CN214583742U - Household heat meter capable of adjusting flow - Google Patents
Household heat meter capable of adjusting flow Download PDFInfo
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- CN214583742U CN214583742U CN202120299641.7U CN202120299641U CN214583742U CN 214583742 U CN214583742 U CN 214583742U CN 202120299641 U CN202120299641 U CN 202120299641U CN 214583742 U CN214583742 U CN 214583742U
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Abstract
The utility model relates to a but household of flow regulation is with calorimeter, pipeline flow collection module is used for gathering heat supply pipeline's heat-carrying liquid flow, pipeline temperature collection module is used for gathering heat supply pipeline's heat-carrying liquid temperature, the CPU main module is used for storing heat-carrying liquid flow and heat-carrying liquid temperature and calculates the heat that heat-carrying liquid released, keyboard and display module are used for parameter setting, power and calorimeter state indication, show temperature/flow and heat, current output module is used for exporting the not electric current of equidimension, control electrical control valve's aperture, radio frequency transmission module is used for transmitting temperature/flow and heat to intelligent control center with the non-contact mode, switching power supply module is used for providing working power supply for the calorimeter. The utility model discloses a non-contact wireless data transmission utilizes the remote transmission of GPS technique realization data, accomplishes the family and uses calorimeter correlation data acquisition, masters in real time and remote transmission, the steerable flow that carries heat liquid simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the heat supply measurement, concretely relates to but calorimeter is used at family of adjustable flow.
Background
In the field of heat supply, a household heat meter is a product for measuring the heating load of a household user, and consists of a flow sensor, a microprocessor and a paired temperature sensor. The microprocessor obtains flow signals through the flow sensor, obtains water temperature signals of the inlet and the outlet from the temperature measuring circuit, and calculates the heat released by the heat-carrying liquid according to a standard heat calculation formula.
In the conventional household heat meter, a user can only know the household heat supply condition by closely observing the number displayed by the heat meter, cannot remotely or timely master the household heat supply condition, and cannot adapt to the requirements of modern intelligent household life; in addition, when the indoor temperature is too high or too low, the user can not realize the adjustment of the heat supply pipeline heat-carrying liquid flow.
Disclosure of Invention
In order to solve the technical problem, the utility model discloses a radio frequency wireless transmission technique and current control technique realize the non-contact collection and the teletransmission of family's heat supply information and to the regulation of heat supply pipeline heat-carrying liquid flow. The utility model discloses the technical scheme who adopts as follows:
a household adjustable flow rate heat meter comprising: the main CPU module is respectively connected with the switching power supply module, the radio frequency transmission module, the keyboard and display module, the current output module, the pipeline flow acquisition module and the pipeline temperature acquisition module, and the current output module is connected with an electric regulating valve arranged on a heat supply pipeline. The intelligent heat supply system comprises a pipeline flow collection module, a pipeline temperature collection module, a CPU main module, a keyboard and a display module, wherein the pipeline flow collection module is used for collecting heat-carrying liquid flow of a heat supply pipeline, the pipeline temperature collection module is used for collecting heat-carrying liquid temperature of the heat supply pipeline, the CPU main module is used for storing the heat-carrying liquid flow and the heat-carrying liquid temperature and calculating heat released by the heat-carrying liquid, the keyboard and the display module are used for setting parameters, indicating the states of a power supply and a heat meter and displaying the temperature/flow and the heat, a current output module is used for outputting currents with different sizes and further controlling the opening degree of an electric adjusting valve to automatically adjust the heat-carrying liquid flow of the heat supply pipeline, a radio frequency transmission module is used for transmitting the temperature/flow and the heat to an intelligent control center in a non-contact mode, and a switching power supply module is used for providing a working power supply for the heat meter. Intelligent control centers in the home are state of the art, such as: ZNPDXX-III wisdom house intelligent distribution box.
