阅读说明：本技术 一种压力变送器及其组装方法 (Pressure transmitter and assembling method thereof ) 是由 王刚 徐东 魏娜 潘骏驰 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种压力变送器及其组装方法,包括Core模块和连接器插头；Core模块包括同轴依次连接的基座、压力传感器和PCB组件,基座包括底座和金属圆筒,压力传感器位于底座顶部,且位于金属圆筒中,底座顶部设置有传感器定位槽；金属圆筒朝向PCB组件的端部设置有卡槽,PCB组件朝向金属圆筒的端部设置有径向的凸点；连接器插头包括同轴依次连接的壳体、电气连接插座、pogo pin和电气连接插针,电气连接插座采用一体化注塑成型；PCB组件远离基座的端部位于壳体中与pogo pin连接,PCB组件远离基座的端部设置有插头定位槽。可实现自动化生产的结构制造和适用于标定自动化产线上使用。(The invention discloses a pressure transmitter and an assembling method thereof, wherein the pressure transmitter comprises a Core module and a connector plug; the Core module comprises a base, a pressure sensor and a PCB assembly which are coaxially and sequentially connected, the base comprises a base and a metal cylinder, the pressure sensor is positioned at the top of the base and is positioned in the metal cylinder, and a sensor positioning groove is formed in the top of the base; the end part of the metal cylinder, which faces the PCB assembly, is provided with a clamping groove, and the end part of the PCB assembly, which faces the metal cylinder, is provided with a radial convex point; the connector plug comprises a shell, an electrical connection socket, a pogo pin and an electrical connection contact pin which are coaxially and sequentially connected, and the electrical connection socket is integrally formed by injection molding; the end portion of the PCB assembly far away from the base is located in the shell and connected with the pogo pin, and the end portion of the PCB assembly far away from the base is provided with a plug positioning groove. The structure capable of realizing automatic production is manufactured and is suitable for being used on a calibration automatic production line.)

1. Pressure transmitter, characterized in that it comprises a Core module (1) and a connector plug (2);

the Core module (1) comprises a base (3), a pressure sensor (4) and a PCB assembly (5) which are coaxially and sequentially connected, wherein the base (3) comprises a base and a metal cylinder, the pressure sensor (4) is positioned at the top of the base and positioned in the metal cylinder, and a sensor positioning groove is formed in the top of the base; a clamping groove is formed in the end part, facing the PCB component (5), of the metal cylinder, and radial salient points are formed in the end part, facing the metal cylinder, of the PCB component (5);

the connector plug (2) comprises a shell (6), an electrical connection socket (8), a pogo pin (9) and an electrical connection contact pin (7) which are coaxially and sequentially connected, and the electrical connection socket (8) is integrally formed by injection molding;

the end part of the PCB assembly (5) far away from the base (3) is positioned in the shell (6) and connected with the pogo pin (9), and the end part of the PCB assembly (5) far away from the base (3) is provided with a plug positioning groove.

2. Pressure transmitter according to claim 1, characterized in that the metal cylinder is turned radially inwards towards the end of the PCB assembly (5) to crimp the bottom of the PCB assembly (5).

3. Pressure transmitter according to claim 1, characterized in that the PCB assembly (5) comprises a bottom layer PCB, a top layer PCB and connecting copper posts, both the bottom layer PCB and the top layer PCB being connected to the connecting copper posts, the bottom layer PCB being connected to the metal cylinder, the top layer PCB being connected to pogo pins (9).

4. Pressure transmitter according to claim 3, characterized in that gold-plated fingers are arranged on the top layer PCB, and that the top layer PCB is connected to pogo pins (9) by means of the gold-plated fingers.

5. Pressure transmitter according to claim 1, characterized in that the housing (6) is provided with radial flanges and rotation-stopping indentations at its connection to the electrical connection socket (8).

6. Pressure transmitter according to claim 1, characterized in that the electrical connection socket (8) is provided with modular ventilation holes.

7. Pressure transmitter according to claim 1, characterized in that when the electrical connection pin (7) is a solenoid valve plug, the end of the electrical connection pin (7) is L-shaped and press-riveted with the pogo pin (9).

