Multifunctional gas detector

Abstract

The invention discloses a multifunctional gas detector. The multifunctional gas detector comprises a detector body; the power supply is used for supplying power to the detector body and comprises an alternating-current power supply and a bias direct-current power supply; accordingly, in the alternating current power supply and the bias direct current power supply, when at least the alternating current power supply supplies power, the multifunctional gas detector serves as a PDECD detector, and when the alternating current power supply is grounded and the bias direct current power supply supplies power, the multifunctional gas detector serves as a PDHID detector or a DID detector. According to different detection requirements, the multifunctional gas detector can be used as a PDECD detector, a PDHID detector or a DID detector, so that the detection function of the multifunctional gas detector is increased, the application range of the multifunctional gas detector is widened, multiple purposes are realized, various types of detectors do not need to be purchased, and the economic cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detectors, and in particular to a multifunctional gas detector. Background Art

[0002] A gas detector is a device used to detect gas and is widely used in the gas industry.

[0003] In the prior art, common gas detectors include discharge ionization detector (DID), electron capture detector (ECD), pulsed discharge electron capture detector (PDECD), photo ionization detector (PID), and pulsed discharge helium ionization detector (PDHID).

[0004] Existing detectors have relatively simple functions and a fixed scope of use. If the detection object changes, other types of detectors need to be used. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing detectors have a single function, and the purpose is to provide a multifunctional gas detector to solve the above problem.

[0006] The present invention is achieved through the following technical solutions:

[0007] A multifunctional gas detector comprising:

[0008] Detector body;

[0009] A power supply for supplying power to the detector body, including an AC power supply and a bias DC power supply;

[0010] Correspondingly, among the AC power supply and the biased DC power supply, when at least the AC power supply is powered, the multifunctional gas detector is used as a PDECD detector; when the AC power supply is grounded and the biased DC power supply is powered, the multifunctional gas detector is used as a PDHID detector or a DID detector.

[0011] In one possible design, the AC power source includes a first power source and a first electrode;

[0012] The first power supply uses a high-frequency and high-voltage power supply;

[0013] Two first electrodes are provided and are both provided on the detector body. Accordingly, the first electrodes have two opposite ends, one end of which is connected to the first power supply via a first wire, and the other end is provided in the inner cavity and spaced apart from the adjacent first electrodes to form a discharge interval;

[0014] Accordingly, of the two first electrodes, the one located upstream of the discharge interval is selected as a PN electrode.

[0015] In one possible design, the first electrode includes an electrode body and a conductive wire. The electrode body is configured as a shaft and is passed through the detector body. The conductive wire is passed through the electrode body. Accordingly, one end of the conductive wire is connected to the first wire, and the other end of the conductive wire extends into the inner cavity to form a discharge junction.

[0016] Correspondingly, in the PN electrode, a zirconium-platinum-silicon electrode is provided on the electrode body, one end of the zirconium-platinum-silicon electrode is connected to the first wire through a conductive wire, and the other end of the zirconium-platinum-silicon electrode is connected to the discharge junction.

[0017] In a possible design, a magnetic attraction member is provided outside the detector body, and the magnetic attraction member attracts the conductive wire through magnetic force to drive the first electrode to move back and forth along the detector body.

[0018] In a possible design, the magnetic attraction member is provided with two working ends, or the magnetic attraction member is provided with two ends, so as to attract the two first electrodes respectively, so as to make the two first electrodes move synchronously or asynchronously.

[0019] In one possible design, the bias DC power supply includes a second power supply and a second electrode, wherein the second power supply is a DC power supply; the second electrode includes a ground electrode and two bias electrodes, and all three electrodes are arranged on the detector body and connected to the second power supply through a second wire.

[0020] In one possible design, when the multifunctional gas detector is used as a PDECD detector, the external output voltage of the second power supply does not exceed 450V; when the multifunctional gas detector is used as a PDHID detector or a DID detector, the external output voltage of the second power supply is 2000-4500V.

[0021] In one possible design, an inner cavity is provided in the detector body, and a sample gas inlet, a reference gas inlet, a nitrogen gas inlet, a signal outlet and an air outlet are provided on the detector body;

[0022] The inner cavity is divided into the discharge zone, ionization zone, ion collection zone and gas outlet zone in sequence. Correspondingly, the reference gas inlet and the nitrogen gas inlet are connected to the discharge zone, the sample gas inlet is connected to the ionization zone, the signal outlet is connected to the ion collection zone, and the gas outlet is connected to the gas outlet zone and the outside world.

