CN209802422U

CN209802422U - Turbine flowmeter

Info

Publication number: CN209802422U
Application number: CN201920903758.4U
Authority: CN
Inventors: 林陈
Original assignee: ZHEJIANG KEYAO PETROLEUM MACHINERY CO Ltd
Current assignee: ZHEJIANG KEYAO PETROLEUM MACHINERY CO Ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2019-12-17
Anticipated expiration: 2029-06-14

Abstract

The utility model discloses a turbine flowmeter, including the flowmeter body, the internal measurement storehouse that has of flowmeter, install installing support and turbine subassembly in the measurement storehouse, turbine subassembly is including impeller, center pin, the impeller is including blade and quill shaft, the quill shaft runs through fixed mounting and has the guide axle sleeve, the center pin penetrates in the guide axle sleeve and rotates with the guide axle sleeve and be connected, the sealing member that is used for sealing up clearance between center pin and the guide axle sleeve is installed respectively at the both ends of guide axle sleeve. Under the prerequisite that does not influence the impeller pivoted, with center pin seal installation in the direction shaft sleeve, avoid the impact and the contact of fluid to the center pin, prevent that the center pin from being corroded the poor phenomenon of impeller rotation flexibility that leads to and taking place, make the measurement more permanent accurate, still prolonged the life of product.

Description

Turbine flowmeter

Technical Field

the utility model relates to a measurement field specifically is a turbine flowmeter.

Background

a turbine flowmeter is a device for detecting the flow of a liquid, and generally comprises a tubular housing, in the center of which is placed a turbine, also called an impeller, supported at both ends by bearings. When fluid passes through the pipeline, the fluid impacts turbine blades to generate driving torque on the turbine, so that the turbine overcomes friction torque and fluid resistance torque to generate rotation. Within a certain flow range, the rotational angular velocity of the turbine is directly proportional to the fluid flow rate for a certain fluid medium viscosity. Thus, the fluid flow rate can be obtained from the rotational angular velocity of the turbine, and the fluid flow through the conduit can be calculated. Therefore, the shape of the turbine and the flow state of the fluid are main factors affecting the accuracy. However, after the existing turbine flowmeter is used for a long time, the fluid can corrode a main shaft of the turbine, the flexibility of the turbine can be weakened, and the accuracy of measurement is affected. In addition, the flow state of the fluid passing through the turbine has a great influence on the accuracy, and the existing turbine flow meter is generally provided with mounting brackets at the front and the rear of the turbine for mounting the turbine, but the mounting bracket in the upstream direction easily causes water hammer, so that the fluid flow is more disordered, and the measurement is not accurate enough.

Disclosure of Invention

The utility model aims at: in order to overcome the defects of the prior art, the utility model provides a turbine flowmeter with long service life and more accurate measurement.

The technical scheme of the utility model: including the flowmeter body, the internal measurement storehouse that has of flowmeter, install installing support and turbine subassembly in the measurement storehouse, turbine subassembly is including impeller, center pin, the impeller is including blade and quill shaft, the quill shaft runs through fixed mounting and has the guide shaft sleeve, the center pin penetrates in the guide shaft sleeve and rotates with the guide shaft sleeve to be connected, the sealing member that is used for sealed center pin and guide shaft sleeve clearance is installed respectively at the both ends of guide shaft sleeve.

By adopting the technical scheme, the central shaft is hermetically arranged in the guide shaft sleeve on the premise of not influencing the rotation of the impeller, so that the impact and the contact of fluid on the central shaft are avoided, the phenomenon that the rotation flexibility of the impeller is poor due to the corrosion of the central shaft is prevented, the measurement is more permanent and accurate, and the service life of a product is also prolonged.

The utility model discloses a further setting: the central shaft is provided with a mounting section exposed outside the guide shaft sleeve, the mounting section is located in the downstream direction of the impeller, and the mounting bracket is provided with only one and is mounted on the mounting section.

By adopting the further arrangement, only one mounting bracket is arranged in the downstream direction, the influence of the mounting bracket on the fluid is avoided, and the measurement accuracy is higher.

The utility model discloses a further setting again: the mounting bracket is in a T-shaped panel shape and comprises a middle part connected with the central shaft and side parts positioned on two sides of the middle part, a through hole for the mounting section of the central shaft to penetrate is formed in the middle part, a plurality of elastic cylindrical pins are inserted and mounted in the middle part and positioned on two sides of the through hole and abut against the central shaft in the through hole.

