CN217845474U - High-stability waterproof pressure sensor - Google Patents

Abstract

The application discloses a high-stability waterproof pressure sensor, which belongs to the field of vehicle sensors and is used for a sensor and comprises a plug and a copper sleeve, wherein the copper sleeve is provided with a copper sleeve threaded end, the copper sleeve threaded end is provided with a detection port, the plug is provided with a terminal, the copper sleeve is provided with a ceramic sensor, the ceramic sensor seals the outlet of the detection port, the ceramic sensor is connected with a PCB (printed circuit board) through an electric signal, and the PCB is connected with the terminal through a terminal connecting wire; the bottom end of the plug is inserted into the copper sleeve and is contacted with the ceramic sensor, an anti-rotation limiting bulge is processed at the bottom end of the plug, and the anti-rotation limiting bulge is matched with an anti-rotation limiting groove in the copper sleeve; the outer surface of the plug is also provided with a riveting caulking groove which is positioned at the position of the riveting part at the top end of the copper sleeve. This application can also accurately react the size of retarding moment when guaranteeing the leakproofness through the measurement of built-in ceramic sensor realization to compressed air pressure size to supply on-vehicle system to judge the vehicle state.

Description

High-stability waterproof pressure sensor

Technical Field

The utility model belongs to the vehicle sensor field, specifically speaking especially relates to a waterproof type pressure sensor of high stability.

Background

The current automobile retarder sold on the market comprises two structures, one is an electric eddy current retarder and the other is a liquid turbine (hydraulic) retarder. Taking a hydraulic turbine retarder as an example, the hydraulic turbine retarder mainly reduces the running speed of a vehicle through a hydraulic device. When the hydraulic turbine retarder works, the electronic control system controls the proportional valve to charge oil into the working cavity, and the pressure and the quantity of the oil in the working cavity, the rotating speed of the transmission shaft and the like determine the retarding torque. During working, oil in the oil groove is pressed into the working cavity by compressed air controlled by a proportional valve, the oil amount supplied to the working cavity is different due to different pressures of the compressed air, and therefore the generated retarding torque is different. In the working process, the judgment of the magnitude of the retarding torque can be realized by detecting the pressure of the compressed air, and the detected pressure value is converted into an analog signal or a digital signal which can be judged by a vehicle-mounted system. For example, chinese patent publication No. CN208721302U discloses a fast response film pressure sensor with a buffer, which requires pressing an elastic body pressing member into a first concave cavity, embedding a locking ring into a second concave cavity of the pressing member, and completing the tight assembly of an elastic component and the pressing member; when fluid pressure acts on the elastic diaphragm, a measuring circuit on the elastic diaphragm outputs an electric signal proportional to the pressure.

In the above-mentioned publication, it is necessary to provide a buffer in the pressure guiding hole to achieve the corresponding speed improvement of the pressure sensor, and then in the above-mentioned publication, a good sealing environment is not provided between the housing and the pressure receiving member, which is easily interfered by the outside and has poor connection stability; thirdly, the shell is not provided with an effective ventilation structure, and the exchange of internal gas and external gas is realized while the invasion of external water vapor is stopped.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a waterproof type pressure sensor of high stability, it can realize the measurement to compressed air pressure size through built-in ceramic sensor, also can accurately react the size of retarding moment when guaranteeing the leakproofness to supply on-vehicle system to judge vehicle state.

In order to achieve the purpose, the utility model is realized by the following technical proposal:

a high-stability waterproof pressure sensor comprises a plug and a copper sleeve which are connected into a whole, wherein a copper sleeve threaded end is arranged at the bottom end of the copper sleeve, a detection port communicated with the inside of the copper sleeve is formed in the copper sleeve threaded end, a terminal is arranged inside the plug, a ceramic sensor is arranged inside the copper sleeve at the outlet of the detection port, the ceramic sensor seals the outlet of the detection port, the ceramic sensor is connected with a PCB (printed circuit board) through an electric signal, and the PCB is connected with the terminal through a terminal connecting wire; the bottom end of the plug is inserted into the copper sleeve and is contacted with the ceramic sensor, an anti-rotation limiting bulge is processed at the bottom end of the plug, and the anti-rotation limiting bulge is matched with an anti-rotation limiting groove in the copper sleeve; the outer surface of the plug is also provided with a riveting caulking groove which is positioned at the position of the riveting part at the top end of the copper sleeve.

Furthermore, the bottom end of the ceramic sensor and the outlet position of the detection port in the copper sleeve are provided with an O-shaped ring C.

Further say, the surface of plug in this application be provided with the sealing washer caulking groove, be provided with O type circle B in the sealing washer caulking groove, O type circle B and the inside wall crimping of copper sheathing after the plug inserts to the copper sheathing.

Further, the copper sheathing described in this application is provided with an O-ring a at the threaded end of the copper sheathing.

Further, the inside of the plug described in the present application has a vent hole communicating with the inside of the copper bush, the vent hole being provided with a semipermeable membrane at an outlet position located inside the copper bush.

