A modular distributed temperature and flow measurement device

Abstract

The embodiment of the present invention discloses a modular distributed temperature and flow measurement device, which includes: a plurality of measurement modules that can communicate with each other in a network and are distributed at different monitoring points in a pipe network to be monitored, wherein the measurement modules can obtain multiple monitoring data of the monitoring points, and based on the corresponding data publishing / subscribing protocols, publish the obtained monitoring data to the communication network / subscribe to the monitoring data published by other measurement modules and integrate them into complete monitoring data and then feed them back to the control module; a communication module, wherein the communication module can provide a communication network; and a control module, wherein the control module can configure the corresponding data publishing / subscribing protocols for each measurement module on the communication network, and form the flow field distribution data of the pipe network to be monitored based on the monitoring data of each measurement module obtained. The present invention can measure multiple temperature measurement points and flow velocities at the same time, reduce the space used for measurement, and achieve the effect of flexible configuration of the measurement device.

Description

Technical Field

[0001] The invention relates to the technical field of industrial field measurement, and in particular to a modular distributed temperature and flow measurement device. Background Art

[0002] In the process of industrial production, it is often necessary to monitor the flow or heat of various fluids flowing through pipelines, but different industrial sites, or even different pipelines in the same site, often have very different measurement requirements, which are specifically reflected in the measurement accuracy, cost, space occupation, etc. At present, the measurement of industrial flow mainly adopts two types of instruments: electromagnetic flowmeter and ultrasonic flowmeter. Electromagnetic flowmeter occupies a large space, especially for small pipe diameters, and the cost is relatively high. Once it leaves the factory, the pipe diameter used is fixed, which is not conducive to reuse during production transformation. In contrast, ultrasonic flowmeter has the advantages of small pipe section volume, low cost, and easy installation, but the secondary instrument part also has the problem of occupying a large space. If higher measurement accuracy is required, it is mainly achieved by setting up multiple sound paths, but the number of sound paths is limited at the time of leaving the factory, and it is not suitable for local space. At this time, it is necessary to measure the flow or heat of more pipelines at the same time, especially if there are many types of pipe diameters and different measurement accuracy requirements, which will also lead to the need for flowmeters of different models and specifications to deal with them one by one.

[0003] Although ultrasonic flow meters can be used for measurement signal collection, the ultrasonic flow meters currently on the market mainly use RS485 communication interface. This half-duplex bus communication method with a single host and multiple slaves not only has slow communication speed and low efficiency, but also means that when data collection, monitoring or remote transmission is required at the industrial site, only one device can communicate directly with the instrument as the host, and other devices need to obtain measurement data through cascading and forwarding, which has poor scalability and flexibility. Summary of the invention

[0004] Based on this, in order to solve the deficiencies of the aforementioned prior art, a modular distributed temperature and flow measurement device is proposed.

[0005] A modular distributed temperature and flow measurement device, characterized by comprising:

[0006] Multiple measurement modules that can communicate with each other and are distributed at different monitoring points in the pipe network to be monitored. The measurement modules can obtain multiple monitoring data of the monitoring points, publish the obtained monitoring data to the communication network / subscribe to the monitoring data published by other measurement modules based on their corresponding data publishing / subscribing protocols, and integrate them into complete monitoring data and then feed them back to the control module;

[0007] A communication module, wherein the communication module is capable of providing a communication network;

[0008] And a control module, which can configure the corresponding data publishing / subscribing protocols for each measuring module on the communication network, and form the flow field distribution data of the pipe network to be monitored based on the monitoring data obtained from each measuring module.

[0009] Optionally, in one embodiment, each of the measurement modules includes a temperature detection circuit, a flow rate measurement circuit, a microcontroller circuit and a CAN communication interface circuit; wherein the temperature detection circuit collects the temperature data collected from the pipeline flowing through the monitoring point where it is located, converts it into time data, and transmits it to the microcontroller circuit; the flow rate measurement circuit collects the flow rate data of the fluid flowing through the pipeline where it is located, converts it into time data, and transmits it to the microcontroller circuit; the time data obtained by the microcontroller circuit is converted into corresponding flow rate data and temperature data, respectively, and after obtaining the monitoring value of the monitoring point, it is transmitted to the communication module via the CAN communication interface circuit to feedback the detection result to the control module.