8. Pressure transmitter according to claim 1, characterized in that when the electrical connection pin (7) is an M12 circular aviation plug, the end of the electrical connection pin (7) is connected with a connector, the electrical connection pin (7) and the connector are in an L-shaped structure, and the connector is connected with a pogo pin (9) by riveting.

9. Pressure transmitter according to claim 1, characterized in that the housing (6) is made of stainless steel, the electrical connection pins (7) are made of brass or tin bronze and the pogo pins (9) are made of brass.

10. A method of assembling a pressure transmitter according to any one of claims 1 to 9, comprising the steps of;

the base (3) and the pressure sensor (4) are positioned and assembled by identifying a sensor positioning groove on the base (3) and an oil filling hole, a pin or a steel ball of the pressure sensor (4), and the base (3) and the pressure sensor (4) are fixed and sealed by end face laser welding;

clamping the salient points of the PCB assembly (5) and the clamping grooves of the metal cylinders, assembling the PCB assembly (5) and the base (3), and riveting and fixing; welding Kovar pins of the pressure sensor (4) and the PCB assembly (5) through holes;

after the pogo pin (9) and the electrical connection pin (7) are assembled, the assembled pogo pin (9) and the electrical connection pin (7) and the shell (6) are subjected to integrated injection molding to form an electrical connection socket (8);

the end part of the PCB assembly (5) far away from the base (3) is inserted into the shell (6) to be connected with the pogo pin (9), and then the base (3) and the shell (6) are welded.

Technical Field

The invention belongs to the field of pressure transmitters, and relates to a pressure transmitter and an assembling method thereof.

Background

A pressure transmitter is a sensor-based device that converts a pressure signal into an electrical signal, and is widely used in various fields such as industry, construction, military, medical treatment, etc. since it converts pressure into visual data.

The pressure transmitter on the market generally comprises a pressure sensor, a circuit board, a base, a shell, an electrical connector, an external connector and the like, wherein an electrical element is arranged in the base and the shell, the base and the shell are fixed in glue pouring solidification, welding, threads and other modes, and the electrical connection is completed in a welding line or welding electrical connector and other modes. Meanwhile, due to the application characteristics of the pressure transmitter, the diversity required by customers is higher, the customization degree is higher, the diversity of the structure is more, and the realization of automatic production is difficult. However, with the development of the society towards intellectualization and automation, the demand of the pressure transmitter is increasing, the production mode of manual assembly cannot be met at present, the automatic production of the pressure transmitter is not accessible, but the common structure cannot be met at present and is not suitable for mechanical automatic production such as mechanical identification, mechanical picking and assembling and the like. Therefore, a pressure transmitter with a simple structure, most importantly, suitable for automatic production is urgently needed to meet the future development.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a pressure transmitter and an assembling method thereof, which are in modular design, can realize structural manufacturing of automatic production and are suitable for being used on a calibration automatic production line.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a pressure transmitter comprising a Core module and a connector plug;

the Core module comprises a base, a pressure sensor and a PCB assembly which are coaxially and sequentially connected, the base comprises a base and a metal cylinder, the pressure sensor is positioned at the top of the base and is positioned in the metal cylinder, and a sensor positioning groove is formed in the top of the base; the end part of the metal cylinder, which faces the PCB assembly, is provided with a clamping groove, and the end part of the PCB assembly, which faces the metal cylinder, is provided with a radial convex point;

the connector plug comprises a shell, an electrical connection socket, a pogo pin and an electrical connection contact pin which are coaxially and sequentially connected, and the electrical connection socket is integrally formed by injection molding;

the end portion of the PCB assembly far away from the base is located in the shell and connected with the pogo pin, and the end portion of the PCB assembly far away from the base is provided with a plug positioning groove.

Preferably, the metal cylinder is turned radially inward toward the end of the PCB assembly, crimping the bottom of the PCB assembly.

Preferably, the PCB assembly comprises a bottom PCB, a top PCB and a connecting copper column, the bottom PCB and the top PCB are connected with the connecting copper column, the bottom PCB is connected with the metal cylinder, and the top PCB is connected with a pogo pin.

