Body positive pressure explosion-proof gas chromatograph

Abstract

The utility model relates to a gas chromatograph with a positive-pressure explosion-proof body, which comprises an electrical chamber, an EPC chamber and a temperature control chamber which are filled with explosion-proof gas to form a positive-pressure explosion-proof cavity, box bodies of the electrical chamber, the EPC chamber and the temperature control chamber are mutually welded, and respective box doors and box bodies of the electrical chamber, the EPC chamber and the temperature control chamber are locked through screw cylindrical locks. Due to the fact that the box bodies of all the cavities of the hue chromatograph are connected in a welded mode, connection of the box bodies is more stable and not prone to loosening, holes do not need to be punched in the box bodies, and therefore the positive pressure environment in the cavities can be prevented from being affected by air leakage. In addition, the workload of welding connection is small, and the production efficiency is higher. According to the scheme, the box door and the box body of each cavity are locked through the screw cylindrical lock, the sealing performance of the box body and the box door can be improved, it is effectively guaranteed that the positive pressure environment is maintained in the cavity, and then the anti-explosion safety of the cavity can be improved.

Description

TECHNICAL FIELD

[0001] The utility model generally relates to the technical field of explosion -proof equipment. More specifically, the utility model relates to a body positive pressure explosion -proof gas chromatograph. BACKGROUND

[0002] In large modern petrochemical, steel, coal and other enterprises, due to the storage, transportation and material production, processing and handling process involving explosive substances, there are explosive hazardous substances. The analytical instruments used in these enterprises need to meet the explosion-proof requirements, generally in order to improve the explosion-proof grade, the on-site monitoring equipment is placed in the explosion-proof cabinet, although it can meet the on-site explosion-proof index requirements, but due to its low integration, complex on-site operation and debugging, there are limitations in use.

[0003] At present, gas chromatograph is used for qualitative and quantitative analysis of complex mixtures of multiple components, according to different functions, it includes multiple chambers, the connection relationship between the corresponding box of each chamber makes the product assembly difficult and the production efficiency is low. In addition, in order to meet the explosion-proof requirements, the explosion-proof gas is usually filled in the chamber with circuit board and electrical elements arranged inside, the connection relationship of each chamber cannot guarantee the sealing of the chamber box, which is easy to cause gas leakage, thereby affecting its explosion-proof ability.

[0004] Therefore, it is urgent to provide a body positive pressure explosion -proof gas chromatograph scheme, the connection between the box is stable, the assembly efficiency is higher, the sealing performance is strong, and the explosion -proof safety is higher. UTILITY MODEL CONTENT

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

[0006] In a first aspect, the utility model provides a body positive pressure explosion -proof gas chromatograph, which comprises an electrical chamber, an EPC chamber and a temperature control chamber filled with explosion -proof gas to form a positive pressure explosion -proof chamber, the box of the electrical chamber, the EPC chamber and the temperature control chamber are welded with each other, and the box door and the box of the electrical chamber, the EPC chamber and the temperature control chamber are locked by screw cylindrical lock.

[0007] In one embodiment, the electrical chamber and the EPC chamber are communicated to form an electrical positive pressure explosion -proof chamber, and 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 the first explosion -proof positive pressure system is arranged in the electrical chamber.

[0008] In one embodiment, the electrical chamber and the EPC chamber are communicated through at least one communication pipe, threaded ends of the communication pipe extending out of the electrical chamber and the EPC chamber are provided with nuts, and sealing rings are provided outside the nuts to seal the communication pipe and the connection between the electrical chamber and the EPC chamber, respectively.

[0009] In one embodiment, the temperature control chamber forms a temperature control positive pressure explosion-proof chamber, and the gas chromatograph further comprises a second explosion-proof positive pressure system for controlling the positive pressure environment of the temperature control positive pressure explosion-proof chamber; the second explosion-proof positive pressure system comprises a temperature control pressure relief pipeline, an exhaust assembly and a positive pressure control device, the temperature control pressure relief pipeline is communicated with the temperature control positive pressure explosion-proof chamber and the exhaust assembly, and the positive pressure control device and the exhaust assembly are arranged in the electrical chamber.

[0010] In one embodiment, the first explosion-proof positive pressure system comprises an exhaust assembly, and the exhaust assemblies of the first explosion-proof positive pressure system and the second explosion-proof positive pressure system are arranged on two sides of the electrical chamber.

[0011] In one embodiment, the first explosion-proof positive pressure system comprises an exhaust assembly, an exhaust hole arranged on a chamber wall of the electrical chamber and an openable and closable cover plate arranged outside the electrical chamber and corresponding to the exhaust hole.

[0012] In one embodiment, the gas chromatograph further comprises a gas path chamber in which a gas path module is arranged, and the gas path chamber is welded with the electrical chamber, the EPC chamber and the temperature control chamber to form an integral whole.

[0013] In one embodiment, the box door and the box body of the gas path chamber are locked by a screw cylinder lock.

