A sampling harrow combining independent sampling and mixed sampling

Abstract

The application relates to the technical field of gas turbine measurement and analysis, and particularly relates to a sampling harrow combining independent sampling and mixed sampling, which comprises the following: sampling holes are communicated with air guide holes through inner tubes; a switching body is provided with a slide; a sliding block is slidably connected in the slide; a plurality of independent sampling channels and a single mixed sampling channel are arranged in the sliding block; a plurality of independent sampling tubes and a mixed sampling tube are arranged on the sliding block; the plurality of independent sampling tubes are respectively and correspondingly communicated with the plurality of independent sampling channels, and the mixed sampling tube is communicated with the mixed sampling channel; when the independent sampling is carried out, the sliding block slides to one end, and the plurality of independent sampling channels are respectively communicated with the plurality of air guide holes; when the mixed sampling is carried out, the sliding block slides to the other end, and the mixed sampling channel is communicated with the plurality of air guide holes; the independent sampling state and the mixed sampling state are switched through the sliding of the sliding block; the combustion chamber pollutant emission level, the combustion efficiency and the gas temperature and the like are obtained in a single experiment, the data accuracy is improved, the cost is reduced, and the experiment progress is accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine measurement and analysis, and in particular to a sampling rake combining independent sampling and mixed sampling. Background Art

[0002] With the continuous development of gas turbine technology, its performance requirements are also constantly increasing; higher combustion efficiency, lower pollutant emission levels, more stable combustion state and more reasonable outlet temperature distribution have become the main technical indicators for the design and development of advanced gas turbine combustors.

[0003] As a commonly used experimental method in combustion chamber experimental research, the gas analysis and measurement system can accurately measure the gas composition and concentration at the combustion chamber outlet to evaluate and estimate the pollutant emission level of the combustion chamber (pollutants include: NO X In order to measure the gas composition and concentration at the combustion chamber outlet, it is necessary to arrange a reasonable sampling rake near the combustion chamber outlet to meet the actual measurement needs.

[0004] Current sampling methods are mainly divided into two types: independent sampling and mixed sampling. The purpose of independent sampling is to obtain gas from different locations at the combustion chamber outlet, and to infer the gas temperature at the corresponding location by measuring the combustion composition and concentration, thereby obtaining the quality of the combustion chamber outlet temperature distribution. The purpose of mixed sampling is to obtain uniform gas at the combustion chamber outlet, and to evaluate and infer the pollutant emission level and combustion efficiency of the combustion chamber by measuring the combustion composition and concentration of the uniform gas.

[0005] Existing sampling rakes can only perform one of the sampling methods: independent sampling or mixed sampling. Sampling rakes with a single sampling method cannot obtain performance data such as pollutant emission levels, combustion efficiency, and gas temperature in a single combustion chamber experiment, thereby affecting the experimental cost and experimental progress. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the sampling rake cannot obtain performance data such as pollutant emission level, combustion efficiency and gas temperature in a single combustion chamber experiment, thereby affecting the experimental cost and experimental progress.

[0007] In order to overcome the above-mentioned drawbacks, the present invention provides a sampling rake combining independent sampling and mixed sampling, comprising:

[0008] The shell is provided with a plurality of sampling holes and a plurality of air bleed holes; a plurality of inner tubes corresponding to the plurality of sampling holes are provided inside the shell, the inlets of the inner tubes are connected to the sampling holes, the sampling holes are suitable for obtaining the gas in the combustion chamber; the outlets of the inner tubes are connected to the air bleed holes;

[0009] A switching body is connected to the housing, and a slide is provided inside the switching body; a slider is slidably connected to the slide; a plurality of independent sampling channels and a single mixed sampling channel are provided inside the slider, which are isolated from each other; a plurality of independent sampling tubes and a mixed sampling tube are provided on the slider; the plurality of independent sampling tubes are respectively connected to the plurality of independent sampling channels in a one-to-one correspondence, and the mixed sampling tube is connected to the mixed sampling channel; the plurality of independent sampling channels are provided in a one-to-one correspondence with the plurality of air inlet holes;

[0010] The sampling rake combining independent sampling and mixed sampling has an independent sampling state in which multiple independent sampling channels are respectively connected to multiple air holes when the slider slides to one end; and has a mixed sampling state in which the mixed sampling channel is connected to multiple air holes when the slider slides to the other end.

