps:
in the normal operation process of the gas water heater, when the water inlet pipe stops feeding water and a period of time is set, restarting the gas water heater;
detecting the water flow of the water inlet pipe, and collecting the water outlet temperature of the water outlet pipe;
and respectively comparing the obtained water flow and the minimum starting water flow of the water inlet pipe, the collected water outlet temperature of the water outlet pipe and a preset target temperature, and controlling the first valve body and the second valve body to act according to a comparison result so as to keep the water flowing out of the water outlet pipe in a constant temperature state.
In some embodiments, the valve opening of the second valve body is controlled according to the water flow of the bypass pipe if the water flow of the inlet pipe is less than the minimum start-up water flow.
In some embodiments, the collected outlet water temperature of the outlet pipe and the preset target temperature are according to the formula: comparing | T1-T2| less than or equal to ζ, wherein T1 is the outlet water temperature of the water outlet pipe, T2 is the preset target temperature, and ζ is the tolerance of the deviation value;
if the absolute value of T1-T2 is less than or equal to zeta, controlling the second valve body to keep the current valve opening and simultaneously opening the first valve body, and controlling the ignition operation of the gas water heater;
and if the | T1-T2| is larger than ζ, continuously adjusting the valve opening of the second valve body.
In some embodiments, the zeta value ranges from 0.5 ℃ to 5 ℃.
In some embodiments, after the gas water heater is operated by ignition, the actual ignition operation time is compared with the initial preset time, and the first valve body and the second valve body are controlled to act according to the comparison result.
In some embodiments, the actual ignition operation time and the initial preset time are expressed by the formula: comparing t1-t with 0, wherein t1 is the actual ignition running time, and t is the initial preset time;
if t1-t is equal to 0, closing the valve of the second valve body and controlling the valve of the first valve body to keep an open state;
and if t1-t is not equal to 0, controlling the first valve body and the second valve body to keep the current valve opening.
In some embodiments, after the gas water heater is ignited to operate, whether the water flow of the first valve body is equal to 0 or not is judged, and if the water flow of the first valve body is equal to 0, the gas water heater is started again after the water inlet pipe stops feeding water;
if the water flow of the first valve body is not equal to 0, the valve of the second valve body is continuously closed and the valve of the first valve body is controlled to keep an open state.
In some embodiments, the gas water heater further comprises a control system, the first valve body comprises a first water flow signal module and a first water regulation control module, the control system is in signal connection with the first water flow signal module and the first water regulation control module respectively, the first water flow signal module outputs a pulse frequency to the control system, and the control system controls the first water regulation control module to work according to the fed back pulse frequency so as to regulate the water flow of the water inlet pipe;
the second valve body comprises a second water flow signal module and a second water regulation control module, the control system is in signal connection with the second water flow signal module and the second water regulation control module respectively, the second water flow signal module outputs pulse frequency to the control system, and the control system controls the second water regulation control module to work according to the fed-back pulse frequency so as to regulate the water flow of the bypass pipe.
In some embodiments, the pulse frequency and the water flow rate are linearly proportional, in particular: and f is k and Q, wherein f is frequency, k is a coefficient, and Q is a water flow value.
In some embodiments, the gas water heater further comprises a first temperature sensor disposed on the inlet pipe and a second temperature sensor disposed on the outlet pipe.
Compared with the prior art, the invention at least has the following effects:
1. the constant temperature control method of the gas water heater is simple and feasible, can effectively solve the problem of overlarge water temperature fluctuation in the use process of the water heater, and further improves the use experience of users.
2. The load of the initial work of the gas water heater is reduced, and the energy-saving purpose is further achieved.
3. The noise generated in the initial working section of the ignition operation of the gas water heater can be effectively reduced.
Other advantageous results of the present invention will be described in the detailed description with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic flow chart of a control method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a gas water heater in an embodiment of the invention;
FIG. 3 is a schematic diagram of the pulse frequency versus water flow rate in an embodiment of the present invention;
FIG. 4 is a schematic diagram of the relationship between the number of steps of the motor and the water flow rate in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The first embodiment is as follows: as shown in fig. 1 to 4, the present embodiment provides a thermostatic control method for a gas water heater, where the gas water heater includes a heat exchange system 1, a water inlet pipe 2 and a water outlet pipe 3, the heat exchange system 1 is connected to the water inlet pipe 2 and the water outlet pipe 3 respectively, a bypass pipe 4 is disposed between the water inlet pipe 2 and the water outlet pipe 3 to communicate a water inlet of the water inlet pipe 2 with a water outlet of the water outlet pipe 3, a first valve body 21 is disposed on the water inlet pipe 2, the first valve body 21 is used to detect and adjust water flow of the water inlet pipe 2, a second valve body 41 is disposed on the bypass pipe 4, and the second valve body 41 is used to detect and adjust.
The gas water heater of the embodiment has a simple and compact structure, and can effectively solve the problem that the water temperature fluctuation generated when the gas water heater is restarted after the water supply of the middle section is stopped when a user bathes is overlarge. In addition, the user experience is further improved, and the product is more market competitive.
The gas water heater further comprises a control system, the first valve body comprises a first water flow signal module and a first water transfer control module, the control system is in signal connection with the first water flow signal module and the first water transfer control module respectively, the first water flow signal module outputs pulse frequency to the control system, and the control system controls the first water transfer control module to work according to the fed-back pulse frequency so as to adjust the water flow of the water inlet pipe;
the second valve body comprises a second water flow signal module and a second water-adjusting control module, the control system is in signal connection with the second water flow signal module and the second water-adjusting control module respectively, the second water flow signal module outputs pulse frequency to the control system, and the control system controls the second water-adjusting control module to work according to the fed-back pulse frequency so as to adjust the water flow of the bypass pipe.
Specifically, gas heater still includes first temperature sensor and second temperature sensor, and first temperature sensor sets up on the inlet tube, and second temperature sensor sets up on the outlet pipe, and its simple structure can accurate temperature in the gas heater that detects.
In this embodiment, the gas water heater mainly comprises a heat exchange system 1, a water inlet pipe 2 and a water outlet pipe 3, wherein the water inlet pipe 2 is a main pipe of a water inlet end of the gas water heater, the water outlet pipe 3 is a main pipe of a water outlet end of the gas water heater, a bypass pipe 4 is arranged between the water inlet pipe 2 and the water outlet pipe 3 to communicate a water inlet of the water inlet pipe 2 with a water outlet of the water outlet pipe 3, the bypass pipe 4 can be used as a branch of the water inlet end, a first valve body 21 is installed on the water inlet pipe 2, a second valve body 41 is installed on the bypass pipe 4, a one-way valve 5 is arranged between the second valve body 41 and the water outlet pipe 3, the conduction direction of the one-way valve 5 is that the water inlet end of the bypass pipe 4 leads to the water outlet end of the water outlet pipe 3, external cold water enters, of course, the water can also flow out through the water outlet pipe 3 after passing through the water inlet pipe 2 and the bypass pipe 4 respectively. The first valve body 21 of the present embodiment may be provided with a temperature sensor for detecting the temperature value of the inlet water to predict the constant temperature, and the second valve body 41 may not be provided with a temperature sensor, but is not limited to the above arrangement, and may also be provided with a temperature sensor according to the actual situation.
In this embodiment, the gas water heater further includes a control system, the first valve body 21 is mainly composed of a first water flow signal module and a first water-adjusting control module, the control system is respectively connected with the first water flow signal module and the first water-adjusting control module through signals, wherein the first water-adjusting control module has a first valve and a first motor, a hall element in the first water flow signal module senses the rotating frequency of the water flow rotor and outputs a pulse frequency to the control system, the control system controls the first motor to work according to the fed-back pulse frequency, the first water-adjusting control module controls the opening degree of the first valve through the step number of the first motor, and further, the water flow size of the water inlet pipe 2 is automatically adjusted. The first motor of the present embodiment is preferably a stepping motor, but is not limited to a stepping motor, and other more suitable motors can be selected according to actual needs,
the second valve body 41 of this embodiment is mainly composed of a second water flow signal module and a second water-adjusting control module, the control system is respectively connected to the second water flow signal module and the second water-adjusting control module through signals, wherein the first water-adjusting control module has a second valve and a second motor, a hall element in the second water flow signal module senses the rotation frequency of the water flow rotor and outputs a pulse frequency to the control system, the control system controls the second motor to work according to the fed-back pulse frequency, and the second water-adjusting control module controls the opening degree of the second valve through the step number of the second motor, thereby automatically adjusting the water flow of the bypass pipe 4. The second motor of this embodiment is preferably a stepping motor, but is not limited to a stepping motor, and other more suitable motors may be selected according to actual needs.
As shown in fig. 3, the pulse frequency and the water flow rate are in a linear proportional relationship, specifically: and f is k and Q, wherein f is frequency, k is a coefficient, and Q is a water flow value.
As shown in fig. 4, the water flow regulating module regulates the valve opening of the valve body by the motor step number, so as to regulate the water flow of the pipeline, and the corresponding relationship between the motor step number and the water flow is as shown in fig. 3, wherein when the water regulating valve is at the maximum step number of the motor, the valve of the valve body is in a closed state, that is, the water flow is 0.
Example two: as shown in fig. 1, fig. 3 and fig. 4, the present embodiment provides a thermostatic control method applied to the gas water heater, where the thermostatic control method specifically includes the following steps:
and S101, in the normal operation process of the gas water heater, when the water inlet pipe stops feeding water and a period of time is set, restarting the gas water heater.
In this embodiment, the user closes the gas heater after taking a bath for the first time and stops supplying water temporarily, when needing to continue taking a bath after interval a period, restarts the gas heater and carries out work, and in the same way, first valve body is set for in the biggest step number state that is close to first motor so that first valve body is closed.
And S102, detecting the water flow of the water inlet pipe and collecting the water outlet temperature of the water outlet pipe.
And S103, comparing the obtained water flow of the water inlet pipe with the minimum starting water flow, controlling the first valve body and the second valve body to act according to the comparison result, and controlling the valve opening degree of the second valve body according to the water flow of the bypass pipe if the water flow of the water inlet pipe is smaller than the minimum starting water flow.
In this embodiment, when the water flow of the water inlet pipe is smaller than the minimum starting water flow, the gas water heater does not need to perform ignition operation at this time, the second valve body feeds back the water flow of the bypass pipe to the control system, the control system controls the second motor to work according to the fed-back pulse frequency, and the second water regulation control module controls the valve opening of the second valve body 41 through the step number of the second motor, so as to adjust the water flow of the bypass pipe 4. The judgement condition of the gas heater operation ignition itself of this embodiment is normal start-up ignition process when water flow signal module detects the discharge of inlet tube and is greater than minimum start-up discharge, and gas heater is in normal use in-process, when opening rivers, to begin the heating in real time, only when the discharge of inlet tube is greater than minimum start-up discharge, just can start gas heater and carry out work. If the water flow of the water inlet pipe is smaller than the minimum starting water flow requirement, no starting signal is required, and if the water flow of the water inlet pipe is larger than the minimum starting water flow, the water path of the water inlet pipe is not closed, namely, the water path is not a necessary condition for restarting the gas water heater in the constant temperature control method.
Step S104, the collected outlet water temperature of the outlet pipe and the preset target temperature are calculated according to the formula: comparing | T1-T2| less than or equal to ζ, wherein T1 is the outlet water temperature of the water outlet pipe, T2 is the preset target temperature, and ζ is the tolerance of the deviation value;
if the absolute value of T1-T2 is less than or equal to zeta, controlling the second valve body to keep the current valve opening and simultaneously opening the first valve body to control the ignition operation of the gas water heater;
and if the | T1-T2| is larger than ζ, continuously adjusting the valve opening degree of the second valve body.
In this embodiment, the collected outlet water temperature of the outlet pipe and the preset target temperature are according to the formula: and comparing | T1-T2| ≦ ζ, using the wave action of the temperature difference value of the two within the tolerance of the deviation value as a judgment criterion for judging the valve opening degree and the valve opening time of the second valve body, and if | T1-T2| ≦ ζ, controlling the second valve body to keep the current valve opening degree and giving a pulse signal to control the first valve body to open the valve according to the rated pulse signal. Zeta of this embodiment is an offset tolerance, and zeta can be set to an arbitrary value, and its value range is 0.5 ℃ -5 ℃, and different values are set according to different actual requirements, and 1.5 ℃ can be preferred.
Step S105, after the gas water heater is ignited to operate, the actual ignition operation time and the initial preset time are determined according to the formula: comparing t1-t with 0, wherein t1 is the actual ignition running time, and t is the initial preset time;
if t1-t is equal to 0, the second valve body is restored to the maximum step number state to close the valve and control the first valve body to return to the normal water quantity curve to keep the open state, and external cold water enters the heat exchange system through the water inlet pipe to be heated and then flows out through the water outlet pipe;
and if t1-t is not equal to 0, controlling the first valve body and the second valve body to keep the current valve opening degree to continue running and working.
Step S105, after the gas water heater is ignited to operate, judging whether the water flow of the first valve body is equal to 0, if the water flow of the first valve body is equal to 0, starting the gas water heater again after the water inlet pipe stops feeding water, and operating in a circulating mode;
if the water flow of the first valve body is not equal to 0, the valve of the second valve body is continuously closed and the valve of the first valve body is controlled to keep an open state.
The temperature change process of the gas water heater water cut-off restart process of the embodiment specifically comprises the following steps: assuming that the water flow temperature of the water path of the water inlet pipe is T1, the water flow is V1, the terminal outlet water temperature is T, the water flow temperature of the water path of the bypass pipe is T2, the water flow of the water path of the bypass pipe is V2, psi is a compensation coefficient, and the terminal average water temperature is: t ψ (T1V 1+ T2V 2)/(V1+ V2).
After the gas water heater is started to operate, the gas water heater enables the gas water heater to work under a proper load according to a water flow value and a water inlet temperature, the first valve body is normally opened in a normal bathing state, and the opening state of the valve is adjusted according to a required water flow curve; the second valve body is set in a maximum step number state of the second motor to close the bypass water path.
Initial working state of the gas water heater: the water path of the water inlet pipe and the water path of the bypass pipe can be set to be opened simultaneously, and compared with a single-valve working mode, under the condition of a certain water inflow, the water flow under a rated load is in an inverse proportion relation with a temperature rise value; in the double-valve mode, the gas water heater can work in a smaller load section under the condition of meeting a certain water outlet flow, the step number of the first motor is increased, the step number of the second motor is reduced, the valve opening of the second valve body is adjusted according to the comparison result of the collected water outlet temperature of the water outlet pipe and the preset target temperature, the constant temperature requirement of the gas water heater can be met by correspondingly adjusting according to the temperature change process of the water stop and restart process, and then the control is carried out according to the working state of the single valve.
The gas water heater of this embodiment can effectively solve the too big problem of temperature fluctuation that appears in the use through having used foretell constant temperature control method, has further promoted user's use and has experienced, also reduces the work load under the initial condition to a certain extent simultaneously, reaches energy-conserving purpose, and then reduces the machine noise that produces when gas water heater initial operation.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A thermostatic control method of a gas water heater, the gas water heater comprises a heat exchange system, a water inlet pipe and a water outlet pipe, the heat exchange system is respectively connected with the water inlet pipe and the water outlet pipe, a bypass pipe is arranged between the water inlet pipe and the water outlet pipe to communicate a water inlet of the water inlet pipe with a water outlet of the water outlet pipe, the water inlet pipe is provided with a first valve body on a water inlet end close to the gas water heater, the first valve body is used for detecting and adjusting water flow of the water inlet pipe, a second valve body is arranged on the bypass pipe, and the second valve body is used for detecting and adjusting water flow of the bypass pipe, and the thermostatic control method is characterized by comprising the following steps:
in the normal operation process of the gas water heater, when the water inlet pipe stops feeding water and a period of time is set, restarting the gas water heater;
detecting the water flow of the water inlet pipe, and collecting the water outlet temperature of the water outlet pipe;
comparing the obtained water flow of the water inlet pipe with the minimum starting water flow, and controlling the second valve body to act according to the comparison result so as to enable the water flow of the water inlet pipe to be larger than the minimum starting water flow;
comparing the collected outlet water temperature of the outlet pipe with a preset target temperature, and controlling the first valve body and the second valve body to act according to the comparison result so as to ignite and burn the gas water heater;
after the gas water heater is ignited to run, actual ignition running time is compared with initial preset time, and the first valve body and the second valve body are controlled to act according to a comparison result so that water flowing out of the gas water heater through the water outlet pipe can be kept in a constant temperature state.
2. The thermostatic control method for the gas water heater according to claim 1, wherein if the water flow rate of the water inlet pipe is less than the minimum starting water flow rate, the valve opening degree of the second valve body is controlled according to the water flow rate of the bypass pipe.
3. The thermostatic control method of a gas water heater according to claim 2, characterized in that the collected outlet water temperature of the outlet pipe and the preset target temperature are according to the formula: comparing | T1-T2| less than or equal to ζ, wherein T1 is the outlet water temperature of the water outlet pipe, T2 is the preset target temperature, and ζ is the tolerance of the deviation value;
if the absolute value of T1-T2 is less than or equal to zeta, controlling the second valve body to keep the current valve opening and simultaneously opening the first valve body, and controlling the ignition operation of the gas water heater;
and if the | T1-T2| is larger than ζ, continuously adjusting the valve opening of the second valve body.
4. The thermostatic control method of a gas water heater as claimed in claim 3, wherein the value range of ζ is 0.5 ℃ -5 ℃.
5. The thermostatic control method of a gas water heater according to claim 1, characterized in that the actual ignition running time and the initial preset time are according to the formula: t1-t =0, where t1 is the actual ignition running time and t is the initial preset time;
if t1-t is equal to 0, closing the valve of the second valve body and controlling the valve of the first valve body to keep an open state;
and if t1-t is not equal to 0, controlling the first valve body and the second valve body to keep the current valve opening.
6. The constant temperature control method of the gas water heater according to claim 5, wherein after the gas water heater is ignited to operate, whether the water flow of the first valve body is equal to 0 or not is judged, and if the water flow of the first valve body is equal to 0, the gas water heater is restarted after the water inlet pipe stops feeding water;
if the water flow of the first valve body is not equal to 0, the valve of the second valve body is continuously closed and the valve of the first valve body is controlled to keep an open state.
7. The thermostatic control method of a gas water heater according to claim 1, wherein the gas water heater further comprises a control system, the first valve body comprises a first water flow signal module and a first water regulating control module, the control system is in signal connection with the first water flow signal module and the first water regulating control module respectively, the first water flow signal module outputs pulse frequency to the control system, and the control system controls the first water regulating control module to work according to the fed back pulse frequency to regulate the water flow of the water inlet pipe;
the second valve body comprises a second water flow signal module and a second water regulation control module, the control system is in signal connection with the second water flow signal module and the second water regulation control module respectively, the second water flow signal module outputs pulse frequency to the control system, and the control system controls the second water regulation control module to work according to the fed-back pulse frequency so as to regulate the water flow of the bypass pipe.
8. The thermostatic control method of a gas water heater according to claim 7, wherein the pulse frequency and the water flow rate are in a linear proportional relationship, specifically: f = k × Q, where f is the frequency, k is the coefficient, and Q is the water flow value.
9. The thermostatic control method of a gas water heater as claimed in claim 1, further comprising a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is disposed on the water inlet pipe, and the second temperature sensor is disposed on the water outlet pipe.
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