A reverse flow-proof turbine flowmeter

Abstract

The application discloses an anti-backflow turbine flowmeter, and belongs to the turbine flowmeter field.The anti-backflow turbine flowmeter comprises a turbine flowmeter main body and a flow sensor fixedly installed on the turbine flowmeter main body, and the turbine flowmeter main body is provided with an anti-backflow mechanism at an outlet end.The anti-backflow mechanism comprises a valve body fixedly connected to the outlet end of the turbine flowmeter main body, a valve cover fixedly installed at the top end of the valve body, an O-shaped ball valve rotatably installed in the valve body, and two sealing rings fixedly installed in the valve body and corresponding to the positions at the two ends of the O-shaped ball valve.The anti-backflow turbine flowmeter can quickly close the O-shaped ball valve when backflow occurs, so that the backflow of fluid is prevented, the pulse signal interference caused by the reverse rotation of turbine blades due to the backflow is avoided, the display instrument can accurately display flow data, and the cumulative flow error is prevented.

Description

Technical Field

[0001] This application relates to the field of turbine flow meter technology, specifically a backflow prevention turbine flow meter. Background Technology

[0002] A turbine flow meter is a velocity-type flow meter that measures flow based on the principle of turbine rotation. It indirectly calculates the volumetric flow rate or mass flow rate of the fluid by detecting the rotational speed of the turbine that drives the fluid to rotate.

[0003] Turbine flow meters may experience backflow under conditions such as pipeline system design flaws, valve misoperation or malfunction, improper control of multi-pump parallel systems, absence or failure of check valves, fluid pressure fluctuations, or reverse flow conditions. Backflow causes the turbine blades to rotate in the opposite direction, generating a pulse signal opposite to the forward flow, resulting in negative values ​​or incorrect cumulative flow readings on the display instrument. Prolonged backflow can also accelerate turbine bearing wear and even damage the magneto-electric converter, affecting measurement accuracy and equipment lifespan.

[0004] Therefore, this application provides a backflow prevention turbine flow meter to solve the above problems. Utility Model Content

[0005] This application provides a backflow prevention turbine flow meter, which aims to solve the existing problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a backflow prevention turbine flow meter, comprising a turbine flow meter body and a flow sensor fixedly installed on the turbine flow meter body. The turbine flow meter body has an backflow prevention mechanism at its outlet end. The backflow prevention mechanism includes a valve body fixedly connected to the outlet end of the turbine flow meter body, a valve cover fixedly installed on the top of the valve body, an O-type ball valve rotatably installed in the valve body, two sealing rings fixedly installed in the valve body at positions corresponding to both ends of the O-type ball valve, and a valve stem fixedly connected to the top of the O-type ball valve and rotatably connected to the valve cover through a sealing bushing. The valve cover is provided with a drive assembly connected to the valve stem for driving the O-type ball valve to rotate to adjust the valve opening and closing. Both the flow sensor and the drive assembly are connected to an external control system. In this way, by setting up an anti-backflow mechanism, the O-type ball valve can be quickly closed when backflow occurs, preventing fluid backflow and avoiding interference from pulse signals caused by the reverse rotation of turbine blades due to backflow. This allows the display instrument to accurately display flow data, prevents errors in cumulative flow, and can directly lock the O-type ball valve when the pipeline control valve is closed, thus directly preventing backflow.

[0007] Preferably, the drive assembly includes a drive housing fixedly mounted on the valve cover, a worm gear rotatably mounted inside the drive housing, a worm rotatably connected inside the drive housing and meshing with the side of the worm gear, and a motor fixedly mounted on the side of the drive housing with its output shaft connected to the worm. The bottom end of the worm gear has a pin that passes through the bottom of the drive housing and is connected to the valve stem. The input end of the motor is connected to an external control system.

[0008] Preferably, a sealing gasket is provided between the valve body and the valve cover.

[0009] Preferably, the valve body has a plurality of first bolts arranged in a circular array along the edge of the top opening, and the valve cover has mounting holes corresponding to the first bolts. Each of the first bolts is screwed with a first lock nut for locking the valve cover.

[0010] Preferably, each of the four corners of the drive box has a lug, and a second bolt is fixedly connected to the valve cover at the position corresponding to the lug. A second lock nut for locking the lug is screwed onto each of the second bolts.

[0011] Preferably, a cover is fixedly installed on the top of the drive box by screws.

[0012] This anti-backflow turbine flow meter, by setting an anti-backflow mechanism, can quickly close the O-type ball valve when backflow occurs, preventing fluid backflow and avoiding pulse signal interference caused by the reverse rotation of turbine blades due to backflow. This allows the display instrument to accurately display flow data, prevents cumulative flow errors, and can also directly lock the O-type ball valve when the pipeline control valve is closed, directly preventing backflow.

