Pressure sensor

Abstract

The invention discloses a pressure sensor, and belongs to the technical field of pressure sensors. The pressure sensor comprises a frame body; the static pressure diaphragm capsule assembly is mounted on the frame body and is communicated with the static pressure pipeline of the pitot tube; the dynamic pressure diaphragm capsule assembly is mounted on the frame body and is communicated with a total pressure pipeline of the pitot tube; the potentiometer is mounted on the frame body; and the electric brush is rotatably mounted on the frame body by taking a straight line in the first direction as an axis, one end of the electric brush is attached to the potentiometer, and the other ends of the static pressure diaphragm capsule assembly and the dynamic pressure diaphragm capsule assembly are connected with one end, far away from the potentiometer, of the electric brush. Therefore, the same electric brush is driven by the static pressure diaphragm capsule assembly and the dynamic pressure diaphragm capsule assembly, the position of the electric brush on the potentiometer is changed, the pressure change is converted into the physical displacement of the electric brush, and then a resistance signal in direct proportion to the dynamic pressure and the static pressure is directly output by changing the resistance value of the potentiometer. Therefore, the probability of electromagnetic interference on the pressure sensor provided by the invention is smaller.

Description

Technical Field

[0001] This invention belongs to the field of pressure sensor technology, and specifically relates to a pressure sensor. Background Technology

[0002] When a jet aircraft flies at high subsonic speeds (Mach number > 0.7) at high altitudes, it approaches the speed of sound and encounters the effects of air compressibility. At this point, the aircraft's aerodynamic center (point of lift) shifts rearward, causing a natural pitching tendency and a decrease in elevator efficiency. To maintain level flight, the pilot needs to constantly pull back on the control stick, which is not only strenuous but also makes the aircraft's speed unstable: increasing airspeed leads to pitching down, further increasing airspeed; decreasing airspeed leads to pitching up, further decreasing airspeed, jeopardizing flight safety. To ensure aircraft safety and reduce pilot workload, aircraft are equipped with automatic lever arm adjustment devices to automatically compensate for this aerodynamic center shift and speed instability caused by high-speed flight.

[0003] The automatic lever arm adjustment device, also known as the Mach number trim system, measures the aircraft's Mach number. When the Mach number is too high, the system automatically drives the horizontal stabilizer to deflect downwards, generating a pitching moment. This effectively extends the starting lever arm, precisely counteracting the natural nose-down tendency caused by high altitude flight, thereby restoring aircraft stability, reducing pilot workload, and improving flight safety. The calculation of the Mach number relies entirely on the precise measurement of dynamic and static pressure.

[0004] On aircraft, dynamic and static pressure are typically calculated precisely using an atmospheric data system. However, this system, being a complex electronic system, is susceptible to malfunctions, electromagnetic interference, and signal interruptions or instability. Therefore, automatic lever arm adjustment devices generally employ separate sensors to measure total and static pressure. Typically, two pressure sensors are used simultaneously to measure both, and the data is then analyzed by a computer to obtain the Mach number, which in turn drives the lever arm for adjustment. However, this structure results in a more complex system with more accessories, a larger system size and weight, and the risk of electromagnetic interference remains. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a pressure sensor to solve the technical problem that existing Mach number balancing systems rely on independent sensors to measure total pressure and static pressure, which are susceptible to electromagnetic interference.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A pressure sensor, comprising: Frame; A static pressure diaphragm assembly is installed at the upper end of the frame, and one end of the static pressure diaphragm assembly is connected to the static pressure pipeline of the Pitot tube. A dynamic pressure diaphragm box assembly is installed at the lower end of the frame, and one end of the dynamic pressure diaphragm box assembly is connected to the total pressure pipeline of the Pitot tube; A potentiometer is mounted on the frame and located between the static pressure diaphragm assembly and the dynamic pressure diaphragm assembly; The brush is rotatably mounted on the frame with the straight line in the first direction as its axis, and one end is in contact with the potentiometer. The other ends of the static pressure diaphragm assembly and the dynamic pressure diaphragm assembly are both connected to the end of the brush away from the potentiometer. Both the static pressure diaphragm assembly and the dynamic pressure diaphragm assembly are used to drive the brush to rotate.

