CN113063528B

CN113063528B - Sealing structure of pressure gauge

Info

Publication number: CN113063528B
Application number: CN202110295874.4A
Authority: CN
Inventors: 陈奇盛; 刘圆肖; 陈德龙; 张立祥
Original assignee: Shanghai Meokon Sensing Technology Co ltd
Current assignee: Shanghai Meokon Sensing Technology Co ltd
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2022-09-23
Anticipated expiration: 2041-03-19
Also published as: CN113063528A

Abstract

The invention relates to a sealing structure of a pressure gauge, which comprises an upper cover and a rear cover, wherein the contact surface of the upper cover and the rear cover is provided with an adhesive sealing layer or is fixedly sealed by ultrasonic welding, the joint between the upper cover and the rear cover can be completely sealed by the adhesive sealing layer, or the contact surfaces of the upper cover and the rear cover are welded into a whole by ultrasonic welding, so that the influence of a gap at the joint of the upper cover and the rear cover on the sealing property of the pressure gauge is avoided, the upper cover is provided with a key groove, an opening of the upper cover and a sealing groove arranged around the opening of the upper cover, the upper cover is also provided with a key assembly and a liquid crystal screen, the key assembly comprises a key, a connecting strip and an O-shaped ring, the O-shaped ring is embedded into the sealing groove and extrudes the liquid crystal screen, the O-shaped ring has elasticity, so that the good sealing between the liquid crystal screen and the sealing groove can be realized, the key is embedded into the key groove, the contact surface of the key and the key groove is provided with the adhesive sealing layer or the key and the key groove are subjected to secondary injection molding, the occurrence of a gap can be effectively prevented to thereby affect the sealing property.

Description

Sealing structure of pressure gauge

Technical Field

The invention belongs to the technical field of pressure gauges, and particularly relates to a sealing structure of a pressure gauge.

Background

At present, the most commonly used pressure gauge usually adopts the traditional mechanical pointer type pressure gauge, and the working principle of the mechanical pointer type pressure gauge in the prior art is that a metal pressure-bearing diaphragm deforms to drive a pointer to be converted into a visual pressure value. The mechanical pointer type pressure gauge has the disadvantages that after the mechanical pointer is used for a period of time, the mechanical strength is gradually reduced, and the measurement precision is inaccurate in the later use process. Due to pointer scale display, the visual value error is large at different observation angles. The mechanical pointer type pressure gauge can only display measurement data in one unit. The application scene is relatively single. And the existing pressure gauge has poor sealing performance, and the pressure gauge is controlled to be opened and closed through a key, so that the pressure gauge circuit can not normally work under the accidental conditions of mistaken touch and the like easily.

Disclosure of Invention

1. Technical problems to be solved by the invention

The invention aims to solve the problems that the existing pressure gauge has poor sealing performance, and the pressure gauge is controlled to be opened and closed through a key, so that accidental conditions such as mistaken touch and the like are easy to occur, and a pressure gauge circuit cannot work normally.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the sealing structure of the pressure gauge comprises an upper cover and a rear cover, wherein an adhesive sealing layer is arranged on the contact surface of the upper cover and the rear cover, the upper cover is provided with a key groove, an upper cover opening and a sealing groove arranged around the upper cover opening, the upper cover is also provided with a key assembly and a liquid crystal screen, the key assembly comprises a key, a connecting strip and an O-shaped ring, the O-shaped ring is embedded into the sealing groove and is in contact sealing with the liquid crystal screen, the key is embedded into the key groove, and the adhesive sealing layer is arranged on the contact surface of the key and the key groove.

Preferably, the rear cover comprises a hollow joint and a fixing groove, a containing cavity for containing the core body is arranged in the fixing groove, and the fixing groove is further provided with a chip pressing plate for fixing the core body.

Preferably, the opening that connects with the back lid sets up in holding the chamber bottom, and is equipped with core O shape circle between core and the chamber bottom of holding, the opening that connects with the back lid is connected corresponds the setting with the opening of core O shape circle.

Preferably, the edge of the chip pressing plate extends outwards to form a plurality of bulges, a plurality of grooves are formed between the adjacent bulges, a plurality of fixed screw holes are formed in the fixed grooves, the width of each fixed screw hole is matched with the width of each groove, and the distance between the width of each bulge and the adjacent fixed screw hole is matched to enable the chip pressing plate to be embedded with the fixed grooves.

