Positive pressure explosion-proof gas chromatograph

Abstract

The utility model relates to a positive pressure explosion-proof gas chromatograph, which comprises a gas circuit chamber, an electrical chamber, an EPC chamber and a temperature control chamber, the electrical chamber, the EPC chamber and the temperature control chamber are filled with explosion-proof gas to form a positive pressure explosion-proof cavity, and box bodies of the electrical chamber, the EPC chamber, the temperature control chamber and the gas circuit chamber are mutually welded to form a whole. And sealing strips are arranged on respective box doors of the electrical chamber, the EPC chamber, the temperature control chamber and the gas circuit chamber so as to seal the respective box doors of the electrical chamber, the EPC chamber, the temperature control chamber and the gas circuit chamber. According to the scheme, the box bodies of all the chambers of the gas chromatograph are welded together, so that the connection is more stable and is not easy to loosen, and holes do not need to be punched on the box bodies, so that the positive pressure environment in the chambers can be prevented from being influenced by gas leakage. In addition, the workload of welding connection is small, and the production efficiency is higher. And the sealing strips are arranged, so that the sealing performance of each chamber can be ensured, and the explosion-proof safety of each chamber is improved.

Description

Technical Field

[0001] This utility model generally relates to the field of explosion-proof equipment technology. More specifically, this utility model relates to a positive pressure explosion-proof gas chromatograph. Background Technology

[0002] In large-scale, modern petrochemical, steel, and coal enterprises, explosive hazardous materials are present due to the storage, transportation, production, processing, and handling of these materials. The analytical instruments used on-site in these enterprises need to meet explosion-proof requirements. Generally, to improve the explosion-proof level, on-site monitoring equipment is placed in explosion-proof cabinets. While this meets the on-site explosion-proof requirements, its use is limited due to low integration and complex on-site operation and debugging.

[0003] Currently, gas chromatography is used for qualitative and quantitative analysis of complex mixtures with multiple components. Depending on their function, these instruments consist of multiple chambers. The interconnections between the chambers make assembly difficult and production inefficient. Furthermore, to meet explosion-proof requirements, explosion-proof gas is typically filled into each chamber containing circuit boards and electrical components. However, the current interconnections between chambers cannot guarantee the airtightness of the chamber enclosures, easily leading to gas leaks and compromising their explosion-proof capabilities.

[0004] In view of this, there is an urgent need to provide a positive pressure explosion-proof gas chromatograph solution with a stable connection between the housings, higher assembly efficiency, and stronger sealing, thereby achieving higher explosion-proof safety. Utility Model Content

[0005] In order to solve at least one or more of the technical problems mentioned above, this utility model proposes a positive pressure explosion-proof gas chromatograph in several aspects.

[0006] In a first aspect, the present invention provides a positive pressure explosion-proof gas chromatograph, comprising a gas path chamber and an electrical chamber, an EPC chamber, and a temperature control chamber filled therein with explosion-proof gas to form a positive pressure explosion-proof chamber. The enclosures of the electrical chamber, EPC chamber, temperature control chamber, and gas path chamber are welded together to form a whole. Each enclosure door of the electrical chamber, EPC chamber, temperature control chamber, and gas path chamber is provided with a sealing strip to seal with its respective enclosure.

[0007] In one embodiment, the electrical chamber and the EPC chamber are connected to form an electrical positive pressure explosion-proof chamber, and the temperature control chamber separately forms a temperature-controlled positive pressure explosion-proof chamber. The gas chromatograph further includes a first explosion-proof positive pressure system for controlling the positive pressure environment of the electrical positive pressure explosion-proof chamber and a second explosion-proof positive pressure system for controlling the positive pressure environment of the temperature-controlled positive pressure explosion-proof chamber. The first explosion-proof positive pressure system includes an exhaust assembly and an exhaust port, the exhaust port being connected to the exhaust assembly. The exhaust assembly and the exhaust port are located on one side of the electrical chamber, and the exhaust port is connected to the outside of the electrical chamber. The second explosion-proof positive pressure system includes an exhaust assembly and an exhaust port, the exhaust port being connected to the exhaust assembly. The exhaust assembly and the exhaust port are located on the other side of the electrical chamber, and the exhaust port is connected to the outside of the electrical chamber.

[0008] In one embodiment, the exhaust assembly of the first explosion-proof positive pressure system includes a first pressure sensor that monitors the air pressure inside the electrical positive pressure explosion-proof chamber; the first explosion-proof positive pressure system further includes a first positive pressure control device electrically connected to the first pressure sensor and used to determine whether the air pressure inside the electrical positive pressure explosion-proof chamber reaches a safety threshold; the exhaust assembly of the second explosion-proof positive pressure system includes a second pressure sensor that monitors the air pressure inside the temperature-controlled positive pressure explosion-proof chamber; the second explosion-proof positive pressure system further includes a second positive pressure control device electrically connected to the second pressure sensor and used to determine whether the air pressure inside the temperature-controlled positive pressure explosion-proof chamber reaches a safety threshold; the first positive pressure control device and the second positive pressure control device are respectively disposed on both sides of the electrical chamber. In one embodiment, the first explosion-proof positive pressure system further includes an openable cover plate disposed outside the electrical chamber corresponding to its exhaust port; the second explosion-proof positive pressure system further includes an openable cover plate disposed outside the electrical chamber corresponding to its exhaust port.

