Proximity switch suitable for ultrahigh pressure environment

Abstract

A proximity switch suitable for an ultrahigh voltage environment comprises a shell, a front cover, a rear cover, an inductance coil, a circuit module and a connector socket, the inductance coil and the circuit module are sequentially arranged in the shell from left to right, one end of the rear cover is connected with a right port of the shell, and the other end of the rear cover is connected with the connector socket. The front cover is embedded in a left port of the shell, and the joint of the front cover and the shell is sealed through a nitrile rubber ring. Through the design of the front cover, the proximity switch is suitable for an ultrahigh-pressure working environment, the magnetic core of the inductance coil is not prone to being damaged permanently, the service life is long, and through the improvement of the arrangement position of the sealing ring and the optimization of the structure of the proximity switch, the sealing effect is achieved, and the structure is simplified.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the electric appliance automation technical field, especially a kind of proximity switch suitable for superhigh pressure environment. BACKGROUND

[0002] Proximity switch is non-contact switch, i.e. without direct contact with the object to be detected and can be controlled position switch, can be applied to industrial control mechanism, the position signal feedback of executive component, with reliable operation, stable performance, high repeat positioning accuracy, no mechanical wear, long service life, no spark, no noise, strong anti-interference ability, strong environmental adaptability and other outstanding advantages.Proximity switch is the application of Hall effect, eddy current effect and other principles, the process of converting physical signal into electrical signal, to trigger switch output signal, achieve detection position, limit control, metering control and other effects.

[0003] Traditional proximity switch cannot work in high pressure environment due to its own design, and the superhigh pressure working environment will deform the proximity switch plastic front cover or metal head, causing the internal magnetic core of inductor coil to be damaged, which cannot meet the use of superhigh pressure environment, in order to meet the use of superhigh pressure environment, the prior art improves the traditional proximity switch.

[0004] As the patent file with publication number CN211606509U, specifically discloses a proximity switch with high pressure resistance function, including shell, circuit board, waterproof cover, ceramic detection head and cable, the circuit board is fixedly arranged in the interior of the shell, the circuit board is filled with gelatinous substance between the shell, the waterproof cover is arranged at one end of the shell, the detection head is installed at the other end of the shell, the waterproof cover and the shell are filled with gelatinous substance between the detection head and the shell, the waterproof cover is provided with glue injection hole, the glue injection hole is used for guiding gelatinous substance into the interior of shell, the waterproof line is installed in the glue injection hole, and the waterproof line and the glue injection hole are fixed by gelatinous substance.

[0005] The above prior art improves the detection head of proximity switch to adapt to high pressure working environment, but the proximity switch of the above prior art does not contain inductor coil, so it is not applicable to proximity switch containing inductor coil, and the technical problem of internal magnetic core damage of inductor coil caused by deformation of front cover in superhigh pressure environment has not been solved.

[0006] Therefore, it is necessary to design a proximity switch capable of protecting the internal magnetic core of inductor coil from damage in superhigh pressure working environment. UTILITY MODEL CONTENTS

[0007] In view of the problems existing in the prior art, the utility model provides a proximity switch suitable for superhigh pressure environment.

[0008] The utility model discloses a kind of proximity switches suitable for ultrahigh pressure environment, including shell, front cover, back cover, inductance coil, circuit module and connector socket, the inside of the shell is sequentially arranged inductance coil and circuit module from left to right, one end of the back cover is connected with the right port of the shell, another end is connected with the connector socket, the front cover is embedded in the left port of the shell, the front cover and the junction of the shell are sealed with nitrile rubber ring.

[0009] Further, one side of the front cover is provided as a smooth flat surface, the other side is provided as a hollow protruding structure, the smooth flat surface is flush with the left port of the shell, the hollow protruding structure is embedded in the left port of the shell, and the inductance coil is placed in the inner groove of the hollow protruding structure.

[0010] Further, the front cover is made of zirconia ceramic.

[0011] Further, a spiral groove is provided on the middle section of the inner wall of the shell.

[0012] Further, the circuit module is fixed by pouring polyurethane resin glue in the inside of the shell.

[0013] Further, the front end of the circuit module is a driving circuit, and the rear end is a filter circuit, the input end of the driving circuit is connected with the inductance coil, the output end of the driving circuit is connected with the input end of the filter circuit, and the output end lead of the filter circuit is led out from the connector socket through the back cover.

