Emergency shut-off valve, gas pipeline system and method for detecting the state inside a pipeline

Abstract

The present invention discloses an emergency cut-off valve, a gas pipeline system and a method for detecting the state inside a pipeline. The emergency cut-off valve includes: a ventilation pipeline disposed inside the gas pipeline; a grid plate disposed inside the ventilation pipeline; a first air pressure sensor and a second air pressure sensor for detecting the air pressures on both sides of the grid plate and outputting a first air pressure detection signal and a second air pressure detection signal; a main controller which, in the valve open state, obtains the flow velocity value inside the ventilation pipeline according to the first air pressure detection signal, the second air pressure detection signal and the preset grid plate area, and outputs an abnormal feedback signal when it detects overpressure, underpressure or overcurrent in the gas pipeline; the main controller starts timing when the valve is closed, stops timing when the internal air pressure value of the ventilation pipeline is lower than the preset safety value, and outputs a prompt signal when the timing time is greater than the preset time; a wireless communication circuit outputs the abnormal feedback signal or the prompt signal to a terminal server. The present invention solves the problem of low overall safety of the gas system.

Description

Technical Field

[0001] The present invention relates to the field of gas pipeline detection, and in particular to an emergency shut-off valve, a gas pipeline system and a pipeline internal state detection method. Background Art

[0002] A self-closing valve is a device installed on the pipeline of a low-pressure gas system. When the pipeline gas supply pressure is under-pressure or over-pressure, it can automatically close and must be opened manually without electricity or other external power. The traditional self-closing valve is a multi-pole permanent magnetic linkage mechanism that magnetizes permanent magnetic materials according to design requirements to identify changes in gas pressure parameters passing through it. When the safety setting value is exceeded, the valve is automatically closed to cut off the gas source. This self-closing valve is fully mechanical and will automatically close the valve when it is under-pressure, over-pressure or over-current, but the gas company cannot know the reason for the closure and cannot take corresponding measures based on the reason for the valve closure. In addition, users will close the valve when they do not need to use gas. The self-closing valve cannot detect whether there is a leak when the valve is closed. It can only be detected by installing a gas alarm. When the gas alarm detects that the gas concentration reaches the critical point set by the explosion or poisoning alarm, the gas alarm will send an alarm signal to remind the staff to take safety measures. However, when the leaked gas is small, the gas alarm may not be able to detect accurately due to air circulation; it cannot alarm when there is only a slight leak of gas in the gas pipeline, and the detection sensitivity is low. This results in low overall safety of the gas system. Summary of the invention

[0003] The main purpose of the present invention is to provide an emergency shut-off valve, a gas pipeline system and a method for detecting the state in the pipeline, aiming to solve the problem of low safety of the gas system as a whole.

[0004] To achieve the above object, the present invention provides an emergency shut-off valve, which is applied to a gas pipeline system. The emergency shut-off valve comprises:

[0005] A ventilation pipeline, wherein the ventilation pipeline is arranged in series at the air inlet end and the air outlet end of the gas pipeline;

[0006] A grille plate, wherein the grille plate is arranged inside the ventilation duct;

[0007] A first air pressure sensor and a second air pressure sensor are respectively arranged on both sides of the grille plate; the first air pressure sensor is used to detect the air pressure on the side of the ventilation duct close to the air inlet end, and output a first air pressure detection signal; the second air pressure sensor is used to detect the air pressure on the side of the ventilation duct close to the air outlet end, and output a second air pressure detection signal;

[0008] A main controller, the input ends of the main controller are respectively connected to the output ends of the first air pressure sensor and the second air pressure sensor; the main controller is configured to, when receiving a valve opening signal of an emergency cut-off valve, obtain the first air pressure detection signal and the second air pressure detection signal, and when detecting overpressure, underpressure or overcurrent in the gas pipeline according to the first air pressure detection signal, the second air pressure detection signal and the area of the preset grille plate to obtain the flow velocity value in the ventilation pipeline, output a corresponding abnormal feedback signal;

[0009] The main controller is further configured to start timing when receiving a valve closing signal of the emergency cut-off valve, stop timing when the internal air pressure value of the ventilation pipeline is lower than a preset safety value according to the first air pressure detection signal or the second air pressure detection signal, and output a prompt signal when the timing time is greater than a preset time;

[0010] A wireless communication circuit, the input end of the wireless communication circuit is connected to the output end of the main controller, and the wireless communication circuit is also in communication connection with a terminal server; the wireless communication circuit is configured to output the abnormal feedback signal or the prompt signal to the terminal server.

[0011] Optionally, the emergency cut-off valve further includes:

[0012] An electrically controlled valve body, the electrically controlled valve body is arranged outside the ventilation pipeline;

[0013] The output end of the main controller is connected to the controlled end of the electrically controlled valve body, and the main controller is further configured to control the electrically controlled valve body to cut off the connection between the intake end and the outlet end when detecting overpressure, underpressure or overcurrent in the gas pipeline and outputting a corresponding abnormal feedback signal.

