What is a fully automatic hydraulic tube-expanding machine?

Release Date:

2023-02-10 15:42

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　　The fully automatic liquid‑ring compressor highlights the numerous advantages of hydraulic diameter reduction, while the hydraulic diameter‑reduction plant showcases common industrial equipment used in everyday applications. First, users should gain a deeper understanding and pay closer attention to these key benefits, thereby ensuring the instrument’s and equipment’s ease of use in a more rational manner. In this regard, we provide a detailed overview of its diameter‑reduction machinery and related devices; the following sections will explore this topic together. A fully automatic liquid‑ring compressor is a type of compressor whose operating principle relies on an eccentrically mounted impeller within a cylinder, into which a specific quantity of water or another liquid is introduced. As the impeller rotates off‑center inside the cylinder, the volume of the crescent‑shaped chamber formed by the liquid ring adhering to the cylinder wall and the impeller itself undergoes periodic changes. When the discharge pressure of such a compressor falls below 0.2 MPa, it is classified as a rotary compressor for compressing and conveying gases—commonly referred to as a liquid‑ring blower. The operating principle of the automatic liquid‑ring compressor involves positioning the impeller eccentrically within the cylinder and introducing a measured amount of water or other liquid into the chamber. As the impeller (rotor) spins up to a certain speed, centrifugal force flings the liquid outward, creating a continuous liquid ring that clings to the inner surface of the cylinder. Between the impeller surface and this liquid ring, a crescent‑shaped cavity is established, comprising multiple small chambers of varying volumes (initial volumes). With each revolution of the impeller, the volume of these chambers alternately expands and contracts in a cyclical manner. Correspondingly, intake and exhaust ports are provided at both ends of the cylinder. Thus, once the impeller begins to rotate, the process of intake, compression, exhaust, and possibly expansion can be carried out within each basic chamber. During gas discharge, some liquid is entrained along with the gas, necessitating the addition of a fresh supply of liquid at the suction inlet.

　　When an automatic liquid‑compression radial pump is operating, the energy losses caused by the impeller’s agitation of the fluid are very substantial—almost equal to the work required to compress the gas. Consequently, the efficiency of such a fully automatic liquid‑compression radial pump is quite low. Typically, vacuum pumps consume only modest amounts of power; therefore, fully automatic liquid‑compression radial pumps are often employed as vacuum pumps. To prevent excessive hydraulic losses, the peripheral velocity at the impeller’s outer rim is generally limited to 14–16 m/s, and liquids with low viscosity are selected whenever possible.

　　Fully automatic liquid‑compression diameter‑reduction machines feature a simple structure, ease of manufacture, straightforward operation, few wear parts, and low exhaust pulsation and noise. Moreover, the liquid provides adequate cooling, resulting in very low discharge temperatures for the compressed gas; thus, these machines are well suited for compressing gases that readily decompose at elevated temperatures, such as acetylene and hydrogen sulfide. Since the compression medium does not come into direct contact with the cylinder, these machines are also particularly appropriate for handling highly corrosive gases. In such cases, a non‑reactive liquid—such as concentrated sulfuric acid during compression—can be selected as the sealing fluid.

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