Oil discharger of centrifugal compressor and centrifugal compressor

Abstract

According to the oil discharger of the centrifugal compressor and the centrifugal compressor, oil stains thrown out are blocked by an oil blocking piece in an inner cavity close to an oil smoke exhaust port when a unit operates, and cannot be discharged out of the inner cavity from the oil smoke exhaust port, so that oil splashing at the oil smoke exhaust port is reduced. According to the main technical scheme, the oil drain device of the centrifugal compressor comprises an oil drain device body, the oil drain device body comprises an inner cavity, an oil smoke exhaust port and a lubricating oil return port, and the oil smoke exhaust port and the lubricating oil return port are both communicated with the inner cavity; and the oil baffle piece is arranged in the inner cavity and close to the oil smoke exhaust port, and the oil baffle piece is used for preventing at least part of the lubricating oil from being discharged out of the inner cavity from the oil smoke exhaust port. The oil drainage device is mainly used for oil drainage.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field especially centrifugal compressor's oil drain and centrifugal compressor. BACKGROUND

[0002] In recent years, with the continuous development of industrial technology, centrifugal compressor unit gradually becomes the core equipment of modern industry. Centrifugal compressor is mainly composed of casing, impeller, rotating shaft and many bearings, the impeller is connected on the rotating shaft, the rotating shaft is connected to the casing through the bearing, the impeller is driven to rotate by the rotating shaft, and the air is pushed outwards to realize air compression by the action of the casing internal flow passage. In order to make the rotating shaft rotate smoothly, reduce friction and heat generation, and provide oil seal, it is usually necessary to provide lubricating oil to the unit, especially to the bearing. The bearing, shaft seal and rotating shaft cannot guarantee no leakage. When the rotating shaft is running at high speed, the lubricating oil in the oil system will leak into the unit circulation system. Therefore, the unit of centrifugal compressor is usually provided with an oil drain on both sides of the rotating shaft.

[0003] The main functions of the oil drain of the centrifugal compressor include collecting lubricating oil, discharging oil fume, arranging cable lead wire, etc., and contain an oil return port, an oil fume discharge port and a lead wire port. When the unit is running on site, due to the large speed of oil droplet ejection, the oil drain often has problems such as leakage at the joint surface, oil splashing at the oil fume discharge port, etc. SUMMARY

[0004] Therefore, in order to solve at least one of the above technical problems, the utility model provides an oil drain of a centrifugal compressor and a centrifugal compressor.

[0005] In order to achieve the above purpose, the utility model mainly provides the following technical scheme:

[0006] On the one hand, the utility model provides an oil drain of a centrifugal compressor, which comprises:

[0007] The oil drain body (100) comprises an inner cavity (110), an oil fume discharge port (120) and a lubricating oil return port (130), and the oil fume discharge port (120) and the lubricating oil return port (130) are in communication with the inner cavity (110);

[0008] The oil drain body (100) comprises an inner cavity (110), an oil fume discharge port (120) and a lubricating oil return port (130), and the oil fume discharge port (120) and the lubricating oil return port (130) are in communication with the inner cavity (110);

[0009] The oil drain body (100) comprises an inner cavity (110), an oil fume discharge port (120) and a lubricating oil return port (130), and the oil fume discharge port (120) and the lubricating oil return port (130) are in communication with the inner cavity (110);

[0010] The projection of the oil fume exhaust port (120) is entirely located within the projection of the oil blocking piece (200) in the axial direction of the oil fume exhaust port (120).

[0011] The two sides of the oil blocking piece (200) in the length direction are connected with the inner wall of the inner cavity (110), and the two sides of the oil blocking piece (200) in the width direction are connected with the inner wall of the inner cavity (110) to provide a passage for the oil fume.

[0012] The extension amount of the oil blocking piece (200) in the length direction is greater than the extension amount in the width direction.

