Combustion device, water heater, and water heater control method

Abstract

The present invention discloses a combustion device, a water heater, and a control method for the water heater. The combustion device includes a combustion body, the combustion body is provided with a combustion chamber, and a combustion chamber air inlet and a combustion chamber air outlet connected to the combustion chamber; a fan, the fan has a fan air inlet and a fan air outlet, the fan air outlet is connected to the combustion chamber air inlet, and the fan air inlet forms an air flow channel through the fan, the combustion chamber to the combustion chamber air outlet; a wind pressure sensing component, the wind pressure sensing component includes a pressure taking pipe and a wind pressure sensor, the pressure taking pipe includes a pressure taking section, the pressure taking section is provided in the air flow channel and extends in parallel to the air flow direction in the air flow channel, and the wind pressure sensor is connected to the pressure taking section; and a main controller, the main controller is electrically connected to the fan and the wind pressure sensor respectively. The technical solution of the present invention improves the adjustment accuracy of the rotational speed of the fan of the combustion device.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to a combustion device, a water heater using the combustion device, and a control method for the water heater. Background Art

[0002] When a gas water heater is working, it is affected by the external wind pressure resistance, which causes incomplete combustion of the fuel and affects the temperature of the heated water. For this reason, the water heater needs a certain wind resistance to reduce the impact of the external wind pressure resistance on its combustion conditions. The water heaters in the related art basically judge the size of the external wind pressure resistance based on the current change of the fan, so as to adjust the speed of the fan to resist the external wind pressure resistance. However, when the fan itself is in a relatively low speed working state, that is, when its own working current is relatively small, the amplitude of the change of its current due to the influence of the external wind pressure resistance is relatively small, which reduces the accuracy of the detection of the external wind pressure resistance and affects the accuracy of the adjustment of the fan speed.

[0003] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a combustion device, which is applied to a water heater and aims to improve the adjustment accuracy of the rotation speed of the fan of the combustion device.

[0005] To achieve the above-mentioned purpose, the combustion device proposed by the present invention comprises:

[0006] A combustion body, wherein the combustion body is provided with a combustion chamber and a combustion chamber air inlet and a combustion chamber air outlet communicating with the combustion chamber;

[0007] A fan, the fan having a fan inlet and a fan outlet, the fan outlet being connected to the combustion chamber inlet, the fan inlet forming an air flow channel through the fan, the combustion chamber, and the combustion chamber to the combustion chamber outlet;

[0008] a wind pressure sensing assembly, the wind pressure sensing assembly comprising a pressure taking tube and a wind pressure sensor, the pressure taking tube comprising a pressure taking section, the pressure taking section being disposed in the airflow channel and extending parallel to the airflow direction in the airflow channel, the wind pressure sensor being in communication with the pressure taking section; and

[0009] A main controller is electrically connected to the fan and the wind pressure sensor respectively.

[0010] In one embodiment of the present invention, the pressure taking section is provided at the air inlet of the fan, the air outlet of the fan, the air inlet of the combustion chamber, or the air outlet of the combustion chamber.

[0011] In one embodiment of the present invention, the end of the pressure-taking section away from the wind pressure sensor has a pressure-taking end surface, and at least one end of the pressure-taking section close to the pressure-taking end surface is accommodated in the air inlet of the fan.

[0012] In one embodiment of the present invention, the pressure-taking end surface is arranged along the airflow direction facing the air inlet of the fan, the wind pressure sensor has a positive pressure interface, and the end of the pressure-taking section away from the pressure-taking end surface is connected to the positive pressure interface of the wind pressure sensor;

[0013] Alternatively, the pressure taking end face is arranged along the airflow direction away from the fan air inlet, the wind pressure sensor has a negative pressure interface, and the end of the pressure taking section away from the pressure taking end face is connected to the negative pressure interface of the wind pressure sensor.

[0014] In one embodiment of the present invention, the pressure-taking end surface is arranged perpendicular to the extending direction of the pressure-taking section.

[0015] In one embodiment of the present invention, an air inlet duct is protruding from the outer wall of the fan, the air inlet duct is arranged around the outside of the fan air inlet, and is provided with an air inlet channel connected to the fan air inlet, at least one end of the pressure taking section close to the pressure taking end face is inserted into the air inlet channel, and the end of the pressure taking section away from the pressure taking end face is connected to the air inlet duct.

[0016] In one embodiment of the present invention, the pressure taking tube further includes an installation section, which is connected to the air inlet tube, one end of the installation section is connected to the end of the pressure taking section away from the pressure taking end face, and the other end is connected to the wind pressure sensor.

