Gas analyzer

Abstract

The utility model discloses a gas analysis device, which relates to the technical field of engine tail gas detection, and is characterized in that a gas inlet of a gas analyzer is respectively communicated with gas outlets of a first gas cylinder and a second gas cylinder, a first electromagnetic valve is arranged between a first communication interface and the first gas cylinder, and a second electromagnetic valve is arranged between a second communication interface and the second gas cylinder; the second electromagnetic valve is arranged between the first communication interface and the second gas cylinder; the control module is in communication connection with the first electromagnetic valve and the second electromagnetic valve and is used for switching the opening and closing states of the first electromagnetic valve and the second electromagnetic valve when detecting that the gas pressure at the gas outlet of the first gas cylinder is less than or equal to a preset critical value, so as to conduct a gas path between the gas analyzer and the second gas cylinder; and when it is detected that the gas pressure at the gas outlet of the second gas cylinder is smaller than or equal to a preset critical value, switching the opening and closing states of the first electromagnetic valve and the second electromagnetic valve so as to conduct a gas path between the gas analyzer and the first gas cylinder. According to the utility model, the analysis efficiency of engine tail gas can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine tail gas detection, in particular to a gas analysis device. Background Art

[0002] When conducting automobile exhaust emission testing, the working gas pipeline needs to continuously supply gas to the bench analyzer, which consumes a lot of gas. In addition, once the working gas is under-pressured or cut off, the analyzer will not work, resulting in distortion of analysis data and failure of the exhaust gas analysis test. Therefore, it is usually adopted at present to supply gas to the analyzer by connecting multiple gas cylinders in parallel in the gas circuit, and display the gas supply progress of the current gas cylinder on the main control interface of the analyzer. When the tester monitors that the working gas in the current gas supply cylinder is about to be exhausted, the other gas cylinders in parallel in the gas circuit are manually switched to the gas supply cylinders to ensure uninterrupted gas supply. However, this method relies too much on manual monitoring. Once the gas supply cylinder is not replaced in time, the gas analyzer will stop working, thereby affecting the efficiency of exhaust analysis of the vehicle engine.

[0003] In summary, how to improve the analysis efficiency of engine exhaust is a technical problem that needs to be urgently solved in the field of engine exhaust detection technology. Utility Model Content

[0004] The main purpose of the utility model is to provide a gas analysis device, aiming to improve the analysis efficiency of engine exhaust.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a gas analysis device, which includes: a gas analyzer, a first gas cylinder, a second gas cylinder, a first solenoid valve, a second solenoid valve and a control module;

[0006] The gas inlet of the gas analyzer is connected to the gas outlets of the first gas cylinder and the second gas cylinder respectively, the first solenoid valve is arranged between the first communication interface and the first gas cylinder, and the second solenoid valve is arranged between the first communication interface and the second gas cylinder, wherein the first communication interface is a communication interface of the gas analyzer, the first gas cylinder and the second gas cylinder;

[0007] The control module is communicatively connected to the first solenoid valve and the second solenoid valve, respectively, and is used for switching the opening and closing states of the first solenoid valve and the second solenoid valve when it is detected that the gas pressure at the gas outlet of the first gas cylinder is less than or equal to a preset critical value, so as to open the gas path between the gas analyzer and the second gas cylinder, and for switching the opening and closing states of the first solenoid valve and the second solenoid valve when it is detected that the gas pressure at the gas outlet of the second gas cylinder is less than or equal to the preset critical value, so as to open the gas path between the gas analyzer and the first gas cylinder.

[0008] In one embodiment, the control module includes a first pressure gauge and a second pressure gauge:

[0009] The air inlet of the first pressure gauge is communicated with the air outlet of the first gas cylinder, and the air outlet of the first pressure gauge is communicated with the air inlet of the gas analyzer, and the first pressure gauge is used to trigger a first alarm signal when monitoring that the air pressure at the air outlet of the first gas cylinder is less than or equal to the preset critical value;

[0010] The gas inlet of the second pressure gauge is communicated with the gas outlet of the second gas cylinder, and the gas outlet of the second pressure gauge is communicated with the gas inlet of the gas analyzer, and the second pressure gauge is used to trigger a second alarm signal when the gas pressure at the gas outlet of the second gas cylinder is monitored to be less than or equal to the preset critical value;

[0011] The first solenoid valve is arranged on the gas path between the first pressure gauge and the first communication interface, and the second solenoid valve is arranged on the gas path between the second pressure gauge and the first communication interface.

[0012] In one embodiment, both the first pressure gauge and the second pressure gauge are electric contact pressure gauges.

[0013] In one embodiment, the control module further comprises a micro control unit;

[0014] The micro control unit is respectively connected to the first pressure gauge and the second pressure gauge for communication;

[0015] The micro control unit is used to switch the opening and closing states of the first solenoid valve and the second solenoid valve based on the first alarm signal or the second alarm signal.

