Sensing part installation structure and fan performance test piece for total temperature and total pressure measurement

Abstract

The present invention discloses a sensing part installation structure for measuring internal total temperature and total pressure and a fan performance test piece, wherein the sensing part installation structure for measuring internal total temperature and total pressure includes an internal transfer section and an internal probe for being arranged on an internal casing, a countersunk hole for installing the internal probe is opened on the internal transfer section, the internal probe includes a stud for passing through the countersunk hole, a positioning platform arranged on the stud, a self-locking nut screwed with the stud for fixing the positioning platform on the flow path surface of the internal transfer section, a test section arranged on the positioning platform and a test line for passing through the stud and the positioning platform and then connected to the test section, the end face of the positioning platform in the internal channel matches the flow path surface of the internal transfer section; the internal probe does not need to pass through the outer duct and the double-layer casing, there is no risk of affecting the outer duct performance or gas leakage between the inner and outer ducts, and only the end face of the positioning platform in the inner channel needs to be processed, which can reduce the processing difficulty, shorten the processing cycle, and save processing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of fan performance test pieces, and in particular to a sensing portion mounting structure for measuring total temperature and total pressure. Furthermore, the present invention also relates to a fan performance test piece including the sensing portion mounting structure for measuring total temperature and total pressure. Background Art

[0002] Measuring total temperature and total pressure is an indispensable technical means for turbofan engines to achieve precise air flow management, intake efficiency evaluation, combustion efficiency optimization, compressor stable operation guarantee, and environmental suitability correction. It runs through all aspects of engine design verification, status monitoring and flight control.

[0003] The existing fan performance test piece has a total temperature and total pressure measurement structure such as Figure 1 As shown, the fan performance test piece includes a rotor 100 and a stator 200, and the stator 200 includes an inner casing 201, an outer casing 202 and a diverter casing 203. An inner channel 204 is formed between the inner casing 201 and the diverter casing 203, and an outer channel 205 is formed between the outer casing 202 and the diverter casing 203. After the airflow passes through the rotor blades 101, it is divided into two streams by the diverter casing 203 and enters the inner channel 204 and the outer channel 205 respectively. The outer casing 202 is connected to the diverter casing 203 through the outer stator blades 206 and the outer support plate 207, and the inner casing 201 is connected to the diverter casing 203 through the inner stator blades 208 and the inner support plate 209; the structure of the probe 300 for measuring the inner total temperature and total pressure is shown as follows: Figure 2 As shown, the probe 300 includes a first mounting portion 301, a transition section 302, a second mounting portion 303, and a test section 304. The test section 304 sequentially passes through the outer casing 202, the outer duct 205, and the diverter casing 203 before extending into the inner duct 204 to monitor the total temperature and total pressure of the airflow in the inner duct 204. The first mounting portion 301 is connected to the outer casing 202, and the second mounting portion 303 is connected to the diverter casing 203. This internal total temperature and total pressure measurement structure has the following problems when used:

[0004] First, the test section 304 of the probe 300 must pass through the outer duct 205 and then extend into the inner duct 204 , while the transition section 302 remains in the outer duct 205 . If there are too many probes 300 , the performance of the outer duct 205 will be affected.

[0005] Second, air leakage must be prevented between the outer duct 205 and the inner duct 204. The matching clearance between the first mounting portion 301 and the outer duct casing 202 and the matching clearance between the second mounting portion 303 and the diverter casing 203 must have high precision. In addition, in order to avoid the formation of airflow vortices in the outer duct 205 and the inner duct 204, the first end face 305 of the first mounting portion 301 in the outer duct 205 must match the flow path surface on the outer duct casing 202, the second end face 306 of the second mounting portion 303 in the outer duct 205 must match the outer flow path surface on the diverter casing 203, and the third end face 307 of the second mounting portion 303 in the inner duct 204 must match the inner flow path surface on the diverter casing 203. As a result, the processing flow of the probe 300 is complicated and the processing is difficult.

