High-temperature-resistant sampling rake with variable sampling structure

Abstract

The utility model relates to the technical field of gas turbine measurement and analysis, and discloses a high-temperature-resistant sampling rake with a variable sampling structure, which comprises a sampling rake body, a lock sleeve and a sampling ring pipe, the sampling rake body is provided with a tubular outer shell, and an outer sampling tube, a gas mixing cavity and a central sampling tube which are communicated with one another are sequentially arranged in the outer shell in a segmented manner along the axial direction; the sampling harrow body further comprises a sampling harrow lower end cover and a sampling harrow mounting seat, the sampling harrow lower end cover is arranged at one axial end of the outer shell, and the sampling harrow mounting seat is annularly connected to the outer shell in a sleeving manner; a square sampling rake sample inlet is formed in one side, far away from the outer sampling tube, of the outer shell along the axial direction; the sampling rake sample inlet is communicated with the central sampling tube; a cavity is formed in the lock sleeve, first positioning teeth are inwards arranged on the lock sleeve, and the sampling rake body is sleeved with the lock sleeve; the sampling ring pipe is arranged on the sampling rake body in a sleeving manner, and the sampling ring pipe is arranged in a first positioning groove matched with the first positioning teeth in a sunken manner. According to the utility model, various sampling structures can be switched.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas turbine measurement and analysis, and particularly relates to a high-temperature-resistant sampling harrow with variable sampling structure. BACKGROUND

[0002] The combustion chamber of a gas turbine is a core component of a power system, and its combustion performance directly affects the efficiency, emission level and operation reliability of the unit. During the development and verification of the combustion chamber, gas sampling analysis is a key technical means for evaluating combustion efficiency, pollutant emission characteristics (NOx, CO, UHC, etc.) and gas temperature. As a special device that directly contacts high-temperature gas, the sampling harrow needs to withstand high temperatures of 800-1600℃ and high pressures of 0.1-3.0MPa, and at the same time, it needs to complete representative gas sampling in a complex flow field with a gas flow rate of 20-100m / s.

[0003] The existing sampling harrow is mainly divided into two categories: independent sampling harrow and mixed sampling harrow. The independent sampling harrow is mainly used for measuring and calculating the outlet temperature distribution, and the gas temperature at the corresponding position is calculated by analyzing the component concentration of the high-temperature gas at different positions of the outlet of the combustion chamber, but the number of analyzers required is high, and the cost is large; the mixed sampling harrow is mainly used for measuring and calculating the pollutant emission, combustion efficiency and outlet average temperature, and the pollutant emission, combustion efficiency and outlet average temperature are calculated by analyzing the average component concentration of the high-temperature gas at the outlet of the combustion chamber, and only one set of analyzer is required for the mixed sampling method, but the sampled gas needs to be able to represent the composition of the gas at the outlet of the entire combustion chamber, so the sampling position and sampling structure are required to be high. In addition, the outlet gas concentration distribution and velocity distribution of different combustion chamber structures are different, and the outlet gas concentration distribution and velocity distribution of the same combustion chamber structure under different working conditions are also different, and a single sampling structure cannot realize uniform sampling of the outlet gas of the combustion chamber. SUMMARY

[0004] To solve the existing problems, the utility model provides a high-temperature-resistant sampling harrow with variable sampling structure, which integrates multiple sampling structures on one sampling harrow, which does not affect the downstream flow field, and can realize uniform sampling of high-temperature gas under different outlet gas concentration distributions and velocity distributions of the combustion chamber.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme.

[0006] The utility model provides a kind of sampling structure variable high temperature resistant sampling harrow, including sampling harrow body, lock sleeve and sampling ring pipe;The sampling harrow body has the outer shell body of circular tube, and outer sampling pipe, gas mixing cavity and central sampling pipe are sequentially arranged in communication in the outer shell body along the axial direction;The sampling harrow body further includes sampling harrow lower end cover and sampling harrow mounting seat, and sampling harrow lower end cover is arranged in the axial direction one end of outer shell body, and sampling harrow mounting seat is annularly sleeved on the outer shell body;The side of outer shell body away from outer sampling pipe is provided with square sampling harrow sampling port along the axial direction, and sampling harrow sampling port is in communication with central sampling pipe;The cavity is arranged in the lock sleeve, and first positioning tooth is arranged in the lock sleeve, and the lock sleeve is sleeved on the sampling harrow body;The sampling ring pipe is sleeved on the sampling harrow body, and sampling ring pipe is arranged in the first positioning groove matched with first positioning tooth.