[0014] In one embodiment, the gas path chamber is arranged between the electrical chamber and the temperature control chamber, the temperature control chamber comprises a detector for detecting components separated from a gas sample to be detected, and a signal line of the detector enters the electrical chamber through the gas path chamber to be connected with a control module in the electrical chamber.

[0015] In one embodiment, a sealing strip is arranged on the box door of the electrical chamber, the EPC chamber, the temperature control chamber and the gas path chamber to seal the box door with the box body.

[0016] In summary, compared with existing technologies, the technical solutions conceived in this invention offer several advantages. Firstly, the welded connections between the chambers of the gas chromatograph, compared to bolted connections, provide a more stable and less prone-to-loosening connection. Secondly, the elimination of drilling holes in the chambers prevents leaks from affecting the positive pressure environment within the chambers. Furthermore, welding reduces labor and increases production efficiency compared to bolted connections. Thirdly, the chamber doors and bodies of this solution are secured with screw-type cylindrical locks. Compared to tongue-type locks (rotary tongue locks), this locking structure improves the sealing of the chamber and doors, effectively maintaining a positive pressure environment within the chambers and preventing external explosive gases from entering, thereby enhancing the explosion-proof safety of the chambers. Attached Figure Description

[0017] The above and other objects, features, and advantages of the present invention will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. The present invention is illustrated in the drawings by way of example and not limitation.

[0018] Several embodiments of the utility model, wherein the same or corresponding reference numerals denote the same or corresponding parts, wherein:

[0019] Figure 1 An exemplary structural diagram of a gas chromatograph with a positive pressure explosion-proof body according to an embodiment of the present invention is shown;

[0020] Figure 2 It shows Figure 1 Front view of the internal structure of a positive pressure explosion-proof gas chromatograph;

[0021] Figure 3 A cross-sectional view of the installation of a screw-cylindrical lock according to an embodiment of the present invention is shown;

[0022] Figure 4 A front view of the internal structure of a gas chromatograph with positive pressure explosion protection according to another embodiment of the present invention is shown;

[0023] Figure 5 It shows Figure 4 Rear view of a gas chromatograph;

[0024] Figure 6 An exemplary structural diagram of a gas chromatograph with a positive pressure explosion-proof body according to another embodiment of the present invention is shown;

[0025] Figure 7 It shows Figure 6 Front view of the internal structure of a positive pressure explosion-proof gas chromatograph;

[0026] Figure 8 It shows Figure 6A left view of an internal structure of the gas chromatograph with a body positive pressure explosion-proof;

[0027] Figure 9 It is shown that Figure 6 A rear view of the gas chromatograph with a body positive pressure explosion-proof. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] The specific implementation manners of the present application will be described in detail below with reference to the drawings.

[0030] Figure 1 An exemplary structural diagram of the gas chromatograph 100 with a body positive pressure explosion-proof in an embodiment of the present application is shown, Figure 2 It is shown that Figure 1 A front view of an internal structure of the gas chromatograph 100 with a body positive pressure explosion-proof, Figure 2 Only part of the electrical modules inside the electrical chamber are shown.

[0031] As Figure 1 And Figure 2 As shown in the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103 filled with explosion-proof gas to form a positive pressure explosion-proof cavity, the box bodies of the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103 are welded to each other, and the box doors and the box bodies of the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103 are locked by a screw cylinder lock.

[0032] The positive pressure explosion-proof refers to that fresh air or inert gas with a certain pressure is introduced into the shell of the equipment (the gas chromatograph), so that the surrounding combustible gas cannot enter the inside of the shell, thereby preventing the ignition source from contacting the explosive gas, and achieving the purpose of preventing explosion. Therefore, the above-mentioned explosion-proof gas can be clean and safe compressed air or inert gas such as nitrogen and helium.

[0033] The electrical chamber 101 is usually arranged with circuit boards and various electrical modules, such as power modules, control modules, signal conditioning modules, data acquisition and analysis modules, etc. The EPC refers to an automatic control technology of pressure and flow realized by a computer through an electronic pressure sensor and an electronic flow controller. The EPC chamber 102 is arranged with EPC modules and solenoid valves for realizing the automatic control technology. The temperature control chamber 103 is arranged with sample inlet devices, color temperature columns, filters, heating modules, detection modules, etc. for component separation and composition detection of the gas sample to be analyzed.

[0034] As shown in Figure 1 and Figure 2 , the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103 form a two-layer structure, in which the EPC chamber 102 and the temperature control chamber 103 are arranged side by side in the lower layer, and their housings are welded together. The electrical chamber 101 is in the upper layer of them, and its housing is welded with the housings of the EPC chamber 102 and the temperature control chamber 103, respectively. The welding connection can make the connection of these housings more stable and not easy to loosen, and does not need to punch holes on the housings, so as to prevent gas leakage and affect the positive pressure environment in the chamber. In addition, the welding connection is less laborious than the bolt connection and has higher production efficiency.

