Gas pipeline gas tightness detection method and device and heating device

Abstract

The invention discloses a gas pipeline airtightness detection method and device and a heating device, an inlet of a gas pipeline is controlled to be opened so as to communicate a gas source with the gas pipeline, an outlet of the gas pipeline is controlled to be closed so as to cut off gas between the gas pipeline and a burner, high-pressure gas of the gas source enters the gas pipeline through the inlet, and the high-pressure gas enters the gas pipeline through the outlet. In the first time period, the gas source continuously supplies gas to the gas pipeline so that gas in the gas pipeline can be stably kept at a high-pressure threshold value, namely the high-pressure threshold value or above, and in the second time period, due to the fact that the inlet and the outlet of the gas pipeline are closed and the gas pipeline is in a sealed state, if the gas pipeline does not have a leakage point, the gas pipeline can not leak. If not, the pressure of the gas pipeline is kept at the set low-pressure threshold value in the second time period, that is, the pressure is larger than the second threshold value, gas tightness detection passes, and at the moment, production can be directly recovered. According to the scheme, consumed time is short, the furnace temperature cannot be reduced too much, and therefore the production recovery time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of cold rolling and continuous annealing, and in particular to a gas pipeline air tightness detection method, device and heating device. Background Art

[0002] After hot rolling, the strip steel needs to be sent to a normalizing furnace for normalizing treatment to eliminate harmful substances such as AlN and MnS precipitated from the strip steel, thereby improving the strip steel's magnetic properties and uniformity. Normalizing furnaces typically heat the strip by feeding combustible gas through a gas pipeline into a burner for combustion. The gas pipelines require regular airtightness testing to prevent leaks that could affect the normalizing furnace's efficiency.

[0003] The existing gas pipeline leak detection is to connect the nitrogen pipeline on site, introduce high-pressure nitrogen into the gas pipeline, and then use a foaming liquid to manually detect leaks at the flange interfaces, oil interfaces and other parts of the gas pipeline in front of the burner. This method is time-consuming, will cause the furnace temperature to drop, and increase production recovery time. Summary of the Invention

[0004] In view of the above problems, the present application is proposed to provide a gas pipeline air tightness detection method, device and heating device that overcome the above problems or at least partially solve the above problems.

[0005] In a first aspect, a method for detecting gas pipeline air tightness is provided, comprising:

[0006] Controlling the opening of the inlet of the gas pipeline, controlling the closing of the outlet of the gas pipeline and collecting the first pressure of the gas pipeline between the inlet and the outlet, the inlet of the gas pipeline is connected to the gas source, and the outlet of the gas pipeline is connected to the burner;

[0007] If the first pressure is greater than or equal to the first threshold value within the first time period, closing the inlet of the gas pipeline and collecting the second pressure between the inlet and the outlet of the gas pipeline;

[0008] If the second pressure is greater than or equal to the second threshold value in the second time period, it is determined that the gas pipeline is airtight, wherein the second time period is after the first time period and the second threshold value is less than the first threshold value.

[0009] Optionally, the method further includes:

[0010] In the second time period, if it is detected that the second pressure is less than the second threshold, it is determined that the gas pipeline air tightness is abnormal.

[0011] Optionally, the method further includes:

[0012] During the first time period, if it is detected that the first pressure is less than the first threshold, it is determined that the gas pipeline has an abnormal air tightness.

[0013] Optionally, the first time period is 1 to 3 seconds, and the second time period is 5 to 10 minutes.

[0014] In a second aspect, a gas pipeline air tightness detection device is provided, comprising:

[0015] A first valve is provided at the inlet of the gas pipeline, the inlet of the gas pipeline being connected to the gas source;

[0016] The second valve is arranged at the outlet of the gas pipeline, and the outlet of the gas pipeline is connected to the burner;

[0017] A pressure switch is provided in the gas pipeline and is located between the inlet and outlet of the gas pipeline;

[0018] a control mechanism electrically connected to the first valve, the second valve, and the pressure switch;

[0019] Among them, when testing the air tightness of the gas pipeline, the control mechanism is used to control the opening of the first valve and the closing of the second valve, and the pressure switch is used to detect the first pressure of the gas pipeline between the inlet and the outlet, and send the first pressure to the control mechanism; the control mechanism is used to control the closing of the first valve when the first pressure is greater than or equal to the first threshold value within a first time period, and the pressure switch is used to detect the second pressure of the gas pipeline between the inlet and the outlet, and send the second pressure to the control mechanism; the control mechanism is used to determine that the air tightness of the gas pipeline is normal when the second pressure is greater than or equal to the second threshold value within a second time period; the second time period is after the first time period, and the second threshold value is less than the first threshold value.