[0023] The sample gas inlet, reference gas inlet, nitrogen gas inlet, signal outlet and gas outlet are respectively provided with gas pipes;

[0024] Correspondingly, the first electrode is provided on the detector body and extends to the discharge region, and the second electrode is provided on the detector body and extends to the ionization region.

[0025] In one possible design, when the multifunctional gas detector is used as a PDECD detector, gas is introduced into the sample gas inlet, the reference gas inlet, and the nitrogen gas inlet;

[0026] When the multifunctional gas detector is used as a PDHID detector or a DID detector, the sample gas inlet is normally supplied with gas, the reference gas inlet is optionally supplied with gas, and the nitrogen inlet does not need to be supplied with nitrogen.

[0027] In one possible design, the inner cavity is constructed as a circular cavity or a cylindrical cavity, the width of the discharge zone is adapted to the width of the inner cavity, the length is 1-100 mm, and the height is 0.5-100 mm; the width of the ionization zone is adapted to the width of the inner cavity, the length is 1-100 mm, and the height is 0.5-100 mm.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] Depending on the detection requirements, the multifunctional gas detector can be used as a PDECD detector, a PDHID detector or a DID detector, which increases the detection function of the multifunctional gas detector, broadens the scope of use of the multifunctional gas detector, and realizes multiple uses of one item. There is no need to purchase multiple types of detectors, which helps to reduce economic costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0031] Figure 1 This is a structural diagram of a multifunctional gas detector.

[0032] Figure 2 This is a schematic diagram of the assembly of the AC power supply and the detector body. At the first electrode in the figure, the yellow-green cylindrical part represents the zirconium-platinum-silicon electrode, and the red cylindrical part represents the conductive wire.

[0033] Figure 3 Schematic diagram of the assembly of the bias DC power supply and the detector body.

[0034] Markings and corresponding parts names in the accompanying drawings:

[0035] 100. Detector body; 101. Inner cavity; 102. Sample gas inlet; 103. Reference gas inlet; 104. Nitrogen gas inlet; 105. Signal outlet; 106. Gas outlet; 107. Discharge region; 108. Ionization region; 109. Ion collection region; 110. Gas outlet region; 111. Protective shell; 200. Power supply; 210. AC power supply; 211. First power supply; 212. First electrode; 213. First wire; 201. Electrode body; 202. Conductive wire; 203. Zirconium-platinum-silicon electrode; 220. Bias DC power supply; 221. Second power supply; 222. Second electrode; 223. Second wire. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0037] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0038] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0040] Example:

[0041] like Figure 1-Figure 3 As shown, a multifunctional gas detector comprises:

[0042] Detector body 100;

[0043] A power supply 200 for supplying power to the detector body 100, comprising an AC power supply 210 and a bias DC power supply 220;

[0044] Accordingly, among the AC power supply 210 and the bias DC power supply 220, when at least the AC power supply 210 is powered, the multifunctional gas detector is used as a PDECD detector; when the AC power supply 210 is grounded and the bias DC power supply 220 is powered, the multifunctional gas detector is used as a PDHID detector or a DID detector.

[0045] Among them, the PDECD detector is a non-radioactive electron capture detector, a type of electron capture detector. The PDHID detector is a pulsed discharge helium ionization detector, and the DID detector is a discharge ionization detector.

[0046] In the multifunctional gas detector, electrical energy is supplied by a power supply 200, which is then discharged into the inner cavity 101 of the detector body 100 through a discharge circuit on the detector body 100. When the voltage is high enough, a circular discharge of helium occurs around the electrodes of the discharge circuit. This circular discharge forms a discharge current, which generates a high-energy light beam in the inner cavity 101 of the detector body 100. The high-energy light beam irradiates the gas entering the inner cavity 101, ionizing it and generating ions. The ions collide inelastically with impurity molecules in the gas, ionizing the impurity molecules. The ionized impurity molecules move along the inner cavity 101 until the detector body 100 collects the ionized impurity molecules and forms a current. Since the current is proportional to the impurity concentration in the material, the electrical signal collected by the detector body 100 is amplified and recorded to obtain the spectrum peak of the measured component.

[0047] When at least AC power supply 210 is supplied, sample gas, reference gas, and nitrogen gas are simultaneously introduced into detector body 100, preferably high-purity nitrogen gas. In this case, the multifunctional gas detector functions as a PDECD detector. Furthermore, when the electrical signal collected by detector body 100 is weak, i.e., the detection sensitivity is low, bias DC power supply 220 can be activated to increase the input electrical energy, thereby achieving a better ionization effect. This strengthens the electrical signal collected by detector body 100 and improves detection sensitivity.

