Temperature and pressure compensation type vortex shedding flowmeter

Abstract

The utility model relates to the field of flow meters, in particular to a temperature and pressure compensation type vortex shedding flow meter which comprises a display screen, a butt joint pipe and a flow blocking assembly arranged in the butt joint pipe, the flow blocking assembly comprises a shell, a pressed part and a movable plate, a sealing frame is further arranged in the shell, and a telescopic rod is fixed to one face of the pressed part. One end of the telescopic rod is connected with a sensor fixed in the shell, a rotating rod is arranged in the sealing frame, when the pressed part moves, the telescopic rod is compressed, and after the sensor at one end of the telescopic rod is pressed, the rotating rod starts to rotate to drive the moving plate to unfold towards the two sides of the shell, so that the area of the contact surface between the flow blocking assembly and fluid is increased; in this way, the circulation gap in the butt joint pipe is reduced, then the pressure of the contact face of the fluid and the butt joint pipe is increased, finally, the fluid flowing too slowly moves in an accelerated mode when passing through the flow blocking assembly, the pressure compensation function is achieved, and a stable vortex street phenomenon is formed at the tail of the flow blocking assembly.

Description

Technical Field

[0001] The utility model relates to the field of flow meters, in particular to a temperature and pressure compensated vortex flow meter. Background Art

[0002] A vortex flow meter is a commonly used flow measurement instrument. Among vortex flow meters, there is a temperature and pressure compensated vortex flow meter, which is mostly used to measure the flow rate of gases. It adds temperature and pressure compensation functions to the basic structure of the vortex flow meter. The temperature and pressure compensated vortex flow meter measures the temperature and pressure of the medium in real time through built-in temperature and pressure sensors, and corrects the flow rate according to these data, thereby improving the measurement accuracy and stability.

[0003] The existing temperature and pressure compensated vortex flow meter utilizes the principle that vortices are generated when the fluid passes through the baffle. The flow rate of the fluid can be measured by the number of vortices. This principle is called the Karman vortex street principle. However, when facing fluids with different properties and flow characteristics, a single baffle cannot efficiently and accurately detect the fluid flow rate. For example, when the fluid flow rate is too slow or the fluid density is large, the number and frequency of vortices passing through the baffle will adaptively decrease. When reaching a critical value, the fluid passing through the baffle will not form vortices, thus affecting the actual measurement effect. Summary of the Utility Model

[0004] In view of this, the purpose of the present utility model is to provide a temperature and pressure compensated vortex flow meter to solve the technical problem that a single baffle in the existing temperature and pressure compensated vortex flow meter cannot efficiently and accurately detect the fluid flow rate when facing fluids with different properties and flow characteristics.

[0005] Based on the above purpose, the present utility model provides a temperature and pressure compensated vortex flow meter, which includes a display screen and a docking pipe fixedly arranged below the display screen, and a flow blocking component arranged inside the docking pipe for creating a vortex street phenomenon.

[0006] The flow blocking component includes a housing, a pressure receiving member movably arranged inside the housing for contacting the fluid, and a moving plate for changing the shape of the flow blocking component. A sealing frame for isolating the external fluid is also arranged inside the housing.

[0007] One side of the pressure receiving member is fixed with a telescopic rod, and one end of the telescopic rod is connected with a sensor fixed inside the housing.

[0008] A rotating rod for driving the moving plate to move is rotatably arranged inside the sealing frame.

[0009] Preferably, a spring is sleeved outside the telescopic rod, and a pressing plate for connecting with the sensor is fixedly arranged at one end of the telescopic rod.

[0010] Preferably, a partition board is fixedly arranged inside the outer shell, a sleeve is threadedly installed on the surface of the partition board, and the pressure-receiving member includes a contact plate and a guide rod fixed on the surface of the contact plate for docking with the sleeve.

[0011] Preferably, a motor is also threadedly connected to the surface of the partition board, a worm is fixedly connected to the output end of the motor, and a gear for meshing with the worm is fixedly arranged at the end of the rotating rod.

[0012] Preferably, there are two groups of rotating rods, and teeth with different heights are arranged on the surfaces of the two groups of rotating rods. A rack for meshing with the teeth is fixedly arranged on the inner side surface of the moving plate.

[0013] Preferably, inclined surfaces for fitting with the inner wall of the moving plate are formed by cutting on both sides of the sealing frame, through grooves are also opened on both sides of the sealing frame, and a skirt is also arranged on the surface of the sealing frame.