Preferably, the chip clamp plate is equipped with the cavity, the cavity inner wall outwards extends and contradicts with the core, the chip clamp plate is equipped with a plurality of screw along the cavity all around, and a plurality of screw corresponds the setting with the fixed screw of a plurality of, and a plurality of chip clamp plate screw passes corresponding screw and fixed screw respectively in proper order and fixes.

Preferably, a backlight plate and a circuit board are sequentially arranged on one side, away from the opening of the upper cover, of the liquid crystal screen, a conductive adhesive tape is arranged between the circuit board and the liquid crystal screen, and the circuit board is fixed with the upper cover through a circuit board screw.

Preferably, the core includes pressure sensor, the circuit board includes signal conditioning and enlarged AD converting circuit, microcontroller module and real-time clock module, pressure sensor is connected with signal conditioning and enlarged AD converting circuit electricity, signal conditioning and enlarged AD converting circuit, real-time clock module are connected with microcontroller module electricity respectively, microcontroller module electricity is connected with the demonstration and button module, show and button module are LCD screen and button.

Preferably, the conductive adhesive tape is arranged in a groove on the side surface of the liquid crystal display, a battery groove is formed in the circuit board, and a battery is arranged in the battery groove.

Preferably, the circuit board is provided with a leakage protection circuit, the leakage protection circuit includes a main power interface PW1 and a secondary power interface PW2, the main power interface PW1 is connected to the secondary power interface PW2, and the leakage protection circuit further includes:

the switch S2 and the resistor R1 are electrically connected with the main power interface PW1 through leads and are connected in parallel;

a MOS tube Q1 connected to the main power interface PW 1;

the load unit is connected with the auxiliary power interface PW 2;

one end of the energy storage unit is connected to the MOS tube Q1, and the other end of the energy storage unit is connected with the load unit;

the load unit is further connected with an MCU detection pin, and the load unit is connected with a switch S2, a resistor R1 and an MOS transistor Q1 respectively.

Preferably, the load unit mainly includes a diode D1, a diode D2, a triode Q2, a triode Q3, a resistor R3, a resistor R4 and a resistor R11, one end of the resistor R3 is connected with the diode D1 and the diode D2, the other end of the resistor R3 is connected with the resistor R4 and the triode Q3, and the resistor R4 is connected with the triode Q3 and the energy storage unit; the triode Q2 is also connected with a resistor R10, and the MCU detection pin is connected between the triode Q2 and the resistor R10; the diode D2 is connected with an MCU control pin;

the circuit also comprises a resistor R2 and a resistor R9, one end of the resistor R2 is connected with the resistor R1 and the MOS transistor Q1, the other end of the resistor R2 is connected with the load unit, and the resistor R9 is connected between the switch S2 and the load unit;

the energy storage unit mainly comprises a capacitor C1, a capacitor C2, a capacitor C3 and a protection chip U1, wherein the capacitor C1, the capacitor C2, the capacitor C3 and the protection chip U1 are connected in parallel.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

the sealing structure of the pressure gauge comprises the upper cover and the rear cover, wherein the contact surface of the upper cover and the rear cover is provided with the adhesive sealing layer, or the upper cover and the rear cover are fixedly sealed through ultrasonic welding, the joint between the upper cover and the rear cover can be completely sealed through the adhesive sealing layer, so that the contact surfaces of the upper cover and the rear cover are welded into a whole through ultrasonic welding, and the sealing performance of the pressure gauge is prevented from being influenced by the gap at the joint of the upper cover and the rear cover. The upper cover is equipped with according to the keyway, the upper cover opening and the seal groove that sets up around the upper cover opening, the upper cover still is equipped with key subassembly and LCD screen, key subassembly includes the button, connecting strip and O shape circle, O shape circle embedding seal inslot and with the LCD screen contact seal, O shape circle embedding seal groove extrudees the LCD screen, because O shape circle itself has elasticity, consequently can well seal between LCD screen and the seal groove, and the button embedding presses in the keyway, the button is equipped with the gluing sealing layer or button and button groove secondary injection moulding with button groove contact surface, thereby can prevent effectively that button and button groove contact department from appearing the clearance and influencing the leakproofness.

