CN112082613A - Auxiliary starting system of elliptic gear flowmeter - Google Patents

Abstract

The invention relates to an auxiliary starting system of an elliptic gear flowmeter, which comprises a rotating speed measuring instrument, the elliptic gear flowmeter, a controller and an oil injection pump device, wherein the elliptic gear flowmeter comprises a driving wheel and a driven wheel, the rotating speed measuring instrument, the controller and the oil injection pump device are sequentially connected, the rotating speed measuring instrument is used for acquiring a real-time rotating speed value of the driving wheel and sending an instruction for adjusting the current of the oil injection pump device to the controller according to the real-time rotating speed value, the controller adjusts the current in the oil injection pump device according to the instruction for adjusting the current of the oil injection pump device so as to adjust the flow of lubricating oil sprayed out of the oil injection pump device, and the lubricating oil flows to each tooth groove of the driving wheel and the. The auxiliary starting system of the elliptic gear flowmeter ensures that enough thrust is provided to push the flowmeter rotor to work stably under the flow velocity action of the flowing working medium.

Description

A kind of oval gear flowmeter auxiliary starting system

technical field

The invention relates to the technical field of gear flowmeters, in particular to an oval gear flowmeter auxiliary starting system.

Background technique

Gear flowmeter is a kind of positive displacement flowmeter, which is used for precise continuous or discontinuous measurement of liquid flow or instantaneous flow in pipelines. It is especially suitable for flow measurement of heavy oil, polyvinyl alcohol, resin and other high-viscosity media.

As far as the current situation is concerned, most of the existing oval gear oval gear flowmeters have the problem of difficulty in resuming work and starting. When the oval gear oval gear flowmeter stops working for a period of time and starts again, it is usually due to impurities in the fuel. , bearing wear or other reasons, the contact surface of the gear cannot quickly form an oil film, resulting in a large frictional resistance, and it is difficult for the starting speed of the gear to reach the normal operating speed.

When the existing oval gear flowmeter is applied, it is difficult to achieve a normal working state, and there is a technical problem that only under the action of the flow rate of the flowing working medium is insufficient to promote the stable operation of the flowmeter rotor.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide an auxiliary starting system for an oval gear flowmeter to solve the technical problem that only the flow rate of the working medium is insufficient to promote the stable operation of the flowmeter rotor.

The invention provides an auxiliary starting system for an oval gear flowmeter, which includes a rotational speed measuring instrument, an oval gear flowmeter, a controller and a fuel injection pump device. The oval gear flowmeter includes a driving wheel and a driven wheel. The speed measuring instrument is used to obtain the real-time speed value of the driving gear, and sends an instruction to adjust the current of the fuel injection pump device to the controller according to the real-time speed value, and the controller according to the adjustment The current command of the fuel injection pump device adjusts the current in the fuel injection pump device, and then adjusts the flow rate of the lubricating oil injected from the fuel injection pump device, and the lubricating oil flows to each tooth slot of the driving gear and the driven gear.

Further, the rotational speed measuring instrument includes a single-chip microcomputer, a photoelectric sensor and a transparent protective case, the transparent protective case is tightly attached to the outside of the photoelectric sensor, and the photoelectric sensor is used to obtain the real-time rotational speed value of the driving gear, and to measure the real-time rotational speed of the driving gear. The rotational speed value is sent to the single-chip microcomputer, and the single-chip microcomputer sends the real-time rotational speed value to the controller, and the controller judges whether the real-time rotational speed value reaches the rotational speed of the flowmeter under the stable working condition, and if not, the controller makes the fuel injection pump device The flow rate of the injected lubricating oil increases, if so, the controller cuts off the current of the fuel injection pump device, so that the fuel injection pump device stops spraying the lubricating oil.