[0007] Furthermore, it also includes: A rotating shaft is rotatably mounted on the frame and arranged along the first direction. One end of the brush is fixedly mounted on the rotating shaft, and the axis of the brush is perpendicular to the straight line containing the first direction. The first connecting block has one end fixedly mounted on the rotating shaft and the other end extending away from the potentiometer; The first connecting rod has one end detachably mounted on the static pressure diaphragm assembly and the other end has an oblong hole. The first connecting block has a first mounting groove at the end away from the rotating shaft. The other end of the first connecting rod is slidably inserted into the first mounting groove and connected by a pin. The second connecting block has one end fixedly mounted on the rotating shaft, and the other end extends in the direction close to the potentiometer; The second connecting rod has one end detachably mounted on the dynamic pressure diaphragm assembly and the other end has a second oblong hole. The second connecting block has a second mounting groove at the end away from the rotating shaft. The other end of the second connecting rod is slidably inserted into the second mounting groove and connected by a pin.

[0008] Furthermore, it also includes: A first connecting seat is installed on the static pressure diaphragm assembly. The first connecting seat has a first connecting groove and a first through hole on its side wall. The first through hole communicates with the first connecting groove, and one end of the first connecting rod is installed in the first connecting groove. The first pin has a plurality of first round holes at one end of the first connecting rod near the first connecting seat. The plurality of first round holes are evenly arranged along the length of the first connecting rod. The first pin is inserted into the first through hole and any of the first round holes. The second connecting seat is installed on the dynamic pressure diaphragm box assembly. The second connecting seat has a second connecting groove. The side wall of the first connecting seat has a second through hole. The second through hole communicates with the second connecting groove. One end of the second connecting rod is installed in the second connecting groove. The second pin has multiple second round holes at one end of the second connecting rod near the second connecting seat. The multiple second round holes are evenly arranged along the length of the second connecting rod. The second pin is inserted into the second through hole and any of the second round holes.

[0009] Furthermore, it also includes: The mounting rod has one end fixedly mounted on the rotating shaft and the other end extending away from the potentiometer; The counterweights are multiple in number, and each of the multiple counterweights can be detachably installed on the end of the mounting rod away from the rotating shaft.

[0010] Furthermore, the hydrostatic diaphragm assembly includes: The first upper diaphragm is fixedly connected to the frame; The first lower diaphragm is fixedly connected to the first upper diaphragm and forms a first sealed cavity between the lower diaphragm and the first upper diaphragm. The first conduit has one end connected to the first sealed cavity and the other end connected to the static pressure line of the Pitot tube.

[0011] Furthermore, the dynamic pressure diaphragm assembly includes: The second lower diaphragm is fixedly installed on the frame; The second upper diaphragm is fixedly connected to the second lower diaphragm and forms a second sealed cavity with the second upper diaphragm; The second conduit is connected at one end to the second sealed cavity and at the other end to the total pressure line of the Pitot tube.

[0012] Furthermore, the first upper diaphragm, the first lower diaphragm, the second upper diaphragm, and the second lower diaphragm are all structural components made of beryllium bronze.

[0013] Further, the brush includes: Insulating sleeve; The brush arm is housed within the insulating sleeve; A brush body is disposed inside the brush arm, with one end of the brush body extending out of the brush arm and in contact with the potentiometer.

[0014] Furthermore, the potentiometer includes: The frame has two terminals on one side, which are connected to the positive and negative terminals of the power supply, respectively. A potentiometer is installed inside the frame, with its two pins connected to the two terminals via wires, and one end of the brush in contact with the potentiometer. Insulating paper is placed between the potentiometer and the frame.

[0015] Furthermore, it also includes an outer shell, which covers the frame body.

[0016] The pressure sensor provided by this invention has the following beneficial effects: 1. By driving the same brush through the static pressure diaphragm assembly and the dynamic pressure diaphragm assembly, the position of the brush on the potentiometer is changed, and the pressure change is converted into the physical displacement of the brush. Then, by changing the resistance value of the potentiometer, a resistance signal proportional to the dynamic and static pressure is directly output without the need for additional calculations. In this way, the pressure sensor provided by the present invention is less likely to be affected by electromagnetic interference. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the pressure sensor provided in an embodiment of the present invention. Figure 1 ; Figure 2 A schematic diagram of the structure of the pressure sensor provided in an embodiment of the present invention. Figure 2 ; Figure 3 A schematic diagram of the installation structure of the static pressure diaphragm assembly, the dynamic pressure diaphragm assembly, the potentiometer, and the brush provided in an embodiment of the present invention; Figure 4 A schematic diagram of the installation structure of the rotating shaft, the first connecting block, and the second connecting block provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the brush provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the potentiometer provided in an embodiment of the present invention.