[0017] In one embodiment of the present invention, the installation section and the pressure taking section are arranged at an angle, or are arranged in a straight line;

[0018] And / or, the air inlet duct is provided with a support base, and the mounting section is inserted into the support base;

[0019] And / or, the wind pressure sensing assembly further comprises a hose, one end of which is connected to an end of the installation section away from the pressure taking section, and the other end of which is connected to the wind pressure sensor.

[0020] In one embodiment of the present invention, the main controller is used to obtain the current speed of the fan. When the current speed of the fan is less than the preset speed, the current wind pressure value in the airflow channel is obtained through the wind pressure sensor. The current wind pressure value is compared with the preset wind pressure value to obtain a wind pressure comparison result. According to the wind pressure comparison result, the speed of the fan is adjusted so that the current wind pressure value remains consistent with the preset wind pressure value.

[0021] In one embodiment of the present invention, the combustion device further comprises a current sensor, and the current sensor is electrically connected to the fan and the main controller respectively;

[0022] The combustion device further includes a current sensor, which is electrically connected to the fan and the main controller respectively;

[0023] The main controller is also used to obtain the current current value of the fan through the current sensor, compare the current current value with the preset current value to obtain a current comparison result, and adjust the speed of the fan according to the current comparison result to make the current wind pressure value consistent with the preset wind pressure value.

[0024] In one embodiment of the present invention, the current sensor is disposed in the main controller.

[0025] The present invention also proposes a water heater, which includes a combustion device, which includes a combustion body, and the combustion body is provided with a combustion chamber and a combustion chamber air inlet and a combustion chamber air outlet connected to the combustion chamber; a fan, which has a fan air inlet and a fan air outlet, and the fan air outlet is connected to the combustion chamber air inlet, and the fan air inlet forms an air flow channel through the fan and the combustion chamber to the combustion chamber air outlet; a wind pressure sensing component, which includes a pressure taking pipe and a wind pressure sensor, and the pressure taking pipe includes a pressure taking section, and the pressure taking section is provided in the air flow channel and extends along a direction parallel to the air flow in the air flow channel, and the wind pressure sensor is connected to the pressure taking section; and a main controller, which is electrically connected to the fan and the wind pressure sensor respectively.

[0026] The present invention further provides a control method for a water heater, the water heater including a combustion device, the combustion device including a combustion body, a fan cooperating with the combustion body to form an air flow channel, a wind pressure sensor for detecting the air pressure in the air flow channel, and a current sensor for detecting the operating current of the fan. The control method for the water heater includes the following steps:

[0027] Get the current speed of the fan;

[0028] When the current speed of the fan is less than the preset speed, the current wind pressure value in the air flow channel is obtained through the wind pressure sensor;

[0029] Comparing the current wind pressure value with the preset wind pressure value to obtain a wind pressure comparison result;

[0030] According to the wind pressure comparison result, the fan speed is adjusted so that the current wind pressure value is consistent with the preset wind pressure value;

[0031] When the current speed of the fan is greater than or equal to the preset speed, obtaining the current current value of the fan through the current sensor;

[0032] Comparing the current current value with a preset current value to obtain a current comparison result;

[0033] According to the current comparison result, the rotation speed of the fan is adjusted so that the current current value is consistent with the preset current value.

[0034] The combustion device of the technical solution of the present invention is provided with a wind pressure sensing component in the air flow channel formed by the fan air inlet, the fan, the combustion chamber and the combustion chamber air outlet. The wind pressure sensing component can detect the wind pressure change in the air flow channel. When the current wind pressure value in the air flow channel is less than the preset pressure value, the main controller adjusts the speed of the fan to increase the wind pressure value in the air flow channel to resist the external wind pressure resistance until the wind pressure value in the air flow channel is consistent with the preset pressure value, thereby completing the adjustment of the fan speed of the combustion device when it is subjected to external wind pressure resistance. Since the wind pressure change in the air flow channel is directly detected by the wind pressure sensing component in this solution, compared with the prior art that determines the size of the external wind pressure resistance based on the current change of the fan, the direct detection method of the wind pressure sensing component in this solution still has a large variation range when the fan itself is in a lower speed working state, thereby ensuring the accuracy of the detection of the external wind pressure resistance and improving the adjustment accuracy of the speed of the fan in the combustion device.

