Gas-liquid two-phase mass flowmeter

Abstract

The utility model relates to the field of two-phase fluid metering, in particular to a gas-liquid two-phase mass flowmeter which comprises an ultrasonic transducer and an installation mechanism, the installation mechanism comprises a main clamping plate component and an auxiliary clamping plate component, the main clamping plate component comprises an arc-shaped plate, the arc-shaped plate is connected with a guide rod in a sliding mode, and a first connecting plate is in threaded connection with a bolt. The positioning block is slidably connected with the connecting rod, a fastening mechanism for fixing the ultrasonic transducer is fixedly connected to the positioning block, a third sliding block is arranged in the mounting plate, one end of the third sliding block can clamp and position the ultrasonic transducer, and a coupling frame for sealing the pipeline and the connecting surface of the ultrasonic transducer is detachably arranged; by arranging an arc-shaped plate, a bolt, a positioning block and a fastening mechanism, the pipeline fixing device can adapt to pipelines with different diameters, installation can be accurately and rapidly completed, and efficiency and flexibility are improved; and by arranging a sliding groove, a sliding rail, a third sliding block, a control rod, a limiting block, a via hole and a notch, the ultrasonic transducer can be easily detached from the mounting plate, and maintenance and replacement are convenient.

Description

Technical Field

[0001] The utility model relates to the field of two-phase fluid metering, and particularly to a gas-liquid two-phase mass flowmeter. Background Technique

[0002] Ultrasonic flowmeters are widely used in measuring the mass flow of gas-liquid two-phase fluids due to their advantages such as non-invasiveness, high precision, and low maintenance cost. The measurement accuracy of an ultrasonic gas-liquid two-phase mass flowmeter depends not only on the flowmeter itself but also on the installation accuracy of the transducer (used for transmitting and receiving ultrasonic waves) of the flowmeter.

[0003] The main principle of an ultrasonic gas-liquid two-phase mass flowmeter for measuring the mass flow of a fluid is to utilize the Doppler effect or the time difference method. When using the time difference method for measurement, at least one pair of transducers needs to be installed on opposite sides of the pipeline and spaced a certain distance along the axial direction of the pipeline to ensure that the line connecting the transducers arranged oppositely on both sides of the pipeline intersects the central axis of the pipeline at the center point of the pipeline cross-section. The traditional installation method is to use a measuring tool (such as a tape measure) to measure and mark around the circumference of the pipeline and along the axial direction of the pipeline, then grind out a flat surface, and finally position and install the transducer. In this way, it is inevitable to cause relatively large measurement and installation errors. To solve this problem, there is an existing ultrasonic flowmeter, which includes a transducer and a prefabricated pipeline. The transducer is pre-positioned and encapsulated on the prefabricated pipeline. The prefabricated pipeline is a small section. During use, it only needs to connect the prefabricated pipeline to the production pipeline on-site through a flange or other connecting devices, solving the problem that inaccurate positioning of the transducer during on-site installation affects the measurement accuracy of the flowmeter.

[0004] However, this flowmeter with a prefabricated pipeline has poor flexibility during use. Especially for old production lines without reserved interfaces in the production pipeline, it is necessary to cut a section of the production pipeline before installation. Additionally, there is the problem of diameter matching between the prefabricated pipeline and the production pipeline. Finally, it is difficult and costly to maintain, repair, and replace the transducer of the flowmeter. Content of the Utility Model

[0005] The purpose of the utility model is to provide a mass flowmeter with a modular installation mechanism to solve the problems raised in the above background technique.