[0020] Optionally, the gas pipeline air tightness detection device further includes:

[0021] a first time relay electrically connected to the control mechanism and used for timing the first time period;

[0022] The second time relay is electrically connected to the control mechanism and is used for timing the second time period.

[0023] Optionally, the gas pipeline air tightness detection device also includes a display screen having a start button for gas pipeline air tightness detection. The control mechanism is electrically connected to the display screen. The control mechanism is used to respond to the air tightness detection instruction for the gas pipeline triggered by the user through the start button, and control the first valve to open and the second valve to close.

[0024] Optionally, the control mechanism includes a first sub-controller and a second sub-controller, the first sub-controller is electrically connected to the second sub-controller and the display screen respectively, and the second sub-controller is electrically connected to the first valve and the second valve.

[0025] In a third aspect, a heating device is provided, comprising a gas source, a burner, a gas pipeline, and the gas pipeline air tightness detection device of the second aspect.

[0026] Optionally, the heating device provided in the present application further includes an air source and an air duct, the inlet of the air duct is connected to the air source, and the outlet of the air duct is connected to the burner.

[0027] In a fourth aspect, the present application also provides a server, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the server executes the method provided in the first aspect.

[0028] In a fifth aspect, the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the computer executes the method provided in the first aspect.

[0029] In a fifth aspect, the present application also provides a computer program product, comprising a computer program, which, when executed by a computer, enables the computer to execute the method provided in the first aspect.

[0030] The technical solution provided by this application has at least the following technical effects or advantages:

[0031] The gas pipeline air tightness detection method, device and heating device provided by the present application control the opening of the inlet of the gas pipeline to connect the gas source and the gas pipeline, and at the same time control the closing of the outlet of the gas pipeline to cut off the gas between the gas pipeline and the burner. The high-pressure gas of the gas source enters the gas pipeline through the inlet, so that the pressure of the gas channel increases. In the first time period, the gas source continuously ventilates the gas pipeline so that the gas in the gas pipeline is stably maintained at the high-pressure threshold, that is, above the first threshold. In the second time period, since the inlet and outlet of the gas pipeline are closed, the gas pipeline is in a sealed state. If there is no leak in the gas pipeline, then in the second time period, the pressure of the gas pipeline is maintained at the set low-pressure threshold, that is, greater than the second threshold, and the air tightness test is passed, and production can be directly resumed at this time. The solution of the present application is short in time and will not cause the furnace temperature to drop too much, thereby shortening the production recovery time.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0034] Figure 1 This is a flow chart of the gas pipeline air tightness detection method in the embodiment of this application;

[0035] Figure 2 This is a structural diagram of a gas pipeline air tightness detection device in an embodiment of the present application;

[0036] Figure 3 This is a principle logic diagram of the gas pipeline air tightness detection device in the embodiment of this application;

[0037] Figure 4 This is a schematic diagram of an existing normalizing furnace;

[0038] Figure 5 This is a gas pipeline air tightness detection control logic diagram in an embodiment of the present application. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present disclosure will be described below in more detail with reference to the accompanying drawings.

[0040] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments of the present application. These figures are not drawn to scale, and for the purpose of clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0041] In order to better understand the above technical solution, the above technical solution will be described in detail below in combination with specific implementation methods. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0042] The normalizing and pickling line is the first step in the cold rolling process of high-grade non-oriented silicon steel production. It is used to normalize, shot blast, pickle, and slit incoming hot-rolled coils before sending the finished products to the rolling mill. The large temperature difference between the head and tail of the hot-rolled coil results in uneven grain structure between the surface and center layers through the thickness of the strip. After hot rolling, some precipitates such as AlN and MnS, which are highly detrimental to magnetic properties, form in the strip. Therefore, normalizing the hot-rolled coils in a normalizing furnace is an important method for improving the magnetic properties and uniformity of high-grade non-oriented silicon steel.

