Stable silicon carbide pressure sensor

Abstract

The invention relates to a stable silicon carbide pressure sensor which comprises a blocking cover and a protective cylinder. The protective cylinder is located at an upper opening of the blocking cover, a side edge with an inclined angle is arranged at the position where the blocking cover and the protective cylinder face each other, a first ring-shaped groove is reserved in the inclined side edge of the protective cylinder, a first butt joint seat is arranged on the face, facing the protective cylinder, of the blocking cover, and a second butt joint seat is arranged in the protective cylinder. The first butt joint seat and the second butt joint seat are connected in an embedded mode, and a first O-shaped ring is arranged on the inclined side edge of the blocking cover and corresponds to the first ring-shaped groove. According to the silicon carbide pressure sensor, the protection cylinder and the first butt joint seat are comprehensively blocked through the second O-shaped ring and the third O-shaped ring, a continuous closed interface is formed among the first butt joint seat, the locking piece and the protection cylinder, external water vapor, dust and other pollutants are effectively prevented from invading the sensor, and the long-term stability and the measurement precision of the silicon carbide pressure sensor are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of silicon carbide pressure sensors, and specifically relates to a stable silicon carbide pressure sensor. Background Art

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

[0003] The packaging reliability of traditional silicon carbide pressure sensors faces severe challenges under extreme working conditions (such as high-frequency vibration, high humidity, and strong impact environments). In the prior art, sensor components mostly rely on threaded hard connections or adhesive packaging. The threaded connection is prone to looseness under continuous mechanical vibration, resulting in fine cracks in the sealing interface, and water vapor / corrosive media seeping into the sensitive element area, causing oxidation 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 part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. In this part, as well as in the abstract and title of the present application, some simplifications or omissions may be made to avoid obscuring the purpose of this part, the abstract, and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the following technical problems in the prior art: the packaging reliability of traditional silicon carbide pressure sensors faces severe challenges under extreme working conditions (such as high-frequency vibration, high humidity, and strong impact environments). In the prior art, sensor components mostly rely on threaded hard connections or adhesive packaging. The threaded connection is prone to looseness under continuous mechanical vibration, resulting in fine cracks in the sealing interface, and water vapor / corrosive media seeping into the sensitive element area, causing oxidation failure of the piezoresistive film layer.

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

[0008] The protection cylinder is located at the upper opening of the baffle. The parts of the baffle and the protection cylinder facing each other are provided with inclined side edges. A circular groove 1 is reserved on the inclined side edge of the protection cylinder. A docking seat 1 is arranged on the side of the baffle facing the protection cylinder. A docking seat 2 is arranged in the protection cylinder. The docking seat 1 and the docking seat 2 are fitted and connected. An O-ring 1 is arranged on the inclined side edge of the baffle. The O-ring 1 corresponds to the circular groove 1. A pair of sector pieces are arranged on the side of the baffle facing the protection cylinder. Threaded tooth grooves are milled on the peripheral wall of the sector pieces. An O-shaped hoop is hinged on the peripheral wall of the protection cylinder. Threaded tooth grooves are milled on the inner edge of the O-shaped hoop. The sector pieces are threadedly connected to the O-shaped hoop by means of the threaded tooth grooves; A damage module is arranged on the peripheral surface of the protection cylinder; A limiting module is arranged on the inner edge of the protection cylinder.

[0009] As a preferred technical solution of a stable silicon carbide pressure sensor, a pair of access channels are reserved at the peripheral surface position of the baffle. A circular groove 3 is reserved on the inclined side edge of the protection cylinder. An O-shaped gasket is arranged in the circular groove 3.

[0010] As a preferred technical solution of a stable silicon carbide pressure sensor, the damage module includes a linkage ring, a circular groove 2, a traction cable and a square plate. The circular groove 2 is milled at the inner edge position of the circular groove 3. The linkage ring is hingedly arranged in the circular groove 2.

