Auxiliary cooling system for plasma mass spectrometer

Abstract

The utility model provides an auxiliary cooling system for a plasma mass spectrometer, which belongs to the technical field of inductively coupled plasma mass spectrometers and comprises a spiral cooling unit, the spiral cooling unit comprises a variable-diameter spiral cooling pipe, an outer frame body, a communicating pipe and an external circulating water supply part, the variable-diameter spiral cooling pipe is embedded in the outer wall of the sampling cone or / and the outer wall of the intercepting cone, the outer frame body is embedded in the inner wall of the ion circulation shell and is detachably connected with the variable-diameter spiral cooling pipe, one end of the communicating pipe is connected with the variable-diameter spiral cooling pipe in a sleeving manner, and the other end of the communicating pipe is detachably connected with the outer frame body. The external circulating water supply part is located on the outer side of the plasma mass spectrometer, and the other end of the communicating pipe penetrates through the ion circulation shell to be communicated with the external circulating water supply part. According to the auxiliary cooling system, the continuous cooling effect can be achieved through circulating flow of cooling liquid, and the cooling effect on key heat source areas (the sampling cone and the intercepting cone) is improved.

Description

Technical Field

[0001] This invention belongs to the field of inductively coupled plasma mass spectrometry (ICP-MS) technology, and specifically relates to an auxiliary cooling system for a plasma mass spectrometer. Background Technology

[0002] Inductively coupled plasma mass spectrometry (ICP-MS) is an analytical instrument that combines inductively coupled plasma (ICP) technology with mass spectrometry. As a high-precision trace analysis instrument, its core components generate a large amount of heat during operation. Insufficient heat dissipation can lead to performance degradation, poor stability, or even equipment damage. For example, if the sampling cone and the cutoff cone in the plasma interface region are in direct contact with high-temperature plasma (approximately 6000-10000K), heat accumulation can easily cause carbon buildup in the cone volume, ion recombination, and signal drift, affecting resolution and sensitivity.

[0003] To reduce the temperature of the plasma interface region, existing technologies include cooling auxiliary devices for the plasma interface region, such as the invention patent application CN202180076225.3, which discloses an air-cooled interface for an inductively coupled plasma mass spectrometer (ICP-MS). The interface structure is configured to rapidly transfer heat away from the front surface of the interface exposed to the high-temperature plasma, while retaining heat in the ion beam to prevent recombination and aggregation. The air-cooled interface of this system includes a set of fins for rapid heat transfer, which can be placed in various orientations along the side of the ICP-MS system. Open-cell metal foam is also used to improve heat transfer efficiency. The system can be cooled using one or more fans through natural convection or forced convection.

[0004] However, the air-cooled interface has a complex structure and does not cover the critical heat source areas (sampling cone and interception cone), resulting in low cooling efficiency. Utility Model Content

[0005] Based on this, the present invention provides an auxiliary cooling system for a plasma mass spectrometer to solve the technical problem that the existing air-cooled interface structure is complex and does not cover the key heat source areas (sampling cone and interception cone), resulting in low cooling efficiency.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] An auxiliary cooling system for a plasma mass spectrometer includes an ion flow housing, a sampling cone, and a snipping cone. The sampling cone and the snipping cone are coaxially arranged within the ion flow housing. The system includes a spiral cooling unit comprising a variable-diameter spiral cooling tube, an outer frame, a connecting pipe, and an external circulating water supply unit. The variable-diameter spiral cooling tube is nested within the outer wall of the sampling cone and / or the outer wall of the snipping cone. The outer frame is embedded within the inner wall of the ion flow housing and is detachably connected to the variable-diameter spiral cooling tube. One end of the connecting pipe is sleeved with the variable-diameter spiral cooling tube. The external circulating water supply unit is located outside the plasma mass spectrometer, and the other end of the connecting pipe passes through the ion flow housing and communicates with the external circulating water supply unit.

[0008] Preferably, the pipeline path of the variable diameter spiral cooling pipe is a conical spiral.