[0014] Further, the driving circuit includes a driving chip U1, an inductance L1, capacitors C1-C7, resistors R1-R11, magnetic beads CZ1 and CZ2, transient voltage suppression diodes TVS1 and TVS2, a zener diode ZD1, a light-emitting diode LED1, a triode Q1, and a diode D1. The pin 1 of the driving chip U1 is connected with the capacitor C1. The inductance L1, the capacitor C2, and the capacitor C3 are connected in parallel, and one end is connected with the capacitor C7 in series, and the other end is connected with the pin 2 of the driving chip U1. The pin 3 of the driving chip is connected with the resistor R1. The resistor R2 and the resistor R3 are connected in parallel, and one end is connected with the resistor R1 in series, and the other end is connected with the resistor R4 in series. The capacitor C1, the pins 4 and 5 of the driving chip U1, the resistor R4, and the magnetic bead CZ2 are all connected with the capacitor C7, and the capacitor C7 is grounded.

[0015] The one end of the 6-pin of the driving chip U1, the magnetic bead CZ1, the resistance 8, the capacitor C5 and the voltage stabilizing diode ZD1 in parallel is connected with the direct power supply VCC; the other end of the capacitor C5 and the voltage stabilizing diode ZD1 in parallel is grounded GND; the 6-pin and the 8-pin of the driving chip U1 are connected through the capacitor C4; the resistance R5 is connected with the 8-pin of the driving chip U1 and the emitter of the triode Q1; the one end of the light emitting diode LED1 and the resistance R11 in parallel is connected with the 7-pin of the driving chip U1, and the other end is connected with the direct power supply VCC after being connected with the resistance R6 in series; the 7-pin of the driving chip is connected with the resistance R7 and then connected with the base of the triode Q1, the collector lead BK of the triode Q1 outputs the control signal to the filter circuit, the one end of the capacitor C6 and the transient voltage suppression diode TVS1 is connected with the magnetic bead CZ1, the diode D1 and the transient voltage suppression diode TVS2, and the other end is connected with the direct voltage V-; the other end of the diode D1 is connected with the positive pole of the power supply of the filter circuit; the other end of the transient voltage suppression diode TVS2 is connected with the collector of the triode Q1; the resistance R10 is connected with the transient voltage suppression diode TVS2 and then connected with the magnetic bead CZ2; the magnetic bead CZ2 and the resistance R9 are connected in series and then connected with the ground end of the filter circuit through the lead BU.

[0016] Further, the outer diameter of the one end of the rear cover connected with the shell is less than or equal to the inner diameter of the right port of the shell, and the inner diameter of the one end of the rear cover connected with the connector socket is greater than or equal to the outer diameter of the lead connection end of the connector socket.

[0017] Further, the left end of the rear cover is inserted into the right port of the shell, and the connection between the rear cover and the right port of the shell is welded by laser.

[0018] Further, the lead connection end of the connector socket is inserted from the right port of the rear cover, and the connection between the connector socket and the rear cover is welded by laser.

[0019] In summary, the utility model has the advantages of:

[0020] (1) the front cover made of zirconia ceramic is adopted, so that the proximity switch can meet the requirement of normal work under the superhigh pressure environment of 500MPa-2000MPa, and the front cover does not deform.

[0021] (2)The utility model discloses a hollow convex structure is placed in the front cover's inner recess of inductance coil, makes the installation structure of front cover and inductance coil more closely, and under the protection of the front cover recess encircles, inductance coil has obtained the further protection, has improved the extrusion resistance of inductance coil from structure, and the service life of proximity switch is improved, and the loss is reduced.

[0022] (3)The utility model discloses a zirconium oxide ceramic front cover and shell's junction is sealed with nitrile rubber ring only, reaches the sealing requirement of proximity switch, and need not additional sealing ring, under the condition of reaching the same sealing technical effect, the structure of the utility model is further optimized, and the structure is more simple.

[0023] (4)The utility model discloses the middle section of the inner wall of shell is provided with spiral groove, and the friction between polyurethane resin glue and the inner wall of shell is increased, and the installation is more firm. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be to the embodiment description needed to use the drawing briefly introduces.