[0035] Furthermore, the pressure-sampling section of the pressure-sampling tube of the wind pressure sensing assembly in this embodiment extends parallel to the direction of airflow within the airflow channel. Compared to the prior art, where the wind pressure sensing assembly is installed at an angle to the airflow within the airflow channel and needs to be rotated to a certain angle to achieve a better detection effect, the wind pressure sensing assembly in this embodiment does not need to consider the installation angle and can achieve better detection results, thereby simplifying the installation process of the wind pressure sensing assembly and improving the installation efficiency of the wind pressure sensing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0037] Figure 1 This is a schematic structural diagram of an embodiment of a water heater of the present invention;

[0038] Figure 2This is a schematic structural diagram of an embodiment of a combustion device of the present invention;

[0039] Figure 3 for Figure 2 Schematic diagram of the air flow channel of the combustion device;

[0040] Figure 4 for Figure 2 A cross-sectional schematic diagram of the combustion device;

[0041] Figure 5 for Figure 2 A schematic structural diagram of an embodiment of a fan of a combustion device;

[0042] Figure 6 for Figure 2 A schematic structural diagram of another embodiment of a fan for a combustion device;

[0043] Figure 7 for Figure 2 Schematic diagram of the structure of the wind pressure sensor of the combustion device;

[0044] Figure 8 Flowchart of an embodiment of a water heater control method of the present invention.

[0045] Description of Figure Numbers:

[0046] Label name Label name 1000 water heater 40 Wind pressure sensor component 100 combustion device 41 Pressure pipe 10 Combustion body 411 Pressure section 11 combustion chamber 411a Pressure end face 12 Combustion chamber air inlet 412 Installation section 13 Combustion chamber air outlet 42 Wind pressure sensor 20 fan 421 Positive pressure interface 21 Fan air inlet 422 Negative pressure interface 22 Fan outlet 43 hose 23 Air Inlet 50 main controller 231 Air intake duct 60 burner 232 Support seat 80 heat exchanger 100a airflow channel

[0047] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] Please refer to Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 The present invention provides a combustion device 100, which is applied to a water heater 1000.

[0053] In one embodiment of the present invention, the combustion device 100 includes a combustion body 10, a fan 20, a wind pressure sensing component 40 and a main controller 50; wherein, the combustion body 10 is provided with a combustion chamber 11 and a combustion chamber air inlet 12 and a combustion chamber air outlet 13 connected to the combustion chamber 11; the fan 20 has a fan air inlet 21 and a fan air outlet 22, the fan air outlet 22 is connected to the combustion chamber air inlet 12, the fan air inlet 21 passes through the fan 20 and the combustion chamber 11 to the combustion chamber air outlet 13 to form an air flow channel 100a; the wind pressure sensing component 40 includes a pressure taking pipe 41 and a wind pressure sensor 42, the pressure taking pipe 41 includes a pressure taking section 411, the pressure taking section 411 is provided in the air flow channel 100a, and extends along a direction parallel to the air flow in the air flow channel 100a, the wind pressure sensor 42 is connected to the pressure taking section 411; the main controller 50 is electrically connected to the fan 20 and the wind pressure sensor 42 respectively.

[0054] In one embodiment of the present invention, the combustion body 10 can be a square shell to provide a larger storage space; of course, it can also be a circular shell to reduce the space it occupies, and this application is not limited to this. A combustion chamber 11 is provided in the combustion body 10, which is mainly used to install and accommodate the burner 60, heat exchanger 80 and other components of the water heater 1000. The burner 60 can heat the heat exchanger 80, and the heat exchanger 80 can heat hot water into hot water, thereby completing the heating of cold water by the water heater 1000. The fan 20 is mainly used to provide airflow power to drive the airflow to pass through the fan air inlet 21, the fan air outlet 22, the combustion chamber air inlet 12, the combustion chamber 11, and the combustion chamber air outlet 13 in sequence, ensuring that the airflow has good fluidity. In order to reduce the space occupied by the water heater 1000 and facilitate installation, the fan 20 can be connected to the combustion body 10. The fan 20 and the combustion body 10 can be detachably connected, allowing the fan 20 to be disassembled and repaired if damaged, thereby avoiding the need for complete replacement due to partial damage and reducing maintenance costs. For example, the fan 20 can be connected to the combustion body 10 via screws or snaps. This ensures the stability of the fan 20's installation and simplifies the assembly and disassembly process. Furthermore, the connection of the fan 20 to the combustion body 10 shortens the distance between the fan outlet 22 and the combustion chamber inlet 12, thereby reducing wind pressure loss and ensuring that the airflow entering the combustion chamber 11 has a certain pressure, thereby ensuring the fluidity of the airflow within the combustion chamber 11. The wind pressure sensing assembly 40 is primarily used to detect changes in wind pressure within the airflow channel 100a, determine the magnitude of external wind pressure resistance, and adjust the speed of the fan 20 accordingly to counteract the external wind pressure resistance, thereby ensuring the fluidity of the airflow within the airflow channel 100a and enabling the water heater 1000 to perform normal and stable combustion operations. Specifically, the wind pressure value in the airflow channel 100a when the water heater 1000 is operating in a calm state can be used as the preset wind pressure value. When there is wind pressure resistance in the outside world, the wind pressure value in the airflow channel 100a changes and deviates from the preset wind pressure value. Multiple preset wind pressure values ​​can be provided, and these values ​​correspond to the opening of the gas proportional valve of the water heater 1000. That is, at a certain gas flow rate, the water heater 1000 has a corresponding preset pressure value to ensure the required air flow rate for normal operation of the water heater 1000.