[0006] 3. Since the front end of the splitter casing 203 is connected to the outer casing 202 via the outer stator blades 206, it is difficult to set the probe 300 at the optimal test position P (axial direction);

[0007] Fourth, in order to keep the probe 300 functioning properly and prevent it from being damaged externally, the fan performance test piece needs to be assembled and disassembled before and after the test and stored. The assembly and disassembly of the probe 300 one by one and the storage thereof are time-consuming and labor-intensive, and the work efficiency is low. Summary of the Invention

[0008] The present invention provides a sensing part installation structure for measuring the internal total temperature and total pressure and a fan performance test piece to solve the technical problems that the existing sensing part installation structure for measuring the internal total temperature and total pressure is not only difficult to manufacture and affects the performance of the external duct, but also difficult to set the probe at the internal optimal test position and the disassembly and storage of the probe is time-consuming and labor-intensive.

[0009] According to one aspect of the present invention, a sensing part installation structure for measuring the internal total temperature and total pressure is provided, comprising an internal transition section and an internal probe for being arranged on an internal casing, the internal transition section being used to form the front section of an internal channel with a diversion casing, the internal probe being used to measure the total temperature and total pressure of the internal channel, a countersunk hole for installing the internal probe is provided on the internal transition section, the internal probe comprising a stud for passing through the countersunk hole, a positioning platform arranged on the stud, a self-locking nut screwed with the stud for fixing the positioning platform on the flow channel surface of the internal transition section, a test section arranged on the positioning platform, and a test line for passing through the stud and the positioning platform and connected to the test section, the end face of the positioning platform in the internal channel matches the flow channel surface of the internal transition section.

[0010] Furthermore, the projection of the positioning platform along the axis direction of the stud is polygonal, and the countersunk hole includes a positioning groove adapted to the positioning platform and a through hole for passing the stud.

[0011] Furthermore, the projection of the positioning platform along the axis of the stud is a quadrilateral, which includes two first sides parallel to the air intake direction and two second sides perpendicular to the air intake direction, the length L1 of the first side is not equal to the length L2 of the second side, the installation position of the test section on the positioning platform and the distance from the second side close to the air intake end of the inner channel is S1, the installation position of the test section on the positioning platform and the distance from the second side away from the air intake end of the inner channel is S2, S1 <S2-1mm。

[0012] Furthermore, the internal adapter section includes a flow channel section, a first flange arranged on the front end of the flow channel section and used to connect the internal stator blades, a mounting ring arranged at the rear end of the flow channel section, and a second flange arranged on the mounting ring for connecting the internal casing, and a sealing adapter seat for passing the test line is arranged on the mounting ring.

[0013] Furthermore, the sealing adapter includes a lead seat arranged on the mounting ring, a clamping ring for passing the test line, a clamping claw sleeved on the clamping ring, and a clamping nut for pressing the clamping claw so that the clamping ring clamps the test line.

[0014] Furthermore, an annular groove is provided on the mounting ring, a sealing ring is embedded in the annular groove, and a pressing portion is provided on the lead seat, the pressing portion abuts against the sealing ring and applies pressure to the sealing ring toward the mounting ring.

[0015] Furthermore, the first flange is provided with nut mounting grooves arranged along the air inlet direction, the nut mounting grooves correspond to the countersunk holes one by one, and the nut mounting grooves are communicated with the corresponding countersunk holes.

[0016] Furthermore, the sensing part installation structure for the internal total temperature and total pressure measurement also includes a plug adapted to the countersunk hole, and the internal probe and / or the plug are arranged in the multiple countersunk holes in the circumferential direction of the internal transition section. The plug includes a stud passing through the countersunk hole, a sealing block arranged on the stud, and a self-locking nut threaded with the stud for fixing the sealing block on the flow path surface of the internal transition section, and the sealing end face of the sealing block in the internal channel matches the flow path surface of the internal transition section.

[0017] Furthermore, sealing gaskets are respectively arranged between the positioning platform and the inner transition section, and between the blocking block and the inner transition section.