[0009] Preferably, the flow channel cross-section of the variable diameter spiral cooling pipe is elliptical.

[0010] Preferably, the outer frame is provided in two sets, with the two sets of outer frame bodies located on the liquid inlet side and the liquid outlet side of the variable diameter spiral cooling pipe, respectively.

[0011] Preferably, the outer frame includes an inner ring, an adjustable rod, and a fixing screw. The inner ring is sleeved on the inner wall of the ion flow housing. One end of the adjustable rod is connected to the inner ring, and the other end of the adjustable rod is connected to the variable diameter spiral cooling pipe. The fixing screw is disposed on the inner ring and passes through the inner ring to connect with the ion flow housing.

[0012] Preferably, the adjustable connecting rod includes a first connecting rod, a second connecting rod, and a spiral adjusting post. The first connecting rod is disposed on the inner connecting ring. One end of the second connecting rod is slidably sleeved inside the first connecting rod, and the other end of the second connecting rod is connected to the variable diameter spiral cooling pipe. The spiral adjusting post is disposed on the side wall of the first connecting rod, and one end of the spiral adjusting post passes through the side wall of the first connecting rod and abuts against the side wall of the second connecting rod.

[0013] Preferably, the connecting pipe includes a first flexible tube and a second flexible tube. The first flexible tube is provided with a first sleeve and a second sleeve. One end of the first flexible tube is connected to the liquid inlet end of the variable diameter spiral cooling tube through the first sleeve. The second sleeve is provided on the ion flow shell. The other end of the first flexible tube is connected to the second sleeve and passes through the second sleeve to connect to the external circulating water supply unit. The second flexible tube is provided with a third sleeve and a fourth sleeve. One end of the second flexible tube is connected to the liquid outlet end of the variable diameter spiral cooling tube through the third sleeve. The fourth sleeve is provided on the ion flow shell. The other end of the second flexible tube is connected to the fourth sleeve and passes through the fourth sleeve to connect to the external circulating water supply unit.

[0014] Preferably, the external circulating water supply unit includes a water tank and a circulating pump. The circulating pump is disposed inside the water tank. The first hose passes through the water tank and is connected to the circulating pump. The second hose is in communication with the water tank.

[0015] Preferably, the plasma mass spectrometer also includes an RF power supply PCB board and an RF power module cooling unit covering the surface of the RF power supply PCB board. The RF power module cooling unit includes several heat dissipation substrates, heat pipes, fins, and a centrifugal fan. The several heat dissipation substrates are evenly arranged along a preset spacing. The heat dissipation substrates are in contact with each other and are attached to the RF power supply PCB board. The heat pipes are disposed between adjacent heat dissipation substrates and are in contact with each other. The fins are located on one side of the heat dissipation substrates and are connected to the heat pipes. The centrifugal fan is disposed on the side close to the fins.

[0016] Preferably, the heat dissipation substrate is inclined, and the included angle between the heat dissipation substrate and the RF power PCB board is 15°-45°.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] This auxiliary cooling system has a simple structure and strong applicability. It can cool the key heat source areas (sampling cone and intercepting cone), and through the circulation of coolant, it can achieve a continuous cooling effect, improve the cooling effect on the key heat source areas (sampling cone and intercepting cone), thereby reducing carbon buildup, ion recombination and signal drift at the sampling cone and intercepting cone, and improving resolution and sensitivity. Attached Figure Description

[0019] Figure 1 This is an isometric view of the sampling cone and spiral cooling unit.

[0020] Figure 2 This is a front view of the sampling cone and spiral cooling unit.

[0021] Figure 3 Axonometric view of the sampling cone and ion flow shell.

[0022] Figure 4 This is an isometric view of the spiral cooling unit.

[0023] Figure 5 This is a top view of the spiral cooling unit.

[0024] Figure 6 This is a front view of the spiral cooling unit.

[0025] Figure 7 This is an isometric view of the RF power module cooling unit and the RF power PCB board.

[0026] Figure 8 Left view of the RF power module cooling unit and RF power PCB board.