[0014] Optionally, the main controller is further configured to output an alarm signal to the wireless communication circuit when the timing time is less than the preset time, and the wireless communication circuit is further configured to output the alarm signal to the terminal server.

[0015] Optionally, the wireless communication circuit includes:

[0016] A wireless communication chip, the input end of the wireless communication chip is connected to the output end of the main controller;

[0017] An antenna, the antenna is in communication connection with the wireless communication chip, and the antenna is used for communicating with the terminal server;

[0018] The wireless communication chip is configured to output the abnormal feedback signal, the prompt signal or the alarm signal to the terminal server through the antenna.

[0019] Optionally, the emergency cut-off valve further includes:

[0020] A housing disposed outside the ventilation pipeline, and the housing forms a receiving cavity;

[0021] A circuit board accommodated in the receiving cavity, and the main controller and the wireless communication circuit are disposed on the circuit board.

[0022] Optionally, the housing includes:

[0023] An upper cover and a lower cover, the upper cover and the lower cover enclose to form the receiving cavity, and the upper cover and the lower cover are fixed by buckles;

[0024] The lower cover is fixed to the outside of the ventilation pipeline by screws.

[0025] The present invention also provides a gas pipeline system, which includes a gas pipeline and the emergency cut-off valve as described above, and the inlet end and the outlet end of the ventilation pipeline in the emergency cut-off valve are respectively connected to the gas pipeline.

[0026] The present invention also provides a method for detecting the state inside a pipeline, and the method for detecting the state inside the pipeline includes:

[0027] Step S100: When obtaining a valve opening instruction, obtain the air pressure values on both sides of the grille plate inside the ventilation pipeline;

[0028] Step S200: According to the air pressure values on both sides of the grille plate inside the ventilation pipeline and the preset area of the grille plate, obtain the flow velocity value inside the ventilation pipeline. When it is detected that the gas pipeline is overpressure, underpressure or overcurrent, output a corresponding abnormal feedback signal;

[0029] Step S300: When obtaining a valve closing instruction, start timing and detect the internal air pressure value of the gas pipeline;

[0030] Step S400: Stop timing when the detected internal air pressure value of the pipeline is less than the preset safety value, and output a prompt signal when the timing time is greater than the preset time;

[0031] Step S500: Output the abnormal feedback signal or the prompt signal to the terminal server.

[0032] Optionally, step S200 is specifically:

[0033] Step S210: When the air pressure value on any one side of the two sides of the grille plate inside the ventilation pipeline is less than the first preset air pressure value, output an abnormal feedback signal corresponding to underpressure;

[0034] Step S220: When the air pressure value on either side of the grille plate in the ventilation pipeline is greater than the second preset air pressure value, an abnormal feedback signal corresponding to overpressure is output.

[0035] Step S230: When the flow velocity value is greater than the preset flow velocity value, an abnormal feedback signal corresponding to overcurrent is output.

[0036] Optionally, step S400 is specifically:

[0037] Step S510: Compare the timing time with the preset time.

[0038] Step S520: When the timing time is less than the preset time, an alarm signal is output.

[0039] The technical solution of the present invention adopts a ventilation pipeline, a grille plate, a first air pressure sensor, a second air pressure sensor, a main controller and a wireless communication circuit. The first air pressure sensor and the second air pressure sensor detect the air pressure conditions on both sides of the grille plate in the ventilation pipeline, and output corresponding first air pressure detection signals and second air pressure detection signals to the main controller. The main controller obtains the flow velocity value in the ventilation pipeline according to the first air pressure detection signal, the second air pressure detection signal and the preset area of the grille plate. When it detects that the gas pipeline is overpressured, underpressured or overcurrent, it outputs corresponding abnormal feedback signals and outputs the abnormal feedback signals to the wireless communication circuit. The main controller can also start timing when receiving the valve closing signal of the emergency cut-off valve, stop timing when the internal air pressure value of the pipeline obtained according to the air pressure detection signal is lower than the preset safety value, and output a prompt signal to the wireless communication circuit when the timing time is greater than the preset time. The wireless communication circuit then outputs the abnormal feedback signal or the prompt signal to the terminal server, enabling the staff to know the reason for the valve closing of the cut-off valve in the gas pipeline during normal operation and whether there is a slight leakage in the gas pipeline when the gas is not in use, improving the overall safety of the gas system. The present invention solves the problem of low overall safety of the gas system. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0041] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the emergency cut-off valve of the present invention;

[0042] Figure 2 It is a schematic functional module diagram of an embodiment of the gas pipeline system of the present invention;

[0043] Figure 3 This is a flowchart of the method steps of an embodiment of the method for detecting the state inside the pipeline of the present invention;

[0044] Figure 4 This is a flowchart of the method steps of another embodiment of the method for detecting the state inside the pipeline of the present invention;

[0045] Figure 5 This is a flowchart of the method steps of yet another embodiment of the method for detecting the state inside the pipeline of the present invention.