[0018] The attached diagram shows the markings and corresponding component names: 1-Frame, 2-Static pressure diaphragm assembly, 21-First upper diaphragm, 22-First lower diaphragm, 23-First conduit, 3-Dynamic pressure diaphragm assembly, 31-Second upper diaphragm, 32-Second lower diaphragm, 33-Second conduit, 4-Potentigmeter, 41-Frame, 411-Terminal, 42-Potentigmeter, 43-Insulating paper, 5-Brush, 51-Insulating sleeve, 52-Brush arm, 53-Brush body, 6-Rotating shaft, 7-First connecting block, 8-First connecting rod, 81-Oval hole, 82-First round hole, 9-Second connecting block, 10-Second connecting rod, 101-Second round hole, 20-First connecting seat, 30-First pin, 40-Second connecting seat, 50-Second pin, 60-Mounting rod, 70-Counterweight, 80-Outer shell. Detailed Implementation

[0019] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0020] This embodiment provides a pressure sensor to address the technical problem in existing Mach number balancing systems that rely on independent sensors to measure total and static pressure, resulting in susceptibility to electromagnetic interference. The pressure sensor includes a frame 1, a static pressure diaphragm assembly 2, a dynamic pressure diaphragm assembly 3, a potentiometer 4, and a brush 5, wherein: refer to Figures 1-2 The frame 1 includes a base and a chamfered frame. The chamfered frame is installed on the top of the base, and the opening of the chamfered frame is set directly opposite the base.

[0021] The static pressure diaphragm assembly 2 is installed at the upper end of the frame 1, that is, the static pressure diaphragm assembly 2 is connected to the inner top wall of the U-shaped frame, and one end of the static pressure diaphragm assembly 2 is connected to the static pressure pipeline of the Pitot tube. When the static pressure diaphragm assembly 2 is on the ground, the external static pressure is high. The static pressure is transmitted into the static pressure diaphragm through the static pressure hole in the static pressure pipeline of the Pitot tube, squeezing the static pressure diaphragm from the outside, and the diaphragm is in a compressed state. When the aircraft ascends, as the altitude increases, the outside atmosphere becomes thinner, the static pressure decreases, and it is also transmitted into the static pressure diaphragm, and the diaphragm expands accordingly.

[0022] The dynamic pressure diaphragm assembly 3 is installed at the lower end of the frame 1. The base has a mounting cavity, and the dynamic pressure diaphragm assembly 3 is installed in the mounting cavity and is positioned opposite the static pressure diaphragm assembly 2. One end of the dynamic pressure diaphragm assembly 3 is connected to the total pressure pipeline of the Pitot tube. When the dynamic pressure diaphragm assembly 3 is on the ground, since there is no air flow, the total pressure is equal to the static pressure, that is, the total pressure inside the dynamic pressure diaphragm assembly 3 is equal to the static pressure outside the dynamic pressure diaphragm assembly 3, and there is no pressure difference between the inside and outside of the dynamic pressure diaphragm assembly 3. At this time, it is in a state of natural deformation. When the total pressure increases, the dynamic pressure diaphragm assembly 3 feels the pressure and expands.

[0023] Potentiometer 4 is mounted on frame 1. Specifically, potentiometer 4 is mounted vertically, meaning that the resistance of potentiometer 4 changes in the vertical direction, and it is located between static pressure diaphragm assembly 2 and dynamic pressure diaphragm assembly 3.

[0024] The brush 5 is rotatably mounted on the frame 1 with the straight line in the first direction as its axis, and one end is in contact with the potentiometer 4. The other ends of the static pressure diaphragm assembly 2 and the dynamic pressure diaphragm assembly 3 are both connected to the end of the brush 5 away from the potentiometer 4. Both the static pressure diaphragm assembly 2 and the dynamic pressure diaphragm assembly 3 are used to drive the brush 5 to rotate. In this way, through the connection of the static pressure diaphragm assembly 2 and the dynamic pressure diaphragm assembly 3 to the same brush 5, when the total pressure increases, the dynamic pressure diaphragm assembly 3 senses the pressure and expands, pushing the brush 5 to move on the potentiometer 4 in the direction of increasing resistance. When the aircraft altitude increases and the static pressure decreases, the static pressure diaphragm assembly 2 expands, pushing the brush 5 to move on the potentiometer 4 in the direction of increasing resistance. In this way, by changing the position of the brush 5 on the potentiometer 4, a resistance signal proportional to the dynamic and static pressure is output.