[0016] In one embodiment, the gas analysis device further comprises: a first pressure relief gas path, a second pressure relief gas path, a first pressure relief valve, and a second pressure relief valve;

[0017] One end of the first pressure relief gas path is connected to the gas outlet of the first gas cylinder, the other end of the first pressure relief gas path is connected to the outside atmosphere, and the first pressure relief valve is arranged on the first pressure relief gas path;

[0018] One end of the second pressure relief gas path is connected to the gas outlet of the second gas cylinder, the other end of the second pressure relief gas path is connected to the outside atmosphere, and the second pressure relief valve is arranged on the second pressure relief gas path;

[0019] The first solenoid valve is arranged on the connecting gas path between the first connecting interface and the second connecting interface, and the second solenoid valve is arranged on the connecting gas path between the first connecting interface and the third connecting interface, wherein the second connecting interface is the connecting interface between the first pressure relief gas path and the first gas cylinder, and the third connecting interface is the connecting interface between the second pressure relief gas path and the second gas cylinder.

[0020] In one embodiment, the micro control unit is communicatively connected to the first pressure relief valve and the second pressure relief valve respectively, and the micro control unit is also used to switch the opening and closing state of the first pressure relief valve based on the first alarm signal, and to switch the opening and closing state of the second pressure relief valve based on the second alarm signal.

[0021] In one embodiment, the gas analysis device further includes a pressure regulating valve, and the pressure regulating valve is disposed on the gas path between the first communication interface and the gas analyzer.

[0022] In one embodiment, the gas analysis device includes at least two gas analyzers;

[0023] The gas inlet of each of the gas analyzers is respectively connected to the gas outlet of the first gas cylinder, and the fourth communication interface is connected to the gas outlet of the second gas cylinder, wherein the fourth communication interface is a communication interface between each of the gas analyzers and the first gas cylinder;

[0024] The first solenoid valve is disposed between the fourth communication interface and the first gas cylinder, and the second solenoid valve is disposed between the fourth communication interface and the second gas cylinder.

[0025] In one embodiment, the gas analysis device further includes at least one pressure regulating valve, and the fourth communication interface is connected to the gas inlet of at least one of the gas analyzers through the at least one pressure regulating valve.

[0026] In one embodiment, the gas analysis device further comprises an alarm module;

[0027] The alarm module comprises a remote alarm unit and an audible and visual alarm unit, and the alarm module is respectively connected to the first pressure gauge and the second pressure gauge for communication;

[0028] The alarm module is used to control the remote alarm unit and the sound and light alarm unit to alarm based on the first alarm signal or the second alarm signal.

[0029] The utility model provides a gas analysis device, which includes at least one gas analyzer, a first gas cylinder, a second gas cylinder, a first solenoid valve, a second solenoid valve and a control module, wherein the gas inlet of the gas analyzer is connected with the gas outlets of the first gas cylinder and the second gas cylinder respectively, the connecting interface between the gas analyzer, the first gas cylinder and the second gas cylinder is called the first connecting interface, the first solenoid valve is arranged between the first connecting interface and the first gas cylinder, and the second solenoid valve is arranged between the first connecting interface and the second gas cylinder, in addition, the control module is used to switch the opening and closing states of the first solenoid valve and the second solenoid valve when it is detected that the gas pressure at the gas outlet of the first gas cylinder is less than or equal to a preset critical value, so as to conduct the gas path between the gas analyzer and the second gas cylinder, and when it is detected that the gas pressure at the gas outlet of the second gas cylinder is less than or equal to the preset critical value, switch the opening and closing states of the first solenoid valve and the second solenoid valve to conduct the gas path between the gas analyzer and the first gas cylinder.

[0030] In this way, compared with the traditional gas analysis method that requires manual switching of the gas supply line, the present application sets a first solenoid valve on the gas line between the first gas cylinder and the gas analyzer, and sets a second solenoid valve on the gas line between the second gas cylinder and the gas analyzer, and switches the opening and closing states of the first solenoid valve and the second solenoid valve when the control module detects that the air pressure at the gas outlet of the first gas cylinder or the gas outlet of the second gas cylinder is less than or equal to a preset critical value, so that when the air pressure at the gas outlet of one gas cylinder is less than or equal to the preset critical value, the other gas cylinder is automatically switched to supply gas to the gas analyzer, thereby realizing automatic switching of the two gas supply lines, avoiding the problem of analyzer shutdown due to manual failure to switch the gas supply line in time, and thereby improving the efficiency of engine exhaust gas analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 A schematic structural diagram of a first embodiment of a gas analysis device provided by the utility model;

[0033] Figure 2 A first structural schematic diagram of a second embodiment of a gas analysis device provided by the utility model;

[0034] Figure 3 A second structural schematic diagram of the second embodiment of the gas analysis device provided by the utility model;

[0035] Figure 4 A schematic structural diagram of a third embodiment of a gas analysis device provided by the utility model;

[0036] Figure 5 This is a schematic structural diagram of a fourth embodiment of a gas analysis device provided by the utility model.

