Multi-stage staged centrifugal pump balance disc

Abstract

The utility model discloses a multistage stage type centrifugal pump balance disc which comprises a balance disc body and further comprises a protection mechanism, the protection mechanism is additionally installed on the surface of the balance disc body towards the balance ring installation side, and the protection mechanism comprises an insertion hole, a screw hole A, an arc-shaped bushing ring, an insertion groove, an insertion block, an insertion rod and a bolt. Insertion holes are formed in the surface of the balance disc body, screw holes A communicated with the interiors of the insertion holes are formed in the side edges of the balance disc body, the surface of the balance disc body is detachably connected with arc-shaped bushing rings corresponding to the insertion holes in position, in the using process, the arc-shaped bushing rings are used for replacing the balance disc body to serve as friction contact surfaces, abrasion to the balance disc body is reduced, and the service life of the balance disc body is prolonged. When the arc-shaped bushing ring is abraded to a certain degree, the arc-shaped bushing ring can be directly replaced, the maintenance cost of the pump body balance assembly is greatly reduced, meanwhile, the arc-shaped bushing ring is of a combined butt-joint structure, the balance disc body does not need to be detached from the periphery of the shaft body during disassembly and assembly, and the assembly and disassembly convenience of the protection mechanism is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage centrifugal pump components, in particular to a multi-stage centrifugal pump balancing disk. Background Art

[0002] A multistage centrifugal pump is a combination of two or more centrifugal pumps with the same function. In terms of fluid channel structure, the medium pressure relief port of the first stage is connected to the inlet of the second stage, and the medium pressure relief port of the second stage is connected to the inlet of the third stage. Such a series connection mechanism forms a multistage centrifugal pump. The significance of multistage centrifugal pumps is to increase the set pressure. They are widely used in many fields. Due to the high head of multistage high-pressure centrifugal pumps, the axial force generated during operation is very large. In order to ensure the normal operation of the pump, measures must be taken to eliminate or balance the axial force. The balancing disc is widely used due to its simple structure and the ability to completely and automatically balance the axial force. It is one of the core components of multistage centrifugal pumps.

[0003] The existing balancing disc for multi-stage centrifugal pumps has the following disadvantages when in use: although the balancing disc has a good balancing effect, due to structural reasons, the balancing disc is very easy to contact with the balancing sleeve and generate friction. When the friction reaches a certain level, it will cause unstable operation of the rotor, dynamic and static friction, increased motor load, flow rate, head reduction and other phenomena. More serious consequences may occur, such as pump locking and motor failure to operate. The existing maintenance method is generally to directly replace the balancing disc, and the cost of the balancing disc is high. Frequent replacement will increase the use and maintenance cost of the centrifugal pump. For this reason, we propose a multi-stage centrifugal pump balancing disc. Utility Model Content

[0004] The main purpose of the utility model is to provide a multi-stage centrifugal pump balancing disk. By adding a protective mechanism on the surface of the balancing disk body close to the friction surface and by adding an arc-shaped lining ring structure, the direct wear of the balancing disk body is reduced, the maintenance cost is reduced, and the problems in the background technology can be effectively solved.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A balancing disc for a multi-stage centrifugal pump comprises a balancing disc body and a protective mechanism, wherein the protective mechanism is installed on the surface of the balancing disc body toward the balancing ring installation side, and the protective mechanism comprises a socket, a screw hole A, an arc-shaped bushing, a slot, an insert block, an insert rod and a bolt, the surface of the balancing disc body is provided with a socket, and the side of the balancing disc body is provided with a screw hole A connected to the inside of the socket, the surface of the balancing disc body is detachably connected with an arc-shaped bushing corresponding to the position, one end of the arc-shaped bushing is provided with a slot, and the other end of the arc-shaped bushing is integrally formed with an insert block inserted into the inside of the slot, the surface of the arc-shaped bushing is fixedly connected with an insert rod inserted into the inside of the socket, and a bolt is detachably connected between the insert rod and the screw hole A.

[0007] Furthermore, a ferrule is integrally formed at the center of the surface of the balancing disc main body, and a keyway is provided on one side of the inner wall of the ferrule; when installing, the balancing disc main body is inserted into the outer periphery of the centrifugal pump shaft through the ferrule, and after reaching the appropriate position, its position is fixed by a flat key installed between the keyway inside and the keyway of the shaft.

