Sensor

Abstract

The utility model discloses a sensor, which comprises a shell, a base and a sensing assembly, wherein the base is provided with a first port and a second port which are opposite to each other, the first port is connected with the shell, the shell and the base jointly form a first cavity, and at least one part of the sensing assembly is located in the first cavity; the sensing assembly comprises a circuit board, a temperature sensing structure and a strain type pressure sensing structure, the temperature sensing structure and the strain type pressure sensing structure are electrically connected with the circuit board, and at least one part of the temperature sensing structure extends out of the second port of the base from the fluid channel in the first cavity so as to sense the temperature of an external medium; and the strain type pressure sensing structure is communicated with the fluid channel so as to sense the pressure of the external medium. The pressure sensor can sense the temperature and the pressure of an external medium at the same time, and is high in sensing precision and simple in structure.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a sensor. Background Art

[0002] Among sensors, temperature and pressure are the two most common physical quantities in daily life. Usually, two separate sensors are required to measure them respectively. This type of sensor has a high manufacturing cost and low accuracy, which cannot meet the growing needs of life. Therefore, a sensor with better accuracy and lower price that can measure temperature and pressure at the same time is needed. Utility Model Content

[0003] The utility model aims to provide a sensor to solve the technical problem that the contact thermal resistance is large during the above-mentioned point contact, resulting in large temperature measurement deviation.

[0004] To achieve the above-mentioned purpose, the utility model provides a sensor, including a housing, a base and a sensor assembly;

[0005] The base has a first port and a second port opposite to each other, the first port is connected to the shell, the shell and the base together form a first cavity, and at least a part of the sensor component is located in the first cavity;

[0006] The sensing assembly includes a circuit board, and a temperature sensing structure and a strain type pressure sensing structure electrically connected to the circuit board, respectively, at least a portion of the temperature sensing structure extends out of the second port of the base from the fluid channel in the first cavity to sense the temperature of an external medium;

[0007] The strain gauge pressure sensing structure is connected to the fluid channel to sense the pressure of the external medium.

[0008] Furthermore, the sensing assembly further comprises a connecting member, and the strain type pressure sensing structure comprises a pressure sensitive member and a strain gauge;

[0009] The connecting member is sealedly connected to the base, and a first opening corresponding to the pressure sensitive member is provided on the connecting member, and the pressure sensitive member is connected to the fluid channel through the first opening to receive the pressure of the external medium;

[0010] One end of the strain gauge is connected to the pressure sensitive component to sense the deformation of the pressure sensitive component, and the other end of the strain gauge is electrically connected to the circuit board.

[0011] Furthermore, the sensor assembly further comprises a connecting piece, and the temperature sensing structure comprises a temperature sensing piece and a conductor pin;

[0012] Wherein, at least a portion of the temperature sensing element extends out of the second port of the base to sense the temperature of an external medium;

[0013] The connecting member is provided with a second opening corresponding to the conductor pin, one end of the conductor pin is connected to the temperature sensing member, and the other end is electrically connected to the circuit board through the second opening.

[0014] Furthermore, the longitudinal cross-section of the pressure sensitive element is in an I-shape with an opening at one end, and the opening is connected to the fluid channel.

[0015] Furthermore, the conductor pin is fixedly connected to the connector via an insulating medium, and the insulating medium electrically isolates the conductor pin from the connector.

[0016] Further, the first cavity includes a first sub-cavity corresponding to the base and a second sub-cavity corresponding to the shell;

[0017] The longitudinal cross-section of the first sub-cavity is in a step-like shape and includes a plurality of sections, and the inner diameters of the sections increase gradually along the direction from the second port to the first port.

[0018] Further, the first sub-cavity includes a first section, a second section and a third section, and a first inner diameter corresponding to the first section, a second inner diameter corresponding to the second section and a third inner diameter corresponding to the third section increase in sequence;

[0019] The first section includes the fluid channel, the connecting member is fixed to the second section, and the diameter of the connecting member corresponds to the second inner diameter.

[0020] Furthermore, the circuit board is fixed in the third section, and the diameter of the circuit board corresponds to the third inner diameter.

[0021] Furthermore, the pressure sensitive element is connected to the strain gauge via a bonding medium.

[0022] Furthermore, the connecting member and the pressure sensitive member are integrally formed.

