A stable silicon carbide pressure sensor

Abstract

The present application relates to a kind of stable silicon carbide pressure sensor, including cover and protection cylinder;The protection cylinder is in the upper opening position of cover, the part of cover and protection cylinder is mutually arranged with the side of inclined angle, the inclined side of protection cylinder is reserved with annular groove one, the side of cover towards protection cylinder is arranged with butt seat one, the butt seat two is arranged in the protection cylinder, the butt seat one is embeddedly connected with butt seat two, the inclined side of cover is arranged with O-ring one, O-ring one corresponds with annular groove one.This silicon carbide pressure sensor is blocked by O-ring two and O-ring three for protection cylinder and butt seat one, form continuous closed interface between butt seat one and locking piece, protection cylinder, effectively block outside water vapor, dust and other pollutants invade sensor inside, guarantee the long-term stability and measurement accuracy of silicon carbide pressure sensor.

Description

Technical Field

[0001] This invention belongs to the field of silicon carbide pressure sensor technology, specifically a stable silicon carbide pressure sensor. Background Technology

[0002] A silicon carbide pressure sensor is a pressure sensing device made of silicon carbide (SiC) material;

[0003] Traditional silicon carbide pressure sensors face severe challenges in packaging reliability under extreme conditions (such as high-frequency vibration, high humidity, and strong impact environments). In existing technologies, sensor components mostly rely on wired hard connections or adhesive encapsulation. Wired connections are prone to loosening under continuous mechanical vibration, resulting in gaps at the sealing interface. Moisture / corrosive media can seep into the sensitive element area, causing oxidation and failure of the piezoresistive film layer.

[0004] In view of this, a stable silicon carbide pressure sensor is proposed. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] Given the following technical problems in existing technologies: the packaging reliability of traditional silicon carbide pressure sensors faces severe challenges under extreme operating conditions (such as high-frequency vibration, high humidity, and strong impact environments). In existing technologies, sensor components mostly rely on wired hard connections or adhesive encapsulation. Wired connections are prone to loosening under continuous mechanical vibration, resulting in gaps at the sealing interface. Moisture / corrosive media can seep into the sensitive element area, causing oxidation and failure of the piezoresistive film layer.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a stable silicon carbide pressure sensor, including a cover and a protective cylinder;

[0008] The protective cylinder is located at the upper opening of the cover. The cover and the protective cylinder have sides at an inclined angle facing each other. A circular groove is pre-reserved on the inclined side of the protective cylinder. A first docking seat is installed on the side of the cover facing the protective cylinder. A second docking seat is installed inside the protective cylinder. The first and second docking seats are fitted together. An O-ring is installed on the inclined side of the cover, corresponding to the circular groove. A pair of fan-shaped pieces are arranged on the side of the cover facing the protective cylinder. The peripheral walls of the fan-shaped pieces are milled with threaded grooves. An O-ring is hinged to the peripheral wall of the protective cylinder. The inner edge of the O-ring is milled with threaded grooves. The fan-shaped pieces are threadedly connected to the O-ring via the threaded grooves. A destruction module is arranged on the peripheral surface of the protective cylinder. A restraint module is arranged along the inner edge of the protective cylinder.

[0009] As a preferred technical solution for a stable silicon carbide pressure sensor, the circumferential surface of the cover has a pair of entry channels, and the inclined side of the protective cylinder has a ring-shaped groove three, in which an O-ring is disposed.

[0010] As a preferred technical solution for a stable silicon carbide pressure sensor, the destruction module includes a linkage ring, a second ring-shaped channel, a traction cable, and a square plate. The second ring-shaped channel is milled at the inner edge of the third ring-shaped channel, and the linkage ring is hingedly disposed in the second ring-shaped channel.

[0011] As a preferred technical solution for a stable silicon carbide pressure sensor, the traction cable is installed at the edge of the linkage ring, and the square plate is disposed at one end of the traction cable on the circumference of the protective cylinder.

[0012] As a preferred technical solution for a stable silicon carbide pressure sensor, the limiting module includes a locking element, an O-ring two, and an O-ring three. The locking element is installed on the inner edge of the protective cylinder. The upper part of the locking element is defined as a slope section, and the lower part of the locking element is defined as an elastic section. An elongated channel is milled on the elastic section.

