Illustration of Mobile Toilet Foaming Device

Currently, there is no publicly available detailed illustration of the foaming device for mobile toilets, but a structured analysis can be conducted through its core components and working principles, as follows:

I. Core System Components

1. Foaming Device Main Body

   • Liquid Tank: Stores concentrated foaming liquid, typically made of corrosion-resistant materials (such as PE plastic), with a capacity designed to be 10-50L based on usage frequency, equipped with a liquid level sensor for automatic replenishment.
   • Air Pump: Mixes the foaming liquid with air through compressed air (pressure 0.2-0.5MPa), with key parameters including flow rate (5-15L/min) and power (100-300W), requiring matching with foam generation efficiency.
   • Control System: Utilizes PLC or a single-chip microcomputer for precise control, allowing adjustment of the mixing ratio of foaming liquid to water (usually 1:50-1:100), and integrating fault alarm functions.

2. Mixing Unit

   • Static Mixer: Ensures thorough mixing of the foaming liquid and water through spiral baffles, ensuring foam uniformity, with mixing time controlled within 3-5 seconds.
   • Air Injection Valve: Uses a solenoid valve to control air flow, cooperating with a pressure regulator to stabilize foam density (density range 0.02-0.05g/cm³).

3. Conveying and Covering System

   • Foam Conveying Pipeline: Made of PVC or stainless steel, with a diameter of 15-25mm, conveying foam to the toilet through a peristaltic pump or gravity flow, with conveying speed matching foam generation speed.
   • Weighted Baffle: Installed above the sewage outlet, forming a dynamic seal through gravity to reduce foam loss (baffle angle usually 45°-60°).

II. Working Mechanism

1. Trigger Phase

   • After an infrared sensor or foot switch detects that the user has left, the system initiates the foaming program, with an adjustable delay time (usually 2-5 seconds).

2. Foam Generation and Conveyance

   • The air pump injects compressed air into the liquid tank, and the foaming liquid is mixed with water in proportion through the mixing unit, generating fine foam through a microporous foamer (pore size 0.1-0.3mm).
   • The foam is pumped through the conveying pipeline to the surface of the toilet, requiring coverage of over 90% of the inner wall of the toilet and forming a 3-5mm thick sealing layer.

3. Odor Prevention and Maintenance

   • The foam sealing layer effectively blocks odor diffusion while reducing sewage splashing.
   • When the sewage tank is full, the intelligent control system triggers an alarm through a liquid level sensor, prompting cleanup (full capacity usually 200-500L).

III. Key Design Optimizations

• Low-Temperature Adaptation: In northern regions, the liquid tank needs to be equipped with an electric heating tape (power 50-100W) or ethylene glycol antifreeze (concentration 20%-30%) to ensure normal foaming at an ambient temperature of -20°C.
• Energy-Saving Mode: Reduces energy consumption through a timed foaming function (such as automatically replenishing foam every 30 minutes), with single foaming energy consumption controlled within 0.1kW·h.

Suggestion: For specific illustrations, contact equipment suppliers (such as Inner Mongolia Riyue Mobile Toilets) for technical manuals, or refer to the structural diagrams in the industry standard 'Technical Specifications for Mobile Toilets' (GB/T 38837-2020).