Slurry pump and mounting process of slurry pump

By forming a chamber on the inner wall of the pump housing of the slurry pump and setting up a glue rod separation chamber to separate the chamber, the problem of short wear and life of the rear guard plate is solved, extending the service life and reducing the risk of damage to the static seal structure.

CN119641647APending Publication Date: 2025-03-18PANGANG GROUP MINING CO LTD
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Patent Information

Application Number
CN202411867511.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The rear guard plate of the slurry pump wears the gap between the pump housing, resulting in the static sealing structure being destroyed and has a short service life.

Method used

At least one glue rod is provided in the chamber formed by the inner wall of the pump housing and the outer surface of the rear guard plate, and the chamber is separated by the glue rod, thereby forming a plurality of small chambers, reducing overall wear of the outer surface area of ​​the rear guard plate.

Benefits of technology

Through the separation of the glue rod, the service life of the rear guard plate is extended and the risk of static sealing structure is reduced.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of slurry pumps, and discloses a slurry pump and a mounting process of the slurry pump, the slurry pump comprises a pump body, a pump shell and a rear protection plate, the pump body is connected with the pump shell, the pump shell is connected with the rear protection plate, a cavity is formed by the inner wall of the pump shell and the outer surface of the rear protection plate, the inner wall of the cavity is provided with at least one glue stick, and the glue stick is arranged in the cavity. And each glue stick is provided with a separation cavity. According to the scheme, at least one glue stick is arranged in the cavity formed by the inner wall of the pump shell and the outer surface of the rear protection plate, each glue stick is used for separating the cavity, and therefore the multiple small cavities are formed, and when ore pulp enters the cavities due to the existence of gaps, the ore pulp enters the small cavities firstly and then enters the rear protection plate; and when the rubber rods are abraded until the corresponding small cavities cannot play a role in separation, the ore pulp can abrade the outer surface area of the corresponding rear protection plate in the next small cavity or the outer surface areas of other rear protection plates, so that the service life of the rear protection plate is prolonged by utilizing separation of the rubber rods.
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Description

Technical Field

[0001] The invention relates to the technical field of slurry pumps, and in particular to a slurry pump and an installation process of the slurry pump. Background Art

[0002] Slurry pumps are a type of equipment commonly used in various industries. The characteristic of this type of equipment is that the flow parts need to be replaced regularly. The flow parts of this type of slurry pump are mainly composed of a front guard plate, a rear guard plate, a pump casing, etc. The rear guard plate of the slurry pump is fixed to the pump casing by four bolts, and a static seal with the pump casing is achieved through a sealing ring and a sealing gasket to prevent the slurry from flowing out. In related technologies, there is often a gap of 0.25mm-0.50mm between the guard plate and the pump casing, so that the slurry causes wear on the outer surface of the rear guard plate due to the existence of the gap, which may cause damage to the static sealing structure and reduce the service life of the rear guard plate.

[0003] Therefore, how to effectively extend the service life of the rear guard plate of the slurry pump is an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present invention provides a slurry pump and a slurry pump installation process to solve the technical problem of short service life of a rear guard plate of the slurry pump.

[0005] In the first aspect, the present invention provides a slurry pump and an installation process of the slurry pump, the slurry pump comprising: a pump body, a pump casing and a rear guard plate, the pump body is connected to the pump casing, wherein the pump casing is connected to the rear guard plate, and a chamber is formed by the inner wall of the pump casing and the outer surface of the rear guard plate, the inner wall of the chamber has at least one glue stick, and each glue stick is configured to separate the chamber.

[0006] In combination with the first aspect, in a possible implementation of the first aspect, at least one first annular groove is provided on an outer surface of the rear guard plate.

[0007] In combination with the first aspect, in a possible implementation of the first aspect, at least one second annular groove is provided on the inner wall of the pump housing.

[0008] In combination with the first aspect, in a possible implementation of the first aspect, the outer surface of the rear guard plate is provided with at least one first annular groove (4), and the inner wall of the pump housing is provided with at least one second annular groove.

[0009] In combination with the first aspect, in a possible implementation of the first aspect, at least one first annular groove is provided on the outer surface of the rear guard plate, and at least one second annular groove is provided on the inner wall of the pump casing, and the first annular groove and the second annular groove are alternately provided in the chamber.

[0010] In combination with the first aspect, in a possible implementation of the first aspect, at least one first annular groove is provided on the outer surface of the rear guard plate, and at least one second annular groove is provided on the inner wall of the pump casing, and the first annular groove and the second annular groove are arranged opposite to each other in the chamber.

