Control method of gas heating equipment and gas heating equipment

Abstract

The present invention relates to the technical field of heating equipment, and discloses a control method for gas heating equipment and a gas heating equipment. In response to the gas heating equipment being in a preparatory state before ignition, the present invention obtains a first pressure difference detected by a pressure sensor; if the first pressure difference is greater than a preset pressure difference, the opening of a gas proportional valve is adjusted based on the difference between the first pressure difference and the preset pressure difference to obtain a target opening; based on the target opening, the burner of the gas heating equipment is controlled to ignite and start. The first pressure difference between the air pressure and the gas pressure is detected, and the opening of the gas proportional valve is adjusted according to the difference between the first pressure difference and the preset pressure difference to obtain the target opening, and the target opening is used as the opening of the gas proportional valve at the time of ignition and start, so that only by calibrating the opening of the gas proportional valve at the time of ignition and start, the rapid calibration of the ignition and start of the gas heating equipment can be completed, the probability of successful ignition is improved, and the process of ignition calibration is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of heating equipment, and in particular to a control method of gas heating equipment and the gas heating equipment. Background Art

[0002] At present, in heating equipment, such as fully premixed gas wall-mounted boilers, the gas proportional valve needs to be debugged for ignition calibration before the whole machine is assembled and debugged at the factory or started for the first time, otherwise it will not be able to ignite. When debugging the gas proportional valve, it is necessary to manually adjust the opening of the gas proportional valve corresponding to large load and small load, and try to ignite. After the ignition is successful, it is necessary to use oxygen or carbon dioxide sensors to detect the combustion products, and adjust the opening of the gas proportional valve for large load and small load again, so that the combustion products of the maximum load and minimum load meet the design requirements. During the adjustment process, it is necessary to repeatedly adjust the adjustment screws at the large end and the small end, resulting in a complicated and cumbersome process for adjusting the gas proportional valve and ignition calibration, and low efficiency. Summary of the invention

[0003] The first technical problem solved by the present invention is to provide a control method for gas heating equipment, which effectively solves the problem of complicated and cumbersome ignition calibration process and low efficiency.

[0004] The second technical problem solved by the present invention is to provide a gas heating device, which effectively solves the problem that the ignition calibration process is complicated and inefficient.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A control method for a gas heating device, the gas heating device comprising an air branch pipe, a gas branch pipe and a pressure sensor, the air branch pipe being arranged on an air pipeline of the gas heating device, the gas branch pipe being arranged on a gas pipeline of the gas heating device, the pressure sensor being used to detect a pressure difference between an air pressure of the air branch pipe and a gas pressure of the gas branch pipe; the method comprising:

[0007] In response to the gas heating device being in a pre-ignition preparation state, obtaining a first pressure difference detected by the pressure sensor, wherein the pre-ignition preparation state includes controlling the operation of a fan of the gas heating device;

[0008] If the first pressure difference is greater than the preset pressure difference, the opening of the gas proportional valve is adjusted based on the difference between the first pressure difference and the preset pressure difference to obtain a target opening;

[0009] Based on the target opening, the burner ignition and start-up of the gas heating equipment are controlled.

[0010] Compared with the background technology, the control method of the gas heating equipment of the present invention has the following beneficial effects: a preset pressure difference is set for the gas heating equipment, the preset pressure difference is the pre-obtained pressure difference when the gas heating equipment can be normally ignited and started, and a first pressure difference between the air pressure and the gas pressure is detected, and according to the difference between the first pressure difference and the preset pressure difference, the opening of the gas proportional valve is adjusted to obtain a target opening, and the target opening is used as the opening of the gas proportional valve at ignition and start, so that the ignition and start of the gas heating equipment can be quickly calibrated only by calibrating the opening of the gas proportional valve at ignition and start, thereby improving the probability of successful ignition, and there is no need to repeatedly manually adjust the opening of the gas proportional valve corresponding to large loads and small loads, and the ignition calibration process is simple.