[0014] Preferably, extension plates are arranged at both ends of the moving plate, and the extension plate at one end is attached to the sealing frame.

[0015] Preferably, covers are assembled on both the upper and lower surfaces of the outer shell.

[0016] Preferably, a first notch and a second notch for the contact plate and the moving plate to enter and exit are formed on the surface of the outer shell.

[0017] Preferably, a fixing plate for fixing it on the partition board is arranged at one end of the sensor.

[0018] The beneficial effects of the present utility model:

[0019] When the pressure-receiving member moves in the present utility model, the telescopic rod is compressed. After the sensor at one end of the telescopic rod is pressed, the rotating rod starts to rotate, driving the moving plate to expand towards both sides of the outer shell, thereby increasing the contact area between the flow-blocking component and the fluid. This also makes the flow gap inside the butt joint pipe decrease, and then increases the pressure on the contact surface between the fluid and the butt joint pipe. Finally, the fluid with too slow flow can accelerate when passing through the flow-blocking component, realizing the pressure compensation function and forming a stable vortex street phenomenon at the tail of the flow-blocking component. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only those of the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0022] Figure 2 Schematic half-sectional structure diagram of the present utility model;

[0023] Figure 3 Schematic structure diagram of the flow-blocking component of the present utility model;

[0024] Figure 4 Schematic structure diagram of the outer shell of the present utility model;

[0025] Figure 5 Schematic structure diagram of the pressure-receiving member of the present utility model;

[0026] Figure 6 Schematic diagram of the moving plate and the rotating rod of the present utility model Figure 1 ;

[0027] Figure 7 Schematic structure diagram of the sealing frame of the present utility model;

[0028] Figure 8 Schematic diagram of the moving plate and the rotating rod of the present utility model Figure 2 ;

[0029] Figure 9 Schematic diagram of the working state of the present utility model Figure 1 ;

[0030] Figure 10 Schematic diagram of the working state of the present utility model Figure 2 .

[0031] The reference numerals in the figure are:

[0032] 1, display screen; 11, docking pipe; 2, flow-blocking component; 21, outer shell; 211, partition plate; 212, sleeve; 213, first notch; 214, second notch; 22, cover; 23, pressure-receiving member; 231, contact plate; 232, guide rod; 233, telescopic rod; 2331, pressing plate; 234, spring; 235, sensor; 236, fixing plate; 24, moving plate; 241, rack; 242, extension plate; 25, sealing frame; 251, inclined surface; 252, through groove; 253, skirt; 26, motor; 261, worm; 27, rotating rod; 271, gear; 272, tooth. Detailed implementation manners

[0033] In order to make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with specific embodiments.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this utility model should have the ordinary meanings understood by those with general skills in the field to which this utility model belongs. The "first", "second" and similar words used in this utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0035] To further understand this utility model, the following will describe this utility model in detail with reference to the accompanying drawings.

[0036] Combined with Figures 1 - 7 , and Figure 9 and Figure 10 , this utility model provides a temperature and pressure compensated vortex flowmeter, which includes a display screen 1 and a docking pipe 11 fixedly arranged below the display screen 1, and a flow blocking component 2 arranged inside the docking pipe 11 for creating a vortex street phenomenon;

[0037] The flow blocking component 2 includes a housing 21, a pressure-receiving member 23 movably arranged inside the housing 21 for contacting the fluid, and a moving plate 24 for changing the shape of the flow blocking component 2. A sealing frame 25 for isolating the external fluid is also arranged inside the housing 21;

[0038] One side of the pressure-receiving member 23 is fixed with a telescopic rod 233, and one end of the telescopic rod 233 is connected to a sensor 235 fixed inside the housing 21;

[0039] A rotating rod 27 for driving the moving plate 24 to move is rotatably arranged inside the sealing frame 25;

[0040] In this embodiment, when the fluid flow rate inside the pipeline is too slow, when the fluid passes through the butt joint 11 and impacts the flow blocking component 2, the pressure-bearing member 23 begins to move under the force, and the telescopic rod 233 is compressed at the same time. After the sensor 235 at one end of the telescopic rod 233 is compressed, it transmits the current pressure data of the fluid to the display screen 1, and then the rotating rod 27 begins to rotate, driving the movable plate 24 to expand toward both sides of the shell 21, thereby increasing the contact surface area between the flow blocking component 2 and the fluid, which also reduces the flow gap inside the butt joint 11, thereby increasing the contact surface pressure between the fluid and the butt joint 11, and finally enables the fluid that flows too slowly to accelerate when passing through the flow blocking component 2, realizing the pressure compensation function, and forming a stable vortex street phenomenon at the tail of the flow blocking component 2. It should be noted that the sensor 235 can select a sensor 235 with a temperature and pressure detection function. The sensor 235 is a prior art and will not be described in detail again.