[0013] As a preferred technical solution for a stable silicon carbide pressure sensor, the locking member has a concave groove one reserved on the inner edge of the middle section and a concave groove two reserved on the outer edge of the middle section. The first concave groove is located near the slope section, and the second concave groove is located near the elastic section.

[0014] As a preferred technical solution for a stable silicon carbide pressure sensor, the middle peripheral wall of the docking seat is provided with a raised section, the concave groove is provided with an O-ring, and the concave groove is provided with an O-ring.

[0015] As a preferred technical solution for a stable silicon carbide pressure sensor, a raised pad is provided along the inner edge of the middle section of the locking member, and the raised pad contacts the raised section.

[0016] As a preferred technical solution for a stable silicon carbide pressure sensor, the inner edge of the protective cylinder is milled with a fan-shaped groove, the lower surface of the fan-shaped groove is chamfered, and the outer contour of both the fan-shaped groove and the slope section is 1 / 4 circle.

[0017] As a preferred technical solution for a stable silicon carbide pressure sensor, the inner edge of the lower part of the protective cylinder is defined as the bulging section, the lower part of the first docking seat is defined as the second raised section, and the lower edge of the elastic section abuts against the upper edge of the second raised section.

[0018] The beneficial effects of this invention are:

[0019] 1. This silicon carbide pressure sensor uses O-rings 2 and 3 as protective cylinders and docking seat 1 to provide comprehensive isolation. A continuous sealed interface is formed between docking seat 1, locking parts, and protective cylinder, which effectively prevents external water vapor, dust and other contaminants from entering the sensor, ensuring the long-term stability and measurement accuracy of the silicon carbide pressure sensor.

[0020] 2. This silicon carbide pressure sensor uses a locking element to press against the raised section: after being pressed, the outer periphery of the locking element bulges out and forms an interference fit with the inner wall of the protective cylinder. Combined with the snap-fit ​​between the slope section and the fan-shaped groove, it achieves mechanical self-locking and prevents the components from loosening due to linear bending or impact from external forces.

[0021] 3. This silicon carbide pressure sensor uses a limiting design of an elastic section and a raised section two. When the elastic section is compressed, it bends and abuts against the raised section two, further limiting the displacement of the locking component and ensuring the positional stability of the component in a dynamic environment.

[0022] 4. This silicon carbide pressure sensor enhances friction through the convex pad and increases the roughness of the inner wall of the locking part, thereby increasing the linkage resistance between the docking seat and the locking part, ensuring synchronous rotation of the locking part during disassembly and linkage of the docking seat with the locking part when the docking seat is inserted.

[0023] 5. When maintaining this silicon carbide pressure sensor, simply rotate the cover 1 / 4 turn to release the jamming restriction between the slope section and the fan-shaped ditch. The locking part automatically disengages from the protective cylinder under the reset action of the elastic section, achieving tool-free quick disassembly and significantly reducing maintenance costs and time.

[0024] By integrating locking components, elastic sections, and sealing rings into a multi-functional design, redundant parts are reduced, space occupancy is optimized, and the overall structure is simple and highly reliable.

[0025] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 This is a cross-sectional view of the present invention. Figure 1 .

[0029] Figure 3 This is a cross-sectional view of the present invention. Figure 2 .

[0030] Figure 4 This is a cross-sectional view of the present invention. Figure 3 .

[0031] Figure 5 This is a schematic diagram of the inclined side plate of the protective cylinder of the present invention.

[0032] Figure 6 This is a schematic diagram of the overall locking component of the present invention.

[0033] Figure 7 A cross-sectional view of the locking component of the present invention. Figure 1 .

[0034] Figure 8 A cross-sectional view of the locking component of the present invention. Figure 2 .