[0011] As a preferred technical solution of a stable silicon carbide pressure sensor, the traction cable is arranged at the edge position of the linkage ring. The square plate is arranged at one end of the traction cable on the peripheral surface of the protection cylinder.

[0012] As a preferred technical solution of a stable silicon carbide pressure sensor, the limiting module includes a locking piece, an O-ring 2 and an O-ring 3. The locking piece is arranged on the inner edge of the protection cylinder. The upper part of the locking piece is defined as a slope section. The lower part of the locking piece is defined as an elastic section. A long strip channel is milled on the elastic section.

[0013] As a preferred technical solution of a stable silicon carbide pressure sensor, a concave groove 1 is reserved on the inner edge of the middle section of the locking piece. A concave groove 2 is reserved on the outer edge of the middle section of the locking piece. The concave groove 1 is located near the slope section. The concave groove 2 is located near the elastic section.

[0014] As a preferred technical solution of a stable silicon carbide pressure sensor, a raised section 1 is arranged on the peripheral wall of the middle section of the docking seat 1. The O-ring 2 is arranged in the concave groove 1. The O-ring 3 is arranged in the concave groove 2.

[0015] As a preferred technical solution for a stable silicon carbide pressure sensor, a convex pad is disposed on the inner edge of the middle section of the locking member, and the convex pad is in contact with the raised section.

[0016] As an optimal technical solution for a stable silicon carbide pressure sensor, a fan-shaped groove is milled on the inner edge of the protective tube, the lower surface of the fan-shaped groove is chamfered, and the outer contours of the fan-shaped groove and the slope section are both 1 / 4 circle.

[0017] As an optimal technical solution for a stable silicon carbide pressure sensor, the inner edge of the lower part of the protective tube is defined as a bulging section, the lower part of the docking seat one is defined as a raised section two, and the lower edge position of the elastic section conflicts with the upper edge position of the raised section two.

[0018] Beneficial effects of the present invention:

[0019] 1. The silicon carbide pressure sensor is fully isolated by O-ring 2 and O-ring 3 for the protective tube and docking seat 1, forming a continuous closed interface between the docking seat 1, the locking piece and the protective tube, effectively blocking external water vapor, dust and other pollutants from invading the interior of the sensor, ensuring the long-term stability and measurement accuracy of the silicon carbide pressure sensor;

[0020] 2. The silicon carbide pressure sensor is pressed and matched with the locking piece and the bulge section: the outer periphery of the locking piece bulges out after being pressed, forming an interference fit with the inner wall of the protective tube, and the mechanical self-locking is realized by combining the clamping of the slope section and the fan-shaped groove to prevent the loosening of the components caused by the bending of the line speed or the impact of external force;

[0021] 3. The silicon carbide pressure sensor adopts the limit design of the elastic section and the second raised section. When the elastic section is under pressure, it folds and contacts with the second raised section, which further limits the displacement of the locking part and ensures the position stability of the component in a dynamic environment.

[0022] 4. The silicon carbide pressure sensor is enhanced by friction of the convex pad, and by increasing the roughness of the inner wall of the locking piece, the linkage resistance between the docking seat 1 and the locking piece is improved, ensuring the synchronous rotation of the locking piece when disassembling and the linkage of the locking piece when the docking seat 1 is embedded;

[0023] 5. When maintaining the silicon carbide pressure sensor, you only need to rotate the cover 1 / 4 turn to release the clamping restriction between the slope section and the fan-shaped groove. The locking piece will automatically detach from the protective tube under the reset action of the elastic section, realizing tool-free quick disassembly, significantly reducing maintenance costs and time;

[0024] By integrating the multifunctional design of the locking piece, elastic section and sealing ring, redundant parts are reduced, space occupancy is optimized, and the overall structure is simple and reliable.

[0025] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the drawings required in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings may be obtained based on these drawings. Among them:

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

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

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

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

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

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

[0033] Figure 7 is a sectional view of the locking member of the present invention Figure 1 .

[0034] Figure 8 is a sectional view of the locking member of the present invention Figure 2 .

