A detection head based on flue gas ultrasonic metering

Abstract

The utility model relates to flue gas detection technical field, and disclose a kind of detection head based on flue gas ultrasonic measurement, including shell and plug rod, signal test component is provided in the shell, signal test component includes two groups of symmetrical setting transducer, sound channel is provided between the transducer;Connecting component is provided between the shell and plug rod, cable is penetrated in the plug rod, signal test component includes the mounting seat setting in shell, the transducer is installed in mounting seat.This utility model sets up straight-through sound channel, middle does not need reflection, as far as possible avoid the situation that reflecting surface is contaminated, to guarantee detection accuracy, simultaneously by being provided with first sealing washer and second sealing washer between shell and flange respectively, utilize the structure of plane, radial third sealing washer combination, improve the waterproof performance of detection head.

Description

Technical Field

[0001] This utility model relates to the field of flue gas detection technology, specifically to a detection head for flue gas ultrasonic metering. Background Technology

[0002] In process volumetric flow metering technology, ultrasonic meters are particularly used for measuring volumetric flow rates. They essentially consist of a measuring sensor, an ultrasonic transducer, and a signal processing unit. The measuring sensor includes a pipe fitting with a welded connecting flange. The ultrasonic transducer, also known as an ultrasonic detector, is installed in the pipe fitting (intermediate component) of the measuring sensor. The signal processing unit is used to control the ultrasonic detector and to process the signal output by the detector.

[0003] In existing technologies, most are designed as reflective types, with two internal ultrasonic probes mounted on the same side. The ultrasonic waves need to be reflected back before being received, and the reflective surface is easily contaminated. Over long-term use, this affects the measurement results and cannot guarantee measurement accuracy. Utility Model Content

[0004] This invention provides a detection head for ultrasonic metering of flue gas, which solves the problem mentioned in the background art that most of them are designed as reflective types, with two ultrasonic probes inside mounted on the same side, requiring ultrasonic waves to be reflected back before being received. The reflective surface is easily contaminated, which affects the metering results and makes it impossible to guarantee the metering accuracy during long-term use.

[0005] This utility model provides the following technical solution: a detection head for ultrasonic metering of flue gas, comprising a housing and a plug rod, wherein a signal testing component is provided inside the housing, the signal testing component includes two sets of symmetrically arranged transducers, and a sound channel is provided between the transducers; a connecting component is provided between the housing and the plug rod, and a cable passes through the plug rod.

[0006] As an optional solution of the detection head for ultrasonic metering of flue gas described in this utility model, the signal testing component includes a mounting base disposed within the housing, and the transducer is installed within the mounting base.

[0007] As an optional solution of the detection head for ultrasonic metering of flue gas described in this utility model, a third sealing ring is provided in the mounting base at the installation position of the transducer, and a purging assembly is connected to one side of the mounting base.

[0008] As an optional solution of the ultrasonic metering detection head for flue gas described in this utility model, the connecting assembly includes a first flange and a second flange respectively disposed on both sides of the housing, and the second flange and the plug rod are fixedly connected.

[0009] As an optional solution for the ultrasonic metering detection head for flue gas described in this utility model, the insertion rod is configured as a hollow rod structure.

[0010] As an optional solution of the detection head for ultrasonic metering of flue gas described in this utility model, an air outlet is provided on one side of the sound channel, and an air inlet is provided on the other side of the sound channel, with the air outlet and the air inlet connected together.

[0011] As an optional solution of the ultrasonic metering detection head for flue gas described in this utility model, the housing is provided with a first sealing ring and a second sealing ring at the connection between the first flange and the second flange.

[0012] This utility model has the following beneficial effects: 1. This detection head for ultrasonic metering of flue gas, by setting a straight-through sound channel, eliminates the need for intermediate reflections, thereby minimizing the contamination of the reflective surface and ensuring detection accuracy; 2. This detection head for ultrasonic metering of flue gas improves the waterproof performance of the detection head by setting a first sealing ring and a second sealing ring between the shell and the flange respectively, and utilizing a structure combining a planar and radial third sealing ring. 3. This detection head based on ultrasonic metering of flue gas, by setting up a purging mechanism and using an external electrical control box, controls the solenoid valve to achieve the periodic purging function through the connection structure of solenoid valve, air pipe and bellows, to ensure the cleanliness of the detection channel and further improve the detection accuracy. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the detection head of this utility model.

[0014] Figure 2 This is a cross-sectional view of the detection head of this utility model.

[0015] Figure 3 For the present utility model Figure 2 Enlarged structural diagram of section A.

[0016] In the diagram: 1. Housing; 2. Insert rod; 3. Cable; 4. Transducer; 5. Air outlet; 6. Air inlet; 7. Mounting base; 8. First flange; 9. First sealing ring; 10. Second sealing ring; 11. Third sealing ring; 12. Purge port; 13. Second flange. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1, please refer to Figures 1 to 3 This utility model discloses a detection head for ultrasonic metering of flue gas, including a housing 1 and a plug 2. The housing 1 is provided with a signal testing component, which includes two sets of symmetrically arranged transducers 4.

[0019] In this embodiment, the housing 1 is configured as a straight-through type, which has a shorter sound path and does not require reflection in the middle compared to the reflective type in the prior art, effectively avoiding the pollution caused by the reflected reception signal.

