Sensor

Abstract

The sensor comprises an adapter and a pressure sensing core body, the adapter comprises a limiting groove and a groove, an opening of the limiting groove faces upwards, the pressure sensing core body is at least partially located in the limiting groove, the limiting groove comprises a groove bottom, the groove bottom supports the pressure sensing core body, the groove is sunken downwards from the groove bottom, and the pressure sensing core body is located in the groove. The first side wall of the limiting groove comprises a side contact surface in contact with the pressure sensing core body, the groove comprises a second side wall facing the first side wall, and in the transverse direction of the sensor, the groove comprises an avoiding space between the side contact surface and the second side wall. According to the sensor provided by the invention, the limiting groove of the adapter is in contact with the pressure sensing core body, the possibility that the pressure sensing core body is extruded and broken is reduced or avoided through the avoiding space of the groove between the second side wall and the side contact surface, and the reliability of the pressure sensing core body is improved.

Description

Technical Field

[0001] This invention relates to the field of fluid detection and control technology, and more specifically, to a sensor. Background Technology

[0002] In the sensor, Figure 1 This is a cross-sectional schematic diagram of a sensor in the background art. The sensor includes a housing 1', a carrier 2', a pressure-sensing core 3', a circuit board 4', and a connector 5'. The carrier 2' is located inside the housing 1', and the circuit board 4' is located between the pressure-sensing core 3' and the connector 5'. Figure 2 for Figure 1 A three-dimensional schematic diagram of the carrier base shows that the pressure-sensing core 3' is located in the groove 21' of the carrier base 2'. The sensor includes a pressure channel that connects to the groove 21'. The pressure-sensing core 3' senses the pressure of the medium through the pressure channel and converts the pressure signal of the measured medium into an electrical signal for output. Summary of the Invention

[0003] Based on the sensors in the background technology, during assembly, the edge of the pressure-sensing core must fit snugly against the sidewall of the groove to effectively position the pressure-sensing core on the carrier seat and ensure the reliability of the sensor. The inventors discovered that during the processing and forming of the groove in the carrier seat, the intersection of the groove bottom and the sidewall is rounded or chamfered. During press-fitting of the pressure-sensing core, the presence of these rounded or chamfered corners may cause the edge of the lower surface of the pressure-sensing core to break, affecting the reliability of the pressure-sensing core.

[0004] This invention provides a sensor, including an adapter and a pressure-sensing core. The adapter includes a limiting groove and a recess. The opening of the limiting groove faces upward. The pressure-sensing core is at least partially located in the limiting groove. The limiting groove includes a bottom that supports the pressure-sensing core. The recess is recessed downward from the bottom. A first sidewall of the limiting groove includes a side contact surface that contacts the pressure-sensing core. The recess includes a second sidewall facing the first sidewall. In the transverse direction of the sensor, the recess includes a clearance space between the side contact surface and the second sidewall.

[0005] The sensor provided in this application has a limiting groove of the adapter in contact with the pressure-sensing core. The groove provides clearance space between its second side wall and the side contact surface, thereby reducing or avoiding the possibility of the pressure-sensing core being crushed and improving the reliability of the pressure-sensing core. Attached Figure Description

[0006] Figure 1 Background Art: A cross-sectional schematic diagram of a sensor;

[0007] Figure 2 : Figure 1 A three-dimensional schematic diagram of the carrier base;

[0008] Figure 3 A cross-sectional schematic diagram of a sensor provided by the present invention;

[0009] Figure 4 : Figure 3 A schematic diagram of the explosion of the sensor in the middle;

[0010] Figure 5 : Figure 3 Enlarged view of point A in the middle;

[0011] Figure 6 : Figure 3 3D exploded view of the transfer connector and pressure sensing core;

[0012] Figure 7 : Figure 6 Enlarged view of point B in the middle;

[0013] Figure 8 : Figure 7 Top view diagram;

[0014] Figure 9 : Figure 8 A cross-sectional view of CC.

[0015] Figure 10 : Figure 3 Cross-sectional schematic diagram of the transfer connector and pressure sensing core;

[0016] Figure 11 : Figure 3 A three-dimensional schematic diagram of the central base;

[0017] Figure 12 : A cross-sectional schematic diagram of another sensor provided by the present invention;

[0018] Figure 13 : Figure 12 A three-dimensional schematic diagram of the transfer connector;

[0019] Figure 14 : Figure 12 Cross-sectional view of the transfer connector;

[0020] Figure 15 : Figure 14 Enlarged diagram of point D in the middle.