[0046] Explanation of the reference numerals in the drawings:

[0047] Label Name Label Name 10 Vent pipe 51 Upper cover 20 Grid plate 52 Lower cover 30 First air pressure sensor 60 Electric control valve body 40 Second air pressure sensor 100 Emergency cut-off valve 50 Shell 110 Gas pipeline

[0048] The realization of the object of the present invention, functional features and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0050] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] A self-closing valve is a device installed on the pipeline of a low-pressure gas system. When the pipeline gas supply pressure is under-pressure or over-pressure, it can automatically close and must be opened manually without electricity or other external power. The traditional self-closing valve is a multi-pole permanent magnetic linkage mechanism that magnetizes permanent magnetic materials according to design requirements to identify changes in gas pressure parameters passing through it. When the safety setting value is exceeded, the valve is automatically closed to cut off the gas source. This self-closing valve is fully mechanical and will automatically close the valve when it is under-pressure, over-pressure or over-current, but the gas company cannot know the reason for the closure and cannot take corresponding measures based on the reason for the valve closure. In addition, users will close the valve when they do not need to use gas. The self-closing valve cannot detect whether there is a leak when the valve is closed. It can only be detected by installing a gas alarm. When the gas alarm detects that the gas concentration reaches the critical point set by the explosion or poisoning alarm, the gas alarm will send an alarm signal to remind the staff to take safety measures. However, when the leaked gas is small, the gas alarm may not be able to detect accurately due to air circulation; it cannot alarm when there is only a slight leak of gas in the gas pipeline, and the detection sensitivity is low. This results in low overall safety of the gas system.

[0053] The present invention provides an emergency shut-off valve 100 .

[0054] Reference Figure 1 In one embodiment of the present invention, the emergency shut-off valve 100 is applied to a gas pipeline 110 system, and the emergency shut-off valve 100 includes:

[0055] A ventilation pipe 10, wherein the ventilation pipe 10 is arranged in series at the air inlet end and the air outlet end of the gas pipe 110;

[0056] A grille plate 20, wherein the grille plate 20 is disposed inside the ventilation duct 10;

[0057] The first air pressure sensor 30 and the second air pressure sensor 40 are respectively arranged on both sides of the grille plate 20; the first air pressure sensor 30 is used to detect the air pressure on the side of the ventilation duct 10 close to the air inlet end, and output a first air pressure detection signal; the second air pressure sensor 40 is used to detect the air pressure on the side of the ventilation duct 10 close to the air outlet end, and output a second air pressure detection signal;

[0058] A main controller, wherein the input end of the main controller is connected to the output end of the first air pressure sensor 30 and the output end of the second air pressure sensor 40 respectively; the main controller is used to obtain the flow rate value in the ventilation pipe 10 according to the first air pressure detection signal, the second air pressure detection signal and the preset area of ​​the grille plate 20, and output a corresponding abnormal feedback signal when detecting that the gas pipeline 110 is over-pressure, under-pressure or over-current;

[0059] The main controller is further configured to start timing when receiving a valve closing signal of the emergency cut-off valve 100, stop timing when the internal air pressure value of the ventilation pipe 10 is lower than a preset safety value according to the first air pressure detection signal or the second air pressure detection signal, and output a prompt signal when the timing time is greater than a preset time;

[0060] A wireless communication circuit, the input end of the wireless communication circuit is connected to the output end of the main controller, and the wireless communication circuit is also communicatively connected to a terminal server; the wireless communication circuit is configured to output the abnormal feedback signal or the prompt signal to the terminal server.

[0061] In this embodiment, the gas in the gas pipeline 110, such as natural gas, artificial gas, liquefied petroleum gas, biogas, coal gasification gas and other gases, enters the inside of the ventilation pipe 10. After passing through the grille plate 20 with a wind resistance effect, a pressure difference will be generated between the internal air pressure of the ventilation pipe 10 on the side of the grille plate 20 close to the intake end of the ventilation pipe 10 and the internal air pressure of the ventilation pipe 10 on the side of the grille plate 20 close to the outlet end of the ventilation pipe 10; the first air pressure sensor 30 and the second air pressure sensor 40 can respectively detect the internal air pressure of the ventilation pipe 10 on the side of the grille plate 20 close to the intake end of the ventilation pipe 10 and the internal air pressure of the ventilation pipe 10 on the side of the grille plate 20 close to the outlet end of the ventilation pipe 10, and output corresponding first air pressure detection signals and second air pressure detection signals to the main controller; in this embodiment, the main controller can be a digital signal processor (DSP for short), a programmable logic device (PLD for short), a field programmable gate array (FPGA for short), a controller, a microcontroller, a microprocessor, an MCU single-chip microcomputer or other electronic components; the main controller can obtain the pressure difference generated by the gas passing through the grille plate 20 according to the first air pressure detection signal and the second air pressure detection signal; and the cross-sectional area of the grille plate 20 is preset in the main controller, so the main controller can obtain the current gas flow velocity value inside the ventilation pipe 10 according to the gas flow velocity calculation formula.

