Working principle of the foam dispenser
A foam pot is a specialized tool that mixes a cleaning solution with water and creates a foam through the Venturi effect or air pressure drive. It is mainly used in areas such as car pre-cleaning and home cleaning.
How it works and the main types
Core working principles: The core of a foam pot is the mechanism that produces foam. PA kettle (pre-wash spraying tool) Utilizes the Venturi effect, when high-pressure water flows through its inner narrow larynx, the flow rate increases and the pressure decreases, forming negative pressure automatic inhalation and mixing of the car wash liquid, resulting in a delicate and dense foam. In the general sense, foam pots (or pneumatic foam pot) mainly generate pneumatic pressure by hand blowing or connecting a pneumatic pump, and the mixed liquid is sprayed out in the form of foam.
The difference between PA pot and foam pot: the main difference between the two lies in the source of power and working principle.
PA pot: It relies on negative pressure suction generated by high-pressure water flow (usually ≥ 8 MPa), without the need for an additional air pump, and is the core tool of the professional car wash pre-wash process.
(Air pressure) foam pots: They rely on external air pressure (provided manually or by air pump) to promote liquid foaming, and some models can be used independently of a high pressure cleaning machine.
Common types and expanded uses:
Electric / pressurized foam pot: Works with a built-in motor or pressurized device for home cleaning (e.g. hand washing, pet bathing, kitchen cleaning) and foams quickly and delicately.
Manual air pressure foam pots: They require manual pumping and have a shorter pressure maintenance time, but are usually more affordable.
Excess foam pot: directly pumps fluid to bubble through an electric pump, without pre-pressure, and immediately activates, but may affect the aspiration due to blockage.
Use steps and warnings
The proper use of foam pots can significantly improve the cleaning effect and protect the cleaning surface (such as car paint). The main steps are as follows:
Preparation: Make sure the foam pot is clean and free of impurities. Mix the liquid in the proportions specified in the car wash liquid and pour it into the kettle, taking care not to exceed the maximum capacity scale.
Connected devices:
For a PA pot with a high-pressure washing machine, use a quick plug connector to firmly connect it to the water gun and check the tightness.
For air pressure foam pots, connect them tightly to a pump or compressed air source to check if they are leaking.
Mixing and adjusting: Cover the lid and shake to mix the liquid evenly. Turn on the device to adjust the initial pressure and flow pattern to a moderate state (avoid excessive pressure damage to the surface).
Sprinkler operation: When spraying, keep the head of the spray from the clean surface about 20-30 cm away and sprinkle at a 45 degree angle. Starting at the top and going down in sequence, the foam should be evenly covered.
Cleaning and maintenance: Rinse the interior and the head of the foam pot with water in time after use to prevent the residue of the car wash liquid from drying out and blocking, affecting the next use.
Buying Guide and Market Overview
When shopping for a foam pot, you need to consider the use scenario, equipment compatibility and budget. Here are some key considerations:
Matching cleaning equipment: If you have a high-pressure washing machine, you should give priority to the PA pot compatible with its interface (usually 1 / 4 fast plug interface). If it is mainly used for daily household cleaning and there is no high pressure equipment, consider electric or manual air pressure foam pots.
Focusing on materials and design:
Material: The pot body is usually transparent (easier to observe the residue) or stainless steel; The spray cores / filter mesh materials affect durability, and stainless steel or copper are more resistant to corrosion.
Design: The "big mouth" design helps to create a thicker foam; Adjustable sprayheads can adapt to different needs.
Reference market products: foam pot products on the market are rich, the price ranges from dozens to hundreds of yuan, mainly divided into PA pot (for high pressure car washing) and independent use of air pressure / electric pot.