Precession flow meter

Abstract

The invention belongs to the technical field of intelligent sensors, and particularly relates to a precession flow meter which comprises a base, a flow meter body and a PLC are arranged above the base, the two ends of the flow meter body are connected with a first pipe and a second pipe respectively, the first pipe and the second pipe are each provided with an on-off valve, and the precession flow meter further comprises two clamping and fixing assemblies. The clamping and fixing assembly is fixed to the base and arranged on the outer side of the flow meter body and provides clamping and fixing force for the flow meter body. The precession flowmeter can be cleaned on line without disassembly and assembly, measurement errors caused by disassembly and assembly secondary damage and inner wall scaling are avoided, meanwhile, self-adaptive adjustment of clamping force along with flux is achieved, high-speed vibration is prevented, signal interference intensification caused by too high rigidity is avoided, the installation stability and the measurement precision are improved, and the measurement precision is improved. Flux can be automatically metered, online cleaning is triggered at a threshold value, cleaning is conducted in time, and impurity blockage is prevented from affecting measurement accuracy.

Description

Technical Field

[0001] This invention belongs to the field of intelligent sensor technology, and in particular relates to a vortex flow meter. Background Technology

[0002] The vortex flow meter is a widely used velocity-type flow meter that can be used for flow measurement and control of most gases, liquids and steam. It has no moving mechanical parts and no easily damaged parts such as impellers / bearings. It has the advantages of wear resistance, impurity resistance, long-term stability and minimal maintenance, and is widely used in the field of industrial flow detection.

[0003] Currently, traditional vortex flowmeters and their associated installation and maintenance technologies still have many shortcomings: Firstly, it lacks an online cleaning function that does not require disassembly. When scale builds up on the inner wall of the flow meter, the instrument needs to be disassembled for cleaning. The disassembly process can easily cause secondary damage to the instrument. Furthermore, scale buildup on the inner wall will change the cross-sectional area of ​​the flow channel and the fluid resistance, leading to unstable vortex generation and distorted precession frequency, which directly causes errors in the flow reading. At the same time, the cleaning work relies on manual periodic operation and cannot be started in time according to the actual flow rate. Impurities are easy to accumulate and block the flow channel, further affecting the accuracy of the measurement. Secondly, the flow meter's clamping mechanism mostly uses a static fixing method, and the clamping force cannot be adaptively adjusted according to the incoming flow rate. When the fluid is introduced at high speed and the flow rate increases, the flow meter body is prone to secondary vibration due to insufficient clamping force. On the other hand, if the static clamping force is too large, it will lead to excessive structural rigidity and the vibration energy cannot be dissipated, which will aggravate the signal interference of the sensor inside the flow meter. This not only reduces the installation stability of the flow meter, but also makes it difficult to guarantee the measurement accuracy under different flow conditions. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a swivel flow meter, including a base, a flow meter body and a PLC controller are provided on the top of the base, and pipe one and pipe two are respectively connected to the two ends of the flow meter body. On-off valves are installed on pipe one and pipe two. It also includes two sets of clamping and fixing components, which are fixed on the base and arranged on the outside of the flow meter body to provide clamping and fixing force for the flow meter body. A controllable cleaning inlet assembly is fixedly connected to the lower side of the first pipe for introducing cleaning agent into the flow meter body; The lower side of the second pipe is fixedly connected to a discharge component, which is used to guide and discharge the cleaning agent introduced into the flow meter body, and cooperate with the controllable cleaning inlet component to flush and clean the flow meter body. The base is also fixedly equipped with a flow synchronization feedback component. The flow synchronization feedback component adjusts its feedback signal synchronously and in real time based on the signal fed back by the flow meter body, which is used to synchronously control the clamping force of the clamping and fixing component. The flow synchronization feedback component is equipped with a cleaning action triggering warning component, which is used to control the automatic start of the controllable cleaning inlet component.

[0006] In the aforementioned swivel flowmeter, the clamping and fixing assembly includes a support column fixed to the upper end of the base. A fixing ring is fixedly connected to the upper end of the support column. The fixing ring is sleeved on the outside of the flowmeter body. Multiple push rods are evenly inserted and movably fitted on the surface of the fixing ring. One end of the multiple push rods on the same side is fixedly connected to the same arc-shaped extrusion plate that is extruded outside the flowmeter body. The end of the multiple push rods on the same side away from the arc-shaped extrusion plate is fixedly connected to the same force plate. A thrust permanent magnet plate is fixedly installed on the side of the force plate away from the push rods. Multiple insulating covers are fixedly installed on the outer surface of the fixing ring and sleeved on the force plate. A thrust electromagnetic plate is fixedly installed on the inner wall of the insulating cover and arranged opposite to the thrust permanent magnet plate.