[0062] It can be understood that the main controller will obtain the air pressure situation in the ventilation pipeline 10 based on the first air pressure detection signal and the second air pressure detection signal. The main controller can convert the first air pressure detection signal and the second air pressure detection signal into corresponding pressure values. A range of safety pressure values and a range of safety flow velocity values are preset in the main controller. A comparator can be provided in the main controller. The comparator can compare the real-time pressure value and flow velocity value with the preset range of safety pressure values or the range of safety flow velocity values, and make the main controller output a corresponding abnormal feedback signal according to the comparison result; when the pressure value represented by the first air pressure detection signal or the second air pressure detection signal is less than the range of safety pressure values, the main controller will output an abnormal feedback signal representing underpressure to the wireless communication circuit; when the pressure value represented by the first air pressure detection signal or the second air pressure detection signal is greater than the range of safety pressure values, the main controller will output an abnormal feedback signal representing overpressure to the wireless communication circuit.

[0063] In actual application, a mapping table between the cross-sectional area of the grille plate 20, the first air pressure detection signal, the second air pressure detection signal, and the flow velocity can be established and stored in the main controller. When the main controller receives the first air pressure detection signal and the second air pressure detection signal, it can determine the flow velocity according to the first air pressure detection signal and the second air pressure detection signal.

[0064] Specifically, according to the ideal gas pressure formula: pv = nrt, where p is the gas pressure in the ventilation pipeline 10, v is the gas volume, n is the number of moles of gas, r is the gas constant, and t is the thermodynamic temperature; the main controller can obtain the gas volume passing through the grille plate 20 through the first air pressure detection signal and the second air pressure detection signal; then according to the gas flow velocity formula: flow velocity = V / (T*S), where V is the gas volume passing through the grille plate 20 per unit time, T is the unit time, and S is the cross-sectional area of the grille plate 20, the main controller can obtain the flow velocity value of the gas in the ventilation pipeline 10.

[0065] In summary, the cross-sectional area of the grille plate 20 is a fixed value. According to the gas pressure and the gas volume of the grille plate 20, the gas flow velocity can be calculated, and then the flow velocity can be determined according to the first air pressure detection signal and the second air pressure detection signal.

[0066] When the main controller determines overcurrent according to the first air pressure detection signal and the second air pressure detection signal through table lookup and the comparator, the main controller outputs an abnormal feedback signal representing overcurrent to the wireless communication circuit. The specific safety value range can be set when the emergency cut-off valve 100 leaves the factory. Because there are many types of fuels and the pressures and flow velocities of different gases are different, corresponding settings are required.

[0067] Further, when the user does not need to use the gas, the valve of the emergency cut-off valve 100 can be closed to output a valve closed signal. The main controller starts timing when it receives the valve closed signal and stops timing when the internal air pressure value of the ventilation pipe 10 obtained according to the air pressure detection signal is lower than the preset safety value, that is, the range of the above-mentioned safety pressure value. The comparator can also compare the timing time with the preset time. When the timing time is greater than the preset time, the main controller outputs a prompt signal. The preset time can be set to 30 minutes. When the internal air pressure value of the ventilation pipe 10 is lower than the preset safety value only after more than 30 minutes, it proves that there is only a slight leakage, and the rubber hose or the cooking appliance needs to be maintained. The specific preset time can be set according to the actual situation, and this solution does not make any restrictions. In this embodiment, the user can manually close the valve of the emergency cut-off valve 100, and after the valve is closed, a valve closed signal will be output to the main controller. A preset time point can also be set, such as 1:00 am or 2:00 am, etc. At the preset time point, the valve of the emergency cut-off valve 100 is automatically closed, and a valve closed signal is output to the main controller.

[0068] The wireless communication circuit adopts wireless communication technology, which can be communication technologies such as 4G / 5G. Wireless communication is a communication method that uses the characteristic that electromagnetic wave signals can propagate in free space to exchange information. The wireless communication circuit can output an abnormal feedback signal or a prompt signal representing undervoltage, overvoltage or overcurrent to the terminal server. The terminal server can be the cloud server of the gas company. The staff of the gas company can know the situation inside the gas pipeline 110 when the user is using gas according to the abnormal feedback signal, and know the specific abnormal reason when the gas situation inside the gas pipeline 110 is abnormal. If it is overvoltage or undervoltage, the gas company only needs to adjust the pressure value inside the gas pipeline 110. If it is overcurrent, it may represent a leakage of the gas pipeline 110, and the risk factor is relatively high, and maintenance personnel need to be sent immediately for maintenance. Because the air pressure value inside the gas pipeline 110 will also be lower when the flow rate is too fast, it is impossible to judge whether the gas pipeline 110 is not ventilated or overcurrent only based on the air pressure value. Therefore, it is necessary to measure the gas flow rate value inside the gas pipeline 110. It can also know whether there is a slight leakage of gas when the user does not use gas according to the prompt signal.

