Slurry pump sealing structure with auxiliary impeller and mechanical seal working together

Abstract

The utility model provides a slurry pump sealing structure with an auxiliary impeller and a mechanical seal working together. The slurry pump sealing structure comprises the auxiliary impeller, a mechanical sealing box and the mechanical seal. Wherein the main sealing piece comprises an auxiliary impeller and a mechanical seal, the auxiliary impeller is mainly used for resisting axial force and reducing the pressure of the sealing piece and sealing a pump cavity during operation, and the mechanical sealing box is mainly used for achieving a certain sealing effect when the auxiliary impeller is contained, reducing a shaft hole radial opening of a pump body and enabling the shaft hole radial opening to be provided with an external flushing type mechanical seal in a matched mode. The mechanical seal is mainly used for sealing the outermost layer of the shaft and sealing a pump cavity during shutdown, and slurry leakage is prevented. The slurry pump sealing structure with the auxiliary impeller and the mechanical seal working together can generate a good sealing effect on the pump cavity no matter in the pump operation process or in the shutdown state. The external flushing type mechanical sealing device is simple in structure, small in size, convenient to install, complete in function, good in sealing effect and wide in application range.

Description

Technical Field

[0001] This utility model belongs to the field of slurry pump cavity shaft end sealing technology, specifically relating to a slurry pump sealing structure in which a secondary impeller and a mechanical seal work together. Background Technology

[0002] During operation, the impeller of the slurry pump is impacted by the water flow, generating a large axial force. At the same time, the packing seal structure of the foundation requires high-pressure shaft seal water, and water enters the pump cavity, resulting in significant water consumption. Although the auxiliary impeller seal does not require sealing water, it cannot completely seal the pump cavity when the pump is stopped, leading to slurry leakage. Furthermore, the auxiliary impeller structure cannot completely solve the dripping problem. High-pressure mud enters the sealing surface of the mechanical seal, easily causing wear of the dynamic and static rings, resulting in mechanical seal failure. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, in order to solve the problems existing in the prior art, this utility model aims to provide a slurry pump sealing structure that does not leak water whether the slurry pump is stopped or running, and can effectively seal the pump cavity. Specifically, it is a slurry pump sealing structure design in which an auxiliary impeller and a mechanical seal work together.

[0004] Its main technical solution is: a slurry pump sealing structure that works together with an auxiliary impeller and a mechanical seal, including a pump shaft, a pump body and an impeller installed at the end of the pump shaft. The pump shaft is fitted with a bushing, and a mechanical seal is fitted over the bushing. The mechanical seal is bolted to a mechanical seal housing, and the mechanical seal housing abuts against the inner side of the pump body. An auxiliary impeller is provided between the bushing and the impeller on the pump shaft.

[0005] Furthermore, sealing gaskets are provided at both ends of the bushing, and a sealing gasket passes between the auxiliary impeller and the impeller.

[0006] Furthermore, a rear guard plate is installed on the inside of the pump body, and the rear guard plate is located between the auxiliary impeller and the impeller.

[0007] Furthermore, the diameter of the shaft hole of the mechanical seal box is larger than the diameter of the pump shaft.

[0008] The beneficial effect of this utility model is that it can produce a good sealing effect on the pump cavity whether the pump is running or stopped.

[0009] The motor transmits high speed to the impeller via a coupling, and the impeller drives the slurry to move. The slurry pushes the impeller and the motor end to move axially, putting pressure on the bearings and greatly shortening their service life. Now, an auxiliary impeller has been added after the impeller. During operation, it can seal the pump chamber and also greatly reduce the axial force, extending the service life of the bearings.

[0010] Mechanical seals offer excellent sealing performance, replacing traditional packing seals and avoiding the constant dripping at the split packing gland. Furthermore, the use of externally flushed mechanical seals further reduces contact between the mechanical seal and the slurry, saving water resources. While extending service life and being water-saving and environmentally friendly, it also expands the types of slurries that can be used, enabling its application in more industries.

[0011] Compared with traditional packing seals, impeller seals, and mechanical seals, this slurry pump sealing structure has advantages such as no pump cavity leakage, good sealing effect, long bearing service life, and wide application range, thanks to the combined action of the impeller and mechanical seal. Attached Figure Description

[0012] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the overall structure of the slurry pump of this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the mechanical seal portion of this utility model;

[0015] The components are: 1. Mechanical seal; 2. Mechanical seal housing; 3. Auxiliary impeller; 4. Pump body; 5. Rear guard plate; 6. Impeller; 7. Shaft sleeve. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] A slurry pump sealing structure that combines an auxiliary impeller and a mechanical seal includes a mechanical seal 1, wherein the mechanical seal 1 is an external flushing type and is connected to a mechanical seal housing 2 by bolts to isolate the pump cavity from the environment.

[0019] Mechanical seal box 2: This mechanical seal box 2 is dedicated to the mechanical seal 1 and provides support for the mechanical seal 1. At the same time, in order to facilitate the shaft seal water flushing of the mechanical seal 1, the installation positions of materials such as packing pads, packing, and water seal rings in the traditional packing seal method are removed from the inside of the mechanical seal box 2, and the shaft hole is changed to a large through hole to prevent the external flushing mechanical seal from being blocked by flushing water.