[0021] Figure 3-15 The attached figures are labeled as follows:

[0022] 1-Base, 100-Inner cavity, 101-Drainage channel, 102-Lower port, 103-Upper port, 111-Cavity bottom

[0023] 2-Adapter, 201-Pressure-sensing channel, 202-Pressure-sensing groove, 203-Receiving groove, 21-Limiting groove, 211-First sidewall, 2111-Second limiting surface, 212-Groove bottom, 213-Second corner, 214-Outward expansion, 215-Outward protrusion, 2151-Guide, 2152-First limiting surface, 2153-Arc-shaped portion, 22 / 22a / 22b-Groove, 22a1-First extension wall, 22a2-Second extension wall, 22a3-Lower extension surface, 221-Groove bottom wall, 222-Second sidewall, 23-Electrical connection piece,

[0024] 3-Pressure-sensitive core, 301-Core sidewall, 302-Bottom wall, 303-First corner, 304-Angle, 31-Pressure-sensitive thick sheet, 32-Pressure-sensitive thin sheet

[0025] 4-Circuit board,

[0026] 5-Connectors

[0027] 6-Sealing component, 61-Sealing ring,

[0028] 7-Temperature sensing element, 71-Pin,

[0029] 8-Protective sleeve, 80-Cavity,

[0030] a-side contact surface. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the accompanying drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The directional terms such as "up" and "down" used herein are... Figure 3 The positions of the components shown are defined only for clarity and convenience in expressing the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0032] Figure 3 A cross-sectional schematic diagram of a sensor provided by the present invention; Figure 4 for Figure 3 A schematic diagram of the explosion of the sensor in the middle; Figure 5 for Figure 3 Enlarged view of point A in the middle; Figure 6 for Figure 3 3D exploded view of the transfer connector and pressure sensing core; Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 for Figure 7Top view diagram; Figure 9 for Figure 8 A cross-sectional view of CC. Figure 10 for Figure 3 Cross-sectional schematic diagram of the transfer connector and pressure sensing core; Figure 11 for Figure 3 A three-dimensional schematic diagram of the central base.

[0033] It should be noted that, with Figure 3 For example, the longitudinal direction of the sensor is the axis of the base 1 and the adapter 2 described below, and the transverse direction of the sensor is the radial direction of the adapter 2 described below.

[0034] As shown in the figure, the sensor in this embodiment can be applied to refrigeration systems such as thermal management systems for new energy vehicles, HVAC systems, refrigeration and cold storage systems, chiller units, heat pump units, automotive air conditioning systems, and marine refrigeration and cold storage systems. The sensor in this embodiment includes a base 1, an adapter 2, a pressure-sensing core 3, a circuit board 4, a connector 5, and a sealing component 6. The base 1 is machined from metal and includes an inner cavity 100 with an opening at the top. The adapter 2 is located within this inner cavity 100, and the bottom 111 of the inner cavity 100 supports the adapter 2. In this embodiment, the outer contour of the adapter 2's cross-section is approximately circular, but it can also be other shapes. The connector 5 is partially located within the inner cavity 100, and the connector 5, adapter 2, and base 1 are fixedly connected by riveting.

[0035] The circuit board 4 is located between the connector 5 and the pressure sensing core 3. The connector 5 and the circuit board 4, and the pressure sensing core 3 and the circuit board 4 can be electrically connected by welding, bonding, or other methods to achieve electrical connection, thereby enabling signal transmission.