Further, gold-plated fingers are arranged on the top layer PCB, and the top layer PCB is connected with the pogopin through the gold-plated fingers.

Preferably, the housing is provided with radial flanges and rotation-stopping notches at the connection between the housing and the electrical connection socket.

Preferably, the electrical connection socket is provided with a modular vent.

Preferably, when the electrical connection contact pin is the solenoid valve plug, the end of the electrical connection contact pin is L-shaped, and the end is connected with the pogo pin in a press riveting mode.

Preferably, when the electrical connection contact pin is the circular aviation plug of M12, electrical connection contact pin end-to-end connection has the connecting piece, and electrical connection contact pin and connecting piece are L type structure, and connecting piece and pogo pin are riveted and connected.

Preferably, the housing is made of stainless steel, the electrical connection pins are made of brass or tin bronze, and the pogopin is made of brass.

An assembling method of the pressure transmitter according to any one of the above claims, comprising the following processes;

the base and the pressure sensor are positioned and assembled by identifying the sensor positioning groove and the pressure sensor oil filling hole, the pin or the steel ball on the base, and the base and the pressure sensor are fixed and sealed by end face laser welding;

clamping the salient points of the PCB assembly and the clamping grooves of the metal cylinders, assembling the PCB assembly and the base, and performing spot riveting and fixing; welding a Kovar pin of the pressure sensor and a through hole of the PCB assembly;

after the pogo pin and the electrical connection contact pin are assembled, the assembled pogo pin and the electrical connection contact pin are subjected to integrated injection molding with the shell to form an electrical connection socket;

and inserting the end part of the PCB assembly far away from the base into the shell to be connected with the pogo pin, and then welding the base and the shell.

Compared with the prior art, the invention has the following beneficial effects:

the invention simplifies the structure of the whole product into two parts, has modular design, can be freely combined, meets various requirements of customers, and solves the problem that the automatic production cannot be realized due to structural diversity caused by more customer requirements; the electrical connection socket 8 is integrally formed by injection molding, so that a conventional manual assembly part is integrated into a part by an integral molding process, the problem of poor sealing performance caused by manual assembly is solved, and the electrical connection socket becomes a key part for automatic production of the pressure transmitter; through the location structure on each part to optimize the electrical connection that conventional wire or plug-in components carried out for pogo pin hard joint, can avoid complicated processes such as artifical bonding wire, the assembly is simple, makes pressure transmitter more be fit for automated production.

Furthermore, the PCB assembly can be fixed on the metal cylinder through the flanging, and the metal part of the PCB assembly is in contact with the metal cylinder to realize the functions of shielding signals and protecting a circuit.

Furthermore, the bottom layer PCB and the top layer PCB are both connected with the connecting copper columns, and an insulation and voltage-resistant leakage path is added to protect electronic elements at the rear end from being damaged by voltage-resistant breakdown and filter common-mode interference.

Furthermore, the top layer PCB board is connected with the pogo pin through the gold-plated finger, so that the electrical connection is more stable and durable, and the PCB is suitable for being used on a calibration automation production line.

Furthermore, the shell forms mechanical engagement and physical adsorption through a radial flanging and a rotation stopping notch of the shell, and is compounded to form a continuum in mechanics, so that higher structural strength is shown, the problem of poor connection reliability and sealing performance caused by stress concentration caused by the corresponding expansion coefficients of the shell and the electrical connection socket is solved, and the axial drawing force and the radial torque of the connector plug are improved.

Furthermore, the modularized air holes arranged on the electrical connection socket can meet two application requirements of absolute pressure and gauge pressure.

Drawings

FIG. 1 is a schematic diagram of two pressure transmitters of the present invention;

FIG. 2 is a schematic structural diagram of a Core module of the present invention;

fig. 3 is a schematic structural diagram of two connector plugs of the present invention.

