A digital precision pressure measuring device applied to liquid engine fuel flow

Abstract

The utility model discloses a kind of digital precision pressure measuring devices applied to liquid engine fuel flow, belong to liquid engine fuel flow technical field, including measuring body, connecting pipe, measurement display piece, prevent miscellaneous assembly, leakage prevention component, clamping assembly, damping component and adjusting assembly;The cooperation of the above-mentioned components in the application, the port can be automatically shielded, so as to avoid external impurities directly into the inside of connecting pipe;Make feeding pipeline can be clamped half hoop stable limiting during measurement process, so that the measuring device can keep the stable connection of feeding pipeline and measuring body under vibration condition, avoid fluid state fluctuation caused by feeding pipeline shaking, improve measurement stability from structural level;When vertical or horizontal vibration occurs during testing process, damping longitudinal slide and damping transverse slide passively slide in damping groove, and damping spring absorbs vibration energy.

Description

Technical Field

[0001] This utility model relates to the field of liquid engine fuel flow technology, specifically to a digital precision pressure measurement device for liquid engine fuel flow. Background Technology

[0002] Liquid rocket fuel is a liquid, combustible substance used to generate heat or power. It mainly consists of liquid hydrogen, liquid oxygen, kerosene, and liquid methane. There is also synthetic gasoline produced through coal liquefaction, dry distillation of coal and oil shale, and the Fischer-Tropsch synthesis of carbon monoxide and hydrogen. Liquid engine fuel refers to the combustible liquid propellant used in liquid-fueled engines. It is mainly divided into petroleum-based fuels, biofuels, and synthetic fuels, and is widely used in aerospace, aviation, and industrial fields. A digital precision pressure measuring device is an instrument that measures pressure using high-precision sensors and electronic circuitry. It can display pressure values ​​digitally and supports various functions such as alarms and signal conversion.

[0003] However, in actual testing and calibration, existing digital precision pressure measurement devices typically have their supply pipes only connected to one side of the pipeline, leaving the other end open for extended periods without effective protection against the external environment. Because this unconnected end is directly exposed to the testing environment, dust, moisture, or other impurities can easily enter the device through the supply pipe. This is particularly problematic during long-term or repeated testing. Impurities entering the device not only adhere to the sensing cavity or the inner wall of the flow channel, affecting the stable flow of liquid fuel within the pipeline, but may also interfere with the measurement accuracy of the pressure detection element, leading to errors in the engine liquid fuel flow measurement results.

[0004] Furthermore, during testing, digital precision pressure measuring devices typically need to operate alongside the test bench or engine, making them susceptible to vibration. In the absence of stability and protection at the unconnected ends of the feed pipe, fluid conditions are more prone to fluctuation, further amplifying data volatility or deviation. To ensure measurement stability, existing technologies often require extending the feed pipe length to buffer flow disturbances, which not only increases the complexity of the testing system layout but also reduces the effectiveness and efficiency of the digital precision pressure measuring device to some extent. Utility Model Content

[0005] The purpose of this invention is to provide a digital precision pressure measurement device for fuel flow in liquid engines. This device addresses the problems of existing digital precision pressure measurement devices, where the unconnected end of the feed pipe is exposed to the external environment for a long time during testing and calibration, lacking effective protection. This allows external impurities to easily enter the device and affect measurement accuracy. Additionally, under vibration conditions, the fluid state is unstable, and the measurement data is prone to fluctuations or deviations. Furthermore, the device requires extending the feed pipe to improve stability, resulting in a complex system structure and reduced testing efficiency and effectiveness.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A digital precision pressure measurement device for fuel flow in a liquid engine, comprising: Measurement body; A connecting pipe extends horizontally through both sides of the measuring body; one end of the connecting pipe is used for detachable connection to a feeding pipe. A measuring display unit, located on the upper side of the measuring body, is used to measure the flow rate of liquid fuel flowing through the connecting pipe and display the measurement data; Anti-debris components, including anti-debris cover, anti-debris frame and reset component; The anti-debris frame is fixed inside the connecting pipe and has a gap between it and the inner wall of the connecting pipe; one end of the reset member slides through the anti-debris frame along the axial direction of the connecting pipe, and is used to drive the anti-debris cover to block the other end of the connecting pipe.