[0007] As a further improvement of the utility model, the first sampling structure, the second sampling structure, the third sampling structure and the fourth sampling structure are arranged on the sampling ring pipe;The first sampling structure is a row of uniformly arranged circular holes along the axial direction;The second sampling structure is a row of circular holes arranged along the axial direction with sparse middle and dense ends;The third sampling structure is a strip-shaped slot hole arranged along the axial direction;The fourth sampling structure is a row of uniformly arranged tapered holes along the axial direction;The first sampling structure, the second sampling structure, the third sampling structure and the fourth sampling structure are respectively collinear with a first positioning groove.

[0008] As a further improvement of the utility model, the upper end surface of the sampling harrow lower end cover is provided with a sampling harrow sealing groove;A sealing convex ring is arranged on the lower end surface of the sampling ring pipe.

[0009] As a further improvement of the utility model, the central sampling pipe further includes sampling heat exchange fins;The sampling heat exchange fins are uniformly distributed on the outer wall of the central sampling pipe along the axial direction.

[0010] As a further improvement of the utility model, the included angle between the sampling heat exchange fins and the outer wall of the central sampling pipe along the water flow direction is less than or equal to 90º.

[0011] As a further improvement of the utility model, the gas mixing cavity is a cylindrical inner cavity, and the cross-sectional area of the mixing cavity is greater than the cross-sectional area of the outer sampling pipe or the central sampling pipe.

[0012] As a further improvement of the utility model, a spring is further included;The sampling harrow mounting seat is provided with an inner ring groove along the circumference of the outer shell body, and the inner ring groove annularly surrounds the outer shell body;The lock sleeve is annularly provided with a sealing boss inwardly, and the sealing boss divides the cavity into two chambers, the upper chamber can accommodate the spring, and the lower chamber can accommodate the sampling ring pipe;The two ends of the spring are respectively connected to the inner ring groove and the upper chamber of the lock sleeve.

[0013] As a further improvement of the utility model, the inner ring groove bottom is provided with a plurality of second positioning grooves; the lock sleeve is uniformly provided with a plurality of outward extending second positioning teeth corresponding to the second positioning grooves.

[0014] As a further improvement of the utility model, the water inlet pipe and the water outlet pipe are connected to the sampling harrow body, the water cooling channel partition plate is radially arranged between the central sampling pipe and the outer shell, and the water cooling channel partition plate divides the outer shell into a semicircular downward water cooling channel and an upward water cooling channel; the downward water cooling channel is connected to the water inlet pipe, and the upward water cooling channel is connected to the water outlet pipe.

[0015] As a further improvement of the utility model, the sampling harrow sampling inlet is a slot hole arranged on the outer shell in the axial direction.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The device is designed by three main structures of the sampling harrow body, the lock sleeve and the sampling ring pipe, and the tubular air inlet is a standardized assembly, so that the production and processing can be facilitated by using standard profiles; the outer sampling pipe, the gas mixing cavity and the central sampling pipe arranged in the sampling body section realize the flexible and compact air inlet, sample mixing and sample feeding functions, and are suitable for sampling requirements in different environments and conditions, and the uniformity and stability of sampling are improved. The central sampling pipe is arranged in the outer shell, so that the impact of the external gas temperature and the gas flow rate is reduced; the first positioning teeth and the first positioning grooves are matched to realize the circumferential limiting function.