[0011] Optionally, in the slideway, the space outside the side wall of one end of the slider forms a first cavity; in the slideway, the space outside the side wall of the other end of the slider forms a second cavity;

[0012] A first limiting platform is provided in the first cavity, and a second limiting platform is provided in the second cavity;

[0013] When the first limit platform is adapted to contact the slider, the sampling rake combining independent sampling and mixed sampling is in an independent sampling state; when the second limit platform is adapted to contact the slider, the sampling rake combining independent sampling and mixed sampling is in a mixed sampling state.

[0014] Optionally, a first air inlet pipe is connected to the first cavity, and a second air inlet pipe is connected to the second cavity;

[0015] The second air inlet pipe is adapted to push the slider to slide toward one end when ventilating the second cavity;

[0016] The first air inlet pipe is adapted to push the slider to slide toward the other end when ventilating the first cavity.

[0017] Optionally, a first elastic member is provided between the side wall at one end of the slider and the opposite side wall in the slideway; and a second elastic member is provided between the side wall at the other end of the slider and the opposite side wall in the slideway.

[0018] Optionally, the first elastic member and the second elastic member are suitable for resetting the slider to a non-sampling state; in the non-sampling state, the air duct hole is disconnected from both the independent sampling channel and the mixed sampling channel.

[0019] Optionally, an outer wall surface of the shell where the sampling hole is located is provided with a curved surface.

[0020] Optionally, a labyrinth cooling channel is formed in the shell by a plurality of guide plates, and the labyrinth cooling channel is in a "J"-shaped circulation form.

[0021] Optionally, a water inlet pipe and a water outlet pipe are connected to both ends of the labyrinth cooling channel; the front section of the labyrinth cooling channel connected to the water inlet pipe is arranged close to one side of the shell where the sampling hole is located; the rear section of the labyrinth cooling channel connected to the water outlet pipe is arranged away from the other side of the shell where the sampling hole is located.

[0022] Optionally, the guide plate is integrated with the inner tube.

[0023] Optionally, a flange is provided on the housing.

[0024] The above technical solution of the present invention has the following advantages over the prior art:

[0025] 1. The sampling rake combining independent sampling and mixed sampling provided by the present invention comprises: a shell body provided with a plurality of sampling holes and a plurality of air bleed holes; a plurality of inner tubes corresponding to the plurality of sampling holes are provided inside the shell body, the inlets of the inner tubes are connected to the sampling holes, and the sampling holes are suitable for obtaining the gas in the combustion chamber; the outlets of the inner tubes are connected to the air bleed holes; a switching body connected to the shell body, a slide is provided inside the switching body; a slider is slidably connected to the slide; a plurality of independent sampling channels and a single mixed sampling channel isolated from each other are provided inside the slider; a plurality of independent sampling tubes and a mixed sampling tube are provided on the slider; the plurality of independent sampling tubes are connected to the plurality of independent sampling channels in a one-to-one correspondence, and the mixed sampling The tube is connected to the mixed sampling channel; multiple independent sampling channels are arranged in a one-to-one correspondence with multiple air bleed holes; the sampling rake combining independent sampling and mixed sampling has an independent sampling state in which multiple independent sampling channels are connected to multiple air bleed holes respectively when the slider slides to one end; and a mixed sampling state in which the mixed sampling channel is connected to multiple air bleed holes when the slider slides to the other end; the present application adopts the above technical solution, and facilitates switching between the independent sampling state and the mixed sampling state by sliding the slider; and can obtain performance data such as the pollutant emission level, combustion efficiency and gas temperature of the gas turbine combustion chamber in a single combustion chamber experiment, thereby improving the accuracy of the experimental data, reducing the experimental cost, shortening the experimental cycle and accelerating the experimental progress. At the same time, it avoids obtaining the above performance data in two experiments, and cannot guarantee the consistency of the experimental state, thereby affecting the test accuracy.

[0026] 2. In the slide of the present invention, the space outside the side wall of one end of the slider forms a first cavity; in the slide, the space outside the side wall of the other end of the slider forms a second cavity; a first limit platform is provided in the first cavity, and a second limit platform is provided in the second cavity; when the first limit platform is suitable for contacting the slider, the sampling rake combining independent sampling and mixed sampling is in an independent sampling state; when the second limit platform is suitable for contacting the slider, the sampling rake combining independent sampling and mixed sampling is in a mixed sampling state; the present application adopts the above technical solution, and by setting the first limit platform and the second limit platform, ensures that the slider moves into position, and ensures that the independent sampling state and the mixed sampling state are accurately in place when they are connected.