[0055] The combustion device 100 of the technical solution of the present invention is provided with a wind pressure sensing assembly 40 within the airflow channel 100a formed by the fan air inlet 21, through the fan 20, the combustion chamber 11, and the combustion chamber air outlet 13. The wind pressure sensing assembly 40 can detect changes in wind pressure within the airflow channel 100a. When the current wind pressure value within the airflow channel 100a is less than a preset pressure value, the main controller 50 adjusts the speed of the fan 20 to increase the wind pressure value within the airflow channel 100a to resist external wind pressure resistance until the wind pressure value within the airflow channel 100a is consistent with the preset pressure value, thereby completing the adjustment of the speed of the fan 20 when the combustion device 100 is subjected to external wind pressure resistance. Since the wind pressure changes in the air flow channel 100a are directly detected by the wind pressure sensing component 40 in this solution, compared with the prior art of judging the size of the external wind pressure resistance based on the current change of the fan 20, the direct detection method through the wind pressure sensing component 40 in this solution still has a large variation range when the fan 20 itself is in a lower speed working state, thereby ensuring the accuracy of the detection of the external wind pressure resistance and improving the adjustment accuracy of the speed of the fan 20 in the combustion device 100.

[0056] Furthermore, the pressure-sampling section 411 of the pressure-sampling tube 41 of the wind pressure sensing assembly 40 in this embodiment extends parallel to the direction of airflow within the airflow channel 100a. Compared to the prior art, where the wind pressure sensing assembly 40 is installed at an angle to the airflow direction within the airflow channel 100a and needs to be rotated to a certain angle to achieve a better detection effect, the pressure-sampling tube 41 in this embodiment does not need to consider the installation angle and can achieve better detection results, thereby simplifying the installation process of the wind pressure sensing assembly 40 and improving the installation efficiency of the wind pressure sensing assembly 40.

[0057] In one embodiment of the present invention, the pressure-taking section 411 is disposed at the fan air inlet 21 , the fan air outlet 22 , the combustion chamber air inlet 12 , or the combustion chamber air outlet 13 .

[0058] As can be understood, the diameters of the fan inlet 21, fan outlet 22, combustion chamber inlet 12, and combustion chamber outlet 13 are smaller than those of the combustion chamber 11, resulting in greater air mobility within these areas. This creates external wind pressure resistance, leading to greater wind pressure fluctuations within these areas, facilitating detection by the wind pressure sensing assembly 40 and improving the accuracy of wind pressure change detection.

[0059] Please refer to Figure 5 In one embodiment of the present invention, the end of the pressure-taking section 411 away from the wind pressure sensor 42 has a pressure-taking end surface 411 a , and at least one end of the pressure-taking section 411 close to the pressure-taking end surface 411 a is accommodated in the fan air inlet 21 .

[0060] It can be understood that the pressure-taking section 411 is placed at least at one end close to the pressure-taking end surface 411a at the fan inlet 21, so that the end is mainly in contact with the airflow in the fan inlet 21. In this way, it is only affected by the airflow parallel to the direction of the airflow in the fan inlet 21, thereby avoiding the end from being affected by the airflow in other directions of the outside world, and further improving the accuracy of the wind pressure sensing component 40 in detecting wind pressure changes.

[0061] Please refer to Figure 2 、 Figure 3 as well as Figure 7 In one embodiment of the present invention, the pressure-taking end face 411a is arranged along the airflow direction facing the fan air inlet 21, the wind pressure sensor 42 has a positive pressure interface 421, and the end of the pressure-taking section 411 away from the pressure-taking end face 411a is connected to the positive pressure interface 421 of the wind pressure sensor 42; or, the pressure-taking end face 411a is arranged along the airflow direction away from the fan air inlet 21, the wind pressure sensor 42 has a negative pressure interface 422, and the end of the pressure-taking section 411 away from the pressure-taking end face 411a is connected to the negative pressure interface 422 of the wind pressure sensor 42.