[0013] The distance between the oil blocking piece (200) and the oil fume exhaust port (120) is a preset distance, which is greater than or equal to 0.05 times the maximum inner diameter of the inner cavity (110) and less than or equal to 0.25 times the maximum inner diameter of the inner cavity (110).

[0014] The oil discharger further comprises:

[0015] The oil return weir plate (300) is located in the inner cavity (110), and the oil return weir plate (300) is located on the rear side of the lubricating oil return port (130) in the rotation direction of the rotating shaft of the centrifugal compressor.

[0016] The first end of the oil return weir plate (300) is connected with the inner wall of the inner cavity (110), and the second end of the oil return weir plate (300) extends in a direction away from the lubricating oil return port (130) and close to the extension line of the axis of the lubricating oil return port (130).

[0017] The projection of the second end of the oil return weir plate (300) in the axial direction of the lubricating oil return port (130) does not cover the center of the lubricating oil return port (130).

[0018] The oil discharger body (100) further comprises a plurality of probe interfaces, and the probe interfaces are in communication with the inner cavity (110).

[0019] The probe interfaces are arranged on different sides of the oil discharger body (100).

[0020] The axis of the probe interface is inclined upward in a direction away from the inner cavity (110).

[0021] The oil discharger body (100) further comprises a sealing groove (150) located on the end face of the oil discharger body (100), and the sealing groove (150) is used for embedding a sealing member.

[0022] In another aspect, the utility model also provides a centrifugal compressor, including the oil discharger of any one of the centrifugal compressors above and the centrifugal compressor body, and the oil discharger of the centrifugal compressor is located on one side or both sides of the centrifugal compressor body in the axial direction.

[0023] The centrifugal compressor oil drainer and centrifugal compressor proposed in this utility model mainly utilize an oil-blocking component near the exhaust port in the inner cavity. During unit operation, the oil splashed out is blocked by the oil-blocking component, preventing it from being discharged outside the inner cavity through the exhaust port, thereby reducing the problem of oil splashing at the exhaust port. Furthermore, due to the gap between the oil-blocking component and the inner wall of the cavity, oil fumes can smoothly bypass the oil-blocking component under pressure and be discharged through the exhaust port. In addition, the oil-blocking component also acts as a buffer for oil fumes. Before the oil fumes pass through the exhaust port, some of them collide with the oil-blocking component, causing some oil to accumulate there. The accumulated oil will naturally drip off and be discharged through the lubricating oil return port, reducing the viscosity of the oil fumes discharged from the exhaust port and increasing the lubricating oil recovery efficiency. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of an oil drainer for a centrifugal compressor provided in an embodiment of the present invention from a first-view perspective;

[0025] Figure 2 for Figure 1 A partially enlarged schematic diagram of the oil drainer of the centrifugal compressor shown in region A;

[0026] Figure 3 This is a schematic diagram of the oil drainer of a centrifugal compressor provided in an embodiment of the present invention from a second perspective. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of an oil drainer for a centrifugal compressor proposed according to this utility model.

[0028] like Figures 1-3 As shown, this utility model embodiment provides an oil drainer for a centrifugal compressor, comprising:

[0029] The oil drainer body (100) includes an inner cavity (110), an oil exhaust port (120), and a lubricating oil return port (130), both of which are connected to the inner cavity (110).

[0030] An oil baffle (200) is provided in the inner cavity (110) near the oil exhaust port (120). The oil baffle (200) is used to prevent at least part of the lubricating oil from being discharged from the oil exhaust port (120) to the outside of the inner cavity (110).

[0031] The oil drain is used in a centrifugal compressor, which mainly comprises a casing, a rotor assembly composed of a rotating shaft connected with an impeller, and a bearing, the rotor assembly being connected to the casing through the bearing. The bearing can be further divided into a thrust bearing located at one axial side and a support bearing located at the other axial side, and the rotating shaft at one side of the support bearing is further connected with a coupling. The oil drain can be arranged at both axial ends of the casing, and the end of the rotor assembly can partially extend into the inner cavity (110) of the oil drain, or the oil drain is located outside both ends of the rotor assembly.