[0027] 3. The present invention is provided with a first air inlet pipe connected to the first cavity, and a second air inlet pipe is provided to the second cavity; the second air inlet pipe is suitable for pushing the slider to slide toward one end when air is ventilated to the second cavity; the first air inlet pipe is suitable for pushing the slider to slide toward the other end when air is ventilated to the first cavity; the present application adopts the above technical solution to realize the sliding of the slider through pneumatic control, thereby being able to realize switching between independent sampling or mixed sampling on the same sampling rake that combines independent sampling and mixed sampling.

[0028] 4. The present invention provides a first elastic member between the side wall of one end of the slider and the opposite side wall in the slide; a second elastic member is provided between the side wall of the other end of the slider and the opposite side wall in the slide; the present application adopts the above technical solution, and when the first air intake pipe and the second air intake pipe are in a non-ventilation state, the slider quickly returns to its initial state.

[0029] 5. The first elastic member and the second elastic member of the present invention are suitable for resetting the slider to a non-sampling state; in the non-sampling state, the air duct hole is disconnected from the independent sampling channel and the mixed sampling channel; the present application adopts the above technical solution, and through the cooperation of the first elastic member and the second elastic member, the slider is in a force-balanced position, so that in the non-sampling state, the sampling channel (that is, the passage from the sampling hole to the mixed sampling tube or the independent sampling tube) is stably disconnected.

[0030] 6. In the present invention, the outer wall surface of the shell where the sampling hole is located is provided with a curved surface; this application adopts the above technical solution to reduce the impact on the gas flow field at the sampling hole.

[0031] 7. The present invention forms a labyrinth cooling channel in the shell through multiple guide plates, and the labyrinth cooling channel is in a "J"-shaped circulation form; the present application adopts the above technical solution and adopts a labyrinth cooling channel in a "J"-shaped circulation form to improve the heat exchange efficiency; the temperature of the shell and the inner tube is reduced, the thermal stress is reduced, and the service life of the sampling rake combined with independent sampling and mixed sampling is effectively extended, and the sampling rake combined with independent sampling and mixed sampling is protected from being ablated by high-temperature fuel gas, and the high-temperature fuel gas in the inner tube can be quickly cooled, effectively freezing the chemical reaction in the fuel gas, thereby improving the measurement accuracy.

[0032] 8. The two ends of the labyrinth cooling channel described in the present invention are connected with a water inlet pipe and a water outlet pipe; the front section of the labyrinth cooling channel connected to the water inlet pipe is arranged close to the side of the shell where the sampling hole is located; the rear section of the labyrinth cooling channel connected to the water outlet pipe is arranged away from the other side of the shell where the sampling hole is located; the present application adopts the above technical solution, first using the lower temperature inlet water to cool the side of the shell facing the combustion chamber with a relatively high temperature, and then using the cold water with a slightly increased temperature after circulation to cool the other side of the shell facing away from the combustion chamber with a relatively low temperature; according to the uneven temperature distribution of the shell, the cooling characteristics of the circulating water are used to reasonably arrange the balanced temperature, so that the temperature distribution of the shell is more uniform and the thermal stress is smaller, which can effectively extend the service life of the sampling rake combined with independent sampling and mixed sampling, protect the sampling rake combined with independent sampling and mixed sampling from being ablated by high-temperature fuel gas, and can quickly cool the high-temperature fuel gas in the inner tube, effectively freezing the chemical reaction in the fuel gas, thereby improving the measurement accuracy.

[0033] 9. The guide plate described in the present invention is arranged integrally with the inner tube; the present application adopts the above technical solution to avoid the processing and welding difficulties caused by the interlaced arrangement of the inner tube and the guide plate in the prior art, making the arrangement of the labyrinth cooling channel simpler and clearer, and the guide plate acts as a reinforcing rib for the inner tube, which can significantly enhance the overall strength of the guide plate and the inner tube; thereby extending the service life of the sampling rake that combines independent sampling and mixed sampling.