[0035] Figure label:

[0036] 100. Cover; 101. Entry passage; 102. Protective cylinder; 103. Circular trench one; 104. Circular trench two; 105. Circular trench three; 106. Fan-shaped trench; 107. Bulging section; 108. Docking seat one; 109. Raised section one; 110. Raised section two; 111. O-ring one; 112. Fan-shaped piece; 113. O-ring clamp; 114. O-ring pad; 115. Linkage ring; 116. Traction cable; 117. Square plate; 118. Locking element; 119. Sloping section; 120. Elastic section; 121. Concave trench one; 122. Concave trench two; 123. O-ring two; 124. O-ring three; 125. Protruding pad; 126. Docking seat two. Detailed Implementation

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0041] Example, refer to Figures 1 to 3 A stable silicon carbide pressure sensor includes a cover 100 and a protective cylinder 102;

[0042] The protective cylinder 102 is located at the upper opening of the cover 100. The sensor chip in the protective cylinder 102 is made of silicon carbide substrate material, giving it high strength, high hardness, and good thermal stability, enabling it to withstand high temperatures and harsh environments. The cover 100 and the protective cylinder 102 have inclined sides facing each other. When the cover 100 is connected to the protective cylinder 102, the inclined sides of the cover 100 and the protective cylinder 102 are in contact. If a positional deviation occurs during the connection process, the inclined sides prevent a gap between the cover 100 and the protective cylinder 102. The inclined side of the protective cylinder 102 has a pre-reserved circular groove 103. A first docking seat 108 is installed on the side of the cover 100 facing the protective cylinder 102, and a second docking seat 126 is installed in the protective cylinder 102. The first docking seat 108 and the second docking seat 126 are fitted together. An O-shaped groove is installed on the inclined side of the cover 100. O-ring 111 corresponds to the annular groove 103. When the cover 100 and the protective cylinder 102 are connected, their inclined sides touch, and the O-ring 111 is positioned between the annular groove 103. The cooperation between the O-ring 111 and the annular groove 103 prevents moisture from the application site from entering the middle part of the cover 100 and the protective cylinder 102 when they are connected. The side of the cover 100 facing the protective cylinder 102 is equipped with a number of... The fan-shaped piece 112 has a threaded groove milled on its peripheral wall. The peripheral wall of the protective cylinder 102 is hinged with an O-ring 113. The inner edge of the O-ring 113 has a threaded groove milled on it. The fan-shaped piece 112 and the O-ring 113 are connected by the threaded groove. By rotating the O-ring 113, the fan-shaped piece 112 will move toward the protective cylinder 102, thereby assembling the cover 100 onto the protective cylinder 102.

[0043] Reference Figure 3 and 5The cover 100 has a pair of entry channels 101 pre-reserved on its circumferential surface. The protective cylinder 102 has a circular groove 105 pre-reserved on its inclined side. When the cover 100 is attached to the protective cylinder 102, the entry channels 101 and the circular groove 105 correspond in position. An O-ring 114 is placed in the circular groove 105. Gel is added to the entry channels 101. During normal use, the entry channels 101 are blocked by a plug. The gel reaches the circular groove 105 from the entry channels 101. The O-ring 114 condenses at part 05, which adheres to the inclined side of the cover 100 and the protective cylinder 102, preventing moisture from the application site from reaching its interior. The O-ring 114 is also adhesive, and the condensed O-ring 114 ensures a stable connection between the cover 100 and the protective cylinder 102. The protective cylinder 102 is equipped with a breaking module on its circumference, which can break the O-ring 114 to facilitate the removal of the cover 100 from the protective cylinder 102 for maintenance.

[0044] Reference Figure 4 and 5 The destruction module includes a linkage ring 115, a second circular trench 104, a traction cable 116, and a square plate 117. The second circular trench 104 is milled into the inner edge of the third circular trench 105. The linkage ring 115 is hinged in the second circular trench 104. The square plate 117 is disposed on the outer circumferential surface of the protective cylinder 102. One end of the traction cable 116 is installed at the edge of the outer diameter surface of the linkage ring 115, and the other end of the traction cable 116 passes through the third circular trench 105 in sequence. 5. The gap between the cover 100 and the inclined side of the protective cylinder 102 is then installed on the square plate 117. The square plate 117 can be removed or embedded between the cover 100 and the O-ring 113. When the square plate 117 and the cover 100 rotate synchronously, the linkage between the square plate 117, the traction cable 116, and the linkage ring 115 can be used to make the linkage ring 115 rotate in the circular trench 104. At this time, the traction cable 116 can destroy the O-ring 114.

