An anti-interference vortex flow meter

Abstract

This invention belongs to the field of flow meter technology, and specifically relates to an anti-interference vortex flow meter, comprising an installation pipe, a meter body, two piezoelectric sensors, and a triangular prism. The triangular prism is disposed inside the feed end of the installation pipe, and the two piezoelectric sensors are both disposed downstream of the triangular prism. The meter body is detachably connected to the installation pipe. It also includes two sealing covers, which are respectively fixedly inserted into the upper and lower walls of the installation pipe, and are coaxial with the triangular prism. Each of the two sealing covers has a rubber sleeve fixed at one facing end inside, and the triangular prism is slidably connected to the inner wall of the rubber sleeve. This invention can prevent impurities from affecting vortex generation, reducing the adverse effects on detection accuracy, and can assist the piezoelectric sensors in rapid heat dissipation and cooling, reducing zero-point drift caused by high temperatures, and further improving detection accuracy.

Description

Technical Field

[0001] This invention belongs to the field of flow meter technology, and in particular relates to an anti-interference vortex flow meter. Background Technology

[0002] As a core device for industrial fluid measurement, vortex flow meters are widely used in key fields such as petrochemicals, power, municipal water affairs, and new energy, thanks to their advantages such as simple structure, low pressure loss, and wide applicability to various media.

[0003] Vortex flow meters utilize vortex generators such as triangular prisms to create regular vortices in the downstream flow of fluid. By detecting the shedding frequency of these vortices, the flow rate can be calculated. However, during operation, the medium directly impacts the flow-facing plane of the triangular prism. Under the pressure of the medium's flow, impurities carried in the medium may become trapped and deposited on the flow-facing plane. Over time, this can alter the actual flow-facing area of ​​the vortex generator or cause the flow-facing surface to become uneven, leading to a shift in the Karman vortex street's separation point and instability in the Strouhal number. Ultimately, this affects the flow meter's measurement accuracy and monitoring performance. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing an anti-interference vortex flow meter.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an anti-interference vortex flow meter, comprising an installation pipe, a meter body, two piezoelectric detection sensors, and a triangular prism, wherein the triangular prism is disposed inside the feed end of the installation pipe, and both piezoelectric detection sensors are disposed downstream of the triangular prism; the meter body is detachably connected to the installation pipe, and further comprising: Two sealing covers are fixedly inserted into the upper and lower pipe walls of the installation pipe, respectively. The two sealing covers are coaxial with the triangular prism. A rubber sleeve is fixed at one end of each sealing cover facing each other. The triangular prism is slidably connected to the inner wall of the rubber sleeve. A drive unit is mounted on the top of the upper sealing cover, and the drive unit drives the triangular prism to move coaxially along the sealing cover; A heat-conducting mounting mechanism is installed inside the installation pipe, and both piezoelectric detection sensors are connected to the meter body through the heat-conducting mounting mechanism.

[0006] In the aforementioned anti-interference vortex flowmeter, the drive unit includes a mounting sleeve fixed to the top of the upper sealing cover. A mounting plate is detachably mounted on the top of the mounting sleeve. A motor is fixed to the top of the mounting plate, and the output end of the motor is rotatably connected to the mounting plate. A reciprocating screw assembly is installed inside both sealing covers. The triangular prism moves coaxially along the inside of the sealing cover through the reciprocating screw assembly. The output end of the motor is driven by the reciprocating screw assembly, and the motor is electrically connected to the meter head body.

[0007] In the aforementioned anti-interference vortex flow meter, the heat-conducting mounting mechanism includes a ceramic-metal composite plate fixed to the mounting end of the meter body. The ceramic-metal composite plate has mounting grooves on its two opposite side walls, and a piezoelectric detection sensor is fixed inside the corresponding mounting groove. The ceramic-metal composite plate has heat exchange holes inside, and an air guide assembly connected to the heat exchange holes is installed on the inner side of the mounting sleeve.

[0008] In the aforementioned anti-interference vortex flow meter, the air guide assembly includes a fan impeller fixedly sleeved on the motor output end. The side wall of the mounting sleeve has several air inlet holes on one side of the fan impeller's suction end. An air supply pipe is fixedly inserted into the side wall of the mounting sleeve on one side of the fan impeller's exhaust end, and the air supply pipe is connected to the interior of the heat exchange hole. The exhaust end of the heat exchange hole is fixedly connected to an exhaust pipe, and the exhaust end of the exhaust pipe extends to the outside of the mounting pipe.