The utility model has the advantages that:
the utility model adopts the wireless radio frequency transmission technology and the current control technology, solves the non-contact wireless data transmission between the heat meter and the intelligent control center, and then realizes the remote transmission of data by the intelligent control center through the GPS technology, and completes the related data acquisition, real-time mastering and remote transmission of the heat meter for the user; meanwhile, the flow of the heat-carrying liquid of the heat supply pipeline is adjusted by controlling the current signal. The user can remotely know the temperature condition at home outdoors by communicating with the intelligent control center through the mobile phone; the temperature in the house can also be adjusted remotely: when no person is at home, the heat supply flow can be reduced; when the user goes home, the heat supply flow can be increased in advance to improve the temperature of the room, so that the aim of saving energy is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are illustrative of some embodiments of the invention, and that those skilled in the art will be able to derive other drawings without inventive step from these drawings, which are within the scope of the present application.
Fig. 1 is a schematic structural diagram of a household heat meter capable of adjusting flow rate according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of the pipeline flow collecting module according to the embodiment of the present invention;
fig. 3 is a schematic circuit diagram of the pipeline temperature acquisition module according to the embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a CPU main module according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a keyboard and a display module according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a radio frequency transmission module according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a switching power supply module according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a current output module according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a household calorimeter capable of adjusting flow rate according to an embodiment of the present invention. A household adjustable flow rate heat meter comprising: the main CPU module is respectively connected with the switching power supply module, the radio frequency transmission module, the keyboard and display module, the current output module, the pipeline flow acquisition module and the pipeline temperature acquisition module, and the current output module is connected with an electric regulating valve arranged on a heat supply pipeline. The CPU main module is a core part of the whole heat meter and comprises: the device comprises a data interface, an analog interface, a communication interface, an interrupt interface and a serial port data interface; the switch power supply module provides 3.3V direct-current power supply for the whole heat meter, the keyboard and the display module are connected with a data interface of the CPU main module through an I/O interface, the radio frequency transmission module is connected with a communication interface of the CPU main module through a serial port signal line, the pipeline flow acquisition module is connected with the data interface and an interrupt interface of the CPU main module, the pipeline temperature acquisition module is connected with an analog interface of the CPU main module, and the current output module is connected with a serial port data interface of the CPU main module.
Pipeline flow collection module be used for gathering heat supply pipeline's heat-carrying liquid flow, include: pipeline flow acquisition circuit and two ultrasonic sensor. As shown in fig. 2, it is a schematic diagram of a circuit structure of the pipeline flow collecting module according to the embodiment of the present invention. H3 is a single-row connector of an input interface of an ultrasonic sensor, and is externally connected with two ultrasonic sensors for measuring the flow of heat-carrying liquid; r24 and R25 are current limiting resistors of the two ultrasonic sensor emission control interfaces, and C35 and C36 are blocking capacitors of the two ultrasonic sensor reflection loops. The pipeline flow acquisition module acquires the emission and return signals of the two ultrasonic sensors so as to measure the heat-carrying liquid flow of the heat supply pipeline. The ultrasonic sensor is arranged on the outer wall of the heat supply pipeline, measures the flow of the heat-carrying liquid by detecting the influence of the fluid flow on ultrasonic waves, and adopts a time difference method. Firstly, a sensor 1 is used for transmitting signals, and the signals penetrate through a pipe wall 1, fluid and a pipe wall 2 and are received by a sensor 2 on the other side; the sensor 2 sends out the same signal while the sensor 1 sends out the signal, is received by the sensor 1 after passing through the pipe wall 2, the fluid, the pipe wall 1; because the two times are different due to the existence of the flow velocity of the heat-carrying liquid, and a time difference exists, the flow velocity can be obtained according to the time difference, and further, the flow value is obtained, and the whole calculation is completed by the CPU main module. The single-row linker H3 is an input interface for two ultrasonic sensors, and the transmission signal and the reception signal of each ultrasonic sensor are completed by a single line.
Pipeline temperature acquisition module be used for gathering the heat-carrying liquid temperature of heat supply pipeline water inlet and delivery port, include: the pipeline temperature acquisition circuit and two PT1000 thermal resistors are respectively arranged at the water inlet and the water outlet of the heat supply pipeline. As shown in fig. 3, it is a schematic diagram of a circuit structure of the pipeline temperature collecting module according to the embodiment of the present invention. H4 is a PT1000 thermal resistor input interface single-row connector, and is externally connected with two thermal resistors for temperature measurement input; r26 is the grounding resistance of the thermal resistance sampling circuit, and forms a voltage division circuit with the PT1000 thermal resistance to acquire the resistance value relative to the temperature change. C37 is the filter capacitance of the analog input signal.
