Pressure sensor

Abstract

The invention provides a pressure sensor. The pressure sensor comprises an outer cover, a pressure seat connected to one end of the outer cover, a strain gauge connected to the pressure seat, a circuit board electrically connected with the strain gauge, a connecting seat connected with the circuit board and a conductive connecting piece connected to the connecting seat. Wherein the length of the circuit board is arranged along the axial direction of the accommodating cavity of the outer cover, so that the radial size of the pressure sensor is reduced, and the pressure sensor can be conveniently arranged on a pipeline or a valve body; the end face, facing the circuit board, of the connecting base is provided with a containing groove, the end face, deviating from the circuit board, of the connecting base is provided with a containing cavity, the containing cavity partially coincides with the containing groove in the axial direction of the connecting base, the side face of the containing cavity is communicated with the containing groove, and one end of the circuit board is inserted into the containing groove. The first end of the conductive connecting piece is located in the accommodating cavity and is in contact connection with the circuit board under the limitation of the accommodating cavity, so that the electric connection structure between the conductive connecting piece and the circuit board is simple, the overall production of the pressure sensor is more convenient, and the cost is lower.

Description

Technical Field

[0001] The invention relates to the field of detection equipment, and in particular to a pressure sensor. Background Art

[0002] Pressure sensors are the most commonly used sensors in industrial practice. They are widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemicals, oil wells, electricity, ships, machine tools, pipelines, etc.

[0003] Brake pressure sensors can be used in the body stability system (ESC / ESP) or OneBox wire control brake system in assisted driving and autonomous driving vehicles to monitor the hydraulic pressure signal in the pipeline of the brake system in real time. The control unit calculates the wheel braking force and the longitudinal force acting on the vehicle based on the pressure signal of the brake pressure sensor. Based on the pressure signal provided by the brake pressure transmitter, the system can adjust the braking force more intelligently, thereby improving the driving stability and safety of the vehicle. In addition, the pressure signal provided by the brake pressure sensor can also assist the new energy vehicle brake energy recovery system (EBS) to manage energy recovery and distribution, thereby improving the vehicle's braking efficiency and energy saving.

[0004] Among them, the brake pressure sensor is usually set on the pipeline or valve body, so it is required to be small in size, for example: the diameter is less than one centimeter and the length is about two to four times the diameter. However, the existing brake pressure sensors are usually complex in structure and large in size, which makes it inconvenient to arrange the brake pressure sensor on the pipeline or valve body. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing pressure sensor has a complex structure and a large volume, which makes it inconvenient to arrange the brake pressure sensor on a pipeline or a valve body.

[0006] In order to solve the above technical problems, the present invention provides a pressure sensor, including an outer cover, a pressure seat, a strain gauge, a circuit board, a connecting seat and a conductive connecting piece; a receiving cavity is formed inside the outer cover; the pressure seat is connected to one end of the outer cover, a pressure-inducing hole with an open end is formed on the pressure seat, and the other end of the pressure seat is a closed end, and the closed end is accommodated in the receiving cavity; the strain gauge is arranged in the receiving cavity and is arranged at the closed end of the pressure seat; the circuit board is arranged in the receiving cavity and is arranged close to the strain gauge, the length direction of the circuit board is arranged along the axial direction of the receiving cavity, and the strain gauge is electrically connected to the circuit board; the connecting seat The connector is arranged in the accommodating cavity and close to the other end of the outer cover, and an accommodating groove is provided on one end surface of the connecting seat facing the circuit board, and one end of the circuit board is inserted into the accommodating groove; an accommodating cavity is provided on one end surface of the connecting seat away from the circuit board, and the accommodating cavity and the accommodating groove partially overlap in the axial direction of the connecting seat, and the side surface of the accommodating cavity is connected to the accommodating groove; the conductive connecting member includes a first end and a second end connected to each other, the first end is located in the accommodating cavity, the diameter of the first end is larger than the diameter of the second end, and the side surface of the first end is electrically connected to the circuit board; the second end passes through the accommodating cavity to be electrically connected to an external circuit.

[0007] In some schemes of the present application, an inclined surface is provided at one end of the accommodating cavity close to the circuit board, and the inclined surface is inclined from the inside to the outside toward a direction away from the circuit board; the first end is elastic in its radial direction, and the first end is in contact with the inclined surface, and the inclined surface presses the first end so that the first end is in close contact with the circuit board.

[0008] In some solutions of the present application, there are multiple conductive connectors, the multiple conductive connectors are arranged at intervals, and the first ends of the multiple conductive connectors are respectively contacted and arranged on the upper and lower sides of the circuit board.

[0009] In some schemes of the present application, the conductive connectors are configured as three, one of the three conductive connectors is arranged on the upper side of the circuit board, and the other two are arranged on the lower side of the circuit board, and the three conductive connectors are distributed in an equilateral triangle.

[0010] In some solutions of the present application, the pressure sensor further includes a bracket, which is disposed between the pressure seat and the connecting seat, and one end of the bracket is fixedly connected to the pressure seat, and the other end is connected to the connecting seat; The circuit board is mounted on the bracket, and the circuit board and the strain gauge are located in the same plane to reduce the bending angle of the binding line between the strain gauge and the circuit board.

[0011] In some schemes of the present application, a first positioning groove is provided on the circuit board; a first positioning column is provided on the bracket, the extension direction of the first positioning column is perpendicular to the axial direction of the accommodating cavity, and is arranged in coordination with the first positioning groove; the first positioning column is inserted into the first positioning groove.

[0012] In some schemes of the present application, the pressure seat is provided with a first positioning structure, and the bracket is provided with a second positioning structure, and the second positioning structure is arranged in a close fit with the first positioning structure so that the circuit board and the strain gauge are located in the same plane; and / or the bracket is provided with a second positioning groove, and the connecting seat is provided with a second positioning column protruding toward one end of the bracket, and the second positioning column extends along the axial direction of the outer cover; the second positioning column and the second positioning groove are cooperated to connect the connecting seat to the bracket.

[0013] In some schemes of the present application, the pressure sensor also includes an end cover, which is arranged on a side of the connecting base facing away from the circuit board and connected to the connecting base; the first end of the conductive connector is elastic in its axial direction, and the first end of the conductive connector abuts between the connecting base and the end cover, and the second end of the conductive connector passes through the end cover.