[0018] According to another aspect of the present invention, a fan performance test piece is provided, which includes the above-mentioned sensing part installation structure for measuring total temperature and total pressure.

[0019] The present invention has the following beneficial effects:

[0020] The sensing part installation structure of the internal total temperature and total pressure measurement of the present invention has an internal transition section connected to the internal casing, and together with the diverter casing, forms an internal channel. The internal probe extends into the internal channel from the non-channel side of the internal transition section, and does not need to pass through the external duct. On the one hand, it will not affect the performance of the external duct; on the other hand, there is no need to consider the interference of the external stator blades, and the opening position of the countersunk hole can be set at the internal optimal test position P, which can ensure the accuracy of the internal total temperature and total pressure measurement; when assembling the internal probe, the stud is inserted into the countersunk hole from the flow channel surface of the internal transition section, and the self-locking nut is screwed to the stud to fix the positioning platform in the positioning groove. It is only necessary to process the end face of the positioning platform in the internal channel so that the end face It matches the flow path surface of the inner transition section, and compared with the existing probe that needs to process three matching end faces (the first end face, the second end face and the third end face), it can greatly reduce the processing difficulty, shorten the processing cycle, and save processing costs; and the inner probe only passes through the inner transition section. Compared with the existing probe passing through the outer casing and the diverter casing, the inner probe can reduce the processing of high-precision matching clearances, thereby further reducing the processing difficulty, shortening the processing cycle, and saving processing costs; after the fan performance test is completed, all the inner probes are integrated with the inner transition section and can be assembled and disassembled together with the inner transition section. There is no need to disassemble and store the inner probes one by one, which can improve work efficiency and save time and labor costs.

[0021] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural diagram of the existing connotation total temperature and total pressure measurement structure;

[0024] Figure 2 is a schematic diagram of the structure of an existing probe;

[0025] Figure 3 2. It is a structural schematic diagram of the installation structure of the sensing part for measuring the total temperature and total pressure according to a preferred embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the structure of the endogenous probe of the preferred embodiment of the present invention;

[0027] Figure 5 is a structural diagram of a positioning platform according to a preferred embodiment of the present invention;

[0028] Figure 6 It is a structural diagram of the connotation transfer section of the preferred embodiment of the present invention;

[0029] Figure 7 This is a schematic structural diagram of a self-locking nut according to a preferred embodiment of the present invention;

[0030] Figure 8 This is a schematic structural diagram of a plug according to a preferred embodiment of the present invention;

[0031] Figure 9 This is a schematic structural diagram of a sealing adapter according to a preferred embodiment of the present invention;

[0032] Figure 10 It is a structural schematic diagram of a sealing ring according to a preferred embodiment of the present invention.

[0033] Legend:

[0034] 100, rotor; 200, stator; 201, inner casing; 202, outer casing; 203, splitter casing; 204, inner channel; 205, outer channel; 206, outer stator blade; 207, outer support plate; 208, inner stator blade; 209, inner support plate; 300, probe; 301, first mounting portion; 302, transition section; 303, second mounting portion; 304, test section; 305, first end face; 306, second end face; 307, third end face; 1, inner transition section; 11, countersunk hole; 111 , positioning groove; 112, through hole; 12, flow channel section; 13, first flange; 131, nut mounting groove; 14, mounting ring; 15, second flange; 16, sealing adapter; 161, lead seat; 162, clamping ring; 163, clamping claw; 164, tightening nut; 165, clamping part; 166, external thread; 167, axial groove; 168, claw; 17, sealing ring; 2, internal probe; 21, stud; 22, positioning platform; 221, end face; 23, self-locking nut; 24, test line; 25, sealing gasket; 3, plug. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0036] Please also refer to Figures 1 to 10The sensing part installation structure for measuring the internal total temperature and total pressure of the present embodiment includes an internal adapter section 1 and an internal probe 2 for being arranged on the internal casing 201. The internal adapter section 1 is used to form the front section of the internal channel 204 with the diversion casing 203. The internal probe 2 is used to measure the total temperature and total pressure of the internal channel 204. A countersunk hole 11 for installing the internal probe 2 is opened on the internal adapter section 1. The internal probe 2 includes a stud 21 for passing through the countersunk hole 11, a positioning platform 22 arranged on the stud 21, a self-locking nut 23 screwed with the stud 21 for fixing the positioning platform 22 on the flow path surface of the internal adapter section 1, a test section 304 arranged on the positioning platform 22, and a test line 24 for passing through the stud 21 and the positioning platform 22 and then connected to the test section 304. The end face 221 of the positioning platform 22 in the internal channel 204 matches the flow path surface of the internal adapter section 1.