[0027] Figure 9 This is a front view of the RF power module cooling unit and the RF power PCB board.

[0028] Figure 10 This is a schematic diagram of an auxiliary cooling system for a plasma mass spectrometer.

[0029] The diagram shows: a plasma mass spectrometer 100, an ion flow housing 110, a sampling cone 120, an RF power supply PCB board 130, a spiral cooling unit 200, a variable diameter spiral cooling tube 210, an outer frame 220, an inner connecting ring 221, an adjustable connecting rod 222, a first connecting rod 2221, a second connecting rod 2222, a spiral adjusting column 2223, a fixing screw 223, a connecting pipe 230, a first flexible hose 231, a first sleeve 2311, a second sleeve 2312, a second flexible hose 232, a third sleeve 2321, a fourth sleeve 2322, an external circulating water supply unit 240, a water tank 241, a circulating pump 242, an RF power supply module cooling unit 300, a heat dissipation substrate 310, a heat pipe 320, fins 330, and a centrifugal fan 340. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0031] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0032] The plasma mass spectrometer 100, abbreviated as ICP-MS, is basically composed of a sample introduction system, nebulizer, ion source, plasma interface, ion focusing system, quadrupole mass filter, ion detector and other components.

[0033] The plasma interface is the most critical part of the entire ICP-MS system, its function being to effectively transfer ions from the plasma to the mass spectrometer. It contains an ion flow housing 110, a sampling cone 120, and a snipping cone. The sampling cone 120 and the snipping cone are coaxially arranged within the ion flow housing 110. The sampling cone 120 draws most of the carrier gas flow, i.e., the ion flow, from the plasma central channel into the cone orifice, into the first-stage vacuum chamber. The snipping cone selects the central portion of the expanding jet from the sampling cone 120 orifice and directs it through the snipping cone into the next stage of vacuum.

[0034] Specifically, the sampling cone 120 is fixed inside the ion flow housing 110 by a hollow ring, and the intercepting cone is fixed inside the ion flow housing 110 by a hollow ring.

[0035] An auxiliary cooling system for an intracranial plasma mass spectrometer 100 (ICP-MS) includes a spiral cooling unit 200, which is used to cool the outer surface temperature of the sampling cone 120 and / or the outer surface temperature of the truncating cone; the spiral cooling unit 200 includes a variable diameter spiral cooling tube 210, an outer frame 220, a connecting pipe 230, and an external circulating water supply unit 240.

[0036] The variable diameter spiral cooling pipe 210 is nested on the outer wall of the sampling cone 120 and / or the outer wall of the cutting cone, and the variable diameter spiral cooling pipe 210 is attached to the outer wall of the sampling cone 120 and / or the outer wall of the cutting cone. The variable diameter spiral cooling pipe 210 is made of a fast heat-conducting material. Cooling liquid flows inside the variable diameter spiral cooling pipe 210. The heat from the outer surface of the sampling cone 120 and the cutting cone is transferred to the variable diameter spiral cooling pipe 210, and the heat from the variable diameter spiral cooling pipe 210 is cooled by the cooling liquid.

[0037] To facilitate fixing the variable-diameter spiral cooling tube 210 to the outer wall of the sampling cone 120 and / or the outer wall of the cutting cone, the outer frame 220 is embedded in the inner wall of the ion flow housing 110. The outer frame 220 and the ion flow housing 110 are detachably or fixedly connected. The detachable connection can be achieved by using screws and screw holes, or the fixed connection can be achieved by welding or integral casting. At the same time, the outer frame 220 is detachably connected to the variable-diameter spiral cooling tube 210, and the variable-diameter spiral cooling tube 210 is nested in the outer wall of the sampling cone 120 and / or the outer wall of the cutting cone, and the variable-diameter spiral cooling tube 210 is coaxially arranged with the sampling cone 120.

