CN114777853A - Turbine flowmeter for measuring micro gas flow - Google Patents

Abstract

A turbine flowmeter for measuring tiny gas flow, comprising a sensor housing, the upper end of the sensor housing is connected to a converter through an amplifier, the inlet end and the outlet end of the sensor housing are provided with horizontal pipes, and the sensor housing A stepped through hole is arranged in the body, the inlet end and the outlet end of the stepped through hole are large-diameter sections, and the middle is a small-diameter section, and a variable-diameter section is arranged between the small-diameter section and the inlet end; the inlet end A co-rotator is set inside, a guide frame is set in the outlet end, one end of the guide frame is inserted into the small-diameter section of the stepped through hole, an impeller is located in the small-diameter section, and both ends of the shaft of the impeller are respectively supported in the small diameter section. In the shaft hole set on the spinner and the guide frame. The invention provides a turbine flowmeter for measuring micro gas flow, which solves the problems of high detection difficulty, low detection efficiency, low measurement accuracy and low service life when measuring micro gas flow.

Description

Turbine flowmeter for measuring tiny gas flow

technical field

The invention relates to the technical field of flow measurement, in particular to a turbine flowmeter for measuring tiny gas flow.

Background technique

Turbine flowmeter is a kind of velocity flowmeter. When the measured fluid flows through the turbine flowmeter sensor, under the action of the fluid, the impeller is forced to rotate, and its rotational speed is proportional to the average flow velocity of the pipeline. At the same time, the blades are periodically cut. The magnetic field lines generated by the electromagnet change the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating potential signal, that is, an electric pulse signal, will be induced in the coil. The frequency of this electric pulse signal is proportional to the flow rate of the fluid being measured. The formula for the frequency of the electrical pulse signal and the flow rate of the fluid to be measured is as follows:

In the formula, Q is the flow rate of the fluid to be measured, f is the frequency of the electrical pulse signal, and K is the proportionality coefficient.

Turbine flowmeters are widely used in the following measurement objects: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas and cryogenic fluids.

Since the turbine flowmeter is a velocity flowmeter, when measuring the small gas flow, the low flow rate of the measured fluid makes the impeller rotate slowly, resulting in a low frequency of the blades cutting the magnetic field lines, so that the generated electrical pulse signal cannot be detected or detected. decrease, so that the flow rate of the fluid being measured cannot be measured or a larger measurement error occurs. When measuring tiny gas flow, small-diameter turbine flowmeters are usually used for measurement. The components of small-diameter turbine flowmeters are smaller in volume. Therefore, when the components are worn, the impact on measurement accuracy is greater, resulting in reduced measurement accuracy. Therefore, the small-diameter turbine flowmeter has a lower service life and cannot accurately detect the flow rate for a long time.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a turbine flowmeter for measuring tiny gas flow, which solves the problems of high detection difficulty, low detection efficiency, low measurement accuracy and low service life when measuring tiny gas flow.

The object of the present invention is achieved in this way:

A turbine flowmeter for measuring tiny gas flow, comprising a sensor housing, the upper end of the sensor housing is connected to a converter through an amplifier, the inlet end and the outlet end of the sensor housing are provided with horizontal pipes, and the sensor housing A stepped through hole is arranged in the body, the inlet end and the outlet end of the stepped through hole are large diameter sections, the middle is a small diameter section, and a variable diameter section is arranged between the small diameter section and the inlet end; the inlet end A co-rotator is set inside, a guide frame is set at the outlet end, one end of the guide frame is inserted into the small diameter section of the stepped through hole, an impeller is located in the small diameter section, and the two ends of the shaft of the impeller are respectively supported in the small diameter section. In the shaft hole provided on the spinner and the guide frame; the diameter of the horizontal nozzle at the inlet end is the same as the large diameter section of the stepped through hole, the pipe hole of the horizontal nozzle at the outlet end is a stepped hole, and the upstream of the stepped hole is the small diameter end, the diameter of the small diameter end is smaller than the diameter of the small diameter section of the stepped through hole of the sensor housing, and the diameter of the large diameter end downstream of the stepped hole is the same as the diameter of the horizontal nozzle of the inlet end.

Both ends of the shaft of the impeller are respectively supported in the shaft holes on the spinner and the guide frame through a thrust bearing and a sliding bearing.