[0037] Description of Figure Numbers:

[0038] 10. Gas analyzer; 101. Air inlet of gas analyzer; 20. First gas cylinder; 201. Air outlet of first gas cylinder; 30. Second gas cylinder; 301. Air outlet of second gas cylinder; 40. First solenoid valve; 50. Second solenoid valve; 60. Control module; 601. First pressure gauge; 6011. Air inlet of first pressure gauge; 6012. Air outlet of first pressure gauge; 602. Second pressure gauge; 6021. Air inlet of second pressure gauge; 6022. Air outlet of second pressure gauge; 603. Micro control unit; A1. First pressure relief gas circuit; A2. Second pressure relief gas circuit; A3. First pressure relief valve; A4. Second pressure relief valve; B1. Pressure regulating valve; C1. Alarm module; C11. Remote alarm unit; C12. Sound and light alarm unit.

[0039] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

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

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "Solution 1 and / or Solution 2" as an example, it includes solutions that are satisfied by Solution 1, or Solution 2, or Solution 1 and Solution 2 at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0043] The utility model provides a gas analysis device.

[0044] See also Figure 1 In the first embodiment of the utility model, the gas analysis device includes: a gas analyzer 10, a first gas cylinder 20, a second gas cylinder 30, a first solenoid valve 40, a second solenoid valve 50 and a control module 60;

[0045] The gas inlet 101 of the gas analyzer 10 is connected to the gas outlets of the first gas cylinder 20 and the second gas cylinder 30 respectively, the first solenoid valve 40 is arranged between the first communication interface and the first gas cylinder 20, and the second solenoid valve 50 is arranged between the first communication interface and the second gas cylinder 30, wherein the first communication interface is a communication interface of the gas analyzer 10, the first gas cylinder 20 and the second gas cylinder 30;

[0046] The control module 60 is communicatively connected to the first solenoid valve 40 and the second solenoid valve 50 respectively, and is used to switch the opening and closing states of the first solenoid valve 40 and the second solenoid valve 50 when it is detected that the gas pressure at the gas outlet 201 of the first gas cylinder 20 is less than or equal to a preset critical value, so as to open the gas path between the gas analyzer 10 and the second gas cylinder 30, and to switch the opening and closing states of the first solenoid valve 40 and the second solenoid valve 50 when it is detected that the gas pressure at the gas outlet 301 of the second gas cylinder 30 is less than or equal to the preset critical value, so as to open the gas path between the gas analyzer 10 and the first gas cylinder 20.

[0047] It should be noted that, when different types of gas analyzers 10 are used to analyze and process vehicle engine exhaust, different types of gas analyzers 10 need to use working gases with different pressures during operation and periodic calibration, that is, different types of gas analyzers 10 have different requirements for the lower limit of the gas pressure of the input gas. Therefore, in order to avoid the gas analyzer 10 from stopping working due to underpressure or gas interruption of the input gas, it is necessary to ensure that the gas pressure of the gas input to the gas analyzer 10 is greater than the lower limit of the gas pressure required by the currently working gas analyzer 10. For example, when a single gas analyzer 10 is used for gas analysis, if the gas analyzer 10 requires the input gas pressure to be higher than the pressure a, that is, the lower limit of the pressure is a, then the critical value is set to a, that is, the above-mentioned preset critical value; when multiple gas analyzers 10 are used for gas analysis, the gas pressure requirements of each of the multiple gas analyzers 10 are determined, and the maximum gas pressure value among the lower limits of the pressure required by each of the multiple gas analyzers 10 is determined as the preset critical value. That is, the preset critical value is the lowest pressure value that can meet the pressure requirement of the input gas of the currently working gas analyzer 10. In this way, it is ensured that the pressure of the gas output by the first gas cylinder 20 or the second gas cylinder 30 is greater than the preset critical value to meet the pressure requirement of the input gas of the gas analyzer 10.

[0048] In this embodiment, the gas analysis device includes at least one gas analyzer 10 and at least two gas cylinders for supplying gas to the gas analyzer 10, namely, a first gas cylinder 20 and a second gas cylinder 30, and the gas analysis device also includes two solenoid valves, namely, a first solenoid valve 40 and a second solenoid valve 50. The gas inlet 101 of the gas analyzer 10 is connected to the gas outlet 201 of the first gas cylinder 20 and the gas outlet 301 of the second gas cylinder 30, respectively, and the connecting interface between the gas analyzer 10, the first gas cylinder 20 and the second gas cylinder 30 is referred to as the first connecting interface. The first solenoid valve 40 is arranged between the first connecting interface and the first gas cylinder 20, that is, the first solenoid valve 40 is used to control the on-off of the gas path connecting the gas analyzer 10 and the first gas cylinder 20. The second solenoid valve 50 is arranged between the first connecting interface and the second gas cylinder 30, that is, the second solenoid valve 50 is used to control the on-off of the gas path connecting the gas analyzer 10 and the second gas cylinder 30. In addition, the gas analysis device further includes a control module 60, which is respectively connected to the first solenoid valve 40 and the second solenoid valve 50 for communication. The control module 60 is used to switch the opening and closing states of the first solenoid valve 40 and the second solenoid valve 50 when it is detected that the air pressure at the gas outlet 201 of the first gas cylinder 20 is less than or equal to a preset critical value, so as to conduct the gas path between the gas analyzer 10 and the second gas cylinder 30, wherein it should be noted that the opening and closing states of the solenoid valves are open or closed. The control module 60 is also used to switch the opening and closing states of the first solenoid valve 40 and the second solenoid valve 50 when it is detected that the air pressure at the gas outlet 301 of the second gas cylinder 30 is less than or equal to a preset critical value, so as to conduct the gas path between the gas analyzer 10 and the first gas cylinder 20.

