Device for mounting rear protection plate of slurry pump

Abstract

The utility model relates to the technical field of slurry pumps, and discloses a device for mounting a rear protection plate of a slurry pump and a mounting process. The device comprises an extension shaft body, the extension shaft body is of a tubular structure and is connected to a pump shaft of the slurry pump in a sleeving mode, the length of the extension shaft body is larger than the thickness of a rear protection plate of the slurry pump so that the extension shaft body can protrude out of the rear protection plate, the extension shaft body is used for enabling the rear protection plate of the slurry pump to slide in through the extension shaft body, and connection of the rear protection plate and a pump shell is completed. According to the scheme, the pump shaft is lengthened through the lengthened shaft body, so that the rear protection plate of the slurry pump slides into the pump shaft through the lengthened shaft body, the sealing ring and the sealing gasket are prevented from falling off and shifting easily in the alignment process, and due to the fact that the length of the lengthened shaft body is larger than the thickness of the rear protection plate of the slurry pump, the service life of the pump shaft is prolonged. The inner wall of a hole of the rear protection plate of the slurry pump is in contact with the outer wall of the extension shaft body in the installation process, and the risk that the rear protection plate of the slurry pump falls off in the installation process is avoided.

Description

Technical Field

[0001] This utility model relates to the field of slurry pump technology, specifically to a device and installation process for installing a rear guard plate of a slurry pump. Background Technology

[0002] Slurry pumps are commonly used equipment in various industries. A key characteristic of these pumps is the need for regular replacement of their flow-through components. The maintenance and replacement of metal flow-through components in slurry pumps is particularly challenging. These components mainly consist of a front guard plate, a rear guard plate, and a sleeve. The rear guard plate is fixed to the pump casing with four bolts, and a static seal is achieved with a sealing ring and gasket to prevent slurry leakage. During installation, the length of the protruding pump casing exceeds the length of the pump shaft, making rear guard plate installation difficult. Furthermore, the rear guard plate is heavy, making manual handling and installation laborious and dangerous, typically requiring hoisting. However, the rear guard plate lacks lugs, making it difficult to remove steel ropes during hoisting. After the rear guard plate's shaft hole is inserted into the pump shaft, its position must be manually moved to align with the bolt holes. This alignment process can easily cause the sealing ring and gasket to detach or shift, leading to rework and a risk of the rear guard plate falling off during the process.

[0003] Therefore, how to safely and effectively complete the installation of the back plate of the slurry pump is an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present invention provides a device and installation process for installing the rear guard plate of a slurry pump, so as to solve the technical problem that the rear guard plate of a slurry pump is not easy to install.

[0005] In a first aspect, this utility model provides a device for installing a rear guard plate of a slurry pump. The device includes: an extension shaft, which is a tubular structure and is sleeved on the pump shaft of the slurry pump. The length of the extension shaft is greater than the thickness of the rear guard plate of the slurry pump, so that the extension shaft protrudes from the rear guard plate. The extension shaft is used to allow the rear guard plate of the slurry pump to slide in through the extension shaft, thereby completing the connection between the guard plate and the pump casing.

[0006] In conjunction with the first aspect, in one possible implementation of the first aspect, the inner diameter of the extended shaft is adapted to the outer diameter of the pump shaft, and the outer diameter of the extended shaft is adapted to the inner diameter of the mounting hole of the rear guard plate.

[0007] In conjunction with the first aspect, in one possible implementation of the first aspect, the inner wall of the extension shaft is connected to the pump shaft so that the extension shaft is fitted onto the pump shaft.

[0008] In conjunction with the first aspect, in one possible implementation of the first aspect, the inner wall of the extended shaft has a threaded structure corresponding to the outer diameter of the pump shaft.

[0009] In conjunction with the first aspect, in one possible implementation of the first aspect, the end of the extended shaft near the rear guard plate has a fastening mechanism for clamping the pump shaft.

[0010] In conjunction with the first aspect, in one possible implementation of the first aspect, the end of the extension shaft near the pump housing has a snap-fit ​​structure for engaging with the pump housing so that the extension shaft is sleeved on the pump shaft.

[0011] In conjunction with the first aspect, in one possible implementation of the first aspect, the device further includes: an impeller having a protrusion and a bottom, the inner diameter of the protrusion being adapted to the outer diameter of the pump shaft, and the outer diameter of the bottom being adapted to the inner diameter of the rear guard plate, so that the impeller seals the rear guard plate after the extension shaft is installed and removed.

[0012] In conjunction with the first aspect, in one possible implementation of the first aspect, the inner diameter of the protrusion has a threaded structure corresponding to the outer diameter of the pump shaft.