[0007] In the aforementioned swirling flowmeter, the controllable cleaning inlet assembly includes an inlet pipe fixedly connected to the lower side of the main pipe, a return pipe fixedly connected to the wall of the inlet pipe, a flap valve one connected to the inlet pipe, a flap valve two installed on the return pipe, a support plate fixedly connected to the lower side of the main pipe, a drive shaft rotatably connected to the side wall of the support plate, a servo motor for driving the drive shaft to rotate fixedly installed on the support plate, the end of the drive shaft away from the servo motor fixedly connected to the input end of the flap valve one, and the drive shaft and the input end of the flap valve two are connected by a bevel gear assembly.

[0008] In the aforementioned swirling flow meter, the discharge assembly includes a discharge pipe fixedly connected to the lower side of the second pipe, an on / off valve is installed on the discharge pipe, and a discharge water tank located directly below the discharge pipe is fixedly installed at the upper end of the base.

[0009] In the aforementioned swirling flowmeter, the flow synchronization feedback assembly includes a feedback housing fixed on a base. An electric push rod is fixedly inserted on one side of the feedback housing. A moving plate is fixedly connected to the movable end of the electric push rod located inside the feedback housing. A resistance strip is fixedly installed on the top of the inner wall of the feedback housing. A conductive block that contacts the resistance strip is fixedly connected to the upper end of the moving plate. A laser rangefinder, which is positioned opposite the moving plate, is fixedly inserted on the other side of the feedback housing. The conductive block and the resistance strip are connected in series in the power supply circuit of the thrust electromagnetic plate.

[0010] In the aforementioned swirling flowmeter, the cleaning action triggering alarm component includes a trigger housing fixed to the upper end of the feedback housing. A rotating screw is rotatably connected to the inner wall of the trigger housing. A reduction motor for driving the rotating screw to rotate is fixedly installed on the outer wall of the trigger housing. A trigger plate is threaded onto the rod wall of the rotating screw. A trigger switch opposite to the trigger plate is fixedly installed on the rear side of the inner wall of the trigger housing.

[0011] In the aforementioned swirling flowmeter, a limiting slider is fixedly connected to the upper end of the trigger plate, and a limiting groove is provided on the inner wall of the trigger housing to match and slide with the limiting slider.

[0012] In the aforementioned swirling flowmeter, an alarm is also fixed to the upper end of the trigger housing. The alarm is activated when the trigger plate moves and presses against the trigger switch.

[0013] Compared with existing technologies, the advantages of this invention are as follows: 1. By setting up the flow meter body, pipe one, pipe two, controllable cleaning inlet component, and discharge component, online cleaning of the vortex flow meter can be achieved without disassembling the vortex flow meter, effectively avoiding secondary damage caused during disassembly and assembly. It also avoids the problem that scale buildup on the inner wall of the vortex flow meter will change the cross-sectional area of ​​the flow channel and the fluid resistance, leading to unstable vortex generation, distorted precession frequency, and directly causing errors in the flow reading.

[0014] 2. Through the clamping and fixing components and the flow synchronization feedback components, the squeezing and clamping force of the swivel flowmeter can be adaptively adjusted according to the flow rate. The higher the flow rate, the greater the clamping force. This can effectively prevent secondary vibration of the flowmeter body caused by insufficient clamping force when the fluid is introduced at high speed. It can also avoid excessive clamping force leading to excessive structural rigidity and failure to dissipate vibration energy, which would aggravate sensor signal interference. This significantly improves the installation stability and measurement accuracy of the flowmeter body and ensures stable operation under different flow conditions.