[0013] Due to the valve characteristics of the anti-backflow turbine flow meter, it can also be used directly as a backup valve, improving the overall safety of the pipeline. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a backflow prevention turbine flow meter. Figure 2 This is a schematic diagram of the internal structure of a backflow prevention turbine flow meter; Figure 3 This is a schematic diagram of the exploded structure of a backflow prevention turbine flow meter.

[0015] In the picture: 1. Turbine flow meter body; 2. Anti-backflow mechanism; 21. Valve body; 211. First bolt; 212. First lock nut; 22. Valve cover; 221. Mounting hole; 222. Second bolt; 223. Second lock nut; 23. O-type ball valve; 231. Valve stem; 24. Sealing ring; 25. Sealing gasket; 3. Flow sensor; 4. Drive assembly; 41. Drive box; 411. Box cover; 412. Ear piece; 42. Worm gear; 421. Pin; 43. Worm; 44. Motor. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] This embodiment provides a backflow prevention turbine flow meter, such as Figures 1-3 As shown, the anti-backflow turbine flow meter includes a turbine flow meter body 1 and a flow sensor 3 fixedly installed on the turbine flow meter body 1. The outlet end of the turbine flow meter body 1 has an anti-backflow mechanism 2. The anti-backflow mechanism 2 includes a valve body 21 fixedly connected to the outlet end of the turbine flow meter body 1, a valve cover 22 fixedly installed on the top of the valve body 21, an O-type ball valve 23 rotatably installed in the valve body 21, two sealing rings 24 fixedly installed in the valve body 21 at the positions corresponding to both ends of the O-type ball valve 23, and a valve stem 231 fixedly connected to the top of the O-type ball valve 23 and rotatably connected to the valve cover 22 through a sealing bushing. The valve cover 22 is provided with a drive assembly 4 connected to the valve stem 231 for driving the O-type ball valve 23 to rotate to adjust the opening and closing of the valve. Both the flow sensor 3 and the drive assembly 4 are connected to an external control system.

[0018] During use, the flow sensor 3 monitors the fluid flow inside the turbine flow meter body 1 in real time. Under normal circumstances, the fluid flows in from the inlet end of the turbine flow meter body 1, driving the turbine to rotate. The flow sensor 3 converts the detected turbine speed signal into an electrical signal and transmits it to the external control system. When backflow occurs, the external control system sends a command to the drive assembly 4 based on the abnormal signal fed back by the flow sensor 3. After receiving the command, the drive assembly 4 drives the valve stem 231 to rotate. The valve stem 231 drives the O-type ball valve 23 to rotate, so that the O-type ball valve 23 is in the closed state, preventing fluid backflow. The two sealing rings 24 are located at both ends of the O-type ball valve 23, respectively, and play a sealing role to prevent fluid from leaking from the gap between the O-type ball valve 23 and the valve body 21.

[0019] Specifically, the drive assembly 4 includes a drive housing 41 fixedly mounted on the valve cover 22, a worm gear 42 rotatably mounted inside the drive housing 41, a worm 43 rotatably connected inside the drive housing 41 and meshing with the side of the worm gear 42, and a motor 44 fixedly mounted on the side of the drive housing 41 with its output shaft connected to the worm 43. The worm gear 42 has a pin 421 at its bottom end that passes through the bottom of the drive housing 41 and is connected to the valve stem 231. The input end of the motor 44 is connected to an external control system. When the external control system detects a reverse flow signal, it sends a command to the motor 44, which starts, and its output shaft drives the worm 43 to rotate. The worm 43 meshes with the worm gear 42 on the side. The rotation of the worm 43 will drive the worm gear 42 to rotate inside the drive box 41. The pin 421 at the bottom of the worm gear 42 passes through the bottom of the drive box 41 and is connected to the valve stem 231. Therefore, the rotation of the worm gear 42 will drive the valve stem 231 to rotate through the pin 421, thereby causing the O-type ball valve 23 to rotate and realize the opening and closing operation of the valve. The worm gear drive can achieve a large transmission ratio in a small space, making the overall structure of the drive assembly 4 compact and space-saving. It is easy to install on the valve cover 22 and will not have a significant impact on the overall layout of the turbine flow meter. The worm gear drive has self-locking properties and better stability.

