A measuring rake suitable for fluid measurement in a lumen

Abstract

The application belongs to the technical field of measuring rakes, and specifically relates to a measuring rake suitable for measuring fluid in a cavity, which comprises an upper pipe body, a lower pipe body, and a measuring part. The upper pipe body is connected with the upstream of the cavity, the lower pipe body is connected with the downstream of the cavity, and the two ends of the measuring part are connected with the upper pipe body and the lower pipe body respectively and used for measuring the fluid parameters in the cavity. The measuring part comprises a rake ring, which is installed between the upper pipe body and the lower pipe body, and a capillary measuring pipe, which is located in the rake ring and has an end part opposite to the flow direction of the fluid and used for collecting the fluid parameters. An active end head is movably connected to the inside of the rake ring and in sealing and sliding connection with the outer surfaces of the plurality of capillary measuring pipes. The measuring rake has high measuring efficiency, good measuring effect, high installation precision, simple operation, strong adaptability, high stability, strong regulation and control, and can meet the installation and measurement requirements of different cavities, is convenient to disassemble and install, and can adjust the position of the active end head according to the fluid pressure to meet the measurement requirements under different working conditions.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of measuring rakes, and particularly relates to a measuring rake suitable for fluid measurement in a cavity. BACKGROUND

[0002] In the fields of aerospace and energy power, the accurate measurement of fluid parameters in the fluid cavities of core equipment such as aircraft engines and gas turbines is a core link of equipment performance optimization, fault diagnosis and safe operation, and is suitable for the scene of high-precision measurement of key parameters such as fluid temperature, pressure and flow rate in the fluid cavities of complex thermal equipment such as the inlet duct, nozzle, combustion chamber of an aircraft engine and the compressor of a gas turbine.

[0003] For example, a composite measuring rake is disclosed in Chinese Patent No. CN108731907A to solve the problems of large self-weight of the existing measuring rake made of steel and rubber composite material and replaceable temperature measuring points and dynamic pressure measuring points. The composite measuring rake comprises a rake main body made of carbon fiber composite material, a pre-buried part and a plug part. The pre-buried part is arranged in the interior of the rake main body, and the plug part is arranged at the tail end of the rake body. An end of the pre-buried part away from the rake main body is provided with a measuring point group, and a through hole of a wire tube in communication with the measuring point group extends to the interior of the rake main body and is connected to the plug part. The measuring point group is used for testing the transient temperature of airflow and airflow pressure.

[0004] For another example, a large-size composite material inlet duct measuring rake is disclosed in Chinese Patent No. CN103115747A to achieve integrated collection and measurement of test parameters of an engine inlet flow field, simple and fast installation and dismounting under the conditions of greatly reducing the weight of the rake body and meeting the requirements of rigidity and vibration strength of the measuring rake. The large-size composite material inlet duct measuring rake comprises a skin framework with a U-shaped cross section, which includes a measuring section at the front part and an installation section at the rear part. The installation section of the skin framework is connected to a mounting seat at the root part. A measuring point sheath is arranged on the windward surface of the measuring section of the skin framework. A measuring element is arranged in the measuring point sheath. The measuring element is output to the mounting seat through a conduit. A shock-absorbing sheath with a U-shaped cross section is arranged outside the installation section of the skin framework. There is a gap between the shock-absorbing sheath and the skin framework. The shock-absorbing sheath is connected to the mounting seat at the root part.

[0005] However, similar to the above measuring rakes, it is difficult to balance the measurement accuracy and structural stability of the measuring rakes in a complex flow field environment. The measuring rakes are easily deformed by fluid excitation, which leads to inaccurate measurement data. The installation and dismounting process depends on complex tools and professional operation. Sensor calibration and maintenance require long-time shutdown, which greatly increases the whole life cycle cost of the equipment. The layout of the measuring points lacks systematic planning. In the narrow cavity space, it is difficult to fully cover the fluid parameter gradient change area and completely capture the flow field characteristics.

[0006] However, when the existing measuring rake measures the fluid in the cavity, the measuring tube needs to be installed and fixed by the rake ring. However, when the fluid passes through the rake ring, the fluid will impact the rake ring and cause turbulence, thereby causing the fluid to be disturbed in the measuring rake and affecting the measured pressure value.

[0007] Moreover, when the measuring tube is slightly damaged due to the impact of the fluid in the measuring rake, the damaged position cannot be temporarily limited and protected during the measurement process, thereby affecting the measurement accuracy of the subsequent pressure.

[0008] In addition, the L-shaped structure of the measuring tube makes the fluid impurities easily accumulate at the corner of the measuring tube, which affects the normal flow of the fluid.

[0009] When the structure of the measuring tube is damaged and needs to be replaced, the existing technology needs to stop and disassemble the measuring rake for replacement, which is low in replacement efficiency, difficult to replace, and affects the normal measurement. SUMMARY

[0010] To solve the above problems, the present application provides a measuring rake suitable for measuring fluid in a cavity.

[0011] To achieve the above purpose, the present application provides the following technical scheme: a measuring rake suitable for measuring fluid in a cavity, comprising:

[0012] an upper tube body connected to the upstream of the cavity;

[0013] a lower tube body connected to the downstream of the cavity;

[0014] a measuring part connected to the upper tube body and the lower tube body at both ends, for measuring the fluid parameters in the cavity;

[0015] wherein the measuring part comprises:

[0016] a rake ring installed between the upper tube body and the lower tube body;

[0017] a capillary measuring tube located inside the rake ring and having an end portion opposite to the flow direction of the fluid, for collecting the fluid parameters;

[0018] a movable end head movably connected to the inside of the rake ring and in sealing sliding connection with the outer surface of the plurality of capillary measuring tubes; when the pressure value of the fluid in the capillary measuring tube is increased, the movable end head moves away from the upper tube body; when the pressure value of the fluid in the capillary measuring tube is continuously reduced and less than the set pressure preset value, the movable end head moves towards the upper tube body and is dislocated from the adjacent movable end head; when the capillary measuring tube is damaged, the movable end head moves towards the upper tube body to the maximum distance, and the capillary measuring tube is separated from the movable end head and replaced.