[0009] In the aforementioned anti-interference vortex flowmeter, the output end of the motor is fixed with an electromagnetic clutch, and the end of the electromagnetic clutch away from the motor is connected to the reciprocating lead screw assembly for transmission. The electromagnetic clutch is electrically connected to the meter head body.

[0010] In the aforementioned anti-interference vortex flow meter, an encoder is fixed to the bottom of the mounting plate, and the rotating end of the encoder is connected to the output end of the motor. The encoder is used to monitor the number of rotations of the motor output end. The meter head body controls the output power of the motor based on the electrical signals fed back by two piezoelectric detection sensors, and the meter head body controls the operation of the electromagnetic clutch based on the electrical signals fed back by the encoder.

[0011] In the aforementioned anti-interference vortex flow meter, at least two limiting slide rods are fixed inside the lower sealing cover, and both limiting slide rods are slidably connected to the triangular prism.

[0012] In the aforementioned anti-interference vortex flow meter, a conical column is fixed to the top of the limiting slide rod, and the top of the conical column is fixed inside the sealing cover on the same side. A conical snap-fit ​​groove matching the conical column is provided on the top of the triangular column.

[0013] Compared with existing technologies, the advantages of an anti-interference vortex flow meter are: 1. Through the coordinated operation of the installation pipe, meter body, piezoelectric detection sensor, triangular prism, sealing cover, rubber sleeve, and drive unit, impurities, dirt, and scale adhering to the flow-facing surface of the triangular prism can be removed online in real time. This avoids problems such as deformation of the body contour, disordered vortex shedding, and attenuation of detection signal caused by long-term accumulation of impurities, effectively ensuring the stable and regular generation of vortex, significantly reducing the measurement error caused by impurity adhesion, and improving the stability and detection accuracy of the flow meter in long-term operation.

[0014] 2. Through the heat-conducting installation mechanism, it can work in conjunction with the drive unit to effectively reduce the temperature rise caused by the conduction of high-temperature medium, suppress the sensitivity drift and signal distortion of the sensor caused by high temperature, avoid zero-point fluctuation and measurement deviation caused by high temperature, and significantly improve the working stability and measurement accuracy under high temperature conditions.

[0015] 3. Through the cooperation of the electromagnetic clutch and encoder, the cleaning action of the impurities on the surface of the triangular column can be intelligently triggered according to the actual flow rate of the medium, so as to achieve automatic, timely and on-demand cleaning, effectively reduce the energy consumption of the drive unit, reduce its operating load, ensure timely and reliable cleaning of impurities, and improve the automation level and long-term operational stability of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an anti-interference vortex flowmeter provided by the present invention; Figure 2 This is a schematic diagram of the internal structure of the installation pipe of an anti-interference vortex flowmeter provided by the present invention; Figure 3 This is a schematic diagram of the connection structure between the sealing cover and the triangular prism of an anti-interference vortex flowmeter provided by the present invention; Figure 4 This invention provides an anti-interference type vortex flowmeter. Figure 1 Enlarged view of the structure of section A; Figure 5 This is a schematic diagram of the drive unit of an anti-interference vortex flowmeter provided by the present invention; Figure 6 This is a schematic diagram of the internal structure of a ceramic-metal composite plate for an anti-interference vortex flowmeter provided by the present invention; Figure 7 This invention provides an anti-interference type vortex flowmeter. Figure 3 Enlarged view of the structure of part B.