[0018] Preferably, the design of the first sampling structure, the second sampling structure, the third sampling structure and the fourth sampling structure provides multiple sampling modes, the appropriate sampling structure can be selected according to the actual needs, and the flexibility and applicability of sampling are improved; the sampling structure is collinear with a first positioning groove, the sampling ring pipe is rotated on the sampling harrow body, the sampling structure of the sampling harrow is selected, the sampling structure is directly opposite to the gas flow direction, the gas can enter the sampling structure better, and the stability and accuracy of the sampling harrow are improved.

[0019] Preferably, the cooperation of the sampling harrow sealing groove and the sealing convex ring is beneficial to improving the sealing property between the sampling ring pipe and the sampling harrow body, and reducing the possibility of air leakage of the sampling air inlet or secondary mixing with the surrounding gas.

[0020] Preferably, the design of the sampling heat exchange fin increases the heat exchange area, improves the heat exchange efficiency when the cold water flows through the outer wall of the sampling central pipe, quickly reduces the sample gas temperature in the sampling pipe, helps to maintain the stability of the sample gas component concentration in the sampling pipe, reduces the influence of high temperature on the sample gas in the sampling pipe, and improves the accuracy of sampling.

[0021] Preferably, the angle between the sampling heat exchange fin and the outer wall of the central sampling tube is less than or equal to 90º, which helps to optimize the heat exchange effect while reducing the resistance and energy consumption of the cold water flow.

[0022] Preferably, the cross-sectional area of the gas mixing chamber is greater than that of the outer sampling tube or the central sampling tube, which helps to increase the volume of the gas mixing chamber, provide space for the short-term residence of the sampled gas, and improve the uniformity of the mixed gas.

[0023] Preferably, the spring is arranged between the sampling rake body and the lock sleeve to provide elastic support, facilitating the quick withdrawal and re-insertion of the lock sleeve into the first positioning groove of the sampling ring tube, and helping to maintain the stability of the relative position of the sampling rake components; the inner ring groove is used to accommodate and limit the lock sleeve; the lock sleeve is provided with a sealing boss, which divides the cavity into two chambers, and can be used for axial positioning when connected; at the same time, the design of the lock sleeve and the sampling rake mounting seat facilitates the fixation and disassembly of the sampling rake.

[0024] Preferably, the second positioning teeth and the second positioning groove are arranged to facilitate the positioning and fixing of the sampling rake body and the lock sleeve during installation and use.

[0025] Preferably, through the connection of the water inlet pipe and the water outlet pipe, and the design of the water cooling channel partition, effective cooling of the sampling rake is achieved, ensuring the long-term stable operation of the sampling rake in high temperature environment.

[0026] Preferably, the groove holes arranged on the outer shell facilitate cooperation with the sampling structure of the sampling ring tube, providing multiple sampling methods suitable for different gas working conditions and environmental conditions. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings described herein are for illustrative purposes only and do not in any way limit the scope of the present disclosure. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present disclosure, and are not specific limitations on the shapes and proportions of the components. In the drawings:

[0028] Figure 1 A schematic diagram of a sampling structure variable high-temperature-resistant sampling rake in an embodiment;

[0029] Figure 2 A cross-sectional view of a sampling structure variable high-temperature-resistant sampling rake in an embodiment;

[0030] Figure 3 A schematic diagram of a sampling rake body in an embodiment;

[0031] Figure 4 A cross-sectional view of the sampling rake body A-A in an embodiment;

[0032] Figure 5 is a schematic view of the lock sleeve in the embodiment;

[0033] Figure 6 is a sectional view of the lock sleeve in the embodiment;

[0034] Figure 7 is a schematic view of the sampling ring in the embodiment;

[0035] Figure 8 is a first sampling structure in the embodiment;

[0036] Figure 9 is a second sampling structure in the embodiment;

[0037] Figure 10 is a third sampling structure in the embodiment;

[0038] Figure 11 is a fourth sampling structure in the embodiment;

[0039] Figure 12 is a schematic view of a high-temperature-resistant sampling harrow mounting structure with variable sampling structures.