[0019] The measuring rake has high measuring efficiency, good measuring effect, high installation precision, simple operation, strong adaptability, high stability, strong control, and high measuring demand under different working conditions.

[0020] Preferably, it further comprises:

[0021] A pressure measuring cavity is arranged inside the upper pipe body and the lower pipe body for fluid flow, and the inner wall of the pressure measuring cavity is matched with the inner wall of the rake ring;

[0022] A dynamic sensor is fixedly connected to the inner wall of the rake ring for measuring the dynamic pressure value of the fluid inside the rake ring, and the static pressure value measured by the plurality of capillary measuring tubes is used to obtain the fluid parameter value;

[0023] A flange plate is fixedly connected to the outer surface of the upper pipe body and the lower pipe body for connection with the cavity.

[0024] Preferably, the measuring part further comprises:

[0025] A flow cavity is arranged inside the capillary measuring tube for fluid flow recovery in the cavity, and the capillary measuring tube has an L-shaped structure, and the other end of the flow cavity is connected to the measuring assembly outside the cavity and measures pressure;

[0026] A backflow pipe is fixedly connected to the outer surface of the capillary measuring tube near the upper pipe body end for backflow of the fluid to the inside of the flow cavity and reverse blockage, and a backflow cavity is arranged inside the backflow pipe, and one end of the backflow cavity is connected to the inside of the flow cavity;

[0027] A one-way valve is fixedly connected to the inside of the backflow cavity for controlling one-way flow of the fluid, and the flow direction of the one-way valve is from the upper pipe body end to the lower pipe body end.

[0028] Preferably, the measuring part further comprises:

[0029] A follower plate is symmetrically fixedly connected to the movable end head near the lower pipe body end for movement with the movable end head, and the adjacent two follower plates and the movable end head form an active cavity therebetween, and the width value of the active cavity is greater than twice the outer diameter of the capillary measuring tube;

[0030] A through hole is arranged inside the movable end head for active connection of the capillary measuring tube therein, and a sealing ring is fixedly connected to the inner wall of the through hole, and the outer surface of the capillary measuring tube is sealingly and slidingly connected to the inner wall of the sealing ring.

[0031] Preferably, the measuring part further comprises:

[0032] A bottom plate is fixedly connected to the inner wall of the rake ring, the width value of the bottom plate is equal to the width value of the active cavity, and the side wall of the follower plate is sealingly and slidingly connected to the outer surface of the bottom plate.

[0033] The telescopic assembly is fixedly connected with the side wall of the bottom plate at one end and fixedly connected with the side wall of the movable end head at the other end, and is used for adjusting the moving distance value of the movable end head on the outer surface of the capillary measuring tube.

[0034] Preferably, the measuring part further comprises:

[0035] The buffer surface is arranged on the side of the movable end head close to the upper tube body and is used for buffering and distributing the fluid.

[0036] The pressure relief hole is uniformly arranged in the bottom plate and is used for discharging the fluid in the movable cavity.

[0037] Preferably, the measuring part further comprises:

[0038] The elastic sealing plate is fixedly connected with the side wall of the movable end head at one end and fixedly connected with the side wall of the bottom plate at the other end, and the elastic sealing plate is elastic and has the same width value as the movable cavity.

[0039] The arc-shaped plates are fixedly connected with the side wall of the movable end head at the end portion, the arc-shaped plates are matched and enclose a circle, and the arc-shaped plates are used for the flow of the fluid in the cavity.

[0040] Preferably, the measuring part further comprises:

[0041] The splicing shell is clamped on the outer surface of the harrow ring and is used for fixing the inner harrow ring.

[0042] The recovery hole is arranged in the harrow ring and the splicing shell and is used for fixing the plurality of capillary measuring tubes.

[0043] Preferably, the measuring part further comprises:

[0044] The insertion rod is fixedly connected with the side of the upper tube body and the lower tube body, and the harrow ring is symmetrically provided with a plurality of positioning grooves fixedly inserted with the insertion rod.

[0045] The connecting ring is fixedly connected with the side of the upper tube body away from the measuring part and is used for clamping and mounting the upstream of the cavity.

[0046] The inner groove is arranged on the side of the lower tube body away from the measuring part and is used for clamping and mounting the downstream of the cavity.

[0047] Compared with the prior art, the present application has the following beneficial effects:

[0048] 1. The present invention, through the cooperation of components such as upper tube body, lower tube body, rake ring and capillary measuring tube, allows the fluid inside the upper tube body to reach the rake ring and then undergo pressure testing through the capillary measuring tube, thereby continuously and stably measuring the fluid pressure value inside the pressure measuring chamber.

[0049] 2. This invention uses a combination of movable end and telescopic component to ensure that when the measured fluid pressure inside the capillary measuring tube increases, the telescopic component moves the movable end away from the upper tube body. The increased distance between the movable end and the end of the capillary measuring tube reduces the turbulence caused by the collision between the fluid and the movable end, thereby ensuring the continuous and stable flow measurement of the fluid inside the pressure measuring chamber.

[0050] 3. This invention, through the cooperation of components such as a one-way valve and a return pipe, when a blockage occurs at the corner of the capillary measuring tube, the measured internal pressure value of the capillary measuring tube decreases, the movable end moves closer to the upper tube body, the fluid inside the pressure measuring chamber enters the movable chamber along both sides of the follower plate, and the fluid inside the movable chamber enters the capillary measuring tube along the return pipe, thereby achieving reverse unblocking and clearing of the blockage at the corner of the capillary measuring tube, avoiding any impact on the pressure measurement of subsequent fluids.