[0048] It is worth noting that if the multifunctional gas detector is used as a PDECD detector, the bias DC power supply 220 is used to supplement the energy input into the inner cavity 101, and the supply voltage of the bias DC power supply 220 is much smaller than that of the AC power supply 210 to avoid excessive voltage.

[0049] When the AC power supply 210 is grounded and the bias DC power supply 220 is supplying power, that is, the AC power supply 210 does not supply power to the detector body 100, and only the bias DC power supply 220 supplies power to the detector body 100. In this case, the voltage of the bias DC power supply 220 must be sufficiently high to ensure ionization within the inner cavity 101 of the detector body 100. Simultaneously, sample gas and, optionally, reference gas are introduced into the detector body 100, without the need for nitrogen. Based on this, the multifunctional gas detector can be used as either a PDHID detector or a DID detector, depending on the detection requirements.

[0050] In summary, depending on the detection requirements, the multifunctional gas detector can be used as a PDECD detector, a PDHID detector or a DID detector, which increases the detection function of the multifunctional gas detector, broadens the scope of use of the multifunctional gas detector, and realizes multiple uses of one item. There is no need to purchase multiple types of detectors, which helps to reduce economic costs.

[0051] In one possible implementation, the AC power source 210 includes a first power source 211 and a first electrode 212;

[0052] The first power supply 211 uses a high-frequency high-voltage power supply 200;

[0053] Two first electrodes 212 are provided and are both disposed on the detector body 100. Accordingly, the first electrode 212 has two opposite ends, one end of which is connected to the first power supply 211 via a first wire 213, and the other end is disposed in the inner cavity 101 and spaced apart from the adjacent first electrode 212 to form a discharge interval.

[0054] Accordingly, of the two first electrodes 212 , the one located upstream of the discharge interval is a PN electrode.

[0055] Based on the above design scheme, the first power supply 211 supplies high-frequency alternating current. Since the first electrode 212 includes a PN electrode, the structure of the PN electrode is similar to a PN junction, which makes the PN electrode have unidirectional conductivity. Therefore, in the loop, the PN electrode is used to rectify and stabilize the alternating current, so that the alternating current is converted into direct current. As a result, the alternating current can be used to power the gas detector, thereby increasing the energy supply options of the gas detector.

[0056] The first electrode 212 is located at one end of the inner chamber 101. The two first electrodes 212 are spaced apart to form a gap. Because the voltage of the first power source 211 is sufficiently high, the first power source 211 discharges to the outside during the discharge interval, ionizing the gas in the inner chamber 101. Furthermore, because the gap between the two first electrodes 212 is small, it does not affect the continuity of the entire circuit, allowing the first power source 211 to continuously discharge to the outside during the discharge interval. Consequently, the AC power source 210 can continuously ionize the gas in the inner chamber 101 after supplying power.

[0057] Optionally, the frequency of the first power supply 211 is 1-100 kHz, the voltage is 300-5000 V, and the current is 0.5-100 mA. Based on the above design, according to the specific detection requirements, the first power supply 211 selects an adaptive frequency, voltage, and current to ensure the smooth progress of the detection and the accuracy of the detection results. It also enables the first power supply 211 to meet the requirements of different detections for the power supply 200, and has better adaptability and practicality.

[0058] Optionally, the first electrode 212 includes an electrode body 201 and a conductive wire 202. The electrode body 201 is configured as a shaft and is passed through the detector body 100. The conductive wire 202 is passed through the electrode body 201. Accordingly, one end of the conductive wire 202 is connected to the first wire 213, and the other end of the conductive wire 202 extends into the inner cavity 101 to form a discharge junction.

[0059] Correspondingly, in the PN electrode, a zirconium-platinum-silicon electrode 203 is provided on the electrode body 201 , one end of the zirconium-platinum-silicon electrode 203 is connected to the first wire 213 through the conductive wire 202 , and the other end of the zirconium-platinum-silicon electrode 203 is connected to the discharge junction.

[0060] Based on the above design scheme, the outer periphery of the electrode body 201 is connected to the detector body 100 through an insulating sealant. The insulating sealant is made of quartz. The inner periphery of the electrode body 201 is provided with mounting holes adapted for the conductive wire 202 and / or the zirconium platinum silicon electrode 203, thereby connecting the first wire 213 and forming a loop with the first power supply 211.