[0010] Optionally, in one embodiment, the microcontroller circuit can also publish the acquired monitoring data to the communication network / subscribe to the monitoring data published by other measurement modules based on the data publish / subscribe protocol issued by the control module and integrate them into complete monitoring data and then feed them back to the control module.

[0011] Optionally, in one embodiment, the number of nodes n that the CAN communication interface circuit can access to the measurement module is calculated according to the following formula (1), where formula (1) is:

[0012]

[0013] Where: V diff —Transceiver differential input voltage, in V;

[0014] V diffout —Transceiver differential output voltage, in V;

[0015] R W — Bus cable resistance, unit: Ω;

[0016] R T —Terminal matching resistance, unit Ω;

[0017] R diff —Differential input resistance, in Ω.

[0018] Optionally, in one embodiment, the microcontroller circuit includes a CAN controller and an SPI interface, the CAN communication interface circuit includes a CAN transceiver, and the microcontroller circuit communicates with the flow rate measurement circuit and the temperature measurement circuit through the SPI interface.

[0019] Optionally, in one embodiment, the measurement module includes a plurality of temperature detection circuits and a plurality of flow rate measurement circuits to obtain temperature information and flow information in different monitoring directions at the same monitoring point; the monitoring points include but are not limited to different positions within the same pipeline.

[0020] Optionally, in one of the embodiments, the measurement module further includes a measurement address configuration unit, which is used to configure corresponding address information for each measurement module to distinguish the same data frames published by different measurement modules on the CAN bus.

[0021] Optionally, in one embodiment, the measurement address configuration unit includes a dip switch.

[0022] Optionally, in one embodiment, the control module includes a recording / display unit and a host computer, the recording / display unit is used to store and display the measurement information of each measurement module; the host computer is used to configure the corresponding data publishing / subscribing protocol for each measurement module on the communication network, and form the flow field distribution data of the pipeline network to be monitored based on the monitoring data obtained from each measurement module.

[0023] Implementing the embodiments of the present invention will have the following beneficial effects:

[0024] 1) The measurement module of the present invention can support the simultaneous measurement of 4-way flow rate and 4-way temperature through the hardware time-division multiplexing technology, and can be reconstructed and used in combination as needed to measure the fluid flow or heat in a single-channel or multi-channel pipeline;

[0025] 2) The present invention uses the CAN communication interface to fully utilize the high performance, high reliability, strong real-time performance, simple structure, and free communication between nodes of the CAN bus communication, thereby realizing the modularization and good expansibility of the measurement module, and enabling the measurement modules to communicate freely and efficiently;

[0026] 3) The measuring device described in the present invention can use a predefined publish / subscribe communication model (protocol) to enable the measurement values ​​obtained by each measurement module to be sent to other measurement devices on the CAN bus according to a preset configuration, and can also obtain the measurement values ​​published by other measurement modules from the CAN bus according to the preset configuration, so that the flow rate and temperature measurement functions between different measurement modules can be reconstructed and used in combination as needed, thereby realizing the reconstruction of the entire measurement network composed of multiple measurement modules. Only using one measurement module of this invention can easily cope with the measurement of flow or heat of fluids in various pipe diameters in complex pipe networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] in:

[0029] Figure 1 It is a schematic diagram of the topological structure of the present invention;

[0030] Figure 2 It is a diagram of the software and hardware hierarchy in the implementation process of the present invention;

[0031] Figure 3 It is a brief flow chart of software in the implementation process of the present invention;

[0032] Figure 4 It is a specific embodiment monitoring configuration diagram during the implementation of the present invention;

[0033] Figure 5 is a schematic block diagram of the measurement process after the measurement device of the present invention is reconstructed separately;

[0034] Figure 6 It is a schematic block diagram of the measurement process after the measurement device of the present invention is completely reconstructed.

