CN210319416U

CN210319416U - Filling device with small flow measurement

Info

Publication number: CN210319416U
Application number: CN201921222992.7U
Authority: CN
Inventors: 楚站峰; 策红军; 刘军伟; 林茂; 赵辉; 方洪涛
Original assignee: Luoyang Lvchao Environmental Protection Technology Co ltd
Current assignee: Luoyang Lvchao Environmental Protection Technology Co ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-04-14
Anticipated expiration: 2029-07-31

Abstract

A small-flow-rate filling device comprises a dosing tank, a liquid level meter, a blow-down valve, a Y-shaped filter, a conventional metering pump, a safety valve, a buffer with a pressure gauge, a bypass ball valve, an isolation ball valve, a flow meter, a small-flow-rate adjusting valve, a check valve, a throttle valve and a control cabinet, wherein the conventional metering pump can realize the control accuracy of the flow rate of the conventional metering pump below 10 percent under the connection and control of the flow meter, the small-flow-rate adjusting valve, the buffer with the pressure gauge, the control cabinet and other accessories, the accumulated error is reduced, the accurate metering can be achieved, the control device has the characteristics of reliable structure, high efficiency and low cost, the filling accuracy of fluid materials at the flow rate of below 10 percent is ensured, and the re-investment is saved.

Description

Filling device with small flow measurement

Technical Field

The utility model belongs to the technical field of the measuring equipment control, in particular to filling device of little flow meter volume.

Background

The flow of the metering pump can be stepless regulated within the range of 0-100%, according to the structural characteristics of the metering pump, the metering precision can reach +/-1% when the flow is regulated within the range of 10-100%, and if the flow is below 10%, the flow control precision is low, the accumulated error is large, and the accurate metering cannot be achieved.

In both cases it may occur that the metering pump flow may operate in the range below 10%.

The first is that the filling amount is reduced due to the change of the production process, and the filling pump must work below 10 percent;

the second is that under the condition of over-small flow, for example, the flow is less than 0.5L/h, the manufacturers for producing the small metering pump are few, the manufacturing difficulty is high, the construction period is long, and the manufacturing cost is too high, so that the conventional metering pump can replace the small metering pump and be used for the flow control of less than 10 percent.

Disclosure of Invention

For solving the problem that above-mentioned second condition exists, the utility model discloses a filling device of little flow measurement, this filling device can realize the high accuracy measurement filling of flow below 10% through conventional measuring pump, has efficient, with low costs, has guaranteed the filling precision, has saved the reinvestment.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a filling device of little flow measurement, includes that medicine adding jar, level gauge, blowoff valve, Y shape filter, conventional measuring pump, relief valve, take pressure gauge buffer, bypass ball valve, isolation ball valve, flowmeter, little flow control valve, check valve, choke valve and switch board, wherein dispose PLC system and other electrical control device in the switch board, characterized by:

one side of the dosing tank is connected with a liquid level meter through an upper valve and a lower valve at two ends, and the bottom of the dosing tank is connected with a drain valve;

the inlet end of the Y-shaped filter is connected to the bottom of the dosing tank through a valve, the outlet end of the Y-shaped filter is respectively connected with a conventional metering pump and a safety valve in parallel through a pipeline, the outlet end of the safety valve is respectively connected with a pressure gauge buffer and a throttle valve in series through a pipeline, the outlet end of the conventional metering pump is connected with a check valve after being connected with a pipeline between the pressure gauge buffer and the throttle valve through a pipeline, the check valve is connected with a small flow regulating valve through a pipeline, the small flow regulating valve is connected with an isolation ball valve, a flowmeter and an isolation ball valve in series through a pipeline, a bypass ball valve is connected on a bypass between the upper isolation ball valve and the lower isolation ball valve in parallel, the electric control end of the conventional metering pump, the electric control end of the small flow regulating valve and the electric control end of the flowmeter are all, and then sends out an adjusting signal to the small flow regulating valve.

The flowmeter adopts a turbine flowmeter.

The small flow regulating valve adopts a manual stroke regulating mode or an electric stroke regulating mode, needs to be marked with scale indication, and needs to be provided with a valve positioner at the valve position.

The conventional metering pump adopts a hydraulic double-diaphragm metering pump, the metering accuracy of the hydraulic double-diaphragm metering pump is required to be higher than +/-1% in a flow range of 10-100%, and the pressure or the flow at the outlet end of the hydraulic double-diaphragm metering pump is required to be in a negative deviation-free state.