[0051] 4. This invention, through the cooperation of components such as through holes and follower plates, ensures that when the capillary measuring tube is damaged, the movable end drives the sealing ring inside the through hole to move to the damaged area and temporarily block it. When the capillary measuring tube needs to be replaced, multiple movable ends move to the maximum distance towards the upper tube body and disengage from the capillary measuring tube. This replacement is highly efficient, avoids the need for operators to disassemble and replace it again, and is simple, safe and stable to operate. Attached Figure Description

[0052] Figure 1 This is a frontal three-dimensional structural diagram of the measuring rake of the present invention;

[0053] Figure 2 This is a frontal view of the internal three-dimensional structure of the measuring rake of the present invention;

[0054] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0055] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0056] Figure 5 This is a frontal sectional view of the measuring rake of the present invention;

[0057] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0058] Figure 7 This is a schematic diagram of the internal three-dimensional structure of the measuring rake of the present invention, viewed from the left.

[0059] Figure 8 This is a three-dimensional structural diagram of the measuring part of the present invention;

[0060] Figure 9 This is a frontal three-dimensional structural diagram of the measuring part of the present invention.

[0061] In the diagram: 1. Upper tube body; 2. Measuring section; 201. Capillary measuring tube; 202. Return pipe; 203. One-way valve; 204. Return chamber; 205. Movable end; 206. Follower plate; 207. Through hole; 208. Elastic sealing plate; 209. Arc plate; 2010. Movable chamber; 2011. Buffer surface; 2012. Rake ring; 2013. Base plate; 2014. Pressure relief hole; 2015. Flow chamber; 2016. Guide chamber; 2017. Splicing shell; 2018. Telescopic assembly; 2019. Recovery hole; 2020. Insert rod; 2021. Positioning groove; 3. Lower tube body; 4. Flange; 5. Pressure measuring chamber; 6. Dynamic sensor; 7. Connecting ring; 8. Inner groove. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] like Figures 1-9 As shown, a measuring rake suitable for measuring fluid in a cavity includes: an upper tube 1 connected to the upstream of the cavity; a lower tube 3 connected to the downstream of the cavity; and a measuring part 2, whose two ends are connected to the upper tube 1 and the lower tube 3 respectively, for measuring fluid parameters inside the cavity. Therefore, the fluid inside the cavity flows sequentially along the upper tube 1, the measuring part 2 and the lower tube 3, thereby completing the required fluid pressure measurement process.

[0064] The measuring part 2 comprises a rake ring 2012 installed between the upper tube body 1 and the lower tube body 3, the rake ring 2012 is spliced with the upper tube body 1 and the lower tube body 3 in a manner of improving installation and replacement convenience; a plurality of capillary measuring tubes 201 are uniformly arranged in the rake ring 2012 and the end portions of the capillary measuring tubes 201 are opposite to the flow direction of the fluid, the capillary measuring tubes 201 are used for collecting and measuring the fluid parameters, the fluid in the cavity flows along the capillary measuring tubes 201 and reaches the measuring assembly for measurement, and the capillary measuring tubes 201 have a small diameter and an L-shaped structure, so that the capillary measuring tubes 201 can be bent in the rake ring 2012 and the measurement and recovery effect is ensured.

[0065] The measuring part 2 comprises a rake ring 2012 installed between the upper tube body 1 and the lower tube body 3, the rake ring 2012 is spliced with the upper tube body 1 and the lower tube body 3 in a manner of improving installation and replacement convenience; a plurality of capillary measuring tubes 201 are uniformly arranged in the rake ring 2012 and the end portions of the capillary measuring tubes 201 are opposite to the flow direction of the fluid, the capillary measuring tubes 201 are used for collecting and measuring the fluid parameters, the fluid in the cavity flows along the capillary measuring tubes 201 and reaches the measuring assembly for measurement, and the capillary measuring tubes 201 have a small diameter and an L-shaped structure, so that the capillary measuring tubes 201 can be bent in the rake ring 2012 and the measurement and recovery effect is ensured.

[0066] The movable end head 205 is movably connected in the rake ring 2012 and is in sealing sliding connection with the outer surface of the plurality of capillary measuring tubes 201. The movable end head 205 can move freely in the rake ring 2012, so as to adjust the distance between the movable end head 205 and the end of the capillary measuring tube 201, and correspondingly adjust the turbulence effect of the movable end head 205 on the fluid in the rake ring 2012 and ensure the pressure measurement accuracy of the capillary measuring tube 201. That is, when the pressure value in the capillary measuring tube 201 is measured to increase, the movable end head 205 moves away from the end of the upper pipe body 1, so as to ensure that the turbulence effect of the movable end head 205 on the fluid remains stable when the turbulence effect acts on the end of the capillary measuring tube 201. If the capillary measuring tube 201 leaks, the fluid will continuously act on the leakage and affect the pressure measurement accuracy of the capillary measuring tube 201. Therefore, when the pressure value in the capillary measuring tube 201 is measured to continuously change, the movable end head 205 moves along the outer surface of the capillary measuring tube 201 and blocks the leakage. If the capillary measuring tube 201 is blocked, especially at the corner, the pressure value in the capillary measuring tube 201 is measured to continuously decrease and be less than the set pressure preset value, the movable end head 205 moves close to the end of the upper pipe body 1 and is dislocated from the adjacent movable end head 205. When the capillary measuring tube 201 needs to be replaced, the movable end head 205 moves close to the end of the upper pipe body 1 to the maximum distance, the capillary measuring tube 201 is separated from the limit of the movable end head 205, and the subsequent replacement of the new capillary measuring tube 201 is facilitated.