[0037] In the installation structure of the sensing part of the internal total temperature and total pressure measurement of the present embodiment, the internal transition section 1 is connected to the internal casing 201, and together with the diversion casing 203, the internal channel 204 is formed, and the internal probe 2 is extended into the internal channel 204 from the non-flow channel side of the internal transition section 1, and does not need to pass through the external duct 205. On the one hand, it will not affect the performance of the external duct 205; on the other hand, there is no need to consider the interference of the external stator blades 206, and the opening position of the countersunk hole 11 can be set at the internal optimal test position P, which can ensure the accuracy of the internal total temperature and total pressure measurement; when assembling the internal probe 2, the stud 21 is inserted into the countersunk hole 11 from the flow channel surface of the internal transition section 1, and the self-locking nut 23 is screwed with the stud 21 to fix the positioning platform 22 in the positioning groove 111, and only the end face 221 of the positioning platform 22 in the internal channel 204 needs to be adjusted. Machining is performed to align the end face 221 with the flow path surface of the inner transfer section 1. Compared to the existing probe 300, which requires machining three matching end faces (first end face 305, second end face 306, and third end face 307), this significantly reduces machining difficulty, shortens machining cycle, and saves machining costs. Furthermore, the inner probe 2 only passes through the inner transfer section 1. Compared to the existing probe 300, which passes through the outer casing 202 and the diverter casing 203, the inner probe 2 can reduce the need for high-precision clearance machining, further reducing machining difficulty, shortening machining cycle, and saving machining costs. After the fan performance test is completed, all inner probes 2 are integrated with the inner transfer section 1 and can be assembled and disassembled together with the inner transfer section 1, eliminating the need to disassemble and store each inner probe 2 individually. This improves work efficiency and saves time and labor costs. Optionally, a temperature test probe is located on the test section 304, and the test line 24 is a temperature test lead. Optionally, a pressure test probe is located on the test section 304, and the test line 24 is a pressure test lead.

[0038] like Figure 6As shown, in this embodiment, the projection of the positioning table 22 along the axis direction of the stud 21 is polygonal. The countersunk hole 11 includes a positioning groove 111 adapted to the positioning table 22 and a through hole 112 for passing through the stud 21. The polygonal positioning table 22 and the positioning groove 111 cooperate to limit the positioning table 22 and prevent it from rotating in the positioning groove 111, ensuring that the end face 221 of the positioning table 22 matches the flow channel surface of the inner transfer section 1.

[0039] As Figure 5 shown, in this embodiment, the projection of the positioning table 22 along the axis direction of the stud 21 is quadrilateral, which includes two first sides parallel to the intake direction and two second sides perpendicular to the intake direction. The length L1 of the first side is not equal to the length L2 of the second side. The installation position of the test section 304 on the positioning table 22 is at a distance S1 from the second side close to the intake end of the inner channel 204, and the installation position of the test section 304 on the positioning table 22 is at a distance S2 from the second side away from the intake end of the inner channel 204, and S1 < S2 - 1 mm; L1 ≠ L2 can prevent the orientation of the end face 221 from being perpendicular to the air flow direction during assembly; S1 < S2 - 1 mm, the installation position of the inner probe 2 is biased towards the intake end of the inner channel 204, providing an indication for the installation of the end face 221 along the air flow direction, playing a role in preventing misinstallation, ensuring that the end face 221 matches the flow channel surface of the inner transfer section 1, and avoiding the formation of a step between the end face 221 and the flow channel surface of the inner transfer section 1 due to the wrong orientation of the end face 221 when assembling the inner probe 2, resulting in air flow vortices at the step, thereby ensuring the stability of the flow field in the inner channel 204.

