A temperature and pressure sensitive component

Abstract

The present invention discloses a temperature and pressure sensitive component, comprising a frame arranged in a stepped hole of an adapter support, a platinum resistance wire wound on the frame, two leads with one end connected to the two ends of the platinum resistance wire respectively, and the other end used to connect to the output wire, two lead fixing holes provided on the adapter support and the mounting base, the two leads sequentially passing through the adapter support and the mounting base and fixed in the lead fixing holes, a pressure lead tube coaxial with the frame, one end of the pressure lead tube provided in the central hole of the mounting base, and the other end of the pressure lead tube used to connect to the pressure sensor; one end of the mounting base is welded to the adapter support, and the other end of the mounting base is provided with a mounting claw, each of which has a mounting hole. By installing the temperature and pressure sensitive component in the housing of a direct-through total temperature sensor, the direct-through total temperature sensor can measure the total atmospheric temperature and total pressure parameters during flight.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a temperature and pressure sensitive component. Background Art

[0002] Total temperature and total pressure parameters are of great significance to aircraft flight control and weapon launch. These parameters are generally measured using total temperature sensors and total pressure sensors (or pitot tubes). The total temperature sensor measures temperature using an internal temperature-sensitive element, while the total pressure sensor collects total pressure through an internal total pressure chamber. The internal temperature-sensitive component of existing total temperature sensors is generally a double-layer metal tubular structure. An insulation layer is prefabricated on the tubular metal skeleton, and a temperature-sensitive wire is wound around the outer surface of the skeleton. An insulation layer is prefabricated on the inner wall of the outer metal tube, which is then sleeved onto the skeleton, sealing the sensitive wire between the double-layer metal tubes. The sensitive component's structural process is complex, placing high demands on the insulation layer of the metal tube. The insulation layer is susceptible to temperature and external stress, making it prone to non-insulation problems. Furthermore, the temperature-sensitive component has a single function. Total pressure is measured through the total pressure chamber or pressure lead pipe inside the total pressure sensor, and its function is single. For small aircraft such as drones, miniaturized sensor products and multi-parameter measurement functions are usually required. Generally, total temperature sensors or total pressure sensors cannot have both functions. Summary of the Invention

[0003] An embodiment of the present invention provides a temperature and pressure sensitive component to solve the problem in the prior art that total temperature sensors or total pressure sensors cannot achieve both product miniaturization and multi-parameter measurement.

[0004] An embodiment of the present invention provides a temperature and pressure sensitive component, including a frame having an entire outer cylindrical surface coated with a glass insulation layer, the frame being arranged in a stepped hole of an adapter support, a platinum resistance wire being wound on the frame, the wire winding section of the frame being encapsulated using a glass encapsulation process, the contact portion between the platinum resistance wire joint and the frame being fixed with a glass encapsulation process, two leads having one end connected to the two ends of the platinum resistance wire respectively, and the other end being used to connect to the output wire, two lead fixing holes being provided on the adapter support and the mounting base, the two leads passing through the adapter support and the mounting base in turn and being fixed on the lead fixing holes, a pressure lead tube being coaxial with the frame, one end of the pressure lead tube being provided in the center hole of the mounting base, and the other end of the pressure lead tube being used to connect to the pressure sensor; one end of the mounting base being welded to the adapter support, and the other end of the mounting base being provided with a mounting claw, and the mounting claw being provided with a mounting hole.

[0005] As a preferred embodiment of the present invention, the connecting portion between the frame and the transfer support is connected and fixed by a glass encapsulation process, and the rest of the stepped hole of the transfer support except the portion in contact with the frame is connected and fixed by a glass encapsulation process.

[0006] As a preferred embodiment of the present invention, the skeleton is a thin-walled tubular structure with a wall thickness of 0.4 mm.

[0007] As a preferred embodiment of the present invention, the entire outer cylindrical surface of the skeleton is coated with a glass insulating layer.

[0008] As a preferred embodiment of the present invention, the thickness of the glass insulating layer is 0.3 mm.

[0009] As a preferred embodiment of the present invention, the pressure-inducing tube is a stainless steel capillary tube.