[0035] Reference numerals:

[0036] 100. Cover; 101. Inlet channel; 102. Protective cylinder; 103. Circular groove one; 104. Circular groove two; 105. Circular groove three; 106. Sector groove; 107. Bulging section; 108. Docking seat one; 109. Bulging section one; 110. Bulging section two; 111. O-ring one; 112. Sector plate; 113. O-ring hoop; 114. O-shaped gasket; 115. Linking ring; 116. Towing cable; 117. Square plate; 118. Locking part; 119. Slope section; 120. Elastic section; 121. Concave groove one; 122. Concave groove two; 123. O-ring two; 124. O-ring three; 125. Convex point gasket; 126. Docking seat two. Detailed implementation manner

[0037] In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manner of the present invention with reference to the accompanying drawings of the specification.

[0038] In the following description, many specific details are set forth to facilitate a thorough understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0039] Secondly, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures, or characteristics that can be included in at least one implementation manner of the present invention. The phrase "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is separate or selectively exclusive of other embodiments.

[0040] Furthermore, the present invention is described in detail in conjunction with the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally not in accordance with the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

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

[0042] The protective cylinder 102 is located at the upper opening part of the cover 100. The sensor chip in the protective cylinder 102 is made of silicon carbide base material, making it have high strength, high hardness and good thermal stability, and can withstand high temperature and harsh environment. The parts of the cover 100 and the protective cylinder 102 facing each other are provided with inclined side edges. When connecting the cover 100 to the protective cylinder 102, the side edges of the cover 100 and the protective cylinder 102 facing each other are in contact. When there is a deviation in the position during the connection process of the cover 100 and the protective cylinder 102, the inclined side edges can prevent a gap from occurring between the cover 100 and the protective cylinder 102. A circular groove 103 is reserved on the inclined side edge of the protective cylinder 102. A docking seat 108 is arranged on the surface of the cover 100 facing the protective cylinder 102. A docking seat 126 is arranged in the protective cylinder 102. The docking seat 108 and the docking seat 126 are fitted and connected. An O-ring 111 is arranged on the inclined side edge of the cover 100, and the O-ring 111 corresponds to the circular groove 103. When the cover 100 and the protective cylinder 102 are connected, their inclined side edges are in contact, and the O-ring 111 will be located between the circular grooves 103. The cooperation between the O-ring 111 and the circular groove 103 can prevent the water vapor in the application site from entering the middle position when the cover 100 and the protective cylinder 102 are connected. A pair of sector pieces 112 are arranged on the surface of the cover 100 facing the protective cylinder 102. Threaded tooth grooves are milled on the peripheral wall of the sector pieces 112. An O-shaped hoop 113 is hinged on the peripheral wall of the protective cylinder 102. Threaded tooth grooves are milled on the inner edge of the O-shaped hoop 113. The sector pieces 112 are threadedly connected to the O-shaped hoop 113 by means of the threaded tooth grooves. By rotating the O-shaped hoop 113, the sector pieces 112 will move towards the protective cylinder 102 at this moment, so as to assemble the cover 100 onto the protective cylinder 102.

[0043] Refer to Figure 3 and 5, a pair of access channels 101 are reserved at the circumferential position of the retaining cover 100, and a circular groove three 105 is reserved on the inclined side of the protective cylinder 102. When the retaining cover 100 is docked to the protective cylinder 102, the access channels 101 correspond to the position of the circular groove three 105. An O-ring 114 is arranged in the circular groove three 105. Gel is added to the access channels 101. Normally, the outside of the access channels 101 is blocked by a plug during use. The gel reaches the position of the circular groove three 105 from the position of the access channels 101 and condenses into an O-ring 114. The O-ring 114 pastes the inclined sides of the retaining cover 100 and the protective cylinder 102, preventing the water vapor in the application site from reaching its internal position and having viscosity. The condensed O-ring 114 can ensure the stable connection effect of the retaining cover 100 on the protective cylinder 102. A destruction module is arranged on the circumferential surface of the protective cylinder 102. The destruction module can destroy the O-ring 114 to facilitate the operation of removing the retaining cover 100 from the protective cylinder 102 for maintenance.