[0032] The oil drain body (100) is approximately a cylindrical structure, and the oil drain body (100) comprises an axis, which can be understood as a virtual line used for convenience of description. In use, the axis of the oil drain body (100) coincides with the axis of the rotating shaft. The oil drain body (100) can be connected with the casing, and the side of the oil drain body (100) away from the casing can be closed or at least partially closed, such as the oil drain body (100) at the side of the thrust bearing, the end away from the casing can be closed. Alternatively, the side of the oil drain body (100) away from the casing can be completely open, such as the oil drain body (100) at the side of the coupling, the end away from the casing can be open, thereby leaving space for the coupling connected to the power end.

[0033] The oil smoke outlet (120) and the lubricating oil return outlet (130) can be arranged at the top and bottom ends, or the two ends in the vertical direction, of the oil drain body (100), respectively. The oil smoke outlet (120) is connected with an oil smoke pipe, and the discharge end of the oil smoke pipe is provided with a flange or an oil mist separator according to requirements. The oil blocking piece (200) is located in the inner cavity (110) and connected with the inner wall of the inner cavity (110). The oil blocking piece (200) can be located directly below the oil smoke outlet (120) and at a distance from the oil smoke outlet (120). The height of the oil blocking piece (200) will not be lower than the axis of the oil drain body (100). The oil blocking piece (200) is not connected with the inner wall of the inner cavity (110) at all edges, but only at part of the edges, and the other part of the edges forms a passage for the oil smoke to pass through, thereby playing the role of blocking oil droplets while passing through the oil smoke.

[0034] When the rotor assembly rotates at high speed, oil droplets and oil fume are leaked from the joint position of the bearing and the rotor assembly and the casing, and are irregularly scattered, gushed and splashed outward under the driving of high-speed rotation. Part of the oil droplets will be thrown to the inner wall of the inner cavity (110), and after naturally sliding, they are discharged to the recovery system through the lubricating oil return port (130). Part of the oil droplets will be thrown upward, or be wrapped by the oil fume and move to the oil fume discharge port (120), or be scattered upward. Before the oil droplets enter the oil fume discharge port (120), they will be blocked by the oil blocking piece (200) located below the oil fume discharge port (120), and then the oil droplets are prevented from being directly discharged from the oil fume discharge port (120). On the one hand, the oil droplets are prevented from splashing out; on the other hand, the oil droplets are prevented from accumulating on the oil fume discharge port (120) and the oil fume discharge pipe, so as to ensure the smoothness of the oil fume flow path and prevent the oil fume flow path from being blocked.

[0035] The oil discharger and the centrifugal compressor provided by the utility model mainly block the oil stains thrown out by the oil blocking piece close to the oil fume discharge port in the inner cavity, so that the oil stains will not be discharged from the oil fume discharge port to the outside of the inner cavity, thereby reducing the problem of oil splashing at the oil fume discharge port, and the oil fume can smoothly bypass the oil blocking piece under pressure and be discharged through the oil fume discharge port. In addition, the oil blocking piece also has a buffering effect on the oil fume, part of the oil fume will impact on the oil blocking piece before passing through the oil fume discharge port, so that part of the oil fume is accumulated on the oil blocking piece, and the accumulated oil fume will naturally drop and be discharged through the lubricating oil return port, thereby reducing the viscosity of the oil fume discharged from the oil fume discharge port and increasing the recovery efficiency of the lubricating oil.

[0036] The oil blocking piece (200) can be various structures, which are designed to better block the oil droplets and ensure that the oil fume can pass through. For example, the oil blocking piece (200) can be a plate structure or an irregular shape. The oil blocking piece (200) can be a solid structure or a filter screen.

[0037] In one embodiment, the oil blocking piece (200) includes a top surface opposite the oil fume discharge port (120), and the top surface is perpendicular to the axis direction of the oil fume discharge port (120). In the axis direction of the oil fume discharge port (120), the projection of the oil fume discharge port (120) is entirely located in the projection of the oil blocking piece (200).