[0034] 10. The present invention is provided with a flange on the shell; the present application adopts the above technical solution to facilitate fixing the sampling rake combining independent sampling and mixed sampling on the combustion chamber, adjusting the installation angle, ensuring that the sampling hole is facing the flow direction of the high-temperature mainstream gas in the combustion chamber, and the gas enters the inner tube through multiple sampling holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 Schematic diagram of the three-dimensional structure of a sampling rake combining independent sampling and mixed sampling provided in an embodiment of the present invention;

[0037] Figure 2 A schematic cross-sectional view of a switching mechanism provided in an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of a partial cross-sectional structure of a sampling rake combining independent sampling and mixed sampling in an independent sampling state provided in an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of a partial cross-sectional structure of a sampling rake combining independent sampling and mixed sampling in a mixed sampling state provided in an embodiment of the present invention;

[0040] Figure 5 A schematic cross-sectional view of a labyrinth cooling channel provided in an embodiment of the present invention;

[0041] Figure 6 Schematic diagram of the integrated structure of the inner tube and the guide plate provided in an embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 1. Shell; 2. Sampling hole; 3. Flange; 4. Water inlet pipe; 5. Water outlet pipe; 6. Switching mechanism; 7. Switching body; 8. Slider; 9. Mixed sampling tube; 10. Independent sampling tube; 11. First air inlet pipe; 12. Second air inlet pipe; 13. Inner tube; 14. Guide plate; 15. First elastic member; 16. Second elastic member; 17. First limit platform; 18. Second limit platform; 19. First cavity; 20. Second cavity; 21. Air inlet hole; 22. Independent sampling channel; 23. Mixed sampling channel. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] like Figures 1 to 6 A specific embodiment of the sampling rake combining independent sampling and mixed sampling shown includes: a housing 1 and a switching body 7 that are connected.

[0049] like Figure 1 and Figure 2 As shown, the housing 1 is L-shaped and is equipped with five sampling holes 2 and five air bleed holes 21. Five parallel inner tubes 13 are arranged inside the housing 1. The inner tubes 13 are L-shaped, corresponding to the housing 1, and are arranged corresponding to the sampling holes 2. The inlets of the inner tubes 13 are connected to the sampling holes 2, which are suitable for collecting gas from the combustion chamber. The sampling holes 2 are located at the top of the horizontal portion of the L-shaped housing 1, and the five sampling holes 2 are arranged vertically. The outlets of the inner tubes 13 are connected to the air bleed holes 21, which are located at the top of the vertical portion of the L-shaped housing 1. The switching body 7 is a rectangular parallelepiped, and a horizontal slide is provided inside the switching body 7; a slider 8 is slidably connected in the slide; five independent sampling channels 22 and a single mixed sampling channel 23 that are isolated from each other are provided inside the slider 8; five independent sampling tubes 10 and one mixed sampling tube 9 are provided on the slider 8; the five independent sampling tubes 10 are respectively connected to the five independent sampling channels 22 in a one-to-one correspondence, and the mixed sampling tube 9 is connected to the mixed sampling channel 23; the five independent sampling channels 22 are arranged in a one-to-one correspondence with the five air ducts 21.

[0050] like Figures 2 to 4 As shown, the sampling rake combining independent sampling and mixed sampling has an independent sampling state in which the five independent sampling channels 22 are connected to the five air ducting holes 21 respectively when the slider 8 slides to the left end; and a mixed sampling state in which the mixed sampling channel 23 is connected to the five air ducting holes 21 when the slider 8 slides to the right end. In the slide, the space outside the left side wall of the slider 8 forms a first cavity 19; in the slide, the space outside the right side wall of the slider 8 forms a second cavity 20. A first limit platform 17 is provided in the first cavity 19, and a second limit platform 18 is provided in the second cavity 20. When the first limit platform 17 is adapted to contact the slider 8, the sampling rake combining independent sampling and mixed sampling is in the independent sampling state; when the second limit platform 18 is adapted to contact the slider 8, the sampling rake combining independent sampling and mixed sampling is in the mixed sampling state. A first air inlet pipe 11 is connected to the first cavity 19, and a second air inlet pipe 12 is connected to the second cavity 20. The second air inlet pipe 12 is adapted to push the slider 8 to the left when air is supplied to the second cavity 20, while the first air inlet pipe 11 is adapted to push the slider 8 to the right when air is supplied to the first cavity 19. Furthermore, a first elastic member 15 is provided between the left sidewall of the slider 8 and the opposing sidewall within the slideway, and a second elastic member 16 is provided between the right sidewall of the slider 8 and the opposing sidewall within the slideway. Specifically, both the first elastic member 15 and the second elastic member 16 are springs. These first and second elastic members 15, 16 are adapted to reset the slider 8 to a non-sampling state. In this non-sampling state, the air inlet 21 is disconnected from both the independent sampling channel 22 and the mixed sampling channel 23. The switching body 7, the slider 8, the first air inlet pipe 11, the second air inlet pipe 12, the first elastic member 15, and the second elastic member 16 constitute the switching mechanism 6.

