阅读说明：本技术 带有抛物线形导流装置的涡轮流量计 (Turbine flowmeter with parabolic flow guiding device ) 是由 郑庆煊 郑翌欣 于 2019-09-29 设计创作，主要内容包括：本发明涉及涡轮流量计领域,公开了带有抛物线形导流装置的涡轮流量计,其包括前支架和后支架,前支架内安装有导流装置,导流装置包括换向导流片,换向导流片的轴向投影形状为抛物线形；后支架内安装有叶轮,叶轮包括叶片,叶片的轴向投影形状为直线形。本发明通过换向导流片能够将流入涡轮流量计的流体由进口的轴向速度转变为径向速度,从而驱动叶轮旋转,换向导流片能够使叶轮获得高线性、高效率、与流体成比例的角速度,从而使流体传递给叶轮的轴向作用力接近于零,大大减小轴承的轴向承受力,延长涡轮流量计的使用寿命,提高涡轮流量计线性,延长涡轮流量计的使用寿命。(The invention relates to the field of turbine flowmeters, and discloses a turbine flowmeter with a parabolic flow guide device, which comprises a front support and a rear support, wherein the flow guide device is arranged in the front support and comprises a reversing flow guide sheet, and the axial projection shape of the reversing flow guide sheet is parabolic; the rear bracket is internally provided with an impeller which comprises blades, and the axial projection shape of the blades is linear. The invention can convert the axial speed of the fluid flowing into the turbine flowmeter from the inlet into the radial speed through the reversing guide vane so as to drive the impeller to rotate, and the reversing guide vane can ensure that the impeller obtains the angular speed which is high in linearity and efficiency and is proportional to the fluid, so that the axial acting force transmitted by the fluid to the impeller is close to zero, the axial bearing force of a bearing is greatly reduced, the service life of the turbine flowmeter is prolonged, the linearity of the turbine flowmeter is improved, and the service life of the turbine flowmeter is prolonged.)

1. Turbine flowmeter with parabola shape guiding device, including fore-stock (1) and after-poppet (2), its characterized in that: a flow guide device (3) is installed in the front support (1), the flow guide device (3) comprises a reversing flow guide sheet (31), and the axial projection shape of the reversing flow guide sheet (31) is a parabola shape; an impeller (4) is installed in the rear support (2), the impeller (4) comprises blades (41), and the axial projection shape of the blades (41) is linear.

2. The turbine flowmeter with parabolic deflector of claim 1, wherein: still install core (5) in rear bracket (2), still install main shaft (51) in core (5), bearing (52) are all installed at the both ends of main shaft (51), and bearing (52) fixed mounting is in core (5), and impeller (4) are connected with main shaft (51), and the axial plane of blade (41) is parallel with main shaft (51), and impeller (4) rotate and drive main shaft (51) synchronous revolution.

3. The turbine flowmeter with parabolic deflector of claim 2, wherein: the oil filling machine also comprises an oil filling hole (53), wherein the oil filling hole (53) is formed in the machine core (5), and a sealing ring (54) is installed in the oil filling hole (53) in a matching manner.

4. The turbine flowmeter with parabolic deflector of claim 2, wherein: the magnetic transmission mechanism is characterized by further comprising a machine core rear cover (6), a magnetic transmitter (7) is installed in the machine core rear cover (6), the magnetic transmitter (7) is connected with the main shaft (51), and the main shaft (51) rotates to drive the magnetic transmitter (7) to rotate synchronously.

5. The turbine flowmeter with parabolic deflector of claim 4, wherein: the magnetic transmitter (7) comprises magnetic steel (71), and a shielding gasket (72) for isolating magnetic stress is arranged on the magnetic transmitter (7).

6. The turbine flowmeter with parabolic deflector of claim 4, wherein: the magnetic core is characterized by further comprising a core seat (8) used for installing the core (5), the core rear cover (6) is hermetically connected with the core seat (8), and the core rear cover (6) is made of a POM non-magnetic material.

7. The turbine flowmeter with parabolic deflector of claim 6, wherein: the movement seat (8) is fixedly connected with the rear bracket (2) through a screw.

8. The turbine flowmeter with parabolic deflector of claim 4, wherein: the back cover (6) of the machine core comprises a signal pickup surface (61), and the signal pickup surface (61) is a plane.