[0020] It should be noted that, due to the high temperature, high humidity and high oil conditions of the chimney, the housing 1 of transducer 4 is made of waterproof and corrosion resistant material, and the material is titanium alloy. The signal and anti-interference ability are tested by adjusting the thickness of the end face.

[0021] Both the housing 1 and the insertion rod 2 are made of polytetrafluoroethylene (PTFE) to meet the requirements of mechanical strength and corrosion resistance. The self-lubricating properties of PTFE enhance the anti-fouling ability. The insertion rod 2 is made of titanium alloy, which increases strength while reducing weight.

[0022] A connecting assembly is provided between the housing 1 and the insertion rod 2. A cable 3 passes through the insertion rod 2. The connecting assembly includes a first flange 8 and a second flange 13 respectively provided on both sides of the housing 1. The second flange 13 is fixedly connected to the insertion rod 2. The insertion rod 2 is configured as a hollow rod structure.

[0023] In this embodiment, a plug rod 2 is connected to one side of the housing 1. When in use, the housing 1 and the transducer 4 inside the housing 1 are inserted into the sampling hole of the chimney to be tested. The plug rod 2 is used to support the detection mechanism, and at the same time, the plug rod 2 is used as a protective sleeve for the cable 3 used for signal output.

[0024] Example 2, please refer to Figures 1 to 3 The signal testing assembly also includes a mounting base 7 disposed within the housing 1, the transducer 4 is installed within the mounting base 7, a third sealing ring 11 is disposed within the mounting base 7 at the installation position of the transducer 4, and a purging assembly is connected to one side of the mounting base 7.

[0025] In this embodiment, a purging mechanism is added. The purging assembly includes a purging interface 12. The micro plug purging interface 12 is embedded in the mounting base 7, and the nozzle is aligned with the end face of the transducer 4 on the opposite side. The purging interface 12 is connected to an air pipe. The air pipe enters the external control box through the inside of the insert rod 2, and then connects to the external electrical control box through a corrugated pipe. The external electrical control box is connected to a solenoid valve that communicates with the purging interface 12. The integrator set in the external electrical control box controls the solenoid valve through a program to realize the periodic purging function.

[0026] The external control box and its internal structure and working principle are all existing technologies, so they will not be described in detail here.

[0027] Example 3, please refer to Figures 1 to 3 A sound channel is provided between the transducers 4. An air outlet 5 is provided on one side of the sound channel, and an air inlet 6 is provided on the other side of the sound channel. The air outlet 5 and the air inlet 6 are connected.

[0028] In this embodiment, the sound channel is the path through which the sound waves from transducer 4 travel. Its length is determined by the signal from transducer 4, the accuracy level required by the external control box connected to the detection system, and the timing accuracy of the signal processing unit in the external control box. Considering the incident angle of the sound channel, the smaller the angle with the axis, the longer the distance being measured, the greater the resistance to vortex flow fields, and the higher the accuracy. Considering the spatial structure, the incident angle is preferably 50°-70°.

[0029] Example 4, please refer to Figures 1 to 3 The housing 1 is provided with a first sealing ring 9 and a second sealing ring 10 at the connection between the first flange 8 and the second flange 13, respectively.

[0030] In this embodiment, a first sealing ring 9 and a second sealing ring 10 are respectively provided at the connection between the housing 1 and the first flange 8 and the second flange 13. The first sealing ring 9 is a radial sealing structure and the second sealing ring 10 is a planar sealing structure. By using a sealing structure that combines planar and radial sealing, the IP68 protection requirement is achieved and the waterproof performance of the detection head is improved.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A detection head for ultrasonic metering of flue gas, comprising a housing (1) and a probe (2), characterized in that: The housing (1) is provided with a signal testing component, which includes two sets of symmetrically arranged transducers (4) and a sound channel is provided between the transducers (4); A connecting assembly is provided between the housing (1) and the plug (2), and a cable (3) passes through the plug (2).

2. The detection head for ultrasonic metering of flue gas according to claim 1, characterized in that: The signal testing assembly includes a mounting base (7) disposed within the housing (1), and the transducer (4) is mounted within the mounting base (7).

3. The detection head for ultrasonic metering of flue gas according to claim 2, characterized in that: A third sealing ring (11) is provided in the mounting base (7) at the installation position of the transducer (4), and a purging assembly is connected to one side of the mounting base (7).

4. The detection head for ultrasonic metering of flue gas according to claim 1, characterized in that: The connecting assembly includes a first flange (8) and a second flange (13) respectively disposed on both sides of the housing (1), and the second flange (13) and the plug rod (2) are fixedly connected.

5. A detection head for ultrasonic metering of flue gas according to any one of claims 1 or 4, characterized in that: The insertion rod (2) is configured as a hollow rod structure.

6. A detection head for ultrasonic metering of flue gas according to claim 1, characterized in that: An air outlet (5) is provided on one side of the sound channel, and an air inlet (6) is provided on the other side of the sound channel. The air outlet (5) and the air inlet (6) are connected.

7. A detection head for ultrasonic metering of flue gas according to claim 1, characterized in that: The housing (1) is provided with a first sealing ring (9) and a second sealing ring (10) at the connection between the first flange (8) and the second flange (13).

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