[0051] like Figure 1 As shown, the left outer wall surface of the housing 1 where the sampling hole 2 is located is provided with an arc surface, specifically, the arc surface is a circular arc surface; a flange 3 is provided on the housing 1.

[0052] like Figure 5 and Figure 6As shown, a labyrinth cooling channel is formed in the shell 1 by five guide plates 14, and the labyrinth cooling channel is in a "J"-shaped circulation form. The guide plate 14 is L-shaped corresponding to the inner tube 13. Coolant flows in the labyrinth cooling channel. Furthermore, a flow and flow rate regulating device is provided on the coolant input passage to regulate the flow rate or flow rate of the coolant in the labyrinth cooling channel, thereby achieving a better cooling effect. Specifically, the coolant can be water. An inlet pipe 4 and an outlet pipe 5 are connected to both ends of the labyrinth cooling channel; the front section of the labyrinth cooling channel connected to the water inlet pipe 4 is arranged close to the side of the shell 1 where the sampling hole 2 is located; the rear section of the labyrinth cooling channel connected to the water outlet pipe 5 is arranged away from the other side of the shell 1 where the sampling hole 2 is located. Specifically, the guide plate 14 is arranged integrally with the inner tube 13.

[0053] The main working process of the sampling rake combining independent sampling and mixed sampling described in this application is briefly described as follows: when the switching mechanism 6 needs to switch to the independent sampling mode (i.e., the independent sampling state), air is supplied from the second air inlet pipe 12, and the slider 8 drives the mixed sampling tube 9 and the independent sampling tube 10 to move to the left to the first limit platform 17. The air inlet hole 21 is connected to the independent sampling channel 22 on the slider 8. The mainstream gas in the gas turbine combustion chamber enters the inner tube 13 through the sampling hole 2, and then the sample gas is taken out through the air inlet hole 21, the independent sampling channel 22 and the independent sampling tube 10; and is sent to multiple sets of gas analysis systems to measure the composition and concentration of the gas at the position of each sampling hole 2, thereby realizing independent sampling and analysis. When the switching mechanism 6 needs to switch to the mixed sampling mode (i.e., the mixed sampling state), air is supplied from the first air inlet pipe 11, and the slider 8 drives the mixed sampling tube 9 and the independent sampling tube 10 to move to the right to the second limit platform 18. The air inlet hole 21 is connected to the mixed sampling channel 23 on the slider 8. The mainstream gas in the gas turbine combustion chamber enters the inner tube 13 through the sampling hole 2 and then enters the mixed sampling channel 23 through the air inlet hole 21. After the multiple sample gases are fully mixed in the mixed sampling channel 23, the sample gases are taken out from the mixed sampling tube 9 and sent to a gas analysis system to measure the gas composition and concentration, thus achieving mixed sampling analysis. In addition, when sampling is completed, the first air inlet pipe 11 and the second air inlet pipe 12 are deflated, and the slider 8 automatically returns to its original position under the action of the spring, cutting off the sampling process.

[0054] The guide plate 14 divides the shell 1 into a labyrinth-like cooling channel. After the cooling water flows in from the water inlet pipe 4, it first flows through the windward surface with the highest temperature (that is, the surface where the sampling hole 2 is located), and then circulates in a "J" shape in the shell 1. Finally, the cooling water flows through the lower surface and leeward side of the shell 1 with a lower temperature, and flows out through the outlet pipe 5.

[0055] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications derived therefrom remain within the scope of protection of the present invention.

