CN210108449U - Servo type waist wheel flowmeter - Google Patents

Servo type waist wheel flowmeter Download PDF

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Publication number
CN210108449U
CN210108449U CN201921249342.1U CN201921249342U CN210108449U CN 210108449 U CN210108449 U CN 210108449U CN 201921249342 U CN201921249342 U CN 201921249342U CN 210108449 U CN210108449 U CN 210108449U
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China
Prior art keywords
servo
flowmeter
roots
waist wheel
servo motor
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Active
Application number
CN201921249342.1U
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Chinese (zh)
Inventor
卢强
年亚东
张�浩
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Hefei Jingjie Instrument Co Ltd
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Hefei Jingjie Instrument Co Ltd
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Priority to CN201921249342.1U priority Critical patent/CN210108449U/en
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Abstract

The utility model relates to a servo-type roots flowmeter, including the flowmeter body, this internal first roots and the second roots that is located fluid entrance and exit and carries out intermeshing transmission that is equipped with of flowmeter, first roots and second roots correspond to be connected on arranging shells inner wall's rotor in, second roots one end is connected with servo motor through drive gear, flowmeter body fluid entrance installs the little differential pressure transmitter of monitoring fluid pressure difference change through the connecting tube that is connected with fluid outlet, little differential pressure transmitter one end is connected with servo amplifier through differential transformer electricity, last both ends difference mutual inductance respectively of little differential pressure transmitter is connected with primary coil and secondary coil in the differential transformer, servo amplifier output electricity is connected with servo motor, servo motor output one end is connected with servo amplifier through feedback tachogenerator. Has the advantages that: the utility model discloses can realize the high accuracy measurement of low discharge, the safety and stability, the practicality is strong.

