CN205388491U - Gaseous turbine flowmeter of a main shaft signal sending disk body structure - Google Patents

Abstract

The utility model provides a gas turbine flowmeter with an integral structure of a main shaft signal sending plate, which includes a housing, and a leading fluid and a rear guiding fluid are arranged in the housing, and the leading fluid and the rear guiding fluid constitute a guiding fluid. 1. A turbine is arranged between the rear guide body, and the turbine is fixedly arranged in the casing through the main shaft, and can be rotated in a circumferential direction. The two ends of the main shaft are arranged on the front and rear guide bodies, and the main shaft is located between the front and rear guide bodies. There is a groove on one side of the center, and the magnet of the sending disk is embedded in the groove. In the utility model, the magnet for sending the signal from the sending disk is directly embedded in the main shaft and placed between the bearings at both ends to avoid The effect of the large centrifugal force caused by setting the sending disc at the rear end of the main shaft is minimized.

Description

A gas turbine flowmeter with an integral structure of the main shaft and the sending plate

technical field

The utility model relates to the field of metering, in particular to a gas turbine flowmeter with an integral structure of a main shaft and a sending plate.

Background technique

Most of the existing gas turbine flowmeter main shaft and rear guide body are made of metal. With the air flow, the turbine drives the main shaft and the sending plate placed at the rear end of the bearing to rotate at high speed in the rear guide body. The rear diversion body collects pulse signals. However, after the sending disk rotates at high speed, a phenomenon similar to the Hall effect will be generated inside the metal rear guide body. At the same time, the sending plate suspended at the rear end of the main shaft will generate a large centrifugal force under high-speed rotation, and the main shaft will undergo slight deformation, which will increase the resistance on the bearing and affect the measurement accuracy of the turbine flowmeter. In the end, there will be problems such as unstable detection signal and large signal fluctuation, which will even affect the service life of the flowmeter.

Utility model content

The technical problem to be solved by the utility model is to provide a gas turbine flowmeter with an integrated structure of a main shaft and a signal-sending disc in view of the current state of the prior art.

The utility model provides a gas turbine flowmeter with an integral structure of a main shaft signal sending plate, which includes a housing, and a leading fluid and a rear guiding fluid are arranged in the housing, and the leading fluid and the rear guiding fluid constitute a guiding fluid. 1. A turbine is arranged between the rear guide body, and the turbine is fixedly arranged in the casing through the main shaft, and can be rotated in a circumferential direction. The two ends of the main shaft are arranged on the front and rear guide bodies, and the main shaft is located between the front and rear guide bodies. One side of the center is provided with a groove, and the magnet of the sending disc is inlaid in the groove.

Two grooves are symmetrically arranged on the main shaft.

The material of the main shaft is metal material other than paramagnetic material.

Precision bearings are arranged at the positions where the main shaft is in contact with the front and rear guide bodies.

A high-pressure oil supply system is set at the precision bearing.

A magnetic sensitive sensor is arranged at the magnet of the sending disc.

Two high-frequency components are arranged at the turbine.

The utility model embeds the signal-emitting magnet of the sending disc directly in the main shaft to form a whole, and places it between the bearings at both ends, avoiding the effect of large centrifugal force caused by setting the sending disc at the rear end of the main shaft.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of the utility model.

Fig. 2 is an internal schematic diagram of the utility model.

FIG. 3 is an enlarged schematic view of point A in FIG. 2 .

Figure 4 is a simplified schematic diagram of the housing.

Fig. 5 is a structural schematic diagram of the main shaft.

detailed description

Below in conjunction with accompanying drawing, the utility model embodiment is further described:

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the utility model provides a gas turbine flowmeter with an integral structure of the main shaft and the sending plate, which includes a housing 2, and a volume corrector is arranged on the housing 1. The housing 2 is provided with a leading body 4 and a rear guiding body 5, the leading body 4 and the rear guiding body 5 constitute a guiding body, and a turbine 6 is arranged between the front and rear guiding bodies, and the turbine 6 passes through The main shaft is fixedly arranged in the housing 2, and can be rotatably matched in the circumferential direction. The two ends of the main shaft 7 are arranged on the front and rear guide bodies, and a groove 15 is provided on the side between the front and rear guide bodies on the main shaft. The sending disk magnet 8 is embedded in the groove 15 . The magnet of the sending disc is directly fixed in the groove of the main shaft by inlaying. Compared with fixing the sending disc at the end of the main shaft in the past, it will not generate a large centrifugal force under high-speed rotation, and the centrifugal force will be reduced. The main shaft will be slightly deformed, which will increase the resistance of the bearing and affect the measurement accuracy of the turbine flowmeter. Moreover, the integrated structure of the main shaft and the sending disk magnet can ensure the overall streamlined shape of the main shaft, which greatly reduces the impact force on the main shaft.

