Multi-channel programmable explosion-proof digital display pressure sensor

Abstract

The invention discloses a multi-channel programmable explosion-proof digital display pressure sensor. Comprising a shell, a man-machine interaction module, an acquisition module, an auxiliary module, an analog channel and a digital channel, wherein the man-machine interaction module is arranged in the shell and is used for checking a current measured value and modifying configuration information to complete man-machine interaction; the acquisition module is used for acquiring a medium pressure signal; the analog channel is used for realizing analog signal output; the communication channel is used for realizing I-Li < nk > bus communication, the M12-5-core waterproof connector is used for outputting signals in the analog channel, the digital channel and the communication channel and inputting a main power supply, and the core controller is used for controlling and coordinating electricity of all parts of the whole machine and has a data operation function. According to the invention, the measurement mode can be arbitrarily configured into an absolute pressure mode and a relative pressure mode, and the measurement medium can be any non-corrosive liquid and gas medium, so that the application range is wider.

Description

Technical Field

[0001] The invention relates to the technical field of pressure sensors, and in particular to a multi-channel programmable explosion-proof digital display pressure sensor. Background Art

[0002] Pressure sensor is a device or apparatus that can sense pressure signal and convert it into an output electrical signal according to certain rules. Pressure sensor is the most commonly used sensor in process control. It is widely used in various automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil well, electricity, shipbuilding, machine tools, pipelines and many other industries.

[0003] At present, the mainstream digital pressure sensors in the market can be divided into NPN open-drain output type, PNP open-drain output type, 0.00-10.00V analog voltage output type, 0.00-20.00mA analog current output type and 4.00-20.00mA analog current output type according to the output type. Taking into account the increasingly large and complex process control systems in modern times, for a certain sensor in the system, there are usually two or more "host computers" with different input signal types. However, for the mainstream digital pressure sensors in the market at this stage, if they are applied to the above systems, they also need to add a signal transmission module as an "intermediate device" to meet the requirements of the process control system for the sensor signal interface. The additional "intermediate device" increases the manufacturing cost of the process control system and significantly reduces the stability.

[0004] Some sensor manufacturers have designed and produced digital pressure sensors with composite signal type outputs to address the above problems. However, some process control systems with strong customization requirements still have functional requirements for digital pressure sensors, such as digital signal action logic adjustment, analog signal type switching (current / voltage), analog signal-pressure signal mapping relationship adjustment, and extreme data recording. In some extremely complex and harsh application environments, process control systems have higher requirements for electromagnetic compatibility, vibration performance, salt spray corrosion, and temperature shock performance for digital pressure sensors. Some process control systems with higher precision requirements also have higher requirements for repeatability, temperature drift, and measurement accuracy for digital pressure sensors. In some process control systems with confined spaces, since it is inconvenient for operators to directly operate digital pressure sensors to modify configuration information, digital pressure sensors are also required to have the function of remotely configuring working parameters.

[0005] In addition, in process control systems in certain gas explosive hazardous environments, since only explosion-proof pressure sensors can be used, the selection of pressure sensors is further limited. Currently, there are a large number of mature pressure sensor products on sale in the domestic and foreign markets, but they have single functions and often require additional "intermediate equipment" to meet the usage requirements of the scenario, which also increases the manufacturing cost and stability of the process control system. More importantly, these additional connections make the operation safety of the process control system in gas explosive hazardous environments subject to additional challenges. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-channel programmable explosion-proof digital pressure sensor in order to solve the above problems and overcome the defects of the prior art, as described in detail below.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A multi-channel programmable explosion-proof digital pressure sensor provided by the present invention comprises a housing and a human-machine interaction module provided in the housing for viewing current measurement values ​​and modifying configuration information to complete human-machine interaction, an acquisition module for medium pressure signal acquisition, an auxiliary module, an analog channel for realizing analog signal output, a digital channel for realizing digital signal output, a communication channel for realizing IO-Link bus communication, an M12-5 core waterproof connector for signal output in the analog channel, the digital channel and the communication channel and for main power input, a core controller and a power isolation step-down circuit for electrical control, coordination and data operation functions of all parts of the whole machine;

[0009] Among them, the human-computer interaction module, the acquisition module, the auxiliary module, the analog channel, the digital channel and the communication channel are respectively connected to each other with the core controller;

[0010] The power isolation step-down circuit is connected to the M12-5 core waterproof connector to step down the input main power supply to supply power to all circuits of the whole machine;

[0011] The shell is provided with a micro through hole, an explosion-proof vent valve is arranged in the micro through hole, and a waterproof breathable membrane is arranged at the port of the micro through hole.