[0015] 3. Through the set flow synchronization feedback component, cleaning action triggering alarm component, and alarm device, the flow rate through the vortex flow meter can be automatically calculated, and the online cleaning of the vortex flow meter can be automatically started when the flow rate reaches the threshold, making the cleaning of the vortex flow meter more timely and avoiding the problem of impurities contaminating and clogging the vortex flow meter and affecting the measurement accuracy. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the clamping and fixing component of the present invention; Figure 3 This is a three-dimensional structural schematic diagram of the controllable cleaning inlet component of the present invention; Figure 4 This is a three-dimensional structural diagram of the installation of the flow synchronization feedback component and the cleaning action triggering warning component of the present invention; Figure 5 This is a front cross-sectional view of the flow synchronization feedback component of the present invention; Figure 6 This is a front cross-sectional view of the cleaning action triggering warning component of the present invention.

[0017] In the diagram: 1. Base; 2. Flow meter body; 3. Pipe 1; 4. Pipe 2; 5. On / off valve; 6. Clamping and fixing assembly; 61. Support column; 62. Fixing ring; 63. Push rod; 64. Arc-shaped extrusion plate; 65. Force plate; 66. Thrust permanent magnet plate; 67. Insulating cover; 68. Thrust electromagnetic plate; 7. Controllable cleaning inlet assembly; 71. Inlet pipe; 72. Return pipe; 73. Flip valve 1; 74. Flip valve 2; 75. Support plate; 76. Drive shaft; 77. Servo motor; 78. Bevel gear assembly; 8. Discharge assembly; 81. Discharge pipe; 82. On / off valve; 83. Discharge tank; 9. Flow synchronization feedback assembly; 91. Feedback shell; 92. Electric push rod; 93. Moving plate; 94. Resistance strip; 95. Conductive block; 96. Laser rangefinder; 10. Cleaning action trigger warning assembly; 101. Trigger shell; 102. Rotating screw; 103. Gear motor; 104. Trigger plate; 105. Trigger switch; 106. Alarm device. 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 1-6 As shown, the rotary flow meter includes a base 1, a flow meter body 2 and a PLC controller are provided on the top of the base 1, and pipe 3 and pipe 4 are respectively connected to the two ends of the flow meter body 2. On-off valves 5 are installed on pipe 3 and pipe 4. It also includes two sets of clamping and fixing components 6. The clamping and fixing components 6 are fixed on the base 1 and are located on the outside of the flow meter body 2 to provide clamping and fixing force for the flow meter body 2. The clamping and fixing assembly 6 includes a support column 61 fixed to the upper end of the base 1. A fixing ring 62 is fixedly connected to the upper end of the support column 61. The fixing ring 62 is sleeved on the outside of the flow meter body 2. Multiple push rods 63 are evenly inserted into the surface of the fixing ring 62. One end of the multiple push rods 63 on the same side is fixedly connected to the same arc-shaped extrusion plate 64 that is extruded on the outside of the flow meter body 2. The end of the multiple push rods 63 on the same side away from the arc-shaped extrusion plate 64 is fixedly connected to the same force plate 65. A thrust permanent magnet plate 66 is fixedly installed on the side of the force plate 65 away from the push rods 63. Multiple insulating covers 67 are fixedly installed on the outer surface of the fixing ring 62 and sleeved on the outside of the force plate 65. A thrust electromagnetic plate 68 is fixedly installed on the inner wall of the insulating cover 67 and is arranged opposite to the thrust permanent magnet plate 66.

[0020] A controllable cleaning inlet assembly 7 is fixedly connected to the lower side of pipe 3, which is used to introduce cleaning agent into the flow meter body 2; The controllable cleaning inlet assembly 7 includes an inlet pipe 71 fixedly connected to the lower side of pipe 3. A return pipe 72 is fixedly connected to the wall of the inlet pipe 71. A flap valve 73 is connected to the inlet pipe 71. A flap valve 74 is installed on the return pipe 72. A support plate 75 is fixedly connected to the lower side of pipe 3. A drive shaft 76 is rotatably connected to the side wall of the support plate 75. A servo motor 77 for driving the drive shaft 76 to rotate is fixedly installed on the support plate 75. The end of the drive shaft 76 away from the servo motor 77 is fixedly connected to the input end of the flap valve 73. The drive shaft 76 and the input end of the flap valve 74 are connected by a bevel gear assembly 78.

