Sensor

Abstract

A sensor disclosed by the present invention comprises a shell, a connecting seat, a temperature sensing unit, an isolation member and a first sealing member, the connecting seat is fixedly connected with the shell, the temperature sensing unit comprises two pins and a temperature sensing element, the pins are fixedly connected with the connecting seat and electrically connected with the temperature sensing element, the shell comprises a circulation hole, the temperature sensing element is electrically connected with the circulation hole, and the temperature sensing element is electrically connected with the temperature sensing element. The isolation piece comprises a body part and an extension part, at least part of the body part is located in the circulation hole, the body part comprises a bottom, the temperature sensing element and part of the pins are located in the body part, the extension part is annular, the first sealing piece is located above the extension part, the first sealing piece is arranged around the circulation hole, and the connecting base abuts against the first sealing piece in the longitudinal direction of the sensor; the first sealing piece abuts against the extension part, and the extension part abuts against the shell. The isolation piece, the temperature sensing element and part of the pins are arranged in the body part, the first sealing piece is pressed through the connecting seat, the first sealing piece is pressed through the extension part, and the extension part is pressed through the shell, so that isolation between the pins and the tested fluid is realized.

Description

Technical Field

[0001] This invention relates to the field of sensing technology, and in particular to a sensor. Background Technology

[0002] Sensors are an important component in industrial automation control systems. They are used to sense the measured information and convert it into electrical signals or other required forms of output information according to certain rules. With the continuous development of science and technology, sensors are being used in more and more widespread areas of daily life.

[0003] Figure 1 This is a cross-sectional schematic diagram of a sensor provided for background art. In this structure, the sensor includes a temperature sensing device 01, which includes a temperature probe 011 and two pins 012 electrically connected to the temperature probe 011. During actual use, the presence of conductive impurities in the medium may cause short-circuit failure of the two pins 012, affecting the sensor's operational reliability. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a sensor comprising: a housing, a connector, a temperature sensing unit, an isolator, and a first sealing member. The connector is fixedly connected to the housing. The temperature sensing unit includes pins and a temperature sensing element. The pins are fixedly connected to the connector and electrically connected to the temperature sensing element. The number of pins includes two. The housing includes a flow hole. The isolator includes a body portion and an extension portion. At least a portion of the body portion is located within the flow hole. The body portion includes a bottom. The temperature sensing element and a portion of the pins are located within the body portion. The extension portion extends outward from the body portion along the transverse direction of the sensor and is annular. The first sealing member is located above the extension portion along the longitudinal direction of the sensor. The connector abuts against the first sealing member, the first sealing member abuts against the extension portion, and the extension portion abuts against the housing.

[0005] This application achieves isolation between the pins and the fluid being measured by setting up an isolation component, which includes a body and an extension portion. The temperature sensing element and some pins are located inside the body and are connected to a connector that presses against a first seal, which in turn presses against the extension portion, which in turn presses against the housing. This reduces the risk of pin short circuits. Attached Figure Description

[0006] Figure 1 This is a cross-sectional schematic diagram of a sensor in the background art;

[0007] Figure 2 A cross-sectional schematic diagram of a sensor provided by the present invention;

[0008] Figure 3a for Figure 2 Enlarged view of point X in the middle;

[0009] Figure 3b for Figure 3a Enlarged view of point Y in the middle;

[0010] Figure 4 for Figure 2 A three-dimensional structural diagram of the middle shell;

[0011] Figure 5 for Figure 2 A three-dimensional structural diagram of the connecting seat;

[0012] Figure 6 for Figure 2 Exploded view of the connecting seat, temperature sensing unit, first seal and isolation component;

[0013] Figure 7 This is a schematic diagram of a three-dimensional structure of another type of shell. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0015] In embodiments of the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0016] The directional terms mentioned in the embodiments of this invention, such as "up," "down," "inner," "outer," "left," and "right," are for reference only. Figure 2 The directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0017] Figure 2 A cross-sectional schematic diagram of a sensor provided by the present invention; Figure 3a for Figure 2 Enlarged view of point X in the middle; Figure 3b for Figure 3a Enlarged view of point Y in the middle; Figure 4 for Figure 2 A three-dimensional structural diagram of the middle shell; Figure 5 for Figure 2 A three-dimensional structural diagram of the connecting seat; Figure 6 for Figure 2 Exploded view of the connecting seat, temperature sensing unit, first seal and isolation component.