[0044] Refer to Figure 4 and 5 , the destruction module includes a linkage ring 115, a circular groove two 104, a traction cable 116 and a square plate 117. The circular groove two 104 is milled on the inner edge position of the circular groove three 105. The linkage ring 115 is hingedly arranged in the circular groove two 104. The square plate 117 is arranged on the outer circumferential surface of the protective cylinder 102. One end of the traction cable 116 is arranged at the edge position of the outer diameter surface of the linkage ring 115. The other end of the traction cable 116 passes through the circular groove three 105 and the gap between the retaining cover 100 and the inclined side of the protective cylinder 102 in sequence and is arranged on the square plate 117. The square plate 117 can be taken out or embedded between the retaining cover 100 and the O-ring 113. When the square plate 117 rotates synchronously with the retaining cover 100, the linkage between the square plate 117, the traction cable 116 and the linkage ring 115 can be relied on to make the linkage ring 115 rotate in the circular groove two 104. At this moment, the traction rope 116 can destroy the O-ring 114.

[0045] Through the above, it can be realized that when assembling the silicon carbide pressure sensor, the docking seat one 108 part of the retaining cover 100 is embedded towards the protective cylinder 102. When the sector piece 112 touches the O-ring 113, the O-ring 113 can be rotated at this time. In this step, the retaining cover 100 is still embedded towards the position of the protective cylinder 102. At this time, the retaining cover 100 can be better connected to the protective cylinder 102. When the retaining cover 100 and the protective cylinder 102 are fully touched, the O-ring one 111 correspondingly touches the inner edge of the circular groove one 103 at this time. At this time, the O-ring one 111 is compressed, preventing the water vapor in the application site from reaching the inside of the retaining cover 100 and the protective cylinder 102 from this position.

[0046] After the baffle cover 100 and the protection cylinder 102 are connected, gel is added to the access channel 101. Since the loop-shaped groove three 105 is loop-shaped, the gel can solidify into a loop-shaped O-ring pad 114. Under the characteristics of the inclined side, the characteristics of the O-ring pad 114 after solidification can be ensured.

[0047] When the wire harness in the baffle cover 100 is pulled by forces in different directions, there will be a relatively slight offset between the baffle cover 100 and the protection cylinder 102. Relying on the inclined side, these off-axis forces will be converted into slight rotational forces, that is, regardless of the contact between the baffle cover 100 and the protection cylinder 102, further reducing the possibility of moisture in the application site reaching the inside of the baffle cover 100 and the protection cylinder 102.

[0048] When maintaining the silicon carbide pressure sensor, it is preferably to pick out the square plate 117 with tweezers, attach it to the surface of the baffle cover 100, and clamp the baffle cover 100 and the square plate 117 at the same time, and perform a rotational operation relative to the protection cylinder 102. Among them, the square plate 117 is linked to the linkage ring 115 through the traction cable 116. Therefore, during the rotation of the square plate 117, the traction cable 116 is straightened and drives the linkage ring 115 to rotate. During this process, the traction cable 116 passing through the area of the loop-shaped groove three 105 forms a conical table surface (the side surface of the frustum of a cone) (annular) movement trajectory, which can effectively divide the O-ring pad 114 and achieve the destruction of the O-ring pad 114. At this time, the gel will no longer play a role in sticking the baffle cover 100 and the protection cylinder 102, and restricts the O-ring clamp 113. At this time, under the action of the wire connection, the baffle cover 100 will move in the outward direction, and at this time, maintenance operations can be performed on the silicon carbide pressure sensor.