[0035] In order to facilitate the operation of the elements inside the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103, in an embodiment, the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103 each include a housing and a door, and the housing and the door can be hingedly connected, and the door and the housing of each are locked by a screw cylinder lock. As shown in Figure 2 , the housing 1012 and the door 1011 of the electrical chamber 101 are hingedly connected and locked by the upper and lower screw cylinder locks 1013 of the door 1011; the housing 1022 and the door 1021 of the EPC chamber 102 are hingedly connected and locked by the upper and lower screw cylinder locks 1023 of the door 1021; the housing 1032 and the door 1031 of the temperature control chamber 103 are hingedly connected and locked by the upper and lower screw cylinder locks 1033 of the door 1031. The arrangement of the upper and lower screw cylinder locks on the door can ensure the tight connection of the door and the housing at each position, thereby improving the overall sealing performance of the housing. In other embodiments, only one screw cylinder lock can be arranged on the door of the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103, which can be arranged at one end (upper end or lower end) or in the middle of the door. The structure of the screw cylinder lock of the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103 and its connection relationship with the door can be the same, which will be described below in Figure 3 . Figure 3The installation sectional view of the screw cylinder lock 311 of an embodiment of the utility model is shown, and the screw cylinder lock 311 is in the dashed line frame.

[0036] As shown in the figure, Figure 3 The screw cylinder lock 311 includes a screw. In use, an inner thread is arranged on the box body, and a lock hole is arranged on the box door. When locking the box door and the box body, the screw is screwed into the inner thread of the box body through the lock hole to lock the box door and the box body. When unlocking, the screw is rotated reversely to realize unlocking. The screw has a certain length, and the more the number of turns of the screw into the inner thread, the tighter the locking of the box door and the box body, and the locking is tighter than that of a lock with only one 90-degree rotating lock tongue,

[0037] The sealing property of the box door and the box body can be improved, the positive pressure environment in the cavity can be effectively ensured, the external explosive gas can be prevented from entering the inside of the box body, and the explosion-proof safety is improved.

[0038] The above description is about a mechanical screw cylinder lock, and the principle of an electronic screw cylinder lock is similar, and the rotation of the screw is controlled through an electronic key or password input to realize the opening and closing operation of the box door.

[0039] In an embodiment, the box body 1032 of the temperature control chamber 103 can include an inner box and an outer box, and there is a cavity between the inner box and the outer box, and the cavity can be filled with thermal insulation cotton. The box door 1031 can include an inner cover and an outer cover, and there is a cavity between the inner cover and the outer cover, and the cavity can be filled with thermal insulation cotton. The design can make the temperature control chamber 103 have better thermal insulation effect.

[0040] Generally, the pressure in the cavities of the electrical chamber 101, the EPC chamber 102 and the temperature control chamber 103 should be slightly higher than the external environment pressure to form a micro-positive pressure environment, so that the external air that can contain explosive gas or dust (combustible gas) can be effectively prevented from entering the gas chromatograph. Since the electrical chamber 101 and the EPC chamber 102 are both non-high-heat environments, in an embodiment, the electrical chamber 101 and the EPC chamber 102 can be communicated to form an electrical positive pressure explosion-proof chamber.

[0041] In some cases, the pressure in the chamber can be too high, and at this time, the chamber needs to be depressurized. The explosion-proof positive pressure system of the electrical positive pressure explosion-proof chamber will be described below in combination with specific embodiments.

[0042] As shown in the figure, Figure 2As shown in the drawings, the gas chromatograph 100 can further comprise a first explosion-proof positive pressure system for controlling the positive pressure environment of the electrically positive pressure explosion-proof chamber, which can be arranged in the electric chamber 101, for example, in the box 1012 of the electric chamber. Arranging the first explosion-proof positive pressure system in the electric chamber 101 can facilitate the connection of the electrical elements therein with other circuit modules in the electric chamber 101, and can avoid the need to arrange a long pipeline to transmit gas to the exhaust assembly, thereby saving cost and reducing the occupied area of the chamber.

[0043] To realize the communication between the electric chamber 101 and the EPC chamber 102, at least one communication pipe can be arranged therebetween, and a thread can be arranged at the end of the communication pipe extending out of the electric chamber 101 and the EPC chamber 102, and a sealing ring (not shown in the drawings) can be arranged on the outer side of the nut matched with the thread to seal the connection of the communication pipe and the electric chamber 101 and the EPC chamber 102, respectively. This structure can prevent the electrically positive pressure explosion-proof chamber from leaking. The outer side here can be the side of the nut away from the other nut and close to the end of the communication pipe.

[0044] To ensure that the electrically positive pressure explosion-proof chamber quickly reaches pressure balance, a plurality of communication pipes can be used, for example, 3, 4, etc. As an example, the communication pipe can be a metal pipe or a plastic pipe, and the metal pipe can be, for example, a copper pipe or a stainless steel pipe, etc. To further improve the sealing of the electric chamber 101 and the EPC chamber 102, a rubber gasket (not shown in the drawings) can also be sleeved between the nut at each end and the corresponding chamber wall.