[0020] Specifically, a sealing gasket 25 is provided between the valve body 21 and the valve cover 22; this effectively prevents fluid leakage from the gap between the valve body 21 and the valve cover 22, ensuring that the fluid inside the anti-backflow turbine flowmeter flows through the prescribed channel, thereby improving the accuracy of flow measurement and the anti-backflow effect.

[0021] More specifically, the valve body 21 has several first bolts 211 arranged in a ring array along the top opening edge, and the valve cover 22 has mounting holes 221 corresponding to the first bolts 211. Each of the first bolts 211 is screwed with a first lock nut 212 for locking the valve cover 22. The ring array of first bolts 211 and first lock nuts 212 can apply pressure evenly, so that the valve cover 22 is tightly connected to the valve body 21, ensuring that the valve cover 22 will not loosen or fall off under fluid pressure, thus ensuring the normal operation of the anti-backflow turbine flow meter. When it is necessary to repair or replace parts of the anti-backflow turbine flow meter, simply unscrew the first lock nut 212 to remove the valve cover 22 from the valve body 21. The operation is convenient and quick, improving the maintainability of the equipment.

[0022] Furthermore, each of the four corners of the drive housing 41 has a lug 412, and a second bolt 222 is fixedly connected to the valve cover 22 at the position corresponding to the lug 412. A second lock nut 223 for locking the lug 412 is screwed onto the second bolt 222. The combination of the four lugs 412 and the second bolt 222 and the second lock nut 223 enables the drive housing 41 to be stably installed on the valve cover 22. When the motor 44 vibrates during operation, the drive housing 41 will not shake or shift, ensuring the normal operation of the worm gear transmission and improving the working reliability of the drive assembly 4. This fixing method increases the overall structural strength of the anti-backflow turbine flowmeter, makes the connection between the various components tighter, can withstand greater fluid pressure and external impact, and extends the service life of the equipment.

[0023] It should be noted that the top of the drive box 41 is fixed with a cover 411 by screws; when it is necessary to inspect and repair the internal components of the drive assembly 4, simply unscrew the screws and remove the cover 411 to easily inspect, repair or replace components such as the worm gear 42, worm 43, and motor 44, thereby improving the maintainability of the equipment.

[0024] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A backflow prevention turbine flow meter, comprising a turbine flow meter body (1) and a flow sensor (3) fixedly mounted on the turbine flow meter body (1), characterized in that: The turbine flow meter body (1) has an anti-backflow mechanism (2) at its outlet end. The anti-backflow mechanism (2) includes a valve body (21) fixedly connected to the outlet end of the turbine flow meter body (1), a valve cover (22) fixedly installed on the top of the valve body (21), an O-type ball valve (23) rotatably installed in the valve body (21), two sealing rings (24) fixedly installed in the valve body (21) at positions corresponding to both ends of the O-type ball valve (23), and a valve stem (231) fixedly connected to the top of the O-type ball valve (23) and rotatably connected to the valve cover (22) through a sealing bushing. The valve cover (22) is provided with a drive assembly (4) connected to the valve stem (231) for driving the O-type ball valve (23) to rotate to adjust the opening and closing of the valve. The flow sensor (3) and the drive assembly (4) are both connected to an external control system.

2. The anti-backflow turbine flow meter according to claim 1, characterized in that: The drive assembly (4) includes a drive housing (41) fixedly mounted on the valve cover (22), a worm gear (42) rotatably mounted in the drive housing (41), a worm (43) rotatably connected in the drive housing (41) and meshing with the side of the worm gear (42), and a motor (44) fixedly mounted on the side of the drive housing (41) and whose output shaft is connected to the worm (43). The bottom end of the worm gear (42) has a pin (421) that passes through the bottom of the drive housing (41) and is connected to the valve stem (231). The input end of the motor (44) is connected to an external control system.

3. The anti-backflow turbine flow meter according to claim 2, characterized in that: A sealing gasket (25) is provided between the valve body (21) and the valve cover (22).

4. The anti-backflow turbine flow meter according to claim 3, characterized in that: The valve body (21) has a plurality of first bolts (211) arranged in a ring array along the top opening edge. The valve cover (22) has mounting holes (221) corresponding to the first bolts (211). Each of the first bolts (211) is screwed with a first lock nut (212) for locking the valve cover (22).

5. The anti-backflow turbine flow meter according to claim 4, characterized in that: The drive box (41) has lugs (412) at each of the four corners of its side. The valve cover (22) is fixedly connected with a second bolt (222) at the position corresponding to the lug (412). The second bolt (222) is screwed with a second lock nut (223) for locking the lug (412).

6. The anti-backflow turbine flow meter according to claim 5, characterized in that: The top of the drive box (41) is fixed with a box cover (411) by screws.

Images