CN209894226U

CN209894226U - Turbine flowmeter

Info

Publication number: CN209894226U
Application number: CN201920816236.0U
Authority: CN
Inventors: 朱长岭; 朱坤华; 冯林
Original assignee: Jiangsu Jinling Instrument Co Ltd
Current assignee: Jiangsu Jinling Instrument Co Ltd
Priority date: 2019-06-01
Filing date: 2019-06-01
Publication date: 2020-01-03
Anticipated expiration: 2029-06-01

Abstract

The utility model provides a turbine flowmeter. The utility model discloses a casing and setting are in fluid passage in the casing, be provided with the impeller subassembly in the fluid passage, the axle center of impeller subassembly with fluid passage's axle center coincidence, impeller subassembly's both ends have the connecting axle, the end of connecting axle has the magnetic axis, fluid passage the inside through two support frame installation with the magnetic axis is with the axle center and the same magnetic ring of magnetic pole direction, the support frame on be provided with a set of brace rod, the embedded electric heater unit that has, both ends of brace rod the inside the outside of support frame is provided with the filter screen, be provided with the cover on the support frame the outside silicon steel ring of magnetic ring, the top of impeller is provided with permanent magnet steel, permanent magnet steel connection sensor. The utility model discloses avoid the influence to the precision of flowmeter such as solid-state impurity in bearing frictional force, liquid crystallization, the fluid, measuring result is accurate reliable, job stabilization.

Description

Turbine flowmeter

The technical field is as follows:

the utility model relates to a turbine flowmeter belongs to instrument and meter technical field.

Background art:

the turbine flowmeter is the main type of speed flowmeter, when the measured fluid flows through the turbine flowmeter sensor, the impeller is forced to rotate under the action of the fluid, the rotating speed of the impeller is in direct proportion to the average flow speed of the pipeline, meanwhile, the blades periodically cut the magnetic force lines generated by the electromagnet, the magnetic flux of the coil is changed, according to the electromagnetic induction principle, a pulsating potential signal, namely an electric pulse signal, is induced in the coil, and the frequency of the electric pulse signal is in direct proportion to the flow of the measured fluid. Turbine flow meters are widely used for some of the following measurement objects: petroleum, organic liquids, inorganic liquids, liquefied gases, natural gases, coal gases, cryogenic fluids, and the like.

The basic structure of the existing turbine flowmeter is that a vane wheel is directly assembled in a flowmeter shell, and the vane wheel is supported on the central line of a metering cavity by a bearing assembly. When the blade rotates under the push of fluid, the blade cuts the magnetic force line of the permanent magnet steel, the sensor receives and induces the magnetic force line into a pulse signal which is proportional to the flow of the fluid, and the flow data is obtained by collecting the pulse signal.

Problems with such meters are: 1. the impeller rotates with a large friction force, so that the defects of high starting flow, low sensitivity and the like are obviously overcome; 2. for some chemical materials which are easy to crystallize, the chemical materials can be normally measured under the condition of normal temperature, and because the conduits for keeping and conveying the fluid have good heat tracing and heat preservation, the chemical materials cannot be crystallized during heat preservation work, but the side face pipes of the sensor of the turbine flowmeter do not have heat preservation, the impeller is easy to be crystallized due to temperature reduction when the fluid flows through the measuring pipe, and the precision of the flowmeter is influenced; 3. the impact of impurities in the fluid causes the displacement of the impeller, and the measurement precision is influenced.

The invention content is as follows:

the utility model aims at the problem that above-mentioned exists provides a turbine flowmeter, avoids bearing friction, liquid crystallization, the influence to flowmeter's precision such as solid-state impurity in the fluid, and measuring result is accurate reliable, job stabilization.

The above purpose is realized by the following technical scheme:

the utility model provides a turbine flowmeter, includes the casing and sets up fluid passage in the casing, be provided with the impeller subassembly in the fluid passage, the axle center of impeller subassembly with fluid passage's axle center coincidence, the both ends of impeller subassembly have the connecting axle, the end of connecting axle has the magnetic axis, fluid passage the inside through two support frame installation with the magnetic axis is with the axle center and the magnetic pole direction is the same magnetic ring, the support frame on be provided with a set of brace rod, the embedded electric heater unit that has in brace rod the inside, both ends the outside of support frame is provided with the filter screen, be provided with the cover on the support frame the outside silicon steel ring of magnetic ring, the top of impeller is provided with permanent magnet steel, permanent magnet steel connection sensor.

