Product Overview:

overview

The QYB type gas-liquid mixing pump is a series of horizontally installed self-priming gas-liquid mixing pump products. The QYB adopts a standard click coupling connection form. The overcurrent components of the pump are all made of precision cast stainless steel material.

The suction port of the gas-liquid mixing pump can use negative pressure to suck in gas, so there is no need to use gas compressors and atmospheric injectors. The high-speed rotating pump impeller stirs the liquid and gas, so there is no need for a stirrer or mixer. Due to the pressurized mixing inside the pump, the gas and liquid are fully dissolved, and the dissolution efficiency can reach 80-99%. So there is no need for large pressurized gas tanks or expensive reaction towers to produce highly soluble solutions. A gas-liquid mixing pump can perform gas-liquid suction, mixing, dissolution, and directly deliver highly dissolved liquid to the point of use. Therefore, the use of gas-liquid mixing pumps can improve the efficiency of dissolved gas-liquid production, simplify the production equipment, save space, significantly reduce initial investment, and save operating and maintenance costs.

Product features:

characteristic

By utilizing the special stirring function of the Jingke vortex pump, gases or two or more different liquids that are difficult to dissolve in water can be pressurized and mixed. Jingke's mixing technology greatly simplifies traditional mixing processes, not only achieving equipment miniaturization but also saving investment costs.

Application of pressurized dissolved air flotation

The pressurized dissolved air flotation system using Jingke gas-liquid mixing pump eliminates complex devices such as pressure pump, air compressor, jet generator, high-pressure container tank, and release device. It has high mixing efficiency, simple operation and maintenance, and can solve many problems such as inevitable release device blockage, atmospheric bubble turbulence, and pressure pump failure in traditional processes. It has a high content of nano fine bubbles and good water treatment effect.

Usage and Operation

1. Operation steps:

1) Before the initial operation, fill the pump with water, then fully open the inlet and outlet valves, close the inlet valve and outlet pressure gauge, and briefly turn on the power of the pump to confirm that the rotation direction of the pump is correct before entering formal operation. Before turning on the power during normal operation, be sure to close the intake valve (when manually controlled)

2) Gradually reduce the inlet control valve until the negative pressure on the vacuum gauge shows -0.1kgf/cm to 0.3kgf/cm, then open the suction valve. Open the check valve of the outlet pressure gauge and adjust the control valve of the outlet pipeline until the set outlet pressure is reached.

3) Fine tune the inlet pipeline control valve, suction valve, and outlet pipeline control valve until the liquid flow rate, gas flow rate, and outlet pressure reach the predetermined values. The gas injection amount is about 7-8% of the water injection amount, not exceeding 10%. Example: When the water injection rate is 301/min, the gas injection rate is 2.4-3.01/min. When the water injection rate is 501/min, the gas injection rate is 4.0-5.01/min

4) After the water flow rate, intake volume, and outlet pressure reach the temple values, normal operation can be achieved.

5) When stopping the operation of the pump, first close the suction valve, and then turn off the pump.

2. Precautions:

1) As the suction volume of the pump increases, the discharge flow rate and pressure will gradually decrease. When the suction volume exceeds a certain limit, the pump will experience flow interruption, that is, it will lose its function.

2) When selecting a gas-liquid mixing pump, please refer to the pump's performance parameter table. The discharge pressure of the pump is generally set to 2-3kgf/m for the purpose of mixing odorous oxygen, and 3.5-4kgf/cm for the purpose of dissolved air flotation and oxygenation treatment. When the gas injection ratio is 7-8%, please choose a pump with a flow rate greater than the actual discharge flow rate.

3) The outlet pressure required to generate microbubbles usually does not exceed 4kgf/cm. When the pressure exceeds 4kgf/cm, there is no significant change in the straight and dissolved gas volume of the bubbles, only reducing the amount of dissolved gas and liquid discharged and increasing the power consumption of the pump.

4) Setting of gas injection volume:

The dissolved amount of gas in water is generally 3% of the water flow rate (saturated dissolved amount at normal pressure). The gas injection amount of the gas-liquid mixing pump should be greater than the saturated dissolved amount, and it is recommended to set it at 7-8% of the water flow rate, not exceeding 10%. In addition, the undissolved part of the gas injected into the pump flows in the form of large bubbles in the pipeline, which may form gas pockets at the pressure relief valve and affect the occurrence of microbubbles. So it is recommended to install a gas-liquid separation tank before the pressure relief valve to discharge excess gas. The size of the gas-liquid separation tank is generally set according to the flow rate, but for convenience, it is set according to the diameter of the pump's drainage port as follows:

5) For the purpose of suction effect, gas suction nozzles are generally used at the suction port of the pump. The nozzle guides gas into the vicinity of the impeller and smoothly introduces gas and liquid into the pump's flow channel with the help of the impeller's rotational force. The use of gas nozzles enables stable inhalation and dissolution of gases. It is recommended to equip the gas nozzle with a one-way check valve to prevent the reverse overflow of liquid. The combination of one-way check valve and solenoid valve can basically avoid the reverse overflow of liquid. How to use manual control for gas-liquid mixing device, one-way check valve and solenoid valve can be omitted, but the operating procedure should refer to the operating instructions.