[0013] Secondly, this utility model provides an installation process for a slurry pump rear guard plate, applicable to the device for installing a slurry pump rear guard plate according to the first aspect above or any corresponding embodiment. The installation process includes: sleeve an extension shaft onto the pump shaft of the slurry pump; slide the slurry pump rear guard plate along the extension shaft; and connect the bolts of the rear guard plate to the pump casing.

[0014] In conjunction with the second aspect, in one possible implementation of the second aspect, the installation process of the device for installing the rear guard plate of the slurry pump, applied to the first aspect or any of its corresponding embodiments, further includes: after the bolts of the rear guard plate are connected to the pump casing, the extension shaft is removed; and the sealing of the guard plate is completed by the impeller.

[0015] The technical solution of this utility model has the following advantages:

[0016] This utility model provides a device and installation process for installing a rear guard plate of a slurry pump. The device involves sleeved a tubular extension shaft onto the pump shaft of the slurry pump. Since the length of the extension shaft is greater than the thickness of the rear guard plate, the length of the pump shaft is extended by the extension shaft, allowing the rear guard plate to slide in through the extension shaft. The manual movement of the rear guard plate to align with the bolt holes is not affected by the thickness of the pump casing, thus avoiding the easy detachment or displacement of the sealing ring and gasket during the alignment process. Furthermore, because the length of the extension shaft is greater than the thickness of the rear guard plate, the inner wall of the holes in the rear guard plate is in contact with the outer wall of the extension shaft during installation, avoiding the risk of the rear guard plate falling off during installation. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the connection structure between a slurry pump and an extension shaft according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of an impeller structure provided according to an embodiment of the present utility model;

[0020] Figure 3 This is a schematic flowchart illustrating the installation process of a slurry pump rear guard plate according to an embodiment of the present utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Slurry pump; 11-Pump casing; 12-Rear guard plate; 2-Extension shaft; 3-Impeller;

[0023] 31 - Protrusion; 32 - Bottom. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0026] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0028] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0029] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0031] like Figure 1As shown, according to an embodiment of the present invention, a device for installing a rear guard plate of a slurry pump is provided. The device includes: an extension shaft 2, which is a tubular structure and is sleeved on the pump shaft of the slurry pump 1. The length of the extension shaft 2 is greater than the thickness of the rear guard plate 12 of the slurry pump 1, so that the extension shaft 2 protrudes from the rear guard plate 12. The extension shaft 2 is used to allow the rear guard plate 12 of the slurry pump to slide in through the extension shaft, thereby completing the connection between the guard plate 12 and the pump casing 11.

[0032] Specifically, the extension shaft 2 fitted onto the pump shaft of the slurry pump 1 is a tubular structure. It is used to extend the length of the pump shaft, which is shorter than the protruding length of the pump casing, so that the length of the extension shaft 2 is greater than the thickness of the rear guard plate 12 of the slurry pump 1. Thus, after the extension shaft 2 is inserted into the hole of the rear guard plate, i.e. the shaft hole, the rear guard plate is not affected by the pump casing 11 of the slurry pump 1 when it is manually moved to align the bolt holes. After aligning the bolt holes, as the rear guard plate 12 of the slurry pump 1 slides towards the pump casing 11, the inner wall of the hole of the rear guard plate 12 of the slurry pump 1 slides along the outer wall of the extension shaft 2, and the position of the bolt holes after alignment will not change, thereby completing the connection between the rear guard plate 12 of the slurry pump 1 and the pump casing 11.

[0033] This utility model provides a device and installation process for installing a rear guard plate of a slurry pump. The device involves sleeved a tubular extension shaft onto the pump shaft of the slurry pump. Since the length of the extension shaft is greater than the thickness of the rear guard plate, the length of the pump shaft is extended by the extension shaft, allowing the rear guard plate to slide in through the extension shaft. The manual movement of the rear guard plate to align with the bolt holes is not affected by the thickness of the pump casing, thus avoiding the easy detachment or displacement of the sealing ring and gasket during the alignment process. Furthermore, because the length of the extension shaft is greater than the thickness of the rear guard plate, the inner wall of the holes in the rear guard plate is in contact with the outer wall of the extension shaft during installation, avoiding the risk of the rear guard plate falling off during installation.

[0034] In one alternative embodiment, the inner diameter of the extension shaft 2 is adapted to the outer diameter of the pump shaft, and the outer diameter of the extension shaft 2 is adapted to the inner diameter of the mounting hole of the rear guard plate 12.

[0035] Specifically, the extension shaft 2 is a metal tube, such as a steel tube, copper tube, aluminum tube or other metal tube, usually made of steel tube. This embodiment does not specifically limit this.

