Application case of micro vacuum pump driving sealed container for liquid collection

I. Background Introduction

In chemical experiments in laboratories, wastewater discharge testing in chemical plants, or water quality monitoring at inspection stations, certain analytical experiments require sampling, collecting, or transferring liquid samples that are corrosive, reactive with equipment materials, or contamination-sensitive. Traditional liquid pumps often fail to function properly in these scenarios. This is particularly true when transferring or collecting high-temperature liquids, corrosive liquids, oily liquids, liquids containing solid impurities, or high-viscosity liquids. When using traditional liquid pumps, these liquid media must pass through the pump, which may cause pump damage. By utilizing vacuum principles to transfer liquid media indirectly, where the medium does not pass through the pump, the range of compatible media types can be significantly expanded.

II. Application Overview for micro vacuum pump

Using a micro vacuum pump to drive a sealed container to form a vacuum system that generates negative pressure for liquid collection and transfer effectively avoids direct contact between the pump and the experimental medium while saving installation space. The vacuum system can also incorporate a control unit to manage system start/stop and precisely control the volume of collected samples.

1.Principle Description:

(1) A micro vacuum pump drives a sealed container to generate negative pressure, drawing liquid into the container.

(2) A controller (e.g., PLC, micro controller) connects to the pump’s control lines, liquid level sensors, and solenoid valves to control the volume of collected samples.

(3) The controller can operate the solenoid valve at the drain port to discharge the collected liquid.

2.Application Scenarios:

This method is suitable for extracting oily, corrosive, or solid-liquid mixed liquids and is not applicable for scenarios where direct pumping is required. For clean water or other non-corrosive, low-viscosity liquids, S-series or W-series liquid pumps can be selected.

3.Notes:

(1) The selected sealed container must have sufficient negative pressure resistance, and it is preferable to have a drainage channel at the bottom.

(2) The selected liquid level sensor must have corrosion resistance, and in some applications, it must not contaminate the medium.

III. Project Challenges

1.The micro vacuum pump must have a relatively small size while also providing high vacuum and large flow rate.

2.The micro vacuum pump must have convenient speed adjustment functionality to enable quick and precise flow rate control.

3.The micro vacuum pump must support remote start/stop control.

4.The micro vacuum pump must be capable of long-term continuous operation with a long service life.

IV. Solution

1.Hilintec’s C-series micro vacuum pumps (Chengdu) combine compact size with high vacuum and large flow rate. For example, the C50L micro vacuum pump measures 134×96×80 mm, achieves a vacuum of -61 kPa or higher, and provides a flow rate of 14.5 L/min or higher.

2.All models of Hilintec’s C-series micro vacuum pumps offer versions with speed adjustment functionality. The pumps support multiple speed adjustment methods, allowing customers to choose the appropriate version based on their needs. For example, the C30L micro vacuum pump (excluding the simplified non-adjustable version) includes versions with knob speed adjustment (via external encoder), frequency-based speed adjustment, and a premium touchscreen-adjustable version. The premium version supports both touch control and remote frequency adjustment.

3.Hilintec’s C-series micro vacuum pumps undergo rigorous lifespan testing. Each model is categorized into three versions based on lifespan and performance: “Simplified Version,” “Standard Version,” and “Premium Version.” Some models’ Premium Versions have been tested to operate continuously for up to 10,000 hours. The lifespan testing conditions are as follows: “In a clean, non-corrosive laboratory environment, the pump runs continuously at full load (inlet blocked, outlet open to atmosphere) without interruption. Ambient temperature: 5°C–33°C (varies with climate); relative humidity: 30%–90% (varies with climate).”

4.Some models of Hilintech’s C-series micro vacuum pumps have added remote start/stop control ports, allowing remote control of the vacuum pump’s operation when integrated with the user’s on-site control unit, such as models C50 and C60.