Multi-stage centrifugal pump capable of exhausting air automatically

Abstract

The utility model discloses an automatic exhaust multi-stage centrifugal pump, and relates to the technical field of centrifugal pumps. Comprising a pump body, a plurality of horizontally arranged impellers, a plurality of guide vanes, a liquid discharge pipe, a liquid inlet pipe, a coupler and a motor, an exhaust hole A is formed in the upper portion of each impeller of the pump body, and an automatic exhaust valve is installed on the upper portion of each exhaust hole A of the pump body. The automatic exhaust pump has the advantages that the exhaust hole A is formed in the upper portion of the impeller of the pump body, the automatic exhaust valve is installed on the upper portion of the exhaust hole A of the pump body, when gas is gathered at the exhaust hole, the buoy descends, the gas is automatically exhausted, and influence of gas resistance on operation of the pump is avoided; and gas contained in the liquid is discharged before entering the pump, so that the harmfulness of gas resistance is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal pump technical field especially, relates to a multistage centrifugal pump of automatic exhaust. BACKGROUND

[0002] Centrifugal pumps are widely used in various industries, when liquid containing gas enters the impeller, it needs to be discharged in time, otherwise the pump will be idling, the general centrifugal pump is provided with exhaust plug, but for horizontal multistage centrifugal pump, it is multiple horizontally arranged impellers and the spacer vane structure, when gas enters a certain impeller, it will cause gas resistance, and the operator cannot intuitively judge it. UTILITY MODEL CONTENTS

[0003] In order to solve the problem that the gas resistance of horizontal multistage centrifugal pump cannot be found and discharged in time, the utility model provides a multistage centrifugal pump of automatic exhaust.

[0004] The utility model discloses a technical scheme: a multistage centrifugal pump of automatic exhaust, including pump body, a plurality of horizontally arranged impellers, a plurality of guide vanes, liquid discharge pipe, liquid inlet pipe, pump shaft, coupling and motor and horizontal multistage centrifugal pump, the pump body is opened exhaust hole A on each impeller top, and the pump body is installed with automatic exhaust valve on the top of exhaust hole A;

[0005] Automatic exhaust valve includes gland, and the gland is fixedly connected with pump body through sealing ring and bolt, and the gland is installed with float in, and the gland is threadedly connected with the limiting ring below the float, and the outer dimension of the float is greater than the inner hole of the limiting ring, and the upper portion of the float is equipped with valve core, and the upper portion of the valve core is conical tip structure, and the gland is opened with through -hole, and the conical tip of the valve core is inserted into the through -hole and sealed, and the valve core is equipped with guide sleeve on the outside, and the guide sleeve is connected with the valve core gap, and the guide sleeve is fixedly connected with the gland.

[0006] The pump body is opened with annular liquid inlet chamber in the frontmost impeller position, and the annular liquid inlet chamber is communicated with the liquid inlet of the impeller, and the liquid inlet pipe is horizontally arranged, and the liquid inlet pipe is located above the center line of the annular liquid inlet chamber, and the channel of the liquid inlet pipe is inserted into the pump body and communicated with the annular liquid inlet chamber, and the annular liquid inlet chamber is opened with exhaust hole B on the top, and the pump body is installed with automatic exhaust valve on the top of the exhaust hole B of the annular liquid inlet chamber, and the automatic exhaust valve is consistent with the automatic exhaust valve structure of the impeller position.

[0007] The gland is installed with filter screen on the top of the limiting ring.

[0008] The utility model has the advantages that: through the pump body is opened with exhaust hole A on the top of the impeller, and the pump body is installed with automatic exhaust valve on the top of the exhaust hole A, when gas gathers in the exhaust hole position, the float drops, and the gas is discharged automatically, which avoids the influence of gas resistance on the operation of the pump, and the automatic exhaust valve is arranged at the liquid inlet pipe position, and the gas contained in the liquid is discharged before entering the pump, which reduces the harmfulness of gas resistance. Attached Figure Description

[0009] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Appendix Figure 2 Appendix Figure 1 AA cross-section view.

[0011] In the diagram, 1-pump body, 2-impeller, 3-guide vane, 4-pump shaft, 5-coupling, 6-motor, 7-drain pipe, 8-inlet pipe, 9-annular inlet chamber, 10-vent hole A, 11-pressure cover, 12-float, 13-filter screen, 14-limiting ring, 15-guide sleeve, 16-valve core, 17-through hole, 18-vent hole B. Detailed Implementation

[0012] The following explanation uses a vertical multistage centrifugal pump as an example:

[0013] like Figures 1-2 As shown, an automatic venting multistage centrifugal pump includes a pump body 1, several horizontally arranged impellers 2, several guide vanes 3, a discharge pipe 7, an inlet pipe 8, a pump shaft 4, a coupling 5, and a motor 6. The pump body 1 has a vent hole A10 on the upper part of each impeller 2, and an automatic venting valve is installed on the upper part of the vent hole A10 of the pump body 1.