[0020] The auxiliary impeller 3 is mounted on the pump shaft and fixed at both ends against the shaft sleeve 7 and the impeller 6 respectively. During operation, it rotates together with the shaft to reduce the pressure of the slurry on the mechanical seal box 2, thus sealing the cavity. At the same time, it reduces the axial pressure on the bearing, reduces the amount of particulate matter in the slurry that approaches the mechanical seal 1, and protects the mechanical seal 1.

[0021] The mechanical seal 1 is installed outside the pump chamber and has a simple structure, small size, convenient installation, complete functions, and high practicality. Together with the auxiliary impeller, it ensures that the pump chamber does not leak slurry whether it is running or stopped.

[0022] The main sealing components are the auxiliary impeller 3 and the mechanical seal 1. The auxiliary impeller 3 is mainly used to resist axial force and reduce the pressure on the seal during operation to seal the pump cavity. The main function of the mechanical seal box 2 is to provide a certain sealing effect when accommodating the auxiliary impeller 3, reduce the radial opening of the shaft hole of the pump body 4, and adapt it to the installation of the external flushing mechanical seal 1. The mechanical seal 1 mainly plays the role of sealing the outermost layer of the shaft, and sealing the pump cavity when the machine is stopped to prevent slurry leakage.

[0023] Example:

[0024] A sealing structure for a slurry pump that combines an auxiliary impeller and a mechanical seal includes a mechanical seal 1, a mechanical seal housing 2, and an auxiliary impeller 3. The specific installation steps are as follows:

[0025] I. Assemble the other components of the pump according to the assembly requirements in the assembly drawing;

[0026] II. Insert the shaft sleeve 7 onto the pump shaft of the assembly assembled in step I, with sealing gaskets at both ends of the shaft sleeve;

[0027] III. Secure the pump body 4 to the bracket using double-ended studs;

[0028] IV. Connect the mechanical seal 1 to the mechanical seal housing 2 using bolts;

[0029] V. Insert the component control assembly made in step IV onto the bushing 7 and press it against the pump body 4;

[0030] VI. Insert the auxiliary impeller 3 onto the shaft and press it against the shaft sleeve 7, then fix the rear guard plate 5 onto the pump body 4. Finally, insert the impeller 6 onto the shaft, with a sealing gasket between the impeller 6 and the auxiliary impeller 3. Assemble other pump components according to the normal assembly process.

[0031] The usage steps are as follows:

[0032] Ⅰ. After assembling the pump according to the assembly requirements, fill the pump chamber with water. When the liquid level is above the mechanical seal, the mechanical seal provides a seal for the pump body in the stopped state to protect the pump chamber from leakage.

[0033] II. Provide energy to the drive unit so that the pump shaft drives the impeller and auxiliary impeller to start rotating. The auxiliary impeller counteracts the axial force generated by the impeller and also prevents the slurry pump fluid medium from approaching the external flushing mechanical seal, thus reducing the pressure of the flushing water.

[0034] III. During pump operation, the dynamic ring of the mechanical seal rotates synchronously, and a liquid film is formed under the action of the stationary ring and flushing water, which reduces the frictional resistance between the dynamic and stationary rings, extends the service life of the mechanical seal, and reduces the possibility of leakage;

[0035] IV. With the combined action of the auxiliary impeller and the mechanical seal, the auxiliary impeller plays the main sealing role when the pump is running, and the mechanical seal plays the main sealing role when the pump is stopped. This effectively protects the pump cavity from slurry leakage and improves the working environment of the pump.

[0036] The slurry pump sealing structure, which combines an impeller and a mechanical seal, reduces bearing wear, extends the pump's service life, greatly improves the pump cavity sealing structure, and broadens the pump's application range.

[0037] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A slurry pump sealing structure that combines an auxiliary impeller and a mechanical seal, comprising a pump shaft, a pump body (4), and an impeller (6) mounted at the end of the pump shaft, characterized in that: The pump shaft sleeve is provided with a shaft sleeve (7), and a mechanical seal (1) is provided on the outer sleeve (7). The mechanical seal (1) is connected to the mechanical seal box (2) by bolts, and the mechanical seal box abuts against the inner side of the pump body (4). An auxiliary impeller (3) is provided between the shaft sleeve (7) and the impeller (6) on the pump shaft.

2. The slurry pump sealing structure that combines the auxiliary impeller and the mechanical seal according to claim 1, characterized in that: The bushing (7) is provided with sealing gaskets at both ends, and the auxiliary impeller (3) and the impeller (6) are connected by a sealing gasket.

3. The slurry pump sealing structure that combines the auxiliary impeller and the mechanical seal according to claim 1, characterized in that: The pump body (4) is equipped with a rear guard plate (5) on its inner side, and the rear guard plate (5) is located between the auxiliary impeller (3) and the impeller (6).

4. The slurry pump sealing structure that combines the auxiliary impeller and the mechanical seal according to claim 1, characterized in that: The diameter of the shaft hole of the mechanical seal box (2) is larger than the diameter of the pump shaft.

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