A temperature flow detection circuit and sensor thereof

Abstract

The present invention discloses a temperature flow detection circuit and a sensor thereof, which relates to flow detection technology, and aims to solve the problem that when comparing the size of the flow in adjacent pipelines, multiple flow meters need to be used for detection and comparison, and data comparison is performed through information processing equipment such as a single-chip microcomputer, which is cumbersome to operate. The key points of the technical solution are: it includes a pressure difference detection module, which is connected between adjacent pipelines and is used to detect the pressure difference between adjacent pipelines to output a pressure detection signal as an analog signal, and a temperature detection module, which is connected to the pipeline and is used to detect the temperature of the fluid in the pipeline to output a temperature detection signal as an analog signal. The present invention compares the pressure difference between adjacent pipelines through the pressure difference detection module, and detects the temperature of the fluid through the temperature detection module, has a high degree of integration, and uses the information processing module to infer the difference in flow rate between the two pipelines through the pressure detection signal of the pressure difference, which is convenient for people to operate.

Description

Technical Field

[0001] The present invention relates to flow detection technology, and more specifically, to a temperature flow detection circuit and a sensor thereof. Background Art

[0002] In industrial sites, instruments that measure fluid flow are collectively called flow meters or flow meters. They are one of the most important instruments in industrial measurement. With the development of industry, the accuracy and range of flow measurement are increasingly required. In order to adapt to a variety of uses, various types of flow meters have been introduced and widely used in industries such as oil and gas, petrochemicals, water treatment, food and beverage, pharmaceuticals, energy, metallurgy, pulp and paper, and building materials.

[0003] The flow-temperature integrated sensor disclosed in the Chinese patent with publication number CN209355984U has the following technical points: it includes a shell, a water flow rotor assembly, a throttling assembly and a flow sensor assembly; the water flow rotor assembly and the throttling assembly are sequentially installed at both ends of the shell along the fluid forward direction; the flow sensor assembly is connected and installed on the shell to detect the flow of the fluid flowing through the shell and transmit the detection signal; it also includes a temperature sensor assembly; the temperature sensor assembly is connected and installed on the shell to detect the temperature of the fluid flowing through the shell and transmit the detection signal.

[0004] The above solution solves the problem that the accuracy of fluid flow measurement is affected by non-detectable turbulence factors caused by the bend in the shell during the flow process. However, the existing flow meter can only be connected to a single pipe to detect the flow of the fluid in a single pipeline. When comparing the flow rates in adjacent pipelines, multiple flow meters need to be used for detection and comparison, and data comparison is performed through information processing equipment such as single-chip microcomputers, which is cumbersome.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a temperature flow detection circuit and a sensor thereof, which compares the pressure difference between adjacent pipelines through a pressure difference detection module, and then uses an information processing module to infer the difference in flow rate between the two pipelines through a pressure detection signal of the pressure difference, thereby facilitating people's operation.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a temperature flow detection circuit, comprising

[0008] A pressure difference detection module, connected between adjacent pipelines, for detecting the pressure difference between adjacent pipelines to output a pressure detection signal as an analog signal;

[0009] A temperature detection module is connected to the pipeline and is used to detect the temperature of the fluid in the pipeline to output a temperature detection signal as an analog signal;

[0010] The information processing module is connected to the pressure difference detection module and the temperature detection module, and is used to convert the pressure detection signal into a flow signal of a digital signal.

[0011] By adopting the above technical solution, a pressure difference detection module is set between adjacent pipelines, so that the fluid flowing through the two pipelines can form a pressure difference due to the difference in flow rate. The pressure difference detection module detects the pressure difference and outputs a pressure detection signal. In addition, the temperature of the fluid flowing through the pipeline can be detected by adding a temperature detection signal. The temperature detection signal and the pressure difference detection information are collected and processed by the information processing module, so that people can measure the flow rate and temperature of the fluid in the pipeline, which is convenient for people to timely adjust the flow rate of the fluid in the pipeline through accessories such as throttle valves.

[0012] The present invention is further configured as follows: the pressure difference detection module includes a Hall element and a sensing member slidably connected between adjacent pipes, and the Hall element detects the displacement of the sensing member to output a displacement signal.