[0008] Furthermore, a rubber pad is bonded to the inner wall of the slot and is located at the connection between the slot and the insert block; the rubber pad structure improves and maintains the tightness of the connection at the end of the arc-shaped liner ring.

[0009] Furthermore, a screw hole B corresponding to the position of screw hole A is opened on one side of the inner part of the insertion rod, and the end of the bolt is screwed into the screw hole B; after the arc-shaped liner ring is installed in place, the screw hole B is aligned with the screw hole A, and the bolt is screwed into the connection to complete the fixation of the position of the arc-shaped liner ring.

[0010] Compared with the prior art, the utility model has the following beneficial effects: a plug hole is provided on the friction surface of the balancing disc body facing the balancing sleeve. When assembling the balancing assembly, two groups of arc-shaped bushings are installed on the surface of the balancing disc body, and the insertion rods on the surfaces of the arc-shaped bushings are aligned with the plug holes and inserted. At the same time, the ends of the arc-shaped bushings are staggered and docked together, so that the plug blocks at the ends of the arc-shaped bushings are just inserted into the slots at the ends of the adjacent arc-shaped bushings, thereby tightly docking the two groups of arc-shaped bushings. At the same time, the positions of the arc-shaped bushings can be fixed by screwing bolts between the screw holes A and the insertion rods. During use, the arc-shaped bushings are used instead of the balancing disc body as the friction contact surface to reduce the wear on the balancing disc body. When the arc-shaped bushings are worn to a certain extent, they can be directly replaced, which greatly reduces the maintenance cost of the pump body balancing assembly. At the same time, the arc-shaped bushings adopt a combined docking structure. During disassembly and assembly, there is no need to remove the balancing disc body from the outer periphery of the shaft body, thereby improving the convenience of installation and disassembly of the protective mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a schematic diagram of the overall structure of a multi-stage centrifugal pump balance disk.

[0012] Figure 2 This is a schematic diagram of the structure of a balancing disc main body of a multi-stage centrifugal pump balancing disc of the utility model without a protective mechanism installed.

[0013] Figure 3 The utility model is a schematic diagram of the structure of the arc-shaped liner ring joint of the balancing disk of a multi-stage centrifugal pump.

[0014] Figure 4 The utility model is a schematic diagram of the side view of the balancing disc main body of a multi-stage centrifugal pump balancing disc.

[0015] Figure 5 The utility model is a schematic diagram of the installation side structure of the arc-shaped liner ring of the balancing disk of a multi-stage centrifugal pump.

[0016] In the figure: 1. balancing disc body; 101. ferrule; 102. keyway; 2. protection mechanism; 201. insertion hole; 202. screw hole A; 203. arc-shaped bushing; 204. slot; 205. insertion block; 206. rubber pad; 207. insertion rod; 208. screw hole B; 209. bolt. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0018] like Figure 1-5 As shown, a balancing disc of a multi-stage centrifugal pump includes a balancing disc body 1 and a protective mechanism 2. The protective mechanism 2 is installed on the surface of the balancing disc body 1 toward the balancing ring installation side. The protective mechanism 2 includes a socket 201, a screw hole A202, an arc-shaped bushing 203, a slot 204, an insert block 205, an insert rod 207 and a bolt 209. The balancing disc body 1 has a socket 201 on its surface and a screw hole A202 connected to the inside of the socket 201 on its side. The balancing disc body 1 has a detachable arc-shaped bushing 203 corresponding to its position on its surface. A slot 204 is provided at one end of the arc-shaped bushing 203 and an insert block 205 inserted into the inside of the slot 204 is integrally formed at the other end of the arc-shaped bushing 203. The surface of the arc-shaped bushing 203 is fixedly connected with an insert rod 207 inserted into the inside of the socket 201 and a bolt 209 is detachably connected between the insert rod 207 and the screw hole A202.