[0040] 1, measurement section; 2, sampling harrow; 3, high-temperature gas; 21, sampling harrow body; 22, lock sleeve; 23, sampling ring; 24, spring; 2101, central sampling tube; 2102, sampling heat exchange fin; 2103, outer shell; 2104, sampling harrow sampling inlet; 2105, sampling harrow lower end cover; 2106, sampling harrow sealing groove; 2107, water inlet pipe; 2108, water outlet pipe; 2109, gas mixing cavity; 2110, outer sampling tube; 2111, sampling harrow mounting seat; 2112, spring positioning groove; 2113, second positioning groove; 2114, downward water cooling channel; 2115, upward water cooling channel; 2116, water cooling channel partition; 2117, inner ring groove; 2201, second positioning tooth; 2202, sealing boss; 2203, first positioning tooth; 2301, first positioning groove; 2302, sampling structure; 2303, sealing convex ring; 2304, first sampling structure; 2305, second sampling structure; 2306, third sampling structure; 2307, fourth sampling structure. DETAILED DESCRIPTION

[0041] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0042] It is to be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right" and similar terms are used for explanation only and are not intended to limit the embodiments.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] As shown in Figure 1 and Figure 2 The embodiment provides a high-temperature-resistant sampling harrow with variable sampling structure, which comprises a sampling harrow body 21, a lock sleeve 22, a sampling ring pipe 23 and a spring 24. The lock sleeve 22 is internally provided with a cavity, and the lock sleeve 22 is sleeved on the sampling harrow body 21; the sampling ring pipe 23 is sleeved on the sampling harrow body 21 and extends into the lock sleeve 22.

[0045] As shown in Figure 3 The sampling harrow body 21 has a circular tubular outer shell 2103, and the outer sampling pipe 2110, the gas mixing cavity 2109 and the central sampling pipe 2101 are sequentially arranged in the outer shell 2103 in an axial direction and are connected in communication; the sampling harrow body 21 further comprises a sampling harrow lower end cover 2105 and a sampling harrow mounting seat 2111, the sampling harrow lower end cover 2105 is arranged at one end of the outer shell 2103 in the axial direction, and the sampling harrow mounting seat 2111 is annularly sleeved on the outer shell 2103; the outer shell 2103 is provided with a square sampling harrow sampling inlet 2104 on the side away from the outer sampling pipe 2110 in the axial direction, and the sampling harrow sampling inlet 2104 is connected with the central sampling pipe 2101 in communication. The sampling harrow mounting seat 2111 is provided with an inner annular groove 2117 along the circumferential direction of the outer shell 2103, and the inner annular groove 2117 annularly surrounds the outer shell 2103.

[0046] Specifically, the upper end of the center sampling pipe 2101 is provided with a gas mixing cavity 2109, the center sampling pipe 2101 and the outer sampling pipe 2110 are in communication with the gas mixing cavity 2109, the upper end of the outer shell 2103 is provided with a sampling rake sampling port 2104, sample gas enters the center sampling pipe 2101 through the sampling rake sampling port 2104, and then enters the gas mixing cavity 2109 for sufficient mixing, and then enters the analyzer through the outer sampling pipe 2110 for gas component concentration analysis, so as to avoid that the shape of the sampling rake sampling port 2104 and the non-uniformity of the gas conveying distance cause the floating change of the analyzer inlet gas to be too large. The gas mixing cavity 2109 is a cylindrical cavity, and the cross-sectional area of the mixing cavity is greater than the cross-sectional area of the outer sampling pipe 2110 or the center sampling pipe 2101. As shown in Figures 2-3 the center sampling pipe 2101 further comprises sampling heat exchange fins 2102; the sampling heat exchange fins 2102 are uniformly distributed on the outer wall of the center sampling pipe 2101 in the axial direction. The plurality of heat exchange fins arranged on the outer wall of the center sampling pipe 2101 can effectively enhance the heat exchange efficiency between the sample gas in the center sampling pipe 2101 and the water cooling channel outside. The sampling heat exchange fins 2102 are arranged at an angle less than or equal to 90º with the outer wall of the center sampling pipe 2101 along the water flow direction.

[0047] As shown in Figures 1-3 the sampling rake of the embodiment further comprises a water inlet pipe 2107 and a water outlet pipe 2108 connected with the sampling rake body 21.