[0012] Preferably, the human-computer interaction module includes an OLED display screen for displaying real-time pressure values ​​and configuration information and a capacitive touch panel for real-time acquisition of its touch status, and the OLED display screen and the capacitive touch panel are respectively connected to the core controller.

[0013] Preferably, the acquisition module includes an analog signal conditioning circuit for conditioning weak piezoelectric signals and transmitting the obtained pressure signals to the core control unit for sampling. The analog signal conditioning circuit is connected to a piezoelectric pressure transmitter for directly converting the medium pressure signal in the target pipeline into a weak piezoelectric signal and transmitting it to the core control unit. The analog signal conditioning circuit and the core controller are connected to each other.

[0014] Preferably, the auxiliary module includes an F-RAM memory for storing and reading configuration information and a precision voltage reference source for providing a voltage reference source to the core controller, the F-RAM memory and the core controller are connected to each other, and the precision voltage reference source and the core controller are connected to each other.

[0015] Preferably, the analog channel includes a precision current loop driver for outputting analog current signals, a precision voltage driver for outputting analog voltage signals, and an isolation combiner for combining the analog precision current loop driver and the precision voltage driver and outputting them to the outside through an M12-5 core waterproof connector. The precision current loop driver and the precision voltage driver are respectively connected to the core controller, and the isolation combiner is respectively connected to the precision current loop driver, the precision voltage driver and the M12-5 core waterproof connector.

[0016] Preferably, the digital channel includes a high-side switch for outputting a PNP open-drain type digital signal, a low-side switch for outputting an NPN open-drain type digital signal, and an isolation combiner 2 for combining the high-side switch and the low-side switch and outputting them to the outside through an M12-5-core waterproof connector. The high-side switch and the low-side switch are respectively connected to the core controller, and the isolation combiner 2 is respectively connected to the high-side switch, the low-side switch and the M12-5-core waterproof connector.

[0017] Preferably, the communication channel includes an IO-Link interface circuit, the IO-Link interface circuit is connected to the core controller, and the IO-Link interface circuit is connected to the M12-5 core waterproof connector through an EMC network.

[0018] Preferably, the thickness of the shell is 5.0 mm, and the shell is made of 440C super-hard martensitic stainless steel material.

[0019] The beneficial effects are:

[0020] 1. The measuring method of the present invention can be arbitrarily configured as absolute pressure method and relative pressure method, and the measuring medium can be any non-corrosive liquid and gas medium, making its application scope wider;

[0021] 2. The measured value can be viewed on-site through the human-machine interaction module or remotely through the IO-Link bus. All configuration information can be viewed and adjusted (programmed) on-site through the human-machine interaction module, or remotely viewed and modified through the IO-Link bus, making it easier to operate;

[0022] 3. It has analog channels, digital channels and communication channels. The three channels can be enabled, disabled or enabled separately at the same time. The more flexible and changeable adjustment makes it applicable to various complex process control system environments;

[0023] 4. The analog channel signal output type can be configured as disabled, current signal type and voltage signal type. The linear mapping relationship between the output signal and the measured value can be arbitrarily configured, so that the analog signal can be uploaded to most process control data acquisition devices, which has better applicability;

[0024] 5. Its digital channel signal output type can be configured as disabled, NPN open drain type, PNP open drain type and push-pull type, the action logic can be configured as normally open, normally closed, normally low or normally high, and the action mode can be configured as single point, window and hysteresis, so that it can drive relays, valves or acquisition equipment in most process control systems, with better applicability;

[0025] 6. The working status of its communication channel includes communication status and digital status, and the communication status is always the first priority status: in the communication status, the IO-Link master station and the real-time access to the present invention through the IO-Link bus can be used to remotely view the measurement value, configuration information or adjust the configuration information in real time, which provides convenience for the configuration information adjustment of the process control site in some confined spaces; in the digital status, its operating characteristics are exactly the same as the digital channel signal. As an extension, it is convenient to operate two relays, valves or acquisition equipment at the same time with different digital signal output types, action logics and action modes at the process control site;

[0026] 7. It has the function of recording over-limit measurement events. The over-limit threshold can be adjusted to facilitate recording of abnormal state events of the measured medium pressure, thus improving the reliability and safety of the process control system;

[0027] 8. With sealed housing, isolated touch operation mode and M12-5 core waterproof connector design, it can achieve IP69K protection level;

[0028] 9. It has good explosion-proof performance and can be used in gas explosion hazardous areas;

[0029] 10. It has a high EMC performance level and is suitable for EMC-sensitive and harsh EMC environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a circuit principle block diagram of the present invention;

[0032] Figure 2 is a front view of the upper surface of the housing of the present invention;

[0033] Figure 3 is a cross-sectional view of the upper surface of the housing of the present invention;

[0034] Figure 4 It is a topological structure diagram of the process control system of the present invention.

[0035] The description of the accompanying drawings is as follows: 1. OLED display screen; 2. Capacitive touch panel; 3. Piezoelectric pressure transmitter; 4. Analog signal conditioning circuit; 5. F-RAM memory; 6. Precision voltage reference source; 7. Core controller; 8. Precision current loop driver; 9. Precision voltage driver; 10. High-side switch; 11. Low-side switch; 12. IO-Link interface circuit; 13. Isolation combiner 1; 14. Isolation combiner 2; 15. EMC network; 16. M12-5 core waterproof connector; 17. Micro through hole; 18. Waterproof breathable membrane; 19. Housing; 20. Explosion-proof vent valve. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0037] See also Figure 1-Figure 4 As shown, the present invention provides a multi-channel programmable explosion-proof digital pressure sensor, which has two measurement modes of absolute pressure and relative pressure, associated measurement mode configuration information, and a measuring range of 0.00-600.00bar; it has an over-limit measurement event recording function, and associated over-limit measurement threshold configuration information.

[0038] A multi-channel programmable explosion-proof digital pressure sensor includes a human-computer interaction module composed of an OLED display screen 1 and a capacitive touch panel 2, an acquisition module composed of a piezoelectric pressure transmitter 3 and an analog signal conditioning circuit 4, an auxiliary module composed of an F-RAM memory 5 and a precision voltage reference source 6, an analog channel composed of a precision current loop driver 8, a precision voltage driver 9 and an isolation combiner 13, a digital channel composed of a high-side switch 10, a low-side switch 11 and an isolation combiner 2 14, a communication channel composed of an IO-Link interface circuit 12 and an EMC network 15, and an M12-5 core waterproof connector 16, a core controller 7 and a power isolation step-down circuit; wherein the core controller 7 is used for the electrical control, coordination and data calculation functions of all parts of the whole machine; wherein the isolation combiner 1 13 has the function of electrically isolating and limiting the output analog signal; the isolation combiner 2 14 has the function of electrically isolating and limiting the output digital signal;

[0039] The human-computer interaction module is used to complete human-computer interaction, that is, to view the current measurement value and modify the configuration information, etc., wherein: the OLED display screen 1 is connected to the core controller 7 and driven by the core controller 7 to display the real-time pressure value and configuration information, etc.; the capacitive touch panel 2 is connected to the core controller 7, and the core controller 7 collects its touch status in real time;

[0040] The acquisition module is used for medium pressure signal acquisition, wherein: the piezoelectric pressure transmitter 3 is connected to the analog signal conditioning circuit 4, and is used to directly convert the absolute pressure signal of the medium pressure in the target pipeline into a weak piezoelectric signal and transmit it to the analog signal conditioning circuit 4; the analog signal conditioning circuit 4 is connected to the core controller 7, and is used to perform signal conditioning on the weak piezoelectric signal, and transmit the obtained pressure signal to the core controller 7 for sampling;

[0041] The auxiliary module is used to realize auxiliary functions, wherein: the F-RAM memory 5 is connected to the core controller 7 and driven by the core controller 7, and is used to store and read configuration information, etc.; the precision voltage reference source 6 is connected to the core controller 7, and is used to provide a voltage reference source to the core controller 7;