The spinner is provided with a plurality of helical spinning blades around the axis, and a flow channel is formed between two adjacent spinning blades. One end of the spinner is provided with a fixing ring. The fixing ring and the spinning blades Fixed connection, the spinner is fixedly connected with the sensor housing through the fixing ring, and the other end of the spinner is provided with a shaft hole for installing the bearing.

The number of spinning blades of the spinner is not less than four.

The guide frame includes a central column, and at least three support sheets for guiding are arranged on the circumference of the central column. A positioning ring is located at the downstream end of the guide frame and is fixedly connected to the support sheet, and the positioning ring is located on the sensor housing. The outlet end of the stepped through hole is fixed with the sensor housing, and the upstream end of the central column is provided with a shaft hole for installing the bearing.

The positioning ring of the guide frame is fixed with the sensor housing through a positioning pin.

The diameter-reducing section of the stepped through hole of the sensor housing gradually decreases in diameter from the inlet end to the direction of the small-diameter section.

The impeller is fixed on an impeller shaft.

The upstream end of the horizontal pipe at the inlet end is provided with a connecting flange, and the downstream end is fixedly connected with the sensor shell through a ferrule; the upstream end of the horizontal pipe at the outlet end is fixedly connected with the sensor shell through a ferrule, and the downstream end is There are connecting flanges.

Gaskets are provided between the horizontal pipe at the inlet end, the horizontal pipe at the outlet end and the sensor housing.

The present invention provides a turbine flowmeter for measuring tiny gas flow, comprising a sensor housing, the upper end of the sensor housing is connected to a converter through an amplifier, and the inlet and outlet ends of the sensor housing are provided with horizontal pipes, so The sensor housing is provided with a stepped through hole, the inlet end and the outlet end of the stepped through hole are large-diameter sections, the middle is a small-diameter section, and a variable-diameter section is arranged between the small-diameter section and the inlet end; The inlet end is provided with a co-rotator, and the outlet end is provided with a guide frame, one end of the guide frame is inserted into the small diameter section of the stepped through hole, an impeller is located in the small diameter section, and both ends of the shaft of the impeller are located in the small diameter section. They are respectively supported in the shaft holes provided on the spinner and the guide frame; when the tiny gas passes through the spinner to form a vortex flow, the vortex flow is accelerated through the variable diameter section inside the sensor housing to form a high-speed vortex flow, thereby The gas flow rate in the sensor shell is increased, thereby increasing the rotation speed of the impeller, so that the small gas flow rate can be effectively measured, and the detection efficiency and measurement accuracy are improved. The diameter of the horizontal pipe at the inlet end is the same as the large diameter section of the stepped through hole, the pipe hole of the horizontal pipe at the outlet end is a stepped hole, the upstream of the stepped hole is the small diameter end, and the diameter of the small diameter end is smaller than that of the sensor housing. The diameter of the small diameter section of the through hole is the same as the diameter of the large diameter end downstream of the stepped hole. Therefore, the high-speed vortex flow can be restored quickly and effectively, and the gas passing through the turbine flowmeter can be prevented from affecting other components. Both ends of the shaft of the impeller are respectively supported in the shaft holes on the spinner and the guide frame through a thrust bearing and a sliding bearing. Thrust bearing and sliding bearing are used to effectively reduce the wear between the shaft of the impeller, spinner and guide frame, and improve the service life of the turbine flowmeter.

Compared with the prior art, the turbine flowmeter for measuring tiny gas flow of the present invention has high measurement efficiency, high measurement accuracy, and less wear on components when measuring tiny gas flow, which greatly improves the performance of the turbine flowmeter. service life. The design is ingenious, the structure is simple, and it is easy to realize, which reduces the difficulty of installation, reduces the installation time, improves the assembly efficiency, and greatly reduces the cost.

Description of drawings

Fig. 1 is the structural representation of the turbine flowmeter for measuring tiny gas flow;

Fig. 2 is the axonometric view of the turbine flowmeter measuring minute gas flow;

Fig. 3 is the top view of the turbine flowmeter measuring tiny gas flow;

Fig. 4 is the side view of the turbine flowmeter measuring minute gas flow;

Fig. 5 is the structural representation of the spinner;

Figure 6 is a side view of the spinner;

Figure 7 is a side view of the guide frame;

FIG. 8 is a cross-sectional view taken along the line A-A in FIG. 7 .