The turbine flowmeter is characterized in that two ends of the shell are provided with connecting flanges.

The turbine flowmeter comprises an impeller assembly and a connecting shaft, wherein the impeller assembly comprises a hub, two ends of the hub are connected with the connecting shaft, and blades are arranged on the hub.

In the turbine flowmeter, the sensor is an electromagnetic sensor.

Has the advantages that:

1. the utility model adopts the magnetic suspension bearing, thus avoiding the defects of high starting flow, low sensitivity and the like caused by the friction force of the bearing; the supporting ribs embedded with the electric heating devices are adopted, so that the defect that the precision of the flowmeter is influenced due to crystallization of the impeller caused by crystallization of easily-crystallized chemical substances is overcome; both ends the outside of support frame is provided with the filter screen and has effectively avoided solid impurity to produce the impeller displacement that piles up the cause on the impeller, influences measurement accuracy's defect for measuring result is accurate reliable, job stabilization.

Description of the drawings:

fig. 1 is a schematic structural diagram of the present invention.

FIG. 1, a housing; 2. a fluid channel; 3. an impeller assembly; 4. a connecting shaft; 5. a magnetic axis; 6. a support frame; 7. a magnetic ring; 8. supporting ribs; 9. a filter screen; 10. a silicon steel ring; 11. permanent magnet steel; 12. a sensor; 13. and (4) a flange.

The specific implementation mode is as follows:

example 1:

as shown in fig. 1: the turbine flowmeter of this embodiment, includes casing 1 and sets up fluid passage 2 in the casing, be provided with impeller subassembly 3 in the fluid passage, impeller subassembly's axle center with fluid passage's axle center coincidence, impeller subassembly's both ends have connecting axle 4, the end of connecting axle has magnetic shaft 5, fluid passage the inside through two support frames 6 install with magnetic shaft is with the axle center and magnetic pole direction the same magnetic ring 7, the support frame on be provided with a set of brace rod 8, the brace rod the inside is embedded to have electric heater unit, both ends the outside of support frame is provided with filter screen 9, be provided with the cover on the support frame the outside silicon steel ring 10 of magnetic ring, the top of impeller is provided with permanent magnet steel 11, permanent magnet steel connection sensor 12. The silicon steel ring in the embodiment has the function of isolating the magnetic field, and the problem that the magnetic field of the magnetic suspension bearing influences the magnetic field of the magnetic steel of the magnetic sensor to influence the measurement precision is solved.

In the turbine flowmeter of the present embodiment, the housing has connecting flanges 13 at both ends.

In the turbine flowmeter of this embodiment, the impeller assembly includes a hub, and both ends of the hub are connected to the connecting shaft, and the hub has blades thereon.

In the turbine flowmeter described in this embodiment, the sensor is an electromagnetic sensor.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the technical means, but also comprises the technical scheme consisting of the equivalent replacement of the technical features. The present invention is not to be considered as the best thing, and belongs to the common general knowledge of the technicians in the field.

Claims

1. A turbine flowmeter, characterized by: including the casing and set up fluid passage in the casing, be provided with the impeller subassembly in the fluid passage, the axle center of impeller subassembly with fluid passage's axle center coincidence, the both ends of impeller subassembly have the connecting axle, the end of connecting axle has the magnetic axis, fluid passage the inside through two support frame installation with the magnetic axis is with the axle center and the same magnetic ring of magnetic pole direction, the support frame on be provided with a set of brace rod, the embedded electric heater unit that has in brace rod the inside, both ends the outside of support frame is provided with the filter screen, be provided with the cover on the support frame the outside silicon steel ring of magnetic ring, the top of impeller is provided with permanent magnet steel, permanent magnet steel connection sensor.

2. A turbine flow meter according to claim 1, wherein: the two ends of the shell are provided with connecting flanges.

3. A turbine flow meter according to claim 1, wherein: the impeller assembly comprises a hub, two ends of the hub are connected with the connecting shaft, and blades are arranged on the hub.

4. A turbine flow meter according to claim 1, wherein: the sensor adopts an electromagnetic sensor.