[0013] By adopting the above technical solution, by using the cooperation of the Hall element and the sensing part sliding in the pipeline, when the sensing part is displaced, the Hall element senses the change of the inductive magnetic field and outputs a displacement signal as a voltage or current, with high detection accuracy and protecting the service life of the Hall element.

[0014] The present invention is further configured such that: the Hall element is connected to a differential amplifier circuit.

[0015] By adopting the above technical solution, the output end of the Hall element is connected to the differential amplifier circuit, so that the displacement of the sensing element causes a slight signal of the Hall element to be generated, which can be amplified by the differential amplifier circuit, and the temperature drift due to the external temperature is reduced, thereby improving the accuracy of the pressure difference detection between pipelines.

[0016] The present invention is further configured as follows: the output end of the differential amplifier circuit is connected to the information processing module via an A / D conversion circuit.

[0017] By adopting the above technical solution, the pressure difference signal is amplified through the A / D conversion module, the stability of the pressure difference signal is improved, and when the information processing module receives the pressure difference signal, it has good accuracy and is convenient for processing the pressure difference signal, thereby improving the working efficiency of the information processing module.

[0018] The present invention is further configured to include a power supply module, which is coupled to the temperature detection module and the pressure difference detection module and is used to convert the mains electricity into a driving voltage supplied to the temperature detection module and the pressure difference detection module.

[0019] By adopting the above technical solution, the AC power is converted into a driving voltage for supplying the temperature detection module and the pressure difference detection module through the power supply module, so that the temperature detection module and the pressure difference detection module have a stable power supply, thereby improving the detection accuracy of the temperature detection module and the pressure difference detection module, and are not easily affected by errors caused by voltage fluctuations.

[0020] The present invention is further configured as follows: the power supply module includes a bridge rectifier circuit and a plurality of three-terminal regulators.

[0021] By adopting the above technical solution, AC power can be easily converted into DC power through bridge rectification, and the voltage is stabilized by a three-terminal regulator, so that the driving voltage supplied to the temperature detection module and the pressure difference detection module has good stability.

[0022] A temperature flow sensor comprises the temperature flow detection circuit of claims 1-6 and a shell, wherein a cavity for accommodating the temperature flow detection circuit is provided in the shell.

[0023] By adopting the above technical solution, a cavity for accommodating the temperature flow detection circuit is provided in the shell, so that the temperature flow detection circuit is effectively protected from external influences and the service life of the temperature flow detection circuit is improved.

[0024] The present invention is further configured as follows: a flow channel penetrating the shell is provided in the shell, a magnetic part closing the flow channel is slidably connected in the flow channel, an isolating part located between the flow channel and the cavity is provided in the shell, and a recess for accommodating the Hall element is opened on the isolating part.

[0025] By adopting the above technical solution, the flow channel and the cavity are separated by the isolation part, thereby effectively protecting the temperature flow detection circuit from the influence of the fluid. At the same time, the setting of the recess facilitates the fixing of the Hall element, thereby improving the stability of the installation of the Hall element. When the sensor moves, the Hall element is not easily displaced, thereby improving the accuracy of the pressure difference detection.

[0026] The present invention is further configured as follows: the isolation portion is provided with an embedding groove located at one end of the magnetic member and communicated with the flow channel, and a temperature probe connected to the temperature flow detection circuit is clamped in the embedding groove.

[0027] By adopting the above technical solution, the temperature probe is embedded in the embedding groove to seal the embedding groove, and the fluid temperature on one side of the magnetic part can be detected, thereby improving the accuracy of temperature detection.

[0028] In summary, the present invention has the following beneficial effects:

[0029] By setting up a pressure difference detection module between adjacent pipelines, a pressure difference can be formed by the difference in flow rate when the fluid flows through the two pipelines. The pressure difference detection module detects the difference in pressure and outputs a pressure detection signal. In addition, by adding a temperature detection signal, the temperature of the fluid flowing through the pipeline can be detected. The temperature detection signal and the pressure difference detection information are collected and processed by the information processing module, so that people can measure the flow rate and temperature of the fluid in the pipeline, which is convenient for people to timely adjust the flow rate of the fluid in the pipeline through accessories such as throttle valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural block diagram of the temperature flow detection circuit in the present invention;

[0031] Figure 2 is a circuit schematic diagram of the pressure difference detection module in the present invention;

[0032] Figure 3 is a circuit schematic diagram of the power module in the present invention;

[0033] Figure 4 This is a circuit diagram of the temperature detection module in the present invention;

[0034] Figure 5 is a circuit schematic diagram of the information processing module in the present invention;

[0035] Figure 6 It is a structural schematic diagram of the temperature flow sensor in the present invention;

[0036] Figure 7 is a cross-sectional view of the temperature flow sensor of the present invention;

[0037] Figure 8 for Figure 7 Enlarged schematic diagram of part A in the middle.

[0038] In the figure: 1. differential pressure detection module; 2. temperature detection module; 3. information processing module; 4. Hall element; 5. differential amplifier circuit; 6. bridge rectifier circuit; 7. three-terminal voltage regulator; 8. housing; 9. cavity; 10. flow channel; 11. magnetic part; 12. isolation part; 13. recessed part; 14. temperature probe. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] Embodiment 1:

[0041] A temperature flow detection circuit, such as Figure 1As shown, it includes a pressure difference detection module 1, a temperature detection module 2 and an information processing module 3, wherein the pressure difference detection module 1 is connected between adjacent pipelines, so that the pressure difference detection module 1 detects the pressure difference between adjacent pipelines to output a pressure detection signal as an analog signal. For the temperature detection module 2, the temperature detection module 2 is connected to one of the pipelines, so that the temperature detection module 2 detects the temperature of the fluid in the pipeline to output a temperature detection signal as an analog signal. For the information processing module 3, the information processing module 3 is connected to the pressure difference detection module 1 and the temperature detection module 2 to realize the conversion of the pressure detection signal into a flow signal of a digital signal.

[0042] like Figure 1 As shown, it also includes a throttle valve connected to the information processing module 3 as a solenoid valve, as well as an LCD liquid crystal display screen and a driving circuit for the liquid crystal display screen, so as to enable the information processing module 3 to display the pressure detection signal and the temperature detection signal through the LCD liquid crystal display screen.

[0043] like Figure 2 As shown, the pressure difference detection module 1 includes a Hall element 4U1 and a sensing element slidably connected between adjacent pipes. The Hall element 4U1 detects the displacement of the sensing element to output a displacement signal. The specific sensing element is a metal slider with a magnetic pole, and when the sensing element is displaced, the magnetic field changes with the displacement of the sensing element, thereby causing the current or voltage of the Hall element 4U1 to increase or decrease linearly, and the two ends of the Hall element 4U1 are connected to a differential amplifier circuit 5, wherein the differential amplifier circuit 5 is based on an operational amplifier, specifically, the same-direction input terminal and the reverse input terminal of the operational amplifier are respectively connected to the Hall element 4U1, and the output terminal of the differential amplifier circuit 5 is connected to the information processing module 3 through an A / D conversion circuit.

[0044] like Figure 3 As shown, it also includes a power module, which is coupled to the temperature detection module 2 and the pressure difference detection module 1, and is used to convert the mains electricity into a driving voltage for supplying the temperature detection module 2 and the pressure difference detection module 1. Specifically, the power module includes a bridge rectifier circuit 6 and a three-terminal regulator 7, wherein the three-terminal regulator 7 of the model CW7815 and F1117 are selected to realize the voltage passing through the bridge rectifier circuit 6 to be stepped down to a driving voltage of 15V and 3.3V in turn. The operational amplifier in the differential amplifier circuit 5 is powered by the 15V voltage, and the information processing module 3 is powered by the 3.3V voltage.

[0045] like Figure 4As shown, the temperature detection circuit is composed of a strain gauge bridge resistor RT, a first resistor R7, a second resistor R8 and a third resistor R9. In this embodiment, the second resistor R8 and the third resistor R9 are fixed resistors of the same resistance and the same category, and the strain gauge bridge resistor RT is a thermistor with a negative temperature coefficient, and the initial resistance of the strain gauge bridge resistor RT is the same as that of the first resistor R7. In the natural state, the temperature detection circuit is in a balanced state, and the voltage at the output end of the temperature detection circuit is zero in the balanced state. The balanced state means that the voltage between the common end of the strain gauge bridge resistor RT and the second resistor R8 and the common end of the first resistor R7 and the third resistor R9 is zero, and the output end of the temperature detection circuit is connected to an operational amplifier circuit.

[0046] like Figure 4 As shown, the common end of the strain gauge bridge resistor RT and the first resistor R7 is connected to the power supply VCC, the common end of the second resistor R8 and the third resistor R9 is grounded, the common end of the strain gauge bridge resistor RT and the second resistor R8 is connected to the in-phase input end of the operational amplifier circuit via the adjustable resistor RP, and the common end of the first resistor R7 and the third resistor R9 is connected to the inverting input end of the operational amplifier circuit.

[0047] like Figure 4 As shown, an adjustment circuit is electrically connected between the temperature detection circuit and the operational amplifier circuit, and the adjustment circuit includes a filter capacitor C1 and an adjustable resistor RP. The filter capacitor C1 is arranged in parallel with the second resistor R8, and the adjustable resistor RP is connected in series between the temperature detection circuit and the operational amplifier circuit to adjust the voltage output by the temperature detection circuit. By adjusting the resistance value of the adjustable resistor RP, the voltage at the output end of the temperature detection circuit is divided, thereby adjusting the voltage transmitted from the temperature detection circuit to the operational amplifier circuit.

[0048] like Figure 5 As shown, the information processing module 3 is a chip minimum system based on the chip MSP430f149, a first crystal oscillator circuit and a second crystal oscillator circuit. The REST end of the chip MSP430f149 is connected to a reset circuit. The clock signal frequency of the first crystal oscillator circuit is 8 MHz, and the clock signal frequency of the second crystal oscillator circuit is 32.768 Hz, which plays an energy-saving role when realizing temperature and pressure difference detection and standby state.

[0049] Embodiment 2:

[0050] A temperature flow sensor includes the temperature flow detection circuit in Example 1 and a shell 8, wherein the shell 8 is integrally processed by injection molding, and a cavity 9 for accommodating the temperature flow detection circuit is formed at the top of the shell 8, and a cover plate for closing the cavity 9 is detachably connected to the top of the shell 8 by screw connection, and a flow channel 10 penetrating the shell 8 is formed in the shell 8, and connecting parts communicating with the flow channel 10 are embedded at both ends of the flow channel 10, and the connecting parts are threadedly connected with a quick connector communicating with the flow channel 10, an isolation part 12 located between the flow channel 10 and the space is provided in the shell 8, a recess 13 for accommodating a Hall element 4U1 is provided on the isolation part 12, so that the Hall element 4U1 can be snapped into the recess 13, a magnetic part 11 for closing the flow channel 10 is slidably connected in the flow channel 10, and the specific magnetic part 11 is the induction part in Example 1, and an embedding groove located at one end of the magnetic part 11 and communicating with the flow channel 10 is provided on the isolation part 12, and a temperature probe 14 connected to the temperature flow detection circuit is snapped into the embedding groove, such as Figure 7 As shown, the magnetic member 11 is slidably connected between two adjacent connecting parts, and the magnetic member 11 divides the flow channel 10 into a detection end and a reference end. The diameter of the detection end is smaller than the diameter of the reference end, and a limiting end with the same diameter as the reference end is formed on the side of the magnetic member 11 facing the reference end, so that when the reference end is connected to an external pipeline or an air compressor, the differential pressure between the air pressure in the pipeline to be detected and the air pressure provided by the air compressor can be adjusted.