[0062] It is understood that because the wind pressure sensor 42 is provided with two interfaces, a positive pressure interface 421 and a negative pressure interface 422, the pressure sampling end surface 411a can be arranged in the direction of the airflow in the fan air inlet 21, or in the direction of the airflow away from the fan air inlet 21. Both arrangements can be connected to one of the two interfaces of the wind pressure sensor 42 to detect the wind pressure in the airflow channel 100a, so that the pressure sampling tube 41 does not need to be positioned in the installation direction, thereby further simplifying the installation process of the wind pressure sensing assembly 40 and improving the installation efficiency of the wind pressure sensing assembly 40.

[0063] In one embodiment of the present invention, the pressure-taking end surface 411 a is perpendicular to the extending direction of the pressure-taking section 411 .

[0064] It can be understood that the pressure-taking end surface 411 a is configured as a flat head, which reduces the complexity of processing the pressure-taking tube 41 , facilitates the production process, and thus improves the production efficiency of the pressure-taking tube 41 .

[0065] Please refer to Figure 2 、 Figure 6 In one embodiment of the present invention, an air inlet duct 23 is protruded from the outer wall of the fan 20, and the air inlet duct 23 is arranged around the outside of the fan air inlet 21, and is provided with an air inlet channel 231 connected to the fan air inlet 21. At least one end of the pressure taking section 411 close to the pressure taking end surface 411a is inserted into the air inlet channel 231, and the end of the pressure taking section 411 away from the pressure taking end surface 411a is connected to the air inlet duct 23.

[0066] It can be understood that the setting of the air inlet 23 has a convergence and guiding effect on the air flow, so that a large amount of air flows into the fan 20 in an orderly manner. At the same time, the setting of the air inlet 23 also facilitates the fixation of the pressure taking pipe 41, so that the pressure taking pipe 41 can be installed nearby the air inlet 23.

[0067] In one embodiment of the present invention, the pressure taking tube 41 further includes an installation section 412, which is connected to the air inlet tube 23, one end of the installation section 412 is connected to the end of the pressure taking section 411 away from the pressure taking end surface 411a, and the other end is connected to the wind pressure sensor 42.

[0068] It can be understood that such an arrangement allows the pressure taking tube 41 to be installed and fixed by setting a connecting structure at the installation section 412, avoiding damage to the surface of the pressure taking tube 41, thereby ensuring normal and stable pressure taking of the pressure taking tube 41.

[0069] In one embodiment of the present invention, the installation section 412 and the pressure taking section 411 are arranged at an angle, or are arranged in a straight line.

[0070] It is understood that the angled arrangement of the mounting section 412 and the pressure-taking section 411 facilitates installation of the pressure-taking tube 41 on the periphery of the air inlet duct 231, thereby further improving the convenience of installing the pressure-taking tube 41. The mounting section 412 and the pressure-taking section 411 can be arranged at an angle of 30°, 60°, 90°, or 120°, which is not limited in this application. The linear arrangement of the mounting section 412 and the pressure-taking section 411 facilitates molding, reduces the molding complexity of the pressure-taking tube 41, and further improves the production efficiency of the pressure-taking tube 41.

[0071] In one embodiment of the present invention, the air inlet tube 23 is provided with a support base 232 , and the mounting section 412 is inserted into the support base 232 .

[0072] It can be understood that the insertion of the mounting section 412 into the support seat 232 increases the contact area between the pressure-taking tube 41 and the support seat 232, thereby improving the stability of the connection between the two and ensuring normal and stable pressure taking of the pressure-taking tube 41. The pressure-taking tube 41 can be fixed by providing a block or a slot in the through-hole of the support seat 232, and the outer wall of the mounting section 412 of the pressure-taking tube 41 is provided with the other of the block or the slot, and the block is snapped into the slot so that the mounting section 412 is snapped to the support seat 232. In this way, fixing the pressure-taking tube 41 by snap-fitting can simplify the installation process of the pressure-taking tube 41. Of course, the present application is not limited to this. In other embodiments, the pressure-taking tube 41 can be fixed by providing an internal thread in the through-hole of the support seat 232, and the outer wall of the mounting section 412 of the pressure-taking tube 41 is provided with an external thread, and the pressure-taking tube 41 and the support seat 232 are connected by threads.