[0036] Specifically, the inner diameter of the extension shaft 2 being compatible with the outer diameter of the pump shaft means that the inner diameter of the extension shaft 2 is slightly larger than the outer diameter of the pump body. Generally, the inner diameter of the extension shaft 2 is close to the outer diameter of the pump shaft, and the gap is smaller than the preset size. The preset size can be 1 mm, 2 mm or other sizes, which can be set according to the actual working conditions. This embodiment does not make specific limitations on this.

[0037] Specifically, the matching of the outer diameter of the extension shaft 2 with the inner diameter of the mounting hole of the rear guard plate 12 means that the outer diameter of the extension shaft 2 is slightly smaller than the inner diameter of the mounting hole of the rear guard plate 12 of the slurry pump 1. Generally, the outer diameter of the extension shaft 2 is slightly smaller than the inner diameter of the mounting hole of the rear guard plate 12 of the slurry pump 1, and the gap is smaller than the preset size.

[0038] In one alternative embodiment, the inner wall of the extension shaft 2 is connected to the pump shaft so that the extension shaft 2 is fitted onto the pump shaft.

[0039] Specifically, the connection between the inner wall of the extension shaft 2 and the pump shaft includes: the inner wall of the extension shaft 2 is connected by a threaded structure corresponding to the outer diameter of the pump shaft; or, the end of the extension shaft 2 near the rear guard plate 12 has a fastening mechanism, which is used to clamp the pump shaft to achieve a snap-fit ​​connection.

[0040] In one alternative embodiment, the inner wall of the extension shaft 2 has a threaded structure corresponding to the outer diameter of the pump shaft.

[0041] Specifically, during the process of the extension shaft 2 being sleeved on the pump shaft of the slurry pump 1, the inner wall of the extension shaft 2 has a thread structure corresponding to the outer diameter of the pump shaft, which is tightened to achieve the extension shaft 2 being sleeved on the pump shaft, and the extension shaft 2 extending the length of the pump shaft of the slurry pump 1.

[0042] It should be understood that after the rear guard plate 12 of the slurry pump 1 is slid into the installation position by the extension shaft 2, that is, after the four bolts of the rear guard plate 12 of the slurry pump 1 are inserted into the corresponding bolt holes of the pump housing 11, the extension shaft 2 is screwed out by utilizing the threaded structure on the inner wall that corresponds to the outer diameter of the pump shaft. This completes the process of installing and removing the extension shaft 2 after the rear guard plate 12 is installed in subsequent embodiments.

[0043] In one alternative embodiment, the end of the extension shaft 2 near the rear guard plate 12 has a fastening mechanism for clamping the pump shaft.

[0044] Specifically, during the process of the extension shaft 2 being sleeved on the pump shaft of the slurry pump 1, the end of the extension shaft 2 near the rear guard plate 12 has a fastening mechanism to tighten the pump shaft, thereby realizing that the extension shaft 2 is sleeved on the pump shaft and the length of the pump shaft of the slurry pump 1 is extended by the extension shaft 2.

[0045] It should be understood that after the rear guard plate 12 of the slurry pump 1 is slid into the installation position by the extension shaft 2, that is, after the four bolts of the rear guard plate 12 of the slurry pump 1 are inserted into the corresponding bolt holes of the pump housing 11, the clamping mechanism at the end of the extension shaft 2 near the rear guard plate 12 is used to loosen the clamping on the pump shaft, thereby pulling the extension shaft 2 out of the hole of the rear guard plate 12 of the slurry pump 1, thus completing the process of installing and removing the extension shaft 2 after the rear guard plate 12 is completed in the subsequent embodiments.

[0046] In one alternative embodiment, the end of the extension shaft 2 near the pump housing 11 has a snap-fit ​​structure for engaging with the pump housing 11 so that the extension shaft 2 is fitted onto the pump shaft.

[0047] Specifically, during the process of the extension shaft 2 being sleeved on the pump shaft of the slurry pump 1, the extension shaft 2 has a snap-fit ​​structure at one end near the pump casing 11, which realizes the snap-fit ​​connection between the pump casing 11 and the snap-fit ​​structure, thus completing the fixation of the extension shaft 2. This allows the extension shaft 2 to be sleeved on the pump shaft, and the extension shaft 2 extends the length of the pump shaft of the slurry pump 1.