[0006] To achieve the above object, the utility model provides the following technical solution: a gas-liquid two-phase mass flowmeter, including an ultrasonic transducer and an installation mechanism, the installation mechanism includes a main clamping plate component and a secondary clamping plate component, the main clamping plate component includes arc-shaped plates, there are two groups of arc-shaped plates, both ends of the arc-shaped plates are respectively sleeved on the guide rods and form a sliding connection, the ends of the guide rods on the same group of arc-shaped plates are fixedly connected through a first connecting plate, a threaded hole is opened at the center of the first connecting plate and is threadedly connected with a bolt, the bolt passes through the first connecting plate and then rotatably connects the arc-shaped plate, the guide rods between the two groups of arc-shaped plates are connected through a connecting rod, there are two groups of connecting rods and they are parallel, a positioning block is slidably connected between the two groups of connecting rods, and a fastening mechanism for pressing and fixing the ultrasonic transducer is arranged at the center of the positioning block;

[0007] The difference between the secondary clamping plate component and the main clamping plate component is that the arc-shaped plate of the secondary clamping plate component is fixedly connected with the guide rod;

[0008] The main clamping plate component and the secondary clamping plate component are connected through a threaded sleeve.

[0009] Preferably, the fastening mechanism includes a screw rod, the screw rod is threadedly connected with the positioning block and passes through the positioning block and then is fixedly connected with a first slider, the first slider is slidably arranged in the inner cavity of a square sleeve, the square sleeve is fixedly connected with the positioning block, the lower end of the first slider is fixedly connected with the upper end of a first spring, the lower end of the first spring is fixedly connected with a second slider, the second slider is slidably arranged in the inner cavity of the square sleeve, the lower end of the second slider is fixedly connected with a mounting plate, and the ultrasonic transducer is mounted on the mounting plate.

[0010] Preferably, two groups of chutes are opened on the mounting plate, the chutes run through the mounting plate horizontally, slide rails corresponding and adapted to the chutes are arranged on the mounting surface of the ultrasonic transducer, notches are opened on the outer side surfaces of the slide rails, and the symmetry plane of the notches is coplanar with the mid-plane of the ultrasonic transducer; a sliding cavity is opened in the mounting plate, the sliding cavity communicates with the chutes, the sliding cavity is coplanar with the mid-plane of the mounting plate, a third slider is slidably arranged in the sliding cavity, a ball is arranged on one end surface of the third slider, the other end of the third slider is rotatably connected with a control rod, a second spring is sleeved on the control rod, the other end of the control rod passes through the sliding cavity and then is fixedly connected with a cross bar, a limiting block is fixedly arranged on the circumferential surface of the control rod, and a through hole through which the limiting block can pass is opened on the mounting plate.

[0011] Preferably, a groove is opened on the radiation surface of the ultrasonic transducer, a coupling frame is embedded in the groove, coupling paste is filled in the coupling frame, and a film is sealed on the lower end surface of the coupling frame.

[0012] Preferably, the surface of the coupling frame in contact with the pipeline is an arc surface, and the diameter of the arc surface is the same as that of the pipeline.

[0013] Preferably, the connecting rod is provided with scales, the positioning block is provided with an observation hole, the middle plane of the observation hole is coplanar with the middle plane of the positioning block, a pointer is arranged in the observation hole, and one end of the pointer is fixedly connected to the side wall of the observation hole.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] By providing the arc-shaped plate, bolts, positioning blocks and fastening mechanisms, pipelines with different diameters can be adapted, and installation can be completed accurately and quickly, improving efficiency and flexibility while ensuring installation accuracy.

[0016] By providing the screw rod, square sleeve, first slider, spring, second slider and mounting plate, the ultrasonic transducer can be easily separated from the pipeline. By providing the chute, slide rail, third slider, control rod, limit block, through hole and notch, the ultrasonic transducer can be easily disassembled from the mounting plate, facilitating maintenance and replacement.

[0017] By providing the coupling frame, the ultrasonic transducer can be directly installed on the pipeline, eliminating the step of grinding the flat surface on the pipeline.