[0010] As a preferred embodiment of the present invention, the interior of the lead wire is a platinum wire with a diameter of 0.3 mm, and the exterior is composed of a porcelain tube and a metal sleeve.

[0011] As a preferred embodiment of the present invention, there is one central hole.

[0012] As a preferred embodiment of the present invention, four exhaust holes are provided.

[0013] As a preferred embodiment of the present invention, three mounting claws are provided.

[0014] An embodiment of the present invention provides a temperature and pressure sensitive component that can simultaneously measure total temperature and total pressure, has a simple process structure, and has the advantages of good electrical insulation performance, strong corrosion resistance, and better dynamic response performance. The temperature and pressure sensitive component can be installed in the housing of a straight-through total temperature sensor, and can simultaneously measure total temperature and total pressure, thereby miniaturizing the total temperature sensor and combining its functions. The present invention measures temperature by directly winding a temperature sensitive wire on a thin-walled beryllium oxide ceramic tube and encapsulating and fixing it using a glass sintering process. Because beryllium oxide ceramic has excellent insulation properties, the insulation between the sensitive wire and the skeleton is structurally guaranteed, eliminating the process of prefabricating an insulation layer on the skeleton and simplifying the process. In addition, beryllium oxide ceramic has high thermal conductivity. Compared with a double-layer metal tube sealing structure, the sensitive component with a single-layer structure has better dynamic response performance. The present invention realizes the total pressure acquisition function by designing a pressure lead tube in the middle of the sensitive component, so that the temperature and pressure sensitive component can achieve the total temperature and total pressure measurement functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A structural diagram of the temperature and pressure sensitive component provided in an embodiment of the present invention;

[0017] Figure 2 A partial enlarged view of a temperature and pressure sensitive component provided in an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the installation and application of the temperature and pressure sensitive components provided in an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the airflow direction of a temperature and pressure sensitive component provided in an embodiment of the present invention;

[0020] In the figure, 1. Skeleton, 2. Platinum resistance wire, 3. Pressure tube, 4. Lead, 5. Adapter bracket, 6. Mounting seat, 7. Center hole, 8. Lead fixing hole, 9. Exhaust hole, 10. Mounting three claws, 11. Mounting hole, 12. Platinum resistance wire joint and skeleton sintering part. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0023] Temperature and pressure sensitive components, such as Figure 1-2As shown, the entire outer cylindrical surface of the skeleton 1 is coated with a glass insulating layer, the skeleton 1 is arranged in the step hole of the transfer support 5, the connection part between the skeleton 1 and the transfer support 5 is connected and fixed by a glass packaging process, and the rest of the step hole of the transfer support 5 except the contact part with the skeleton 1 is connected and fixed by a glass packaging process, the platinum resistance wire 2 is wound on the skeleton 1, the wire winding section of the skeleton 1 is encapsulated by a glass packaging process, and the contact part between the joint of the platinum resistance wire 2 and the skeleton 1 is fixed by a glass packaging process. The platinum resistance wire joint and the skeleton sintering part 12 are fixed by a glass packaging process. One end of the lead wire 4 is respectively connected to the two ends of the platinum resistance wire 2, and the other end is used to connect the output wire. Two lead fixing holes 8 are set on the adapter support 5 and the mounting base 6. The two lead wires 4 pass through the adapter support 5 and the mounting base 6 in turn and are fixed on the lead fixing holes 8. The pressure tube 3 is coaxial with the skeleton 1. One end of the pressure tube 3 is arranged in the center hole 7 of the mounting base 6, and the other end of the pressure tube 3 is used to connect the pressure sensor; one end of the mounting base 6 is welded to the adapter support 5, and the other end of the mounting base 6 is provided with a mounting claw 10, and the mounting claw 10 is provided with a mounting hole 11.

[0024] The skeleton 1 is a thin-walled tubular structure with a wall thickness of 0.4 mm, which is made by grinding a beryllium oxide porcelain tube with good thermal conductivity and insulation properties.

[0025] The entire outer cylindrical surface of the frame 1 is coated with a glass insulation layer, and the thickness of the glass insulation layer is 0.3 mm.

