Centrifugal sewage pump

Abstract

The centrifugal sewage pump comprises a pump shell, a volute, a pump shaft, an impeller, a wear-resisting plate, a stuffing box, a bearing box and a pump base, the volute is installed in the pump shell, a connecting groove is formed in the end of the pump shaft, a long-barrel hub is formed on the inner side of the impeller, a connecting step body is arranged on the inner side of the long-barrel hub, and a limiting protruding ring is formed at one end of the wear-resisting plate. The pump shaft is fixedly sleeved with a shaft sleeve and a shaft spacer, the shaft sleeve is located in the stuffing box, one end of the shaft spacer is located in the stuffing box, one end of the shaft spacer extends out of the stuffing box and is attached to one end of the long-barrel hub, and one end of the shaft sleeve is attached to one end of the shaft spacer; the front end of the shaft spacer and the front end of the shaft sleeve are fixedly connected with sealing rings, one side of the wear-resisting plate is sleeved outside the stuffing box, and a sealing ring is fixedly installed at the joint of the wear-resisting plate and the stuffing box. The sealing device has the advantages of being good in sealing performance and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model belongs to water pump technical field relates to a centrifugal sewage pump. BACKGROUND

[0002] The sewage pump is generally placed in sewage, the sewage pump in prior art, the impeller and the pump shaft are usually connected through the key, the solid particles in the sewage can enter the connecting part through the key groove gap, aggravate the wear and tear of the key and the key groove.

[0003] The utility model discloses a centrifugal sewage pump, including pump body, pump shaft, impeller, mechanical seal, front end cover, motor, back cover and control system, its characterized in that the distance between the outer end surface of the impeller in the impeller chamber of pump body and import is greater than the thickness of the hub of impeller, to make the gap between pump body and blade have big channel cavity, can pass through big diameter particle, the impeller is by the hub, impeller disc and two spiral blades, and the impeller disc is fixed at one end of the hub, and there are two spiral blades in circumferential array on the impeller disc, and the starting end of the spiral blade is fixedly connected with the hub, and the bottom is fixed on the impeller, and the spiral arc surface of the spiral blade is corresponded with the outer edge of the impeller disc after the spiral arc surface of the spiral blade is crossed three quadrants from the starting end along the surface of the impeller disc.

[0004] Although the centrifugal sewage pump provided by the patent guarantees that the object does not pass through the impeller flow channel, the impeller and the pump shaft are connected through the key, and the particles can still enter the gap between the impeller and the pump shaft, causing damage. UTILITY MODEL CONTENTS

[0005] The utility model discloses a centrifugal sewage pump to solve the above -mentioned problems in prior art.

[0006] The utility model discloses a centrifugal sewage pump, including pump shell, volute, pump shaft, impeller, wear plate, stuffing box, bearing box and pump base, the volute is installed in the inside of pump shell, the pump shaft is in proper order through the bearing box, stuffing box, wear plate, volute and impeller, the pump shaft end is provided with connecting groove, the inside of the long barrel hub is formed with the connecting stage body, the one end of wear plate forms the limit convex ring, the long barrel hub is in the inside of limit convex ring, the sleeve of pump shaft is fixed with the shaft spacer, the shaft sleeve is located in the inside of stuffing box, the one end of shaft spacer is located in the inside of stuffing box, the one end of shaft spacer is out of stuffing box and is pasted with the one end of long barrel hub, the one end of shaft sleeve is pasted with the one end of shaft spacer, the front end of shaft spacer and the front end of shaft sleeve are fixedly connected with the sealing ring, and the wear plate one side is set up in the outside of stuffing box and is fixedly installed with the sealing ring at the wear plate and stuffing box junction.

[0007] In the centrifugal sewage pump, the volute is provided with an open structure on one side, and the wear plate is fixedly connected to the one side of the volute.

[0008] In the centrifugal sewage pump, the pump base is arranged below the bearing box, and the pump base is provided with mounting bodies on both sides thereof, and the pump shell is provided with a mounting ring on the rear side thereof, and the mounting bodies are fixed to the mounting ring.

[0009] In the centrifugal sewage pump, the packing box is fixedly provided with a gland on one side, the bearing box is fixedly provided with a labyrinth seal on one side, and the end faces of the gland and the labyrinth seal are tightly sealed.

[0010] Compared with the prior art, the centrifugal sewage pump has the following beneficial effects: 1. The long barrel hub of the impeller extends into the limiting convex ring of the wear plate, which precisely positions the impeller in the axial direction and reduces the gap between the impeller and the wear plate, thereby reducing the possibility of liquid leakage from the side of the impeller, especially for sewage containing particles, which can reduce the risk of particles entering the sealing gap and causing wear; 2. One end of the shaft spacer is tightly fitted with the long barrel hub, and the other end is tightly fitted with the shaft sleeve, thereby reducing the flow space of liquid between the pump shaft, the impeller and the packing box, and further enhancing the sealing effect of the sealing ring through close mechanical cooperation. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 is a schematic diagram of the overall structure of the utility model;

[0012] Fig. 2 is a schematic diagram of the explosion structure of the utility model;

[0013] Fig. 3 is a schematic diagram of the cross-sectional structure of the utility model.