[0045] The above achieves the following: During the assembly of the silicon carbide pressure sensor, the mating seat 108 of the cover 100 is embedded towards the protective cylinder 102. When the fan-shaped plate 112 and the O-ring 113 come into contact, the O-ring 113 can be rotated. In this step, the cover 100 is still embedded in the protective cylinder 102. At this time, the cover 100 can better connect with the protective cylinder 102. When the cover 100 and the protective cylinder 102 are fully in contact, the O-ring 111 touches the inner edge of the circular groove 103. At this time, the O-ring 111 is compressed, preventing moisture from the application site from reaching the inside of the cover 100 and the protective cylinder 102 from this position.

[0046] After the cover 100 and the protective cylinder 102 are connected, gel is added to the inlet channel 101. Since the circular groove 105 is circular, the gel can solidify into a circular O-ring 114. Under the inclined side characteristics, the properties of the O-ring 114 after solidification can be guaranteed.

[0047] When the wiring harness in the cover 100 is pulled by forces in different directions, the cover 100 and the protective cylinder 102 will have a slight offset. Relying on the tilted side, these opposing forces will change into a slight rotational force, which is unrelated to the contact between the cover 100 and the protective cylinder 102, further reducing the possibility of moisture in the application site reaching the interior of the cover 100 and the protective cylinder 102.

[0048] When maintaining the silicon carbide pressure sensor, it is preferable to remove the square plate 117 with tweezers and attach it to the surface of the cover 100, while simultaneously clamping the cover 100 and the square plate 117. A rotation operation is then performed relative to the protective cylinder 102. The square plate 117 is linked to the linkage ring 115 via the traction cable 116. Therefore, during the rotation of the square plate 117, the traction cable 116 is straightened, causing the linkage ring 115 to rotate. During this process, the traction cable 116, passing through the area of ​​the circular groove 105, forms a (ring-shaped) motion trajectory on the truncated cone surface (side of the truncated cone), effectively dividing the O-ring 114 and destroying it. At this point, the gel will no longer affect the adhesion of the cover 100 and the protective cylinder 102, and will restrict the O-ring 113. Under the action of the threaded connection, the cover 100 will move outwards, allowing for maintenance of the silicon carbide pressure sensor.

[0049] Reference Figure 3 , 67 and 8, the inner edge of the protective cylinder 102 is provided with a limiting module, which includes a locking element 118, an O-ring 123, and an O-ring 124. The locking element 118 is installed on the inner edge of the protective cylinder 102. The upper part of the locking element 118 is defined as the slope section 119, and the lower part of the locking element 118 is defined as the elastic section 120. A concave groove 121 is reserved on the inner edge of the middle section of the locking element 118, and a concave groove 122 is reserved on the outer edge of the middle section of the locking element 118. The concave groove 121 is located near the slope section 119, and the concave groove 122 is located near the elastic section 120. At position 20, the slope section 119 and the elastic section 120 are flexible. The middle section of the docking seat 108 is provided with a raised section 109. When the docking seat 108 reaches the inner edge of the locking member 118, the raised section 109 will press the middle section of the locking member 118 in the direction of the protective cylinder 102, causing the middle section of the locking member 118 to bulge out. An O-ring 123 is provided in the concave groove 121. When the raised section 109 corresponds to the locking member 118, the O-ring 123 will be in close contact with the surface of the concave groove 121 and the raised section 109.

[0050] Reference Figure 7 and 8 At this moment, O-ring 123 can block the space between docking seat 108 and locking member 118. O-ring 124 is arranged in concave groove 122. When the raised section 109 presses the locking member 118 out, O-ring 124 is in close contact with the protective cylinder 102 and the inner edge surface of concave groove 122. At this moment, O-ring 124 can block the space between the protective cylinder 102 and locking member 118.

[0051] Reference Figure 7 The locking member 118 has a raised pad 125 on its inner edge in the middle section. The raised pad 125 contacts the raised section 109. The raised pad 125 roughens the inner edge of the locking member 118, increasing the resistance between the raised section 109 and the locking member 118 when it is inserted. The inner edge of the protective cylinder 102 is milled with a fan-shaped groove 106. The lower surface of the fan-shaped groove 106 is chamfered to facilitate the movement of the slope section 119 toward the protective cylinder 102 and correspond to different fan-shaped grooves 106. The outer contour of a single fan-shaped groove 106 and the slope section 119 is 1 / 4 circle. When the slope section 119 and the fan-shaped groove 106 are misaligned, the fan-shaped groove 106 cannot restrict the slope section 119.