[0018] As shown in the figure, the sensor in this embodiment includes a housing 1, a connector 2, a temperature sensing unit 3, an isolator 5, a socket 6, a first sealing member 71, and a circuit board 8. The housing 1 is machined from metal and includes a stepped portion 14 with the stepped surface facing upwards. The connector 2 is placed on the stepped portion 14, and the socket 6 is partially located inside the housing 1. The socket 6, connector 2, and housing 1 are fixedly connected by a riveting process. The socket 6 includes a pin 61, which is electrically connected to the circuit board 8. The temperature sensing unit 3 includes a pin 31 and a temperature sensing element 32. In this embodiment, the pin 31 includes a tab 311 and a lead wire 312. The tab 311 is fixedly connected to the connector 2 by injection molding, and the tab 311 is welded to the lead wire 312. The upper section of the tab 311 is electrically connected to the circuit board 8, and the lower section of the tab 311 is electrically connected to the lead wire 312 by welding. The lead wire 312 is electrically connected to the temperature sensing element 32. Pin 31 adopts a split structure, and the insert 311 can be used as an insert injection molding connector 2. During assembly, the insert 311 is then soldered to the lead wire 312. With this setting, the high temperature heat during injection molding of the connector 2 will not affect the performance of the temperature sensing element 32.

[0019] The housing 1 includes a flow hole 11, which serves as an inlet channel for the fluid being measured. The stepped surface 141 of the stepped portion 14 is connected to the wall of the flow hole 11. The isolation member 5 is formed by stamping and / or stretching of a metal material (e.g., a thin stainless steel sheet). Using a thin sheet stamping and / or stretching process facilitates forming and, since the temperature sensing element 32 is located within its cavity, the thin sheet processing ensures the response time of the temperature sensing element 32. Specifically, the isolation member 5 includes a body portion 51 and an extension portion 52. The body portion 51 is a bottomed cylindrical shape and is at least partially located within the flow hole 11. The body portion 51 includes a bottom 511, and the temperature sensing element 32 is located near the bottom 511. The extension portion 52 extends outward from the body portion 51 along the transverse direction of the sensor. The extension portion 52 is annular and is positioned on the stepped surface 141 of the stepped portion 14. In this embodiment, the first sealing element 71 is an O-ring, located above the extension portion 52, and surrounding the flow hole 11. Along the longitudinal direction of the sensor, the connecting seat 2 presses against the first sealing element 71, the first sealing element 71 presses against the extension portion 52, and the extension portion 52 presses against the stepped portion 14 of the housing 1.

[0020] In this embodiment, by setting the isolation member 5 and the first sealing member 71, and with the temperature sensing element 32 and part of the pins 31 located inside the body part 51, and by the connecting seat 2 pressing against the first sealing member 71, the first sealing member 71 pressing against the extension part 52, and the extension part 52 pressing against the step part 14 of the housing 1, the pins 31 are isolated from the fluid being measured, thereby reducing the risk of pin short circuit.

[0021] As one specific implementation method, such as Figure 2 , Figure 3a , Figure 3b and Figure 6 As shown, the connecting seat 2 includes a groove 21 with its opening facing downwards. At least part of the extension portion 52 of the isolator 5 is located within the groove 21. Laterally, the outer peripheral surface 521 of the extension portion 52 is in clearance fit or tight fit with the groove wall of the groove 21. The groove wall of the groove 21 restricts the displacement of the extension portion 52 along the lateral direction of the sensor. Reducing the lateral displacement of the isolator 5 along the sensor ensures the sealing effect of the first sealing member 71 and maintains a gap between the wall of the flow hole 11 and the body portion 51 of the isolator 5, allowing fluid to pass through this gap to the area below the pressure sensing unit 4. Furthermore, the bottom of the groove 21 has a first annular groove 211 with its opening facing downwards. The first sealing member 71 is located within this first annular groove 211. By setting the first annular groove 211, the position of the first sealing member 71 is restricted, thereby ensuring the reliability of the seal between the connecting seat 2 and the extension portion 52.

