Oil leakage prevention structure for pump, coupler and pump

Abstract

The utility model provides an oil leakage prevention structure for pump, coupling and pump, the oil leakage prevention structure for pump comprises a baffle plate annularly arranged on the periphery of the pump shaft, in the axial direction of the pump shaft, the baffle plate is located between the coupling and a bearing box for the pump shaft to pass through, a low-pressure area formed by rotation of the coupler is separated from an oil seal structure located between the bearing box and the pump shaft; a ventilation part is formed between the baffle and the bearing box, a first area is formed among the baffle, the bearing box and the oil seal structure, and the first area is communicated with the outside through the ventilation part so as to balance the pressure on the two sides of the oil seal structure. According to the utility model, a low-pressure area generated by the rotation of the coupling is separated from the oil seal structure on the pump shaft, and the low-pressure area is eliminated, so that the leakage of lubricating oil at the oil seal structure due to the existence of pressure difference is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump technical field especially relates to a kind of for the oil leakage prevention structure of pump, shaft coupling and pump. BACKGROUND

[0002] The boiler feed pump used in the existing large coal-fired generating unit is usually directly driven by steam turbine.Under this kind of working condition, the adjustable range of pump rotating speed is wider than that of motor-driven centrifugal pump (up to 6500 rpm at most), so in order to improve the rotor dynamics characteristics of the pump, the shaft coupling of the boiler feed pump adopts a special structure, which makes the center of gravity of the shaft coupling close to the pump side.The flange plate of this shaft coupling is very close to the oil seal structure on the pump shaft, and when the rotating speed of the pump reaches about 3000 rpm, the high-speed rotation of the flange plate of the shaft coupling drives the air flow, and in combination with the shaft coupling shield outside the shaft coupling, a low-pressure area is formed between the flange plate of the shaft coupling and the oil seal structure.The oil seal structure commonly used in the current market for the boiler feed pump is a non-contact labyrinth seal structure, which has the advantages of low price, reliable operation and not easy to wear, but there is a gap between the dynamic ring and the static ring of this oil seal structure, which is difficult to resist the negative pressure generated in the low-pressure area, and thus the lubricating oil in the bearing box may leak to the side of the negative pressure area through the oil seal structure, affecting the safety of equipment operation.

[0003] In view of the above problems, the equipment manufacturers usually use a completely enclosed shaft coupling shell to collect the lubricating oil leaked from the oil seal structure back to the oil tank.However, due to the requirement of sealing, the completely enclosed shaft coupling shell requires strict processing technology, and the cost and weight of the shaft coupling shell are high, and it is very inconvenient to install and disassemble in the field.In addition, if the size of the vent hole in the enclosed shaft coupling shell is not suitable, the temperature in the shaft coupling shell cannot be effectively dissipated, causing the surface temperature of the shaft coupling shell to be too high, even reaching more than 100℃, which is easy to cause accidents such as scalding.

[0004] Therefore, the utility model provides a kind of for the oil leakage prevention structure of pump, shaft coupling and pump to overcome the defects of prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of for the oil leakage prevention structure of pump, shaft coupling and pump, which can separate the low-pressure area generated by the rotation of the shaft coupling from the oil seal structure on the pump shaft, and eliminate the low-pressure area, effectively preventing the leakage of lubricating oil at the oil seal structure due to the existence of pressure difference.

[0006] The purpose of the utility model can be achieved by the following scheme:

[0007] The utility model provides a prevent oil structure for pump, prevent oil structure for pump includes the baffle that is arranged in the circumference of pump shaft, in the axial direction of pump shaft, baffle is located between the shaft coupling and the bearing box that pump shaft passes through, to separate the low pressure area that the shaft coupling rotates forms with the oil seal structure between bearing box and pump shaft.

[0008] Ventilation part is formed between the baffle and the bearing box, and the baffle has a first area between the bearing box and the oil seal structure, the first area is communicated with the outside through the ventilation part, to balance the pressure on both sides of the oil seal structure.

[0009] In a preferred embodiment of the utility model, the baffle comprises:

[0010] The fixed plate is arranged around the outer periphery of the pump shaft, and the two opposite plate surfaces of the fixed plate are connected with the shaft coupling cover arranged outside the shaft coupling and the bearing box, respectively. The ventilation part is located on the plate surface of the fixed plate facing the bearing box;

[0011] The baffle body is arranged around the outer periphery of the pump shaft and connected with the fixed plate. In the radial direction of the pump shaft, the baffle body is located between the fixed plate and the pump shaft.

[0012] In a preferred embodiment of the utility model, the ventilation part is a flow guide groove opened on the plate surface of the fixed plate facing the bearing box, and the two ends of the flow guide groove are connected with the first area and the outside, respectively.