The liquid level meter is either an on-site liquid level meter or a remote liquid level meter; the on-site liquid level meter adopts a magnetic turning plate liquid level meter or a glass plate liquid level meter; the remote transmission liquid level meter adopts a double-flange liquid level transmitter.

Owing to adopt as above technical scheme, the utility model discloses produce following positive effect:

1. the utility model discloses a filling device has changed the problem that conventional measuring pump exists below its flow 10%, makes the high accuracy measurement of conventional measuring pump flow realize below 10% and annotates through filling device, and filling device has the characteristics of reliable, efficient, with low costs of structure, has guaranteed the filling precision of fluid material when flow below 10% has saved the reinsurance.

2. The utility model provides a behind the flow signal of flowmeter, the PLC system design data in will earlier received signal and the switch board compares and carry out logical operation, just can export control signal and give low discharge control valve, and the switch board still has the function of controlling other consumer, opens for example opening of measuring pump and stops function etc..

Drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

In fig. 1: 1-a dosing tank, 2-a liquid level meter, 3-a blowdown valve, 4-a Y-shaped filter, 5-a conventional metering pump, 6-a safety valve, 7-a buffer with a pressure meter, 8-a bypass ball valve, 9-an isolation ball valve, 10-a flow meter, 11-a small flow regulating valve, 12-a check valve, 13-a throttle valve and 14-a control cabinet.

Detailed Description

The utility model relates to a filling device of little flow measurement, little flow is that the flow that conventional metering pump transported the fluid material in the medicine feeding tank is below 10%. Its measurement accuracy can reach 1% when conventional measuring pump is adjusted in 10 ~ 100% flow range, then can appear flow control accuracy low, accumulative error big when the flow is below 10%, can't reach the problem of accurate measurement, the utility model discloses a problem that filling device will solve is that, the control accuracy of its below 10% flow can be realized through what kind of configuration to conventional measuring pump, reduce accumulative error and can reach the accurate measurement.

Referring to fig. 1, the filling device includes a dosing tank (1), a liquid level meter (2), a blowoff valve (3), a Y-shaped filter (4), a conventional metering pump (5), a safety valve (6), a buffer with a pressure gauge (7), a bypass ball valve (8), an isolation ball valve (9), a flow meter (10), a small flow regulating valve (11), a check valve (12), a throttle valve (13) and a control cabinet (14), wherein a PLC system and other electrical control devices are configured in the control cabinet, the control cabinet also has a function of controlling storage or modification of design data of other electrical equipment, such as a start-stop function of the metering pump.

The liquid level meter (2) is either an on-site liquid level meter or a remote liquid level meter; the on-site liquid level meter adopts a magnetic turning plate liquid level meter or a glass plate liquid level meter, and the remote transmission liquid level meter adopts a double-flange liquid level transmitter.

The flow meter adopts a turbine flow meter.

The small flow regulating valve adopts a manual stroke regulating mode or an electric stroke regulating mode, the small flow regulating valve is required to be marked with scale indication, a valve positioner is required to be arranged at the valve of the small flow regulating valve, the valve positioner can change 4-20 mA electric pulse signals output by the control cabinet into air/electric signals for driving the small flow regulating valve to act, so that the small flow regulating valve has corresponding valve opening, and the precision requirement of the valve opening of the small flow regulating valve reaches +/-1%.

The structural connection mode of the related filling device refers to the technical scheme and is not described in detail. But need to be explained as follows:

1. the flowmeter is used for detecting the output instantaneous flow and transmitting the flow to the control cabinet by an electric pulse signal of 4-20 mA.

2. The turbine flowmeter converts the flow speed of the fluid material passing through the small flow regulating valve into the rotating speed of the turbine, then converts the rotating speed of the turbine into 4-20 mA electric pulse signals in direct proportion to the flow, the frequency of the electric pulse signals is in direct proportion to the flow of the fluid material to be measured, the electric pulse signals are transmitted to a PLC system in a control cabinet, and the instant flow and the accumulated flow are displayed through integrated LCD indicating meters respectively arranged in the control cabinet.

3. The small flow regulating valve is used for receiving signals from the control cabinet to control the opening degree of the valve and regulate output flow.

4. The control cabinet is used for acquiring the flow signal of the flowmeter in real time, comparing the flow signal with a set flow signal for logic processing, and then sending an adjusting signal to the small flow regulating valve. The control cabinet can be implemented by referring to the conventional technology.

5. The buffer with the pressure gauge is used for playing a role of wave-shaping and wave-flattening on the pulsating flow output by the conventional metering pump.