[0049] Exemplarily, assuming that the current gas supply scenario is that the first solenoid valve 20 is open, the second solenoid valve 30 is closed, and the first gas cylinder 20 is used to supply gas to the gas analyzer 10, then when the control module 60 detects that the gas pressure at the gas outlet 201 of the first gas cylinder 20 is less than or equal to the preset critical value, the first solenoid valve 40 is controlled to be closed, and the second solenoid valve 50 is controlled to be opened, that is, the second gas cylinder 30 is switched to supply gas to the gas analyzer 10. During the gas supply by the second gas cylinder 30, the tester is reminded to promptly update the first gas cylinder 20 to a new gas cylinder filled with the gas to be tested, so that when the control module 60 detects that the gas pressure at the gas outlet 301 of the second gas cylinder 30 is less than or equal to the preset critical value, the second solenoid valve 50 is controlled to be closed, and the first solenoid valve 40 is controlled to be opened, that is, the new first gas cylinder 20 is switched to supply gas to the gas analyzer 10.

[0050] In this way, compared with the traditional gas analysis method that requires manual switching of the gas supply line, the present application sets a first solenoid valve 40 on the gas line between the first gas cylinder 20 and the gas analyzer 10, and sets a second solenoid valve 50 on the gas line between the second gas cylinder 30 and the gas analyzer 10, and controls the first solenoid valve 40 and the second solenoid valve 50 to be opened or closed when the control module 60 detects that the air pressure at the gas outlet 201 of the first gas cylinder 20 or the gas outlet 301 of the second gas cylinder 30 is less than or equal to a preset critical value, so that when the air pressure at the gas outlet of one gas cylinder is less than or equal to the preset critical value, the other gas cylinder is automatically switched to supply gas to the gas analyzer, thereby realizing automatic switching of the two gas supply lines, avoiding the problem of analyzer shutdown due to manual failure to switch the gas supply line in time, and thereby improving the efficiency of analyzing engine exhaust gas.

[0051] Further, refer to Figure 2 In the second embodiment of the present utility model, the control module 60 includes a first pressure gauge 601 and a second pressure gauge 602:

[0052] The air inlet 6011 of the first pressure gauge 601 is in communication with the air outlet 201 of the first gas cylinder 20, and the air outlet 6012 of the first pressure gauge 601 is in communication with the air inlet 101 of the gas analyzer 10. The first pressure gauge 601 is used to trigger a first alarm signal when it is detected that the air pressure at the air outlet 201 of the first gas cylinder 20 is less than or equal to the preset critical value;

[0053] The gas inlet 6021 of the second pressure gauge 602 is connected to the gas outlet 301 of the second gas cylinder 30, and the gas outlet 6022 of the second pressure gauge 602 is connected to the gas inlet 101 of the gas analyzer 10. The second pressure gauge 602 is used to trigger a second alarm signal when it is detected that the gas pressure at the gas outlet 301 of the second gas cylinder 30 is less than or equal to the preset critical value;

[0054] The first solenoid valve 40 is disposed on the gas path between the first pressure gauge 601 and the first communication interface, and the second solenoid valve 50 is disposed on the gas path between the second pressure gauge 602 and the first communication interface.

[0055] In this embodiment, the control module 60 further includes a first pressure gauge 601 and a second pressure gauge 602. The air inlet 6011 of the first pressure gauge 601 is connected to the air outlet 201 of the first gas cylinder 20, and the air outlet 6012 of the first pressure gauge 601 is connected to the air inlet 101 of the gas analyzer 10. It should be understood that the gas in the first gas cylinder 20 flows through the first pressure gauge 601, and the first pressure gauge 601 can monitor the pressure of the gas flowing through its inner cavity, and the first pressure gauge 601 triggers an alarm signal (hereinafter referred to as the first alarm signal for distinction) when the air pressure at the air outlet 201 of the first gas cylinder 20 is less than or equal to a preset critical value, wherein the first alarm signal indicates that the gas remaining in the first gas cylinder 20 is insufficient. The air inlet 6021 of the second pressure gauge 602 is connected to the air outlet 301 of the second gas cylinder 30, and the air outlet 6022 of the second pressure gauge 602 is connected to the air inlet 101 of the gas analyzer 10. It should be understood that the gas in the second gas cylinder 30 flows through the second pressure gauge 602, and the second pressure gauge 602 can monitor the pressure of the gas flowing through its inner cavity, and the second pressure gauge 602 triggers an alarm signal (hereinafter referred to as the second alarm signal for distinction) when detecting that the gas pressure at the gas outlet 301 of the second gas cylinder 30 is less than or equal to a preset critical value, wherein the second alarm signal indicates that the gas remaining in the second gas cylinder 30 is insufficient. The first solenoid valve 40 is arranged on the gas path between the first pressure gauge 601 and the first communication interface, and the second solenoid valve 50 is arranged on the gas path between the second pressure gauge 602 and the first communication interface.