[0013] In a preferred embodiment of the utility model, the flow guide groove extends in the radial direction of the fixed plate;

[0014] And / or, the number of flow guide grooves is multiple, and multiple flow guide grooves are arranged in the circumferential direction of the fixed plate.

[0015] In a preferred embodiment of the utility model, the plate surface of the fixed plate facing the bearing box has an annular positioning boss, so as to form a radial positioning groove on the plate surface of the fixed plate. The end of the bearing box is located in the radial positioning groove and abuts against the inner wall of the positioning boss.

[0016] In a preferred embodiment of the utility model, the fixed plate comprises a plurality of fixed plate splicing parts, and the plurality of fixed plate splicing parts are spliced to form the fixed plate.

[0017] And / or, the baffle body comprises a plurality of baffle splicing parts, and the plurality of baffle splicing parts are spliced to form the baffle body.

[0018] In a preferred embodiment of the utility model, the outer edge of the fixed plate is provided with a sealing groove along its circumference, a sealing ring is arranged in the sealing groove, and the sealing ring is tightly sealed between the shaft coupling cover and the inner wall of the sealing groove.

[0019] In a preferred embodiment of the utility model, the baffle ring is arranged on the outer periphery of the pump shaft, the baffle is connected with the end of the bearing box, and the air passage is located between the plate surface of the baffle on the side facing the bearing box and the end of the bearing box.

[0020] In a preferred embodiment of the utility model, the outer diameter of the baffle is greater than the outer diameter of the shaft coupling cover located on the outer side of the shaft coupling.

[0021] In a preferred embodiment of the utility model, the baffle is connected with the end of the bearing box through a fastener, the fastener is provided with an adjusting ring, and the adjusting ring is tightly pressed between the plate surface of the baffle on the side facing the bearing box and the end of the bearing box.

[0022] In a preferred embodiment of the utility model, the baffle is formed by splicing a plurality of parts.

[0023] The utility model provides a kind of shaft coupling, the shaft coupling and the baffle for the oil leakage prevention structure of pump in above-mentioned are provided on the side facing the bearing box.

[0024] In a preferred embodiment of the utility model, the outer side of the shaft coupling is provided with a shaft coupling cover, one end of the shaft coupling cover is provided with an opening or is sealed, and the other end of the shaft coupling cover is connected with the fixed plate in the oil leakage prevention structure for pump.

[0025] In a preferred embodiment of the utility model, the outer side of the shaft coupling is provided with a shaft coupling cover, one end of the shaft coupling cover is connected with driving equipment, and the other end of the shaft coupling cover is matched with the baffle in the oil leakage prevention structure for pump with gap.

[0026] The utility model provides a kind of pump, and the pump has the oil leakage prevention structure for pump in above-mentioned.

[0027] From above, the utility model is used to pump's leak -proof structure, coupling and pump's characteristics and advantages are: set up the baffle in the outer periphery of pump shaft, in the axial direction of pump shaft, the baffle is located between coupling and bearing box, thereby can form the low pressure area with the oil seal structure between bearing box and pump shaft that coupling rotates is separated, avoid the generation of low pressure area and lead to the lubricating oil in bearing box is absorbed by the gap on the oil seal structure in the pressure difference formed in the both sides of oil seal structure, and reach the effect of preventing lubricating oil leakage. In addition, the vent is formed between the baffle and bearing box, thereby can be communicated with the first area between baffle and bearing box and oil seal structure and outside through the vent, reach the purpose of balancing the pressure of both sides of oil seal structure, avoid the problem that lubricating oil leaks due to the direct action of negative pressure on oil seal structure. BRIEF DESCRIPTION OF DRAWINGS

[0028] The following drawings are only intended to illustrate and explain the utility model and do not limit the scope of the utility model. Among them:

[0029] Figure 1 It is one of the sectional view of the utility model for pump's leak -proof structure;

[0030] Figure 2 It is Figure 1 It is the local enlarged view of the fixed plate, baffle and bearing box connecting position in the utility model for pump's leak -proof structure;

[0031] Figure 3 It is the front view of fixed plate in the utility model for pump's leak -proof structure;

[0032] Figure 4 It is Figure 3 It is the sectional view of A-A direction;

[0033] Figure 5 It is Figure 3 It is the sectional view of B-B direction;

[0034] Figure 6 It is the front view of baffle in the utility model for pump's leak -proof structure;

[0035] Figure 7 It is the second sectional view of the utility model for pump's leak -proof structure;

[0036] Figure 8 It is the third sectional view of the utility model for pump's leak -proof structure.