[0011] In one embodiment, based on the magnitude relationship between the current pressure difference and the preset pressure difference, the opening of the gas proportional valve is adjusted to obtain the target opening, including:

[0012] Increasing the current opening of the gas proportional valve by a preset opening, and obtaining a second pressure difference detected by the pressure sensor;

[0013] If the second pressure difference is equal to the preset pressure difference, the target opening is determined based on the current opening.

[0014] In one embodiment, based on the magnitude relationship between the current pressure difference and the preset pressure difference, the opening of the gas proportional valve is adjusted to obtain the target opening, and the method further includes:

[0015] If the second pressure difference is greater than the preset pressure difference, the current opening of the gas proportional valve is further increased by the preset opening, and the third pressure difference detected by the pressure sensor is obtained.

[0016] In one embodiment, determining the target opening degree based on the current opening degree includes:

[0017] Controlling the gas proportional valve to operate for a first preset time according to the current opening, and obtaining a fourth pressure difference detected by the pressure sensor;

[0018] If, within the first preset time period, the fourth pressure difference is within the preset pressure difference range corresponding to the preset pressure difference, the current opening is determined as the target opening.

[0019] In one embodiment, determining the target opening degree based on the current opening degree further includes:

[0020] If the fourth pressure difference is outside the preset pressure difference range within the first preset time period, the current opening of the gas proportional valve is increased by the preset opening, and the fifth pressure difference detected by the pressure sensor is obtained.

[0021] In one embodiment, the preset pressure difference range is the pressure difference range between the minimum preset pressure difference and the maximum preset pressure difference; the minimum preset pressure difference is the difference between the preset pressure difference and the preset tolerance, and the maximum preset pressure difference is the sum of the preset pressure difference and the preset tolerance.

[0022] In one embodiment, the method further comprises:

[0023] If the first pressure difference is less than or equal to the preset pressure difference, it is determined that the gas heating equipment has a fault.

[0024] In one of the embodiments, in response to the gas heating device being in a pre-ignition preparation state, before obtaining the first pressure difference detected by the pressure sensor, the method further includes:

[0025] Controlling the fan to run at a first speed for a second preset time, and determining an operating state of the fan;

[0026] If the operating status of the fan is abnormal, it is determined that the gas heating equipment is faulty;

[0027] If the operating state of the fan is normal operation, the fan is controlled to operate at a second speed so that the gas heating equipment enters a pre-ignition pre-state.

[0028] In one embodiment, after controlling the ignition start of the burner of the gas heating equipment based on the target opening, the method further includes:

[0029] In response to the gas heating device being turned off, the burner is controlled to be turned off, and the fan is controlled to run at a third speed for a third preset time period.

[0030] The above second technical problem is solved by the following technical solution:

[0031] A gas heating device comprises an air pipe, a gas pipe, an air branch pipe, a gas branch pipe, a pressure sensor and a controller; the air branch pipe is arranged on the air pipe, and the gas branch pipe is arranged on the gas pipe;

[0032] The pressure sensor is used to detect the pressure difference between the air pressure of the air branch pipe and the gas pressure of the gas branch pipe; the controller is used to execute the control method of any gas heating equipment as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a structural schematic diagram of a premixer in a gas heating device according to an embodiment of the present invention;

[0035] Figure 2 It is a flow chart of a control method of a gas heating device according to an embodiment of the present invention;

[0036] Figure 3 It is a schematic flow chart of adjusting the opening of a gas proportional valve in a control method of a gas heating device according to an embodiment of the present invention;