[0040] As Figure 2 、 Figure 6 、 Figure 7 and [[ID=!15]] Figure 8 shown, in this embodiment, the inner transfer section 1 includes a flow channel section 12, a first flange 13 disposed at the front end of the flow channel section 12 and used to connect the inner stator vane 208, an installation ring 14 disposed at the rear end of the flow channel section 12, and a second flange 15 disposed on the installation ring 14 and used to connect the inner casing 201. A sealing adapter seat 16 for passing through the test line 24 is disposed on the installation ring 14. Threaded holes are provided on the first flange 13 and the second flange 15. The front end of the inner transfer section 1 is connected to the inner stator vane 208 by bolts, and the rear end of the inner transfer section 1 is connected to the inner casing 201 by rear-end bolts. The installation ring 14 can provide a support platform for the sealing adapter seat 16, and can keep the chambers on both sides of the installation ring 14 not connected when the test line 24 passes through the installation ring 14.

[0041] As Figure 9As shown, in this embodiment, the sealing adapter 16 includes a lead seat 161 arranged on the mounting ring 14, a clamping ring 162 for passing the test line 24, a clamping claw 163 sleeved on the clamping ring 162, and a tightening nut 164 for pressing the clamping claw 163 so that the clamping ring 162 clamps the test line 24; the lead seat 161 is screwed onto the mounting ring 14, and a pressing portion 165 and an external thread 166 are arranged on the lead seat 161. The clamping ring 162 is made of rubber material, and the first end of the clamping claw 163 is divided by a plurality of axial grooves 167 to form a claw portion 168. The test line 24 passes through the clamping ring 162, and the clamping claw 163 is sleeved on the clamping ring 162. On the top, one end of the clamping ring 162 and the clamping claw 163 facing away from the claw portion 168 is inserted into the inner hole of the lead holder 161, and the other end is outside the inner hole of the lead holder 161. The internal thread of the clamping nut 164 is threadedly connected with the external thread 166 of the lead holder 161. By rotating the clamping nut 164 to make it move axially, the clamping nut 164 presses the claw portion 168 through the internal abutment surface, so that the clamping claw 163 drives the clamping ring 162 to contract, and the test line 24 is tightened and sealed by the contraction of the clamping ring 162. Therefore, when the test line 24 passes through the mounting ring 14, the chambers on both sides of the mounting ring 14 are kept disconnected, preventing the lubricating oil mist in the bearing cavity from flowing into the air flow channel.

[0042] like Figure 10 As shown, in this embodiment, an annular groove is formed on the mounting ring 14, in which a sealing ring 17 is embedded. A pressing portion 165 is provided on the lead holder 161. The pressing portion 165 abuts the sealing ring 17 and applies pressure to the sealing ring 17 toward the mounting ring 14. The annular groove ensures that the compression rate of the sealing ring 17 after installation is between 10% and 30%, which not only ensures effective contact pressure but also prevents the sealing ring 17 from being over-compressed and causing permanent deformation. On the one hand, the pressing portion 165 on the lead holder 161 abuts the sealing ring 17, allowing the sealing ring 17 to seal the gap between the lead holder 161 and the mounting ring 14, ensuring isolation between the chambers on both sides of the mounting ring 14. On the other hand, the pressing portion 165 can serve as a clamping position, allowing workers to rotate the lead holder 161 by clamping the pressing portion 165 with a tool, resulting in a simple structure and easy operation. Optionally, the pressing portion 165 is a regular polygon. Optionally, a plurality of annular grooves are concentrically arranged on the mounting ring 14 , and a sealing ring 17 is embedded in each annular groove to achieve multi-stage sealing, thereby ensuring that the chambers on both sides of the mounting ring 14 are isolated from each other.