[0073] Please refer to Figure 1 In one embodiment of the present invention, the wind pressure sensing assembly 40 further includes a hose 43 , one end of the hose 43 is connected to an end of the mounting section 412 away from the pressure taking section 411 , and the other end is connected to the wind pressure sensor 42 .

[0074] It can be understood that since the hose 43 has a certain flexibility, the distance between the wind pressure sensor 42 connected by the hose 43 and the pressure taking pipe 41 is not restricted by a fixed value, so that the installation position of the wind pressure sensor 42 can be changed according to the combustion body 10, thereby improving the installation flexibility of the wind pressure sensor 42.

[0075] In one embodiment of the present invention, the main controller 50 is used to obtain the current speed of the fan 20. When the current speed of the fan 20 is less than the preset speed, the current wind pressure value in the airflow channel 100a is obtained through the wind pressure sensor 42. The current wind pressure value is compared with the preset wind pressure value to obtain a wind pressure comparison result. According to the wind pressure comparison result, the speed of the fan 20 is adjusted to make the current wind pressure value consistent with the preset wind pressure value.

[0076] It can be understood that by controlling the start and pause of the wind pressure sensor 42 and the working state of the fan 20 through the main controller 50, the water heater 1000 can be automatically operated, thereby improving the convenience of using the water heater 1000. Specifically, when there is wind pressure resistance in the outside world, since it is opposite to the direction of the air flow in the air flow channel 100a, the pressure in the air flow channel changes, and the wind pressure sensor 42 can detect the pressure change. The pressure change is transmitted to the main controller 50, and the main controller 50 can adjust the speed of the fan 20. For example, the main controller 50 can adjust the electric motor in the fan 20 and increase the speed of the electric motor to increase the air pressure value in the air flow channel 100a, thereby resisting the external wind pressure resistance. Among them, the main controller 50 can obtain the current speed of the fan 20 through a speed testing instrument.

[0077] In one embodiment of the present invention, the combustion device 100 also includes a current sensor, which is electrically connected to the fan 20 and the main controller 50 respectively; the main controller 50 is also used to obtain the current current value of the fan 20 through the current sensor, compare the current current value with the preset current value to obtain a current comparison result, and adjust the rotation speed of the fan 20 according to the current comparison result so that the current wind pressure value remains consistent with the preset wind pressure value.

[0078] It is understood that when the fan 20 is subjected to external wind pressure resistance, its rotational speed will be affected, further affecting the current of the fan 20. Therefore, by detecting changes in the current of the fan 20 through a current sensor, changes in the external wind pressure resistance can also be determined. Thus, by providing both a wind pressure sensor 42 and a current sensor within the combustion device 100, the combustion device 100 can use two different detection methods to determine a decrease in external wind pressure resistance, thereby enhancing the combustion device 100's ability to detect external wind pressure resistance. Upon detecting a change in current, the main controller 50 can adjust the current of the fan 20. By changing the current of the fan 20, the rotational speed of the fan 20 is changed, thereby changing the wind pressure value within the airflow channel 100a until the current wind pressure value is consistent with the preset wind pressure value.

[0079] Furthermore, in order to ensure the accuracy of judging the change of external wind pressure resistance, a preset speed value can be set for the rotation speed of the fan 20. That is, when the operating speed of the fan 20 is less than the preset speed value, it means that the fan 20 is in a low-speed state. At this time, the wind pressure change in the gas flow channel is detected by the wind pressure sensor 42 to judge the change of external wind pressure resistance; when the rotation speed of the fan 20 is greater than or equal to the preset speed, it means that the fan 20 is in a high-speed state. At this time, the change of the current of the fan 20 can be detected by the current sensor to judge the change of external wind pressure resistance. Among them, the preset speed can be 1 / 2, 2 / 3 or 3 / 4 of the maximum speed of the fan 20, etc. The present application does not make a specific limitation on the value of the preset speed, and it can be set according to the actual parameters of different types of fans 20.

[0080] In one embodiment of the present invention, the current sensor is disposed in the main controller 50 .

[0081] It can be understood that such a setting integrates the two and facilitates installation and management, avoids the complexity of wiring due to the large distance between the two, and also reduces the space occupied by the two.