[0041] Furthermore, when the fluid flow rate inside the pipeline is too fast, the sensor 235 is pressurized and analyzes the current pressure, and then the rotating rod 27 rotates, causing the movable plate 24 to shrink a short distance toward the inside of the shell 21 to form a notch. When the fluid flows through the notch, the volume of the fluid in this section increases adaptively and its internal pressure decreases, thereby reducing its own flow rate and avoiding the frequency of the vortex street phenomenon at the tail of the flow-blocking component 2 being too fast, which makes the vortex flowmeter unable to accurately detect the flow.

[0042] Combination Figure 5 The outer periphery of the telescopic rod 233 is provided with a spring 234, and one end of the telescopic rod 233 is fixedly provided with a pressure plate 2331 connected to the sensor 235;

[0043] In this embodiment, when the telescopic rod 233 is shortened, the pressure-bearing member 23 simultaneously squeezes the spring 234 to compress it. When the fluid stops flowing, the spring rebounds to reset the pressure-bearing member 23 and the telescopic rod 233. The pressure plate 2331 at one end of the telescopic rod 233 is used to increase the contact area between the telescopic rod 233 and the sensor 235 to avoid excessive pressure at a point on the surface of the sensor 235, which would cause the sensor 235 to obtain erroneous pressure data.

[0044] Combination Figure 4 and Figure 5 A partition plate 211 is fixedly arranged inside the housing 21, a sleeve 212 is threadedly installed on the surface of the partition plate 211, and the pressure-bearing member 23 includes a contact plate 231 and a guide rod 232 fixed on the surface of the contact plate 231 for docking with the sleeve 212;

[0045] In this embodiment, the partition plate 211 divides the internal space of the housing 21 into two parts, and there are multiple groups of mounting holes on the surface of the partition plate 211 for mounting the required components. The cavity of one part is used to accommodate the pressure-receiving member 23, the moving plate 24, and the rotating rod 27, and the cavity of the other part is used to accommodate the multiple groups of components that can be detachably mounted on the partition plate 211. The multiple groups of components can be selected according to the actual use of the vortex flowmeter. For example, a buzzer can be selected to give an alarm or a communication main board can be installed to realize real-time monitoring of the remote PC side;

[0046] Further, when the pressure-receiving member 23 is under pressure, the contact plate 231 will move. During the movement of the contact plate 231, the guide rod 232 will enter the sleeve 212 to realize the guiding and limiting of the contact plate 231 and prevent the contact plate 231 from shifting in position.

[0047] Combined with Figure 6 , a motor 26 is also threadedly connected to the surface of the partition plate 211. The output end of the motor 26 is fixedly connected to a worm 261, and a gear 271 for meshing with the worm 261 is fixedly arranged at the end of the rotating rod 27;

[0048] In this embodiment, after the above sensor 235 detects the pressure, it will send a set of electrical signals to the motor 26 to start the motor 26 and drive the worm 261 connected to its output end to rotate. The rotating worm 261 causes the rotating rod 27 to rotate by combining with the gear 271 fixed at the end of the rotating rod 27.

[0049] Combined with Figure 6 and Figure 8 , there are two groups of the rotating rods 27, and the surfaces of the two groups of rotating rods 27 are both provided with teeth 272 of different heights. A rack 241 for meshing with the teeth 272 is fixedly arranged on the inner side surface of the moving plate 24;

[0050] In this embodiment, when the rotating rod 27 rotates, the two groups of rotating rods 27 rotate in opposite directions. The teeth 272 arranged on the surface of the rotating rod 27 can push the rack 241 to perform a linear motion, thereby pushing the moving plate 24 to move. The teeth 272 of different heights can prevent the multiple groups of racks 241 from limiting each other.

[0051] Combined with Figure 7 , both sides of the sealing frame 25 are cut and formed with inclined surfaces 251 for fitting with the inner wall of the moving plate 24. Through grooves 252 are also opened on both sides of the sealing frame 25, and a skirt 253 is also provided on the surface of the sealing frame 25;

[0052] In this embodiment, the sealing frame 25 is made of a soft rubber material. When the two moving plates 24 approach each other, the sealing frame 25 does not affect the movement of the moving plates 24. The inclined surfaces 251 on both sides of the sealing frame 25 can prevent the sealing frame 25 from affecting the movement of the moving plates 24. The skirt 253 on the surface of the sealing frame 25 is used to fit the outer shell 21, making the connection between the sealing frame 25 and the outer shell 21 closer.