Claims

1. A sampling rake combining independent sampling and mixed sampling, characterized in that: include: A shell (1) is provided with a plurality of sampling holes (2) and a plurality of air bleed holes (21); a plurality of inner tubes (13) corresponding to the plurality of sampling holes (2) are provided inside the shell (1); inlets of the inner tubes (13) are connected to the sampling holes (2), and the sampling holes (2) are suitable for obtaining the gas in the combustion chamber; outlets of the inner tubes (13) are connected to the air bleed holes (21); A switching body (7) is connected to the housing (1), and a slideway is provided inside the switching body (7); a slider (8) is slidably connected in the slideway; a plurality of mutually isolated independent sampling channels (22) and a single mixed sampling channel (23) are provided inside the slider (8); a plurality of independent sampling tubes (10) and a mixed sampling tube (9) are provided on the slider (8); the plurality of independent sampling tubes (10) are respectively connected to the plurality of independent sampling channels (22) in a one-to-one correspondence, and the mixed sampling tube (9) is connected to the mixed sampling channel (23); the plurality of independent sampling channels (22) are provided in a one-to-one correspondence with the plurality of air ducts (21); The sampling rake combining independent sampling and mixed sampling has an independent sampling state in which a plurality of independent sampling channels (22) are respectively connected to a plurality of air ducting holes (21) when the slider (8) slides toward one end; and a mixed sampling state in which a mixed sampling channel (23) is connected to a plurality of air ducting holes (21) when the slider (8) slides toward the other end.

2. The sampling rake combining independent sampling and mixed sampling according to claim 1, characterized in that: In the slideway, the space outside the side wall of one end of the slider (8) forms a first cavity (19); in the slideway, the space outside the side wall of the other end of the slider (8) forms a second cavity (20); A first limiting platform (17) is provided in the first cavity (19), and a second limiting platform (18) is provided in the second cavity (20); When the first limiting platform (17) is adapted to contact the slider (8), the sampling rake combining independent sampling and mixed sampling is in an independent sampling state; when the second limiting platform (18) is adapted to contact the slider (8), the sampling rake combining independent sampling and mixed sampling is in a mixed sampling state.

3. The sampling rake combining independent sampling and mixed sampling according to claim 2, characterized in that: A first air intake pipe (11) is connected to the first cavity (19), and a second air intake pipe (12) is connected to the second cavity (20); The second air inlet pipe (12) is adapted to push the slider (8) to slide toward one end when air is ventilated to the second cavity (20); The first air inlet pipe (11) is suitable for pushing the slider (8) to slide toward the other end when air is ventilated to the first cavity (19).

4. The sampling rake combining independent sampling and mixed sampling according to claim 3, characterized in that: A first elastic member (15) is provided between a side wall at one end of the slider (8) and an opposite side wall in the slideway; and a second elastic member (16) is provided between a side wall at the other end of the slider (8) and an opposite side wall in the slideway.

5. The sampling rake combining independent sampling and mixed sampling according to claim 4, characterized in that: The first elastic member (15) and the second elastic member (16) are suitable for resetting the slider (8) to a non-sampling state; in the non-sampling state, the air inlet (21) is disconnected from the independent sampling channel (22) and the mixed sampling channel (23).

6. The sampling rake combining independent sampling and mixed sampling according to any one of claims 1 to 5, characterized in that: An outer wall surface of the housing (1) where the sampling hole (2) is located is provided with a curved surface.

7. The sampling rake combining independent sampling and mixed sampling according to any one of claims 1 to 5, characterized in that: A labyrinth-type cooling channel is formed in the shell (1) by a plurality of guide plates (14), and the labyrinth-type cooling channel is in a "J"-shaped circulation form.

8. The sampling rake combining independent sampling and mixed sampling according to claim 7, characterized in that: The two ends of the labyrinth cooling channel are connected to a water inlet pipe (4) and a water outlet pipe (5); the front section of the labyrinth cooling channel connected to the water inlet pipe (4) is arranged close to one side of the shell (1) where the sampling hole (2) is located; and the rear section of the labyrinth cooling channel connected to the water outlet pipe (5) is arranged away from the other side of the shell (1) where the sampling hole (2) is located.

9. The sampling rake combining independent sampling and mixed sampling according to claim 7, characterized in that: The guide plate (14) is integrally arranged with the inner tube (13).

10. The sampling rake combining independent sampling and mixed sampling according to any one of claims 1 to 5, characterized in that: A flange (3) is provided on the housing (1).

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