In the case of a refrigeration scroll compressor, the amount of fuel injected is much smaller than that of a scroll air compressor, so early studies have neglected the leakage of the lubricating oil and simplified it into a pure gas leak. However, the mutual solubility of the refrigerant gas and the lubricating oil is very good, and it is obviously not in accordance with the actual situation without considering the mixing of the two. Therefore, in recent years, most of the literature has mixed oil and gas as a homogeneous fluid mechanical movement. It is generally assumed that the two are equal in speed and have no heat exchange. As the gas leaks from the high pressure zone to the low pressure zone, the gas leaks from the lubricating oil due to the pressure drop, causing gas leakage. This model is more in line with the actual situation and has certain universality.

Further research on the flow state of the leakage working fluid is carried out. It is considered that the single-phase leakage depends on the size of the leakage channel, and the solution method of the critical gap value is given. When the leakage passage between the vortex chambers is small, the lubricating oil with a large viscosity fills the entire narrow leakage gap, and the blocking effect of the oil greatly limits the leakage speed, and the leakage amount is small, and only the leakage channel exists. Single-phase leakage of pure oil; when the gap between the vortex chambers is too large, the blockage of the oil can only play a limited role, and the lubricating oil entering the gap can not flow out of the entire leakage passage, and the leakage passage not only exists Oil leaks, and high-pressure gas also flows from the leak passage into the low-pressure working chamber, and the leak is caused by the mutual leakage of gas and oil. Generally, the single-phase leakage of lubricating oil is low when the rotational speed is low in the initial stage of compressor operation; as the rotational speed increases, the single-phase leakage of lubricating oil is converted into two-phase leakage of gas and oil, and both are laminar. After the speed is further increased, the gas and oil leaks become completely turbulent.

Overmolding Service

Overmolding is a type of Injection Molding process that combines multiple materials into a singular part or product. Overmolding can be used to combine similar materials of a different color, or to combine materials for functional purposes, such as giving a product a soft grip.

Overmolding Process Selection
The decision which of the possible processes and mold design to select depends on:
Materials selected
Production quantities required
Methods available at the production location
Capital available for tooling
Local labor cost

Overmolding materials
Overmolding Plastic on Metal
When overmolding plastic on metal, the durable plastic is molded over the metal component. Overmolding plastic on metal is often used in manufacturing plastic handles on metal tools and in the medical, aerospace, and consumer goods industries.
Overmolding Plastic on Plastic
When overmolding plastic on plastic, the more rigid plastic component is first molded, and then the more durable plastic material is molded over the previous plastic part. This process is often used to create handheld devices, soft grips for consumer products, and a wide range of medical devices.

Wide range for the overmolding service, we have served many oversea customers to meet their requirement and also help them to save much cost by overmolding service to replace assembly.

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