[0038] One end of the connecting pipe 230 is sleeved with the variable-diameter spiral cooling pipe 210. The external circulating water supply unit 240 is located outside the plasma mass spectrometer 100. The other end of the connecting pipe 230 passes through the ion flow housing 110 and communicates with the external circulating water supply unit 240. The external circulating water supply unit 240 contains coolant, specifically, the coolant can be cooling water or a liquid with a cooling effect. The coolant needs to be replaced or a coolant added periodically to maintain its cooling effect. Specifically, the connecting pipe 230 can be a flexible hose.

[0039] The auxiliary cooling system provided in this application utilizes the external circulating water supply unit 240 to provide coolant. The coolant is introduced into the connecting pipe 230 at a preset flow rate. The coolant enters the inlet of the variable diameter spiral cooling pipe 210 through the connecting pipe 230, carrying away the heat from the variable diameter spiral cooling pipe 210. Through the principle of heat transfer, the heat of the sampling cone 120 and the intercepting cone is reduced. The coolant then flows back from the outlet of the variable diameter spiral cooling pipe 210 through the connecting pipe 230 to the external circulating water supply unit 240, achieving heat exchange. This auxiliary cooling system has a simple structure and strong applicability. It can cool the key heat source areas (sampling cone 120 and intercepting cone), and through the circulating flow of coolant, it can achieve a continuous cooling effect, improving the cooling effect on the key heat source areas (sampling cone 120 and intercepting cone), thereby reducing carbon buildup, ion recombination, and signal drift at the sampling cone 120 and intercepting cone, and improving resolution and sensitivity.

[0040] In a preferred embodiment, the pipeline path of the variable diameter spiral cooling pipe 210 is a conical spiral. Based on the conical spiral pipeline paths of the sampling cone 120 and the snipping cone, the variable diameter spiral cooling pipe 210 is designed to be compatible with either the sampling cone 120 or the snipping cone, allowing for better contact with the outer walls of the sampling cone 120 and the snipping cone, thereby improving the cooling effect.

[0041] In a preferred embodiment, the flow channel cross-section of the variable diameter spiral cooling pipe 210 is elliptical. This increases the contact area between the variable diameter spiral cooling pipe 210 and the sampling cone 120 and the cutting cone, thereby further improving the cooling effect.

[0042] It should be emphasized that two sets of outer frame bodies 220 are provided, with the two sets of outer frame bodies 220 located on the liquid inlet side and the liquid outlet side of the variable diameter spiral cooling tube 210, respectively. By providing two sets of outer frame bodies 220, the outer frame bodies 220 can be stably fixed within the ion flow housing 110, and the outer frame bodies 220 can maintain the variable diameter spiral cooling tube 210 in a fixed state, so that the variable diameter spiral cooling tube 210 can be relatively fixed and in close contact with the sampling cone 120 or the cutting cone, thereby achieving cooling of the sampling cone 120 and the cutting cone.

[0043] In a preferred embodiment, to ensure that the variable-diameter spiral cooling tube 210 fits snugly against the sampling cone 120 or the cutting cone and is located on the same axis, the outer frame 220 includes an inner ring 221, an adjustable connecting rod 222, and a fixing screw 223. The inner ring 221 is sleeved on the inner wall of the ion flow housing 110, and the axis of the inner ring 221 coincides with the axis of the ion flow housing 110. One end of the adjustable connecting rod 222 is connected to the inner ring 221, and the other end of the adjustable connecting rod 222 is connected to the variable-diameter spiral cooling tube 210. The fixing screw 223 is disposed on the inner ring 221, and the fixing screw 223 passes through the inner ring 221 and is connected to the ion flow housing 110. Furthermore, for a more detailed description, taking the adjustable connecting rod 222 vertically downward as an example, two sets of inner connecting rings 221 are fitted inside the ion flow housing 110, and the inner connecting rings 221 are connected to the ion flow housing 110 by the fixing screws 223. Specifically, both the inner connecting rings 221 and the ion flow housing 110 have threaded holes, and the fixing screws 223 are fixed by passing through the threaded holes; then, the variable diameter spiral cooling tube 210 is pre-fitted and nested on the outer wall of the sampling cone 120, and one end of the adjustable connecting rod 222 is installed on the inner connecting ring. 221 is fixed in place, with one end of the adjustable connecting rod 222 snapped onto the variable diameter spiral cooling tube 210. The two adjustable connecting rods 222 are located on the liquid inlet pipe side and the liquid outlet pipe side of the variable diameter spiral cooling tube 210, respectively. By finely adjusting the two adjustable connecting rods 222 to extend and retract vertically, each spiral of the variable diameter spiral cooling tube 210 is made to fit against the variable diameter spiral cooling tube 210. When the adjustment of the adjustable connecting rods 222 is stopped and fixed, the nesting of the variable diameter spiral cooling tube 210 is completed, which facilitates subsequent cooling and heat exchange.