[0036] The sensor also features temperature sensing capabilities. Specifically, it includes a temperature sensing element 7 and a protective sleeve 8. The protective sleeve 8 is connected to the adapter 2. The temperature sensing element 7 is located within the cavity 80 of the protective sleeve 8, and the protective sleeve 8 is at least partially located within the drainage channel 101. The protective sleeve 8 isolates the cavity 80 from the drainage channel 101. Therefore, the two pins 71 of the temperature sensing element 7 do not directly contact the medium to prevent short-circuiting of the pins 71 due to conductive impurities in the medium, which could affect the sensor's reliability. The temperature sensing element 7 has two pins 71, which are electrically connected to the temperature sensing element 7. The sensor also includes an electrical connecting piece 23. The adapter 2 is injection molded, with a portion of the electrical connecting piece 23 serving as an insert in the injection-molded adapter 2. During assembly, the portion of the electrical connecting piece 23 extending out of the adapter 2 is soldered to the pins 71. This design ensures that the high temperature generated during the injection molding of the adapter 2 does not affect the performance of the temperature sensing element 7.

[0037] In this embodiment, the adapter 2 includes a limiting groove 21 and a recess 22. The opening of the limiting groove 21 faces upward, and the pressure-sensing core 3 is at least partially located in the limiting groove 21. The limiting groove 21 includes a groove bottom 212 that supports the pressure-sensing core 3. The recess 22 is recessed downward from the groove bottom 212. The first sidewall 211 of the limiting groove 21 includes a side contact surface a that contacts the pressure-sensing core 3. The recess 22 includes a second sidewall 222 facing the first sidewall 211. In the transverse direction of the sensor, the recess 22 includes a clearance space between the side contact surface a and the second sidewall 222. The limiting groove 21 of the adapter 2 contacts the pressure-sensing core 3. The clearance space between the second sidewall 222 of the recess 22 and the side contact surface a reduces or avoids the possibility of the pressure-sensing core 3 being crushed, thereby improving the reliability of the pressure-sensing core 3.

[0038] Regarding the reasons for the breakage of the pressure-sensitive core in the background technology, the specific aspects include the following:

[0039] On the one hand, due to limitations in processing technology, different processes have limited ability to handle the angles at the intersections of planes on parts. For example, in processes such as injection molding, chamfers or fillets are unavoidable at the intersections of planes on the mold. Similarly, in metal cutting, the radius and shape of the cutting tool directly affect the shape of the machined edges. For the angles at the intersections of planes, the cutting tool may not be able to perfectly fit and remove all material, inevitably leaving small chamfers or fillets.

[0040] On the other hand, when the sensor is installed in the target system, under extreme conditions such as high and low temperature shocks, the high temperature thermal expansion coefficient of the adapter is inconsistent with the expansion coefficient of the pressure-sensing core made of ceramic material, which causes the edges and corners of the ceramic core to be crushed and broken, thus affecting the long-term reliability of the pressure-sensing core.

[0041] In this embodiment, the pressure-sensitive core 3 is a ceramic core.

[0042] Based on this, during assembly, the pressure-sensitive core 3 has its core sidewall 301 in contact with the side contact surface a, which can effectively restrict the lateral degree of freedom of the pressure-sensitive core 3, thereby improving the positioning accuracy of the pressure-sensitive core 3. This helps to ensure that the pressure-sensitive core 3 maintains the correct position during the pressing process and reduces assembly problems caused by positional deviations.

[0043] It should be noted that the groove 22 can reduce or prevent the intersection of the core side wall 301 and the bottom wall 302 of the pressure-sensing core 3 from being broken, thereby improving the reliability of the pressure-sensing core 3 and thus improving the pass rate and production efficiency of the solenoid valve.

[0044] In this embodiment, the adapter 2 is preferably formed by injection molding. The following description will focus on the adapter 2 as an injection molded part. Regarding the groove 22, it should be noted that its size is related to the size of the chamfer or fillet. This is to reduce or prevent interference-induced damage to the pressure-sensing core 3. Due to the manufacturing process, the size of the chamfer or fillet may vary slightly. However, the chamfer or fillet size is typically at least 0.05mm-0.5mm. Therefore, the size of the groove 22 must be larger than the chamfer or fillet size to ensure the reliability of the pressure-sensing core 3.

[0045] Specifically, the side contact surface a extends downward to form part of the groove wall of the groove 22. The distance between the side contact surface a and the second side wall 222 is defined as L1, which satisfies L1≥0.05mm. In this embodiment, the size range of L1 preferably satisfies 0.05≤L1≤0.5mm. The intersection of the core side wall 301 and the bottom end wall 302 of the pressure-sensitive core 3 has a first corner portion 303. The first corner portion 303 is located in the clearance space, that is, above the groove 22, so as to ensure the integrity of the pressure-sensitive core 3 when the bottom end wall 302 is abutting against the groove bottom 212, and reduce or avoid the first corner portion 303 of the pressure-sensitive core 3 being interfered with and broken due to the aforementioned chamfering or rounding issues.