[0061] The conductive wire 202 can be any suitable alloy wire. Preferably, the first wire 213 extends into the electrode body 201 and replaces the conductive wire 202 to reduce the number of components and eliminate the connection point between the conductive wire 202 and the first wire 213 .

[0062] In the PN electrode, the zirconium platinum silicon electrode 203 accelerates the frequency and amplifies the voltage, which helps improve the ionization effect and also helps reduce the voltage requirement of the first power supply 211. At the same time, the zirconium platinum silicon electrode 203 also converts AC power into DC power.

[0063] Preferably, a magnetic element is provided outside the detector body 100 , and the magnetic element attracts the conductive wire 202 through magnetic force to drive the first electrode 212 to move back and forth along the detector body 100 .

[0064] Based on the above design, the first electrode 212 reciprocates, driving the discharge interval within the inner cavity 101 of the detector body 100, thereby varying the distance between the discharge interval and the bias DC power supply 220. When the distance between the discharge interval and the bias DC power supply 220 is smaller, ionized molecules are not only more likely to migrate to the discharge point of the bias DC power supply 220 in the inner cavity 101, but also experience less energy loss during migration. After being reionized by the bias DC power supply 220, the ionized molecules have increased energy and can be detected by the detector body 100, thereby improving the detection sensitivity of the detector body 100.

[0065] In addition, the magnetic force of the magnetic attraction member can also be used for filtering. After the AC power supply 210 is rectified by the PN electrodes, the pulsating components are further eliminated through magnetic field filtering, thereby improving the quality of the converted DC power.

[0066] It should be noted that when the multifunctional gas detector is used as a detector of different types, the first electrode 212 is moved to a suitable position to adapt to the structural features of the different types of detectors, so as to achieve the purpose of improving detection quality and ensuring detection accuracy.

[0067] Furthermore, the magnetic element is provided with two working ends, or two magnetic elements are provided, to respectively attract the two first electrodes 212, thereby causing the two first electrodes 212 to move synchronously or asynchronously. Based on the above design, the flexibility of the movement of the first electrodes 212 is greatly increased to adapt to different detection requirements, greatly expanding the detection range and detection sensitivity of the multifunctional gas detector.

[0068] In one possible implementation, the bias DC power supply 220 includes a second power supply 221 and a second electrode 222, wherein the second power supply 221 selects the DC power supply 200; the second electrode 222 includes a ground electrode and two bias electrodes, and all three electrodes are arranged on the detector body 100 and connected to the second power supply 221 through a second wire 223.

[0069] Based on the above design, the bias DC power supply 220 has two operating modes. Specifically:

[0070] First, when the multifunctional gas detector is used as a PDECD detector, the AC power supply 210 serves as the primary power supply 200, and the bias DC power supply 220 serves as the auxiliary power supply 200. When the detector body 100 fails to detect the object being detected, i.e., the sensitivity of the detector body 100 is low, the second power supply 221 is activated to increase pressure and achieve re-ionization. At this time, the output voltage of the second power supply 221 does not exceed 450V. In actual use, the voltage of the second power supply 221 is 100-450V.

[0071] Second, when the multifunctional gas detector is used as a PDHID or DID detector, the bias DC power supply 220 serves as the primary power supply 200. In this case, the voltage of the secondary power supply 221 must be sufficiently high to ensure gas ionization. The output voltage of the secondary power supply 221 is 2000-4500V.

[0072] Based on this, the voltage of the second power supply 221 is ±100-4500V, and the current is 0.1-4mA. Based on the above design, according to the specific detection requirements, the second power supply 221 selects the appropriate voltage and current to ensure the smooth progress of the detection and the accuracy of the test results. It also enables the second power supply 221 to meet the requirements of different tests on the power supply 200, and has better adaptability and practicality.

[0073] The second electrode 222 is connected to the second power supply 221 via a second wire 223 to form a loop. At the same time, the second electrode 222 discharges to the inner cavity 101 to achieve secondary excitation of the gas in the inner cavity 101 and achieve re-ionization.

[0074] In one possible implementation, the detector body 100 is provided with an inner cavity 101 , and the detector body 100 is provided with a sample gas inlet 102 , a reference gas inlet 103 , a nitrogen gas inlet 104 , a signal outlet 105 and an air outlet 106 ;

[0075] The inner cavity 101 is divided into a discharge region 107, an ionization region 108, an ion collection region 109, and a gas outlet region 110. Correspondingly, the reference gas inlet 103 and the nitrogen gas inlet 104 are connected to the discharge region 107, the sample gas inlet 102 is connected to the ionization region 108, the signal outlet 105 is connected to the ion collection region 109, and the gas outlet 106 is connected to the gas outlet region 110 and the outside world.