[0043] Take the normalizing furnace as an example, Figure 4 As shown, the normalizing furnace uses a heating method that combines combustible gas heating and electric heating, and is equipped with an electric heating furnace section 401 and a gas heating furnace section 402. The combustible gas passes through the gas station 403 corresponding to each furnace section, enters the burner 405 of the gas heating furnace section 402 through the gas pipeline 404, and is mixed with the air sent to the burner 405 through the air pipeline 406 for combustion. The traditional gas pipeline leak detection is to disconnect the gas from the gas station 403, pass high-pressure nitrogen into the gas pipeline 404, and manually spray bubbling liquid to detect whether there is a leak in the gas pipeline 404.

[0044] If the gas heating section is shut down during continuous production, when the furnace is restored, the furnace operator needs to connect the nitrogen pipeline on site to introduce high-pressure nitrogen and then use foaming liquid to manually check for leaks at the flange interfaces, oil interfaces and other parts of the pipeline in front of the burner.

[0045] Defect 1: The furnace worker needs to inject nitrogen on site for leak detection, which takes a long time and causes the furnace temperature to drop.

[0046] Defect 2: Due to the limitations of on-site pipeline layout, the leak detection time is very long, resulting in a significant drop in furnace temperature.

[0047] Defect 3: The introduction of high-pressure nitrogen will cause the furnace temperature to drop rapidly, increasing production recovery time.

[0048] In view of this, this application provides a gas pipeline air tightness detection method, please refer to Figure 1 , Figure 1 This is a flow chart of a gas pipeline air tightness detection method in an embodiment of the present application, including:

[0049] S101, controlling the inlet of the gas pipeline to open, controlling the outlet of the gas pipeline to close, and collecting a first pressure between the inlet and outlet of the gas pipeline, wherein the inlet of the gas pipeline is connected to a gas source, and the outlet of the gas pipeline is connected to a burner;

[0050] S102: If the first pressure is greater than or equal to the first threshold value within the first time period, close the inlet of the gas pipeline and collect a second pressure between the inlet and the outlet of the gas pipeline;

[0051] S103: If the second pressure is greater than or equal to the second threshold value in the second time period, it is determined that the gas pipeline is airtight. The second time period is after the first time period, and the second threshold value is less than the first threshold value.

[0052] The gas pipeline air tightness detection method provided by the embodiment of the present application controls the opening of the inlet of the gas pipeline to connect the gas source and the gas pipeline, and controls the closing of the outlet of the gas pipeline to cut off the gas between the gas pipeline and the burner. The high-pressure gas of the gas source enters the gas pipeline through the inlet, so that the pressure of the gas channel increases. In the first time period, the gas source continuously ventilates the gas pipeline so that the gas in the gas pipeline is stably maintained at the high-pressure threshold, that is, above the first threshold. In the second time period, since the inlet and outlet of the gas pipeline are closed, the gas pipeline is in a sealed state. If there is no leak in the gas pipeline, then in the second time period, the pressure of the gas pipeline is maintained at the set low-pressure threshold, that is, above the second threshold, and the air tightness detection passes, and production can be directly resumed at this time. The solution of the present application is short in time and will not cause the furnace temperature to drop too much, thereby shortening the production recovery time.

[0053] It is understandable that as the gas source in the gas pipeline ventilates the gas pipeline, the pressure in the gas pipeline continues to increase. If in the first time period, the pressure in the gas pipeline is difficult to reach and maintain above a higher first threshold, it proves that there is a large leak in the gas pipeline. At this time, there is no need to perform operations in the second time period, and the leak can be detected by manually spraying bubbling liquid into the gas pipeline.

[0054] In some optional implementations, the gas pipeline air tightness detection method provided in the embodiments of the present application further includes:

[0055] In the second time period, if it is detected that the second pressure is less than the second threshold, it is determined that the gas pipeline air tightness is abnormal.