[0067] The measuring part 2 further comprises a flow cavity 2015 which is arranged in the capillary measuring tube 201 and is used for fluid recovery flow in the fluid cavity. The other end of the flow cavity 2015 is connected with the measuring assembly outside the fluid cavity and is used for pressure measurement. That is, the fluid in the flow cavity 2015 continuously flows to the subsequent measuring assembly for pressure measurement. A backflow pipe 202 is fixedly connected to the outer surface of the capillary measuring tube 201 close to the end of the upper pipe body 1, specifically at the downstream corner of the capillary measuring tube 201, and is used for backflow of the fluid to the inside of the flow cavity 2015 and reverse blockage. The backflow pipe 202 is internally provided with a backflow cavity 204. One end of the backflow cavity 204 is connected with the inside of the flow cavity 2015. The fluid in the movable cavity 2010 enters the inside of the flow cavity 2015 through the backflow cavity 204. Since the backflow pipe 202 is arranged at the downstream corner of the capillary measuring tube 201, the fluid causes the fluid in the flow cavity 2015 to be turbulent and clean the corner. A one-way valve 203 is fixedly connected to the inside of the backflow cavity 204 and is used for controlling one-way flow of the fluid. The flow direction of the one-way valve 203 is from the end of the upper pipe body 1 to the end of the lower pipe body 3. The one-way valve 203 is arranged to enable the fluid to flow only into the inside of the flow cavity 2015 through the backflow cavity 204, and the fluid in the inside of the flow cavity 2015 cannot be discharged through the inside of the backflow cavity 204, thereby further improving the stability and one-way nature of the fluid flow.

[0068] The follow-up plate 206 is symmetrically fixedly connected to the movable end head 205 near one end of the lower pipe body 3, is used for moving with the movable end head 205, that is, when the movable end head 205 moves inside the rake ring 2012, the two side follow-up plates 206 are synchronously driven to move, and the movable cavity 2010 is formed between the adjacent two follow-up plates 206 and the movable end head 205, the width value of the movable cavity 2010 is greater than twice the outer diameter of the capillary measurement pipe 201, the follow-up plate 206 drives the movable cavity 2010 to move synchronously when moving, and the fluid flowing inside the movable cavity 2010 enters the flow cavity 2015 inside the backflow cavity 204 and reversely clears the blockage; the through hole 207 is arranged inside the movable end head 205, and the capillary measurement pipe 201 is movably connected inside the through hole 207, the capillary measurement pipe 201 moves up and down along the through hole 207, and the sealing ring is fixedly connected to the inner wall of the through hole 207, the outer surface of the capillary measurement pipe 201 is sealingly and slidably connected with the inner wall of the sealing ring, the sealing ring is elastic and sealingly and slidably connected with the outer surface of the capillary measurement pipe 201, thereby effectively avoiding the problems that the capillary measurement pipe 201 is continuously impacted by the fluid and vibrates, and the capillary measurement pipe 201 is continuously collided with the movable end head 205 and damaged, and the sealing ring is moved synchronously with the movable end head 205 and scrapes and cleans the outer surface of the capillary measurement pipe 201 when the movable end head 205 moves, further improving the accuracy and stability of the capillary measurement pipe 201 in measuring the fluid.

[0069] The bottom plate 2013 is fixedly connected to the inner wall of the rake ring 2012, the position of the bottom plate 2013 is unchanged, the width value of the bottom plate 2013 is equal to the width value of the movable cavity 2010, and the bottom plate 2013 seals and blocks the movable cavity 2010, the side wall of the follow-up plate 206 is sealingly and slidably connected with the outer surface of the bottom plate 2013, and in the normal case, the inside of the movable cavity 2010 is in a sealed state and the fluid cannot flow into the inside of the movable cavity 2010; the telescopic assembly 2018 has one end fixedly connected with the side wall of the bottom plate 2013 and the other end output end fixedly connected with the side wall of the movable end head 205, and is used for adjusting the movement distance of the movable end head 205 on the outer surface of the capillary measurement pipe 201, which can be a structure such as a plurality of electric telescopic rods, the movement distance of the movable end head 205 inside the rake ring 2012 is adjusted through the output end of the telescopic assembly 2018, so that the disturbance effect of the movable end head 205 on the fluid inside the rake ring 2012 is kept stable.

[0070] The buffer surface 2011 is arranged on the side of the movable end head 205 close to the upper pipe body 1, and is used for buffering and distributing the fluid. The buffer surface 2011 is mostly in an arc structure, and is symmetrically distributed on the movable end head 205. Under the buffering effect of the buffer surface 2011, the fluid in the inside of the rake ring 2012 can uniformly impact the end of the movable end head 205, and the end of the movable end head 205 can avoid causing damage to each other by fluid impact. The pressure relief hole 2014 is uniformly arranged in the inside of the bottom plate 2013, and is used for discharging the fluid in the inside of the movable cavity 2010. When the fluid exists in the inside of the movable cavity 2010, the fluid is continuously and stably discharged along the pressure relief hole 2014, so as to ensure that the pressure in the inside of the movable cavity 2010 is stable. The elastic sealing plate 208 is fixedly connected to the side wall of the end of the movable end head 205 at one end, and is fixedly connected to the side wall end of the bottom plate 2013 at the other end. The elastic sealing plate 208 has elasticity and is the same as the width of the movable cavity 2010. The elastic sealing plate 208 seals and blocks the end of the movable cavity 2010 away from the rake ring 2012, so as to avoid that the fluid in the inside of the rake ring 2012 enters the inside of the movable cavity 2010 and causes influence. The arc-shaped plate 209 is fixedly connected to the side wall of the end of the movable end head 205. The arc-shaped plates 209 are matched and enclose a circle, and are used for the flow of the fluid in the cavity. When the fluid flows in the pressure measuring cavity 5 and passes through the inside of the rake ring 2012, the arrangement of the arc-shaped plates 209 ensures the continuity and stability of the fluid flow.

