Protective cover and horizontal centrifugal pump

Abstract

The protective cover comprises a pair wheel protective cover, an end face protective plate and a bottom face protective plate, the pair wheel protective cover is a U-shaped cover body and covers three faces of a coupler, and the bottom face protective plate is located at the open end of the pair wheel protective cover and shields the exposed bottom of the coupler. The end face protection plates are located at the two ends, in the axis direction of the coupler, of the coupling protection cover and provided with installation holes matched with a shaft of the coupler, and the installation holes are used for shielding the shaft, connected with the water pump and the motor, of the coupler. According to the protective cover disclosed by the invention, the coupling protective cover, the end face protective plate and the bottom face protective plate are combined to define the closed cover body structure with the same shape as the coupler, and the periphery of the coupler and the end faces of the two ends, located in the axis direction of the coupler, of the coupler are shielded, so that the risk caused by partial structure exposure of the coupler is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of centrifugal pumps, in particular to a protective cover and a horizontal centrifugal pump. BACKGROUND

[0002] In the related art, a coupling of a horizontal centrifugal pump is externally provided with a counter wheel protective cover, the counter wheel protective cover is a U-shaped cover arranged outside the coupling, but the shaft of the coupling and the lower part of the coupling are in a bare state, and there is a risk of entanglement.

[0003] Therefore, how to reduce the risk of entanglement caused by the bare shaft and bottom of the coupling has become a technical problem to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] The application provides a protective cover to reduce the risk of entanglement caused by the bare shaft and bottom of the coupling. The application also provides a horizontal centrifugal pump.

[0005] In order to achieve the above-mentioned purpose, the application provides a protective cover, which comprises a counter wheel protective cover, an end face protective plate and a bottom face protective plate,

[0006] The counter wheel protective cover is in a U shape, and the counter wheel protective cover is installed on a support of the coupling.

[0007] The bottom face protective plate is located at an open end of the counter wheel protective cover, and the bottom face protective plate is connected with the support or the counter wheel protective cover.

[0008] The end face protective plates are respectively located at two ends of the counter wheel protective cover in the axial direction of the coupling, and are provided with mounting holes matched with the shaft of the coupling, and the end face protective plates are connected with the counter wheel protective cover.

[0009] Preferably, in the protective cover, the end face protective plate comprises a first U-shaped plate and a strip-shaped plate, an open end of the U-shaped plate faces the support of the coupling, the U-shaped plate is the same in shape as an upper end of the counter wheel protective cover, an inner space of the U-shaped plate forms the mounting hole, and the strip-shaped plate abuts against an open end of the U-shaped plate.

[0010] The U-shaped plate is connected with the counter wheel protective cover, and the strip-shaped plate is connected with the counter wheel protective cover or the support of the coupling.

[0011] Preferably, in the protective cover, the counter wheel protective cover is provided with a slot for inserting the U-shaped plate.

[0012] Preferably, in the protective cover, the counter wheel protective cover is provided with a slot for inserting the strip-shaped plate, or the support of the coupling is provided with a slot for slidingly connecting with the strip-shaped plate.

[0013] Preferably, in the protective cover described above, the end face protective plate comprises an arc-shaped plate and a second U-shaped plate, the arc-shaped plate has an arc-shaped slot matched with the shape of the shaft, and the open end of the U-shaped plate faces the shaft, and the internal space of the U-shaped plate and the arc-shaped slot form the mounting hole.

[0014] The arc-shaped plate is connected with the pair of wheel protective cover, and the U-shaped plate is connected with the pair of wheel protective cover or the bracket of the shaft coupling.

[0015] Preferably, in the protective cover described above, the bottom surface protective plate is detachably connected with the bracket of the shaft coupling or the pair of wheel protective cover.

[0016] Preferably, in the protective cover described above, the bracket of the shaft coupling is provided with a slot, and the bottom surface protective plate is insertedly connected with the bracket of the shaft coupling through the slot.