[0049] Refer to Figure 3 、 6, 7 and 8, a limiting module is arranged on the inner edge of the protection cylinder 102. The limiting module includes a locking member 118, an O-ring II 123 and an O-ring III 124. The locking member 118 is arranged on the inner edge of the protection cylinder 102. The upper position of the locking member 118 is defined as a slope section 119, and the lower position of the locking member 118 is defined as an elastic section 120. A concave groove I 121 is reserved on the inner edge of the middle section of the locking member 118, and a concave groove II 122 is reserved on the outer edge of the middle section of the locking member 118. The concave groove I 121 is located near the slope section 119, and the concave groove II 122 is located near the elastic section 120. Among them, the slope section 119 and the elastic section 120 are flexible. A raised section I 109 is arranged on the circumferential wall of the middle section of the docking seat I 108. When the docking seat I 108 reaches the position of the inner edge of the locking member 118, the raised section I 109 will press the middle section of the locking member 118 towards the protection cylinder 102, so that the circumferential wall position of the middle section of the locking member 118 will bulge. An O-ring II 123 is arranged in the concave groove I 121. When the raised section I 109 corresponds to the locking member 118, the O-ring II 123 will closely adhere to the inner wall surfaces of the concave groove I 121 and the raised section I 109;

[0050] Refer to Figure 7 and 8 , at this time, the O-ring II 123 can block the space between the docking seat I 108 and the locking member 118. An O-ring III 124 is arranged in the concave groove II 122. When the raised section I 109 presses the locking member 118 to bulge, the O-ring III 124 will closely adhere to the inner wall surfaces of the protection cylinder 102 and the concave groove II 122. At this time, the O-ring III 124 can block the space between the protection cylinder 102 and the locking member 118.

[0051] Refer to Figure 7 , a convex point pad 125 is arranged on the inner edge of the middle section of the locking member 118. The convex point pad 125 touches the raised section I 109. By relying on the convex point pad 125, the inner edge of the locking member 118 is roughened, which improves the resistance between the raised section I 109 and the locking member 118 during embedding. A fan-shaped groove 106 is milled on the inner edge of the protection cylinder 102. The lower surface of the fan-shaped groove 106 is chamfered to facilitate the slope section 119 to correspond to different fan-shaped grooves 106 when moving towards the protection cylinder 102. The outer contours of a single fan-shaped groove 106 and the slope section 119 are both 1 / 4 circle. When the slope section 119 is misaligned with the fan-shaped groove 106, the fan-shaped groove 106 cannot play a limiting role on the slope section 119.

[0052] Refer to Figure 7, a long channel is milled on the elastic section 120, so that the elastic section 120 can undergo arc deformation after being compressed. The inner edge of the lower part of the protection cylinder 102 is defined as the bulging section 107, where the bulging section 107 acts on the elastic section 120. When the locking part 118 moves towards the protection cylinder 102 until the elastic section 120 corresponds to the bulging section 107, the elastic section 120 undergoes arc deformation after being compressed. The lower part of the docking seat one 108 is defined as the second bulging section 110. The lower edge position of the elastic section 120 abuts against the upper edge position of the second bulging section 110. When the elastic section 120 is gradually compressed by the bulging section 107, the lower part of the elastic section 120 will arc towards the direction of the docking seat one 108. Finally, the lower edge position of the elastic section 120 abuts against the upper edge position of the second bulging section 110. At this time, the position of the second bulging section 110 will be restricted. The outer diameter of the second bulging section 110 is smaller than the outer diameter of the first bulging section 109, ensuring that when the docking seat one 108 moves towards the position of the protection cylinder 102, the second bulging section 110 will not press on the locking part 118.

[0053] Working principle: To prevent the silicon carbide pressure sensor from generating fine cracks due to jitter after direct wire connection and assembly, under the pressing action of components, thereby improving the overall stability:

[0054] When the cover 100 is inserted into the protection cylinder 102, the cover 100 drives the docking seat one 108 to extend into the interior of the protection cylinder 102. At this time, the second bulging section 110 extends out of the interior of the locking part 118. At this time, the first bulging section 109 reaches the position of the O-ring two 123. The first bulging section 109 presses on the locking part 118, and the O-ring two 123 will closely adhere to the inner wall of the concave groove one 121 and the outer wall of the first bulging section 109. At this time, the O-ring two 123 can block the space between the docking seat one 108 and the locking part 118.