[0022] like Figure 2 , Figure 3a , Figure 3b and Figure 5 As shown, the sensor in this embodiment also includes a pressure sensing unit 4 for sensing fluid pressure, which is electrically connected to the circuit board 8. The connector 2 also includes a receiving groove 22 with its opening facing upwards. The pressure sensing unit 4 is at least partially located in the receiving groove 22. The connector 2 has a cavity 23 located below the pressure sensing unit 4. The cavity 23 ensures sufficient contact area between the fluid and the lower surface of the pressure sensing unit 4, thereby improving the response speed of the pressure sensing unit 4. Furthermore, the sensor includes a connecting channel P, which connects the cavity 23 and the flow hole 11, allowing the measured fluid to reach the cavity 23 through the flow hole 11 and the connecting channel P.

[0023] like Figure 2 , Figure 3a , Figure 3bAs shown, there is a gap P1 between the body 51 of the isolator 5 and the wall of the flow hole 11, and the connecting channel P connects the gap P1 and the cavity 23. The gap P1 is part of the pressure sensing channel, and only the outer diameter of the body 51 of the isolator 5 and the inner diameter of the flow hole 11 need to be set, without the need for additional processing steps, and the structure is simple.

[0024] The specific structure of the connecting channel P is as follows: Figure 3a , Figures 3b to 5 As shown in the specific embodiment, the housing 1 includes an extension groove 12. The extension groove 12 extends laterally outward from the flow hole 11 along the sensor. The extension groove 12 is formed by recessing from the stepped surface 141 of the stepped portion 14, and communicates with the gap P1. Part of the extension groove 12 is located below the extension portion 52, and another part of the extension groove 12 is located laterally outside the extension portion 52. That is, in the longitudinal direction of the sensor, the extension portion 52 only covers part of the extension groove 12. The communicating channel P also includes the extension groove 12. In the longitudinal direction of the sensor, the extension groove 12 is not completely covered by the extension portion 52, thereby ensuring the unobstructed flow of the pressure sensing channel.

[0025] Furthermore, such as Figure 3a , Figure 3b , Figure 5 As shown, the connecting seat 2 has a drainage hole 24. One end opening 241 of the drainage hole 24 is located on the cavity wall of the cavity 23. Here, the "cavity wall" includes the bottom wall and the peripheral wall forming the cavity 23. The drainage hole 24 communicates with the cavity 23. In the transverse direction of the sensor, the other end opening 242 of the drainage hole 24 is located on the outside of the first sealing member 71. The other end opening 242 of the drainage hole 24 communicates with the aforementioned extension groove 12. The connecting channel P also includes the drainage hole 24.

[0026] In summary, the connecting channel P includes an extension groove 12 and a drainage hole 24. The fluid being measured passes through the gap P1, the extension groove 12, and the drainage hole 24 to reach the cavity 23 below the pressure sensing unit 4.

[0027] like Figure 3a , Figure 3b As shown, the connector 2 in this embodiment also includes a protrusion 26, which is located outside the extension 52 in the transverse direction of the sensor. Figure 4 As shown, the extension groove 12 is elongated, and the protrusion 26 is at least partially located in the extension groove 12. The protrusion 26 can abut against the groove wall of the extension groove 12 to restrict the rotation of the connecting seat 2 relative to the housing 1. By limiting the relative position of the connecting seat 2 and the housing 1, the relative position of the drainage hole 24 and the extension groove 12 is ensured, thereby ensuring the unobstructed flow of the communication channel P and improving the reliability of the sensor in sensing pressure.

[0028] Figure 7 This is a schematic diagram of a three-dimensional structure of another type of shell.