[0017] Preferably, in the protective cover described above, the pair of wheel protective cover and the bracket of the shaft coupling are connected through bolts.

[0018] Preferably, in the protective cover described above, the pair of wheel protective cover, the end face protective plate and the bottom surface protective plate are metal plates.

[0019] And / or,

[0020] The end face protective plate located on the side of the pair of wheel protective cover close to the motor is attached to the inner side bearing of the motor, and the end face protective plate located on the side of the pair of wheel protective cover close to the water pump is attached to the inner side bearing of the water pump.

[0021] A horizontal centrifugal pump comprises a motor, a water pump and a shaft coupling for connecting the motor and the water pump, and further comprises a protective cover located on the outer side of the shaft coupling, wherein the protective cover is the protective cover described in any one of the above solutions.

[0022] The protective cover provided by the embodiments of the present application comprises a pair of wheel protective cover, an end face protective plate and a bottom surface protective plate, the pair of wheel protective cover is a U-shaped cover body, the pair of wheel protective cover covers three surfaces of the shaft coupling, the bottom surface protective plate is located at the open end of the pair of wheel protective cover and covers the exposed bottom of the shaft coupling, and the end face protective plate is located at both ends of the pair of wheel protective cover along the axial direction of the shaft coupling, the end face protective plate has a mounting hole matched with the shaft of the shaft coupling and is used for covering the shaft of the shaft coupling connected with the water pump and the motor. The protective cover disclosed by the present application is combined by the pair of wheel protective cover, the end face protective plate and the bottom surface protective plate to form a closed cover body structure with the same shape as the shaft coupling, and the outer periphery of the shaft coupling and the end faces located at both ends of the shaft coupling in the axial direction are covered to reduce the risk caused by the exposure of part of the structure of the shaft coupling.

[0023] The scheme also discloses a horizontal centrifugal pump, comprising a motor, a water pump and a shaft coupling for connecting the motor and the water pump, and a protective cover as described in any one of the above schemes. The horizontal centrifugal pump with the protective cover has the same technical effects as the protective cover, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some examples or embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise stated, the same reference numbers in the drawings represent the same structure or operation.

[0025] Figure 1 is a structural schematic view of an end face protection plate of the protective cover disclosed by the first embodiment of the present application;

[0026] Figure 2 is a structural schematic view of an end face protection plate of the protective cover disclosed by the second embodiment of the present application;

[0027] Figure 3 is a structural schematic view of a bottom face protection plate of the protective cover disclosed by the embodiments of the present application;

[0028] Figure 4 is a structural schematic view of a wheel protection cover of the protective cover disclosed by the embodiments of the present application.

[0029] The drawings are described as follows:

[0030] 1-wheel protection cover; 2-end face protection plate; 21-first U-shaped plate; 22-strip-shaped plate; 23-arc-shaped plate; 24-second U-shaped plate; 3-bottom face protection plate. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, but not to limit the application. The described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] It should be noted that only parts related to the application are shown in the drawings for the convenience of description. The embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict, as long as the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the features included in the same sentence can be applied independently, and does not have to be applied together with other features.

[0033] As shown in the present application and claims, unless the context clearly indicates otherwise, "one", "a", "an", and / or "the" do not refer to the singular, but can also include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, product or device comprising the element.

[0034] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the present application only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0035] Please refer to Figures 1-4 .

[0036] Some embodiments of the present application disclose a protective cover, comprising a wheel protective cover 1, an end face protective plate 2 and a bottom face protective plate 3, wherein,

[0037] The wheel protective cover 1 is a U-shaped cover body, as Figure 4 shown, the wheel protective cover 1 is bent from one side of the coupling to the upper side of the coupling, and then bent to the other side of the coupling, covering three sides of the coupling, and the wheel protective cover 1 is arranged along the axis direction of the coupling;

[0038] The bottom face protective plate 3 is located at the open end of the wheel protective cover 1, or the bottom face protective plate 3 is located below the coupling, shielding the exposed bottom of the coupling, reducing the risk of entanglement of the coupling due to the exposed bottom, and the bottom face protective plate 3 is connected with the bracket of the coupling or the wheel protective cover 1;

[0039] The end face protection plate 2 is located at both ends of the wheel protection cover 1 along the axis direction of the shaft coupling, has a mounting hole matched with the shaft of the shaft coupling, is connected with the wheel protection cover 1, and shields the shaft of the shaft coupling connected with the water pump and the motor, thereby reducing the risk of twisting injury of the shaft coupling due to exposure.