[0026] The pressure-inducing tube 3 is a stainless steel capillary tube, one end of which is located inside the frame 1 and is coaxial with the frame 1, and the other end is connected to the pressure sensor. The pressure-inducing tube 3 has a certain degree of flexibility and can be bent.

[0027] The inside of the lead wire 4 is a platinum wire with a diameter of 0.3 mm, and the outside is composed of a porcelain tube and a metal sleeve.

[0028] The adapter support 5 and mounting base 6 are separate components, featuring a plug-in mounting structure with a 2mm insertion depth, ensuring excellent weld strength and processability. The adapter support 5 and mounting base 6 are made of corrosion-resistant 316L stainless steel, and the illustrated portion is laser welded together. The left end of the adapter support 5 is used to mount the frame 1 and lead wires 4. Exhaust holes 9 are provided on the sidewall of the middle portion of the adapter support 5 to allow airflow through the inner hole of the frame 1. One end of the mounting base 6 is welded to the adapter support 5, and the other end of the mounting base 6 is provided with a mounting prong 10, which is provided with a mounting hole 11.

[0029] There is one center hole 7;

[0030] There are four exhaust holes 9, which are evenly distributed on the adapter support 5. The four exhaust holes allow the air inside the cavity to be discharged quickly and evenly.

[0031] There are three mounting claws 10 .

[0032] Wind the platinum resistance wire 2 evenly around the bobbin 1 according to the resistance value requirements and temporarily secure it with high-temperature glue. Apply glass paste evenly to the winding section of the bobbin 1, ensuring that the glass paste completely covers the platinum resistance wire 2. After drying at room temperature, place it in a high-temperature furnace for sintering and fixation.

[0033] The platinum resistance wire joint and the skeleton sintering portion 12 are naturally formed by sintering and fixing the high-temperature glass powder.

[0034] Install the wire-wound bobbin 1 into the stepped hole of the adapter support 5. Install the two lead wires 4 into the lead-wire fixing holes 8 of the adapter support 5. Sinter the adapter support 5 with high-temperature glass powder at the illustrated location. After sintering, install the pressure-inducing tube 3 into the center hole 7 of the mounting base 6. Install the two lead wires 4 into the lead-wire fixing holes 8. Install the adapter support 5 onto the mounting base 6. Laser weld the joints.

[0035] The pressure-inducing tube 3 and the mounting seat 6 are connected by brazing.

[0036] The temperature and pressure sensitive components are designed to achieve temperature and pressure measurement simultaneously by combining functions. The temperature and pressure sensitive components are installed in the shell of the straight-through total temperature sensor. Figure 3 As shown, the direct-through total temperature sensor can measure the total atmospheric temperature and total pressure parameters during flight.

[0037] The three-claw 10 is installed with the straight-through total temperature sensor housing through 3 cylindrical head screws, such as Figure 3 When the temperature and pressure sensitive components are installed inside the total temperature sensor housing, the skeleton axis is facing the incoming flow direction, and the high-speed airflow flows through the inner cavity and outer surface of the skeleton 1. The internal airflow is discharged from the four exhaust holes 9 of the adapter support 5, as shown. Figure 4 As shown in the figure, during airflow, the air exchanges heat with the platinum resistance wire through convection, radiation, and conduction. The resistance output by the platinum resistance wire 2 varies linearly with temperature. This resistance is transmitted via a signal cable to the backend device, which converts the resistance value to calculate the temperature. When the high-speed airflow flows through the pressure-inducing tube 3 inside the skeleton 1, the airflow velocity drops to zero at the top of the pressure-inducing tube 3 because the other end of the pressure-inducing tube 3 is connected to the pressure sensor and is in a closed state. The kinetic energy of the airflow is converted into total pressure and transmitted through the pipeline to the backend pressure sensor.