[0082] The present invention also proposes a water heater 1000, which includes a combustion device 100. The specific structure of the combustion device 100 refers to the above-mentioned embodiment. Since the water heater 1000 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0083] The present invention also provides a control method for a water heater 1000, the water heater 1000 includes a combustion device 100, the combustion device 100 includes a combustion body 10, a fan 20 that cooperates with the combustion body 10 to form an air flow channel 100a, a wind pressure sensor 42 for detecting the air pressure in the air flow channel 100a, and a current sensor for detecting the working current of the fan 20. In one embodiment of the present invention, please refer to Figure 8, the control method of the water heater 1000 includes the following steps:

[0084] Step S10, obtaining the current rotation speed of the fan 20;

[0085] Step S20a, when the current speed of the fan 20 is less than the preset speed, the current wind pressure value in the air flow channel 100a is obtained through the wind pressure sensor 42;

[0086] Step S30a, comparing the current wind pressure value with a preset wind pressure value to obtain a wind pressure comparison result;

[0087] Step S40a, adjusting the rotation speed of the fan 20 according to the wind pressure comparison result so that the current wind pressure value is consistent with the preset wind pressure value;

[0088] Step S20b, when the current rotation speed of the fan 20 is greater than or equal to the preset rotation speed, obtaining the current current value of the fan 20 through the current sensor;

[0089] Step S30b, comparing the current current value with a preset current value to obtain a current comparison result;

[0090] Step S40b: adjusting the rotation speed of the fan 20 according to the current comparison result so that the current current value is consistent with the preset current value.

[0091] In one embodiment of the present invention, the current speed of the fan 20, i.e., the actual speed of the fan 20 during operation, can be obtained by setting the speed level of the fan 20 when the water heater 1000 is turned on via the main controller 50 of the combustion device 100. The main controller 50 can support obtaining the speed level. Alternatively, the fan 20 can be detected by a speed sensor, which can then transmit the speed information of the fan 20 to the main controller 50.

[0092] The preset speed is a preset limit value. When the current speed of the fan 20 is less than the preset limit value, it means that the fan 20 is in a relatively low-speed working state. At this time, the current wind pressure value in the airflow channel 100a is obtained through the wind pressure sensor 42. Among them, the preset speed can be 1 / 2, 2 / 3 or 3 / 4 of the maximum speed of the fan 20, etc., and this application does not limit this. Its specific value can be set according to different types of fans 20. The wind pressure sensor 42 can obtain the wind pressure value in the airflow channel 100a in real time to ensure and obtain the wind pressure change in the airflow channel 100a; of course, it can also be intermittent detection, for example: every 1 minute, every 2 minutes or every 3 minutes, to reduce the working loss of the wind pressure sensor 42 and extend the service life of the wind pressure sensor 42. This application does not limit this. It is sufficient to be able to obtain the wind pressure change in the airflow channel 100a.

[0093] The preset air pressure value corresponds to the opening of the gas proportional valve of the water heater 1000. That is, the water heater 1000 has a corresponding preset pressure value at a certain gas flow rate to ensure the required air flow rate for normal operation of the water heater 1000. When there is external wind pressure resistance, the current wind pressure value will be lower than the preset pressure value. Therefore, it is necessary to adjust the speed of the fan 20 to increase the air pressure in the airflow channel 100a to overcome the external wind pressure resistance.

[0094] When the current speed of the fan 20 is greater than or equal to the preset limit value, it indicates that the fan 20 is operating at a relatively high speed. At this time, when there is external pressure resistance, the operating current of the fan 20 can vary significantly. Therefore, the current value of the fan 20 can be obtained through the current sensor. The preset current value also corresponds to the opening of the gas proportional valve of the water heater 1000. That is, when the water heater 1000 is at a certain gas flow rate, the fan 20 has a corresponding preset current value to ensure that there is a certain flow rate within the airflow channel 100a at that gas flow rate. The current sensor obtains the current value of the fan 20 in real time to ensure and obtain the current change of the operating current of the fan 20. Of course, it can also be intermittent detection, for example: every 1 minute, every 2 minutes, or every 3 minutes, to reduce the operating loss of the current sensor and extend the service life of the current sensor. This application is not limited to this. It is sufficient to obtain a relatively small operating current of the fan 20.

[0095] In addition, the speed of the fan 20 can be adjusted by automatically adjusting the speed of the driving motor in the fan 20 through the main controller 50 until the current wind pressure value is consistent with the preset wind pressure value or the current current value is consistent with the preset current value.