[0037] The figure reference in the utility model is:

[0038] 1, baffle; 101, fixed plate; 1011, fixed plate splicing part; 102, baffle body; 1021, baffle splicing part; 103, ventilation part; 104, first connecting hole; 105, fourth connecting hole; 106, positioning boss; 107, second connecting hole; 108, third connecting hole; 2, shaft coupling cover; 3, low pressure area; 4, shaft coupling; 5, bearing box; 6, breathing plug; 7, pump shaft; 8, first area; 9, second area; 10, oil seal structure; 11, sealing ring; 12, bearing; 13, fourth fastener; 14, adjusting ring. DETAILED DESCRIPTION

[0039] In order to make the personnel in the technical field better understand the technical solutions in the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the utility model.

[0040] It should be noted that when an element is referred to as "being disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "being connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] Embodiment one

[0043] As Figures 1 to 8As shown, the utility model provides a kind of for pump's oil leakage prevention structure, the oil leakage prevention structure for pump includes the baffle 1 of circular ring, baffle 1 ring is equipped in the outer periphery of pump shaft 7, and in the axial direction of pump shaft 7, baffle 1 is located between shaft coupling 4 and bearing box 5 for pump shaft 7 passes through, to separate the low pressure area 3 formed by the rotation of shaft coupling 4 with the oil seal structure 10 between bearing box 5 and pump shaft 7.Formed with air passage 103 between baffle 1 and bearing box 5, and baffle 1 and bearing box 5 and oil seal structure 10 have the first area 8, the first area 8 can be communicated with the outside by air passage 103, to balance the pressure on both sides of oil seal structure 10.

[0044] In the utility model, baffle 1 is arranged on the outer periphery of pump shaft 7, and in the axial direction of pump shaft 7, baffle 1 is located between shaft coupling 4 and bearing box 5, so that the low pressure area 3 formed by the rotation of shaft coupling 4 can be separated from the oil seal structure 10 between bearing box 5 and pump shaft 7, to avoid the generation of low pressure area 3 to form pressure difference on both sides of oil seal structure 10, so that the lubricating oil in bearing box 5 is sucked out by the gap on oil seal structure 10, to achieve the effect of preventing lubricating oil leakage.In addition, air passage 103 is formed between baffle 1 and bearing box 5, so that the first area 8 between baffle 1, bearing box 5 and oil seal structure 10 can be communicated with the outside through the air passage 103, to balance the pressure on both sides of oil seal structure 10, to avoid the problem that the lubricating oil is leaked due to the direct action of negative pressure on oil seal structure 10.

[0045] In the utility model, shaft coupling 4 can be reverse buckle type shaft coupling, reverse buckle type shaft coupling is connected to pump shaft 7 through flange plate, when pump is in high speed state greater than or equal to 3000 revolutions per minute, the negative pressure generated by reverse buckle type shaft coupling and the flange plate connected therewith in shaft coupling cover 2 will be blocked by baffle 1, and will not cause the lubricating oil to be sucked out of oil seal structure 10.

[0046] In the utility model, the first area 8 is the area outside bearing box 5 and between oil seal structure 10 and baffle 1, and the second area 9 is the area inside bearing box 5 and between oil seal structure 10 and bearing 12.Due to the generation of low pressure area 3, there is still a pressure difference between first area 8 and second area 9 inside bearing box 5, and the pressure of second area 9 can be controlled through breathing plug 6 on bearing box 5, and the pressure of second area 9 is generally equal to atmospheric pressure, if there is still a pressure difference between first area 8 and second area 9, the lubricating oil in bearing box 5 will leak out through the gap of oil seal structure 10, therefore, air passage 103 is arranged in the utility model, to communicate first area 8 with the outside through air passage 103, to balance the pressure of first area 8 and second area 9 (both are atmospheric pressure), to further avoid the problem that the lubricating oil is leaked due to the direct action of negative pressure on oil seal structure 10.

[0047] In an optional embodiment of the utility model, as shown in Figures 1 to 7 The baffle includes a fixed plate 101 in the form of a circular ring and a baffle body 102 in the form of a circular ring, the fixed plate 101 is arranged around the outer periphery of the pump shaft 7, and the two opposite plate surfaces of the fixed plate 101 are connected with the shaft coupling cover 2 sleeved on the outer side of the shaft coupling 4 and the bearing box 5 through which the pump shaft 7 passes, and the air passage 103 is located on the plate surface of the fixed plate 101 on the side facing the bearing box 5; the baffle body 102 is arranged around the outer periphery of the pump shaft 7 and is connected with the fixed plate 101, and in the radial direction of the pump shaft 7, the baffle body 102 is located between the fixed plate 101 and the pump shaft 7, thereby achieving the purpose of separating the low-pressure area 3 formed by the rotating shaft coupling 4 from the oil seal structure 10 located between the bearing box 5 and the pump shaft 7.