[0056] In a feasible implementation manner, both the first pressure gauge 601 and the second pressure gauge 602 are electric contact pressure gauges.

[0057] It should be noted that the electric contact pressure gauge is based on the spring tube in the measuring system. Under the pressure of the measured medium, the end of the spring tube is forced to produce a corresponding elastic deformation and displacement, which is amplified by the pull rod through the gear transmission mechanism, and the measured value is indicated on the dial by the indicator on the fixed gear (together with the contact). At the same time, when it contacts (breaks or closes) the contact (upper or lower limit) on the set pointer, the circuit in the control system is disconnected or connected to achieve the purpose of automatic control and alarm.

[0058] For example, when the first pressure gauge 601 detects that the air pressure at the outlet 201 of the first gas cylinder 20 is less than or equal to the preset critical value, the pointer drives the active output point of the electric contact device to contact the lower limit contact on the set pointer to conduct its internal control circuit to trigger the first alarm signal. Similarly, when the second pressure gauge 602 detects that the air pressure at the outlet 301 of the second gas cylinder 30 is less than or equal to the preset critical value, its internal control circuit is conducted to trigger the second alarm signal.

[0059] In this embodiment, the control module 60 further includes a micro control unit 603;

[0060] The micro control unit 603 is respectively connected to the first pressure gauge 601 and the second pressure gauge 602 for communication;

[0061] The micro control unit 603 is used to switch the opening and closing states of the first solenoid valve 40 and the second solenoid valve 50 based on the first alarm signal or the second alarm signal.

[0062] The control module 60 also includes a micro control unit 603, which is respectively connected to the first pressure gauge 601 and the second pressure gauge 602 in communication, that is, the micro control unit 603 can receive a first alarm signal from the first pressure gauge 601 and a second alarm signal from the second pressure gauge 602, and the micro control unit 603 is used to switch the opening and closing states of the first solenoid valve 40 and the second solenoid valve 50 based on the first alarm signal or the second alarm signal. Specifically, after receiving the first alarm signal, the micro control unit 603 controls the first solenoid valve 40 to close and controls the second solenoid valve 50 to open based on the first alarm signal; after receiving the second alarm signal, the micro control unit 603 controls the second solenoid valve 50 to close and controls the first solenoid valve 40 to open based on the second alarm signal. It should be noted that the micro control unit 603 switches the opening and closing states of the first solenoid valve 40 and the second solenoid valve 50 through a relay for controlling the solenoid valve.

[0063] In this embodiment, the gas analysis device further includes: a first pressure relief gas path A1, a second pressure relief gas path A2, a first pressure relief valve A3 and a second pressure relief valve A4;

[0064] One end of the first pressure relief gas path A1 is connected to the gas outlet 201 of the first gas cylinder 20, and the other end of the first pressure relief gas path A1 is connected to the outside atmosphere. The first pressure relief valve A3 is arranged on the first pressure relief gas path A1;

[0065] One end of the second pressure relief gas path A2 is connected to the gas outlet 301 of the second gas cylinder 30, and the other end of the second pressure relief gas path A2 is connected to the outside atmosphere. The second pressure relief valve A4 is arranged on the second pressure relief gas path A2;

[0066] The first solenoid valve 40 is arranged on the connecting gas path between the first connecting interface and the second connecting interface, and the second solenoid valve 50 is arranged on the connecting gas path between the first connecting interface and the third connecting interface, wherein the second connecting interface is the connecting interface between the first pressure relief gas path A1 and the first gas cylinder 20, and the third connecting interface is the connecting interface between the second pressure relief gas path A2 and the second gas cylinder 30.

[0067] It should be noted that the communication interface between the first pressure relief gas circuit A1 and the first gas cylinder 20 is referred to as the second communication interface for distinction, and the communication interface between the second pressure relief gas circuit A2 and the second gas cylinder 30 is referred to as the third communication interface for distinction.