[0025] Figure 1 It is the internal structure schematic diagram of proximity switch after the utility model discloses being applicable to the superhigh pressure environment's filling and sealing;

[0026] Figure 2 It is the external structure schematic diagram of proximity switch of the utility model discloses being applicable to the superhigh pressure environment;

[0027] Figure 3 It is the internal structure schematic diagram of proximity switch before the utility model discloses being applicable to the superhigh pressure environment's filling and sealing;

[0028] Figure 4 It is the drive circuit diagram of proximity switch of the utility model discloses being applicable to the superhigh pressure environment;

[0029] Brief description of drawings: 1-inductance coil, 2-circuit module, 3-shell, 4-zirconium oxide ceramic front cover, 5-rear cover, 6-connector socket, 7-polyurethane resin glue, 8-nitrile rubber ring, 9-spiral groove. DETAILED DESCRIPTION

[0030] The technical scheme in the utility model embodiment will be clearly and completely described in the following combined with the drawings in the utility model embodiment, obviously, the described embodiment only is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments that the ordinary skill in the art obtains without making the creative labor belong to the scope of the utility model protection.

[0031] As Figures 1-4 The utility model discloses a kind of proximity switches suitable for ultrahigh pressure environment, including shell 3, front cover 4, back cover 5, inductance coil 1, circuit module 2 and connector socket 6, the inside of the shell 3 is sequentially arranged inductance coil 1 and circuit module 2 from left to right, one end of the back cover 5 is connected with the right port of the shell 3, another end is connected with the connector socket 6, the front cover 4 is embedded in the left port of the shell 3, the front cover 4 and the junction of the shell 3 are sealed with nitrile rubber ring 8. By embedding the front cover 4 into the shell 3, the extrusion resistance between the front cover 4 and the shell 3 is improved, the front cover 4 is not easy to deform, and the overall structure is improved in appearance. By the setting of nitrile rubber ring 8, the proximity switch and the sealing requirement are achieved without additional sealing components, and the structure of the proximity switch is optimized.

[0032] In the embodiment, one side of the front cover 4 is provided as a flat smooth surface, and the other side is provided as a hollow protruding structure. The smooth surface is flush with the left port of the shell 3, and the hollow protruding structure is embedded in the left port of the shell 3. The inductance coil 1 is placed in the inner groove of the hollow protruding structure. By providing the inner groove in the hollow protruding structure of the front cover 4, the front cover 4 and the inductance coil 1 are easily connected. By setting the other end of the front cover 4 as a smooth surface, the flatness of the connection between the front cover 4 and the shell 3 is improved, and the overall structure is improved in appearance. By placing the inductance coil 1 in the inner groove, the tightness of the connection between the shell 3, the front cover 4, and the inductance coil 1 is enhanced, further improving the extrusion resistance of the front cover 4 and the inductance coil 1, protecting the magnetic core of the inductance coil 1 from permanent damage, and improving the service life of the proximity switch.

[0033] In the embodiment, the front cover 4 is made of zirconia ceramic, allowing the proximity switch to function in an environment of 500MPa-2000MPa. The high-pressure and high-temperature resistance of the front cover 4 is improved, further enhancing the extrusion resistance of the front cover 4 and making it less prone to deformation.

[0034] In the embodiment, as shown in Figure 3 The middle section of the inner wall of the shell 3 is provided with a spiral groove 9. The spiral groove 9 increases the friction between the inner wall of the shell 3 and the filling material, improving the firmness of the filling.

[0035] In the embodiment, the circuit module 2 is fixed by filling polyurethane resin glue 7 inside the shell 3. The polyurethane resin glue 7 used for filling does not corrode electrical components and is waterproof and moisture-proof, with excellent electrical insulation and flame resistance. It protects and fixes the circuit module 2.

[0036] In this embodiment, as Figure 1 As shown, the front end of the circuit module 2 is a driving circuit, and the rear end is a filtering circuit. The input end of the driving circuit is connected to the inductor coil 1, and the output end of the driving circuit is connected to the input end of the filtering circuit. The output lead of the filtering circuit is led out from the connector socket 6 through the rear cover 5. The filtering circuit can use existing general filtering circuits according to filtering requirements.