[0048] It should be understood that after the rear guard plate 12 of the slurry pump 1 is slid into the installation position by the extension shaft 2, that is, after the four bolts of the rear guard plate 12 of the slurry pump 1 are inserted into the corresponding bolt holes of the pump housing 11, the snap-fit ​​structure at the end of the extension shaft 2 near the pump housing 11 is used to release the snap-fit ​​connection between the pump housing 11 and the snap-fit ​​structure, thereby releasing the fixation of the extension shaft 2 and pulling the extension shaft 2 out of the hole of the rear guard plate 12 of the slurry pump 1. This completes the process of installing and removing the extension shaft 2 after the rear guard plate 12 is completed in the subsequent embodiments.

[0049] In one alternative implementation, such as Figure 2 As shown, the device also includes an impeller 3, which has a protrusion 31 and a bottom 32. The inner diameter of the protrusion 31 is adapted to the outer diameter of the pump shaft, and the outer diameter of the bottom 32 is adapted to the inner diameter of the rear guard plate 12, so that after the extension shaft 2 completes the installation and removal of the rear guard plate 12, the impeller 3 completes the sealing of the rear guard plate 12.

[0050] Specifically, the inner diameter of the protrusion 31 being compatible with the outer diameter of the pump shaft means that the inner diameter of the protrusion 31 is slightly larger than the outer diameter of the pump shaft. Generally, the inner diameter of the protrusion 31 is close to the outer diameter of the pump shaft, and the gap is smaller than the preset size. The preset size can be 1 mm, 2 mm or other sizes, which can be set according to the actual working conditions. This embodiment does not make specific limitations on this.

[0051] Specifically, the matching of the outer diameter of the bottom 32 with the inner diameter of the rear guard plate 12 means that the outer diameter of the bottom 32 is approximately the same as the inner diameter of the rear guard plate 12. Generally, the outer diameter of the bottom 32 is close to the inner diameter of the rear guard plate 12, and the gap is smaller than the preset size.

[0052] It should be understood that impeller 3 includes, but is not limited to, Figure 2 The style shown. Figure 2 The structure of the impeller 3 is disclosed only by way of example. As long as the impeller 3 has a protrusion 31 and a bottom 32, the sealing of the protective plate 12 can be completed by means of the protrusion 31 and the bottom 32 of the impeller 3.

[0053] This utility model provides a device and installation process for installing a rear guard plate of a slurry pump. The device uses an impeller with a protrusion and a bottom. Since the inner diameter of the protrusion of the impeller is adapted to the outer diameter of the pump shaft, and the outer diameter of the bottom is adapted to the inner diameter of the rear guard plate, the protrusion of the impeller is adapted to the corresponding notch of the pump shaft of the slurry pump, and the bottom of the impeller is adapted to the corresponding notch of the rear guard plate of the slurry pump. Thus, the impeller is used to seal the rear guard plate, further preventing slurry from flowing out.

[0054] In one alternative embodiment, the inner diameter of the protrusion 31 has a threaded structure corresponding to the outer diameter of the pump shaft.

[0055] Specifically, during the sealing process of the rear guard plate 12 after the impeller 3 is completed, the inner diameter of the protrusion 31 is tightened by a threaded structure corresponding to the outer diameter of the pump shaft, thereby achieving the sealing of the rear guard plate 12 by the impeller 3.

[0056] According to an embodiment of the present invention, an installation process embodiment for a slurry pump rear guard plate is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0057] This embodiment provides an installation process for the rear guard plate of a slurry pump, such as... Figure 3 As shown, the installation process includes the following steps:

[0058] S101. Fit the extension shaft onto the pump shaft of the slurry pump.

[0059] Specifically, the methods for fitting the extension shaft onto the pump shaft of the slurry pump include: using the inner wall of the extension shaft to achieve a threaded connection through a threaded structure corresponding to the outer diameter of the pump shaft; or using a fastening mechanism at the end of the extension shaft near the rear guard plate, which is used to clamp the pump shaft to achieve a snap-fit ​​connection; or using a snap-fit ​​structure at the end of the extension shaft near the pump casing to achieve a snap-fit ​​connection, thereby fixing the extension shaft.

[0060] S102. Slide the rear guard plate of the slurry pump along the extended shaft and complete the connection of the bolts of the rear guard plate to the pump casing.

[0061] Specifically, sliding the rear guard plate of the slurry pump along the extended shaft and then connecting the bolts of the rear guard plate to the pump casing involves fitting the extended shaft onto the pump shaft of the slurry pump. The length of the pump shaft, which is shorter than the protruding length of the pump casing, is extended by the extended shaft, making the length of the extended shaft greater than the thickness of the rear guard plate. This allows the extended shaft to be inserted into the holes (shaft holes) of the rear guard plate. During the process of manually moving the rear guard plate to align the bolt holes, the pump casing remains unaffected. Furthermore, after aligning the bolt holes, as the rear guard plate slides towards the pump casing, the inner wall of the holes in the rear guard plate slides along the outer wall of the extended shaft, ensuring that the aligned bolt hole positions remain unchanged, thus completing the connection between the rear guard plate and the pump casing.