[0046] Specifically, the groove 22 includes a bottom wall 221, a contact surface a on the transverse connection side of the sensor, and a second side wall 222. In the longitudinal direction of the sensor, the distance between the groove bottom 212 and the bottom wall 221 is defined as H, which satisfies H ≥ 0.05 mm. This clearance space effectively avoids the first corner 303, further preventing the possibility of the first corner 303 being interfered with and broken in the longitudinal direction of the sensor due to chamfering or rounding issues. It is understood that the maximum limit of H can be the distance from the groove bottom 212 to the bottom end of the adapter 2. Of course, in this embodiment, the dimension of H preferably satisfies 0.05 ≤ H ≤ 0.5 mm. This depth dimension ensures that the first corner 303 will not be interfered with and is also beneficial for the manufacturing of plastic injection molds and injection molding production.

[0047] The pressure-sensitive core 3 has a polygonal cross-section, meaning it has at least three sides. In this embodiment, the pressure-sensitive core 3 is combined with... Figure 6 As shown, the cross-section of the pressure-sensitive core 3 is preferably rectangular, but it can also be circular or other shapes. The cross-sectional shape of the limiting groove 21 is adapted to the pressure-sensitive core 3. The cross-section of the first sidewall 211 is quadrilateral, and there are four first sidewalls 211.

[0048] Figure 12A cross-sectional schematic diagram of another sensor provided by the present invention; Figure 13 for Figure 12 A three-dimensional schematic diagram of the transfer connector; Figure 14 for Figure 12 Cross-sectional view of the transfer connector; Figure 15 for Figure 12 Enlarged diagram of point D in the middle.

[0049] As an example, regarding the groove 22b specifically, the groove 22b is arranged around the first sidewall 211, and the pressure-sensitive core 3 is the same. Figure 6 As shown, its cross-section is rectangular, and the groove 22b is rectangularly arranged in the longitudinal projection direction of the sensor. The first sidewall 211 includes a second limiting surface 2111, which serves as a side contact surface a. While reducing or avoiding the possibility of the pressure-sensitive core 3 being crushed by creating clearance space, in this example, the core sidewall 301 of the pressure-sensitive core 3 abuts against the second limiting surface 2111, resulting in a large-area contact between the pressure-sensitive core 3 and the adapter 2, thereby improving the stability and reliability of the pressure-sensitive core 3.

[0050] Meanwhile, the second limiting surface 2111 helps to disperse stress and reduce the risk of the pressure-sensitive core 3 falling off due to external force.

[0051] like Figure 6-9 As shown, in this embodiment, the first sidewall 211 includes an outward protrusion 215, which protrudes from the first sidewall 211 toward the pressure-sensitive core 3. The outward protrusion 215 toward the pressure-sensitive core 3 includes a first limiting surface 2152, which serves as a side contact surface a. The outward protrusion 215 employs a rib, which not only facilitates the injection molding of the adapter 2 and ensures the accuracy of dimensional tolerance control for the outward protrusion 215, but also further improves the assembly accuracy of the pressure-sensitive core 3.

[0052] It should also be noted that if there are burrs or warping deviations on the edge of the pressure-sensing core 3, it will also cause the pressure-sensing core 3 to not effectively fit the adapter 2, resulting in assembly accuracy errors. This can lead to edge breakage of the pressure-sensing core 3 during assembly, consequently resulting in low sensor production efficiency and yield. Therefore, this embodiment, compared to... Figure 13 In the example, the contact area between the pressure-sensing core 3 and the adapter 2 is reduced by the outward protrusion 215. While ensuring effective positioning of the pressure-sensing core 3, the possibility of the pressure-sensing core 3 being squeezed and broken by the adapter 2 is not increased due to the large change in the planar dimensions of the first sidewall 211 of the limiting groove 21 (due to the large change in dimensions caused by thermal expansion and contraction of materials or other factors), thus ensuring the reliability of the pressure-sensing core 3.