[0038] In use, the top surface is horizontally arranged, and the axis of the oil fume discharge port (120) extends in the vertical direction, thereby achieving a better blocking effect. The vertical projection of the oil fume discharge port (120) is entirely located on the top surface, thereby realizing the full shielding of the oil fume discharge port (120) in the vertical direction by the oil blocking piece (200), and avoiding the vertically upward oil droplets from directly entering the oil fume discharge port (120).

[0039] In one embodiment, two sides of the length direction of the oil blocking piece (200) are connected with the inner wall of the inner cavity (110), and the two sides of the width direction of the oil blocking piece (200) are connected with the inner wall of the inner cavity (110) to provide a passage for the oil fume. The extension amount of the oil blocking piece (200) in the length direction is greater than the extension amount of the oil blocking piece (200) in the width direction.

[0040] The length direction of the oil blocking piece (200) is perpendicular to the axial direction of the oil discharger body (100), and the width direction of the oil blocking piece (200) is parallel to the axial direction of the oil discharger body (100). The width direction of the oil blocking piece (200) is smaller, and the edge of the width direction of the oil blocking piece (200) and the inner wall of the inner cavity (110) form an approximately semicircular passage, so that the oil fume can pass through the oil smoke outlet (120) more smoothly by bypassing the two sides of the width direction of the oil blocking piece (200). The width of the oil blocking piece (200) can be 1.5 to 2 times the inner diameter of the oil smoke outlet (120), so as to balance the effects of better blocking oil droplets and allowing oil fume to pass through.

[0041] In one embodiment, the oil blocking piece (200) further includes a bottom surface opposite the oil smoke outlet (120), and the bottom surface can be a plane, that is, the oil blocking piece (200) can be a flat plate structure.

[0042] Alternatively, the bottom surface includes a first guide surface and a second guide surface, the first guide surface and the second guide surface are respectively formed by the two sides of the width direction of the oil blocking piece (200), and extend away from the oil smoke outlet (120) while moving towards each other, that is, the oil blocking piece (200) can be a triangular pyramid structure. Through the first guide surface and the second guide surface, on the one hand, the oil fume is guided to move to the two sides of the width direction of the oil blocking piece (200), which helps the oil fume to pass through the oil smoke outlet (120) quickly; on the other hand, the oil droplets hitting the first guide surface and the second guide surface will converge in the middle under the guide action and are more likely to fall off from the first guide surface and the second guide surface, thereby reducing the accumulation of oil.

[0043] In one embodiment, the distance between the oil blocking piece (200) and the oil smoke outlet (120) is a preset distance, and the preset distance is greater than or equal to 0.05 times the maximum inner diameter of the inner cavity (110), so as to avoid the problem that the distance between the oil blocking piece (200) and the oil smoke outlet (120) is too close, the passage area between the two sides of the width direction of the oil blocking piece (200) and the inner wall of the inner cavity (110) is too small, and the oil fume cannot be discharged smoothly. The preset distance is less than or equal to 0.25 times the maximum inner diameter of the inner cavity (110), so as to provide space for the coupling and other components on the one hand, and avoid the problem that the distance between the oil blocking piece (200) and the oil smoke outlet (120) is too large, and the oil droplets will directly splash from above the oil blocking piece (200) to the oil smoke outlet (120) on the other hand.

[0044] In an embodiment, the oil separator further comprises: an oil return weir plate (300), the oil return weir plate (300) is located in the inner cavity (110), and the oil return weir plate (300) is located at the rear side of the lubricating oil return port (130) in the rotation direction of the rotating shaft of the centrifugal compressor.

