Measuring rake

Abstract

The utility model provides a measuring rake, which belongs to the technical field of aero-engines and comprises a rake arm, a plurality of annular bosses are arranged on the rake arm at intervals along the length direction, and sensors are embedded in the annular bosses. A channel is formed in the rake arm, and a wire on the sensor extends to the root of the rake arm through the channel in the rake arm; according to the measuring rake disclosed by the utility model, the sensors are directly arranged in the annular bosses on the rake arm in an embedded manner, so that the pressure of a measuring point is directly detected, a guide pipe does not need to be arranged, and the accuracy of data acquisition is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation engines, in particular to a measuring rake. Background Art

[0002] When an aircraft is flying, due to the influence of various factors, the quality of the flow field in the engine inlet will deteriorate, which will have a certain impact on the working stability and performance of the engine. For example, it will cause accidents such as engine surge and mid-air shutdown. Therefore, it is necessary to install an inlet measurement rake at the engine inlet during flight tests to measure and evaluate the flow field quality.

[0003] Chinese patent document CN109341775A discloses a large overload resistant intake duct combined distortion measurement rake, wherein a plurality of measuring point outer sleeves are provided on the rake arm, and a stainless steel guide pipe is connected inside the measuring point outer sleeve, and the gas is led out through the stainless steel guide pipe and then connected to the pressure sensor outside the measuring section. During operation, the air pressure is collected through the plurality of measuring point outer sleeves, and then the gas is guided to the pressure sensor through the stainless steel guide pipe, and then detected by the pressure sensor.

[0004] However, in the above solution, the distance between the pressure sensor and the actual measuring point is long, there will be pressure loss, and the seal at the stainless steel guide pipe joint may leak. The accumulation of these two factors will cause inaccurate measurement, resulting in the inability to accurately measure the total pressure in the intake duct. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect of inaccurate measurement of the measuring rake in the prior art, thereby providing a measuring rake.

[0006] In order to solve the above technical problems, the utility model provides a measuring rake, comprising: a rake arm, wherein the rake arm has a plurality of annular bosses arranged at intervals along the length direction, and a sensor is embedded in the annular bosses;

[0007] A channel is arranged inside the rake arm, and the wire on the sensor extends to the root of the rake arm through the channel inside the rake arm.

[0008] Optionally, an insulating sheath is provided between the sensor and the inner wall of the annular boss.

[0009] Optionally, the top end of the sensor is flush with the annular boss.

[0010] Optionally, the root of the sensor is filled with sealant.

[0011] Optionally, a sleeve for passing a wire of the sensor is provided at the root of the rake arm, and the sleeve is filled with sealant.

[0012] Optionally, after the rake arm is inserted into the air inlet, its root is fixedly connected via a mounting seat.

[0013] Optionally, the rake arms have a plurality of rake arms that are circumferentially spaced around the inner wall of the air inlet duct, wherein the annular boss at the farthest end of one of the rake arms is arranged at the center of the air inlet duct.

[0014] Optionally, the mounting seat is welded to the outside of the air inlet, and the root of the rake arm is connected to the mounting seat by bolts.

[0015] Optionally, a seal is provided between the root of the rake arm and the mounting seat.

[0016] Optionally, the sealing element is a rubber gasket, a copper gasket or a polytetrafluoroethylene gasket.

[0017] The technical solution of the utility model has the following advantages:

[0018] 1. The measuring rake provided by the utility model directly installs the sensor in a plurality of annular bosses on the rake arm in an embedded manner, so as to directly detect the pressure of the measuring point without setting a guide tube, thereby improving the accuracy of data collection.

[0019] 2. The measuring rake provided by the utility model is provided with an insulating protective sleeve, which is used for filling and sealing on the one hand, and isolating the contact between the sensor and the annular boss on the other hand, thereby preventing measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A front cross-sectional view of a specific implementation of a measuring rake provided in an embodiment of the utility model;

[0022] Figure 2 for Figure 1 A magnified image of area A;

[0023] Figure 3 A three-dimensional diagram of a specific implementation of a measuring rake provided in an embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the installation of a specific implementation manner of the measuring rake provided in the embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1. Rake arm; 2. Annular boss; 3. Insulating sheath; 4. Sensor; 5. Wire; 6. Sleeve; 7. Mounting seat; 8. Air inlet; 9. Seal; 10. First rake arm; 11. Second rake arm. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] 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.

[0031] like Figure 1 As shown, a specific implementation of the measuring rake provided in this embodiment includes: a rake arm 1, a plurality of annular bosses 2 arranged at intervals along the length direction of the rake arm 1, a sensor 4 is embedded in the annular boss 2, and specifically, the sensor 4 can be a pressure sensor 4. When working, the wind pressure at the detection point can be directly detected more accurately through the plurality of sensors 4.

[0032] like Figure 1As shown, a channel is provided inside the rake arm 1, and the wire 5 on the sensor 4 extends through the channel inside the rake arm 1 to the root of the rake arm 1, so that the rake arm 1 is extended through the root to connect with the processor. Specifically, there are a plurality of annular bosses 2 arranged at intervals on the rake arm 1, which may be five or six; when there are six annular bosses 2, after installation, the farthest annular boss 2 away from the root is aligned with the center of the air inlet 8. Of course, the above description is not restrictive, and in some alternative embodiments, the number of annular bosses 2 on the rake arm 1 may be other numbers, which may be selected according to the need of the diameter to be measured.

[0033] The measuring rake provided in this embodiment directly installs the sensor 4 in a plurality of annular bosses 2 on the rake arm 1 in an embedded manner, so as to directly detect the pressure of the measuring point without setting a guide tube, thereby improving the accuracy of data collection.