[0018] 4. The lower end surface of the coupling frame is provided with an arc surface, and the coupling frame can be embedded into the mounting surface of the ultrasonic transducer through the groove. For pipelines with different diameters, the coupling frame can be easily replaced to achieve tight sealing between the coupling frame and the pipeline. Description of the Drawings

[0019] Figure 1 Schematic diagram of the overall structure of the present utility model;

[0020] Figure 2 Schematic diagram of another angle of the overall structure of the present utility model;

[0021] Figure 3 Schematic diagram of the present utility model after the fastening mechanism cuts through the square sleeve and the positioning block;

[0022] Figure 4 Schematic diagram of the coupling frame, ultrasonic transducer and mounting plate after cutting half of the present utility model;

[0023] Figure 5 The present utility model Figure 1 Enlarged view at A in;

[0024] Figure 6 The present utility model Figure 4 Enlarged view at B in;

[0025] Figure 7The utility model Figure 4 The enlarged view at position C in the utility model

[0026] In the figure: ultrasonic transducer 1, main clamping plate component 2, auxiliary clamping plate component 3, arc plate 4, guide rod 5, first connecting plate 6, bolt 7, positioning block 8, observation hole 801, pointer 802, fastening mechanism 9, screw rod 901, first slider 902, square sleeve 903, second connecting plate 904, first spring 905, second slider 906, connecting rod 10, mounting plate 11, notch 12, third slider 13, ball 14, control rod 15, second spring 16, limiting block 17, through hole 18, coupling frame 19 Specific implementation mode

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model

[0028] Please refer to Figures 1 to 7 , the present utility model provides a technical solution: a gas-liquid two-phase mass flowmeter, including an ultrasonic transducer 1 and a mounting mechanism. The mounting mechanism includes a main clamping plate component 2 and an auxiliary clamping plate component 3. The main clamping plate component 2 includes an arc plate 4. There are two groups of arc plates 4. The two ends of the arc plate 4 are respectively sleeved on the guide rod 5 and form a sliding connection, and the sliding connection points on the same arc plate 4 are symmetrical. The ends of the guide rod 5 on the same group of arc plates 4 are fixedly connected through a first connecting plate 6. A threaded hole is opened at the center of the first connecting plate 6 and is threadedly connected with a bolt 7. The bolt 7 passes through the first connecting plate 6 and is rotatably connected to the arc plate 4. The two groups of arc plates 4 are connected through a connecting rod 10. There are two groups of connecting rods 10 and they are parallel. The end of the connecting rod 10 passes through the positioning block 8 and forms a sliding connection with the positioning block 8. Scale lines are provided on the circumferential surface of the connecting rod 10. An observation hole 801 is opened on the positioning block 8. The middle dividing plane of the observation hole 801 is coplanar with the middle dividing plane of the positioning block 8. A pointer 802 is arranged in the observation hole 801. One end of the pointer 802 is fixedly connected to the observation hole 801 and the pointer 802 is located in the observation hole 801. When the positioning block 8 slides on the connecting rod 10, the distance between the positioning blocks 8 on the main clamping plate component 2 and the auxiliary clamping plate component 3 can be determined through the pointer 802 and the scale lines. A fastening mechanism 9 for pressing and fixing the ultrasonic transducer 1 is arranged at the center of the positioning block 8

[0029] The fastening mechanism 9 includes a screw rod 901. The screw rod 901 is threadedly connected to the positioning block 8 and passes through the positioning block 8 and then is fixedly connected to the first slider 902. The first slider 902 is slidably arranged in the inner cavity of the square sleeve 903. The square sleeve 903 is fixedly connected to the positioning block 8. In order to ensure accurate positioning, a second connecting plate 904 is further provided. The second connecting plate 904 is fixedly connected to the first connecting plate 6 through a connecting block. A strip-shaped through hole is opened on the second connecting plate 904. The square sleeve 903 passes through the strip-shaped through hole and is slidably connected thereto. The lower end of the first slider 902 is fixedly connected to the upper end of the first spring 905. The lower end of the first spring 905 is fixedly connected to the second slider 906. The second slider 906 is slidably arranged in the inner cavity of the square sleeve 903. The lower end of the second slider 906 is fixedly connected to the mounting plate 11. The ultrasonic transducer 1 is mounted on the mounting plate 11. Here, the length of the second slider 906 is as long as possible to ensure precise positioning.