Detailed ways

Referring to FIGS. 1 to 8 , it includes a turbine flowmeter for measuring tiny gas flow, including a sensor housing 4 , the upper end of the sensor housing 4 is connected to a converter 7 through an amplifier 6 , and the inlet end of the sensor housing 4 , the outlet end is provided with a horizontal pipe, the sensor housing 4 is provided with a stepped through hole, the inlet end and the outlet end of the stepped through hole are large diameter sections, the middle is a small diameter section, the small diameter section There is a variable diameter section between it and the inlet end; the variable diameter section of the stepped through hole of the sensor housing 4 gradually becomes smaller in diameter from the inlet end to the small diameter section, forming a conical hole, which is used for passing the gas. to accelerate. A spinner 9 is arranged in the inlet end, and a plurality of spinner blades 17 are arranged on the spinner 9 in a spiral shape around the axis. The number of spinner blades 17 of the spinner 9 is not less than 4, a flow channel is formed between two adjacent spinning blades, one end of the spinner 9 is provided with a fixing ring 16, the fixing ring 16 is fixedly connected with the spinning blade 17, and the spinner 9 is connected to the sensor shell through the fixing ring 16. The body 4 is fixedly connected, and the other end of the spinner 9 is provided with a shaft hole for installing the bearing. The number of the swirling blades 17 in this embodiment is four, thereby forming four helical flow channels, so that the passing gas forms a swirl flow. A guide frame 15 is arranged in the outlet end, and one end of the guide frame 15 is inserted into the small diameter section of the stepped through hole. The guide frame 15 includes a center column 20, and the center column 20 is provided with at least three The support piece 21 used for guiding, a positioning ring 19 is located at the downstream end of the guide frame 15 and is fixedly connected to the support piece 21 , the positioning ring 19 is located at the outlet end of the stepped through hole of the sensor housing 4 and is fixed to the sensor housing 4 . The number of the support pieces 21 in this embodiment is three, and the support pieces 21 are radially extending protrusions and extend axially along the central column 20 to form three guide channels. The positioning ring 19 of the guide frame 15 is fixed to the sensor housing 4 through a positioning pin 14 . The upstream end of the central column 20 is provided with a shaft hole for installing the bearing. The upstream end of the central column 20 of the guide frame 15 of the present embodiment is inserted into the small diameter section of the stepped through hole of the sensor housing 4 . An impeller 12 is located in the small diameter section, and the impeller 12 is fixed on an impeller shaft 11 . Both ends of the shaft of the impeller 12 are respectively supported in the shaft holes provided on the spinner 9 and the guide frame 15; In the shaft hole on the spinner 9 and the guide frame 15 . One end of the impeller shaft 11 in this embodiment is supported in the shaft hole of the spinner 9 through the thrust bearing 10 and the sliding bearing 13 , and the other end is supported on the shaft of the center column 20 of the guide frame 15 through the thrust bearing 10 and the sliding bearing 13 in the hole. The hole diameter of the horizontal pipe 2 at the inlet end is the same as the large diameter section of the stepped through hole. The pipe hole of the horizontal pipe 5 at the outlet end is a stepped hole. The upstream of the stepped hole is the small diameter end. The diameter of the small diameter end is smaller than that of the sensor housing. 4 is the diameter of the small diameter section of the stepped through hole, and the diameter of the large diameter end downstream of the stepped hole is the same as the diameter of the horizontal nozzle 2 at the inlet end. In this embodiment, a diameter reducing section whose diameter gradually increases is provided between the small diameter end and the large diameter end of the horizontal nozzle 5 at the outlet end. The upstream end of the horizontal pipe 2 at the inlet end is provided with a connecting flange 1, and the downstream end is fixedly connected with the sensor housing 4 through a ferrule 3; the upstream end of the horizontal pipe 5 at the outlet end is connected with the sensor housing through the ferrule 3 4. Fixed connection, the downstream end is provided with a connecting flange 1. Gaskets 8 are provided between the horizontal pipe 2 at the inlet end, the horizontal pipe 5 at the outlet end and the sensor housing 4 .

When the turbine flowmeter of the present invention for measuring the flow rate of tiny gas works, the tiny gas enters the sensor housing through the horizontal nozzle at the inlet end, and the tiny gas passes through the spinning blades of the spinner to form a vortex flow, and the vortex flow flows through the variable diameter in the sensor housing. The high-speed eddy current impacts the impeller to drive the impeller to rotate. The impeller is a magnetic-conducting impeller. The amplifier is equipped with a magnetic field coil and a magnetic induction device. Combined with the K value, the accurate flow rate of the micro-flow gas is calculated.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Those skilled in the art may make changes to the present invention without departing from the spirit of the present invention.