[0040] The protection cover disclosed in the application is composed of the wheel protection cover 1, the end face protection plate 2 and the bottom face protection plate 3, and is surrounded to form a closed cover structure with the same shape as the shaft coupling, so that the outer periphery of the shaft coupling and the end faces located at both ends in the axis direction of the shaft coupling are shielded, thereby reducing the risk caused by the exposure of part of the structure of the shaft coupling.

[0041] For the convenience of subsequent description, the direction perpendicular to the plane where the bracket of the shaft coupling is located is named as the up-down direction, and the direction parallel to the plane where the bracket of the shaft coupling is located is named as the horizontal direction. Figure 1 As shown in the figure, the end face protection plate 2 includes a first U-shaped plate 21 and a strip-shaped plate 22, the first U-shaped plate 21 and the strip-shaped plate 22 are distributed in the up-down direction, the first U-shaped plate 21 is located above the strip-shaped plate 22, the opening of the first U-shaped plate 21 faces the bracket of the shaft coupling or the opening direction of the first U-shaped plate 21 faces downward, the shape of the first U-shaped plate 21 is the same as the shape of the upper end of the wheel protection cover 1, the strip-shaped plate 22 abuts against the open end of the first U-shaped plate 21, and the shape of the combination of the strip-shaped plate 22 and the first U-shaped plate 21 is the same as the shape of the end face of the wheel protection cover 1. Optionally, the internal space in the first U-shaped plate 21 forms a mounting hole matched with the shaft of the shaft coupling.

[0042] The present scheme divides the end face protection plate 2 into two parts in the up-down direction, and the installation of the first U-shaped plate 21 and the strip-shaped plate 22 can be performed respectively, so that the difficulty of matching the end face protection plate 2 with the shaft coupling and the wheel protection cover 1 can be reduced to a certain extent.

[0043] In the present scheme, the first U-shaped plate 21 is detachably connected with the wheel protection cover 1, and the strip-shaped plate 22 is detachably connected with the bracket of the shaft coupling or the wheel protection cover 1.

[0044] There are various detachable connection modes.

[0045] In some embodiments, a slot is formed on the wheel protection cover 1, the slot is formed along the circumferential direction of the wheel protection cover 1, the slot is provided through the shell wall of the wheel protection cover 1, the first U-shaped plate 21 is installed on the wheel protection cover 1 through the slot, and specifically, the width of the first U-shaped plate 21 along the direction perpendicular to the axis of the shaft coupling is greater than the width of the wheel protection cover 1 along the direction perpendicular to the axis of the shaft coupling, so as to ensure the stability of the connection of the first U-shaped plate 21 with the wheel protection cover 1. Optionally, the open end of the first U-shaped plate 21 has a slot matched with the wall of the wheel protection cover 1.

[0046] In this embodiment, the strip plate 22 can also be plugged into the coupling bracket or the coupling guard 1. In the embodiment where the strip plate 22 is plugged into the coupling bracket, a slot is formed on the coupling bracket by means of angle steel. The slot is perpendicular to the plane of the coupling bracket. The strip plate 22 is inserted into the slot from one side of the coupling bracket along the direction perpendicular to the axis of the coupling. In the embodiment where the strip plate 22 is plugged into the coupling guard 1, slots are opened on the two opposite side plates of the coupling guard 1. The strip plate 22 is inserted into the slot from one side of the coupling guard 1.

[0047] In some embodiments, the coupling guard 1 is bolted to the first U-shaped plate 21, and the strip plate 22 is bolted to the coupling bracket or the coupling guard 1.