[0035] Among them, 1. CAN bus, 2. Temperature probe; 3. Temperature; 4. Flow rate. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It is understood that the terms "first", "second", etc. used in the present invention can be used to describe various elements in this article, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first element can be referred to as the second element, and similarly, the second element can be the first element. Both the first element and the second element are elements, but they are not the same element.

[0038] In the pipeline flow field distribution measurement technology, the flow velocity of the fluid in the pipe diameter is generally measured by a flow meter, and the flow field distribution is obtained by the flow velocity; however, for a complex pipe network, the flow velocity at different positions is different. In order to ensure the accuracy of the measurement, multiple measuring devices need to be set up to obtain data to restore the flow field distribution; if the diameter of the measured pipe is small, a single measuring device can be used for measurement, but for a large-diameter pipe, the measurement error of a single measuring device is large, and it is necessary to measure the flow velocity at multiple points, and measure a flow velocity data at each point to restore the flow field distribution as accurately as possible; although there are multi-path measurement devices in the prior art, they have certain limitations. They can only measure the flow at one position or the flow value or heat value of the same pipe. For complex pipelines, multiple measuring devices need to be configured, but if the maximum measurement circuit of the measuring device (used to measure the flow velocity at each point) is N, but the monitoring point only needs M, and N is greater than M, then there may be a certain amount of idle circuits at each monitoring point. Since the price of multi-path measurement equipment is generally more expensive, the existence of idle circuits in multiple places will cause certain configuration waste and other problems.

[0039] Based on the above problems, in this embodiment, Figure 1-3 As shown, a modular distributed temperature flow measurement device is characterized by comprising:

[0040] Multiple measurement modules that can communicate with each other and are distributed at different monitoring points in the pipe network to be monitored. The measurement modules can obtain multiple monitoring data of the monitoring points, publish the obtained monitoring data to the communication network / subscribe to the monitoring data published by other measurement modules based on their corresponding data publishing / subscribing protocols, and integrate them into complete monitoring data and then feed them back to the control module;

[0041] A communication module, wherein the communication module is capable of providing a communication network;

[0042] And a control module, which can configure the corresponding data publishing / subscribing protocols for each measuring module on the communication network, and form the flow field distribution data of the pipe network to be monitored based on the monitoring data obtained from each measuring module.

[0043] Based on the above, it can be known that the present invention can realize the measurement process of the flow rate or heat of fluids in various pipe diameters of complex pipe networks through the mutual cooperation of the functions designed by the measurement module, the communication module and the control module. The flow rate and temperature measurement functions between different measurement modules can be reconstructed on demand and freely applied and combined for split use (effectively changing the existing equipment using a fixed combination form, resulting in problems such as idle sound paths. In this case, each measurement module can measure 4-way flow rates, can be disassembled and used in real time, and each measurement module can communicate in real time). Then, through the reconstruction of the entire measurement network composed of multiple measurement modules, it is possible to measure multiple temperature measurement points and flow rates at the same time, thereby reducing the space used for measurement. At the same time, given that there is no need for communication between instruments in the prior art, However, this case requires real-time data exchange and other communication behaviors, so the CAN communication interface and other interfaces are used to achieve flexible expansion and installation on demand. It is particularly suitable for complex pipe networks with many points of flow and heat to be measured. It can realize free communication between modules. For example, the current pipeline includes adjacent pipes 1 and 2. Pipeline 1 needs to be monitored in 6 channels, and pipe 2 has a small diameter and only needs two channels of monitoring. In order to accurately measure the flow field distribution, it is generally necessary to set two measurement modules in pipe 1 and one measurement module in pipe 2 in the prior art, with a total of 12 measurement circuits, resulting in 4 idle circuits. However, the present invention only requires two measurement modules for free combination communication applications to achieve measurement. One of the measurement modules can obtain the measured flow rate by communicating with another measurement module based on the corresponding data publish / subscribe protocol, thereby achieving combined and split measurements within the module as required.