[0034] like Figure 1 , Figure 2 As shown, in the measurement rake provided in this embodiment, an insulating sheath 3 is provided between the sensor 4 and the inner wall of the annular boss 2. The provision of the insulating protective sheath is used for filling and sealing on the one hand, and isolating the sensor 4 from contacting the annular boss 2 on the other hand to prevent measurement errors. Of course, the above description is not restrictive, and in some alternative embodiments, the insulating sheath 3 can be omitted, and the specific filling and sealing can be completed by using a sealant.

[0035] like Figure 2 As shown, in this embodiment, the top of the sensor 4 is flush with the annular boss 2 to ensure the uniformity of the position of the sensor 4. In addition, the setting of the annular boss 2 can also protect the sensor 4. Of course, the above description is not restrictive. In some alternative embodiments, the top of the sensor 4 may not be flush with the annular boss 2, for example, it may protrude slightly from the annular boss 2.

[0036] like Figure 2 As shown, in this embodiment, the root of the sensor 4 is filled with sealant. That is, the wire 5 at the root of the sensor 4 is filled with sealant between the insulating protective sleeve and the surrounding wire 5; the sealant can be used to stabilize the sensor 4 on the one hand, and seal the tail of the sensor 4 on the other hand. Of course, the above description is not restrictive, and in some alternative embodiments, the tail of the sensor 4 may not be provided with sealant.

[0037] like Figure 1 , Figure 3As shown, in this embodiment, the root of the rake arm 1 is provided with a sleeve 6 for the wire 5 of the sensor 4 to pass through, and the sleeve 6 is filled with sealant. That is, after the wire 5 of the sensor 4 passes through the sleeve 6, a sealant is arranged around the wire 5 in the sleeve 6; the arrangement of the sealant is used to stabilize the wire 5 on the one hand, and to seal the sleeve 6 on the other hand.

[0038] like Figure 3 , Figure 4 As shown, after the rake arm 1 is inserted into the air inlet 8, its root is fixedly connected through the mounting seat 7. That is, the root of the rake arm 1 is provided with a mounting seat 7, and the material of the mounting seat 7 can be 304 stainless steel. The mounting seat 7 is provided with a bolt hole, and the mounting seat 7 can be mounted on the outer wall of the air inlet 8 by bolts.

[0039] like Figure 4 As shown, in this embodiment, the rake arm 1 has a plurality of rake arms 1 arranged at intervals around the inner wall of the air inlet 8, wherein the annular boss 2 at the farthest end of one of the rake arms 1 is arranged at the center of the air inlet 8. Specifically, six rake arms 1 are arranged around the air inlet 8, including a first rake arm 10 having six annular bosses 2 and a second rake arm 11 having five annular bosses 2, wherein the annular boss 2 at the top end of the first rake arm 10 (located at the lowest end of the first rake arm 10 in the figure) faces the center of the air inlet 8.

[0040] like Figure 3 , Figure 4 As shown, in this embodiment, the mounting seat 7 is welded to the outside of the air inlet 8, and the root of the rake arm 1 is connected to the mounting seat 7 by bolts. The connection by bolts can facilitate the installation and removal of the rake arm 1. Of course, the above description is not restrictive. In some alternative embodiments, the mounting seat 7 can also be connected to the air inlet 8 in other ways, for example, by clamping.

[0041] like Figure 4 As shown, in this embodiment, a sealing member 9 is provided between the root of the rake arm 1 and the mounting seat 7. The sealing member is provided to prevent air leakage from the through hole on the air inlet 8 for passing through the rake arm 1. Specifically, the sealing member 9 can be a rubber gasket, a copper gasket or a polytetrafluoro gasket. Of course, the above description is not restrictive. In some alternative embodiments, the sealing member 9 can also be a gasket made of other materials.

[0042] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present utility model.

Claims

1. A measuring rake, characterized in that: include: A rake arm (1), the rake arm (1) having a plurality of annular bosses (2) arranged at intervals along the length direction, the annular bosses (2) having a sensor (4) embedded therein; A channel is provided inside the rake arm (1), and the wire (5) on the sensor (4) extends to the root of the rake arm (1) through the channel inside the rake arm (1).

2. The measuring rake according to claim 1, characterized in that An insulating sheath (3) is provided between the sensor (4) and the inner wall of the annular boss (2).

3. The measuring rake according to claim 1, characterized in that The top end of the sensor (4) is flush with the annular boss (2).

4. The measuring rake according to claim 1, characterized in that The root of the sensor (4) is filled with sealing glue.

5. The measuring rake according to claim 1, characterized in that The root of the rake arm (1) is provided with a sleeve (6) through which the wire (5) of the sensor (4) passes, and the sleeve (6) is filled with sealant.

6. The measuring rake according to any one of claims 1 to 5, characterized in that After the rake arm (1) is inserted into the air inlet (8), its root is fixedly connected via a mounting seat (7).

7. The measuring rake according to claim 6, characterized in that The rake arm (1) has a plurality of rake arms (1) arranged at intervals in the circumferential direction around the inner wall of the air inlet (8), wherein the annular boss (2) at the farthest end of one of the rake arms (1) is arranged at the center of the air inlet (8).

8. The measuring rake according to claim 6, characterized in that The mounting seat (7) is welded to the outside of the air inlet (8), and the root of the rake arm (1) is connected to the mounting seat (7) by bolts.

9. The measuring rake according to claim 8, characterized in that A sealing member (9) is provided between the root of the rake arm (1) and the mounting seat (7).

10. The measuring rake according to claim 9, characterized in that The sealing element (9) is a rubber gasket, a copper gasket or a polytetrafluoroethylene gasket.

Images