[0042] The analog channel is used to realize analog signal output, wherein: the precision current loop driver 8 is connected to the core controller 7 and driven by the core controller 7 to output analog current signals; the precision voltage driver 9 is connected to the core controller 7 and driven by the core controller 7 to output analog voltage signals; the isolation combiner 13 is respectively connected to the precision current loop driver 8, the precision voltage driver 9 and the M12-5 core waterproof connector 16, and is used to combine the above-mentioned analog precision current loop driver 8 and precision voltage driver 9 and output them to the outside through the M12-5 core waterproof connector 16; the signal output type of the analog channel can be configured as disabled, current signal type and voltage signal type, and the analog channel output type configuration information is associated; the current signal type output range of the analog channel is 0.00-20.00mA, and the voltage signal type output range is 0.00-10.00V; the linear mapping relationship between the output signal of the analog channel and the measured value can be arbitrarily adjusted within the range and output range, and the analog channel output mapping relationship configuration information is associated.

[0043] The digital channel is used to realize digital signal output, wherein: the high-side switch 10 is connected to the core controller 7 and driven by the core controller 7, and is used to output a PNP open-drain type digital signal; the low-side switch 11 is connected to the core controller 7 and driven by the core controller 7, and is used to output an NPN open-drain type digital signal, or cooperates with the high-side switch 10 to output a push-pull output type digital signal; the isolation combiner 14 is respectively connected to the high-side switch 10, the low-side switch 11 and the M12-5-core waterproof connector 16, and is used to combine the above-mentioned high-side switch 10 and the low-side switch 11 and output them to the outside through the M12-5-core waterproof connector 16; the signal output type of the digital channel can be configured as disabled, NPN open-drain, PNP open-drain and push-pull, and the digital channel output type configuration information is associated; the action logic of the digital channel can be configured as normally open and normally closed, and the digital channel action type configuration information is associated; the action mode of the digital channel can be configured as single point, window and hysteresis, and the digital channel action mode configuration information is associated, and the action threshold of the digital channel can be arbitrarily configured within the range, and the digital channel action threshold configuration information is associated.

[0044] The communication channel is used to realize IO-Link bus communication, wherein: the IO-Link interface circuit 12 is connected to the core controller 7 and driven by the core controller 7, and is used to realize bus communication with external IO-Link devices; the EMC network 15 is connected to the IO-Link interface circuit 12 and the M12-5-core waterproof connector 16, and is used to isolate and filter out the EMC interference coupled into the external IO-Link device through the IO-Link bus and output it to the outside through the M12-5-core waterproof connector 16;

[0045] The working status of the communication channel includes the communication status and the digital status. The communication channel takes the communication status as the first priority. The operation characteristics of the digital status of the communication channel are the same as those of the digital channel. The analog channel, digital channel and communication channel can be enabled, disabled or enabled separately at the same time.

[0046] In addition to being used for signal output in analog channels, digital channels and communication channels, the M12-5-core waterproof connector 16 is also used for main power input and is connected to a power isolation step-down circuit to step down the input main power for powering all circuits of the entire machine.

[0047] All configuration information can be viewed and adjusted remotely through the human-machine interaction module or IO-Link bus;

[0048] The housing 19 is made of 440C super-hard martensitic stainless steel with a thickness of 5.0 mm to achieve a static pressure resistance level of 1.5 MPa.

[0049] A micro through hole 17 is pre-designed on the upper surface of the shell 19, and an explosion-proof vent valve 20 is embedded in the micro through hole 17, and an IP69K waterproof and breathable membrane 18 is fixed on the outer wall side surface of the micro through hole 17, ensuring that the integrated micro air pressure sensor inside the core controller 7 can be effectively and reliably connected to the atmosphere while having an IP69K dust and water resistance level, and also ensuring that the explosion-proof performance is not affected.

[0050] The power isolation step-down circuit has the function of electrically isolating and limiting the input DC power supply; thereby realizing the transmission interaction and isolation and energy limiting of signals and power supplies between the safe side inside the closed flameproof enclosure and the dangerous side outside the flameproof enclosure.