[0071] The splicing shell 2017 is clamped to the outer surface of the rake ring 2012, and is used for fixing and protecting the inside rake ring 2012. The splicing shell 2017 is spliced and fixed with the outer surface of the rake ring 2012, and the outer surface of the splicing shell 2017 is matched with the outer surfaces of the upper pipe body 1 and the lower pipe body 3. The splicing shell 2017, the upper pipe body 1 and the lower pipe body 3 are smooth planes, which further improve the accuracy of subsequent splicing and installation. The guide cavity 2016 is formed between the splicing shell 2017 and the rake ring 2012, and is used for guiding the flow of the capillary measuring tube 201. The capillary measuring tubes 201 can be guided and connected in series in the inside of the guide cavity 2016, so as to ensure the convenience of the layout of the capillary measuring tubes 201. The recovery hole 2019 is arranged in the inside of the rake ring 2012 and the splicing shell 2017, and is used for fixing and installing the capillary measuring tubes 201. The width of the recovery hole 2019 is equal to the width of the movable cavity 2010. The capillary measuring tube 201 is finally led out of the rake ring 2012 along the recovery hole 2019 and waits for subsequent pressure measuring procedures.

[0072] The plug rod 2020 is fixedly connected to the side of the upper pipe body 1 and the lower pipe body 3 facing each other, and a plurality of positioning grooves 2021 are symmetrically arranged on both sides of the harrow ring 2012 and are inserted and fixed with the plug rod 2020, so that the plug rod 2020 and the positioning groove 2021 are inserted and fixed, thereby further improving the splicing installation accuracy of the upper pipe body 1, the measuring part 2 and the lower pipe body 3, and improving the disassembly convenience; the connecting ring 7 is fixedly connected to the side of the upper pipe body 1 away from the measuring part 2, and is used for being connected and installed with the upstream of the fluid cavity; the inner groove 8 is arranged on the side of the lower pipe body 3 away from the measuring part 2, and is used for being connected and installed with the downstream of the fluid cavity, and the arrangement of the connecting ring 7 and the inner groove 8 is convenient for the splicing accuracy of the pressure measuring harrow and the cavity.

[0073] The present application mainly refers to the pressure value of the fluid, but in actual measurement, the measurement assembly can be suitable for measuring the key parameters such as fluid temperature, pressure and flow rate, and displaying them one by one, and based on the geometric characteristics of the cavity, the inner wall of the measuring section flow channel completely fits the inner shape of the cavity, the harrow ring 2012 is uniformly arranged in the inner wall of the pressure measuring cavity 5 according to the pressure measuring point distribution, and when the point is more, it can be made in sections, so as to ensure that the harrow ring 2012 is closely attached to the inner wall surface, the fluid disturbance influence is reduced by more than 30%, the capillary measuring tube 201 is made of stainless steel material, and the front end positioning measurement section is arranged, the rear end flow channel is slightly expanded to reduce the blockage degree of the flow cavity 2015, a material performance database is established, suitable materials are selected through thermodynamics-mechanical coupling analysis, Inconel718 nickel-based alloy is selected for high temperature and high pressure environment, Hastelloy C-276 is selected for corrosive medium working condition, and laser cladding ceramic coating is supplemented to enhance the protection performance, 30CrMnSiA alloy steel or 7075-T651 aluminum alloy is selected for normal temperature and pressure environment, a lightweight model can be made of composite material, and an electric performance insulation environment can be made of insulating materials such as ceramic and nylon. The above contents are all prior art and will not be described here.

[0074] When the measuring harrow measures the fluid in the cavity, the movable end 205 is needed to install and fix the capillary measuring tube 201, but when the fluid passes through the movable end 205, the fluid will impact the buffer surface 2011 and cause disturbance, thereby causing the fluid to be disturbed in the measuring harrow and affecting the measured pressure value; and when the capillary measuring tube 201 is damaged by the impact of the fluid in the measuring harrow during use, the existing technology cannot temporarily limit the protection of the damaged position, thereby affecting the subsequent pressure measurement accuracy; at the same time, the L-shaped structure design of the capillary measuring tube 201 makes the fluid easy to accumulate at the corner thereof, and the accumulation will affect the normal flow of the fluid in the flow cavity 2015; and when the capillary measuring tube 201 is damaged and needs to be replaced, the existing technology needs to stop and disassemble the measuring harrow for replacement, which is low in replacement efficiency, high in replacement difficulty, and affects the normal measurement.

[0075] In order to solve the above problems, the measuring rake suitable for measuring fluid in the cavity is actually used. First, the measuring rake needs to be installed. The plurality of capillary measuring tubes 201 pass through the recovery hole 2019 and reach the inside of the movable cavity 2010. The end of the capillary measuring tube 201 passes through the through hole 207 inside the movable end 205 and is located inside the upper pipe body 1 waiting for subsequent pressure measurement. At the same time, the plurality of insertion rods 2020 on one side of the upper pipe body 1 and the lower pipe body 3 are inserted and fixed with the positioning groove 2021. The splicing shell 2017 splices and fixes the rake ring 2012, the upper pipe body 1 and the lower pipe body 3. Then the upper pipe body 1 is inserted and fixed with the upstream of the cavity, the lower pipe body 3 is inserted and fixed with the downstream of the cavity, and the flange plate 4 is used to improve the installation and fixation effect. Wait for the subsequent measurement of the fluid.