[0055] During this process, the locking part 118 will be pressed by the first bulging section 109, causing the outer periphery of the locking part 118 to bulge. At this time, the O-ring three 124 will be pressed against the inner edge of the protection cylinder 102. The O-ring three 124 closely adheres to the inner wall of the protection cylinder 102 and the inner wall of the concave groove two 122. At this time, the O-ring three 124 can block the space between the protection cylinder 102 and the locking part 118. At this time, the locking part 118 can fill the space between the docking seat one 108 and the inner edge of the protection cylinder 102, preventing the moisture in the application site from entering its middle position.

[0056] When the raised section 109 touches the inner edge of the locking piece 118, the roughness of the inner edge of the locking piece 118 can be increased by relying on the convex pad 125, and the docking seat 108 relies on the convex pad 125 to exert resistance on the raised section 109. At this time, the docking seat 108 can move together with the locking piece 118 when it moves. When the elastic section 120 touches the bulging section 107, the locking piece 118 continues to move with the docking seat 108 during this process. The lower part of the elastic section 120 will bend in the direction of the docking seat 108, and the lower edge position of the elastic section 120 will conflict with the upper edge position of the raised section 110. At this time, the locking piece 118 stops moving, and the elastic section 120 limits the position of the raised section 110.

[0057] When the locking piece 118 moves with the docking seat 108, the slope section 119 will engage with the fan-shaped groove 106 at different positions. When the locking piece 118 reaches the final position, the structure of the fan-shaped groove 106 can limit the position of the locking piece 118. At this moment, the cover 100 is not easy to loosen after docking on the protective tube 102, thereby ensuring the use effect of the silicon carbide pressure sensor.

[0058] When maintaining the silicon carbide pressure sensor, the cover 100 is rotated, and the docking seat 108 is synchronously rotated by the convex pad 125 to link the locking member 118. When the locking member 118 rotates to the misalignment between the slope section 119 and the fan-shaped groove 106, that is, 1 / 4 circle, the fan-shaped groove 106 will not restrict the locking member 118 at this moment. The locking member 118 will return to its natural state after unloading. The elastic section 120 will be pushed by the bulging section 107, and the locking member 118 will move toward It moves in the direction of the blocking cover 100. At this moment, the raised section 110 is not restricted by the elastic section 120. Under the thread connection effect caused by the rotation of the O-ring 113, the blocking cover 100 and the docking seat 108 are vertically taken out. In this process, the locking piece 118 also moves with the docking seat 108. When the slope section 119 collides with the inclined side of the protective tube 102, the raised section 109 will leave the locking piece 118 under the action of the continuous force, and the blocking cover 100 can be removed for maintenance operations.

[0059] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, without undue experimentation, the development effort will be a routine task of design, fabrication, and production.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A stable silicon carbide pressure sensor, characterized in that: It includes a retaining cover and a protective cylinder; The protective cylinder is located at the upper opening part of the retaining cover. The parts of the retaining cover and the protective cylinder facing each other are provided with inclined side edges. A circular groove 1 is reserved on the inclined side edge of the protective cylinder. A docking seat 1 is arranged on the side of the retaining cover facing the protective cylinder. A docking seat 2 is arranged in the protective cylinder. The docking seat 1 and the docking seat 2 are fitted and connected. An O-ring 1 is arranged on the inclined side edge of the retaining cover, and the O-ring 1 corresponds to the circular groove 1. A pair of sector pieces are arranged on the side of the retaining cover facing the protective cylinder. Threaded tooth grooves are milled on the peripheral wall of the sector piece. An O-shaped hoop is hinged on the peripheral wall of the protective cylinder. Threaded tooth grooves are milled on the inner edge of the O-shaped hoop. The sector piece is connected to the O-shaped hoop by threaded tooth grooves; A destruction module is arranged on the peripheral surface of the protective cylinder; A limiting module is arranged on the inner edge of the protective cylinder.