[0052] Reference Figure 7The elastic segment 120 is milled with an elongated channel, allowing it to deform under pressure. The inner edge of the lower part of the protective cylinder 102 is defined as the bulge segment 107, which acts on the elastic segment 120. When the locking member 118 moves toward the protective cylinder 102 until the elastic segment 120 aligns with the bulge segment 107, the elastic segment 120 is compressed and deforms under pressure. The lower part of the mating seat 108 is defined as the raised section 110, and the lower edge of the elastic segment 120 abuts against the upper edge of the raised section 110. When the elastic segment 120 is gradually compressed by the bulging segment 107, the lower part of the elastic segment 120 will bend towards the docking seat 108. Finally, the lower edge of the elastic segment 120 will abut against the upper edge of the raised segment 110. At this time, the position of the raised segment 110 will be restricted. The outer radial direction of the raised segment 110 is smaller than that of the raised segment 109, ensuring that the raised segment 110 will not compress the locking member 118 when the docking seat 108 moves towards the protective cylinder 102.

[0053] Working principle: To avoid the gaps caused by vibration after direct wire connection assembly of silicon carbide pressure sensors, the overall stability is improved under the pressure of the components.

[0054] When the cover 100 is embedded in the protective cylinder 102, the cover 100 is linked to the docking seat 108 and extends into the interior of the protective cylinder 102. At this time, the raised section 110 extends out of the interior of the locking member 118. At this time, the raised section 109 reaches the position of the O-ring 123. The raised section 109 presses against the locking member 118, and the O-ring 123 will be in close contact with the concave groove 121 and the surface wall of the raised section 109. At this time, the O-ring 123 can block the space between the docking seat 108 and the locking member 118.

[0055] During this process, the locking member 118 will be compressed by the raised section 109, causing the outer periphery of the locking member 118 to bulge out. At this time, the O-ring 124 will be pressed against the inner edge of the protective cylinder 102. The O-ring 124 is in close contact with the inner edge of the protective cylinder 102 and the concave groove 122. At this time, the O-ring 124 can block the space between the protective cylinder 102 and the locking member 118. At this time, the locking member 118 can fill the space between the docking seat 108 and the inner edge of the protective cylinder 102, preventing moisture from the application site from entering its middle position.

[0056] When the inner edge of the raised section 109 and the locking member 118 comes into contact, the roughness of the inner edge of the locking member 118 is increased by the convex pad 125. The mating seat 108 relies on the resistance of the convex pad 125 on the raised section 109. At this time, the mating seat 108 can move together with the locking member 118 when it moves. When the elastic section 120 comes into contact with the bulge section 107, the locking member 118 continues to move with the mating seat 108. The lower part of the elastic section 120 will bend towards the mating seat 108. The lower edge of the elastic section 120 abuts against the upper edge of the raised section 110. At this time, the locking member 118 stops moving, and the elastic section 120 restricts the position of the raised section 110.

[0057] When the locking member 118 moves together with the docking seat 108, the slope section 119 will engage with the fan-shaped groove 106 at different positions. When the locking member 118 reaches the final position, the structure of the fan-shaped groove 106 can restrict the position of the locking member 118. At this time, the cover 100 is not easy to loosen after docking on the protective cylinder 102, thus ensuring the effectiveness of the silicon carbide pressure sensor.

[0058] When maintaining the silicon carbide pressure sensor, the cover 100 is rotated. The docking seat 108 rotates synchronously with the locking member 118, relying on the convex pad 125. When the locking member 118 rotates to the point where the slope section 119 is misaligned with the fan-shaped groove 106 (i.e., 1 / 4 turn), the fan-shaped groove 106 will no longer restrict the locking member 118. After the force is released, the locking member 118 will return to its natural state. Under the pushing force of the bulging section 107, the elastic section 120 will push the locking member 118 towards... Moving towards the cover 100, at this moment the raised section 110 is no longer restricted by the elastic section 120. Under the threaded action caused by the rotation of the O-ring 113, the cover 100 and the docking seat 108 are vertically removed. During this process, the locking member 118 also moves with the docking seat 108. When the slope section 119 collides with the inclined side of the protective cylinder 102, the raised section 109 will separate from the locking member 118 under the continuous force, and the cover 100 can be removed for maintenance.