Further say, in this application PCB board have ground connection and bleed the terminal, ground connection is bled terminal and copper sheathing intercommunication, the bottom of plug is equipped with and leaks the terminal complex of terminal and bleed the terminal draw-in groove with ground connection.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a multiple sealing washer seal structure keeps apart electrical structure and exterior structure completely, has avoided the contact of circuit components and parts with outside liquid, avoids liquid to disturb.

2. The utility model discloses ceramic sensor among the electrical structure can also change the pressure that receives into the electric capacity change, changes electric capacity change signal conversion into analog signal or digital signal through the PCB board, and then realizes the pressure measurement to compressed air, also can react out the size of retarding moment through this measured numerical value.

3. The utility model discloses a set up on the plug and place the bleeder vent of the cavity intercommunication of electrical structure to cover the pellicle in bleeder vent department, can effectively guarantee gaseous and external exchange in the cavity, avoid the cavity and outside pressure differential because of temperature variation causes, avoid outside steam etc. to enter into inside the cavity simultaneously.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is a schematic structural diagram of the middle copper sleeve of the present invention.

Fig. 4 is a schematic structural diagram of the plug of the present invention.

Fig. 5 is a schematic structural diagram of the middle PCB board of the present invention.

Fig. 6 is a schematic circuit diagram of the PCB of the present invention.

In the figure: 1. a plug; 2. a copper sleeve; 3. o-shaped ring A; 4. a copper sleeve threaded end; 5. a terminal; 6. air holes are formed; 7. a semi-permeable membrane; 8. a terminal connection line; 9. an O-shaped ring B; 10. a PCB board; 11. a ceramic sensor; 12. o-shaped ring C; 13. a detection port; 14. riveting parts; 15. an anti-rotation limiting groove; 16. an anti-rotation limiting bulge; 17. a sealing ring is embedded in the groove; 18. riveting the caulking groove; 19. a clamping groove of the tapping wire end; 20. and a ground bleeder end.

Detailed Description

The technical solution of the present invention will be further described and explained with reference to the accompanying drawings. The terms of orientation used in the detailed description are merely provided to facilitate a person skilled in the art to understand the technical solutions described in the present application according to the visual orientations shown in the drawings. Unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and their specific meanings in the present disclosure may be understood by those skilled in the art as appropriate.

The utility model provides a waterproof type pressure sensor of high stability, its includes copper sheathing 2, and the bottom of copper sheathing 2 has rather than integrative and processes copper sheathing thread end 4 that has the external screw thread, and copper sheathing link 4 has the detection mouth 13 with the 2 inner space intercommunications of copper sheathing, detects mouth 13 and is the through-hole structure. The plug 1 is inserted into the copper sleeve 2, and a cavity for accommodating the PCB 10 and the ceramic sensor 11 is formed by the plug 1. When the device is used, the copper bush threaded section 4 is screwed into the threaded hole at the measuring position, and the sealing at the connecting position is realized through the O-shaped ring A3 at the position of the copper bush threaded section 4.

The ceramic sensor 11 is placed on the copper sleeve 2 at the outlet position of the detection port 13, and an O-shaped ring C12 is arranged at the connecting position of the ceramic sensor 11 and the copper sleeve 2. The ceramic sensor 11 has a contact electrically connected with the PCB 10, the PCB 10 is a flexible circuit board, two sides of the flexible circuit board are provided with ground leakage line terminals 20, and the ground leakage line terminals 20 can release static electricity inside the circuit to a copper sleeve and a vehicle body connected with the ground leakage line terminals, so that the stability of signals output by the PCB 10 is ensured, and signal fluctuation is avoided. The pressure sensor utilizes the ceramic sensor capacitor to be under the action of pressure, the diaphragm can be bent and deformed, the capacitance changes along with the deformation of the diaphragm, the pressure and the capacitance change in a proportional relation, and the change of the pressure can be known by detecting the change of the capacitance. The ceramic sensor 11 is a ceramic capacitance pressure sensor, has excellent characteristics of corrosion resistance, impact resistance and high elasticity, can be in direct contact with most media, and has extremely high thermal stability, so that the working range can reach-40 ℃ to 150 ℃.

The PCB board 10 has a circuit interface connected to the ceramic sensor 11, and a capacitance-voltage conversion chip connected to the circuit interface, and the capacitance-voltage conversion chip sequentially sends processed voltage signals to the filter capacitor and the anti-surge circuit and outputs the voltage signals through an external voltage output interface. That is, the PCB board 10 functions to convert the capacitance signal of the ceramic sensor 11 into a voltage signal and feed it into the in-vehicle system through the terminal.

The plug 1 and the internal terminal 5 are integrally molded by injection, and the bottom end of the terminal 5 extends out of the plug 1 and is connected with a pin of the PCB 10 through a terminal connecting wire 8 so as to transmit a signal of the PCB 10 to an on-board system.

The bottom processing of plug 1 has the spacing arch 16 of preventing changeing, prevents changeing the spacing arch 16 and the inside stop groove 15 joint cooperation of preventing changeing of corresponding position department of copper sheathing 2, avoids the rotation between plug 1 and the copper sheathing 2, still processes simultaneously at the adjacent plug bottom of preventing changeing between the spacing arch 16 and is used for dodging the terminal draw-in groove 19 that leaks of ground connection terminal 20, and the terminal draw-in groove 19 that leaks can guarantee the stability of PCB board 10 again when fixed ground connection terminal 20 that leaks.

The utility model discloses in plug 1 and copper sheathing 2 adopt be that riveting locking technology is fixed, form the riveting portion 14 of inside fore shaft at the top end opening part of copper sheathing 2 promptly, form at the surface of plug 1 with this riveting portion 14 complex riveting caulking groove 18. Through the matching of the riveting part 14 and the riveting caulking groove 18 and the matching of the anti-rotation limiting bulge 16 and the anti-rotation limiting clamping groove 15 recorded in the above paragraphs, the relative movement between the plug 1 and the copper sleeve 2 can be avoided in the axial direction and the circumferential direction, and the connection stability of the plug and the copper sleeve can be ensured.

The utility model discloses in plug 1 in the inside in the space that 5 enclose of terminal seted up bleeder vent 6, bleeder vent 6 is the shoulder hole, its and the cavity intercommunication of placing PCB board 10 to exit position department that is close to PCB board 10 at bleeder vent 6 is provided with pellicle 7. The effect of pellicle 7 lies in ventilative waterproof, avoids the pressure differential that the cavity that plug 1 and copper sheathing 2 formed caused because of temperature variation, also can effectively avoid steam etc. to enter into the cavity of placing PCB board 10 simultaneously.

Simultaneously, for the cavity seal nature of guaranteeing to place PCB board 10, the utility model discloses still realize through supplementary O type circle B9, O type circle C12 that sets up. The O-shaped ring C12 is positioned between the ceramic sensor 11 and the copper sleeve 2 at the outlet position of the detection port 13 and is used for ensuring the tightness of the connection position of the ceramic sensor 11 and the copper sleeve 2; the O-shaped ring B9 is positioned at the connecting position of the plug 1 and the copper sleeve 2, the plug 1 is provided with a sealing ring caulking groove 17 for placing the O-shaped ring B9, and the O-shaped ring B9 can seal the contact surface of the plug 1 and the copper sleeve. Secondly, the utility model discloses in still be provided with O type circle A3 in the position department of copper sheathing thread end 4, O type circle A3 can realize the pressure seal of hookup location department, prevents the pressure release.

Finally, although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description of the present description is for clarity reasons only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims (6)

1. The utility model provides a waterproof type pressure sensor of high stability, is including connecting plug (1), copper sheathing (2) as an organic whole, the bottom of copper sheathing (2) has copper sheathing screw thread end (4), and copper sheathing screw thread end (4) have with inside detection mouth (13) that link up of copper sheathing (2), the inside of plug (1) is provided with terminal (5), its characterized in that: a ceramic sensor (11) is arranged at an outlet of a detection port (13) in the copper sleeve (2), the ceramic sensor (11) seals the outlet of the detection port (13), the ceramic sensor (11) is connected with a PCB (10) through an electric signal, and the PCB (10) is connected with a terminal (5) through a terminal connecting wire (8); the bottom end of the plug (1) is inserted into the copper sleeve (2) and is in contact with the ceramic sensor (11), an anti-rotation limiting bulge (16) is processed at the bottom end of the plug (1), and the anti-rotation limiting bulge (16) is matched with an anti-rotation limiting groove (15) in the copper sleeve (2); the outer surface of the plug (1) is also provided with a riveting caulking groove (18), and the riveting caulking groove (18) is positioned at the position of a riveting part (14) at the top end of the copper sleeve (2).

2. A high stability waterproof type pressure sensor according to claim 1, wherein: and an O-shaped ring C (12) is arranged at the outlet position of the bottom end of the ceramic sensor (11) and the detection port (13) in the copper sleeve (2).

3. A high-stability waterproof type pressure sensor according to claim 2, wherein: the outer surface of plug (1) is provided with sealing washer caulking groove (17), be provided with O type circle B (9) in sealing washer caulking groove (17), insert to the inside wall crimping of copper sheathing (2) back O type circle B (9) and copper sheathing (2) at plug (1).

4. A high stability waterproof type pressure sensor according to claim 3, wherein: the copper sleeve (2) is provided with an O-shaped ring A (3) at the threaded end (4) of the copper sleeve.

5. The high-stability waterproof type pressure sensor according to any one of claims 1 to 4, wherein: the inside of plug (1) has bleeder vent (6) with inside intercommunication of copper sheathing (2), bleeder vent (6) are provided with pellicle (7) at the exit position department that lies in copper sheathing (2).

6. The high-stability waterproof type pressure sensor according to any one of claims 1 to 4, wherein: the PCB (10) is provided with a grounding leakage wire end (20), the grounding leakage wire end (20) is communicated with the copper sleeve (2), and the bottom end of the plug (1) is provided with a leakage wire end clamping groove (19) matched with the grounding leakage wire end (20).

Images