[0045] Due to the heating effect of the heating module, the temperature in the temperature control chamber 103 is relatively high, and the air pressure therein cannot be synchronized with that of other chambers (such as the electrically positive pressure explosion-proof chamber). Therefore, to ensure an accurate positive pressure environment in the temperature control chamber 103, the temperature control chamber 103 can form a temperature control positive pressure explosion-proof chamber alone. To maintain a stable positive pressure environment therein, when the temperature control

[0046] When the air pressure in the positive pressure explosion-proof chamber is too high, it needs to be relieved. Based on this, the gas chromatograph 100 can further comprise a second explosion-proof positive pressure system for controlling the positive pressure environment of the temperature control positive pressure explosion-proof chamber.

[0047] The following embodiments will be described in combination with Figure 4 and Figure 5 to describe the structure and arrangement of the first explosion-proof positive pressure system and the second explosion-proof positive pressure system. Figure 4 A front view of the internal structure of the body positive pressure explosion-proof gas chromatograph 100 according to another embodiment of the present application is shown in FIG. 4, Figure 5 A front view of the internal structure of the body positive pressure explosion-proof gas chromatograph 100 according to another embodiment of the present application is shown in FIG. 4, Figure 4 A rear view of the gas chromatograph 100 is shown in FIG. 5. To clearly show the arrangement of the first explosion-proof positive pressure system and the second explosion-proof positive pressure system in the electric chamber 101,Figure 4 Other electrical modules in the electrical chamber 101 are removed.

[0048] As shown in Figure 4 The second explosion-proof positive pressure system can include a temperature control pressure relief pipeline 1034, an exhaust assembly, and a positive pressure control device (hereinafter referred to as "second positive pressure control device"). The exhaust assembly can at least include a pressure relief valve (for example, a common mechanical pressure relief valve) and a pressure sensor (hereinafter referred to as "second pressure sensor") for monitoring the air pressure in the temperature control positive pressure explosion-proof chamber (the pressure relief valve and the second pressure sensor are not shown in the figure), and the pressure relief valve is used to open when the air pressure is too high (exceeding a safety threshold) to discharge the explosion-proof gas from the exhaust hole. The second positive pressure control device can be electrically connected with the second pressure sensor and used to determine whether the air pressure in the temperature control positive pressure explosion-proof chamber reaches the safety threshold, which is a conventional method. In one implementation, the second positive pressure control device can at least include a positive pressure controller.

[0049] The pressure relief valve and the second pressure sensor can be integrated in a shell 1035, which has an air inlet and an air outlet, and an exhaust hole 1036 for pressure relief can be provided on the chamber wall of the electrical chamber 101 (as shown in Figure 5 The temperature control pressure relief pipeline 1034 communicates with the temperature control positive pressure explosion-proof chamber and the exhaust assembly, that is, one end thereof communicates with the cavity of the temperature control chamber 103, and the other end thereof communicates with the air inlet of the shell 1035 to transmit the explosion-proof gas in the temperature control chamber 103 into the shell 1035. The air outlet of the shell 1035 communicates with the exhaust hole 1036 to discharge the explosion-proof gas.

[0050] If the electrical elements in the exhaust assembly and the second positive pressure control device and the corresponding signal lines, etc. are arranged in the temperature control chamber 103, the high temperature in the chamber can affect the signal transmission in the signal lines and the accuracy of the work of the electrical elements, and reduce the service life thereof, therefore, in the present embodiment, the second positive pressure control device and the exhaust assembly can be arranged in the electrical chamber 101, so that the above-mentioned situation can be prevented.

[0051] As shown in Figure 4 The temperature control pressure relief pipeline 1034 can enter the electrical chamber 101 through the connecting hole between the EPC chamber 102 and the temperature control chamber 103 and the communication pipeline between the EPC chamber 102 and the electrical chamber 101, so that no additional holes need to be opened on the chamber walls of the electrical chamber 101, the temperature control chamber 103, and the gas circuit chamber 104.

[0052] As shown in Figure 4As shown, the first explosion-proof positive pressure system may also include an exhaust assembly, similar in structure to or similar to the second explosion-proof positive pressure system described above. The exhaust assemblies of the first and second explosion-proof positive pressure systems can be located on opposite sides of the electrical room 101. To save space inside the electrical room 101, the two exhaust assemblies can be arranged on the top walls on both sides of the electrical room 101. The exhaust port 1016 of the first explosion-proof positive pressure system and the exhaust port 1016 of the second explosion-proof positive pressure system...

[0053] All vents 1036 can be arranged on the rear side wall of the electrical room 101 (e.g., Figure 5 As shown in the diagram, this saves space in the middle of the electrical room 101 to accommodate other electrical modules.