[0069] The technical solution of the present invention is to adopt an air vent pipe 10, a grille plate 20, a first air pressure sensor 30, a second air pressure sensor 40, a main controller and a wireless communication circuit. The first air pressure sensor 30 and the second air pressure sensor 40 detect the air pressure conditions on both sides of the grille plate 20 in the air vent pipe 10, and output corresponding first air pressure detection signals and second air pressure detection signals to the main controller, so that the main controller obtains the flow velocity value in the air vent pipe 10 according to the first air pressure detection signal, the second air pressure detection signal and the preset area of the grille plate 20. When it is detected that the gas pipeline 110 is overpressure, underpressure or overcurrent, an abnormal feedback signal is output, and the abnormal feedback signal is output to the wireless communication circuit; the main controller can also start timing when receiving the valve closing signal of the emergency cut-off valve 100, stop timing when the internal air pressure value of the pipeline is lower than the preset safety value according to the air pressure detection signal, and output a prompt signal to the wireless communication circuit when the timing time is greater than the preset time; the wireless communication circuit then outputs the abnormal feedback signal or the prompt signal to the terminal server; enabling the staff to know the reason for the valve closing of the cut-off valve in the gas pipeline 110 during normal operation; and whether there is a slight leakage in the gas pipeline 110 when the gas is not in use. The safety of the overall gas system is improved. The present invention solves the problem of low overall safety of the gas system.

[0070] Referring to Figure 1 , in an embodiment, the emergency cut-off valve 100 further includes:

[0071] An electric control valve body 60, the electric control valve body 60 is arranged outside the air vent pipe 10;

[0072] The output end of the main controller is connected to the controlled end of the electric control valve body 60, and the main controller is further used for controlling the electric control valve body 60 to cut off the connection between the air inlet end and the air outlet end when detecting that the gas pipeline 110 is overpressure, underpressure or overcurrent and outputting a corresponding abnormal feedback signal.

[0073] In this embodiment, the electric control valve body 60 and the ventilation pipeline 10 can be fixedly connected by threaded connection. The electric control valve body 60 can be an electromagnetic valve. An electromagnetic valve is an industrial device controlled by electricity. It is a basic automation component for controlling fluids and belongs to an actuator, not limited to hydraulic or pneumatic applications. It is used in industrial control systems to adjust parameters such as the direction, flow rate, speed, and other parameters of the medium. The electromagnetic valve can cooperate with different circuits to achieve the expected control, and both the control accuracy and flexibility can be guaranteed. The main controller can control the electric control valve body 60 to cut off the connection between the intake end and the outlet end when detecting overpressure, underpressure, or overcurrent in the gas pipeline 110. By setting the electric control valve body 60 in this embodiment, when the main controller detects overpressure, underpressure, or overcurrent in the gas pipeline 110 and outputs a corresponding abnormal feedback signal, it can control the electric control valve body 60 to cut off the connection between the intake end and the outlet end to protect the safety of users.

[0074] In one embodiment, the main controller is further configured to output an alarm signal to the wireless communication circuit when the timing time is less than the preset time, and the wireless communication circuit is further configured to output the alarm signal to the terminal server.

[0075] In this embodiment, if the preset time is 30 minutes and the internal air pressure value of the gas pipeline 110 is lower than the preset safety value within the preset time, it proves that the leakage situation is relatively serious and the rubber hose or stove needs to be replaced; if the internal air pressure value of the gas pipeline 110 is lower than the preset safety value within 10 minutes, it proves that the concentration of the leaked gas has reached the explosion concentration, which may pose a threat to the personal safety of users and the users need to evacuate. This embodiment can output an alarm signal to the terminal server when the gas leakage is serious, enabling the staff to estimate in advance whether to maintain the gas pipeline 110 system of the users.

[0076] In one embodiment, the wireless communication circuit includes:

[0077] A wireless communication chip, the input end of the wireless communication chip is connected to the output end of the main controller;

[0078] An antenna, the antenna is communicatively connected to the wireless communication chip, and the antenna is used to communicate with the terminal server;

[0079] The wireless communication chip is configured to output the abnormal feedback signal, the prompt signal, or the alarm signal to the terminal server through the antenna.

[0080] In this embodiment, the wireless communication chip adopts wireless communication technology. Wireless communication is a communication method that uses the characteristic that electromagnetic wave signals can propagate in free space to exchange information. The wireless communication chip can communicate with the terminal server in ways such as 4G / 5G; functions of the wireless communication chip: The radio frequency chip is a wireless transmitting chip. When discrete components are used, it only performs simple modulation and transmission. As a complete chip, it undertakes complex functions such as input, reception, temporary storage, packaging, power adjustment, and speed adjustment of data. An antenna is a transducer that converts the guided wave propagating on the transmission line into an electromagnetic wave propagating in the unbounded medium, or performs the opposite conversion; it is a component used to transmit or receive electromagnetic waves in radio equipment. Therefore, the wireless communication chip can output the abnormal feedback signal, prompt signal, or alarm signal output by the main controller to the terminal server through the antenna. In this embodiment, the wireless communication circuit composed of the wireless communication chip and the antenna can output the abnormal feedback signal or prompt signal output by the main controller to the terminal server.