The main CPU module is used for storing the flow and the temperature of the heat-carrying liquid and calculating the heat released by the heat-carrying liquid, and comprises: CPU main circuit structure and DSPIC33F microprocessor, DSPIC33F is MICROCHIP series high performance 16 digit digital signal processor, is 16 digit MCU embedded application ideal device, it has wide working range temperature, improved Harvard structure, multi-interrupt level fast response, large capacity on-chip data memory, multifunctional communication module etc. advantages.
Fig. 4 is a schematic diagram of a circuit structure of the CPU main module according to an embodiment of the present invention. U1 is the main chip DSPIC 33F; c1, C2, R1 and Y1 form a crystal oscillator circuit, and U2 and R2 form a power-on reset circuit; u3 is data memory, can keep storing the data in the state of power down, C3 is the filter capacitance of its voltage port, R3, R4 are the pull-up resistance of the data interface; the H1 connector is a programming and debugging interface of the U1 chip; c4, C5, C6 and C7 are power interface filter capacitors of the U1 chip; c8 and C9 are analog power interface filter capacitors of the U1 chip; the L1 and L2 provide the internal AVDD power supply voltage for the U1 chip.
The main port of the DSPIC33F chip uses the functions: p36, P37 are data interfaces of the data memory; p11, P12, P13, P14, P17 and P18 are analog data interfaces and input interfaces for PT1000 thermal resistance temperature measurement; p33 and P34 are serial data interfaces connected with the radio frequency transmission chip; p47 and P48 are programming and debugging interfaces; p7 is a power-on reset interface; p39 and P40 are crystal oscillator clock input ports; p42, P43, P44 and P45 are ultrasonic data acquisition interfaces; p1, P2, P3 and P64 are key value input interfaces of the keyboard; p29 and P30 are LED indicator lamp control interfaces; p46, P49, P50, P51, P52, P53, P54 and P55 are data interfaces of the liquid crystal display, and P23, P24, P27 and P28 are control command interfaces of the liquid crystal display; p9, P25 and P41 are the grounding ends of the chip power supply, P15 is the grounding end of the chip analog power supply, and P20 is the grounding end of the chip internal power supply; p10, P26, P38, P56 and P57 are power interfaces of the chip, P16 is an analog power interface of the chip, and P19 is an internal power interface of the chip.
The keyboard and the display module are used for setting parameters, indicating the states of the power supply and the heat meter and displaying temperature/flow and heat, and are schematic circuit structure diagrams of the keyboard and the display module in the embodiment of the utility model as shown in fig. 5. The method comprises the following steps: the keyboard comprises a four-keyboard input circuit, an LED lamp indicating circuit and a liquid crystal display circuit. K1, K2, K3, K4 make up four keyboard input circuits, R20, R21, R22, R23 are the pull-up resistance of the key value input interface, the function is to provide the high level for the interface, there is the low level when the key is pressed, the key value is valid; and at the same time for the setting of the relevant parameters. The LED lamp indicating circuit consists of 2 groups of LED lamp driving circuits, and D3 and D4 are LED light-emitting tubes; r14 and R16 are respectively current-limiting resistors of the LED, and Q1 and Q2 are PNP triodes and control the on-off of the LED; r13 and R15 are driving current limiting resistors of the PNP triode. The liquid crystal display circuit displays related temperature, flow and heat, and U9 is a liquid crystal display interface; r17 is pull-up resistor selected by interface mode of LCD to provide high level for interface; c29 and R18 form a power-on reset circuit; r19 and Q3 are backlight control circuits of the liquid crystal display.