[0056] If there is no leak in the gas pipeline, when the inlet and outlet are disconnected, the pressure should remain above a certain threshold even if it drops compared to the first time period. Therefore, in the second time period, if the pressure continues to drop below the second threshold, it proves that there is a leak in the gas pipeline, and it can be determined that the gas pipeline has an abnormal air tightness.

[0057] In some optional implementations, the gas pipeline air tightness detection method provided in the embodiments of the present application further includes:

[0058] During the first time period, if it is detected that the first pressure is less than the first threshold, it is determined that the gas pipeline has an abnormal air tightness.

[0059] It can be understood that the first time period is the process of inflating the gas pipeline. If there is no leak in the gas pipeline, the pressure in the first time period will continue to rise. If the pressure in the gas pipeline does not increase but decreases during the process of the gas source continuously supplying gas to the gas pipeline, it proves that there is a more obvious leak in the gas pipeline. At this time, it is necessary to disconnect the entrance of the gas pipeline for leak detection, or keep the entrance of the gas pipeline open and detect the leak by spraying foam.

[0060] In some optional embodiments, controlling the inlet of the gas pipeline to open, controlling the outlet of the gas pipeline to close, and collecting a first pressure of the gas pipeline between the inlet and the outlet to obtain the pressure of the gas pipeline includes:

[0061] In response to an air tightness detection instruction for the gas pipeline, the inlet of the gas pipeline is controlled to be opened, the outlet of the gas pipeline is controlled to be closed, and a first pressure between the inlet and the outlet of the gas pipeline is collected.

[0062] In some optional embodiments, the first time period is 1 to 3 seconds, and the second time period is 5 to 10 minutes. The first time period is the inflation stage of the gas pipeline. Since the outlet of the gas pipeline is disconnected, the gas entering the gas pipeline will accumulate quickly. Therefore, the first time period can be set to 1 to 3 seconds. In the second time period, it is necessary to verify the air tightness of the gas pipeline. In order to avoid the situation where there are tiny leaks and the gas leaks too slowly, the second time period can be set to 5 to 10 minutes.

[0063] In the second aspect, a gas pipeline air tightness detection device is provided, such as Figure 2 As shown, the gas pipeline air tightness detection device includes: a first valve 201, disposed at the inlet of a gas pipeline 202, which is connected to a gas source 203; a second valve 204, disposed at the outlet of the gas pipeline 202, which is connected to a burner 205; a pressure switch 206, disposed in the gas pipeline 202 between the inlet and outlet; and a control mechanism 207, electrically connected to the first valve 201, the second valve 204, and the pressure switch 206.

[0064] The gas pipeline air tightness detection device provided in the embodiments of the present application can be used to implement the operations of S101 to S103 of the gas pipeline air tightness detection method provided in the above embodiments. When detecting the air tightness of the gas pipeline, the control mechanism 207 is used to control the first valve 201 to open, thereby opening the inlet of the gas pipeline 202, and to control the second valve 204 to close, thereby closing the outlet of the gas pipeline 202. The pressure switch 206 is used to detect a first pressure between the inlet and outlet of the gas pipeline 202 and transmit the first pressure to the control mechanism 207.

[0065] Control mechanism 207 is configured to control first valve 201 to close, thereby closing the inlet of gas pipeline 202, when the first pressure is greater than or equal to a first threshold value throughout a first time period. Pressure switch 206 is configured to detect a second pressure between the inlet and outlet of gas pipeline 202 and transmit the second pressure to control mechanism 207. If the second pressure is above a second threshold value during a set second time period, gas pipeline 202 is deemed airtight. Control mechanism 207 is configured to determine that gas pipeline 202 is airtight when the second pressure is greater than or equal to the second threshold value throughout a second time period. The second time period occurs after the first time period, and the second threshold value is less than the first threshold value.

[0066] It is understandable that in Figure 2 Schematic diagram of the connection between the outlet of the gas pipeline 202 and one burner 205 is given in FIG. , but it is not limited to that the outlet of the gas pipeline 202 is connected to only one burner 205 , and the outlet of the gas pipeline 202 may be connected to multiple burners 205 .