[0030] The ultrasonic transducer 1 is detachably mounted on the mounting plate 11 through the cooperation of a chute and a slide rail. The specific structure is as follows: Two groups of chutes are opened on the mounting plate 11. The chutes penetrate the mounting plate 11 horizontally. Slide rails corresponding to and adapted to the chutes are provided on the mounting surface of the ultrasonic transducer 1. A notch 12 is opened on the outer side surface of the slide rail. The symmetry plane of the notch 12 is coplanar with the middle plane of the ultrasonic transducer 1. A sliding cavity is opened in the mounting plate 11. The sliding cavity communicates with the chute. The middle plane of the sliding cavity is coplanar with the middle plane of the mounting plate 11. A third slider 13 is slidably arranged in the sliding cavity. A ball 14 is provided on one end surface of the third slider 13. The other end of the third slider 13 is rotatably connected to a control rod 15. A second spring 16 is sleeved on the control rod 15. The other end of the control rod 15 passes through the sliding cavity and is fixedly connected to a cross bar. A limiting block 17 is fixedly arranged on the side surface of the control rod 15. A through hole 18 through which the limiting block 17 can pass is opened on the mounting plate 11.

[0031] A groove is opened on the radiation surface of the ultrasonic transducer 1. A coupling frame 19 is embedded in the groove. Coupling paste is filled in the coupling frame 19. A film is sealed on the lower end surface of the coupling frame 19. The surface of the coupling frame 19 in contact with the pipeline is an arc surface. The diameter of the arc surface is the same as the diameter of the pipeline. The groove and the frame body of the coupling frame 19 are matched so that the coupling frame 19 can be detachably embedded in the groove. Corresponding coupling frames 19 can be replaced for pipelines with different diameters. It should be noted that the height of the coupling frame 19 should be appropriate. After the coupling frame 19 is installed on the ultrasonic transducer 1, the distance between the radiation surface of the ultrasonic transducer 1 and the arc surface at the lower end of the coupling frame 19 is as small as possible to reduce the thickness of the coupling paste between the ultrasonic transducer and the pipeline.

[0032] The coupling frame needs to have good acoustic performance and at the same time have good resilience and be able to maintain long-term stability. In this application, polyurethane, Teflon, silicone, etc. can be used.

[0033] A rubber pad is provided on the arc-shaped plate 4 to increase the contact surface between the arc-shaped plate 4 and the pipeline during fixation.

[0034] The difference between the auxiliary splint component 3 and the main splint component 2 is that the arc-shaped plate 4 of the auxiliary splint component 3 is fixedly connected to the guide rod 5, which means that the arc-shaped plate 4 on the auxiliary splint component 3 is fixed and cannot slide on the guide rod 5. Of course, there is no need to set the bolt 7 anymore.

[0035] The main splint component 2 and the auxiliary splint component 3 are connected by a threaded sleeve at the end of the guide rod 5.

[0036] When using the present utility model, first embed the coupling frame 19 into the groove on the installation surface of the ultrasonic transducer 1, so that the emission surface of the ultrasonic transducer 1 is closely attached to the coupling paste. Then align the slide rail with the slide groove and insert it. Then rotate the control rod 15 so that the limit block 17 aligns with the upper through hole 18. Under the action of the second spring 16, the end of the third slider 13 provided with the ball 14 will contact the side surface of the guide rail, and the guide rail continues to slide in the slide groove until the end of the third slider 13 is stuck into the notch 12 on the guide rail and positioned. Then, place the main splint component 2 and the auxiliary splint component 3 on both sides of the pipeline and lock them through the threaded sleeve. Then, use a torque wrench to tighten the bolt 7, the arc-shaped plate 4 clamps the pipeline tightly. Then move the positioning block 8, and make the distance between the fastening mechanisms 9 meet the installation requirements through the scale line on the connecting rod 10 and the pointer 802 in the observation hole 801. Then tear off the film on the lower end surface of the coupling frame 19, rotate the screw rod 901, push the first slider 902, and push the second slider 906 and the mounting plate 11 close to the pipeline through the first spring 905. Finally, the arc surface of the coupling frame 19 is closely attached to the pipeline and sealed, and the connection line is completed for installation. It should be noted that before installation, the part of the pipeline to be installed should be cleaned and derusted.