[0038] The temperature and pressure sensitive component adopts a total temperature and total pressure combined pneumatic structure. The total temperature and total pressure measurement is achieved by arranging a pressure pipe 3 inside the temperature and pressure sensitive component and winding a platinum resistance wire 2 on the skeleton 1. The present invention adopts a glass packaging method to achieve the fixation of the non-metallic skeleton 1 and the metal transfer support 5, so that the temperature and pressure sensitive component has better insulation performance. The 316L stainless steel, sealing glass, platinum wire, platinum lead and other materials selected by the present invention are all corrosion-resistant materials, which makes the temperature and pressure sensitive component have better corrosion resistance. The glass sealing part can play a good heat insulation role, preventing the heat on the skeleton 1 from dissipating to the transfer support 5, making the temperature measurement more accurate. The platinum resistance wire 2 is directly wound on the non-metallic skeleton 1 and is sintered and packaged under high temperature conditions through glass slurry. The high-speed airflow can better exchange heat with the platinum resistance wire 2, so that the temperature and pressure sensitive component has better dynamic response performance. The advantage of the present invention is that the process structure is simple, and the total temperature and total pressure measurement function is realized at the same time. It has the advantages of good electrical insulation performance and strong corrosion resistance.

[0039] It should be noted that, for the sake of simplicity, the embodiments of the above method are described as a series of actions. However, those skilled in the art should be aware that the present invention is not limited to the order of the actions described. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are preferred embodiments, and the actions involved are not necessarily required by the present invention.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A temperature and pressure sensitive component, characterized in that: The invention comprises a frame (1) whose entire outer cylindrical surface is coated with a glass insulating layer, the frame (1) is arranged in a stepped hole of a transfer support (5), a platinum resistance wire (2) is wound on the frame (1), the wire winding section of the frame (1) is encapsulated by a glass encapsulation process, the contact portion between the joint of the platinum resistance wire (2) and the frame (1) is fixed by a glass encapsulation process, the platinum resistance wire joint and the frame sintering part (12) are fixed by a glass encapsulation process, one end of two lead wires (4) are respectively connected to the two ends of the platinum resistance wire (2), and the other end is used to connect the output wire, two lead fixing holes (8) are provided on the transfer support (5) and the mounting base (6), and the two lead wires (4) pass through the transfer support (5) and the mounting base (6) in sequence. The support (5) and the mounting base (6) are connected and fixed on the lead fixing hole (8). The left end of the adapter support (5) is used to install the frame (1) and the lead (4). An exhaust hole (9) is set on the side wall of the middle part of the adapter support (5). The pressure-inducing pipe (3) is coaxial with the frame (1). The pressure-inducing pipe (3) is located in the middle of the frame (1). One end of the pressure-inducing pipe (3) is set in the center hole (7) of the mounting base (6). The other end of the pressure-inducing pipe (3) is used to connect the pressure sensor; one end of the mounting base (6) is welded to the adapter support (5), and the other end of the mounting base (6) is provided with a mounting claw (10), and the mounting claw (10) is provided with a mounting hole (11).

2. A temperature and pressure sensitive component according to claim 1, characterized in that: The connecting portion between the frame (1) and the transfer support (5) is connected and fixed by using a glass encapsulation process, and the rest of the step hole of the transfer support (5) except for the portion in contact with the frame (1) is connected and fixed by using a glass encapsulation process.

3. A temperature and pressure sensitive component according to claim 1, characterized in that: The skeleton (1) is a thin-walled tubular structure with a wall thickness of 0.4 mm.

4. A temperature and pressure sensitive component according to claim 1, characterized in that: The entire outer cylindrical surface of the skeleton (1) is coated with a glass insulation layer.

5. A temperature and pressure sensitive component according to claim 4, characterized in that: The thickness of the glass insulation layer is 0.3 mm.

6. A temperature and pressure sensitive component according to claim 1, characterized in that: The pressure-inducing tube (3) is a stainless steel capillary tube.

7. The temperature and pressure sensitive component according to claim 1, characterized in that: The lead wire (4) is internally made of a platinum wire with a diameter of 0.3 mm, and externally made of a porcelain tube and a metal sleeve.

8. The temperature and pressure sensitive component according to claim 1, characterized in that: One central hole (7) is provided.

9. The temperature and pressure sensitive component according to claim 1, characterized in that: The exhaust holes (9) are provided with four.

10. The temperature and pressure sensitive component according to claim 1, characterized in that: The three mounting claws (10) are provided with three.

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