[0025] refer to Figure 3 and Figure 4 It also includes a rotating shaft 6, a first connecting block 7, a first connecting rod 8, a second connecting block 9, and a second connecting rod 10, wherein: The rotating shaft 6 is rotatably mounted on the frame 1 and arranged along the first direction. One end of the brush 5 is fixedly mounted on the rotating shaft 6, and the axis of the brush 5 is perpendicular to the straight line of the first direction. Specifically, the two inner sidewalls of the C-shaped frame are provided with grooves adapted to the rotating shaft 6, and the axes of the two grooves are on the same straight line. The two ends of the rotating shaft 6 are respectively rotatably installed in the two grooves. The rotating shaft 6 is also provided with a brush holder, which includes a square block and two elongated blocks. The square block has a groove adapted to the rotating shaft 6. The square block is fixedly connected to the rotating shaft 6 through the through hole. Two long blocks are fixedly installed on the top of the square block, and the two long blocks are arranged opposite each other and spaced apart. An arc-shaped groove adapted to the brush 5 is opened on the opposite side of the two long blocks. The brush 5 is inserted between the two long blocks and located at the two arc-shaped grooves. Threaded holes are opened on the upper part of the two long blocks. Bolts are screwed into the two threaded holes so that the two long blocks clamp the brush 5. In this way, the position of the brush 5 can be easily adjusted by setting the bolts.

[0026] Optionally, a bearing is provided in each of the two grooves, and the two ends of the rotating shaft 6 are respectively inserted into the corresponding bearings.

[0027] One end of the first connecting block 7 is fixedly mounted on the rotating shaft 6, and the other end extends away from the potentiometer 4. In this way, the first connecting block 7 facilitates the connection of the first connecting rod 8. Optionally, the shape of the first connecting block 7 is similar to that of the brush holder, which will not be described in detail here.

[0028] One end of the first connecting rod 8 is detachably mounted on the static pressure diaphragm assembly 2, and the other end has a first oblong hole 81. The end of the first connecting block 7 away from the rotating shaft 6 has a first mounting groove. The other end of the first connecting rod is slidably inserted into the first mounting groove and connected by a pin. Specifically, pin holes are provided on both sides of the first mounting groove. One end of the pin passes through the two pin holes and the first oblong hole 81 to connect the first connecting rod 8 and the first connecting block 7 together. In this way, the setting of the first oblong hole 81 facilitates the adjustment of the timing of the static pressure diaphragm assembly 2 participating in the resistance output regulation. That is, before the aircraft reaches the required altitude, the output of the resistance signal is only affected by the dynamic pressure diaphragm assembly 3. After reaching the required altitude, the expansion of the static pressure diaphragm assembly 2 begins to drive the rotating shaft 6 to rotate, that is, to drive the brush 5 to rotate, so as to realize the comprehensive measurement and output of total pressure and static pressure to meet the adjustment needs of the automatic lever arm device. At the same time, adjusting the length of the first oblong hole 81 can change the pressure of the static pressure diaphragm assembly 2 participating in the resistance signal output regulation, that is, the aircraft altitude.

[0029] One end of the second connecting block 9 is fixedly mounted on the rotating shaft 6, and the other end extends towards the potentiometer 4. In this way, the second connecting block 9 facilitates the connection of the second connecting rod 10. Optionally, the shape of the second connecting block 9 is similar to that of the brush holder, which will not be described in detail here.

[0030] The two ends of the second connecting rod 10 are detachably mounted on the dynamic pressure diaphragm assembly 3 and the second connecting block 9, respectively. In this way, the displacement of the dynamic pressure diaphragm assembly 3 can be transmitted to the brush 5 through the setting of the second connecting rod 10.

