Centrifugal pump mechanical seal box mounting structure convenient to mount and dismount

Abstract

The utility model discloses a centrifugal pump mechanical seal box installation structure convenient to install and disassemble, which comprises a pump machine shell, a pump shaft, a pump core assembly, a mechanical seal box and a bearing seat, the pump shaft is assembled in the pump machine shell, and the pump core assembly, the mechanical seal box and the bearing seat are sequentially sleeved on the pump shaft; the mechanical seal box comprises a mechanical seal box body and a bearing bracket, the mechanical seal box body is arranged close to the pump core assembly and fixedly connected with the pump core assembly through a fastener, the bearing bracket is arranged between the mechanical seal box body and the bearing seat, one end of the bearing bracket is tightly attached to the mechanical seal box body, and the other end of the bearing bracket is tightly attached to the bearing seat. And the outer side close to one end of the mechanical seal box main body is fixedly connected with the pump shell. The mechanical seal box is of a split structure, the main body part is fixedly connected with the pump core main body, the other part is connected with the main body in a sleeved mode, the end of the mechanical seal box abuts against the bearing seat, and the outer side of the mechanical seal box is fixedly connected with the pump shell, so that the machining difficulty can be effectively reduced; during disassembly and inspection, the pump core assembly and the mechanical seal box main body can be directly taken down from one end, far away from the bearing seat, of the pump shaft together, and disassembly and assembly are more convenient.

Description

Technical Field

[0001] The utility model relates to the field of water pumps, and particularly to an installation structure of a centrifugal pump gland which is convenient for installation and disassembly. Background Art

[0002] As Figure 1 、 Figure 2 shown, a conventional double-suction multistage centrifugal pump includes a pump housing 1, a pump core assembly 3, a gland 4, a bearing housing, and a pump shaft 2. The pump shaft is assembled in the pump housing, and the gland is sleeved on the pump shaft and is located between the pump core assembly and the bearing housing; the left side of the gland is matched with the pump core assembly, the right side is in close contact with the bearing housing, and the outside is fixedly connected to the pump housing by welding or bolt connection. In the case of bolt connection, the thickness of the flange used at the connection affects the axial support span of the pump shaft, and the stability of the gland and the housing connected by bolts is poor. Compared with the bolt connection method, the welding fixed method has better stability. However, after the gland is welded to the housing, the machining difficulty on the left side of the gland is high. During machining, it is limited by the machining equipment and cannot be machined or the accuracy is poor; at the same time, the cooperation state between the pump core and the gland cannot be observed during pump installation, and there is no way to assist in applying force from the right side to remove the pump core during pump disassembly. Summary of the Invention

[0003] Aiming at the above deficiencies existing in the prior art, the purpose of the utility model is to provide an installation structure of a centrifugal pump gland which is convenient for installation and disassembly, and solve the problems that the existing gland is inconvenient to machine and inconvenient to assemble and disassemble.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A centrifugal pump gland installation structure that is convenient for installation and disassembly, including a pump housing, a pump shaft, a pump core assembly, a gland, and a bearing housing. The pump shaft is assembled inside the pump housing, and the pump core assembly, gland, and bearing housing are sequentially sleeved on the pump shaft. The gland includes a gland body and a bearing bracket. The gland body is arranged close to the pump core assembly and is fixedly connected to the pump core assembly through fasteners. The bearing bracket is placed between the gland body and the bearing housing, with one end sleeved on the gland body and the other end closely attached to the bearing housing, and the outer side of the end close to the gland body is fixedly connected to the pump housing. In this way, the gland is composed of two parts. One part is the gland body, which is fixedly connected to the pump core assembly, and the other part is the bearing bracket. One end of the left and right ends is sleeved on the gland body, and the other end abuts against the bearing housing. The outer side is fixedly connected to the pump housing. In this structure, the gland body and the bearing bracket are processed separately, which can reduce the processing difficulty. At the same time, it can effectively improve the rigidity and overall stability of the equipment, as well as the form and position tolerance of the parts, improve the concentricity of part processing and the adjustment cycle of the assembly center, and is also beneficial to shortening the bearing span. In addition, after the bearing bracket is fixedly connected to the pump housing and sleeved on the pump core assembly, during maintenance, first remove the mechanical seal (located between the gland body and the bearing housing and inside the bearing bracket), and then pull the pump core assembly from the other side. At the same time, insert a tool from the bearing housing side and tap the gland body, so that under the dual action of the pulling force and the tapping force, the pump core assembly and the gland body can be pulled out together from the side (left side) of the pump core assembly. The disassembly is extremely convenient and fast. In this way, the pump core assembly and the gland can be stressed simultaneously, and the bearing bracket does not need to be disassembled, which makes it convenient for the gland body to be centered when installing the gland body after the later maintenance is completed, and the installation is also faster and more convenient.