[0014] In some schemes of the present application, a third positioning groove is provided on the connecting seat, and a third positioning column is provided on a protrusion on one side of the end cover toward the pressure seat, and the third positioning column extends axially along the outer cover; the third positioning column is arranged in cooperation with the third positioning groove to connect the end cover to the connecting seat.

[0015] In some schemes of the present application, the pressure seat includes a connecting part and a pressure measuring part arranged on the connecting part, the connecting part is connected to the outer cover, the pressure measuring part is arranged at one end of the connecting part facing the connecting seat, the pressure-inducing hole passes through the connecting part and forms a blind hole on the pressure measuring part; an elastic film surface is formed on one side of the pressure measuring part, and the strain gauge is arranged on the elastic film surface; and / or the pressure seat is a metal injection molded one-piece structure.

[0016] It can be seen from the above technical scheme that the beneficial effects of the present invention are as follows: the pressure sensor of the present application includes an outer cover, a pressure seat connected to one end of the outer cover, a strain gauge connected to the pressure seat, a circuit board arranged in the outer cover and electrically connected to the strain gauge, a connection seat arranged in the outer cover and connected to the circuit board, and a conductive connector connected to the connection seat, and the conductive connector is used to electrically connect the circuit board and an external circuit. Among them, the length of the circuit board is arranged along the axial direction of the accommodating cavity of the outer cover to reduce the radial size of the pressure sensor and facilitate the arrangement of the pressure sensor on the pipeline or valve body; and, the connection seat is provided with a accommodating groove on one end face facing the circuit board, and the connection seat is provided with an accommodating cavity on one end face facing away from the circuit board, the accommodating cavity partially overlaps with the accommodating groove in the axial direction of the connection seat, and the side of the accommodating cavity is connected to the accommodating groove, one end of the circuit board is inserted into the accommodating groove, the first end of the conductive connector is located in the accommodating cavity, and the side of the first end of the conductive connector is contacted and connected with the circuit board under the restriction of the accommodating cavity, so that the electrical connection structure between the conductive connector and the circuit board is simple, thereby making the production of the pressure sensor as a whole more convenient and lower in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a pressure sensor in one embodiment, wherein the outer cover and the connecting seat are cut away.

[0018] Figure 2 It is a schematic diagram of the main structure of a pressure sensor in one embodiment.

[0019] Figure 3 Schematic diagram of the exploded structure of a pressure sensor in one embodiment.

[0020] Figure 4 yes Figure 2 A local enlarged schematic diagram at point A.

[0021] Figure 5 1 is a schematic diagram of the structure of a pressure seat in one embodiment.

[0022] Figure 6 1 is a schematic diagram of the structure of a pressure seat in one embodiment.

[0023] Figure 7 It is a schematic structural diagram of a connecting socket in one embodiment.

[0024] Figure 8 yes Figure 7 The structure diagram of the connecting socket shown is shown in another perspective.

[0025] Fig. 9 yes Figure 7 The cross-sectional structural schematic diagram of the connecting socket is shown.

[0026] Fig.10 It is a schematic structural diagram of an end cover in one embodiment.

[0027] Fig.11 yes Fig.10 The end cap shown is a schematic structural diagram from another perspective.

[0028] Fig.12 yes Fig.10 A schematic cross-sectional structural diagram of the end cover is shown.

[0029] The reference numerals are as follows: 1-outer cover; 11-limiting structure; 12-accommodating chamber; 2-pressure seat; 21-connecting part; 22-pressure measuring part; 221-elastic film surface; 23-pressure induction hole; 24-stress groove; 25-first positioning structure; 26-closed end; 3-strain gauge; 4-circuit board; 5-bracket; 51-second positioning structure; 52-first positioning column; 53-hollow hole; 54-second positioning groove; 55-contact part; 6-connecting Seat; 61-second positioning column; 62-accommodating groove; 63-accommodating cavity; 631-inclined surface; 64-third positioning groove; 7-conductive connector; 71-first end; 72-second end; 701-first conductive connector; 702-second conductive connector; 703-third conductive connector; 8-end cover; 81-third positioning column; 82-limiting groove; 83-mounting hole; 831-first through hole section; 832-second through hole section; 9-silicone gel. DETAILED DESCRIPTION

[0030] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0031] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] The pressure sensor of this application is mainly used in the body stability system (ESC / ESP) or wire control brake system (OneBox) in assisted driving and self-driving cars, and is used to monitor the hydraulic pressure signal in the pipeline of the braking system in real time. The control unit calculates the wheel braking force and the longitudinal force acting on the vehicle based on this pressure signal. In addition, the pressure sensor is usually set on the pipeline or valve body, so its volume is required to be as small as possible to reduce the resistance to the detected fluid and facilitate the installation of the pressure sensor.

[0034] See also Figures 1 to 3 In view of the requirement that the pressure sensor is applied to the vehicle body stability system or the wire control brake system, the present application provides a pressure sensor, including an outer cover 1, a pressure seat 2, a strain gauge 3, a circuit board 4, a bracket 5, a connecting seat 6, a conductive connector 7 and an end cover 8. The outer cover 1 is formed with a receiving cavity 12, the pressure seat 2 is connected to one end of the outer cover 1, and a pressure-inducing hole 23 with an open end is formed on the pressure seat 2. The other end of the pressure seat 2 is a closed end 26, and the closed end 26 is accommodated in the receiving cavity 12. The strain gauge 3 is arranged in the receiving cavity 12 and is arranged at the closed end 26 of the pressure seat 2. The circuit board 4 is arranged in the receiving cavity 12 and is arranged close to the strain gauge 3, and the strain gauge 3 is electrically connected to the circuit board 4. The connecting seat 6 is arranged in the receiving cavity 12 and is arranged at one end of the outer cover 1 away from the pressure seat 2. The bracket 5 is connected between the connecting seat 6 and the pressure seat 2, and is connected to both the connecting seat 6 and the pressure seat 2. The circuit board 4 is mounted on the bracket 5, and the length direction of the circuit board 4 is arranged along the axial direction of the receiving cavity 12. The end cap 8 is arranged on the side of the connection base 6 away from the circuit board. The conductive connector 7 includes a first end 71 and a second end 72 connected to each other. The first end 71 is arranged on the connection base 6, and the side of the first end 71 is electrically connected to the circuit board 4; the second end 72 passes through the end cap 8 to be electrically connected to the external circuit.