[0007] A further technical solution is that the anti-debris frame includes an inner ring and multiple connecting rods; the inner ring is coaxially disposed inside the connecting tube; one end of the multiple connecting rods is radially fixed to the outer periphery of the inner ring, and the other end is fixed to the inner sidewall of the connecting tube.

[0008] A further technical solution is that the reset component includes a tension spring, a connecting rod, and a limiting plate; the connecting rod slides through the inner ring; the limiting plate is coaxially disposed at the end of the connecting rod away from the anti-fouling cover, and the outer diameter of the limiting plate is larger than the inner diameter of the inner ring; the other end of the connecting rod is fixed to the anti-fouling cover; the tension spring is sleeved on the connecting rod, and its two ends are respectively fixed to the limiting plate and the inner ring.

[0009] A further technical solution includes a leak-proof component; the leak-proof component includes a leak-proof tube, two first connecting rings, and two second connecting rings; the two first connecting rings are sleeved on both ends of the connecting tube; the two second connecting rings are coaxially fixed to the inner wall of the leak-proof tube; the leak-proof tube is coaxially sleeved on the outside of the connecting tube; the first connecting rings and the second connecting rings are fixedly connected.

[0010] A further technical solution includes a base and clamping assemblies disposed on both sides of the feeding pipe; the clamping assemblies include a clamping plate, a telescopic member, and a clamping half-hoop; the clamping plate is vertically disposed on the base; the telescopic member has a telescopic end that moves radially along the feeding pipe; the clamping half-hoop is fixed to the telescopic end.

[0011] A further technical solution is that the clamping plate is provided with a vibration damping component; the vibration damping component includes a vibration damping longitudinal slider and a buffer; the clamping plate has a vertical vibration damping groove; the vibration damping longitudinal slider is slidably disposed in the vertical vibration damping groove; the telescopic component is horizontally fixed on the vibration damping longitudinal slider; the buffer is used to buffer the passive sliding of the vibration damping longitudinal slider.

[0012] A further technical solution is that the buffer includes a damping rod, a damping spring, a damping horizontal slider, and a swing rod; a horizontal damping groove is formed on the clamping plate; the damping rod is horizontally disposed on the clamping plate and located outside the horizontal damping groove; there are two damping horizontal sliders, which are slidably sleeved on the damping rod, and the damping horizontal sliders are slidably connected to the horizontal damping groove; the damping spring is sleeved on the damping rod and fixed to the two damping horizontal sliders; there are two swing rods, and the two ends of each swing rod are respectively hinged to the damping horizontal slider and the damping vertical slider.

[0013] A further technical solution is that the base has an adjustment cavity; the adjustment cavity has an adjustment assembly; the adjustment assembly includes an adjustment plate and a driving component; the surface of the base has an adjustment groove communicating with the adjustment cavity; one end of the clamping plate is fixed to the adjustment plate through the adjustment groove; the driving component is used to drive the adjustment plate to move along the axial direction of the connecting pipe, so as to drive the clamping plate to slide along the adjustment groove.

[0014] A further technical solution is that the adjustment cavity is provided with a guide bar; the adjustment plate has a guide opening; and the adjustment plate is slidably connected to the guide bar through the guide opening.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This application introduces an anti-impurity component at the end of the connecting pipe that is not connected to the supply pipe. When the device is under testing or calibration and one end of the connecting pipe is open, the anti-impurity component automatically blocks that port, thus preventing external impurities from directly entering the interior of the connecting pipe. This structure achieves protection without manual intervention, effectively improving the reliability and safety of the digital precision pressure measuring device during testing and calibration.