[0021] The lower side of the second pipe 4 is fixedly connected to the discharge component 8, which is used to guide and discharge the cleaning agent introduced into the flow meter body 2, and cooperate with the controllable cleaning inlet component 7 to flush and clean the flow meter body 2. The discharge assembly 8 includes a discharge pipe 81 fixedly connected to the lower side of the second pipe 4, an on / off valve 82 installed on the discharge pipe 81, and a discharge water tank 83 located directly below the discharge pipe 81 fixedly installed at the upper end of the base 1.

[0022] A flow synchronization feedback component 9 is also fixedly installed on the base 1. The flow synchronization feedback component 9 adjusts its feedback signal synchronously and in real time based on the signal fed back by the flow meter body 2, which is used to synchronously control the clamping force of the clamping and fixing component 6. The flow synchronization feedback component 9 includes a feedback shell 91 fixed on the base 1. An electric push rod 92 is fixedly inserted on one side of the feedback shell 91. A moving plate 93 is fixedly connected to the moving end of the electric push rod 92 inside the feedback shell 91. A resistor strip 94 is fixedly installed on the top of the inner wall of the feedback shell 91. A conductive block 95 that contacts the resistor strip 94 is fixedly connected to the upper end of the moving plate 93. A laser rangefinder 96 that is opposite to the moving plate 93 is fixedly inserted on the other side of the feedback shell 91. The conductive block 95 and the resistor strip 94 are connected in series in the power supply circuit of the thrust electromagnetic plate 68.

[0023] A cleaning action triggering alarm component 10 is fixed on the flow synchronization feedback component 9. The cleaning action triggering alarm component 10 is used to control the automatic start of the controllable cleaning inlet component 7. The cleaning action triggering alarm assembly 10 includes a trigger housing 101 fixed to the upper end of the feedback housing 91. A rotating screw 102 is rotatably connected to the inner wall of the trigger housing 101. A reduction motor 103 for driving the rotating screw 102 to rotate is fixedly installed on the outer wall of the trigger housing 101. A trigger plate 104 is threadedly sleeved on the rod wall of the rotating screw 102. A trigger switch 105 is fixedly installed on the rear side of the inner wall of the trigger housing 101, which is opposite to the trigger plate 104. A limit slider is fixedly connected to the upper end of the trigger plate 104. A limit groove matching the limit slider is opened on the inner wall of the trigger housing 101. An alarm 106 is also fixed to the upper end of the trigger housing 101. The alarm 106 is activated when the trigger plate 104 moves and presses against the trigger switch 105.

