Shielded pump performance characteristics and selection (2)

(3) Prolonged operation at low flow rates can lead to poor efficiency in shielded pumps, which may cause overheating and liquid evaporation. This can result in dry running of the pump, ultimately damaging the sliding bearings. 3. Types and Application Scope of Shielded Pumps Shielded pumps are classified based on factors such as temperature, pressure, viscosity, and the presence of solid particles in the fluid being transported. The main types include: (1) Basic Type This type is suitable for media with temperatures not exceeding 120°C and head up to 150 meters. It serves as a foundation for other specialized shielded pump designs, which can be modified and improved accordingly. (2) Reverse Cycle Type In this design, the direction of the fluid flow through the bearing lubrication, cooling, and motor cooling is opposite to that of the basic type. Its key advantage is reduced risk of cavitation, making it ideal for transporting volatile liquids such as liquefied petroleum gas or chloroform. (3) High-Temperature Type Designed for media with temperatures up to 350°C, these pumps can handle flows up to 300 m³/h and heads up to 115 meters. They are commonly used for hot oil and hot water applications. (4) High-Melting Point Type These pumps feature an insulated jacket around the motor, enhancing its heat resistance. They are suitable for liquids with melting points up to 250°C. The jacket can be heated with steam or a preheated liquid to prevent crystallization. (5) High-Pressure Type The housing of this pump is designed as a high-pressure container, allowing it to withstand significant system pressures. The stator coil is also reinforced to resist internal pressure. (6) Self-Priming Type This type can automatically draw liquid from the suction line even when it's not initially filled. It is well-suited for extracting liquids from underground tanks. (7) Multi-Stage Type Equipped with multiple impellers, these pumps are ideal for high-head applications, capable of lifting fluids up to 400 meters. (8) Slurry Type Designed for handling liquids containing large amounts of solids or mud, this type ensures reliable performance in challenging conditions. 4. Precautions for Selecting Shielded Pumps Shielded pumps typically use a portion of the transported liquid to cool the motor. Due to the small annular clearance, the liquid must remain clean. If the fluid contains sediments, deposits, or gels, non-slurry-type shielded pumps may become clogged, affecting cooling and lubrication. This can lead to damage to the graphite bearings and motor failure. Additionally, shielded pumps are often equipped with circulating cooling systems. When the ambient temperature is below the freezing point of the pumped liquid, anti-freezing measures should be taken to ensure smooth startup. During start-up, the outlet valve should be opened before the inlet valve. When stopping, the outlet valve should be closed first, followed by the inlet valve. Proper sequencing is essential to avoid damage to the pump. In summary, shielded pumps offer complete leakage prevention, effectively reducing environmental pollution and material loss. With proper selection and stable operating conditions, they can run smoothly with minimal maintenance. They are the preferred choice for pumping flammable, explosive, corrosive, and high-value liquids.

Brick Anchor

Easy-to-use refractory anchor bricks. Including the anchoring brick body, the middle of the left side of the upper surface of the anchoring brick body is provided with a triangular prism-shaped hanging groove, one of the side surfaces of the hanging groove is located on the upper surface of the anchoring brick body, and one of the bottom surfaces of the hanging groove is located on the right side of the anchoring brick body. The lowermost end of the hanging groove is provided with hanging holes penetrating the left and right ends of the anchor brick body. By implementing the present invention, the following beneficial technical effects can be obtained: the hanging piece is connected to the hanging hole through the hooks on both sides, and the refractory anchor brick can be rotated relative to the hanging piece through the setting of the hanging groove, but the rotation is restricted by the hanging groove , making the refractory anchoring brick more convenient to use, improving the service life of the refractory anchoring brick and reducing the material of the anchoring brick; when the hanging piece rotates to the limit position, the hanging groove and the hook are close to each other, and the contact area is large, preventing the hanging piece and the refractory anchoring brick from being damaged.

Brick Anchor,Anchors For Coolers,Refractory Brick Anchors,316 Stainless Steel Refractory Anchor

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