[0081] Referring to Figure 1 , in one embodiment, the emergency cut-off valve 100 further includes:

[0082] A housing 50, the housing 50 is disposed outside the ventilation duct 10, and the housing 50 forms a receiving cavity;

[0083] A circuit board, the circuit board is received in the receiving cavity, and the main controller and the wireless communication circuit are disposed on the circuit board.

[0084] In this embodiment, the housing 50 is used to fix the positional relationship of the circuit board, ensuring the safety and stability inside the receiving cavity formed by the housing 50 of the emergency cut-off valve 100. When the emergency cut-off valve 100 is working, the positional relationship of the circuit board will not change, and external gases or objects cannot fall on the circuit board, affecting the operation of the main controller and the wireless communication circuit on the circuit board. The antenna in the wireless communication circuit can also be disposed on the surface of the housing 50; the housing 50 also has a protection effect on the outside of the emergency cut-off valve 100. The housing 50 mainly resists external loads with the mid-plane stress uniformly distributed along the thickness, rather than the bending stress varying along the thickness, and has a better load-bearing effect on external forces. In this embodiment, the receiving cavity formed by the housing 50 can fix the position of the circuit board and protect the main controller and the wireless communication circuit on the circuit board from the external environment.

[0085] Referring to Figure 1 , in one embodiment, the housing 50 includes:

[0086] An upper cover 51 and a lower cover 52, the upper cover 51 and the lower cover 52 enclose to form the receiving cavity, and the upper cover 51 and the lower cover 52 are fixed by buckles;

[0087] The lower cover 52 is fixed to the outside of the ventilation duct 10 by screws.

[0088] In this embodiment, the housing 50 is composed of an upper cover 51 and a lower cover 52. The lower cover 52 is fixed to the pipeline by screws. The upper cover 51 and the lower cover 52 are fixed in a snap-fit manner, and the housing 50 is potted to meet the explosion-proof requirements. Fixing the lower cover 52 to the outside of the ventilation duct 10 by screws can prevent the entire housing 50 from easily detaching from the ventilation duct 10; fixing the upper cover 51 and the lower cover 52 by snap-fits facilitates maintenance personnel or debugging personnel to open it for maintaining or debugging the main controller or wireless communication circuit on the circuit board in the housing 50.

[0089] The present invention also proposes a gas pipeline 110 system.

[0090] Refer to Figure 2 , in an embodiment, the gas pipeline 110 system includes a gas pipeline 110 and the emergency cut-off valve 100 as described above. The inlet end and the outlet end of the ventilation duct 10 in the emergency cut-off valve 100 are respectively connected to the gas pipeline 110. For the specific structure of the emergency cut-off valve 100, refer to the above embodiment. Since this gas pipeline 110 system adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0091] The present invention also proposes a method for detecting the state inside a pipeline.

[0092] Refer to Figure 3 , in an embodiment, the method for detecting the state inside a pipeline includes:

[0093] Step S100: When obtaining a valve opening instruction, obtain the air pressure values on both sides of the grid plate 20 inside the ventilation duct 10;

[0094] Step S200: According to the air pressure values on both sides of the grid plate 20 inside the ventilation duct 10 and the preset area of the grid plate 20, obtain the flow velocity value inside the ventilation duct 10. When it is detected that the gas pipeline 110 is overpressure, underpressure or overcurrent, output a corresponding abnormal feedback signal;

[0095] Step S300: When obtaining a valve closing instruction, start timing and detect the internal air pressure value of the gas pipeline 110;

[0096] Step S400: Stop timing when the detected internal air pressure value of the pipeline is less than the preset safety value, and output a prompt signal when the timing time is greater than the preset time;

[0097] Step S500: Output the abnormal feedback signal or the prompt signal to the terminal server.

[0098] In this embodiment, when the user is using gas normally, that is, when the valve opening instruction is obtained, the air pressure values on both sides of the grille plate 20 in the ventilation pipeline 10 can be detected by two air pressure sensors respectively. According to the air pressure values on both sides of the grille plate 20 in the ventilation pipeline 10 and the preset area of the grille plate 20, the flow velocity value in the ventilation pipeline 10 is obtained. When it is detected that the gas pipeline 110 is overpressure, underpressure or overcurrent, a corresponding abnormal feedback signal is output to the terminal server. Specifically, according to the ideal gas pressure formula: pv = nrt, where p is the gas pressure in the ventilation pipeline 10, v is the gas volume, n is the number of moles of gas, r is the gas constant, and t is the thermodynamic temperature; the gas volume passing through the grille plate 20 can be obtained through the first air pressure detection signal and the second air pressure detection signal; and then according to the gas flow velocity formula: flow velocity = V / (T*S), where V is the gas volume passing through the grille plate 20 per unit time, T is the unit time, and S is the cross-sectional area of the grille plate 20, the flow velocity value of the gas in the ventilation pipeline 10 can be obtained.