[0024] The operating principle of the present invention is described as follows: Pipe 3 and pipe 4 are respectively sealed to the flow meter body 2 through flanges. Pipe 3 is fixed at the inlet of the flow meter body 2, and pipe 4 is fixed at the outlet of the flow meter body 2. The flow rate of the incoming fluid is monitored in real time through the flow meter body 2. The clamping and fixing assembly 6 is installed outside the flow meter body 2. The PLC controller controls the power supply equipment to supply power to the thrust electromagnetic plate 68. When the thrust electromagnetic plate 68 is energized, it generates the same polarity as the thrust permanent magnet plate 66, thereby applying a magnetic thrust to the force plate 65. This causes the force plate 65 to push the extrusion rod 63 and the arc-shaped extrusion plate 64 toward the flow meter body 2, so that the arc-shaped extrusion plate 64 is stably extruded and fixed on the outside of the flow meter body 2. This makes the installation of the flow meter body 2 more stable and avoids the problem of vibration during the process of fluid entering the flow meter body 2, which would affect the measurement accuracy. The PLC controller automatically adjusts the set threshold of the laser rangefinder 96 within the flow synchronization feedback component 9 based on the real-time flow signal fed back from the flow meter body 2. The higher the flow rate, the lower the set threshold of the laser rangefinder 96. This means the PLC controller controls the electric push rod 92 to push the moving plate 93 a greater distance, bringing the distance between the moving plate 93 and the laser rangefinder 96 to the set threshold. This, in turn, causes the conductive block 95 to slide a greater distance on the resistor strip 94, reducing the resistance value of the resistor strip 94. Furthermore, the conductive block 95 and the resistor strip 94 are connected in series in the power supply circuit of the thrust electromagnetic plate 68, which in turn affects the power supply to the thrust electromagnetic plate 68. The increased current enhances the magnetic thrust on the arc-shaped extrusion plate 64, ensuring that the flow meter body 2 maintains a stable installation state even at high flow rates. This not only guarantees the sealing of the flow meter body 2 with pipe 1 3 and pipe 2 4, but also prevents the vibration generated by the flow meter body 2 from affecting the stability of its monitoring sensor. It effectively prevents secondary vibration of the flow meter body 2 caused by insufficient clamping force when fluid flows in at high speed, and also avoids excessive clamping force leading to excessive structural rigidity and failure to dissipate vibration energy, which would exacerbate sensor signal interference. This significantly improves the installation stability and measurement accuracy of the flow meter body 2, ensuring stable operation under different flow conditions. When fluid is introduced into the flowmeter body 2 for operation, the PLC controller synchronously controls the cleaning action trigger warning component 10 to operate. The geared motor 103 drives the rotating screw 102 to rotate. Through the threaded connection between the rotating screw 102 and the trigger plate 104, the trigger plate 104 moves towards the trigger switch 105 inside the trigger housing 101. The conductive block 95 and the resistor strip 94 are also connected in series in the power supply circuit of the geared motor 103. When the flow rate of the fluid introduced into the flowmeter body 2 is large, the driving speed of the geared motor 103 is faster, which in turn makes the moving speed of the trigger plate 104 faster. The trigger plate 104 will press on the trigger switch 105 in a shorter time. After the flowmeter body 2 has been working for a period of time and the trigger plate 104 presses on the trigger switch 105, the online cleaning operation of the flowmeter body 2 is started, and the controllable cleaning inlet component 7 and the discharge component 8 are put into operation. The PLC controller first slowly closes the on / off valves 5 on pipes 3 and 4, and gradually opens the valve 82 on the discharge pipe 81 to ensure a smooth switch of the main process flow to the bypass without sudden changes in pressure or flow. This drains the residual medium from the flowmeter body 2. After complete drainage, the valve 82 is closed, and cleaning agent is introduced through the inlet pipe 71. At this time, the PLC controller controls the servo motor 77 to drive the transmission shaft 76 to rotate the flap valve 73. Simultaneously, the transmission shaft 76 drives the flap valve 74 through the bevel gear assembly 78, opening flap valve 73 completely and then closing flap valve 74 completely. Cleaning agent is injected into the flowmeter body 2 until it is completely filled. The body is then allowed to soak statically for 30 minutes to soften the sticky deposits. After soaking, the valve 82 on the discharge pipe 81 is opened to discharge the wastewater into the discharge tank 83. At this time, flap valve 73 remains fully open, allowing the cleaning agent to flush the flow meter body 2 at a high flow rate, quickly expelling the dirt inside the flow meter body 2. After flushing for 5 minutes, the PLC controller controls the servo motor 77 to operate, which in turn drives flap valve 73 and flap valve 74 to operate, keeping both flap valve 73 and flap valve 74 in a half-open state. This reduces the flushing flow rate of the cleaning agent entering the flow meter body 2, causing the liquid to form turbulence and flushing the dead zones of the vortex generator and sensor inside the flow meter body 2 (the vortex generator and sensor are conventional structural components inside the flow meter, which will not be elaborated on here). After maintaining this for 10 minutes, the PLC controller controls the servo motor 77 to operate in both directions, thereby continuously changing the opening state of flap valve 73, forming a pulse flushing liquid flow that enhances the flushing force on stubborn dirt. The cleaning work is completed after 5 minutes.

[0025] 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. A vortex flow meter, comprising a base (1), a flow meter body (2) and a PLC controller being provided above the base (1), wherein pipe one (3) and pipe two (4) are respectively connected to both ends of the flow meter body (2), and on / off valves (5) are installed on both pipe one (3) and pipe two (4), characterized in that, It also includes two sets of clamping and fixing components (6), which are fixed on the base (1) and located on the outside of the flow meter body (2) to provide clamping and fixing force to the flow meter body (2); The lower side of the tube (3) is fixedly connected to a controllable cleaning inlet assembly (7) for introducing cleaning agent into the flow meter body (2); The lower side of the second pipe (4) is fixedly connected to a discharge component (8), which is used to guide and discharge the cleaning agent introduced into the flow meter body (2), and cooperate with the controllable cleaning inlet component (7) to flush and clean the flow meter body (2); The base (1) is also fixedly installed with a flow synchronization feedback component (9). The flow synchronization feedback component (9) adjusts its feedback signal synchronously and in real time based on the signal fed back by the flow meter body (2) to synchronously control the clamping force of the clamping and fixing component (6). A cleaning action trigger warning component (10) is fixed on the flow synchronization feedback component (9). The cleaning action trigger warning component (10) is used to control the self-starting of the controllable cleaning inlet component (7).