Drawings

FIG. 1 is a schematic structural view of a sealing structure of a pressure gauge according to the present invention;

FIG. 2 is a schematic structural diagram of a functional module of a sealing structure of a pressure gauge according to the present invention;

fig. 3 is a schematic structural diagram of a circuit board circuit of the present invention.

The reference numerals in the schematic drawings illustrate:

11. an upper cover; 111. a sealing groove; 112. an upper cover is opened; 113. pressing a key slot; 12. a key assembly; 121. pressing a key; 122. a connecting strip; 123. an O-shaped ring; 13. a liquid crystal screen; 14. a conductive adhesive tape; 15. a backlight plate; 16. a circuit board; 17. a battery; 18. a circuit board screw; 19. a chip platen screw; 20. pressing a chip plate; 201. a protrusion; 202. a groove; 203. a cavity; 204. a screw hole; 21. a core body; 22. a core O-ring; 23. a rear cover; 231. a joint; 232. a fixing groove; 233. fixing screw holes; 234. a receiving cavity.

Detailed Description

In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in many different forms and are not limited to the embodiments described herein, but rather are provided for the purpose of providing a more thorough disclosure of the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present; the terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

Referring to fig. 1-3, the sealing structure of a pressure gauge of this embodiment includes upper cover 11 and back cover 23, the upper cover 11 is equipped with the gluing sealing layer with back cover 23 contact surface, perhaps upper cover 11 and back cover 23 are fixed sealed through ultrasonic welding, can make the junction between upper cover 11 and the back cover 23 sealed completely through the gluing sealing layer, make or the contact surface of ultrasonic welding upper cover 11 and back cover 23 fuses as an organic whole, thereby avoid upper cover 11 and back cover 23 junction to have the gap to influence the leakproofness of pressure gauge. Upper cover 11 is equipped with according to keyway 113, upper cover opening 112 and centers on the seal groove 111 that upper cover opening 112 set up, upper cover 11 still is equipped with button subassembly 12 and LCD screen 13, button subassembly 12 includes button 121, connecting strip 122 and O shape circle 123, O shape circle 123 imbeds in the seal groove 111 and with LCD screen 13 contact seal, O shape circle 123 imbeds seal groove 111 and extrudes LCD screen 13, because O shape circle 123 itself has elasticity, consequently can be to carrying out good sealing between LCD screen 13 and the seal groove 111, and in button 121 imbeds according to keyway 113, button 121 is equipped with the gluing sealing layer with button groove 113 contact surface or button 121 and button groove 113 secondary injection moulding, thereby can effectively prevent that the clearance from appearing in button 121 and the button groove 113 contact department and influence the leakproofness.

The rear cover 23 of this embodiment includes hollow joint 231 and fixed slot 232, be equipped with the chamber 234 that holds that is used for holding core 21 in the fixed slot 232, the fixed slot 232 still is equipped with and is used for fixing the chip pressing plate 20 of core 21, the outside extension in edge of chip pressing plate 20 is formed with the protruding 201 of a plurality of, a plurality of form recess 202 between protruding 201 is adjacent, fixed screw 233 of a plurality of is equipped with in the fixed slot 232 inside, the width of fixed screw 233 and the width looks adaptation of recess 202, the width of protruding 201 and the distance looks adaptation of the fixed screw 233 that is adjacent make chip pressing plate 20 and fixed slot 232 gomphosis. When the chip pressing plate 20 is inserted into the fixing groove 232, the fixing screw holes 233 are snapped into the grooves 202, so that the chip pressing plate 20 is fixed to the fixing groove 232 more firmly.

The chip pressing plate 20 is provided with a cavity 203, the inner wall of the cavity 203 extends outwards and is abutted against the core body 21, the chip pressing plate 20 is provided with a plurality of screw holes 204 along the periphery of the cavity 203, the plurality of screw holes 204 are correspondingly arranged with a plurality of fixed screw holes 233, and a plurality of chip pressing plate screws 19 respectively penetrate through the corresponding screw holes 204 and the fixed screw holes 233 in sequence to be fixed.

The opening of the joint 231 connected with the rear cover 23 is arranged at the bottom of the accommodating cavity 234, the core body O-shaped ring 22 is arranged between the core body 21 and the bottom of the accommodating cavity 234, and the opening of the joint 231 connected with the rear cover 23 is arranged corresponding to the opening of the core body O-shaped ring 22.

A backlight plate 15 and a circuit board 16 are sequentially arranged on one side, away from the upper cover opening 112, of the liquid crystal screen 13, a conductive adhesive tape 14 is arranged between the circuit board 16 and the liquid crystal screen 13, and the circuit board 16 is fixed with the upper cover 11 through a circuit board screw 18.

The core 21 includes pressure sensor, circuit board 16 includes signal conditioning and amplifier AD converting circuit, microcontroller module and real-time clock module, pressure sensor is connected with signal conditioning and amplifier AD converting circuit electricity, signal conditioning and amplifier AD converting circuit, real-time clock module are connected with microcontroller module electricity respectively, microcontroller module electricity is connected with the demonstration and button module, show and button module are LCD 13 and button 121. The real-time clock module is used for converting data into corresponding signals and transmitting the signals to the liquid crystal screen 13 for pointer type scale display, so that operators can watch the signals conveniently. The pressure sensor converts pressure into an electric signal, an ADC conversion module on the circuit board 16 conditions and amplifies an output signal of the sensor, the microcontroller realizes pressure acquisition, calculation, calibration, storage, communication and low power consumption management of a system, the battery module provides required electric quantity for the whole system, and the liquid crystal screen 13 displays an acquired pressure value and sensed time point data; the key 121 can realize the function switching of the pressure gauge and the switching among different units.

The conductive adhesive tape 14 is arranged in a groove on the side surface of the liquid crystal screen 13, and a battery groove is arranged in the circuit board 16 and a battery 17 is arranged in the battery groove.

The circuit board 16 is provided with a leakage protection circuit, the leakage protection circuit includes a main power interface PW1 and an auxiliary power interface PW2, the main power interface PW1 is connected to the auxiliary power interface PW2, and the leakage protection circuit further includes:

the MOS tube Q1 is connected to the main power interface PW 1;

the load unit is connected with the auxiliary power interface PW 2;

the load unit is further connected with an MCU detection pin 31, and the load unit is respectively connected with a switch S2, a resistor R1 and an MOS transistor Q1.

The load unit mainly comprises a diode D1, a diode D2, a triode Q2, a triode Q3, a resistor R3, a resistor R4 and a resistor R11, one end of the resistor R3 is connected with the diode D1 and the diode D2, the other end of the resistor R3 is connected with the resistor R4 and the triode Q3, and the resistor R4 is connected with the triode Q3 and the energy storage unit; the triode Q2 is also connected with a resistor R10, and the MCU detection pin 31 is connected between the triode Q2 and the resistor R10; the diode D2 is connected with an MCU control pin 32;

the power supply further comprises a resistor R2 and a resistor R9, one end of the resistor R2 is connected with the resistor R1 and the MOS transistor Q1, the other end of the resistor R2 is connected with the load unit, and the resistor R9 is connected between the switch S2 and the load unit;

When the switch S2 is pressed, the current passes through the two resistors R9 and R11, the triode Q2 is opened, the level of the MCU detection pin 1 is suddenly changed into high level, the action of false triggering is shielded through a software algorithm, after the high leveling lasts for a certain time, the MCU is driven to normally work, when the voltage at the two ends of the load is increased, the power supply of the external power supply is cut off through the switching action of the MOS tube Q1, the capacitor C1 releases the energy charged just, the capacitor C1 is changed into a power supply, the power supply is continuously supplied to the load, the voltage at the two ends of the load is gradually reduced along with the continuous consumption of the energy stored on the capacitor C1, the external power supply needs to be charged again through the switching action of the MOS tube Q1, thus the charging and discharging processes are cyclically stopped from time to time, a stable voltage is always formed, the voltage at the two ends of the load cannot be increased or reduced, the light touch key is adopted in the invention, the circuit protection device has the advantages of being simple and reliable in structure, capable of effectively reducing the damage rate of products when the products are in the running state, improving the use comfort level and the customer satisfaction degree of the products, saving the material consumption of the products, adopting modular design, simple in structure and capable of effectively protecting the normal work of the circuit when the circuit works abnormally.