[0062] This utility model provides a device and installation process for installing a rear guard plate of a slurry pump. The installation process involves fitting an extension shaft onto the pump shaft of the slurry pump. Since the length of the extension shaft is greater than the thickness of the rear guard plate, the length of the pump shaft is extended, allowing the rear guard plate to slide in via the extension shaft. The manual adjustment of the rear guard plate's position to align with the bolt holes is unaffected by the pump casing thickness, preventing the sealing ring and gasket from easily falling off or shifting during alignment. Furthermore, because the length of the extension shaft is greater than the thickness of the rear guard plate, the inner wall of the holes in the rear guard plate is in contact with the outer wall of the extension shaft during installation, avoiding the risk of the rear guard plate falling off during installation.

[0063] In one alternative embodiment, the installation process further includes:

[0064] After the bolts of the rear guard plate are connected to the pump casing, the extension shaft is removed; the impeller completes the sealing of the guard plate.

[0065] Specifically, after the bolts of the rear guard plate are connected to the pump casing, the extension shaft can be removed in the following ways: by using the threaded structure on the inner wall of the extension shaft that corresponds to the outer diameter of the pump shaft to unscrew it; or by using the fastening mechanism at the end of the extension shaft near the rear guard plate to loosen the clamping on the pump shaft, thereby pulling the extension shaft out of the hole in the rear guard plate of the slurry pump; or by using the snap-fit ​​structure at the end of the extension shaft near the pump casing to release the snap-fit ​​connection between the pump casing and the snap-fit ​​structure, thereby releasing the fixation of the extension shaft and pulling the extension shaft out of the hole in the rear guard plate of the slurry pump.

[0066] This utility model provides a device and installation process for installing a rear guard plate of a slurry pump. The installation process uses an impeller with a protrusion and a bottom. Since the inner diameter of the protrusion of the impeller is adapted to the outer diameter of the pump shaft, and the outer diameter of the bottom is adapted to the inner diameter of the rear guard plate, the protrusion of the impeller is adapted to the corresponding notch of the pump shaft of the slurry pump, and the bottom of the impeller is adapted to the corresponding notch of the rear guard plate of the slurry pump. Thus, the sealing of the rear guard plate after the impeller is installed further prevents the slurry from flowing out.

[0067] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A device for installing a rear guard plate on a slurry pump, characterized in that, The device includes: an extension shaft (2), which is a tubular structure and is sleeved on the pump shaft of the slurry pump (1). The length of the extension shaft (2) is greater than the thickness of the rear guard plate (12) of the slurry pump (1) so that the extension shaft (2) protrudes from the rear guard plate (12). The extension shaft (2) is used to allow the rear guard plate (12) of the slurry pump to slide in through the extension shaft, thereby completing the connection between the rear guard plate (12) and the pump casing (11).

2. The apparatus according to claim 1, characterized in that, The inner diameter of the extension shaft (2) is adapted to the outer diameter of the pump shaft, and the outer diameter of the extension shaft (2) is adapted to the inner diameter of the mounting hole of the rear guard plate (12).

3. The apparatus according to claim 1, characterized in that, The inner wall of the extension shaft (2) is connected to the pump shaft so that the extension shaft (2) is sleeved on the pump shaft.

4. The apparatus according to claim 3, characterized in that, The inner wall of the extension shaft (2) has a threaded structure corresponding to the outer diameter of the pump shaft.

5. The apparatus according to claim 3, characterized in that, The extension shaft (2) has a fastening mechanism at one end near the rear guard plate (12), which is used to clamp the pump shaft.

6. The apparatus according to claim 1, characterized in that, The extension shaft (2) has a snap-fit ​​structure at one end near the pump housing (11), which is used to snap into the pump housing (11) so that the extension shaft (2) is sleeved on the pump shaft.

7. The apparatus according to claim 1, characterized in that, The device further includes an impeller (3) having a protrusion (31) and a bottom (32). The inner diameter of the protrusion (31) is adapted to the outer diameter of the pump shaft, and the outer diameter of the bottom (32) is adapted to the inner diameter of the rear guard plate (12), so that after the extension shaft (2) is installed and removed from the rear guard plate (12), the impeller (3) completes the sealing of the rear guard plate (12).

8. The apparatus according to claim 7, characterized in that, The inner diameter of the protrusion (31) has a threaded structure corresponding to the outer diameter of the pump shaft.

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