By adopting the above further arrangement, the elastic energy of the elastic cylindrical pin can buffer the vibration and impact of the fluid on the central shaft, thereby avoiding the damage of the central shaft and prolonging the life cycle of the product to the maximum extent.

The utility model discloses a still further set up: a groove is formed in the inner wall of the metering bin, and the length direction of the groove extends from the outlet of the metering bin to the side part of the mounting bracket; the side part is in clearance fit with the metering bin, a fixed pressing plate is installed on the side part in a threaded mode, the fixed pressing plate extends into the groove and is fixed on the groove through screws.

Adopt above-mentioned still further setting, the dismouting installing support of being convenient for makes to overhaul turbine assembly convenient more convenient.

The utility model discloses a still further set up: the inlet direction of the flowmeter body is provided with a bent joint, a first rectifier is arranged in the bent joint, and a second rectifier which is coaxially aligned with the first rectifier is arranged at the inlet of the flowmeter body.

By adopting the above further arrangement, the combined installation of the bent joint and the first rectifier can force the flowing state of the fluid to be close to laminar flow from turbulent flow, and the second rectifier is further added for rectification again, so that the rectification effect is obvious, errors caused by flowing disorder are avoided, and the measurement precision is improved.

The utility model discloses a still further set up: the first rectifier and the second rectifier are both in a honeycomb structure.

by adopting the above further arrangement, the honeycomb structure has better rectification effect and has a filtering function.

The utility model discloses a still further set up: the outlet of the flowmeter body is provided with a perspective flange with perspective effect, the perspective flange comprises a flange shell and a transparent glass tube in the flange shell, and the flange shell is provided with a perspective port.

With the above still further arrangement, the fluid flow can be observed.

The utility model discloses a still further set up: the sealing element is a graphite sleeve made of graphite.

Adopt above-mentioned further setting again, the graphite sleeve has lubricated and sealed effect concurrently, reasonable in design.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2 in accordance with the present invention;

FIG. 4 is an exploded view of an embodiment of the present invention;

The flowmeter comprises a flowmeter body 1, a metering bin 11, a mounting bracket 2, a turbine assembly 3, an impeller 31, a central shaft 32, blades 311, a hollow shaft 312, a guide shaft sleeve 313, a sealing element 314, a mounting section 321, a middle part 21, a side part 22, a through hole 211, an elastic cylindrical pin 212, a groove 111, a fixed pressing plate 23, a screw 24, a bent joint 4, a first rectifier 41, a second rectifier 12, a perspective flange 5, a flange shell 51, a transparent glass tube 52 and a perspective port 511.

Detailed Description

As shown in fig. 1-4, the turbine flowmeter includes a flowmeter body 1, a metering chamber 11 is provided in the flowmeter body 1, a mounting bracket 2 and a turbine assembly 3 are installed in the metering chamber 11, the turbine assembly 3 includes an impeller 31 and a central shaft 32, the impeller 31 includes a blade 311 and a hollow shaft 312, the hollow shaft 312 is fixedly installed through a guide shaft sleeve 313, the central shaft 32 penetrates into the guide shaft sleeve 313 and is rotatably connected with the guide shaft sleeve 313, sealing members 314 for sealing a gap between the central shaft 32 and the guide shaft sleeve 313 are respectively installed at two ends of the guide shaft sleeve 313, the sealing members 314 are graphite sleeves made of graphite, so that the guide shaft sleeve 313 can rotate on the central shaft 32, the rotation resistance is very small, the turbine flowmeter is durable, the central shaft can be kept undamaged for a long time, and the service life is very long.

The central shaft 32 is provided with an installation section 321 exposed outside the guide shaft sleeve 313, the installation section 321 is located in the downstream direction of the impeller 31, the installation supports 2 are only provided with one installation section 321, fluid flows into the metering bin 11 and passes through the impeller 31 and then the installation supports 2, the layout of the installation supports 2 is reduced, and the influence of the installation supports in front of the impeller on the measurement accuracy is avoided.

The mounting bracket 2 is in a shape of a T-shaped panel, and includes a middle portion 21 connected to the central shaft 32 and side portions 22 at positions on both sides of the middle portion 21, a through hole 211 for the mounting section 321 of the central shaft 32 to penetrate through is formed in the middle portion 21, a plurality of elastic cylindrical pins 212 are inserted and mounted in the middle portion 21, and the elastic cylindrical pins 212 are located on both sides of the through hole 211 and abut against the central shaft 32 in the through hole 211. The elastic properties of the elastic cylindrical pin 212 dampen the vibration and impact of the fluid on the central shaft 32 when the fluid flow rate is fast.