[0099] After obtaining the valve closing instruction, start timing and detect the air pressure value in the gas pipeline 110. Stop timing when the detected internal air pressure value of the pipeline is less than the preset safety value, and output a prompt signal to the terminal server when the timing time is greater than the preset time; the preset time can be set to 30 minutes. When the internal air pressure value of the pipeline is lower than the preset safety value only after more than 30 minutes, it proves that there is only a slight leakage, and the rubber hose or stove needs to be maintained; if the internal air pressure value of the pipeline is lower than the preset safety value within 30 minutes, it proves that the leakage situation is relatively serious and the rubber hose or stove needs to be replaced; if the internal air pressure value of the pipeline is lower than the preset safety value within 10 minutes, it proves that the leakage situation is very serious and may threaten the personal safety of the user, and the user needs to evacuate. The terminal server can be the server of the gas company. After the staff of the gas company receives the prompt signal through the server, they can estimate in advance whether the equipment such as the rubber hose and stove in the user's home needs to be replaced according to the specific situation of the gas leakage, so as to avoid more serious leakage and danger.

[0100] In this embodiment, the flow velocity value in the ventilation pipeline 10 can be obtained by detecting the air pressure values on both sides of the grille plate 20 in the ventilation pipeline 10 and the preset area of the grille plate 20. When it is determined that the gas pipeline 110 is overpressure, underpressure or overcurrent according to the air pressure value and the flow velocity value, a corresponding abnormal feedback signal is output to the terminal server, so that the staff know the specific reason for the abnormal situation in the gas pipeline 110; it can also compare the internal air pressure value of the pipeline with the preset safety value after the valve is closed. When the internal air pressure value of the pipeline is less than the preset safety value, a prompt signal is output to the terminal server, so that the personnel of the gas company can know when there is a slight leakage in the gas pipeline 110 in the user's home, so as to take corresponding measures in time.

[0101] Refer toFigure 4 In one embodiment, step S200 is specifically as follows:

[0102] Step S210: When the air pressure value on either side of the grille plate 20 in the ventilation duct 10 is less than the first preset air pressure value, an abnormal feedback signal corresponding to underpressure is output.

[0103] Step S220: When the air pressure value on either side of the grille plate 20 in the ventilation duct 10 is greater than the second preset air pressure value, an abnormal feedback signal corresponding to overpressure is output.

[0104] Step S230: When the flow velocity value is greater than the preset flow velocity value, an abnormal feedback signal corresponding to overcurrent is output.

[0105] In this embodiment, when the air pressure value on either side of the grille plate 20 in the ventilation duct 10 is less than the first preset air pressure value, it proves that the air pressure in the gas pipeline 110 is too low, and then an abnormal feedback signal corresponding to underpressure is output to the terminal server; when the air pressure value on either side of the grille plate 20 in the ventilation duct 10 is greater than the second preset air pressure value, it proves that the air pressure in the gas pipeline 110 is too high, and then an abnormal feedback signal corresponding to overpressure is output to the terminal server; when the flow velocity value is greater than the preset flow velocity value, it proves that the flow velocity in the gas pipeline 110 is too fast, and then an abnormal feedback signal corresponding to overcurrent is output to the terminal server. In this embodiment, by judging the magnitudes of the air pressure value and the preset air pressure value, and the flow velocity value and the preset flow velocity value, the specific reasons for the abnormal conditions in the gas pipeline 110 can be obtained.

[0106] Refer to Figure 5 In one embodiment, step S500 is specifically as follows:

[0107] Step S410: Compare the timing time with the preset time.

[0108] Step S420: Output an alarm signal when the timing time is less than the preset time.

[0109] In this embodiment, within a period of time after the valve is closed, the timing time is compared with the preset time, such as three hours or four hours, etc., and the specific time can be set according to the actual situation of the user; because users generally have rest time at night, during this period, the air pressure condition in the gas pipeline 110 can be automatically detected. During this period, if the timing time is greater than the preset time, a prompt signal is output to the terminal server; if the timing time is less than the preset time, an alarm signal is output to the terminal server. In this embodiment, by comparing the timing time with the preset time, a prompt signal is output when the timing time is greater than the preset time, and an alarm signal is output when the timing time is less than the preset time, so that the gas pipeline 110 can be detected when the user is resting or away.

[0110] The above are only alternative embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present invention.