[0035] The working principle of the pressure sensor is as follows: the fluid to be measured enters the inside of the pressure inlet hole 23 from the opening of the pressure inlet hole 23, and causes the side wall of the pressure inlet hole 23 to undergo elastic deformation, thereby causing the resistance value of the strain gauge 3 to change. The strain gauge 3 is electrically connected to the circuit of the circuit board 4, and the change in the resistance value of the strain gauge 3 is converted into an electrical signal through the circuit on the circuit board 4, thereby converting the elastic deformation of the pressure seat 2 into an electrical signal. The circuit board 4 transmits the electrical signal to the control circuit of the external device that uses the pressure sensor through the conductive connector 7.

[0036] Among them, the length direction of the circuit board 4 is arranged along the axial direction of the accommodating cavity 12, so as to reduce the size of the circuit board 4 in the radial direction of the accommodating cavity 12, thereby reducing the radial size of the pressure sensor. For example, the radial size of the pressure sensor can be less than 10mm, and an electrical component for converting the resistance value change of the strain gauge 3 into an electrical signal can be arranged along the length of the circuit board 4. If the circuit board 4 is arranged along the radial direction of the accommodating cavity 12, due to the size limitation of the electrical component for converting the resistance value change of the strain gauge 3 into an electrical signal, the radial size of the pressure sensor cannot be set to less than 10mm. The radial size of the pressure sensor of the present application can be reduced to 6-8mm.

[0037] See also Figure 4 Furthermore, a receiving groove 62 is provided on one end face of the connection seat 6 facing the circuit board 4, and a receiving cavity 63 is provided on one end face of the connection seat 6 facing away from the circuit board 4. The receiving cavity 63 and the receiving groove 62 partially overlap in the axial direction of the connection seat 6, and the side of the receiving cavity 63 is communicated with the receiving groove 62. One end of the circuit board 4 is inserted into the receiving groove 62, and the first end 71 of the conductive connector 7 is located in the receiving cavity 63, and the side of the first end 71 is in contact with the circuit board 4 under the restriction of the receiving cavity 63. In this way, there is no need to set a conductive seat for abutting the end of the conductive connector 7 between the conductive connector 7 and the circuit board 4, so that the electrical connection structure between the conductive connector 7 and the circuit board 4 is simple, thereby making the production of the pressure sensor as a whole more convenient and less costly.

[0038] See also Figure 2 Specifically, the outer cover 1 is hollow and forms a receiving cavity 12, and a limiting structure 11 is formed at one end of the outer cover 1. Figure 2 In the embodiment shown, the outer cover 1 is cylindrical, which makes production convenient and low in cost. In other embodiments, the outer cover 1 may also be a polygonal prism structure.

[0039] When assembling the pressure sensor, first connect the pressure seat 2, strain gauge 3, circuit board 4, bracket 5, connection seat 6, conductive connector 7 and end cover 8 together to form an assembly component; then put the outer cover 1 on the assembly component, so that the strain gauge 3, circuit board 4, bracket 5, connection seat 6, conductive connector 7 and end cover 8 are all located inside the accommodating cavity 12 of the outer cover 1, and the end cover 8 is against the limiting structure 11; then, weld and fix the outer cover 1 and the pressure seat 2, so that the assembly component and the outer cover 1 form a pressure sensor. By adopting such an assembly method, the pressure seat 2, strain gauge 3, circuit board 4, bracket 5, connection seat 6, conductive connector 7 and end cover 8 are all located outside the outer cover 1 when assembled, which facilitates the positioning and connection between various components, reduces production costs, and the connection status between various components can be directly observed during production, improving the connection reliability between various components.

[0040] See also Figure 2 and Figure 5 The pressure seat 2 includes a connecting portion 21 and a pressure measuring portion 22 disposed on the connecting portion 21. The connecting portion 21 is connected to the outer side of the outer cover 1 in the axial direction and is located at an end of the outer cover 1 away from the limiting structure 11. The connecting portion 21 is used to connect to a device to which the pressure sensor is applied so as to install the pressure sensor on the device. After the connecting portion 21 is connected to the outer cover 1, the pressure measuring portion 22 is located in the accommodating cavity 12 of the outer cover 1.

[0041] Among them, the connecting part 21 is at least partially located on the outside of the outer cover 1 in the axial direction, so that in addition to being able to be connected to the equipment using the pressure sensor, the connecting part 21 can also be used to fix the pressure seat 2 when welding between the pressure seat 2 and the outer cover 1, and then the outer cover 1 is put on the pressure seat 2 and fixedly connected, thereby reducing the difficulty of producing the pressure sensor.

[0042] The pressure-introducing hole 23 penetrates the connecting portion 21 and forms a blind hole on the pressure-measuring portion 22, that is, the closed section of the pressure-introducing hole 23 is arranged on the pressure-measuring portion 22. When the pressure sensor is connected to a device using the pressure sensor through the connecting portion 21, the pressure-introducing hole 23 is connected to the fluid channel of the device, so that the fluid to be measured can enter the pressure-introducing hole 23.

[0043] An elastic film surface 221 is formed on one side of the pressure measuring part 22. When the fluid with pressure enters the pressure-inducing hole 23, the pressure seat 2 is elastically deformed at the elastic film surface 221. The strain gauge 3 is arranged on the elastic film surface 221 to detect the elastic deformation amount at the elastic film surface 221. In the present application, the elastic film surface 221 is arranged on a side surface of the pressure measuring part 22, and is arranged relative to the end surface of the pressure measuring part 22, so that the elastic film surface 221 is roughly parallel to the plane where the circuit board 4 is located, so that the electrical connection between the strain gauge 3 on the elastic film surface 221 and the circuit board 4 is convenient.

[0044] A stress groove 24 is provided between the connecting portion 21 and the pressure measuring portion 22. The stress groove 24 is annular and is arranged on the outer surface of the pressure seat 2. When the pressure seat 2 is connected to the equipment through the connecting portion 21, stress will be generated. The stress groove 24 can isolate the stress to avoid affecting the accuracy of the strain gauge 3 arranged on the elastic film surface 221.

[0045] In one embodiment, the pressure seat 2 is provided with a first positioning structure 25, and the first positioning structure 25 is used for positioning with the circuit board 4 so that the elastic film surface 221 is parallel to the plane where the circuit board 4 is located. Figure 5 In the illustrated embodiment, the first positioning structure 25 is disposed on one circumferential side of the pressure measuring portion 22 .