[0043] like Figure 6 、 Figure 7 and Figure 8As shown, in this embodiment, a nut mounting groove 131 arranged along the air intake direction is provided on the first flange 13, the nut mounting groove 131 corresponds one-to-one to the countersunk hole 11, and the nut mounting groove 131 is connected to the corresponding countersunk hole 11; the nut mounting groove 131 is a through groove. On the one hand, when disassembling and assembling the internal probe 2, the self-locking nut 23 can be rotated through the nut mounting groove 131, which is convenient for operation; on the other hand, the nut mounting groove 131 can reduce the weight of the internal transfer stage 1, thereby reducing the energy consumption of the engine.

[0044] like Figure 7 and Figure 8 As shown, in this embodiment, the sensing part installation structure for the internal total temperature and total pressure measurement also includes a plug 3 adapted to the countersunk hole 11, and the internal probes 2 and / or plugs 3 are arranged in the multiple countersunk holes 11 on the circumference of the internal transition section 1. The plug 3 includes a stud 21 passing through the countersunk hole 11, a blocking block arranged on the stud 21, and a self-locking nut 23 screwed to the stud 21 for fixing the blocking block on the flow path surface of the internal transition section 1. The blocking end face of the blocking block in the internal channel 204 matches the flow path surface of the internal transition section 1; the structure of the plug 3 The structure is similar to that of the internal probe 2, except that there is no mounting hole for installing the test section 304 on the blocking block. The plug 3 is a part that replaces the empty space of the internal probe 2, and is used to level the flow surface of the internal channel 204 and prevent gas leakage without affecting the performance of the internal channel 204. Therefore, more countersunk holes 11 can be designed in the circumferential direction of the internal transition section 1. When in use, the countersunk holes 11 where the internal probe 2 needs to be installed are selected according to needs, and the countersunk holes 11 where the internal probe 2 is not installed are blocked with plugs 3 to ensure testing requirements.

[0045] like Figure 7 As shown, in this embodiment, a sealing gasket 25 is arranged between the blocking block and the internal transition section 1 to prevent the gas in the internal channel 204 from leaking from the fitting gap between the plug 3 and the countersunk hole 11; a sealing gasket 25 is arranged between the positioning platform 22 and the internal transition section 1 to prevent the gas in the internal channel 204 from leaking from the fitting gap between the internal probe 2 and the countersunk hole 11.

[0046] like Figure 3As shown, a fan performance test piece includes the above-mentioned sensing part installation structure for measuring the internal total temperature and total pressure, the internal transition section 1 is connected to the internal casing 201, and together with the diverter casing 203 forms an internal channel 204, the internal probe 2 extends into the internal channel 204 from the non-channel side of the internal transition section 1, and does not need to pass through the outer duct 205. The probe can be set at the internal optimal test position P, and the internal probe 2 does not need to pass through the outer duct 205 and the double-layer casing (the outer duct 202 and the diverter casing 203), and there is no risk of affecting the outer duct performance or gas leakage between the inner and outer ducts. In addition, the internal probe 2 only needs to process the end face 221 of the positioning platform 22 in the internal channel 204, which can reduce the processing difficulty, shorten the processing cycle, and save processing costs.

[0047] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. The sensing part installation structure for total temperature and total pressure measurement is characterized by: The invention comprises an internal transfer section (1) and an internal probe (2) for being arranged on an internal casing (201), wherein the internal transfer section (1) is used to form a front section of an internal channel (204) with a diversion casing (203), and the internal probe (2) is used to measure the total temperature and total pressure of the internal channel (204). The internal transfer section (1) is provided with a countersunk hole (11) for installing the internal probe (2), and the internal probe (2) comprises a stud (21) for passing through the countersunk hole (11), a stud arranged on the stud (2 1), a positioning platform (22) on the inner channel (204), a self-locking nut (23) screwed to the stud (21) for fixing the positioning platform (22) on the flow path surface of the inner transition section (1), a test section (304) arranged on the positioning platform (22), and a test line (24) for passing through the stud (21) and the positioning platform (22) and then connected to the test section (304), wherein the end face (221) of the positioning platform (22) in the inner channel (204) matches the flow path surface of the inner transition section (1).