The radio frequency transmission module is used for transmitting the temperature/flow and the heat to the intelligent control center in a non-contact mode, and comprises: the CC2530 is an integrated chip developed by TI company and specially used for data transmission in a wireless sensor network, can be used for SoC solution applied to 2.4GHz IEEE802.15.4, ZigBee and RF4E to complete the sending and receiving of 2.4GHz IEEE802.15.4 data and realize the data exchange between a user heat meter and an intelligent control center and the execution of control commands.
As shown in fig. 6, it is a schematic diagram of a circuit structure of the rf transmission module according to an embodiment of the present invention. U4 is a CC2530 radio frequency data transmission chip, and C14, C15, C16, C17, C18, C19, C20 and C21 are respectively filter capacitors of each voltage port of the chip; the R5 and the C10 form a power-on reset circuit of the chip; r6 and C11 are respectively a grounding resistor and a capacitor of a chip port; y2 is a crystal oscillator of the chip internal clock, C12 and C13 are grounding capacitors of the crystal oscillator, and VL3 is a power inductor. C32 is a filter capacitor; c33 and C34 are blocking capacitors, the size of the transmitting power is determined by the parameters of C30, C31, L5 and L6, and the distance of the transmitting distance can be determined by adjusting different parameters of the capacitors and the inductors; ANI1 is a PCB printed board transmit antenna.
The main port usage functions of the CC2530 chip: the chip grounding ends of P1, P2, P3 and P4; power interfaces P10, P39, P21, P24, P27, P28, P29 and P31; p20 is the chip power-on reset interface; p25 and P26 are radio frequency emission output ports; p22 and P23 are crystal oscillator clock input ports; p16 and P17 are serial data interfaces connected to the DSPIC33F main chip.
The switching power supply module is used for providing a working power supply for the heat meter, converting alternating current 220V voltage of commercial power into direct current 3V3 voltage required by the heat meter, and completely isolating the alternating current electrically, so that the aim of safe use is fulfilled. As shown in fig. 7, it is a schematic circuit structure diagram of the switching power supply module according to the embodiment of the present invention. U5 is a diode rectifier bridge and is used for converting input alternating voltage into direct voltage, and C22 is a rectified filter capacitor; u6 is a special low-power switch power supply conversion chip, and C23 is a filter capacitor at a feedback control end; u7 is the feedback control end isolation signal input, C24 and Y3 are chip input filter capacitors; r7 is a chip one end grounding resistor; r8, C25 and D1 form a current-limiting filter circuit; t1 is power transformer; d2 and C26 are output rectifying and filtering circuits; r9, C27 and U8 are feedback control isolation circuits; r10, R11 are sampling reference points of the feedback circuit; l4 is a voltage output power inductor; r12 and C28 are direct-current voltage output protection and filter circuits, and H2 is an alternating-current voltage input interface.
The current output module is used for outputting currents of different sizes and further controlling the opening degree of the electric regulating valve to automatically regulate the flow of heat-carrying liquid of the heat supply pipeline, serial data is converted into voltage signals by adopting a TLC5615 chip, and the voltage signals are modulated into control current signals of 4-20mA through the LM2903 operational amplifier.
As shown in fig. 8, it is a schematic diagram of a circuit structure of the current output module according to the embodiment of the present invention. U13 is a 24V power converter, and can convert the 220V AC power supply into isolated DC 24V power supply, and C37 and C38 are power filter capacitors; u10 is D/A conversion chip, which converts serial data signal into 0-5V analog voltage signal, C35 is its power filter capacitor, U12 provides internal reference voltage for chip, R24 is its current limiting resistor; the operational amplifier U11 and Q4 form a V/I conversion and constant current generation circuit of 4-20mA current output, R25 and W1 form an amplification adjustment circuit of the operational amplifier, R25 is a comparison resistor and adjusts W1 to achieve the purpose of adjusting the amplification factor, C36 is a power supply filter capacitor of the operational amplifier, Q4 is a current output power transistor, and R26 is a constant current output reference standard resistor; h5 is a single-row connector of a current output interface, which is used for connecting an electric regulating valve.
