Circulating Water Vacuum Pump: Daily Use, Maintenance, and Troubleshooting Guide

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Date: 2025-10-22Read: 0

As a commonly used vacuum acquisition equipment in laboratories, the stable operation of circulating water vacuum pumps directly affects experimental efficiency and accuracy of results. Most equipment failures are caused by improper operation or maintenance negligence. Therefore, mastering scientific usage methods, regular maintenance procedures, and troubleshooting skills is the key to extending the equipment's service life and ensuring smooth experiments. This article will elaborate on the core points of equipment management from three aspects: daily operation essentials, periodic maintenance methods, and common troubleshooting solutions.

Part 01

Daily use: key operating points

The standardization of daily operations is an important defense line to avoid equipment failures, and it is necessary to focus on four dimensions: water quality, anti backflow, environmental adaptation, and operating habits.

1. Water quality management: the core of equipment stability

Water quality directly determines the rate of loss of internal components in equipment and is of utmost importance in daily management.

(1) Prioritize using distilled water or deionized water and avoid using hard water. The minerals in hard water will gradually condense into hard scale, which adheres to the surface of the impeller and the inner wall of the waterway, leading to a decrease in vacuum degree and flow rate. In severe cases, it can increase the load on the motor and even cause it to jam.

(2) Regularly replace the water in the water tank, and it is recommended to replace it at least once a week. If solvent vapor is frequently extracted during the experiment, or if turbidity or impurities are observed in the water quality, it is necessary to immediately replace the water to prevent pollutants from blocking the pipeline.

(3) Before starting up, it is necessary to check the water level to ensure that it meets the specified range in the product manual. A low water level can cause the equipment to be unable to pump water and create a vacuum; If the water level is too high, it is easy to cause water spraying, which affects the experimental environment and equipment safety.

2. Anti backflow suction: the key to avoiding equipment damage

Backsuction is a common problem that causes internal corrosion, component damage, and experimental failure in equipment.How to prevent backflow?

(1) Connect a buffer bottle in series between the vacuum pump and the experimental device, which can temporarily hold the liquid being sucked back to prevent the liquid from directly entering the pump body.

(2) Using check valves for mechanical protection, our company's vacuum pumps have built-in vacuum check valves that can prevent liquid from flowing in the opposite direction; If using equipment from other brands, it is recommended to install an additional check valve before the pump's suction port to ensure double protection against backflow.

3. Environment and load: Adapt to device operation requirements

The operating environment and load type of the equipment will affect its service life, and it is necessary to plan the usage conditions reasonably according to the characteristics of the equipment.

(1) The equipment should be placed in a well ventilated area away from direct sunlight, with an ambient temperature controlled between 5-40 ℃. Good ventilation can help dissipate heat from the equipment and prevent high temperatures from affecting motor performance.

(2) If corrosive gases or organic solvent vapors need to be extracted, it is recommended to install corresponding absorption bottles and cold traps (such as using liquid nitrogen cold traps to condense solvents) before the inlet. Untreated corrosive gases can directly corrode the internal components of the pump body, shortening the lifespan of the equipment.

4. Good operating habits: the foundation for reducing human errors

Standardized operating habits can reduce malfunctions caused by human errors, and the following two checks need to be implemented before each use:

(1) Check the airtightness of the system: Before starting up, confirm one by one whether all vacuum interfaces, pipelines, and connections are tight. If there are gaps, it will cause air leakage and affect the vacuum degree. It is necessary to adjust or replace the sealing components in a timely manner.

(2) Check the placement status of the equipment: Ensure that the pump body is placed on a horizontal and stable table to avoid increased equipment vibration, noise, or damage to internal components caused by tilted tables.

Part 02

Daily maintenance:

The core of extending the service life of equipment

Regular maintenance can slow down the aging rate of equipment components and reduce the probability of failure. Targeted maintenance operations should be carried out according to fixed cycles.

