CN113063528B - A sealing structure of a pressure gauge - Google Patents

Abstract

The sealing structure of a pressure gauge of the present invention includes an upper cover and a back cover. The contact surfaces of the upper cover and the back cover are provided with an adhesive sealing layer or fixed and sealed by ultrasonic welding. The adhesive sealing layer can make the upper cover and the back cover The connection between the covers is completely sealed, or the contact surfaces of the upper cover and the back cover are integrated by ultrasonic welding, so as to avoid the gap between the upper cover and the back cover, which will affect the sealing performance of the pressure gauge. The upper cover is provided with key grooves, The opening of the upper cover and the sealing groove arranged around the opening of the upper cover, and the upper cover is also provided with a button assembly and a liquid crystal screen. Because the O-ring itself is elastic, it can seal the LCD screen and the sealing groove well, and the key is embedded in the key groove, and the contact surface between the key and the key groove is provided with an adhesive sealing layer, or the key and the key groove are overmolded. , which can effectively prevent the occurrence of gaps and affect the sealing performance.

Description

A sealing structure of a pressure gauge

technical field

The invention belongs to the technical field of pressure gauges, in particular to a sealing structure of a pressure gauge.

Background technique

At present, the most commonly used pressure gauge is usually the traditional mechanical pointer pressure gauge. The working principle of the mechanical pointer pressure gauge in the prior art is that the metal pressure diaphragm is deformed, and the pointer is converted into a visual pressure value. The disadvantage of the mechanical pointer pressure gauge is that the mechanical strength of the mechanical pointer will gradually decrease after a period of use, resulting in inaccurate measurement accuracy in the later use process. Due to the pointer scale display, the apparent value error is large at different observation angles. The mechanical pointer pressure gauge can only display measurement data in one unit. The application scenario is relatively simple. In addition, the existing pressure gauge has poor sealing performance, and the opening and closing of the pressure gauge is controlled by buttons, which is prone to accidental situations such as accidental touch, which makes the pressure gauge circuit unable to work normally.

SUMMARY OF THE INVENTION

1. The technical problem to be solved by the invention

The purpose of the present invention is to solve the problem that the existing pressure gauge has poor sealing, and the opening and closing of the pressure gauge is controlled by buttons, and accidental situations such as accidental touch are easy to occur, which makes the pressure gauge circuit unable to work normally.

2. Technical solutions

In order to achieve the above object, the technical scheme provided by the invention is:

The sealing structure of a pressure gauge of the present invention includes an upper cover and a rear cover, the contact surfaces of the upper cover and the rear cover are provided with an adhesive sealing layer, and the upper cover is provided with a key groove, an upper cover opening and a surrounding A sealing groove provided at the opening of the upper cover, the upper cover is also provided with a key assembly and a liquid crystal screen, the key assembly includes a key, a connecting strip and an O-ring, the O-ring is embedded in the sealing groove and is in contact with the liquid crystal screen to seal , the key is embedded in the key groove, and the contact surface between the key and the key groove is provided with an adhesive sealing layer.

Preferably, the rear cover includes a hollow joint and a fixing groove, the fixing groove is provided with a accommodating cavity for accommodating the core body, and the fixing groove is further provided with a chip pressing plate for fixing the core body.

Preferably, the opening connecting the joint and the back cover is provided at the bottom of the accommodating cavity, and a core O-ring is arranged between the core and the bottom of the accommodating cavity, and the opening connecting the joint and the back cover is connected to the core O-ring The opening corresponding to the setting.

Preferably, the edge of the chip pressing plate extends outward to form a plurality of protrusions, a groove is formed between a plurality of the protrusions adjacent to each other, and a plurality of fixing screw holes are arranged inside the fixing groove, and the fixing screw The width of the hole is adapted to the width of the groove, and the width of the protrusion is adapted to the distance between the adjacent fixing screw holes, so that the chip pressing plate fits into the fixing groove.

Preferably, the chip pressing plate is provided with a cavity, the inner wall of the cavity extends outward and is in contact with the core body, the chip pressing plate is provided with several screw holes along the circumference of the cavity, and several screw holes are fixed with several screw holes. The screw holes are correspondingly arranged, and a plurality of chip pressing plate screws pass through the corresponding screw holes and the fixing screw holes in turn for fixing.