[0009] In one embodiment, the electrical compartment and the EPC compartment are connected by at least one connecting pipe, and the end of the connecting pipe extending out of the electrical compartment and the EPC compartment is threaded. A sealing ring is provided on the outside of a nut that mates with the threaded part to seal the connection between the connecting pipe and the electrical compartment and the EPC compartment, respectively.

[0010] In one embodiment, the gas path chamber is arranged between the electrical chamber and the temperature control chamber, the temperature control chamber including detectors for detecting the components separated from the gas sample to be tested, and the signal lines of the detectors enter the electrical chamber through the gas path chamber to connect with the control module in the electrical chamber.

[0011] In one embodiment, the temperature control chamber includes an inner box and an outer box, with a cavity between the inner box and the outer box, and the cavity is filled with insulation cotton; the temperature control chamber door includes an inner cover and an outer cover, with a cavity between the inner cover and the outer cover, and the cavity is filled with insulation cotton.

[0012] In one embodiment, the gas chromatograph further includes a cavity disposed below the integral structure formed by welding the enclosures of the electrical chamber, EPC chamber, temperature control chamber, and gas path chamber.

[0013] In one embodiment, mounting ears are provided on the integral structure formed by welding the enclosures of the electrical compartment, EPC compartment, temperature control compartment, and gas circuit compartment.

[0014] In one embodiment, the gas chromatograph includes a plurality of mounting ears arranged symmetrically on the overall structure.

[0015] In summary, compared with existing technologies, the technical solution conceived in this invention, by welding the chambers of the gas chromatograph together, provides a more stable and less prone-to-loose connection compared to bolted connections. Furthermore, it eliminates the need for drilling holes in the chambers, preventing gas leakage and thus maintaining the positive pressure environment within the chambers. In addition, welding requires less work and is more efficient than bolted connections. The installation of sealing strips ensures the airtightness of each chamber, preventing external flammable gases from entering and improving the explosion-proof safety of each chamber. Attached Figure Description

[0016] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0017] Figure 1 An exemplary structural diagram of a positive pressure explosion-proof gas chromatograph according to an embodiment of the present invention is shown;

[0018] Figure 2 It shows Figure 1 Front view of the internal structure of a positive pressure explosion-proof gas chromatograph;

[0019] Figure 3 A cross-sectional view of the installation of a screw-cylindrical lock according to an embodiment of the present invention is shown;

[0020] Figure 4 A front view showing the detailed internal structure of a positive pressure explosion-proof gas chromatograph according to an embodiment of the present invention is shown.

[0021] Figure 5 It shows Figure 4 Rear view of a gas chromatograph;

[0022] Figure 6 It shows Figure 4Left view of the internal structure of a positive pressure explosion-proof gas chromatograph. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] Figure 1 An exemplary structural diagram of a positive pressure explosion-proof gas chromatograph 100 according to an embodiment of the present invention is shown. Figure 2 It shows Figure 1 Front view of the internal structure of the positive pressure explosion-proof gas chromatograph 100. Figure 2 Only a portion of the electrical modules inside the electrical room are shown.

[0026] like Figure 1 and Figure 2 As shown, the gas chromatograph 100 may include a gas path chamber 104 and an electrical chamber 101, an EPC chamber 102, and a temperature control chamber 103 filled with explosion-proof gas to form a positive pressure explosion-proof chamber. The enclosures of the electrical chamber 101, EPC chamber 102, temperature control chamber 103, and gas path chamber 104 are welded together to form a whole. Each of the enclosure doors of the electrical chamber 101, EPC chamber 102, temperature control chamber 103, and gas path chamber 104 is provided with a sealing strip to seal with its respective enclosure.

[0027] Positive pressure explosion protection refers to introducing fresh air or inert gas at a certain pressure into the casing of equipment (gas chromatograph) to prevent surrounding flammable gases from entering the casing, thereby preventing the ignition source from coming into contact with the explosive gas and achieving the purpose of preventing an explosion. Therefore, the explosion-proof gas mentioned above can be clean and safe compressed air or inert gases such as nitrogen and helium.

[0028] The electrical compartment 101 typically houses circuit boards and various electrical modules, such as power supply modules, control modules, signal conditioning modules, and data acquisition and analysis modules. EPC refers to the automatic pressure and flow control technology achieved through a computer using electronic pressure sensors and electronic flow controllers. The EPC compartment 102 houses the EPC module and solenoid valves used to implement this automatic control technology. The temperature control compartment 103 houses the sample introduction device for the gas sample to be analyzed, a color temperature column, filters, heating modules, and detection modules for component separation and analysis of the gas sample. The gas path compartment 104 houses the gas path module, which may include providing various gases required by the gas chromatograph (e.g., the gas sample to be analyzed, auxiliary gas, and explosion-proof gas).