[0031] It also includes a first connecting seat 20, a first pin 30, a second connecting seat 40, and a second pin 50, wherein: The first connecting seat 20 is installed on the static pressure diaphragm assembly 2. The first connecting seat 20 has a first connecting groove and a first through hole on its side wall. The first through hole communicates with the first connecting groove. One end of the first connecting rod 8 is rotatably installed in the first connecting groove. Optionally, a bimetallic strip is provided between the first connecting seat 20 and the static pressure diaphragm assembly 2. The bimetallic strip is made of two metals: a common steel layer and an Invar steel layer. The two metal layers have different coefficients of thermal expansion when the temperature changes, which causes deformation and thus plays a role in temperature compensation and improving high and low temperature output.

[0032] The first connecting rod 8 has multiple first circular holes 82 at one end near the first connecting seat 20. The multiple first circular holes 82 are evenly arranged along the length of the first connecting rod 8. The first pin 30 is inserted into the first through hole and any of the first circular holes 82. In this way, the first connecting seat 20 and the first connecting rod 8 connected by the first pin 30 are easier to disassemble and adjust. The multiple first circular holes 82 make the length of the first connecting rod 8 adjustable, so as to achieve rapid adjustment of product performance.

[0033] The second connecting seat 40 is mounted on the dynamic pressure diaphragm assembly 3. The second connecting seat 40 has a second connecting groove. The side wall of the first connecting seat 20 has a second through hole, which communicates with the connecting groove. One end of the second connecting rod 10 is rotatably mounted in the second connecting groove. Optionally, a bimetallic strip is provided between the second connecting seat 40 and the dynamic pressure diaphragm assembly 3. The second connecting rod 10 has multiple second circular holes 101 at one end near the second connecting seat 40. The multiple second circular holes 101 are evenly arranged along the length of the second connecting rod 10. The second pin 50 is inserted into the second through hole and any of the second circular holes 101. In this way, the second connecting seat 40 and the second connecting rod 10 connected by the first and second pins are easier to disassemble, assemble and debug. The setting of multiple second circular holes 101 makes the length of the second connecting rod 10 adjustable, so as to realize the rapid debugging of product performance.

[0034] It also includes a mounting rod 60 and a counterweight 70, wherein: One end of the mounting rod 60 is fixedly mounted on the rotating shaft 6, and the other end extends away from the potentiometer 4. Optionally, the mounting rod 60 can be bolted to the rotating shaft 6, making it easier to install and remove the mounting rod 60.

[0035] There are multiple counterweights 70, and all counterweights 70 can be detachably installed on the end of the mounting rod 60 away from the rotating shaft 6. Optionally, the end of the mounting rod 60 away from the rotating shaft 6 is provided with an external thread, and the center of the counterweight 70 is provided with a connecting hole adapted to the mounting rod 60. The connecting hole is provided with an internal thread adapted to the external thread. The counterweight 70 is screwed onto the mounting rod 60. In this way, it is easy to balance the center of gravity of the brush 5 by adjusting its engagement depth and increasing or decreasing its number.

[0036] The static pressure diaphragm assembly 2 includes a first upper diaphragm 21, a first lower diaphragm 22, and a first conduit 23, wherein: The first upper diaphragm 21 is fixedly connected to the frame 1, that is, the first upper diaphragm 21 is fixedly connected to the inner top wall of the C-shaped frame.

[0037] The first lower diaphragm 22 is fixedly connected to the first upper diaphragm 21 and forms a first sealed cavity between them. Optionally, the first upper diaphragm 21 and the first lower diaphragm 22 are sealed together by fusion welding.

[0038] One end of the first conduit 23 is connected to the first sealed cavity, and the other end is connected to the static pressure line of the Pitot tube. In this way, the static pressure received by the static pressure line of the Pitot tube is easily transmitted to the first sealed cavity. Under normal pressure, the first upper diaphragm 21 and the first lower diaphragm 22 are in a concave shape. When the height increases and the ambient pressure decreases, the pressure difference between the inside and outside of the diaphragm box decreases, and the diaphragm expands outward and bulges, outputting a displacement signal that is inversely proportional to the pressure.

[0039] The dynamic pressure diaphragm assembly 3 includes a second upper diaphragm 31, a second lower diaphragm 32, and a second conduit 33, wherein: The second lower diaphragm 32 is fixedly installed on the frame 1, that is, the second lower diaphragm 32 is fixedly installed on the inner bottom wall of the mounting cavity.

[0040] The second upper diaphragm 31 is fixedly connected to the second lower diaphragm 32, and a second sealed cavity is formed between the second upper diaphragm 31 and the second lower diaphragm 32. Optionally, the first upper diaphragm 21 and the first lower diaphragm 22 are sealed together by fusion welding.