[0037] Figure 4 It is a flow chart of determining a target opening based on a current opening in a control method for a gas heating device according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Air pipeline; 2. Gas pipeline; 3. Mixing pipeline; 4. Air branch pipe; 5. Gas branch pipe; 6. Gas proportional valve; 7. Pressure sensor; 8. Air flow limiting ring; 9. Nozzle. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] As described in the background technology, in related technologies, such as fully premixed gas wall-mounted boilers, before the whole machine is assembled and debugged at the factory or before the first start-up, the gas proportional valve needs to be debugged for ignition calibration, otherwise it will not be able to ignite. When debugging the gas proportional valve, it is necessary to manually adjust the opening of the gas proportional valve corresponding to large loads and small loads, and try to ignite. After the ignition is successful, it is necessary to use oxygen or carbon dioxide sensors to detect the combustion products, and adjust the opening of the gas proportional valve for large loads and small loads again, so that the combustion products of the maximum load and minimum load meet the design requirements. During the adjustment process, it is necessary to repeatedly adjust the adjustment screws at the large end and the small end, resulting in a complicated and cumbersome process for adjusting the gas proportional valve and ignition calibration, and low efficiency.

[0044] Based on this, an embodiment of the present invention provides a control method for a gas heating device, in response to the gas heating device being in a preparatory state before ignition, a first pressure difference detected by a pressure sensor is obtained; if the first pressure difference is greater than a preset pressure difference, the opening of the gas proportional valve is adjusted based on the difference between the first pressure difference and the preset pressure difference to obtain a target opening; based on the target opening, the burner of the gas heating device is controlled to ignite and start. A preset pressure difference is set for the gas heating device, and the preset pressure difference is a pre-obtained pressure difference when the gas heating device can be normally ignited and started. The first pressure difference between the air pressure and the gas pressure is detected, and the opening of the gas proportional valve is adjusted according to the difference between the first pressure difference and the preset pressure difference to obtain the target opening, and the target opening is used as the opening of the gas proportional valve at the time of ignition and start, so that only by calibrating the opening of the gas proportional valve at the time of ignition and start, the rapid calibration of the ignition and start of the gas heating device can be completed, and the probability of successful ignition is improved, and there is no need to repeatedly manually adjust the opening of the gas proportional valve corresponding to large load and small load, and the process of ignition calibration is simple.

[0045] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0046] According to an embodiment of the present invention, on the one hand, a control method for a gas heating device is provided.

[0047] The control method of the gas heating equipment provided in the embodiment of the present invention can be applied to the gas heating equipment. The gas heating equipment may include an air pipe, a gas pipe, an air branch pipe, a gas branch pipe and a pressure sensor. The air branch pipe is arranged on the air pipe, the gas branch pipe is arranged on the gas pipe, and the pressure sensor is used to detect the pressure difference between the air pressure of the air branch pipe and the gas pressure of the gas branch pipe.

[0048] In the embodiment of the present invention, the premixer of the gas heating equipment adopts a full premixing structure, and the above-mentioned air branch pipe, gas branch pipe, air pipeline, gas pipeline and pressure sensor are all related structural components in the premixer. Figure 1is a schematic diagram of the structure of a premixer in a gas heating device according to an embodiment of the present invention. Figure 1 As shown, the premixer includes: an air pipeline 1, a gas pipeline 2, a mixing pipeline 3, an air branch pipe 4, a gas branch pipe 5, a gas proportional valve 6 and a pressure sensor 7. The air pipeline 1 is used to input air, and the gas pipeline 2 is used to input gas. The air input from the air pipeline 1 and the gas input from the gas pipeline 2 are fully mixed in the mixing pipeline 3 to form a mixed gas, which will then pass through the fan and burner of the gas heating equipment for combustion.

[0049] In the embodiment of the present invention, Figure 1 As shown, the air branch pipe 4 is arranged on the air pipeline 1 and is a branch pipe of the air pipeline 1. The gas branch pipe 5 is arranged on the gas pipeline 2 and is a branch pipe of the gas pipeline 2. The ends of the air branch pipe 4 and the gas branch pipe 5 are respectively connected to the pressure sensor 7, which is a wind pressure sensor for detecting the pressure difference between the air pressure in the air branch pipe 4 and the gas pressure in the gas branch pipe 5.