[0067] The gas pipeline air tightness detection device provided in the embodiment of the present application can be used to solve the manual intervention of gas pipeline leak detection, realize automatic air tightness detection, improve the degree of automation of the production line, shorten the combustible gas pipeline detection time, reduce the significant drop in furnace temperature, quickly restore the normalizing furnace heating, and shorten the time when the normalizing furnace temperature is not in compliance.

[0068] In some optional embodiments, Figure 2 As shown, the gas pipeline air tightness detection device provided in the embodiment of the present application also includes a first time relay 208 and a second time relay 209. The first time relay 208 is electrically connected to the control mechanism 207 for timing the first time period; the second time relay 209 is electrically connected to the control mechanism 207 for timing the second time period.

[0069] The high-pressure point of the pressure switch 206 can be set to a first threshold, and the low-pressure point of the pressure switch 206 can be set to a second threshold. When the first valve 201 is opened and the second valve 204 is closed, the gas source 203 supplies high-pressure gas to the gas pipeline 202. When the pressure switch 206 detects that the pressure of the gas pipeline 202 reaches the first threshold, it sends a signal to the control mechanism 207. The control mechanism 207 controls the first time relay 208 to time the first time period. If, in the first time period, the pressure switch 206 detects that the pressure of the gas pipeline 202 remains above the first threshold, the pressure in the gas pipeline 202 is ensured to be stable.

[0070] When the timing of the first time relay 208 ends, the control mechanism 207 controls the first valve 201 to close to seal the gas pipeline 202, and starts to maintain the pressure in the gas pipeline 202, and at the same time controls the second time relay 209 to time the second time period. If in the second time period, the pressure switch 206 detects the pressure of the gas pipeline 202 and sends a signal to the control mechanism 207, if it is detected that the pressure of the gas pipeline 202 does not drop to less than the second threshold value, it indicates that the gas pipeline 202 is airtight and there is no leakage point, then the burner 205 is ignited and heated.

[0071] For example, if there is no leakage in the gas pipeline 202, the pressure switch 206 continuously sends a low pressure detection signal of 0 to the control mechanism 207. If there is a leak in the pipeline, when the pressure drops below the second threshold, the pressure switch 206 sends a low pressure detection signal of 1 to the control mechanism 207.

[0072] In some optional embodiments, Figure 2 As shown, the gas pipeline air tightness detection device also includes a display screen 210, which has a start button for gas pipeline air tightness detection. The control mechanism 207 is electrically connected to the display screen 210, and is used to respond to the air tightness detection instruction for the gas pipeline 202 input by the user through the start button, control the first valve 201 to open, control the second valve 204 to close, and receive the first pressure between the inlet and outlet of the gas pipeline 202 sent by the pressure switch 206.

[0073] In some optional embodiments, the display screen 210 further includes a display interface for displaying whether the gas pipeline air tightness test is normal or abnormal. For example, if the gas pipeline 202 is airtight, the display interface of the display screen 210 indicates that the gas pipeline air tightness test has passed. If the gas pipeline 202 is airtight, the display interface of the display screen 210 indicates that the gas pipeline air tightness test has failed.

[0074] The control mechanism 207 responds to the air tightness detection instruction for the gas pipeline 202 input by the user through the start button, controls the first valve 201 to open, controls the second valve 204 to close, and receives the first pressure between the inlet and outlet of the gas pipeline 202 sent by the pressure switch 206.

[0075] In some optional embodiments, the control mechanism 207 includes a first controller 2071 and a second controller 2072. The first controller 2071 is electrically connected to the second controller 2072 and the display screen 210. The second controller 2072 is electrically connected to the first valve 201, the second valve 204, the pressure switch 206, the first time relay 208, and the second time relay 209. The first controller 2071 can be a PLC controller, and the second controller 2072 can be an airtight controller. The airtight controller sends feedback commands to the PLC controller based on detection. If there is no leak, the burner 205 is ignited and heated. If there is a leak, an alarm is issued, prompting the user to perform leak treatment.

[0076] It is understandable that the first valve 201 and the second valve 204 can be solenoid valves, and a mechanical ball valve can also be set at the inlet of the gas pipeline 202. The mechanical ball valve is located between the gas source and the first valve 201 and is used to manually control the on and off of the gas pipeline 202.