Further, the controller includes a rotational speed signal receiver, a rotational speed signal processor, a fuel injection pump device control module and an alarm device, and the rotational speed measuring instrument is also used to obtain the rotational direction information of the driving gear, and use the rotational direction information to Send it to the single-chip microcomputer, and the single-chip microcomputer sends the rotation direction information to the rotation speed signal receiver, and the rotation speed signal processor is used to judge whether the real-time rotation speed value exceeds the set threshold and whether the rotation direction is the opposite direction, if the real-time rotation speed value If the set threshold value is exceeded or the rotation direction is the opposite direction, the alarm device will alarm.

Further, the rotational speed signal receiver is also used to receive the real-time rotational speed value, the rotational speed signal processor is also used to judge whether the real-time rotational speed value reaches the rotational speed of the flowmeter in a stable working condition, and the fuel injection pump device control module is used to control the fuel injection pump device. The flow rate of the lubricating oil sprayed in.

Further, the oval gear flowmeter includes a display screen and a body part, the display screen is installed on the outside of the body part to display the accumulated flow value, and the body part includes a casing, a driving gear, a driven gear, A front cover and an O-shaped fixing ring part, the driving gear and the driven gear are arranged inside the casing, and the front cover cooperates with the O-shaped fixing ring part to seal the casing.

Further, the controller is installed on the outside of the body of the oval gear flowmeter, the rotational speed measuring instrument is embedded in the bottom of the body of the oval gear flowmeter, and the fuel injection pump device is installed on the body of the oval gear flowmeter. body bottom.

Further, two annular grooves are provided in the interior of the fuel injection pump device that is tightly fitted with the driving wheel and the driven wheel. The lubricating oil flows into the annular groove.

Further, the fuel injection pump device includes a solenoid valve, a fuel injection pump body and a fuel injection nozzle, the solenoid valve and the fuel injection pump body are connected as a whole, and the controller controls the magnitude of the energized current through the solenoid valve to control the fuel injection pump device to spray. The oil flow rate, the oil injection nozzle is used to spray out lubricating oil, and the annular groove is adapted to the size and shape of the oil injection nozzle.

Further, after the lubricating oil is sprayed through the oil injection nozzle, the lubricating oil flows to the two annular grooves. When the lubricating oil fills the annular grooves, the generated pressure pushes the driving wheel and the driven wheel to create a gap, and the lubricating oil will follow the grooves. As the gap overflows, it flows to each tooth slot of the driving gear and the driven gear, and an oil film is formed between the gear tooth surfaces.

Further, the rotational speed measuring instrument, the controller and the fuel injection pump device are sequentially connected by cables.

Compared with the prior art, the beneficial effects of the present invention include: acquiring the real-time rotational speed value of the driving gear through a rotational speed measuring instrument, and sending an instruction for adjusting the current of the fuel injection pump device to the controller according to the real-time rotational speed value, and the controller according to the real-time rotational speed value. The command to adjust the current of the fuel injection pump device adjusts the current in the fuel injection pump device, and then adjusts the flow rate of the lubricating oil injected from the fuel injection pump device, and the lubricating oil flows to each tooth slot of the driving gear and the driven gear; Under the action of the working medium flow rate, there is enough thrust to push the flowmeter rotor to work stably.

Description of drawings

1 is a schematic structural diagram of an oval gear flowmeter auxiliary starting system provided by an embodiment of the present invention;

2 is a schematic structural diagram of a rotational speed measuring instrument provided by an embodiment of the present invention;

3 is a schematic structural diagram of a controller provided by an embodiment of the present invention;

4 is a three-dimensional structural diagram of an oval gear flowmeter provided by an embodiment of the present invention;

5 is a schematic structural diagram of a fuel injection pump device provided by an embodiment of the present invention;

6 is a front view of the structure of an oval gear flowmeter auxiliary starting system provided by an embodiment of the present invention;

FIG. 7 is a top view of the structure of an oval gear flowmeter auxiliary starting system according to an embodiment of the present invention.