[0045] As shown by the arrow, it is the rotation direction of the rotor assembly or the rotating shaft. When the unit is working, the oil droplets will be accumulated at the bottom of the inner cavity (110). When the unit rotates at high speed, the generated airflow will drive the accumulated lubricating oil to rotate, and the oil return weir plate (300) can block the lubricating oil from being lifted by the airflow, so that the lubricating oil can flow smoothly to the lubricating oil return port (130). Figure 3

[0046] In some embodiments, a plurality of hollows can be arranged near the inner wall of the inner cavity (110) of the oil return weir plate (300), and the hollows are used for discharging the accumulated lubricating oil on the side of the oil return weir plate (300) away from the lubricating oil return port (130). It can be understood that, since the lubricating oil moves to the lubricating oil return port (130) through the hollows, and the oil return weir plate (300) blocks most of the airflow, almost no lubricating oil is moved in the opposite direction through the hollows by the airflow.

[0047] In an embodiment, the first end of the oil return weir plate (300) is connected with the inner wall of the inner cavity (110), and the second end of the oil return weir plate (300) extends in a direction away from the lubricating oil return port (130) and close to the extension line of the axis of the lubricating oil return port (130).

[0048] That is, the oil return weir plate (300) extends upward and in the direction of the axis of the lubricating oil return port (130) at the same time, thereby guiding the lubricating oil lifted by the airflow downward and to the side of the lubricating oil return port (130), so that the lubricating oil is more easily flowed to the lubricating oil return port (130).

[0049] In an embodiment, the projection of the second end of the oil return weir plate (300) in the direction of the axis of the lubricating oil return port (130) does not cover the center of the lubricating oil return port (130).

[0050] That is, the oil return weir plate (300) only corresponds to a small part of the lubricating oil return port (130) in the vertical direction, and does not correspond to the central region, thereby enabling most of the oil droplets to directly drop to the lubricating oil return port (130). The amount of lubricating oil dropped on the oil return weir plate (300) is reduced.

[0051] In an embodiment, the oil separator body (100) further comprises a plurality of probe interfaces, and the probe interfaces are in communication with the inner cavity (110). The probe interfaces are arranged on different sides of the oil separator body (100).

[0052] ​The probe interfaces are multiple, at least including an upper probe interface (141) corresponding to the area above the axis of the oil drain body (100) and a lower probe interface (142) corresponding to the area below the axis of the oil drain body (100). The specific types of the upper probe interface (141) and the lower probe interface (142) can be set according to the actual positions of the probes. For example, the upper probe interface (141) can be a compressor vibration measurement probe interface, and the compressor vibration measurement probe is used to monitor the vibration of the compressor rotating shaft to ensure the stable operation of the unit. The lower probe interface (142) can be an interface for lead wires such as temperature measurement devices and displacement measurement devices. More specifically, the upper probe interface (141) is two, which are arranged on the two sides of the circumference of the oil drain port (120). The lower probe interface (142) is six, which are arranged in three groups. Two groups of lower probe interfaces (142) are arranged on the two sides of the circumference of the lubricating oil return port (130). The three lower probe interfaces (142) in the same group are arranged in parallel to the axis direction of the oil drain body (100). Through the dispersed arrangement of the probe interfaces, the problems of inconvenient installation and easy wear caused by too long lead wires are avoided.

[0053] In an embodiment, the axis of the probe interface is inclined upward in the direction away from the inner cavity (110). In this way, the risk of the lubricating oil flowing out through the probe interface is reduced.

[0054] In an embodiment, the oil drain body (100) further comprises a sealing groove (150) located on the end face of the oil drain body (100), and a sealing element is embedded in the sealing groove (150).

[0055] The oil drain body (100) further comprises a cylinder (101) and a connecting disc (102) connected to the cylinder (101) and extending to the radial outside of the cylinder (101). The oil drain body (100) is connected to the shell of the centrifugal compressor through the connecting disc (102). The sealing groove (150) is arranged on the end face where the connecting disc (102) is connected to the shell of the centrifugal compressor and surrounds the cylinder (101) for one turn. A sealing element such as a rubber ring or a rubber rope is embedded in the sealing groove (150). In this way, the rubber ring can be squeezed by the shell and the sealing groove (150) to realize oil-tight sealing at the end face.

