A gas water heater start-up resonance control method and device and a gas water heater

Abstract

This invention relates to the field of gas water heater technology, disclosing a method, device, and gas water heater for controlling resonance during startup. The basic principle is as follows: when the gas water heater is started, it first preheats for a period of time at the ignition gas consumption level, performing a first stage of preheating; after the first stage of preheating, the heat load of the gas water heater is increased for another period of preheating, performing a second stage of preheating. During startup, the gas water heater preheats under two different loads, which ensures effective ignition and provides initial preheating, allowing the interior of the gas water heater to transition from a cold to a hot state, thus avoiding resonance caused by rapid load changes after ignition from a cold state. Furthermore, since the entire control process only controls the highest heat load for a period before startup, it does not require adjusting the gas supply rate during startup and does not affect other water heating performance characteristics of the gas water heater.

Description

Technical Field

[0001] This invention relates to the field of gas water heater technology, and in particular to a gas water heater start-up resonance control method, device and gas water heater. Background Technology

[0002] A gas water heater is a device that uses gas as fuel, releasing a large amount of heat energy through combustion to heat cold water into hot water within a certain time. Gas water heaters have been developed over many years and offer advantages such as easy installation, good safety, and rapid heating of cold water, making them convenient for people's production and daily life. They are widely used in bathrooms, kitchens, and other scenarios requiring hot water.

[0003] The inventors have discovered that gas water heaters are prone to resonance upon startup. The analysis suggests this is due to the rapid increase in load causing resonance. To avoid or reduce startup resonance, the gas filling rate needs to be slowed down, allowing the machine time to adapt and reducing the likelihood of resonance. However, slowing down the gas filling rate leads to water temperature overshoot, affecting hot water stability and reducing the overall unit's response efficiency to changes in water flow. In particular, with significant water flow variations, water temperature fluctuations are extreme, even exceeding national standards for temperature overshoot and hot water stabilization time. Therefore, the startup resonance problem caused by excessive load cannot be completely resolved. Summary of the Invention

[0004] The purpose of this invention is to provide a method to avoid the start-up resonance problem caused by high load through combustion preheating, and to provide at least one beneficial option or create conditions for solving one or more technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A method for preventing resonance during the start-up of a gas water heater is based on the principle that when the gas water heater is turned on, it first preheats for a period of time under the ignition gas consumption state to perform the first stage of preheating; after the first stage of preheating, the heat load of the gas water heater is increased to perform the second stage of preheating.

[0007] The first preheating stage lasts for 1-5 seconds; the second preheating stage lasts for 5 seconds to 1 minute. The heat load for the second preheating stage is determined by a set threshold and the calculated actual heat load. When the calculated actual heat load is less than or equal to the set threshold, the calculated actual heat load is used as the heat load for the second preheating stage. When the calculated actual heat load is greater than the set threshold, the set threshold is used as the heat load for the second preheating stage.

[0008] More preferably, the set threshold is 60-95% of the rated heat load of the gas water heater.

[0009] More preferably, the required heat load is calculated based on the current water flow rate Q, the inlet water temperature T1, and the set outlet water temperature T2 of the water heater.

[0010] More preferably, a self-test is performed before the gas water heater is ignited. If a fault is detected, an alarm is issued and the corresponding fault code is displayed; if there is no fault, the ignition needle ignites, the proportional valve is adjusted to the ignition gas volume opening, and the main proportional valve is opened.

[0011] On the other hand, the present invention provides a gas water heater control device, which includes an acquisition module, a calculation module, a judgment module, a storage module, an execution module, and an ignition start module; the acquisition module is used to acquire water flow rate Q, inlet water temperature T1, and set outlet water temperature T2; the calculation module receives the signal from the acquisition module and is used to calculate the heat load W1 required to reach the set temperature T2 based on the water flow rate Q, inlet water temperature T1, and set outlet water temperature T2; the judgment module receives the signals from the calculation module and the storage module and is used to compare and judge the heat load W1 with the set threshold, and output the corresponding combustion load based on the comparison and judgment result; the storage module is used to store the ignition preheating load, ignition preheating duration, set threshold, and second preheating duration; the execution module receives the signals from the judgment module, the storage module, and the ignition start module and is used to retrieve the operating parameters in the storage module to control the gas water heater based on the signals from the ignition start module and the judgment module.