[0023] Furthermore, a protective cover is installed on the second port of the base.

[0024] Furthermore, the sensor further comprises a plug-in structure, and a second cavity is further provided at one end of the housing away from the first cavity, and the second cavity is used to accommodate the plug-in structure;

[0025] The plug-in structure comprises a female connector for mating with an external male connector, wherein the female connector comprises a plug-in probe electrically connected to the circuit board.

[0026] Furthermore, the circuit board includes a signal processing component, one end of which is respectively connected to the temperature sensing structure and the strain-type pressure sensing structure, and the other end is connected to the plug-in probe, for converting the sensed temperature and pressure into corresponding electrical signals.

[0027] Furthermore, a sealing medium is coated on the surface where the base and the shell are connected to each other and / or a sealing ring is arranged inside where the base and the shell are connected to each other.

[0028] Furthermore, the surface of the conductor needle in contact with the external medium is coated with an insulating medium.

[0029] The technical effect of the utility model is to provide a sensor, whose strain type pressure sensing structure and temperature sensing structure both sense the external medium through a fluid channel, and the two share the fluid channel, thereby simplifying the structure of the entire sensor. In addition, the strain type pressure sensing structure and the temperature sensing structure can simultaneously sense the temperature and pressure of the external medium, and have a high sensing accuracy. In addition, the strain type pressure sensing structure is connected to the fluid channel, which increases the area where the strain type pressure sensing structure contacts the external medium, further improving the accuracy of pressure sensing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0031] Figure 1 A schematic diagram of the structure of the sensor provided in the embodiment of the present application;

[0032] Figure 2 for Figure 1 One of the schematic diagrams of the sensor cross section in the AA direction;

[0033] Figure 3 An exploded diagram of a sensor provided in an embodiment of the present application;

[0034] Figure 4 for Figure 3 Enlarged view of area B;

[0035] Figure 5 for Figure 1 The second schematic diagram of the sensor cross section in the AA direction;

[0036] Figure 6 for Figure 1 The third schematic diagram of the sensor cross section in the AA direction.

[0037] The components of the attached drawings are identified as follows:

[0038] 1. Base; 2. Shell; 3. Sensing component; 4. Protective cover; 31. Temperature sensing structure; 32. Strain-type pressure sensing structure; 33. Circuit board; 34. Connector; 311. Pressure sensitive part; 312. Strain gauge; 321. Temperature sensing part; 322. Wire needle; 323. Insulating medium; 11. First cavity; 12. Second cavity; 111. Fluid channel; 112. First section; 113. Second section; 114. Third section; 313. Adhesive medium; 35. Plug-in structure; 351. Plug-in probe; 331. Signal processing part; 332. Bonding wire. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0044] A sensor provided by the present application is described below with reference to the accompanying drawings.

[0045] like Figures 1 to 6 As shown, an embodiment of the present application provides a sensor, which includes a shell 2, a base 1 and a sensor component 3.

[0046] The base 1 has a first port and a second port opposite to each other, the first port is connected to the shell 2 , the shell 2 and the base 1 together form a first cavity 11 , and at least a part of the sensor component 3 is located in the first cavity 11 .

[0047] The sensing assembly 3 includes a circuit board 33 and a temperature sensing structure 32 and a strain-type pressure sensing structure 31 electrically connected to the circuit board 33, respectively. At least a portion of the temperature sensing structure 32 extends from the fluid channel 111 in the first cavity 11 to the outside of the second port of the base 1 to sense the temperature of the external medium.

[0048] The strain gauge pressure sensing structure 31 is connected to the fluid channel 111 to sense the pressure of the external medium.

[0049] The first cavity 11 includes a fluid channel 111, which is at the second port and is used to provide a flow space for the external medium. At least a portion of the temperature sensing structure 32 extends from the fluid channel 111 to the outside of the second port, and the portion of the temperature sensing structure 32 extending to the outside can directly contact the external medium and can accurately sense the temperature of the external medium. The external medium can be a liquid, a gas, etc.

[0050] The strain type pressure sensing structure 31 refers to the elastic element inside being deformed when it senses the pressure from the external medium, which in turn causes the resistance to change, thereby sensing the pressure of the external medium. Compared with the capacitive pressure sensor, the strain type pressure sensing structure 31 in this application has the advantages of high accuracy, large measurement range, low price and small size.