[0046] In one embodiment, the connection portion 21 and the pressure measuring portion 22 are integrally formed by metal injection molding. That is, when the pressure seat 2 is formed by metal injection molding, the connection portion 21, the pressure measuring portion 22, the pressure-inducing hole 23, the stress groove 24 and the elastic film surface 221 of the pressure seat 2 are formed at the same time. Compared with the existing production method of processing the pressure-inducing hole 23, the stress groove 24 and the elastic film surface 221 on the metal injection molding part by processing equipment respectively, the pressure seat 2 of the present application does not need to be processed by the pressure-inducing hole 23, the stress groove 24 and the elastic film surface 221 after injection molding, which simplifies the process and reduces the production cost. Moreover, for a small-sized pressure seat 2, deformation of the pressure seat 2 during processing of the pressure-inducing hole 23, the stress groove 24 and the elastic film surface 221 can be avoided, thereby ensuring the quality of the product.

[0047] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 , the bracket 5 is welded on the pressure seat 2, and the circuit board 4 is fixed on the bracket 5, that is, the circuit board 4 is installed on the pressure seat 2 through the bracket 5. A second positioning structure 51 is provided on the bracket 5, and the second positioning structure 51 is arranged in cooperation with the first positioning structure 25 so that the circuit board 4 and the strain gauge 3 are roughly located in the same plane. In this way, the bending angle of the binding line between the strain gauge 3 and the circuit board 4 is reduced, making it easier to bind the binding line. In addition, since there is no height difference and the bending angle of the binding line foot is small, the vibration resistance of the product is enhanced.

[0048] The circuit board 4 is arranged close to the strain gauge 3 , and the binding wire is electrically connected to one end of the circuit board 4 close to the strain gauge 3 , so that the length of the binding wire is shortened and the quality of the binding wire is ensured.

[0049] exist Figure 5 and Figure 6 In the illustrated embodiment, the first positioning structure 25 is a positioning plane disposed on one side of the circumference of the pressure seat 2, the second positioning structure 51 is a positioning plane disposed on the bracket 5, and the second positioning structure 51 is disposed at one end where the bracket 5 is connected to the pressure seat 2, so that the end of the bracket 5 close to the pressure seat 2 is approximately circular. When the bracket 5 is connected to the pressure seat 2, the bracket 5 is first sleeved on the pressure seat 2, and the second positioning structure 51 is fitted with the first positioning structure 25 to limit the relative rotation between the bracket 5 and the pressure seat 2, so that the circuit board 4 and the strain gauge 3 are located in the same plane, and then the bracket 5 is laser welded to the pressure seat 2. In other embodiments, the bracket 5 and the pressure seat 2 are interference fit, so that after the bracket 5 is sleeved on the pressure seat 2, a fixed connection between the bracket 5 and the pressure seat 2 is achieved.

[0050] In other embodiments, one of the first positioning structure 25 and the second positioning structure 51 is a groove, and the other is a positioning protrusion that cooperates with the groove. The positioning protrusion is inserted into the groove and can also limit the relative rotation between the bracket 5 and the pressure seat 2.

[0051] The end of the bracket 5 away from the pressure seat 2 is approximately in a semicircular structure, the concave side of the semicircular structure is arranged upward, and the circuit board 4 is installed at the opening of the semicircular structure, that is, the circuit board 4 is arranged on the top surface of the end of the bracket 5 away from the pressure seat 2. In this way, the circuit board 4 is located in the middle of the accommodating cavity 12 in the up-down direction, that is, there is space for arranging electrical components on both the upper and lower sides of the circuit board 4, so that electrical components can be arranged on both the upper and lower sides of the circuit board 4, and the electrical components will not interfere with the bracket 5.

[0052] Since the circuit board 4 is used to fix the electrical components, and the size of the circuit board 4 is usually larger than the size of the electrical components, the circuit board 4 is arranged in the middle of the accommodating cavity 12 in the vertical direction, and the width of the circuit board 4 is equal to or slightly smaller than the inner diameter of the outer cover 1, so that the radial size of the outer cover 1 can be further reduced while ensuring the space for arranging the electrical components, thereby reducing the radial size of the pressure sensor.

[0053] The circuit board 4 is provided with a first positioning groove, and the bracket 5 is provided with a first positioning column 52 , which is matched with the first positioning groove; the first positioning column 52 is inserted into the first positioning groove to realize the positioning between the circuit board 4 and the bracket 5 .

[0054] exist Figure 1 In the illustrated embodiment, the first positioning groove is arranged at the side of the circuit board 4 and corresponds to the side of the bracket 5, so that the first positioning groove is closer to the side of the circuit board 4, and the first positioning column 52 on the bracket 5 is closer to the inner wall of the outer cover 1, so that in the case of a pressure sensor of the same diameter, the space for installing electrical components enclosed by the bracket 5 and the circuit board 4 is larger. In other words, while ensuring the installation space of the electrical components, the present application can reduce the size of the circuit board 4 and the bracket 5 by arranging the first positioning groove at a position closer to the side of the circuit board 4, thereby reducing the radial size of the pressure sensor.

[0055] exist Figure 1 In the illustrated embodiment, a step-shaped notch is formed on the side of the circuit board 4, and the step-shaped notch serves as a first positioning groove. Compared with setting a through hole as the first positioning groove, the position of the first positioning groove is closer to the side of the circuit board 4, so that the size of the circuit board 4 and the bracket 5 can be reduced while ensuring the installation space of the electrical components, thereby reducing the radial size of the pressure sensor.

[0056] The first positioning column 52 is an integral structure with the bracket 5. The first positioning column 52 is arranged at the opening of the semicircular structure and extends upward, so that the first positioning column 52 can pass through the first positioning groove, and the structure of the bracket 5 is simpler and convenient to produce. There are multiple first positioning columns 52 and first positioning grooves, and the positions of the multiple first positioning columns 52 and the multiple first positioning grooves correspond to each other and cooperate with each other to improve the accuracy of positioning the circuit board 4.

[0057] In one embodiment, the bracket 5 is provided with a hollow hole 53 at the semicircular structure. When the circuit board 4 is installed on the bracket 5 by the automated processing equipment, the hollow hole 53 can be used to locate the bracket 5 and the workstation of the automated processing equipment, making the pressure sensor more convenient in automated production. The provision of the hollow hole 53 can also reduce the weight of the bracket 5.