[0037] In this embodiment, as Figure 4 As shown, the driving circuit includes a driving chip U1, an inductor L1, capacitors C1 to C7, resistors R1 to R11, ferrite beads CZ1 and CZ2, transient voltage suppressor diodes TVS1 and TVS2, a Zener diode ZD1, an LED1, a transistor Q1, and a diode D1. Pin 1 of the driving circuit U1 is connected to capacitor C1. One end of the parallel connection of inductor L1, capacitor C2, and capacitor C3 is connected in series with capacitor C7, and the other end is connected to pin 2 of the driving chip U1. Pin 3 of the driving chip is connected to resistor R1. One end of the parallel connection of resistors R2 and R3 is connected in series with resistor R1, and the other end is connected in series with resistor R4. Capacitor C1, pins 4 and 5 of the driving chip U1, resistor R4, and ferrite bead CZ2 are all connected to capacitor C7, and capacitor C7 is grounded (GGND).

[0038] One end of the parallel connection between pin 6 of the driver chip U1, the ferrite bead CZ1, resistor 8, capacitor C5, and Zener diode ZD1 is connected to the direct power supply VCC; the other end of the parallel connection between capacitor C5 and Zener diode ZD1 is grounded to GND; pins 6 and 8 of the driver chip U1 are connected via capacitor C4; resistor R5 is connected to pin 8 of the driver chip U1 and to the emitter of transistor Q1; one end of the parallel connection between LED1 and resistor R11 is connected to pin 7 of the driver chip U1, and the other end is connected in series with resistor R6 and then to the DC power supply VCC; pin 7 of the driver chip is connected to resistor R7 and then to the base of transistor Q1. The collector lead BK of the transistor Q1 outputs a control signal to the filter circuit. One end of the capacitor C6 and the transient voltage suppressor diode TVS1 connected in parallel is connected to the ferrite bead CZ1, diode D1 and transient voltage suppressor diode TVS2, and the other end is connected to the DC voltage V-. The other end of the diode D1 is connected to the positive terminal of the power supply of the filter circuit via a lead BN. The other end of the transient voltage suppressor diode TVS2 is connected to the collector of the transistor Q1. The resistor R10 is connected to the transient voltage suppressor diode TVS2 and then to the ferrite bead CZ2. The ferrite bead CZ2 is connected in series with the resistor R9 and then has a lead BU connected to the ground terminal of the filter circuit.

[0039] In the embodiment, the outer diameter of the end of the rear cover 5 connected with the shell 3 is less than or equal to the inner diameter of the right port of the shell 3, and the inner diameter of the end of the rear cover 5 connected with the connector socket 6 is greater than or equal to the outer diameter of the lead connecting end of the connector socket 6, so that the assembly operation is simple and easy to understand by limiting the matching sizes.

[0040] In the embodiment, the left end of the rear cover 5 is inserted into the right port of the shell 3, and the connection between the rear cover 5 and the right port of the shell 3 is welded by laser, so that the connection is firm and sealed, and the overall sealing of the proximity switch is improved.

[0041] In the embodiment, the lead connecting end of the connector socket 6 is inserted into the right port of the rear cover 5, and the connection between the connector socket 6 and the rear cover 5 is welded by laser, so that the connection is firm and sealed, and the overall sealing of the proximity switch is improved.

[0042] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields, or the like within the scope of the present application are included in the patent protection range of the present application.

Claims

1. A proximity switch suitable for use in an ultra-high pressure environment, characterized by: The application relates to a circuit module, which comprises a shell (3), a front cover (4), a rear cover (5), an inductor coil (1), a circuit module (2) and a connector socket (6), the inside of the shell (3) is sequentially provided with the inductor coil (1) and the circuit module (2) from left to right, one end of the rear cover (5) is connected with the right port of the shell (3), the other end is connected with the connector socket (6), the front cover (4) is embedded in the left port of the shell (3), and the joint between the front cover (4) and the shell (3) is sealed by a nitrile rubber ring (8).

2. The proximity switch suitable for use in an ultra-high pressure environment of claim 1, wherein: One side of the front cover (4) is provided with a smooth flat surface, and the other side is provided with a hollow convex structure, the smooth flat surface is flush with the left port of the shell (3), the hollow convex structure is embedded in the left port of the shell (3), and the inductor coil (1) is placed in the inner groove of the hollow convex structure.