[0029] like Figure 1 and Figure 2 As shown, the electrical chamber 101, EPC chamber 102, temperature control chamber 103, and gas passage chamber 104 form a three-layer structure. The EPC chamber 102 and temperature control chamber 103 are located on the lower layer, arranged side-by-side, and their enclosures are welded together. The gas passage chamber 104 is located above the side-by-side EPC chamber 102 and temperature control chamber 103, and its enclosure is welded to the enclosures of the EPC chamber 102 and temperature control chamber 103. The electrical chamber 101 is located above the gas passage chamber 104, and its enclosure is welded to the enclosure of the gas passage chamber 104. Welding, compared to bolting, provides a more secure connection between these enclosures, preventing loosening and eliminating the need for drilling holes in the enclosures, thus preventing air leakage and ensuring a positive pressure environment within the chambers. Furthermore, welding requires less work and is more efficient than bolting.

[0030] To facilitate operation of the components inside the electrical compartment 101, EPC compartment 102, temperature control compartment 103, and pneumatic compartment 104, in one embodiment, each of these compartments includes a housing and a door, which are hinged together and locked with a screw-type cylindrical lock. Figure 2As shown, the enclosure 1012 and door 1011 of the electrical compartment 101 are hinged together and locked by the upper and lower screw cylindrical locks 1013 of the door 1011; the enclosure 1022 and door 1021 of the EPC compartment 102 are hinged together and locked by the upper and lower screw cylindrical locks 1023 of the door 1021; the enclosure 1032 and door 1031 of the temperature control compartment 103 are hinged together and locked by the upper and lower screw cylindrical locks 1033 of the door 1031; the enclosure 1042 and door 1041 of the gas passage compartment 104 are hinged together and locked by the screw cylindrical lock 1043 in the middle of the door 1041. In one embodiment, the enclosures of the electrical compartment 101, EPC compartment 102, temperature control compartment 103, and gas circuit compartment 104 can be metal enclosures.

[0031] Installing two screw-type cylindrical locks on the doors of the electrical compartment 101, EPC compartment 102, and temperature control compartment 103 ensures a tight connection between the door and the enclosure at all locations, thereby improving the overall sealing of the enclosure. In other embodiments, only one screw-type cylindrical lock may be installed on the doors of the electrical compartment 101, EPC compartment 102, and temperature control compartment 103, which can be located at one end (top or bottom) or in the middle of the door.

[0032] The thickness of the gas passage chamber 104 is usually small, so a single screw-cylindrical lock can achieve a tight seal between the door 1041 and the chamber 1042. It is understood that the screw-cylindrical lock can also be installed at other locations on the door 1041, such as the upper or lower end; this embodiment does not impose any limitations on this.

[0033] The structure of the screw-cylindrical locks in electrical compartment 101, EPC compartment 102, temperature control compartment 103, and pneumatic compartment 104, as well as their connection relationship with the cabinet doors, can be the same. The following describes the process in conjunction with... Figure 3 Let's explain it. Figure 3 A cross-sectional view of the screw cylindrical lock 311 according to an embodiment of the present invention is shown, wherein the screw cylindrical lock 311 is shown in the dashed box.

[0034] like Figure 3As shown, the screw-type cylindrical lock 311 includes a screw. In use, an internal thread is provided on the housing, and a lock hole is provided on the door. When locking the door and housing, the screw passes through the lock hole and is screwed into the internal thread of the housing to lock the housing and door securely. To unlock, the screw is rotated in the opposite direction. The screw has a certain length; the more turns it makes into the internal thread, the tighter the lock on the housing and door, more securely than a single 90-degree rotating latch. This improves the sealing of the housing and door, effectively ensuring a positive pressure environment within the cavity, preventing external explosive gases from entering the housing, and thus improving explosion-proof safety. The above describes a mechanical screw-type cylindrical lock. The principle of an electronic screw-type cylindrical lock is similar, except that the rotation of the screw is controlled by an electronic key or password input to achieve the opening and closing of the door.

[0035] To facilitate the regulation and pressure display of the explosion-proof gas supply, a pressure gauge and a pressure regulating valve (not shown in the figure) can be installed on the door 1041 of the gas passage chamber 104. The pressure regulating valve is used to regulate the intake (explosion-proof gas) pressure of the electrical chamber 101, EPC chamber 102, and temperature control chamber 103, and the pressure gauge displays the real-time pressure data of the gas entering the chamber. Installing the pressure gauge and pressure regulating valve on the door 1041 saves space inside the enclosure 1042, thereby facilitating the arrangement of the gas passage.

[0036] In one embodiment, the housing 1032 of the temperature control chamber 103 may include an inner chamber and an outer chamber, with a cavity between the inner and outer chambers, which may be filled with insulation cotton. Its door 1031 may include an inner cover and an outer cover, with a cavity between the inner and outer covers, which may be filled with insulation cotton. This design can improve the insulation effect of the temperature control chamber 103.