[0044] In some specific embodiments, each of the measurement modules includes a temperature detection circuit, a flow rate measurement circuit, a microcontroller circuit and a CAN communication interface circuit; wherein the temperature detection circuit collects the temperature data of the pipeline flowing through the monitoring point where it is located, converts it into time data and transmits it to the microcontroller circuit; the flow rate measurement circuit collects the flow rate data of the fluid flowing through the pipeline at the monitoring point where it is located, converts it into time data and transmits it to the microcontroller circuit; the time data obtained by the microcontroller circuit is converted into corresponding flow rate data and temperature data respectively, and after obtaining the monitoring value of the monitoring point, it is transmitted to the communication module via the CAN communication interface circuit to feedback the detection result to the control module.

[0045] In some more specific embodiments, the temperature detection circuit is used in conjunction with an external platinum resistor to convert temperature data into time data and transmit it to a microcontroller circuit; the flow rate measurement circuit is used in conjunction with an external ultrasonic transducer to convert the flow rate of the fluid into time data and transmit it to a microcontroller circuit; the microcontroller circuit communicates with the flow rate measurement circuit and the temperature measurement circuit through an SPI interface, and converts the obtained time data into corresponding flow rate data and temperature data, respectively, and then calculates the corresponding flow value or calorific value, and then sends it out through the CAN communication interface circuit for subsequent processing by other measuring devices or acquisition devices on the same CAN bus. In some specific embodiments, such as Figure 1 As shown, each of the measuring modules can use up to 4 platinum resistors (such as PT1000) and 4 sets of ultrasonic transducers (typical frequency 1MHz) to measure 4-way temperature and 4-way flow rate at the same time, and can flexibly expand the corresponding number of modules according to the total number of temperatures and flow rates actually measured on site. It is only necessary to set the device address of each measuring module through the DIP switch to distinguish the same data frames published by different measuring modules on the CAN bus. When installing platinum resistors and ultrasonic transducers, they can be flexibly combined and configured according to actual needs. For example, the temperature of one point and the flow rate of one section can be measured in each pipeline, as shown in pipeline 1; the temperature of two points and the flow rate of two sections can be measured in each pipeline to improve the measurement accuracy and reliability, as shown in pipeline 2; the temperature can be measured alone, as shown in temperature measurement point 1; the flow rate can be measured alone, as shown in pipeline 3; the measurement channels of multiple measuring modules can be combined together to measure the temperature of multiple points and the flow rate of multiple sections of the same pipeline together. When the pipe diameter is large, higher measurement accuracy and reliability can be obtained, as shown in pipeline 4. In addition, the CAN bus in the figure is marked with number 1, the temperature probe of the sensor is marked with number 2, and the flow rate and temperature characteristics in the pipeline are schematically marked with numbers 3 and 4.

[0046] In some more specific embodiments, the microcontroller circuit includes a CAN controller and an SPI interface, the CAN communication interface circuit includes a CAN transceiver, and the microcontroller circuit communicates with the flow rate measurement circuit and the temperature measurement circuit through the SPI interface; the microcontroller circuit MCU preferably uses an STM32 single-chip microcomputer. Preferably, the CAN transceiver (CAN communication interface circuit) used in the present invention preferably supports a maximum number of nodes of 110, a transmission baud rate of 40kbps-1Mbps, and when the corresponding communication cable and terminal resistor are selected, the maximum communication distance between any two nodes can reach more than 1000 meters. It is recommended to use a shielded twisted pair, and the shielding layer is single-point grounded to enhance the anti-interference of the bus. In practice, for the size limitation of the present invention, the measurement module is preferably equipped with a dip switch, which can be used to quickly set the address of the module to between 1 and 15 when the number of measurement modules on the same CAN bus is less than 15, which can meet most application requirements. If more than 15 modules need to be used at the same time, the DIP switch can be set to 0 to set the address of the measurement module using software, and the address of the measurement module can be set between 1 and 255 through the CAN interface. However, it should be noted that the total number of measurement modules on the same CAN bus cannot exceed 110. In addition, the characteristics of the CAN bus can be used to configure different address values ​​for each measurement device to give it different CAN communication transmission priorities. The smaller the address, the higher the priority.