[0051] During the working process, the reference end of the temperature flow sensor is connected to an air compressor with a set air pressure, and then the quick connector of the detection end of the temperature flow sensor is connected to the pipeline to be detected, so that the fluid flowing through the detection end flows into the detection end, and the fluid contacts the temperature probe 14. The temperature detection module 2 is connected to the temperature probe 14, and the temperature of the fluid is measured and transmitted to the information processing module 3. Since the detection end is connected to the pipeline, the pressure balance between the pipeline and the detection end is achieved. When the flow rate of the fluid increases, the pressure of the fluid in the pipeline increases, and the force acting on the magnetic part 11 toward the reference end is applied. When the pressure of the fluid is greater than the reference pressure provided by the air compressor, the magnetic part 11 is displaced, thereby changing the position of the Hall element 4 in the magnetic field of the magnetic part 11, causing the voltage signal or current signal at both ends of the Hall element 4 to increase or decrease, and through the differential amplifier circuit 5 plays an amplifying role in the change of voltage signal, and the differential amplifier circuit 5 can suppress the influence of temperature on signal amplification, improve the detection accuracy of the pressure difference detection module 1, and convert the pressure detection signal and temperature detection signal collected by the pressure difference detection module 1 and the temperature detection module 2 into digital signal data through the A / D conversion circuit through the information processing module 3, and transmit the analog signal to the LCD liquid crystal display screen for display through the encoding and decoding of the chip MSP430f149, and count the flow rate of the fluid in the pipeline by using the formula of the pressure and flow rate conversion in the pipeline through the chip MSP430f149, and when the two ends of the temperature flow sensor are connected to the adjacent two pipelines, the pressure difference between the flow rates between the adjacent pipelines is obtained through the displacement of the magnetic member 11, so that people can adjust the throttle valve of the electromagnetic valve through the detected data to achieve flow regulation.

[0052] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A temperature flow sensor, characterized in that: It comprises a temperature flow detection circuit and a housing (8), wherein a cavity (9) for accommodating the temperature flow detection circuit is provided in the housing (8); The temperature flow detection circuit comprises: A pressure difference detection module (1) is connected between adjacent pipelines and is used to detect the pressure difference between the adjacent pipelines to output a pressure detection signal as an analog signal, wherein the pressure difference detection module (1) comprises a Hall element (4) and a sensing element slidably connected between the adjacent pipelines, and the Hall element (4) detects the displacement of the sensing element to output a displacement signal; A temperature detection module (2) is connected to the pipeline and is used to detect the temperature of the fluid in the pipeline and output a temperature detection signal as an analog signal; An information processing module (3) is connected to the pressure difference detection module (1) and the temperature detection module (2) and is used to convert the pressure detection signal into a flow signal in the form of a digital signal; The housing (8) is provided with a flow channel (10) penetrating the housing (8), the flow channel (10) is slidably connected with a magnetic member (11) which closes the flow channel (10) and serves as a sensing member, the housing (8) is provided with an isolating portion (12) located between the flow channel (10) and the cavity (9), the isolating portion (12) is provided with a recess (13) for accommodating the Hall element (4), both ends of the flow channel (10) are embedded with connecting portions which are in communication with the flow channel (10), and the connecting portions are threadedly connected with quick connectors which are in communication with the flow channel (10); When working, connect the quick connector at the detection end of the temperature flow sensor to the pipeline to be detected.

2. A temperature flow sensor according to claim 1, characterized in that: The Hall element (4) is connected to a differential amplifier circuit (5).

3. A temperature flow sensor according to claim 2, characterized in that: The output end of the differential amplifier circuit (5) is connected to the information processing module (3) via an A / D conversion circuit.

4. A temperature flow sensor according to claim 1, characterized in that: It also comprises a power supply module, which is coupled to the temperature detection module (2) and the pressure difference detection module (1) and is used to convert the mains electricity into a driving voltage supplied to the temperature detection module (2) and the pressure difference detection module (1).

5. A temperature flow sensor according to claim 4, characterized in that: The power module comprises a bridge rectifier circuit (6) and a plurality of three-terminal regulators (7).

6. A temperature flow sensor according to claim 1, characterized in that: The isolation portion (12) is provided with an embedding groove located at one end of the magnetic member (11) and connected to the flow channel (10), and a temperature probe (14) connected to the temperature flow detection circuit is clamped in the embedding groove.

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