[0016] By incorporating a clamping assembly on the base, the feed pipe is stably clamped and limited during measurement, reducing swaying and displacement of the feed pipe during test bench or engine operation. This ensures a stable connection between the feed pipe and the measuring device under vibration conditions, preventing fluid fluctuations caused by feed pipe swaying, thus improving measurement stability from a structural perspective. The telescopic component allows the clamping half-hoop to move radially along the feed pipe, accommodating different feed pipe specifications and enhancing the device's versatility.

[0017] By installing a vibration damping assembly consisting of a damping longitudinal slider, a damping transverse slider, a damping spring, and a swing rod on the clamping plate, the clamping assembly can generate multi-directional buffer displacement under vibration conditions. When vertical or horizontal vibration occurs during the test, the damping longitudinal slider and the damping transverse slider passively slide within the damping groove, and the damping spring absorbs the vibration energy. Attached Figure Description

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration: Figure 1 This is a three-dimensional drawing of the present invention.

[0019] Figure 2 This is a three-dimensional view of a partial structure of the present invention.

[0020] Figure 3 This is a three-dimensional view of the leak-proof tube and the measuring body of this utility model.

[0021] Figure 4 This is a three-dimensional view of the leak-proof component and connecting pipe of this utility model.

[0022] Figure 5 This is a three-dimensional view of the anti-fouling component and connecting pipe of this utility model.

[0023] Figure 6 This is a three-dimensional view of the anti-fouling component of this utility model.

[0024] Figure 7 This is a three-dimensional view of the clamping component and the shock absorption component of this utility model.

[0025] Figure 8 This is a three-dimensional view of the adjustment component of this utility model.

[0026] Icons: Measurement body 1, base 11, adjustment cavity 111, fixing part 112, connecting pipe 2, measurement display part 3, display screen 31, mounting box 32, anti-debris component 4, anti-debris cover 41, inner ring 42, connecting rod 43, tension spring 44, connecting rod 45, limit plate 46, feeding pipe 6, anti-leakage component 7, anti-leakage pipe 71, first connecting ring 72, second connecting ring 73, flange 74, clamping component 8, clamping plate 81, telescopic part 82, clamping half hoop 83, vibration damping component 9, vibration damping longitudinal slider 91, vibration damping rod 92, vibration damping spring 93, vibration damping transverse slider 94, swing rod 95, horizontal vibration damping groove 96, fixing ear 97, adjustment component 10, adjustment plate 101, adjustment groove 102, adjustment block 103, servo motor 104, lead screw 105, guide bar 106. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example 1

[0028] like Figures 1-8 As shown, this utility model provides a digital precision pressure measuring device for liquid engine fuel flow rate, including a measuring body 1, a connecting pipe 2, a measuring display 3, and an anti-impurity component 4; the connecting pipe 2 extends horizontally through both sides of the measuring body 1; one end of the connecting pipe 2 is used for detachable connection to a feed pipe 6; the measuring display 3 is located on the upper side of the measuring body 1 and is used to measure the flow rate of liquid fuel flowing through the connecting pipe 2 and display the measurement data; the anti-impurity component 4 includes an anti-impurity cover 41, an anti-impurity frame, and a reset component; the anti-impurity frame is fixed inside the connecting pipe 2 and has a gap between it and the inner wall of the connecting pipe 2; one end of the reset component slides along the axial direction of the connecting pipe 2 through the anti-impurity frame and is used to drive the anti-impurity cover 41 to block the other end of the connecting pipe 2.

[0029] The principles and beneficial effects of the above technical solution: By horizontally inserting a connecting pipe 2 inside the measuring body 1, liquid engine fuel can flow stably through the measuring body 1 along the connecting pipe 2. The measuring display 3 is set on the upper side of the measuring body 1 to collect and display the flow data of liquid fuel in real time, thereby realizing precise measurement of engine fuel flow.

