Special tool for mounting LNG (liquefied natural gas) low-pressure pump impeller jacket

Abstract

The utility model discloses a special tool for installing an LNG low-pressure pump impeller jacket, which comprises a jacket positioning piece and a jacket fastening piece, the jacket positioning piece is provided with an axial first through hole, the jacket positioning piece is sleeved on the outer side of a pump shaft, the lower end of the first through hole is provided with an internal thread, and the upper end of the jacket is provided with an external thread which is in threaded connection with the internal thread; the clamping sleeve fastening piece is provided with an axial second through hole, the clamping sleeve fastening piece is arranged on the outer side of the pump shaft in a sleeving mode, the clamping sleeve fastening piece is arranged above the clamping sleeve positioning piece, and the clamping sleeve fastening piece and the clamping sleeve positioning piece are of a split structure. According to the structure of the pump shaft, the impeller and the clamping sleeve, the special clamping sleeve installation tool is designed, the lower end of the clamping sleeve positioning piece is in threaded connection with the upper end of the clamping sleeve, the clamping sleeve fastening piece is manually held by hand to be used for knocking the clamping sleeve positioning piece downwards, and through threaded connection, stress is even when the clamping sleeve is installed; uniform axial force is applied to the clamping sleeve through the clamping sleeve fastening piece and the clamping sleeve positioning piece, and installation of the impeller and the clamping sleeve is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of jacket installation, in particular to a special tool for installing an impeller jacket of an LNG low-pressure pump. Background Art

[0002] The jacket of the LNG low-pressure pump is installed between the impeller and the pump shaft to fix the impeller. The inner diameter of the jacket and the outer diameter of the pump shaft are clearance fit, and the outer diameter of the jacket and the inner diameter of the impeller are interference fit. When installing the impeller, the impeller needs to be placed in an oven and heated to 90-110°C. After heating, the impeller is sleeved on the pump shaft, and then the jacket is installed between the pump shaft and the impeller for fixing. Since the outer diameter of the jacket and the inner diameter of the impeller are interference fit when installing the jacket, the friction force is large during installation, so a special tooling for jacket installation is required to apply a uniform axial force to install the jacket to the specified position. Utility Model Content

[0003] The purpose of the present application is to provide a special tool for installing an impeller jacket of an LNG low-pressure pump to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] A special tool for installing the impeller jacket of an LNG low-pressure pump, comprising:

[0006] A jacket positioning piece, wherein the jacket positioning piece is provided with a first axial through hole, the jacket positioning piece is sleeved on the outside of the pump shaft, the lower end of the first through hole is provided with an internal thread, and the upper end of the jacket is provided with an external thread threadedly connected to the internal thread;

[0007] A jacket fastener is provided with a second axial through hole, the jacket fastener is sleeved on the outside of the pump shaft, the jacket fastener is arranged above the jacket positioning piece, and the jacket fastener and the jacket positioning piece are split structures.

[0008] Furthermore, the jacket positioning piece is cylindrical, and the outer diameter of the jacket positioning piece is greater than the outer diameter of the jacket.

[0009] Furthermore, outer edges of upper and lower end surfaces of the jacket positioning member are respectively provided with chamfers.

[0010] Furthermore, chamfers are respectively provided at upper and lower ends of the first through hole.

[0011] Furthermore, the cross section of the jacket fastener is circular, and the upper and lower ends of the outer peripheral wall of the jacket fastener are gradually concave in an arc shape toward the middle.

[0012] Furthermore, the outer diameter of the lower end of the jacket fastener is greater than or equal to the outer diameter of the jacket positioning piece.

[0013] Furthermore, the first through hole and the second through hole have the same aperture.

[0014] Furthermore, the length of the jacket fastener is greater than the length of the jacket positioning piece.

[0015] Furthermore, the jacket fastener and the jacket positioning member are separate structures.

[0016] In summary, the technical effects and advantages of the utility model are as follows: the utility model designs a special installation tool for the jacket according to the structure of the pump shaft, impeller and jacket. The lower end of the jacket positioning piece is threadedly connected to the upper end of the jacket. The manually held jacket fastener is used to knock the jacket positioning piece downward, which can make the jacket fastener, jacket positioning piece and jacket fully contact. The threaded connection can make the force uniform when installing the jacket, and a uniform axial force is applied to the jacket through the jacket fastener and the jacket positioning piece, thereby realizing the installation of the impeller and the jacket. The tool design is simple, ingenious, safe and reliable. On the premise of ensuring the safety of the jacket installation operation, it can greatly improve the efficiency of the installation work and save maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A top view of an impeller jacket installation for an LNG low-pressure pump in one embodiment of the utility model;

[0019] Figure 2 for Figure 1 AA section view;

[0020] Figure 3 This is a left view of the installation of an impeller jacket for an LNG low-pressure pump in one embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the installation of an impeller jacket for an LNG low-pressure pump in one embodiment of the utility model.