[0011] In combination with the first aspect, in a possible implementation manner of the first aspect, the number of the glue sticks corresponds to the number of the annular grooves, and the annular grooves are configured to install the glue sticks.

[0012] In a second aspect, the present invention provides an installation process for a slurry pump, which is applied to the slurry pump of the first aspect or any corresponding embodiment thereof, and the installation process comprises: setting at least one rubber stick in a chamber formed by the inner wall of the pump casing and the outer surface of the rear guard plate; after the rear guard plate reaches the installation position, completing the connection between the rear guard plate and the pump casing so that the inner wall of the pump casing and the outer surface of the rear guard plate are in contact with the rubber stick.

[0013] In combination with the second aspect, in a possible implementation of the second aspect, at least one glue stick is arranged in a chamber formed by the inner wall of the pump casing and the outer surface of the rear guard plate, including: forming at least one annular groove on the inner wall of the pump casing and / or the outer surface of the rear guard plate; and each glue stick is arranged in the corresponding annular groove.

[0014] In combination with the second aspect, in a possible implementation of the second aspect, at least one annular groove is formed on the inner wall of the pump casing and / or the outer surface of the rear guard plate, including: when the inner wall of the pump casing and the outer surface of the rear guard plate both have at least one annular groove, a first annular groove is formed on the inner wall of the pump casing, and a second annular groove is formed on the outer surface of the rear guard plate; the positions of the first annular groove and the second annular groove are relative or staggered.

[0015] The technical solution of the present invention has the following advantages: The present invention provides a slurry pump and a slurry pump installation process. The slurry pump is provided with at least one rubber stick in a chamber formed by the inner wall of the pump casing and the outer surface of the rear guard plate, and each rubber stick is used to separate the chamber. In this process, at least one rubber stick is used to separate the chamber, thereby forming a plurality of small chambers, so that when the slurry enters the chamber due to the existence of the gap, it first enters the small chamber, causing the rubber stick in the small chamber and the outer surface area of ​​the rear guard plate corresponding to the small chamber. When the rubber stick is worn to the point that the corresponding small chamber cannot play a separating role, the slurry will cause wear to the outer surface area of ​​the rear guard plate corresponding to the next small chamber, or other outer surface areas of the rear guard plate, thereby using the separation of the rubber stick to reduce the overall wear of the outer surface area of ​​the rear guard plate, reduce the risk of damage to the static sealing structure, and play a role in extending the service life of the rear guard plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a schematic diagram of a slurry pump connection structure provided according to an embodiment of the present invention; Figure 2 It is a schematic flow chart of a slurry pump installation process provided according to an embodiment of the present invention.

[0018] Description of reference numerals: 1- slurry pump; 2- pump casing; 3- rear guard plate; 4- annular groove. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0021] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0023] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0024] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0025] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0026] like Figure 1 As shown, according to an embodiment of the present invention, a slurry pump is provided, which includes: a pump body 1, a pump casing 2 and a rear guard plate 3, the pump body 1 is connected to the pump casing 2, wherein the pump casing 2 is connected to the rear guard plate 3, and a chamber is formed by the inner wall of the pump casing 2 and the outer surface of the rear guard plate 3, the inner wall of the chamber has at least one rubber stick, and each rubber stick is configured to separate the chamber.

[0027] Specifically, the inner wall of the chamber has at least one glue stick, including: one side of the glue stick is fixed by the outer surface of the rear guard plate 3, or the inner wall of the pump housing 2; or, the glue stick is installed in an annular groove on the outer surface of the rear guard plate 3 and / or the inner wall of the pump housing 2.

[0028] Specifically, the inner wall of the chamber has at least one glue stick, which means that at least one glue stick is installed in the chamber, so that the inner wall of the pump housing 2 and the outer surface of the rear guard plate 3 are both in contact with one side of the glue stick, thereby achieving the separation of the chamber by the glue stick. In this case, one side of the glue stick can be fixed on the outer surface of the rear guard plate 3, or the inner wall of the pump housing 2, and after the pump housing 2 and the rear guard plate 3 are installed, the other side of the glue stick is in contact with the inner wall of the pump housing 2, or the outer surface of the rear guard plate 3, so that the glue stick seals the chamber to achieve the effect of chamber separation.