[0050] In the embodiment of the present invention, Figure 1 As shown, the gas pipeline 2 is connected to the gas proportional valve 6, and the other end of the gas proportional valve 6 is connected to the gas intake pipeline. The gas proportional valve 6 is used to control the gas flow rate delivered from the gas intake pipeline to the gas pipeline 2. When the gas heating equipment is not started, the gas proportional valve 6 is closed, and the gas pipeline 2 and the gas branch pipe 5 are close to vacuum, and the gas pressure is very small.

[0051] In the embodiment of the present invention, Figure 1 As shown, the premixer may further include an air flow limiting ring 8 and a nozzle 9. The air flow limiting ring 8 connects the air pipeline 1 and the mixing pipeline 3, and is used to limit the air flow entering the mixing pipeline 3; the nozzle 9 connects the gas pipeline 2 and the mixing pipeline 3, and is used to introduce the gas into the mixing pipeline 3 and limit the gas flow entering the mixing pipeline 3, so as to atomize the gas and ensure that the gas and air are fully mixed.

[0052] See also Figure 2 , Figure 2 FIG. 1 is a flow chart of a control method for a gas heating device according to an embodiment of the present invention. Figure 2 As shown, the method includes:

[0053] Step 210: In response to the gas heating device being in a pre-ignition preparation state, obtaining a first pressure difference detected by a pressure sensor.

[0054] In the embodiment of the present invention, the gas heating equipment needs to be calibrated once for ignition before it is assembled or used, so as to ensure that it can be ignited and started normally during use. When the gas heating equipment is in standby mode, the preparatory operation before ignition is performed to make the various structural components of the gas heating equipment fully prepared for ignition, and at the same time, the gas heating equipment is controlled to enter the preparatory state before ignition, wherein the preparatory state before ignition includes controlling the operation of the fan of the gas heating equipment. In response to the gas heating equipment being in a preparatory state before ignition, ignition calibration is started to obtain a first pressure difference detected by the pressure sensor. Since the gas proportional valve is closed when entering the calibration mode, the first pressure difference represents the pressure difference between the air pressure and the gas pressure when the gas proportional valve is closed, that is, the pressure difference between the air pressure in the air branch pipe and the gas pressure in the gas branch pipe; wherein, since the pressure sensor is arranged at the ends of the air branch pipe and the gas branch pipe, the pressure difference detected by the pressure sensor is a static pressure difference, that is, the pressure difference between the air static pressure and the gas static pressure. Since the static pressure is the pressure exerted by fluid molecules on the container wall or the fluid itself, the movement speed of the fluid is not considered. Therefore, the first pressure difference can accurately reflect the difference or ratio between the air flow in the air pipe and the gas flow in the gas pipe when the gas proportional valve is closed.

[0055] Step 220: If the first pressure difference is greater than the preset pressure difference, the opening of the gas proportional valve is adjusted based on the difference between the first pressure difference and the preset pressure difference to obtain a target opening.

[0056] In an embodiment of the present invention, the preset pressure difference is a calibrated pressure difference pre-set for the current gas heating equipment, and the preset pressure difference is the pressure difference between the air pressure and the gas pressure when the gas heating equipment is normally ignited and started; the preset pressure difference can be the minimum pressure difference that can meet the normal ignition and start of the gas heating equipment, or it can be the pressure difference that meets the normal ignition and start of the gas heating equipment and works in an ideal working state, and no specific restrictions are made here.

[0057] In the embodiment of the present invention, since the gas heating equipment enters the calibration mode in the standby state, the gas proportional valve has not yet been opened, no gas enters the gas pipeline and the gas branch pipe, and the gas pipeline and the gas branch pipe are close to a vacuum, so the gas pressure is very small. Accordingly, under theoretical circumstances, the first pressure difference should be greater than the preset pressure difference.