[0029] The difference between this embodiment and the above embodiments is that the isolation member 5 is tightly fitted with the wall of the flow hole 11. Based on this, the housing 1 includes a bypass hole 13 and an extension groove 12', as shown below. Figure 7 As shown, the bypass hole 13 is formed at the wall of the flow hole 11, meaning that the bypass hole 13 is connected to the flow hole 11, and the bypass hole 13 serves as part of the pressure sensing flow channel. The sensor includes a connecting channel P, which connects the cavity 23 and the bypass hole 13, allowing fluid to reach the cavity 23 through the bypass hole 13 and the connecting channel P. The specific structure of the extension groove 12' is the same as in the above embodiment, with the upper port of the bypass hole 13 located at the bottom of the extension groove 12', and the bypass hole 13 communicating with the extension groove 12'. The bypass hole 13 is machined, making it easy to manufacture.

[0030] In this embodiment, the isolation member 5 is tightly fitted with the wall of the flow hole 11 to limit the displacement of the isolation member 5 along the lateral direction of the sensor, eliminating the need for the groove 21 to limit the isolation member 5 in the previous embodiment.

[0031] As an extended embodiment, the bypass hole 13 can also be arranged parallel to the flow hole 11, that is, the bypass hole 13 can be spaced apart from the flow hole 11, the bypass hole 13 and the flow hole 11 are not directly connected, and the bypass hole 13 is part of the pressure sensing channel.

[0032] Further as Figure 3a , Figure 3b , Figure 5 As shown, the connector 2 includes a second annular groove 25, with the opening of the second annular groove 25 facing upwards. Laterally, the second annular groove 25 is located outside the cavity 23; longitudinally, it is located below the pressure sensing unit 4. The sensor also includes a second seal 72, specifically an O-ring, located within the second annular groove 25. Longitudinally, the pressure sensing unit 4 presses against the second seal 72, and the second seal 72 presses against the bottom of the second annular groove 25. This configuration isolates the measured fluid through the second seal 72, preventing it from flowing to the circuit board 8 above the pressure sensing unit 4 after reaching the cavity 23, thus avoiding the risk of a short circuit in the circuit board 8.

[0033] In this embodiment, as Figure 6As shown, the connecting seat 2 includes a seat body 27 and a protrusion 28. The seat body 27 is cylindrical and is placed on the stepped portion 14 of the housing 1, pressing against the first sealing member 71. The protrusion 28 is generally cylindrical and extends downward from the seat body 27 along the longitudinal direction of the sensor. The insert 311 of the aforementioned pin 31 extends downward from the protrusion 28. Furthermore, the outer peripheral wall of the protrusion 28 includes a rib 281, and the protrusion 28 is at least partially located inside the body portion 51, with the rib 281 contacting the inner wall of the body portion 51. With this configuration, when the sensor is assembled, the connecting seat 2 and the isolator 5 can be pre-assembled through the contact between the rib 281 and the inner wall of the body portion 51. After pre-assembly, they form a whole, facilitating subsequent assembly with other components. On the other hand, it eliminates the need for the groove 21 in the aforementioned embodiment to laterally limit the isolator 5.

[0034] Furthermore, such as Figure 2 As shown, a portion of the isolator 5 is located outside the housing 1, and at least a portion of the temperature sensing element 3 is located outside the housing 1, with the temperature sensing element 3 being closer to the bottom 511 than the extension portion 52. Furthermore, the outer surface of the bottom 511 is approximately spherical. This arrangement allows for a large contact area between the portion of the isolator 5 located outside the housing 1 and the fluid being measured, enabling rapid temperature conduction to the temperature sensing element 3 and thus improving the sensing sensitivity of the temperature sensing element 3.

[0035] Of course, as a further embodiment, a thermally conductive medium, such as thermally conductive silicone grease, can be provided between the temperature sensing element 3 and the bottom 511 to further improve the response time of the temperature sensing element 3 in sensing temperature.

[0036] The technical features of the above embodiments can be combined in any way. 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.

[0037] 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 controls without departing from the concept of the present invention, and these modifications and controls all fall within the scope of protection of the present invention.