[0048] In some embodiments, the coupling guard 1 is snapped into the first U-shaped plate 21, and the strip plate 22 is snapped into the coupling bracket or the coupling guard 1.

[0049] In some embodiments, holes are provided on both the wheel guard 1 and the first U-shaped plate 21, and the wheel guard 1 and the first U-shaped plate 21 are connected by cable ties passing through the holes. Holes are provided on both the strip plate 22 and the coupling bracket, or on both the strip plate 22 and the wheel guard 1, and the strip plate 22 and the coupling bracket, or on both the strip plate 22 and the wheel guard 1, are connected by cable ties passing through the holes.

[0050] The first U-shaped plate 21 and the wheel guard 1, and the strip plate 22 and the wheel guard 1 or the coupling bracket can be connected in the same way or in a different way. Moreover, the connection method of the first U-shaped plate 21 and the wheel guard 1, and the strip plate 22 and the wheel guard 1 or the coupling bracket is not limited to the above embodiment, and can also be other connection methods, which are not specifically limited here.

[0051] In some embodiments, such as Figure 2 As shown, the end face protection plate 2 includes an arc-shaped plate 23 and a second U-shaped plate 24. The arc-shaped plate 23 is located above the second U-shaped plate 24 and has an arc-shaped groove adapted to the shape of the shaft. The open end of the second U-shaped plate 24 faces upward, or in other words, the open end of the second U-shaped plate 24 faces the shaft of the coupling. The internal space of the second U-shaped plate 24 and the arc-shaped groove form a mounting hole. In this embodiment, the second U-shaped plate 24 is the structure that mainly mates with the shaft.

[0052] In this design, the arc plate 23 is detachably connected to the wheel guard 1, and the second U-shaped plate 24 is detachably connected to the coupling bracket or the wheel guard 1.

[0053] There are several ways to detach the connection.

[0054] In some embodiments, the wheel guard 1 is provided with a slot, the slot is arranged along the circumferential direction of the wheel guard 1 and penetrates the shell wall of the wheel guard 1, the arc-shaped plate 23 is installed on the wheel guard 1 through the slot, and specifically, the width of the arc-shaped plate 23 along the direction perpendicular to the axis of the coupling is greater than the width of the wheel guard 1 along the direction perpendicular to the axis of the coupling, so as to ensure the stability of the connection between the arc-shaped plate 23 and the wheel guard 1. Optionally, the open end of the arc-shaped plate 23 is provided with a slot matched with the wall of the wheel guard 1.

[0055] In the embodiment, the second U-shaped plate 24 can also be connected with the bracket of the coupling or the wheel guard 1 in a plug-in manner. In the embodiment in which the second U-shaped plate 24 is connected with the bracket of the coupling in a plug-in manner, a slot is formed on the bracket of the coupling through an angle steel, the slot is perpendicular to the plane in which the bracket of the coupling is located, and the second U-shaped plate 24 is inserted into the slot from one side of the bracket of the coupling along the direction perpendicular to the axis of the coupling. In the embodiment in which the second U-shaped plate 24 is connected with the wheel guard 1 in a plug-in manner, slots are arranged on the opposite side plates of the wheel guard 1, and the second U-shaped plate 24 is inserted into the slots from one side of the wheel guard 1.

[0056] In some embodiments, the wheel guard 1 and the arc-shaped plate 23 are connected through bolts, and the second U-shaped plate 24 and the bracket of the coupling or the wheel guard 1 are connected through bolts.

[0057] In some embodiments, the wheel guard 1 and the arc-shaped plate 23 are connected in a clamping manner, and the second U-shaped plate 24 and the bracket of the coupling or the wheel guard 1 are connected in a clamping manner.

[0058] In some embodiments, holes are arranged on the wheel guard 1 and the arc-shaped plate 23, the wheel guard 1 and the arc-shaped plate 23 are connected through a cable arranged in the holes, and holes are arranged on the second U-shaped plate 24 and the bracket of the coupling or the wheel guard 1, and the second U-shaped plate 24 and the bracket of the coupling or the wheel guard 1 are connected through a cable arranged in the holes.