The above embodiments only express a certain implementation manner of the present invention, and the description is specific and detailed, but not to be understood as limiting the scope of the present invention; it should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which shall fall within the protective scope of the invention; therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A seal structure of manometer which characterized in that: the liquid crystal display panel comprises an upper cover (11) and a rear cover (23), wherein an adhesive sealing layer is arranged on the contact surface of the upper cover (11) and the rear cover (23), the upper cover (11) is provided with a key groove (113), an upper cover opening (112) and a sealing groove (111) surrounding the upper cover opening (112), the upper cover (11) is further provided with a key assembly (12) and a liquid crystal screen (13), the key assembly (12) comprises a key (121), a connecting strip (122) and an O-shaped ring (123), the O-shaped ring (123) is embedded into the sealing groove (111) and is in contact sealing with the liquid crystal screen (13), the key (121) is embedded into the key groove (113), and the key (121) and the contact surface of the key groove (113) are provided with an adhesive sealing layer;

the rear cover (23) comprises a hollow joint (231) and a fixing groove (232), an accommodating cavity (234) for accommodating the core body (21) is arranged in the fixing groove (232), and a chip pressing plate (20) for fixing the core body (21) is further arranged on the fixing groove (232);

a backlight plate (15) and a circuit board (16) are sequentially arranged on one side, away from the upper cover opening (112), of the liquid crystal screen (13), a conductive adhesive tape (14) is arranged between the circuit board (16) and the liquid crystal screen (13), and the circuit board (16) is fixed with the upper cover (11) through a circuit board screw (18);

an opening of the joint (231) connected with the rear cover (23) is formed in the bottom of the accommodating cavity (234), a core body O-shaped ring (22) is arranged between the core body (21) and the bottom of the accommodating cavity (234), and an opening of the joint (231) connected with the rear cover (23) is formed corresponding to the opening of the core body O-shaped ring (22);

the edge of the chip pressing plate (20) extends outwards to form a plurality of protrusions (201), grooves (202) are formed between the adjacent protrusions (201), a plurality of fixing screw holes (233) are formed in the fixing grooves (232), the width of each fixing screw hole (233) is matched with the width of each groove (202), and the width of each protrusion (201) is matched with the distance between the adjacent fixing screw holes (233) so that the chip pressing plate (20) is embedded with the fixing grooves (232);

chip clamp plate (20) are equipped with cavity (203), cavity (203) inner wall outwards extends and contradicts with core (21), chip clamp plate (20) are equipped with a plurality of screw (204) all around along cavity (203), and a plurality of screw (204) correspond the setting with the fixed screw (233) of a plurality of, and a plurality of chip clamp plate screw (19) pass corresponding screw (204) respectively in proper order and fix with fixed screw (233).

2. A sealing structure of a pressure gauge according to claim 1, wherein: core (21) include pressure sensor, circuit board (16) are including signal conditioning and enlarged AD converting circuit, microcontroller module and real-time clock module, pressure sensor is connected with signal conditioning and enlarged AD converting circuit electricity, signal conditioning and enlarged AD converting circuit, real-time clock module are connected with microcontroller module electricity respectively, microcontroller module electricity is connected with demonstration and button module, demonstration and button module are LCD screen (13) and button (121).

3. A sealing structure of a pressure gauge according to claim 1, wherein: the conductive adhesive tape (14) is arranged in a groove on the side surface of the liquid crystal screen (13), a battery groove is formed in the circuit board (16), and a battery (17) is arranged in the battery groove.

4. A sealing structure of a pressure gauge according to claim 2, wherein: the circuit board (16) is provided with a leakage protection circuit, the leakage protection circuit comprises a main power interface PW1 and an auxiliary power interface PW2, the main power interface PW1 is connected with the auxiliary power interface PW2, and the leakage protection circuit further comprises:

the MOS tube Q1 is connected to the main power interface PW 1;

the load unit is connected with the auxiliary power interface PW 2;

the load unit is further connected with an MCU detection pin (31), and the load unit is connected with a switch S2, a resistor R1 and an MOS transistor Q1 respectively.

5. The sealing structure of a pressure gauge according to claim 4, wherein: the load unit mainly comprises a diode D1, a diode D2, a triode Q2, a triode Q3, a resistor R3, a resistor R4 and a resistor R11, one end of the resistor R3 is connected with the diode D1 and the diode D2, the other end of the resistor R3 is connected with the resistor R4 and the triode Q3, and the resistor R4 is connected with the triode Q3 and the energy storage unit; the triode Q2 is also connected with a resistor R10, and the MCU detection pin (31) is connected between the triode Q2 and the resistor R10; the diode D2 is connected with an MCU control pin (32);