[0029] Specifically, the inner wall of the chamber has at least one glue stick, which means that at least one annular groove is provided on the outer surface of the rear guard plate 3 and / or the inner wall of the pump casing 2, and the glue stick is installed in the corresponding annular groove, so that after the pump casing 2 and the rear guard plate 3 are installed, the outer surface of the rear guard plate 3 and the inner wall of the pump casing 2 are respectively in contact with the glue stick, and the chamber is sealed by the glue stick to achieve the effect of chamber separation.

[0030] Specifically, each rubber stick is set to separate the chamber means that after the pump casing 2 and the rear guard plate 3 are installed, the outer surface of the rear guard plate 3 and the inner wall of the pump casing 2 are in contact with the rubber stick respectively, so that the chamber formed by the pump casing 2 and the rear guard plate 3 is separated into at least two small chambers by the rubber stick, so that when the slurry enters the chamber due to the existence of the gap, it first enters the small chamber, causing the rubber stick in the small chamber and the outer surface area of ​​the rear guard plate corresponding to the small chamber, and when the rubber stick is worn to the corresponding small chamber and can no longer play a separating role, the slurry will cause wear to the outer surface area of ​​the rear guard plate corresponding to the next small chamber, or other outer surface areas of the rear guard plate.

[0031] The present invention provides a slurry pump and a slurry pump installation process. The slurry pump is provided with at least one rubber stick in a chamber formed by the inner wall of the pump casing and the outer surface of the rear guard plate, and each rubber stick is used to separate the chamber. In this process, at least one rubber stick is used to separate the chamber, thereby forming a plurality of small chambers, so that when the slurry enters the chamber due to the existence of the gap, it first enters the small chamber, causing the rubber stick in the small chamber and the outer surface area of ​​the rear guard plate corresponding to the small chamber, and when the rubber stick is worn to the point that the corresponding small chamber cannot play a separating role, the slurry will cause wear to the outer surface area of ​​the rear guard plate corresponding to the next small chamber, or other outer surface areas of the rear guard plate, thereby using the separation of the rubber stick to reduce the overall wear of the outer surface area of ​​the rear guard plate, reduce the risk of damage to the static sealing structure, and play a role in extending the service life of the rear guard plate.

[0032] In an optional embodiment, at least one first annular groove 4 is provided on the outer surface of the rear guard plate 3 .

[0033] Specifically, Figure 1As shown, the first annular groove 4 is arranged on the outer surface of the rear guard plate 3, and the position of the first annular groove 4 can be arranged at any position on the outer surface of the rear guard plate 3. Usually, when there is only one first annular groove 4, the first annular groove 4 is arranged at the center of the outer surface of the rear guard plate 3; usually, when there are multiple first annular grooves 4, the first annular grooves 4 are evenly distributed on the outer surface of the rear guard plate 3. It should be understood that the number and position of the first annular grooves 4 include but are not limited to Figure 1 As shown, after the pump housing 2 and the rear guard plate 3 are installed, the outer surface of the rear guard plate 3 and the inner wall of the pump housing 2 are in contact with the glue stick respectively.

[0034] In an alternative embodiment, Figure 1 As shown, the inner wall of the pump housing 2 is provided with at least one second annular groove.

[0035] Specifically, when the second annular groove is provided on the inner wall of the pump housing 2, the position of the second annular groove can be provided at any position of the inner wall of the pump housing 2. Usually, when there is only one second annular groove, the second annular groove is provided at the center of the inner wall of the pump housing 2; usually, when there are multiple second annular grooves, the second annular grooves are evenly distributed on the inner wall of the pump housing 2. This embodiment does not specifically limit this, as long as after the pump housing 2 and the rear guard plate 3 are installed, the outer surface of the rear guard plate 3 and the inner wall of the pump housing 2 are respectively in contact with the glue stick.

[0036] In an alternative embodiment, Figure 1 As shown, the outer surface of the rear guard plate 3 is provided with at least one first annular groove 4, and the inner wall of the pump housing 2 is provided with at least one second annular groove.

[0037] Specifically, when the first annular groove 4 is arranged on the outer surface of the rear guard plate 3 and the second annular groove is arranged on the inner wall of the pump casing 2, the annular groove arranged on the outer surface of the rear guard plate 3 is the first annular groove 4, and the annular groove arranged on the inner wall of the pump casing 2 is the second annular groove. The positions of the first annular groove and the second annular groove can be relatively set or staggered.

[0038] In an alternative embodiment, Figure 1 As shown, at least one first annular groove 4 is provided on the outer surface of the rear guard plate 3, and at least one second annular groove is provided on the inner wall of the pump housing 2. The first annular groove 4 and the second annular groove are alternately provided in the chamber.