[0044] As further detailed, to facilitate adjustment of the adjustable connecting rod 222, the adjustable connecting rod 222 includes a first connecting rod 2221, a second connecting rod 2222, and a spiral adjusting column 2223. The first connecting rod 2221 is disposed on the inner connecting ring 221. One end of the second connecting rod 2222 is slidably sleeved inside the first connecting rod 2221, and the other end of the second connecting rod 2222 is connected to the variable diameter spiral cooling pipe 210. The spiral adjusting column 2223 is disposed on the side wall of the first connecting rod 2221, and one end of the spiral adjusting column passes through the side wall of the first connecting rod 2221 and abuts against the side wall of the second connecting rod 2222. By reversing the spiral adjusting rod, the spiral adjusting rod is in a relaxed state, allowing the second connecting rod 2222 to slide within the first connecting rod 2221. Fine-tuning the sliding of the second connecting rod 2222 within the first connecting rod 2221 causes the variable diameter spiral cooling tube 210 to come into contact with the outer surface of the sampling cone 120. When in contact, rotating the spiral adjusting rod clockwise causes the front end of the spiral adjusting rod to pass through the side wall of the first connecting rod 2221 and press against the side wall of the second connecting rod 2222. Continuing to rotate the spiral adjusting rod causes the front end of the spiral adjusting rod to press against the second connecting rod 2222, making the second connecting rod 2222 and the first connecting rod 2221 in close contact and relatively fixed.

[0045] Specifically, one end of the first connecting rod 2221 is a threaded post, and the inner connecting ring 221 has a threaded hole. The threaded end of the first connecting rod 2221 can be screwed into the threaded hole. One end of the second connecting rod 2222 has a clamp, which can be fixed on the variable diameter spiral cooling pipe 210.

[0046] In a preferred embodiment, the connecting pipe 230 includes a first flexible tube 231 and a second flexible tube 232. The first flexible tube 231 is provided with a first sleeve 2311 and a second sleeve 2312. One end of the first flexible tube 231 is connected to the liquid inlet end of the variable diameter spiral cooling pipe 210 through the first sleeve 2311. The second sleeve 2312 is disposed on the ion flow housing 110. The other end of the first flexible tube 231 is connected to and passes through the second sleeve 2312. 312 is connected to the external circulating water supply unit 240. The second hose 232 is provided with a third sleeve 2321 and a fourth sleeve 2322. One end of the second hose 232 is connected to the liquid outlet end of the variable diameter spiral cooling pipe 210 through the third sleeve 2321. The fourth sleeve 2322 is disposed on the ion flow housing 110. The other end of the second hose 232 is connected to the fourth sleeve 2322 and passes through the fourth sleeve 2322 to connect to the external circulating water supply unit 240. The first sleeve 2311 mainly serves to connect and seal the first hose 231 to the variable diameter spiral cooling pipe 210. The second sleeve 2312 mainly serves as a bridging connection. The second sleeve 2312 passes through both the ion flow housing 110 and the plasma mass spectrometer. The first flexible tube 231 and the second flexible tube 232 each have two sections, one located inside the ion flow housing 110 and the other located outside the plasma mass spectrometer 100. The first flexible tube 231 and the second flexible tube 232 located inside the ion flow housing 110 are connected to and sealed with one end of the second sleeve 2312 to prevent leakage. The first flexible tube 231 and the second flexible tube 232 located outside the plasma mass spectrometer 100 are connected to and sealed with the other end of the second sleeve 2312 to prevent leakage.