[0076] After that, the fluid inside the upstream of the cavity enters the inside of the upper pipe body 1, and continues to flow to the inside of the lower pipe body 3 through the rake ring 2012, and finally flows along the lower pipe body 3 into the downstream of the cavity. In the process, when the fluid reaches the inner wall end of the pressure measuring cavity 5, the dynamic sensor 6 measures the dynamic pressure value of the fluid. When the fluid reaches the end of the capillary measuring tube 201, the fluid enters the inside of the flow cavity 2015 and flows along the flow cavity 2015 to the end of the measuring assembly for measurement. The pressure value of the capillary measuring tube 201 reaches the set pressure preset value, and the fluid flows in the pressure measuring cavity 5 and collides with the movable end 205 and the plurality of arc-shaped plates 209, so that the fluid in the pressure measuring cavity 5 is disturbed. The distance between the movable end 205 and the capillary measuring tube 201 is the initial value under the action of the fluid pressure, and the disturbance at this position has a preset value on the fluid at the end of the capillary measuring tube 201. The preset value can be obtained through multiple experiments, which will not be described here.

[0077] When the pressure value of the fluid in the capillary measuring tube 201 is measured to increase, it indicates that the pressure value of the fluid in the pressure measuring cavity 5 increases, and the disturbance caused by the collision between the fluid and the movable end 205 also increases synchronously. When the disturbance reaches the end of the capillary measuring tube 201, it will cause the pressure value of the fluid entering the inside of the flow cavity 2015 to change, which will not only affect the accurate measurement of the subsequent measuring assembly on the fluid pressure value, but also the disturbance of the fluid will cause impact loss at the end of the capillary measuring tube 201. Therefore, the plurality of telescopic assemblies 2018 are started and the output end is shortened. The output end of the telescopic assembly 2018 drives the movable end 205 to move away from the end of the upper pipe body 1. The relationship between the movement and the pressure value can be obtained through multiple experiments. The distance between the end of the movable end 205 and the end of the capillary measuring tube 201 increases, and the fluid flowing in the pressure measuring cavity 5 collides with the buffer surface 2011 of the movable end 205 to generate disturbance. The disturbance reaching the end of the capillary measuring tube 201 still has an initial value.

[0078] Similarly, when the measured pressure value of the fluid inside the capillary measuring tube 201 decreases, the telescopic assembly 2018 is activated and the output end is extended, the output end of the telescopic assembly 2018 drives the movable end head 205 to move close to the end of the upper pipe body 1, the distance between the end of the movable end head 205 and the end of the capillary measuring tube 201 decreases, and the disturbance of the fluid flowing in the pressure measuring cavity 5 to the force acting on the end of the capillary measuring tube 201 returns to the initial value, thereby ensuring that the subsequent fluid entering the flow cavity 2015 is in a stable flow state, improving the accuracy and stability of subsequent pressure measurement.

[0079] However, due to the long-term use of the capillary measuring tube 201 to recover the measured fluid, the fluid impurities are easily blocked at the corner inside the flow cavity 2015, the measured pressure value of the capillary measuring tube 201 continuously decreases, and the pressure value is less than the pressure value of the surrounding capillary measuring tube 201, the telescopic assembly 2018 at this position is activated and extended, the telescopic assembly 2018 drives the movable end head 205 to move close to the end of the upper pipe body 1, the movement of the movable end head 205 is greater than its length value, the movable end head 205 drives the two side follow-up plates 206 to move and pass through the two side movable end heads 205, the fluid inside the pressure measuring cavity 5 enters the movable cavity 2010 on both sides of the follow-up plate 206, and continues to move downward along the movable cavity 2010 to the return pipe 202, under the one-way guiding action of the one-way valve 203, the fluid continuously enters the flow cavity 2015 inside the flow cavity 204 inside the return pipe 202, and because the return pipe 202 is located downstream of the corner of the capillary measuring tube 201, the fluid entering the flow cavity 2015 inside the return cavity 204 continuously impacts the corner of the capillary measuring tube 201, under the action of the fluid in two directions, the fluid at the corner is turbulent, and under the action of the turbulent flow, the fluid impurities and other blockages at the corner are cleared and impacted, effectively ensuring the durability and stability of the capillary measuring tube 201.

[0080] After that, the telescopic assembly 2018 output end drives the movable end head 205 to move reversely and restore to the original position, the movable end head 205 drives the two side follow-up plates 206 to move synchronously and restore to the original position, the fluid inside the pressure measuring cavity 5 cannot continue to flow into the movable cavity 2010 on both sides of the follow-up plate 206, and the fluid inside the movable cavity 2010 is continuously discharged through the plurality of pressure relief holes 2014 inside the bottom plate 2013, and the fluid impurities and other blockages at the corner of the capillary measuring tube 201 are cleared, the fluid inside the pressure measuring cavity 5 continues to enter the flow cavity 2015 inside the capillary measuring tube 201 and is transmitted to the back for pressure measurement.

[0081] When part of the fluid impurities and the like adhere to the outer surface of the movable end head 205, the fluid impurities and the disturbance effect caused by the movable end head 205 to the port of the capillary measuring tube 201 will affect the pressure value of the fluid entering the flow cavity 2015 inside, and the subsequent measurement assembly will measure the change in the pressure value of the fluid inside the capillary measuring tube 201. Then, the plurality of telescopic assemblies 2018 are started and the output end is telescoped, and the output end of the telescopic assembly 2018 drives the movable end head 205 to move. Specifically, the plurality of movable end heads 205 are inclined downward along the inner wall of the pressure measuring cavity 5 to the end of the arc-shaped plate 209. When the fluid inside the pressure measuring cavity 5 reaches the movable end head 205, the fluid will exert a horizontal flow impact force on the fluid impurities adhering to its outer surface along the upper tube body 1 to the end of the lower tube body 3, and also exert a vertical action on the fluid impurities under the action of the plurality of movable end heads 205, thereby making the fluid impurities continuously move towards the end of the arc-shaped plate 209 along the plurality of movable end heads 205 and detach, and the greater the decrease in the pressure value measured by the measurement assembly, the greater the inclination angle of the plurality of movable end heads 205, and the greater the vertical force exerted by the fluid inside the pressure measuring cavity 5 on the fluid impurities adhering to the outer surface of the movable end head 205, and the more easily the fluid impurities slide on the outer surface of the movable end head 205 and detach from the adhering state.