[0076] The sample gas inlet 102, the reference gas inlet 103, the nitrogen gas inlet 104, the signal outlet 105 and the gas outlet 106 are respectively provided with gas pipes;

[0077] Correspondingly, the first electrode 212 is disposed on the detector body 100 and extends to the discharge region 107 , and the second electrode 222 is disposed on the detector body 100 and extends to the ionization region 108 .

[0078] Based on the above design, within the inner chamber 101, the discharge region 107 is used by the AC power supply 210 to ionize the gas, while the ionization region 108 is used by the DC power supply 220 to bias the gas. These two regions function identically, differing only in their locations. The ionized gas flows into the ion collection region 109, where it is collected and processed to produce a test result. After passing through the ion collection region 109, the gas enters the outlet region 110 and is discharged through the outlet 106.

[0079] Preferably, if Figure 1 As shown, the detector body 100 is vertically arranged, the inner cavity 101 is vertical, and the discharge region 107, ionization region 108, ion collection region 109 and gas outlet region 110 are arranged in order from top to bottom. Based on this, the gas flow is guided by gravity so that the gas flow direction meets the design requirements.

[0080] The sample gas inlet 102 is the chromatographic inlet, which is used to introduce the gas to be detected into the inner cavity 101. The reference gas inlet 103 is used to introduce reference gas, and the gas type suitable for the detector type and the gas to be detected can be selected. The nitrogen inlet 104 is used to introduce high-purity nitrogen.

[0081] Optionally, in general, the reference gas is an inert gas or an organic gas.

[0082] It is worth noting that when the multifunctional gas detector is used as a PDECD detector, gas is introduced into the sample gas inlet 102, the reference gas inlet 103 and the nitrogen inlet 104; when the multifunctional gas detector is used as a PDHID detector or a DID detector, gas is normally introduced into the sample gas inlet 102, gas is introduced into the reference gas inlet 103 as appropriate, and nitrogen does not need to be introduced into the nitrogen inlet 104.

[0083] Alternatively, as Figure 1As shown, the gas pipe of the sample gas inlet 102 passes through the gas outlet region 110 and the ion collecting region 109 from bottom to top, so that the outlet of the gas pipe is located in the ionization region 108. Based on this, on the one hand, it helps to reduce the volume of the detector body 100 and realize the miniaturization of the detector body 100, and on the other hand, it effectively prevents unionized gas from entering the signal outlet 105 and the gas outlet 106. The former ensures the accuracy of the detection results, and the latter avoids the waste of gas.

[0084] In one possible implementation, the inner cavity 101 is constructed as a circular cavity or a cylindrical cavity, the width of the discharge zone 107 is adapted to the width of the inner cavity 101, the length is 1-100 mm, and the height is 0.5-100 mm; the width of the ionization zone 108 is adapted to the width of the inner cavity 101, the length is 1-100 mm, and the height is 0.5-100 mm.

[0085] Based on the above design, the inner cavity 101 is basically circular in shape to reduce dead volume for gas flow, minimizing or even eliminating its effect on peak expansion, thereby maximizing detection accuracy. By combining the sizes of the discharge region 107 and ionization region 108, the multifunctional gas detector can be designed in multiple sizes for use in different detection scenarios.

[0086] It is worth noting that the first electrode 212 can move back and forth in the discharge region 107 under the action of the magnetic attraction member, but the movement range of the first electrode 212 should not exceed the range of the discharge region 107 .

[0087] In one possible implementation, the detector body 100 is provided with a protective shell 111, which is a metal shell. Based on the above design, the protective shell 111 protects the detector body 100 and related equipment, thereby increasing the service life of the multifunctional gas detector.

[0088] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional gas detector, characterized in that: include: Detector body (100); A power supply (200) for supplying power to the detector body (100), comprising an AC power supply (210) and a bias DC power supply (220); Correspondingly, among the AC power supply (210) and the bias DC power supply (220), when at least the AC power supply (210) supplies power, the multifunctional gas detector functions as a PDECD detector; and when the AC power supply (210) is grounded and the bias DC power supply (220) supplies power, the multifunctional gas detector functions as a PDHID detector or a DID detector.