[0041] One end of the second conduit 33 is connected to the second sealed cavity, and the other end is connected to the total pressure line of the Pitot tube. In this way, the pressure received by the total pressure line of the Pitot tube is transmitted to the second sealed cavity through the second conduit 33. The second upper diaphragm 31 and the second lower diaphragm 32 expand under pressure and move upward to output a displacement signal proportional to the pressure.

[0042] Optionally, the first upper diaphragm 21, the first lower diaphragm 22, the second upper diaphragm 31, and the second lower diaphragm 32 are all structural components made of beryllium bronze. Specifically, the first upper diaphragm 21 and the first lower diaphragm 22 are both stamped from QBe1.9 C0.15 material. By designing and controlling the diaphragm thickness, waveform, and heat treatment hardness, a three-wave structure that gradually decreases from the edge to the center of the diaphragm is designed, which can significantly improve the linearity of the diaphragm box, making the displacement change of the diaphragm box within 0-1.5mm in the absolute pressure range of 90mmHg-450mmHg, and the pressure-displacement output linearity within ±3%. The second upper diaphragm 31 and the second lower diaphragm 32 are both made of QBe1.9 The C0.2 material is stamped and formed. By designing and controlling the thickness, waveform and heat treatment hardness of the second upper diaphragm 31 and the second lower diaphragm 32, the design of three waveform structures that gradually decrease from the edge to the center of the diaphragm can make the displacement of the diaphragm box change to 0-1.5mm within the pressure range of 0-0.6kgf / cm2, and the pressure-displacement output linearity is within ±3%.

[0043] refer to Figure 5 The brush 5 includes an insulating sleeve 51, a brush arm 52, and a brush body 53, wherein: The insulating sleeve 51 is a structural component made of insulating material. The installation of the insulating sleeve 51 prevents current leakage.

[0044] The brush arm 52 is housed inside the insulating sleeve 51.

[0045] The brush body 53 is disposed inside the brush arm 52, and one end of the brush body 53 extends out of the brush arm 52 and is in contact with the potentiometer 4. Through the soft contact between the brush body 53 and the potentiometer 4, the probability of wear on the brush 5 and the potentiometer 4 is reduced.

[0046] refer to Figure 6 The potentiometer 4 includes a frame 41, a potentiometer 42, and insulating paper 43, wherein: The frame 41 has two terminals 411 on one side, which are connected to the positive and negative terminals of the power supply through wires respectively. The frame 41 is a structural component made of metal.

[0047] The potentiometer 42 is installed inside the frame 41. Specifically, a potential groove adapted to the potentiometer 42 is provided on one side of the frame 41. The potentiometer 42 is embedded in the potential groove, and the two pins of the potentiometer 42 are connected to two terminals 411 by wires respectively. One end of the brush 5 is in contact with the potentiometer 42.

[0048] Insulating paper 43 is placed between potentiometer 42 and frame 41 to prevent current from being conducted to frame 41.

[0049] It also includes a housing 80, which covers the frame 1. Optionally, the housing 80 is a hollow cylinder without a bottom. The housing 80 is connected to the base of the frame 1 by screws. Optionally, the housing 80 is a structural component made of metal material to improve electromagnetic compatibility.

[0050] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A pressure sensor, characterized in that, include: Frame (1); A static pressure diaphragm assembly (2) is installed at the upper end of the frame (1), and one end of the static pressure diaphragm assembly (2) is connected to the static pressure pipeline of the Pitot tube. A dynamic pressure diaphragm assembly (3) is installed at the lower end of the frame (1), and one end of the dynamic pressure diaphragm assembly (3) is connected to the total pressure pipeline of the Pitot tube; Potentiometer (4) is mounted on the frame (1) and located between the static pressure diaphragm assembly (2) and the dynamic pressure diaphragm assembly (3); The brush (5) can be rotatably mounted on the frame (1) with the straight line in the first direction as the axis, and one end is in contact with the potentiometer (4). The other ends of the static pressure diaphragm assembly (2) and the dynamic pressure diaphragm assembly (3) are both connected to the end of the brush (5) away from the potentiometer (4). The static pressure diaphragm assembly (2) and the dynamic pressure diaphragm assembly (3) are both used to drive the brush (5) to rotate.