Reference numerals: 1 - oval gear flowmeter; 11 - LCD display screen; 12 - front cover; 13 - O-ring fixing ring part; 14 - driven gear; 15 driving gear; 16 - housing; 161 - annular groove ;162-oil passage;2-fuel injection pump device;21-solenoid valve;22-fuel injection pump body;23-nut;24-fuel injection nozzle;3-non-contact speed measuring instrument;31-MCU;32-transparent Protective shell; 33-photoelectric sensor; 4-controller; 41-display screen; 42-speed signal receiver; 43-speed signal processor; 44-fuel injection pump device control module; 45-alarm device;

Detailed ways

The preferred embodiments of the present invention are specifically described below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present application, and together with the embodiments of the present invention, are used to explain the principles of the present invention, but are not used to limit the scope of the present invention.

An embodiment of the present invention provides an oval gear flowmeter auxiliary starting system, including a rotational speed measuring instrument, an oval gear flowmeter, a controller and a fuel injection pump device, the oval gear flowmeter includes a driving wheel and a driven wheel, and the rotational speed measurement The instrument, the controller and the fuel injection pump device are connected in sequence. The rotational speed measuring instrument is used to obtain the real-time rotational speed value of the driving gear, and sends an instruction to adjust the current of the fuel injection pump device to the controller according to the real-time rotational speed value. The command to adjust the current of the fuel injection pump device adjusts the current in the fuel injection pump device, and then adjusts the flow rate of the lubricating oil injected from the fuel injection pump device, and the lubricating oil flows to each tooth slot of the driving gear and the driven gear.

The above-mentioned technical solution enables sufficient thrust to push the flowmeter rotor to work stably under the action of the flow rate of the flowing working medium.

In a specific embodiment, a schematic structural diagram of an oval gear flowmeter auxiliary starting system, as shown in FIG. 1 , the oval gear flowmeter auxiliary starting system includes an oval gear flowmeter 1, a fuel injection pump device 2 controlled by a solenoid valve, no Contact tachometer 3 and controller 4;

Preferably, the rotational speed measuring instrument comprises a single-chip microcomputer, a photoelectric sensor and a transparent protective case, the transparent protective case is tightly attached to the outside of the photoelectric sensor, and the photoelectric sensor is used to obtain the real-time rotational speed value of the driving gear, and to measure the real-time rotational speed of the driving gear. The rotational speed value is sent to the single-chip microcomputer, and the single-chip microcomputer sends the real-time rotational speed value to the controller, and the controller judges whether the real-time rotational speed value reaches the rotational speed of the flowmeter under the stable working condition, and if not, the controller makes the fuel injection pump device The flow rate of the injected lubricating oil increases, if so, the controller cuts off the current of the fuel injection pump device, so that the fuel injection pump device stops spraying the lubricating oil;

In a specific embodiment, a schematic diagram of the structure of the rotational speed measuring instrument, as shown in FIG. 2 , the rotational speed measuring instrument is a non-contact rotational speed measuring instrument 3, which includes a photoelectric sensor 33; a transparent protective shell 32 is closely attached to the photoelectric sensor 33. External; the single chip microcomputer 31 is fixed on the bottom of the body shell 16 of the oval gear flowmeter;

Preferably, the controller includes a rotational speed signal receiver, a rotational speed signal processor, a fuel injection pump device control module and an alarm device, and the rotational speed measuring instrument is also used to obtain the rotational direction information of the driving gear, and use the rotational direction information to Send it to the single-chip microcomputer, and the single-chip microcomputer sends the rotation direction information to the rotation speed signal receiver, and the rotation speed signal processor is used to judge whether the real-time rotation speed value exceeds the set threshold and whether the rotation direction is the opposite direction, if the real-time rotation speed value If the set threshold is exceeded or the rotation direction is the opposite direction, the alarm device will alarm;

In a specific embodiment, the schematic structural diagram of the controller, as shown in FIG. 3 , the controller 4 includes a display screen 41, an alarm device 45, a speed signal receiver 42, a speed signal processor 43 and a fuel injection pump device control module 44. , the display screen 41 is placed outside the casing of the controller 4;