Preferably, a backlight plate and a circuit board are arranged on the side of the liquid crystal screen away from the opening of the upper cover in sequence, a conductive rubber strip is arranged between the circuit board and the liquid crystal screen, and the circuit board is connected to the upper cover through circuit board screws. Cover is fixed.

Preferably, the core body includes a pressure sensor, the circuit board includes a signal conditioning and amplification/AD conversion circuit, a microcontroller module and a real-time clock module, the pressure sensor is electrically connected with the signal conditioning and amplification/AD conversion circuit, The signal conditioning and amplification/AD conversion circuit and the real-time clock module are respectively electrically connected with the microcontroller module, and the microcontroller module is electrically connected with a display and key module, which is a liquid crystal screen and keys.

Preferably, the conductive rubber strip is arranged in a groove on the side of the liquid crystal screen, a battery groove is provided in the circuit board, and a battery is provided in the battery groove.

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

The switch S2 and the resistor R1 are electrically connected to the main power interface PW1 through wires, and are connected in parallel with each other;

MOS tube Q1, connected to the main power interface PW1;

The load unit is connected to the auxiliary power interface PW2;

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

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

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

Also includes resistor R2 and resistor R9, one end of the resistor R2 is connected with the resistor R1 and the MOS tube Q1, the other end 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 includes a capacitor C1, a capacitor C2, a capacitor C3 and a protection chip U1, and the capacitor C1, the capacitor C2, the capacitor C3 and the protection chip U1 are connected in parallel with each other.

3. Beneficial effects

Adopting the technical scheme provided by the present invention, compared with the prior art, has the following beneficial effects:

The sealing structure of a pressure gauge of the present invention includes an upper cover and a back cover, the contact surfaces of the upper cover and the back cover are provided with an adhesive sealing layer, or the upper cover and the back cover are fixed and sealed by ultrasonic welding, and the adhesive sealing layer The joint between the upper cover and the rear cover can be completely sealed, so that the contact surfaces of the upper cover and the rear cover can be integrated by ultrasonic welding, so as to prevent the gap between the upper cover and the rear cover from affecting the tightness of the pressure gauge. 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 an LCD screen. The key assembly includes a key, a connecting strip and an O-ring, and the O-ring is embedded in the sealing groove. And contact and seal with the LCD screen, the O-ring is embedded in the sealing groove and squeezes the LCD screen. Because the O-ring itself is elastic, it can seal the LCD screen and the sealing groove well, and the key is embedded in the key groove. The contact surface between the button and the button groove is provided with an adhesive sealing layer or the button and the button groove are over-injected, which can effectively prevent the gap between the button and the button groove from affecting the sealing performance.

Description of drawings

Fig. 1 is the structural representation of the sealing structure of a kind of pressure gauge of the present invention;

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.

Description of the labels in the diagram:

11, upper cover; 111, sealing groove; 112, upper cover opening; 113, key slot; 12, key assembly; 121, key; 122, connecting strip; 123, O-ring; 13, LCD screen; 14, conductive adhesive bar; 15, backlight board; 16, circuit board; 17, battery; 18, circuit board screw; 19, chip pressure plate screw; 20, chip pressure plate; 201, protrusion; 202, groove; 203, cavity; 204, 21, core body; 22, core body O-ring; 23, rear cover; 231, joint; 232, fixing groove; 233, fixing screw hole; 234, accommodating cavity.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be more fully described below with reference to the related drawings, in which several embodiments of the present invention are given, however, the present invention can be implemented in many different forms and is not limited to this The described embodiments are, rather, provided so that this disclosure will be thorough and complete.