[0030] Meanwhile, an anti-impurity component 4 is installed at the end of the connecting pipe 2 that is not connected to the feeding pipe 6. When the device is in testing or calibration mode and one end of the connecting pipe 2 is open, the anti-impurity component 4 can automatically block the port, thereby preventing external impurities from directly entering the interior of the connecting pipe 2. This structure can achieve protection without manual intervention, effectively improving the reliability and safety of the digital precision pressure measuring device during testing and calibration.

[0031] In this embodiment, the anti-debris frame includes an inner ring 42 and multiple connecting rods 43; the inner ring 42 is coaxially disposed inside the connecting pipe 2; one end of the multiple connecting rods 43 is radially fixed to the outer periphery of the inner ring 42, and the other end is fixed to the inner sidewall of the connecting pipe 2.

[0032] The principles and beneficial effects of the above technical solution: By installing a debris-proof frame consisting of an inner ring 42 and multiple connecting rods 43 inside the connecting pipe 2, the debris-proof frame can be stably fixed to the inner wall of the connecting pipe 2, while a flow gap is formed between the debris-proof frame and the inner wall of the connecting pipe 2. When the feeding pipe 6 is normally connected and transporting liquid fuel, the fuel can smoothly pass through this gap into the measurement area without affecting normal measurement.

[0033] In this embodiment, the reset component includes a tension spring 44, a connecting rod 45, and a limiting plate 46; the connecting rod 45 slides through the inner ring 42; the limiting plate 46 is coaxially disposed at the end of the connecting rod 45 away from the anti-dirt cover 41, and the outer diameter of the limiting plate 46 is larger than the inner diameter of the inner ring 42; the other end of the connecting rod 45 is fixed to the anti-dirt cover 41; the tension spring 44 is sleeved on the connecting rod 45, and its two ends are respectively fixed to the limiting plate 46 and the inner ring 42.

[0034] The principles and beneficial effects of the above technical solution: By setting a reset component consisting of a tension spring 44, a connecting rod 45, and a limiting disc 46, the impurity cover 41 can automatically return to its original position and block the port of the connecting pipe 2 under the elastic action of the tension spring 44 when no external force is applied. When the feed pipe 6 connects with the connecting pipe 2 and pushes the impurity cover 41, the connecting rod 45 slides axially along the inner ring 42, the tension spring 44 is stretched, and the impurity cover 41 gives way to the liquid fuel passage.

[0035] After the measurement is completed, the tension spring 44 releases its elastic potential energy, driving the connecting rod 45 to automatically reset the anti-impurity cover 41, thereby resealing the port of the connecting tube 2. This structure enables the automatic opening and closing of the anti-impurity cover 41, avoiding omissions in manual operation, and further improving the anti-impurity stability and measurement reliability of the device during multiple tests and calibrations.

[0036] In this embodiment, a leak-proof component 7 is also included; the leak-proof component 7 includes a leak-proof pipe 71, two first connecting rings 72, and two second connecting rings 73; the two first connecting rings 72 are sleeved on both ends of the connecting pipe 2; the two second connecting rings 73 are coaxially fixed to the inner wall of the leak-proof pipe 71; the leak-proof pipe 71 is coaxially sleeved on the outside of the connecting pipe 2; the first connecting rings 2 and the second connecting rings 73 are fixedly connected by screws; the feed pipe 6 is detachably connected to the end of the leak-proof pipe 71 away from the anti-fouling cover 41 through a flange 74, so that the feed pipe 6 can transport liquid fuel into the connecting pipe 2; the measuring display component 3 includes a display screen 31 and a mounting box 32; the mounting box 32 is disposed through the top side of the measuring body 1; the detection end of the display screen 31 is disposed inside the mounting box 32, so that when liquid fuel passes through, the measuring body 1 can detect the flow rate of the liquid fuel, and thus display the measurement data on the surface of the display screen 31.