Claims

1. A combustion device, applied to a water heater, characterized in that: The combustion device comprises: A combustion body, wherein the combustion body is provided with a combustion chamber and a combustion chamber air inlet and a combustion chamber air outlet communicating with the combustion chamber; A fan, the fan having a fan inlet and a fan outlet, the fan outlet being connected to the combustion chamber inlet, the fan inlet forming an air flow channel through the fan, the combustion chamber, and the combustion chamber to the combustion chamber outlet; a wind pressure sensing assembly, the wind pressure sensing assembly comprising a pressure taking tube and a wind pressure sensor, the pressure taking tube comprising a pressure taking section, the pressure taking section being disposed in the airflow channel and extending parallel to the airflow direction in the airflow channel, the wind pressure sensor being in communication with the pressure taking section; and A main controller, the main controller being electrically connected to the fan and the wind pressure sensor respectively; The pressure taking section is provided at the air inlet of the fan, the air outlet of the fan, the air inlet of the combustion chamber, or the air outlet of the combustion chamber; The pressure-taking section has a pressure-taking end surface at one end away from the wind pressure sensor, and at least one end of the pressure-taking section close to the pressure-taking end surface is accommodated in the air inlet of the fan; The pressure-taking end face is arranged along the direction of the air flow in the air inlet of the fan, the wind pressure sensor has a positive pressure interface, and the end of the pressure-taking section away from the pressure-taking end face is connected to the positive pressure interface of the wind pressure sensor; or the pressure-taking end face is arranged along the direction of the air flow away from the air inlet of the fan, the wind pressure sensor has a negative pressure interface, and the end of the pressure-taking section away from the pressure-taking end face is connected to the negative pressure interface of the wind pressure sensor; The pressure-taking end surface is arranged perpendicular to the extending direction of the pressure-taking section.

2. The combustion device according to claim 1, characterized in that An air inlet tube is protruding from the outer wall of the fan, and the air inlet tube is arranged in a ring on the outside of the fan air inlet, and is provided with an air inlet channel connected to the fan air inlet. At least one end of the pressure taking section close to the pressure taking end face is inserted into the air inlet channel, and the end of the pressure taking section away from the pressure taking end face is connected to the air inlet tube.

3. The combustion device according to claim 2, characterized in that The pressure taking pipe further includes a mounting section, which is connected to the air inlet tube. One end of the mounting section is connected to an end of the pressure taking section away from the pressure taking end surface, and the other end is connected to the wind pressure sensor.

4. The combustion device according to claim 3, characterized in that The installation section and the pressure taking section are arranged at an angle, or are arranged in a straight line; And / or, the air inlet duct is provided with a support base, and the mounting section is inserted into the support base; And / or, the wind pressure sensing assembly further comprises a hose, one end of which is connected to an end of the installation section away from the pressure taking section, and the other end of which is connected to the wind pressure sensor.

5. The combustion device according to any one of claims 1 to 4, characterized in that The main controller is used to obtain the current speed of the fan. When the current speed of the fan is less than the preset speed, the current wind pressure value in the air flow channel is obtained through the wind pressure sensor. The current wind pressure value is compared with the preset wind pressure value to obtain a wind pressure comparison result. According to the wind pressure comparison result, the speed of the fan is adjusted to keep the current wind pressure value consistent with the preset wind pressure value.

6. The combustion device according to claim 5, characterized in that The combustion device further includes a current sensor, which is electrically connected to the fan and the main controller respectively; The main controller is also used to obtain the current current value of the fan through the current sensor, compare the current current value with the preset current value to obtain a current comparison result, and adjust the speed of the fan according to the current comparison result so that the current wind pressure value is consistent with the preset wind pressure value.

7. The combustion device according to claim 6, characterized in that The current sensor is arranged in the main controller.

8. A water heater, characterized in that: Comprising a combustion device as claimed in any one of claims 1 to 7.

9. A method for controlling a water heater, characterized in that: The water heater includes a combustion device, which includes a combustion body, a fan that cooperates with the combustion body to form an air flow channel, a wind pressure sensor for detecting the air pressure in the air flow channel, and a current sensor for detecting the operating current of the fan. The control method of the water heater includes the following steps: Get the current speed of the fan; When the current speed of the fan is less than the preset speed, the current wind pressure value in the air flow channel is obtained by the wind pressure sensor; Comparing the current wind pressure value with a preset wind pressure value to obtain a wind pressure comparison result; According to the wind pressure comparison result, the fan speed is adjusted so that the current wind pressure value is consistent with the preset wind pressure value; When the current speed of the fan is greater than or equal to the preset speed, obtaining the current current value of the fan through the current sensor; Comparing the current current value with a preset current value to obtain a current comparison result; According to the current comparison result, the rotation speed of the fan is adjusted so that the current current value is consistent with the preset current value.

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