[0039] Specifically, the first annular groove and the second annular groove are staggered in the chamber, which means that on the cross section of the chamber, the first annular groove and the second annular groove are staggered, for example, from bottom to top, they are: the first annular groove, the second annular groove, the first annular groove and the second annular groove, or the first annular groove, the first annular groove, the second annular groove, the first annular groove and the second annular groove, etc., which are not specifically limited in this embodiment. In this case, one side of each rubber stick is installed in the first annular groove or the second annular groove, and the other side contacts the outer surface of the rear guard plate 3 or the inner wall of the pump housing 2, thereby achieving the effect of separating the chambers.

[0040] In an alternative embodiment, Figure 1 As shown, at least one first annular groove 4 is provided on the outer surface of the rear guard plate 3, and at least one second annular groove is provided on the inner wall of the pump housing 2. The first annular groove 4 and the second annular groove are arranged opposite to each other in the chamber.

[0041] Specifically, the first annular groove and the second annular groove are arranged relative to each other in the chamber, which means that on the cross section of the chamber, the first annular groove and the second annular groove are located in a corresponding position. In this case, taking a set of glue sticks as an example, they are named as the first glue stick and the second glue stick, respectively. One side of the first glue stick is installed in the first annular groove, one side of the second glue stick is installed in the second annular groove, and the other side of the first glue stick contacts the other side of the second glue stick, thereby achieving the effect of separating the chambers.

[0042] In an optional embodiment, the number of glue sticks corresponds to the number of annular grooves, and the annular grooves are configured to install the glue sticks.

[0043] Specifically, please refer to the relevant description in the above embodiments, which will not be repeated here.

[0044] The present invention provides a slurry pump and a slurry pump installation process. The slurry pump is provided with at least one rubber stick in a chamber formed by the inner wall of the pump casing and the outer surface of the rear guard plate, and each rubber stick is used to separate the chamber. In this process, at least one rubber stick is used to separate the chamber, thereby forming a plurality of small chambers, so that when the slurry enters the chamber due to the existence of the gap, it first enters the small chamber, causing the rubber stick in the small chamber and the outer surface area of ​​the rear guard plate corresponding to the small chamber, and when the rubber stick is worn to the point that the corresponding small chamber cannot play a separating role, the slurry will cause wear to the outer surface area of ​​the rear guard plate corresponding to the next small chamber, or other outer surface areas of the rear guard plate, thereby using the separation of the rubber stick to reduce the overall wear of the outer surface area of ​​the rear guard plate, reduce the risk of damage to the static sealing structure, and play a role in extending the service life of the rear guard plate.

[0045] According to an embodiment of the present invention, a process embodiment for installing a rear guard plate of a slurry pump is provided. It should be noted that although a logical sequence is shown in the flow chart, in some cases, the steps shown or described may be performed in an order different from that shown here.

[0046] This embodiment provides a slurry pump installation process, such as Figure 2 As shown, the installation process includes the following steps: S101, placing at least one glue stick in a cavity formed by the inner wall of the pump housing and the outer surface of the rear guard plate.

[0047] Specifically, setting at least one glue stick in the chamber formed by the inner wall of the pump casing and the outer surface of the rear guard plate includes: fixing one side of the glue stick to the outer surface of the rear guard plate or the inner wall of the pump casing, or, at least one annular groove is provided on the outer surface of the rear guard plate and / or the inner wall of the pump casing, and the glue stick is installed in the corresponding annular groove.

[0048] S102. After the rear guard plate reaches the installation position, the connection between the rear guard plate and the pump casing is completed so that the inner wall of the pump casing and the outer surface of the rear guard plate are in contact with the glue stick.

[0049] Specifically, after the rear guard plate reaches the installation position, the connection between the rear guard plate and the pump casing is completed so that the inner wall of the pump casing and the outer surface of the rear guard plate are in contact with the glue stick. This means that after the rear guard plate and the pump casing are installed, the inner wall of the pump casing and the outer surface of the rear guard plate are in contact with the glue stick respectively, so that the chamber is sealed by the glue stick to achieve the effect of chamber separation.