[0051] The entire strain-type pressure sensing structure 31 is in the first cavity 11, and the strain-type pressure sensing structure 31 is connected to the fluid channel 111. When the external medium enters the fluid channel 111, the elastic element in the strain-type pressure sensing structure 31 senses the pressure and deforms, causing a change in resistance, thereby obtaining an electrical signal related to the pressure of the external medium.

[0052] The sensor provided by the present application, its strain type pressure sensing structure 31 and temperature sensing structure 32 both sense the external medium through the fluid channel 111, and the two share the fluid channel 111, thereby simplifying the structure of the entire sensor. In addition, the strain type pressure sensing structure 31 and the temperature sensing structure 32 can simultaneously sense the temperature and pressure of the external medium, and have a high sensing accuracy. In addition, the strain type pressure sensing structure 31 is connected to the fluid channel 111, which increases the area where the strain type pressure sensing structure 31 contacts the external medium, further improving the accuracy of pressure sensing.

[0053] In addition, the center of the fluid channel 111 may be on the central axis of the base 1 or not. Preferably, the center of the fluid channel 111 is on the central axis of the base 1 to reduce the difficulty of manufacturing.

[0054] In some embodiments of the present application, the sensor assembly 3 further includes a connecting member 34 , and the strain gauge pressure sensing structure 31 includes a pressure sensitive member 311 and a strain gauge 312 .

[0055] The connector 34 is sealed and connected to the base 1. A first opening corresponding to the pressure sensitive component 311 is provided on the connector 34. The pressure sensitive component 311 is connected to the fluid channel 111 through the first opening to receive the pressure of the external medium. One end of the strain gauge 312 is connected to the pressure sensitive component 311 to sense the deformation of the pressure sensitive component 311. The other end of the strain gauge 312 is electrically connected to the circuit board 33. The strain gauge 312 converts the sensed deformation into a strain signal and transmits it to the circuit board 33.

[0056] Specifically, the portion where the connector 34 contacts the base 1 is sealed. At the same time, a first opening is provided on the connector 34. The first opening is adapted to the pressure sensitive component 311. Adaptation here specifically refers to the direction from the second port to the first port. The projection of the sensing area of ​​the pressure sensitive component 311 overlaps with the projection of the first opening. The overlap may be complete or partial. The projection of the sensing area of ​​the pressure sensitive component 311 may be greater than or equal to the projection of the first opening, or may be smaller than the projection of the first opening. Preferably, the projection of the sensing area of ​​the pressure sensitive component 311 is greater than or equal to the projection of the first opening.

[0057] The pressure sensitive component 311 is arranged on a side of the connector 34 close to the first port, and the fluid channel 111 is arranged on a side of the connector 34 close to the second port. The pressure sensitive component 311 is connected to the fluid channel 111 through the first opening. After the external medium enters the fluid channel 111, it will contact the pressure sensitive component 311 through the first opening. The pressure sensitive component 311 will deform after sensing the pressure brought by the external medium. The deformation sensed by the pressure sensitive component 311 is transmitted to the strain gauge 312, and the strain gauge 312 converts it into a strain signal, and transmits the strain signal to the circuit board 33, which converts it into a pressure-related electrical signal.

[0058] In addition, the circuit board 33 is disposed on a side of the strain gauge 312 close to the first port, and the circuit board 33 and the strain gauge 312 are electrically connected via bonding wires 332 .

[0059] The sensor provided in the present application enables the external medium to contact the sensing area of ​​the pressure sensitive component 311 through the fluid channel 111 through the first opening on the connecting member 34, thereby realizing pressure sensing. In addition, the portion where the connecting member 34 contacts the base 1 is a sealed connection, which can ensure that the external medium entering the fluid channel 111 does not contact other components on the side of the connecting member 34 close to the first port except for contacting the pressure sensitive component 311, especially isolating the external medium from contacting the circuit board 33, thereby increasing the life of the circuit board 33 and maintaining the normal operation of the sensor.

[0060] In some embodiments of the present application, the sensor component (3) further includes a connector (34), and the temperature sensing structure 32 includes a temperature sensing component 321 and a wire needle 322.

[0061] At least a portion of the temperature sensing element 321 extends out of the second port of the base 1 to sense the temperature of the external medium, and the remaining portion of the temperature sensing element 321 is in the fluid channel 111. A wire needle 322 is connected to the end of the temperature sensing element 321 away from the second port.