[0048] In this embodiment, the fixed plate 101 is arranged around the outer periphery of the pump shaft 7, and the two opposite plate surfaces of the fixed plate 101 are connected with the shaft coupling cover 2 and the bearing box 5, the arrangement of the fixed plate 101 provides a mounting position for the shaft coupling cover 2, and the shaft coupling cover 2 is connected with the bearing box 5, so that the fixed plate 101 plays a role in fixing the shaft coupling cover 2; in addition, based on the arrangement of the fixed plate 101, the baffle body 102 is additionally arranged between the fixed plate 101 and the pump shaft 7, the baffle body 102 is connected with the fixed plate 101, and the baffle body 102 can separate the low-pressure area 3 formed by the rotating shaft coupling 4 from the oil seal structure 10 located between the bearing box 5 and the pump shaft 7, thereby avoiding the situation that the generation of the low-pressure area 3 causes a pressure difference on both sides of the oil seal structure 10, resulting in the lubricating oil in the bearing box 5 being sucked out through the gap on the oil seal structure 10, and achieving the effect of preventing the lubricating oil from leaking.

[0049] Specifically, as shown in Figures 1 to 6 A plurality of first connecting holes 104 are arranged on the fixed plate 101 at positions close to the outer edge thereof and are spaced apart in the circumferential direction, a plurality of first fasteners are arranged between one end of the shaft coupling cover 2 and the plurality of first connecting holes 104, and the fixed plate 101 is fixedly connected with the shaft coupling cover 2 through the plurality of first fasteners. The first fastener can be, but is not limited to, a combination of a bolt and a nut.

[0050] Specifically, as shown in Figures 1 to 6 A plurality of second connecting holes 107 are arranged on the fixed plate 101 at positions close to the inner edge thereof and are spaced apart in the circumferential direction, and a plurality of third connecting holes 108 are arranged on the baffle body 102 at positions close to the outer edge thereof and are spaced apart in the circumferential direction, the plurality of second connecting holes 107 correspond one-to-one to the plurality of third connecting holes 108, and a second fastener is arranged in the opposite second connecting hole 107 and third connecting hole 108, and the baffle body 102 is connected with the fixed plate 101 through the plurality of second fasteners. The second fastener can be, but is not limited to, a bolt.

[0051] Specifically, such as Figures 1 to 6 As shown, a plurality of fourth connecting holes 105 are arranged circumferentially at intervals near the inner edge of the fixing plate 101, and a plurality of fifth connecting holes are arranged at the end of the bearing housing 5. The plurality of fourth connecting holes 105 correspond one-to-one with the plurality of fifth connecting holes. Third fasteners are inserted into the corresponding fourth connecting holes 105 and fifth connecting holes, and the fixing plate 101 and the bearing housing 5 are connected by the plurality of third fasteners. The third fasteners may be, but are not limited to, bolts.

[0052] In this invention, to ensure that the baffle body 102 can effectively separate the low-pressure area 3 from the oil seal structure 10, and that the baffle body 102 does not interfere with the normal operation of the pump shaft 7, the inner diameter of the baffle body 102 must be larger than the outer diameter of the pump shaft 7, so that there is a gap between the inner edge of the baffle body 102 and the outer wall of the pump shaft 7. The radial width of this gap can be, but is not limited to, 0.2 mm to 1 mm. During the installation of the baffle body 102, the gap between the inner edge of the baffle body 102 and the outer wall of the pump shaft 7 can be measured using a feeler gauge or other measuring tools. This gap width can significantly reduce... Figure 1 The negative pressure in the low-pressure area 3 on the left side of the baffle body 102 affects the air pressure in the first area 8 on the right side of the baffle body 102, thereby preventing lubricating oil from being sucked out from the gap of the oil seal structure 10.

[0053] In this embodiment, the baffle body 102 can be made of a softer material such as copper, aluminum, or non-metallic materials (such as polytetrafluoroethylene). That is, the hardness of the material used for the baffle body 102 must be at least lower than the hardness of the pump shaft 7 to prevent frictional engagement between the baffle body 102 and the high-speed rotating pump shaft 7 during operation, thus ensuring the normal operation of the pump shaft 7. The fixing plate 101 can be made of carbon steel, thereby reducing material costs.

[0054] In this embodiment, since the fixing plate 101 needs to support and fix the coupling cover 2, the strength of the fixing plate 101 cannot be too low. Meanwhile, the baffle body 102 needs to be made of a relatively soft material to prevent frictional engagement when it comes into contact with the high-speed rotating pump shaft 7. The fixing plate 101 and the baffle body 102 cannot be a single unit. Furthermore, providing a separate baffle body 102 makes it easier to adjust the gap between the baffle body 102 and the pump shaft 7. To allow observation of whether there is contact between the baffle body 102 and the pump shaft 7 during equipment installation, the fixing plate 101 and the coupling cover 2 need to be separate units. Therefore, in this invention, the fixing plate 101, the baffle body 102, and the coupling cover 2 are separate units.