[0012] More preferably, the gas water heater control device further includes a parameter input module for inputting ignition preheating load, ignition preheating duration, set threshold, and second-stage preheating duration.

[0013] More preferably, the ignition start module includes a self-test module and an early warning module. The self-test module is used to determine whether the gas water heater is faulty. If a fault is detected, the early warning module will issue an alarm and display the corresponding fault code. If there is no fault, the module will send a start ignition signal to the execution module.

[0014] On the other hand, the present invention also provides a gas water heater having a gas water heater control device as described above.

[0015] The present invention, by employing the above technical solution, has at least the following beneficial effects.

[0016] 1. When the gas water heater is turned on, it preheats under two different loads. On the one hand, this ensures the flame transmission effect, and on the other hand, it preheats the gas water heater, allowing the interior of the gas water heater to transition from a cold state to a hot state. This avoids resonance caused by rapid load changes after the gas water heater is ignited in a cold state.

[0017] Second, after low-load preheating, the heat inside the combustion chamber rises rapidly to the set threshold or the actual required heat load and is maintained for a period of time to ensure that the gas water heater is fully preheated under high load conditions. Especially when performing the second stage of preheating under the set threshold, the working state is adjusted to be close to the state required for the maximum heat load, which can effectively avoid resonance caused by rapid changes in heat load.

[0018] Third, since the entire control process only controls the highest heat load for a period of time before startup, there is no need to adjust the gas filling speed at startup, and it does not affect other hot water performance of the gas water heater. Attached Figure Description

[0019] Figure 1 The diagram shows a flowchart of the gas water heater start-up resonance control method provided by the present invention.

[0020] Figure 2 The diagram shown is a structural schematic of the gas water heater control device provided by the present invention.

[0021] Figure 3 The diagram shown is another structural schematic of the gas water heater control device provided by the present invention.

[0022] Figure 4 The diagram shown is another structural schematic of the gas water heater control device provided by the present invention.

[0023] Explanation of the reference numerals in the attached figures.

[0024] 11: Acquisition module, 12: Calculation module, 13: Judgment module, 14: Storage module, 15: Execution module, 16: Ignition and start-up module, 17: Parameter input module.

[0025] 161: Self-test module; 162: Early warning module. Detailed Implementation

[0026] To facilitate a better understanding of the essence of the present invention by those skilled in the art, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] This invention provides a method for preventing resonance during the start-up of a gas water heater. The basic principle is to provide sufficient combustion preheating time when the gas water heater is started up. It first preheats for a period of time under the ignition gas consumption state, and then preheats for a period of time under the high load state after the load changes rapidly. This solves the problem of start-up resonance caused by high load and fast gas filling speed. It does not require adjusting the start-up gas filling speed and does not affect the stability of hot water performance.

[0028] Reference Figure 1As shown in the figure, this embodiment provides a gas water heater start-up anti-resonance control method, the steps of which are as follows: 1) After starting up, the gas water heater starts self-test. If a fault is detected, an alarm is issued and the corresponding fault code is displayed; if there is no fault, the ignition needle ignites, the proportional valve is adjusted to the ignition gas flow opening, the main valve of the proportional valve is opened, and the feedback needle continues to ignite for 2 seconds after detecting the flame signal; 2) The proportional valve maintains the ignition gas flow opening to preheat the entire water heater; 3) After the first stage of preheating, the main controller adjusts the current water flow Q, the inlet water temperature T1, and the water heater set outlet water temperature T2 according to the current water flow Q, inlet water temperature T1, and water heater set outlet water temperature T2. Once the required heat load W1 is calculated from the data, the opening and closing of the segmented valve and the opening degree of the proportional valve are adjusted; 31) When the calculated heat load W1 is less than or equal to 80% of the rated heat load W, the main controller adjusts the overall heat load to W1 by adjusting the opening degree of the proportional valve and the opening and closing of the segmented valve; 32) When the calculated heat load W1 is greater than 80% of the rated heat load W (set threshold), the main controller adjusts the overall heat load to 0.8W by adjusting the opening degree of the proportional valve and the opening and closing of the segmented valve. After working under this heat load for 30 seconds to complete the second stage of preheating, the load is then adjusted to W1.