Preferably, the rotational speed signal receiver is further used for receiving a real-time rotational speed value, the rotational speed signal processor is further used for judging whether the real-time rotational speed value reaches the rotational speed in a stable working condition of the flowmeter, and the fuel injection pump device control module is used for controlling the fuel injection pump device The flow rate of the lubricating oil sprayed in;

Preferably, the oval gear flowmeter includes a display screen and a body part, the display screen is installed on the outside of the body part to display the accumulated flow value, and the body part includes a casing, a driving gear, a driven gear, a front cover and an O-shaped fixing ring part, the driving gear and the driven gear are arranged inside the casing, and the front cover cooperates with the O-shaped fixing ring part to seal the casing;

In a specific embodiment, the three-dimensional structure diagram of the oval gear flowmeter, as shown in FIG. 4 , the oval gear flowmeter 1 includes an LCD display screen 11 , a housing 16 , a driving gear 15 , a driven gear 14 , and a front cover 12 . , a gasket, an O-shaped fixing ring part 13, a power supply connection cable; the power supply connection cable is connected to an external power supply;

The driving gear 15 and the driven gear 14 are placed inside the oval gear flowmeter; the annular groove 161 is arranged on the side of the driving gear 15 and the driven gear 14 close to the bottom of the oval gear flowmeter housing 16 equipped with the fuel injection pump device 2 ;

Preferably, the controller is installed on the outside of the body of the oval gear flowmeter, the rotational speed measuring instrument is embedded in the bottom of the body of the oval gear flowmeter, and the fuel injection pump device is installed on the body of the oval gear flowmeter. body bottom.

Preferably, two annular grooves are provided in the interior of the fuel injection pump device, which are tightly attached to the driving wheel and the driven wheel, and the annular grooves have the same circle center as the driving gear and the driven gear, and are sprayed from the fuel injection pump device. The lubricating oil flows into the annular groove.

Preferably, the fuel injection pump device includes a solenoid valve, a fuel injection pump body and a fuel injection nozzle, the solenoid valve and the fuel injection pump body are connected as a whole, and the controller controls the magnitude of the energized current passing through the solenoid valve to control the injection of the fuel injection pump device. The flow rate of oil, the oil injection nozzle is used to spray lubricating oil, and the annular groove is adapted to the size and shape of the oil injection nozzle;

In a specific embodiment, the fuel injection pump device is a fuel injection pump device controlled by a solenoid valve, and a schematic structural diagram of the fuel injection pump device, as shown in FIG. 5 , the fuel injection pump device 2 controlled by a solenoid valve includes a fuel injection pump body. 22. Solenoid valve 21, nut 23 and fuel injection nozzle 24, solenoid valve 21 is connected with fuel injection pump body 22; nut 23 fixes the fuel injection pump device with solenoid valve on the bottom of oval gear flowmeter body shell 16; The oil nozzle 24 is embedded in the annular groove at the bottom of the body casing 16 of the oval gear flowmeter whose shape and size are adapted to it;

The annular groove completely accommodates the fuel injection nozzle, so that the fuel injection pump device can spray lubricating oil to the annular groove of the driving gear and the driven gear through the oil passage, thereby lubricating the gears; the fuel injection pump device with the solenoid valve does not Occupying the fixed volume space formed by the main and driven gears and the cavity does not affect the measurement accuracy of the oval gear flowmeter.

Preferably, after the lubricating oil is sprayed out through the fuel injection nozzle, the lubricating oil flows to the two annular grooves. When the lubricating oil fills the annular grooves, the generated pressure pushes the driving wheel and the driven wheel to create a gap, and the lubricating oil will follow the As the gap overflows and flows to each tooth slot of the driving gear and the driven gear, an oil film is formed between the gear tooth surfaces; in order to reduce the frictional force and make it achieve a stable working speed;

