Novel shield pump shaft thrust balancing structure

Abstract

The utility model discloses a novel shield pump shaft thrust balancing structure, which relates to the technical field of shield pumps, and comprises a pump shell and a pump shaft arranged in the pump shell, a limiting rod is arranged outside the pump shaft in a penetrating manner, a static disc is arranged outside the pump shaft on the inner side of the pump shell, and the static disc is arranged on the outer side of the pump shaft. A thrust balance disc is connected to the position, on one side of the static disc, of the outer portion of the pump shaft in a sleeving mode, a guide hole is formed in the outer side of the thrust balance disc, and driving mechanisms are arranged on the inner side of the pump shell and in the pump shaft correspondingly. Through the arrangement of the static disc, the thrust balance disc and the guide hole, the guide hole formed in the outer side of the thrust balance disc can achieve the purpose of achieving efficient flow guide on the pump shaft to achieve balance, the optimal balance effect of radial force can be achieved through the static disc, and practicability is good; and through the arrangement of a fixing groove, a limiting rod, an electric telescopic rod and a positioning hole, the thrust balance disc and the static disc can be automatically mounted and dismounted, so that the purpose of replacement is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of shielded pumps, in particular to a novel shielded pump shaft thrust balancing structure. Background Art

[0002] The canned motor pump is a special industrial pump, which is characterized by the fact that the pump and the driving motor are sealed in a pressure vessel filled with pumping rings. This structure eliminates the rotating shaft sealing device of traditional pumps and can achieve complete leakage-free operation. During the operation of the canned pump, the impeller will be subjected to the axial thrust generated by the liquid flow. If these thrusts are not balanced, they may cause vibration, wear and even damage to the pump.

[0003] A Chinese patent discloses a centrifugal pump axial thrust self-balancing device (Announcement No. CN209800343U). This patented technology uses an impeller as a force-bearing component of the centrifugal pump axial thrust balancing device. It has a simple and compact structure, greatly simplifies the structure of the centrifugal pump axial thrust balancing device, effectively avoids the occurrence of failures, and thus improves operational reliability.

[0004] However, most of the existing shielded pump shaft self-balancing methods use the impeller as the force-bearing component of the centrifugal pump axial thrust balancing device, which is easy to be damaged in actual use and affects the use of the shielded pump. For example, the above-mentioned reference document uses the impeller as the force-bearing component of the centrifugal pump axial thrust balancing device. In actual application, the impeller is easy to be damaged when subjected to force, which in turn affects the use of the shielded pump. Therefore, those skilled in the art provide a new shielded pump shaft thrust balancing structure to solve the problems raised in the above-mentioned background technology. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a novel shielded pump shaft thrust balancing structure, which solves the problems raised by the above-mentioned background technology.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a new shielded pump shaft thrust balancing structure, comprising: a pump housing and a pump shaft arranged inside the pump housing, a limit rod is arranged through the outside of the pump shaft, a stationary disk is arranged on the inside of the pump housing outside the pump shaft, a thrust balancing disk is sleeved on one side of the stationary disk outside the pump shaft, a guide hole is opened on the outside of the thrust balancing disk, and a driving mechanism is arranged on the inside of the pump housing and the inside of the pump shaft.

[0007] As a further technical solution of the utility model, positioning holes are provided on the inner side of the thrust balancing disc and the outer side of the stationary disc, and one end of the limiting rod is embedded in the positioning hole.

[0008] As a further technical solution of the utility model, the driving mechanism includes a fixed groove opened inside the pump shaft, an electric telescopic rod is installed inside the fixed groove, and the telescopic end of the electric telescopic rod is arranged at one end of the limiting rod.

[0009] As a further technical solution of the utility model, an installation hole is opened on one side of the limiting rod, and one end of the electric telescopic rod is embedded inside the installation hole and is threadedly connected with the installation hole.

[0010] As a further technical solution of the utility model, four limiting rods are symmetrically arranged on the outer side of the pump shaft, and the limiting rods are all cylindrical.

[0011] As a further technical solution of the utility model, the static disk and the thrust balance disk have the same radius, and a wear-resistant layer is coated on one side of the static disk close to the thrust balance disk.

[0012] The utility model provides a novel thrust balance structure for a canned motor pump shaft, which has the following beneficial effects compared with the prior art:

[0013] 1. For the novel thrust balance structure of the canned motor pump shaft designed in this way, through the settings of the static disk, the thrust balance disk and the guide holes, the guide holes opened on the outer side of the thrust balance disk can be used to efficiently guide the flow of the pump shaft to achieve the purpose of balance, and the best balance effect of the radial force can be achieved through the static disk, which has good practicability.

[0014] 2. For the novel thrust balance structure of the canned motor pump shaft designed in this way, through the settings of the fixed groove, the limiting rod, the electric telescopic rod and the positioning hole, when the electric telescopic rod in the fixed groove works, one end of the limiting rod will be embedded inside the positioning hole, and then the positioning installation of the thrust balance disk and the static disk can be realized. This setting has a simple structure and convenient operation, and can realize the automatic installation and disassembly of the thrust balance disk and the static disk for the purpose of easy replacement. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of a novel thrust balance structure for a canned motor pump shaft;

[0016] Figure 2 It is a structural schematic diagram of the thrust balance disk in a novel thrust balance structure for a canned motor pump shaft;

[0017] Figure 3 It is a structural schematic diagram of the limiting rod in a novel thrust balance structure for a canned motor pump shaft.