[0019] Among them, a ferrule 101 is integrally formed at the center position of the surface of the balancing disc main body 1, and a key groove 102 is opened on one side of the inner wall of the ferrule 101; when installing, the balancing disc main body 1 is inserted into the outer periphery of the centrifugal pump shaft through the ferrule 101, and after reaching the appropriate position, its position is fixed by a flat key installed between the key groove 102 and the shaft key groove 102.

[0020] Among them, a rubber pad 206 is bonded to the inner wall of the slot 204 and the rubber pad 206 is located at the connection between the slot 204 and the plug block 205, and a screw hole B208 corresponding to the position of the screw hole A202 is opened on one side of the inner part of the plug rod 207, and the end of the bolt 209 is screwed into the screw hole B208; the rubber pad 206 structure improves and maintains the tightness of the connection at the end of the arc-shaped liner ring 203. After the arc-shaped liner ring 203 is installed in place, the screw hole B208 is aligned with the screw hole A202, and the bolt 209 is screwed into the connection to complete the fixation of the position of the arc-shaped liner ring 203.

[0021] It should be noted that the utility model is a multi-stage centrifugal pump balancing disc. When installed, a plug hole 201 is provided on the friction surface of the balancing disc body 1 facing the balancing sleeve. When assembling the balancing assembly, two sets of arc-shaped bushings 203 are installed on the surface of the balancing disc body 1. The plug rods 207 on the surfaces of the arc-shaped bushings 203 are aligned with the plug holes 201 and inserted. At the same time, the ends of the arc-shaped bushings 203 are staggered and docked together, so that the plug blocks 205 at the ends of the arc-shaped bushings 203 are just inserted into the slots 204 at the ends of the adjacent arc-shaped bushings 203, thereby assembling the two sets of arc-shaped bushings 203. The arc-shaped bushing 203 is tightly docked and the bolt 209 is screwed in between the screw hole A202 and the insert rod 207 to fix the position of the arc-shaped bushing 203. During use, the arc-shaped bushing 203 is used instead of the balancing disc body 1 as the friction contact surface to reduce the wear of the balancing disc body 1. When the arc-shaped bushing 203 is worn to a certain extent, it can be directly replaced, which greatly reduces the maintenance cost of the pump body balancing assembly. At the same time, the arc-shaped bushing 203 adopts a combined docking structure. During disassembly and assembly, there is no need to remove the balancing disc body 1 from the outer periphery of the shaft body, which improves the convenience of installation and disassembly of the protective mechanism 2.

[0022] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A multi-stage centrifugal pump balancing disc, comprising a balancing disc body (1), characterized in that: The balancing disc body (1) further comprises a protection mechanism (2). The protection mechanism (2) is installed on the surface of the balancing disc body (1) facing the balancing ring installation side. The protection mechanism (2) comprises a plug hole (201), a screw hole A (202), an arc-shaped bushing (203), a slot (204), an insert block (205), an insert rod (207) and a bolt (209). The balancing disc body (1) has a plug hole (201) on its surface and a screw hole A (202) connected to the inside of the plug hole (201) is opened on the side of the balancing disc body (1). ), the surface of the balancing disc body (1) is detachably connected with an arc-shaped bushing (203) corresponding in position, one end of the arc-shaped bushing (203) is provided with a slot (204), and the other end of the arc-shaped bushing (203) is integrally formed with an insert block (205) inserted into the slot (204), the surface of the arc-shaped bushing (203) is fixedly connected with an insert rod (207) inserted into the insert hole (201), and a bolt (209) is detachably connected between the insert rod (207) and the screw hole A (202).

2. A multi-stage centrifugal pump balancing disk according to claim 1, characterized in that: A clamping sleeve (101) is integrally formed at the center of the surface of the balancing disc main body (1), and a key groove (102) is provided on one side of the inner wall of the clamping sleeve (101).

3. The multi-stage centrifugal pump balancing disk according to claim 1, characterized in that: The inner wall of the slot (204) is bonded with a rubber pad (206), and the rubber pad (206) is located at the connection between the slot (204) and the insert block (205).

4. The multi-stage centrifugal pump balancing disk according to claim 1, characterized in that: A screw hole B (208) corresponding to the position of the screw hole A (202) is opened on one side of the inner part of the insertion rod (207), and the end of the bolt (209) is screwed into the inner part of the screw hole B (208).

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