[0058] The bracket 5 is further provided with a second positioning groove 54 , and the second positioning groove 54 is used for connecting with the connecting seat 6 .

[0059] When producing the bracket 5, a metal sheet is used to cut a corresponding plane shape, and a second positioning structure 51, a first positioning column 52, a second positioning groove 54 and a hollow hole 53 are punched out to form a bracket structure (a plane shape) in an expanded state, and then the bracket structure in the expanded state is bent to form a final three-dimensional bracket 5, so that the production of the bracket 5 is convenient and the production cost is low.

[0060] In one embodiment, the bracket 5, the pressure seat 2 and the outer cover 1 are all conductive structures, the circuit board 4 is provided with a soldering pad, the bracket 5 is provided with a contact portion 55, the contact portion 55 is welded to the soldering pad, the bracket 5 is electrically connected to the pressure seat 2, so that the bracket 5, the pressure seat 2 and the outer cover 1 form a ground connection path for the circuit board 4, so that there is no need to set up a grounding line separately, thereby making the structure of the pressure sensor simpler. Among them, when the first positioning column 52 is inserted into the first positioning groove 41, the contact portion 55 fits with the soldering pad, that is, the cooperation between the first positioning column 52 and the first positioning groove 41 also plays a positioning role between the contact portion 55 and the soldering pad, so that the connection between the circuit board 4 and the bracket 5 is more reliable. Moreover, the bracket 5 and the circuit board 4 can be welded by SMT, which makes the process simple and convenient for production.

[0061] See also Figures 1 to 3 Also see Figures 7 to 9, the connection seat 6 is arranged on the side of the bracket 5 away from the pressure seat 2. The connection seat 6 is provided with a second positioning column 61 protruding from one end of the bracket 5, and the second positioning column 61 extends along the axial direction of the outer cover 1. The second positioning column 61 is arranged in cooperation with the second positioning groove 54, and the connection seat 6 is inserted into the second positioning groove 54 of the bracket 5 through the second positioning column 61, so as to realize the alignment and connection between the connection seat 6 and the bracket 5. In other embodiments, the connection seat 6 can also be fixed to the bracket 5 by means of a buckle or a screw connection.

[0062] Preferably, the length of the second positioning column 61 is greater than the length of the circuit board 4 inserted into the receiving groove 62, so that when the connecting seat 6 is installed on the bracket 5 and one end of the circuit board 4 is inserted into the receiving groove 62, the second positioning column 61 and the second positioning groove 54 are first matched to achieve alignment, and the circuit board 4 is inserted into the receiving groove 62 to avoid the circuit board 4 colliding with the side wall of the receiving groove 62 to cause damage to the circuit board 4, thereby improving the reliability of the connection. In addition, when the pressure sensor is used in a vibrating environment, since the bracket 5 and the connecting seat 6 are positioned by the second positioning groove 54 and the second positioning column 61, the bracket 5 is prevented from moving relative to the connecting seat 6 to cause the circuit board 4 to collide with the side wall of the receiving groove 62.

[0063] The accommodating groove 62 is arranged at one end of the connecting base 6 facing the circuit board 4, and one end of the circuit board 4 is inserted into the accommodating groove 62. The accommodating cavity 63 is arranged at one end of the connecting base 6 away from the circuit board 4, and the first end 71 of the conductive connecting member 7 is located in the accommodating cavity 63.

[0064] The accommodating cavity 63 and the accommodating groove 62 partially overlap in the axial direction of the connecting seat 6, and the side of the accommodating cavity 63 is connected to the accommodating groove 62, so that the side of the first end 71 of the conductive connector 7 contacts the circuit board 4, and the electrical connection between the conductive connector 7 and the circuit board 4 is realized. Among them, the conductive connector 7 contacts the circuit board 4 through the side of the first end 71 to realize the electrical connection between the conductive connector 7 and the circuit board 4, so that there is no need to set a conductive seat on the circuit board 4 for abutting the end of the conductive connector 7, so that the structure of the circuit board 4 is simpler, and the electrical connection between the circuit board 4 and the connecting seat 6 is more convenient.

[0065] In one embodiment, an inclined surface 631 is provided at one end of the accommodating cavity 63 close to the circuit board 4, and the inclined surface 631 is inclined from the inside to the outside in a direction away from the circuit board 4, that is, the diameter of the end of the accommodating cavity 63 away from the circuit board 4 is larger than the diameter of the end of the accommodating cavity 63 close to the circuit board 4. The inclined surface 631 can press the first end 71 of the conductive connector 7 so that the first end 71 is in close contact with the circuit board 4, so that the conductive connector 7 and the circuit board 4 are kept in an electrically connected state, and the reliability of the electrical connection between the conductive connector 7 and the circuit board 4 is ensured.

[0066] The connecting base 6 is provided with a third positioning groove 64 , and the third positioning groove 64 is communicated with an end surface of the connecting base 6 which faces away from the circuit board 4 .

[0067] See also Figures 1 to 3 , the end cap 8 is connected to the side of the connection base 6 away from the bracket 5. The end cap 8 is in conflict with the limiting structure 11 on the outer cover 1, so that the strain gauge 3, the circuit board 4, the bracket 5, the connection base 6, the conductive connector 7 and the end cap 8 are limited between the pressure base 2 and the limiting structure 11. In other embodiments, the end cap 8 can also be fixed to the connection base 6 by snap-fit ​​or screw connection.

[0068] The end cover 8 is provided with a third positioning column 81 protruding on one side facing the pressure seat 2, and the third positioning column 81 extends along the axial direction of the outer cover 1. The third positioning column 81 is provided in cooperation with the third positioning groove 64, and the end cover 8 is inserted into the third positioning groove 64 of the connecting seat 6 through the third positioning column 81, so as to realize the alignment and connection between the end cover 8 and the connecting seat 6.

