Energy-saving horizontal direct-connected single-stage double-suction centrifugal pump

Abstract

The invention relates to an energy-saving horizontal double-suction centrifugal pump, which includes a pump body, a pump cover, an impeller and a motor. The connection between the motor side cover and the pump cover II is fixed, and there is an open air isolation gap or a cooling water isolation cavity between the two. The motor shaft passes through the pump cover II and enters the pump body, and the impeller corresponds to the center of the vortex chamber in the middle. Installed on the motor shaft, there is a bellows type dynamic seal between the impeller and the pump cover II, the suction vortex chamber on both sides of the pump body and the discharge vortex chamber in the middle are matched with the partition wall integrated with the pump body and the partition wall by using a spigot The left and right annular partitions are separated together, the center line of the left and right annular partitions coincides with the axis of the motor, and the left and right annular partitions and the corresponding side pump cover respectively use the connecting ribs to form an integrated structure. The outer diameters of the left and right annular partition plates are greater than the maximum diameter of the impeller. It is energy-saving and high-efficiency, and at the same time, it is convenient for repair and maintenance, and significantly improves work efficiency.

Description

technical field [0001] The invention relates to an energy-saving horizontal direct-connected single-stage double-suction centrifugal pump. Background technique [0002] The existing horizontal double-suction centrifugal pump is composed of pump body, pump cover, impeller shaft, impeller, motor, coupling, bearing, packing and other parts, which has the following problems: 1. The motor shaft and The impeller shafts are connected, relying on the coupling to transmit power, and the reactive power loss is large. At the same time, the double-suction centrifugal pump occupies a large area, and the mechanical transmission brings large noise and vibration, which affects the stability of the centrifugal pump operation and the mechanical failure rate. Higher; 2. Double-suction centrifugal pump pumping high-temperature liquid or working for a long time will easily cause the temperature of the motor and motor bearings to rise. In order to prevent damage to the motor, it usually needs to ...

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Problems solved by technology

[0002] The existing horizontal double-suction centrifugal pump is composed of pump body, pump cover, impeller shaft, impeller, motor, coupling, bearing, packing and other parts, which has the following problems: 1. The motor shaft and The impeller shafts are connected, relying on the coupling to transmit power, and the reactive power loss is large. At the same time, the double-suction centrifugal pump occupies a large area, and the mechanical transmission brings large noise and vibration, which affects the stability of the centrifugal pump operation and the mechanical failure rate. Higher; 2. Double-suction centrifugal pump pumping high-temperature liquid or working for a long time will easily cause the temperature of the motor and motor bearings to rise. In order to prevent damage to the motor, it usually needs to be shut down intermittently to cool down, which seriously affects the performance of the motor and production efficiency. ; 3. The coupling must be covered with a casing during operation to prevent the fasteners from being thrown out and hurting people. At the same time, the buffer rubber blocks are constantly squeezed and rubbed to produce odors and damage human health.

[0003] At present, in order to reduce the reactive power loss of centrifugal pumps, some centrifugal pumps adopt the method of direct connection without transition, that is, the motor shaft is extended and extended into the pump body to replace the impeller shaft, and the coupling is omitted, but this structure is only realized in single-stage It is not suitable for single-suction centrifugal pumps to be applied to double-suction centrifugal pumps. The reason is that it is limited by the internal structure of existing double-suction centrifugal pumps. The internal space formed by the pump body and pump cover of existing double-suction centrifugal pumps The partition wall is used to divide the suction vortex chamber on both sides and the discharge vortex chamber in the middle. The impeller is installed in the discharge vortex chamber in the middle and a double-suction sealing ring is installed between the partition wall. If the direct connection is adopted, the pump body and pump cover must use The upper and lower split structures, which lead to the fact that when the rotor part (impeller, etc.) in the pump is damaged, the pump cover must be opened and lifted first, then the motor and the rotor part are lifted together, and finally the lower impeller is removed from the motor shaft in turn The inspection, replacement or maintenance of positioning parts, impellers, seals, bearings and other components is cumbersome and complicated, and because the motor needs to be lifted together, it is time-consuming and laborious, which seriously affects work efficiency

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