[0082] When the telescopic assembly 2018 drives the movable end head 205 to move on the outer surface of the capillary measuring tube 201, the movable end head 205 drives the sealing ring inside the through hole 207 to move synchronously, and the sealing ring performs elastic scraping on the outer surface of the capillary measuring tube 201, thereby effectively scraping and cleaning the fluid impurities and the like adhering to the outer surface of the capillary measuring tube 201 and attaching them to the outer surface of the movable end head 205, and repeating the above process to clean the fluid impurities adhering to the outer surface of the movable end head 205, effectively improving the stability of the fluid flow at the end of the capillary measuring tube 201 and ensuring the pressure measuring accuracy of the subsequent measurement assembly.

[0083] When the capillary measuring tube 201 is slightly damaged, the fluid flow at the damaged position will change the pressure value of the fluid in the flow cavity 2015 under the action of pressure, and the pressure value measured by the subsequent measuring assembly will change. When the fluid pressure in the pressure measuring cavity 5 changes and the movable end head 205 moves in the harrow ring 2012, the disturbance of the movable end head 205 to the fluid changes the force acting on the damaged position, so the pressure value measured by the measuring assembly changes and is different from the pressure value change measured by the surrounding capillary measuring tube 201. In order to ensure the temporary protection effect during the measurement process, the output end of the telescopic assembly 2018 continuously telescopes and drives the movable end head 205 to move along the outer surface of the capillary measuring tube 201. The movable end head 205 correspondingly drives the sealing ring inside to move. When the movable end head 205 moves to a certain position and the pressure value measured by the measuring assembly reaches the pressure preset value set at the position, it means that the sealing ring temporarily blocks the damaged position at this time. Therefore, the capillary measuring tube 201 can still temporarily measure the fluid pressure in the pressure measuring cavity 5, and the disturbance of the movable end head 205 to the fluid is simply obtained according to the position of the movable end head 205, and the change value of the fluid pressure at the port of the capillary measuring tube 201 is caused. The pressure value of the fluid at the capillary measuring tube 201 is simply measured.

[0084] However, the capillary measuring tube 201 cannot accurately obtain the fluid pressure value in the pressure measuring cavity 5 after being damaged in the above process. If the measurement accuracy is not high, it can be temporarily used, but if accurate measurement is required, the capillary measuring tube 201 needs to be replaced. In order to ensure the replacement of the damaged capillary measuring tube 201 without disassembly, after the fluid in the pressure measuring cavity 5 stops flowing, the telescopic assembly 2018 is started and drives the movable end head 205 to move to the maximum distance close to the upper tube body 1 end. The movable end head 205 moves away from the wrapping and limiting of the through hole 207 on the outer surface of the capillary measuring tube 201. At this time, the capillary measuring tube 201 can move arbitrarily in the movable cavity 2010 after being released from the restraint of the movable end head 205. Then the operator moves the capillary measuring tube 201 away from the telescopic assembly 2018 end and misplaces it with the remaining capillary measuring tubes 201. At this time, the capillary measuring tube 201 is moved outward along the recovery hole 2019, and the capillary measuring tube 201 moves in the movable cavity 2010 and gradually separates from the pressure measuring cavity 5.

[0085] After replacing the new capillary measuring tube 201, it is reinserted into the original position of the movable cavity 2010 along the recovery hole 2019. At this time, the plurality of telescopic assemblies 2018 are started and the output ends are shortened. The telescopic assembly 2018 drives the movable end head 205 to move reversely, the capillary measuring tube 201 is reinserted into the through hole 207 in the movable end head 205, and is resealed and wrapped by the sealing ring. Thus, the replacement of the capillary measuring tube 201 is completed, the maintenance efficiency is improved, and the disassembly of the aircraft equipment is avoided to reduce the pressure measuring efficiency.

[0086] After the above process is completed, the inside of the pressure chamber 5 is re-filled with fluid, and the above process is repeated and the subsequent fluid is measured.