3. The proximity switch suitable for use in an ultra-high pressure environment of claim 2, wherein: The front cover (4) is made of zirconia ceramic.

4. The proximity switch suitable for use in an ultra-high pressure environment of claim 1, wherein: The middle section of the inner wall of the shell (3) is provided with a spiral groove (9).

5. The proximity switch suitable for use in an ultra-high pressure environment of claim 4, wherein: The circuit module (2) is fixed by pouring polyurethane resin glue (7) in the inside of the shell (3).

6. The proximity switch suitable for use in an ultra-high pressure environment of claim 5, wherein: The front end of the circuit module (2) is a driving circuit, and the rear end is a filter circuit, the input end of the driving circuit is connected with the inductor coil (1), the output end of the driving circuit is connected with the input end of the filter circuit, and the output lead of the filter circuit is led out from the connector socket (6) through the rear cover (5).

7. The proximity switch suitable for use in an ultra-high pressure environment of claim 6, wherein: The driving circuit comprises a driving chip U1, an inductor L1, capacitors C1-C7, resistors R1-R11, magnetic beads CZ1 and CZ2, transient voltage suppression diodes TVS1 and TVS2, a voltage stabilizing diode ZD1, a light emitting diode LED1, a triode Q1 and a diode D1, the 1 pin of the driving circuit U1 is connected with the capacitor C1, one end of the parallel connection of the inductor L1, the capacitor C2 and the capacitor C3 is connected with the capacitor C7 in series, and the other end is connected with the 2 pin of the driving chip U1; the 3 pin of the driving chip is connected with the resistor R1, one end of the parallel connection of the resistor R2 and the resistor R3 is connected with the resistor R1 in series, and the other end is connected with the resistor R4 in series; the capacitor C1, the 4 pin and the 5 pin of the driving chip U1, the resistor R4 and the magnetic bead CZ2 are all connected with the capacitor C7, and the capacitor C7 is grounded. The 6-pin of the driving chip U1, the magnetic bead CZ1, the resistance 8, the capacitor C5 and the one end of the parallel connection of the voltage stabilizing diode ZD1 are connected with the direct power supply VCC; the other end of the parallel connection of the capacitor C5 and the voltage stabilizing diode ZD1 is grounded GND; the 6-pin and the 8-pin of the driving chip U1 are connected through the capacitor C4; the resistance R5 connects the 8-pin of the driving chip U1 and is connected with the emitter of the triode Q1; the one end of the parallel connection of the light emitting diode LED1 and the resistance R11 is connected with the 7-pin of the driving chip U1, and the other end is connected with the direct current power supply VCC after being connected with the resistance R6 in series; the 7-pin of the driving chip is connected with the base of the triode Q1 after being connected with the resistance R7, the collector lead BK of the triode Q1 outputs the control signal to the filter circuit, the one end of the parallel connection of the capacitor C6 and the transient voltage suppression diode TVS1 is connected with the magnetic bead CZ1, the diode D1 and the transient voltage suppression diode TVS2, and the other end is connected with the direct current voltage V-; the other end of the diode D1 is connected with the positive pole of the power supply of the filter circuit through the lead BN; the other end of the transient voltage suppression diode TVS2 is connected with the collector of the triode Q1; the resistance R10 is connected with the transient voltage suppression diode TVS2 and is connected with the magnetic bead CZ2; the magnetic bead CZ2 is connected with the resistance R9 in series and is connected with the ground end of the filter circuit through the lead BU.

8. The proximity switch suitable for use in an ultra-high pressure environment of claim 6, wherein: The outer diameter of the one end of the rear cover (5) connected with the shell (3) is less than or equal to the inner diameter of the right port of the shell (3), and the inner diameter of the one end of the rear cover (5) connected with the connector socket (6) is greater than or equal to the outer diameter of the lead connection end of the connector socket (6).

9. The proximity switch suitable for use in an ultra-high pressure environment of claim 7, wherein: The left end of the rear cover (5) is inserted into the right port of the shell (3), and the connection between the rear cover (5) and the right port of the shell (3) is laser welded.

10. The proximity switch suitable for use in an ultra-high pressure environment of claim 6, wherein: The lead connection end of the connector socket (6) is inserted from the right port of the rear cover (5), and the connection between the connector socket (6) and the rear cover (5) is laser welded.

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