[0048] As shown in Figure 4 the center sampling pipe 2101 and the outer shell 2103 are provided with a water cooling channel partition plate 2116 in the radial direction, and the water cooling channel partition plate 2116 divides the outer shell 2103 into a semicircular annular downward water cooling channel 2114 and an upward water cooling channel 2115. An opening is left between the water cooling channel partition plate 2116 and the sampling rake lower end cover 2105, so that the downward water cooling channel 2114 and the upward water cooling channel 2115 are in communication at the side close to the sampling rake lower end cover 2105; the downward water cooling channel 2114 is in communication with the water inlet pipe 2107, and the upward water cooling channel 2115 is in communication with the water outlet pipe 2108. Cooling water enters the downward water cooling channel 2114 from the water inlet pipe 2107, passes through the "U"-shaped cooling circuit to enter the upward water cooling channel 2115, and then is discharged through the water outlet pipe 2108, so as to effectively cool the sampling rake body 21 and effectively avoid the cooling dead zone.

[0049] As shown in Figure 5 the lock sleeve 22 extends outwards to form a second positioning tooth 2201, which is used for circumferential positioning in cooperation with the second positioning groove 2113 in the inner ring groove 2117.

[0050] As shown in Figure 6As shown, the locking sleeve 22 has an inwardly annular sealing boss 2202, which divides the cavity into upper and lower chambers. The upper chamber can accommodate the spring 24, and the lower chamber can accommodate the sampling ring tube 23. The two ends of the spring 24 are respectively connected to the inner annular groove 2117 and the upper end face of the sealing boss 2202 of the locking sleeve 22. The diameter of the lower chamber of the sealing boss 2202 matches the outer diameter of the sampling rake outer shell 2103 to ensure that the locking sleeve 22 can be fitted onto the outer shell 2103.

[0051] Simultaneously, the inner diameter of the sealing boss 2202 is consistent with the inner diameter of the sampling ring tube 23. The sealing boss 2202 is continuously annular. Under the action of the spring, the lower end face of the sealing boss 2202 is attached to the upper end face of the sampling ring tube 23 to form a sealing end face, which can prevent gas from entering the upper chamber and affecting the service life of the spring.

[0052] like Figure 3 As shown, the locking sleeve 22 is circumferentially provided with a plurality of outwardly protruding second positioning teeth 2201, which correspond to the second positioning grooves 2113. Preferably, the number of second positioning grooves 2113 is 1-3. The locking sleeve 22 is fixed by the second positioning teeth 2201 on the outer side and the second positioning grooves 2113 at the bottom of the inner ring groove 2117, preventing the locking sleeve 22 from rotating circumferentially and ensuring that the locking sleeve 22 can only slide up and down.

[0053] Optionally, such as Figure 3 , Figures 8-11 As shown, a spring positioning groove 2112 can be provided in the inner ring groove 2117, and the spring 24 is fixed in the spring positioning groove 2112. The spring 24 is a compression spring.

[0054] The sampling ring tube 23 is prevented from rotating circumferentially by the first positioning groove 2301 and the first positioning tooth 2203 in the locking sleeve 22, ensuring that the sampling structure 2302 on the sampling ring tube 23 faces the upstream of the gas. Various types of sampling structures 2302 are evenly arranged circumferentially on the body of the sampling ring tube 23, and the number of sampling structures 2302 is the same as the number of first positioning grooves 2301 on the sampling ring tube 23. In this embodiment, the number of sampling structures 2302 is 4; the number of sampling structures 2302 can be expanded to more different types, depending on the arrangement, position, diameter, and shape of the air inlet holes. Correspondingly, the number of first positioning grooves 2031 will also be expanded to more. Due to the size limitation of the sampling ring tube 23, the number of sampling structures set on the same sampling ring tube 23 should preferably be limited to 10 types. Figure 7 As shown, a sampling structure 2302 is provided on the sampling ring tube 23.