Description

Servo type waist wheel flowmeter
Technical Field
The utility model relates to a flowmeter technical field, concretely relates to servo-type roots flowmeter.
Background
The volumetric flowmeter is a direct measurement type flowmeter which uses a mechanical measuring element to continuously divide a fluid into single fixed volume parts for discharge, and then measures and calculates the flow rate by counting the number of the fixed volume parts of the fluid discharged through the meter per unit time or within a certain time interval, and can be used for volumetric flow measurement of various liquids and gases.
The conventional positive displacement flowmeter has certain gaps between a rotor (elliptic gear, a waist wheel or a scraper, etc.) and a shell and between the rotor and the rotor, and fluid leakage can be generated due to the pressure difference between an inlet and an outlet of the flowmeter, so that measurement errors are caused, and particularly, the measurement errors are large when small-flow and low-viscosity fluids are measured. To solve this problem, servo-type volumetric flowmeters have been developed. The volumetric flowmeter adopting the servo mechanism eliminates leakage and improves the measurement accuracy of small-flow and low-viscosity fluid by keeping the differential pressure of the inlet and the outlet of the flowmeter close to zero. The servo type volumetric flowmeter is one of the better meters for solving the problem of tiny flow measurement at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a servo-type roots flowmeter provides a good, can measure the servo-type roots flowmeter of small flow of result of use.
In order to realize the above purpose, the utility model discloses a technical scheme be: a servo type waist wheel flowmeter comprises a flowmeter body, wherein a first waist wheel and a second waist wheel which are positioned at a fluid inlet and a fluid outlet and are in meshed transmission are arranged in the flowmeter body, the first waist wheel and the second waist wheel are correspondingly connected to a rotor arranged on the inner wall of a shell, one end of the second waist wheel is connected with a servo motor through a transmission gear, a micro differential pressure transmitter for monitoring the pressure difference change of fluid is arranged at the fluid inlet of the flowmeter body through a pressure guide pipe connected with the fluid outlet, one end of the micro differential pressure transmitter is electrically connected with a servo amplifier through a differential transformer, primary coils and secondary coils in the differential transformer are respectively connected with the two ends of the micro differential pressure transmitter in a mutual inductance mode, the output end of the servo amplifier is electrically connected with a servo motor, one output end of the servo motor is connected with the servo amplifier through a feedback tacho, one end of the transmission gear is far away from one side of the servo motor, a tachogenerator is installed on one side of the transmission gear, and the tachogenerator is connected with a display recorder arranged outside the shell through a lead.
Furthermore, the first waist wheel and the second waist wheel are respectively and correspondingly provided with a rotating shaft at the central position.
Further, the first and second pulleys and the rotor and the housing inner wall each form a metering chamber.
Further, the servo motor, the feedback tachogenerator and the tachogenerator are mechanically fastened to the inner wall of the shell.
Furthermore, the aperture size of the pressure guide pipe is smaller than the peripheral size of an inlet and outlet pipeline of the fluid for the flowmeter body.
The technical effects of the utility model reside in that: when the flowmeter works, the waist wheel is driven by the servo motor through the transmission gear, and the rotation speed of the servo motor is changed along with the pressure difference between the fluid inlet and the fluid outlet. The pressure pipe leads the inlet and outlet pressure to the differential pressure transmitter to measure the change of the inlet and outlet pressure difference, when the inlet and outlet pressure difference is larger than zero, the output signal of the differential pressure transmitter is amplified to drive the servo motor to drive the waist wheel to accelerate rotation, so that the flowmeter discharges fluid with larger flow, and the pressure difference approaches to zero. The servo type waist wheel flowmeter is close to a zero differential pressure flowmeter, the leakage amount is reduced to the minimum, so that the high-precision measurement of small flow can be realized, the measurement error is hardly influenced by the pressure, the viscosity and the density of fluid, the service performance is greatly improved, the influence caused by differential pressure can be reduced, and the measurement precision is high.
Drawings
Fig. 1 is a schematic structural diagram of the servo-type waist wheel flowmeter of the present invention.
Reference numerals: 1-a flow meter body; 2-a first waist wheel; 3-a second waist wheel; 4-a rotor; 5-a transmission gear; 6-a servo motor; 7-a pressure guide pipe; 8-micro differential pressure transmitter; 9-a differential transformer; 10-a servo amplifier; 11-a primary coil; 12-a secondary coil; 13-feedback tachogenerator; 14-a tachogenerator; 15-display recorder; 16-rotating shaft.
Detailed Description