Two grooves 15 are symmetrically arranged on the main shaft, that is, one or more sending disk magnets 8 can be arranged according to the requirement.

The material of the main shaft is metal material other than paramagnetic material. The definition of paramagnetic material: molecules with unpaired electrons must be arranged along the direction of the magnetic field in an external magnetic field. This property of molecules is called paramagnetism, and substances with this property are called paramagnetic substances.

Precision bearings 10 are arranged at the positions where the main shaft is in contact with the front and rear deflectors. A high-pressure oil supply system 11 is set at the precision bearing, and the high-pressure oil supply system includes a high-pressure oil pump, double check valves, built-in oil pipes and built-in oil circuits of the machine core.

Two high-frequency components 3 are arranged at the turbine, arranged on one side of the turbine in turn, and the high-frequency components are electrically connected to the volume corrector, and the volume corrector 1 is equipped with two high-frequency components 3 for receiving, processing and calculating and The ability of the magnetic sensor 9 to output signals, the volume corrector 1 includes a judging module, the judging module detects the phase difference between two high-frequency components, and judges the forward and reverse rotation of the turbine.

The two high-frequency components 3 collect turbine rotation signals at the same time, and the signals collected by the two high-frequency components 3 are dislocated so that there is a phase difference. The phase difference is judged by the judgment module, and the forward and reverse rotation of the turbine is judged by this. The volume corrector has a wireless connection module, or a wired network connection module, which can directly communicate with the service end of the gas company, so the data obtained by the volume corrector can be transferred to the service end of the gas company.

Therefore, the housing is provided with a magnetic sensor near the direction of the main shaft, and the corresponding sending disk magnet 8 of the magnetic sensor 9 is embedded on the main shaft for sending the data detected by the magnetic sensor. The pulse signal output of the sensitive sensor is proportional to a constant constant, which is related to the number of turbine blades and the number of magnetic pole pairs of the sending disc, so the volume corrector can directly receive and process the pulse signal output by the magnetic sensor in real time, and According to the change of the pulse signal output by the magnetic sensor, it is judged whether there is a jump in the constant constant between the signal output by the high-frequency component, and by detecting whether there is a jump, it is judged whether the blade of the turbine is intact.

The body of the gas flowmeter is provided with a deceleration mechanism and a mechanical counting wheel, and a reed switch 14 is arranged at the deceleration mechanism, and the reed switch 14 is connected with the low-frequency sending disc 13, and the reed switch is used for judging the intermediate Whether there is a transmission ratio multiple relationship between the transmission ratio of several sets of gear sets and the preset instrument coefficient, that is, whether the transmission ratio of the reduction mechanism matches the constant constant of the high-frequency component or the magnetic sensor, and can also be passed through the instrument head Performs data calculations and displays instantaneous volume flow.

The embodiment should not be regarded as limiting the utility model, but any improvement based on the spirit of the utility model should be within the protection scope of the utility model.

Claims (7)

1. A gas turbine flowmeter with an integrated structure of the main shaft signaling disc, which includes a housing, in which a leading fluid and a rear guiding fluid are arranged, and the leading fluid and the rear guiding fluid constitute the guiding fluid, and the front and rear A turbine is arranged between the guide bodies, and the turbine is fixedly arranged in the casing through the main shaft, and can be rotatably matched in the circumferential direction. The two ends of the main shaft are arranged on the front and rear guide bodies, and it is characterized in that: A groove is arranged on one side between the fluids, and a sending disk magnet is embedded in the groove. 2 . The gas turbine flowmeter with an integral structure of a main shaft and a sending plate according to claim 1 , wherein two grooves are symmetrically arranged on the main shaft. 3 . 3 . The gas turbine flowmeter with an integral structure of a main shaft and a sending plate according to claim 1 , wherein the material of the main shaft is a metal material other than paramagnetic materials. 4 . 4. The gas turbine flowmeter with an integral structure of the main shaft and the sending plate according to claim 1, characterized in that: the position where the main shaft is in contact with the front and rear guide bodies is provided with precision bearings. 5. The gas turbine flowmeter with an integral structure of the main shaft and the sending plate according to claim 4, characterized in that: a high-pressure oil supply system is arranged at the precision bearing. 6 . The gas turbine flowmeter with an integral structure of a main shaft and a sending disk according to claim 1 , wherein a magnetic sensor is arranged at the magnet of the sending disk. 7 . 7. The gas turbine flowmeter with an integral structure of the main shaft and the sending plate according to claim 1, characterized in that two high-frequency components are arranged at the turbine.