[0037] like Figure 2 As shown, a sealing strip 1018 is provided on the door 1011 of the electrical compartment 101 to seal it with its enclosure 1012; a sealing strip 1024 is provided on the door 1021 of the EPC compartment 102 to seal it with its enclosure 1022; a sealing strip 1038 is provided on the door 1031 of the temperature control compartment 103 to seal it with its enclosure 1032; and a sealing strip 1045 is provided on the door 1041 of the gas passage compartment 104 to seal it with its enclosure 1042. The sealing strips can be rubber sealing strips. The sealing strips ensure the airtightness of the electrical compartment 101, EPC compartment 102, temperature control compartment 103, and gas passage compartment 104, preventing external flammable gases from entering these compartments, thereby improving the explosion-proof safety of each compartment.

[0038] Typically, the pressure within the electrical chamber 101, EPC chamber 102, and temperature control chamber 103 should be slightly higher than the external ambient pressure to create a slightly positive pressure environment. This effectively prevents air (flammable gases) containing potentially explosive gases or dust from entering the gas chromatograph. Since both the electrical chamber 101 and EPC chamber 102 are non-high-temperature environments, in one embodiment, they can be connected to form an electrically positive pressure explosion-proof chamber. Due to the heating effect of the heating module, the temperature inside the temperature control chamber 103 is relatively high, and its internal pressure cannot be synchronized with the pressures of other chambers (such as the electrically positive pressure explosion-proof chamber). Therefore, to ensure an accurate positive pressure environment within the temperature control chamber 103, it can be a separate temperature-controlled positive pressure explosion-proof chamber.

[0039] In some cases, the pressure inside the chamber may be too high, requiring depressurization. The following solution will combine... Figure 2 , Figure 4 and Figure 5 This section will explain the explosion-proof positive pressure systems for electrical positive pressure explosion-proof chambers and temperature-controlled positive pressure explosion-proof chambers. Figure 4 A front view showing the detailed internal structure of a positive pressure explosion-proof gas chromatograph 100 according to an embodiment of the present invention is shown. Figure 5 It shows Figure 4 Rear view of the gas chromatograph 100.

[0040] like Figure 2 , Figure 4 and Figure 5 As shown, the gas chromatograph 100 may further include a first explosion-proof positive pressure system for controlling the positive pressure environment of the electrically controlled positive pressure explosion-proof chamber and a second explosion-proof positive pressure system for controlling the positive pressure environment of the temperature-controlled positive pressure explosion-proof chamber. The first explosion-proof positive pressure system may include an exhaust assembly and an exhaust port 1016, the exhaust port 1016 being connected to the exhaust assembly. The exhaust assembly and exhaust port 1016 may be located on one side inside the electrical chamber 101, and the exhaust port 1016 is connected to the outside of the electrical chamber 101. The second explosion-proof positive pressure system may include an exhaust assembly and an exhaust port 1036, the exhaust port 1036 being connected to the exhaust assembly. The exhaust assembly and exhaust port 1036 may be located on the other side inside the electrical chamber 101, and the exhaust port 1036 is connected to the outside of the electrical chamber 101.

[0041] See also Figure 2The exhaust assembly of the first explosion-proof positive pressure system may include a pressure relief valve (e.g., a common mechanical pressure relief valve) and a first pressure sensor (not shown in the figure) for monitoring the gas pressure inside the electrically positive pressure explosion-proof chamber. The pressure relief valve is used to open when the gas pressure is too high (exceeding a safety threshold) to discharge the explosion-proof gas from the exhaust port. The pressure relief valve and the first pressure sensor may be integrated into a housing 1015, which has an inlet and an outlet. An exhaust port 1016 may be provided on the chamber wall of the electrical chamber 101. The inlet of the housing 1015 is located inside the electrical chamber 101 to allow the explosion-proof gas inside the electrically positive pressure explosion-proof chamber to enter the housing 1015. The outlet of the housing 1015 communicates with the exhaust port 1016 to discharge the explosion-proof gas.

[0042] See also Figure 2 and Figure 5 The exhaust assembly of the second explosion-proof positive pressure system may include at least a pressure relief valve (e.g., a common mechanical pressure relief valve) and a second pressure sensor (not shown in the figure) that monitors the gas pressure inside the temperature-controlled positive pressure explosion-proof chamber. The pressure relief valve is used to open when the gas pressure is too high (exceeding the safety threshold) to discharge the explosion-proof gas from the exhaust port, thereby maintaining the temperature-controlled positive pressure explosion-proof chamber in a stable positive pressure state. The pressure relief valve and the second pressure sensor may be integrated into a housing 1035, which has an inlet and an outlet. An exhaust port 1036 for pressure relief may be provided on the chamber wall of the electrical compartment 101. In addition to a common mechanical pressure relief valve, the pressure relief valves of the first and second explosion-proof positive pressure systems may also be solenoid valves. The solenoid valve can be controlled to open or close by the explosion-proof positive pressure system to vent or not vent the electrical positive pressure explosion-proof chamber or the temperature-controlled positive pressure explosion-proof chamber. Figure 2 As shown, the second explosion-proof positive pressure system may further include a temperature-controlled pressure relief pipe 1034 communicating with the temperature-controlled positive pressure explosion-proof chamber. The temperature-controlled pressure relief pipe 1034 is connected to both the temperature-controlled positive pressure explosion-proof chamber and the exhaust assembly; that is, one end of it is connected to the interior of the temperature-controlled chamber 103, and the other end is connected to the air inlet of the housing 1035 to transmit explosion-proof gas from the temperature-controlled chamber 103 into the housing 1035. The air outlet of the housing 1035 is connected to the exhaust port 1036 to discharge the explosion-proof gas. This structure allows the temperature-controlled pressure relief pipe 1034 to enter the electrical chamber 101 through the connection holes between the EPC chamber 102 and the temperature-controlled chamber 103, and between the EPC chamber 102 and the electrical chamber 101, thus eliminating the need for additional openings in the chamber walls of the electrical chamber 101, the temperature-controlled chamber 103, and the gas passage chamber 104.