[0006] Further, a plurality of mounting holes are provided on the gland body, and a plurality of threaded holes corresponding to the mounting holes one by one are provided on the pump core assembly. After the bolts pass through the mounting holes between the gland body and the pump core assembly, they are threadedly engaged and fixed with the threaded holes. In this way, by setting the mounting holes and the threaded holes, it is convenient to fixedly connect the gland body and the pump core assembly together through bolts. After using bolt connection, the connection between the gland body and the pump core is not only firm, but also convenient for later maintenance and disassembly.

[0007] Further, a plug-in portion protruding towards the bearing bracket is provided at one end of the gland body where it is connected to the bearing bracket, and one end of the bearing bracket connected to the gland is sleeved on the plug-in portion. In this way, through the plug-in fit between the plug-in portion of the gland body and the bearing bracket, this structure can not only ensure that the gland body and the bearing bracket form an integral body after installation, but also enable the gland body to be separated from the side end of the bearing bracket under the action of external force during disassembly and inspection. During installation, it can be directly aligned and fitted to form an integral body.

[0008] Further, the bearing bracket is cylindrical, and one end close to the main body of the mechanical seal housing bulges outward to form an annular assembly boss. The outer side of the assembly boss is fixed to the pump housing by welding. The corresponding side of the assembly boss is in close contact with the main body of the mechanical seal housing, and the middle part thereof is correspondingly matched with the insertion part. In this way, the bearing bracket is cylindrical, and a circular assembly space is formed in the middle for mating with the insertion part. At the same time, it can also form a clearance for installing other components at the pump shaft. The outwardly protruding part of the bearing bracket is annular, which is convenient for welding and fixing with the pump housing.

[0009] Further, at least one sealing ring is sleeved between the insertion part and the assembly boss. In this way, after the sealing ring is provided, the sealing performance between the insertion part and the bearing bracket can be ensured. Description of the Drawings

[0010] Figure 1 Schematic diagram of the structure in the prior art where the mechanical seal housing and the pump housing are fixed by bolts;

[0011] Figure 2 Schematic diagram of the installation structure in the prior art where the mechanical seal housing and the pump housing are fixed by welding;

[0012] Figure 3 Installation structure of the centrifugal pump mechanical seal housing in the embodiment. Detailed Description of the Embodiment

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0014] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the inventive product is habitually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0015] Such as Figure 3As shown in the figure, the installation structure of the centrifugal pump gland 4 that is convenient for installation and disassembly provided by this embodiment includes a pump housing 1, a pump shaft 2, a pump core assembly 3, a gland 4, and a bearing housing 5. The pump shaft 2 is assembled inside the pump housing 1, and the pump core assembly 3, the gland 4, and the bearing housing 5 are sequentially sleeved on the pump shaft 2. The gland 4 includes a gland main body 41 and a bearing bracket 42. The gland main body 41 is arranged close to the pump core assembly 3 and is fixedly connected to the pump core assembly 3 through fasteners. The bearing bracket 42 is placed between the gland main body 41 and the bearing housing 5. One end is sleeved with the gland main body 41, the other end is in close contact with the bearing housing 5, and the outer side of the end close to the gland main body 41 is welded and fixed to the pump housing 1. In this way, the gland 4 is composed of two parts. One part is the gland main body 41, which is fixedly connected to the pump core assembly 3. The other part is the bearing bracket 42. One end of the left and right ends is sleeved with the gland main body 41, the other end abuts against the bearing housing 5, and the outer side is fixedly connected to the pump housing 1. In this structure, the gland main body 41 and the bearing bracket 42 are processed separately, which can reduce the processing difficulty. At the same time, it can effectively improve the equipment rigidity and overall stability, as well as the form and position tolerance of the parts, improve the concentricity of part processing and the adjustment cycle of the assembly center, and is also beneficial to shortening the bearing span. In addition, after the bearing bracket 42 is fixedly connected to the pump housing and sleeved with the pump core assembly 3, during maintenance, first remove the mechanical seal (located between the gland main body and the bearing housing and inside the bearing bracket), and then pull the pump core assembly 3 from the other side. At the same time, insert a tool from the side of the bearing housing and tap the gland main body 41. Then, under the dual action of the pulling force and the tapping force, the pump core assembly 3 and the gland main body 41 can be pulled out from the left side together, and the disassembly is extremely convenient and fast. In this way, the pump core assembly 3 and the gland main body 41 can be stressed simultaneously, and the bearing bracket 42 does not need to be disassembled, which makes it convenient for the gland main body to be centered when installing the gland main body after the later maintenance is completed, and the installation is also faster and more convenient.