[0068] The gas analysis device also includes a first pressure relief gas circuit A1, a second pressure relief gas circuit A2, a first pressure relief valve A3 and a second pressure relief valve A4. One end of the first pressure relief gas circuit A1 is connected to the gas outlet 201 of the first gas cylinder 20, the other end of the first pressure relief gas circuit A1 is connected to the outside atmosphere, and the first pressure relief valve A3 is arranged on the first pressure relief gas circuit A1, and is used to control the opening and closing of the first pressure relief gas circuit A1. One end of the second pressure relief gas circuit A2 is connected to the gas outlet 301 of the second gas cylinder 30, the other end of the second pressure relief gas circuit A2 is connected to the outside atmosphere, and the second pressure relief valve A4 is arranged on the second pressure relief gas circuit A2, and is used to control the opening and closing of the second pressure relief gas circuit A2. In addition, the first solenoid valve 40 is arranged on the connecting gas path between the first connecting interface and the above-mentioned second connecting interface, and the second solenoid valve 50 is arranged on the connecting gas path between the first connecting interface and the above-mentioned third connecting interface.

[0069] In this embodiment, the micro control unit 603 is communicatively connected with the first pressure relief valve A3 and the second pressure relief valve A4, and the micro control unit 603 is also used to switch the opening and closing state of the first pressure relief valve A3 based on the first alarm signal, and to switch the opening and closing state of the second pressure relief valve A4 based on the second alarm signal.

[0070] The micro control unit 603 is respectively connected to the first pressure relief valve A3 and the second pressure relief valve A4 for communication. The micro control unit 603 is also used to switch the opening and closing state of the first pressure relief valve A3 based on the first alarm signal, and to switch the opening and closing state of the second pressure relief valve A4 based on the second alarm signal.

[0071] It should be noted that, since the gas pressure used in gas analysis is relatively high, even when the gas pressure at the gas outlet of the first gas cylinder 20 or the second gas cylinder 30 is less than or equal to the preset critical value, high-pressure gas will still remain in the gas path between the first solenoid valve 40 and the first gas cylinder 20 or the gas path between the second solenoid valve 50 and the second gas cylinder 30. Therefore, the embodiment of the present application sets a first pressure relief gas path A1 and a first pressure relief valve A3, so that the control module 60 controls the first solenoid valve 40 to be closed based on the first alarm signal, and then controls the first pressure relief valve A3 to be opened. After a preset time, the first pressure relief valve A3 is controlled to be closed, thereby releasing the gas remaining in the gas circuit based on the first pressure relief gas circuit A1, wherein the preset time is the shortest time that can ensure that the gas pressure in the gas circuit is consistent with the atmospheric pressure; similarly, the embodiment of the present application also sets a second pressure relief gas circuit A2 and a second pressure relief valve A4, so that after the control module 60 controls the second solenoid valve 50 to be closed based on the second alarm signal, the second pressure relief valve A4 is controlled to be opened, and then the second pressure relief valve A4 is controlled to be closed after a preset time, thereby releasing the gas remaining in the gas circuit based on the second pressure relief gas circuit A2. It should be noted that the micro control unit 603 switches the opening and closing states of the first pressure relief valve A3 and the second pressure relief valve A4 through the solenoid valve control relay, wherein it should be noted that the opening and closing states of the pressure relief valves are open or closed.

[0072] That is to say, the embodiment of the present application releases the high-pressure gas remaining in the gas path between the gas cylinder with insufficient gas remaining and the solenoid valve by setting up the first pressure relief gas path A1 and the second pressure relief gas path A2, thereby ensuring the safety of the tester when replacing the gas cylinder with insufficient gas remaining.

[0073] Further, in the third embodiment of the present utility model, referring to Figure 3 The gas analysis device also includes a pressure regulating valve B1, which is arranged on the gas path between the first communication interface and the gas analyzer 10.

[0074] In this embodiment, the gas analysis device also includes a pressure regulating valve B1, which is arranged on the gas path between the first connecting interface and the gas analyzer 10, and the pressure regulating valve B1 is used to adjust the pressure of the gas input into the gas analyzer 10 to ensure that the pressure of the input gas meets the pressure requirement of the gas analyzer 10 for the input gas.

[0075] In one feasible implementation, the gas analysis device includes a single gas analyzer 10 and a single pressure regulating valve B1. Specifically, the pressure regulating valve B1 is disposed between the gas inlet 101 of the gas analyzer 10 and the first connecting interface to adjust the pressure of the gas input into the gas analyzer 10.

[0076] It should be noted that the embodiment of the present application takes into account that in the site where vehicle gas analysis is performed, there is a certain distance between the gas analyzer 10 and the gas supply cylinder, which will to a certain extent cause the air pressure input to the air inlet of the gas analyzer 10 to be lower than the air pressure at the air outlet of the gas supply cylinder, thereby resulting in the inability to meet the gas analyzer 10's input gas pressure requirements. Therefore, before the working gas enters the gas analyzer 10, the input gas is first pressure-regulated by the pressure regulating valve B1 to ensure that the gas input into the gas analyzer 10 meets the gas analyzer 10's input gas pressure requirements.