[0053] Among them, each first side wall 211 includes at least two convex portions 215. In this way, the adapter base 2 contacts the pressure-sensitive core 3 through the convex portions 215 on the peripheral side walls of the limiting groove 21, so as to further reduce the contact surface area between the pressure-sensitive core 3 and the adapter base 2, and further improve the reliability of the pressure-sensitive core 3 while ensuring the effective positioning of the pressure-sensitive core 3.

[0054] Among them, as an injection-molded part, the convex portion 215 is integrally injection-molded with the adapter base 2. To improve the convenience of injection molding, the convex portion 215 extends upward from the bottom wall 221 of the groove 22a, and the groove 22a is arranged around the convex portion 215. With such an arrangement, while facilitating the injection molding of the adapter base 2, interference can be effectively avoided. Specifically, the groove 22a includes a first extended wall 22a1 and a second extended wall 22a2. The outer contour of the cross-section of the adapter base 2 is approximately circular. In the circumferential direction of the adapter base 2, the first extended wall 22a1 and the second extended wall 22a2 are oppositely arranged, and there is a gap between the first extended wall 22a1 and the outer surface of the convex portion 215, and there is a gap between the second extended wall 22a1 and the outer surface of the convex portion 215.

[0055] Among them, the first side wall 211 includes a lower extension surface 22a3, and the lower extension surface 22a3 forms another part of the groove wall of the groove 22a. The lower extension surface 22a3 is connected to the first extended wall 22a1 and the second extended wall 22a2, so as to make the injection molding of the adapter base 2 more convenient. As Figure 7 shown, the shape of the groove 22a can change with the shape of the first side wall 211 or the shape of the convex portion 215. The groove 22a can prevent the second corner portion 213 at the intersection of the first side wall 211 and the bottom 212 from interfering with the first corner portion 303. Taking Figure 8 the perspective in it as an example, the groove 22a can be a concave-shaped square groove, or can also be a circular or other-shaped groove.

[0056] In Figure 8 the perspective, the distance between the lower extension surface 22a3 and the first limiting surface 2152 is L2, and L2≥0.05mm is satisfied. Thus, the reliability of the pressure-sensitive core 3 can be further ensured through the avoidance space.

[0057] As Figure 7 shown, in this embodiment, the convex portion 215 includes a guiding portion 2151. The top surface part of the convex portion 215 is flush with the top surface of the adapter base y. In the longitudinal direction of the sensor, the guiding portion 2151 slopes downward from the top surface of the convex portion 215. The end of the guiding portion 2151 close to the pressure-sensitive core 3 is lower than the end of the guiding portion 2151 far from the pressure-sensitive core 3. The guiding portion 2151 can provide assembly guidance for the pressure-sensitive core 3 during the press-fitting of the pressure-sensitive core 3, which is more conducive to the assembly of the pressure-sensitive core 3.

[0058] like Figure 7 As shown, in this embodiment, the protruding portion 215 includes an arc-shaped portion 2153, which is located at the end facing the pressure-sensitive core 3. The arc-shaped portion 2153 extends longitudinally in the sensor and is transitionally connected to the first limiting surface 2152. This avoids the sharp portion between the sidewall of the protruding portion 215 and the first limiting surface 2152 from scratching the edge of the pressure-sensitive core 3, thereby further ensuring the reliability of the pressure-sensitive core 3.

[0059] The pressure-sensing core 3 includes the aforementioned core sidewalls 301 and an included angle portion 304. The cross-section of the pressure-sensing core 3 is rectangular. The included angle portion 304 is located at the intersection between adjacent core sidewalls 301. A limiting groove 21 cooperates with the pressure-sensing core 3. The limiting groove 21 includes an outwardly expanding portion 214 located between adjacent first sidewalls 211. In the longitudinal projection direction of the sensor, the outwardly expanding portion 214 and the included angle portion 304 are opposite to each other, and the included angle portion 304 and the outwardly expanding portion 214 do not contact each other. This further prevents the included angle portion 304 of the pressure-sensing core 3 from being damaged, thereby improving the reliability of the pressure-sensing core 3.