[0053] Combined with Figures 7 - 10 , extension plates 242 are provided at both ends of the moving plate 24, and the extension plate 242 at one end is attached to the sealing frame 25;

[0054] In this embodiment, the provision of the extension plates 242 can prevent external fluid from entering the outer shell 21 when the moving plates 24 move outward or inward, thereby extending the service life of the flow-blocking assembly 2.

[0055] Combined with Figure 3 , covers 22 are assembled on both the upper and lower surfaces of the outer shell 21;

[0056] In this embodiment, the covers 22 can be freely disassembled. After removing the covers 22, the components inside the outer shell 21 can be disassembled, assembled, and replaced.

[0057] Combined with Figure 4 , first slots 213 and second slots 214 for the access of the contact plate 231 and the moving plate 24 are provided on the surface of the outer shell 21;

[0058] In this embodiment, the skirt on the surface of the sealing frame 25 can fit with the first slot 213, enhancing the sealing performance of the sealing frame 25. The provisions of the first slot 213 and the second slot 214 ensure the normal movement of the contact plate 231 and the moving plate 24.

[0059] Combined with Figure 5 , a fixing plate 236 for fixing one end of the sensor 235 to the partition plate 211 is provided;

[0060] The fixing plate 236 is provided with screw holes, and the fixing plate 236 and the sensor 235 can be fixedly installed on the partition plate 211 through screws.

[0061] Those of ordinary skill in the art should understand that: The discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0062] The present utility model aims to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Temperature and pressure compensated vortex flowmeter, including a display screen and a docking pipe fixedly arranged below the display screen, characterized in that, It includes a flow-blocking component arranged inside the docking pipe for creating a vortex street phenomenon; The flow-blocking component includes a housing, inside which a pressure-receiving member for contacting the fluid and a moving plate for changing the shape of the flow-blocking component are movably arranged. A sealing frame for isolating the external fluid is also provided inside the housing; A telescopic rod is fixed on one side of the pressure-receiving member, and one end of the telescopic rod is connected to a sensor fixed inside the housing; A rotating rod for driving the moving plate to move is rotatably arranged inside the sealing frame.

2. The temperature and pressure compensated vortex flowmeter according to claim 1, characterized in that, A spring is sleeved around the telescopic rod, and a pressing plate for connecting with the sensor is fixedly arranged at one end of the telescopic rod.

3. The temperature and pressure compensated vortex flowmeter according to claim 1, wherein A partition plate is fixedly arranged inside the housing, and a sleeve is threadedly installed on the surface of the partition plate. The pressure-receiving member includes a contact plate and a guide rod fixed on the surface of the contact plate for docking with the sleeve.

4. The temperature and pressure compensated vortex flowmeter according to claim 3, characterized in that, A motor is also threadedly connected to the surface of the partition plate, the output end of the motor is fixedly connected with a worm, and a gear for meshing with the worm is fixedly arranged at the end of the rotating rod.

5. The temperature and pressure compensated vortex flowmeter according to claim 4, wherein There are two groups of rotating rods, and teeth with different heights are arranged on the surfaces of the two groups of rotating rods. A rack for meshing with the teeth is fixedly arranged on the inner side surface of the moving plate.

6. The temperature and pressure compensated vortex flowmeter according to claim 5, wherein Bevels for fitting with the inner wall of the moving plate are formed by cutting on both sides of the sealing frame, through grooves are also opened on both sides of the sealing frame, and a skirt is also provided on the surface of the sealing frame.

7. The temperature and pressure compensated vortex flowmeter according to claim 6, wherein Extension plates are arranged at both ends of the moving plate, and the extension plate at one end is attached to the sealing frame.

8. The temperature and pressure compensated vortex flowmeter according to claim 1, wherein Cover plates are assembled on the upper and lower surfaces of the housing.

9. The temperature and pressure compensated vortex flowmeter according to claim 1, characterized in that, First notches and second notches for the contact plate and the moving plate to enter and exit are opened on the surface of the housing.

10. The temperature and pressure compensated vortex flowmeter according to claim 2, characterized in that, A fixing plate for fixing it on the partition plate is arranged at one end of the sensor.

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