[0069] The first end 71 of the conductive connector 7 is elastic in its axial direction, and the first end 71 of the conductive connector 7 abuts between the connecting seat 6 and the end cover 8. When the pressure seat 2 is welded and connected to the outer cover 1, the first end 71 of the conductive connector 7 is in a compressed state, and pushes the end cover 8 to abut against the limiting structure 11, ensuring that the outer cover 1 and the end cover 8 are tightly matched, ensuring that there is no gap inside that can shake, so as to eliminate the influence caused by the processing error and improve the reliability of the connection between the bracket 5, the connecting seat 6 and the end cover 8. In other words, there can be certain processing errors between the bracket 5 and the connecting seat 6, and between the connecting seat 6 and the end cover 8 of the present application, so that the accuracy of the axial dimensions of the bracket 5, the connecting seat 6 and the end cover 8 can be reduced, thereby reducing the processing difficulty of the pressure sensor and reducing the processing cost.

[0070] In a preferred embodiment, the length of the third positioning column 81 is greater than the length of the first end 71 of the conductive connector 7 in a natural state, so that when the first end 71 of the conductive connector 7 is in a non-compressed state, the third positioning column 81 is also in a mating state with the third positioning groove 64, so that before an assembly component formed by the pressure seat 2, the strain gauge 3, the circuit board 4, the bracket 5, the connecting seat 6, the conductive connector 7 and the end cover 8 is installed in the outer cover 1, the end cover 8 and the connecting seat 6 are already in a mating state, so as to ensure the position accuracy between the end cover 8, the conductive connector 7 and the connecting seat 6 during the installation of the assembly component in the outer cover 1, thereby reducing the difficulty of assembling the pressure sensor.

[0071] In one embodiment, the diameter of the end cap 8 is adapted to the diameter of the accommodating cavity 12, and the end cap 8 is slidably connected in the accommodating cavity 12, so that after the end cap 8 is installed in the accommodating cavity 12, the end cap 8 cannot move in the radial direction of the outer cover 1, thereby ensuring the position accuracy of the conductive connector 7 and the connecting seat 6 arranged in cooperation with the end cap 8. The limiting structure 11 on the outer cover 1 is annular, and the inner diameter of the limiting structure 11 is smaller than the diameter of the end cap 8. When the end cap 8 is installed on the outer cover 1, the end of the end cap 8 away from the limiting structure 11 can be installed in the accommodating cavity 12, and moved along the axial direction of the accommodating cavity 12 to the position where the limiting structure 11 abuts, so as to block the end of the accommodating cavity 12 away from the pressure seat 2.

[0072] In other embodiments, the limiting structure 11 may also be configured in other shapes, such as a block shape. In other embodiments, the end cap 8 may also be fixed to the outer cover 1 by screw connection or glue bonding, without the need to configure the limiting structure 11 on the outer cover 1.

[0073] See also Figures 10 to 12 A limiting groove 82 is provided on one end face of the end cover 8 that faces away from the accommodating chamber 12. The limiting groove 82 is connected to the circumferential outer surface of the end cover 8 and is adapted to the limiting structure 11, so that after the end cover 8 is installed on the outer cover 1, the outer end face of the end cover 8 that faces away from the accommodating chamber 12 is flush with one end face of the outer cover 1, making the structure of the outer cover 1 more compact, thereby reducing the axial length of the pressure sensor. Figure 1 In the illustrated embodiment, the limiting groove 82 is annular.

[0074] The end cover 8 is provided with a plurality of mounting holes 83 at intervals, and the number of the mounting holes 83 matches the number of the conductive connectors 7 and the positions correspond one to one, for example, 2, 3 or 4. The mounting holes 83 are connected to the two end surfaces of the end cover 8 along the axial direction of the accommodating cavity 12, so that the second end 72 of the conductive connector 7 can pass through the mounting holes 83 and extend to the outside of the housing.

[0075] In one embodiment, the mounting hole 83 may be a stepped hole. That is, the mounting hole 83 includes a first through hole section 831 and a second through hole section 832 connected to each other. The first through hole section 831 is arranged at one end of the end cover 8 facing the inside of the accommodating cavity 12, and the position of the first through hole section 831 corresponds to the position of the accommodating cavity 63. The diameter of the first through hole section 831 is greater than or equal to the diameter of the first end 71 of the conductive connector 7. In this way, the first end 71 of the conductive connector 7 can be inserted into the first through hole section 831, so as to reduce the axial size required for the accommodating cavity 63 of the connecting seat 6 for mounting the first end 71 of the conductive connector 7, thereby reducing the axial size of the connecting seat 6 and the axial size of the pressure sensor. The second through hole section 832 is arranged at one end of the end cover 8 away from the inside of the accommodating cavity 12, and the diameter of the second through hole section 832 is adapted to the diameter of the second end 72 of the conductive connector 7, and the diameter of the second through hole section 832 is smaller than the diameter of the first through hole section 831. The second end 72 of the conductive connecting member 7 passes through the second through-hole section 832 and is located outside the outer cover 1 .

[0076] Preferably, the diameter of the second through hole section 832 is equal to the diameter of the second end 72 of the conductive connector 7, so that after the second end 72 of the conductive connector 7 is inserted into the second through hole section 832, the end cap 8 can limit the position of the conductive connector 7. For example: when the conductive connector 7 is installed on the end cap 8 and then connected to the connection seat 6, since the end cap 8 can limit the conductive connector 7, when the third positioning column 81 of the end cap 8 cooperates with the third positioning groove 64 of the connection seat 6, the alignment between the conductive connector 7 and the accommodating cavity 63 is achieved at the same time, reducing the difficulty of assembly. Moreover, since the inner wall of the second through hole section 832 of the end cap 8 contacts the second end 72 of the conductive connector 7 to limit the position of the second end 72 of the conductive connector 7, the second end 72 of the conductive connector 7 is limited to a set position, thereby improving the reliability of the electrical connection between the conductive connector 7 and the external circuit.

[0077] In other embodiments, the mounting hole 83 may also be a through hole with the same diameter at all locations. The first end 71 of the conductive connector 7 abuts against an end surface of the end cap 8 close to the connection seat 6 , and the second end 72 of the conductive connector 7 passes through the mounting hole 83 to the outside of the outer cover 1 .

[0078] See also Figures 1 to 3 In one embodiment, the conductive connector 7 is a spring structure, and the diameter of the first end 71 of the conductive connector 7 is larger than the diameter of the second end 72 of the conductive connector 7, so that the first end 71 of the conductive connector 7 can abut between the connecting seat 6 and the end cover 8, and the second end 72 of the conductive connector 7 passes through the mounting hole 83 of the end cover 8 to extend out of the outer cover 1.