9. The turbine flowmeter with parabolic deflector of claim 1, wherein: the number of the reversing guide vanes (31) is 8-20.

10. The turbine flowmeter with parabolic deflector of claim 1, wherein: the front support (1) and the rear support (2) are in threaded connection.

Technical Field

The invention relates to the field of turbine flowmeters, in particular to a turbine flowmeter with a parabolic flow guide device.

Background

The gas turbine flowmeter is mainly used for gas flow metering of pipelines with diameters larger than or equal to 50 mm. With the promotion of urban pipeline gas construction and coal-to-gas engineering of western gas transportation in China, the gas turbine flowmeter is widely used and developed in the aspects of gas flowmeter flow and the like.

Turbine flow measurement in the existing market is that the gas to be measured flows into turbine flow timing, directly passes through straight lamellar rectifier voltage-sharing rectification earlier, then when the impeller is flowed through to the air current, because impeller blade and turbine flow meter center pin are formed with certain contained angle to make the impeller rotatory under the air current promotes, the impeller passes through the main shaft and drives the magnet steel rotation, and rotate through the magnet steel and produce magnetic pulse, the velocity of flow of the data reflection fluid through instrument display at last. According to the structure, when the gas flow of the turbine flowmeter is large, particularly when the initial flow is large, the impeller can bear a large axial acting force, the axial acting force is transmitted to the bearing, and the bearing is abraded to a large extent, so that the precision of the turbine flowmeter is reduced, and the service life of the turbine flowmeter is greatly shortened.

Chinese patent No. CN 207763755U discloses a flow director for a turbine flow meter, which includes a leading fluid and a trailing fluid, the leading fluid includes a leading fluid central shaft, a flow director flow deflector, a leading fluid bearing, a leading fluid retainer ring and a leading fluid adjusting shim, the leading fluid flow deflector is symmetrically disposed on the peripheral side of the leading fluid central shaft along the axis of the leading fluid central shaft, the trailing fluid includes a trailing fluid central shaft, a trailing fluid flow deflector, a trailing fluid bearing, a trailing fluid retainer ring and a trailing fluid adjusting shim, the trailing fluid flow deflector is symmetrically disposed on the peripheral side of the trailing fluid central shaft along the axis of the trailing fluid central shaft. The utility model provides a divertor can reduce the turbulent flow and the swirl that the fluid produced, makes the fluid can pass through the impeller of flowmeter with basically even speed profile. But this utility model when gas flow is great, the axial load power of bearing is big, easily causes bearing wear to reduce turbine flowmeter precision, shorten turbine flowmeter life greatly.

Disclosure of Invention

The invention provides a turbine flowmeter with a parabolic flow guide device, which can reduce the axial load force of a bearing and has long service life, aiming at the defects that the bearing of the turbine flowmeter in the prior art is large in axial load force, easy to wear, low in precision and short in service life.

In order to solve the technical problem, the invention is solved by the following technical scheme:

The turbine flowmeter with the parabolic flow guide device comprises a front support and a rear support, wherein the flow guide device is installed in the front support and comprises a reversing flow guide sheet, and the axial projection shape of the reversing flow guide sheet is parabolic; the rear bracket is internally provided with an impeller which comprises blades, and the axial projection shape of the blades is linear. The reversing guide vane with the parabolic axial projection shape can convert the axial speed of fluid flowing into the turbine flowmeter from the inlet into the radial speed so as to drive the impeller to rotate, and the reversing guide vane with the parabolic axial projection shape can enable the impeller to obtain the angular speed which is high in linearity and efficiency and proportional to the fluid, so that the axial acting force transmitted by the fluid to the impeller is close to zero, the axial bearing capacity of a bearing is greatly reduced, and the service life of the turbine flowmeter is prolonged; compared with the spiral blade of the traditional worm wheel flowmeter impeller, the axial surface of the blade and the parallel axial projection shape of the main shaft are linear, so that the axial bearing acting force of the bearing can be eliminated, the linearity of the turbine flowmeter is improved, and the service life of the turbine flowmeter is prolonged.