[0047] In a preferred embodiment, the external circulating water supply unit 240 includes a water tank 241 and a circulating pump 242. The circulating pump 242 is disposed inside the water tank 241. A first hose 231 passes through the water tank 241 and is connected to the circulating pump 242. A second hose 232 communicates with the water tank 241. The circulating pump 242 starts and draws coolant from the water tank 241 into the first hose. The returning coolant flows back to the water tank 241 through the second hose 232.

[0048] In some embodiments, the plasma mass spectrometer 100 also includes an RF power supply PCB board 130. The RF power supply has high power (typically 1.5-2kW), and the RF power supply PCB board 130 generates a large amount of heat during prolonged operation, making it a critical heat source area for the plasma mass spectrometer 100. To reduce the temperature of the RF power supply PCB board 130, an RF power module cooling unit 300 is also included, covering the surface of the RF power supply PCB board 130 to dissipate heat.

[0049] In one possible embodiment, since the RF power PCB board 130 is not suitable for water cooling, the RF power module cooling unit 300 includes several heat dissipation substrates 310, heat pipes 320, fins 330, and a centrifugal fan 340. The several heat dissipation substrates 310 are evenly arranged along a preset spacing, and the heat dissipation substrates 310 are in contact with the RF power PCB board 130. The several heat dissipation substrates 310 can quickly transfer the heat from the RF power PCB board 130 and are easy to install on the surface of the RF power PCB board 130. The heat pipe 320 is disposed between adjacent heat dissipation substrates 310 and is in contact with the heat dissipation substrates 310. The heat pipe 320 can quickly conduct heat from one end of the heat dissipation substrate 310 to the other end. The fins 330 are located on one side of the heat dissipation substrate 310, and the heat pipe 320 is connected to the fins 330. Several fins 330 are evenly arranged, and their main function is heat dissipation. The centrifugal fan 340 is disposed near the fins 330. This air-cooling method can quickly dissipate heat from the RF power PCB board 130, achieving cooling of the RF power PCB board 130 and preventing poor stability of the RF power supply on the RF power PCB board 130 due to high temperatures.

[0050] In a preferred embodiment, the heat dissipation substrate 310 is inclined, and the angle between the heat dissipation substrate 310 and the RF power PCB board 130 is 15°-45°. When the heat dissipation substrates 310 are arranged at an angle of 15°-45°, a stepped flow channel can be formed, which forces the airflow to generate a turbulent effect (Reynolds number Re > 2300) in the substrate gap. Compared with the laminar flow of parallel plates (Re < 2000), the convective heat transfer coefficient under turbulent conditions is increased by 3-5 times, which significantly reduces the surface temperature of the RF power PCB board 130.

[0051] Specifically, the angle between the heat dissipation substrate 310 and the RF power PCB board 130 is 30°, and the surface temperature of the RF power PCB board 130 is about 20% lower than that of the heat dissipation substrate 310.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An auxiliary cooling system for a plasma mass spectrometer, the plasma mass spectrometer is provided with an ion flow through housing, a sampling cone and a skimmer cone, the sampling cone and the skimmer cone are coaxially arranged in the ion flow through housing in sequence, characterized in that, The application relates to a spiral cooling unit for an inductively coupled plasma mass spectrometer. The spiral cooling unit comprises a variable-diameter spiral cooling pipe, an outer frame body, a connecting pipe and an external circulating water supply part, the variable-diameter spiral cooling pipe is arranged in a nested mode on the outer wall of a sampling cone and / or the outer wall of a cutting cone, the outer frame body is arranged in an embedded mode on the inner wall of the ion flow passing shell, the outer frame body is detachably connected with the variable-diameter spiral cooling pipe, one end of the connecting pipe is sleeved with the variable-diameter spiral cooling pipe, and the external circulating water supply part is located outside the inductively coupled plasma mass spectrometer, and the other end of the connecting pipe passes through the ion flow passing shell and is connected with the external circulating water supply part.