[0017] In the diagram: 1. Installation pipe, 2. Meter body, 3. Piezoelectric detection sensor, 4. Triangular column, 5. Sealing cover, 6. Rubber sleeve, 7. Drive unit, 71. Mounting sleeve, 72. Mounting plate, 73. Motor, 74. Reciprocating screw assembly, 8. Heat-conducting mounting mechanism, 81. Ceramic-metal composite plate, 82. Heat exchange hole, 9. Air guide assembly, 91. Fan impeller, 92. Air inlet, 93. Air supply pipe, 94. Air exhaust pipe, 10. Electromagnetic clutch, 11. Encoder, 12. Limiting slide bar, 13. Conical column. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] like Figures 1-7 As shown, an anti-interference vortex flow meter includes an installation pipe 1, a meter body 2, two piezoelectric sensors 3, and a triangular prism 4. The triangular prism 4 is disposed inside the inlet end of the installation pipe 1, and the two piezoelectric sensors 3 are disposed downstream of the triangular prism 4. The meter body 2 is detachably connected to the installation pipe 1. The meter also includes two sealing covers 5, which are fixedly inserted into the upper and lower walls of the installation pipe 1, respectively, and are coaxial with the triangular prism 4. A rubber sleeve 6 is fixed to one end of each sealing cover 5 facing each other, and the triangular prism 4 is slidably connected to the inner wall of the rubber sleeve 6. A drive unit 7 is mounted on the top of the upper sealing cover 5, and the drive unit 7 drives the triangular prism 4 along the sealing cover 5. The shaft moves, and the drive unit 7 includes a mounting sleeve 71 fixed to the top of the upper sealing cover 5. A mounting plate 72 is detachably mounted on the top of the mounting sleeve 71. A motor 73 is fixed to the top of the mounting plate 72, and the output end of the motor 73 is rotatably connected to the mounting plate 72. A reciprocating screw assembly 74 is installed inside both sealing covers 5. The triangular prism 4 moves coaxially along the inside of the sealing cover 5 through the reciprocating screw assembly 74. The output end of the motor 73 is connected to the reciprocating screw assembly 74. The motor 73 is electrically connected to the meter body 2. The reciprocating screw assembly 74 includes components such as a reciprocating screw, a screw nut, and a sealed bearing. Under the action of the reciprocating screw assembly 74, the triangular prism 4 can slide stably along the inside of the sealing cover 5.

[0020] The heat-conducting mounting mechanism 8 is located inside the installation pipe 1, and both piezoelectric detection sensors 3 are connected to the meter body 2 through the heat-conducting mounting mechanism 8. The heat-conducting mounting mechanism 8 includes a ceramic-metal composite plate 81 fixed to the mounting end of the meter body 2. The ceramic-metal composite plate 81 has mounting grooves on its two opposite sidewalls, and the piezoelectric detection sensors 3 are fixed inside the corresponding mounting grooves. Heat exchange holes 82 are provided inside the ceramic-metal composite plate 81. An air guide assembly 9 connected to the heat exchange holes 82 is installed on the inner side of the mounting sleeve 71. The air assembly 9 includes a fan impeller 91 fixedly sleeved on the output end of the motor 73. The side wall of the mounting sleeve 71 is provided with several air inlet holes 92 on the side of the fan impeller 91 at the air intake end. An air supply pipe 93 is fixedly inserted into the side wall of the mounting sleeve 71 on the side of the fan impeller 91 at the air exhaust end. The air supply pipe 93 is connected to the interior of the heat exchange hole 82. The air outlet end of the heat exchange hole 82 is fixedly connected to an exhaust pipe 94. The air outlet end of the exhaust pipe 94 extends to the outside of the mounting pipe 1. The heat exchange hole 82 has a serpentine structure, which can improve the heat exchange efficiency and the fullness of heat exchange.

[0021] An electromagnetic clutch 10 is fixed at the output end of the motor 73, and the end of the electromagnetic clutch 10 away from the motor 73 is connected to the reciprocating lead screw assembly 74 for transmission. The electromagnetic clutch 10 is electrically connected to the meter body 2. The electromagnetic clutch 10 includes components such as a moving plate, a stationary plate, and an electromagnetic assembly. When the electromagnetic assembly is working, the moving plate and the stationary plate are stably engaged to transmit power. When the electromagnetic assembly is de-energized, the moving plate and the stationary plate are separated from each other. At this time, the moving plate and the stationary plate rotate relative to each other without affecting each other.

[0022] An encoder 11 is fixed to the bottom of the mounting plate 72, and the rotating end of the encoder 11 is connected to the output end of the motor 73. The encoder 11 is used to monitor the number of rotations of the output end of the motor 73. The meter body 2 controls the output power of the motor 73 according to the electrical signals fed back by the two piezoelectric detection sensors 3. The meter body 2 controls the operation of the electromagnetic clutch 10 according to the electrical signals fed back by the encoder 11. The encoder 11 is based on the photoelectric principle. When the grating rotates with the output end of the motor 73, the light signal is projected to the photodiode through the grating. The photodiode converts the light signal into an electrical signal and feeds it back to the counting end. After the encoder 11 counts to the set value, the encoder 11 will feed back an electrical signal to the meter body 2. After receiving the electrical signal fed back by the encoder 11, the meter body 2 will start the impurity cleaning operation.

[0023] At least two limiting slide rods 12 are fixed inside the lower sealing cover 5, and both limiting slide rods 12 are slidably connected to the triangular prism 4. The limiting slide rods 12 can improve the stability of the movement of the triangular prism 4 and minimize the impact of the vortex generated by the movement of the triangular prism 4 on the medium.