Wherein: 1-Core module; 2-connector plug; 3-a base; 4-a pressure sensor; 5-a PCB assembly; 6-a shell; 7-electrical connection pins; 8-an electrical connection socket; 9-pogo pin.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1, the present invention provides a pressure transmitter which is fully suitable for automated production, and mainly comprises two parts, a Core module 1 and a connector plug 2. Modular design, the integrated Core A subassembly of spare part that will need dispose according to customer's demand, all the other standardized parts are integrated as an organic whole, thereby solved because of the structure variety that customer variety needs and lead to can't carry out automated production, whole mechanism designs have the location screens structure, and no wire is connected, and the all-welded structure can realize automated production's structural manufacturing and be applicable to and mark and use on the automation line.

Core module 1 contains coaxial base 3, pressure sensor 4 and the PCB subassembly 5 that connects gradually, and base 3 includes base and metal drum, and pressure sensor 4 is located the base top, and is located the metal drum, and the base top is provided with the sensor constant head tank, and pressure sensor 4 corresponds the constant head tank and packs into in base 3.

As shown in fig. 2, the PCB assembly 5 includes a bottom PCB, a top PCB and a connecting copper column, the bottom PCB in the PCB assembly 5 is placed in the metal cylinder of the base 3, the metal cylinder is provided with a clamping groove towards the end of the PCB assembly 5, the bottom PCB is provided with a radial bump, the bump of the bottom PCB is installed in the clamping groove of the base 3 to realize the axial positioning of the PCB assembly 5, the metal cylinder is turned inwards towards the end of the PCB assembly 5 to buckle the bottom of the PCB assembly 5. The end flanging of the metal cylinder of the base 3 is pressed on the bottom PCB of the PCB assembly 5, so that fixation can be realized, and the Kovar pins of the pressure sensor 4 and the bottom PCB are welded through holes by an automatic soldering machine. The gold-plated circle on bottom plate PCB board back and the contact of metal drum can realize shielding signal, protection circuit function, replace traditional artifical mode of twisting nut or manual welding shell fragment.

The PCB component 5 design breaks through the conventional electrical design, carries out module design on pressure signal acquisition, filtering, amplification and signal output, unifies a front end circuit, and does not receive the limitations of a transmitter on the measurement range, the output form, the precision requirement and the like. The bottom PCB board and the top PCB board are respectively provided with a pad through a common end with a high-voltage capacitor, one end of a connecting copper column is welded on the pad of the bottom PCB board, the other end of the connecting copper column is connected with the pad of the top PCB board, electrical connection and fixation are realized, the connecting copper column is in contact with a stainless steel shell 6, an insulating and pressure-resistant discharge passage is increased, so that electronic elements at the rear end are protected from being damaged by pressure-resistant breakdown, and filtering can be performed for common-mode interference.

For solving the problem of automatic calibration and manual wire bonding, a gold-plated finger is arranged on a top layer PCB in the PCB assembly 5, and the mode of connecting with the connector plug 2 through a pogo pin is adopted, so that the current signal wire in the market is abandoned, the electrical connection is more stable and durable, and the method is suitable for being used on a calibration automatic production line. And a plug positioning groove is formed in the top layer PCB.

As shown in fig. 3, the connector plug 2 includes a housing 6, an electrical connection pin 7, an electrical connection socket 8 and a pogo pin9 coaxially connected in sequence, the housing 6 is made of stainless steel, the electrical connection pin 7 is made of brass or tin bronze, the electrical connection socket 8 is made of plastic, and the pogo pin9 is made of brass. The electric connection contact pin 7 is connected with the pogo pin9 after being processed by mechanical pressing, pressure changing, bending, punching and other processes, the shell 6 is provided with a radial flanging and a rotation stopping notch at the connection part of the shell 6 and the electric connection socket 8, when in injection molding, a plastic solution flows, is extruded and penetrates into the flanging and rotation stopping notch concave-convex structure to be solidified, and then is tightly combined in the concave-convex structure, metal and plastic form mechanical meshing and physical adsorption, and a continuous body is formed in mechanics by compounding, so that higher structural strength is shown, the problem that the connection reliability and the sealing property are poor due to stress concentration caused by the corresponding expansion coefficients of the metal shell 6 and the plastic electric connection socket 8 is solved, and the axial drawing force and the radial torque of the connector plug 2 are improved.