[0043] The exhaust assemblies and vents of the two explosion-proof positive pressure systems are located within the electrical chamber 101, facilitating the connection between electrical components (e.g., pressure sensors) in the exhaust assemblies and other circuit modules (e.g., positive pressure control devices) within the electrical chamber 101. The exhaust assembly and vent 1016 of the first explosion-proof positive pressure system are located within the electrical chamber 101, eliminating the need for long pipes to transmit gas to its exhaust assembly, thus saving costs and reducing the chamber's footprint. The exhaust assembly of the second explosion-proof positive pressure system is located within the electrical chamber 101, not within the temperature control chamber 103, preventing the high temperatures within the temperature control chamber 103 from affecting the operation of electrical components and signal transmission in signal lines, and ensuring the lifespan of the electrical components.

[0044] To save space inside the electrical room 101, the exhaust assemblies of the first and second explosion-proof positive pressure systems can be arranged on the top walls on both sides of the electrical room 101 (e.g., Figure 2 As shown in the diagram, the vent 1016 of the first explosion-proof positive pressure system and the vent 1036 of the second explosion-proof positive pressure system can be arranged on the rear side wall of the electrical room 101 (as shown in the diagram). Figure 5 (As shown in the diagram). This design saves space in the middle of the electrical room 101 to accommodate other electrical modules.

[0045] As described in the preceding embodiments, the exhaust assembly of the first explosion-proof positive pressure system may include a first pressure sensor that monitors the air pressure inside the electrically positive pressure explosion-proof chamber. In this case, the first explosion-proof positive pressure system may further include a first positive pressure control device, which is electrically connected to the first pressure sensor and used to determine whether the air pressure inside the electrically positive pressure explosion-proof chamber has reached a safe threshold. This method is a conventional method.

[0046] Similar to the first explosion-proof positive pressure system, the exhaust assembly of the second positive pressure system may include a second pressure sensor that monitors the air pressure inside the temperature-controlled positive pressure explosion-proof chamber. In this case, the second explosion-proof positive pressure system may also include a second positive pressure control device, which is electrically connected to the second pressure sensor and used to determine whether the air pressure inside the temperature-controlled positive pressure explosion-proof chamber has reached a safe threshold; this method is conventional. Both the first and second positive pressure control devices may include a positive pressure controller.

[0047] The first and second positive pressure control devices can be placed on opposite sides of the electrical compartment, for example, on the side walls of the electrical compartment 101. Placing the second positive pressure control device inside the electrical compartment 101 instead of the temperature control compartment 103 prevents the high temperatures in the temperature control compartment 103 from affecting the performance and lifespan of electrical components and signal lines, thereby ensuring the normal operation of electrical components, the accuracy of signal transmission in signal lines, and their lifespan. Placing the first and second positive pressure control devices on opposite sides of the electrical compartment saves space in the middle of the compartment, and installing them on the side walls of the electrical compartment 101 further saves space inside the compartment.

[0048] In one embodiment, the first explosion-proof positive pressure system may further include an openable cover plate corresponding to its exhaust port 1016 located outside the electrical chamber 101. Similarly, the second explosion-proof positive pressure system may further include an openable cover plate corresponding to its exhaust port 1036 located outside the electrical chamber 101. When the first and second explosion-proof positive pressure systems are in normal operation under power-on conditions, explosion-proof gas is continuously blown into the electrical positive pressure explosion-proof chamber and the temperature-controlled positive pressure explosion-proof chamber, and then blown open the corresponding openable cover plate to flow out of the electrical positive pressure explosion-proof chamber and the temperature-controlled positive pressure explosion-proof chamber. This maintains the explosion-proof gas in a flowing state, ensuring that the chambers are always filled with explosion-proof gas.