[0056] On the other hand, the utility model also provides a centrifugal compressor, which comprises the oil drain of any one of the above-mentioned centrifugal compressors and a centrifugal compressor body. The centrifugal compressor body comprises the above-mentioned shell, rotor assembly and bearing. The oil drain of the centrifugal compressor is located on one side or both sides of the centrifugal compressor body in the axial direction, for example, it can be arranged on one side of the thrust bearing or the coupling, or it can be arranged on both sides. The centrifugal compressor comprises the oil drain of any one of the above-mentioned centrifugal compressors, which has the advantages of the oil drain of any one of the above-mentioned centrifugal compressors, and details are not repeated here.

[0057] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil drainer for a centrifugal compressor, characterized in that, include: The oil drainer body (100) includes an inner cavity (110), an oil exhaust port (120), and a lubricating oil return port (130), wherein the oil exhaust port (120) and the lubricating oil return port (130) are both connected to the inner cavity (110); An oil baffle (200) is disposed in the inner cavity (110) near the exhaust port (120). The oil baffle (200) is used to block at least part of the lubricating oil from being discharged from the exhaust port (120) to the outside of the inner cavity (110).

2. The oil drainer of the centrifugal compressor according to claim 1, characterized in that, The oil baffle (200) includes a top surface relative to the exhaust port (120), the top surface being perpendicular to the axial direction of the exhaust port (120); Along the axial direction of the exhaust port (120), the projection of the exhaust port (120) is entirely within the projection of the oil baffle (200).

3. The oil drainer of the centrifugal compressor according to claim 1, characterized in that, The oil baffle (200) is connected to the inner wall of the inner cavity (110) on both sides in the length direction, and the oil fume is allowed to pass between the oil baffle (200) and the inner wall of the inner cavity (110) on both sides in the width direction. The oil baffle (200) extends more in the length direction than it extends in the width direction.

4. The oil drainer of the centrifugal compressor according to claim 1, characterized in that, The distance between the oil baffle (200) and the oil exhaust port (120) is a preset distance, which is greater than or equal to 0.05 times the maximum inner diameter of the inner cavity (110) and less than or equal to 0.25 times the maximum inner diameter of the inner cavity (110).

5. The oil drainer of the centrifugal compressor according to claim 1, characterized in that, The oil drainer also includes: The oil return weir plate (300) is located in the inner cavity (110) and the oil return weir plate (300) is located on the rear side of the lubricating oil return port (130) in the rotation direction of the centrifugal compressor shaft.

6. The oil drainer of the centrifugal compressor according to claim 5, characterized in that, The first end of the return oil weir plate (300) is connected to the inner wall of the inner cavity (110), and the second end of the return oil weir plate (300) extends in the direction of the extension line of the axis away from the lubricating oil return port (130) and close to the lubricating oil return port (130). The projection of the second end of the return oil weir plate (300) onto the axial direction of the lubricating oil return port (130) does not cover the center of the lubricating oil return port (130).

7. The oil drainer of the centrifugal compressor according to claim 1, characterized in that, The oil drainer body (100) also includes multiple probe interfaces, which are connected to the inner cavity (110); The probe interfaces are located on different sides of the oil drainer body (100).

8. The oil drainer of the centrifugal compressor according to claim 7, characterized in that, The axis of the probe interface is inclined upward in a direction away from the inner cavity (110).

9. The oil drainer of the centrifugal compressor according to claim 1, characterized in that, The oil drainer body (100) also includes a sealing groove (150), which is located on the end face of the oil drainer body (100) and is used to embed a seal.

10. A centrifugal compressor, characterized in that, The invention includes an oil drainer for a centrifugal compressor as described in any one of claims 1-9, and a centrifugal compressor body, wherein the oil drainer for the centrifugal compressor is located on one or both sides of the centrifugal compressor body along its axial direction.

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