[0050] The present invention provides a slurry pump and a slurry pump installation process, wherein at least one rubber stick is arranged in a chamber formed by the inner wall of a pump casing and the outer surface of a rear guard plate, and each rubber stick is used to separate the chamber. In this process, at least one rubber stick is used to separate the chamber, thereby forming a plurality of small chambers, so that when the slurry enters the chamber due to the existence of the gap, it first enters the small chamber, causing the rubber stick in the small chamber and the outer surface area of ​​the rear guard plate corresponding to the small chamber, and when the rubber stick is worn to the point that the corresponding small chamber cannot play a separating role, the slurry will cause wear to the outer surface area of ​​the rear guard plate corresponding to the next small chamber, or other outer surface areas of the rear guard plate, thereby using the separation of the rubber stick to reduce the overall wear of the outer surface area of ​​the rear guard plate, reduce the risk of damage to the static sealing structure, and play a role in extending the service life of the rear guard plate.

[0051] In an optional embodiment, at least one glue stick is arranged in a chamber formed by an inner wall of the pump housing and an outer surface of the rear guard plate, comprising: At least one annular groove is formed on the inner wall of the pump housing and / or the outer surface of the rear guard plate; and each glue stick is arranged in the corresponding annular groove.

[0052] For details, please refer to the relevant description in the above embodiments, which will not be repeated here.

[0053] In an optional embodiment, at least one annular groove is formed on the inner wall of the pump housing and / or the outer surface of the rear guard plate, including: In the case where both the inner wall of the pump housing and the outer surface of the rear guard plate have at least one annular groove, a first annular groove is formed on the inner wall of the pump housing, and a second annular groove is formed on the outer surface of the rear guard plate; The first annular groove and the second annular groove are located opposite to each other or staggered.

[0054] For details, please refer to the relevant description in the above embodiments, which will not be repeated here.

[0055] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A slurry pump, characterized in that: The slurry pump comprises: a pump body (1), a pump casing (2) and a rear guard plate (3), wherein the pump body (1) is connected to the pump casing (2). The pump housing (2) is connected to the rear guard plate (3), and a chamber is formed by the inner wall of the pump housing (2) and the outer surface of the rear guard plate (3), the inner wall of the chamber having at least one glue stick, each glue stick being arranged to separate the chamber.

2. The slurry pump according to claim 1, characterized in that: The outer surface of the rear guard plate (3) is provided with at least one first annular groove (4).

3. The slurry pump according to claim 1, characterized in that: The inner wall of the pump housing (2) is provided with at least one second annular groove.

4. The slurry pump according to claim 1, characterized in that: The outer surface of the rear guard plate (3) is provided with at least one first annular groove (4), and the inner wall of the pump housing (2) is provided with at least one second annular groove.

5. The slurry pump according to claim 4, characterized in that: At least one first annular groove (4) is provided on the outer surface of the rear guard plate (3), and at least one second annular groove is provided on the inner wall of the pump housing (2), wherein the first annular groove (4) and the second annular groove are alternately arranged in the chamber.

6. The slurry pump according to claim 4, characterized in that: At least one first annular groove (4) is provided on the outer surface of the rear guard plate (3), and at least one second annular groove is provided on the inner wall of the pump housing (2), wherein the first annular groove (4) and the second annular groove are arranged opposite to each other in the chamber.

7. The slurry pump according to any one of claims 2 to 6, characterized in that: The number of the glue sticks corresponds to the number of the annular grooves, and the annular grooves are configured to install the glue sticks.

8. A slurry pump installation process, characterized in that: Applied to the slurry pump according to any one of claims 1 to 7, the installation process comprises: Disposing at least one glue stick in a cavity formed by the inner wall of the pump housing and the outer surface of the rear guard plate; After the rear guard plate reaches the installation position, the connection between the rear guard plate and the pump housing is completed so that the inner wall of the pump housing and the outer surface of the rear guard plate are both in contact with the glue stick.

9. The installation process according to claim 8, characterized in that: The method of placing at least one glue stick in a chamber formed by the inner wall of the pump housing and the outer surface of the rear guard plate comprises: At least one annular groove is formed on the inner wall of the pump housing and / or the outer surface of the rear guard plate; Each of the glue sticks is arranged in the corresponding annular groove.

10. The installation process according to claim 9, characterized in that: The at least one annular groove is formed on the inner wall of the pump housing and / or the outer surface of the rear guard plate, comprising: In the case where both the inner wall of the pump housing and the outer surface of the rear guard plate have at least one annular groove, a first annular groove is formed on the inner wall of the pump housing, and a second annular groove is formed on the outer surface of the rear guard plate; The first annular groove and the second annular groove are located opposite to each other or staggered with each other.