[0059] The arc-shaped plate 23 and the wheel guard 1, the second U-shaped plate 24 and the wheel guard 1 or the bracket of the coupling can be connected in the same connection manner or in different connection manners, and the connection manner of the arc-shaped plate 23 and the wheel guard 1, the second U-shaped plate 24 and the wheel guard 1 or the bracket of the coupling is not limited to the above-mentioned embodiments, but can also be other connection manners, which are not limited here.

[0060] In the embodiment in which the end face protection plate 2 adopts a split structure, the upper end plate structure and the lower end plate structure of the end face protection plate 2 can adopt an installation mode of being taken out upward and inserted from one side of the wheel guard cover 1, which is convenient for assembly and disassembly. The lower end plate structure close to the water pump is taken out when the water pump is rotated before starting; when the unit is overhauled, the entire protection cover can be disassembled, and the protection cover can be restored in time after the overhaul is completed.

[0061] The split mode of the end face protection plate 2 can be upward and downward splitting or left and right splitting, and can form two pieces or multiple pieces after splitting.

[0062] The end face protection plate 2 is connected to the bracket of the wheel guard cover 1 or the coupling in a detachable mode, which not only ensures the connection strength of the protection cover, but also enables the protection cover to be disassembled, thereby ensuring that the standby machine rotation is convenient for implementation and inspection.

[0063] The protection cover disclosed in the scheme can realize that the coupling is not exposed during operation, effectively reduces the risk of twisting injury of the coupling during use, improves the safety level of the equipment, enhances the safety confidence and working enthusiasm of the post personnel, and helps to promote safety and production.

[0064] The protection cover disclosed in the scheme is convenient for processing and manufacturing, low in cost, small in investment, and high in practicability.

[0065] The horizontal centrifugal pump comprises a motor, a coupling and a water pump, the coupling is used for connecting the motor and the water pump, one side of the protection cover disclosed in the scheme is close to the inner side bearing of the motor, the other side of the protection cover is close to the inner side bearing of the water pump, the protection cover can seal the rotating coupling and the shaft exposed from the bearing, and the bearings located on both sides of the protection cover are sealed, so that the temperature measurement, vibration measurement and oil injection of the bearings by maintenance personnel are not affected.

[0066] In the scheme, the bottom face protection plate 3 is detachably connected to the bracket of the coupling or the wheel guard cover 1.

[0067] In the embodiment in which the bottom face protection plate 3 is detachably connected to the bracket of the coupling, an angle steel is arranged on the bracket of the coupling, the angle steel is welded to the bracket of the coupling, and a slot for plug-in connection of the strip plate 22 and the bottom face protection plate 3 to the bracket of the coupling is formed.

[0068] In the embodiment in which the bottom face protection plate 3 is detachably connected to the wheel guard cover 1, a slot matched with the bottom face protection plate 3 is arranged on the wheel guard cover 1.

[0069] The plug-in direction of the bottom face protection plate 3 is along the horizontal direction.

[0070] The bottom face protection plate 3 and the bracket of the coupling or the wheel guard cover 1 can also be connected by bolts, clamping connection or through a cable tie.

[0071] The wheel guard 1 is detachably connected with the support of the coupling. In some embodiments, the wheel guard 1 is connected with the support of the coupling through bolts; in some embodiments, the wheel guard 1 is connected with the support of the coupling through clamping; in some embodiments, the wheel guard 1 is connected with the support of the coupling through pins; the wheel guard 1 can also be connected with the support of the coupling in other ways, which are not limited herein.

[0072] In order to ensure the overall strength of the guard, the wheel guard 1, the end face guard 2 and the bottom face guard 3 can be metal plates.

[0073] The guard disclosed in the present application has a symmetrical structure, is simple in structure, and is not easy to make mistakes during disassembly and assembly.