[0029] In this embodiment, the main proportional valve is used to control the on / off state of the gas path, the proportional valve is used to adjust the opening degree of the gas path, and the segmented valve is used to adjust the number of combustion burners. Based on the water flow rate Q, the inlet water temperature T1, and the set outlet water temperature T2, the main controller can automatically calculate the heat load W1 required to reach the set temperature T2, thereby controlling the opening degree of the gas proportional valve and the opening and closing of the segmented valve to adjust the heat load.

[0030] Compared to existing technologies, the gas water heater start-up resonance control method provided in this embodiment has the following characteristics: 1) During start-up, the gas water heater preheats under two different loads; in the low-load stage, it maintains preheating for 2 seconds at the ignition gas consumption state, which ensures the flame transfer effect and provides initial preheating to the gas water heater, allowing the interior of the gas water heater to transition from a cold state to a hot state, thus avoiding resonance caused by rapid load changes after the gas water heater ignites in a cold state; 2) After the low-load preheating is completed, the internal heat of the combustion chamber rapidly rises to 80% of the rated heat load and is maintained for 30 seconds, allowing the gas water heater to fully preheat under high load conditions; during the second preheating stage, the operating state is adjusted to be close to the state required for the maximum heat load, effectively avoiding resonance caused by excessively rapid changes in heat load; 3) Since the entire control process only controls the highest heat load in the first 30 seconds before start-up, it is not necessary to adjust the start-up gas supply speed or affect other hot water performance of the gas water heater.

[0031] In some embodiments, during the second stage of preheating, the set threshold can be 70%, 85%, 90% of the rated heat load, etc., which can achieve similar technical effects and is not limited to this embodiment.

[0032] In some embodiments, the duration of the second preheating stage can be adjusted appropriately between 5 seconds and 1 minute, with 30 seconds being the most effective.

[0033] In some embodiments, the second preheating stage can also be divided into several smaller segments, each with a different load, such as two segments, one operating at 0.6W for 15 seconds and then adjusted to 0.8W for 15 seconds, etc.

[0034] In some embodiments, the duration of the first preheating stage can be adjusted appropriately between 2 and 5 seconds.

[0035] To achieve the above control method, the present invention also proposes a gas water heater control device.

[0036] Figure 2 This is a schematic diagram of the structure of a gas water heater control device according to an embodiment of the present invention.

[0037] The gas water heater control device includes an acquisition module 11, a calculation module 12, a judgment module 13, a storage module 14, an execution module 15, and an ignition start module 16. The acquisition module 11 is used to acquire water flow rate Q, inlet water temperature T1, and set outlet water temperature T2. The calculation module 12 receives the signal from the acquisition module 11 and is used to calculate the heat load W1 required to reach the set temperature T2 based on the water flow rate Q, inlet water temperature T1, and set outlet water temperature T2. The judgment module 13 receives the signals from the calculation module 12 and the storage module 14 and is used to compare and judge the heat load W1 with the set threshold, and output the corresponding combustion load based on the comparison and judgment result. The storage module 14 is used to store the ignition preheating load, ignition preheating duration, set threshold, and second-stage preheating duration. The execution module 14 receives the signals from the judgment module 13, the storage module 14, and the ignition start module 16 and is used to retrieve the operating parameters in the storage module 14 to control the gas water heater based on the signals from the ignition start module 15 and the judgment module 13.