6. The throttle valve is used to regulate the flow and pressure in the control return line.

7. The check valve is used for preventing the backflow phenomenon of the fluid material at the outlet end of the conventional metering pump.

8. The safety valve is used to control the pressure in the inlet pipe of the conventional metering pump and prevent overpressure.

9. A conventional metering pump adopts a hydraulic double-diaphragm metering pump, the metering accuracy of the hydraulic double-diaphragm metering pump is required to be higher than +/-1% in a flow range of 10-100%, the pressure or flow at the outlet end of the hydraulic double-diaphragm metering pump is required to be in a negative deviation-free state, and a pressure gauge for monitoring double-diaphragm rupture and a calibration column for fluid material dosage are respectively configured on the hydraulic double-diaphragm metering pump.

10. The fluid material with small flow can be filled into other equipment through the outlet end of the bypass ball valve or the isolation ball valve, the flow of the small flow is less than 0.5L/h, and the flow of the metering pump is controlled to be below 10%.

Although the flowmeter, the small flow regulating valve, the buffer with the pressure gauge, the control cabinet and other accessories are common equipment types, the common equipment types are organically combined, particularly, the positive effect generated under the control of the control cabinet is very strong pertinence and novelty, and the generated beneficial effect is also obvious, so that the conventional metering pump can achieve the control precision of the flow below 10 percent, the accumulated error is reduced, and the aim of accurate metering can be achieved.

Claims

1. The utility model provides a filling device of little flow measurement, includes with medicine jar (1), level gauge (2), blowoff valve (3), Y shape filter (4), conventional measuring pump (5) relief valve (6), take pressure gauge buffer (7), bypass ball valve (8), isolation ball valve (9), flowmeter (10), little flow control valve (11), check valve (12), choke valve (13) and switch board (14), wherein dispose PLC system and other electrical control device in switch board (14), little flow means that the flow of fluid material in the medicine jar (1) is carried to conventional measuring pump (5) is below 10%, characterized by:

one side of the dosing tank (1) is connected with a liquid level meter (2) through an upper valve and a lower valve at two ends, and the bottom of the dosing tank (1) is connected with a drain valve (3);

the inlet end of a Y-shaped filter (4) is connected to the bottom of a dosing tank (1) through a valve, the outlet end of the Y-shaped filter (4) is respectively connected with a conventional metering pump (5) and a safety valve (6) in parallel through a pipeline, the outlet end of the safety valve (6) is respectively connected with a pressure gauge buffer (7) and a throttle valve (13) in series through a pipeline, the outlet end of the conventional metering pump (5) is connected with a check valve (12) after being connected with a pipeline between the pressure gauge buffer (7) and the throttle valve (13) through a pipeline, the check valve (12) is connected with a small flow regulating valve (11) through a pipeline, the small flow regulating valve (11) is connected with an isolation ball valve (9), a flow meter (10) and an isolation ball valve (9) in series through pipelines, a bypass ball valve (8) is connected in parallel on a bypass between an upper, The electric control end of the small flow regulating valve (11) and the electric control end of the flowmeter (10) are controlled by a control cabinet (14) in a centralized mode, the control cabinet (14) is used for collecting flow signals of the flowmeter (10) in real time, comparing the flow signals with set flow signals and performing logic processing, and then sending regulating signals to the small flow regulating valve (11).

2. A small flow metering filling apparatus as claimed in claim 1, wherein: the flow meter (10) is a turbine flow meter (10).

3. A small flow metering filling apparatus as claimed in claim 1, wherein: the small flow regulating valve (11) adopts a manual stroke regulating mode or an electric stroke regulating mode, the small flow regulating valve (11) is required to be provided with scale indication marks, and a valve positioner is required to be arranged at the valve position of the small flow regulating valve (11).

4. A small flow metering filling apparatus as claimed in claim 1, wherein: the conventional metering pump (5) adopts a hydraulic double-diaphragm metering pump, the metering accuracy of the hydraulic double-diaphragm metering pump is required to be higher than +/-1% within the flow range of 10-100%, the pressure or the flow at the outlet end of the hydraulic double-diaphragm metering pump is required to be in a negative deviation-free state, and a pressure gauge for monitoring double-diaphragm rupture and a calibration column for fluid material dosage are respectively configured on the hydraulic double-diaphragm metering pump.

5. A small flow metering filling apparatus as claimed in claim 1, wherein: the liquid level meter (2) is either an on-site liquid level meter or a remote liquid level meter; the on-site liquid level meter adopts a magnetic turning plate liquid level meter or a glass plate liquid level meter; the remote transmission liquid level meter adopts a double-flange liquid level transmitter.