[0062] The connecting member 34 is provided with a second opening corresponding to the conductive pin 322 . One end of the conductive pin 322 is connected to the temperature sensing member 321 , and the other end is electrically connected to the circuit board 33 through the second opening.

[0063] Specifically, a part of the wire needle 322 is on the side of the connector 34 close to the second port, and this part is electrically connected to the temperature sensing part 321; the other part is on the side of the connector 34 close to the first port, and this part is electrically connected to the circuit board 33. The temperature sensing part 321 transmits the temperature signal to the circuit board 33 through the wire needle 322. The connector 34 is provided with a second opening, and the size of the second opening is adapted to the size of the wire needle 322, so that the wire needle 322 can pass through and be electrically connected to the circuit board 33, and the number of the second openings is the same. In addition to ensuring that the wire needle 322 passes through, the second opening does not leave any additional gap to prevent the external medium from contacting other components on the side of the connector 34 close to the first port through the gap. Among them, the adaptation of the size of the second opening and the size of the wire needle 322 specifically means that along the direction from the second port to the first port, the projection of the second opening completely overlaps with the projection of the wire needle 322, and the projection size of the second opening can be equal to the projection size of the wire needle 322, or slightly larger than the projection size of the wire needle 322. The extra gap is left for the insulating medium to adhere the wire needle to the second opening.

[0064] It should be noted that the first opening and the second opening do not overlap, and there is a certain gap between the first opening and the second opening to ensure that the wire needle 322 passing through the second opening is isolated from the pressure sensitive component 311.

[0065] Schematically, the temperature sensing element 321 includes a temperature sensing head and two probes welded on the temperature sensing head, which is in a U shape, a part of the temperature sensing head extends out of the second port, the remaining part of the temperature sensing head and the probe are in the fluid channel 111, and the wire needle 322 is electrically connected to the remaining end of the probe. The shape of the wire needle 322 is related to the relative position of the second opening and the probe. For example, if the second opening and the probe are in a straight line, the wire needle 322 can be a straight line; for another example, when the distance between the two probes is less than the distance between the two second openings, the two wire needles 322 are wide near the connector 34 and tight away from the connector 34; for another example, when the distance between the two probes is greater than the distance between the two second openings, the two wire needles 322 are tight near the connector 34 and loose away from the connector 34.

[0066] In some embodiments of the present application, the longitudinal cross-section of the pressure sensitive element 311 is in an I-shape with an opening at one end, and the opening is connected to the fluid channel 111 .

[0067] It should be noted that the longitudinal cross section of the pressure sensitive component 311 here refers to the direction along the AA direction, that is, the direction in which the second port points to the first port. And along the direction in which the second port points to the first port, the projection of the opening coincides with the projection of the first opening, which may be completely coincident or partially coincident, and the size of the projection of the opening may be greater than or equal to the size of the projection of the first opening, or may be smaller than the size of the projection of the first opening. Preferably, the projection of the opening coincides completely with the projection of the first opening, and the size of the projection of the opening may be equal to the size of the projection of the first opening.

[0068] The connection between the connecting member 34 and the pressure sensitive member 311 may be sealed, or the connecting member 34 and the pressure sensitive member 311 may be integrally formed.

[0069] In some embodiments of the present application, the conductor needle 322 is fixedly connected to the connector 34 through an insulating medium 323, and the insulating medium 323 electrically isolates the conductor needle 322 from the connector 34. The insulating medium 323 may be glass, ceramic, plastic, etc. The glass or ceramic is fixedly connected to the connector 34 through a sintering process, and the plastic is fixedly connected to the connector 34 after solidification. Specifically, the insulating medium 323 is arranged at the second opening, which ensures that the conductor needle 322 is fixed on the connector 34 while ensuring that the conductor needle 322 is electrically isolated from the connector 34 when passing through the connector 34.

[0070] In some embodiments of the present application, the first cavity 11 includes a first sub-cavity corresponding to the base 1 and a second sub-cavity corresponding to the shell 2. That is, the first cavity 11 includes a first sub-cavity and a second sub-cavity, wherein the first sub-cavity corresponds to the base 1 part, and the second sub-cavity corresponds to the shell 2 part.