It should be noted that when an element is referred to as being "fixed" 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 may be be directly connected to another element or intervening elements may be present; the terms "vertical", "horizontal", "left", "right" and similar expressions are used herein for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the present invention; the terms used herein in the description of the present invention are only used to describe specific embodiments is not intended to limit 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 Figures 1 to 3, a sealing structure of a pressure gauge in this embodiment includes an upper cover 11 and a rear cover 23, and the contact surfaces of the upper cover 11 and the rear cover 23 are provided with an adhesive sealing layer, or the upper cover 11 and the rear cover 23. The cover 11 and the back cover 23 are fixed and sealed by ultrasonic welding, and the joint between the top cover 11 and the back cover 23 can be completely sealed by the adhesive sealing layer, so that the contact surface of the top cover 11 and the back cover 23 can be welded by ultrasonic welding. In order to prevent the gap between the upper cover 11 and the rear cover 23 from affecting the sealing performance of the pressure gauge. The upper cover 11 is provided with a key slot 113, an upper cover opening 112 and a sealing groove 111 arranged around 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 It includes a button 121, a connecting bar 122 and an O-ring 123. The O-ring 123 is embedded in the sealing groove 111 and is in contact with the LCD screen 13. The O-ring 123 is embedded in the sealing groove 111 and squeezes the LCD screen 13. The O-ring 123 itself has elasticity, so it can seal the liquid crystal screen 13 and the sealing groove 111 well, and the key 121 is embedded in the key groove 113, and the contact surface of the key 121 and the key groove 113 is provided with an adhesive sealing layer or The button 121 and the button groove 113 are formed by secondary injection molding, which can effectively prevent the gap between the button 121 and the button groove 113 from being in contact, thereby affecting the sealing performance.

The rear cover 23 of the present embodiment includes a hollow joint 231 and a fixing groove 232 . The fixing groove 232 is provided with a accommodating cavity 234 for accommodating the core body 21 , and the fixing groove 232 is further provided with a accommodating cavity 234 for fixing the core body 21 . The edge of the chip pressure plate 20 is formed with a plurality of protrusions 201 extending outward, a groove 202 is formed between a plurality of the protrusions 201 adjacent to each other, and a plurality of fixing screw holes are arranged inside the fixing groove 232 233, the width of the fixing screw hole 233 is adapted to the width of the groove 202, and the width of the protrusion 201 is adapted to the distance between the adjacent fixing screw holes 233, so that the chip pressing plate 20 is fitted with the fixing slot 232. . When the chip pressing plate 20 is embedded in the fixing groove 232 , the fixing screw holes 233 are inserted into the groove 202 , so that the chip pressing plate 20 and the fixing groove 232 are more firmly fixed.

The chip pressing plate 20 is provided with a cavity 203 , and the inner wall of the cavity 203 extends outward and is in contact with the core 21 . The chip pressing plate 20 is provided with a number of screw holes 204 along the circumference of the cavity 203 . A plurality of fixing screw holes 233 are provided correspondingly, and a plurality of chip pressing plate screws 19 are respectively passed through the corresponding screw holes 204 and the fixing screw holes 233 for fixing.

The opening connecting the joint 231 to the rear cover 23 is provided at the bottom of the accommodating cavity 234, and the core O-ring 22 is arranged between the core 21 and the bottom of the accommodating cavity 234. The opening connecting the joint 231 to the rear cover 23 is connected to the core The openings of the O-rings 22 are correspondingly arranged.

A backlight plate 15 and a circuit board 16 are arranged on the side of the liquid crystal screen 13 away from the upper cover opening 112 in sequence. A conductive adhesive strip 14 is arranged between the circuit board 16 and the liquid crystal screen 13 , and the circuit board 16 passes through the circuit board. The screws 18 are fixed to the upper cover 11 .

The core 21 includes a pressure sensor, the circuit board 16 includes a signal conditioning and amplification/AD conversion circuit, a microcontroller module and a real-time clock module, and the pressure sensor is electrically connected to the signal conditioning and amplification/AD conversion circuit, so The signal conditioning and amplification/AD conversion circuit and the real-time clock module are respectively electrically connected with the microcontroller module, and the microcontroller module is electrically connected with a display and key module, which is the liquid crystal screen 13 and the key 121 . The real-time clock module is used to convert data into corresponding signals and send them to the liquid crystal screen 13 for pointer scale display, which is convenient for operators to watch. The pressure sensor converts the pressure into an electrical signal, the ADC conversion module on the circuit board 16 adjusts and amplifies the sensor output signal, the microcontroller realizes the pressure collection, calculation, calibration, storage, communication and low power management of the system, and the battery The module provides the required power for the entire system, and the liquid crystal screen 13 displays the collected pressure value and the sensed time point data; the button 121 can realize the function switching of the pressure gauge and switching between different units.