[0047] In some specific embodiments, the microcontroller circuit can also publish the acquired monitoring data to the communication network / subscribe to the monitoring data published by other measurement modules based on the data publish / subscribe protocol issued by the control module and integrate them into complete monitoring data and then feed them back to the control module. When the communication starts to be established, the publish / subscribe communication protocol determines which communication nodes exist in the network, and configures the corresponding data publishing rules and data subscription rules for each communication node before the communication is established (that is, which data to publish, and which data to subscribe to from other measurement modules at the same time, so as to filter the data according to its own needs and obtain the data of interest, that is, the subscribed data, on the channel).

[0048] In some specific embodiments, the number of nodes n that the CAN communication interface circuit (CAN bus communication) can access to the measurement module is calculated according to the following formula (1), where:

[0049]

[0050] Where: V diff —Transceiver differential input voltage, in V;

[0051] V diffout—Transceiver differential output voltage, in V;

[0052] R W — Bus cable resistance, in Ω; and the maximum bus length based on the bus cable specification;

[0053] R T —Terminal matching resistance, unit Ω;

[0054] R diff —Differential input resistance, in Ω.

[0055] R W — Bus cable resistance, unit Ω, according to;

[0056] R T —Terminal matching resistance, unit Ω;

[0057] R diff —Differential input resistance, unit Ω;

[0058] n—number of nodes.

[0059] In some specific embodiments, the measurement module includes several temperature detection circuits and several flow rate measurement circuits to obtain temperature information and flow information in different monitoring directions at the same monitoring point; the monitoring points include but are not limited to different positions in the same pipeline.

[0060] In some specific embodiments, the measurement module also includes a measurement address configuration unit, which is used to configure corresponding address information for each measurement module / temperature detection circuit and / or flow rate measurement circuit in the measurement module to distinguish the same data frames published by different measurement modules on the CAN bus, that is, to configure a data communication address identification code for the data frame corresponding to each monitoring point; the measurement address configuration unit includes a dip switch to facilitate the configuration and detection of the device address corresponding to the measurement module.

[0061] In some specific embodiments, the control module includes a recording / display / calculation unit and a host computer, the recording / display / calculation unit is used to store and display the measurement information of each measurement module; the host computer is used to configure the corresponding data publishing / subscription protocol for each measurement module on the communication network, and form the flow field distribution data of the pipe network to be monitored based on the monitoring data of each measurement module obtained. The host computer is connected to the communication module through a USB to CAN adapter, and the communication module at least includes a communication gateway, preferably a wireless communication gateway.

[0062] In some specific embodiments, Figure 4As shown, the measurement module 1 can be configured to monitor one flow rate measurement circuit and one temperature measurement circuit of pipeline 1; and simultaneously monitor two flow rate measurement circuits and two temperature measurement circuits of pipeline 2; the measurement module 2 can be configured as a separate temperature measuring probe, one flow rate measurement circuit of pipeline 3, and three flow rate measurement circuits and two temperature measurement circuits of pipeline 4; and the other sound path data of pipeline 4 are monitored by subsequent measurement modules;

[0063] Based on the above design scheme, this example specifically provides a classic hardware and software basic hierarchical structure applicable to the present invention. From the functional architecture point of view, Figure 2 As shown, from bottom to top, they are the sensor layer, the measurement module layer, and the extension module layer.

[0064] The sensor layer includes at least two types of sensors, namely, a platinum resistor (such as PT1000) for temperature measurement and an ultrasonic transducer (typically with a frequency of 1 MHz) for flow velocity measurement.