[0055] like Figures 8 to 11As shown, four typical sampling structures 2302 of the high-temperature-resistant sampling rake with variable sampling structure in the embodiment are a row of uniformly arranged circular holes, a row of circular holes with sparse middle and dense ends, a strip slot hole, and a row of uniformly arranged conical holes. Each sampling structure 2302 is spaced 90°, and the corresponding first positioning groove 2301 of the sampling ring 23 and the first positioning tooth 2203 on the inner side of the lock sleeve 22 are also four. The first sampling structure 2304, the second sampling structure 2305, the third sampling structure 2306, and the fourth sampling structure 2307 are respectively collinear with a first positioning groove 2301.

[0056] As shown in the first sampling structure 2304, the circular holes are uniformly arranged along the axial direction, which is suitable for measuring the uniform distribution of high-temperature gas component concentration and velocity in the measuring section, and the sampling gas flow demand is small. By setting appropriate sampling hole diameter and number, the control of sampling flow can be realized. Figure 8 As shown in the second sampling structure 2305, the circular holes are arranged with sparse middle and dense ends, which is suitable for measuring the non-uniform distribution of high-temperature gas component concentration and velocity in the measuring section, and the sampling gas flow demand is small. For example, the combustion chamber of a gas turbine adopts a swirl flame stabilization method, and under strong swirl conditions, the high-temperature gas in the measuring section presents a velocity distribution of “low central flow speed and high lateral flow speed”. If uniformly distributed circular holes or strip slot holes are used, uniform sampling of high-temperature gas in the measuring section cannot be realized, and sampling holes must be arranged according to equal annular area.

[0057] Figure 9 As shown in the third sampling structure 2306, the strip slot hole is suitable for measuring the uniform distribution of gas component concentration and velocity in the measuring section, and the sampling gas flow demand is large.

[0058] As shown in the fourth sampling structure 2307, the uniformly arranged conical holes are suitable for measuring the uniform distribution of high-temperature gas component concentration and velocity in the measuring section, but the high-temperature gas flow speed is small, and the sampling gas flow demand is large. The conical hole can increase the sampling amount without changing the size of the sampling rake body 21, and realize large-flow sampling under low flow speed. Figure 10 As shown in the fourth sampling structure 2307, the uniformly arranged conical holes are suitable for measuring the uniform distribution of high-temperature gas component concentration and velocity in the measuring section, but the high-temperature gas flow speed is small, and the sampling gas flow demand is large. The conical hole can increase the sampling amount without changing the size of the sampling rake body 21, and realize large-flow sampling under low flow speed.

[0059] Figure 11 As shown in the fourth sampling structure 2307, the uniformly arranged conical holes are suitable for measuring the uniform distribution of high-temperature gas component concentration and velocity in the measuring section, but the high-temperature gas flow speed is small, and the sampling gas flow demand is large. The conical hole can increase the sampling amount without changing the size of the sampling rake body 21, and realize large-flow sampling under low flow speed.

[0060] ​​In actual use, when it is necessary to switch the sampling structure 2302 aligned with the sampling rake inlet port 2104, the lock sleeve 22 is pushed towards the sampling rake mounting seat 2111, the spring 24 is compressed, the first positioning tooth 2203 inside the lock sleeve 22 slides out of the first positioning groove 2301 on the sampling ring 23, at this time the sampling ring 23 can rotate in the circumferential direction, so that the new sampling structure 2302 is aligned with the sampling rake inlet port 2104, then the lock sleeve 22 is released, the lock sleeve 22 moves away from the sampling rake mounting seat 2111 under the action of the spring 24, the first positioning tooth 2203 inside the lock sleeve 22 slides into the first positioning groove 2301 of the sampling ring 23 again, and clamps the sampling ring 23, preventing the sampling structure 2302 from deflecting in the circumferential direction and affecting sampling, at this time the high-temperature gas will enter the central sampling tube 2101 through the sampling structure 2302 aligned with the sampling rake inlet port 2104, the sampling rake inlet port 2104, and the sampling ring 23. The strength of the spring 24 should not be too large to avoid the phenomenon that the first positioning tooth 2203 and the first positioning groove 2301 are difficult to separate.