Preferably, a machine core is further installed in the rear support, a main shaft is further installed in the machine core, bearings are installed at two ends of the main shaft, the bearings are fixedly installed in the machine core, the impeller is connected with the main shaft, the axial surfaces of the blades are parallel to the main shaft, and the impeller rotates to drive the main shaft to rotate synchronously. The axial surface of the blade is parallel to the main shaft, and the impeller is not impacted by the airflow axial acting force, so that the bearing has no axial load force, the assembly stress is eliminated, and the service life of the whole machine is prolonged.

Preferably, the oil filling machine further comprises an oil filling hole, wherein the oil filling hole is formed in the machine core, and a sealing ring is installed in the oil filling hole in a matched mode. Lubricating oil is filled from the oil filling hole, the oil filling hole is formed in the machine core and is provided with the sealing ring in a matched mode, lubrication and maintenance convenience of the bearing can be guaranteed, the cavity where the bearing is located is sealed relatively, and the bearing is not prone to being polluted by fluid impurities.

preferably, the magnetic transmission mechanism further comprises a machine core rear cover, a magnetic transmitter is installed in the machine core rear cover and connected with the main shaft, and the main shaft rotates to drive the magnetic transmitter to rotate synchronously. The magnetic transmitter rotates to generate a pulse signal.

Preferably, the magnetic transponder comprises magnetic steel, and a shielding gasket for isolating magnetic stress is arranged on the magnetic transponder. The magnetic steel is used for picking up signals, and the shielding gasket is used for isolating magnetic stress and shielding magnetic interference, so that the magnetic stress does not act on the ferromagnetic bearing, the linearity of instruments and meters is ensured, and the precision is improved.

Preferably, the machine core device also comprises a machine core seat used for installing the machine core, wherein a rear cover of the machine core is hermetically connected with the machine core seat and is made of POM nonmagnetic material. The rear cover of the machine core is connected with the machine core seat in a sealing manner, so that a sealing environment is further ensured, the cavity where the bearing is located is relatively sealed, and the rear cover of the machine core can better protect the bearing from being lubricated and also has a good dustproof effect.

Preferably, the movement seat is fixedly connected with the rear bracket through a screw.

Preferably, the back cover of the movement comprises a signal pickup surface, and the signal pickup surface is a plane. The signal pickup surface is convenient for picking up signals.

Preferably, the number of the reversing guide vanes is 8-20.

Preferably, the front bracket and the rear bracket are in threaded connection. The threaded connection is easy to install and disassemble and has good tightness.

Due to the adoption of the technical scheme, the invention has the remarkable technical effects that: the invention has simple structure, and the axial acting force born by the bearing is converted into radial acting force by skillfully combining the reversing guide vane with the parabolic axial projection shape and the impeller with the linear axial projection shape of the blade, so that the assembly stress is eliminated, and the service life of the turbine flowmeter is greatly prolonged; the oil filling hole is formed in the machine core, the sealing ring is installed in a matched mode, and the rear cover of the machine core is connected with the machine core seat in a sealing mode, so that a cavity where the bearing is located is relatively sealed, the bearing is convenient to lubricate and maintain, and the bearing is not easily polluted by impurities; the magnetic steel of the magnetic transmitter is matched with the shielding washer, and the signal pickup surface is arranged to be a plane structure, so that the signal pickup is easy, the magnetic interference can be shielded, the linearity of an instrument is ensured, and the measurement precision is improved; and the whole structure is simple, the installation is convenient, and the wear resistance and the long service life are realized.

Drawings

Fig. 1 is a schematic structural view of a turbine flowmeter.

Fig. 2 is a schematic structural view of the deflector.

Fig. 3 is a schematic structural view of a reversing guide vane.

Fig. 4 is a schematic structural view of the impeller.

FIG. 5 is a schematic diagram of a magnetic transponder.

Fig. 6 is a schematic structural diagram of a rear cover of the movement.

The names of the parts indicated by the numerical references in the drawings are as follows: 1-front support, 2-rear support, 3-guiding device, 31-reversing guide vane, 4-impeller, 41-blade, 5-movement, 51-main shaft, 52-bearing, 53-oil filling hole, 54-sealing ring, 6-movement rear cover, 61-signal picking surface, 7-magnetic transmitter, 71-magnetic steel, 72-shielding gasket and 8-movement seat.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.