[0037] The principles and beneficial effects of the above technical solution: By coaxially installing a leak-proof pipe 71 on the outside of the connecting pipe 2 and using the first connecting ring 72 and the second connecting ring 73 to achieve screw fixation, the leak-proof pipe 71 and the connecting pipe 2 form a sealed covering structure. When the feed pipe 6 is connected to the leak-proof pipe 71 through the flange 74, the liquid fuel can be stably introduced into the interior of the connecting pipe 2, preventing leakage at the connection point.

[0038] Meanwhile, the measuring display 3 is fixed to the top of the measuring body 1 by the mounting box 32, so that the detection end of the display screen 31 is located inside the measuring body 1. When the liquid fuel flows through the connecting pipe 2, the measuring body 1 can accurately detect the flow rate and display the measurement data in real time, thereby improving the visualization and data reliability in the fuel flow test process. Example 2

[0039] like Figures 1-8 As shown, this embodiment, based on embodiment one, also includes a base 11 and clamping components 8 disposed on both sides of the feeding pipe 6; the clamping components 8 include a clamping plate 81, a telescopic member 82, and a clamping half hoop 83; the clamping plate 81 is vertically disposed on the base 11; the telescopic member 82 has a telescopic end that moves radially along the feeding pipe 6; the clamping half hoop 83 is fixed on the telescopic end; the telescopic member 82 is an electric cylinder.

[0040] The principles and beneficial effects of the above technical solution: By setting the clamping assembly 8 on the base 11, the feed pipe 6 can be stably limited by the clamping half-hoop 83 during the measurement process, reducing the shaking and displacement of the feed pipe 6 when operating on the test bench or under engine conditions. This allows the measuring device to maintain a stable connection between the feed pipe 6 and the measuring body 1 under vibration conditions, avoiding fluid state fluctuations caused by the shaking of the feed pipe 6, thus improving measurement stability from a structural perspective. The telescopic component 82 allows the clamping half-hoop 83 to move radially along the feed pipe 6, adapting to the clamping requirements of different specifications of feed pipe 6 and improving the versatility of the device.

[0041] In this embodiment, a vibration damping assembly 9 is provided on the clamping plate 81; the vibration damping assembly 9 includes a vibration damping longitudinal slider 91 and a buffer; a vertical vibration damping groove is formed on the clamping plate 81; the vibration damping longitudinal slider 91 is slidably disposed in the vertical vibration damping groove; a telescopic member 82 is horizontally fixed on the vibration damping longitudinal slider 91; the buffer is used to buffer the passive sliding of the vibration damping longitudinal slider 91; the buffer includes a vibration damping rod 92, a vibration damping spring 93, a vibration damping transverse slider 94, and a swing rod 95; a horizontal vibration damping groove 96 is formed on the clamping plate 81; the vibration damping rod 92 is horizontally disposed on the clamping plate 81. The vibration damping rod 92 is located outside the horizontal vibration damping groove 96; there are two vibration damping horizontal sliders 94, which are slidably sleeved on the vibration damping rod 92 and slidably connected to the horizontal vibration damping groove 96; the vibration damping spring 93 is sleeved on the vibration damping rod 92 and fixed to the two vibration damping horizontal sliders 94; there are two swing rods 95, and the two ends of each swing rod 95 are respectively hinged to the vibration damping horizontal slider 94 and the vibration damping vertical slider 91; there are two fixing ears 97 fixed on the clamping plate 81; the vibration damping rod 92 is fixed by the screw sliding through the fixing ears 97.

[0042] The principles and beneficial effects of the above technical solution: By setting a vibration damping assembly 9 on the clamping plate 81, consisting of a vibration damping longitudinal slider 91, a vibration damping transverse slider 94, a vibration damping spring 93, and a swing rod 95, the clamping assembly 8 can generate multi-directional buffer displacement under vibration conditions. When vertical or horizontal vibration occurs during the test, the vibration damping longitudinal slider 91 and the vibration damping transverse slider 94 passively slide within the vibration damping groove, and the vibration damping spring 93 absorbs the vibration energy.