A groove 111 is formed in the inner wall of the metering bin 11, and the length direction of the groove 111 extends from the outlet of the metering bin 11 to the position of the side portion 22 of the mounting bracket 2; the side portion 22 is in clearance fit with the measuring bin 11, the side portion 22 is provided with a fixed pressing plate 23 in a threaded mode, and the fixed pressing plate 23 extends into the groove 111 and is fixed on the groove 111 through a screw 24. The screws 24 are screwed off, and the fixed pressing plate 23 can slide out on the grooves 111, so that the mounting bracket 2 is removed, and the turbine assembly 3 and the mounting bracket 2 can be overhauled.

The inlet direction of the flowmeter body 1 is provided with a bent joint 4, a first rectifier 41 is arranged in the bent joint, the inlet of the flowmeter body 1 is provided with a second rectifier 12 coaxially aligned with the first rectifier 41, and the first rectifier 41 and the second rectifier 12 are both in a regular hexagon honeycomb structure. The combination installation of the bent joint 4 and the first rectifier 41 can force the flowing state of the fluid to be close to laminar flow from turbulent flow, and further the second rectifier 12 is additionally arranged for rectification again, so that the rectification effect is obvious, errors caused by flowing disorder are avoided, and the measurement precision is improved. The honeycomb structure has good rectification effect and has a filtering function.

The perspective flange 5 with the perspective effect is installed at the outlet of the flowmeter body 1, the perspective flange 5 comprises a flange shell 51 and a transparent glass tube 52 in the flange shell 51, a perspective port 511 is formed in the flange shell 51, and the flowing condition of the internal fluid can be observed through the transparent glass tube 52 of the perspective port 511.

Claims

1. The utility model provides a turbine flowmeter, is including the flowmeter body, and the internal measurement storehouse that has of flowmeter, install installing support and turbine subassembly in the measurement storehouse, its characterized in that: the turbine assembly comprises an impeller and a central shaft, the impeller comprises blades and a hollow shaft, the hollow shaft penetrates through and is fixedly provided with a guide shaft sleeve, the central shaft penetrates into the guide shaft sleeve and is rotatably connected with the guide shaft sleeve, and sealing elements used for sealing a gap between the central shaft and the guide shaft sleeve are respectively arranged at two ends of the guide shaft sleeve.

2. The turbine flow meter of claim 1, wherein: the central shaft is provided with a mounting section exposed outside the guide shaft sleeve, the mounting section is located in the downstream direction of the impeller, and the mounting bracket is provided with only one and is mounted on the mounting section.

3. The turbine flow meter of claim 2, wherein: the mounting bracket is in a T-shaped panel shape and comprises a middle part connected with the central shaft and side parts positioned on two sides of the middle part, a through hole for the mounting section of the central shaft to penetrate is formed in the middle part, a plurality of elastic cylindrical pins are inserted and mounted in the middle part and positioned on two sides of the through hole and abut against the central shaft in the through hole.

4. The turbine flowmeter of claim 3, wherein: a groove is formed in the inner wall of the metering bin, and the length direction of the groove extends from the outlet of the metering bin to the side part of the mounting bracket; the side part is in clearance fit with the metering bin, a fixed pressing plate is installed on the side part in a threaded mode, the fixed pressing plate extends into the groove and is fixed on the groove through screws.

5. The turbine flowmeter of claim 1 or 4, characterized in that: the inlet direction of the flowmeter body is provided with a bent joint, a first rectifier is arranged in the bent joint, and a second rectifier which is coaxially aligned with the first rectifier is arranged at the inlet of the flowmeter body.

6. The turbine flowmeter of claim 5, wherein: the first rectifier and the second rectifier are both of honeycomb structures.

7. the turbine flowmeter of claim 1 or 4, characterized in that: the outlet of the flowmeter body is provided with a perspective flange with a perspective effect, the perspective flange comprises a flange shell and a transparent glass tube in the flange shell, and the flange shell is provided with a perspective port.

8. The turbine flowmeter of claim 1 or 4, characterized in that: the sealing element is a graphite sleeve made of graphite.