[0038] Reference Figure 3 As shown, the above device also includes a parameter input module 17, which is used to input the ignition preheating load, ignition preheating duration, set threshold, and second preheating duration.

[0039] Reference Figure 4 As shown, the ignition start module 16 includes a self-test module 161 and an early warning module 162. The self-test module 161 is used to determine whether the gas water heater is faulty. If a fault is detected, the early warning module 162 will issue an alarm and display the corresponding fault code. If there is no fault, the execution module will send a start ignition signal.

[0040] To implement the above-mentioned control device, the present invention also proposes a gas water heater having the above-mentioned gas water heater control device.

[0041] It should be noted that any process or method described in the flowcharts or otherwise herein in this specification can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which the embodiments of the invention pertain.

[0042] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0043] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0044] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preventing resonance during startup of a gas water heater, characterized in that, When the gas water heater is turned on, it first preheats for a period of time at the ignition gas consumption state to perform the first stage of preheating; after the first stage of preheating, the heat load of the gas water heater is increased to perform the second stage of preheating. The first preheating stage lasts for 1-5 seconds; the second preheating stage lasts for 5 seconds to 1 minute. The heat load for the second preheating stage is determined by a set threshold and the calculated actual heat load. When the calculated actual heat load is less than or equal to the set threshold, the calculated actual heat load is used as the heat load for the second preheating stage. When the calculated actual heat load is greater than the set threshold, the set threshold is used as the heat load for the second preheating stage.

2. The method for preventing resonance during startup of a gas water heater according to claim 1, characterized in that, The set threshold is 60-95% of the rated heat load of the gas water heater.

3. The method for preventing resonance during startup of a gas water heater according to claim 1, characterized in that, The required heat load is calculated based on the current water flow rate Q, the inlet water temperature T1, and the water heater's set outlet water temperature T2.

4. The method for preventing resonance during startup of a gas water heater according to claim 1, characterized in that, Before ignition, the gas water heater performs a self-test. If a fault is detected, an alarm will be issued and the corresponding fault code will be displayed. If there is no fault, the ignition needle will ignite, the proportional valve will be adjusted to the ignition gas volume opening, and the main proportional valve will be opened.

5. A control device for a gas water heater, characterized in that, A gas water heater start-up anti-resonance control method as described in any one of claims 1-4 includes an acquisition module, a calculation module, a judgment module, a storage module, an execution module, and an ignition start-up module. The acquisition module acquires water flow rate Q, inlet water temperature T1, and a set outlet water temperature T2. The calculation module receives signals from the acquisition module and calculates the heat load W1 required to reach the set temperature T2 based on the water flow rate Q, inlet water temperature T1, and set outlet water temperature T2. The judgment module receives signals from the calculation module and the storage module, compares and judges the heat load W1 with a set threshold, and outputs the corresponding combustion load based on the comparison and judgment result. The storage module stores the ignition preheating load, ignition preheating duration, set threshold, and second-stage preheating duration. The execution module receives signals from the judgment module, the storage module, and the ignition start-up module, and retrieves the operating parameters from the storage module to control the gas water heater based on the signals from the ignition start-up module and the judgment module.

6. A gas water heater control device according to claim 5, characterized in that, It also includes a parameter input module, which is used to input ignition preheating load, ignition preheating duration, set threshold, and second-stage preheating duration.

7. A gas water heater control device according to claim 5, characterized in that, The ignition start module includes a self-test module and an early warning module. The self-test module is used to determine whether the gas water heater is faulty. If a fault is detected, the early warning module will issue an alarm and display the corresponding fault code. If there is no fault, the module will send a start ignition signal to the execution module.

8. A gas water heater, characterized in that, A gas water heater control device as described in any one of claims 5-7.

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