[0065] Among them, the measurement module can be divided into a hardware layer, a driver layer, an interface layer, a logic mapping layer, and a data calculation layer; the hardware layer, in addition to the multi-channel temperature detection circuit and the multi-channel flow rate measurement circuit assigned to the sensor layer, mainly includes a microcontroller circuit and a power supply circuit; the driver layer is used to provide a driver for the hardware layer, so as to provide an interface function for calling the measurement layer, namely the measurement program (an embedded program for realizing multi-channel temperature and flow rate measurement) and the program of the interface layer (an embedded program for realizing communication between the measurement module and other modules on the CAN bus above the driver layer); the logic mapping layer is used to map and combine the measurement results of the measurement module provided by the measurement layer according to the logic mapping structure configured by the user in the logic mapping layer (used to identify which flow rate and temperature measurement values ​​belong to the same logical calculation relationship, and then cooperate to complete the calculation of flow or heat), and then provide them to the data calculation layer, so as to complete the calculation of related data values ​​(specifically calculated according to the installation conditions of each sound path and the flow field distribution characteristics); the data calculation layer mainly realizes the use of the corresponding publish / subscribe communication protocol according to the configuration of the original measurement data provided by the logic mapping layer to obtain the flow or heat value. Except for the hardware layer, the other layers are embedded programs running inside the microcontroller, among which the interface layer interacts with the measurement layer, the logic mapping layer and the data calculation layer to realize the parameter configuration of the device, the acquisition and release of measurement data and other tasks. Figure 5 As shown, process ① is the 4-way temperature value and 4-way flow rate value obtained by initial measurement; process ②-③ is to recombine the temperature value and flow rate value obtained by process ① according to the preset logical mapping relationship (structure); process ④ is to calculate the recombined temperature value and flow rate value respectively to obtain the corresponding heat value, temperature measurement value, flow value, etc. Figure 6As shown, process ① is the 4-channel temperature values ​​and 4-channel flow rate values ​​obtained by initial measurement; process ②-③ is to publish the corresponding measurement values ​​to the CAN bus according to the preset data publishing configuration protocol; process ④-⑤ is to obtain the corresponding measurement values ​​published by other measuring devices from the CAN bus according to the preset subscription data configuration; process ⑥ is to recombine the previously obtained temperature values ​​and flow rate values ​​that need to be involved in further calculation according to the preset logical mapping relationship (structure); process ⑦ is to calculate the recombined temperature values ​​and flow rate values ​​respectively to obtain the corresponding heat value, flow value, etc.; the "temperature 1-2" shown in the figure represents the second temperature measurement of the measuring device with the number (address) 1, and the others are similar.

[0066] like Figure 3 The figure shows a brief flow chart of the program of the measurement module. The program starts running after the measurement module is powered on. First, the initialization of various relevant parameters is completed. The relevant parameters mainly include various configuration information. The measurement module needs to be set up before use, and then it starts to execute two tasks in parallel, namely temperature measurement and flow rate measurement tasks, as well as the publishing and acquisition tasks of repeated measurement of temperature / flow rate data. After obtaining the measured data, it is first checked and judged. If there is an abnormality (the measured value is obviously unreasonable, or the mutation is large, and there is a special value defined to indicate a measurement error), it enters the data abnormality processing link, otherwise the relevant flow or heat is calculated, the CAN communication signal communication address corresponding to the pipeline is obtained, and then the calculation result is published to complete a measurement cycle.

[0067] Among them, the expansion module layer can realize data recording, display, and calculation according to different industrial site requirements, and can also realize various expansion functions such as data remote transmission, measurement system configuration, operation monitoring, maintenance management, etc. in combination with the communication gateway. Preferably, a single expansion module can realize multiple of the above functions, and multiple expansion modules can realize different functions respectively. It is only necessary to connect the CAN communication interface of each expansion module to the CAN bus of the measurement module, and send or parse data according to the set communication protocol.

[0068] In summary, based on the time difference method flow velocity measurement and temperature measurement method, the present invention uses hardware time-division multiplexing to enable a single measuring device to support simultaneous measurement of up to 4 flow velocities and 4 temperatures, and can be reconstructed and used in combination as needed for measuring the flow rate or heat of fluid in a single-channel or multi-channel pipeline; at the same time, the CAN communication interface is applied to the flow measurement device, and the high performance, high reliability, strong real-time performance, simple structure, and free communication between nodes of the CAN bus communication are fully utilized to achieve modularization and good scalability of the measurement device, and each measuring device can also communicate freely and efficiently; on the basis of the above beneficial effects, the measurement module is provided with a publish / subscribe communication protocol, and each measurement value can be sent to other measurement modules on the CAN bus according to a preset configuration, and the measurement values ​​of other measurement modules can also be obtained from the CAN bus according to the preset configuration, so that the flow rate and temperature measurement functions between different measurement modules can be reconstructed and used in combination as needed, so as to achieve the reconstruction of the entire measurement network composed of multiple measurement devices, and easily cope with the flow rate or heat measurement of fluids in various pipe diameters in a complex pipe network. In addition, the measurement modules of the present invention have the same function and status in the entire measurement network. The measurement data and calculation results of all devices can be published on the CAN bus according to preset configurations for acquisition and use by other measurement devices, acquisition terminals, communication gateways, and monitoring equipment, thus achieving true distributed measurement and communication, thereby improving the flexibility and scalability of industrial field applications and the convenience of subsequent maintenance and upgrades.