[0061] Preferably, as shown in Figure 3 the upper end surface of the sampling rake lower end cover 2105 is provided with a sampling rake sealing groove 2106. The lower end surface of the sampling ring 23 body is provided with a sealing convex ring 2303, which cooperates with the sampling rake sealing groove 2106 to ensure that the lower end of the sampling ring 23 does not leak.

[0062] As shown in Figure 12 , a sampling structure variable high-temperature resistant sampling rake of the embodiment is installed on the measurement section 1, the lower end surface of the lock sleeve 22 body is flush with the inner wall of the measurement section 1, the sampling structure 2302 is arranged in the channel of the measurement section 1 and faces the direction of the high-temperature gas 3 flow. The high-temperature gas 3 enters the central sampling tube 2101 through the sampling structure 2302 and the sampling rake inlet port 2104, then enters the mixing chamber 2109 for sufficient mixing, and then enters the analyzer from the outer sampling tube 2110 for gas component concentration analysis. The central sampling tube 2101 with heat exchange fins is surrounded by a water cooling channel, and through efficient heat exchange, the temperature of the high-temperature sample gas is reduced to freezing temperature (according to the requirements of the International Civil Aviation Organization for pollutant measurement, the temperature of the sample gas must be lower than 165±15℃) under the action of cooling water, ensuring that the component concentration of the extracted sample gas is consistent with the component concentration of the high-temperature gas 3, and improving the sampling accuracy.

[0063] The practical advantages of a sampling structure variable high-temperature resistant sampling rake are as follows:

[0064] (1) The free switching of multiple sampling structures is realized on the cylindrical sampling rake, and the smaller sampling rake size not only reduces the influence on the upstream and downstream flow field structure of the sampling rake, but also can meet the uniform sampling of high-temperature gas under different gas concentration distribution and velocity distribution conditions at the outlet of the combustion chamber.

[0065] (2) By reasonable structure design, prevent the circumferential rotation of the sampling ring pipe, ensure that the sampling structure can face the high temperature gas flow direction and align with the sampling rake inlet, control the sampling amount.

[0066] (3) A plurality of heat exchange fins are arranged on the center sampling pipe, the heat exchange efficiency of the high temperature sample gas in the center sampling pipe and the cooling water is improved, the sample gas composition is rapidly frozen, the secondary reaction of the sample gas in the sampling process is avoided, and the sampling precision is effectively improved.

[0067] (4) A mixing chamber with a proper size is arranged between the center sampling pipe and the outer sampling pipe, the secondary mixing of the sample gas is enhanced through the "sudden expansion-sudden contraction" structure, the measurement error caused by the inconsistent sample gas component concentration of different sampling points and the insufficient mixing in the center sampling pipe is prevented, and the representativeness and accuracy of sampling are improved.

[0068] The above embodiment is only one of the implementation manners capable of realizing the technical scheme of the utility model, and the scope of the utility model claimed for protection is not limited by the embodiment, but also includes the changes, replacements and other implementation manners easily thought of by any person skilled in the art within the technical range disclosed by the utility model.

Claims

1. A high-temperature resistant sampling rake with a variable sampling structure, characterized in that, The system includes a sampling rake body (21), a locking sleeve (22), and a sampling ring tube (23). The sampling rake body (21) has a cylindrical outer shell (2103). Inside the outer shell (2103), an external sampling tube (2110), a mixing chamber (2109), and a central sampling tube (2101) are sequentially arranged in sections along the axial direction. The sampling rake body (21) also includes a sampling rake lower end cap (2105) and a sampling rake mounting base (2111). The sampling rake lower end cap (2105) is located at one axial end of the outer shell (2103), and the sampling rake mounting base (2111) is circumferentially sleeved on the outer shell (2103). On the outer shell (2103), a square sampling rake inlet (2104) is provided axially on the side of the outer sampling tube (2110) away from the outer sampling tube (2110), and the sampling rake inlet (2104) is connected to the central sampling tube (2101); the locking sleeve (22) is provided with a cavity, and the locking sleeve (22) is provided with a first positioning tooth (2203) inward, and the locking sleeve (22) is fitted on the sampling rake body (21); the sampling ring tube (23) is fitted on the sampling rake body (21), and the sampling ring tube (23) is recessed in the first positioning groove (2301) that cooperates with the first positioning tooth (2203).