[0060] The dimensions and position of the limiting groove 21 are based on the standard that the pressure-sensing core 3 does not protrude from the outer circumferential surface of the adapter 2 after installation. The position of the limiting groove 21 can be adjusted accordingly according to design requirements. Figure 6 For example, the limiting groove 21 is located at a non-central position of the adapter 2, and the outward expansion 214 can be an arc-shaped groove in the longitudinal direction of the sensor. The outward expansion 214 can also be a spacer segment communicating with the circumferential outer ring surface in the longitudinal direction of the sensor. Secondly, with... Figure 13 For example, the limiting groove 21 is located at the center of the adapter 2, and the expansion portion 214 can be an arc-shaped groove in the longitudinal direction of the sensor. Through the separation of the expansion portion 214, the adjacent first sidewalls 211 are continuous surfaces that are not directly connected, further ensuring the reliability of the pressure-sensing core 3.

[0061] like Figure 5 As shown, the sensor also includes a sealing component 6, which includes a sealing ring 61. The adapter 2 includes a receiving groove 203, which is recessed from the bottom 212 toward the side away from the pressure-sensing core 3. The groove 22 is located on the periphery of the receiving groove 203, and the sealing ring 61 is located in the receiving groove 203. The bottom 212 is flat, and the pressure-sensing core 3 includes a bottom wall 302, which is flat. The bottom wall 302 partially fits against the bottom 212 and partially presses against the sealing ring 61. The sealing ring 61 ensures effective isolation between the inside of the sensor and the external environment, preventing the detection medium from entering the inside of the sensor and causing leakage.

[0062] Combination Figure 5As shown, the pressure-sensing core 3 includes a pressure-sensing thick sheet 31 and a pressure-sensing thin sheet 32. The pressure-sensing thick sheet 31 is located above the pressure-sensing thin sheet 32 ​​and is connected to the pressure-sensing thin sheet 32. The base 1 includes a drainage channel 101, which has a lower port 102 and an upper port 103. The lower port 102 is located on the bottom end face of the base 1, and the upper port 103 is located at the bottom of the cavity 111. The adapter 2 includes a pressure-sensing channel 201 and a pressure-sensing groove 202. The groove opening of the pressure-sensing groove 202 faces upward. The pressure-sensing channel 201 connects the pressure-sensing groove 202 and the drainage channel 101. The receiving groove 203 is located around the pressure-sensing groove 202. The cross-sectional area of ​​the pressure-sensing groove 202 is larger than that of the pressure-sensing channel 201, which increases the contact area between the medium and the pressure-sensing thin sheet 32, thereby shortening the time required for the sensor to reach a stable output signal from the start of sensing a pressure change.

[0063] It should be noted that the pressure-sensing channel 201 has an upper channel opening and a lower channel opening. The upper channel opening is connected to the pressure-sensing groove 202, and the lower channel opening can be located longitudinally at the lower part of the adapter 2 (e.g., Figure 10 As shown in the diagram, the lower channel opening can also be located laterally on the side of the adapter 2 (as shown in the diagram). Figure 14 As shown in the figure, the medium is guided to the pressure-sensing groove 202 through the drainage channel 101 and the pressure-sensing channel 201. The pressure-sensing sheet 32 ​​deforms when subjected to pressure, and outputs a pressure signal after the deformation is generated and connected to the circuit board 4.

[0064] The technical features of the above embodiments can be combined. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A sensor, characterized in that, The sensor includes an adapter (2) and a pressure-sensing core (3). The adapter (2) includes a limiting groove (21) and a recess (22). The opening of the limiting groove (21) faces upward. The pressure-sensing core (3) is at least partially located in the limiting groove (21). The limiting groove (21) includes a groove bottom (212) that supports the pressure-sensing core (3). The recess (22) is recessed downward from the groove bottom (212). The first sidewall (211) of the limiting groove (21) includes a side contact surface (a) that contacts the pressure-sensing core (3). The recess (22) includes a second sidewall (222) facing the first sidewall (211). In the transverse direction of the sensor, the recess (22) includes a clearance space between the side contact surface (a) and the second sidewall (222).

2. The sensor according to claim 1, characterized in that, The side contact surface (a) extends downward to form part of the groove wall of the groove (22). The distance between the side contact surface (a) and the second side wall (222) is defined as L1, which satisfies L1≥0.05mm.

