CN219245783U

CN219245783U - Explosion-proof low-power consumption proximity switch sensor

Info

Publication number: CN219245783U
Application number: CN202223157824.9U
Authority: CN
Inventors: 刘芙蓉; 王全全; 沈铁; 张增旺
Original assignee: China Institute of Radio Wave Propagation CETC 22 Research Institute
Current assignee: China Institute of Radio Wave Propagation CETC 22 Research Institute
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-06-23
Anticipated expiration: 2032-11-28

Abstract

The utility model discloses an explosion-proof low-power consumption proximity switch sensor, which comprises a probe rod with a cavity, wherein an upper sealing head and a lower sealing head are respectively arranged at two ends of the probe rod, an indicator lamp electrically connected with a circuit board is arranged on the lower sealing head, the circuit board is glued in the cavity of the probe rod between the upper sealing head and the lower sealing head, a Hall magnetic switch is arranged on the circuit board, and the output end of the Hall magnetic switch is electrically connected with a socket through a cable. The proximity switch sensor disclosed by the utility model solves the problems that the existing proximity switch sensor is high in power consumption, cannot supply power for a dangerous area and cannot work for a long time for endurance. The sensor belongs to an embedded detection element, has higher reliability and safety, is an intrinsically safe proximity switch sensor, and has the advantages of portability and safety compared with other explosion-proof sensors. The integrated mechanical structure is simple and convenient to install; the whole proximity switch sensor is glued and sealed, can be immersed in water and is vibration-resistant.

Description

Explosion-proof low-power consumption proximity switch sensor

Technical Field

The utility model relates to the field of oil exploration logging, in particular to an intrinsically safe explosion-proof low-power-consumption proximity switch sensor in the field.

Background

Chinese patent No. CN201110027227.1 discloses an inductive proximity switch sensor, which comprises a coil detection circuit unit, a signal processing circuit unit, a detection coil unit disposed toward a detected object, and an excitation circuit unit for providing an excitation signal to the detection coil unit, wherein the signal processing circuit unit is connected to an output end of the coil detection circuit unit. The device has the advantages of simple and compact structure, low cost, stable and reliable operation, wide application range, high measurement precision and the like. The main defects are that the safety is poor, the safety requirement of the oil exploration site dangerous area application cannot be met, the consumed power consumption is large, the normal work can be realized only by being provided with a high-capacity lithium battery or an alternating current power supply, and the total safety and low energy consumption cannot be ensured.

Disclosure of Invention

The utility model aims to solve the technical problem that the proximity switch sensor in the prior art cannot be used in the explosion hazard zone 0 (highest hazard level), and the circuit is designed with low power consumption, so that the intrinsically safe explosion-proof low-power consumption proximity switch sensor is provided.

In order to solve the technical problems, the utility model adopts the following technical scheme:

an explosion-proof low-power consumption proximity switch sensor, which is characterized in that: the probe rod comprises a probe rod with a cavity, an upper sealing head and a lower sealing head are respectively arranged at two ends of the probe rod, an indicator lamp electrically connected with a circuit board is arranged on the lower sealing head, the circuit board is sealed in the cavity of the probe rod between the upper sealing head and the lower sealing head in a glue way, a Hall magnetic switch is arranged on the circuit board, and the output end of the Hall magnetic switch is electrically connected with a socket through a cable.

Further, a lock nut is mounted on the probe rod.

Further, the indicator light is a light emitting diode.

Further, the total capacitance number of the circuit board does not exceed 58uF.

Further, the diode V1 and the resistor R1 are connected to the input end of the hall magnetic switch, and the resistor R3 is connected to the output end of the hall magnetic switch.

Further, the pad edges of resistors R1, R3 are each spaced more than 0.5mm from the pad edge or track edge of any other component in the vicinity.

Further, the circuit board thickness was 1.5mm, the copper foil thickness was 35um, and the minimum track width was 0.635mm.

The beneficial effects of the utility model are as follows:

the proximity switch sensor disclosed by the utility model solves the problems that the existing proximity switch sensor is high in power consumption, cannot supply power for a dangerous area and cannot work for a long time for endurance. The sensor belongs to an embedded detection element, has higher reliability and safety, is an intrinsically safe proximity switch sensor, and has the advantages of portability and safety compared with other explosion-proof sensors. The integrated mechanical structure is simple and convenient to install; the whole proximity switch sensor is glued and sealed, can be immersed in water and is vibration-resistant.

The proximity switch sensor disclosed by the utility model can be safely used in the explosion hazard area 0 through the effective design of circuit spark, component heating, reliable connection and electric gap creepage distance, and improves the operation safety of a drilling site. Through using low-power consumption device, reasonable in design's operating voltage and limited power, realized low-power consumption target, it is more energy-conserving, can operate for a long time under battery power supply environment, solved because of the inconvenient problem of the stay wire power supply that needs the transportation of often transiting to lead to in the exploration scene of drilling.

Drawings

FIG. 1 is an exploded view of a proximity switch sensor as disclosed in example 1 of the present utility model;

fig. 2 is a circuit schematic of a circuit board in the proximity switch sensor disclosed in embodiment 1 of the present utility model.

Reference numerals: 1-probe rod, 2-lock nut, 3-upper end socket, 4-lower end socket, 5-circuit board, 6-cable and 7-socket.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Embodiment 1, this embodiment discloses an explosion-proof low-power consumption proximity switch sensor, is an intrinsically safe type proximity switch sensor, is the intrinsic safety product of special design for explosion dangerous place, is used for measuring rig carousel rotational speed and slush pump pumping frequency in construction such as oil drilling operation to have work pilot lamp, have low power consumption, sensitivity is high, and measuring speed is fast, waterproof nature is good, long service life, the easy to assemble, advantage such as with low costs.