[0043] The swing arm 95 provides correlation and stability to the vibration reduction process, thereby effectively reducing the transmission of vibration to the feed pipe 6 and the measuring body 1. It improves fluid flow stability without extending the length of the feed pipe 6, avoiding fluctuations or deviations in measurement data caused by vibration, and solves the problem of existing technologies relying on extended pipelines, which leads to structural complexity and reduced testing efficiency. Example 3

[0044] like Figures 1-8As shown, this embodiment, based on the above embodiment, further includes an adjustment cavity 111 disposed within the base 11; an adjustment assembly 10 is disposed within the adjustment cavity 111; the adjustment assembly 10 includes an adjustment plate 101 and a driving component; an adjustment groove 102 communicating with the adjustment cavity 111 is opened on the surface of the base 11; one end of the clamping plate 81 is fixed to the adjustment plate 101 by an adjustment block 103 slidably disposed within the adjustment groove 102; the driving component is used to drive the adjustment plate 101 to move axially along the connecting pipe 2, so as to drive the clamping plate 81 to slide within the adjustment groove 102; the driving component includes a servo motor 104 and a lead screw 105; the lead screw is threaded through the adjustment plate 101 and disposed within the adjustment cavity 111; the servo motor 104 is fixed to the outer side wall of the base 11, and the power end of the servo motor 104 rotates into the adjustment cavity 111 and is coaxially fixed with one end of the lead screw; the other end of the lead screw is rotatably connected to the inner side wall of the adjustment cavity 111 through a bearing.

[0045] The principles and beneficial effects of the above technical solution: By setting an adjustment cavity 111 within the base 11 and arranging an adjustment assembly 10 consisting of a servo motor 104 and a lead screw 105 within it, the clamping plate 81 can be precisely moved along the axial direction of the connecting pipe 2, thereby adjusting the installation position between the feeding pipe 6 and the measuring body 1. The servo motor 104 drives the lead screw 105 to rotate, and the lead screw 105 drives the adjustment plate 101 to move linearly, thus achieving synchronous movement of the clamping plate 81. This allows the device to flexibly adjust its installation position according to different testing environments and layout requirements, improving the adaptability and installation efficiency of the testing system. In this embodiment, a guide bar 106 is provided inside the adjustment cavity 111; a guide opening is provided on the adjustment plate 101; the adjustment plate 101 is slidably connected to the guide bar 106 through the guide opening.

[0046] The principles and beneficial effects of the above technical solution: By setting a guide bar 106 in the adjustment cavity 111 and opening a guide port on the adjustment plate 101 to cooperate with it, the adjustment plate 101 can slide smoothly in the predetermined direction during axial movement, thus avoiding deviation or jamming during the drive of the lead screw 105.

[0047] In this embodiment, four fasteners 112 are installed on the base 11; the fasteners 112 have fixing holes.

[0048] The principles and beneficial effects of the above technical solution: By creating a fixing hole on the surface of the fixing member 112, the base 11 can be more securely mounted on the workbench when the bolt is inserted into the surface of the fixing hole, thereby making the digital precision pressure measuring device more stable and giving it stability and adaptability.

[0049] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A digital precision pressure measurement device for fuel flow in a liquid engine, characterized in that, include: Measurement body; A connecting pipe extends horizontally through both sides of the measuring body; one end of the connecting pipe is used for detachable connection to a feeding pipe. A measuring display unit, located on the upper side of the measuring body, is used to measure the flow rate of liquid fuel flowing through the connecting pipe and display the measurement data; Anti-debris components, including anti-debris cover, anti-debris frame and reset component; The anti-debris frame is fixed inside the connecting pipe and has a gap between it and the inner wall of the connecting pipe; one end of the reset member slides through the anti-debris frame along the axial direction of the connecting pipe, and is used to drive the anti-debris cover to block the other end of the connecting pipe.