2. The stable silicon carbide pressure sensor according to claim 1, wherein: A pair of access channels are reserved at the peripheral surface position of the retaining cover. A circular groove 3 is reserved on the inclined side edge of the protective cylinder. An O-shaped gasket is arranged in the circular groove 3.

3. The stable silicon carbide pressure sensor according to claim 1, characterized in that: The destruction module includes a linkage ring, a circular groove 2, a traction cable and a square plate. The circular groove 2 is milled at the inner edge position of the circular groove 3. The linkage ring is arranged in the circular groove 2 in a hinged manner.

4. The stable silicon carbide pressure sensor according to claim 3, characterized in that: The traction cable is arranged at the edge position of the linkage ring. The square plate is arranged at one end of the traction cable on the peripheral surface of the protective cylinder.

5. The stable silicon carbide pressure sensor according to claim 1, characterized in that: The limiting module includes a locking piece, an O-ring 2 and an O-ring 3. The locking piece is arranged on the inner edge of the protective cylinder. The upper part of the locking piece is defined as a slope section. The lower part of the locking piece is defined as an elastic section. A long strip channel is milled on the elastic section. A convex point pad is arranged on the inner edge of the middle section of the locking piece. The convex point pad touches the raised section 1.

6. The stable silicon carbide pressure sensor according to claim 5, wherein: A concave groove 1 is reserved on the inner edge of the middle section of the locking piece. A concave groove 2 is reserved on the outer edge of the middle section of the locking piece. The concave groove 1 is located near the slope section. The concave groove 2 is located near the elastic section.

7. The stable silicon carbide pressure sensor according to claim 6, wherein: A raised section 1 is arranged on the peripheral wall of the middle section of the docking seat 1. An O-ring 2 is arranged in the concave groove 1. An O-ring 3 is arranged in the concave groove 2.

8. The stable silicon carbide pressure sensor according to claim 1, characterized in that: A sector groove is milled on the inner edge of the protective cylinder. The lower surface of the sector groove is chamfered. The outer contours of the sector groove and the slope section are both 1 / 4 circle.

9. The stable silicon carbide pressure sensor according to claim 5, characterized in that: The inner edge of the lower part of the protective cylinder is defined as a bulging section. The lower part of the docking seat 1 is defined as a raised section 2. The lower edge position of the elastic section abuts against the upper edge position of the raised section 2.

10. The method of using the stable silicon carbide pressure sensor according to claims 1-9, characterized in that, It includes: S1. During assembly, the docking seat 1 is embedded towards the protective cylinder. When the sector piece touches the O-shaped hoop, the O-shaped hoop is rotated. When the retaining cover and the protective cylinder are fully touched, at this time, the O-ring 1 correspondingly touches the inner edge of the circular groove 1. At this time, the O-ring 1 is compressed to prevent the water vapor in the application site from reaching the inside of the retaining cover and the protective cylinder from this position; S2. After the retaining cover and the protective cylinder are connected, gel is added to the access channel. Since the circular groove 3 is circular, the gel can condense into a circular O-shaped gasket. Under the characteristics of the inclined side edge, the characteristics of the O-shaped gasket after condensation can be guaranteed; S3. When the wire harness in the retaining cover is pulled by forces in different directions, relatively slight offsets will occur between the retaining cover and the protective cylinder. Relying on the inclined side, these off-axis forces will be converted into slight swirling forces, that is, regardless of the contact between the retaining cover and the protective cylinder, further reducing the possibility of moisture in the application site reaching the inside of the retaining cover and the protective cylinder; S4. During maintenance, take out the square plate and attach it to the surface of the retaining cover, and at the same time hold the retaining cover and the square plate for swirling operation. When the length of the traction cable is limited, the square plate relies on the traction cable to drive the linkage ring to swirl during the swirling process. During this process, the traction cable damages the O-ring and restricts the O-ring clamp. Under the action of the screw connection, the linkage retaining cover will move towards the outside direction.

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