[0059] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A stable silicon carbide pressure sensor, characterized in that: Includes a cover and a protective sleeve; The protective cylinder is located at the upper opening of the cover. The cover and the protective cylinder have sides at an inclined angle facing each other. A circular groove is pre-reserved on the inclined side of the protective cylinder. A first docking seat is installed on the side of the cover facing the protective cylinder. A second docking seat is installed inside the protective cylinder. The first and second docking seats are fitted together. An O-ring is installed on the inclined side of the cover, corresponding to the circular groove. A pair of fan-shaped pieces are arranged on the side of the cover facing the protective cylinder. The peripheral wall of each fan-shaped piece is milled with threaded grooves. An O-ring is hinged to the peripheral wall of the protective cylinder. The inner edge of the O-ring is milled with threaded grooves. The fan-shaped pieces are threadedly connected to the O-ring via these threaded grooves. A destruction module is arranged on the peripheral surface of the protective cylinder. A restraint module is arranged along the inner edge of the protective cylinder. The cover has a pair of entry channels reserved on its circumferential surface, and the protective cylinder has a ring-shaped groove three reserved on its inclined side, with an O-ring pad disposed in the ring-shaped groove three. The destruction module includes a linkage ring, a second circular trench, a traction cable, and a square plate. The second circular trench is milled at the inner edge of the third circular trench. The linkage ring is hinged in the second circular trench. The traction cable is installed at the edge of the linkage ring, and the square plate is located at one end of the traction cable on the circumference of the protective cylinder. The limiting module includes a locking element, an O-ring two, and an O-ring three. The locking element is installed on the inner edge of the protective cylinder. The upper part of the locking element is defined as a slope section, and the lower part of the locking element is defined as an elastic section. The elastic section is milled with a long channel. The inner edge of the middle section of the locking element is provided with a protruding pad, and the protruding pad contacts the raised section one. The locking member has a concave groove one reserved along the inner edge of the middle section and a concave groove two reserved along the outer edge of the middle section. The first concave groove is located near the slope section, and the second concave groove is located near the elastic section. The middle section of the docking seat is provided with a raised section, the concave groove is provided with an O-ring, and the concave groove is provided with an O-ring.

2. The stable silicon carbide pressure sensor according to claim 1, characterized in that: The inner edge of the protective cylinder is milled with a fan-shaped groove, the lower surface of the fan-shaped groove is chamfered, and the outer contour of both the fan-shaped groove and the slope section is 1 / 4 circle.

3. The stable silicon carbide pressure sensor according to claim 1, characterized in that: The inner edge of the lower part of the protective cylinder is defined as the bulging section, the lower part of the first docking seat is defined as the second raised section, and the lower edge of the elastic section abuts against the upper edge of the second raised section.

4. The method of using the stable silicon carbide pressure sensor according to any one of claims 1-3, characterized in that, include: S1. During assembly, the docking seat is inserted into the protective cylinder. When the fan-shaped piece touches the O-ring, the O-ring is rotated. When the cover and the protective cylinder are fully in contact, the O-ring touches the inner edge of the circular groove. At this time, the O-ring is compressed to prevent moisture from the application site from reaching the inside of the cover and the protective cylinder. S2. After the cover and protective tube are connected, gel is added to the inlet channel. Since the three circular grooves are circular, the gel can solidify into a circular O-ring. Under the inclined side characteristics, the properties of the O-ring after solidification can be guaranteed. S3. When the wire harness in the cover is pulled by forces in different directions, the cover and the protective sleeve will have a slight offset. Relying on the tilted side, these opposing forces will change into a slight rotational force, which is unrelated to the contact between the cover and the protective sleeve, further reducing the possibility of moisture in the application site reaching the inside of the cover and the protective sleeve. S4. During maintenance, remove the square plate and attach it to the surface of the cover. Hold the cover and the square plate at the same time and rotate them. When the length of the traction cable is limited, the square plate rotates by relying on the linkage ring of the traction cable. During this process, the traction cable damages the O-ring and restricts the O-ring. Under the action of the threaded connection, the linkage cover will move outward.

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