2. The digital precision pressure measurement device for fuel flow in a liquid engine according to claim 1, characterized in that: The anti-debris frame includes an inner ring and multiple connecting rods; the inner ring is coaxially disposed inside the connecting tube; one end of each of the multiple connecting rods is radially fixed to the outer periphery of the inner ring, and the other end is fixed to the inner wall of the connecting tube.

3. The digital precision pressure measurement device for fuel flow in a liquid engine according to claim 2, characterized in that: The reset component includes a tension spring, a connecting rod, and a limiting plate; the connecting rod slides through the inner ring; the limiting plate is coaxially disposed at the end of the connecting rod away from the anti-fouling cover, and the outer diameter of the limiting plate is larger than the inner diameter of the inner ring; the other end of the connecting rod is fixed to the anti-fouling cover; the tension spring is sleeved on the connecting rod, and its two ends are respectively fixed to the limiting plate and the inner ring.

4. The digital precision pressure measurement device for fuel flow in a liquid engine according to claim 1, characterized in that: It also includes a leak-proof component; the leak-proof component includes a leak-proof tube, two first connecting rings, and two second connecting rings; the two first connecting rings are sleeved on both ends of the connecting tube; the two second connecting rings are coaxially fixed to the inner wall of the leak-proof tube; the leak-proof tube is coaxially sleeved on the outside of the connecting tube; the first connecting rings and the second connecting rings are fixedly connected.

5. The digital precision pressure measurement device for fuel flow in a liquid engine according to claim 1, characterized in that: It also includes a base and clamping assemblies disposed on both sides of the feeding pipe; the clamping assemblies include clamping plates, telescopic members and clamping half-hoops; the clamping plates are vertically disposed on the base; the telescopic members have telescopic ends that move radially along the feeding pipe; the clamping half-hoops are fixed to the telescopic ends.

6. The digital precision pressure measurement device for fuel flow in a liquid engine according to claim 5, characterized in that: The clamping plate is provided with a vibration damping component; the vibration damping component includes a vibration damping longitudinal slider and a buffer; the clamping plate has a vertical vibration damping groove; the vibration damping longitudinal slider is slidably disposed in the vertical vibration damping groove; the telescopic component is horizontally fixed on the vibration damping longitudinal slider; the buffer is used to buffer the passive sliding of the vibration damping longitudinal slider.

7. A digital precision pressure measurement device for fuel flow in a liquid engine according to claim 6, characterized in that: The buffer includes a damping rod, a damping spring, a damping horizontal slider, and a swing rod; a horizontal damping groove is formed on the clamping plate; the damping rod is horizontally disposed on the clamping plate and located outside the horizontal damping groove; there are two damping horizontal sliders, which are slidably sleeved on the damping rod, and the damping horizontal sliders are slidably connected to the horizontal damping groove; the damping spring is sleeved on the damping rod and fixed to the two damping horizontal sliders; there are two swing rods, and the two ends of each swing rod are respectively hinged to the damping horizontal slider and the damping vertical slider.

8. The digital precision pressure measurement device for fuel flow in a liquid engine according to claim 7, characterized in that: The base has an adjustment cavity; the adjustment cavity has an adjustment assembly; the adjustment assembly includes an adjustment plate and a driving component; the surface of the base has an adjustment groove that communicates with the adjustment cavity; one end of the clamping plate is fixed to the adjustment plate through the adjustment groove; the driving component is used to drive the adjustment plate to move along the axial direction of the connecting pipe, so as to drive the clamping plate to slide along the adjustment groove.

9. A digital precision pressure measurement device for fuel flow in a liquid engine according to claim 8, characterized in that: The adjustment cavity is provided with a guide bar; the adjustment plate has a guide opening; the adjustment plate is slidably connected to the guide bar through the guide opening.

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