[0051] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-channel programmable explosion-proof digital pressure sensor, characterized in that: It comprises a housing (19) and a human-machine interaction module for viewing current measurement values ​​and modifying configuration information to complete human-machine interaction, a collection module for collecting medium pressure signals, an auxiliary module, an analog channel for realizing analog signal output, a digital channel for realizing digital signal output, a communication channel for realizing IO-Link bus communication, an M12-5-core waterproof connector (16) for signal output in the analog channel, the digital channel and the communication channel and for main power input, a core controller (7) for electrical control, coordination and data operation functions of all parts of the whole machine, and a power isolation step-down circuit; The human-computer interaction module, the acquisition module, the auxiliary module, the analog channel, the digital channel and the communication channel are respectively connected to the core controller (7).

2. According to claim 1, a multi-channel programmable explosion-proof digital pressure sensor is characterized in that: The human-computer interaction module comprises an OLED display screen (1) for displaying real-time pressure values ​​and configuration information and a capacitive touch panel (2) for real-time acquisition of its touch status. The OLED display screen (1) and the capacitive touch panel (2) are respectively connected to a core controller (7).

3. According to claim 1, a multi-channel programmable explosion-proof digital pressure sensor is characterized in that: The acquisition module comprises an analog signal conditioning circuit (4) for conditioning a weak piezoelectric signal and transmitting the obtained pressure signal to a core control unit for sampling; the analog signal conditioning circuit (4) is connected to a piezoelectric pressure transmitter (3) for directly converting a medium pressure signal in a target pipeline into a weak piezoelectric signal and transmitting the signal to the core control unit; the analog signal conditioning circuit (4) and the core controller (7) are connected to each other.

4. According to claim 1, a multi-channel programmable explosion-proof digital pressure sensor is characterized in that: The auxiliary module comprises an F-RAM memory (5) for storing and reading configuration information and a precision voltage reference source (6) for providing a voltage reference source to a core controller (7); the F-RAM memory (5) and the core controller (7) are connected to each other, and the precision voltage reference source (6) and the core controller (7) are connected to each other.

5. According to claim 1, a multi-channel programmable explosion-proof digital pressure sensor is characterized in that: The analog channel comprises a precision current loop driver (8) for outputting an analog current signal, a precision voltage driver (9) for outputting an analog voltage signal, and an isolation combiner (13) for combining the analog precision current loop driver (8) and the precision voltage driver (9) and outputting the combined circuit to the outside through an M12-5 core waterproof connector (16). The precision current loop driver (8) and the precision voltage driver (9) are respectively connected to the core controller (7), and the isolation combiner (13) is respectively connected to the precision current loop driver (8), the precision voltage driver (9) and the M12-5 core waterproof connector (16).

6. According to claim 1, a multi-channel programmable explosion-proof digital pressure sensor is characterized in that: The digital channel comprises a high-side switch (10) for outputting a PNP open-drain type digital signal, a low-side switch (11) for outputting an NPN open-drain type digital signal, and an isolation combiner 2 (14) for combining the high-side switch (10) and the low-side switch (11) and outputting the signal to the outside through an M12-5-core waterproof connector (16); the high-side switch (10) and the low-side switch (11) are respectively connected to a core controller (7); and the isolation combiner 2 (14) is respectively connected to the high-side switch (10), the low-side switch (11) and the M12-5-core waterproof connector (16).

7. The multi-channel programmable explosion-proof digital pressure sensor according to claim 1, characterized in that: The communication channel comprises an IO-Link interface circuit (12), wherein the IO-Link interface circuit (12) and the core controller (7) are connected to each other, and the IO-Link interface circuit (12) and the M12-5 core waterproof connector (16) are connected to each other via an EMC network (15).

8. The multi-channel programmable explosion-proof digital pressure sensor according to claim 1, characterized in that: The thickness of the outer shell (19) is 5.0 mm, and the outer shell (19) is made of 440C super-hard martensitic stainless steel material.

9. The multi-channel programmable explosion-proof digital pressure sensor according to claim 1, characterized in that: The power isolation and voltage reduction circuit is connected to an M12-5 core waterproof connector (16) and is used to reduce the voltage of the input main power supply to supply power to all partial circuits of the whole machine.

10. The multi-channel programmable explosion-proof digital pressure sensor according to claim 1, characterized in that: The housing (19) is provided with a micro through hole (17), an explosion-proof vent valve (20) is arranged in the micro through hole (17), and a waterproof breathable membrane (18) is arranged at the end of the micro through hole (17).

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