Protection device for axially split pump shaft

Abstract

The protection device for the axially split pump shaft comprises a protection sleeve, a first sealing ring and a second sealing ring, the inner side of the protection sleeve is provided with an internal thread matched with a thread portion of the pump shaft, and the end, close to an impeller, of the protection sleeve is in sealing contact with the end face of the impeller through the first sealing ring. The inner side of the end, away from the impeller, of the protective sleeve is rotationally sealed with the pump shaft through a second sealing ring. The first sealing ring and the second sealing ring are arranged on the inner side and the end portion of the protective sleeve to seal and protect the threaded portion in threaded fit with the protective sleeve, so that incrustation is effectively prevented from permeating into the threaded portion and the end face of the impeller, and the service life of the pump shaft is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of split case pumps, in particular to a protection device for a pump shaft of a split case pump. Background Art

[0002] At present, the impeller of the split case pump is installed on the pump shaft, and is positioned radially by the driving key in the middle of the pump shaft and the keyway inside the impeller, and axially by the nut and the threaded part on the pump shaft on both sides of the driving key.

[0003] Since the nut and the matching threaded portion are in the medium for a long time, the medium can penetrate the nut and the end face of the impeller, causing the threaded portion of the pump shaft to be corroded and damaged by scale or other corrosive media, affecting the service life of the pump shaft. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies of the prior art, the utility model provides a protective device for a pump shaft of a split case pump, which seals and protects the threaded portion of the pump shaft and increases the service life of the pump shaft.

[0005] The technical solution of the utility model is: a protective device for a pump shaft of a split-center pump, comprising a protective sleeve, a first sealing ring and a second sealing ring. The inner side of the protective sleeve has an internal thread matched with the threaded portion of the pump shaft. The end of the protective sleeve close to the impeller is in sealing contact with the end face of the impeller through the first sealing ring, and the inner side of the end of the protective sleeve away from the impeller is rotationally sealed with the pump shaft through the second sealing ring. The protective sleeve mounted on the threaded portion seals and protects both ends of the protective sleeve through the first sealing ring and the second sealing ring, thereby effectively preventing scale from penetrating into the threaded portion and the end face of the impeller, and improving the life of the pump shaft.

[0006] The length of the protective sleeve is greater than the length of the threaded portion of the pump shaft.

[0007] An inner sealing groove for installing a first sealing ring and a second sealing ring is respectively provided on an end surface of the protective sleeve close to the impeller and an inner wall of an end of the protective sleeve away from the impeller.

[0008] A stop groove is provided on the outer side of one end of the protective sleeve close to the impeller, a stop washer is provided between the protective sleeve and the impeller, and both sides of the stop washer are in sealing contact with the end faces of the protective sleeve and the impeller through the first sealing ring and the third sealing ring respectively, the inner side of the stop washer has an inner tooth portion that matches the keyway of the impeller, and the outer side of the stop washer has an outer tooth portion that bends toward one side of the protective sleeve and matches the stop groove. The stop washer matches the protective sleeve and the impeller, thereby preventing the protective sleeve from rotating and improving the stability of the protective sleeve on the threaded portion of the pump shaft.

[0009] An outer sealing groove for installing a third sealing ring is provided on the end surface of the impeller.

[0010] The circumferential side wall of the protective sleeve is provided with a plurality of disassembly grooves, which facilitate disassembly of the protective sleeve when maintaining the impeller.

[0011] The beneficial effects of the utility model are as follows: the scheme provides a first sealing ring and a second sealing ring on the inner side and end of the protective sleeve, thereby providing double sealing protection for the threaded portion that cooperates with the thread of the protective sleeve, and the first sealing ring simultaneously forms a seal for the end face of the impeller, thereby effectively preventing scale from penetrating into the threaded portion and the end face of the impeller, thereby increasing the life of the pump shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 yes Figure 1 A partial enlarged view of middle A;

[0014] Figure 3 It is a schematic diagram of the connection between the stop washer and the protective sleeve in the utility model.

[0015] Figure numerals: 1, impeller; 101, keyway; 2, pump shaft; 201, threaded portion; 3, protective sleeve; 301, sealing groove; 302, stop groove; 303, disassembly groove; 4, first sealing ring; 5, second sealing ring; 6, stop washer; 601, inner thread portion; 602, outer thread portion; 7, third sealing ring. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution in the utility model, the technical solution in the utility model is clearly and completely described below in conjunction with the accompanying drawings. Other embodiments obtained by those skilled in the art without making any creative work should all fall within the protection scope of the utility model.