[0077] In another possible implementation, referring to Figure 4 , the gas analysis device comprises at least two gas analyzers 10;

[0078] The gas inlet 101 of each of the gas analyzers 10 is respectively connected to the gas outlet 201 of the first gas cylinder 20, and the fourth communication interface is connected to the gas outlet of the second gas cylinder 30, wherein the fourth communication interface is the communication interface between each of the gas analyzers 10 and the first gas cylinder 20;

[0079] The first solenoid valve 40 is disposed between the fourth communication interface and the first gas cylinder 20 , and the second solenoid valve 50 is disposed between the fourth communication interface and the second gas cylinder 30 .

[0080] The gas analysis device includes at least two gas analyzers 10, and the gas inlet 101 of each gas analyzer 10 is respectively connected to the gas outlet 201 of the first gas cylinder 20, and the communication interface between each gas analyzer 10 and the first gas cylinder 20 is called the fourth communication interface for distinction, and the fourth communication interface is connected to the gas outlet 301 of the second gas cylinder 30, that is, the gas inlet 101 of each gas analyzer 10 is respectively connected to the gas outlet 301 of the second gas cylinder 30. In addition, the first solenoid valve 40 is arranged between the fourth communication interface and the first gas cylinder 20, and the second solenoid valve 50 is arranged between the fourth communication interface and the second gas cylinder 30.

[0081] In this embodiment, the gas analysis device further includes at least one pressure regulating valve B1 , and the fourth communication interface is connected to the gas inlet 101 of at least one gas analyzer 10 via the at least one pressure regulating valve B1 .

[0082] The gas analysis device further includes at least one pressure regulating valve B1 , and the fourth communication interface is connected to the gas inlet 101 of at least one gas analyzer 10 via the at least one pressure regulating valve B1 .

[0083] Exemplarily, when the gas analysis device includes at least two gas analyzers 10 and at least one pressure regulating valve B1, one gas analyzer 10 may be connected to one pressure regulating valve B1, or multiple gas analyzers 10 may be connected to one pressure regulating valve B1, that is, one pressure regulating valve B1 is connected to the gas inlet 101 of at least one gas analyzer 10. It should be noted that the pressure regulating valve B1 is used to adjust the pressure of the input gas to a preset target pressure. When the pressure regulating valve B1 is connected to a single gas analyzer 10, the target pressure of the pressure regulating valve B1 is the lower limit of the pressure requirement range of the input gas by the gas analyzer 10; when the pressure regulating valve B1 is connected to multiple gas analyzers 10, the target pressure of the pressure regulating valve B1 is the maximum value of the lower limits required by each gas analyzer 10.

[0084] Thus, the embodiment of the present application sets a pressure regulating valve B1 in the gas analysis device to further ensure that the pressure of the gas input to the gas analyzer 10 meets the normal operation requirements of the gas analyzer 10, thereby preventing the gas analyzer 10 from stopping working due to underpressure or gas outage of the working gas.

[0085] Further, refer to Figure 5 , in the fourth embodiment of the utility model, the gas analysis device further comprises an alarm module C1;

[0086] The alarm module C1 includes a remote alarm unit C11 and an audible and visual alarm unit C12, and the alarm module C1 is respectively connected to the first pressure gauge 601 and the second pressure gauge 602 for communication;

[0087] The alarm module C1 is used to control the remote alarm unit C11 and the sound and light alarm unit C12 to alarm based on the first alarm signal or the second alarm signal.

[0088] In this embodiment, the gas analysis device further includes an alarm module C1, which includes a remote alarm unit C11 and an audible and visual alarm unit C12. The alarm module C1 is respectively connected to the first pressure gauge 601 and the second pressure gauge 602 for communication, and the alarm module C1 is used to control the remote alarm unit C11 and the audible and visual alarm unit C12 to alarm based on the first alarm signal or the second alarm signal. Specifically, the remote alarm unit C11 is used to send an alarm message to the user terminal to remind the user that the first gas cylinder 20 or the second gas cylinder 30 needs to be replaced. The audible and visual alarm unit C1 is an audible and visual alarm device used to remind the user to replace the gas cylinder.

[0089] In a specific embodiment, when the current gas supply cylinder is the first gas cylinder 20, when the first pressure gauge 601 detects that the gas pressure at the gas outlet 201 of the first gas cylinder 20 is less than or equal to a preset critical value, a first alarm signal is sent to the micro control unit 603 and the alarm module C1, and the alarm module C1 triggers the remote alarm unit C11 and the sound and light alarm unit C12 to alarm, so as to remind the tester to replace the gas cylinder; the micro control unit 603 controls the first solenoid valve 40 to close through the solenoid valve control circuit, and controls the second solenoid valve 50 to open, and then controls the first pressure relief valve A3 to open, and controls the first pressure relief valve A3 to close after the first pressure relief valve A3 is continuously opened for a preset period of time.

[0090] In this way, the embodiment of the present application realizes that when insufficient gas is detected in the gas supply cylinder, the remote alarm unit C11 and the sound and light alarm unit C12 will sound an alarm at the same time, so as to promptly remind the tester to replace the gas cylinder.