Maintenance Interval	Maintenance Items	specific operations
After each use	Daily cleaning	1. Use a dry cloth to wipe off water stains and dirt on the surface of the pump body to prevent residual liquid from corroding the casing; If it is no longer used in the short term, the water in the tank needs to be emptied.
Weekly or as needed	Change water and clean the water tank	1. Drain the old water from the water tank; 2. Wipe the inner wall of the water tank with a soft cloth to remove any attached biofouling and scale; 3. Add new water to the designated water level.
Monthly or quarterly	System cleaning (descaling)	1. Drain the water from the water tank; 2. Add diluted citric acid or acetic acid solution to the water tank; 3. Turn on the device and let the cleaning solution circulate for 15-30 minutes; 4. Drain the cleaning solution and rinse the water tank and pipelines 2-3 times with plenty of clean water to avoid residual acid corroding the components.
biannually	Check the sealing ring and pipeline	1. Check whether the sealing ring on the exhaust nozzle has aged or cracked, and replace it in a timely manner if it is damaged; 2. Check whether the vacuum pipeline is aging or cracked, and replace the pipeline immediately if any problems are found. Long term shutdown of the pipeline
Long term discontinuation	Evacuation and protection	1. Drain all accumulated water from the water tank and pump body to prevent low-temperature freezing, component cracking, or internal corrosion caused by accumulated water; 2. Clean and dry the inner and outer surfaces of the equipment; 3. Wear a dust cap on the exhaust port to prevent dust from entering; 4. Store the equipment in a dry and dust-free environment.

Part 03

Common faults:

Quick investigation and handling plan

If any abnormalities occur during equipment operation, it is necessary to accurately locate the cause based on the fault phenomenon, follow the principle of "easy first, difficult later" for troubleshooting, and avoid blind disassembly.

Fault phenomenon	Possible reasons	Treatment measures
The motor is not working	Damaged fuse link	Replace the fuse link of the same model
The motor is not working	Capacitor damage, motor winding burnout, severe bearing wear and jamming, impeller jamming, circuit failure	Immediately stop using the equipment and contact professional maintenance personnel for inspection
Decreased vacuum pumping ability	The water temperature in the water tank is too high	Check the experimental load to determine if the water temperature has increased due to the extraction of high-temperature gas, and replace the cold water if necessary
	The motor speed is too low	Check if the power supply voltage is stable and ensure that the voltage meets the rated requirements of the equipment
	Jet injector and check valve are blocked by dirt	Disassemble the jet injector and check valve, rinse them with clean water, and reinstall them
	Jet injector and check valve are corroded	Replace the corroded jet injector or check valve
	The filter screen of the inlet pipeline is blocked	Remove the filter, clean the attached impurities, and then reinstall it
	Vacuum pipeline blockage or rupture	Clearing blocked pipelines; If the pipeline ruptures, replace it directly with a new pipeline
No vacuum pumping	Impeller detachment or motor not starting	Stop using the equipment and contact professional maintenance personnel for assistance
The vacuum gauge displays inaccurate values	Vacuum gauge has water or air leakage	Clear the accumulated water in the vacuum gauge and adjust the gauge needle to zero position; Check the sealing of the watch body and repair the leakage point
Motor overheating and excessive noise	Bearing wear or impeller deformation	Stop using the equipment and contact professional maintenance personnel to replace bearings or impellers
Motor overheating and excessive noise	Voltage instability or low voltage	Install a voltage regulator or wait for the power supply voltage to stabilize before using the equipment
water leakage	Loose components or aging sealing rings	Tighten loose components; If the sealing ring is aging, replace it with a new one
water leakage	Water tank rupture	Replace with a new water tank

Part 04

Core Summary:

Key principles of equipment management

Prevention priority:Most equipment failures are caused by improper use or water quality issues. As long as you insist on frequent water changes and regular descaling, you can avoid most common failures and reduce maintenance costs.

Organized investigation:When encountering faults, start with simple inspection items such as water level, power supply, and pipeline sealing, and then gradually troubleshoot complex components such as motors and impellers to avoid missing basic problems.

Safety is important:Before conducting any internal maintenance, the power plug must be unplugged to prevent electric shock; The maintenance of core components such as motors and impellers should be carried out by professional technicians to avoid safety accidents or further damage to the equipment.

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