[0071] The longitudinal cross-section of the first sub-cavity is stepped and includes a plurality of sections, and the inner diameter of the sections increases along the direction from the second port to the first port. Similarly, the longitudinal cross-section of the first sub-cavity here refers to the direction along the AA direction, that is, the direction from the second port to the first port.

[0072] It should be noted that the first sub-cavity includes a fluid channel 111, and the fluid channel 111 is composed of at least one section close to the second port position. By setting the first sub-cavity in a step shape, the processing of the base 1 is facilitated.

[0073] See also Figure 5 , the first sub-cavity includes a first section 112, a second section 113 and a third section 114, and the first inner diameter corresponding to the first section 112, the second inner diameter corresponding to the second section 113 and the third inner diameter corresponding to the third section 114 are increased in sequence. The first section 112, the second section 113 and the third section 114 are arranged in sequence along the direction from the second port to the first port, and accordingly, the first inner diameter < the second inner diameter < the third inner diameter.

[0074] The first section 112 includes the fluid channel 111 , the connecting member 34 is fixed to the second section 113 , and the diameter of the connecting member 34 corresponds to the second inner diameter.

[0075] Specifically, the first section 112 is composed of a plurality of subsections, including a fluid channel 111, which is used to accommodate a portion of the wire needle 322 and a portion of the temperature sensing element 321, and provides space for an external medium. The second section 113 is used to accommodate the connector 34, the pressure sensitive element 311, the strain gauge 312, and a portion of the wire needle 322. The third section 114 is used to accommodate the circuit board 33.

[0076] In order to ensure that the external medium does not leak into the third section 114, the connector 34 is sealed with the base 1 in the second section 113, and the outer diameter of the connector 34 is equal to the second inner diameter, which may have a certain error.

[0077] In some other embodiments of the present application, the circuit board 33 is fixed to the third section 114, and the diameter of the circuit board 33 corresponds to the third inner diameter. That is, the outer diameter of the circuit board 33 is equal to the third inner diameter, and similarly, there may be a certain error in the equality here. The second inner diameter of the second section 113 provided in the embodiment of the present application is smaller than the third inner diameter of the third section 114, which can provide support for the circuit board 33 of the third section 114.

[0078] See also Figure 4 The pressure sensitive element 311 and the strain gauge 312 may be connected via a bonding medium 313. The bonding medium 313 is filled in the gap of the strain gauge 312, and the bonding medium 313 is adapted to the shape of each groove in the strain gauge 312. The bonding medium 313 may be resin, silicone rubber, etc., which is not limited in the present application.

[0079] It should be noted that there can be multiple strain gauges 312. Multiple strain gauges 312 are bonded to the upper surface of the pressure sensitive component 311. The lower surface of the pressure sensitive component 311 senses the pressure brought by the external medium. The pressure sensitive component 311 generates strain after sensing the pressure of the external medium, and the strain is transmitted to the strain gauge 312 via the bonding medium 313. The strain gauge 312 converts the strain signal into a corresponding resistance value change signal, and then transmits the resistance value change signal to the circuit board 33.

[0080] See also Figure 6 , a protective cover 4 is installed on the second port of the base 1, and the protective cover 4 can be installed on the base 1 by means of snapping, riveting, welding, etc., and the temperature sensing element 321 is protected by the protective cover 4. It should be noted that when the protective cover 4 is installed, a part of the temperature sensing element 321 still extends outside the protective cover 4 and can be in direct contact with the external medium. Compared with the absence of the protective cover 4, the area of ​​direct contact between the temperature sensing element 321 and the external medium is reduced. In order to take into account the protection function of the temperature sensing element 321 and expand the contact area between the temperature sensing element 321 and the external medium, at least one through hole is provided on the protective cover 4. Schematically, the protective cover 4 can be a protective grid.

[0081] In another embodiment of the present application, the sensor further includes a plug-in structure 35 , and a second cavity 12 is further provided at one end of the housing 2 away from the first cavity 11 , and the second cavity 12 is used to accommodate the plug-in structure 35 .

[0082] The plug structure 35 includes a female connector for mating with an external male connector, wherein the female connector includes a plug probe 351 electrically connected to the circuit board 33 .

[0083] Specifically, the sensor also includes a plug-in structure 35, which is arranged in the second cavity 12 of the shell 2. The second cavity 12 refers to an area inside the shell 2 that is different from the first cavity 11. The second cavity 12 is above the first cavity 11, and the above here refers to the direction in which the second port points to the first port.

[0084] The plug structure 35 includes a female plug connector for mating with an external male plug connector, wherein the female plug connector includes at least one plug probe 351 electrically connected to the circuit board 33. It should be noted that the circuit board 33 processes the temperature and pressure signals sensed by the sensor component 3, and transmits the processed temperature and pressure signals to the plug probe 351. In addition, the plug probe 351 can be connected to the circuit board 33 by means of a spring, a spring clip, a spring pin, etc.

[0085] In another embodiment of the present application, the circuit board 33 includes a signal processing component 331, one end of which is connected to the strain gauge 312 in the strain-type pressure sensing structure (31) and the wire needle 322 in the temperature sensing structure (32), and the other end is connected to the plug-in probe 351, so as to convert the sensed temperature and pressure into corresponding electrical signals.

[0086] In this embodiment, one side of the signal processing element 331 is electrically connected to the strain gauge 312 and the wire needle 322, and the other side is electrically connected to the plug-in probe 351 in the plug-in structure 35. The signal processing element 331 can be an IC chip, which is used to process and convert the pressure signal and temperature signal transmitted by the strain gauge 312 and the wire needle 322, and transmit the processed pressure signal and temperature signal to the plug-in probe 351, which is then transmitted to the external control unit by the plug-in probe 351. It should be noted that a plurality of signal processing elements 331 can be provided on the circuit board 33.

[0087] In another embodiment of the present application, a sealing medium is coated on the surface where the base 1 and the shell 2 are connected to each other and / or a sealing ring is provided inside where the base 1 and the shell 2 are connected to each other.

[0088] Specifically, the base 1 and the shell 2 can be fixedly connected by riveting, and a sealing medium is applied to the outer surface where the base 1 and the shell 2 are connected to improve the sealing performance and prevent the external medium from entering from the connection between the base 1 and the shell 2 and damaging the circuit board 33 and other components. In addition, when the shell 2 and the base 1 are riveted, the shell 2 can be riveted to the edge of the circuit board 33, that is, to the third section 114, to further improve the sealing performance.

[0089] In order to further improve the sealing performance, a sealing ring may be provided inside the connection between the base 1 and the shell 2 .

[0090] In another embodiment of the present application, in order to insulate and protect the sensor, the surface of the wire needle 322 in contact with the external medium is coated with an insulating medium 323 to prevent damage to the wire needle 322 when the external medium is conductive.

[0091] As can be seen from the above, the sensor provided by the present application senses temperature and pressure respectively by setting a temperature sensing structure 32 and a pressure sensing structure, thereby obtaining pressure data and temperature data of an external medium at the same time, and realizing the measurement of two physical quantities, temperature and pressure, by one sensor, and only one interface is needed to transmit pressure and temperature data to a control unit. In addition, the temperature sensing member 321 can directly contact the external medium, so that the temperature measurement has a fast response speed, a reduced response time, and a high measurement accuracy. The strain type pressure sensing structure 31 completes the pressure measurement based on the resistance change brought by the external medium, and has a higher measurement accuracy than the capacitive pressure sensor. The temperature sensing structure 32 and the strain type pressure sensing structure 31 also share the same fluid channel 111, which is easy to process. And the sealing is achieved by the connector 34 to prevent the external medium from causing damage to other components such as the circuit board 33, and to make the structure of the entire sensor simple.

[0092] In addition, the pressure sensitive component 311 and the shell 2 are separated by a circuit board 33. During the fixed installation of the shell 2 and the base 1, the influence of the installation stress on the pressure sensitive component 311 can be avoided, and the product drift of the strain type pressure sensing structure 31 caused by the installation stress can be reduced, thereby improving the overall measurement stability of the sensor.

[0093] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0094] The above is a detailed introduction to a sensor provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A sensor, characterized in that: It comprises a housing (2), a base (1) and a sensor assembly (3); The base (1) has a first port and a second port opposite to each other, the first port is connected to the shell (2), the shell (2) and the base (1) together form a first cavity (11), and at least a portion of the sensor component (3) is located in the first cavity (11); The sensing assembly (3) comprises a circuit board (33) and a temperature sensing structure (32) and a strain type pressure sensing structure (31) respectively electrically connected to the circuit board (33); at least a portion of the temperature sensing structure (32) extends from the fluid channel (111) in the first cavity (11) outside the second port of the base (1) to sense the temperature of an external medium; The strain type pressure sensing structure (31) is connected to the fluid channel (111) to sense the pressure of the external medium.

2. The sensor according to claim 1, characterized in that The sensing assembly (3) further comprises a connecting member (34), and the strain type pressure sensing structure (31) comprises a pressure sensitive member (311) and a strain gauge (312); The connecting member (34) is sealedly connected to the base (1), and a first opening corresponding to the pressure sensitive member (311) is provided on the connecting member (34); the pressure sensitive member (311) is connected to the fluid channel (111) through the first opening to receive the pressure of the external medium; One end of the strain gauge (312) is connected to the pressure sensitive component (311) to sense the deformation of the pressure sensitive component (311), and the other end of the strain gauge (312) is electrically connected to the circuit board (33).

3. The sensor according to claim 1, characterized in that The sensing component (3) further comprises a connecting member (34), and the temperature sensing structure (32) comprises a temperature sensing member (321) and a conductor needle (322); Wherein, at least a portion of the temperature sensing element (321) extends out of the second port of the base (1) to sense the temperature of an external medium; The connecting member (34) is provided with a second opening corresponding to the wire needle (322); one end of the wire needle (322) is connected to the temperature sensing member (321), and the other end is electrically connected to the circuit board (33) through the second opening.

4. The sensor according to claim 2, characterized in that The longitudinal cross-section of the pressure sensitive element (311) is in the shape of an I-beam with an opening at one end, and the opening is connected to the fluid channel (111).

5. The sensor according to claim 3, characterized in that The conductor needle (322) is fixedly connected to the connecting piece (34) via an insulating medium (323), and the insulating medium (323) electrically isolates the conductor needle (322) from the connecting piece (34).

6. The sensor according to claim 2, characterized in that The first cavity (11) comprises a first sub-cavity corresponding to the base (1) and a second sub-cavity corresponding to the shell (2); The longitudinal cross-section of the first sub-cavity is in a step-like shape and includes a plurality of sections, and the inner diameters of the sections increase gradually along the direction from the second port to the first port.

7. The sensor according to claim 6, characterized in that The first sub-cavity comprises a first section (112), a second section (113) and a third section (114), and a first inner diameter corresponding to the first section (112), a second inner diameter corresponding to the second section (113) and a third inner diameter corresponding to the third section (114) increase in sequence; The first section (112) includes the fluid channel (111), the connecting member (34) is fixed to the second section (113), and the diameter of the connecting member (34) corresponds to the second inner diameter.

8. The sensor according to claim 7, characterized in that The circuit board (33) is fixed to the third section (114), and the diameter of the circuit board (33) corresponds to the third inner diameter.

9. The sensor according to claim 2, characterized in that The pressure sensitive element (311) is connected to the strain gauge (312) via a bonding medium (313).

10. The sensor according to claim 2, characterized in that The connecting piece (34) and the pressure sensitive piece (311) are integrally formed.

11. The sensor according to claim 1, characterized in that A protective cover (4) is installed on the second port of the base (1).

12. The sensor according to claim 1, characterized in that The sensor further comprises a plug-in structure (35); a second cavity (12) is further provided at one end of the housing (2) away from the first cavity (11); the second cavity (12) is used to accommodate the plug-in structure (35); The plug-in structure (35) comprises a female plug-in connector for mating with an external male plug-in connector, wherein the female plug-in connector comprises a plug-in probe (351) electrically connected to the circuit board (33).

13. The sensor according to claim 12, characterized in that The circuit board (33) comprises a signal processing component (331), one end of which is respectively connected to the temperature sensing structure (32) and the strain type pressure sensing structure (31), and the other end of which is connected to the plug-in probe (351), for converting the sensed temperature and pressure into corresponding electrical signals.

14. The sensor according to claim 1, characterized in that A sealing medium is coated on the surface where the base (1) and the shell (2) are connected to each other, and / or a sealing ring is provided inside where the base (1) and the shell (2) are connected to each other.

15. The sensor according to claim 3, characterized in that The surface of the conductor needle (322) in contact with the external medium is coated with an insulating medium.

Images