[0018] In the figure: 1. Pump housing; 2. Pump shaft; 3. Static disk; 4. Thrust balance disk; 41. Guide hole; 42. Positioning hole; 5. Limiting rod; 51. Fixed groove; 52. Electric telescopic rod; 53. Installation hole. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1-3 , the present utility model provides a technical solution for a new type of thrust balance structure of a canned motor pump: including: a pump housing 1 and a pump shaft 2 arranged inside the pump housing 1. A limiting rod 5 is penetrated through the outside of the pump shaft 2. A stationary disk 3 is arranged on the inner side of the pump housing 1 outside the pump shaft 2. A thrust balance disk 4 is sleeved on one side of the stationary disk 3 outside the pump shaft 2. A guide hole 41 is opened on the outside of the thrust balance disk 4. Driving mechanisms are arranged on the inner side of the pump housing 1 and inside the pump shaft 2. This setting can achieve the purpose of efficient flow guiding to achieve thrust balance by using the guide hole 41 opened on the outside of the thrust balance disk 4, and can achieve the best balance effect of radial force through the stationary disk 3, with good practicability.

[0021] As Figure 2 and Figure 3 shown, positioning holes 42 are opened on the inner side of the thrust balance disk 4 and the outer side of the stationary disk 3. One end of the limiting rod 5 is embedded inside the positioning hole 42. Four limiting rods 5 are symmetrically arranged on the outside of the pump shaft 2, and the limiting rods 5 are all cylindrical. This setting can achieve the positioning installation and disassembly of the thrust balance disk 4 and the stationary disk 3 by using the limiting rod 5 to be embedded inside the positioning hole 42, so as to facilitate their replacement for the use of the canned motor pump.

[0022] As Figure 3 shown, the driving mechanism includes a fixing groove 51 opened inside the pump shaft 2. An electric telescopic rod 52 is installed inside the fixing groove 51. The telescopic end of the electric telescopic rod 52 is arranged at one end of the limiting rod 5. An installation hole 53 is opened on one side of the limiting rod 5. One end of the electric telescopic rod 52 is embedded inside the installation hole 53 and is threadedly connected with the installation hole 53. This setting can make the limiting rod 5 move in the fixing groove 51 to be embedded in or away from the positioning hole 42 by the operation of the electric telescopic rod 52, and then the installation and disassembly of the thrust balance disk 4 and the stationary disk 3 can be realized, with good practicability.

[0023] As Figure 2 shown, the stationary disk 3 and the thrust balance disk 4 have the same radius. A wear-resistant layer is coated on one side of the stationary disk 3 close to the thrust balance disk 4. This setting can improve the service life of the stationary disk 3 by using the wear-resistant layer.

[0024] The working principle of the present utility model is as follows: When the shaft thrust balance structure of the canned motor pump of the present utility model is in use, first, the stationary disk 3 is installed inside the pump housing 1, and the thrust balance disk 4 is installed outside the pump shaft 2. At this time, after installation, the work of the electric telescopic rod 52 inside the fixing groove 51 will cause the limiting rod 5 to move outwards, and one end of the limiting rod 5 will be embedded into the positioning hole 42, so as to achieve the purpose of quickly positioning and installing the thrust balance disk 4 and the stationary disk 3. The structure is simple and has good practicability. At the same time, guide holes 41 are provided on the outer side of the thrust balance disk 4, so as to achieve the purpose of efficiently guiding the flow of the pump shaft 2 to achieve balance. When the pump shaft 2 rotates, there is a certain axial gap between the thrust balance disk 4 and the stationary disk 3, so as to achieve the best balance effect of the radial force, and the practicability is good.

[0025] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the present utility model, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present utility model. The structures, devices and operation methods not specifically described and explained in the present utility model, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A novel axial thrust balance structure for a canned motor pump, characterized in that Comprising: A pump housing (1) and a pump shaft (2) disposed inside the pump housing (1). A limiting rod (5) is disposed through the outside of the pump shaft (2). A stationary disk (3) is disposed outside the pump shaft (2) on the inner side of the pump housing (1). A thrust balance disk (4) is sleeved on one side of the stationary disk (3) outside the pump shaft (2). A guide hole (41) is formed on the outer side of the thrust balance disk (4). Driving mechanisms are disposed inside both the inner side of the pump housing (1) and the pump shaft (2).

2. A novel shaft thrust balance structure of a canned motor pump according to claim 1, characterized in that, Positioning holes (42) are formed on both the inner side of the thrust balance disk (4) and the outer side of the stationary disk (3). One end of the limiting rod (5) is embedded inside the positioning hole (42).

3. A novel axial thrust balance structure of a canned motor pump according to claim 1, characterized in that, The driving mechanism includes a fixing groove (51) formed inside the pump shaft (2). An electric telescopic rod (52) is installed inside the fixing groove (51). The telescopic end of the electric telescopic rod (52) is disposed at one end of the limiting rod (5).

4. A novel shaft thrust balance structure of a canned motor pump according to claim 3, characterized in that, An installation hole (53) is formed on one side of the limiting rod (5). One end of the electric telescopic rod (52) is embedded inside the installation hole (53) and is threadedly connected to the installation hole (53).

5. A novel shaft thrust balance structure of a canned motor pump according to claim 1, characterized in that Four limiting rods (5) are symmetrically disposed on the outside of the pump shaft (2), and the limiting rods (5) are all cylindrically shaped.

6. A novel axial thrust balance structure of a canned motor pump according to claim 1, characterized in that, The stationary disk (3) and the thrust balance disk (4) have the same radius. A wear-resistant layer is coated at a position on one side of the stationary disk (3) close to the thrust balance disk (4).

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