[0054] exist Figure 4 and Figure 5 In the illustrated embodiment, the exhaust assembly of the first explosion-proof positive pressure system may include at least a pressure relief valve (e.g., a conventional mechanical pressure relief valve) and a pressure sensor (hereinafter referred to as the "first pressure sensor," the pressure relief valve and the first pressure sensor are not shown in the figure) that monitors 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.

[0055] In this embodiment, 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 in the electrically positive pressure explosion-proof chamber reaches a safety threshold. This method is a conventional method. The first positive pressure control device may also include a positive pressure controller.

[0056] In addition to ordinary mechanical pressure relief valves, the pressure relief valves for the first and second explosion-proof positive pressure systems can also be solenoid valves. Solenoid valves can be controlled to open or close via the explosion-proof positive pressure system to vent or prevent venting from electrically positive pressure explosion-proof chambers or temperature-controlled positive pressure explosion-proof chambers.

[0057] In some abnormal situations, the pressure inside the chamber may be too high or too low. For example, if the explosion-proof gas inlet pump outputs abnormally, the pressure difference between the chamber and the external pressure may exceed the set safety threshold; if the chamber leaks, the pressure difference may fall below the set safety threshold. In such cases, appropriate measures are needed to maintain a positive pressure environment inside the chamber. Specifically: when the pressure difference between the electrically positive pressure explosion-proof chamber and the external 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 can be cut off. This will cause the various modules of the gas chromatograph used to perform its analytical functions (such as the injection device, heating module, filter, and gas analysis module) to stop working and trigger an alarm, but the explosion-proof gas will still enter normally and fill the chamber.

[0058] As described in the above embodiments, the first explosion-proof positive pressure system may include an exhaust assembly, an exhaust port 1016 disposed on the wall of the electrical chamber 101, and an openable cover plate (not shown in the figure) disposed outside the electrical chamber 101 corresponding to the exhaust port. In the normal operating state when powered on, the first explosion-proof positive pressure system continuously blows explosion-proof gas into the electrical positive pressure explosion-proof chamber and then blows open the corresponding openable cover plate to flow out of the electrical positive pressure explosion-proof chamber. This maintains the explosion-proof gas in a flowing state, ensuring the chamber is always filled with explosion-proof gas.

[0059] Similarly, a second explosion-proof positive pressure system can also be included outside the electrical room 101, corresponding to its exhaust port 1036.

[0060] The structure and principle of the openable cover can be the same as or similar to those of the first explosion-proof positive pressure system. For example, in the normal operation of the second explosion-proof positive pressure system, the explosion-proof gas is continuously blown into the temperature-controlled positive pressure explosion-proof chamber and then blown open the corresponding openable cover to flow out of the temperature-controlled positive pressure explosion-proof chamber. This can keep the explosion-proof gas in a flowing state, and the chamber is always filled with explosion-proof gas.

[0061] 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 to the equipment is turned 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 shut 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.

[0062] In one implementation, the openable and closable cover plate can be hingedly connected to the outer wall of the electrical chamber 101. In one implementation, the openable and closable cover plate can be made of metal, such as steel plate. In one embodiment, a spring or other elastic member can be provided between the openable and closable cover plate and the outer wall of the chamber, so as to ensure effective rebound of the openable and closable cover plate and prevent external air containing explosive gas or dust from entering the chamber through the exhaust hole.

[0063] In one embodiment, a filter plate can be provided in the exhaust hole, which can be used to extinguish sparks and spark particles and prevent sparks and hot particles possibly existing in the electrical positive pressure explosion-proof chamber or the temperature control positive pressure explosion-proof chamber from being discharged into the flammable hazardous environment.

[0064] The first explosion-proof positive pressure system and the second explosion-proof positive pressure system are used to maintain the corresponding chamber in an explosion-proof positive pressure state, which at least includes the positive pressure control device, the exhaust assembly, and the throttle valve provided on the gas inlet pipeline of the explosion-proof gas, etc. The positive pressure control device has the following functions: controlling the throttle valve to control the gas inlet flow of the explosion-proof gas; receiving the signal of the corresponding pressure sensor to detect whether the gas pressure of the corresponding chamber is within the safety threshold (as described in the foregoing embodiments); and cutting off the power supply of the gas chromatograph itself and alarming when the gas pressure is higher or lower than the safety threshold.

[0065] Taking the first explosion-proof positive pressure system as an example, it includes the first positive pressure control device, the exhaust assembly, and the first throttle valve provided on the gas inlet pipeline of the electrical positive pressure explosion-proof chamber, etc. The first positive pressure control device controls the first throttle valve to control the gas inlet flow of the explosion-proof gas in the electrical positive pressure explosion-proof chamber; receives the signal of the first pressure sensor to detect whether the gas pressure of the electrical positive pressure explosion-proof chamber is within the safety threshold (as described in the foregoing embodiments); and cuts off the power supply of the gas chromatograph itself and alarms when the gas pressure is higher or lower than the safety threshold. The second explosion-proof positive pressure system is the same, and will not be described in detail.