[0017] like Figure 1 and Figure 2 As shown, the utility model provides a protective device for a pump shaft of a split pump, comprising a protective sleeve 3, a first sealing ring 4 and a second sealing ring 5. The inner side of the protective sleeve 3 has an internal thread that matches the threaded portion 201 of the pump shaft 2. The end of the protective sleeve 3 close to the impeller 1 is in sealing contact with the end face of the impeller 1 through the first sealing ring 4, and the inner side of the end of the protective sleeve 3 away from the impeller 1 is rotationally sealed with the pump shaft 2 through the second sealing ring 5. In order to effectively protect the threaded portion 201, the length of the protective sleeve 3 is greater than the length of the threaded portion 201 of the pump shaft 2. The protective sleeve 3 is installed on both sides of the sleeve joint of the impeller 1 and the pump shaft 2, and the sealing protection of the two ends of the threaded portion 201 is completed by the first sealing ring 4 on the inner side of the protective sleeve 3 and the second sealing ring 5 at the end, and the first sealing ring 4 simultaneously forms a seal on the end face of the impeller 1, thereby effectively preventing scale from penetrating into the threaded portion 201 and the end face of the impeller 1, thereby improving the life of the pump shaft 2.

[0018] In order to facilitate the positioning of the sealing ring and ensure the sealing effect, the end surface of the protective sleeve 3 close to the impeller 1 and the inner wall of the end of the protective sleeve 3 away from the impeller 1 are respectively provided with inner sealing grooves 301 for installing the first sealing ring 4 and the second sealing ring 5.

[0019] like Figure 3 As shown, a stop groove 302 is provided on the outer side of one end of the protective sleeve 3 close to the impeller 1, a stop washer 6 is provided between the protective sleeve 3 and the impeller 1, and both sides of the stop washer 6 are in sealing contact with the end faces of the protective sleeve 3 and the impeller 1 through the first sealing ring 4 and the third sealing ring 7, respectively. Preferably, an outer sealing groove 301 for installing the third sealing ring 7 is provided on the end face of the impeller 1; the inner side of the stop washer 6 has an inner tooth portion 601 that matches the keyway 101 of the impeller 1, and the outer side of the stop washer 6 has an outer tooth portion 602 that bends toward one side of the protective sleeve 3 and matches the stop groove 302. The stop washer 6 matches the protective sleeve 3 and the impeller 1, thereby preventing the protective sleeve 3 from rotating and improving the stability of the protective sleeve 3 on the threaded portion 201 of the pump shaft 2.

[0020] In order to improve the convenience of disassembly when maintaining the impeller 1, a plurality of disassembly grooves 303 are provided on the circumferential side wall of the protective sleeve 3. The disassembly grooves 303 are circumferentially arranged on the outer side of the protective sleeve 3 to form a prism with a polygonal cross section.

[0021] When implementing this technical solution, the impeller 1 is sleeved on the middle part of the pump shaft 2, the protective sleeve 3 and the stop washer 6 are sleeved on the pump shaft 2 at both ends of the impeller 1 at the same time, the inner tooth portion 601 of the stop washer 6 is inserted into the keyway 101 of the impeller 1, the protective sleeve 3 is threadedly installed on the threaded portion 201, and the end of the protective sleeve 3 is pressed against the end face of the impeller 1 through the stop washer 6, and the three are in sealed contact through the third sealing ring 7 and the first sealing ring 4, the outer tooth portion 602 of the stop washer 6 is bent and folded into the stop groove 302, and the installation of the protective device on the pump shaft 2 is completed. When the impeller 1 needs to be maintained, the outer tooth portion 602 is bent outward to disengage it from the stop groove 302, and the protective sleeve 3 is disassembled by inserting a wrench into the disassembly groove 303.

Claims

1. A protective device for a split case pump shaft, characterized in that: It includes a protective sleeve, a stop washer, a first sealing ring, a second sealing ring and a third sealing ring. The inner side of the protective sleeve has an internal thread that matches the threaded portion of the pump shaft. The inner side of the end of the protective sleeve away from the impeller is rotatably sealed with the pump shaft via the second sealing ring. A stop groove is provided on the outer side of the end of the protective sleeve close to the impeller. A stop washer is provided between the protective sleeve and the impeller, and both sides of the stop washer are in sealing contact with the end faces of the protective sleeve and the impeller via the first sealing ring and the third sealing ring respectively. The inner side of the stop washer has an internal tooth portion that matches the keyway of the impeller, and the outer side of the stop washer has an external tooth portion that is bent toward one side of the protective sleeve and matches the stop groove.

2. The protective device for the pump shaft of a split case pump according to claim 1, characterized in that: The length of the protective sleeve is greater than the length of the threaded portion of the pump shaft.

3. The protective device for the pump shaft of a split case pump according to claim 2, characterized in that: An inner sealing groove for installing a first sealing ring and a second sealing ring is respectively provided on an end surface of the protective sleeve close to the impeller and an inner wall of an end of the protective sleeve away from the impeller.

4. The protective device for the pump shaft of a split case pump according to claim 3, characterized in that: An outer sealing groove for installing a third sealing ring is provided on the end surface of the impeller.

5. The protective device for a pump shaft of a split case pump according to any one of claims 1 to 3, characterized in that: The circumferential side wall of the protective sleeve is provided with a plurality of disassembly grooves.

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