[0077] Taking a normalizing furnace as an example, the process of performing gas pipeline air tightness detection using the gas pipeline air tightness detection device provided in the above embodiment is to perform gas pipeline leak detection online using combustible gas. The specific operations are as follows:

[0078] like Figure 5 As shown, real-time communication between the airtight controller and the PLC controller is achieved by establishing a communication connection.

[0079] When a gas pipeline leak test is needed, a furnace operator clicks the gas leak test start button on the HMI interface on the monitor. The PLC controller receives the command and sends it to the gas leak controller. HMI stands for Human Machine Interface. The human-machine interface (also known as user interface or user interface) is the medium for interaction and information exchange between the system and the user. It converts information between its internal form and a form that humans can understand.

[0080] The airtightness controller uses internal logic to first open the first valve and close the second valve. High-pressure gas from the gas source enters the gas pipeline. After the pressure switch generates a signal at the high-pressure detection point, the first valve remains open for a delay of T1 to ensure stable pressure in the gas pipeline. After T1 expires, the airtightness controller controls the first valve to close, beginning to maintain pressure in the pipeline.

[0081] The pressure holding time, T2, is controlled by a time relay. After T2 reaches its delay, the airtightness controller receives a low-pressure detection signal from the pressure switch. If there is no leak in the pipeline, the low-pressure detection signal is 0; if there is a leak, the low-pressure detection signal is 1. Based on the detection, the airtightness controller sends feedback commands to the PLC control system. If there is no leak, the burner is ignited and heated. If there is a leak, an alarm is issued, prompting the user to address the leak.

[0082] In some optional embodiments, Figure 2 As shown, the first controller 2071 is also electrically connected to the alarm mechanism 211. If it receives a signal from the second controller 2072 indicating that the gas pipeline air tightness test has passed, that is, there is no leakage, the alarm mechanism 211 is controlled to issue an alarm. The alarm mechanism 211 can use an audible and visual alarm, which is not limited here.

[0083] Based on the same inventive concept, the embodiment of the present application further provides a heating device, including Figure 2 The gas source 203, the burner 205, the gas pipeline 202, and the gas pipeline air tightness detection device of the above embodiment are shown.

[0084] The gas source 203 of the heating device supplies gas to the burner 205 through the gas pipeline 202 for heating the product in the heating device. The gas pipeline air tightness detection device is used to perform air tightness detection on the gas pipeline 202 of the heating device. The specific air tightness detection method is detailed in the operations of S101 to S103 of the above embodiment and will not be repeated here.

[0085] The heating device provided in the embodiment of the present application can regularly detect the air tightness of the gas pipeline by configuring a gas pipeline air tightness detection device, controlling the opening of the inlet of the gas pipeline to connect the gas source and the gas pipeline, and controlling the closing of the outlet of the gas pipeline to cut off the gas between the gas pipeline and the burner. The high-pressure gas of the gas source enters the gas pipeline through the inlet, so that the pressure of the gas channel increases. In the first time period, the gas source continuously ventilates the gas pipeline so that the gas in the gas pipeline is stably maintained at the high-pressure threshold, that is, above the first threshold. In the second time period, since the inlet and outlet of the gas pipeline are closed, the gas pipeline is in a sealed state. If there is no leak in the gas pipeline, then in the second time period, the pressure of the gas pipeline is maintained at the set low-pressure threshold, that is, greater than the second threshold, and the air tightness test is passed, and production can be directly resumed at this time. The present application solution is time-saving and will not cause the furnace temperature to drop too much, thereby shortening the production recovery time.

[0086] In some optional embodiments, such as Figure 3As shown, the heating device further includes an air source 301 and an air duct 302. The inlet of the air duct 302 is connected to the air source 301, and the outlet of the air duct 302 is connected to the burner 205. A third solenoid valve 303 is provided on the air duct 302. The third solenoid valve 303 is electrically connected to the control mechanism 207, specifically to the second controller 2072. When the gas pipeline 202 is tested for air tightness, the second controller 2072 controls the third solenoid valve 303 to close. When it is determined that the gas pipeline 202 is airtight, the second controller 2072 controls the first solenoid valve 201, the second solenoid valve 204, and the third solenoid valve 303 to open, thereby ensuring normal operation of the heating device.