[0074] The present application also discloses a horizontal centrifugal pump, comprising a motor, a water pump and a coupling for connecting the motor and the water pump, and further comprising a guard, wherein the guard is any one of the guards described in the above embodiments.

[0075] Since the guard has the above technical effects, the horizontal centrifugal pump with the guard also has the same technical effects, which are not described herein again.

[0076] The above description is only the preferred embodiments of the present application and the explanation of the applied technical principles, and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. The application range involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by the combination of the above technical features or equivalent features without departing from the above application concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A protective cover, characterized in that, The pair of wheel protection cover (1), end face protection plate (2) and bottom surface protection plate (3), The pair of wheel protection cover (1) is U-shaped, and the pair of wheel protection cover (1) is installed on the support of the shaft coupling; The bottom surface protection plate is located at the open end of the pair of wheel protection cover (1), and the bottom surface protection plate is connected with the support or the pair of wheel protection cover (1); The end face protection plate (2) is respectively located at both ends of the pair of wheel protection cover (1) along the axis direction of the shaft coupling, and is provided with a mounting hole matched with the shaft of the shaft coupling, and the end face protection plate (2) is connected with the pair of wheel protection cover (1).

2. The boot claimed in claim 1, wherein The end face protection plate (2) comprises a first U-shaped plate (21) and a strip-shaped plate (22), the opening end of the first U-shaped plate (21) faces the support of the shaft coupling, the first U-shaped plate (21) is the same as the upper end of the pair of wheel protection cover (1) in shape, the internal space of the first U-shaped plate (21) forms the mounting hole, and the strip-shaped plate (22) abuts against the open end of the first U-shaped plate (21), The first U-shaped plate (21) is connected with the pair of wheel protection cover (1), and the strip-shaped plate (22) is connected with the pair of wheel protection cover (1) or the support of the shaft coupling.

3. The boot claimed in claim 2, wherein A slot is formed in the pair of wheel protection cover (1) for inserting the first U-shaped plate (21).

4. A guard shield according to claim 2 or 3, characterised in that, A slot is formed in the pair of wheel protection cover (1) for inserting the strip-shaped plate (22), or a slot is formed in the support of the shaft coupling for slidingly connecting with the strip-shaped plate (22).

5. The bootleg shield of claim 1, wherein, The end face protection plate (2) comprises an arc-shaped plate (23) and a second U-shaped plate (24), the arc-shaped plate (23) has an arc-shaped groove matched with the shape of the shaft, the open end of the second U-shaped plate (24) faces the shaft, and the internal space of the second U-shaped plate (24) and the arc-shaped groove form the mounting hole; The arc-shaped plate (23) is connected with the pair of wheel protection cover (1), and the second U-shaped plate (24) is connected with the pair of wheel protection cover (1) or the support of the shaft coupling.

6. The bootleg shield of claim 1, wherein, The bottom surface protection plate (3) is detachably connected with the support of the shaft coupling or the pair of wheel protection cover (1).

7. The bootleg shield of claim 6, wherein, A slot is formed in the support of the shaft coupling, and the bottom surface protection plate (3) is connected with the support of the shaft coupling through the slot.

8. The bootleg shield of claim 1, wherein, The pair of wheel protection cover (1) is connected with the support of the shaft coupling through bolts.

9. The bootleg shield of claim 1, wherein, The pair of wheel protection cover (1), the end face protection plate (2) and the bottom surface protection plate (3) are metal plates; And / or, The end face protection plate (2) located on the side close to the motor of the pair of wheel protection cover (1) is attached to the inner side bearing of the motor, and the end face protection plate (2) located on the side close to the water pump of the pair of wheel protection cover (1) is attached to the inner side bearing of the water pump.

10. A horizontal centrifugal pump, characterized by The motor, the water pump and the shaft coupling are connected, and the shaft coupling is used for connecting the motor and the water pump, and further comprising a protection cover, the protection cover is located on the outer side of the shaft coupling, and the protection cover is the protection cover in any one of claims 1-9.

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