In a specific embodiment, the front view and top view of the oval gear flowmeter auxiliary starting system structure are shown in Figures 6 and 7 respectively. The fuel injection pump device control module also includes a speed comparator, a power-on control switch, and a sliding rheostat element; When the gear flowmeter is initially started, the controller 4 starts the fuel injection pump device 2 with a solenoid valve, and is set on the side where the fuel injection pump device 2 is installed through the oil passage 162. The oval gear flowmeter housing 16 is connected to the main and driven wheels. The tightly fitted inner annular groove 161 is sprayed with lubricating oil. When the lubricating oil is filled with the annular groove 161, since the gear is closely fitted with the inside of the casing 16 on the side where the annular groove 161 is provided, the lubricating oil is filled with oil. The annular groove 161 will generate a certain pressure to push the gear to create a certain gap, and the lubricating oil will flow to each tooth slot of the driving gear 15 and the driven gear 14 with the overflow of the gap, so as to quickly form a liquid film between the contact surfaces of the two gears, Reduce the friction of the contact surface;

The rotational speed of the gear is monitored by the photoelectric sensor 33 of the non-contact rotational speed measuring instrument 3. When the rotational speed of the gear reaches the rotational speed of the flowmeter in a stable working condition, the current of the fuel injection pump device 2 with a solenoid valve is cut off by the controller 4, and the flow rate of the working medium is impacted by the The force acting alone pushes the gear to rotate;

When the photoelectric sensor 33 detects that the rotational speed of the gear cannot reach the rotational speed of the flowmeter in the stable working condition, the single-chip microcomputer 31 in the non-contact rotational speed measuring instrument 3 will transmit the processed data signal to the rotational speed signal receiver in the controller through the cable 34 42; the single-chip microcomputer 31 converts the gear rotational speed signal measured by the photoelectric sensor 33 into a digital signal;

The rotational speed signal processing device 43 in the controller 4 judges that the rotational speed signal has not reached the operating speed, and then adjusts the position of the sliding varistor sliding piece through the fuel injection pump device control module 44 in the controller 4 to reduce the circuit resistance and thereby increase the belt resistance. The energizing current of the solenoid valve 21 in the fuel injection pump device 2 of the solenoid valve makes the fuel injection pump device 2 increase the fuel injection amount, so that the lubricating oil and the gear surface are more fully contacted, until the gear speed reaches the flowmeter's stable working condition speed. The energizing current of the fuel injection pump device 2 with the solenoid valve is cut off by the controller 4, the fuel injection pump device stops working, and the rotor is only driven by the flowing working medium to work stably;

At the same time, the alarm device 45 in the controller 4 can monitor whether the gear is reversed (abnormal) and the rotation speed is too large. When the above situation occurs, the warning light of the alarm device 45 will flash and sound an alarm.

Preferably, the rotational speed measuring instrument, the controller and the fuel injection pump device are sequentially connected by cables.

The oval gear flowmeter auxiliary starting system of the present invention obtains the real-time rotational speed value of the driving gear through the rotational speed measuring instrument, and sends an instruction to adjust the current of the fuel injection pump device to the controller according to the real-time rotational speed value. The command to adjust the current of the fuel injection pump device adjusts the current in the fuel injection pump device, and then adjusts the flow rate of the lubricating oil injected from the fuel injection pump device, and the lubricating oil flows to each tooth slot of the driving gear and the driven gear; Under the action of the flow rate, there is enough thrust to drive the rotor of the flowmeter to work stably; it provides a guarantee for the rapid and stable start of the oval gear flowmeter, and has strong feasibility and practicability.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention.

Claims (10)

1. The auxiliary starting system of the elliptic gear flowmeter is characterized by comprising a rotating speed measuring instrument, the elliptic gear flowmeter, a controller and an oil injection pump device, wherein the elliptic gear flowmeter comprises a driving wheel and a driven wheel, the rotating speed measuring instrument, the controller and the oil injection pump device are sequentially connected, the rotating speed measuring instrument is used for obtaining a real-time rotating speed value of the driving wheel and sending an instruction for adjusting the current of the oil injection pump device to the controller according to the real-time rotating speed value, the controller adjusts the current in the oil injection pump device according to the instruction for adjusting the current of the oil injection pump device so as to adjust the flow of lubricating oil ejected from the oil injection pump device, and the lubricating oil flows to each tooth groove of the driving wheel and the driven wheel.