2. The high-temperature resistant sampling rake with variable sampling structure according to claim 1, characterized in that, The sampling ring tube (23) is provided with a first sampling structure (2304), a second sampling structure (2305), a third sampling structure (2306), and a fourth sampling structure (2307); the first sampling structure (2304) is a row of circular holes evenly arranged along the axial direction; the second sampling structure (2305) is a row of circular holes arranged along the axial direction with sparser holes in the middle and denser holes at both ends; the third sampling structure (2306) is a strip-shaped slot hole arranged along the axial direction; the fourth sampling structure (2307) is a row of conical holes evenly arranged along the axial direction; the first sampling structure (2304), the second sampling structure (2305), the third sampling structure (2306), and the fourth sampling structure (2307) are each collinear with a first positioning groove (2301).

3. The high-temperature resistant sampling rake with variable sampling structure according to claim 1, characterized in that, The upper end face of the sampling rake lower end cap (2105) is provided with a sampling rake sealing groove (2106); a sealing protrusion (2303) is provided on the lower end face of the sampling ring tube (23).

4. A high-temperature resistant sampling rake with a variable sampling structure according to claim 1, characterized in that, The central sampling tube (2101) also includes sampling heat exchange plates (2102); the sampling heat exchange plates (2102) are evenly distributed along the axial direction on the outer wall of the central sampling tube (2101).

5. A high-temperature resistant sampling rake with a variable sampling structure according to claim 4, characterized in that, The sampling heat exchange plate (2102) has an angle of less than or equal to 90º with the outer wall of the central sampling tube (2101) along the water flow direction.

6. A high-temperature resistant sampling rake with a variable sampling structure according to claim 1, characterized in that, The mixing chamber (2109) is a cylindrical inner cavity, and the cross-sectional area of ​​the mixing chamber is greater than the cross-sectional area of ​​the outer sampling tube (2110) or the central sampling tube (2101).

7. A high-temperature resistant sampling rake with a variable sampling structure according to claim 1, characterized in that, It also includes a spring (24); the sampling rake mounting base (2111) has an inner ring groove (2117) circumferentially opened along the outer shell (2103), and the inner ring groove (2117) surrounds the outer shell (2103) in a ring shape; the locking sleeve (22) is provided with a sealing boss (2202) in a ring shape inward, and the sealing boss (2202) divides the cavity into upper and lower chambers, the upper chamber can accommodate the spring (24), and the lower chamber can accommodate the sampling ring tube (23); the two ends of the spring (24) are respectively connected to the inner ring groove (2117) and the upper chamber of the locking sleeve (22).

8. A high-temperature resistant sampling rake with a variable sampling structure according to claim 7, characterized in that, The bottom of the inner ring groove (2117) is provided with several second positioning grooves (2113); the lock sleeve (22) is uniformly provided with several outwardly protruding second positioning teeth (2201) in the circumferential direction, which are corresponding to the second positioning grooves (2113).

9. A high-temperature resistant sampling rake with a variable sampling structure according to claim 1, characterized in that, It also includes an inlet pipe (2107) and an outlet pipe (2108) connected to the sampling rake body (21). A water-cooling channel partition (2116) is arranged radially between the central sampling tube (2101) and the outer shell (2103). The water-cooling channel partition (2116) divides the outer shell (2103) into a semi-circular downward water-cooling channel (2114) and an upward water-cooling channel (2115). The downward water-cooling channel (2114) is connected to the inlet pipe (2107), and the upward water-cooling channel (2115) is connected to the outlet pipe (2108).

10. A high-temperature resistant sampling rake with a variable sampling structure according to claim 1, characterized in that, The sampling rake inlet (2104) is a slot provided axially on the outer shell (2103).

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