[0069] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A modular distributed temperature and flow measurement device, characterized in that: include: Multiple measurement modules that can communicate with each other and are distributed at different monitoring points in the pipe network to be monitored. The measurement modules can obtain multiple monitoring data of the monitoring points, publish the obtained monitoring data to the communication network / subscribe to the monitoring data published by other measurement modules based on their corresponding data publishing / subscribing protocols, and integrate them into complete monitoring data and then feed them back to the control module; A communication module, wherein the communication module is capable of providing a communication network; and a control module, which can configure the corresponding data publishing / subscribing protocols for each measuring module on the communication network, and form the flow field distribution data of the pipe network to be monitored based on the monitoring data obtained from each measuring module; Each of the measurement modules includes a temperature detection circuit, a flow rate measurement circuit, a microcontroller circuit and a CAN communication interface circuit; wherein the temperature detection circuit collects temperature data of the pipeline fluid flowing through the monitoring point where it is located and converts it into time data, which is then transmitted to the microcontroller circuit; the flow rate measurement circuit collects flow rate data of the pipeline fluid flowing through the monitoring point where it is located and converts it into time data, which is then transmitted to the microcontroller circuit; the time data obtained by the microcontroller circuit is respectively converted into corresponding flow rate data and temperature data, and after obtaining the monitoring value of the monitoring point, it is transmitted to the communication module via the CAN communication interface circuit, so as to feed back the detection result to the control module; and the flow rate and temperature measurement functions between different measurement modules are reconstructed and used in combination as needed; The microcontroller circuit can also publish the acquired monitoring data to the communication network / subscribe to the monitoring data published by other measurement modules based on the data publishing / subscribing protocol issued by the control module and integrate the complete monitoring data into the complete monitoring data and then feed it back to the control module; The measurement module also includes a measurement address configuration unit, which is used to configure corresponding address information for each measurement module to distinguish the same data frames published by different measurement modules on the CAN bus.

2. The modular distributed temperature and flow measurement device according to claim 1, characterized in that: The number of nodes n that the CAN communication interface circuit can access to the measurement module is calculated according to the following formula (1), where: Where: V diff —Transceiver differential input voltage, in V; V diffout —Transceiver differential output voltage, in V; R W — Bus cable resistance, unit: Ω; R T —Terminal matching resistance, unit Ω; R diff —Differential input resistance, in Ω.

3. The modular distributed temperature and flow measurement device according to claim 1, characterized in that: The microcontroller circuit includes a CAN controller and an SPI interface, the CAN communication interface circuit includes a CAN transceiver, and the microcontroller circuit communicates with the flow rate measurement circuit and the temperature measurement circuit through the SPI interface.

4. The modular distributed temperature and flow measurement device according to claim 1, characterized in that: The measuring module includes a plurality of temperature detection circuits and a plurality of flow rate measurement circuits to obtain temperature information and flow information in different monitoring directions at the same monitoring point; the monitoring points include but are not limited to different positions in the same pipeline.

5. The modular distributed temperature and flow measurement device according to claim 1, characterized in that: The measurement address configuration unit includes a dip switch.

6. The modular distributed temperature and flow measurement device according to claim 1, characterized in that: The control module includes a recording and display unit and a host computer. The recording and display unit is used to store and display the measurement information of each measurement module; the host computer is used to configure the corresponding data publishing / subscribing protocol for each measurement module on the communication network, and form the flow field distribution data of the pipeline network to be monitored based on the monitoring data obtained from each measurement module.

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