The electric regulating valve can adopt a flow electric regulating valve, such as: AOX series electric single-seat regulating valves manufactured by aoxiang autonomous technologies ltd, zhejiang; or flow butterfly valve regulators are used, such as: AOX series electric center line butterfly valve produced by Ohang auto-control science and technology Limited of Zhejiang. The flow electric regulating valve or the flow butterfly valve regulator is powered by an independent power supply, can be supplied by alternating current 220V or direct current 24V, is arranged in a heat supply pipeline needing to be regulated and controlled, and is regulated by 4-20mA current signals output by the current output module.
The embodiment of the utility model provides an adopt DSPIC33F microprocessor and TLC5615 chip, CC2530 chip, compromise the performance and the economic cost of calorimeter, specific higher price/performance ratio.
The household heat meter with adjustable flow rate of the embodiment of the utility model can visually display on the display screen of the intelligent control center, so that the user can know the actual heat supply condition at any time; the heat meter data collected in real time can be processed, analyzed and stored, and is transmitted to a remote control center through the GPRS technology, so that data support is provided for large data processing in the aspect of heat supply; meanwhile, the flow of the heat-carrying liquid of the heat supply pipeline is adjusted by controlling the current signal.
Finally, it is to be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. Household calorimeter capable of adjusting flow rate is characterized by comprising: the CPU main module is respectively connected with the switching power supply module, the radio frequency transmission module, the keyboard and display module, the current output module, the pipeline flow acquisition module and the pipeline temperature acquisition module, and the current output module is connected with an electric regulating valve arranged on a heat supply pipeline; the intelligent heat supply system comprises a pipeline flow collection module, a pipeline temperature collection module, a CPU main module, a keyboard and a display module, wherein the pipeline flow collection module is used for collecting heat-carrying liquid flow of a heat supply pipeline, the pipeline temperature collection module is used for collecting heat-carrying liquid temperature of the heat supply pipeline, the CPU main module is used for storing the heat-carrying liquid flow and the heat-carrying liquid temperature and calculating heat released by the heat-carrying liquid, the keyboard and the display module are used for setting parameters, indicating the states of a power supply and a heat meter and displaying the temperature/flow and the heat, a current output module is used for outputting currents with different sizes and controlling the opening degree of an electric adjusting valve, a radio frequency transmission module is used for transmitting the temperature/flow and the heat to an intelligent control center in a non-contact mode, and a switching power supply module is used for providing a working power supply for the heat meter.
2. The household adjustable flow rate heat meter according to claim 1, comprising: the CPU main module comprises: the device comprises a data interface, an analog interface, a communication interface, an interrupt interface and a serial port data interface; the switch power supply module provides 3.3V direct-current power supply for the whole heat meter, the keyboard and the display module are connected with a data interface of the CPU main module through an I/O interface, the radio frequency transmission module is connected with a communication interface of the CPU main module through a serial port signal line, the pipeline flow acquisition module is connected with the data interface and an interrupt interface of the CPU main module, the pipeline temperature acquisition module is connected with an analog interface of the CPU main module, and the current output module is connected with a serial port data interface of the CPU main module.
3. The household calorimeter capable of adjusting the flow rate according to claim 2, wherein the current output module adopts a TLC5615 chip to convert serial data into a voltage signal, and then the voltage signal is modulated into a control current signal of 4-20mA through an LM2903 amplifier.
4. The household heat meter capable of adjusting flow rate according to claim 2, wherein the radio frequency transmission module comprises: the chip comprises a radio frequency transmission circuit and a CC2530 chip, U4 is a CC2530 radio frequency data transmission chip, and C14, C15, C16, C17, C18, C19, C20 and C21 are filter capacitors of all voltage ports of the chip respectively; the R5 and the C10 form a power-on reset circuit of the chip; r6 and C11 are respectively a grounding resistor and a capacitor of a chip port; y2 is a crystal oscillator of the internal clock of the chip, C12 and C13 are grounding capacitors of the crystal oscillator, and VL3 is a power inductor; c32 is a filter capacitor; c33 and C34 are blocking capacitors, and the size of the transmitting power is determined by the parameters of C30, C31, L5 and L6; ANT1 is a PCB printed board radiator.