[0055] In the utility model, the shaft coupling cover 2 can be made by thin wall plate welding, and the production and processing are easier, the weight is lighter, the price is lower, the heat dissipation is better, and the installation and dismounting are easier. Similarly, because the shaft coupling cover 2 is a separate component, before installing the shaft coupling cover 2, it is necessary to check whether there is contact between the inner edge of the installed baffle body 102 and the outer wall of the pump shaft 7 in the circumferential direction and whether the size of the gap meets the design requirements.

[0056] Further, as shown in Figures 1 to 4 The venting portion 103 is a flow guide groove opened on the plate surface of the fixed plate 101 towards the bearing box 5, and the flow guide groove can be a strip-shaped groove extending along the radial direction of the fixed plate 101, and the two ends of the flow guide groove are connected with the first area 8 and the outside respectively. Among them, the number of flow guide grooves is multiple, and the multiple flow guide grooves are arranged along the circumferential direction of the fixed plate 101 and are spaced and uniformly arranged, so as to ensure that the oil seal structure 10 at each position in the circumferential direction of the pump shaft 7 does not appear the lubricating oil leakage.

[0057] In an optional embodiment of the utility model, as shown in Figure 4 And Figure 5 The fixed plate 101 is provided with a circular positioning boss 106 on the plate surface towards the bearing box 5 and along the circumferential direction of the fixed plate 101, so that a radial positioning groove is formed on the plate surface of the fixed plate 101 and inside the positioning boss 106, and the end of the bearing box 5 has a convex part matched with the radial positioning groove, so that after assembly is completed, the end of the bearing box 5 is located in the radial positioning groove and abuts against the inner wall of the positioning boss 106, realizing the radial positioning effect of the fixed plate 101 and the baffle body 102; and in the axial direction, the fixed plate 101 and the bearing box 5 are fixedly connected through bolts, so that the position of the fixed plate 101 and the baffle body 102 can be stably ensured in the radial and axial directions, achieving the radial and axial positioning effects, and ensuring that vibration does not cause the fixed plate 101 and / or the baffle body 102 to fall off during pump operation.

[0058] In an optional embodiment of the utility model, as shown in Figure 3 The fixed plate 101 comprises a plurality of fixed plate splicing portions 1011, and the plurality of fixed plate splicing portions 1011 are spliced to form the circular fixed plate 101, which is more convenient for dismounting and replacing the fixed plate 101. Among them, the number of fixed plate splicing portions 1011 can be two, and each fixed plate splicing portion 1011 is in a semicircular structure, and after a plurality of fixed plate splicing portions 1011 are fixedly assembled, the two fixed plate splicing portions 1011 are spliced to form the circular fixed plate 101. Of course, the number of fixed plate splicing portions 1011 can also be three, four or even more, and the circular fixed plate 101 can be formed by splicing a plurality of fixed plate splicing portions 1011.

[0059] In addition, as shown inFigure 6 As shown, the baffle body 102 comprises a plurality of baffle splicing parts 1021, and the plurality of baffle splicing parts 1021 are spliced to form the annular baffle body 102, which is more convenient for disassembly and replacement of the baffle body 102. The number of the baffle splicing parts 1021 can be two, each baffle splicing part 1021 is in a semicircular structure, and the two baffle splicing parts 1021 are spliced to form the annular baffle body 102 after being fixed and assembled. Of course, the number of the baffle splicing parts 1021 can also be three, four or more, and the annular baffle body 102 can be formed by splicing the plurality of baffle splicing parts 1021.

[0060] Since the fixed plate 101 and the baffle body 102 are both formed by splicing, when the bearing in the bearing box 5 needs to be overhauled, the shaft coupling 4 does not need to be removed, and only the fixed plate 101 and the baffle body 102 need to be removed together with part of the bearing box 5 (such as the upper cover of the bearing box), which is more convenient and effectively improves the overhauling efficiency.

[0061] In an optional embodiment of the utility model, as shown in the figure, Figure 7 The outer edge of the fixed plate 101 is provided with a sealing groove along the circumference thereof, and a sealing ring 11 is arranged in the sealing groove and is tightly sealed between the shaft coupling cover 2 and the inner wall of the sealing groove.