[0016] Further, a plurality of installation holes are provided on the gland main body 41, and a plurality of threaded holes corresponding to the installation holes one by one are provided on the pump core assembly 3. After the bolt 45 passes through the installation holes on the gland main body 41, it is threadedly matched and fixed with the threaded holes. In this way, by setting the installation holes and the threaded holes, it is convenient to fixedly connect the gland main body 41 and the pump core assembly 3 together through the bolt 45. After using the bolt 45 for connection, the connection between the gland main body 41 and the pump core is not only firm but also convenient for later maintenance and disassembly.

[0017] Furthermore, at one end of the mechanical seal housing body 41 where it is connected to the bearing bracket 42, there is a plug-in portion 44 protruding towards the bearing bracket 42, and one end of the bearing bracket 42 connected to the mechanical seal housing 4 is sleeved on the plug-in portion 44. In this way, through the plug-in fit between the plug-in portion 44 and the bearing bracket 42, the structure can not only ensure that the mechanical seal housing body 41 and the bearing bracket 42 form an integral body after installation, but also enable the mechanical seal housing body 41 to be disengaged from the side end of the bearing bracket 42 under external force during disassembly and inspection. During installation, they can be directly aligned and fitted to form an integral body.

[0018] Furthermore, the bearing bracket 42 is cylindrical, and one end close to the mechanical seal housing body 41 protrudes outward to form an annular assembly boss 43. The outer side of the assembly boss 43 is fixed to the pump housing 1 body by welding. The corresponding side of the assembly boss 43 is in close contact with the mechanical seal housing body 41, and the middle part is correspondingly matched with the plug-in portion 44. In this way, the bearing bracket 42 is cylindrical, and a circular assembly space is formed in the middle for mating with the plug-in portion 44. At the same time, it can also form a clearance for installing other components at the pump shaft 2. The protruding part of the bearing bracket 42 is annular, which is convenient for welding and fixing to the pump housing 1.

[0019] Furthermore, at least one sealing ring is sleeved between the plug-in portion 44 and the assembly boss 43. Specifically, a circular groove is provided in the middle of the plug-in portion 44 of the mechanical seal housing body 41, and the sealing ring is assembled in the circular groove. In this way, after setting the sealing ring, the sealing performance between the plug-in portion 44 and the bearing bracket 42 can be ensured.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Those of ordinary skill in the art should understand that any modifications or equivalent replacements to the technical solutions of the present invention, without departing from the purpose and scope of the present technical solution, should be covered within the scope of the claims of the present invention.

Claims

1. A centrifugal pump mechanical seal housing installation structure that is convenient for installation and disassembly, comprising a pump housing, a pump shaft, a pump core assembly, a mechanical seal housing and a bearing housing. The pump shaft is assembled in the pump housing, and the pump core assembly, the mechanical seal housing and the bearing housing are sequentially sleeved on the pump shaft. It is characterized in that, The mechanical seal housing includes a mechanical seal housing body and a bearing bracket. The mechanical seal housing body is disposed close to the pump core assembly and is fixedly connected to the pump core assembly through fasteners. The bearing bracket is placed between the mechanical seal housing body and the bearing seat, with one end sleeved on the mechanical seal housing body, the other end in close contact with the bearing seat, and the outer side of the end close to the mechanical seal housing body is fixedly connected to the pump casing.

2. The installation structure of the centrifugal pump gland packing facilitating installation and disassembly according to claim 1, characterized in that A plurality of mounting holes are provided on the mechanical seal housing body, and a plurality of threaded holes corresponding to the mounting holes one by one are provided on the pump core assembly. After bolts pass through the mounting holes, the mechanical seal housing body and the pump core assembly are fixedly connected by threadedly mating with the threaded holes.

3. The installation structure of the centrifugal pump gland for easy installation and disassembly according to claim 1 or 2, characterized in that, A plug-in portion protruding towards the bearing bracket is provided at one end of the mechanical seal housing body where it is connected to the bearing bracket, and one end of the bearing bracket connected to the mechanical seal housing is sleeved on the plug-in portion.

4. The installation structure of the centrifugal pump gland for easy installation and disassembly according to claim 3, characterized in that, The bearing bracket is in a cylindrical shape, and one end close to the mechanical seal housing body protrudes outwards to form an annular assembly boss. The outer side of the assembly boss is fixedly connected to the pump casing through welding. The assembly boss is in close contact with the corresponding side of the mechanical seal housing body, and the middle part is correspondingly matched with the plug-in portion.

5. The installation structure of the centrifugal pump gland for easy installation and disassembly according to claim 4, characterized in that, At least one sealing ring is also sleeved between the plug-in portion and the assembly boss.

Images