2. The vortex flowmeter according to claim 1, characterized in that, The clamping and fixing assembly (6) includes a support column (61) fixed to the upper end of the base (1). A fixing ring (62) is fixedly connected to the upper end of the support column (61). The fixing ring (62) is sleeved on the outside of the flow meter body (2). Multiple extrusion rods (63) are evenly inserted into the surface of the fixing ring (62). One end of the multiple extrusion rods (63) on the same side is fixedly connected to the same arc-shaped extrusion plate (64) that is extruded on the outside of the flow meter body (2). The ends of the multiple push rods (63) away from the arc-shaped extrusion plate (64) are fixedly connected to the same force plate (65). A thrust permanent magnet plate (66) is fixedly installed on the side of the force plate (65) away from the push rods (63). Multiple insulating covers (67) sleeved on the outer surface of the fixing ring (62) are fixedly installed. A thrust electromagnetic plate (68) is fixedly installed on the inner wall of the insulating cover (67) opposite to the thrust permanent magnet plate (66).

3. The vortex flowmeter according to claim 1, characterized in that, The controllable cleaning inlet assembly (7) includes an inlet pipe (71) fixedly connected to the lower side of pipe one (3), a return pipe (72) fixedly connected to the wall of the inlet pipe (71), a flap valve one (73) connected to the inlet pipe (71), a flap valve two (74) installed on the return pipe (72), a support plate (75) fixedly connected to the lower side of pipe one (3), a drive shaft (76) rotatably connected to the side wall of the support plate (75), a servo motor (77) for driving the drive shaft (76) to rotate fixedly installed on the support plate (75), a drive shaft (76) fixedly connected to the side wall of the support plate (75), a servo motor (77) for driving the drive shaft (76) to rotate, a drive shaft (76) with one end away from the servo motor (77) fixedly connected to the input end of flap valve one (73), and the drive shaft (76) and the input end of flap valve two (74) are connected by a bevel gear assembly (78).

4. The vortex flowmeter according to claim 1, characterized in that, The discharge assembly (8) includes a discharge pipe (81) fixedly connected to the lower side of the second pipe (4), an on / off valve (82) is installed on the discharge pipe (81), and a discharge water tank (83) located directly below the discharge pipe (81) is fixedly installed at the upper end of the base (1).

5. The vortex flowmeter according to claim 2, characterized in that, The flow synchronization feedback component (9) includes a feedback shell (91) fixed on a base (1). An electric push rod (92) is fixedly inserted on one side of the feedback shell (91). A moving plate (93) is fixedly connected to the moving end of the electric push rod (92) inside the feedback shell (91). A resistor strip (94) is fixedly installed on the top of the inner wall of the feedback shell (91). A conductive block (95) in contact with the resistor strip (94) is fixedly connected to the upper end of the moving plate (93). A laser rangefinder (96) is fixedly inserted on the other side of the feedback shell (91) and is arranged opposite to the moving plate (93). The conductive block (95) and the resistor strip (94) are connected in series in the power supply circuit of the thrust electromagnetic plate (68).

6. The vortex flowmeter according to claim 5, characterized in that, The cleaning action trigger warning assembly (10) includes a trigger housing (101) fixed on the upper end of the feedback housing (91). A rotating screw (102) is rotatably connected to the inner wall of the trigger housing (101). A geared motor (103) for driving the rotating screw (102) to rotate is fixedly installed on the outer wall of the trigger housing (101). A trigger plate (104) is threaded onto the rod wall of the rotating screw (102). A trigger switch (105) is fixedly installed on the rear side of the inner wall of the trigger housing (101) opposite to the trigger plate (104).

7. The vortex flowmeter according to claim 6, characterized in that, The upper end of the trigger plate (104) is fixedly connected to a limiting slider, and the inner wall of the trigger shell (101) is provided with a limiting groove that matches and slides with the limiting slider.

8. The vortex flowmeter according to claim 6, characterized in that, An alarm (106) is also fixed to the upper end of the trigger housing (101). The alarm (106) is activated after the trigger plate (104) moves and presses on the trigger switch (105).

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