[0062] In another optional embodiment of the utility model, as shown in the figure, Figure 8 The baffle 1 is in an annular whole structure (i.e. the fixed plate 101 and the baffle body 102 in the above embodiment are formed in one body), the baffle 1 is annularly arranged on the outer periphery of the pump shaft 7, the plate surface of the baffle 1 on the side facing the bearing box 5 is connected with the end of the bearing box 5, and the venting part 103 is located between the plate surface of the baffle 1 on the side facing the bearing box 5 and the end of the bearing box 5. The baffle 1 is in an annular whole structure, and compared with the baffle 1 formed by the fixed plate 101 and the baffle body 102 in the above embodiment, the structure of the baffle 1 is simpler, the processing of the baffle 1 is more convenient, and the installation and disassembly of the baffle 1 are more convenient. By connecting the baffle 1 with the bearing box 5, the baffle 1 can be installed and the gap between the baffle 1 and the pump shaft 7 can be detected before the shaft coupling 4 and the shaft coupling cover 2 are installed.

[0063] In the embodiment, the baffle 1 can be made of soft materials such as copper, aluminum or non-metal (such as polytetrafluoroethylene), that is, the hardness of the material of the baffle 1 needs to be lower than the hardness of the pump shaft 7, so as to avoid friction and engagement between the baffle 1 and the high-speed rotating pump shaft 7 during work, and ensure the normal work of the pump shaft 7. The thickness of the baffle 1 can be but is not limited to 3mm to 5mm.

[0064] In the embodiment, the baffle 1 is formed into a ring structure by splicing multiple parts. After assembling the multiple parts, each part is connected with the bearing box 5. Since the bearing box 5 is also a corresponding split structure, when disassembled, the disassembly of the baffle 1 can be completed by simultaneously disassembling the split bearing box 5, which is more simple, easy to operate and convenient for replacement of the baffle 1. Avoiding the interference between the baffle 1 and the shaft coupling 4 caused by the separate disassembly of the baffle 1, effectively reducing the difficulty of disassembling the baffle 1. The baffle 1 can be formed into a circular ring by two parts. Of course, it can also be three parts, four parts, or even more parts, as long as the baffle 1 can be formed into a circular ring by splicing multiple parts.

[0065] In the embodiment, as shown in Figure 8 The outer diameter of the baffle 1 is greater than the outer diameter of the shaft coupling cover 2 located outside the shaft coupling 4. Since the baffle 1 is connected to the end of the bearing box 5, the baffle 1 is not connected with the shaft coupling cover 2, and there is a certain gap between the two. The shaft coupling cover 2 is fixed on other driving equipment. It is because the outer diameter of the baffle 1 is greater than the outer diameter of the shaft coupling cover 2 located outside the shaft coupling 4 that the low-pressure area 3 formed by rotating the shaft coupling 4 can be completely separated from the oil seal structure 10, and the influence of the low-pressure area 3 on the oil seal structure 10 can be avoided to prevent the leakage of lubricating oil.

[0066] In the embodiment, as shown in Figure 8 The baffle 1 is connected to the end of the bearing box 5 through the fourth fastener 13. The fourth fastener 13 is sleeved with an adjusting ring 14. The two ends of the adjusting ring 14 are pressed between the plate surface of the baffle 1 on the side facing the bearing box 5 and the end of the bearing box 5. In the actual assembly process, different thicknesses of the adjusting ring 14 can be replaced to adjust the distance between the baffle 1 and the shaft coupling 4 and the oil seal structure 10 to adapt to the size of different pumps. The distance can be, but is not limited to, 1mm to 1.5mm.

[0067] In an optional embodiment of the utility model, the axial distance between the baffle 1 and the shaft coupling 4 is greater than or equal to 2mm. Preferably, the axial distance between the baffle 1 and the shaft coupling 4 is 2mm to 3mm. By setting the axial distance between the baffle 1 and the shaft coupling 4, the axial movement and thermal displacement of the pump shaft 7 during operation can be avoided, which ensures that the baffle 1 will not affect the normal rotation of the pump shaft 7.

[0068] In the embodiment, when the shaft coupling 4 is connected to the pump shaft 7 through the flange, the axial distance between the baffle 1 and the flange is greater than or equal to 2mm.

[0069] Similarly, the axial distance between the baffle 1 and the oil seal structure 10 is greater than or equal to 2mm. Preferably, the axial distance between the baffle 1 and the oil seal structure 10 is 2mm to 3mm. By setting the axial distance between the baffle 1 and the oil seal structure 10, the axial movement and thermal displacement of the pump shaft 7 during operation can be avoided, and the baffle 1 is ensured to be arranged without affecting the normal rotation of the pump shaft 7.