[0049] The higher the instantaneous gas pressure inside the chamber, the greater the angle at which the openable cover is blown open, allowing the explosion-proof gas to escape quickly. If an abnormal gas pressure is detected in the electrically positive pressure explosion-proof chamber or the temperature-controlled positive pressure explosion-proof chamber, the power supply to the gas chromatograph itself can be cut off without cutting off the power to the explosion-proof gas inlet pump, ensuring that the explosion-proof gas still fills the electrically positive pressure explosion-proof chamber or the temperature-controlled positive pressure explosion-proof chamber. During equipment maintenance, all power is cut off (the power supply to the gas chromatograph itself, the first explosion-proof positive pressure system, and the second explosion-proof positive pressure system are all turned off), and the inlet pump is not working. At this time, the openable cover is in the closed state, thus preventing external air containing explosive gases or dust from entering the electrically positive pressure explosion-proof chamber or the temperature-controlled positive pressure explosion-proof chamber through the exhaust port.

[0050] The structure of the openable cover in both the first and second explosion-proof positive pressure systems, and its installation method on the electrical chamber 101, can be the same; for example, it can be hinged to the outer wall of the electrical chamber 101. In one implementation, the openable cover can be made of metal, such as steel plate. In one embodiment, an elastic element such as a spring can be provided between the openable cover and the outer wall of the chamber to ensure effective rebound of the openable cover and prevent air containing explosive gases or dust from entering the chamber through the exhaust port.

[0051] In one embodiment, a filter plate can be installed inside the vent, which can be used to extinguish sparks and hot particles, preventing sparks and hot particles that may exist in the electrically positive pressure explosion-proof chamber or the temperature-controlled positive pressure explosion-proof chamber from being discharged into the flammable hazardous environment.

[0052] In some abnormal situations, the gas pressure inside the electrically positive pressure explosion-proof chamber or the temperature-controlled positive pressure explosion-proof chamber may be too high (as mentioned above) or too low. For example, when the output of the explosion-proof gas inlet pump is abnormal, the pressure difference between the gas pressure inside the chamber and the external gas pressure may exceed the set safety threshold; when the chamber leaks, the pressure difference may fall below the set safety threshold. In this case, appropriate measures need to be taken to maintain the positive pressure environment inside the chamber. Specifically: when the pressure difference between the gas pressure inside the electrically positive pressure explosion-proof chamber or the temperature-controlled positive pressure explosion-proof chamber and the external gas pressure (which can be pre-collected) is detected to be higher or lower than the set safety threshold, the power supply to the gas chromatograph itself can be cut off, thereby de-energizing and stopping the operation of the various modules of the gas chromatograph used to realize its analytical function (such as the sample injection device, heating module, filter, and gas analysis module) and triggering an alarm, but the explosion-proof gas still enters normally and fills the chamber.

[0053] The first and second explosion-proof positive pressure systems are used to maintain the corresponding chambers in an explosion-proof positive pressure state. They include at least the positive pressure control device, exhaust assembly, and throttle valve installed on the inlet pipe of the explosion-proof gas, as described above. The positive pressure control device functions as follows: controlling the throttle valve to control the inlet flow rate of the explosion-proof gas; receiving signals from the corresponding pressure sensor to detect whether the gas pressure in the corresponding chamber is within a safe threshold (as described in the previous embodiment); and cutting off the power supply to the gas chromatograph and simultaneously triggering an alarm when the gas pressure is higher or lower than the safe threshold.

[0054] Taking the first explosion-proof positive pressure system as an example, it includes a first positive pressure control device, an exhaust assembly, and a first throttle valve on the air inlet pipe of the electrically positive pressure explosion-proof chamber. The first positive pressure control device controls the first throttle valve to control the airflow rate of the explosion-proof gas in the electrically positive pressure explosion-proof chamber; it receives the signal from the first pressure sensor to detect whether the gas pressure in the electrically positive pressure explosion-proof chamber is within a safe threshold (as described in the previous embodiment); when the gas pressure is higher or lower than the safe threshold, it cuts off the power supply to the gas chromatograph and simultaneously triggers an alarm. The second explosion-proof positive pressure system is similar and will not be described in detail here.

[0055] To connect the electrical compartment 101 and the EPC compartment 102, at least one connecting pipe can be used. The ends of the connecting pipe extending out of the electrical compartment 101 and the EPC compartment 102 can be threaded. A sealing ring (not shown in the figure) can be provided on the outside of the nut that mates with the thread to seal the connection points between the connecting pipe and the electrical compartment 101 and the EPC compartment 102. This structure prevents air leakage from the electrically positive pressure explosion-proof chamber. The outside of this connection point can be the side of the nut furthest from the other nut and closer to the end of the connecting pipe.

[0056] Figure 6 It shows Figure 4 Left view of the internal structure of the positive pressure explosion-proof gas chromatograph 100, showing the specific arrangement of the connecting pipes. The following section combines this solution with... Figure 4 and Figure 6 This section will explain the arrangement and structure of the connecting pipes.

[0057] like Figure 4 and 6 As shown, the connecting pipe 1061 between the electrical compartment 101 and the EPC compartment 102 can pass through the gas passage compartment 104, and the upper and lower nuts 1062 respectively tighten and fix the connecting pipe 1061. The temperature control pressure relief pipe 1034 of the second explosion-proof positive pressure system mentioned above can enter the electrical compartment 101 through this connecting pipe 1061.