2. The elliptical gear flowmeter starting aid system according to claim 1, wherein the rotation speed measuring instrument includes a single chip microcomputer, a photoelectric sensor, and a transparent protective case, the transparent protective case is attached to an exterior of the photoelectric sensor, the photoelectric sensor is configured to obtain a real-time rotation speed value of the driving gear and send the real-time rotation speed value of the driving gear to the single chip microcomputer, the single chip microcomputer sends the real-time rotation speed value to the controller, the controller determines whether the real-time rotation speed value reaches a stable operating condition rotation speed of the flowmeter, if not, the controller increases a flow rate of lubricating oil ejected from the injection pump device, and if so, the controller cuts off a current of the injection pump device to stop the injection pump device from ejecting the lubricating oil.

3. The elliptical gear flowmeter auxiliary starting system according to claim 2, wherein the controller comprises a rotation speed signal receiver, a rotation speed signal processor, a fuel injection pump device control module and an alarm device, the rotation speed measuring instrument is further configured to obtain rotation direction information of the driving gear and send the rotation direction information to the single chip microcomputer, the single chip microcomputer sends the rotation direction information to the rotation speed signal receiver, the rotation speed signal processor is configured to determine whether the real-time rotation speed value exceeds a set threshold value and whether the rotation direction is the reverse direction, and if the real-time rotation speed value exceeds the set threshold value or the rotation direction is the reverse direction, the alarm device is made to alarm.

4. The elliptical gear flow meter assisted start system of claim 2, wherein the rotational speed signal receiver is further configured to receive a real-time rotational speed value, the rotational speed signal processor is further configured to determine whether the real-time rotational speed value reaches a steady-state rotational speed of the flow meter, and the injection pump assembly control module is configured to control a flow rate of lubricant injected into the injection pump assembly.

5. The elliptical gear flow meter start assist system of claim 1, wherein the elliptical gear flow meter includes a display screen and a body portion, the display screen is mounted outside the body portion for displaying an accumulated flow value, the body portion includes a housing, a drive gear, a driven gear, a front cover and an O-ring retainer member, the drive gear and the driven gear are disposed inside the housing, and the front cover cooperates with the O-ring retainer member to seal the housing.

6. The elliptical gear flow meter start assist system of claim 1, wherein the controller is mounted outside of the elliptical gear flow meter body, the tachometer is embedded in a bottom portion of the elliptical gear flow meter body housing, and the fuel injection pump assembly is mounted to the bottom portion of the elliptical gear flow meter body housing.

7. The elliptical gear flow meter assisted starting system according to claim 1, wherein two annular grooves are formed in the interior of the fuel injection pump device, which is in close contact with the driving gear and the driven gear, the annular grooves having the same center as the driving gear and the driven gear, and the lubricating oil injected from the fuel injection pump device flows into the annular grooves.

8. The elliptical gear flowmeter start-assisting system of claim 7, wherein the fuel injection pump device comprises a solenoid valve, a fuel injection pump body, and a fuel injection nozzle, the solenoid valve is integrally connected to the fuel injection pump body, the magnitude of the current applied through the solenoid valve is controlled by a controller to control the flow rate of fuel injected by the fuel injection pump device, the fuel injection nozzle is used for injecting lubricating oil, and the annular groove is adapted to the size and shape of the fuel injection nozzle.

9. The elliptical gear flow meter assisted starting system according to claim 8, wherein when the lubricating oil is injected through the oil injection nozzle, the lubricating oil flows to the two annular grooves, when the annular grooves are filled with the lubricating oil, the generated pressure pushes the driving wheel and the driven wheel to generate gaps, and the lubricating oil flows to each tooth groove of the driving wheel and the driven wheel along with the gaps, so that an oil film is formed between the tooth surfaces of the gears.

10. The elliptical gear flow meter assisted start-up system of claim 1, wherein the speed measurement device, the controller and the fuel injection pump device are connected in sequence by cables.

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