[0087] Still Figure 3 As shown, the gas pipeline air tightness detection device also includes a pressure gauge 304, which is set on the gas pipeline 202 and is used to detect the pressure of the gas pipeline 202 in real time, so that the staff can check the real-time pressure of the gas pipeline 202.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0089] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

Claims

1. A gas pipeline air tightness detection method, characterized in that: include: Controlling the opening of an inlet of a gas pipeline, controlling the closing of an outlet of the gas pipeline, and collecting a first pressure between the inlet and the outlet of the gas pipeline, wherein the inlet of the gas pipeline is connected to a gas source, and the outlet of the gas pipeline is connected to a burner; If the first pressure is greater than or equal to a first threshold value within a first time period, closing the inlet of the gas pipeline and collecting a second pressure between the inlet and the outlet of the gas pipeline; If the second pressure is greater than or equal to a second threshold value within a second time period, it is determined that the gas pipeline is airtight and normal, wherein the second time period is after the first time period and the second threshold value is less than the first threshold value.

2. The gas pipeline air tightness detection method according to claim 1, characterized in that: Also includes: During the second time period, if it is detected that the second pressure is less than the second threshold, it is determined that the gas pipeline has an abnormal air tightness.

3. The gas pipeline air tightness detection method according to claim 1, characterized in that: Also includes: During the first time period, if it is detected that the first pressure is less than the first threshold, it is determined that the gas pipeline has an abnormal air tightness.

4. The gas pipeline air tightness detection method according to claim 1, characterized in that: The first time period is 1 to 3 seconds, and the second time period is 5 to 10 minutes.

5. A gas pipeline air tightness detection device, characterized in that: include: a first valve, disposed at an inlet of a gas pipeline, the inlet of the gas pipeline being connected to a gas source; a second valve, disposed at the outlet of the gas pipeline, the outlet of the gas pipeline being connected to the burner; a pressure switch, disposed in the gas pipeline and located between the inlet and the outlet of the gas pipeline; a control mechanism electrically connected to the first valve, the second valve, and the pressure switch; Wherein, when the air tightness of the gas pipeline is detected, the control mechanism is used to control the first valve to open and the second valve to close, and the pressure switch is used to detect the first pressure of the gas pipeline between the inlet and the outlet, and send the first pressure to the control mechanism; the control mechanism is used to control the first valve to close when the first pressure is greater than or equal to a first threshold value within a first time period, and the pressure switch is used to detect the second pressure of the gas pipeline between the inlet and the outlet, and send the second pressure to the control mechanism; the control mechanism is used to determine that the air tightness of the gas pipeline is normal when the second pressure is greater than or equal to a second threshold value within a second time period; the second time period is after the first time period, and the second threshold value is less than the first threshold value.

6. The gas pipeline air tightness detection device according to claim 5, characterized in that: Also includes: a first time relay, electrically connected to the control mechanism, for timing the first time period; The second time relay is electrically connected to the control mechanism and is used to time the second time period.

7. The gas pipeline air tightness detection device according to claim 5, characterized in that: It also includes a display screen having a start button for gas pipeline air tightness detection. The control mechanism is electrically connected to the display screen. The control mechanism is used to control the first valve to open and the second valve to close in response to an air tightness detection instruction for the gas pipeline triggered by the user through the start button.

8. The gas pipeline air tightness detection device according to claim 7, characterized in that: The control mechanism includes a first sub-controller and a second sub-controller. The first sub-controller is electrically connected to the second sub-controller and the display screen respectively, and the second sub-controller is electrically connected to the first valve and the second valve.

9. A heating device, characterized in that: The invention comprises a gas source, a burner, a gas pipeline, and the gas pipeline air tightness detection device according to any one of claims 5 to 8.

10. The heating device according to claim 9, characterized in that It also includes an air source and an air pipeline, wherein the inlet of the air pipeline is connected to the air source, and the outlet of the air pipeline is connected to the burner.

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