This paper mainly explains the type, structure, and model of ZJ slurry pumps. There are two types of ZJ slurry pumps.
One is the ZJ type, which is a horizontal shaft single-stage single-suction centrifugal slurry pump; The other is the ZJL type, which is a vertical shaft single-stage single-suction centrifugal slurry pump.
Ⅰ. Structural characteristics and model of ZJ slurry pumps
1. Structural characteristics of ZJ slurry pumps
1) Pump End
The pump head of the ZJ slurry pump includes a pump shell, impeller, and shaft seal device. The pump head is connected with the base with bolts. As required, the water outlet position of the pump can be installed and used by rotating eight different angles at an interval of 45 °.
The pump shell of the ZJ slurry pump is a double-layer shell structure. The outer layer is metal pump casing (front pump casing and rear pump casing), and its material is usually cast iron or ductile iron; the inner layer is made of high chromium alloy cast iron (including volute, throat bush, and frame plate liner insert).
The impeller is composed of a front cover plate, rear cover plate, blade, and back blade. The blades are twisted, usually in the quantity of 3-6. The back blades are distributed on the outside of the front cover plate and the rear cover plate, usually in the quantity of 8. The impeller is made of high chromium alloy cast iron, and the impeller is connected with the shaft by a thread.
The shaft seal device has three types: expeller + packing combined seal, packing seal, and mechanical seal.
The combined seal type of expeller and packing consists of the stuffing box, expeller, lantern ring, packing, gland, and shaft sleeve.
The packing seal type is composed of the stuffing box, shaft spacer, lantern ring, packing, gland, and shaft sleeve.
The mechanical seal type consists of a stuffing box, shaft spacer, mechanical seal, gland, and shaft sleeve.
2) Pump Base
The pump base has two structures: horizontal split type and barrel type.
The split base is lubricated with thin oil, which is mainly composed of the base body, base cover, shaft, bearing box, bearing, bearing gland, retaining sleeve, nut, oil seal, water retaining plate, release collar, and other parts, as shown in Figure 1. 150ZJ and above pumps are also equipped with water cooling device.
The cylindrical base is lubricated with grease, which is mainly composed of the base body, bearing body, shaft, bearing, bearing top sleeve, bearing gland, oil seal, oil cup, water retaining plate, release collar, and other parts.
The barrel base is only applicable to pump types with small power of 200ZJ and below. At present, there are only three specifications: T200ZJ-A70, T200ZJ-A60, and T150ZJ-A60.
See Figure 1 for the specific structure of the ZJ pump.
Ⅱ. Structural characteristics and model of ZJL slurry pumps
1. Structural characteristics of ZJL slurry pumps
ZJL slurry pump is mainly composed of impeller, volute, rear guard plate, shaft sleeve, support, support plate, shaft, bearing, bearing body and other parts.
The impeller, volute, and rear guard plate are made of high chromium alloy cast iron. The impeller and shaft are connected by threads, and the volute, support and bearing body are connected by bolts. The pump shaft and motor can be driven directly by coupling or belt.
The bearing of the ZJL pump is lubricated with grease. This series of pumps are nonshaft seal pumps.
See Figure 2 for the specific structure of the ZJL pump.