[0079] The first end 71 of the conductive connector 7 is elastic in its radial direction, and the first end 71 of the conductive connector 7 is in contact with the inclined surface 631, so that the first end 71 is elastically deformed under the pressure of the inclined surface 631 to be in close contact with the circuit board 4, thereby maintaining the conductive connector 7 and the circuit board 4 in an electrically connected state, thereby ensuring the reliability of the electrical connection between the conductive connector 7 and the circuit board 4.

[0080] Among them, there are multiple conductive connectors 7, and the multiple conductive connectors 7 are arranged at intervals, and the first ends 71 ​​of the multiple conductive connectors 7 are respectively contacted and arranged on the upper and lower sides of the circuit board 4, so that the conductive connectors 7 located on the lower and upper sides of the circuit board 4 clamp the circuit board 4, ensuring the stability of the electrical connection between the circuit board 4 and the conductive connectors 7, and the structure is simple.

[0081] In a preferred embodiment, the conductive connector 7 is configured as three, and the three conductive connectors 7 are respectively a first conductive connector 701, a second conductive connector 702 and a third conductive connector 703. The first conductive connector 701 is arranged on the upper side of the circuit board 4, and the second conductive connector 702 and the third conductive connector 703 are arranged on the lower side of the circuit board 4. The first conductive connector 701, the second conductive connector 702 and the third conductive connector 703 are distributed in an equilateral triangle, so that the clamping force applied by the first conductive connector 701, the second conductive connector 702 and the third conductive connector 703 on the circuit board 4 is in a balanced state, ensuring the stability of the electrical connection between the circuit board 4 and the conductive connector 7; and making the distribution of the conductive connector 7 on the connecting seat 6 more reasonable, so as to ensure the uniform wall thickness between each accommodating cavity 63.

[0082] In other embodiments, the distance between the first conductive connector 701 and the second conductive connector 702 is equal to the distance between the first conductive connector 701 and the third conductive connector 703, so that the first conductive connector 701, the second conductive connector 702 and the third conductive connector 703 are distributed in an isosceles triangle, so that the clamping force applied by the first conductive connector 701, the second conductive connector 702 and the third conductive connector 703 on the circuit board 4 is in a balanced state. In other embodiments, the number of the conductive connectors 7 may also be 2, 4 or more.

[0083] The first end 71 of the conductive connector 7 is elastic in its axial direction, and when the pressure seat 2 is welded to the outer cover 1, the first end 71 of the conductive connector 7 is in a compressed state, so that the first end 71 of the conductive connector 7 elastically abuts between the connecting seat 6 and the end cover 8 to ensure that the outer cover 1 and the end cover 8 are tightly matched, ensuring that there is no gap inside that can shake, thereby improving the stability of the internal structure of the pressure sensor.

[0084] In other embodiments, the first end 71 of the conductive connecting member 7 is a spring structure, and the second end 72 of the conductive connecting member 7 may be a rod-shaped structure without elasticity.

[0085] In one embodiment, the conductive connector 7 is made of 304 stainless steel, which has good elasticity and fatigue limit capacity to ensure the reliability of the electrical connection between the conductive connector 7 and the circuit board 4. In other embodiments, the conductive connector 7 may also be a conductive metal structure of other materials.

[0086] A soldering pad is provided on the circuit board 4 at a position corresponding to the conductive connector 7 , and the side surface of the conductive connector 7 is tightly fitted with the soldering pad, so that the circuit inside the circuit board 4 can be electrically connected to the conductive connector 7 through the soldering pad.

[0087] The assembly process of the pressure sensor of this application is: First, the circuit board 4 is mounted on the bracket 5 , the bracket 5 and the strain gauge 3 are fixed on the pressure seat 2 , and the strain gauge 3 is electrically connected to the circuit board 4 .

[0088] Then, the connecting seat 6 is plugged into the second positioning groove 54 of the bracket 5 through the second positioning column 61 , and one end of the circuit board 4 is inserted into the accommodating groove 62 .

[0089] Next, the second end 72 of the conductive connector 7 is passed through the mounting hole 83 on the end cover 8, and the end cover 8 is inserted into the third positioning groove 64 of the connection seat 6 through the third positioning column 81, and the conductive connector 7 is installed in the accommodating cavity 63 of the connection seat 6, so that the pressure seat 2, the strain gauge 3, the circuit board 4, the bracket 5, the connection seat 6, the conductive connector 7 and the end cover 8 form an assembly component. Among them, the strain gauge 3, the circuit board 4, the bracket 5, the connection seat 6, the conductive connector 7 and the end cover 8 are the circuit assembly structure of the pressure sensor. Since the first end 71 of the conductive connector 7 has compressible elasticity along its axial direction, the length of the circuit assembly structure composed of the strain gauge 3, the circuit board 4, the bracket 5, the connection seat 6, the conductive connector 7 and the end cover 8 is greater than the length of the outer cover 1. Moreover, the pressure seat 2, the strain gauge 3, the circuit board 4, the bracket 5, the connection seat 6, the conductive connector 7 and the end cover 8 are assembled on the outside of the outer cover 1, so that there is no obstruction of the outer cover 1 during assembly, thereby making assembly more convenient.

[0090] Finally, the outer cover 1 is put on the outside of the assembly component formed in the previous steps, and is welded and fixed to the connecting portion 21 of the pressure seat 2 to realize the assembly of the pressure sensor as a whole. After the outer cover 1 is welded to the pressure seat 2, the limiting structure 11 of the outer cover 1 abuts against the end cover 8 and compresses the first end 71 of the conductive connector 7, so that the length of the circuit assembly structure after the strain gauge 3, the circuit board 4, the bracket 5, the connecting seat 6, the conductive connector 7 and the end cover 8 are assembled is limited to the length range of the outer cover 1, and the conductive connector 7 is in a compressed state, thereby making the overall structure of the pressure sensor compact in the axial direction, ensuring that there is no gap inside the pressure sensor that can shake, so as to eliminate the influence of the processing error, and the assembly is convenient.

[0091] The strain gauge 3 and the circuit board 4 are electrically connected via a binding wire. In some embodiments, after the strain gauge 3 and the circuit board 4 are electrically connected, the binding wire between the strain gauge 3 and the circuit board 4 is covered with silicone gel 9, which protects the binding wire and prevents the binding wire from being disconnected, and prevents the connection between the binding wire and the strain gauge 3 and the circuit board 4 from being disconnected, thereby improving the reliability of the electrical connection between the strain gauge 3 and the circuit board 4, and enabling the pressure sensor to be suitable for use in an environment with large vibrations.