Claims

1. A sensor, characterized in that, include: The sensor comprises a housing, a connector, a temperature sensing unit, an isolator, and a first seal. The connector is fixedly connected to the housing. The temperature sensing unit includes pins and a temperature sensing element. The pins are fixedly connected to the connector and electrically connected to the temperature sensing element. The number of pins includes two. The housing includes a flow hole. The isolator includes a body portion and an extension portion. At least part of the body portion is located within the flow hole. The body portion includes a bottom. The temperature sensing element and part of the pins are located within the body portion. The extension portion extends outward from the body portion along the transverse direction of the sensor and is annular. The first seal portion is located above the extension portion along the longitudinal direction of the sensor. The connector abuts against the first seal portion, the first seal portion abuts against the extension portion, and the extension portion abuts against the housing.

2. The sensor according to claim 1, characterized in that, The connector includes a groove with the groove opening facing downwards. The extension portion is at least partially located in the groove. In the lateral direction of the sensor, the outer peripheral surface of the extension portion can at least partially contact the groove wall to limit the lateral displacement of the isolator. The bottom of the groove is provided with a first annular groove with the groove opening facing downwards. The first sealing member is located in the first annular groove.

3. The sensor according to claim 1, characterized in that, The connector includes a receiving groove with the groove opening facing upwards. The sensor also includes a pressure sensing unit, which is at least partially located in the receiving groove. The connector has a cavity located below the pressure sensing unit. The sensor includes a communicating channel that connects the cavity to the flow hole.

4. The sensor according to claim 2, characterized in that, In the transverse direction of the sensor, there is a gap between the body portion and the wall of the flow hole, and the communication channel connects the cavity and the gap.

5. The sensor according to claim 4, characterized in that, The housing includes an extension groove that extends laterally outward from the flow hole along the sensor. Along the longitudinal direction of the sensor, a portion of the extension groove is located below the extension portion, and along the transverse direction of the sensor, another portion of the extension groove is located outside the extension portion. The communication channel includes the extension groove.

6. The sensor according to claim 1, characterized in that, The main body is tightly fitted to the wall of the flow hole. The housing also includes a bypass hole, which is connected to or parallel to the flow hole. The sensor includes a connecting channel that connects the cavity and the bypass hole.

7. The sensor according to claim 6, characterized in that, The housing includes an extension groove that extends laterally outward from the bypass hole along the sensor and communicates with the bypass hole. Along the transverse direction of the sensor, a portion of the extension groove is located outside the extension portion, and the communicating channel includes the extension groove.

8. The sensor according to claim 5 or 7, characterized in that, The connector has a drainage hole. One end of the drainage hole is located on the cavity wall of the cavity and communicates with the cavity. In the transverse direction of the sensor, the other end of the drainage hole is located outside the first seal and communicates with the extension groove. The communication channel includes the drainage hole.

9. The sensor according to claim 8, characterized in that, The connector includes a protrusion located on the outer side of the extension portion in the transverse direction of the sensor. The protrusion is at least partially located in the extension groove and is capable of abutting against the groove wall of the extension groove to restrict the connector from rotating relative to the housing.

10. The sensor according to any one of claims 3-7, characterized in that, The connecting seat includes a second annular groove with its opening facing upwards. In the transverse direction of the sensor, the second annular groove is located outside the cavity. The sensor also includes a pressure sensing unit and a second sealing element. In the longitudinal direction of the sensor, the second annular groove is located below the pressure sensing unit, and the second sealing element is located in the second annular groove. In the longitudinal direction of the sensor, the pressure sensing unit presses against the second sealing element, and the second sealing element presses against the bottom of the second annular groove.

11. The sensor according to claim 1, characterized in that, The connector includes a seat body and a protrusion. The seat body abuts against the first sealing member. The protrusion extends downward from the seat body along the longitudinal direction of the sensor. The pin extends downward from the protrusion. The outer peripheral wall of the protrusion includes a rib. The protrusion is at least partially located inside the body portion. The rib contacts the inner wall of the body portion.

12. The sensor according to any one of claims 1-7, characterized in that, The isolator is formed by stamping and / or stretching of a metal material. The isolator is partially located outside the housing. The temperature sensing element is at least partially located outside the housing and is closer to the bottom than the extension portion.

Images