[0066] Figure 6 An exemplary overall view of the body positive pressure explosion-proof gas chromatograph 100 according to another embodiment of the present application is shown in FIG. 4.

[0067] The gas chromatograph 100 can further include a gas path chamber 104 in which a gas path module is arranged, as shown in FIG. 5.

[0068] As shown in FIG. 5, the gas chromatograph 100 can further include a gas path chamber 104 in which a gas path module is arranged, as shown in FIG. 5. Figure 6 The gas path chamber 104 can be integrally formed with the electrical chamber 101, the EPC chamber 102, and the temperature control chamber 103 by welding. The gas path chamber 104 can include a gas path module, which can provide various required gases (such as the gas sample to be analyzed, auxiliary gas, and explosion-proof gas) for the gas chromatograph.

[0069] Similar to the welding of the electrical compartment 101, EPC compartment 102, and temperature control compartment 103, welding the gas passage compartment 104, electrical compartment 101, EPC compartment 102, and temperature control compartment 103 into a single unit makes the connection between these compartments more stable and less prone to loosening. This type of connection also requires less work and has higher production efficiency. Furthermore, since the gas passage compartment 104 is filled with explosion-proof gas to create a positive pressure explosion-proof environment, the welded connection also prevents air leakage from the compartment, thus helping to maintain the positive pressure environment.

[0070] The following plan will combine Figure 7 , Figure 8 and Figure 9 The gas chromatograph 100, which includes a gas passage chamber 104, will be described. Figure 7 It shows Figure 6 Front view of the internal structure of the positive pressure explosion-proof gas chromatograph 100. Figure 8 It shows Figure 6 Left view of the internal structure of the positive pressure explosion-proof gas chromatograph 100. Figure 9 It shows Figure 6 Rear view of the internal structure of the positive pressure explosion-proof gas chromatograph 100.

[0071] like Figure 7 As shown, similar to the electrical chamber 101, EPC chamber 102, and temperature control chamber 103 described above, the gas passage chamber 104 may also include a hinged enclosure 1042 and a door 1041. The door 1041 and enclosure 1042 of the gas passage chamber 104 can also be locked together by a screw-cylindrical lock 1043 arranged in the middle of the door 1041. The structure and working principle of the screw-cylindrical lock are the same as those of the electrical chamber 101, EPC chamber 102, and temperature control chamber 103, and will not be described in detail here. As mentioned above, the screw-cylindrical lock can improve the sealing of the gas passage chamber 104, thereby preventing gas leakage in the chamber and effectively maintaining a positive pressure environment in the chamber, thus improving its explosion-proof safety. In one embodiment, the enclosures of the electrical chamber 101, EPC chamber 102, temperature control chamber 103, and gas passage chamber 104 can be metal enclosures.

[0072] 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 1043 can also be positioned at other locations on the door 1041, such as the upper or lower end; this embodiment does not impose any limitations on this.

[0073] In order to facilitate the adjustment 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 box door 1041 of the gas path chamber 104. The pressure regulating valve is used to adjust the inlet (explosion-proof gas) pressure of the electrical positive pressure explosion-proof chamber and the temperature control positive pressure explosion-proof chamber, and display the real-time inlet pressure data of the two chambers through the pressure gauge. Installing the pressure gauge and the pressure regulating valve on the box door 1041 can save the space inside the box body 1042, thereby facilitating the arrangement of the gas path.

[0074] As shown in Figure 8 , the communication pipe 1061 between the electrical chamber 101 and the EPC chamber 102 described in the foregoing can

[0075] pass through the gas path chamber 104, and the upper and lower nuts 1062 are respectively screwed and fixed.

[0076] As described in the foregoing, the temperature control chamber 103 includes a detector (i.e., the detection module described in the foregoing, such as an FID detector) for detecting each component separated from the gas sample to be detected. As shown in Figure 7 、 Figure 8 and Figure 9 , the gas path chamber 104 can be arranged between the electrical chamber 101 and the temperature control chamber 103, and the signal line of the detector 1037 can pass through the gas path chamber 104 to enter the electrical chamber 101, so as to be connected with the control module 1017 in the electrical chamber 101.

[0077] At present, the signal line of the detector 1037 passes through the EPC chamber 102 on one side of the temperature control chamber 103 to enter the electrical chamber 101. The EPC chamber 102 includes many electromagnetic devices, such as an EPC electronic flow control module and a solenoid valve. These electromagnetic devices will cause electromagnetic interference to the detection signal in the signal line, affect the signal quality, and even cause signal transmission interruption and data loss. The gas path chamber 104 mainly arranges the gas path module, which has little effect on the electromagnetic interference of the signal. Therefore, the signal line of the detector entering the electrical chamber from the gas path chamber 104 can reduce the electromagnetic interference to the signal, ensure the transmission quality of the signal, and thus ensure the accuracy and timeliness of the data. In addition, since it does not pass through the EPC chamber 102, the length of the signal line can be greatly reduced, thereby reducing the possibility of signal being affected, improving the signal transmission speed, and improving the signal transmission quality.