3. The sensor according to claim 1 or 2, characterized in that, The first sidewall (211) includes an outward protrusion (215), which protrudes from the first sidewall (211) toward the pressure-sensitive core (3). The outward protrusion (215) toward the pressure-sensitive core (3) includes a first limiting surface (2152), which serves as the side contact surface (a).

4. The sensor according to claim 3, characterized in that, The groove (22a) includes a first extension wall (22a1) and a second extension wall (22a2). In the circumferential direction of the adapter (2), the first extension wall (22a1) and the second extension wall (22a2) are disposed opposite to each other. There is a gap between the first extension wall (22a1) and the outer surface of the protrusion (215), and there is a gap between the second extension wall (22a1) and the outer surface of the protrusion (215).

5. The sensor according to claim 4, characterized in that, The first sidewall (211) includes a lower extension surface (22a3), which forms another part of the groove wall of the groove (22a), and the lower extension surface (22a3) is connected to the first extension wall (22a1) and the second extension wall (22a2).

6. The sensor according to claim 3, characterized in that, The pressure-sensitive core (3) has a rectangular cross-section, and the limiting groove (21) has a rectangular cross-section. The limiting groove (21) includes four first sidewalls (211), and the first sidewalls (211) include at least two of the external protrusions (215). The external protrusions (215) include guide portions (2151), and the end of the guide portion (2151) near the pressure-sensitive core (3) is lower than the end of the guide portion (2151) away from the pressure-sensitive core (3).

7. The sensor according to claim 1 or 2, characterized in that, The groove (22b) is arranged around the first sidewall (211), the first sidewall (211) includes a second limiting surface (2111), the second limiting surface (2111) serves as the side contact surface (a).

8. The sensor according to any one of claims 1-7, characterized in that, The groove (22) includes a bottom wall (221). In the longitudinal direction of the sensor, the distance between the bottom (212) of the groove and the bottom wall (221) of the groove is defined as H, which satisfies H≥0.05mm.

9. The sensor according to any one of claims 1-7, characterized in that, The pressure-sensitive core (3) has a polygonal cross-section. The pressure-sensitive core (3) includes a core sidewall (301) and an included angle portion (304). The core sidewall (301) contacts the side contact surface (a). The included angle portion (304) is located at the intersection between adjacent core sidewalls (301). The limiting groove (21) includes an outward expansion portion (214) located between adjacent first sidewalls (211). In the longitudinal projection direction of the sensor, the outward expansion portion (214) is opposite to the included angle portion (304). The included angle portion (304) does not contact the outward expansion portion (214).

10. The sensor according to any one of claims 1-7, characterized in that, It also includes a sealing component (6), the sealing component (6) including a sealing ring (61), the adapter (2) including a receiving groove (203), the receiving groove (203) being recessed from the bottom of the groove (212) toward the side away from the pressure-sensing core (3), the groove (22) being located around the receiving groove (203), and the sealing ring (61) being located in the receiving groove (203); The bottom of the groove (212) is a plane, and the pressure-sensitive core (3) includes a bottom wall (302). The bottom wall (302) is a plane, and the bottom wall (302) partially fits the bottom of the groove (212) and partially presses against the sealing ring (61).

11. The sensor according to claim 10, characterized in that, The pressure-sensing core (3) is a ceramic core. The sensor also includes a base (1). The adapter (2) is located in the inner cavity (100) of the base (1). The base (1) includes a drainage channel (101). The adapter (2) includes a pressure-sensing channel (201) and a pressure-sensing groove (202). The pressure-sensing groove (202) is located below the pressure-sensing core (3). The cross-sectional area of ​​the pressure-sensing groove (202) is larger than the cross-sectional area of ​​the pressure-sensing channel (201). The pressure-sensing channel (201) connects the pressure-sensing groove (202) and the drainage channel (101). The receiving groove (203) is located around the pressure-sensing groove (202). The sensor also includes a temperature-sensitive element (7) and a protective sleeve (8). The protective sleeve (8) is connected to the adapter (2). The sensor also includes an electrical connector (23). The temperature-sensitive element (7) is electrically connected to the portion of the electrical connector (23) that extends out of the adapter (2). The temperature-sensitive element (7) is located in the cavity (80) of the protective sleeve (8). The protective sleeve (8) isolates the cavity (80) from the drainage channel (101).

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