2. The sensing part installation structure for measuring total temperature and total pressure according to claim 1, characterized in that: The projection of the positioning platform (22) along the axis direction of the stud (21) is polygonal, and the countersunk hole (11) comprises a positioning groove (111) adapted to the positioning platform (22) and a through hole (112) for passing the stud (21).

3. The sensing part installation structure for measuring total temperature and total pressure according to claim 1 or 2, characterized in that: The projection of the positioning platform (22) along the axis of the stud (21) is a quadrilateral, which includes two first sides parallel to the air intake direction and two second sides perpendicular to the air intake direction. The length L1 of the first side is not equal to the length L2 of the second side. The installation position of the test section (304) on the positioning platform (22) is at a distance S1 from the second side close to the air intake end of the inner channel (204). The installation position of the test section (304) on the positioning platform (22) is at a distance S2 from the second side away from the air intake end of the inner channel (204). S1 <S2-1mm。 4. The sensing part installation structure for measuring total temperature and total pressure according to claim 3, characterized in that: The internal adapter section (1) includes a flow channel section (12), a first flange (13) arranged on the front end of the flow channel section (12) and used to connect the internal stator blade (208), a mounting ring (14) arranged on the rear end of the flow channel section (12), and a second flange (15) arranged on the mounting ring (14) for connecting the internal casing (201), and a sealing adapter seat (16) for passing the test line (24) is arranged on the mounting ring (14).

5. The sensing part installation structure for measuring total temperature and total pressure according to claim 4, characterized in that: The sealing adapter (16) includes a lead base (161) arranged on the mounting ring (14), a clamping ring (162) for passing the test line (24), a clamping claw (163) sleeved on the clamping ring (162), and a tightening nut (164) for pressing the clamping claw (163) so that the clamping ring (162) clamps the test line (24).

6. The sensing part installation structure for measuring total temperature and total pressure according to claim 5, characterized in that: An annular groove is provided on the mounting ring (14), a sealing ring (17) is embedded in the annular groove, a pressing portion (165) is provided on the lead seat (161), the pressing portion (165) abuts against the sealing ring (17) and applies pressure to the sealing ring (17) toward the mounting ring (14).

7. The sensing part installation structure for measuring total temperature and total pressure according to claim 4, characterized in that: The first flange (13) is provided with a nut mounting groove (131) arranged along the air intake direction, the nut mounting groove (131) corresponds to the countersunk hole (11) one by one, and the nut mounting groove (131) is communicated with the corresponding countersunk hole (11).

8. The sensing part installation structure for measuring total temperature and total pressure according to claim 1, characterized in that: It also includes a plug (3) adapted to the countersunk hole (11), and the internal probe (2) and / or the plug (3) are arranged in the multiple countersunk holes (11) on the circumference of the internal transition section (1). The plug (3) includes a stud (21) passing through the countersunk hole (11), a blocking block arranged on the stud (21), and a self-locking nut (23) screwed to the stud (21) for fixing the blocking block on the flow path surface of the internal transition section (1), and the blocking end face of the blocking block in the internal channel (204) matches the flow path surface of the internal transition section (1).

9. The sensing part installation structure for measuring total temperature and total pressure according to claim 8, characterized in that: Sealing pads (25) are respectively arranged between the positioning platform (22) and the inner transition section (1), and between the blocking block and the inner transition section (1).

10. A fan performance test piece, characterized in that: A sensing part installation structure for measuring total temperature and total pressure comprising the structure described in any one of claims 1 to 9.

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