[0058] To ensure the electrical positive pressure explosion-proof chamber quickly reaches pressure balance, multiple connecting pipes can be used, such as three or four. As an example, the connecting pipes can be metal or plastic pipes; metal pipes can be, for example, copper or stainless steel pipes. To further improve the sealing performance of the electrical chamber 101 and the EPC chamber 102, rubber gaskets (not shown in the figure) can be fitted between the nut at each end and the corresponding chamber wall.

[0059] As mentioned earlier, the temperature-controlled chamber 103 includes detectors (i.e., the detection modules mentioned earlier, such as FID detectors) for detecting the components separated from the gas sample to be tested. Figure 4 As shown, the gas passage chamber 104 can be arranged between the electrical chamber 101 and the temperature control chamber 103. At this time, the signal line of the detector 1037 can enter the electrical chamber 101 through the gas passage chamber 104 so as to connect with the control module 1017 in the electrical chamber 101.

[0060] Currently, the signal line of detector 1037 passes through the EPC chamber 102 on one side of the temperature control chamber 103 and enters the electrical chamber 101. The EPC chamber 102 contains many electromagnetic devices, such as the EPC electronic flow control module and solenoid valves. These electromagnetic devices can cause electromagnetic interference to the detection signal in the signal line, affecting signal quality and even causing signal transmission interruption and data loss. In contrast, the gas path chamber 104 mainly houses the gas path module, which has minimal electromagnetic interference to the signal. Therefore, allowing the detector's signal line to enter the electrical chamber from the gas path chamber 104 can reduce electromagnetic interference to the signal, ensure signal transmission quality, and thus guarantee the accuracy and timeliness of the data. In addition, since it does not bypass the EPC chamber 102, the length of the signal line can be greatly reduced, thereby reducing the possibility of signal interference, increasing signal transmission speed, and improving signal transmission quality to a certain extent.

[0061] To protect the signal lines of detector 1037, an insulated line protection tube 1044 (e.g., Figure 4 As shown in the diagram, the signal line of detector 1037 can pass through the line protection tube 1044, thus isolating the circuit and the air path so that the two do not interfere with each other. In different implementation scenarios, the line protection tube 1044 can be a plastic tube or a rubber tube.

[0062] To facilitate the handling of the gas chromatograph 100 by forklifts or other transport equipment, the gas chromatograph 100 may also include a gap, which can be located below the integral structure formed by welding the electrical chamber 101, EPC chamber 102, temperature control chamber 103, and gas path chamber 104. For example... Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, the gap 111 can be set below the enclosure of the EPC chamber 102 and the temperature control chamber 103. During transportation, the forklift forks can be inserted into the gap 111 to move and transport the gas chromatograph 100.

[0063] When transporting a gas chromatograph, it is usually necessary to hoist it. Therefore, mounting ears 110 can be provided on the integral structure formed by welding the electrical compartment 101, EPC compartment 102, temperature control compartment 103, and gas path compartment 104. The mounting ears 110 have holes to facilitate the hoisting and securing of the equipment. To ensure balanced force on the gas chromatograph during hoisting, multiple mounting ears 110 can be included, and these mounting ears 110 can be symmetrically arranged on the overall structure, for example... Figure 1 and 5 As shown, a mounting ear 110 is installed on each of the upper two sides of the electrical compartment 101 enclosure, one end of the EPC compartment 102 enclosure, and one end of the temperature control compartment 103 enclosure.

[0064] Since most of the electrical modules of the gas chromatograph 100 are located in the electrical chamber 101, the chamber is quite crowded. Therefore, it is necessary to rationally arrange the positions of the various electrical modules within the chamber to improve space utilization. For example... Figure 4 As shown, to save space in the middle of the electrical compartment 101 for other electrical modules, the positive pressure controllers and throttle valves of the two explosion-proof positive pressure systems (the first explosion-proof positive pressure system and the second explosion-proof positive pressure system) can be arranged on opposite sides of the electrical compartment 101. Specifically, the positive pressure controller and first throttle valve 1019 of the first explosion-proof positive pressure system are installed on one side wall of the electrical compartment 101, and the positive pressure controller 1039 and second throttle valve (not shown) of the second explosion-proof positive pressure system are installed on the other side wall of the electrical compartment 101. This saves space in the middle of the electrical compartment 101, where components such as terminal blocks 1025, signal conditioning modules 1026, and power modules 1027 can be installed. In addition to the positive pressure explosion-proof structures described above, the gas chromatograph 100 can also include other explosion-proof control structures, such as a cable-sealed explosion-proof connector 1020 (e.g., [missing information]) can be installed on the upper right side of the electrical compartment. Figure 5 As shown in the diagram, the cable sealing explosion-proof joint 1020 can seal, waterproof, tighten, and prevent explosions, ensuring the safe and stable operation of cable lines. Specifically, the cable sealing explosion-proof joint 1020 prevents flammable and explosive gases or dust from entering the colorimeter by sealing the connection between the cable and electrical equipment, thereby avoiding explosion accidents caused by electrical sparks and ensuring production safety.

[0065] To improve the explosion-proof performance of the EPC module itself in EPC chamber 102, in some embodiments, the EPC module can be placed inside a metal housing. The metal housing may include a cover and a shell, which are configured and connected according to explosion-proof requirements, for example, by designing a larger contact area between the cover and the shell. With this design, the EPC module itself can achieve an explosion-proof rating, allowing it to be placed in other non-explosion-proof chambers, such as a gas passage chamber, thereby saving space within the EPC chamber for other components.

[0066] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0067] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0068] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0069] While this specification has shown and described various embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover the modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A positive pressure explosion-proof gas chromatograph, characterized by, The gas path chamber and the electrical chamber, the EPC chamber and the temperature control chamber filled with explosion-proof gas to form a positive pressure explosion-proof chamber, the box bodies of the electrical chamber, the EPC chamber, the temperature control chamber and the gas path chamber are welded to form a whole, and sealing strips are arranged on the box doors of the electrical chamber, the EPC chamber and the temperature control chamber to seal the box bodies.

2. The gas chromatograph of claim 1, wherein, The electrical chamber and the EPC chamber communicate to form an electrical positive pressure explosion-proof chamber, and the temperature control chamber forms a temperature control positive pressure explosion-proof chamber, the gas chromatograph further comprises a first explosion-proof positive pressure system for controlling the positive pressure environment of the electrical positive pressure explosion-proof chamber and a second explosion-proof positive pressure system for controlling the positive pressure environment of the temperature control positive pressure explosion-proof chamber. The first explosion-proof positive pressure system comprises an exhaust assembly and an exhaust hole, the exhaust hole is communicated with the exhaust assembly, the exhaust assembly and the exhaust hole are located on one side of the electrical chamber, and the exhaust hole is communicated with the outside of the electrical chamber; the second explosion-proof positive pressure system comprises an exhaust assembly and an exhaust hole, the exhaust hole is communicated with the exhaust assembly, the exhaust assembly and the exhaust hole are located on the other side of the electrical chamber, and the exhaust hole is communicated with the outside of the electrical chamber.

3. The gas chromatograph of claim 2, wherein, The exhaust assembly of the first explosion-proof positive pressure system comprises a first pressure sensor for monitoring the gas pressure in the electrical positive pressure explosion-proof chamber; the first explosion-proof positive pressure system further comprises a first positive pressure control device which is electrically connected with the first pressure sensor and is used for judging whether the gas pressure in the electrical positive pressure explosion-proof chamber reaches a safety threshold value; The exhaust assembly of the second explosion-proof positive pressure system comprises a second pressure sensor for monitoring the gas pressure in the temperature control positive pressure explosion-proof chamber; the second explosion-proof positive pressure system further comprises a second positive pressure control device which is electrically connected with the second pressure sensor and is used for judging whether the gas pressure in the temperature control positive pressure explosion-proof chamber reaches a safety threshold value; The first positive pressure control device and the second positive pressure control device are arranged on the two sides of the electrical chamber.

4. The gas chromatograph of claim 2, wherein, The first explosion-proof positive pressure system further comprises an openable and closable cover plate arranged outside the electrical chamber and corresponding to the exhaust hole thereof; The second explosion-proof positive pressure system further comprises an openable and closable cover plate arranged outside the electrical chamber and corresponding to the exhaust hole thereof.

5. The gas chromatograph of claim 1, wherein, The electrical chamber and the EPC chamber are communicated through at least one communication pipe, threads are arranged on the end portions of the communication pipe extending out of the electrical chamber and the EPC chamber, and sealing rings are arranged outside the nuts matched with the threads to seal the connections of the communication pipe and the electrical chamber and the EPC chamber respectively.

6. The gas chromatograph of claim 1, wherein, The gas path chamber is arranged between the electrical chamber and the temperature control chamber, the temperature control chamber comprises a detector for detecting each component separated from the gas sample to be detected, and the signal line of the detector enters the electrical chamber through the gas path chamber to be connected with the control module in the electrical chamber.

7. The gas chromatograph of claim 1, wherein, The box body of the temperature control chamber comprises an inner box and an outer box, there is a cavity between the inner box and the outer box, and heat preservation cotton is filled in the cavity; the box door of the temperature control chamber comprises an inner cover and an outer cover, there is a cavity between the inner cover and the outer cover, and heat preservation cotton is filled in the cavity.

8. The gas chromatograph of claim 1, wherein, Further comprising a gap, which is arranged below the overall structure of the box bodies of the electrical chamber, EPC chamber, temperature control chamber and air path chamber welded together.

9. The gas chromatograph of any one of claims 1-8, wherein, Mounting ears are arranged on the overall structure of the box bodies of the electrical chamber, EPC chamber, temperature control chamber and air path chamber welded together.

10. The gas chromatograph of claim 9, wherein, A plurality of mounting ears are arranged symmetrically on the overall structure.

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