[0091] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A gas analysis device, characterized in that: The gas analysis device includes: a gas analyzer, a first gas cylinder, a second gas cylinder, a first solenoid valve, a second solenoid valve and a control module; The gas inlet of the gas analyzer is connected to the gas outlets of the first gas cylinder and the second gas cylinder respectively, the first solenoid valve is arranged between the first communication interface and the first gas cylinder, and the second solenoid valve is arranged between the first communication interface and the second gas cylinder, wherein the first communication interface is a communication interface between the gas analyzer, the first gas cylinder and the second gas cylinder; The control module is communicatively connected to the first solenoid valve and the second solenoid valve respectively, and is used to switch the opening and closing states of the first solenoid valve and the second solenoid valve when it is detected that the gas pressure at the gas outlet of the first gas cylinder is less than or equal to a preset critical value, so as to open the gas path between the gas analyzer and the second gas cylinder, and to switch the opening and closing states of the first solenoid valve and the second solenoid valve when it is detected that the gas pressure at the gas outlet of the second gas cylinder is less than or equal to the preset critical value, so as to open the gas path between the gas analyzer and the first gas cylinder.

2. The gas analysis device according to claim 1, wherein The control module includes a first pressure gauge and a second pressure gauge: The air inlet of the first pressure gauge is connected to the air outlet of the first gas cylinder, and the air outlet of the first pressure gauge is connected to the air inlet of the gas analyzer, and the first pressure gauge is used to trigger a first alarm signal when the air pressure at the air outlet of the first gas cylinder is less than or equal to the preset critical value; The gas inlet of the second pressure gauge is connected to the gas outlet of the second gas cylinder, and the gas outlet of the second pressure gauge is connected to the gas inlet of the gas analyzer. The second pressure gauge is used to trigger a second alarm signal when it monitors that the gas pressure at the gas outlet of the second gas cylinder is less than or equal to the preset critical value; The first solenoid valve is provided on the gas path between the first pressure gauge and the first communication interface, and the second solenoid valve is provided on the gas path between the second pressure gauge and the first communication interface.

3. The gas analysis device according to claim 2, wherein: The first pressure gauge and the second pressure gauge are both electric contact pressure gauges.

4. The gas analysis device according to claim 2, wherein: The control module also includes a micro control unit; The micro control unit is communicatively connected to the first pressure gauge and the second pressure gauge respectively; The micro control unit is used to switch the opening and closing states of the first solenoid valve and the second solenoid valve based on the first alarm signal or the second alarm signal.

5. The gas analysis device according to claim 4, wherein The gas analysis device further includes: a first pressure relief gas path, a second pressure relief gas path, a first pressure relief valve and a second pressure relief valve; One end of the first pressure relief gas path is connected to the gas outlet of the first gas cylinder, the other end of the first pressure relief gas path is connected to the outside atmosphere, and the first pressure relief valve is provided on the first pressure relief gas path; One end of the second pressure relief gas path is connected to the gas outlet of the second gas cylinder, the other end of the second pressure relief gas path is connected to the outside atmosphere, and the second pressure relief valve is provided on the second pressure relief gas path; The first solenoid valve is arranged on the connecting air path between the first connecting interface and the second connecting interface, and the second solenoid valve is arranged on the connecting air path between the first connecting interface and the third connecting interface, wherein the second connecting interface is the connecting interface between the first pressure relief air path and the first gas cylinder, and the third connecting interface is the connecting interface between the second pressure relief air path and the second gas cylinder.

6. The gas analysis device according to claim 5, wherein The micro control unit is respectively connected to the first pressure relief valve and the second pressure relief valve for communication, and is further configured to switch the opening and closing state of the first pressure relief valve based on the first alarm signal, and to switch the opening and closing state of the second pressure relief valve based on the second alarm signal.

7. The gas analysis device according to claim 1, wherein The gas analysis device further includes a pressure regulating valve, which is arranged on the gas path between the first communication interface and the gas analyzer.

8. The gas analysis device according to claim 1, wherein The gas analysis device includes at least two gas analyzers; The gas inlet of each gas analyzer is connected to the gas outlet of the first gas cylinder, and the fourth communication interface is connected to the gas outlet of the second gas cylinder, wherein the fourth communication interface is the communication interface between each gas analyzer and the first gas cylinder; The first solenoid valve is arranged between the fourth communication interface and the first gas cylinder, and the second solenoid valve is arranged between the fourth communication interface and the second gas cylinder.

9. The gas analysis device according to claim 8, wherein The gas analysis device further includes at least one pressure regulating valve, and the fourth communication interface is connected to the gas inlet of at least one gas analyzer via the at least one pressure regulating valve.

10. The gas analysis device according to claim 2, wherein The gas analysis device further includes an alarm module; The alarm module includes a remote alarm unit and an audible and visual alarm unit, and the alarm module is communicatively connected to the first pressure gauge and the second pressure gauge respectively; The alarm module is used to control the remote alarm unit and the sound and light alarm unit to sound an alarm based on the first alarm signal or the second alarm signal.

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