2. The pressure sensor according to claim 1, characterized in that, Also includes: A rotating shaft (6) is rotatably mounted on the frame (1) and arranged along the first direction. One end of the brush (5) is fixedly mounted on the rotating shaft (6), and the axis of the brush (5) is perpendicular to the straight line in the first direction. The first connecting block (7) is fixedly mounted on the rotating shaft (6) at one end and extends away from the potentiometer (4) at the other end. The first connecting rod (8) has one end detachably mounted on the static pressure diaphragm assembly (2) and the other end has a waist-shaped hole (81). The first connecting block (7) has a first mounting groove at the end away from the rotating shaft (6). The other end of the first connecting rod (8) is slidably inserted into the first mounting groove and connected by a pin. The second connecting block (9) is fixedly mounted on the rotating shaft (6) at one end and extends towards the potentiometer (4) at the other end. The second connecting rod (10) is detachably mounted at both ends on the dynamic pressure diaphragm assembly (3) and the second connecting block (9).

3. The pressure sensor according to claim 2, characterized in that, Also includes: The first connecting seat (20) is installed on the static pressure diaphragm assembly (2). The first connecting seat (20) has a first connecting groove and a first through hole on its side wall. The first through hole communicates with the first connecting groove. One end of the first connecting rod (8) is installed in the first connecting groove. The first pin (30) has a plurality of first round holes (82) at one end of the first connecting rod (8) near the first connecting seat (20). The plurality of first round holes (82) are evenly arranged along the length direction of the first connecting rod (8). The first pin (30) is inserted into the first through hole and any of the first round holes (82). The second connecting seat (40) is installed on the dynamic pressure diaphragm box assembly (3). The second connecting seat (40) has a second connecting groove. The side wall of the first connecting seat (20) has a second through hole. The second through hole communicates with the second connecting groove. One end of the second connecting rod (10) is installed in the second connecting groove. The second pin (50) has a plurality of second round holes (101) at one end of the second connecting rod (10) near the second connecting seat (40). The plurality of second round holes (101) are evenly arranged along the length direction of the second connecting rod (10). The second pin (50) is inserted into the second through hole and any of the second round holes (101).

4. The pressure sensor according to claim 3, characterized in that, Also includes: The mounting rod (60) is fixedly mounted on the rotating shaft (6) at one end and extends away from the potentiometer (4) at the other end. There are multiple counterweights (70), and each of the multiple counterweights (70) can be detachably installed on the end of the mounting rod (60) away from the rotating shaft (6).

5. The pressure sensor according to claim 1, characterized in that, The static pressure diaphragm assembly (2) includes: The first upper diaphragm (21) is fixedly connected to the frame (1); The first lower diaphragm (22) is fixedly connected to the first upper diaphragm (21) and forms a first sealed cavity between the lower diaphragm (21); The first conduit (23) is connected at one end to the first sealed cavity and at the other end to the static pressure pipeline of the Pitot tube.

6. The pressure sensor according to claim 5, characterized in that, The dynamic pressure diaphragm assembly (3) includes: The second lower diaphragm (32) is fixedly installed on the frame (1); The second upper diaphragm (31) is fixedly connected to the second lower diaphragm (32) and forms a second sealed cavity between the upper diaphragm (31); The second conduit (33) is connected at one end to the second sealed cavity and at the other end to the total pressure line of the Pitot tube.

7. The pressure sensor according to claim 6, characterized in that, The first upper diaphragm (21), the first lower diaphragm (22), the second upper diaphragm (31), and the second lower diaphragm (32) are all structural components made of beryllium bronze.

8. The pressure sensor according to claim 1, characterized in that, The brush (5) includes: Insulating sleeve (51); The brush arm (52) is disposed inside the insulating sleeve (51); A brush body (53) is disposed inside the brush arm (52), and one end of the brush body (53) extends out of the brush arm (52) and is in contact with the potentiometer (4).

9. The pressure sensor according to claim 1, characterized in that, The potentiometer (4) includes: The frame (41) has two terminals (411) on one side, which are connected to the positive and negative terminals of the power supply respectively; A potentiometer (42) is installed inside the frame (41). The two pins of the potentiometer (42) are connected to the two terminals (411) respectively by wires. One end of the brush (5) is in contact with the potentiometer (42). Insulating paper (43) is disposed between the potentiometer (42) and the frame (41).

10. The pressure sensor according to any one of claims 1-9, characterized in that, It also includes an outer shell (80) that covers the frame (1).

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