As shown in fig. 1, the probe comprises a probe rod 1 with a cavity, and a lock nut 2 is arranged on the probe rod and used for fixing a proximity switch sensor. The two ends of the probe rod are respectively provided with an upper end socket 3 and a lower end socket 4, a light-emitting diode V2 electrically connected with a circuit board is arranged on the lower end socket, a circuit board 5 is glued in a cavity of the probe rod between the upper end socket and the lower end socket, as shown in fig. 2, a Hall magnetic switch D1 (A3213 ELHLT-T) is arranged on the circuit board, and the output end of the Hall magnetic switch is electrically connected with a socket 7 through a cable 6. The diode V1 and the resistor R1 are connected to the input end of the Hall magnetic switch, and the resistor R3 is connected to the output end of the Hall magnetic switch.

The proximity switch sensor adopts a magnetic induction working mode, a magnetic device is arranged at an induced end (for example, a magnet is adsorbed at a magnetic induction part of an object to be detected), when an external magnetic device sweeps across the Hall magnetic switch D1, a pulse signal is output at the output end of the Hall magnetic switch D1 through a resistor R3, and the pulse signal is output by a waterproof connector and can be used for detecting the approaching and the far-away states of the object or the rotation count and the frequency of the circular moving object. The led V2 also changes on and off to indicate the sensed state of the magnetic device. The diode V1 serves as a power input terminal to prevent reverse connection of an external power supply.

In order to realize an explosion-proof design (Exia IIC T5 Ga) of the proximity switch sensor, circuit sparks, component heating, reliable connection and an electric gap creepage distance are required to be designed in a circuit board. The capacitor is constrained to prevent spark ignition, and the capacitance value of the capacitor is reduced on the premise of meeting the circuit function, so that the total capacitance number is not more than 58uF, and the requirements of the intrinsic safety IIC type equipment under the 5.4V working condition are met. Secondly, in order to limit the heating temperature of the circuit, resistors R1 and R3 are designed, wherein the resistor R1 limits the maximum power of a rear end device on the whole circuit board, and the resistor R3 protects the Hall magnetic switch D1, so that the temperature rise of the Hall magnetic switch D1 is at the maximum working condition of 80 ℃, and the requirement that the maximum surface temperature of the explosion-proof type II T5 group is less than 150 ℃ is met.

Temperature rise control design is performed in the aspects of proximity switch sensor wires and PCB wiring of a circuit board, RVVP is used for the circuit board to plug, and 4x0.4mm is used for the circuit board to plug ² Wires allowing maximum current of 5.6A, circuit board to light emitting diode using ASTMR, 0.2mm ² And the lead is led to pass current to meet the requirement under the condition of the temperature group T5. For the PCB design of the circuit board, the thickness of the copper foil is 35um, the minimum printed wiring width is 0.635mm (25 mil), and the requirements of the PCB printed wiring under the condition of the temperature group T5 are met.

In the aspect of electric gap creepage distance design, by increasing reliable element resistors R1 and R3, the voltage of a circuit board is enabled to be lower than 10V, no provision is required for CTI index of an insulating material, GD406 silicon rubber (-60-200 ℃ long-term use) is used for encapsulating the circuit board, the requirement on ia is 0.5mm when 10V is used, and the distances from the pad edges of resistors R1 and R3 on the PCB to the pad edges or the printed line edges of any other surrounding elements are all larger than 0.5mm, so that the design requirement of the intrinsic safety ia of working voltage below 10V is met.

In order to realize low power consumption of the proximity switch sensor, firstly, a Hall magnetic switch D1 chip in a circuit board is selected as a low power consumption device; secondly, enabling the circuit board circuit to work in a low-voltage state; finally, on the premise of meeting the working condition, a high-resistance resistor, such as R2, is selected, so that the heat loss in the circuit of the circuit board is reduced, and the low-power consumption design of the circuit board is realized.

Claims

1. An explosion-proof low-power consumption proximity switch sensor, its characterized in that: the probe rod comprises a probe rod with a cavity, an upper sealing head and a lower sealing head are respectively arranged at two ends of the probe rod, an indicator lamp electrically connected with a circuit board is arranged on the lower sealing head, the circuit board is sealed in the cavity of the probe rod between the upper sealing head and the lower sealing head in a glue way, a Hall magnetic switch is arranged on the circuit board, and the output end of the Hall magnetic switch is electrically connected with a socket through a cable.

2. The explosion-proof low power proximity switch sensor according to claim 1, wherein: a lock nut is mounted on the probe rod.

3. The explosion-proof low power proximity switch sensor according to claim 1, wherein: the indicator light is a light-emitting diode.

4. The explosion-proof low power proximity switch sensor according to claim 1, wherein: the total capacitance of the circuit board does not exceed 58uF.

5. The explosion-proof low power proximity switch sensor according to claim 1, wherein: the diode V1 and the resistor R1 are connected to the input end of the Hall magnetic switch, and the resistor R3 is connected to the output end of the Hall magnetic switch.

6. The explosion-proof low power proximity switch sensor according to claim 5, wherein: the pad edges of resistors R1, R3 are each more than 0.5mm from the pad edge or track edge of any other element in the surroundings.

7. The explosion-proof low power proximity switch sensor according to claim 1, wherein: the circuit board thickness was 1.5mm, the copper foil thickness was 35um, and the minimum track width was 0.635mm.