[0024] The top of the limiting slide bar 12 is fixed with a tapered column 13, and the top of the tapered column 13 is fixed inside the sealing cover 5 on the same side. The top of the triangular column 4 is provided with a tapered snap-fit ​​groove that matches the tapered column 13. By using the tapered column 13 in conjunction with the tapered snap-fit ​​groove, the triangular column 4 can maintain sufficient stability when it normally withstands the impact of the medium.

[0025] The operating principle of this invention is explained as follows: The installation pipe 1 is installed on the medium conveying pipe (connected by components such as flanges and nuts), and the triangular prism 4 must be positioned upstream of the installation pipe 1 during installation. Then, the power supply end of the meter body 2 is connected to the external power supply line. When monitoring the medium flow rate, the medium enters the installation pipe 1 through the external pipeline and then flows through the triangular prism 4. Under the action of the flow-facing plane and the two inclined sides of the triangular prism 4, the medium forms a stable boundary layer separation, thereby generating regular alternating Karman vortices. The alternating shedding of the vortices will form a periodic alternating lift force on both sides of the ceramic-metal composite plate 81. This force acts on the detection end of the piezoelectric detection sensor 3 on both sides of the ceramic-metal composite plate 81. At this time, the piezoelectric detection sensor 3 will sense the periodic force and generate an electrical signal of the corresponding frequency, and transmit the vortex shedding frequency signal and intensity signal to the meter body 2. The meter body 2 will then perform calculations according to the preset instrument coefficient and frequency and flow rate correspondence to complete the measurement of the medium flow rate. During the monitoring of medium flow, the meter body 2 controls the motor 73 to work. The output of the motor 73 drives the fan impeller 91 to rotate. At this time, external air enters through the air inlet 92 and is discharged into the heat exchange hole 82 through the air supply pipe 93, and finally discharged through the exhaust pipe 94. When the external cold air passes through the heat exchange hole 82, it can absorb the heat of the ceramic metal composite plate 81. The ceramic metal composite plate 81 can absorb the heat of the two piezoelectric detection sensors 3, thereby reducing the impact of high temperature on the accuracy of the piezoelectric detection sensor 3 and helping to improve the detection accuracy of the piezoelectric detection sensor 3. Secondly, when the medium flows, impurities carried in the medium will impact the triangular prism 4. At this time, some impurities may adhere to the flow-facing surface of the triangular prism 4 under the action of the medium flow pressure. The piezoelectric sensor 3 will generate an electrical signal based on the vortex formed by the medium. When the medium flow rate is large, the frequency of the electrical signal generated based on the vortex is higher, and vice versa. When the frequency is higher, the output power of the motor 73 controlled by the meter body 2 is higher (the relationship between the output power of the motor 73 and the frequency of the vortex generated by the medium can be preset. For example, when the vortex frequency is in the range of A1-A2, the output power of the motor 73 is P1, and when the vortex frequency is in the range of A2-A3, the output power of the motor 73 is P2. The output power of the motor 73 cannot exceed the rated power). The encoder 11 can measure the number of rotations at the output end of the motor 73. After the number of rotations reaches the set value (this set value can be set according to the average amount of impurities carried in the medium), the encoder 11 will feed back an electrical signal to the meter body 2. At this time, the meter body 2 will activate the electromagnetic clutch. 10. The electromagnetic clutch 10 controls the motor 73 to operate at its highest power. When the electromagnetic clutch 10 is working, its moving plate engages with the stationary plate. At this time, the driving force at the output end of the motor 73 is transmitted to the reciprocating screw assembly 74 via the electromagnetic clutch 10. The reciprocating screw assembly 74 then drives the triangular column 4 to move downward (the reciprocating screw assembly 74 includes components such as a reciprocating screw, screw nut, and sealed bearing). At this time, impurities attached to the surface of the triangular column 4 are blocked by the rubber sleeve 6, thereby causing the impurities to peel off from the surface of the triangular column 4. Subsequently, the impurities continue to be removed under the action of the medium flow. As the flow continues to flow away, the triangular prism 4 moves upward and resets under the action of the reciprocating screw assembly 74. At this time, since the impurities on the surface of the triangular prism 4 have been scraped off, it is possible to avoid impurities from lingering on the surface of the triangular prism 4, thereby affecting the normal generation of vortices in the medium. This can help improve the monitoring accuracy of the piezoelectric detection sensor 3 for the medium vortex. After the triangular prism 4 moves upward and resets, the meter body 2 controls the electromagnetic clutch 10 to de-energize and controls the encoder 11 to return to zero and start counting again, until the encoder 11 feeds back an electrical signal to the meter body 2 again.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-interference vortex flow meter, comprising an installation pipe (1), a meter body (2), two piezoelectric sensors (3), and a triangular prism (4), wherein the triangular prism (4) is disposed inside the feed end of the installation pipe (1), and the two piezoelectric sensors (3) are disposed downstream of the triangular prism (4), and the meter body (2) is detachably connected to the installation pipe (1), characterized in that, Also includes: Two sealing covers (5) are fixedly inserted into the upper and lower pipe walls of the installation pipe (1) respectively, and the two sealing covers (5) are coaxial with the triangular prism (4). The two sealing covers (5) are fixed with rubber sleeves (6) at opposite ends inside, and the triangular prism (4) is slidably connected to the inner wall of the rubber sleeve (6). The drive unit (7) is installed on the top of the upper sealing cover (5), and the drive unit (7) drives the triangular column (4) to move coaxially along the sealing cover (5); A heat-conducting installation mechanism (8) is set inside the installation pipe (1), and both piezoelectric detection sensors (3) are connected to the meter body (2) through the heat-conducting installation mechanism (8).