[0070] The characteristics and advantages of the oil leakage prevention structure for the pump are as follows:

[0071] I. In the oil leakage prevention structure for the pump, the low-pressure area 3 formed by the rotation of the shaft coupling 4 is separated from the oil seal structure 10 located between the bearing box 5 and the pump shaft 7 by the arrangement of the baffle 1, avoiding the situation that the pressure difference formed on both sides of the oil seal structure 10 due to the generation of the low-pressure area 3 causes the lubricating oil in the bearing box 5 to be sucked out through the gap on the oil seal structure 10, thereby achieving the effect of preventing lubricating oil leakage.

[0072] II. In the oil leakage prevention structure for the pump, the air passage 103 is formed between the baffle 1 and the bearing box 5, thereby communicating the first area 8 between the baffle 1, the bearing box 5 and the oil seal structure 10 with the outside environment, balancing the pressure on both sides of the oil seal structure 10, and avoiding the problem of lubricating oil leakage caused by the direct action of negative pressure on the oil seal structure 10.

[0073] III. In the oil leakage prevention structure for the pump, the fixed plate 101 is arranged on the outer periphery of the pump shaft 7, and the two opposite plate surfaces of the fixed plate 101 are connected with the shaft coupling cover 2 and the bearing box 5, respectively. The fixed plate 101 provides a mounting position for the shaft coupling cover 2, connects the shaft coupling cover 2 with the bearing box 5, and thus the fixed plate 101 functions to fix the shaft coupling cover 2. In addition, based on the arrangement of the fixed plate 101, the baffle body 102 is additionally arranged between the fixed plate 101 and the pump shaft 7, and the baffle body 102 is connected with the fixed plate 101. The baffle body 102 separates the low-pressure area 3 formed by the rotation of the shaft coupling 4 from the oil seal structure 10 located between the bearing box 5 and the pump shaft 7, avoiding the situation that the pressure difference formed on both sides of the oil seal structure 10 due to the generation of the low-pressure area 3 causes the lubricating oil in the bearing box 5 to be sucked out through the gap on the oil seal structure 10, thereby achieving the effect of preventing lubricating oil leakage.

[0074] Embodiment II

[0075] The utility model provides a kind of coupling, and the baffle 1 in the oil leakage prevention structure for the pump described above is arranged to the side of bearing box 5.

[0076] In an optional embodiment of the utility model, Figures 1 to 7As shown, the outer side of the coupling 4 is covered with a cylindrical coupling cover 2. One end of the coupling cover 2 is open or closed, and the other end of the coupling cover 2 is connected to the fixing plate 101 in the oil leakage prevention structure for the pump.

[0077] Among them, such as Figure 1 As shown, the coupling cover 2 has a cylindrical structure, with one end open (i.e., suspended), and the other end connected to the fixing plate 101. Compared with the traditional fully enclosed coupling cover, the coupling cover 2 in this embodiment can be formed by thin-walled plate or by welding sheet metal parts, resulting in lighter weight, lower price, and the aforementioned advantages of easy disassembly and adjustment. In this embodiment, the outer diameter of the fixing plate 101 can be designed according to the outer diameter of the coupling 4, ensuring a distance of at least 35mm between the inner wall of the coupling cover 2 and the outer wall of the coupling 4 to improve airflow within the coupling cover 2 and ensure effective heat dissipation.

[0078] In another optional embodiment of this utility model, such as Figure 7 As shown, the coupling cover 2 has a cylindrical structure, with one end sealed and the other end connected to the fixing plate 101. This coupling cover 2 is a fully enclosed structure. During installation, a sealing groove needs to be pre-cut along the circumference of the outer edge of the fixing plate 101. A sealing ring 11 is installed within the sealing groove, and the sealing ring 11 is pressed tightly against the inner wall of the sealing groove to achieve a sealing fit between the coupling cover 2 and the fixing plate 101. At this point, additional fixing of the coupling cover 2 is required. This can be done by installing the coupling cover 2 on drive equipment (such as a motor, turbine, or gearbox), or on a utility equipment base or on a user's site foundation. The specific additional fixing method and location for the coupling cover 2 are not limited here. In this embodiment, the coupling cover 2 is a fully enclosed coupling cover. Therefore, it is necessary to ensure that there is at least a 70mm distance between the inner wall of the coupling cover 2 and the outer wall of the coupling 4, and to install a breathing plug on the coupling cover 2 to ensure effective heat dissipation.

[0079] In another optional embodiment of this utility model, such as Figure 8As shown, the outer side cover of the coupling 4 is provided with a cylindrical coupling cover 2, one end of the coupling cover 2 is connected with a driving device (not shown in the figure), and the other end of the coupling cover 2 is matched with the gap between the baffle 1 in the oil leakage prevention structure for the pump. Wherein, the outer diameter of the baffle 1 is greater than the outer diameter of the coupling cover 2, the baffle 1 is not connected with the coupling cover 2, and there is a certain gap between the two, and the coupling cover 2 is fixed on other driving devices. It is just because the outer diameter of the baffle 1 is greater than the outer diameter of the coupling cover 2 located on the outer side of the coupling 4, so that the low pressure area 3 formed by the rotation of the coupling 4 is completely separated from the oil seal structure 10, and the influence of the low pressure area 3 on the oil seal structure 10 is truly avoided to cause the leakage of lubricating oil.