[0014] In the figure: 1, pump shell; 110, mounting ring; 2, volute; 3, pump shaft; 31, connecting groove; 4, impeller; 41, long barrel hub; 42, connecting step body; 5, wear plate; 51, limiting convex ring; 6, packing box; 7, bearing box; 8, pump base; 81, mounting body; 9, shaft sleeve; 10, shaft spacer; 11, sealing ring; 12, sealing ring; 13, gland; 14, labyrinth seal. DETAILED DESCRIPTION

[0015] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0016] As Figs. 1-3As shown, the embodiment includes a pump shell 1, a volute 2, a pump shaft 3, an impeller 4, a wear plate 5, a stuffing box 6, a bearing box 7 and a pump base 8, the volute 2 is installed inside the pump shell 1, the pump shaft 3 is sequentially provided through the bearing box 7, the stuffing box 6, the wear plate 5, the volute 2 and the impeller 4, one side of the volute 2 is of an open structure, the wear plate 5 is fixedly connected with one side of the volute 2, so as to ensure the structural stability and reliable sealing, the pump shaft 3 is provided with a connecting groove 31 at an end thereof, the inside of the impeller 4 is formed with a long barrel hub 41, the inside of the long barrel hub 41 is provided with a connecting step body 42, the connecting groove 31 and the connecting step body 42 are fixedly connected when the impeller 4 and the pump shaft 3 are connected, one end of the wear plate 5 is formed with a limiting convex ring 51, the long barrel hub 41 extends into the inside of the limiting convex ring 51, the limiting convex ring 51 plays a role of positioning the long barrel hub 41 and reduces the gap between the impeller 4 and the wear plate 5, so as to strengthen the sealing property and the installation precision.

[0017] As shown, Figs. 1-3 the shaft sleeve 9 is located inside the stuffing box 6, the shaft spacer 10 is located inside the stuffing box 6 at one end and extends out of the stuffing box 6 at the other end and is attached to one end of the long barrel hub 41, the shaft sleeve 9 is attached to one end of the shaft spacer 10, the front end of the shaft spacer 10 and the front end of the shaft sleeve 9 are fixedly connected with a sealing ring 11, the sealing ring 11 ensures the sealing property between the shaft sleeve 9 and the shaft spacer 10, the wear plate 5 is sleeved outside the stuffing box 6 at one side and is fixedly installed with a sealing ring 12 at the connection between the wear plate 5 and the stuffing box 6, the sealing ring 12 ensures the sealing property between the wear plate 5 and the stuffing box 6.

[0018] Further, as shown, Figs. 1-3 the pump base 8 is installed below the bearing box 7, the pump base 8 is formed with an installation body 81 at both sides, the pump shell 1 is formed with an installation ring 110 at the rear side, the installation body 81 is fixedly connected with the installation ring 110, so as to firmly install the whole pump body.

[0019] Further, as shown, Figs. 1-3 one side of the stuffing box 6 is fixedly connected with a gland 13, one side of the bearing box 7 is fixedly connected with a labyrinth seal 14, the end faces of the gland 13 and the labyrinth seal 14 are attached to each other, so as to strengthen the sealing effect, prevent impurities and liquid from entering the bearing box 7, protect the internal components from being abraded and corroded, and ensure the stable operation of the pump.

[0020] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0021] Although various terms are used herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the present application; any interpretation of them as any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A centrifugal sewage pump, comprising a pump casing (1), a volute (2), a pump shaft (3), an impeller (4), a wear-resistant plate (5), a stuffing box (6), a bearing housing (7), and a pump base (8), wherein the volute (2) is installed inside the pump casing (1), and the pump shaft (3) passes sequentially through the bearing housing (7), the stuffing box (6), the wear-resistant plate (5), the volute (2), and the impeller (4), characterized in that: A connecting groove (31) is provided at the end of the pump shaft (3). A long cylindrical hub (41) is formed inside the impeller (4). A connecting step (42) is provided inside the long cylindrical hub (41). A limiting protrusion (51) is formed at one end of the wear-resistant plate (5). The long cylindrical hub (41) extends into the limiting protrusion (51). A shaft sleeve (9) and a shaft spacer (10) are fitted and fixed on the pump shaft (3). The shaft sleeve (9) is located inside the stuffing box (6). The shaft spacer... One end of the device (10) is located inside the stuffing box (6). One end of the shaft spacer (10) extends out of the stuffing box (6) and is in contact with one end of the long cylindrical hub (41). One end of the bushing (9) is in contact with one end of the shaft spacer (10). A sealing ring (11) is fixedly connected to the front end of the shaft spacer (10) and the front end of the bushing (9). One side of the wear-resistant plate (5) is sleeved outside the stuffing box (6), and a sealing ring (12) is fixedly installed at the connection between the wear-resistant plate (5) and the stuffing box (6).

2. A centrifugal sewage pump according to claim 1, characterized in that: The volute (2) has an open structure on one side and the wear-resistant plate (5) is fixedly connected to one side of the volute (2).

3. A centrifugal sewage pump according to claim 1, characterized in that: The pump base (8) is installed below the bearing housing (7). Mounting bodies (81) are formed on both sides of the pump base (8). A mounting ring (110) is formed on the rear side of the pump housing (1). The mounting bodies (81) are fixed to the mounting ring (110).

4. A centrifugal sewage pump according to claim 1, characterized in that: A pressure cap (13) is fixed on one side of the stuffing box (6), and a labyrinth seal (14) is fixed on one side of the bearing box (7). The pressure cap (13) and the end face seal of the labyrinth are in contact.

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