[0078] In order to protect the signal line of the detector 1037, an insulated line protection pipe 1044 (as shown in Figure 7 ) can be arranged in the gas path chamber 104 (the box body 1042). The signal line of the detector 1037 can pass through the line protection pipe 1044, so as to isolate the circuit and the gas path, thereby avoiding the influence of the two. In different implementation scenarios, the line protection pipe 1044 can be a plastic pipe or a rubber pipe.

[0079] In order to further ensure the sealing of the electrical chamber 101, the EPC chamber 102, the temperature control chamber 103 and the gas path chamber 104, prevent the external combustible gas from entering the electrical chamber 101, the EPC chamber 102, the temperature control chamber 103 and the gas path chamber 104, a sealing strip (for example, a rubber sealing strip) can also be provided on the box door of the electrical chamber 101, the EPC chamber 102, the temperature control chamber 103 and the gas path chamber 104, so as to be sealed with the respective box body. Referring to Figure 7 , a sealing strip 1018 is provided on the box door 1011 of the electrical chamber 101, so as to realize sealing with the box body 1012; a sealing strip 1024 is provided on the box door 1021 of the EPC chamber 102, so as to realize sealing with the box body 1022; a sealing strip 1038 is provided on the box door 1031 of the temperature control chamber 103, so as to realize sealing with the box body 1032; and a sealing strip 1045 is provided on the box door 1041 of the gas path chamber 104, so as to realize sealing with the box body 1042.

[0080] When transporting the gas chromatograph, it is usually necessary to hoist it, so that a mounting ear 110 can be provided on the overall structure formed by the box bodies of the electrical chamber 101, the EPC chamber 102, the temperature control chamber 103 and the gas path chamber 104, and a hole is provided on the mounting ear 110, so as to be hoisted and fixed by the hoisting equipment. In order to ensure that the gas chromatograph is balanced when hoisted, a plurality of mounting ears 110 can be included, which can be arranged symmetrically on the overall structure formed by the electrical chamber 101, the EPC chamber 101, the temperature control chamber 103 and the gas path chamber 104. For example, as shown in Figure 6 and Figure 9 , one mounting ear 110 is respectively arranged at the upper end of the box body of the electrical chamber 101, one end of the box body of the EPC chamber 102 and one end of the box body of the temperature control chamber 103.

[0081]

[0082] In order to facilitate the forklift and other transport equipment to transport the gas chromatograph 100, the gas chromatograph 100 can also include a gap, which can be arranged below the overall structure formed by the box bodies of the electrical chamber 101, the EPC chamber 102, the temperature control chamber 103 and the gas path chamber 104. As shown in Figure 6 , Figure 7 , Figure 8 and Figure 9 , the gap 111 can be arranged below the EPC chamber 102 and the temperature control chamber 103, and when transported, the prongs of the forklift can be inserted into the gap 111 to move and transport the gas chromatograph 100.

[0083] ​Since most of the electrical modules of the gas chromatograph 100 are arranged in the electrical chamber 101, the chamber is relatively crowded, and therefore the positions of the electrical modules in the chamber need to be arranged reasonably to improve the space utilization. In Figures 6-9 In the embodiment shown, in order to save the space in the middle of the electrical chamber 101 for arranging other electrical modules, the positive pressure controllers and the throttles of the two sets of explosion-proof positive pressure systems (the first and second explosion-proof positive pressure systems) can be arranged on both sides of the electrical chamber 101, i.e., the positive pressure controller and the throttle 1019 of the first explosion-proof positive pressure system are installed on the side wall on one side of the electrical chamber 101, and the positive pressure controller 1039 and the throttle (not shown in the figure) of the second explosion-proof positive pressure system are installed on the side wall on the other side of the electrical chamber 101, so that the space in the middle of the electrical chamber 101 is saved, and components such as the terminal strip 1025, the signal conditioning module 1026, and the power supply module 1027 can be installed there.

[0084] In addition to the above-described positive pressure explosion-proof structure, the gas chromatograph 100 can also include other explosion-proof control structures, for example, a cable sealing explosion-proof joint 1020 (as shown in Figure 9 the right upper part of the electrical chamber can be installed. The cable sealing explosion-proof joint 1020 can seal, waterproof, fasten, and prevent explosion, ensuring the safe and stable operation of the cable line. Specifically, the cable sealing explosion-proof joint 1020 seals the connection part of the cable and the electrical equipment, prevents flammable and explosive gases or dust from entering the interior of the gas chromatograph, thereby avoiding explosion accidents caused by electric sparks and the like, and ensuring production safety.

[0085] In order to improve the explosion-proof property of the EPC module itself in the EPC chamber 102, in some embodiments, the EPC module can be placed in a metal shell. The metal shell can include a cover and a shell, and the cover and the shell are arranged and connected according to the explosion-proof requirement, for example, the contact area of the cover and the shell is designed to be large. Through this design, the EPC module itself can reach the explosion-proof level, and thus it can be placed in other non-explosion-proof chambers, such as the gas path chamber, thereby saving the space in the EPC chamber for arranging other components.

[0086] In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "mounted", "connected", or "linked" and the like should be understood in a broad sense. For example, with respect to the term "connected", it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium.

[0087] Connected, can also be connected indirectly through an intermediate medium, or can be the internal connection of two elements or the interaction relationship of two elements. Therefore, unless otherwise explicitly defined in this specification, the above-mentioned terms can be understood by the person skilled in the art according to the specific circumstances.

[0088] According to the above description of the present specification, the person skilled in the art can also understand the terms used as follows, for example, the terms indicating the orientation or positional relationship 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 based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the scheme of the present application and simplifying the description, and are not explicitly or implicitly indicated that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present application.

[0089] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for the purpose of description, and cannot be understood as indicating relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "plurality" is at least two, for example, two, three or more, etc., unless otherwise explicitly and specifically limited.

[0090] Although the present application has shown and described the preferred embodiments of the present application, it will be apparent to those skilled in the art that many modifications, changes and substitutions can be made without departing from the spirit and scope of the present application. It should be understood that various alternative schemes to the embodiments of the present application described herein can be used in the practice of the present application. The appended claims are intended to define the scope of protection of the present application, and therefore cover the module composition, equivalents or alternatives within the scope of these claims.

Claims

1. A gas chromatograph with positive pressure explosion protection, characterized in that, It includes an electrical compartment, an EPC compartment, and a temperature control compartment, which are filled with explosion-proof gas to form a positive pressure explosion-proof chamber. The enclosures of the electrical compartment, EPC compartment, and temperature control compartment are welded together, and the doors and enclosures of the electrical compartment, EPC compartment, and temperature control compartment are locked together by screw cylinder locks.

2. The gas chromatograph according to claim 1, characterized in that, The electrical chamber and the EPC chamber are connected to form an electrical positive pressure explosion-proof chamber. The gas chromatograph also includes a first explosion-proof positive pressure system for controlling the positive pressure environment of the electrical positive pressure explosion-proof chamber. The first explosion-proof positive pressure system is installed in the electrical chamber.

3. The gas chromatograph according to claim 2, characterized in that, The electrical compartment and the EPC compartment are connected by at least one connecting pipe. The end of the connecting pipe extending out of the electrical compartment and the EPC compartment is threaded, and a sealing ring is provided on the outside of the nut that mates with the thread to seal the connection between the connecting pipe and the electrical compartment and the EPC compartment.

4. The gas chromatograph according to claim 2 or 3, characterized in that, The temperature control chamber forms a separate temperature-controlled positive pressure explosion-proof chamber, and the gas chromatograph also includes a second explosion-proof positive pressure system for controlling the positive pressure environment of the temperature-controlled positive pressure explosion-proof chamber; The second explosion-proof positive pressure system includes a temperature-controlled pressure relief pipe, an exhaust assembly, and a positive pressure control device. The temperature-controlled pressure relief pipe is connected to the temperature-controlled positive pressure explosion-proof chamber and the exhaust assembly. The positive pressure control device and the exhaust assembly are located in the electrical room.

5. The gas chromatograph according to claim 4, characterized in that, The first explosion-proof positive pressure system includes an exhaust assembly, and the exhaust assemblies of the first explosion-proof positive pressure system and the second explosion-proof positive pressure system are respectively located on both sides of the electrical room.

6. The gas chromatograph according to claim 4, characterized in that, The first explosion-proof positive pressure system includes an exhaust assembly, an exhaust port disposed on the wall of the electrical chamber, and an openable cover plate disposed on the outside of the electrical chamber corresponding to the exhaust port.

7. The gas chromatograph according to claim 1, characterized in that, The gas chromatograph also includes a gas path chamber with an internal gas path module, which is welded together with the electrical chamber, EPC chamber and temperature control chamber to form a whole.

8. The gas chromatograph according to claim 7, characterized in that, The door and body of the gas passage chamber are locked by a screw cylindrical lock.

9. The gas chromatograph according to claim 7, characterized in that, The gas path chamber is arranged between the electrical chamber and the temperature control chamber. The temperature control chamber includes detectors for detecting the components separated from the gas sample to be tested. The signal lines of the detectors enter the electrical chamber through the gas path chamber so as to connect with the control module in the electrical chamber.

10. The gas chromatograph according to any one of claims 7-9, characterized in that, Sealing strips are provided on the doors of the electrical compartment, EPC compartment, temperature control compartment and gas circuit compartment to seal them with their respective enclosures.

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