[0092] The pressure sensor of the present application includes an outer cover 1, a pressure seat 2 connected to one end of the outer cover 1, a strain gauge 3 connected to the pressure seat 2, a circuit board 4 arranged in the outer cover 1 and electrically connected to the strain gauge 3, a connection seat 6 arranged in the outer cover 1 and connected to the circuit board 4, and a conductive connector 7 connected to the connection seat 6, and the conductive connector 7 is used to connect the circuit board 4 and an external circuit. Among them, the length of the circuit board 4 is arranged along the axial direction of the accommodating cavity 12 of the outer cover 1 to reduce the radial size of the pressure sensor and facilitate the arrangement of the pressure sensor on the pipeline or valve body. Moreover, a receiving groove 62 is provided on one end surface of the connecting seat 6 facing the circuit board 4, and a receiving cavity 63 is provided on one end surface of the connecting seat 6 facing away from the circuit board 4. The receiving cavity 63 partially overlaps with the receiving groove 62 in the axial direction of the connecting seat 6, and the side of the receiving cavity 63 is connected with the receiving groove 62. One end of the circuit board 4 is inserted into the receiving groove 62, and the first end 71 of the conductive connector 7 is located in the receiving cavity 63, and the side of the first end 71 of the conductive connector 7 is in contact and connected with the circuit board 4 under the restriction of the receiving cavity 63, so that the electrical connection structure between the conductive connector 7 and the circuit board 4 is simple, thereby making the overall production of the pressure sensor more convenient and lower in cost.

[0093] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A pressure sensor, characterized in that: include: An outer cover, wherein a receiving cavity is formed inside the outer cover; A pressure seat connected to one end of the outer cover, a pressure-inducing hole with one end open is formed on the pressure seat, and the other end of the pressure seat is a closed end, and the closed end is accommodated in the accommodating cavity; A strain gauge is disposed in the accommodating cavity and at a closed end of the pressure seat; A circuit board is arranged in the accommodating cavity and close to the strain gauge, the length direction of the circuit board is arranged along the axial direction of the accommodating cavity, and the strain gauge is electrically connected to the circuit board; A connecting seat is arranged in the accommodating cavity and is arranged near the other end of the outer cover, and an accommodating groove is arranged on one end surface of the connecting seat facing the circuit board, and one end of the circuit board is inserted into the accommodating groove; an accommodating cavity is arranged on one end surface of the connecting seat away from the circuit board, and the accommodating cavity and the accommodating groove partially overlap in the axial direction of the connecting seat, and the side surface of the accommodating cavity is communicated with the accommodating groove; A conductive connector includes a first end and a second end connected to each other, wherein the first end is located in the accommodating cavity, the diameter of the first end is greater than the diameter of the second end, and the side surface of the first end is electrically connected to the circuit board; the second end passes through the accommodating cavity to be electrically connected to an external circuit.

2. The pressure sensor according to claim 1, characterized in that: An inclined surface is provided at one end of the accommodating cavity close to the circuit board, and the inclined surface is inclined from the inside to the outside in a direction away from the circuit board; The first end has elasticity in the radial direction thereof, and the first end is in contact with the inclined surface, and the inclined surface presses the first end so that the first end is in close contact with the circuit board.

3. The pressure sensor according to claim 2, characterized in that: There are a plurality of conductive connecting members, the plurality of conductive connecting members are arranged at intervals, and the first ends of the plurality of conductive connecting members are respectively contacted and arranged at the upper and lower sides of the circuit board.

4. The pressure sensor according to claim 3, characterized in that: The conductive connecting members are configured in three numbers, one of which is arranged on the upper side of the circuit board, and the other two are arranged on the lower side of the circuit board, and the three conductive connecting members are distributed in an equilateral triangle.

5. The pressure sensor according to claim 1, characterized in that: The pressure sensor further comprises a bracket, which is arranged between the pressure seat and the connecting seat, and one end of the bracket is fixedly connected to the pressure seat, and the other end of the bracket is connected to the connecting seat; The circuit board is mounted on the bracket, and the circuit board and the strain gauge are located in the same plane to reduce the bending angle of the binding line between the strain gauge and the circuit board.

6. The pressure sensor according to claim 5, characterized in that: The circuit board is provided with a first positioning groove; the bracket is provided with a first positioning column, the extension direction of the first positioning column is perpendicular to the axial direction of the accommodating cavity, and the first positioning column is arranged in cooperation with the first positioning groove; the first positioning column is inserted into the first positioning groove.

7. The pressure sensor according to claim 5, characterized in that: The pressure seat is provided with a first positioning structure, the bracket is provided with a second positioning structure, and the second positioning structure is arranged in close contact with the first positioning structure so that the circuit board and the strain gauge are located in the same plane; and / or The bracket is provided with a second positioning groove, and the connecting seat is provided with a second positioning column protruding toward one end of the bracket, and the second positioning column extends along the axial direction of the outer cover; the second positioning column is matched with the second positioning groove to connect the connecting seat to the bracket.

8. The pressure sensor according to claim 1, characterized in that: The pressure sensor further includes an end cover, which is disposed on a side of the connection base away from the circuit board and is connected to the connection base; The first end of the conductive connector is elastic in the axial direction thereof, and the first end of the conductive connector is abutted between the connection seat and the end cover, and the second end of the conductive connector passes through the end cover.

9. The pressure sensor according to claim 8, characterized in that: The connecting seat is provided with a third positioning groove, and a third positioning column is provided on a side of the end cover protruding toward the pressure seat, and the third positioning column extends along the axial direction of the outer cover; the third positioning column is matched with the third positioning groove to connect the end cover to the connecting seat.

10. The pressure sensor according to claim 1, characterized in that: The pressure seat comprises a connecting portion and a pressure measuring portion arranged on the connecting portion, the connecting portion is connected to the outer cover, the pressure measuring portion is arranged at one end of the connecting portion facing the connecting seat, the pressure-inducing hole penetrates the connecting portion and forms a blind hole on the pressure measuring portion; an elastic film surface is formed on one side of the pressure measuring portion, and the strain gauge is arranged on the elastic film surface; and / or The pressure seat is a metal injection-molded integral structure.

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