Claims

1. An emergency shut-off valve, applied to a gas pipeline system, characterized in that, The emergency cut-off valve includes: A ventilation pipeline, which is serially arranged at the inlet end and the outlet end of the gas pipeline; A grille plate, which is arranged inside the ventilation pipeline; A first air pressure sensor and a second air pressure sensor, which are respectively arranged on both sides of the grille plate; the first air pressure sensor is used to detect the air pressure on the side close to the inlet end in the ventilation pipeline and output a first air pressure detection signal; the second air pressure sensor is used to detect the air pressure on the side close to the outlet end in the ventilation pipeline and output a second air pressure detection signal; A main controller, the input ends of which are respectively connected to the output ends of the first air pressure sensor and the second air pressure sensor; the main controller is used to obtain the first air pressure detection signal and the second air pressure detection signal when receiving the valve opening signal of the emergency cut-off valve, and output a corresponding abnormal feedback signal when detecting overpressure, underpressure or overcurrent of the gas pipeline according to the first air pressure detection signal, the second air pressure detection signal and the preset area of the grille plate; The main controller is further used to start timing when receiving the valve closing signal of the emergency cut-off valve, stop timing when the internal air pressure value of the ventilation pipeline is lower than the preset safety value according to the first air pressure detection signal or the second air pressure detection signal, and output a prompt signal when the timing time is greater than the preset time; the main controller is also used to output an alarm signal to the wireless communication circuit when the timing time is less than the preset time; A wireless communication circuit, the input end of which is connected to the output end of the main controller, and the wireless communication circuit is also communicatively connected to the terminal server; the wireless communication circuit is used to output the abnormal feedback signal or the prompt signal to the terminal server; the wireless communication circuit is also used to output the alarm signal to the terminal server.

2. The emergency cut-off valve according to claim 1, characterized in that The emergency cut-off valve further includes: An electric control valve body, which is arranged outside the ventilation pipeline; The output end of the main controller is connected to the controlled end of the electric control valve body, and the main controller is also used to control the electric control valve body to cut off the connection between the inlet end and the outlet end when detecting overpressure, underpressure or overcurrent of the gas pipeline and output a corresponding abnormal feedback signal.

3. The emergency cut-off valve according to claim 1, characterized in that, The wireless communication circuit includes: A wireless communication chip, the input end of which is connected to the output end of the main controller; An antenna, which is communicatively connected to the wireless communication chip, and the antenna is used to communicate with the terminal server; The wireless communication chip is used to output the abnormal feedback signal, the prompt signal or the alarm signal to the terminal server through the antenna.

4. The emergency cut-off valve according to claim 1, characterized in that, The emergency cut-off valve further includes: A housing, which is arranged outside the ventilation pipeline, and the housing forms a receiving cavity; A circuit board, which is received in the receiving cavity, and the main controller and the wireless communication circuit are arranged on the circuit board.

5. The emergency cut-off valve according to claim 4, characterized in that, The housing includes: An upper cover and a lower cover, the upper cover and the lower cover enclose to form the receiving cavity, and the upper cover and the lower cover are fixed by buckles; The lower cover is fixed to the outside of the ventilation pipeline by screws.

6. A gas pipeline system, characterized in that, The gas pipeline system includes a gas pipeline and an emergency cut-off valve as described in any one of claims 1-5, and the intake end and the outlet end of the ventilation pipeline in the emergency cut-off valve are respectively connected to the gas pipeline.

7. A method for detecting the state inside a pipeline, which is applied to the emergency cut-off valve according to any one of claims 1-5, characterized in that, The method for detecting the state inside the pipeline includes: Step S100: When obtaining a valve opening instruction, obtain the air pressure values on both sides of the grille plate inside the ventilation pipeline; Step S200: Obtain the flow velocity value inside the ventilation pipeline according to the air pressure values on both sides of the grille plate inside the ventilation pipeline and the preset area of the grille plate, and output a corresponding abnormal feedback signal when it is detected that the gas pipeline is overpressure, underpressure or overcurrent; Step S300: When obtaining a valve closing instruction, start timing and detect the internal air pressure value of the gas pipeline; Step S400: Stop timing when the detected internal air pressure value of the pipeline is less than the preset safety value, and output a prompt signal when the timing time is greater than the preset time; Step S500: Output the abnormal feedback signal or the prompt signal to the terminal server.

8. The method for detecting the state inside a pipeline according to claim 7, characterized in that, The specific content of step S200 is as follows: Step S210: When the air pressure value on any one side of the grille plate inside the ventilation pipeline is less than the first preset air pressure value, output an abnormal feedback signal corresponding to underpressure; Step S220: When the air pressure value on any one side of the grille plate inside the ventilation pipeline is greater than the second preset air pressure value, output an abnormal feedback signal corresponding to overpressure; Step S230: When the flow velocity value is greater than the preset flow velocity value, output an abnormal feedback signal corresponding to overcurrent.

9. The method for detecting the state inside a pipeline according to claim 7, characterized in that, The specific content of step S400 is as follows: Step S410: Compare the timing time with the preset time; Step S420: Output an alarm signal when the timing time is less than the preset time.

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