5. The household heat meter capable of adjusting flow rate according to claim 2, wherein the pipeline flow rate collecting module comprises: the device comprises a pipeline flow acquisition circuit and two ultrasonic sensors, wherein H3 is an ultrasonic sensor input interface single-row connector and is externally connected with two ultrasonic sensors for measuring the flow of heat-carrying liquid; r24 and R25 are current limiting resistors of the two ultrasonic sensor emission control interfaces, and C35 and C36 are blocking capacitors of the two ultrasonic sensor reflection loops.
6. The household heat meter capable of adjusting flow rate according to claim 2, wherein the pipeline temperature acquisition module comprises: the pipeline temperature acquisition circuit and two PT1000 thermal resistors are respectively arranged at the water inlet and the water outlet of the heat supply pipeline, and H4 is a single-row connector of a PT1000 thermal resistor input interface and is externally connected with two thermal resistors for temperature measurement input; r26 is the ground resistance of the thermal resistance sampling circuit, and forms a voltage dividing circuit with the PT1000 thermal resistance, and C37 is the filter capacitance of the analog input signal.
7. The household heat meter capable of adjusting a flow rate according to claim 2, wherein the CPU main module comprises: CPU main circuit structure and DSPIC33F microprocessor, U1 is main chip DSPIC 33F; c1, C2, R1 and Y1 form a crystal oscillator circuit, and U2 and R2 form a power-on reset circuit; u3 is data memory, can keep storing the data in the state of power down, C3 is the filter capacitance of its voltage port, R3, R4 are the pull-up resistance of the data interface; the H1 connector is a programming and debugging interface of the U1 chip; c4, C5, C6 and C7 are power interface filter capacitors of the U1 chip; c8 and C9 are analog power interface filter capacitors of the U1 chip; the L1 and L2 provide the internal AVDD power supply voltage for the U1 chip.
8. The household heat meter capable of adjusting a flow rate according to claim 2, wherein the keyboard and display module comprises: the LED lamp display device comprises a four-keyboard input circuit, an LED lamp indicating circuit and a liquid crystal display circuit;
k1, K2, K3, K4 make up four keyboard input circuits, R20, R21, R22, R23 are the pull-up resistance of the key value input interface;
the LED lamp indicating circuit consists of 2 groups of LED lamp driving circuits, and D3 and D4 are LED light-emitting tubes; r14 and R16 are respectively current-limiting resistors of an LED, Q1 and Q2 are PNP triodes, and R13 and R15 are driving current-limiting resistors of the PNP triodes;
the liquid crystal display circuit displays related temperature, flow and heat, and U9 is a liquid crystal display interface; r17 is pull-up resistor selected by interface mode of LCD to provide high level for interface; c29 and R18 form a power-on reset circuit; r19 and Q3 are backlight control circuits of the liquid crystal display.
9. The household heat meter with the flow rate adjustable according to claim 2, characterized in that the switching power supply module converts alternating current 220V voltage of commercial power into direct current 3V3 voltage required by the heat meter, U5 is a diode rectifier bridge, and C22 is a rectified filter capacitor; u6 is a special low-power switch power supply conversion chip, and C23 is a filter capacitor at a feedback control end; u7 is the feedback control end isolation signal input, C24 and Y3 are chip input filter capacitors; r7 is a chip one end grounding resistor; r8, C25 and D1 form a current-limiting filter circuit; t1 is power transformer; d2 and C26 are output rectifying and filtering circuits; r9, C27 and U8 are feedback control isolation circuits; r10, R11 are sampling reference points of the feedback circuit; l4 is a voltage output power inductor; r12 and C28 are direct-current voltage output protection and filter circuits, and H2 is an alternating-current voltage input interface.
10. The household heat meter capable of adjusting the flow rate according to any one of claims 1 to 9, wherein the heat meter data collected in real time is transmitted to a remote control center through a GPRS technology.
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| CN113155322A (en) * | 2021-02-02 | 2021-07-23 | 山东通源电气有限公司 | Flow-adjustable non-contact household heat meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113155322A (en) * | 2021-02-02 | 2021-07-23 | 山东通源电气有限公司 | Flow-adjustable non-contact household heat meter |
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