[0058] In the embodiment of the present invention, if the first pressure difference is greater than the preset pressure difference, it means that the gas pipeline is normal and further ignition calibration can be performed. At this time, based on the difference between the first pressure difference and the preset pressure difference, the opening of the gas proportional valve is adjusted to adjust the pressure difference between the air pressure and the gas pressure to the preset pressure difference, and the opening of the gas proportional valve when the pressure difference between the air pressure and the gas pressure is equal to the preset pressure difference is taken as the target opening. The target opening is the opening of the gas proportional valve when the gas heating equipment is ignited and started.

[0059] In the embodiment of the present invention, if the first pressure difference is less than or equal to the preset pressure difference, it means that there is gas circulation in the gas pipeline. At this time, there may be a fault such as the gas pipeline is not properly connected or the gas pipeline is leaking, so the ignition calibration cannot be continued. Specifically, if the first pressure difference is less than or equal to the preset pressure difference, it is determined that the gas heating equipment has a fault, and the ignition calibration is stopped, a fault message is issued to indicate the gas heating equipment fault, and the fault protection of the gas heating equipment is executed.

[0060] In one embodiment, the gas pressure in the gas branch pipe can also be detected by a pressure sensor, and whether the gas pipeline is abnormal or faulty can be determined based on the gas pressure. Similar to detecting the pressure difference between air pressure and gas pressure, the detection of gas pressure is also to detect its static pressure to eliminate the interference caused by gas flow. Accordingly, a preset gas pressure can be set to determine whether the gas pipeline is connected normally. If the gas pressure is less than the preset gas pressure, it can be considered that the gas pipeline is connected normally, and ignition calibration can be performed at this time. If the gas pressure is greater than the preset gas pressure, it can be considered that the gas pipeline is not connected normally, and it is determined that the gas heating equipment is faulty, and ignition calibration is stopped at the same time.

[0061] In one embodiment, different models of gas heating equipment have different specific values ​​of corresponding preset pressure differences due to different equipment designs and component selections. Accordingly, different models of gas heating equipment can be tested and data collected in advance to obtain and record the preset pressure differences corresponding to different models of gas heating equipment; when ignition calibration is performed on the gas heating equipment, the corresponding preset pressure difference is found according to the model of the gas heating equipment.

[0062] In one embodiment, the pressure difference between the air pressure and the gas pressure when multiple gas heating devices of the same model are normally ignited and started is detected respectively, and the measured values ​​of multiple preset pressure differences of the gas heating devices of the same model are obtained, and data processing is performed according to the measured values ​​of the multiple preset pressure differences to obtain the preset pressure difference of the gas heating device of the model. The data processing of the measured values ​​of the multiple preset pressure differences may include averaging, taking the maximum value, etc., which are not specifically limited here.

[0063] Step 230: Based on the target opening, control the burner of the gas heating equipment to ignite and start.

[0064] In the embodiment of the present invention, after the pressure difference between the air pressure and the gas pressure is adjusted to the preset pressure difference and the target opening is obtained, the ignition calibration of the gas heating device is completed and the gas heating device can be ignited and started. When the gas heating device is ignited and started, the opening of the gas proportional valve is adjusted to the target opening, and the burner is controlled to ignite and start, thereby completing the ignition and start of the gas heating device.

[0065] In one embodiment, Figure 3 FIG. 1 is a flow chart of adjusting the opening of a gas proportional valve in a control method of a gas heating device according to an embodiment of the present invention, such as Figure 3 As shown, the above step 220 may include:

[0066] Step 310: Increase the current opening of the gas proportional valve by a preset opening, and obtain a second pressure difference detected by the pressure sensor.