2. The anti-interference vortex flowmeter according to claim 1, characterized in that, The drive unit (7) includes a mounting sleeve (71) fixed on the top of the upper sealing cover (5). A mounting plate (72) is detachably mounted on the top of the mounting sleeve (71). A motor (73) is fixed on the top of the mounting plate (72), and the output end of the motor (73) is rotatably connected to the mounting plate (72). A reciprocating screw assembly (74) is installed inside both sealing covers (5). The triangular column (4) moves coaxially inside the sealing cover (5) through the reciprocating screw assembly (74). The output end of the motor (73) is connected to the reciprocating screw assembly (74) for transmission. The motor (73) is electrically connected to the meter body (2).

3. The anti-interference vortex flowmeter according to claim 2, characterized in that, The heat-conducting installation mechanism (8) includes a ceramic-metal composite plate (81) fixed to the mounting end of the meter body (2). The ceramic-metal composite plate (81) has mounting grooves on its two opposite side walls, and a piezoelectric detection sensor (3) is fixed inside the corresponding mounting groove. The ceramic-metal composite plate (81) has heat exchange holes (82) inside, and an air guide assembly (9) connected to the heat exchange holes (82) is installed on the inner side of the mounting sleeve (71).

4. The anti-interference vortex flow meter according to claim 3, characterized in that, The air guide assembly (9) includes a fan impeller (91) fixedly sleeved on the output end of the motor (73). The side wall of the mounting sleeve (71) is provided with several air inlet holes (92) on one side of the air intake end of the fan impeller (91). An air supply pipe (93) is fixedly inserted into the side wall of the mounting sleeve (71) on one side of the air exhaust end of the fan impeller (91). The air supply pipe (93) is connected to the interior of the heat exchange hole (82). The air outlet end of the heat exchange hole (82) is fixedly connected to an exhaust pipe (94). The air outlet end of the exhaust pipe (94) extends to the outside of the mounting pipe (1).

5. The anti-interference vortex flowmeter according to claim 2, characterized in that, The output end of the motor (73) is fixed with an electromagnetic clutch (10), and the end of the electromagnetic clutch (10) away from the motor (73) is connected to the reciprocating screw assembly (74) for transmission. The electromagnetic clutch (10) is electrically connected to the meter body (2).

6. The anti-interference vortex flowmeter according to claim 5, characterized in that, An encoder (11) is fixed to the bottom of the mounting plate (72), and the rotating end of the encoder (11) is connected to the output end of the motor (73) for transmission. The encoder (11) is used to monitor the number of rotations of the output end of the motor (73). The meter body (2) controls the output power of the motor (73) according to the electrical signals fed back by the two piezoelectric detection sensors (3). The meter body (2) controls the operation of the electromagnetic clutch (10) according to the electrical signals fed back by the encoder (11).

7. The anti-interference vortex flowmeter according to claim 1, characterized in that, At least two limiting slide rods (12) are fixed inside the sealing cover (5) located on the lower side, and both limiting slide rods (12) are slidably connected to the triangular prism (4).

8. The anti-interference vortex flowmeter according to claim 7, characterized in that, The top of the limiting slide bar (12) is fixed with a tapered column (13), and the top of the tapered column (13) is fixed inside the sealing cover (5) on the same side. The top of the triangular column (4) is provided with a tapered snap-fit ​​groove that matches the tapered column (13).

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