[0080] In the above embodiment, the coupling cover 2 can be but not limited to a cylindrical structure cover, and a foot type cover can also be used, and the foot of the cover is fixed on the equipment base.

[0081] The coupling of the utility model has the characteristics and advantages of the above-mentioned oil leakage prevention structure for the pump, which will not be repeated here.

[0082] Embodiment three

[0083] The utility model provides a kind of pump, and the pump has the above-mentioned oil leakage prevention structure for the pump.

[0084] The pump of the utility model has the characteristics and advantages of the above-mentioned oil leakage prevention structure for the pump, which will not be repeated here.

[0085] It should be noted that in the description of the present application, the terms "first", "second" and the like are only for the purpose of description and distinguishing similar objects, and there is no sequence between them, and it cannot be understood as indicating or implying relative importance.In addition, in the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0086] The above various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0087] The above is only several embodiments of the utility model, although the embodiments disclosed by the utility model are as above, but the content is only for the purpose of understanding the utility model and the adopted embodiment, not for limiting the utility model.Anyone skilled in the art, without departing from the concept and principle of the utility model, makes equivalent changes and modifications, which should belong to the protection scope of the utility model.

Claims

1. An oil leakage preventing structure for a pump, characterized by comprising: The oil leakage prevention structure for the pump comprises a baffle ringed on the outer periphery of the pump shaft, and the baffle is located between the shaft coupling and the bearing box through which the pump shaft passes in the axial direction of the pump shaft, so as to separate the low pressure area formed by the rotation of the shaft coupling from the oil seal structure located between the bearing box and the pump shaft. An air passage is formed between the baffle and the bearing box, and the baffle has a first area between the bearing box and the oil seal structure. The baffle comprises a fixed plate and a baffle body, the fixed plate is ringed on the outer periphery of the pump shaft, and the two opposite plate surfaces of the fixed plate are connected with the shaft coupling cover sleeved on the outer side of the shaft coupling and the bearing box respectively, and the air passage is located on the plate surface of the fixed plate towards the bearing box; the baffle body is ringed on the outer periphery of the pump shaft and connected with the fixed plate, and the baffle body is located between the fixed plate and the pump shaft in the radial direction of the pump shaft. The air passage is a flow guide groove opened on the plate surface of the fixed plate towards the bearing box, and the two ends of the flow guide groove are connected with the first area and the outside respectively, so as to balance the pressure on both sides of the oil seal structure.

2. The oil leakage preventing structure for a pump according to claim 1, characterized by The flow guide groove extends along the radial direction of the fixed plate. And / or, the number of the flow guide grooves is multiple, and the multiple flow guide grooves are arranged in the circumferential direction of the fixed plate.

3. The oil leakage preventing structure for a pump according to claim 1, wherein The plate surface of the fixed plate towards the bearing box has an annular positioning boss, so as to form a radial positioning groove on the plate surface of the fixed plate, and the end of the bearing box is located in the radial positioning groove and abuts against the inner wall of the positioning boss.

4. The oil leakage preventing structure for a pump according to claim 1, characterized in that, The fixed plate comprises multiple fixed plate splicing parts, and the multiple fixed plate splicing parts are spliced to form the fixed plate. And / or, the baffle body comprises multiple baffle splicing parts, and the multiple baffle splicing parts are spliced to form the baffle body.

5. The oil leakage preventing structure for a pump according to claim 1, wherein The outer edge of the fixed plate is provided with a sealing groove in the circumferential direction thereof, and a sealing ring is arranged in the sealing groove and is tightly sealed between the shaft coupling cover and the inner wall of the sealing groove.

6. A coupling, characterized by The shaft coupling is provided with the baffle in the oil leakage prevention structure for the pump according to any one of claims 1 to 5 towards the bearing box.

7. The coupling of claim 6 wherein, The outer side of the shaft coupling is provided with a shaft coupling cover, one end of the shaft coupling cover is open or closed, and the other end of the shaft coupling cover is connected with the fixed plate in the oil leakage prevention structure for the pump.

8. The coupling of claim 6 wherein, The outer side of the shaft coupling is provided with a shaft coupling cover, one end of the shaft coupling cover is connected with the driving device, and the other end of the shaft coupling cover is gap-fitted with the baffle in the oil leakage prevention structure for the pump.

9. A pump characterized by The pump has the oil leakage prevention structure for the pump according to any one of claims 1 to 5.

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