Claims (10)

1. The utility model provides a measure small gas flow's turbine flowmeter, includes sensor housing (4), converter (7) are connected through amplifier (6) in the upper end of sensor housing (4), entrance point, the exit end of sensor housing (4) all are equipped with horizontal takeover, its characterized in that: a stepped through hole is arranged in the sensor shell (4), the inlet end and the outlet end of the stepped through hole are both large-diameter sections, the middle of the stepped through hole is a small-diameter section, and a reducer section is arranged between the small-diameter section and the inlet end; a co-rotator (9) is arranged in the inlet end, a flow guide frame (15) is arranged in the outlet end, one end of the flow guide frame (15) is inserted into the small-diameter section of the stepped through hole, an impeller (12) is positioned in the small-diameter section, and two ends of a shaft of the impeller (12) are respectively supported in shaft holes arranged on the co-rotator (9) and the flow guide frame (15); the aperture of the inlet end horizontal connecting pipe (2) is the same as the large-diameter section of the stepped through hole, the pipe hole of the outlet end horizontal connecting pipe (5) is a stepped hole, the upstream of the stepped hole is a small-diameter end, the aperture of the small-diameter end is smaller than that of the small-diameter section of the stepped through hole of the sensor shell (4), and the aperture of the large-diameter end of the downstream of the stepped hole is the same as that of the inlet end horizontal connecting pipe (2).

2. The turbine flowmeter for measuring a minute gas flow rate according to claim 1, wherein: and two ends of the shaft of the impeller (12) are respectively supported in shaft holes of the screw-driver (9) and the flow guide frame (15) through a thrust bearing (10) and a sliding bearing (13).

3. The turbine flowmeter for measuring a minute gas flow rate according to claim 1, wherein: it is spiral helicine blade (17) to have been equipped with a plurality ofly around the axle center on spiral ware (9) to play, forms the runner between two adjacent blades that play to revolve, and the one end of playing spiral ware (9) is equipped with solid fixed ring (16), gu fixed ring (16) and play vane (17) fixed connection, play spiral ware (9) through solid fixed ring (16) and sensor housing (4) fixed connection, the other end setting of playing spiral ware (9) is used for installing the shaft hole of bearing.

4. A turbine flowmeter for measuring a minute gas flow rate according to claim 3, wherein: the number of the rotating blades (17) of the rotating starter (9) is not less than 4.

5. The turbine flowmeter for measuring a minute gas flow rate according to claim 1, wherein: the flow guide frame (15) comprises a center column (20), at least three supporting sheets (21) used for guiding are arranged on the circumference of the center column (20), a positioning ring (19) is located at the downstream end of the flow guide frame (15) and fixedly connected with the supporting sheets (21), the positioning ring (19) is located at the outlet end of a stepped through hole of the sensor shell (4) and fixed with the sensor shell (4), and a shaft hole used for installing a bearing is formed in the upstream end of the center column (20).

6. The turbine flowmeter for measuring a minute gas flow rate of claim 5, wherein: and a positioning ring (19) of the flow guide frame (15) is fixed with the sensor shell (4) through a positioning pin (14).

7. The turbine flowmeter for measuring a minute gas flow rate according to claim 1, wherein: the diameter-variable section of the stepped through hole of the sensor shell (4) is gradually reduced from the inlet end to the small-diameter section.

8. The turbine flowmeter for measuring a minute gas flow rate of claim 1, wherein: the impeller (12) is fixed on an impeller shaft (11).

9. The turbine flowmeter for measuring a minute gas flow rate according to claim 1, wherein: the upstream end of the inlet end horizontal connecting pipe (2) is provided with a connecting flange (1), and the downstream end of the inlet end horizontal connecting pipe is fixedly connected with the sensor shell (4) through a clamping sleeve nut (3); the upstream end of the outlet end horizontal connecting pipe (5) is fixedly connected with the sensor shell (4) through the clamping sleeve nut (3), and the downstream end of the outlet end horizontal connecting pipe is provided with a connecting flange (1).

10. The turbine flowmeter for measuring a minute gas flow rate according to claim 1, wherein: sealing gaskets (8) are arranged between the inlet end horizontal connecting pipe (2), the outlet end horizontal connecting pipe (5) and the sensor shell (4).

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