[0037] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid two-phase mass flowmeter, comprising an ultrasonic transducer (1) and a mounting mechanism, the mounting mechanism comprising a main clamping plate component (2) and a secondary clamping plate component (3), characterized in that: The main splint component (2) includes an arc-shaped plate (4). There are two groups of the arc-shaped plates (4). The two ends of the arc-shaped plate (4) are respectively sleeved on the guide rods (5) to form a sliding connection. The ends of the guide rods (5) on the same group of the arc-shaped plates (4) are fixedly connected through a first connecting plate (6). A threaded hole is opened at the center of the first connecting plate (6) and is threadedly connected with a bolt (7). The bolt (7) passes through the first connecting plate (6) and is rotatably connected to the arc-shaped plate (4). The guide rods (5) between the two groups of the arc-shaped plates (4) are connected through a connecting rod (10). The connecting rod (10) is in two groups and is parallel. A positioning block (8) is slidably connected between the two groups of the connecting rods (10). A fastening mechanism (9) for pressing and fixing the ultrasonic transducer (1) is provided at the center of the positioning block (8). The difference between the auxiliary splint component (3) and the main splint component (2) is that the arc-shaped plate (4) of the auxiliary splint component (3) is fixedly connected to the guide rod (5). The main splint component (2) and the auxiliary splint component (3) are connected through a threaded sleeve.

2. The gas-liquid two-phase mass flowmeter according to claim 1, wherein: The fastening mechanism (9) includes a screw rod (901). The screw rod (901) is threadedly connected to the positioning block (8) and passes through the positioning block (8) and then is fixedly connected to a first slider (902). The first slider (902) is slidably arranged in the inner cavity of a square sleeve (903). The square sleeve (903) is fixedly connected to the positioning block (8). The lower end of the first slider (902) is fixedly connected to the upper end of a first spring (905). The lower end of the first spring (905) is fixedly connected to a second slider (906). The second slider (906) is slidably arranged in the inner cavity of the square sleeve (903). The lower end of the second slider (906) is fixedly connected to a mounting plate (11). The ultrasonic transducer (1) is mounted on the mounting plate (11).

3. The gas-liquid two-phase mass flowmeter according to claim 2, characterized in that: Two chutes are opened on the mounting plate (11). The chutes run through the mounting plate (11) horizontally. Slide rails corresponding to and adapted to the chutes are provided on the mounting surface of the ultrasonic transducer (1). A notch (12) is opened on the outer side surface of the slide rail. The symmetry plane of the notch (12) is coplanar with the middle plane of the ultrasonic transducer (1). A sliding cavity is opened in the mounting plate (11). The sliding cavity communicates with the chutes and is coplanar with the middle plane of the mounting plate (11). A third slider (13) is slidably arranged in the sliding cavity. A ball (14) is provided on one end surface of the third slider (13). The other end of the third slider (13) is rotatably connected to a control rod (15). A second spring (16) is sleeved on the control rod (15). The other end of the control rod (15) passes through the sliding cavity and is fixedly connected to a cross bar. A limiting block (17) is fixedly arranged on the circumferential surface of the control rod (15). A through hole (18) through which the limiting block (17) can pass is opened on the mounting plate (11).

4. The gas-liquid two-phase mass flowmeter according to claim 3, wherein: A groove is formed on the radiation surface of the ultrasonic transducer (1), a coupling frame (19) is embedded in the groove, a coupling paste is filled in the coupling frame (19), and a film is sealed on the lower end surface of the coupling frame (19).

5. The gas-liquid two-phase mass flowmeter according to claim 4, characterized in that: The surface of the coupling frame (19) in contact with the pipeline is an arc surface, and the diameter of the arc surface is the same as the diameter of the pipeline.

6. The gas-liquid two-phase mass flowmeter according to claim 1, wherein: A scale is provided on the connecting rod (10), an observation hole (801) is formed on the positioning block (8), the middle dividing plane of the observation hole (801) is coplanar with the middle dividing plane of the positioning block (8), a pointer (802) is arranged in the observation hole (801), and one end of the pointer (802) is fixedly connected to the side wall of the observation hole (801).

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