[0087] It is to be understood that the terminology used herein such as first and second, and the like, is only used to distinguish one entity or action from another entity or action, and does not necessarily require or imply any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0088] While embodiments of the present application have been shown and described, it is to be understood that the embodiments described are merely divergences, modifications, replacements and variations of the embodiments of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A measuring rake suitable for use in the measurement of fluid in a lumen, the measuring rake comprising, The utility model relates to a kind of fluid parameter measuring device, including: Upper pipe body (1) is communicated with upstream of cavity; Lower pipe body (3) is communicated with downstream of cavity; Measuring part (2) is communicated with upper pipe body (1) and lower pipe body (3) respectively with both ends, for measuring fluid parameter inside cavity; Wherein, measuring part (2) includes: Rake ring (2012) is installed between upper pipe body (1) and lower pipe body (3); Capillary measuring tube (201) is located inside rake ring (2012) and end is opposite to the flow direction of fluid, for collecting measurement fluid parameter; Movable end (205) is movably connected inside rake ring (2012) and is sealed slidingly connected with the outer surface of multiple capillary measuring tubes (201);When the pressure value of fluid inside capillary measuring tube (201) is measured to increase, movable end (205) moves away from the end of upper pipe body (1);When the pressure value of fluid inside capillary measuring tube (201) is measured to continuously reduce and less than the pressure preset value set, movable end (205) moves close to the end of upper pipe body (1) and is dislocated with adjacent movable end (205);When capillary measuring tube (201) is damaged, movable end (205) moves close to the end of upper pipe body (1) to maximum distance, capillary measuring tube (201) is separated from movable end (205) and is replaced; Backflow pipe (202) is fixedly connected to the outer surface of capillary measuring tube (201) close to the end of upper pipe body (1), for fluid backflow to flow cavity (2015) inside and reverse blockage, and backflow cavity (204) is opened in the inside of backflow pipe (202), one end of backflow cavity (204) is communicated with the inside of flow cavity (2015); Check valve (203) is fixedly connected in the inside of backflow cavity (204), for controlling fluid one-way flow, and the flow direction of check valve (203) is along the end of upper pipe body (1) to the end of lower pipe body (3); Follow-up plate (206) is fixedly connected to the end of movable end (205) close to lower pipe body (3) symmetrically, for moving with movable end (205), and adjacent two follow-up plates (206) are formed with movable cavity (2010) between movable end (205); Pressure relief hole (2014) is evenly opened in the inside of bottom plate (2013), for fluid discharge in movable cavity (2010), when fluid is introduced in the inside of movable cavity (2010), fluid is discharged along pressure relief hole (2014).

2. The measuring rake suitable for luminal fluid measurement according to claim 1, characterized in that, Also including: Pressure measuring cavity (5) is opened in the inside of upper pipe body (1) and lower pipe body (3), for fluid flow, the inner wall of pressure measuring cavity (5) is matched with the inner wall of rake ring (2012); Dynamic sensor (6) is fixedly connected to the inner wall of rake ring (2012), for measuring dynamic pressure value of fluid inside rake ring (2012), and cooperate with the static pressure value measured by multiple capillary measuring tubes (201) to obtain fluid parameter value; Flange plate (4) is fixedly connected to the outer surface of upper pipe body (1) and lower pipe body (3), for being connected with cavity.

3. The measuring rake suitable for luminal fluid measurement according to claim 1, wherein, Measuring part (2) also includes: The flow cavity (2015) is arranged in the capillary measuring tube (201) and used for recovering the fluid in the cavity, and the capillary measuring tube (201) is in an L-shaped structure, and the other end of the flow cavity (2015) is connected with the measuring assembly outside the cavity and used for pressure measurement.

4. The measuring rake suitable for luminal fluid measurement according to claim 1, wherein, The measuring part (2) further comprises: The through hole (207) is arranged in the movable end head (205) and used for movably connecting the capillary measuring tube (201) in the through hole (207), and the inner wall of the through hole (207) is fixedly connected with a sealing ring, and the outer surface of the capillary measuring tube (201) is sealingly and slidably connected with the inner wall of the sealing ring. The width of the movable cavity (2010) is greater than twice the outer diameter of the capillary measuring tube (201).

5. The measuring rake suitable for luminal fluid measurement according to claim 4, characterized in that, The measuring part (2) further comprises: The bottom plate (2013) is fixedly connected with the inner wall of the rabble ring (2012), the width of the bottom plate (2013) is equal to the width of the movable cavity (2010), and the side wall of the follower plate (206) is sealingly and slidably connected with the outer surface of the bottom plate (2013). The telescopic assembly (2018) is fixedly connected with the side wall of the bottom plate (2013) at one end and fixedly connected with the side wall of the movable end head (205) at the other end, and used for adjusting the moving distance of the movable end head (205) on the outer surface of the capillary measuring tube (201).

6. The measuring rake suitable for luminal fluid measurement according to claim 4, wherein, The measuring part (2) further comprises: The buffer surface (2011) is arranged on the side of the movable end head (205) close to the upper pipe body (1) and used for buffering and distributing the fluid.

7. The measuring rake suitable for luminal fluid measurement according to claim 4, wherein, The measuring part (2) further comprises: The elastic sealing plate (208) is fixedly connected with the side wall of the movable end head (205) at one end and fixedly connected with the side wall of the bottom plate (2013) at the other end, the elastic sealing plate (208) is elastic and has the same width as the width of the movable cavity (2010); The arc-shaped plates (209) are fixedly connected with the side wall of the movable end head (205) at the end, the arc-shaped plates (209) are matched and form a circle, and used for the flow of the fluid in the cavity.

8. The measuring rake suitable for luminal fluid measurement according to claim 4, wherein, The measuring part (2) further comprises: The spliced shell (2017) is clamped on the outer surface of the rabble ring (2012) and used for fixing the rabble ring (2012) in the inside, the outer surface of the spliced shell (2017) is matched with the outer surfaces of the upper pipe body (1) and the lower pipe body (3), a guide cavity (2016) is formed between the spliced shell (2017) and the rabble ring (2012) and used for guiding the flow of the capillary measuring tube (201); The recovery hole (2019) is arranged in the rabble ring (2012) and the spliced shell (2017) and used for fixing the capillary measuring tube (201), and the width of the recovery hole (2019) is equal to the width of the movable cavity (2010).

9. The measuring rake suitable for luminal fluid measurement according to claim 1, wherein, The measuring part (2) further comprises: The insertion rod (2020) is fixedly connected with the opposite faces of the upper pipe body (1) and the lower pipe body (3), and the rabble ring (2012) is symmetrically provided with a plurality of positioning grooves (2021) which are fixedly connected with the insertion rod (2020); The connecting ring (7) is fixedly connected with the side of the upper pipe body (1) away from the measuring part (2) and used for being clamped and mounted with the upstream of the cavity. The inner groove (8) is arranged on the side of the lower pipe body (3) away from the measuring part (2) and is used for being connected and installed with the downstream of the cavity.

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