2. The multifunctional gas detector according to claim 1, characterized in that: The AC power source (210) includes a first power source (211) and a first electrode (212); The first power source (211) is a high-frequency high-voltage power source (200); Two first electrodes (212) are provided and are both arranged on the detector body (100). Accordingly, the first electrode (212) has two opposite ends, one end of which is connected to the first power supply (211) via a first wire (213), and the other end of which is arranged in the inner cavity (101) and spaced apart from the adjacent first electrodes (212) to form a discharge interval. Accordingly, of the two first electrodes (212), the one located upstream of the discharge interval is selected as a PN electrode.

3. The multifunctional gas detector according to claim 2, characterized in that: The first electrode (212) comprises an electrode body (201) and a conductive wire (202); the electrode body (201) is constructed in the shape of an axial rod and is passed through the detector body (100); the conductive wire (202) is passed through the electrode body (201); accordingly, one end of the conductive wire (202) is connected to the first wire (213), and the other end of the conductive wire (202) extends into the inner cavity (101) and forms a discharge junction; Correspondingly, in the PN electrode, a zirconium-platinum-silicon electrode (203) is provided on the electrode body (201), one end of the zirconium-platinum-silicon electrode (203) is connected to the first wire (213) via a conductive wire (202), and the other end of the zirconium-platinum-silicon electrode (203) is connected to the discharge junction.

4. The multifunctional gas detector according to claim 3, characterized in that: A magnetic attraction component is provided outside the detector body (100), and the magnetic attraction component attracts the conductive wire (202) through magnetic force to drive the first electrode (212) to move back and forth along the detector body (100).

5. The multifunctional gas detector according to claim 4, characterized in that: The magnetic attraction member is provided with two working ends, or the magnetic attraction member is provided with two ends, so as to respectively attract the two first electrodes (212) so as to make the two first electrodes (212) move synchronously or asynchronously.

6. The multifunctional gas detector according to any one of claims 1 to 5, characterized in that: The bias DC power supply (220) includes a second power supply (221) and a second electrode (222), wherein the second power supply (221) is a DC power supply (200); the second electrode (222) includes a ground electrode and two bias electrodes, and the three electrodes are all arranged on the detector body (100) and connected to the second power supply (221) via a second wire (223).

7. The multifunctional gas detector according to claim 6, characterized in that: When the multifunctional gas detector is used as a PDECD detector, the external output voltage of the second power supply (221) does not exceed 450V; when the multifunctional gas detector is used as a PDHID detector or a DID detector, the external output voltage of the second power supply (221) is 2000-4500V.

8. The multifunctional gas detector according to claim 7, characterized in that: An inner cavity (101) is provided in the detector body (100), and a sample gas inlet (102), a reference gas inlet (103), a nitrogen gas inlet (104), a signal outlet (105) and an air outlet (106) are provided on the detector body (100); The inner cavity (101) is sequentially divided into a discharge zone (107), an ionization zone (108), an ion collection zone (109) and a gas outlet zone (110). Correspondingly, the reference gas inlet (103) and the nitrogen gas inlet (104) are connected to the discharge zone (107), the sample gas inlet (102) is connected to the ionization zone (108), the signal outlet (105) is connected to the ion collection zone (109), and the gas outlet (106) is connected to the gas outlet zone (110) and the outside world. The sample gas inlet (102), the reference gas inlet (103), the nitrogen gas inlet (104), the signal outlet (105) and the gas outlet (106) are respectively provided with gas pipes; Correspondingly, the first electrode (212) is provided on the detector body (100) and extends to the discharge region (107), and the second electrode (222) is provided on the detector body (100) and extends to the ionization region (108).

9. The multifunctional gas detector according to claim 8, characterized in that: When the multifunctional gas detector is used as a PDECD detector, gas is introduced into the sample gas inlet (102), the reference gas inlet (103) and the nitrogen gas inlet (104); When the multifunctional gas detector is used as a PDHID detector or a DID detector, the sample gas inlet (102) normally introduces gas, the reference gas inlet (103) introduces gas as needed, and the nitrogen inlet (104) does not need to introduce nitrogen.

10. The multifunctional gas detector according to claim 9, characterized in that: The inner cavity (101) is constructed as a circular cavity or a cylindrical cavity; the width of the discharge zone (107) is adapted to the width of the inner cavity (101), the length is 1-100 mm, and the height is 0.5-100 mm; the width of the ionization zone (108) is adapted to the width of the inner cavity (101), the length is 1-100 mm, and the height is 0.5-100 mm.

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