Referring to the attached figure 1, a servo type waist wheel flowmeter comprises a flowmeter body 1, wherein a first waist wheel 2 and a second waist wheel 3 which are positioned at a fluid inlet and a fluid outlet and are in meshed transmission with each other are arranged in the flowmeter body 1, the first waist wheel 2 and the second waist wheel 3 are correspondingly connected to a rotor 4 arranged on the inner wall of a shell, one end of the second waist wheel 2 is connected with a servo motor 6 through a transmission gear 5, a micro differential pressure transmitter 8 for monitoring fluid pressure difference is arranged at the fluid inlet of the flowmeter body 1 through a pressure guide pipe 7 connected with the fluid outlet, one end of the micro differential pressure transmitter 8 is electrically connected with a servo amplifier 10 through a differential transformer 9, two ends of the micro differential pressure transmitter 8 are respectively in mutual inductance connection with a primary coil 11 and a secondary coil 12 in the differential transformer 9, and the output end of the servo amplifier 10 is electrically connected with the servo motor 6, the output end of the servo motor 6 is connected with the servo amplifier 10 through a feedback tachogenerator 13, one end of the transmission gear 5 is far away from one side of the servo motor 6 and is provided with a tachogenerator 14, and the tachogenerator 14 is connected with a display recorder 15 arranged outside the shell through a lead.
Preferably, when the fluid enters the flowmeter body 1, because the gap between the transmission parts can cause the pressure difference to further affect the measurement precision, the pressure pipe 7 is arranged at the fluid inlet, the pressure change is monitored by the micro differential pressure transmitter 8, then the signal is transmitted by the mutual inductance phenomenon of the differential transformer 9 and amplified by the servo amplifier 10, the servo motor 6 drives the transmission gear 5 to rotate, so as to compensate the rotation of the waist wheel, finally the flow is accurately measured by the display recorder 15 connected with the tachogenerator 14, when the mutual inductance of the micro differential pressure transmitter changes along with the change of the pressure difference, the output voltage is correspondingly changed by matching the primary coil 11 and the secondary coil 12, and the feedback tachogenerator 13 can timely react the output signal of the servo motor 6 to the servo amplifier 10, thereby ensuring constant speed control of the servo motor 6.
Preferably, the first and second pulleys 2 and 3 are respectively and correspondingly provided with a rotating shaft 16 at a central position, the first and second pulleys 2 and 3, the rotor and the inner wall of the housing respectively form a metering chamber, and the respective metering chambers of the first and second pulleys 2 and 3 can effectively ensure that the metering space is filled with liquid, so that the later metering operation is facilitated.
Preferably, servo motor 6, feedback tachogenerator 13 and tachogenerator 14 all install extremely with the mode of mechanical fastening on the shells inner wall, the timely installation dismantlement of part can be guaranteed to the connected mode of mechanical fastening when mechanical failure appears in the motor, and the practicality is strong.
Preferably, the aperture size of the pressure guide pipe 7 is smaller than the peripheral size of the inlet and outlet pipeline of the flowmeter body 1 for fluid, and the peripheral size of the pipeline is larger than the aperture of the pressure guide pipe 7, so that the hydraulic pressure difference of the inflow port can be effectively measured, and the differential pressure transmitter 8 can monitor the pressure difference change.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. A servo type waist wheel flowmeter comprises a flowmeter body (1) and is characterized in that a first waist wheel (2) and a second waist wheel (3) which are positioned at a fluid inlet and a fluid outlet and are in meshed transmission with each other are arranged in the flowmeter body (1), the first waist wheel (2) and the second waist wheel (3) are correspondingly connected to a rotor (4) arranged on the inner wall of a shell, one end of the second waist wheel (3) is connected with a servo motor (6) through a transmission gear (5), a micro differential pressure transmitter (8) for monitoring the change of fluid pressure difference is arranged at the fluid inlet of the flowmeter body (1) through a pressure guide pipe (7) connected with the fluid outlet, one end of the micro differential pressure transmitter (8) is electrically connected with a servo amplifier (10) through a differential transformer (9), and two ends of the micro differential pressure transmitter (8) are respectively connected with a primary coil (11) and a secondary coil (12) in the differential transformer (9) through mutual inductance, the output end of the servo amplifier (10) is electrically connected with the servo motor (6), one output end of the servo motor (6) is connected with the servo amplifier (10) through a feedback tachogenerator (13), one end of the transmission gear (5) is far away from the tachogenerator (14) installed on one side of the servo motor (6), and the tachogenerator (14) is connected with a wire and arranged in the display recorder (15) outside the shell.
2. A servo-type waist wheel flow meter according to claim 1, wherein a central shaft (16) is mounted on each of the first and second waist wheels (2, 3).
3. A servo-type roots meter according to claim 2, wherein the first (2) and second (3) roots and the rotor and housing inner walls each form a metering chamber.
4. A servo-type roots meter according to claim 1, characterized in that the servo motor (6), the feedback tachogenerator (13) and the tachogenerator (14) are mounted mechanically fastened to the inner wall of the housing.
5. A servo-type roots meter according to claim 1, characterized in that the bore size of the impulse pipe (7) is smaller than the peripheral dimension of the inlet and outlet pipe of the meter body (1) for the fluid.
CN201921249342.1U 2019-08-05 2019-08-05 Servo type waist wheel flowmeter Active CN210108449U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921249342.1U CN210108449U (en) 2019-08-05 2019-08-05 Servo type waist wheel flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921249342.1U CN210108449U (en) 2019-08-05 2019-08-05 Servo type waist wheel flowmeter

Publications (1)

Publication Number Publication Date
CN210108449U true CN210108449U (en) 2020-02-21

Family

ID=69567561

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921249342.1U Active CN210108449U (en) 2019-08-05 2019-08-05 Servo type waist wheel flowmeter

Country Status (1)

Country Link
CN (1) CN210108449U (en)

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