[0022] in,

[0023] 01. Pump shaft; 02. Impeller; 03. Jacket;

[0024] 1. Jacket positioning member; 11. First through hole; 12. Internal thread;

[0025] 2. Jacket fastener; 21. Second through hole; 22. Arc-shaped concave. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] This embodiment provides a special tool for installing the impeller jacket of an LNG low-pressure pump, such as Figure 1-Figure 4As shown, it includes a jacket positioning member 1 and a jacket fastener 2, and the jacket fastener 2 and the jacket positioning member 1 are split structures. The jacket positioning member 1 is used to connect with the jacket 03 to realize the positioning of the jacket 03, and the jacket fastener 2 is used to knock the jacket positioning member 1 downward. Under the action of gravity and knocking force, the jacket 03 is installed between the impeller 02 and the pump shaft 01. The jacket positioning member 1 is provided with a first axial through hole 11, and the jacket positioning member 1 is sleeved on the outside of the pump shaft 01, and the jacket positioning member 1 can slide freely on the pump shaft 01. The lower end of the first through hole 11 is provided with an internal thread 12, and the upper end of the jacket 03 is provided with an external thread threadedly connected to the internal thread 12, so that the jacket fastener 2, the jacket positioning piece 1 and the jacket 03 can be fully in contact; the jacket fastener 2 is provided with an axial second through hole 21, and the jacket fastener 2 is sleeved on the outside of the pump shaft 01. The jacket fastener 2 can slide freely on the pump shaft 01, and the jacket fastener 2 is arranged above the jacket positioning piece 1.

[0031] In this embodiment, a special installation tool for the jacket 03 is designed according to the structure of the pump shaft 01, the impeller 02 and the jacket 03. The lower end of the jacket positioning piece 1 is threadedly connected to the upper end of the jacket 03. The manually held jacket fastener 2 is used to knock the jacket positioning piece 1 downward. The threaded connection can make the force uniform when installing the jacket 03. A uniform axial force is applied to the jacket 03 through the jacket fastener 2 and the jacket positioning piece 1, thereby realizing the installation of the impeller 02 and the jacket 03. The impeller needs to be placed in an oven for heating before installation.

[0032] Specifically, the jacket positioning member 1 is cylindrical, and the outer diameter of the jacket positioning member 1 is greater than the outer diameter of the jacket 03 .

[0033] Furthermore, the outer edges of the upper and lower end surfaces of the jacket positioning member 1 are chamfered. The upper and lower ends of the first through hole 11 are chamfered, for example, the chamfer size may be C2.5mm. The smooth chamfering can improve the safety of the operator.

[0034] Specifically, the cross-section of the jacket fastener 2 is circular, and the upper and lower ends of the outer peripheral wall of the jacket fastener 2 are gradually arc-shaped and concave 22 toward the middle, so that the jacket fastener 2 as a whole is similar to a small waist shape, which is convenient for the operator to hold the middle of the jacket fastener 2 and knock downward, making it easy to hold.

[0035] Furthermore, the outer diameter of the lower end of the jacket fastener 2 is greater than or equal to the outer diameter of the jacket positioning member 1. For example, in this embodiment, the outer diameters of the upper and lower ends of the jacket fastener 2 and the outer diameter of the jacket positioning member 1 are both 84 mm, and the outer diameter of the smallest part of the jacket fastener 2 is 70 mm.

[0036] Furthermore, the first through hole 11 and the second through hole 21 have the same aperture, and the apertures of the first through hole 11 and the second through hole 21 are both 60 mm.

[0037] Further, the length of the jacket fastener 2 is greater than the length of the jacket positioning member 1. For example, in this embodiment, the length of the jacket fastener 2 is 100 mm, and the length of the jacket positioning member 1 is 60 mm.

[0038] In summary, the special tooling of this embodiment is simple, ingenious, safe and reliable in design. It can greatly improve the efficiency of the installation work and save maintenance costs while ensuring the safety of the jacket installation operation.

[0039] Although the preferred implementation cases of the utility model have been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the utility model, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the utility model and the claims, which all fall within the scope of protection of the utility model.

Claims

1. A special tool for installing the impeller jacket of an LNG low-pressure pump, characterized in that: include: A jacket positioning piece, wherein the jacket positioning piece is provided with a first axial through hole, the jacket positioning piece is sleeved on the outside of the pump shaft, the lower end of the first through hole is provided with an internal thread, and the upper end of the jacket is provided with an external thread threadedly connected to the internal thread; A jacket fastener is provided with a second axial through hole, the jacket fastener is sleeved on the outside of the pump shaft, the jacket fastener is arranged above the jacket positioning piece, and the jacket fastener and the jacket positioning piece are split structures.

2. The special tooling for installing the impeller jacket of the LNG low-pressure pump according to claim 1 is characterized in that: The jacket positioning piece is cylindrical, and the outer diameter of the jacket positioning piece is greater than the outer diameter of the jacket.

3. The special tooling for installing the impeller jacket of the LNG low-pressure pump according to claim 1 is characterized in that: The outer edges of the upper and lower end surfaces of the jacket positioning piece are respectively provided with chamfers.

4. The special tooling for installing the impeller jacket of the LNG low-pressure pump according to claim 1 is characterized in that: The upper and lower ends of the first through hole are respectively provided with chamfers.

5. The special tooling for installing the impeller jacket of the LNG low-pressure pump according to claim 2 is characterized in that: The cross section of the jacket fastener is circular, and the upper and lower ends of the outer peripheral wall of the jacket fastener are gradually concave in an arc shape toward the middle.

6. The special tooling for installing the impeller jacket of the LNG low-pressure pump according to claim 5 is characterized in that: The outer diameter of the lower end of the jacket fastener is greater than or equal to the outer diameter of the jacket positioning piece.

7. The special tooling for installing the impeller jacket of the LNG low-pressure pump according to claim 1 is characterized in that: The first through hole and the second through hole have the same aperture.

8. The special tooling for installing the impeller jacket of the LNG low-pressure pump according to claim 1 is characterized in that: The length of the jacket fastener is greater than the length of the jacket positioning member.

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