The conductive adhesive strip 14 is disposed in the groove on the side of the liquid crystal screen 13 , the circuit board 16 is provided with a battery groove and the battery groove is provided with a battery 17 .

The circuit board 16 is provided with a leakage protection circuit, and the leakage protection circuit includes a main power supply interface PW1 and a secondary power supply interface PW2, the main power supply interface PW1 is connected with the auxiliary power supply interface PW2, and also includes:

The switch S2 and the resistor R1 are electrically connected to the main power interface PW1 through wires, and are connected in parallel with each other;

MOS tube Q1, connected to the main power interface PW1;

The load unit is connected to the auxiliary power interface PW2;

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

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

The load unit mainly includes a diode D1, a diode D2, a transistor Q2, a transistor Q3, a resistor R3, a resistor R4 and a resistor R11. One end of the resistor R3 is connected to the diode D1 and the diode D2, and the other end is connected to the resistor R4 and the transistor Q3. , the resistor R4 is connected with the transistor Q3 and the energy storage unit; the transistor Q2 is also connected with a resistor R10, the MCU detection pin 31 is connected between the transistor Q2 and the resistor R10; the diode D2 is connected with the MCU control feet 32;

Also includes resistor R2 and resistor R9, one end of the resistor R2 is connected with the resistor R1 and the MOS tube Q1, the other end 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 includes a capacitor C1, a capacitor C2, a capacitor C3 and a protection chip U1, and the capacitor C1, the capacitor C2, the capacitor C3 and the protection chip U1 are connected in parallel with each other.

When the switch S2 is pressed, the current flows through the resistors R9 and R11, and the transistor Q2 is turned on. At this time, the level of the MCU detection pin 1 suddenly changes to a high level, and the false triggering action is shielded by the software algorithm. After the high leveling lasts for a certain period of time, the driving MCU will work normally. When the voltage across the load rises, the external power supply is disconnected through the switching action of the MOS transistor Q1, and the capacitor C1 releases the previously charged energy. At this time, the capacitor C1 It becomes a "power supply" and continues to supply power to the load. With the continuous consumption of the stored energy on the capacitor C1, the voltage across the load begins to gradually decrease, and the external power supply needs to be charged again through the switching action of the MOS transistor Q1, so the cycle is repeated from time to time. The process of charging and discharging is stopped, so as to form a stable voltage, so that the voltage at both ends of the load will not increase or decrease forever. The present invention adopts the light touch button, the structure is simple and reliable, and can be effectively reduced when the product is running. The damage rate of the product is improved, the use comfort of the product and customer satisfaction are improved, the material consumption of the product is saved, the modular design is adopted, and the structure is simple, which can effectively protect the normal operation of the circuit in the face of abnormal operation of the circuit.

The above-mentioned embodiment only expresses a certain embodiment of the present invention, and its description is more specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention; it should be pointed out that for those of ordinary skill in the art Said that, on the premise of not departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention; therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (5)