[0014] The automatic exhaust valve includes a pressure cover 11, which is fixedly connected to the pump body 1 by a sealing ring and bolts. A float 12 is installed inside the pressure cover 11. A limiting ring 14 is threadedly connected to the lower part of the float 12. The outer dimensions of the float 12 are larger than the inner hole of the limiting ring 14 to prevent the float 12 from falling off. A valve core 16 is provided on the upper part of the float 12. The upper part of the valve core 16 has a conical tip structure. A through hole 17 is opened on the pressure cover 11. The conical tip of the valve core 16 extends into the through hole 17 for sealing. A guide sleeve 15 is fitted on the outside of the valve core 16. The guide sleeve 15 is connected to the valve core 16 with a clearance fit. The guide sleeve 15 is fixedly connected to the pressure cover 11.

[0015] The pump body 1 has an annular inlet chamber 9 at the front impeller 2. The annular inlet chamber 9 is connected to the inlet of the impeller 2. The inlet pipe 8 is arranged horizontally and is located above the center line of the annular inlet chamber 9. The channel of the inlet pipe 8 extends into the pump body 1 and is connected to the annular inlet chamber 9. The annular inlet chamber 9 has an exhaust port B18 at the top. The pump body 1 is equipped with an automatic exhaust valve at the exhaust port B18 of the annular inlet chamber 9. The automatic exhaust valve has the same structure as the automatic exhaust valve at the impeller 2.

[0016] The pump body 1 is provided with a vent hole A10 on the upper part of the impeller 2, and an automatic vent valve is installed on the upper part of the vent hole A10. When gas gathers at the vent hole A10, the float 12 will descend, the valve core 16 will leave the through hole 17, and the gas will be automatically discharged, avoiding the influence of gas resistance on the operation of the pump. At the same time, an automatic vent valve is arranged at the inlet pipe 8, and the gas contained in the liquid is discharged before entering the pump, reducing the harmfulness of gas resistance.

[0017] The cover 11 is provided with a filter screen 13 on the upper part of the limiting ring 14 to prevent impurities from entering and sticking the float 12.

Claims

1. A multistage centrifugal pump with automatic venting, comprising a pump body (1), several horizontally arranged impellers (2), several guide vanes (3), a discharge pipe (7), an inlet pipe (8), a pump shaft (4), a coupling (5), and a motor (6), characterized in that: The pump body (1) has an exhaust port A (10) on the upper part of each impeller (2), and an automatic exhaust valve is installed on the upper part of the exhaust port A (10) of the pump body (1); The automatic exhaust valve includes a pressure cover (11), which is fixedly connected to the pump body (1) by a sealing ring and bolts. A float (12) is installed inside the pressure cover (11). A limiting ring (14) is threadedly connected to the lower part of the float (12) of the pressure cover (11). The outer dimensions of the float (12) are larger than the inner hole of the limiting ring (14). A valve core (16) is provided on the upper part of the float (12). The upper part of the valve core (16) has a conical tip structure. A through hole (17) is opened on the pressure cover (11). The conical tip of the valve core (16) extends into the through hole (17) for sealing. A guide sleeve (15) is fitted on the outside of the valve core (16). The guide sleeve (15) is connected to the valve core (16) with a clearance fit. The guide sleeve (15) is fixedly connected to the pressure cover (11).

2. The multi-stage centrifugal pump with automatic exhaust as described in claim 1, characterized in that: The pump body (1) has an annular inlet chamber (9) at the front impeller (2) and the annular inlet chamber (9) is connected to the inlet of the impeller (2). The inlet pipe (8) is arranged horizontally and is located above the center line of the annular inlet chamber (9). The channel of the inlet pipe (8) extends into the pump body (1) and is connected to the annular inlet chamber (9). The annular inlet chamber (9) has an exhaust hole B (18) at the top. The pump body (1) is equipped with an automatic exhaust valve at the top of the exhaust hole B (18) of the annular inlet chamber (9). The automatic exhaust valve has the same structure as the automatic exhaust valve at the impeller (2).

3. The multi-stage centrifugal pump with automatic exhaust as described in claim 1, characterized in that: A filter screen (13) is installed on the upper part of the pressure cap (11) and the limiting ring (14).

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