1、 What is a vertical circulating water vacuum pump

The vertical circulating water vacuum pump is a commonly used coarse vacuum pumping equipment in laboratories. It uses room temperature clean water as the working medium and relies on water circulation to form negative pressure to extract gas from a closed container. Unlike traditional desktop models, the whole machine adopts a vertical integrated structure, with the water tank, pump body, and motor arranged vertically, occupying a smaller area and having a larger water circulation volume. It is specially designed for conventional negative pressure operations such as chemical experiment filtration, vacuum distillation, and rotary evaporation. The Shanghai Yetuo vertical circulating water vacuum pump is the mainstream supporting equipment for laboratory pretreatment.

2、 Core working principle

The device is equipped with a built-in water circulation pump body, and the motor drives the impeller to drive the high-speed circulation of water in the water tank. When the water flows through the Venturi jet tube, the flow velocity increases sharply, forming a negative pressure vacuum inside the pipeline. The external exhaust port continuously extracts air from the reaction bottle and the filter bottle; The gas mixed with water vapor flows back to the storage tank with the water flow, and the gas and water are automatically separated. The gas is discharged from the top exhaust port, and the water is recycled and reused without the need for continuous replenishment.

The whole machine relies on water to complete the triple functions of sealing, pumping, and cooling, without oil medium, and will not produce oil vapor to contaminate the sample. It belongs to the clean type rough vacuum pump.

3、 The core characteristics of vertical structure compared to desktop structure

1. Vertical integrated layout, saving countertop space

The water tank is vertically placed at the bottom of the machine body, with the pump body and motor on top. The narrow body vertical design of the whole machine only occupies a small experimental platform, solving the problem of traditional horizontal circulating water pumps being bulky and occupying the operating platform. It can be placed in small laboratories and fume hoods.

2. Large capacity vertical water tank with good cooling effect

The vertical water storage tank has a larger capacity and sufficient water storage capacity. The water temperature rises slowly during long-term continuous pumping, and the vacuum degree attenuation amplitude is small. It is suitable for continuous operations such as rotary evaporation and long-term vacuum distillation, and is less likely to cause a decrease in pumping force due to high water temperature.

3. Optimized heat dissipation structure for more stable operation

The water flow circulates from top to bottom, coupled with the heat dissipation holes on the side of the body, and the motor and water circulation pipeline dissipate heat synchronously. It is not easy to overheat after long-term operation and can run continuously throughout the day.

4. Convenient maintenance and water addition

The top of the body is equipped with a water inlet, and there is a transparent water level observation window on the side, which can visually check the water level; The bottom is equipped with a drain valve, making it easy to drain the wastewater and clean the water tank after the experiment.

4、 Core structure composition

1. Vertical water storage tank: made of anti-corrosion plastic material, with large capacity water storage, circulating water supply, and transparent water level visible window;

2. Water circulation jet pump body: Multi channel suction head, conventional dual meter dual suction, four meter four suction optional, can be simultaneously connected to multiple experimental devices;

3. Drive motor: Silent fan water motor, driving the water body to spray at high speed to form negative pressure;

4. Vacuum pressure gauge: Real time display of negative pressure values, intuitive control of experimental vacuum conditions;

5. Anti backflow suction device: equipped with a check valve to prevent water from flowing back into the reaction vessel after shutdown, avoiding sample damage;

6. Drainage valve and water inlet: quick water change, convenient for daily cleaning and maintenance.

5、 Main application areas

1. Pre treatment of chemical laboratory

Vacuum distillation, vacuum filtration, solid phase extraction, solvent concentration, and rotary evaporator are used to extract herbs and purify organic synthesis.

2. Food and Environmental Testing Laboratory

Water quality and soil sample filtration and separation, food residue extraction and filtration, rapid solid-liquid separation of samples before testing.

3. University teaching laboratories

Basic chemistry training, negative pressure operation in physical and chemical experiments, high cost-effectiveness, simple operation, suitable for students to use in batches.

4. Small supporting equipment

Paired with a vacuum drying oven and a small glass reaction vessel, providing a basic rough vacuum environment.

6、 Advantages and disadvantages of vertical circulating water vacuum pump

advantage

1. Oil free design, no oil mist pollution, suitable for samples with basic cleanliness requirements;

2. Using water as a medium has extremely low procurement and usage costs, requiring only regular replacement of tap water;

3. Equipped with anti backflow and multi tap design, multiple experiments can be conducted simultaneously;

4. It is compact and does not take up much space vertically, with low noise and low operating threshold, making it easy for beginners to get started;

5. Corrosion resistant chamber, conventional weak acid, weak alkali water vapor is not easy to corrode the body.

limitation

1. It can only achieve rough vacuum and is limited by water temperature, making it unsuitable for medium to high vacuum conditions such as freeze-drying and high vacuum coating;

When extracting a large amount of volatile organic solvents, the water in the water tank is prone to pollution and needs to be changed frequently;

3. Low water temperature in low temperature environments during winter may slightly affect the pumping efficiency.

7、 Summary of applicable population

Shanghai Yetuo vertical circulating water vacuum pump is an entry-level vacuum equipment with high cost-effectiveness. It focuses on laboratory conventional chemical pretreatment and has no oil return pollution compared to rotary vane oil pumps. It is also cheaper than diaphragm pumps; Vertical structure optimization of space utilization is a universal equipment for daily filtration and distillation in universities, third-party testing, and small R&D laboratories.