1. A sealing structure for a pressure gauge, characterized in that it comprises an upper cover (11) and a rear cover (23), and the contact surfaces of the upper cover (11) and the rear cover (23) are provided with an adhesive sealing layer, so that the The upper cover (11) is provided with a key slot (113), an upper cover opening (112) and a sealing groove (111) arranged around the upper cover opening (112), and the upper cover (11) is further provided with a key assembly (12) and a liquid crystal screen (13), the key assembly (12) includes a key (121), a connecting strip (122) and an O-ring (123), the O-ring (123) is embedded in the sealing groove (111) inside and in contact with the liquid crystal screen (13) and sealed, the key (121) is embedded in the key groove (113), and the contact surface of the key (121) and the key groove (113) is provided with an adhesive sealing layer; The rear cover (23) includes a hollow joint (231) and a fixing groove (232), and an accommodating cavity (234) for accommodating the core (21) is provided in the fixing groove (232), and the fixing groove (232) 232) is also provided with a chip pressing plate (20) for fixing the core body (21); A backlight plate (15) and a circuit board (16) are arranged on the side of the liquid crystal screen (13) away from the upper cover opening (112) in sequence, and a back light plate (15) and a circuit board (16) are arranged between the circuit board (16) and the liquid crystal screen (13). There is a conductive adhesive strip (14), and the circuit board (16) is fixed to the upper cover (11) by circuit board screws (18); The opening connecting the joint (231) and the back cover (23) is arranged at the bottom of the accommodating cavity (234), and a core O-ring (22) is arranged between the core (21) and the bottom of the accommodating cavity (234), The opening connecting the joint (231) with the rear cover (23) is arranged corresponding to the opening of the core O-ring (22); A plurality of protrusions (201) are formed on the edge of the chip pressing plate (20) extending outward, and a groove (202) is formed between a plurality of the protrusions (201) adjacent to each other, and the interior of the fixing groove (232) is Several fixing screw holes (233) are provided, the width of the fixing screw holes (233) is adapted to the width of the groove (202), and the width of the protrusion (201) is the same as that of the adjacent fixing screw holes (233). The distance of 233) is adapted so that the chip pressing plate (20) is fitted with the fixing groove (232); The chip pressure plate (20) is provided with a cavity (203), the inner wall of the cavity (203) extends outward and is in contact with the core body (21), and the chip pressure plate (20) is along the circumference of the cavity (203). Several screw holes (204) are provided, and several screw holes (204) are correspondingly arranged with several fixing screw holes (233). The screw holes (233) are used for fixing. 2. The sealing structure of a pressure gauge according to claim 1, wherein the core body (21) comprises a pressure sensor, and the circuit board (16) comprises a signal conditioning and amplification/AD conversion circuit, a micro A controller module and a real-time clock module, the pressure sensor is electrically connected with a signal conditioning and amplification/AD conversion circuit, the signal conditioning and amplification/AD conversion circuit, and the real-time clock module are respectively electrically connected with the microcontroller module, the micro The controller module is electrically connected with a display and key module, and the display and key module is a liquid crystal screen (13) and a key (121). 3 . The sealing structure of a pressure gauge according to claim 1 , wherein the conductive rubber strip ( 14 ) is arranged in a groove on the side of the liquid crystal screen ( 13 ), and in the circuit board ( 16 ). 4 . A battery groove is provided and a battery (17) is arranged in the battery groove. 4. The sealing structure of a pressure gauge according to claim 2, wherein the circuit board (16) is provided with a leakage protection circuit, and the leakage protection circuit comprises a main power supply interface PW1 and a secondary power supply interface PW2, The main power interface PW1 is connected to the auxiliary power interface PW2, and further includes: The switch S2 and the resistor R1 are electrically connected to the main power interface PW1 through wires, and are connected in parallel with each other; MOS tube Q1, connected to the main power interface PW1; The load unit is connected to the auxiliary power interface PW2; The energy storage unit, one end is connected to the MOS tube Q1, and the other end is connected to the load unit; Wherein, the load unit is also connected with an MCU detection pin (31), and the load unit is respectively connected with the switch S2, the resistor R1 and the MOS transistor Q1. 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 transistor Q2, a transistor Q3, a resistor R3, a resistor R4 and a resistor R11, and the One end of the resistor R3 is connected with the diode D1 and the diode D2, and the other end is connected with the resistor R4 and the transistor Q3. The resistor R4 is connected with the transistor Q3 and the energy storage unit; the transistor Q2 is also connected with a resistor R10, and the MCU detects The pin (31) is connected between the transistor Q2 and the resistor R10; the diode D2 is connected with the MCU control pin (32); Also includes resistor R2 and resistor R9, one end of the resistor R2 is connected with the resistor R1 and the MOS tube Q1, the other end 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 includes a capacitor C1, a capacitor C2, a capacitor C3 and a protection chip U1, and the capacitor C1, the capacitor C2, the capacitor C3 and the protection chip U1 are connected in parallel with each other.

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