[0067] In an embodiment of the present invention, if the first pressure difference is greater than the preset pressure difference, the current opening of the gas proportional valve is increased by the preset opening, and after the preset opening is increased, the pressure difference between the air pressure and the gas pressure detected by the pressure sensor is re-obtained and updated, that is, the second pressure difference is obtained, so as to determine the direct relationship between the pressure difference between the air pressure and the gas pressure after the gas proportional valve is adjusted and the preset pressure difference based on the second pressure difference.

[0068] In one embodiment, the pressure difference between the air pressure and the gas pressure can be divided into multiple pressure difference intervals according to the difference between the pressure difference and the preset pressure difference, and different pressure difference intervals correspond to different preset openings, i.e., the first preset opening, the second preset opening, etc. The larger the difference between the pressure difference corresponding to the pressure difference interval and the preset pressure difference, the larger the corresponding preset opening, so that when the difference between the pressure difference between the air pressure and the gas pressure and the preset pressure difference is large, rapid adjustment is performed to make the pressure difference between the air pressure and the gas pressure quickly approach the preset pressure difference, and when the difference between the pressure difference between the air pressure and the gas pressure and the preset pressure difference is small, precise adjustment is performed to ensure that the pressure difference between the air pressure and the gas pressure can be accurately adjusted to the preset pressure difference.

[0069] In one embodiment, if the second pressure difference is greater than the preset pressure difference, it indicates that the current gas pressure is still too low and the opening of the gas proportional valve needs to be increased, so the current opening of the gas proportional valve is further increased by the preset opening, and the third pressure difference detected by the pressure sensor is obtained, that is, the pressure difference between the air pressure and the gas pressure detected by the pressure sensor is re-obtained and updated. The current opening of the gas proportional valve is continuously adjusted, and the pressure difference between the air pressure and the gas pressure is updated after each adjustment until the pressure difference between the air pressure and the gas pressure is equal to the preset pressure difference, and the adjustment of the gas proportional valve and the ignition calibration of the gas heating equipment are completed.

[0070] Step 320: If the second pressure difference is equal to the preset pressure difference, determine the target opening degree based on the current opening degree.

[0071] In the embodiment of the present invention, if the second pressure difference is equal to the preset pressure difference, it means that the gas heating equipment can be ignited and started normally under the current opening of the gas proportional valve, so the target opening is determined based on the current opening.

[0072] In one embodiment, if the second pressure difference is equal to the preset pressure difference, the current opening of the gas proportional valve can be directly determined as the target opening to achieve rapid calibration of the ignition start-up of the gas heating equipment.

[0073] In one embodiment, in order to ensure that the pressure difference between the air pressure and the gas pressure can be maintained at a preset pressure difference when the gas proportional valve is adjusted to the target opening, that is, in order to ensure the stability of the ignition start-up of the gas heating equipment, when the second pressure difference is equal to the preset pressure difference, the opening of the gas proportional valve is maintained at the target opening to confirm whether the second pressure difference can be maintained at the preset pressure difference. Specifically, Figure 4 is a flow chart of determining a target opening based on a current opening in a control method for a gas heating device according to an embodiment of the present invention. Figure 4 As shown, the above step 320 may include:

[0074] Step 410: Control the gas proportional valve to operate for a first preset time period according to the current opening, and obtain a fourth pressure difference detected by the pressure sensor.

[0075] In the embodiment of the present invention, within a first preset time period, the opening of the gas proportional valve is maintained at the current opening, so that the gas proportional valve works for the first preset time period according to the current opening; at the same time, within the first preset time period, the fourth pressure difference detected by the pressure sensor is continuously obtained, so that within the first preset time period, the pressure difference between the air pressure and the gas pressure is monitored to confirm whether the pressure difference between the air pressure and the gas pressure can be maintained at the preset pressure difference.

[0076] Step 420: If the fourth pressure difference is within the preset pressure difference range corresponding to the preset pressure difference within the first preset time period, the current opening is determined as the target opening.

[0077] In the embodiment of the present invention, if within the first preset time, the fourth pressure difference is within the preset pressure difference range corresponding to the preset pressure difference, it indicates that the pressure difference between the air pressure and the gas pressure can be maintained within the preset pressure difference, and therefore the current opening is determined as the target opening.

[0078] In one embodiment, if the fourth pressure differential is outside the preset pressure differential range within the first preset time period, it indicates that the pressure differential between the air pressure and the gas pressure cannot be maintained at the preset pressure differential. Therefore, it is necessary to continue to adjust the opening of the gas proportional valve, increase the current opening of the gas proportional valve by the preset opening, and obtain the fifth pressure differential detected by the pressure sensor.

[0079] In one embodiment, the preset pressure difference range is a pressure difference range between a minimum preset pressure difference and a maximum preset pressure difference, wherein the minimum preset pressure difference is a difference between the preset pressure difference and a preset tolerance, and the maximum preset pressure difference is a sum of the preset pressure difference and the preset tolerance.

[0080] In one embodiment, in order to ensure that the gas heating equipment can operate safely for ignition calibration, dust and debris accumulated in the fan and its surrounding environment in the gas heating equipment are cleared before ignition calibration. Specifically, in the above step 210, in response to the gas heating equipment being in a preparatory state before ignition, before obtaining the first pressure difference detected by the pressure sensor, it also includes the relevant steps of controlling the fan for pre-cleaning. Specifically, the fan is controlled to run at a first speed for a second preset time, and the operating state of the fan is determined; if the operating state of the fan is abnormal operation, it is determined that the gas heating equipment has a fault; if the operating state of the fan is normal operation, the fan is controlled to run at a second speed, so that the gas heating equipment enters a preparatory state before ignition, thereby performing ignition calibration. At the same time, during the ignition calibration process, the fan is kept running at the second speed.

[0081] In one embodiment, after the gas heating device is finished running, the fan is also controlled to perform post-cleaning to remove dust and debris accumulated during the operation to ensure that the gas heating device can operate safely. Specifically, in response to the gas heating device being shut down, the burner is controlled to be shut down, and the fan is controlled to run at a third speed for a third preset time.

[0082] The control method of the gas heating equipment provided by the embodiment of the present invention obtains the first pressure difference detected by the pressure sensor in response to the gas heating equipment being in a preparatory state before ignition; if the first pressure difference is greater than the preset pressure difference, the opening of the gas proportional valve is adjusted based on the difference between the first pressure difference and the preset pressure difference to obtain the target opening; based on the target opening, the burner of the gas heating equipment is controlled to ignite and start. A preset pressure difference is set for the gas heating equipment, and the preset pressure difference is the pressure difference obtained in advance when the gas heating equipment can be normally ignited and started. The first pressure difference between the air pressure and the gas pressure is detected, and the opening of the gas proportional valve is adjusted according to the difference between the first pressure difference and the preset pressure difference to obtain the target opening, and the target opening is used as the opening of the gas proportional valve at the time of ignition and start, so that the rapid calibration of the ignition and start of the gas heating equipment can be completed only by calibrating the opening of the gas proportional valve at the time of ignition and start, thereby improving the probability of successful ignition, and there is no need to repeatedly adjust the opening of the gas proportional valve corresponding to large load and small load by manual adjustment, and the process of ignition calibration is simple.

[0083] According to an embodiment of the present invention, on the other hand, a gas heating device is provided, comprising an air pipe, a gas pipe, an air branch pipe, a gas branch pipe, a pressure sensor and a controller. The air branch pipe is arranged on the air pipe, and the gas branch pipe is arranged on the gas pipe; the pressure sensor is used to detect the pressure difference between the air pressure of the air branch pipe and the gas pressure of the gas branch pipe; and the controller is used to execute any of the control methods for the gas heating device described above.

[0084] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The specific contents of the above specific implementations only express several implementations of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A control method for gas heating equipment, characterized in that: The gas heating equipment comprises an air branch pipe, a gas branch pipe and a pressure sensor, wherein the air branch pipe is arranged on the air pipeline of the gas heating equipment, the gas branch pipe is arranged on the gas pipeline of the gas heating equipment, and the pressure sensor is used to detect the pressure difference between the air pressure of the air branch pipe and the gas pressure of the gas branch pipe; the method comprises: In response to the gas heating device being in a pre-ignition preparation state, obtaining a first pressure difference detected by the pressure sensor, wherein the pre-ignition preparation state includes controlling the operation of a fan of the gas heating device; If the first pressure difference is greater than a preset pressure difference, adjusting the opening of the gas proportional valve based on the difference between the first pressure difference and the preset pressure difference to obtain a target opening; Based on the target opening, the burner of the gas heating equipment is controlled to ignite and start.

2. The method according to claim 1, characterized in that The adjusting the opening of the gas proportional valve based on the magnitude relationship between the current pressure difference and the preset pressure difference to obtain the target opening includes: Increasing the current opening of the gas proportional valve by a preset opening, and acquiring a second pressure difference detected by the pressure sensor; If the second pressure difference is equal to the preset pressure difference, the target opening is determined based on the current opening.

3. The method according to claim 2, characterized in that The step of adjusting the opening of the gas proportional valve based on the magnitude relationship between the current pressure difference and the preset pressure difference to obtain a target opening also includes: If the second pressure difference is greater than the preset pressure difference, the current opening of the gas proportional valve is further increased by the preset opening, and the third pressure difference detected by the pressure sensor is obtained.

4. The method according to claim 2, characterized in that: The determining the target opening degree based on the current opening degree comprises: Controlling the gas proportional valve to operate for a first preset time period according to the current opening, and obtaining a fourth pressure difference detected by the pressure sensor; If, within the first preset time period, the fourth pressure difference is within the preset pressure difference range corresponding to the preset pressure difference, the current opening is determined as the target opening.

5. The method according to claim 4, characterized in that The determining the target opening degree based on the current opening degree further includes: If the fourth pressure difference is outside the preset pressure difference range within the first preset time period, the current opening of the gas proportional valve is increased by the preset opening, and the fifth pressure difference detected by the pressure sensor is obtained.

6. The method according to claim 4 or 5, characterized in that: The preset pressure difference range is the pressure difference range between the minimum preset pressure difference and the maximum preset pressure difference; the minimum preset pressure difference is the difference between the preset pressure difference and the preset tolerance, and the maximum preset pressure difference is the sum of the preset pressure difference and the preset tolerance.

7. The method according to claim 1, characterized in that The method further comprises: If the first pressure difference is less than or equal to the preset pressure difference, it is determined that the gas heating equipment fails.

8. The method according to claim 1, characterized in that In response to the gas heating device being in a pre-ignition preparation state, before obtaining the first pressure difference detected by the pressure sensor, the method further includes: Controlling the fan to operate at a first speed for a second preset time period, and determining an operating state of the fan; If the operating state of the fan is abnormal, it is determined that the gas heating equipment is faulty; If the operating state of the fan is normal operation, the fan is controlled to operate at a second speed so that the gas heating equipment enters a pre-ignition pre-state.

9. The method according to claim 1, characterized in that: After controlling the burner of the gas heating equipment to ignite and start based on the target opening, the method further includes: In response to the gas heating device being turned off, the burner is controlled to be turned off, and the fan is controlled to run at a third speed for a third preset time period.

10. A gas heating device, characterized in that: It includes an air pipeline, a gas pipeline, an air branch pipe, a gas branch pipe, a pressure sensor and a controller; the air branch pipe is arranged on the air pipeline, and the gas branch pipe is arranged on the gas pipeline; The pressure sensor is used to detect the pressure difference between the air pressure of the air branch pipe and the gas pressure of the gas branch pipe; the controller is used to execute the control method of the gas heating equipment described in claims 1-9.

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