The electrical connection contact pin 7, the pogo pin9 and the shell 6 are installed in an injection molding machine to be integrally injection-molded to form the electrical connection socket 8, and the electrical connection socket 8 is provided with modular air holes, so that two application requirements of absolute pressure and gauge pressure can be met. The connector plug 2 provided by the invention has the advantages that the parts needing manual assembly are converted into direct molding through a process, the problem of poor sealing performance caused by manual assembly is solved, the protection grade can reach IP65, more importantly, manual assembly is avoided in an automatic production line, and real automatic production is realized.

When the connector plug 2 is an electromagnetic valve plug, as shown in the left structure of fig. 1 and fig. 3, the electrical connection pin 7 is formed into an L-shaped structure through processes of blanking, stamping, bending and the like, the L-shaped end is punched, meanwhile, the tail end of the pogo pin9 is subjected to a reinforced structure design, the L-shaped structure end of the electrical connection pin 7 is punched, and the reinforced tail end of the pogo pin9 is connected through pressure riveting, so that the coaxiality and the connection reliability of the electrical connection pin 7 and the pogo pin9 can be ensured. The surfaces of the electrical connection pins 7 are cleaned, silvered and oxidized to increase the van der waals force between the metal and plastic molecules to achieve higher interfacial bonding strength between the electrical connection pins 7 and the electrical connection sockets 8.

When connector plug 2 is the circular aviation plug of M12, as the right structure of fig. 1 and 3, electrical connection contact pin 7 falls into the circular aviation electrical contact pin of M12 and connecting piece two parts, electrical contact pin is through machine addition type, the connecting piece is through stamping forming, electrical contact pin and connecting piece are connected through the pressure riveting and are formed L type structure, L type end punches a hole, carry out reinforced structure design to pogo pin 9's end simultaneously, electrical connection contact pin 7's L type structure end punches a hole and pogo pin 9's reinforcement end is connected through the pressure riveting, can ensure electrical connection contact pin 7 and pogo pin 9's axiality and connection reliability. The surfaces of the electrical connection pins 7 are cleaned and plated with gold to increase the van der waals force between the metal and plastic molecules, so as to obtain higher interface bonding strength between the electrical connection pins 7 and the electrical connection sockets 8.

Connector plug 2 assembles on Core module 1, and during the reference column of connector plug 2 inserted the plug constant head tank of PCB subassembly 5, accurate quick electric connection can be realized to this pogo pin9 that can guarantee connector plug 2 and the golden finger on the PCB subassembly 5, off normal and card pause phenomenon do not appear, and more importantly is convenient for fast accurate realization automated assembly in the automation line. Connector plug 2 and Core module 1 carry out circumference laser welding, specifically carry out circumference laser welding with base 3 and casing 6, realize that the complete machine is sealed and accomplish.

The assembling method of the pressure transmitter comprises the following processes:

the core body positioning is realized by the laser equipment or the camera shooting identification equipment through the positioning groove on the identification base 3 and the oil filling hole, the pin or the steel ball of the pressure sensor 4, and the fixing and the sealing of the pressure sensor 4 and the base 3 are realized through the laser welding of the end face.

Clamping the salient points of the PCB component 5 and the clamping grooves of the metal cylinders, assembling the PCB component 5 and the base 3, and performing spot riveting and fixing through a spot riveting machine; and (3) welding Kovar pins of the pressure sensor 4 and the PCB assembly 5 through via holes of an automatic tin soldering machine to realize electrical connection.

And the electrical connecting pin 7 is connected with the pogo pin9 after the processes of machining, pressing, bending, punching and the like, and then the assembled pogo pin9 and the electrical connecting pin 7 are integrally injection-molded with the shell 6 to form the electrical connecting socket 8.

The positioning column of connector plug 2 inserts in the plug constant head tank of PCB subassembly 5, and the top layer PCB board is connected with pogo pin9 through the gilding finger, carries out circumference laser welding with base 3 and casing 6 again, realizes that the complete machine is sealed and accomplishes.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.