2. An auxiliary cooling system for a plasma mass spectrometer as defined in claim 1, wherein, The pipeline path of the variable-diameter spiral cooling pipe is a conical spiral line.

3. An auxiliary cooling system for a plasma mass spectrometer as defined in claim 2, wherein, The flow passage cross section of the variable-diameter spiral cooling pipe is in an elliptical shape.

4. An auxiliary cooling system for a plasma mass spectrometer as defined in claim 1, wherein, The outer frame body is provided with two groups, and the two groups of outer frame bodies are respectively located on the liquid inlet end side of the variable-diameter spiral cooling pipe and the liquid outlet end side of the variable-diameter spiral cooling pipe.

5. An auxiliary cooling system for a plasma mass spectrometer as defined in claim 4, wherein, The outer frame body comprises an inner ring, an adjustable connecting rod and a fixing screw, the inner ring is sleeved on the inner wall of the ion flow passing shell, one end of the adjustable connecting rod is connected with the inner ring, the other end of the adjustable connecting rod is connected with the variable-diameter spiral cooling pipe, and the fixing screw is arranged on the inner ring and connected with the ion flow passing shell through the inner ring.

6. An auxiliary cooling system for a plasma mass spectrometer as defined in claim 5, wherein, The adjustable connecting rod comprises a first connecting rod, a second connecting rod and a spiral adjusting column, the first connecting rod is arranged on the inner ring, one end of the second connecting rod is sleeved in the first connecting rod in a slidable mode, the other end of the second connecting rod is connected with the variable-diameter spiral cooling pipe, and the spiral adjusting column is arranged on the side wall of the first connecting rod and penetrates through the side wall of the first connecting rod and abuts against the side wall of the second connecting rod.

7. An auxiliary cooling system for a plasma mass spectrometer as defined in claim 1, wherein, The connecting pipe comprises a first hose and a second hose, the first hose is provided with a first sleeve and a second sleeve, one end of the first hose is connected with the liquid inlet end of the variable-diameter spiral cooling pipe through the first sleeve, the second sleeve is arranged on the ion flow passing shell, the other end of the first hose is connected with the second sleeve and connected with the external circulating water supply part through the second sleeve, the second hose is provided with a third sleeve and a fourth sleeve, one end of the second hose is connected with the liquid outlet end of the variable-diameter spiral cooling pipe through the third sleeve, the fourth sleeve is arranged on the ion flow passing shell, the other end of the second hose is connected with the fourth sleeve and connected with the external circulating water supply part through the fourth sleeve.

8. An auxiliary cooling system for a plasma mass spectrometer as defined in claim 7, wherein, The external circulating water supply part comprises a water tank and a circulating pump, the circulating pump is arranged in the water tank, the first hose is connected with the circulating pump through the water tank, and the second hose is connected with the water tank.

9. The auxiliary cooling system for a plasma mass spectrometer of claim 1, wherein the plasma mass spectrometer is further provided with an RF power supply PCB board, and the auxiliary cooling system is characterized in that, The application also comprises a radio frequency power module cooling unit covering the surface of the RF power PCB board, which comprises several pieces of heat dissipation base plate, heat pipe, fin and centrifugal fan, the several pieces of heat dissipation base plate are arranged uniformly along the preset interval, the heat dissipation base plate and the RF power PCB board are mutually adhered, the heat pipe is arranged between the adjacent heat dissipation base plates and the heat pipe and the heat dissipation base plate are mutually contacted, the fin is located on one side of the heat dissipation base plate, the heat pipe and the fin are connected, and the centrifugal fan is arranged on the side close to the fin.

10. An auxiliary cooling system for a plasma mass spectrometer as defined in claim 9, wherein, The heat dissipation base plate is arranged obliquely, and the included angle between the heat dissipation base plate and the RF power PCB board is 15°-45°.

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