6) To generate good microbubbles, the design of the discharge pipeline behind the pressure relief valve should pay attention to the following:

A， The diameter of the drainage pipeline should be the same or larger than the outlet diameter of the pump;

B， The top outlet of the drainage pipeline should be set horizontally or upwards, and cannot be set downwards;

C， When releasing microbubbles from the hole, the diameter of the gas should not be less than 10MM;

D， The length of the drainage pipeline before the outlet valve is generally set to 0.5-1m, and the pipeline after the outlet valve should be as short as possible;

E， Gas flow meters are used to adjust and control the amount of gas inhaled. The material of gas suction nozzles and gas flow meters is generally determined by the medium of the inhaled gas and liquid, and stainless steel is required for use in ozone equipment.

7) Inhalation pipeline

A， The diameter of the suction pipe is generally the same as or larger than the suction diameter of the pump;

B， When using negative pressure to suck in gas, the suction diameter sometimes needs to be one level thinner, but not too thin;

C， When the liquid level of the water supply tank is lower than the center height of the pump, a bottom valve should be installed at the lower end of the suction pipe;

D， The suction pipeline should be equipped with a filter screen or Y-shaped filter (60 mesh) to prevent solid substances in the liquid from damaging the pump impeller.

4、 Maintenance and upkeep

When maintaining the pump, be sure to turn off the power, as the pump may suddenly rotate and cause danger due to automatic control.

1. Precautions to be taken during daily inspections:

1) If there are significant abnormalities in pressure, voltage, vibration, noise, etc. compared to normal conditions, it is a precursor to an accident and should be immediately stopped for maintenance. In addition, to avoid any unforeseen circumstances, it is recommended to use a backup pump;

2) The allowable temperature rise of the bearing shall not exceed 80 degrees. The temperature of the motor casing is normal when it can be touched by hand, otherwise please stop the machine for inspection;

3) Under normal mechanical seal conditions, the leakage rate should not exceed 3ml per hour. If the leakage exceeds this limit and gradually increases after normal operation, please stop the machine immediately for inspection;

4) Under normal installation and connection, if there is strong vibration during operation, it indicates that the pump is under excessive pipeline pressure or the foundation bolts are loose, and it needs to be stopped for inspection;

2. Regarding the operation of the pump, please refer to the following items:

1) When the pump operates beyond the specified pressure (head), it may cause overload operation, resulting in motor burnout.

Special reminder: Do not close the valve on the discharge pipeline during operation!

2) The gas-liquid mixing pump may produce some metallic sounds during high-pressure operation, which is an inherent characteristic of the gas-liquid mixing pump and not an abnormality;

3) Frequent starting and stopping can cause damage to the pump. Suggest motor power ≤ 4kw, no more than 100 starts per hour, and electric power>4kw, no more than 20 starts per hour. If you find that the startup is too frequent, adjust the control device to reduce the start stop frequency. It is necessary to check the installation situation at this time.

4) When there is a power outage, the power supply to the pump must be cut off to prevent the pump from suddenly starting and causing danger when it is reconnected.

3. The storage method for pumps that have been out of use for a long time is as follows:

1) When not in use in winter, it is necessary to perform insulation treatment or drain the accumulated water inside the pump to prevent the pump casing from freezing and cracking;

2) The backup pump should be operated regularly to make it available at any time.

4. Vulnerable parts of the pump

1) When ordering spare parts, please indicate the correct pump model according to the standard configuration.

Note: The above replacement time is a reference value under normal usage conditions.

2) When ordering spare parts, please indicate the correct pump model according to the standard pump specifications.

5、 Disassembly and assembly

Please follow the following procedure for disassembly and assembly:

1. Dismantling

1) Disassemble the pump cover bolts and remove the pump cover;

2) Loosen the impeller set screw (integrated) and remove the impeller from the pump shaft. If the impeller is difficult to remove, please use bolts to screw into the two screw holes on the impeller and pull it out; (Split type) Use bolts to screw into the two screw holes on the impeller and pull it out.

3) Remove the flat key from the pump shaft and wipe off the fixing marks.

4) Remove the mechanical seal moving ring (integrated)

5) Remove the bolts that fix the pump body to the bracket flange, remove the pump body, and the static ring of the mechanical seal can be removed together with the pump body. Loosen the pump body and seal cover nut, remove the seal cover and nut, and remove the mechanical seal dynamic ring and static ring. Please be careful not to scratch the sealing grinding control surface.

2. Assembly

The program is the opposite of the disassembly program, but please note the following:

1) The friction surface of the mechanical seal should be wiped clean with a clean and soft cloth, and care should be taken not to scratch the friction surface;

2) The impeller should be installed between the pump body and the pump cover, and the fixing marks on the pump shaft should be wiped off before disassembly. Adjust the clearance between the impeller and the pump body: (integrated) Install the impeller onto the shaft and push it towards the pump body until it reaches the angle of the pump body. Loosen the impeller fastening screw with contempt, then gently tap the pump shaft end and use its rebound force to move the impeller. After the clearance is correct, install the pump cover and rotate the pump shaft. If the pump shaft rotates smoothly and easily, the impeller tightening bolt can be tightened. (Split type) Install the impeller onto the shaft, push it towards the pump body until it touches the pump stop, press the anti slip plate, gently tighten the impeller guard, and then tap the pump shaft end to use its rebound force to move the impeller. After the clearance is correct, install the pump cover and rotate the pump shaft. If it can be easily and smoothly rotated, stop the retraction and knock the impeller into the retaining groove.

3) Replace the O-ring and gasket.

4) Replace various worn parts.

5) The bolts must be tightened evenly during transportation, and do not tighten one before tightening another.

6) After installation, there should be no jamming or looseness when rotating the pump shaft.

Performance parameters:

Main specifications and technical parameters of gas-liquid mixing pump

Application areas: